A pressure reducing valve capable of automatically adjusting pressure and a pressure regulating method thereof

Abstract

The present invention relates to a pressure reducing valve capable of automatically adjusting pressure and a pressure regulating method thereof. The middle parts of both sides of the outer wall of a passage pipe are connected to an isolation block, the outer side of the isolation block is connected to the inner wall of a valve body, and the bottom of the isolation block and the bottom of the passage pipe are on the same horizontal plane; the bottom of an upper spring is fixedly connected to the top of a lower pressure plate, a control box mounted on the outer side of a stepping motor is arranged on the top of a pressure regulating shell, a controller and a pressure receiver are arranged in the control box, and a touch display connected to the controller is arranged on the top of the control box; the pressure reducing valve is ensured to meet the rebound sheet balancing operation and the increase or decrease operation of the liquid inlet channel when different liquid inlet pressures change during use, and the liquid outlet pressure of the pressure reducing valve is adaptively adjusted in real time.

Description

Technical Field

[0001] The present invention relates to the intelligent manufacturing equipment industry, and in particular to a pressure reducing valve capable of automatically adjusting pressure and a pressure adjusting method thereof. Background Art

[0002] The pressure reducing valve is a valve that reduces the inlet pressure to a certain required outlet pressure through regulation, and automatically maintains a stable outlet pressure by relying on the energy of the medium itself. From the perspective of fluid mechanics, the pressure reducing valve is a throttling element with variable local resistance, that is, by changing the throttling area, the flow rate and the kinetic energy of the fluid are changed, resulting in different pressure losses, thereby achieving the purpose of reducing pressure. Then, by relying on the regulation of the control and regulation system, the fluctuation of the pressure behind the valve is balanced with the spring force, so that the pressure behind the valve remains constant within a certain error range.

[0003] Traditional pressure reducing valves have certain defects during use: First, traditional pressure reducing valves need to pre-set the pressure range value during use, and the pressure reducing range of the pressure reducing valve is preset through a manual adjustment device. During use, the fluctuation and balance operation within the preset pressure range is achieved through the fluid's own pressure, and the pressure reduction operation at the outlet is finally achieved. However, it is found in the actual use process that the traditional pressure reducing valve loses its adjustment advantage when dealing with changes in the inlet pressure, and it is often necessary to adjust the preset pressure range again according to the display of the pressure gauge. When dealing with unstable inlet pressure liquid output operations, the traditional pressure reducing valve needs to be adjusted many times, and manual observation and real-time attention are required. Once adjusted, it is easy to cause the pressure reducing valve to stop working; secondly, the traditional return The overall service life of the rebound piece of the shrapnel type pressure reducing valve is relatively low during use. It is indeed a corresponding protection system. When the inlet pressure is too large and exceeds the preset pressure range, it is easy to cause the rebound piece to fail and be damaged. The preset pressure adjustment operation cannot be responded to in time, which can easily reduce the service life of the rebound piece; thirdly, the overall setting structure of the traditional pressure reducing valve is complex, and the replacement and maintenance of internal components are relatively troublesome. When the pressure reducing valve fails, some components cannot be replaced, resulting in the abandonment of the entire valve and a waste of resources; in addition, the traditional pressure reducing valve relies on the method of manual adjustment, which also causes a decrease in work and operation efficiency. More importantly, during use, the traditional pressure reducing valve cannot realize automatic pressure range adjustment according to changes in the inlet pressure, resulting in a high incidence of valve failures.

[0004] To sum up, a pressure reducing valve and a pressure regulating method for automatically adjusting the pressure are provided, which have the advantages of simple structure, convenient operation, high working and operating efficiency, precise control, automatic adjustment of the pressure range value, long service life, convenient repair and overhaul, and can realize rapid emergency adjustment of the preset pressure range according to the inlet pressure, and at the same time implement overpressure protection for the overall valve, thereby increasing the service life of the equipment and reducing the risk of damage and failure. The method is simple and easy to operate, and has broad market prospects. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a pressure reducing valve and a pressure regulating method for automatically adjusting the pressure, which have the advantages of simple structure, convenient operation, high working and operating efficiency, precise control, the ability to automatically adjust the pressure range, long service life, and convenient repair and overhaul. The valve can realize rapid emergency adjustment of the preset pressure range according to the inlet pressure, and at the same time implement overpressure protection for the entire valve, thereby increasing the service life of the equipment and reducing the risk of damage and failure. The method is simple and easy to operate, and the pressure reducing valve and a pressure regulating method for automatically adjusting the pressure are used to overcome the deficiencies in the prior art.

[0006] The technical solution of the present invention is implemented as follows: a pressure reducing valve for automatically regulating pressure comprises a valve body, a liquid inlet and a liquid outlet respectively arranged on both sides of the valve body, a pressure sensing shell fixedly installed on the top of the valve body, a pressure regulating shell fixedly installed above the pressure sensing shell, a rebound sheet fixedly installed between the pressure regulating shell and the pressure sensing shell, and a channel opening and closing shell installed at the bottom of the valve body, a passage tube whose top is fixedly installed in the inner cavity of the valve body between the liquid inlet and the liquid outlet and is fixedly connected to the top surface of the middle part of the inner wall of the valve body as an integral structure with the top, a liquid inlet channel is arranged between the bottom of the passage tube on the side facing the liquid inlet and the bottom wall of the valve body, the middle parts of both sides of the outer wall of the passage tube are connected to the isolation block, the outer side of the isolation block is connected to the inner wall of the valve body, and the bottom of the isolation block and the bottom of the passage tube are on the same horizontal plane;

[0007] The inner cavity of the passage pipe is provided with a liquid inlet cavity connected with the liquid inlet channel, a pressure sensing liquid outlet pipe connected with the liquid inlet cavity is fixedly installed at the longitudinal middle position of the passage pipe facing the liquid outlet, the upper part of the pressure sensing liquid outlet pipe is connected with the inner wall of the top of the valve body through the reinforcing connection and blocking block, the lower part of the pressure sensing liquid outlet pipe is connected with the inner wall of the bottom of the valve body through the bottom blocking and blocking partition, and a pressure reducing liquid outlet cavity connected with the liquid outlet is provided inside the pressure sensing liquid outlet pipe;

[0008] A maintenance and inspection plugging head is installed at the bottom of the channel opening and closing shell through a threaded connection, and a bottom spring connecting block is fixedly installed on the inner top of the maintenance and inspection plugging head. An elastic lifting and closing plugging sleeve that matches the bottom of the passage pipe is movably installed in the inner cavity of the channel opening and closing shell, and a bottom spring is installed between the inner cavity of the elastic lifting and closing plugging sleeve and the outer wall of the bottom spring connecting block. A lifting rod is fixedly installed on the top of the elastic lifting and closing plugging sleeve, and the middle part of the lifting rod is located at the longitudinal center position of the liquid inlet cavity. After the top of the lifting rod passes through the top center position of the valve body, it matches with the automatic pressure regulating device arranged on the inner side and upper part of the pressure sensing shell and the pressure regulating shell. A pressure balancing connecting pipe whose bottom is connected to the pressure reducing liquid outlet cavity is longitudinally installed in the reinforced connecting plugging block, and the top of the pressure balancing connecting pipe matches with the automatic pressure regulating device.

[0009] The automatic pressure regulating device comprises a pressure sensing chamber arranged in a pressure sensing shell, the pressure sensing chamber is connected with the top of the pressure balance connecting pipe, the top of the lifting rod is located at the longitudinal center of the pressure sensing chamber, the pressure sensing chamber is located below the rebound sheet, a lifting receiving block matched with the top of the lifting rod is fixedly installed at the bottom center of the rebound sheet, a sliding limit channel is arranged in the pressure regulating shell above the rebound sheet, a screw connected with the output end of the stepping motor on the outer side of the top of the pressure regulating shell is installed in the sliding limit channel, and a limit sleeve on the outer side of the screw is installed on the sliding limit A sliding nut in the inner cavity of the channel, the bottom of the sliding limit channel is fixedly connected to the upper pressure plate through a sliding connecting rod, a pressure receiving plate is fixedly installed below the upper pressure plate, a deformation pressure sensor is installed at the bottom center of the pressure receiving plate, an upper spring is arranged on the outside of the deformation pressure sensor below the pressure receiving plate, the bottom of the upper spring is fixedly connected to the top of the lower pressure plate, a control box mounted on the outside of the stepper motor is arranged on the top of the pressure regulating shell, a controller and a pressure receiver are arranged in the control box, and a touch display connected to the controller is arranged on the top of the control box.

[0010] The outer sides of the liquid inlet and the liquid outlet are respectively provided with a liquid inlet connecting sleeve and a liquid outlet connecting sleeve, the inner diameters of the liquid inlet and the liquid outlet are equal, the passage tube is a cylindrical tubular structure with a flat bottom, the liquid inlet channel is an opening structure with an arc-shaped cross-section, the top surface of the liquid inlet channel and the bottom surface of the passage tube are on the same horizontal plane, the isolation block is an arc-shaped block structure, the thickness of the isolation block is equal to the outer diameter of the passage tube, and the bottom surface of the isolation block and the top surface of the liquid inlet channel are on the same horizontal plane.

[0011] The pressure sensing liquid outlet pipe is a cylindrical tubular structure, the outer diameter of the pressure sensing liquid outlet pipe is not larger than the outer diameter of the passage pipe, the passage pipe and the pressure sensing liquid outlet pipe are installed perpendicular to each other, the bottom blocking and plugging baffle is an arc structure mounted on the bottom outer wall of the pressure sensing liquid outlet pipe, the bottom blocking and plugging baffle is an arc structure mounted on the upper outer wall of the pressure sensing liquid outlet pipe, the bottom blocking and plugging baffle and the pressure sensing liquid outlet pipe are an integrated structure, the outer side surfaces of the bottom blocking and plugging baffle and the pressure sensing liquid outlet pipe are circular structures, the outer diameter of the circular structure matches the inner diameter of the liquid outlet, the bottom blocking and plugging baffle and the pressure sensing liquid outlet pipe isolate the liquid outlet from the liquid inlet channel and the liquid inlet cavity.

[0012] The channel opening and closing shell is a cylindrical structure, the outer diameter of the channel opening and closing shell is not larger than the inner diameter of the valve body, the top of the channel opening and closing shell is connected with the middle of the inner cavity of the valve body, the central axis of the channel opening and closing shell and the central axis of the passage pipe are on the same straight line, the inner diameter of the channel opening and closing shell is equal to the outer diameter of the passage pipe, an internal thread groove is provided on the top of the inspection and maintenance plugging head, and an external thread layer matching the internal thread groove is provided at the bottom of the channel opening and closing shell.

[0013] The bottom spring connecting block is a cylindrical structure, the outer diameter of the bottom spring connecting block is not larger than the inner diameter of the elastic lifting and blocking sleeve, the elastic lifting and blocking sleeve is a cylindrical tubular structure with a closed top, the length of the elastic lifting and blocking sleeve is not larger than the length of the channel opening and closing shell, the outer diameter of the elastic lifting and blocking sleeve matches the inner diameter of the channel opening and closing shell, the outer diameter of the elastic lifting and blocking sleeve is equal to the outer diameter of the passage tube, the outer diameter of the bottom spring connecting block is equal to the inner diameter of the bottom spring, and the inner diameter of the elastic lifting and blocking sleeve matches the outer diameter of the bottom spring.

[0014] The lifting rod is a cylindrical structure, the longitudinal center axis of the lifting rod is in the same straight line as the center axis of the elastic lifting sealing sleeve, the channel opening and closing shell and the passage pipe, the length of the lifting rod is not less than the outer diameter of the valve body, and the diameter of the lifting rod is not greater than the diameter of the liquid inlet cavity.

[0015] The pressure sensing shell is a square box body structure, the pressure sensing cavity is a square cavity structure, the width of the pressure sensing shell is not greater than the outer diameter of the valve body, the rebound sheet is a rectangular sheet structure, the length of the rebound sheet is not less than the length of the pressure sensing shell, the two ends of the rebound sheet in the length direction are respectively flush with the two ends of the pressure sensing shell in the length direction, the pressure regulating shell is a rectangular box body structure, the bottom of the pressure regulating shell is provided with a bottom extension body, the length and width of the inner cavity of the pressure regulating shell are respectively equal to the length and width of the pressure sensing cavity, the lifting and lowering receiving block is a cylindrical structure with an arc-shaped groove at the bottom that matches the arc surface of the top of the lifting rod, and the length of the lifting and lowering receiving block is not greater than the depth of the pressure sensing cavity.

[0016] The sliding limit channel is a box structure with a cross-section in the direction. The sliding limit channel is fixedly installed at the center position inside the pressure regulating shell through a sliding limit channel fixing rod. A motor heat dissipation groove is arranged at the center position of the control box. The deformation pressure sensor is connected to the pressure receiver through a wire, and the pressure receiver is connected to the controller through a wire. The controller is connected to the stepper motor through a wire. The bottom of the pressure receiving plate is fixedly connected to the top of the deformation pressure sensor, and the top and bottom of the deformation pressure sensor are both provided with telescopic pressure measuring springs.

[0017] A pressure regulating method for the pressure reducing valve of automatic pressure regulation as described above, the method comprising:

[0018] S1. In the initial state, both sides of the liquid inlet and the liquid outlet are in a closed state, and the bottom spring is in a natural expansion and contraction state. At this time, the top surface of the elastic lifting and blocking sleeve contacts the bottom of the passage tube, and the liquid inlet channel and the liquid inlet cavity are in a closed state. The top of the lifting rod forces the rebound sheet to be bent upward through the lifting receiving block. After the power is turned on, the preset pressure range value is adjusted through the touch display. The controller drives the stepper motor to start, and the stepper motor drives the screw to rotate clockwise. The screw drives the sliding nut to move vertically downward in the sliding limit channel. As the sliding nut moves downward, the sliding connecting rod drives the upper pressure plate, the pressure receiving plate, the upper spring and the lower pressure plate to move downward and contact the rebound sheet. According to the size of the preset pressure range value, the bottom of the lower pressure plate applies pressure to the rebound sheet through the rebound force of the upper spring. At this time, the rebound sheet in the upward bending state moves downward, and the lifting receiving block and the lifting rod are driven downward during the downward movement. When the preset pressure range value is reached, the stepper motor stops rotating. At this time, the bottom of the liquid inlet cavity is opened, and the liquid inlet channel is half-open or fully open according to the preset pressure size.

[0019] S2, open the passage on one side of the liquid inlet, the liquid enters the liquid inlet cavity through the liquid inlet and the liquid inlet channel, and is discharged from the liquid outlet through the decompression liquid outlet cavity. In the process of discharging the liquid, the high-pressure liquid enters the pressure sensing cavity through the pressure balance connecting pipe, and compresses the rebound sheet according to the liquid inlet pressure;

[0020] When the inlet pressure is less than or equal to the middle value of the preset pressure range, the springback sheet does not deform. At this time, the bottom of the deformation pressure sensor does not contact the top of the lower pressure plate, and the pressure receiver does not receive pressure information. At this time, the stepper motor is started to drive the screw to rotate clockwise and drive the lower pressure plate to move downward. During the downward movement of the lower pressure plate, the pressure change information of the deformation pressure sensor is monitored by the pressure receiver. When the pressure receiver receives obvious pressure increase information, the stepper motor is turned off.

[0021] When the liquid inlet pressure is greater than the middle value of the preset pressure range, the rebound sheet bends upward, and during the bending process, the upper spring is forced to contract, and the lower pressure plate is driven to contact the bottom of the deformation pressure sensor. The pressure change information of the deformation pressure sensor is monitored by the pressure receiver, and the stepper motor is started to drive the screw to rotate counterclockwise. The screw drives the sliding nut to move vertically upward in the sliding limit channel. As the sliding nut moves upward, the sliding connecting rod drives the upper pressure plate, the pressure receiving plate, the upper spring and the lower pressure plate to move upward. When no pressure is generated at the bottom of the deformation pressure sensor, the stepper motor stops. At this time, the lifting rod moves upward, closing and reducing the opening of the liquid inlet channel, and performing a pressure reduction operation on the pressure on the liquid outlet side.

[0022] When the pressure received at the bottom of the deformation pressure sensor is greater than the preset pressure range value, the stepper motor starts to drive the lower pressure plate to return to the initial position, and the liquid inlet channel and the liquid inlet cavity are closed.

[0023] The present invention has the following positive effects:

[0024] First of all, the present invention realizes the pressure regulation operation of the pressurizing valve by automatic adjustment, and presets the pressure range value by adopting the stepper motor adjustment method. In the process of implementing the pressure reducing operation, the pressure range can be correspondingly adjusted according to the pressure change of the fluid, thereby increasing the preset pressure range, and being able to make more responses when the inlet pressure increases and changes, so as to keep the corresponding range values ​​of the inlet pressure and the outlet pressure automatically adjusted. The deformation pressure sensor and the pressure receiver in the automatic pressure regulating device can monitor the pressure during operation, and correspondingly drive the stepper motor to increase or decrease the corresponding range value according to the inlet pressure, so as to ensure that the pressure reducing valve can meet the rebound sheet balancing operation and the increase or decrease operation of the inlet channel when different inlet pressures change during use, and can adaptively adjust the outlet pressure of the pressure reducing valve in real time, and can also respond to the adjustment within the safe pressure range value when the pressure changes at the outlet end of the pressure reducing valve, so as to implement the overall protection operation of the valve body.

[0025] Secondly, the present invention implements a protection operation on the rebound sheet through the lower pressure plate and the lifting support block. When the liquid inlet pressure does not reach the middle value of the preset pressure range, the lower pressure plate can be driven by the stepper motor to drive the lifting rod to continue to descend, thereby implementing an opening operation to increase the opening of the liquid inlet channel. At the same time, when the liquid inlet pressure is balanced with the middle value of the preset pressure range, corresponding adjustment operations can be performed during the increase or decrease of the liquid inlet pressure, and the range value of the preset pressure can be increased when the liquid inlet pressure exceeds the preset pressure, and the sudden increase of the liquid inlet pressure can be responded to within the safety range. During the overall adjustment process, the rebound sheet is always within the protection range of the lower pressure plate and the lifting support block, which improves the safety factor of the product and extends the service life of the product.

[0026] Thirdly, the internal structure of the present invention is relatively simple. The liquid inlet is adjusted through the liquid inlet channel. The isolation block and the bottom blocking sealing baffle cooperate to ensure that the liquid can only enter through the bottom of the liquid inlet chamber. The upper adjustment unit adopts a sliding nut to achieve stable adjustment operation, ensuring stability during operation. The bottom inspection and maintenance sealing head and the top pressure regulating shell and control box can be disassembled for internal maintenance and component replacement operations, which improves the stability of the product during use and facilitates the operation of maintenance and care operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0028] Figure 2 It is a left-side structural schematic diagram of the present invention.

[0029] Figure 3 It is a right view structural schematic diagram of the present invention.

[0030] Figure 4 It is one of the internal structure schematic diagrams of the present invention.

[0031] Figure 5 This is the second schematic diagram of the internal structure of the present invention.

[0032] Figure 6 This is the third schematic diagram of the internal structure of the present invention. DETAILED DESCRIPTION

[0033] like Figure 1 , 2, 3, 4, 5, and 6, a pressure reducing valve with automatic pressure regulation comprises a valve body 1, a liquid inlet 24 and a liquid outlet 25 respectively arranged on both sides of the valve body 1, a pressure sensing shell 6 fixedly mounted on the top of the valve body 1, a pressure regulating shell 9 fixedly mounted above the pressure sensing shell 6, a rebound sheet 7 fixedly mounted between the pressure regulating shell 9 and the pressure sensing shell 6, and a channel opening and closing shell 4 mounted on the bottom of the valve body 1, wherein the inner cavity of the valve body 1 between the liquid inlet 24 and the liquid outlet 25 is fixedly mounted with a passage pipe 16 whose top is fixedly connected to the top surface of the middle part of the inner wall of the valve body 1 as an integral structure, A liquid inlet channel 40 is provided between the bottom of the passage tube 16 on the side facing the liquid inlet 24 and the bottom wall of the valve body 1. The middle parts of both sides of the outer wall of the passage tube 16 are connected to the isolation block 42. The outer side of the isolation block is connected to the inner wall of the valve body 1. The bottom of the isolation block 42 is on the same horizontal plane as the bottom of the passage tube 16. The inner cavity of the passage tube 16 is provided with a liquid inlet cavity 41 connected to the liquid inlet channel 40. A pressure sensing liquid outlet pipe 18 connected to the liquid inlet cavity 41 is fixedly installed at the longitudinal middle position of the passage tube 16 on the side facing the liquid outlet 25. The upper part of the pressure sensing liquid outlet pipe 18 is connected by a reinforced connection. The sealing block 26 is connected to the inner wall of the top of the valve body 1, and the lower part of the pressure sensing liquid outlet pipe 18 is connected to the inner wall of the bottom of the valve body 1 through the bottom blocking sealing partition 17. The inner side of the pressure sensing liquid outlet pipe 18 is provided with a decompression liquid outlet cavity 19 connected with the liquid outlet 25; the bottom of the channel opening and closing shell 4 is installed with an inspection and maintenance sealing head 5 through a threaded connection, and the inner top of the inspection and maintenance sealing head 5 is fixedly installed with a bottom spring connecting block 13, and the inner cavity of the channel opening and closing shell 4 is movably installed with an elastic lifting and sealing sleeve 15 that matches the bottom of the passage pipe 16, and the inner cavity of the elastic lifting and sealing sleeve 15 is connected to the A bottom spring 14 is installed between the outer walls of the bottom spring connecting block 13, and a lifting rod 21 is fixedly installed on the top of the elastic lifting and blocking sleeve 15. The middle part of the lifting rod 21 is located at the longitudinal center position of the liquid inlet chamber 41. After the top of the lifting rod 21 passes through the top center position of the valve body 1, it cooperates with the automatic pressure regulating device arranged on the inner side and upper part of the pressure sensing shell 6 and the pressure regulating shell 9. A pressure balancing connecting pipe 20 whose bottom is connected to the pressure reducing liquid outlet chamber 19 is longitudinally installed in the reinforced connecting blocking block 26, and the top of the pressure balancing connecting pipe 20 cooperates with the automatic pressure regulating device.The automatic pressure regulating device includes a pressure sensing chamber 22 arranged in a pressure sensing shell 6, the pressure sensing chamber 22 is connected to the top of the pressure balance connecting pipe 20, the top of the lifting rod 21 is located at the longitudinal center of the pressure sensing chamber 22, the pressure sensing chamber 22 is located below the rebound sheet 7, a lifting receiving block 23 matched with the top of the lifting rod 21 is fixedly installed at the bottom center of the rebound sheet 7, a sliding limit channel 32 is arranged in the pressure regulating shell 9 above the rebound sheet 7, the sliding limit channel 32 is installed with a screw 36 connected to the output end of the stepping motor 11 on the outer side of the top of the pressure regulating shell 9, and the outer side of the screw 36 is limited and installed in the inner cavity of the sliding limit channel 32 The sliding nut 35, the bottom of the sliding limit channel 32 is fixedly connected to the upper pressure plate 31 through the sliding connecting rod 34, a pressure receiving plate 30 is fixedly installed below the upper pressure plate 31, a deformation pressure sensor 29 is installed at the bottom center of the pressure receiving plate 30, an upper spring 28 is arranged on the outside of the deformation pressure sensor 29 below the pressure receiving plate 30, the bottom of the upper spring 28 is fixedly connected to the top of the lower pressure plate 27, a control box 10 mounted on the outside of the stepping motor 11 is arranged on the top of the pressure regulating shell 9, a controller 37 and a pressure receiver 38 are arranged in the control box 10, and a touch display 12 connected to the controller 37 is arranged on the top of the control box 10.

[0034] The outer sides of the liquid inlet 24 and the liquid outlet 25 are respectively provided with a liquid inlet connecting sleeve 2 and a liquid outlet connecting sleeve 3, the inner diameters of the liquid inlet 24 and the liquid outlet 25 are equal, the passage tube 16 is a cylindrical tubular structure with a flat bottom, the liquid inlet channel 40 is an open structure with an arc-shaped cross-section, the top surface of the liquid inlet channel 40 and the bottom surface of the passage tube 16 are on the same horizontal plane, the isolation block 42 is an arc-shaped block structure, the thickness of the isolation block 42 is equal to the outer diameter of the passage tube 16, and the bottom surface of the isolation block 42 and the top surface of the liquid inlet channel 40 are on the same horizontal plane. The pressure sensing liquid outlet pipe 18 is a cylindrical tubular structure, the outer diameter of the pressure sensing liquid outlet pipe 18 is not greater than the outer diameter of the passage pipe 16, the passage pipe 16 and the pressure sensing liquid outlet pipe 18 are installed perpendicular to each other, the bottom blocking and plugging baffle 17 is an arc structure sleeved on the bottom outer wall of the pressure sensing liquid outlet pipe 18, the bottom blocking and plugging baffle 17 is an arc structure sleeved on the upper outer wall of the pressure sensing liquid outlet pipe 18, the bottom blocking and plugging baffle 17 and the pressure sensing liquid outlet pipe 18 are an integrated structure, the outer side surfaces of the bottom blocking and plugging baffle 17 and the pressure sensing liquid outlet pipe 18 are circular structures, the outer diameter of the circular structure matches the inner diameter of the liquid outlet 25, the bottom blocking and plugging baffle 17 and the pressure sensing liquid outlet pipe 18 isolate the liquid outlet 25 from the liquid inlet channel 40 and the liquid inlet cavity 41. The channel opening and closing shell 4 is a cylindrical structure, the outer diameter of the channel opening and closing shell 4 is not larger than the inner diameter of the valve body 1, the top of the channel opening and closing shell 4 is connected with the middle of the inner cavity of the valve body 1, the central axis of the channel opening and closing shell 4 and the central axis of the passage tube 16 are on the same straight line, the inner diameter of the channel opening and closing shell 4 is equal to the outer diameter of the passage tube 16, an internal thread groove is provided at the top of the maintenance and repair plugging head 5, and an external thread layer matching the internal thread groove is provided at the bottom of the channel opening and closing shell 4.

[0035] The bottom spring connection block 13 is a cylindrical structure, the outer diameter of the bottom spring connection block 13 is not greater than the inner diameter of the elastic lifting plugging sleeve 15, the elastic lifting plugging sleeve 15 is a cylindrical tubular structure with a closed top, the length of the elastic lifting plugging sleeve 15 is not greater than the length of the channel opening and closing shell 4, the outer diameter of the elastic lifting plugging sleeve 15 matches the inner diameter of the channel opening and closing shell 4, the outer diameter of the elastic lifting plugging sleeve 15 is equal to the outer diameter of the passage tube 16, the outer diameter of the bottom spring connection block 13 is equal to the inner diameter of the bottom spring 14, and the inner diameter of the elastic lifting plugging sleeve 15 matches the outer diameter of the bottom spring 14. The lifting rod 21 is a cylindrical structure, the longitudinal central axis of the lifting rod 21 and the central axis of the elastic lifting plugging sleeve 15, the channel opening and closing shell 4 and the passage tube 16 are all in the same straight line, the length of the lifting rod 21 is not less than the outer diameter of the valve body 1, and the diameter of the lifting rod 21 is not greater than the diameter of the liquid inlet chamber 41.

[0036] The pressure sensing shell 6 is a square box structure, the pressure sensing cavity 22 is a square cavity structure, the width of the pressure sensing shell 6 is not greater than the outer diameter of the valve body 1, the rebound sheet 7 is a rectangular sheet structure, the length of the rebound sheet 7 is not less than the length of the pressure sensing shell 6, and the two ends of the rebound sheet 7 in the length direction are respectively flush with the two ends of the length direction of the pressure sensing shell 6. The pressure regulating shell 9 is a rectangular box structure, and a bottom extension body 8 is provided at the bottom of the pressure regulating shell 9. The length and width of the inner cavity of the pressure regulating shell 9 are respectively equal to the length and width of the pressure sensing cavity 22. The lifting receiving block 23 is a cylindrical structure with an arc-shaped groove at the bottom that matches the arc surface of the top of the lifting rod 21, and the length of the lifting receiving block 23 is not greater than the depth of the pressure sensing cavity 22. The sliding limit channel 32 is a box structure with a cross-section in the direction. The sliding limit channel 32 is fixedly installed at the center position of the pressure regulating shell 9 through the sliding limit channel fixing rod 33. A motor heat dissipation groove 39 is arranged at the center position of the control box 10. The deformation pressure sensor 29 is connected to the pressure receiver 38 through a wire, and the pressure receiver 38 is connected to the controller 37 through a wire. The controller 37 is connected to the stepper motor 11 through a wire. The bottom of the pressure receiving plate 30 is fixedly connected to the top of the deformation pressure sensor 29, and the top and bottom of the deformation pressure sensor 29 are both provided with telescopic pressure measuring springs.

[0037] Embodiment 1: The pressure regulating method of the pressure reducing valve of the present invention which automatically regulates the pressure is as follows: in the initial state, both sides of the liquid inlet 24 and the liquid outlet 25 are in a closed state, and the bottom spring 14 is in a naturally retracted state. At this time, the top surface of the elastic lifting and blocking sleeve 15 contacts the bottom of the passage tube 16, and the liquid inlet channel 40 and the liquid inlet cavity 41 are in a closed state. The top of the lifting rod 21 forces the rebound sheet 7 to be bent upward through the lifting receiving block 23. After the power is turned on, the preset pressure range value is adjusted through the touch display 12, and the controller 37 drives the stepping motor 11 to turn on, and the stepping motor 11 drives the screw 36 to rotate clockwise, and the screw 36 drives the sliding nut 35 to slide The limit channel 32 moves vertically downward. As the sliding nut 35 moves downward, the sliding connecting rod 34 drives the upper pressing plate 31, the pressure receiving plate 30, the upper spring 28 and the lower pressing plate 27 to move downward and contact the rebound sheet 7. According to the value of the preset pressure range, the bottom of the lower pressing plate 27 applies pressure to the rebound sheet 7 through the rebound force of the upper spring 28. At this time, the rebound sheet 7 in the upward bending state moves downward, and the lifting receiving block 23 and the lifting rod 21 move downward during the downward movement. When the preset pressure range is reached, the stepping motor 11 stops rotating. At this time, the bottom of the liquid inlet cavity 41 is opened, and the liquid inlet channel 40 is half-open or fully open according to the preset pressure. The passage on one side of the liquid inlet 24 is opened, and the liquid enters the liquid inlet cavity 41 through the liquid inlet 24 and the liquid inlet channel 40, and is discharged from the liquid outlet 25 through the decompression liquid outlet cavity 19. In the process of discharging the liquid, the high-pressure liquid enters the pressure sensing cavity 22 through the pressure balance connecting pipe 20, and compresses the rebound sheet 7 according to the liquid inlet pressure. When the liquid inlet pressure is less than or equal to the middle value of the preset pressure range, the rebound sheet 7 does not deform. At this time, the bottom of the deformation pressure sensor 29 does not contact the top of the lower pressure plate 27, and the pressure receiver 38 does not receive any pressure information. At this time, the stepper motor 11 is started to drive the screw 36 to rotate clockwise and drive the lower pressure plate 27 to move downward. During the downward movement of the lower pressure plate 27, the pressure change information of the deformation pressure sensor 29 is monitored by the pressure receiver 38. When the pressure receiver 38 receives information of obvious pressure increase, the stepper motor 11 is turned off.

[0038] Embodiment 2: When the liquid inlet pressure is greater than the middle value of the preset pressure range, the rebound sheet 7 bends upward, and during the bending process, the upper spring 28 is forced to contract, and the lower pressure plate 27 is driven to contact the bottom of the deformation pressure sensor 29. The pressure change information of the deformation pressure sensor 29 is monitored by the pressure receiver 38, and the stepper motor 11 is started to drive the screw 36 to rotate counterclockwise. The screw 36 drives the sliding nut 35 to move vertically upward in the sliding limit channel 32. As the sliding nut 35 moves upward, the sliding connecting rod 34 drives the upper pressure plate 31, the pressure receiving plate 30, the upper spring 28 and the lower pressure plate 27 to move upward. When no pressure is generated at the bottom of the deformation pressure sensor 29, the stepper motor 11 stops. At this time, the lifting rod 21 moves upward, closing and reducing the opening of the liquid inlet channel 40, and implementing a pressure reduction operation on the pressure on the side of the liquid outlet 25.

[0039] Embodiment 3: When the pressure received at the bottom of the deformation pressure sensor 29 is greater than the preset pressure range value, the stepper motor 11 is started to drive the lower pressing plate 27 to return to the initial position, and the liquid inlet channel 40 and the liquid inlet cavity 41 are closed.

[0040] When the present invention is in use, the pressure sensing shell 6 and the pressure regulating shell 9 are separated by the rebound sheet 7. The width of the rebound sheet 7 is greater than the width of the pressure sensing chamber 22, ensuring that the rebound sheet 7 can separate the pressure sensing chamber 22 and the inner cavity of the pressure regulating shell 9. When the rebound sheet 7 is deformed, the deformation operation occurs at its center position, and the peripheral position of the rebound sheet 7 is fixedly sealed by the bottom of the pressure regulating shell 9 and the top of the pressure sensing shell 6. The liquid entering the pressure sensing chamber 22 through the pressure balance connecting pipe 20 is separated by the rebound sheet 7 into the pressure sensing chamber 22.

[0041] The passage tube 16 adopts a structure in which the top is matched with the top wall inside the valve body 1. When in use, in order to improve the effect of the passage tube 16, a reinforced connection blocking block 26 is used to block the incoming liquid, forcing the incoming liquid to enter the liquid inlet cavity 41 from the bottom liquid inlet channel 40. At the same time, at the outlet end, a bottom blocking sealing baffle 17 is provided at the bottom of the pressure sensing liquid outlet pipe 18 to block the liquid passing through the liquid inlet channel 40 and limit it to the cavity inside the bottom blocking sealing baffle 17 and outside the pressure sensing liquid outlet pipe 18. The overall incoming liquid can only enter the passage tube 16 through the liquid inlet cavity 41 inside the bottom blocking sealing baffle 17, and will not directly flow into the liquid outlet 25 outside the bottom blocking sealing baffle 17, thereby realizing the control operation of liquid inlet.

[0042] The present invention adjusts the longitudinal opening and closing degree of the liquid inlet channel 40 through the elastic lifting and blocking sleeve 15 that can be lifted and lowered, and can use the upward and downward movement of the elastic lifting and blocking sleeve 15 to close and open the liquid inlet cavity 41 channel inside the passage tube 16. The deformation pressure sensor 29 is used in conjunction with the pressure receiver 38, and the controller is used to monitor and control the preset pressure. When the liquid inlet pressure changes, the use range of the pressure reducing valve is increased by changing the preset pressure. At the same time, the rebound sheet 7 can be effectively protected and the service life of the rebound sheet 7 is increased.

[0043] When the equipment fails and needs maintenance, the maintenance plugging head 5 can be removed from the bottom of the channel opening and closing shell. The edge of the bottom extension body 8 is longitudinally provided with a threaded hole that matches the top of the outer edge of the pressure sensing shell 6 and is connected by bolts. The bolts can be removed in the maintenance room to remove the pressure regulating shell for maintenance.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic pressure-regulating pressure reducing valve, comprising a valve body (1), a liquid inlet (24) and a liquid outlet (25) respectively arranged on both sides of the valve body (1), a pressure sensing shell (6) fixedly mounted on the top of the valve body (1), a pressure regulating shell (9) fixedly mounted above the pressure sensing shell (6), a rebound sheet (7) fixedly mounted between the pressure regulating shell (9) and the pressure sensing shell (6), and a channel opening and closing shell (4) mounted on the bottom of the valve body (1), characterized in that: A passage tube (16) is fixedly installed in the inner cavity of the valve body (1) between the liquid inlet (24) and the liquid outlet (25), the top of which is fixedly connected to the top surface of the middle of the inner wall of the valve body (1) to form an integral structure; a liquid inlet channel (40) is provided between the bottom of the passage tube (16) on the side facing the liquid inlet (24) and the bottom wall of the valve body (1); the middle of both sides of the outer wall of the passage tube (16) are connected to the isolation block (42); the outer side of the isolation block is connected to the inner wall of the valve body (1); and the bottom of the isolation block (42) and the bottom of the passage tube (16) are on the same horizontal plane; The inner cavity of the passage tube (16) is provided with a liquid inlet cavity (41) connected to the liquid inlet channel (40); a pressure sensing liquid outlet tube (18) connected to the liquid inlet cavity (41) is fixedly installed at a longitudinal middle position of the passage tube (16) on the side facing the liquid outlet (25); the upper portion of the pressure sensing liquid outlet tube (18) is connected to the top inner wall of the valve body (1) via a reinforced connection blocking block (26); the lower portion of the pressure sensing liquid outlet tube (18) is connected to the bottom inner wall of the valve body (1) via a bottom blocking blocking partition (17); and a pressure reducing liquid outlet cavity (19) connected to the liquid outlet (25) is provided inside the pressure sensing liquid outlet tube (18); The bottom of the channel opening and closing shell (4) is installed with a maintenance plugging head (5) through a threaded connection, and a bottom spring connecting block (13) is fixedly installed on the inner top of the maintenance plugging head (5). The inner cavity of the channel opening and closing shell (4) is movably installed with an elastic lifting plugging sleeve (15) that matches the bottom of the passage pipe (16). A bottom spring (14) is installed between the inner cavity of the elastic lifting plugging sleeve (15) and the outer wall of the bottom spring connecting block (13). A lifting plugging sleeve (15) is fixedly installed on the top of the elastic lifting plugging sleeve (15). The lifting rod (21) is provided with a middle portion of the lifting rod (21) located at the longitudinal center of the liquid inlet chamber (41). The top of the lifting rod (21) passes through the top center of the valve body (1) and cooperates with an automatic pressure regulating device arranged on the inner side and the upper part of the pressure sensing shell (6) and the pressure regulating shell (9). A pressure balancing connecting pipe (20) having a bottom connected to the pressure reducing liquid outlet chamber (19) is longitudinally installed in the reinforced connection blocking block (26). The top of the pressure balancing connecting pipe (20) cooperates with the automatic pressure regulating device. The automatic pressure regulating device comprises a pressure sensing chamber (22) arranged in a pressure sensing shell (6), the pressure sensing chamber (22) being connected to the top of a pressure balancing connecting pipe (20), the top of a lifting rod (21) being located at the longitudinal center of the pressure sensing chamber (22), the pressure sensing chamber (22) being located below a rebound plate (7), a lifting receiving block (23) matching with the top of the lifting rod (21) being fixedly installed at the bottom center of the rebound plate (7), a sliding limit channel (32) being arranged in the pressure regulating shell (9) above the rebound plate (7), a screw rod (36) being connected to the output end of a stepping motor (11) on the outer side of the top of the pressure regulating shell (9), and a sliding limit block (23) being installed in the inner cavity of the sliding limit channel (32) on the outer side of the screw rod (36) A movable nut (35) is provided, the bottom of the sliding limit channel (32) is fixedly connected to the upper pressure plate (31) through a sliding connecting rod (34), a pressure receiving plate (30) is fixedly installed below the upper pressure plate (31), a deformation pressure sensor (29) is installed at the center position of the bottom of the pressure receiving plate (30), an upper spring (28) is arranged on the outside of the deformation pressure sensor (29) below the pressure receiving plate (30), the bottom of the upper spring (28) is fixedly connected to the top of the lower pressure plate (27), a control box (10) mounted on the outside of the stepping motor (11) is arranged on the top of the pressure regulating shell (9), a controller (37) and a pressure receiver (38) are arranged in the control box (10), and a touch display (12) connected to the controller (37) is arranged on the top of the control box (10).

2. The automatic pressure regulating pressure reducing valve according to claim 1, characterized in that: The outer sides of the liquid inlet (24) and the liquid outlet (25) are respectively provided with a liquid inlet connection sleeve (2) and a liquid outlet connection sleeve (3); the inner diameters of the liquid inlet (24) and the liquid outlet (25) are equal; the passage tube (16) is a cylindrical tubular structure with a flat bottom; the liquid inlet channel (40) is an open structure with an arc-shaped cross section; the top surface of the liquid inlet channel (40) and the bottom surface of the passage tube (16) are on the same horizontal plane; the isolation block (42) is an arc-shaped block structure; the thickness of the isolation block (42) is equal to the outer diameter of the passage tube (16); and the bottom surface of the isolation block (42) and the top surface of the liquid inlet channel (40) are on the same horizontal plane.

3. The automatic pressure regulating pressure reducing valve according to claim 1, characterized in that: The pressure sensing liquid outlet pipe (18) is a cylindrical tubular structure. The outer diameter of the pressure sensing liquid outlet pipe (18) is not greater than the outer diameter of the passage pipe (16). The passage pipe (16) and the pressure sensing liquid outlet pipe (18) are installed perpendicular to each other. The bottom blocking and plugging baffle (17) is an arc-shaped structure sleeved on the bottom outer wall of the pressure sensing liquid outlet pipe (18) and the upper outer wall of the pressure sensing liquid outlet pipe (18). The bottom blocking and plugging baffle (17) and the pressure sensing liquid outlet pipe (18) are an integrated structure. The outer side surfaces of the bottom blocking and plugging baffle (17) and the pressure sensing liquid outlet pipe (18) are circular structures. The outer diameter of the circular structure matches the inner diameter of the liquid outlet (25). The bottom blocking and plugging baffle (17) and the pressure sensing liquid outlet pipe (18) isolate the liquid outlet (25) from the liquid inlet channel (40) and the liquid inlet cavity (41).

4. The automatic pressure regulating pressure reducing valve according to claim 1, characterized in that: The channel opening and closing shell (4) is a cylindrical structure. The outer diameter of the channel opening and closing shell (4) is not greater than the inner diameter of the valve body (1). The top of the channel opening and closing shell (4) is connected to the middle of the inner cavity of the valve body (1). The central axis of the channel opening and closing shell (4) and the central axis of the passage tube (16) are on the same straight line. The inner diameter of the channel opening and closing shell (4) is equal to the outer diameter of the passage tube (16). An internal thread groove is provided on the top of the maintenance plugging head (5), and an external thread layer matching the internal thread groove is provided at the bottom of the channel opening and closing shell (4).

5. The automatic pressure regulating pressure reducing valve according to claim 1, characterized in that: The bottom spring connection block (13) is a cylindrical structure. The outer diameter of the bottom spring connection block (13) is not greater than the inner diameter of the elastic lifting plugging sleeve (15). The elastic lifting plugging sleeve (15) is a cylindrical tubular structure with a closed top. The length of the elastic lifting plugging sleeve (15) is not greater than the length of the channel opening and closing shell (4). The outer diameter of the elastic lifting plugging sleeve (15) matches the inner diameter of the channel opening and closing shell (4). The outer diameter of the elastic lifting plugging sleeve (15) is equal to the outer diameter of the passage tube (16). The outer diameter of the bottom spring connection block (13) is equal to the inner diameter of the bottom spring (14). The inner diameter of the elastic lifting plugging sleeve (15) matches the outer diameter of the bottom spring (14).

6. The automatic pressure regulating pressure reducing valve according to claim 1, characterized in that: The lifting rod (21) is of a cylindrical structure. The longitudinal center axis of the lifting rod (21) is aligned with the center axes of the elastic lifting and blocking sleeve (15), the channel opening and closing shell (4), and the passage tube (16). The length of the lifting rod (21) is not less than the outer diameter of the valve body (1), and the diameter of the lifting rod (21) is not greater than the diameter of the liquid inlet chamber (41).

7. The automatic pressure regulating pressure reducing valve according to claim 2, characterized in that: The pressure sensing shell (6) is a square box structure, the pressure sensing cavity (22) is a square cavity structure, the width of the pressure sensing shell (6) is not greater than the outer diameter of the valve body (1), the rebound sheet (7) is a rectangular sheet structure, the length of the rebound sheet (7) is not less than the length of the pressure sensing shell (6), and both ends of the rebound sheet (7) in the length direction are respectively flush with both ends of the pressure sensing shell (6) in the length direction, the pressure regulating shell (9) is a rectangular box structure, the bottom of the pressure regulating shell (9) is provided with a bottom extension body (8), the length and width of the inner cavity of the pressure regulating shell (9) are respectively equal to the length and width of the pressure sensing cavity (22), the lifting receiving block (23) is a cylindrical structure with an arc-shaped groove at the bottom thereof matched with the arc surface at the top of the lifting rod (21), and the length of the lifting receiving block (23) is not greater than the depth of the pressure sensing cavity (22).

8. The automatic pressure regulating pressure reducing valve according to claim 2, characterized in that: The sliding limit channel (32) is a box structure with a cross-section in the direction. The sliding limit channel (32) is fixedly installed at the center position of the pressure regulating shell (9) through the sliding limit channel fixing rod (33). A motor heat dissipation groove (39) is provided at the center position of the control box (10). The deformation pressure sensor (29) is connected to the pressure receiver (38) through a wire. The pressure receiver (38) is connected to the controller (37) through a wire. The controller (37) is connected to the stepping motor (11) through a wire. The bottom of the pressure receiving plate (30) is fixedly connected to the top of the deformation pressure sensor (29). The top and bottom of the deformation pressure sensor (29) are both provided with telescopic pressure measuring springs.

9. A pressure regulating method for an automatic pressure regulating pressure reducing valve according to any one of claims 1 to 8, characterized in that: The method is: S1. In the initial state, both sides of the liquid inlet (24) and the liquid outlet (25) are in a closed state, and the bottom spring (14) is in a naturally retracted state. At this time, the top surface of the elastic lifting and blocking sleeve (15) contacts the bottom of the passage tube (16), and the liquid inlet channel (40) and the liquid inlet cavity (41) are in a closed state. The top of the lifting rod (21) forces the rebound sheet (7) to be bent upward through the lifting receiving block (23). After the power is turned on, the preset pressure range value is adjusted through the touch display (12), and the controller (37) drives the stepping motor (11) to turn on. The stepping motor (11) drives the screw rod (36) to rotate clockwise, and the screw rod (36) drives the sliding nut (35) to move vertically in the sliding limit channel (32). The sliding nut (35) moves downward, and as the sliding nut (35) moves downward, the sliding connecting rod (34) drives the upper pressure plate (31), the pressure receiving plate (30), the upper spring (28) and the lower pressure plate (27) to move downward and contact the rebound plate (7). According to the value of the preset pressure range, the bottom of the lower pressure plate (27) applies pressure to the rebound plate (7) through the rebound force of the upper spring (28). At this time, the rebound plate (7) in the upward bending state moves downward, and in the process of moving downward, it drives the lifting receiving block (23) and the lifting rod (21) to move downward. When the preset pressure range is reached, the stepping motor (11) stops rotating. At this time, the bottom of the liquid inlet chamber (41) is opened, and the liquid inlet channel (40) is in a half-open or fully-open state according to the preset pressure value. S2, opening the passage on one side of the liquid inlet (24), allowing the liquid to enter the liquid inlet chamber (41) through the liquid inlet (24) and the liquid inlet passage (40), and to be discharged from the liquid outlet (25) through the decompression liquid outlet chamber (19). During the process of discharging the liquid, the high-pressure liquid enters the pressure sensing chamber (22) through the pressure balancing connecting pipe (20), and compresses the rebound sheet (7) according to the liquid inlet pressure; When the inlet pressure is less than or equal to the middle value of the preset pressure range, the springback sheet (7) does not deform, and at this time, the bottom of the deformation pressure sensor (29) does not contact the top of the lower pressure plate (27), and the pressure receiver (38) does not receive any pressure information. At this time, the stepper motor (11) is started to drive the screw rod (36) to rotate clockwise and drive the lower pressure plate (27) to move downward. During the downward movement of the lower pressure plate (27), the pressure change information of the deformation pressure sensor (29) is monitored by the pressure receiver (38). When the pressure receiver (38) receives information of obvious pressure increase, the stepper motor (11) is turned off; When the liquid inlet pressure is greater than the middle value of the preset pressure range, the rebound sheet (7) bends upward, and during the bending process, the upper spring (28) is forced to contract, and the lower pressure plate (27) is driven to contact the bottom of the deformation pressure sensor (29). The pressure change information of the deformation pressure sensor (29) is monitored through the pressure receiver (38), and the stepper motor (11) is started to drive the screw rod (36) to rotate counterclockwise. The screw rod (36) drives the sliding nut (35) to move vertically upward in the sliding limit channel (32). As the sliding nut (35) moves upward, the sliding connecting rod (34) drives the upper pressure plate (31), the pressure receiving plate (30), the upper spring (28) and the lower pressure plate (27) to move upward. When no pressure is generated at the bottom of the deformation pressure sensor (29), the stepper motor (11) stops. At this time, the lifting rod (21) moves upward, closing and reducing the opening of the liquid inlet channel (40), and performing a pressure reduction operation on the side pressure of the liquid outlet (25); When the pressure received at the bottom of the deformation pressure sensor (29) is greater than a preset pressure range value, the stepper motor (11) is started, driving the lower pressure plate (27) to return to the initial position, and the liquid inlet channel (40) and the liquid inlet chamber (41) are closed.

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