A pressure regulating device and method for precisely controlling perfusion pressure

Abstract

The application discloses a kind of pressure regulating device and pressure regulating method of accurate control perfusion pressure, it is related to engineering pressure control technical field, including inlet slurry pipeline component, pressure regulating component, water supply component, measurement and control component and to be perfusion container;The inlet slurry pipeline component includes inlet slurry pipe, slurry pipe check valve and control valve, the inlet slurry pipe one end is connected with grouting pump, other end is sequentially connected slurry pipe check valve, pressure regulating component, control valve after with to be perfusion container intercommunication;The application simple structure is mainly composed of tubular shell, capsule, conventional pump valve and detecting instrument, spare part is easy to process, purchase is convenient, compared with servo control system, variable frequency pressure regulating equipment, and equipment purchase and operation cost are greatly reduced.The device can be directly connected in series on existing pipeline, without substantially modifying original equipment.

Description

Technical Field

[0001] This invention relates to the field of engineering pressure control technology, specifically to a pressure regulating device and method for precisely controlling injection pressure. Background Technology

[0002] In many industrial fields such as civil engineering and machining, it is often necessary to inject liquids (such as cement grout, chemical grout, hydraulic oil, etc.) into the interior of target containers or structures under certain pressure to achieve purposes such as filling, reinforcement, correction, and shaping. The accuracy of controlling the injection pressure directly affects the quality of the project and the safety of the structure.

[0003] Taking the correction and lifting of buildings in civil engineering as an example, when a building experiences uneven settlement, pressure grouting is typically used to inject grout into the foundation soil layer. The pressure of the grout then slowly lifts the building to the design elevation. If the grouting pressure is too low, the lifting effect will not be achieved; if the grouting pressure is too high, it may lead to sudden structural rise or even damage, causing a major safety accident. Therefore, precise control of the grouting pressure is crucial.

[0004] Currently, the commonly used methods for controlling injection pressure and their limitations are as follows: (1) Nozzle diameter control method: Under the condition of constant flow rate, the pressure is changed by changing nozzles of different diameters. Once the pressure is set, it is difficult to adjust online and cannot adapt to dynamically changing injection requirements.

[0005] (2) Variable frequency drive (VFD) method: The speed of the grouting pump is adjusted by a VFD, thereby changing the flow rate and indirectly regulating the pressure. This method has a high equipment cost and a slow response to precise control of low flow rate and high pressure.

[0006] (3) Return valve adjustment method: When the slurry feed rate is constant, the pressure is adjusted by changing the return flow rate by adjusting the opening of the return valve. This method has a rough control and large pressure fluctuations, and is only suitable for occasions with low requirements.

[0007] (4) Servo feedback control method: The closed-loop control of servo motor and pressure sensor is adopted. It has high accuracy but the equipment is expensive and the maintenance is complicated, making it difficult to promote on a large scale in construction sites.

[0008] Therefore, developing an injection pressure control device that is simple in structure, low in cost, precise in pressure control, and easily adjustable has significant engineering practical value and economic benefits. Summary of the Invention

[0009] To address the aforementioned technical problems, this invention provides a pressure regulating device and method for precisely controlling grouting pressure. This invention abandons traditional high-cost precision equipment such as frequency converters and servo motors, and utilizes a combination structure of a rigid shell and a flexible bladder. It combines a high-pressure, low-flow water pump to achieve a graded pressure regulating mode that combines coarse grouting pressure maintenance with precise pressure boosting through micro-squeezing of water pressure. This significantly improves pressure control accuracy, adapts to different construction sites and working conditions, and is convenient for cleaning and maintenance.

[0010] The technical solution adopted by the present invention to solve its technical problem is: a pressure regulating device for precisely controlling the injection pressure, comprising a slurry inlet pipeline assembly, a pressure regulating assembly, a water supply assembly, a measurement and control assembly, and a container to be injected; The grout inlet pipeline assembly includes a grout inlet pipe, a grout pipe check valve, and a control valve. One end of the grout inlet pipe is connected to a grouting pump, and the other end is connected to the container to be grouted after being connected in series with the grout pipe check valve, the pressure regulating assembly, and the control valve. The pressure regulating assembly includes a tubular outer shell and a bladder. The tubular outer shell is made of high-strength material and has a hollow cavity inside. The bladder is a high-strength soft-sealed structure, coaxially nested inside the tubular outer shell. The outer wall contour of the bladder matches the inner wall contour of the tubular outer shell, forming a gap between the bladder and the tubular outer shell. At least one water inlet is provided on the side wall of the tubular outer shell, which is used to inject pressure medium into the gap between the bladder and the tubular outer shell. A pressure regulating valve is also installed on the side wall of the tubular outer shell. An inlet flange and an outlet flange are fixedly provided at both ends of the tubular outer shell, and the tubular outer shell is sealed to the slurry inlet pipe through the inlet flange and the outlet flange. An inlet end face and an outlet end face are provided at both ends of the bladder, which are clamped between the tubular outer shell flange and the slurry inlet pipe flange to achieve an overall seal.

[0011] The water supply assembly includes a water pump and a water pipe check valve. The water pump is a high-pressure, low-flow water pump, and its flow rate can be adjusted within the range of 0 to a set constant. The water pump can be manually driven or electrically driven. The outlet of the water pump is connected to the water pipe check valve, and the other end of the water pipe check valve is connected to the inlet of the tubular outer shell. The water pump is used to deliver a pressure medium into the gap between the bladder and the tubular outer shell. The pressure medium is preferably clean water.

[0012] The measurement and control components include a pressure gauge and an exhaust valve. Both the pressure gauge and the exhaust valve are installed on the container to be filled. The pressure gauge is used to monitor the filling pressure inside the container in real time, and the exhaust valve is used to discharge the gas accumulated in the pipeline and inside the container.

[0013] The pressure regulating valve is a pressure relief regulating valve, used to release the pressure medium in the gap and achieve pressure reduction.

[0014] The outlet section of the tubular shell is designed with a conical structure to ensure smooth slurry flow.

[0015] The tubular outer shell is made of steel, fiberglass, or high-strength fiber-wound material.

[0016] The capsule is made of composite rubber or high-strength fiber composite fabric.

[0017] When the water pump is electrically driven, the device is also equipped with an industrial controller and a pressure sensor; the pressure sensor is installed inside the container to be filled, and the pressure sensor and the electric water pump are electrically connected to the industrial controller, which realizes automatic pressure regulation.

[0018] Based on the aforementioned pressure regulating device for precisely controlling infusion pressure, the present invention also provides a pressure regulating method for precisely controlling infusion pressure, comprising the following steps: S1 Equipment Assembly and Sealing Inspection: Connect the tubular outer shell and the bladder body in series with flange seals on the slurry inlet pipe, and connect the slurry pipe check valve, control valve, and the container to be filled in sequence. Complete the pipeline and line connection of the water pump, water pipe check valve, pressure regulating valve, pressure gauge, and air vent valve. Thoroughly check the sealing performance of each interface and flange to ensure no leakage. S2 Preliminary Grouting and Venting: Start the external grouting pump. The grout flows along the grout inlet pipe, through the grout pipe check valve and the internal cavity of the bladder, and then enters the container to be grouted. Open the vent valve to release the air in the pipeline and container. When the grout continues to flow out of the vent valve, close the vent valve and continue grouting into the container. S3 Pre-compression shutdown and pressure holding: Observe the pressure value of the pressure gauge in real time. When the pressure inside the container to be grouted is close to the preset design pressure, shut down the grouting pump. Under the blocking action of the one-way valve in the grout pipe, the grout cannot flow back and the pressure inside the container remains stable. S4 Precision Pressure Boosting and Regulation: Start the water pump, and the pressure medium is injected into the gap between the bladder and the tubular outer shell through the water pipe check valve and the inlet; the pressure medium gradually squeezes the bladder, causing it to contract and squeeze the slurry inside, and the pressure inside the injection container slowly increases; continuously monitor the pressure gauge until the pressure inside the container reaches the preset design pressure; S5 Pressure Correction and Pressure Holding Operation: If the pressure inside the container exceeds the design value during the pressurization process, slowly open the pressure regulating valve to release part of the pressure medium in the gap and reduce the pressure to the preset standard value; after the pressure reaches the standard, close the control valve and perform pressure holding operation on the container; S6 Equipment Pressure Relief and Cleaning Reset: After the grouting and pressure holding operations are completed, fully open the pressure regulating valve to release the pressure medium in the gap and relieve the cavity pressure; disassemble the outlet flange of the tubular shell, connect clean water to the grouting pump, start the grouting pump, and use clean water circulation to flush the grout inlet pipeline and the internal cavity of the bladder; after cleaning, shut down all equipment and complete the device reset.

[0019] Furthermore, when using an electric water pump in conjunction with an automatic control mode, the target pressure value is pre-entered into the industrial controller; the pressure sensor collects the pressure signal in the container to be filled in real time and transmits it to the industrial controller; when the detected pressure reaches the preset value, the industrial controller automatically controls the electric water pump to stop, completing fully automatic pressure regulation.

[0020] Compared with the prior art, the beneficial effects of the present invention are: (1) The present invention has a simple structure, mainly composed of a tubular outer shell, a bladder, conventional pumps and valves, and detection instruments. The parts are easy to process and convenient to purchase. Compared with servo control systems and frequency converters, it significantly reduces the cost of equipment purchase and maintenance. The device can be directly connected in series with existing pipelines without the need for major modifications to the original equipment; (2) This invention has excellent pressure regulation accuracy. It relies on a high-pressure, low-flow water pump to introduce pressure medium into the gap, and achieves stepless fine adjustment of injection pressure through a flexible extrusion bladder. The pressure change is smooth and controllable, and can accurately reach the preset pressure value, effectively avoiding structural and workpiece damage caused by sudden pressure changes. The equipment is equipped with dual one-way valves to prevent medium backflow. With the pressure relief and regulating valve, it can quickly correct overpressure conditions. The manual and electric drive modes can be flexibly switched, which can meet the needs of on-site manual operation and can also be connected to the industrial control system to achieve automated control. It is safe to operate and flexible to operate. (3) The present invention has low maintenance difficulty in the later stage. After the operation is completed, clean water can be introduced to quickly flush the pipeline and the inside of the bladder, making the cleaning operation simple and efficient. The outer shell is made of high-strength material and the bladder is made of wear-resistant and high-strength soft material. The overall structure has strong compressive strength and can adapt to different working conditions and complex working environments such as grouting in civil engineering and industrial hydraulic molding. It has a long service life and good engineering application value. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall assembly structure of the pressure regulating device of the present invention; Figure 2 This is a schematic diagram of the tubular outer shell structure of the present invention; Figure 3 This is a schematic diagram of the capsule structure of the present invention.

[0023] The diagram shows: 1. Slurry inlet pipe, 2. Slurry pipe check valve, 3. Container, 4. Outer shell, 5. Pressure regulating valve, 6. Water pump, 7. Water pipe check valve, 8. Water inlet, 9. Control valve, 10. Container, 11. Pressure gauge, 12. Outer shell inlet flange, 13. Outer shell outlet flange, 14. Inlet end face, 15. Outlet end face, 16. Outlet section, 17. Air vent valve. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] Example 1, referring to Figure 1-3 This embodiment provides a pressure regulating device for precisely controlling the injection pressure, including a grout inlet pipeline assembly, a pressure regulating assembly, a water supply assembly, a measurement and control assembly, and an injection container 10.

[0026] The grout inlet pipeline assembly includes a grout inlet pipe 1, a grout pipe check valve 2, and a control valve 9. One end of the grout inlet pipe 1 is connected to a grouting pump, and the other end is connected to the grout pipe check valve 2, the pressure regulating assembly, and the control valve 9 in series.

[0027] The pressure regulating assembly includes a tubular outer shell 4 and a bladder 3. The tubular outer shell 4 is made of high-strength steel and has a hollow cavity inside. The bladder 3 is a high-strength soft sealing structure made of composite rubber. The bladder 3 is coaxially nested inside the tubular outer shell 4, and the outer wall contour of the bladder 3 matches the inner wall contour of the tubular outer shell 4, forming a gap between the bladder 3 and the tubular outer shell 4. An inlet 8 is provided on the side wall of the tubular outer shell 4 for injecting pressure medium into the gap between the bladder 3 and the tubular outer shell 4. A pressure regulating valve 5 is also installed on the side wall of the tubular outer shell 4. This pressure regulating valve 5 is a pressure relief valve used to release the pressure medium in the gap, thereby reducing the pressure. An inlet flange 12 and an outlet flange 13 are fixedly installed at both ends of the tubular outer shell 4, and the tubular outer shell 4 is sealed to the slurry inlet pipe 1 through the inlet flange 12 and the outlet flange 13. The outlet section 16 of the tubular outer shell 4 is designed with a conical structure to ensure smooth slurry flow. The capsule 3 has an inlet end face 14 and an outlet end face 15 at its two ends. The inlet end face 14 and the outlet end face 15 are clamped between the tubular outer shell flange and the slurry inlet pipe flange, and the whole is sealed by bolt tightening.

[0028] The water supply assembly includes a water pump 6 and a water pipe check valve 7. In this embodiment, the water pump 6 is a manually driven high-pressure, low-flow water pump, and its flow rate can be adjusted within the range of 0 to a set constant. The outlet of the water pump 6 is connected to the water pipe check valve 7, and the other end of the water pipe check valve 7 is connected to the inlet 8 of the tubular outer shell 4. The water pump 6 is used to deliver pressure medium into the gap between the bladder 3 and the tubular outer shell 4.

[0029] The measurement and control components include a pressure gauge 11 and an exhaust valve 17, both of which are installed on the container 10 to be filled. The pressure gauge 11 is used to monitor the filling pressure inside the container in real time, and the exhaust valve 17 is used to discharge the gas accumulated in the pipeline and inside the container.

[0030] The voltage regulation method corresponding to this embodiment includes the following steps: S1 Equipment Assembly and Sealing Inspection: Connect the tubular outer shell 4 and the bladder 3 in series via flange sealing on the slurry inlet pipe 1, and connect the slurry pipe check valve 2, control valve 9, and filling container 10 in sequence. Complete the pipeline and line connection of water pump 6, water pipe check valve 7, pressure regulating valve 5, pressure gauge 11, and exhaust valve 17. Thoroughly check the sealing performance of each interface and flange to ensure no leakage. S2 Preliminary Grouting and Venting: Start the external grouting pump. The grout flows along the grout inlet pipe 1, through the grout pipe check valve 2 and the internal cavity of the bladder 3, and then enters the container to be grouted 10. Open the vent valve 17 to vent the air in the pipeline and container. When the grout continues to flow out of the vent valve 17, close the vent valve 17 and continue grouting into the container 10. S3 Pre-compression shutdown and pressure holding: Observe the pressure value of pressure gauge 11 in real time. When the internal pressure of the container 10 to be grouted is close to the preset design pressure, shut down the grouting pump. Under the blocking action of the one-way valve 2 of the grout pipe, the grout cannot flow back and the pressure inside the container 10 remains stable. S4 Precision Pressure Adjustment: Start the water pump 6, and the pressure medium is injected into the gap between the bladder 3 and the tubular outer shell 4 through the water pipe check valve 7 and the water inlet 8; the pressure medium gradually squeezes the bladder 3, causing the bladder to contract and squeeze the slurry inside, and the pressure inside the injection container 10 slowly increases; continuously observe the pressure gauge 11 until the pressure inside the container 10 reaches the preset design pressure. S5 Pressure Correction and Pressure Holding Operation: If the pressure inside container 10 exceeds the design value during the pressurization process, slowly open the pressure regulating valve 5 to release part of the pressure medium in the gap and reduce the pressure to the preset standard value; after the pressure reaches the standard, close the control valve 9 and perform pressure holding operation on container 10. S6 Equipment Depressurization and Cleaning Reset: After the grouting and pressure holding operations are completed, fully open the pressure regulating valve 5 to release the pressure medium in the gap and relieve the cavity pressure; disassemble the outlet flange 13 of the tubular outer shell 4, connect clean water to the grouting pump, start the grouting pump, and use clean water circulation to flush the grout inlet pipe 1 and the internal cavity of the bladder 3; after cleaning, shut down all equipment and complete the device reset.

[0031] Example 2: This example provides a pressure regulating device for precisely controlling injection pressure. The main structure, pipeline connection method, and basic working process of this example are consistent with those of Example 1. The main difference between the two lies in the driving form and control method.

[0032] In this embodiment, the water pump 6 is an electrically driven high-pressure low-flow water pump, and the flow rate can also be adjusted within the range of 0 to a set constant. The device is additionally equipped with an industrial controller and a pressure sensor. The pressure sensor is installed inside the container 10 to be filled. The pressure sensor and the electric water pump 6 are both electrically connected to the industrial controller, and the pressure can be automatically controlled through the industrial controller.

[0033] This embodiment of the pressure regulation method adds an automatic control process to the steps of Embodiment 1: the target pressure value is pre-entered into the industrial controller, and the electric water pump 6 is started after completing steps S1 to S3; the pressure sensor collects the pressure signal in the container 10 to be filled in real time and transmits it to the industrial controller; when the detected pressure reaches the preset value, the industrial controller automatically controls the electric water pump 6 to stop, completing the fully automatic pressure regulation. If overpressure occurs, the pressure is manually released through the pressure regulating valve 5 according to step S5. The equipment depressurization and cleaning reset steps in S6 are exactly the same as in Embodiment 1.

[0034] Of course, the above description is not limited to the examples above. Technical features not described in this invention can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solutions of this invention and are not intended to limit this invention. This invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention do not depart from the spirit of this invention and should also fall within the scope of protection of the claims of this invention.

Claims

1. A pressure regulating device for precisely controlling injection pressure, characterized in that, It includes a grout inlet pipeline assembly, a pressure regulating assembly, a water supply assembly, a measurement and control assembly, and a container to be injected (10); The grouting pipeline assembly includes a grouting pipe (1), a grouting pipe check valve (2), and a control valve (9). One end of the grouting pipe (1) is connected to a grouting pump, and the other end is connected to the grouting pipe check valve (2), a pressure regulating assembly, and a control valve (9) in series. The pressure regulating assembly includes a tubular outer shell (4) and a bladder (3). The tubular outer shell (4) has a hollow cavity inside. The bladder (3) is coaxially nested inside the tubular outer shell (4), and the outer wall contour of the bladder (3) matches the inner wall contour of the tubular outer shell (4), forming a gap between the bladder (3) and the tubular outer shell (4). At least one water inlet (8) is provided on the side wall of the tubular outer shell (4), and the water inlet (8) is used to inject pressure medium into the gap between the bladder (3) and the tubular outer shell (4). A pressure regulating valve (5) is also installed on the side wall of the shell (4); an inlet flange (12) and an outlet flange (13) are fixedly installed at both ends of the tubular shell (4), and the tubular shell (4) is sealed and connected to the slurry inlet pipe (1) through the inlet flange (12) and the outlet flange (13); an inlet end face (14) and an outlet end face (15) are respectively provided at both ends of the bladder (3), and the inlet end face (14) and the outlet end face (15) are clamped between the flange of the tubular shell (4) and the flange of the slurry inlet pipe (1) to achieve overall sealing; The water supply assembly includes a water pump (6) and a water pipe check valve (7). The outlet of the water pump (6) is connected to the water pipe check valve (7), and the other end of the water pipe check valve (7) is connected to the inlet (8) of the tubular outer shell (4). The measurement and control components include a pressure gauge (11) and an exhaust valve (17), both of which are installed on the container (10) to be filled.

2. The pressure regulating device for precisely controlling the injection pressure according to claim 1, characterized in that, The outlet section (16) of the tubular outer shell (4) is configured as a conical structure.

3. The pressure regulating device for precisely controlling the infusion pressure according to claim 1, characterized in that, The tubular outer shell (4) is made of steel, fiberglass or high-strength fiber-wound material.

4. The pressure regulating device for precisely controlling the infusion pressure according to claim 1, characterized in that, The material of the capsule (3) is composite rubber or high-strength fiber composite cloth.

5. The pressure regulating device for precisely controlling the infusion pressure according to claim 1, characterized in that, The water pump (6) is a high-pressure, low-flow water pump. The flow rate of the water pump (6) can be adjusted from 0 to a set constant range. The water pump (6) can be manually driven or electrically driven.

6. The pressure regulating device for precisely controlling the infusion pressure according to claim 5, characterized in that, When the water pump (6) is electrically driven, the device also includes an industrial controller and a pressure sensor. The pressure sensor is installed inside the container (10) to be filled. The pressure sensor and the electric water pump (6) are both electrically connected to the industrial controller.

7. The pressure regulating device for precisely controlling the injection pressure according to claim 1, characterized in that, The pressure regulating valve (5) is a pressure relief regulating valve used to release the pressure medium in the gap to regulate the pressure.

8. A pressure regulation method for precisely controlling the infusion pressure based on the device according to any one of claims 1-5, characterized in that, Includes the following steps: S1 Equipment Assembly and Sealing Inspection: Connect the tubular outer shell (4) and the bladder (3) in series through the flange seal on the slurry inlet pipe (1), and connect the slurry pipe check valve (2), control valve (9), and filling container (10) in sequence. Complete the pipeline connection of water pump (6), water pipe check valve (7), pressure regulating valve (5), pressure gauge (11), and exhaust valve (17), and check the sealing performance of each interface and flange. S2 Preliminary grouting and venting: Start the external grouting pump. The grout flows along the grout inlet pipe (1) through the grout pipe check valve (2) and the internal cavity of the bladder (3) before entering the container to be grouted (10). Open the vent valve (17) to vent the air in the pipeline and container. When the grout continues to flow out of the vent valve (17), close the vent valve (17) and continue grouting. S3 Pre-compression shutdown and pressure maintenance: Observe the pressure gauge (11) value in real time. When the internal pressure of the container (10) to be grouted is close to the preset design pressure, shut down the grouting pump and rely on the check valve (2) of the grout pipe to prevent the grout from flowing back and keep the pressure inside the container (10) stable. S4 Precision Pressure Adjustment: Start the water pump (6), and the pressure medium is injected into the gap between the bladder (3) and the tubular shell (4) through the water pipe check valve (7) and the inlet (8). The pressure medium squeezes the bladder (3) to contract, and then squeezes the slurry in the bladder (3) to increase the pressure in the container (10) until the pressure gauge (11) shows that the pressure has reached the preset design pressure. S5 Pressure Correction and Pressure Holding Operation: If the pressure inside the container (10) exceeds the design value, slowly open the pressure regulating valve (5) to release part of the pressure medium in the gap and adjust the pressure to the preset standard value; after the pressure reaches the standard, close the control valve (9) and perform pressure holding operation; S6 Equipment Depressurization and Cleaning Reset: After the pressure holding is completed, fully open the pressure regulating valve (5) to release the pressure medium in the gap; disassemble the outlet flange (13) of the tubular shell (4), connect clean water to the grouting pump, start the grouting pump to circulate and flush the grout inlet pipe (1) and the internal cavity of the bladder (3), and shut down all equipment after cleaning is completed.

9. The pressure regulation method for precisely controlling the infusion pressure according to claim 8, characterized in that, When an electrically driven water pump (6) is used, the target pressure value is preset in the industrial controller; the pressure sensor collects the pressure signal in the container (10) in real time and transmits it to the industrial controller. When the pressure reaches the preset value, the industrial controller automatically controls the water pump (6) to stop.

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