Aerodynamic triplex capable of pressure balance regulation

Abstract

The utility model discloses a kind of pneumatic triplexes capable of adjusting pressure balance, belong to pneumatic triplexes technical field. Including filter, pressure reducing valve, pressure regulator and oil atomizer, filter, pressure reducing valve intercommunication, pressure regulator and oil atomizer intercommunication, there is first pipeline between pressure regulator and pressure reducing valve intercommunication, the side surface of pressure regulator is connected with second pipeline, there is feedback regulating valve between first pipeline and second pipeline intercommunication, diaphragm type pressure sensor is installed in the inside of pressure regulator, and the control end of feedback regulating valve is electrically connected with diaphragm type pressure sensor;The technical scheme is synergistically designed through filtering, preliminary pressure reduction, bidirectional voltage stabilizing, lubricating function, in combination with the real-time linkage of diaphragm type pressure sensor and normally closed feedback regulating valve, realize the quick, accurate regulation of compressed air pressure, effectively solve the core problem that traditional pneumatic triplexes pressure response is slow, fluctuation is big, provide stable pressure source for downstream execution component, simultaneously extend the service life of precision component and guarantee lubricating effect.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic triplet technology, specifically a pneumatic triplet capable of adjusting pressure balance. Background Technology

[0002] The pneumatic triplet is a key component in a compressed air system, consisting of a filter, a pressure reducing valve, and an oil mist lubricator connected in series. Its main function is to filter, reduce pressure, and lubricate compressed air, providing a clean, stable, and lubricating air source for pneumatic actuators. During the operation of a pneumatic system, the stability of the air source pressure directly affects the working accuracy of the actuators; for example, parameters such as cylinder movement speed and clamping force are closely related to the air source pressure.

[0003] Existing pneumatic triplet units, after setting the output pressure via a pressure reducing valve, experience pressure fluctuations when the input pressure fluctuates or the instantaneous air consumption of downstream actuators changes, leading to pressure imbalance in the downstream air source. While traditional pressure reducing valves offer some pressure stabilization, their pressure regulation response is slow for high-precision pneumatic systems, making it difficult to meet high stability requirements. Furthermore, pressure fluctuations can cause unstable atomization in the lubricator, affecting lubrication performance and accelerating wear on actuators. Therefore, a pneumatic triplet unit capable of rapidly responding to pressure changes and precisely adjusting pressure balance is needed. Utility Model Content

[0004] The purpose of this invention is to provide a pneumatic triplet capable of adjusting pressure balance, in order to solve the problems mentioned in the background art.

[0005] In view of the above problems, the technical solution proposed by this utility model is as follows:

[0006] A pneumatic triplet capable of regulating pressure balance includes a filter, a pressure reducing valve, a pressure regulator, and an oil mist lubricator. The filter and pressure reducing valve are connected, as are the pressure regulator and the oil mist lubricator. A first pipe connects the pressure regulator and the pressure reducing valve, and a second pipe connects to the side of the pressure regulator. A feedback regulating valve connects the first and second pipes. A diaphragm pressure sensor is installed inside the pressure regulator. The control terminal of the feedback regulating valve is electrically connected to the diaphragm pressure sensor. The diaphragm pressure sensor monitors the pressure in real time and works in conjunction with the feedback regulating valve to achieve bidirectional pressure regulation of low-pressure replenishment and high-pressure limiting, solving the problems of slow response and easy pressure fluctuation in traditional pressure reducing valves. The design of a bypass pipeline to replenish additional gas can quickly compensate for pressure loss. Compared with the traditional method of relying solely on pressure reducing valve regulation, it can improve the pressure recovery speed and meet the stringent requirements of high-precision pneumatic systems for pressure stability. At the same time, the stable pressure environment ensures uniform atomization effect of the oil mist lubricator and reduces wear of actuators caused by poor lubrication.

[0007] Furthermore, the pressure regulator includes a connector and an adjustment cover. The adjustment cover is fixedly installed on the bottom surface of the connector and has an air chamber inside. The diaphragm pressure sensor is installed inside the air chamber. The connector has an air inlet and an air outlet at both ends, which are connected to the air chamber. The adjustment cover has a through hole on its side, which is connected to the air chamber. One end of the second pipe is fixed inside the through hole. The two ends of the first pipe are connected to the output end and the air inlet of the pressure reducing valve, respectively. The air inlet and outlet of the connector allow for orderly airflow. The air chamber of the adjustment cover provides a closed space for pressure balance. The through hole ensures that bypass airflow enters the air chamber. The overall structure results in a short pressure regulation path and low resistance, improving pressure regulation efficiency. The diaphragm pressure sensor has a built-in air chamber, so the detection data is not affected by external airflow, further ensuring the stability of the output pressure and avoiding regulation deviations caused by pressure detection errors.

[0008] Furthermore, the output end of the filter is connected to the input end of the pressure reducing valve, and the air outlet is connected to the input end of the oil mist lubricator. The components are connected in series according to their functions. The filter protects the pressure reducing valve, feedback regulating valve and other components. The stable pressure output by the pressure regulator prevents the oil mist lubricator from becoming too dense or having no oil mist due to pressure fluctuations, ensuring the reliability of lubrication of the actuator, improving the overall air source quality of the pneumatic system and reducing the probability of equipment failure due to air source problems.

[0009] Furthermore, a wiring groove is provided on the side of the regulating cover. The wiring groove is connected to the air chamber. The connection line between the control end of the feedback regulating valve and the diaphragm pressure sensor passes through the wiring groove, and the space between the wiring groove and the control end of the feedback regulating valve passes through the wiring groove. The wiring groove provides a neat arrangement channel for the connection line, avoiding messy tangling and interference with other components, and improving the neatness of the device assembly. The filling of the sealant makes the sealing level of the wiring groove reach IP65, effectively preventing air chamber pressure leakage, ensuring the accuracy of pressure regulation, and extending the service life of the diaphragm pressure sensor, reducing the later maintenance cost.

[0010] Furthermore, the feedback regulating valve includes a valve body, a valve core disposed within the valve body, and an electromagnetic drive connected to the valve core. The valve core is connected to the output end of the electromagnetic drive, which is electrically connected to a diaphragm pressure sensor and drives the valve core to move axially along the valve body. The electromagnetic drive drives the valve core to move axially, resulting in a fast response time and ensuring immediate response to pressure changes. The valve core and valve body are precision ground to fit together, preventing airflow leakage when closed and avoiding pressure abnormalities caused by internal leakage of the valve. At the same time, the axially moving valve core structure is less prone to jamming, improving the long-term operational reliability of the feedback regulating valve.

[0011] Furthermore, the feedback regulating valve is a normally closed two-position two-way solenoid valve. The nominal diameter of the feedback regulating valve matches the inner diameter of the second pipe. The normally closed design ensures stable system pressure under non-pressure replenishment conditions, avoiding energy waste and the risk of pressure runaway. The design of matching the nominal diameter with the second pipe maximizes the airflow replenishment speed, avoids airflow turbulence caused by an excessively small diameter, and reduces pressure loss in the pipe.

[0012] Furthermore, the filter, pressure reducing valve, pressure regulator, and oil mist lubricator are connected by G-threads, and PTFE tape is wrapped around the interfaces of the filter, pressure reducing valve, pressure regulator, and oil mist lubricator. The G-thread connection reduces the assembly difficulty, allowing ordinary operators to complete the installation and improving construction efficiency. The PTFE tape ensures that the compressed air pressure is not lost during transmission, ensuring that each component operates stably according to the design pressure parameters, reducing pressure fluctuations caused by interface leakage, and further improving the overall sealing performance and operational reliability of the pneumatic triplet.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This pneumatic triplet, which can regulate pressure balance, achieves rapid and accurate regulation of compressed air pressure through the coordinated design of filtering, preliminary pressure reduction, bidirectional pressure stabilization, and lubrication functions, combined with the real-time linkage of a diaphragm pressure sensor and a normally closed feedback regulating valve. It effectively solves the core problems of slow pressure response and large fluctuations in traditional pneumatic triplets, provides a stable air source for downstream actuators, extends the service life of precision components and ensures lubrication effect, and improves the working accuracy of the pneumatic system and the operational stability of the equipment. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the first pneumatic triplet capable of adjusting pressure balance disclosed in an embodiment of the present utility model.

[0015] Figure 2 This is a side view of the pneumatic triplet capable of adjusting pressure balance disclosed in an embodiment of the present utility model.

[0016] Figure 3 This is a cross-sectional structural diagram of the pneumatic triplet capable of adjusting pressure balance disclosed in an embodiment of this utility model.

[0017] Figure 4 This is a schematic diagram of the second three-dimensional structure of the pneumatic triplet capable of adjusting pressure balance disclosed in an embodiment of the present utility model;

[0018] Figure 5 This is a top view of the pneumatic triplet capable of adjusting pressure balance disclosed in an embodiment of this utility model.

[0019] In the diagram: 1. Filter; 2. Pressure reducing valve; 3. Connector; 4. Oil mist lubricator; 5. First pipe; 6. Second pipe; 7. Feedback regulating valve; 8. Regulating cover; 9. Diaphragm pressure sensor; 10. Air inlet; 11. Air outlet; 12. Through hole. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1 - Figure 5 This utility model provides a technical solution: a pneumatic triplet capable of adjusting pressure balance, comprising a filter 1, a pressure reducing valve 2, a pressure regulator, and an oil mist lubricator 4. The filter 1 and pressure reducing valve 2 are connected, the pressure regulator and oil mist lubricator 4 are connected, a first pipe 5 connects the pressure regulator and pressure reducing valve 2, a second pipe 6 connects to the side of the pressure regulator, and a feedback regulating valve 7 connects the first pipe 5 and the second pipe 6. A diaphragm pressure sensor 9 is installed inside the pressure regulator, and the control end of the feedback regulating valve 7 is electrically connected to the diaphragm pressure sensor 9. Compressed air first passes through the filter 1 to filter impurities, then enters the pressure reducing valve 2 to initially reduce the pressure to near the target pressure range, and is then delivered to the balance chamber of the pressure regulator through the first pipe 5. The diaphragm pressure sensor 9 monitors the real-time pressure in the balance chamber and compares it with the preset target pressure. When the real-time pressure is lower than the target pressure, the diaphragm pressure sensor 9 sends an electrical signal to the electromagnetic actuator of the feedback regulating valve 7. The electromagnetic actuator drives the valve core to open, opening the second pipe 6. This allows another portion of the gas to supplement the first pipe 5 through the second pipe 6 and the feedback regulating valve 7, merging with the gas flowing directly through the first pipe 5 and entering the gas chamber, causing the pressure inside the chamber to quickly rise back to the target value. When the real-time pressure is higher than the target pressure, the diaphragm pressure sensor 9 de-energizes the electromagnetic actuator of the feedback regulating valve 7, resetting the valve core and closing the second pipe 6. At this time, the pressure reducing valve 2, through its own valve core adjustment, reduces the airflow pressure output to the first pipe 5, thereby gradually reducing the pressure inside the gas chamber to the target value. Finally, the gas, after being stabilized by the pressure regulator, is delivered to the lubricator 4 for lubrication and then supplied to the downstream actuators. See also Figure 2 As shown, pressure reducing valve 2 is located between filter 1 and pressure regulator, and pressure regulator is located between pressure reducing valve 2 and oil mist lubricator 4.

[0022] Specifically, the selected model of the diaphragm pressure sensor 9 is MPX5010DP (range 0-10kPa) or MPX5700DP (range 0-700kPa), which is determined according to the commonly used pressure range (0.1-1MPa) of the pneumatic system; its accuracy class is ±0.25%FS (full scale accuracy), ensuring that the pressure detection error is within the allowable range and avoiding adjustment deviation due to insufficient detection accuracy; its operating temperature range is -40℃-125℃, which is suitable for the common workshop ambient temperature (5℃-40℃) of pneumatic systems, preventing low temperature condensation or high temperature aging from affecting performance.

[0023] Specifically, the rated voltage of the feedback regulating valve 7 is DC24V, the rated current is 0.5A, and the power is 12W, which conforms to the general power supply standard for industrial pneumatic components, avoiding drive failure due to voltage mismatch; its nominal diameter is consistent with the inner diameter of the second pipe 6, and the flow capacity Cv value is ≥0.5, ensuring that there is no obvious throttling when the airflow is replenished, and the pressure recovery speed meets the design requirements; its leakage is ≤0.1mL / min (air, under 0.3MPa pressure), which meets the leakage requirements in GB / T7940.3-2000 "Pneumatic 5-way air valves Part 3: Functional specifications and dimensions", avoiding abnormal pressure caused by internal leakage of the valve.

[0024] Specifically, the upper and lower limits of the pressure regulation threshold deviate from the target pressure by ±4%.

[0025] As an embodiment of this utility model, the pressure regulator further includes a connector 3 and an adjusting cover 8. The adjusting cover 8 is fixedly installed on the bottom surface of the connector 3. An air chamber is provided inside the adjusting cover 8, and a diaphragm pressure sensor 9 is installed inside the air chamber. An air inlet 10 and an air outlet 11 are respectively provided at both ends of the connector 3. Both the air inlet 10 and the air outlet 11 are connected to the air chamber. A through hole 12 is opened on the side of the adjusting cover 8, which is connected to the air chamber. One end of the second pipe 6 is fixed inside the through hole 12. Both ends of the first pipe 5 are connected to the output end of the pressure reducing valve 2 and the air inlet 10, respectively. The pressure reducing gas output by the pressure reducing valve 2 enters the adjusting cover 8 through the first pipe 5 and the air inlet 10 of the connector 3. The air chamber is a pressure chamber. When pressure needs to be added, the feedback regulating valve 7 opens, and another part of the depressurized gas enters the air chamber through the through hole 12 on the side of the second pipe 6 and the regulating cover 8, and merges with the airflow input from the first pipe 5 to quickly increase the air chamber pressure. When pressure needs to be reduced, the feedback regulating valve 7 closes, the pressure reducing valve 2 reduces the output pressure, the airflow pressure input into the air chamber through the air inlet 10 decreases, and the air chamber pressure drops accordingly. The diaphragm pressure sensor 9 directly contacts the airflow in the air chamber, captures pressure changes in real time, and the gas after pressure stabilization is delivered from the air outlet 11 of the connector 3 to the oil mist lubricator 4. The fixed structure of the connector 3 and the regulating cover 8 ensures that the air chamber is sealed and avoids airflow leakage from affecting the pressure regulation accuracy.

[0026] Specifically, the volume of the 8 air chambers in the regulating hood is 50–100 cm³. 3 The roughness of the inner wall of the air chamber is ≤1.6μm, thereby reducing the turbulence of the airflow in the chamber and avoiding the detection deviation of the diaphragm pressure sensor 9 caused by uneven local pressure; the connector 3 and the adjustment cover 8 are fixed by M4 hexagonal bolts, and nitrile rubber sealing rings are added to the contact surfaces of the two.

[0027] As an embodiment of this utility model, the output end of filter 1 is connected to the input end of pressure reducing valve 2, and the air outlet 11 is connected to the input end of oil mist lubricator 4. Compressed air flows in the order of filter 1, pressure reducing valve 2, pressure regulator, and oil mist lubricator 4, forming a complete processing flow of filtration, pressure reduction, bidirectional pressure stabilization, and lubrication. Filter 1 filters moisture and impurities in compressed air to prevent impurities from clogging the valve core of pressure reducing valve 2 or the valve port of feedback regulating valve 7, thus affecting the regulating function. After the pressure is stabilized by the pressure regulator, the gas enters oil mist lubricator 4. The stable pressure ensures that the lubricating oil in oil mist lubricator 4 is atomized according to a preset ratio and transported to the downstream actuator along with the airflow to achieve lubrication.

[0028] As an embodiment of this utility model, a wiring groove is further provided on the side of the regulating cover 8. The wiring groove is connected to the air chamber. The connection line between the control end of the feedback regulating valve 7 and the diaphragm pressure sensor 9 passes through the wiring groove, and the space between them is filled with sealant. The connection line between the electromagnetic drive of the feedback regulating valve 7 and the diaphragm pressure sensor 9 passes through the wiring groove on the side of the regulating cover 8 and enters the air chamber to realize the transmission of electrical signals between the two. The silicone sealant filled in the wiring groove can fill the gap between the line and the groove wall, prevent the compressed air in the air chamber from leaking out of the wiring groove, and at the same time isolate external dust and moisture from entering the air chamber, so as to avoid the detection element of the diaphragm pressure sensor 9 from getting damp and contaminated, which would affect the detection accuracy.

[0029] Specifically, the diaphragm pressure sensor 9 incorporates a signal acquisition unit and a preprocessing module. Its core function is to convert the pressure signal within the air chamber into a weak analog voltage signal by changing the resistance of the strain gauge due to diaphragm deformation. The preprocessing module first filters this analog signal (using an RC low-pass filter circuit to remove high-frequency interference signals and avoid interference from airflow vibrations) and amplifies it (using an operational amplifier to amplify the signal to a 0-10V standard analog signal, improving the signal transmission's anti-interference capability). Subsequently, the preprocessed analog signal is transmitted to the microcontroller built into the voltage regulator (such as an STM32F103 series microcontroller, integrating...). The microcontroller (with A / D conversion function) converts analog signals into digital signals through the A / D conversion module and compares them with a preset target pressure digital threshold. When the digital signal is detected to be lower than the lower threshold, the microcontroller outputs a high-level control signal (DC24V, matching the rated voltage of the electromagnetic drive of the feedback regulating valve 7); when the digital signal is detected to be higher than the upper threshold, the microcontroller outputs a low-level control signal (DC0V). After receiving the control signal, the electromagnetic drive of the feedback regulating valve 7 drives the valve core to move according to the signal level change, thereby opening or closing the second pipeline 6 and completing the pressure regulation.

[0030] Specifically, the connection line between the electromagnetic drive of the feedback regulating valve 7 and the diaphragm pressure sensor 9 is a shielded cable.

[0031] As an embodiment of this utility model, the feedback regulating valve 7 further includes a valve body, a valve core disposed within the valve body, and an electromagnetic drive connected to the valve core. The valve core is connected to the output end of the electromagnetic drive, and the electromagnetic drive is electrically connected to the diaphragm pressure sensor 9, driving the valve core to move axially along the valve body. When the diaphragm pressure sensor 9 detects that the air chamber pressure is lower than the target value, it sends a high-level signal to the electromagnetic drive. The electromagnetic drive is energized to generate electromagnetic force, driving the valve core to move axially along the valve body in the opening direction, opening the internal channel of the valve body, and making the second pipe 6 connected to the first pipe 5 to achieve high-pressure airflow replenishment. When the air chamber pressure is detected to be higher than the target value, the diaphragm pressure sensor 9 sends a low-level signal, the electromagnetic drive is de-energized, and the valve core moves axially along the valve body in the closing direction under the elastic force of the return spring, blocking the valve body channel and cutting off the airflow in the second pipe 6.

[0032] As an embodiment of this utility model, the feedback regulating valve 7 is further described as a normally closed two-position two-way solenoid valve. The nominal diameter of the feedback regulating valve 7 matches the inner diameter of the second pipe 6. When there is no electrical signal, the valve core of the normally closed two-position two-way solenoid valve is in the closed state, and the second pipe 6 is always cut off to prevent unreduced high-pressure airflow from entering the first pipe 5 without cause, which would lead to an abnormal increase in the air chamber pressure. When an electrical signal is received from the diaphragm pressure sensor 9, the solenoid valve switches to the open state. Its nominal diameter matches the inner diameter of the second pipe 6, which can ensure that the high-pressure airflow enters the air chamber at the maximum flow rate without throttling loss in the pipe, and quickly replenishes the pressure. When the electrical signal disappears, the solenoid valve resets and closes, returning to the normally closed state.

[0033] As an embodiment of this utility model, the filter 1, pressure reducing valve 2, pressure regulator, and oil mist lubricator 4 are further connected by a standard G-thread. The filter 1, pressure reducing valve 2, and oil mist lubricator 4 are all provided with threaded holes that mate with the G-thread. The inner walls of the air inlet 10 and air outlet 11 of the pressure regulator can be provided with threads. PTFE tape is wrapped around the interfaces of the filter 1, pressure reducing valve 2, pressure regulator, and oil mist lubricator 4. The use of standard G-thread connections allows for quick assembly and disassembly, and component replacement can be completed with just a wrench during later maintenance. The PTFE tape wrapped around the interfaces fills the gaps between the threads during tightening, forming a tight sealing layer to prevent compressed air leakage from the interface gaps. Simultaneously, the PTFE tape has aging resistance and high-pressure resistance properties, maintaining a long-term sealing effect and avoiding pressure loss due to seal failure.

[0034] It should be noted that all standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through a control cabinet. The control circuit can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Furthermore, since this application is mainly used to protect mechanical devices, this application will not explain the control method and circuit connection in detail.

Claims

1. A pneumatic triplet capable of adjusting pressure balance, characterized in that, The device includes a filter (1), a pressure reducing valve (2), a pressure regulator, and an oil mist lubricator (4). The filter (1) is connected to the pressure reducing valve (2), the pressure regulator is connected to the oil mist lubricator (4), a first pipe (5) connects the pressure regulator and the pressure reducing valve (2), a second pipe (6) connects the side of the pressure regulator, a feedback regulating valve (7) connects the first pipe (5) and the second pipe (6), a diaphragm pressure sensor (9) is installed inside the pressure regulator, and the control end of the feedback regulating valve (7) is electrically connected to the diaphragm pressure sensor (9).

2. A pneumatic triplet capable of adjusting pressure balance according to claim 1, characterized in that, The pressure regulator includes a connector (3) and an adjustment cover (8). The adjustment cover (8) is fixedly installed on the bottom surface of the connector (3). An air chamber is provided inside the adjustment cover (8). The diaphragm pressure sensor (9) is installed inside the air chamber. An air inlet (10) and an air outlet (11) are respectively provided at both ends of the connector (3). The air inlet (10) and the air outlet (11) are both connected to the air chamber. A through hole (12) is opened on the side of the adjustment cover (8). The through hole (12) is connected to the air chamber. One end of the second pipe (6) is fixed inside the through hole (12). The two ends of the first pipe (5) are respectively connected to the output end of the pressure reducing valve (2) and the air inlet (10).

3. A pneumatic triplet capable of adjusting pressure balance according to claim 2, characterized in that, The output end of the filter (1) is connected to the input end of the pressure reducing valve (2), and the air outlet (11) is connected to the input end of the oil mist lubricator (4).

4. A pneumatic triplet capable of adjusting pressure balance according to claim 2, characterized in that, The side of the regulating cover (8) is also provided with a wiring groove, which is connected to the air chamber. The connection line between the control end of the feedback regulating valve (7) and the diaphragm pressure sensor (9) passes through the wiring groove and is filled with sealant between them.

5. A pneumatic triplet capable of adjusting pressure balance according to claim 1, characterized in that, The feedback regulating valve (7) includes a valve body, a valve core disposed in the valve body, and an electromagnetic drive connected to the valve core. The valve core is connected to the output end of the electromagnetic drive, and the electromagnetic drive is electrically connected to the diaphragm pressure sensor (9) and drives the valve core to move axially along the valve body.

6. A pneumatic triplet capable of adjusting pressure balance according to claim 1, characterized in that, The feedback regulating valve (7) is a normally closed two-position two-way solenoid valve, and the nominal diameter of the feedback regulating valve (7) matches the inner diameter of the second pipeline (6).

7. A pneumatic triplet capable of adjusting pressure balance according to claim 1, characterized in that, The filter (1), the pressure reducing valve (2), the pressure regulator and the oil mist lubricator (4) are connected by G-threads, and PTFE tape is wrapped around the interface of the filter (1), the pressure reducing valve (2), the pressure regulator and the oil mist lubricator (4).

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