A screw pump and a comprehensive test bench suitable for a screw pump pneumatic valve

Abstract

The utility model discloses a screw rod pump and be applicable to screw rod pump pneumatic valve piece comprehensive test platform, and the test platform includes: air source cylinder, valve front cylinder, valve rear cylinder, a plurality of electromagnetic switch valve, air path between air source cylinder, valve front cylinder, valve rear cylinder is connected in series, and is as main gas path, the test branch gas path of pressure maintaining valve, inlet valve, pressure switch valve and safety valve is connected with main gas path, and the electromagnetic switch valve is arranged between main gas path and test branch gas path, wherein, the test branch gas path of safety valve is connected with the air path between air source cylinder, valve front cylinder, the test branch gas path of pressure maintaining valve, inlet valve, pressure switch valve is connected with the air path between valve front cylinder, valve rear cylinder, and, the air inlet of air source cylinder, valve front cylinder, valve rear cylinder all is provided with pressure sensor, the utility model solves the problem that there is no detection equipment for screw rod pump pneumatic valve piece on market.

Description

Technical Field

[0001] This utility model relates to the field of screw pump testing technology, specifically to a screw pump and a comprehensive test bench for pneumatic valves of screw pumps. Background Technology

[0002] Screw pumps have advantages such as simple structure, few vulnerable parts, low discharge temperature, large pressure ratio, and stable operation, and are widely used as air source devices in air brakes.

[0003] Pneumatic valves (including inlet valves, pressure maintaining valves, safety valves, and pressure switches) are important components of screw pumps, controlling the air passage and safety protection of the pump. Their performance directly affects the reliability of the screw pump operation. If performance deteriorates or is damaged, it often leads to serious failures such as rotor jamming and burnout or cracking of the oil separator.

[0004] In existing technologies, screw pump testing equipment is mostly for whole-machine testing, lacking dedicated testing devices for individual pneumatic valves, resulting in low troubleshooting efficiency and high maintenance costs. Furthermore, traditional testing relies on manual operation, which suffers from insufficient accuracy and low efficiency.

[0005] The utility model patent with publication number CN215218045U discloses a research-oriented comprehensive test bench for pneumatic valve products for rail vehicles. It is applicable to research and production testing of various pneumatic valve products in the braking system of rail vehicles, and its target is the pneumatic valve components of rail vehicles. Utility Model Content

[0006] The technical problem to be solved by this utility model is that it is currently impossible to perform separate and accurate performance testing on the pneumatic valves of screw pumps.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0008] A comprehensive test bench for pneumatic valves of screw pumps includes: an air source cylinder 10, a pre-valve cylinder 20, a post-valve cylinder 30, and multiple electromagnetic switch valves;

[0009] The air circuits between the air source cylinder 10, the pre-valve cylinder 20, and the post-valve cylinder 30 are connected in series and serve as the main air circuit; the test branch air circuits of the pressure maintaining valve, the inlet valve, the pressure switch valve, and the safety valve under test are connected to the main air circuit, and an electromagnetic switch valve is installed between the main air circuit and the test branch air circuit.

[0010] The test air path of the safety valve is connected to the air source cylinder 10 and the pre-valve cylinder 20; the test air paths of the pressure maintaining valve, the inlet valve, and the pressure switch valve are all connected to the air source cylinder 20 and the post-valve cylinder 30; and pressure sensors 40 are installed at the air inlets of the air source cylinder 10, the pre-valve cylinder 20, and the post-valve cylinder 30.

[0011] Technical benefits: It can test pneumatic valves of screw pumps, including safety valves, air inlet valves, pressure maintaining valves and pressure switching valves. Moreover, the air circuits for testing pneumatic valves are independent and do not affect each other, which solves the problem that valves can only be visually inspected and their operating parameters cannot be measured.

[0012] In this embodiment, an electromagnetic switch valve YA1 is provided in the air path between the air source cylinder 10 and the valve front cylinder 20.

[0013] In this embodiment, the test air path of the safety valve is connected to the air path between the solenoid switch valve YA1 and the air source cylinder 10; and the solenoid switch valve YA2 is provided on the test air path.

[0014] In this embodiment, a first throttle valve 12 is provided in the air path between the electromagnetic switch valve YA1 and the cylinder 20 before the valve.

[0015] In this embodiment, the air source cylinder 10 is connected to the air source.

[0016] In this embodiment, a solenoid switch valve YA3 is installed on the test branch of the pressure maintaining valve; a solenoid switch valve YA4 is installed on the air line connected to the air intake valve seat interface on the test branch of the intake valve, and a solenoid switch valve YA5 is installed on the air line connected to the air intake valve pressure relief interface; a solenoid switch valve YA6 is installed on the test branch of the pressure switch valve.

[0017] In this embodiment, a second throttle valve 23 is provided in the air path between the pre-valve cylinder 20 and the post-valve cylinder 30; the test branch air path of the pressure maintaining valve, intake valve, pressure switch valve and safety valve to be tested is provided in the air path between the pre-valve cylinder 20 and the second throttle valve 23.

[0018] In this embodiment, the comprehensive test bench for pneumatic valves of screw pumps also includes a PLC system; the electromagnetic switching valves and pressure sensors 40 on multiple electromagnetic switching valves, air source cylinders 10, pre-valve cylinders 20, and post-valve cylinders 30 are all connected to the PLC system.

[0019] In this embodiment, the integrated test bench for screw pump pneumatic valves also includes a display screen 50; the display screen 50 is connected to the PLC system.

[0020] Technical benefits: This invention provides a comprehensive test bench for screw pump pneumatic valves that can be automatically tested, solving the problems that currently screw pump pneumatic valves can only be visually inspected, cannot measure action parameters, have low efficiency in manual testing, and lack automated control and intuitive display.

[0021] This utility model also provides a screw pump, which is tested using the aforementioned comprehensive test bench for pneumatic valve components of screw pumps.

[0022] Compared with existing technologies, the advantages of this invention are: by constructing a multi-path air circuit through electromagnetic switching valves, cylinders, and pressure sensors, it simulates the actual working conditions of a screw pump, breaking through the traditional whole-machine testing mode of screw pumps and realizing individual performance evaluation of screw pump pneumatic valves. Based on a PLC system, it realizes the logic control of air circuit on / off, supports manual and automatic dual-mode detection, and, combined with a display, visualizes the measured action parameters.

[0023] Previously, locomotive screw pumps were managed as condition-based maintenance components. When a fault occurred, the component or the entire pump was replaced, and the faulty pump was then sent out for repair, resulting in long troubleshooting times and high maintenance costs. After this test bench is put into use, regular inspections and fault analysis of screw pump valves can be carried out, allowing for the timely detection of malfunctioning components and preventing the screw pump from operating with defects, which could lead to the escalation of the fault and unnecessary return to the factory for repairs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a comprehensive test bench for pneumatic valves of screw pumps, according to an embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram showing the connection between the test bench and the PLC system in an embodiment of this utility model. Detailed Implementation

[0026] To facilitate understanding of the technical solution of this utility model by those skilled in the art, the technical solution of this utility model will now be further described in conjunction with the accompanying drawings.

[0027] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0028] Please see Figure 1As shown, this utility model provides a comprehensive test bench for pneumatic valves of screw pumps, including: an air source cylinder 10, a pre-valve cylinder 20, a post-valve cylinder 30, and multiple electromagnetic switching valves. The air paths of the air source cylinder 10, the pre-valve cylinder 20, and the post-valve cylinder 30 are connected in series and form the main air path. The test branch air paths of the pressure maintaining valve, the inlet valve, the pressure switching valve, and the safety valve under test are connected to the main air path. Electromagnetic switching valves are installed between the main air path and the test branch air paths.

[0029] In this embodiment, the test air path of the safety valve is connected to the air path between the air source cylinder 10 and the pre-valve cylinder 20. The test air paths of the pressure maintaining valve, the intake valve, and the pressure switching valve are all connected to the air path between the pre-valve cylinder 20 and the post-valve cylinder 30. Furthermore, a pressure sensor 40 is installed at the air inlet of the air source cylinder 10, the pre-valve cylinder 20, and the post-valve cylinder 30.

[0030] Please see Figure 1 and Figure 2 As shown, in this embodiment, the electromagnetic switch valve includes a solenoid valve and a relay. The solenoid switch valve YA7 of the air source cylinder 10 and its corresponding solenoid valve KA7, the solenoid switch valve YA8 of the upstream cylinder 20 and its corresponding solenoid valve KA8, and the solenoid switch valve YA9 of the downstream cylinder 30 and its corresponding solenoid valve KA9 are all directly connected to the power supply to achieve manual control.

[0031] In this embodiment, an electromagnetic switch valve YA1 is installed in the air path between the air source cylinder 10 and the pre-valve cylinder 20. The test branch air path of the safety valve is connected to the air path between the electromagnetic switch valve YA1 and the air source cylinder 10. An electromagnetic switch valve YA2 is also installed in the test branch air path. A first throttle valve 12 is installed in the air path between the electromagnetic switch valve YA1 and the pre-valve cylinder 20, and the air source cylinder 10 is connected to the air source.

[0032] Among them, the solenoid valve KA1 corresponding to solenoid switch valve YA1 and the solenoid valve KA2 corresponding to solenoid switch valve YA2 are both directly connected to the power supply.

[0033] In this embodiment, a solenoid valve YA3 is installed on the test branch of the pressure maintaining valve. On the test branch of the intake valve, a solenoid valve YA4 is installed on the air line connected to the intake valve seat interface, and a solenoid valve YA5 is installed on the air line connected to the intake valve pressure relief interface. A solenoid valve YA6 is installed on the test branch of the pressure switching valve. The solenoid valves KA3, KA4, KA5, and KA6, corresponding sequentially to solenoid valves YA3, YA4, YA5, and YA6, are all directly connected to a power source.

[0034] In this embodiment, a second throttle valve 23 is provided in the air path between the pre-valve cylinder 20 and the post-valve cylinder 30. The test air path for the pressure maintaining valve, intake valve, pressure switch valve, and safety valve under test is provided in the air path between the pre-valve cylinder 20 and the second throttle valve 23.

[0035] Please see Figure 1 and Figure 2 As shown, the comprehensive test bench for pneumatic valves of screw pumps also includes a PLC system and a display screen 50. Multiple solenoid valves, the solenoid valves on the air source cylinder 10, the pre-valve cylinder 20, and the post-valve cylinder 30, the pressure sensor 40, and the display screen 50 are all connected to the PLC system. Specifically, the PLC system is connected to the relays KM1 to KM9 corresponding to the solenoid valves YA1 to YA9 in sequence. By controlling the energization and de-energization of relays KM1 to KM9, the corresponding solenoid valves KA1 to KA9 are closed and opened. For example, when the PLC system controls relay KM1 to be energized, the corresponding solenoid valve KA1 closes, thus opening the air path between the air source cylinder 10 and the pre-valve cylinder 20. When the PLC system controls relay KM1 to be de-energized, the corresponding solenoid valve KA1 opens, thus disconnecting the air path between the air source cylinder 10 and the pre-valve cylinder 20. The control of other solenoid valves is similar.

[0036] Please see Figure 1 and Figure 2 As shown, in this embodiment, the detection scheme for the pressure maintaining valve is as follows:

[0037] Controlled manually or by a PLC system, firstly, energize solenoid valves YA1 and YA3, causing the pressure in the upstream cylinder 20 to rise. When pressure appears in the downstream cylinder 30, record the pressure value of the upstream cylinder 20; this is the opening pressure of the upstream cylinder 20. Secondly, when the pressures in the upstream cylinder 20 and the downstream cylinder 30 are equal, energize solenoid valve YA8 to release air from the upstream cylinder 20. Finally, check if the pressure in the downstream cylinder 30 drops within 15 seconds. If it drops, it indicates "poor pressure holding performance," and the test ends. If it does not drop, it indicates "good pressure holding performance," and the test ends. The test results are displayed on screen 50.

[0038] In this embodiment, the pressure switch detection scheme is as follows:

[0039] First, check if the pressure switch is conducting. If it is not conducting, display screen 50 will show "Pressure switch malfunction," and the experiment will end. If it is conducting, energize solenoid valves YA1 and YA6, causing the pressure in cylinder 20 before the valves to rise until the pressure switch disconnects. Then, solenoid valve YA1 is de-energized, and the pressure in cylinder 20 before the valves is the pressure switch's activation value, which is displayed on display screen 50, and the experiment ends.

[0040] In this embodiment, the safety valve detection scheme is as follows:

[0041] First, confirm whether the air source pressure is greater than 850 kPa. If it is less than 850 kPa, an alarm will sound and the message "Air source pressure insufficient" will be displayed. If it is greater than or equal to 850 kPa, the solenoid valve YA2 will be energized. Then, pull the safety valve handle to check if air is released. This is a manual check. If no air is released, it indicates that the safety valve is malfunctioning. End the experiment and manually input the result into display 50. If air is released, it indicates that the safety valve is functioning well. End the experiment, and display 50 will show the result.

[0042] In this embodiment, the intake valve detection scheme is as follows:

[0043] First, energize solenoid valve YA1, causing the pressure in cylinder 20 before the valve to rise. Time the rise for 5 seconds. After 5 seconds, energize solenoid valve YA4 and time the rise for 15 seconds. Then, check if the pressure in cylinder 20 before the valve drops. If it drops, it indicates "poor pressure holding performance." De-energize solenoid valves YA1 and YA4, and energize solenoid valve YA8. Cylinder 20 before the valve releases air, ending the experiment. If the pressure does not drop, it indicates "good pressure holding performance." Energize solenoid valve YA5 and time the rise for 14 seconds. Check again if the pressure in cylinder 20 before the valve drops below 300 kPa. If it does not drop below 300 kPa, it indicates "poor pressure relief performance." De-energize solenoid valves YA1, YA4, and YA5, and energize solenoid valve YA8. Cylinder 20 before the valve releases air, ending the experiment. If the pressure drops below 300 kPa, it indicates "good pressure relief performance." End the experiment, and display 50 shows the test results.

[0044] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0045] The above-described embodiments are merely examples of implementation methods of the utility model. The scope of protection of this utility model is not limited to the above-described embodiments. For those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and these all fall within the scope of protection of this utility model.

Claims

1. A comprehensive test bench for pneumatic valve components of screw pumps, characterized in that, include: Air source cylinder (10), valve front cylinder (20), valve rear cylinder (30), multiple electromagnetic switch valves; The air circuits between the air source cylinder (10), the pre-valve cylinder (20), and the post-valve cylinder (30) are connected in series and serve as the main air circuit; the test branch air circuits of the pressure maintaining valve, the inlet valve, the pressure switch valve, and the safety valve are connected to the main air circuit, and an electromagnetic switch valve is installed between the main air circuit and the test branch air circuit. Among them, the test air path of the safety valve is connected to the air path between the air source cylinder (10) and the valve front cylinder (20); the test air paths of the pressure maintaining valve, the air inlet valve, and the pressure switch valve are all connected to the air path between the valve front cylinder (20) and the valve rear cylinder (30); and pressure sensors (40) are installed at the air inlets of the air source cylinder (10), the valve front cylinder (20), and the valve rear cylinder (30).

2. The comprehensive test bench for pneumatic valves of screw pumps according to claim 1, characterized in that, An electromagnetic switch valve YA1 is installed in the air path between the air source cylinder (10) and the valve front cylinder (20).

3. The comprehensive test bench for pneumatic valves of screw pumps according to claim 2, characterized in that, The test air path of the safety valve is connected to the air path of the solenoid switch valve YA1 and the air source cylinder (10); and the solenoid switch valve YA2 is installed on the test air path.

4. The comprehensive test bench for pneumatic valves of screw pumps according to claim 2, characterized in that, A first throttle valve (12) is installed in the air path between the electromagnetic switch valve YA1 and the cylinder (20) before the valve.

5. The comprehensive test bench for pneumatic valves of screw pumps according to claim 2, characterized in that, The air source cylinder (10) is connected to the air source.

6. The comprehensive test bench for pneumatic valves of screw pumps according to claim 1, characterized in that, A solenoid switch valve YA3 is installed on the test branch of the pressure maintaining valve; a solenoid switch valve YA4 is installed on the air line connected to the air line of the air line of the air line of the air line of the air line of the air line of the air line of the air line of the air line of the air line of the air line of the air line of the air line of the air line of the air line of the air line of the air line of the air line of the air line of the air line of the air line of the pressure switch valve; a solenoid switch valve YA6 is installed on the test branch of the pressure switch valve.

7. The comprehensive test bench for pneumatic valves of screw pumps according to claim 6, characterized in that, A second throttle valve (23) is provided in the air path between the pre-valve cylinder (20) and the post-valve cylinder (30); the test branch air path of the pressure maintaining valve, the intake valve, the pressure switch valve and the safety valve to be tested is provided in the air path between the pre-valve cylinder (20) and the second throttle valve (23).

8. The comprehensive test bench for pneumatic valves of screw pumps according to claim 1, characterized in that, The comprehensive test bench for pneumatic valves of screw pumps also includes a PLC system; the electromagnetic switch valves and pressure sensors (40) on multiple electromagnetic switch valves, air source cylinders (10), valve front cylinders (20), valve rear cylinders (30) are all connected to the PLC system.

9. The comprehensive test bench for pneumatic valves of screw pumps according to claim 8, characterized in that, The integrated test bench for screw pump pneumatic valves also includes a display screen (50); the display screen (50) is connected to the PLC system.

10. A screw pump, characterized in that, The test was conducted using the comprehensive test bench for screw pump pneumatic valves as described in any one of claims 1-9.

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