Gas water ring vacuum pump flow detection device

Abstract

The utility model discloses a gas water ring vacuum pump flow detection device which comprises an external pipe, three-way valves, branch pipes and a detection structure, one ends of the two branch pipes are connected with the external pipe through one three-way valve, and the other ends of the two branch pipes are connected with a gas inlet of a vacuum pump through the other three-way valve; the two detection structures are arranged on the two branch pipes respectively, each detection structure comprises an annular plate, a first pressure sensor, a second pressure sensor and a controller, and the annular plates are arranged in the corresponding branch pipes; the first pressure sensor and the second pressure sensor are arranged on the branch pipes on the two sides of the annular plate correspondingly. And the first pressure sensor and the second pressure sensor are respectively connected with the controller. Flexible switching of the flow direction is achieved through the three-way valve, mutual calibration can be conducted on the detection structures on the two branch pipes at regular intervals, and meanwhile one detection structure can be maintained or replaced under the condition that a machine is not stopped.

Description

TECHNICAL FIELD

[0001] The utility model relates to water ring vacuum pump technical field especially relates to a gas water ring vacuum pump flow detection device. BACKGROUND

[0002] In the application of gas water ring vacuum pump, flow detection is crucial to ensure the safe operation and optimization performance of the system.

[0003] In the related art, the traditional gas water ring vacuum pump flow detection device usually adopts single pipeline design and monitors the gas flow through a single detection structure.

[0004] However, such design has some significant limitations, for example, there is no calibration mechanism, and the detection structure is single, once the sensor deviates, it is difficult to find and correct in time, and when the detection structure is repaired and replaced, due to the single pipeline design, shutdown operation is required, which causes the production process to be interrupted and reduces the work efficiency. SUMMARY

[0005] The utility model aims at solving one of the above technical problems at least to some extent.

[0006] To achieve the above purpose, the utility model discloses a gas water ring vacuum pump flow detection device, which comprises an external pipe, a three-way valve, a branch pipe and a detection structure, wherein one end of two branch pipes is connected with the external pipe through a three-way valve, and the other end of the two branch pipes is connected with the gas inlet of the vacuum pump through another three-way valve; two detection structures are arranged on the two branch pipes respectively, each detection structure comprises a ring plate, a first pressure sensor, a second pressure sensor and a controller, wherein the ring plate is arranged in the corresponding branch pipe; the first pressure sensor and the second pressure sensor are arranged on the branch pipes on the two sides of the ring plate respectively; the first pressure sensor and the second pressure sensor are connected with the controller respectively.

[0007] In addition, the gas water ring vacuum pump flow detection device according to the utility model can have the following additional technical features.

[0008] As a further description of the above technical scheme: the ring plate is perpendicular to the branch pipe, and the outer ring of the ring plate is connected with the inner wall of the branch pipe.

[0009] As a further description of the above technical scheme: the ring plate is perpendicular to the branch pipe, and the outer ring of the ring plate is connected with the inner wall of the branch pipe.

[0010] As a further description of the above technical solution: the three-way valve is provided with a valve switch.

[0011] As a further description of the above technical solution: the first pressure sensor and the second pressure sensor are both piezoelectric pressure sensors.

[0012] As a further description of the above technical solution: the detection structure further comprises a temperature sensor, which is arranged on the corresponding branch pipe and electrically connected with the controller, and a detection end of the temperature sensor extends into the branch pipe.

[0013] As a further description of the above technical solution: a filter is arranged in the pipeline of the external connecting pipe to filter impurity particles in the gas.

[0014] As a further description of the above technical solution: the controller is connected with a display screen for displaying the pressure values of the first pressure sensor and the second pressure sensor and the flow data calculated from the pressure difference in real time.

[0015] The gas water ring vacuum pump flow detection device according to the present application can realize flexible switching of the flow direction through the three-way valve, can not only periodically calibrate the detection structures on the two branch pipes with each other, but also can ensure that one detection structure is in working state in daily operation, provides higher redundancy and reliability, and can maintain or replace one detection structure without stopping the machine, thereby greatly improving the usability and maintenance convenience of the system.

[0016] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0018] Figure 1 is a structural schematic view of a gas water ring vacuum pump flow detection device according to an embodiment of the present application;

[0019] Figure 2 is a top view schematic view of a gas water ring vacuum pump flow detection device according to an embodiment of the present application;

[0020] Figure 3 is a schematic view of the internal structure of a detection structure according to an embodiment of the present application;

[0021] Figure 4 is a schematic view of the structure of a ring plate according to an embodiment of the present application;

[0022] As shown in the figure:

[0023] 100, external pipe; 200, three-way valve; 201, valve switch; 300, branch pipe; 400, detection structure; 410, ring plate; 411, flow-through port; 412, flow-through hole; 420, first pressure sensor; 430, second pressure sensor; 440, controller; 450, temperature sensor; 500, vacuum pump; 501, air inlet. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0025] The gas water ring vacuum pump flow detection device of the present application is described below in conjunction with the drawings.

[0026] As Figure 1 and Figure 2 shown, the gas water ring vacuum pump flow detection device of the present application can include an external pipe 100, a three-way valve 200, a branch pipe 300, and a detection structure 400.

[0027] Among them, one end of the two branch pipes 300 is connected to the external pipe 100 through a three-way valve 200, and the other end of the two branch pipes 300 is connected to the air inlet 501 of the vacuum pump 500 through another three-way valve 200.

[0028] Two detection structures 400 are respectively arranged on the two branch pipes 300.

[0029] As Figure 3 shown, each detection structure 400 includes a ring plate 410, a first pressure sensor 420, a second pressure sensor 430, and a controller 440.

[0030] Among them, the ring plate 410 is arranged in the corresponding branch pipe 300, the first pressure sensor 420 and the second pressure sensor 430 are arranged on the branch pipe 300 on both sides of the ring plate 410, and the first pressure sensor 420 and the second pressure sensor 430 are respectively connected to the controller 440.

[0031] Specifically, when the flow detection is performed, after the gas enters from the external pipe 100, according to the initial setting of the three-way valve 200, the gas flows into one of the branch pipes 300 (assuming it is branch pipe A).

[0032] In branch pipe A, when the gas flows through the ring plate 410, its flow rate changes due to the throttling effect of the ring plate 410. According to Bernoulli's principle, the change in flow rate will cause a change in pressure, resulting in a pressure difference on both sides of the ring plate 410. The first pressure sensor 420 and the second pressure sensor 430 measure the pressure values on both sides of the ring plate 410 and transmit these pressure data to the controller 440.

[0033] The controller 440 has a pre-stored corresponding relationship model between pressure difference and flow rate, which is obtained through a large number of experiments and theoretical calculations on the gas water ring vacuum pump and the detection device under various working conditions. The controller 440 calculates the gas flow rate in branch pipe A according to the received pressure difference data using this corresponding relationship model, and can store, display or transmit the flow rate data to other monitoring systems.

[0034] To ensure the accuracy of the detection structure 400, it needs to be calibrated periodically. When calibrating, the three-way valve 200 is operated to switch the gas flow to the other branch pipe 300 (assuming branch pipe B). At this time, the detection structure 400 on branch pipe B starts to work and measures the pressure difference on both sides of the ring plate 410 and calculates the flow rate.

[0035] By comparing the flow rate data measured and calculated by the detection structures 400 on branch pipes A and B, if the deviation is within the pre-set allowable range, it means that both detection structures 400 are working normally and no adjustment is needed.

[0036] If the deviation exceeds the allowable range, it may be that the pressure sensor of one of the detection structures 400 has drifted, the ring plate 410 has dirt affecting the throttling effect, etc. Further inspection and maintenance are needed. Through this regular calibration, possible problems of the detection structure 400 can be found in time to ensure the accuracy of flow detection.

[0037] When one of the detection structures 400 on one of the branch pipes 300 (such as branch pipe A) needs to be repaired or replaced, the three-way valve 200 is used to completely switch the gas flow to branch pipe B. In this way, the detection structure 400 on branch pipe B works normally, and the detection structure 400 on branch pipe A can be repaired or replaced.

[0038] For example, if the first pressure sensor 420 on branch pipe A fails, the flow can be switched to branch pipe B without stopping, and the faulty pressure sensor on branch pipe A can be safely removed and replaced. After replacement, the calibration operation is performed to check whether it returns to the normal working state.

[0039] This design greatly improves the usability and maintenance convenience of the system, avoids the interruption of the production process caused by the shutdown maintenance of the detection structure 400, reduces the production loss, and improves the work efficiency.

[0040] In an embodiment of the present application, the ring plate 410 is arranged perpendicular to the branch pipe 300, and the outer ring of the ring plate 410 is connected to the inner wall of the branch pipe 300.

[0041] As a possible case, as shown in Figure 4 The ring plate 410 is provided with an elliptical flow-through opening 411 in the center, and a plurality of flow-through holes 412 are arranged around the flow-through opening 411 to cooperate with the flow-through opening 411, reduce vortex and pressure loss, and improve measurement accuracy.

[0042] It should be noted that the elliptical flow-through opening 411 provides a smoother boundary condition, so that the fluid (in this case, gas) can flow more smoothly through the flow-through opening 411, and the elliptical shape can make the fluid gradually shrink from the wider end to the narrower end, and then expand out. This gradual change helps to reduce the sudden change of the fluid when passing through the flow-through opening 411, thereby reducing the probability of turbulence and vortex.

[0043] When the fluid passes through a non-smooth or sharply changing cross-section, it is easy to produce a separation point on the surface of the object, that is, the fluid no longer flows closely to the surface of the object, but forms eddies or recirculation zones. These eddies increase local resistance and cause energy loss, so the elliptical design can reduce such separation points through its smooth curve

[0044] Specifically, when the gas flows from the branch pipe 300 to the ring plate 410, the flow rate and pressure of the gas are in a relatively uniform initial state before approaching the ring plate 410. As the gas reaches the ring plate 410, a portion of the gas begins to pass through the elliptical flow-through opening 411. Due to the throttling effect of the flow-through opening 411, the flow rate of this portion of the gas will increase, and according to Bernoulli's principle, the static pressure of the gas will decrease at the same time, thereby generating a pressure difference before and after the flow-through opening 411.

[0045] At the same time, another portion of the gas passes through the flow-through holes 412 around the flow-through opening 411. These flow-through holes 412 evenly distribute part of the gas flow, so that the flow rate of the gas in the entire ring plate 410 area changes more smoothly, avoiding the unstable flow field phenomena that may occur only by relying on the flow-through opening 411, such as local flow rate being too high, pressure suddenly changing, and a large amount of vortex being generated subsequently.

[0046] The first pressure sensor 420 and the second pressure sensor 430 are located on two sides of the ring plate 410 respectively, and in the above stable and optimized flow field environment, the real pressure difference generated by the gas flowing through the ring plate 410 can be more accurately measured, and since the interference factors such as vortex are reduced, the measured pressure difference data fluctuation is smaller, and the corresponding relationship between the gas flow and the pressure change under the joint action of the flow-through port 411 and the flow-through hole 412 can be more accurately reflected, so that the measurement accuracy is improved.

[0047] In an embodiment of the present application, the valve switch 201 is arranged on the three-way valve 200.

[0048] As a possible case, the valve switch 201 is a handwheel type switch, and relevant personnel can control the opening and closing state of the three-way valve 200 by holding the handwheel and rotating.

[0049] As another possible case, the valve switch 201 is an electromagnetic switch, and relevant personnel can control the opening and closing of the electromagnetic switch by controlling the switch.

[0050] In an embodiment of the present application, the first pressure sensor 420 and the second pressure sensor 430 are both piezoelectric pressure sensors.

[0051] It should be noted that the piezoelectric pressure sensor works based on the piezoelectric effect, and when the piezoelectric material (commonly quartz crystal, piezoelectric ceramic, etc.) is subjected to external force and mechanical deformation, polarization phenomenon occurs inside, and then equal and opposite charges appear on the two opposite surfaces of the material, forming a potential difference. When this piezoelectric material is applied to a pressure sensor, external pressure acts on the sensitive element of the sensor, causing the piezoelectric material to deform, thereby generating an electric signal (voltage signal) proportional to the pressure.

[0052] For example, when the gas flows through the ring plate 410 to generate a pressure difference in the branch pipe 300 of the vacuum pump 500 flow detection device, the pressure difference will exert different pressures on the piezoelectric elements of the first pressure sensor 420 and the second pressure sensor 430, and then cause the piezoelectric elements to deform accordingly, generating corresponding electric signals to reflect the pressure conditions on both sides of the ring plate 410.

[0053] In an embodiment of the present application, as shown in Figure 3 The detection structure 400 further includes a temperature sensor 450, which is arranged on the corresponding branch pipe 300 and electrically connected to the controller 440, and the detection end of the temperature sensor 450 extends into the branch pipe 300.

[0054] It should be noted that, due to the diverse working environment of the vacuum pump 500, such as in different seasons, different industrial production scenes, the external environment temperature and the heat transfer during the operation of the pump body, etc. Factors such as the temperature of the gas in the pipe will change.

[0055] The temperature sensor 450 can accurately perceive these temperature changes through a thermosensitive element (such as a commonly used thermal resistance, thermocouple, etc. which will change its resistance value or generate different thermoelectric potentials with temperature changes), and convert them into corresponding electrical signals (such as voltage or current signals).

[0056] There is a close physical relationship between the flow rate of the gas and the temperature. According to the ideal gas state equation and the principle of fluid mechanics, the density, viscosity and other physical properties of the gas will change with the temperature, and these properties will affect the pressure difference generated when the gas passes through the ring plate 410 and the accuracy of the entire flow detection.

[0057] For example, when the temperature rises, the density of the gas will decrease, and under the same pressure difference, its actual flow rate will be different from that at low temperature.

[0058] When the temperature sensor 450 detects the temperature of the gas in the pipe, it transmits the temperature signal to the controller 440, which internally pre-stores a flow calculation correction algorithm that takes into account the temperature influence (this algorithm is based on a large amount of experimental data and theoretical derivation). After receiving the temperature signal, the controller 440 will compensate and correct the flow value calculated according to the pressure difference according to this algorithm, so as to eliminate the influence of temperature factors on the flow detection accuracy, so that the final flow data is more accurate and reliable, and high-precision detection of the flow of the vacuum pump 500 can be realized under high-temperature or low-temperature working conditions.

[0059] In an embodiment of the present application, a filter is arranged in the pipeline of the external pipe 100 to filter impurity particles in the gas, so as to prevent the impurities from entering the vacuum pump 500 and causing damage to the pump body.

[0060] In an embodiment of the present application, the controller 440 is connected with a display screen for displaying the pressure values of the first and second pressure sensors 420 and 430 and the flow data calculated from the pressure difference in real time, so that the relevant staff can intuitively observe the data changes.

[0061] In conclusion, the gas water ring vacuum pump flow detection device according to the embodiment of the utility model, through three-way valve 200 realizes the flexible switching of flow direction, not only can regularly mutually calibrate the detection structure 400 on two branch pipes 300, still can guarantee in daily operation always have a detection structure 400 in working condition, provided higher redundancy and reliability, can simultaneously carry out maintenance or replacement to one of detection structure 400 under the condition of not stopping, greatly improved the availability and maintenance convenience of system.

[0062] In the description of the present specification, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0063] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0064] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A gas water ring vacuum pump flow rate detection device characterized by comprising: The utility model relates to a kind of vacuum pumping system, including: Outer connecting pipe (100), three-way valve (200), branch pipe (300) and detection structure (400), wherein, Two ends of two branch pipes (300) are connected with outer connecting pipe (100) by one three-way valve (200), and the other end of two branch pipes (300) is connected with the gas inlet (501) of vacuum pump (500) by another three-way valve (200); Two detection structures (400) are respectively arranged on two branch pipes (300), and each detection structure (400) includes ring plate (410), first pressure sensor (420), second pressure sensor (430) and controller (440), wherein, Ring plate (410) is arranged in corresponding branch pipe (300); First pressure sensor (420) and second pressure sensor (430) are arranged on branch pipe (300) on both sides of ring plate (410) respectively; First pressure sensor (420) and second pressure sensor (430) are connected with controller (440) respectively.

2. The gas water ring vacuum pump flow rate detecting device according to claim 1, characterized by Ring plate (410) is arranged perpendicularly to branch pipe (300), and the outer ring of ring plate (410) is connected with the inner wall of branch pipe (300).

3. The gas water ring vacuum pump flow rate detecting device according to claim 1, wherein Flow-through port (411) is formed in the center of ring plate (410), and flow-through port (411) is oval, a plurality of flow-through holes (412) are formed in the outer ring of flow-through port (411), to reduce vortex and pressure loss, improve measurement accuracy.

4. The gas water ring vacuum pump flow rate detecting device according to claim 1, wherein Valve switch (201) is arranged on three-way valve (200).

5. The gas water ring vacuum pump flow rate detecting device as claimed in claim 1, wherein First pressure sensor (420) and second pressure sensor (430) are both piezoelectric pressure sensors.

6. The gas water ring vacuum pump flow rate detecting device as claimed in claim 1, wherein Detection structure (400) further includes temperature sensor (450), temperature sensor (450) is arranged on corresponding branch pipe (300), and is electrically connected with controller (440), and the detection end of temperature sensor (450) extends into branch pipe (300).

7. The gas water ring vacuum pump flow rate detecting device as claimed in claim 1, wherein Filter is arranged in the pipeline of outer connecting pipe (100) to filter impurity particles in gas.

8. The gas water ring vacuum pump flow rate detecting device as claimed in claim 1, wherein Controller (440) is connected with display screen, to display the pressure value of first pressure sensor (420) and second pressure sensor (430) and flow data calculated by pressure difference in real time.

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