Fluid pressure difference detection device

Abstract

The utility model discloses a fluid pressure difference detection device which comprises a main pipeline and a bypass pipeline, a bypass liquid inlet is formed in the front side of the main pipeline, a bypass liquid outlet is formed in the rear side of the main pipeline, the bypass pipeline comprises an impeller type fluid measuring device, and the impeller type fluid measuring device comprises an impeller shell, an impeller, a magnet and a magnetic inductor. An impeller in running fit with the impeller shell is arranged in the impeller shell, a magnet is mounted on the impeller, the magnet is matched with the magnetic inductor, a first liquid inlet and a first liquid outlet are formed in the impeller shell, the first liquid inlet is communicated with a bypass liquid inlet, the first liquid outlet is communicated with a bypass liquid outlet, and the second liquid inlet is communicated with the bypass liquid outlet. The device has the advantages of simple structure, low cost, good detection effect, long service life, strong applicability and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid differential pressure detection, and particularly relates to a fluid differential pressure detection device. Background Art

[0002] In the prior art, the flow rate of pipeline medium is usually calculated by using a pressure transmitter to measure the pressures at both ends before and after the main pipeline valve respectively. According to the measured differential pressure at both ends before and after the valve, the known pipeline cross-sectional area, the known valve opening degree, etc., the flow rate of the medium in the pipeline can be calculated. This method uses a pressure detection sensor with a high price, increasing the equipment manufacturing and maintenance costs. Content of the Utility Model

[0003] The purpose of the utility model is to solve the deficiencies of the above-mentioned prior art, and provide a fluid differential pressure detection device with simple structure, low cost, good detection effect, long service life and strong applicability.

[0004] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0005] A fluid differential pressure detection device, characterized in that: it includes a main pipeline and a bypass pipeline. A bypass liquid inlet is arranged on the front side of the main pipeline, and a bypass liquid outlet is arranged on the rear side. The bypass pipeline includes an impeller type fluid measurement device. The impeller type fluid measurement device includes an impeller housing, an impeller, a magnet and a magnetic inductor. An impeller rotatably matched with the impeller housing is arranged in the impeller housing. A magnet is installed on the impeller. The magnet is matched with the magnetic inductor. A liquid inlet 1 and a liquid outlet 1 are arranged on the impeller housing;

[0006] The liquid inlet 1 is communicated with the bypass liquid inlet, and the liquid outlet 1 is communicated with the bypass liquid outlet;

[0007] When the fluid in the main pipeline flows, part of the fluid enters the bypass pipeline. The rotation of the impeller is driven by the fluid flow. The magnet follows the impeller to do circular motion. When the impeller rotates, the magnetic inductor will sense the change of the magnetic field of the magnet and convert these changes into electrical signals, and the rotation speed of the impeller can be measured. Finally, the differential pressure of the main pipeline at the corresponding position can be determined. The structure is simple and the cost is low.

[0008] The bypass pipeline of the utility model further includes a liquid inlet filtering device, which is arranged between the bypass liquid inlet and the liquid inlet 1 of the impeller housing; it can filter the impurities entering the bypass pipeline, prevent the impurities from affecting the rotation of the impeller, the measurement of the rotation speed and the corrosion of the impeller, ensure the measurement effect and measurement accuracy, can be applicable to a variety of working conditions, has a wide application range, and the impeller has a long service life.

[0009] The liquid inlet filtering device of the present utility model comprises a liquid inlet housing and a filtering element. A second liquid inlet and a second liquid outlet are formed in the liquid inlet housing. The second liquid inlet is communicated with a bypass liquid inlet, and the second liquid outlet is communicated with a first liquid inlet of an impeller housing. The filtering element is arranged in the liquid inlet housing.

[0010] The bypass pipeline of the present utility model further comprises a liquid outlet device, which is arranged between the bypass liquid outlet and the first liquid outlet of the impeller housing.

[0011] The liquid inlet filtering device further comprises a fluid locking mechanism. The liquid inlet housing is provided with an upper opening, and a liquid inlet upper cover is covered at the upper opening. The fluid locking mechanism comprises a flow blocking sleeve, a connecting shaft, a connecting sleeve and a flow blocking plug. The flow blocking sleeve extends into the liquid inlet housing, and the lower end is communicated with the second liquid inlet of the liquid inlet housing. A diversion groove is formed in the flow blocking sleeve. The filtering element is in a cylindrical mesh structure and is sleeved outside the flow blocking sleeve.

[0012] The connecting shaft, the connecting sleeve and the flow blocking plug are arranged in the flow blocking sleeve. The connecting sleeve is provided with internal threads, and the connecting shaft is provided with external threads. The connecting sleeve is in threaded connection with the connecting shaft. One of the connecting sleeve and the connecting shaft is in vertical sliding fit with the flow blocking sleeve and the lower end is connected with the flow blocking plug. The other of the connecting sleeve and the connecting shaft rotates to drive one of the connecting sleeve and the connecting shaft and the flow blocking plug to move vertically. The flow blocking plug is inserted into the second liquid inlet of the liquid inlet housing.

[0013] The liquid outlet device comprises a liquid outlet housing and a fluid locking mechanism. The liquid outlet housing is provided with an upper opening, a third liquid inlet and a third liquid outlet. A liquid outlet upper cover is covered at the upper opening. The third liquid inlet is communicated with the first liquid outlet of the impeller housing, and the third liquid outlet is communicated with the bypass liquid outlet. The fluid locking mechanism comprises a flow blocking sleeve, a connecting shaft, a connecting sleeve and a flow blocking plug. The flow blocking sleeve extends into the liquid outlet housing, and the lower end is communicated with the third liquid outlet of the liquid outlet housing. A diversion groove is formed in the flow blocking sleeve.

[0014] The connecting shaft, the connecting sleeve and the flow blocking plug are arranged in the flow blocking sleeve. The connecting sleeve is provided with internal threads, and the connecting shaft is provided with external threads. The connecting sleeve is in threaded connection with the connecting shaft. The lower end of one of the connecting sleeve and the connecting shaft is connected with the flow blocking plug and is in vertical sliding fit with the flow blocking sleeve. The other of the connecting sleeve and the connecting shaft rotates to drive one of the connecting sleeve and the connecting shaft and the flow blocking plug to move vertically. The flow blocking plug is inserted into the third liquid outlet of the liquid outlet housing.

[0015] When it is necessary to clean the filtering element, first block the second liquid inlet through the fluid locking mechanism in the liquid inlet housing, block the third liquid outlet through the fluid locking mechanism in the liquid outlet housing, and block the inflow of the fluid, so as to facilitate opening the liquid inlet upper cover to take out the filtering element for cleaning. The structure is simple, the filtering element is convenient to clean, and the applicability is strong.

[0016] In the liquid outlet housing of the present utility model, a filter element is further provided, and the filter element is sleeved outside the flow blocking sleeve in a cylindrical mesh structure.

[0017] The lower end of the flow blocking sleeve in the liquid inlet housing of the present utility model is connected to the first liquid inlet pipe, and the first liquid inlet pipe is inserted into the second liquid inlet port;

[0018] The lower end of the flow blocking sleeve in the liquid outlet housing is connected to the second liquid outlet pipe, and the second liquid outlet pipe is inserted into the third liquid outlet port;

[0019] The first liquid inlet pipe communicates with the bypass liquid inlet port, and the second liquid outlet pipe communicates with the bypass liquid outlet port.

[0020] The first liquid inlet pipe of the present utility model is threadedly connected to the bypass liquid inlet port, and the second liquid outlet pipe is threadedly connected to the bypass liquid outlet port; it is convenient for installation, disassembly and maintenance.

[0021] In the impeller housing of the present utility model, an impeller shaft is provided, the impeller is sleeved on the impeller shaft, a convex portion extends upward along the axial direction of the impeller on the upper surface of the impeller hub, the position of the convex portion is higher than the impeller blades, and the magnet is installed on the convex portion; to prevent the fluid from corroding the magnet.

[0022] Between the inner wall of the impeller housing of the present utility model and the first liquid outlet port near the position of the first liquid outlet port, there is a rear guide slope with a smooth transition connection, and the rotation direction of the impeller is matched with the inclination direction of the rear guide slope.

[0023] The bypass pipeline of the present utility model is arranged in the outer housing, and the magnetic inductor is fixed inside the outer housing, and the position is close to the position of the magnet on the impeller.

[0024] The beneficial effects of the present utility model are: when the fluid in the main pipeline flows, part of the fluid enters the bypass pipeline, the rotation speed of the impeller can be measured through the impeller type fluid measuring device, and finally the pressure difference at the corresponding position of the main pipeline at this time can be determined. The structure is simple, the cost is low, and the detection method is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the bypass pipeline of the present utility model.

[0026] Figure 2 It is a top view of the overall structure of the bypass pipeline of the present utility model.

[0027] Figure 3 It is Figure 2 The A-A cross-sectional view in

[0028] Figure 4 It is a schematic diagram of the connection structure of the liquid inlet device, the impeller type fluid measuring device and the liquid outlet device.

[0029] Figure 5 It isFigure 4 Top view.

[0030] Figure 6 It is Figure 5 the sectional view taken along B-B in the figure.

[0031] Figure 7 It is a schematic structural diagram of an impeller type fluid measuring device.

[0032] Figure 8 It is Figure 7 Top view.

[0033] Figure 9 It is Figure 8 the sectional view taken along C-C in the figure.

[0034] Figure 10 It is a schematic structural diagram of the hidden impeller upper cover of an impeller type fluid measuring device.

[0035] Figure 11 It is a schematic structural diagram of a liquid inlet filtering device.

[0036] Figure 12 It is Figure 11 Top view.

[0037] Figure 13 It is Figure 12 the sectional view taken along D-D in the figure.

[0038] Figure 14 It is a schematic structural diagram of a fluid locking mechanism.

[0039] Figure 15 It is a sectional view of the liquid outlet device structure.

[0040] Figure 16 It is a schematic structural diagram of the connection between the main pipeline and the bypass pipeline.

[0041] Reference numerals: housing - 1;

[0042] impeller type fluid measuring device - 2, impeller housing - 201, liquid inlet 1 - 2011, liquid outlet 1 - 2012, impeller upper cover - 202, upper cover limiting ring - 2021, convex accommodating groove - 2022, impeller - 203, upper cover limiting groove - 2031, convex - 2032, impeller shaft - 204, magnet placement groove - 205, magnetic inductor - 206, front guide wall - 2071, front guide slope - 20711, rear guide wall - 2072, rear guide slope - 20721;

[0043] liquid inlet filtering device - 3, liquid inlet housing - 301, liquid inlet upper cover - 302, limiting ring - 3021, guide slope - 30211, liquid inlet pipe 1 - 3031, liquid outlet pipe 1 - 3032, liquid inlet filter screen - 304;

[0044] Liquid discharging device - 4, liquid discharging housing - 401, upper liquid discharging cover - 402, second liquid inlet pipe - 4031, second liquid discharging pipe - 4032, liquid discharging filter screen - 404;

[0045] O - ring seal - 5;

[0046] Fluid locking mechanism - 6, flow - blocking sleeve - 601, guiding groove - 6011, outer limiting boss - 6012, inner limiting boss - 6013, diversion groove - 6014, filter screen limiting block - 6015, connecting sleeve - 6021, flow - blocking plug - 6022, guiding block - 6023, connecting shaft - 603, shaft head - 6031, slot - 6032, clamp - 604;

[0047] Main pipeline - 7, bypass liquid inlet - 701, bypass liquid outlet - 702. Specific embodiments

[0048] The present utility model will be described below with reference to the accompanying drawings and embodiments.

[0049] As shown in the Figure 1-15 accompanying drawings, the bypass pipeline includes a liquid inlet filtering device 3 and an impeller - type fluid measuring device 2. The impeller - type fluid measuring device 2 includes an impeller housing, an impeller 203, a magnet, and a magnetic inductor 206. The impeller housing is provided with a first liquid inlet 2011 and a first liquid outlet 2012. The first liquid inlet 2011 of the impeller housing is communicated with the liquid inlet filtering device. An impeller 203 rotatably matched with the impeller housing is arranged in the impeller housing. A magnet is installed on the impeller 203. The magnet is matched with the magnetic inductor 206. The magnetic inductor 206 is connected to a controller. In this embodiment, the controller can be a PLC controller or a controller developed based on an MCU;

[0050] The rotation of the impeller 203 is driven by the fluid flow. The magnet follows the impeller 203 to perform a circular motion. When the impeller rotates, the magnetic inductor 206 will sense the magnetic field change of the magnet and convert these changes into electrical signals, so as to measure the rotation speed of the impeller 203. The setting of the liquid inlet filtering device 3 can first filter out impurities in the fluid, prevent the impurities from affecting the rotation of the impeller 203, the measurement of the rotation speed, and the corrosion of the impeller 203, ensure the measurement effect and measurement accuracy, can be applicable to a variety of working conditions, has a wide application range, and the impeller 203 has a long service life.

[0051] As shown in the Figure 7-10 accompanying drawings, the impeller housing 201 is provided with an upper opening, and an impeller upper cover 202 is covered at the upper opening. An O - ring seal 5 is sleeved at the upper opening to ensure the sealing performance after the impeller upper cover 202 is covered. The impeller upper cover 202 is fixed to the impeller housing 201 by bolts.

[0052] The impeller housing 201 is provided with an impeller 203. The impeller 203 is sleeved on the impeller shaft 204 and fixedly or rotatably connected to the impeller shaft 204. An annularly arranged protrusion 2032 extends upward on the upper surface of the hub of the impeller 203 near the impeller shaft 204. A magnet placement groove 205 is formed on the upper surface of the protrusion 2032, and the magnet is placed in the magnet placement groove 205. An annularly arranged upper cover limiting groove 2031 is formed downward on the upper surface of the hub of the impeller 203 outside the protrusion 2032.

[0053] In the middle of the impeller upper cover 202, a protrusion receiving groove 2022 with a downward opening extends upward. The protrusion 2032 is inserted into the protrusion receiving groove 2022. The impeller upper cover 202 further extends upward in the protrusion receiving groove 2022 to form an upper limit groove for the impeller shaft. The bottom of the impeller housing 201 is provided with a lower limit groove for the impeller shaft. In this embodiment, the impeller 203 is in rotational cooperation with the impeller shaft 204. The upper end of the impeller shaft 204 is inserted into the upper limit groove for the impeller shaft, and the lower end is inserted into the lower limit groove for the impeller shaft; it is convenient for assembly and maintenance.

[0054] On the inner wall of the impeller upper cover 202, an upper cover limiting ring 2021 extends downward on the outer periphery of the protrusion receiving groove 2022. The position of the upper cover limiting ring 2021 is matched with the position of the upper cover limiting groove 2031. When the impeller upper cover 202 covers the upper opening, the protrusion 2032 is inserted into the protrusion receiving groove 2022, and the upper cover limiting ring 2021 is inserted into the upper cover limiting groove 2031; the cooperation between the upper cover limiting ring 2021 and the upper cover limiting groove 2031 not only facilitates the positioning and installation of the impeller upper cover 202, but also can further effectively block the fluid in the impeller housing 201 from splashing onto the magnet through the upper cover limiting ring 2021.

[0055] The inner wall of the impeller housing 201 is fixed with a front guide wall 2071 and a rear guide wall 2072. The front guide wall 2071 and the rear guide wall 2072 are arranged in an arc shape, and the arc opening faces the impeller 203 in the middle. The front guide wall 2071 and the rear guide wall 2072 are arranged opposite to each other front and back. A left opening communicating with the first liquid inlet 2011 is formed between the left sides of the front guide wall 2071 and the rear guide wall 2072. A right opening communicating with the first liquid outlet 2012 is formed between the right sides of the front guide wall 2071 and the rear guide wall 2072;

[0056] The rear guide wall 2072 forms a rear guide inclined surface 20721 that is smoothly connected to the first liquid outlet 2012 at the right opening. The front guide wall 2071 forms a front guide inclined surface 20711 that is parallel to the rear guide inclined surface 20721 at the right opening;

[0057] The rotation direction of the impeller is matched with the inclination direction of the rear guide inclined surface 20721;

[0058] The setting of the rear diversion inclined plane 20721 and its cooperation with the front diversion inclined plane 20711 enable the fluid to flow out smoothly through this inclined plane from the liquid outlet, ensuring the efficiency of the impeller and the accuracy of the magnetic inductor detection.

[0059] In this embodiment, the inclination direction of the rear diversion inclined plane 20711 is tangent to the outer circle of the impeller; this direction is the tangent direction of the maximum force arm of the impeller, further enabling the impeller to have higher efficiency and ensuring the accuracy of the magnetic inductor detection.

[0060] As shown in the Figure 11-14 accompanying drawings, the liquid inlet filtering device 3 includes a liquid inlet housing 301 and a liquid inlet filter screen 304. The liquid inlet housing 301 is provided with a second liquid inlet and a second liquid outlet. In this embodiment, the second liquid inlet is located at the bottom of the liquid inlet housing 301, and the second liquid outlet is located on the side wall of the liquid inlet housing 301. A first liquid outlet pipe 3032 is connected to the second liquid outlet of the liquid inlet housing. An O-shaped sealing ring 5 is sleeved at the connection between the first liquid outlet pipe 3032 and the second liquid outlet to ensure the sealing of the liquid outlet. The first liquid outlet pipe 3032 is communicated with the first liquid inlet 2011 of the impeller housing. The liquid inlet filter screen 304 is arranged in the liquid inlet housing 301 and is used to filter impurities in the fluid.

[0061] The liquid inlet housing 301 is provided with an upper opening, and an upper liquid inlet cover 302 is covered at the upper opening. In this embodiment, the upper liquid inlet cover 302 is fixed to the liquid inlet housing by bolts, and an O-shaped sealing ring is sleeved at the upper opening to achieve sealing with the upper liquid inlet cover. A fluid locking mechanism 6 is arranged in the liquid inlet housing 301. The fluid locking mechanism 6 includes a flow blocking sleeve 601, a connecting shaft 603, a connecting sleeve 6021, and a flow blocking plug 6022. The lower end of the flow blocking sleeve 601 is communicated with the second liquid inlet of the liquid inlet housing 301. A plurality of diversion grooves 6014 are formed in the flow blocking sleeve 601. The liquid inlet filter screen 304 is in a cylindrical mesh structure and is sleeved outside the flow blocking sleeve 601;

[0062] The connecting shaft 603, the connecting sleeve 6021, and the flow blocking plug 6022 are arranged in the flow blocking sleeve 601. The connecting sleeve 6021 is provided with internal threads, and the connecting shaft 603 is provided with external threads. The connecting shaft 603 is in threaded connection with the connecting sleeve 6021. One of the connecting sleeve 6021 and the connecting shaft 603 is in vertical sliding fit with the flow blocking sleeve 601 and is connected to the flow blocking plug 6022 at the lower end. The other of the connecting sleeve 6021 and the connecting shaft 603 rotates to drive one of the connecting sleeve and the connecting shaft and the flow blocking plug 6022 to move vertically. The flow blocking plug 6022 is inserted into the second liquid inlet of the liquid inlet housing 301.

[0063] In this embodiment, a flow-blocking plug 6022 is fixedly connected to the lower end of the connecting sleeve 6021. The flow-blocking plug 6022 is arranged in an inverted conical shape. A guiding block 6023 is fixedly connected to the side wall of the connecting sleeve 6021. A vertically arranged guiding groove 6011 is formed on the flow-blocking sleeve 601. The guiding block 6023 is in vertical sliding fit with the guiding groove 6011. By rotating the connecting shaft 603, the connecting sleeve 6021 and the flow-blocking plug 6022 are driven to move up and down.

[0064] A through hole penetrating up and down is formed in the liquid inlet upper cover 302. The flow-blocking sleeve 601 is inserted into the liquid inlet housing 301 through the through hole. An O-ring seal is arranged between the flow-blocking sleeve 601 and the through hole. An inner limiting boss 6013 is formed by radially inward extension at the upper end inside the flow-blocking sleeve 601. A circumferentially arranged limiting groove is formed on the inner wall of the upper end of the flow-blocking sleeve 601 above the inner limiting boss 6013.

[0065] The lower end of the flow-blocking sleeve 601 is connected to the first liquid inlet pipe 3031. The first liquid inlet pipe 3031 is inserted into the second liquid inlet. An O-ring seal 5 is arranged between the first liquid inlet pipe 3031 and the second liquid inlet. An outer limiting boss 6012 is formed by radially outward extension at the lower end of the flow-blocking sleeve 601. The outer limiting boss 6012 abuts against the inside of the liquid inlet housing 301. By connecting the flow-blocking sleeve 601 and the first liquid inlet pipe 3031, the on-off of the fluid in the first liquid inlet pipe can be controlled by the flow-blocking plug 6022. The cooperation of the flow-blocking sleeve 601, the first liquid inlet pipe 3031 and the outer limiting boss 6012 is convenient for assembly and can limit the position of the flow-blocking sleeve 601, and at the same time can ensure the sealing performance with the housing.

[0066] A filter screen limiting block 6015 is formed by radially outward extension on the outer limiting boss 6012 at the lower end of the flow-blocking sleeve 601. The outer diameter of the filter screen limiting block 6015 is smaller than the outer diameter of the outer limiting boss 6012. A guiding inclined surface inclined outward from top to bottom is arranged on the outer periphery of the filter screen limiting block 6015. The liquid inlet filter screen is sleeved outside the filter screen limiting block 6015. The filter screen limiting block 6015 can not only limit the liquid inlet filter screen, but also play a guiding role in the installation of the liquid inlet filter screen, which is convenient for the installation of the liquid inlet filter screen.

[0067] A shaft head 6031 is formed by radially outward extension at the upper end of the connecting shaft 603. The connecting shaft 603 is inserted into the flow-blocking sleeve. The lower end surface of the shaft head 6031 abuts against the inner limiting boss. The upper end surface of the shaft head 6031 is limited by a clamp 604 stuck in the limiting groove. The position of the shaft head 6031 is limited to ensure that the shaft head 6031 will not move up and down, and it is convenient for installation and disassembly during assembly.

[0068] A slot 6032 or a handle is provided on the shaft head 6031; it is convenient for the shaft head to rotate and drive the flow-blocking plug to move. By rotating the shaft head 6031, the flow-blocking plug 6022 is driven to control the on-off of the fluid. The structure is simple and the operation is convenient.

[0069] In this embodiment, a slot 6032 is formed on the shaft head 6031. The slot 6032 is a hexagonal hole. An inner hexagon wrench is inserted into the hexagonal hole, and the rotation of the inner hexagon wrench drives the connecting shaft to rotate; the slot can also be a long slot. A flat-blade screwdriver is inserted into the long slot, and the rotation of the flat-blade screwdriver drives the connecting shaft to rotate.

[0070] An O-ring seal is sleeved between the shaft head and the flow-blocking sleeve 601 to ensure the sealing effect.

[0071] In this embodiment, a circumferentially arranged limit ring 3021 is fixed on the lower surface of the liquid inlet upper cover 302. The liquid inlet upper cover 302 covers the upper opening of the liquid inlet housing 301. The limit ring 3021 is inserted into the upper opening. The outer wall of the limit ring 3021 abuts against the inner wall of the liquid inlet housing 301. An O-ring seal 5 is provided between the outer wall of the limit ring 3021 and the inner wall of the housing.

[0072] The upper end of the liquid inlet filter screen 304 is located between the limit ring 3021 and the flow-blocking sleeve 601, and the lower end is sleeved outside the filter screen limit block 6015. The upper surface of the liquid inlet filter screen 304 abuts against the lower surface of the liquid inlet upper cover 302, and the lower surface of the liquid inlet filter screen 304 abuts against the upper surface of the outer limit boss 6012.

[0073] The setting of the limit ring 3021 can not only limit the liquid inlet upper cover 302 to ensure that the liquid inlet upper cover 302 is accurately covered on the upper opening position of the housing, but also cooperate with the filter screen limit block 6015 to limit the liquid inlet filter screen 304 to ensure the stability of the placement of the liquid inlet filter screen 304.

[0074] The lower end of the inner wall of the limit ring 3021 is provided with an annular guiding inclined surface 30211 that slopes inward from bottom to top.

[0075] The setting of the guiding inclined surface 30211 facilitates the prior removal of the liquid inlet upper cover 302 when the liquid inlet filter screen 304 needs to be removed, and also facilitates the assembly of the liquid inlet upper cover 302 after the liquid inlet filter screen 304 is cleaned and installed.

[0076] As shown in the appendix Figure 15As shown, the bypass pipe further includes a liquid outlet device 4. The liquid outlet device 4 includes a liquid outlet housing 401 and a fluid locking mechanism 6. In this application, the structure of the fluid locking mechanism in the liquid outlet housing is the same as that in the liquid inlet housing, and the structure of the liquid outlet upper cover is the same as that of the liquid inlet upper cover, which will not be described in detail here. The liquid outlet housing 401 is provided with an upper opening, a liquid inlet three, and a liquid outlet three. The upper opening is covered with a liquid outlet upper cover 402. In this embodiment, the liquid outlet upper cover 402 is fixed to the liquid outlet housing 401 by bolts. An O-ring seal 5 is sleeved at the upper opening. In this embodiment, the liquid inlet three is located on the side wall of the liquid outlet housing, and the liquid outlet three is located at the bottom of the liquid outlet housing 401. The liquid inlet three of the liquid outlet housing 401 is connected to a liquid inlet pipe two 4031. An O-ring seal 5 is sleeved at the connection between the liquid inlet pipe two 4031 and the liquid inlet three. The liquid inlet pipe two 4031 is communicated with the liquid outlet one of the impeller housing. The fluid locking mechanism includes a flow blocking sleeve 601, a connecting shaft 603, a connecting sleeve 6021, and a flow blocking plug 6022. The flow blocking sleeve 601 extends into the liquid outlet housing and is connected to a liquid outlet pipe two 4032 at the lower end. The liquid outlet pipe two 4032 is inserted into the liquid outlet three of the liquid outlet housing. A diversion groove 6014 is formed on the flow blocking sleeve 601;

[0077] The connecting shaft 603, the connecting sleeve 6021, and the flow blocking plug 6022 are arranged in the flow blocking sleeve 601. The connecting sleeve 6021 is provided with internal threads, and the connecting shaft 603 is provided with external threads. The connecting sleeve and the connecting shaft are threadedly connected. The lower end of the connecting sleeve 6021 is connected to the flow blocking plug 6022. The connecting sleeve 6021 is in vertical sliding fit with the flow blocking sleeve 601. The rotation of the connecting shaft 603 drives the connecting sleeve 6021 and the flow blocking plug 6022 to move vertically. The flow blocking plug 6022 is inserted into the liquid outlet pipe two 4032; When it is necessary to clean the liquid inlet filter screen 304, first block the liquid inlet two through the fluid locking mechanism in the liquid inlet housing, and block the liquid outlet three through the fluid locking mechanism in the liquid outlet housing to effectively prevent fluid leakage.

[0078] A liquid outlet filter screen 404 is further arranged in the liquid outlet housing. The liquid outlet filter screen 404 adopts a cylindrical mesh structure and is sleeved outside the flow blocking sleeve 601.

[0079] In this embodiment, the liquid inlet filtering device, the impeller type fluid measuring device, and the liquid outlet device are fixed in the housing 1. The upper end of the housing is provided with an opening, and the opening is covered with a housing upper cover. A upper left opening is formed on the left side of the housing upper cover, and a upper right opening is formed on the right side. A lower left opening is formed on the left side of the bottom of the housing, and a lower right opening is formed on the right side. The shaft head of the fluid locking mechanism in the liquid inlet housing is located at the position of the upper left opening, the shaft head of the fluid locking mechanism in the liquid outlet housing is located at the position of the upper right opening, the liquid inlet pipe one 3031 is located at the position of the lower left opening, the liquid outlet pipe two 4032 is located at the position of the lower right opening, and the magnetic inductor 206 is fixed in the housing 1, and the position is close to the position of the magnet on the impeller.

[0080] As shown in the attached Figure 16 figure, a fluid pressure difference detection device includes a main pipeline 7 and a bypass pipeline. A bypass liquid inlet 701 is provided on the front side of the main pipeline 7, and a bypass liquid outlet 702 is provided on the rear side. The first liquid inlet pipe 3031 of the liquid inlet filtering device is communicated with the bypass liquid inlet 701, and the second liquid outlet pipe 4032 of the liquid outlet device is communicated with the bypass liquid outlet 702. In this embodiment, the first liquid inlet pipe 3031 is threadedly connected to the bypass liquid inlet 701, and the second liquid outlet pipe 4032 is threadedly connected to the bypass liquid outlet 702, which is convenient for installation, disassembly and maintenance.

[0081] In this embodiment, a relationship table or relationship formula between the impeller rotation speed and the pressure difference is stored in the controller. When the impeller rotates to drive the magnet to rotate, the magnetic sensor 206 will sense the change in the magnetic field of the magnet and convert these changes into electrical signals and feedback them to the controller. The controller calculates the rotation speed of the impeller 203, and then obtains the pressure difference of the main pipeline according to the relationship table or relationship formula between the impeller rotation speed and the pressure difference.

[0082] In actual application scenarios, a fluid pressure difference detection method is as follows. When the fluid in the main pipeline 7 flows, part of the fluid flows from the front side of the main pipeline 7 to the rear side of the main pipeline 7, and another part of the fluid enters the bypass pipeline from the front side of the main pipeline 7 through the bypass liquid inlet 701 and flows back to the rear side of the main pipeline 7 through the bypass liquid outlet 702;

[0083] The fluid entering the bypass pipeline drives the impeller 203 to rotate. The impeller 203 drives the magnet to rotate. The magnetic sensor 206 senses the change in the magnetic field of the magnet, and the rotation speed r of the impeller 203 can be measured;

[0084] According to the relationship table and / or relationship formula between the impeller rotation speed and the pressure difference, the fluid pressure difference value of the main pipeline 7 is obtained.

[0085] In this embodiment, a flow regulating valve (at position E in the attached Figure 16 figure) is installed on the main pipeline 7. The bypass liquid inlet 701 is located in front of the flow regulating valve, and the bypass liquid outlet 702 is located behind the flow regulating valve to measure the pressure difference before and after the flow regulating valve; it can also be a filter (at position E in the attached Figure 16 figure) is provided in the main pipeline 7 to measure the pressure difference before and after the filter; this pressure difference measurement method can be applied to different application scenarios.

[0086] The relationship table between the impeller rotation speed and the pressure difference is obtained through experiments. One of the experimental devices used is that an experimental main pipeline is set on the experimental bench. An experimental impeller is provided in the experimental main pipeline. The experimental impeller is rotationally matched with the experimental main pipeline. A first pressure sensor is installed on the front side of the experimental impeller on the experimental main pipeline, and a second pressure sensor is installed on the rear side of the experimental impeller;

[0087] When the fluid in the main experimental pipeline flows, the fluid drives the experimental impeller in the main experimental pipeline to rotate. The rotation of the experimental impeller drives the magnet on the experimental impeller to rotate. The magnetic inductor senses the change in the magnetic field of the magnet, and the controller can measure the rotational speed R of the experimental impeller in the main experimental pipeline.

[0088] The first pressure sensor detects the pressure P1 on the front side of the impeller in the main experimental pipeline and uploads it to the controller. The second pressure sensor detects the pressure P2 on the rear side of the impeller in the main experimental pipeline and uploads it to the controller, and the pressure difference △P between the front and rear sides of the impeller on the main experimental pipeline can be obtained.

[0089] Record the specific values of △P and R during this experimental process.

[0090] Change the fluid power and continue to conduct multiple experiments. Record the specific values of △P and R under different fluid powers, and the relationship table between the impeller rotational speed and the pressure difference can be obtained.

[0091] Based on the experimental data in the relationship table between the impeller rotational speed and the pressure difference, the relationship formula between the impeller rotational speed and the pressure difference can be obtained. Write this relationship formula into the controller. During actual use, the rotational speed r of the impeller in the bypass pipeline can be measured, and the controller can quickly obtain the pressure difference value △p of the fluid in the main pipeline 7 according to the relationship formula between the impeller rotational speed and the pressure difference.

[0092] Another experimental device adopted has the same structure as the actual fluid pressure difference detection device, which will not be elaborated in detail here. Set up the main experimental pipeline and the experimental bypass pipeline, install the first pressure sensor on the front side and the second pressure sensor on the rear side of the main experimental pipeline.

[0093] When the fluid in the main experimental pipeline flows, part of the fluid flows from the front side of the main experimental pipeline to the rear side of the main experimental pipeline, and another part of the fluid enters the experimental bypass pipeline from the front side of the main experimental pipeline through the bypass liquid inlet and flows back to the rear side of the main experimental pipeline through the bypass liquid outlet.

[0094] The fluid entering the experimental bypass pipeline drives the experimental impeller in the experimental bypass pipeline to rotate. The experimental impeller drives the magnet to rotate. The magnetic inductor senses the change in the magnetic field of the magnet, and the controller can measure the rotational speed R of the experimental impeller.

[0095] The first pressure sensor detects the pressure P1 on the front side of the main experimental pipeline and uploads it to the controller. The second pressure sensor detects the pressure P2 on the rear side of the main experimental pipeline and uploads it to the controller, and the pressure difference △P between the front and rear sides on the main experimental pipeline can be obtained.

[0096] Record the specific values of △P and R during this experimental process.

[0097] Change the hydrodynamic force and continue with multiple experiments. Record the specific values of △P and R at different hydrodynamic forces of the fluid to obtain a relationship table between the impeller speed and the pressure difference. According to the experimental data in the relationship table between the impeller speed and the pressure difference, the relationship formula between the impeller speed and the pressure difference can be obtained. Write this relationship formula into the controller. During actual use, the impeller speed in the bypass pipeline can be measured. Based on the relationship formula between the impeller speed and the pressure difference, the controller can quickly obtain the pressure difference value of the fluid in the main pipeline 7.

[0098] In this embodiment, the adjustment of the hydrodynamic force on the test bench can be achieved by installing a circulation pump on the front side of the main pipeline and adjusting the speed of the circulation pump, the opening degree of the pump outlet valve, etc.

[0099] When the present utility model is in use:

[0100] 1. When the fluid in the main pipeline 7 is flowing, set the opening degree of the flow regulating valve and open it. A part of the fluid flows from the front side to the rear side of the main pipeline 7 through the valve, and another part of the fluid enters the flow blocking sleeve 601 in the liquid inlet housing through the bypass liquid inlet 701 and the first liquid inlet pipe 3031. After passing through the diversion groove 6014 of the flow blocking sleeve 601, it is filtered by the liquid inlet filter screen 304, and then sequentially passes through the first liquid outlet pipe 3032 and the liquid inlet 2011 of the impeller housing 201 to enter the impeller housing 201. The fluid flow drives the impeller 203 to rotate, and the magnet rotates in a circular motion following the impeller 203. When the impeller 203 rotates, the magnetic sensor 206 will sense the magnetic field change of the magnet, convert these changes into electrical signals and upload them to the controller, and the rotation speed of the impeller 203 can be measured. The fluid then flows through the liquid outlet 2012 of the impeller housing, the second liquid inlet pipe 4031, the liquid outlet filter screen 404, and the diversion groove 6014 of the flow blocking sleeve 601 in the liquid outlet housing and flows out from the second liquid outlet pipe 4032, and then flows into the rear end of the main pipeline 7 through the bypass liquid outlet 702;

[0101] 2. According to the relationship formula between the impeller speed and the pressure difference or the relationship table between the impeller speed and the pressure difference, based on the measured impeller speed r, the pressure difference value △p between the front and rear sides of the valve in the main pipeline can be obtained;

[0102] 3. When it is necessary to clean the liquid inlet filter screen 304 and the liquid outlet filter screen 404, insert the hex wrench into the shaft head slot at the position of the liquid inlet housing and rotate it forward, driving the connecting shaft 603 to rotate forward. The connecting sleeve 6021 and the flow blocking plug 6022 move downward along the guiding groove 6011 of the flow blocking sleeve 601, and the flow blocking plug 6022 is inserted into the first liquid inlet pipe 3031. Insert the hex wrench into the shaft head slot at the position of the liquid outlet housing 401 and rotate it forward, driving the connecting shaft 603 to rotate forward. The connecting sleeve 6021 and the flow blocking plug 6022 move downward along the guiding groove 6011 of the flow blocking sleeve 601, and the flow blocking plug 6022 is inserted into the second liquid outlet pipe 4032;

[0103] 4. Open the upper cover of the housing, then open the liquid inlet upper cover 302, take out the liquid inlet filter screen 304 in the liquid inlet housing 301 for cleaning. After cleaning, insert the liquid inlet filter screen 304 into the liquid inlet housing 301, and use the filter screen limit block 6015 for guiding and limiting. Cover the liquid inlet upper cover 302, open the liquid outlet upper cover 402, take out the liquid outlet filter screen 404 in the liquid outlet housing 401 for cleaning. After cleaning, insert the liquid outlet filter screen 404 into the liquid outlet housing 401, and use the filter screen limit block 6015 for guiding and limiting. Cover the liquid outlet upper cover 402 and the upper cover of the housing.

[0104] 5. Insert the hexagon wrench into the shaft head slot at the position of the liquid inlet housing and rotate it reversely, driving the connecting shaft 603 to rotate reversely. The connecting sleeve 6021 and the flow blocking plug 6022 move upward along the guiding groove 6011 of the flow blocking sleeve 601, and the flow blocking plug 6022 moves out of the first liquid inlet pipe 3031. Insert the hexagon wrench into the shaft head slot at the position of the liquid outlet housing 401 and rotate it reversely, driving the connecting shaft 603 to rotate reversely. The connecting sleeve 6021 and the flow blocking plug 6022 move upward along the guiding groove 6011 of the flow blocking sleeve 601, and the flow blocking plug 6022 moves out of the second liquid outlet pipe 4032. At this time, when the fluid in the main pipeline flows, a part of it flows through the bypass pipeline.

Claims

1. A fluid pressure difference detection device, characterized in that: It comprises a main pipeline and a bypass pipeline, wherein the front side of the main pipeline is provided with a bypass liquid inlet, and the rear side is provided with a bypass liquid outlet, the bypass pipeline adopts an impeller-type fluid measuring device, and the impeller-type fluid measuring device comprises an impeller housing, an impeller, a magnet and a magnetic sensor, an impeller is provided in the impeller housing and is rotatably matched with the impeller housing, a magnet is installed on the impeller, and the magnet cooperates with the magnetic sensor, and a liquid inlet and a liquid outlet are provided on the impeller housing; The first liquid inlet is connected to the bypass liquid inlet, and the first liquid outlet is connected to the bypass liquid outlet.

2. A fluid pressure difference detection device according to claim 1, characterized in that: The bypass pipeline also includes a liquid inlet filter device, which is arranged between the bypass liquid inlet and the liquid inlet 1 of the impeller housing.

3. A fluid pressure difference detection device according to claim 2, characterized in that: The liquid inlet filter device includes a liquid inlet shell and a filter element. The liquid inlet shell is provided with a second liquid inlet and a second liquid outlet. The second liquid inlet is connected to the bypass liquid inlet, and the second liquid outlet is connected to the first liquid inlet of the impeller shell. The filter element is arranged in the liquid inlet shell.

4. A fluid pressure difference detection device according to claim 3, characterized in that: The bypass pipeline also includes a liquid outlet device, and the liquid outlet device is arranged between the bypass liquid outlet and the first liquid outlet of the impeller housing; The liquid inlet filter device also includes a fluid locking mechanism, the liquid inlet housing is provided with an upper opening, the upper opening is covered with a liquid inlet upper cover, the fluid locking mechanism includes a flow blocking sleeve, a connecting shaft, a connecting sleeve and a flow blocking plug, the flow blocking sleeve extends into the liquid inlet housing, and the lower end is connected to the liquid inlet port of the liquid inlet housing, a guide groove is provided on the flow blocking sleeve, and the filter element adopts a cylindrical mesh structure and is sleeved outside the flow blocking sleeve; The connecting shaft, the connecting sleeve and the flow-blocking plug are arranged in the flow-blocking sleeve, the connecting sleeve is provided with an internal thread, the connecting shaft is provided with an external thread, the connecting sleeve is threadedly connected to the connecting shaft, one of the connecting sleeve and the connecting shaft is vertically slidably matched with the flow-blocking sleeve and the lower end is connected to the flow-blocking plug, the other of the connecting sleeve and the connecting shaft rotates to drive one of the connecting sleeve and the connecting shaft and the flow-blocking plug to move vertically, and the flow-blocking plug is inserted into the second liquid inlet of the liquid inlet housing; The liquid outlet device comprises a liquid outlet housing and a fluid locking mechanism, the liquid outlet housing is provided with an upper opening, a third liquid inlet and a third liquid outlet, the upper opening is covered with a liquid outlet upper cover, the third liquid inlet is communicated with the first liquid outlet of the impeller housing, the third liquid outlet is communicated with the bypass liquid outlet, the fluid locking mechanism comprises a baffle sleeve, a connecting shaft, a connecting sleeve and a baffle plug, the baffle sleeve extends into the liquid outlet housing, the lower end of the baffle sleeve is communicated with the third liquid outlet of the liquid outlet housing, and a guide groove is provided on the baffle sleeve; The connecting shaft, connecting sleeve and flow-blocking plug are arranged in the flow-blocking sleeve, the connecting sleeve is provided with an internal thread, the connecting shaft is provided with an external thread, the connecting sleeve is threadedly connected to the connecting shaft, the lower end of one of the connecting sleeve and the connecting shaft is connected to the flow-blocking plug and vertically slides with the flow-blocking sleeve, the other one of the connecting sleeve and the connecting shaft rotates to drive the connecting sleeve, one of the connecting sleeve and the connecting shaft and the flow-blocking plug to move vertically, and the flow-blocking plug is inserted into the third liquid outlet of the liquid outlet shell.

5. A fluid pressure difference detection device according to claim 4, characterized in that: A filter is also arranged in the liquid outlet housing, and the filter adopts a cylindrical mesh structure and is sleeved outside the flow-blocking sleeve.

6. A fluid pressure difference detection device according to claim 4 or 5, characterized in that: The lower end of the flow blocking sleeve in the liquid inlet housing is connected to the liquid inlet pipe 1, and the liquid inlet pipe 1 is inserted into the liquid inlet port 2; The lower end of the flow blocking sleeve in the liquid outlet housing is connected to the second liquid outlet pipe, and the second liquid outlet pipe is inserted into the third liquid outlet; The first liquid inlet pipe is connected to the bypass liquid inlet, and the second liquid outlet pipe is connected to the bypass liquid outlet.

7. A fluid differential pressure detection device according to claim 6, characterized in that: The first liquid inlet pipe is threadedly connected to the bypass liquid inlet, and the second liquid outlet pipe is threadedly connected to the bypass liquid outlet.

8. A fluid differential pressure detection device according to claim 1 or 2 or 3 or 4 or 5 or 7, characterized in that: An impeller shaft is arranged in the impeller housing, the impeller is sleeved on the impeller shaft, the upper surface of the impeller hub extends upward along the impeller axis to form a protrusion, the protrusion is located higher than the impeller blades, and the magnet is mounted on the protrusion.

9. A fluid pressure difference detection device according to claim 8, characterized in that: A rear guide slope with a smooth transition connection is provided between the inner wall of the impeller housing near the first liquid outlet and the first liquid outlet, and the rotation direction of the impeller matches the inclination direction of the rear guide slope.

10. A fluid pressure difference detection device according to claim 1 or 2 or 3 or 4 or 5 or 7 or 9, characterized in that: The bypass pipeline is arranged in the shell, and the magnetic sensor is fixed in the shell and is located close to the position of the magnet on the impeller.

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