Uniform velocity pipe flow sensor, flow meter and flow control device

Abstract

The utility model discloses a constant velocity tube flow sensor which comprises at least one pair of pressure tapping tubes and a driving mechanism, a plugging sheet is arranged at an opening of each pressure tapping tube, the opening allows to-be-measured fluid to enter the opening, and the driving mechanism drives the pressure tapping tubes or the plugging sheets to move relatively. And the plugging sheet leaves the opening when measurement is carried out and plugs the opening when measurement is not carried out. The utility model further discloses a flow meter and a flow control device which comprise the constant-speed pipe flow sensor. According to the constant-speed pipe flow sensor, accumulation of adhesive substances in the fluid to be measured at the opening can be remarkably reduced, and therefore the cleaning and overhauling period is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of gas detection, especially relates to a uniform speed pipe flow sensor, a flowmeter with the uniform speed pipe flow sensor, a flow control device with the flowmeter and a method for controlling flow using the flow control device. BACKGROUND

[0002] The uniform speed pipe flowmeter is a differential pressure flowmeter, also known as an Anoba flowmeter or a Torabon pipe flowmeter, and its working principle is as follows: two side-hole pressure taps are inserted into a closed pipeline filled with the measured medium perpendicular to the radial center axis of the pipeline, the high-pressure pressure tap opens towards the fluid flow direction, and the low-pressure pressure tap opens away from the fluid flow direction, and the two pressure taps can be separated or combined together; when the fluid passes through the two pressure taps, the high and low pressure taps obtain a pressure respectively, the pressure difference ΔP of the two pressures is calculated, and the flow of the measured medium can be obtained by using the Bernoulli equation.

[0003] When the uniform speed pipe flowmeter is used to measure the flow of fluid containing pollutants that may block the opening of the pressure tap, the prior art usually adopts anti-blowing design (for example: CN216206664U, CN219084147U, CN221044432U), anti-sticking coating design (for example: CN2881558Y, etc.) and the like. However, when these uniform speed pipe flowmeters are used to measure the exhaust gas flow of oil fume in a household kitchen or a commercial restaurant, the oil particles in the oil fume will still adhere to and gradually accumulate at the position of the pressure tap opening and other positions, causing the pressure tap to be blocked and affecting the measurement, and such oil blockage is often difficult to remove by back flushing.

[0004] Therefore, there is still a need for improved uniform speed pipe flowmeters to solve the above problems. SUMMARY

[0005] To solve the above technical problems, the inventors have created the following uniform speed pipe flow sensor, flowmeter, and flow control device and method through creative labor. Specifically, the utility model provides the following technical solutions.

[0006] In one aspect, the utility model provides a kind of uniform velocity pipe flow sensor, including at least one pair of pressure tapping pipe, one is high pressure pressure tapping pipe in upstream of fluid flow direction, the other is low pressure pressure tapping pipe in downstream of fluid flow direction, the high pressure pressure tapping pipe and low pressure pressure tapping pipe each have opening, and when the uniform velocity pipe flow sensor is in the first state of carrying out flow measurement, the opening of high pressure pressure tapping pipe faces fluid flow direction while the opening of low pressure pressure tapping pipe is away from fluid flow direction, it is characterized in that, blocking sheet is provided at each opening, and the uniform velocity pipe flow sensor further includes driving mechanism to drive the high pressure pressure tapping pipe and low pressure pressure tapping pipe or the blocking sheet movement, so that when the uniform velocity pipe flow sensor is in the first state, the blocking sheet leaves the opening to allow fluid to pass through opening into each pressure tapping pipe, and when the uniform velocity pipe flow sensor is in the second state of not carrying out measurement, the blocking sheet blocks the opening to prohibit fluid to pass through opening into each pressure tapping pipe.

[0007] Further, the driving mechanism is by rotating or pulling the pressure tapping pipe so that the blocking sheet is away from or blocks the opening along the circumferential direction, longitudinal direction or radial direction of the pressure tapping pipe, or by rotating or pulling the blocking sheet so that the blocking sheet is away from or blocks the opening along the circumferential direction, longitudinal direction or radial direction of the pressure tapping pipe.

[0008] Further, the high pressure pressure tapping pipe and low pressure pressure tapping pipe in the at least one pair of pressure tapping pipe are separated from each other, or the high pressure pressure tapping pipe and low pressure pressure tapping pipe in the at least one pair of pressure tapping pipe are combined with each other.

[0009] Further, the blocking sheet includes first blocking sheet wrapped on high pressure pressure tapping pipe in half-enclosing form and second blocking sheet wrapped on low pressure pressure tapping pipe in half-enclosing form, first blocking sheet and second blocking sheet are connected with each other by connecting piece and clamped between high pressure pressure tapping pipe and low pressure pressure tapping pipe to allow high pressure pressure tapping pipe and low pressure pressure tapping pipe to rotate around respective axial direction, so that the opening of high pressure pressure tapping pipe faces fluid flow direction while the opening of low pressure pressure tapping pipe is away from fluid flow direction in the first state, and the opening of high pressure pressure tapping pipe is away from fluid flow direction and blocked by first blocking sheet while the opening of low pressure pressure tapping pipe faces fluid flow direction and blocked by second blocking sheet in the second state.

[0010] Further, the high pressure tapping pipe and the low pressure tapping pipe are parallel to each other, the first projection of the first blocking sheet, the second blocking sheet and the connecting member on the fluid cross section exceeds the maximum dimension of the part of the second projection of the high pressure tapping pipe and the low pressure tapping pipe on the fluid cross section by not more than 1% to 10% of the minimum dimension of the second projection, and the area of the first projection is 1% to 120% of the area of the second projection. Preferably, the first projection is within the range of the second projection, and the area of the first projection is 1% to 50%, for example 1%, 2%, 5%, 10%, 20%, 30%, 40%, 50% and the like, of the area of the second projection.

[0011] Further, the part of the connecting member between the high pressure tapping pipe and the low pressure tapping pipe is at least partially hollow, and the area of the third projection of the hollow part on the fluid longitudinal section is 50% to 99%, for example 50%, 55%, 60%, 70%, 80%, 90%, 95%, 99% and the like, of the area of the fourth projection of the area defined between the high pressure tapping pipe and the low pressure tapping pipe on the fluid longitudinal section.

[0012] Further, the connecting member is a plurality of connecting rods, the two ends of the connecting rod are connected to the first blocking sheet and the second blocking sheet respectively, the longitudinal direction of the connecting rod is parallel to the fluid flow direction, and the maximum dimension of the cross section of the connecting rod is 5% to 50%, for example 5%, 10%, 20%, 30%, 40%, 50% and the like, of the diameter of the high pressure tapping pipe or the low pressure tapping pipe.

[0013] In another aspect, the utility model provides a uniform speed pipe flowmeter, it is characterized by, including the flow guide pipe of guiding fluid from upstream to downstream, install in the flow guide pipe according to the uniform speed pipe flow sensor of any one above, with the high pressure tapping pipe and low pressure tapping pipe fluid communication to measure the pressure difference gauge of both pressure difference, and optional with the pressure difference gauge communication connection to calculate the corresponding flow according to the pressure difference calculation device.

[0014] Further, at least one end of the high pressure tapping pipe and the low pressure tapping pipe in the uniform speed pipe flow sensor or at least one end of the first blocking sheet and the second blocking sheet respectively protrudes the pipe wall of the flow guide pipe, and the driving mechanism is power connected with the end to drive the high pressure tapping pipe and the low pressure tapping pipe to rotate around its axis direction or along its longitudinal direction, or drive the first blocking sheet and the second blocking sheet to rotate around its axis direction or along its longitudinal direction.

[0015] In still another aspect, the utility model provides a flow control device, its characterized in be including the uniform velocity tube flowmeter of each any one, with the flow guide pipe of the uniform velocity tube flowmeter connects for controlling the flow control valve of fluid flow in flow guide pipe, and optional with the flow control valve, the drive mechanism and the pressure difference gauge or the communication connection of calculation device control mechanism.

[0016] Compared with the prior art, the utility model has at least the following beneficial technical effects:

[0017] The uniform velocity tube flow sensor of the utility model can timely block each opening of the high-pressure pressure-taking pipe and the low-pressure pressure-taking pipe through the first blocking piece and the second blocking piece, and only opens the opening when measuring the pressure difference of the two, which significantly reduces the accumulation of adherable substances in the opening in the measured fluid, effectively prolongs the cleaning and maintenance period, greatly reduces the maintenance workload, which is particularly advantageous in the discharge of oil smoke-containing waste gas in various civil buildings, especially high-rise residential buildings. On the contrary, in the anti-blowing cleaning and anti-sticking coating and other anti-clogging schemes of the prior art, the openings of the pressure-taking pipes are inevitably exposed to the measured fluid for a long time, and it is difficult to solve the clogging problem caused by the long-term accumulation of adherable substances such as oil smoke.

[0018] In the description of the utility model, "substantially" does not exclude "completely". For example, a component "substantially does not contain" Y, which can also be completely free of Y. If necessary, "substantially" can be deleted from the definition of the utility model. "Contains" includes the mentioned factors and allows to include additional, uncertain factors. "About", "left and right" means + / - 5%, + / - 4%, + / - 3%, + / - 2%, + / - 1%, + / - 0.5% of the standard value when indicating the concentration of each component. "And / or" means that the multiple terms connected by it can be used individually, and can be combined with each other at will.

[0019] In the utility model, a certain range is generally used to describe examples, just for the purpose of concise and clear explanation, but not as a limitation of the utility model. The described range includes sub-ranges and all individual values within the range. For example, the range of 1-6 includes sub-ranges such as 1-3, 1-4, 1-5, 2-4, 2-6, 3-6, and also includes individual values within the range, such as 1, 2, 3, 4, 5 and 6.

[0020] In the description of the utility model, need understanding is, the term "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and so on the orientation or positional relation indicated is based on the orientation or positional relation shown in the drawing, just is for the convenience of describing the utility model, and it is not indicated or implied that the device or element must have a particular orientation, with a particular orientation configuration and operation, therefore can not be understood as the limitation of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the three-dimensional structure schematic diagram of the uniform speed pipe flow sensor in the first state according to the utility model,

[0022] Figure 2 It is Figure 1 The three-dimensional structure schematic diagram of the uniform speed pipe flow sensor in the second state shown in the figure,

[0023] Figure 3 It is Figure 1 The three-dimensional structure schematic diagram of the combination of the first blocking sheet and the second blocking sheet of the uniform speed pipe flow sensor shown in the figure,

[0024] Figure 4 It is the three-dimensional structure schematic diagram of the uniform speed pipe flow meter according to the utility model, wherein including two sets Figure 1 The uniform speed pipe flow sensor shown in the figure,

[0025] Figure 5 It is the three-dimensional structure schematic diagram of another uniform speed pipe flow sensor according to the utility model,

[0026] Figure 6 It is Figure 5 The three-dimensional structure schematic diagram of the combination of the high pressure pressure taking pipe and the low pressure pressure taking pipe of the uniform speed pipe flow sensor shown in the figure,

[0027] Figure 7 It is Figure 5 The three-dimensional structure schematic diagram of the combination of the first blocking sheet and the second blocking sheet of the uniform speed pipe flow sensor shown in the figure,

[0028] Figure 8 It is the three-dimensional structure diagram of two uniform speed pipe flow meters according to the utility model, wherein including two sets Figure 5 The uniform speed pipe flow sensor shown in the figure,

[0029] Figure 9 It is Figure 8 The longitudinal section view of the uniform speed pipe flow meter shown in the figure,

[0030] Figure 10 It is Figure 9partial enlarged view of the uniform velocity tube flow meter in a first state of measuring flow rate;

[0031] Figure 11 is Figure 9 partial enlarged view of the uniform velocity tube flow meter in a second state of not measuring flow rate;

[0032] Figure 12 is a longitudinal sectional view of a flow control device according to the present application, which includes a uniform velocity tube flow meter as shown in Figure 4

[0033] in the figure:

[0034] 11-high pressure tapping pipe, 12-low pressure tapping pipe, 13-first opening, 14-first blocking piece, 15-second blocking piece, 16-connection piece, 17-driving mechanism, 18-second opening, 19-longitudinal partition, 2-pressure difference meter, 3-flow guide pipe, 41-first convex part, 42-second convex part, 43-limiting table, 51-valve body, 52-valve piece, 53-valve shaft, 54-control mechanism. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] Embodiment 1

[0037] Reference Figures 1-3 According to the uniform velocity tube flow sensor of the present application, one of the pair of parallel and separated pressure tapping pipes is a high pressure tapping pipe 11 upstream of the fluid flow direction, and the other is a low pressure tapping pipe 12 downstream of the fluid flow direction. The high pressure tapping pipe 11 and the low pressure tapping pipe 12 each have a first opening 13, and when the uniform velocity tube flow sensor is in a first state of measuring flow rate, the first opening 13 of the high pressure tapping pipe 11 faces the fluid flow direction and the first opening 13 of the low pressure tapping pipe 12 faces away from the fluid flow direction.

[0038] ​A first blocking sheet 14 is arranged on the high-pressure tapping pipe 11 in a semi-enclosing manner and is attached to the outer wall of the high-pressure tapping pipe 11, and a second blocking sheet 15 is arranged on the low-pressure tapping pipe 12 in a semi-enclosing manner and is attached to the outer wall of the low-pressure tapping pipe 12. The first blocking sheet 14 and the second blocking sheet 15 are connected to each other by a connecting member 16 and allow the high-pressure tapping pipe 11 and the low-pressure tapping pipe 12 to rotate around the respective axes, so that, in a first state, the first opening 13 of the high-pressure tapping pipe 11 faces the fluid flow direction, the first opening 13 of the low-pressure tapping pipe 12 faces away from the fluid flow direction, and the first blocking sheet 14 and the second blocking sheet 15 are away from the first opening 13 to allow the fluid to enter the first opening 13, thereby measuring the flow rate; and in a second state in which the flow rate of the fluid is not measured, the first opening 13 of the high-pressure tapping pipe 11 faces away from the fluid flow direction and is blocked by the first blocking sheet 14 along the circumference of the high-pressure tapping pipe 11, and the first opening 13 of the low-pressure tapping pipe 12 faces the fluid flow direction and is blocked by the second blocking sheet 15 along the circumference of the low-pressure tapping pipe 11 to prevent the fluid from entering the first opening 13, thereby avoiding long-term exposure of the first opening 13 to the fluid, significantly reducing the accumulation of viscous substances in the fluid at the first opening 13, and greatly extending the maintenance period.

[0039] In some cases, the connecting member 16 is a plurality of connecting rods, the two ends of the connecting rods are connected to the first blocking sheet 14 and the second blocking sheet 15 respectively, the longitudinal direction of the connecting rods is parallel to the fluid flow direction, and the maximum dimension of the cross section of the connecting rods is not greater than 50% of the diameter of the high-pressure tapping pipe 11 or the low-pressure tapping pipe 12, for example, not greater than 5%, 10%, 20%, 30%, 40%, 50%, etc.

[0040] The inventor of the utility model has unexpectedly found that when the first projection of the first blocking sheet 14, the second blocking sheet 15 and the connecting member 16 on the fluid cross section exceeds the maximum dimension of the part of the second projection of the high-pressure tapping pipe 11 and the low-pressure tapping pipe 12 on the fluid cross section by not more than 10% of the minimum dimension of the second projection, and the area ratio of the first projection to the second projection is less than or equal to 1.1:1, and at the same time, the part of the connecting member 16 between the high-pressure tapping pipe 11 and the low-pressure tapping pipe 12 is at least partially hollow, and the area of the third projection of the hollow part on the fluid longitudinal cross section is not greater than 60% of the area of the fourth projection of the area defined between the high-pressure tapping pipe 11 and the low-pressure tapping pipe 12 on the fluid longitudinal cross section, the result of measuring the flow rate using the uniform-speed pipe flow sensor shows that the fluctuation range of the measured flow rate is not greater than 3% of the average flow rate.

[0041] The high pressure tapping pipe 11 and the low pressure tapping pipe 12 are each provided with a driving mechanism 17, which can drive the high pressure tapping pipe 11 and the low pressure tapping pipe 12 to rotate around their axes by manual, electric, pneumatic or hydraulic drive, so as to switch the uniform velocity tube flow sensor between the first state and the second state.

[0042] In some cases, the driving mechanism 17 is provided with marks, such as color, shape and the like, to help determine the position of the high pressure tapping pipe 11 and the low pressure tapping pipe 12.

[0043] Embodiment 2

[0044] Reference Figure 4 According to the utility model, a uniform velocity tube flow meter comprises a guide pipe 3 for guiding fluid to flow from upstream to downstream, two uniform velocity tube flow sensors according to embodiment 1 which are installed in the guide pipe 3 and perpendicular to each other, and a differential pressure gauge 2 which is in fluid communication with the high pressure tapping pipe 11 and the low pressure tapping pipe 12 of the uniform velocity tube flow sensors to measure the pressure difference between the two.

[0045] In the determination of flow, the fluid to be measured is introduced from upstream into the guide pipe 3, and the high pressure tapping pipe 11 and the low pressure tapping pipe 12 are rotated by the driving mechanism 17, so that the first opening 13 is away from the first blocking piece 14 and the second blocking piece 15 and exposed to the fluid, so that the uniform velocity tube flow sensor is in the first state, the fluid enters the high pressure tapping pipe 11 and the low pressure tapping pipe 12 through the first opening 13, the differential pressure gauge 2 measures the pressure difference between the high pressure tapping pipe 11 and the low pressure tapping pipe 12, then the operator reads the pressure difference data measured by the differential pressure gauge 2, and according to the parameters and formulas, work tables or work curves calibrated in advance, the corresponding flow can be conveniently determined manually or automatically. In some cases, the differential pressure gauge is in communication connection with a calculation device (not shown) to automatically calculate the corresponding flow according to the pressure difference, and the differential pressure gauge or the calculation device can further comprise a communication device to transmit the measured pressure difference data or the calculated flow data to a designated device.

[0046] When the flow determination is completed, the high pressure tapping pipe 11 and the low pressure tapping pipe 12 are rotated by the driving mechanism 17, so that the first opening 13 is blocked by the first blocking piece 14 and the second blocking piece 15 and isolated from the fluid, so that the uniform velocity tube flow sensor is in the second state, until the next flow determination is performed. Since the first opening 13 is exposed to the fluid for a short time, the viscous substances in the fluid are rarely adhered and accumulated at the first opening 13, so as to ensure that the flow meter can be operated stably for a long time.

[0047] Embodiment 3

[0048] Reference Figures 5-7Another uniform velocity tube flow sensor according to this utility model includes a pressure tapping tube assembly consisting of a high-pressure tapping tube 11 and a low-pressure tapping tube 12 joined together, and a sealing plate assembly consisting of a first sealing plate 14, a second sealing plate 15, and a connector 16 sleeved on the pressure tapping tube assembly. The high-pressure tapping tube 11 and the low-pressure tapping tube 12 are separated by a longitudinal partition 19 in the pressure tapping tube assembly. A row of first openings 13 is provided longitudinally on the sidewall of the high-pressure tapping tube 11 facing the fluid flow direction. Two rows of first openings 13 are provided longitudinally on the sidewall of the low-pressure tapping tube 12 facing away from the fluid flow direction. When the uniform velocity tube flow sensor is in the first state of measuring flow rate, the sealing plate assembly is located at a first position on the pressure tapping tube assembly, and the first sealing plate 14 and the second sealing plate 15 each have a second opening 18 at a position corresponding to the first openings 13 on the high-pressure tapping tube 11 and the low-pressure tapping tube 12, thereby allowing the first openings 13 to be exposed to the fluid. When the constant velocity tube flow sensor is in the second state where no flow is measured, the sealing plate assembly is located in the second position on the pressure tapping tube assembly. The positions on the first sealing plate 14 and the second sealing plate 15 corresponding to the first opening 13 on the high pressure tapping tube 11 and the low pressure tapping tube 12 are blocked by the first sealing plate 14 or the second sealing plate 15, thereby isolating the first opening 13 from the fluid.

[0049] A drive mechanism 17 is provided at one end of the occlusion plate assembly. By reciprocating the drive mechanism 17, the occlusion plate assembly can be moved back and forth between a first position and a second position along the longitudinal direction of the pressure tapping tube assembly, thereby realizing the switching between the first state and the second state.

[0050] Example 4

[0051] refer to Figures 8-11 Another uniform velocity tube flowmeter according to the present invention includes a guide tube 3 that guides fluid from upstream to downstream and two uniform velocity tube flow sensors arranged perpendicularly to each other according to embodiment 3, and a differential pressure gauge 2 that is in fluid communication with the high pressure tapping tube 11 and the low pressure tapping tube 12 in the uniform velocity tube flow sensors to measure the pressure difference between them.

[0052] refer to Figure 10In the flow rate measurement, the fluid to be measured is introduced from the upstream into the flow guide pipe 3, and the drive mechanism 17 is driven to push down the shutter assembly including the first shutter 14 and the second shutter 15 until the first protrusion 41 on the drive mechanism 17 abuts against the limiting platform 43 on the pressure tapping pipe assembly including the high pressure tapping pipe 11 and the low pressure tapping pipe 12, so that the shutter assembly is located at the first position of the pressure tapping pipe assembly, and each first opening 13 is in communication with the corresponding second opening 18, so that the first opening 13 is exposed to the fluid, thereby the uniform velocity tube flow sensor is in the first state of measuring the flow rate, the fluid enters the high pressure tapping pipe 11 and the low pressure tapping pipe 12 through the first opening 13, the differential pressure meter 2 measures the differential pressure between the high pressure tapping pipe 11 and the low pressure tapping pipe 12, then the operator reads the differential pressure data measured by the differential pressure meter 2, and according to the parameters and formulas, work tables or work curves calibrated in advance, the corresponding flow rate can be determined conveniently by manual or automatic operation. In some cases, the differential pressure meter is communicatively connected to a calculation device (not shown) to automatically calculate the corresponding flow rate according to the differential pressure, and the differential pressure meter or the calculation device can further include a communication device to transmit the measured differential pressure data or the calculated flow rate data to a designated device.

[0053] Reference Figure 11 When the flow rate measurement is completed, the shutter assembly is pulled up by the drive mechanism 17 until the second protrusion 42 on the drive mechanism 17 abuts against the inner wall of the flow guide pipe 3, so that the shutter assembly is located at the second position of the pressure tapping pipe assembly, and each first opening 13 is misaligned with the corresponding second opening 18, so that the first opening 13 is blocked by the first shutter 14 and the second shutter 15 and isolated from the fluid, thereby the uniform velocity tube flow sensor is in the second state of not measuring the flow rate, until the next flow rate measurement is performed. Since the first opening 13 is exposed to the fluid for a short time, the viscous substances in the fluid are rarely adhered and accumulated at the first opening 13, thereby ensuring that the flow meter can operate stably for a long time.

[0054] Example 5

[0055] Reference Figure 12, according to the utility model discloses the flow control device includes the uniform speed pipe flowmeter according to embodiment 2, the valve body 51 for controlling the flow control valve of fluid flow in the flow guide pipe 3 of the uniform speed pipe flowmeter connection, the flow control valve still includes valve piece 52, valve shaft 53 and control mechanism 54.In some cases, operating personnel according to the flow data determined by the uniform speed pipe flowmeter, manually or automatically adjusts the flow control valve by control mechanism 54 so as to adjust fluid flow to predetermined value.In other cases, the control mechanism 54 is connected with the flow control valve, the drive mechanism 17 and the differential pressure gauge 2 or optional computing device communication, so as to control drive mechanism 17 and make the uniform speed pipe flowmeter be in first state, control differential pressure gauge 2 determines the differential pressure (and optionally control computing device according to the differential pressure calculates corresponding flow), then control valve shaft 53 rotates valve piece 52 to adjust fluid flow;Repeat the above steps until the measured fluid flow is consistent with the set or required value;Finally control drive mechanism 17 and make the uniform speed pipe flowmeter be in second state, block the opening 13 to avoid the viscous material in fluid adheres and accumulates in opening 13.

[0056] In some cases, the flow control method using the flow control device includes:

[0057] S100, the fluid to be controlled flow passes through the flow control device;

[0058] S200, by the drive mechanism, the flow sensor is in first state, and start differential pressure gauge 2 and measure the differential pressure between high pressure tapping pipe 11 and low pressure tapping pipe 12;

[0059] S300, according to the differential pressure determined in S200, the measured flow of the fluid, and compare the measured flow with the expected flow;

[0060] S400, if the measured flow in S300 is not consistent with the expected flow, then adjust the flow control valve according to the comparison result in S300;

[0061] S500, repeat steps S200 to S400;

[0062] S600, if the measured flow in S300 is consistent with the expected flow, then by the drive mechanism, the flow sensor is in second state.

[0063] In some cases, the flow control device is particularly suitable for controlling the flow of oil fume-containing exhaust gas between a range hood and an exhaust flue in a high-rise residential building or the like. In this case, the flow of oil fume-containing exhaust gas of each floor is usually measured separately only when the equipment condition changes, and then the corresponding flow control valve is adjusted according to the measured value until the oil fume-containing exhaust gas of each floor can be normally discharged. It can be seen that the flow measurement of oil fume-containing exhaust gas only needs to be performed intermittently as needed. By using the flow control device of the utility model, the opening 13 of the flow sensor can be exposed to the oil fume-containing exhaust gas only during the measurement period, and the opening 13 is sealed by the sealing piece to isolate it from the oil fume-containing exhaust gas during the long non-measurement period, thereby significantly reducing the adhesion and accumulation of viscous substances in the opening 13 in the oil fume-containing exhaust gas, greatly prolonging the maintenance period of the flow control device, saving a large amount of manpower and material resources, and avoiding excessive interference with the normal life of residents.

[0064] The utility model is obviously not limited to the details of the above exemplary embodiments for those skilled in the art, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the utility model is defined by the appended claims rather than the above description, any reference signs in the claims should not be regarded as limiting the claims involved, and all changes falling within the meaning of the equivalent elements of the claims are covered within the scope of the utility model.

Claims

1. A uniform tube flow sensor comprising at least a pair of pressure takers, one of which is a high pressure taker upstream of the direction of fluid flow and the other of which is a low pressure taker downstream of the direction of fluid flow, each of said high pressure taker and low pressure taker having an opening, and when said uniform tube flow sensor is in a first state in which flow measurement is being performed, the opening of said high pressure taker faces in the direction of fluid flow and the opening of said low pressure taker faces away from the direction of fluid flow, characterized in that, A blocking piece is arranged at each of the openings, and the uniform tube flow sensor further comprises a driving mechanism to drive the high-pressure and low-pressure pressure tubes or the blocking pieces to move, so that when the uniform tube flow sensor is in a first state, the blocking pieces are away from the openings to allow fluid to enter the respective pressure tubes through the openings, and when the uniform tube flow sensor is in a second state without measurement, the blocking pieces block the openings to prevent fluid from entering the respective pressure tubes through the openings.

2. The constant tube flow sensor of claim 1, wherein, The driving mechanism drives the pressure tubes to move so that the blocking pieces are away from or block the openings along the circumferential, longitudinal or radial direction of the pressure tubes, or drives the blocking pieces to move so that the blocking pieces are away from or block the openings along the circumferential, longitudinal or radial direction of the pressure tubes.

3. The constant tube flow sensor according to claim 1 or 2, characterized in that The high-pressure and low-pressure pressure tubes in the at least one pair of pressure tubes are separated from each other, or the high-pressure and low-pressure pressure tubes in the at least one pair of pressure tubes are combined with each other.

4. The constant tube flow sensor of claim 3, wherein, The blocking pieces comprise a first blocking piece wrapped around the high-pressure pressure tube in a semi-enclosing manner and a second blocking piece wrapped around the low-pressure pressure tube in a semi-enclosing manner, the first and second blocking pieces are connected with each other by a connecting piece and clamped between the high-pressure and low-pressure pressure tubes to allow the high-pressure and low-pressure pressure tubes to rotate around their respective axes, so that in the first state, the openings of the high-pressure pressure tube face the fluid flow direction and the openings of the low-pressure pressure tube are away from the fluid flow direction, and in the second state, the openings of the high-pressure pressure tube are away from the fluid flow direction and blocked by the first blocking piece, and the openings of the low-pressure pressure tube face the fluid flow direction and are blocked by the second blocking piece.

5. The constant tube flow sensor of claim 4, wherein, The high-pressure and low-pressure pressure tubes are parallel to each other, a first projection of the first and second blocking pieces and the connecting piece on a fluid cross section exceeds a maximum dimension of a part of a second projection of the high-pressure and low-pressure pressure tubes on the fluid cross section by not more than 1% to 10% of a minimum dimension of the second projection, and an area of the first projection is 1% to 120% of an area of the second projection.

6. The constant tube flow sensor of claim 5, wherein, The high-pressure and low-pressure pressure tubes are separated from each other, a part of the connecting piece between the high-pressure and low-pressure pressure tubes is at least partially hollow, and an area of a third projection of the hollow part on a fluid longitudinal section is 30% to 99% of an area of a fourth projection of an area defined between the high-pressure and low-pressure pressure tubes on the fluid longitudinal section.

7. A uniform pipe flowmeter characterized by, The uniform tube flow sensor comprises a flow guide to guide fluid to flow from upstream to downstream, the uniform tube flow sensor according to any one of claims 1 to 6 installed in the flow guide, a differential pressure meter in fluid communication with the high-pressure and low-pressure pressure tubes to measure a differential pressure therebetween, and optionally a calculation device in communication connection with the differential pressure meter to calculate a corresponding flow rate according to the differential pressure.

8. A flow control device, characterized by The uniform tube flow sensor comprises the uniform tube flow meter according to claim 7, a flow control valve connected with the flow guide of the uniform tube flow meter to control the flow rate of fluid in the flow guide, and optionally a control mechanism in communication connection with the flow control valve, the driving mechanism and the differential pressure meter or the calculation device.

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