Flow measuring device

Abstract

The utility model discloses a flow measuring device which comprises a first flow meter, a second flow meter and a flow monitoring device which are arranged in a pipeline, the measuring range of the first flow meter is larger than that of the second flow meter, the flow monitoring device is used for detecting the flow in the pipeline, and a preset value is set in the flow monitoring device. The preset value is smaller than the measuring range of the first flowmeter; the flow monitoring device has two states, when the actual flow in the pipeline is larger than a preset value, the flow monitoring device is in the first state, and when the actual flow in the pipeline is smaller than the preset value, the flow monitoring device is in the second state. The medium flow can be respectively and accurately measured regardless of the size of the medium flow, the phenomena of flow measurement errors and distortion are eliminated, energy measurement is more accurate, and cost analysis is specific and easy to control.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flow measurement, in particular to a flow measurement device. BACKGROUND

[0002] With the increasingly detailed control of enterprise costs, the accuracy of energy measurement is gradually improved. At present, a flow meter installed on a pipeline can achieve accurate monitoring of normal flow, but when the actual flow is less than one third of the flow range, the value will have an error, and sometimes the flow signal is too small to be cut off as a small signal, causing flow distortion. This phenomenon often causes great disturbance to measurement or cost analysis, affecting the formulation of cost plan and cost indicators. CONTENT OF THE INVENTION

[0003] Therefore, the present application provides a flow measurement device to solve the problem of inaccurate small flow measurement in the prior art.

[0004] In order to achieve the above purpose, the present application provides the following technical solutions:

[0005] A flow measurement device, comprising a first flow meter, a second flow meter and a flow monitoring device arranged in a pipeline, the range of the first flow meter is greater than the range of the second flow meter, the flow monitoring device is used to detect the flow size in the pipeline, and is internally provided with a predetermined value, the predetermined value is less than the range of the first flow meter;

[0006] The flow monitoring device itself contains two states, when the actual flow in the pipeline is greater than the predetermined value, the flow monitoring device is in a first state, and when the actual flow in the pipeline is less than the predetermined value, the flow monitoring device is in a second state.

[0007] Optionally, the flow monitoring device is a flow switch.

[0008] Optionally, in the first state, the flow switch is in an open state; in the second state, the flow switch is in a closed state.

[0009] Optionally, it further comprises an editable logic controller, the first flow meter, the second flow meter and the flow monitoring device are electrically connected with the editable logic controller, and the editable logic controller collects the value of the first flow meter or the second flow meter according to the different states of the flow monitoring device.

[0010] Optionally, when the flow monitoring device is in the first state, the editable logic controller collects the measurement value of the first flow meter; when the flow monitoring device is in the second state, the editable logic controller collects the measurement value of the second flow meter.

[0011] Optionally, the editable logic controller is connected with the industrial computer and the energy metering and control center network in sequence, and is used for transmitting data.

[0012] Optionally, the range of the second flow meter is one third of the range of the first flow meter.

[0013] Optionally, the preset value of the flow monitoring device is equal to one third of the range of the first flow meter.

[0014] Compared with the prior art, the application has at least the following beneficial effects:

[0015] 1. Compared with the prior art, the application can accurately measure the flow regardless of the size of the medium flow, eliminate the error and distortion of the flow measurement, and make the energy metering more accurate and the cost analysis more controllable.

[0016] 2. By the state change of the flow monitoring device, the actual flow in the pipeline can be directly known, so that the appropriate value between the first flow meter and the second flow meter can be selected to obtain a more accurate measurement result. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more directly illustrate the prior art and the application, the following exemplary drawings are given. It should be understood that the specific shape, structure shown in the drawings should not be regarded as a limitation condition for realizing the application; for example, based on the technical concept and exemplary drawings disclosed in the application, those skilled in the art can easily make conventional adjustments or further optimization on the increase / decrease / attribute division of some units (components), specific shape, positional relationship, connection mode, size ratio relationship, etc.

[0018] Figure 1 A structural principle schematic diagram of a flow measurement device provided by the first embodiment of the application is shown in the figure.

[0019] Figure 2 A structural principle schematic diagram of a flow measurement device provided by the second embodiment of the application is shown in the figure.

[0020] Explanation of reference signs:

[0021] 1. pipeline; 2. first flow meter; 3. second flow meter; 4. flow monitoring device; 5. editable logic controller; 6. industrial computer; 7. energy metering and control center; 8. production line; 9. main motor. DETAILED DESCRIPTION

[0022] The application will be further described in detail below with reference to the accompanying drawings.

[0023] In the description of the present application: unless otherwise specified, the meaning of "a plurality" is two or more. The terms "first", "second", "third" and the like in the present application are intended to distinguish the objects referred to, and do not have a special meaning in the technical connotation aspect (for example, it should not be understood as emphasizing importance or order, etc.). The expressions "include", "contain", "have" and the like also mean "not limited to" (certain units, components, materials, steps, etc.).

[0024] The terms such as "upper", "lower", "left", "right", "intermediate" and the like referred to in the present application are generally made for the purpose of indicating the relative position relationship for easy understanding by referring to the drawings, and are not an absolute limitation on the position relationship in the actual product.

[0025] Embodiment one

[0026] A flow measuring device, with reference to Figure 1 , comprising a first flow meter 2, a second flow meter 3 and a flow monitoring device 4 arranged on the original medium pipeline 1. The range of the first flow meter 2 is greater than the range of the second flow meter 3, and the flow monitoring device 4 is used to detect the flow size in the pipeline 1, which is internally provided with a predetermined value, which is less than the range of the first flow meter 2.

[0027] The flow monitoring device 4 itself contains two states, when the actual flow in the pipeline 1 is greater than the predetermined value, the flow monitoring device 4 is in the first state, when the actual flow in the pipeline 1 is less than the predetermined value, the flow monitoring device 4 is in the second state.

[0028] In order to improve the measurement accuracy, the range of the second flow meter 3 is set to one third of the range of the first flow meter 2, for example, the range of the first flow meter 2 is 0-Q (Q is the upper limit of the design flow range of the medium pipeline 1), then the range of the second flow meter 3 is 0-1 / 3Q. Correspondingly, the predetermined value of the flow monitoring device 4 is also one third of the range value of the first flow meter 2.

[0029] In the present application, the flow monitoring device 4 is a flow switch. When the actual flow value in the pipeline 1 is greater than the predetermined value, the flow switch is in the first state, i.e. the open state. When the actual flow value in the pipeline 1 is less than the predetermined value, the flow switch is in the second state, i.e. the closed state. Here, the opening and closing of the flow switch are only two different states of the flow switch itself, which does not affect the normal operation of the original medium pipeline 1.

[0030] Further, the flow measuring device further comprises an editable logic controller 5, the first flow meter 2, the second flow meter 3 and the flow monitoring device 4 are electrically connected with the editable logic controller 5, and the editable logic controller 5 collects the value of the first flow meter 2 or the second flow meter 3 according to the different states of the flow monitoring device 4.

[0031] When the flow switch is in the open state, it indicates that the actual flow in the raw medium pipeline 1 is greater than a predetermined value, and the programmable logic controller 5 collects the display value on the flow meter with a larger range, that is, the measurement value of the first flow meter 2 is used as the standard.

[0032] When the flow switch is in the closed state, it indicates that the actual flow in the raw medium pipeline 1 is less than a predetermined value, that is, less than one-third of the range of the first flow meter 2. At this time, the actual flow signal is too small to be considered as a small signal cut-off with respect to the first flow meter 2. Therefore, the programmable logic controller 5 collects the display value on the flow meter with a smaller range, that is, the measurement value of the second flow meter 3 is used as the standard, so as to make the measurement accurate and provide favorable data support for production.

[0033] The programmable logic controller 5 is connected with the industrial computer 6 and the energy metering and control center 7 in sequence and is used for transmitting data. The programmable logic controller 5 collects the value of the first flow meter 2 or the second flow meter 3 according to different states of the flow switch, and displays the real-time flow in the industrial computer 6. The value is transmitted to the energy metering and control system through the communication network of the industrial computer 6 and the energy metering center to participate in the metering and statistical work.

[0034] Embodiment two

[0035] A flow measurement device, referring to Figure 2 On the basis of embodiment one, a flow acquisition mode is added, which can select the first flow meter 2 or the second flow meter 3 by calculating the proportion of user use, as follows:

[0036] The running states of all main motors 9 on the production line 8 are communicated with the programmable logic controller 5. The programmable logic controller 5 calculates the ratio of the running number to the total number of the production line 8 by collecting the running states of the main motors 9 on the production line 8. A predetermined ratio, such as 1 / 3, is set. When the value calculated by the programmable logic controller 5 is greater than 1 / 3, the programmable logic controller 5 selects the value of the first flow meter 2, otherwise, when the value calculated by the programmable logic controller 5 is less than 1 / 3, the programmable logic controller 5 selects the value of the second flow meter 3.

[0037] In specific implementation, the staff can select one of the two acquisition modes on the industrial computer 6. Under normal circumstances, the flow monitoring device 4 is used as the acquisition standard, and when the flow monitoring device 4 fails, the data selection mode in this embodiment is selected.

[0038] Any technical features in the above embodiments can be combined (as long as the combinations of the technical features do not contradict each other), and for the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; the embodiments not explicitly written in the above description should also be considered as the scope of the present disclosure.

Claims

1. A flow measurement device, characterized in that: The invention comprises a first flow meter (2), a second flow meter (3) and a flow monitoring device (4) arranged in a pipeline (1); the measuring range of the first flow meter (2) is greater than the measuring range of the second flow meter (3); the flow monitoring device (4) is used to detect the flow rate in the pipeline (1); a predetermined value is set inside the device; the predetermined value is smaller than the measuring range of the first flow meter (2); The flow monitoring device (4) itself has two states. When the actual flow in the pipeline (1) is greater than a predetermined value, the flow monitoring device (4) is in a first state. When the actual flow in the pipeline (1) is less than the predetermined value, the flow monitoring device (4) is in a second state.

2. The flow measurement device according to claim 1, characterized in that: The flow monitoring device (4) is a flow switch.

3. The flow measurement device according to claim 2, characterized in that: In the first state, the flow switch is in an open state; in the second state, the flow switch is in a closed state.

4. The flow measurement device according to claim 1, characterized in that: The invention also includes an editable logic controller (5), wherein the first flow meter (2), the second flow meter (3) and the flow monitoring device (4) are all electrically connected to the editable logic controller (5), and the editable logic controller (5) collects the value of the first flow meter (2) or the second flow meter (3) according to the different states of the flow monitoring device (4).

5. The flow measurement device according to claim 4, characterized in that: When the flow monitoring device (4) is in a first state, the editable logic controller (5) collects the measured value of the first flow meter (2); when the flow monitoring device (4) is in a second state, the editable logic controller (5) collects the measured value of the second flow meter (3).

6. The flow measurement device according to claim 4, characterized in that: The editable logic controller (5) is connected to the industrial computer (6) and the energy metering control center (7) in sequence through a network for transmitting data.

7. The flow measurement device according to claim 1, characterized in that: The measuring range of the second flow meter (3) is one third of the measuring range of the first flow meter (2).

8. The flow measurement device according to claim 7, characterized in that: The preset value of the flow monitoring device (4) is equal to one third of the measuring range of the first flow meter (2).

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