Automatic detection system for flow of once-through pump

Abstract

The utility model discloses an automatic flow detection system for a once-through pump. The automatic flow detection system comprises an industrial personal computer, a detected once-through pump, a liquid pressure detection unit, a flow regulation unit and a flow meter, a liquid outlet of the detected direct-current pump is communicated with a liquid inlet of the flow regulating unit through a pipeline, and a liquid outlet of the flow regulating unit is communicated with a liquid inlet of the flowmeter; the liquid pressure detection unit is used for detecting the pressure of a liquid inlet and a liquid outlet of the flow adjusting unit and sending pressure detection values to the industrial personal computer. The industrial personal computer is connected with a controller of the detected direct-current pump in a CAN mode and used for controlling opening, closing and flow adjusting of the detected direct-current pump, a PWM control output interface of the industrial personal computer is connected with a PWM input control interface of the flow adjusting unit, and a flow transmitter interface of the flow meter is connected with a data input interface of the industrial personal computer. The utility model has the advantages that the flow detection range is wide, the automation degree is high, the real-time performance is strong, and the working efficiency of direct current pump model selection and flow real-time detection is greatly improved.

Description

Technical Field

[0001] The utility model relates to an automatic flow detection system, in particular to an automatic flow detection system for a DC pump. Background Art

[0002] With the rapid development of the in vitro diagnostic industry, in vitro diagnostic instruments, especially high-speed, high-throughput in vitro diagnostic automated testing equipment, have higher requirements for the speed and accuracy of liquid extraction, injection, pipetting, needle washing, etc. In order to adapt to high-speed, high-throughput in vitro diagnostic instruments, it is particularly important to select a suitable DC pump model and test its flow accuracy.

[0003] Currently, the existing flow measurement solution for non-speed-adjustable DC pumps uses a gravimetric method. This involves starting a timer when the DC pump is turned on to pump purified water. After a period of time, the weight of the remaining purified water in the bucket is measured to calculate the flow rate per unit time. However, this method is inconvenient to use, inevitably introduces errors when the DC pump is turned on, and the magnitude of these errors cannot be assessed. The operating requirements are too high, making it difficult to ensure accurate measurement. Furthermore, the method is inefficient, time-consuming, and prone to errors during the calculation process. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a DC pump flow automatic detection system to improve the DC pump flow detection accuracy and efficiency.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] The utility model discloses an automatic flow detection system for a DC pump, comprising an industrial computer, a DC pump to be detected, a liquid pressure detection unit, a flow regulating unit and a flow meter; the liquid outlet of the DC pump to be detected is connected to the liquid inlet of the flow regulating unit via a pipeline, and the liquid outlet of the flow regulating unit is connected to the liquid inlet of the flow meter; the liquid pressure detection unit is used to detect the pressure at the liquid inlet and outlet of the flow regulating unit and send the pressure detection value to the industrial computer; the industrial computer is connected to the controller of the DC pump to be detected via a CAN mode and is used to control the opening and closing of the DC pump to be detected and the flow regulation; the PWM control output interface of the industrial computer is connected to the PWM input control interface of the flow regulating unit, and the flow transmitter interface of the flow meter is connected to the data input interface of the industrial computer.

[0007] Furthermore, the liquid pressure detection unit is composed of a first pressure sensor and a second pressure sensor, the first pressure sensor is arranged on the pipe at the liquid inlet of the flow regulating unit, and the second pressure sensor is arranged on the pipe at the liquid outlet of the flow regulating unit. The pressure transmitter interfaces of the first and second pressure sensors are respectively connected to the data input interface of the industrial computer, and the real-time pressure values ​​at the liquid inlet and outlet of the flow regulating unit are sent to the industrial computer.

[0008] Furthermore, the flow regulating unit is a proportional flow valve, and a PWM input control interface of the proportional flow valve is connected to a PWM control output interface of the industrial computer.

[0009] The utility model has the advantages of wide flow detection range, high degree of automation and strong real-time performance, which greatly improves the working efficiency of DC pump selection and real-time flow detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a principle block diagram of the utility model. DETAILED DESCRIPTION

[0011] The following is a detailed description of an embodiment of the present invention in conjunction with the accompanying drawings. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process. However, the protection scope of the present invention is not limited to the following embodiment.

[0012] It should be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "connected" and "connection" that may appear should be understood in a broad sense. For example, it can mean fixed connection, detachable connection, or integral connection; it can mean mechanical connection or electrical connection; it can mean direct connection, indirect connection through an intermediate medium, or internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood based on specific circumstances.

[0013] like Figure 1 As shown, the automatic flow detection system of the DC pump of the present invention includes an industrial computer, a DC pump to be detected, a liquid pressure detection unit, a flow regulating unit and a flow meter; the liquid inlet of the DC pump to be detected is connected to the purified water bucket, the liquid outlet of the DC pump to be detected is connected to the liquid inlet of the flow regulating unit through a pipeline, the liquid outlet of the flow regulating unit is connected to the liquid inlet of the flow meter, and the liquid outlet of the flow meter is connected to the waste liquid bucket.

[0014] The liquid pressure detection unit is used to detect the inlet and outlet pressures of the flow regulation unit and send the real-time detected pressure values ​​to the industrial computer; the industrial computer is connected to the controller of the detected DC pump via CAN, and is used to control the opening, closing and flow regulation of the detected DC pump. The PWM control output interface of the industrial computer is connected to the PWM input control interface of the flow regulation unit, and the flow transmitter interface of the flow meter is connected to the data input interface of the industrial computer.

[0015] Preferably or exemplarily, the liquid pressure detection unit is composed of a first pressure sensor and a second pressure sensor, the first pressure sensor is arranged on the pipe at the liquid inlet of the flow regulating unit, and the second pressure sensor is arranged on the pipe at the liquid outlet of the flow regulating unit. The pressure transmitter interfaces of the first and second pressure sensors are respectively connected to the data input interface of the industrial computer to send the real-time read pressure values ​​at the liquid inlet and outlet of the flow regulating unit to the industrial computer.

[0016] Preferably or exemplarily, the flow regulating unit is a proportional flow valve, a PWM input control interface of the proportional flow valve is connected to a PWM control output interface of an industrial computer, and a valve body of the proportional flow valve adopts a gear pump.

[0017] The detection steps of this utility model are briefly described as follows:

[0018] Step 1: After the system is powered on, the industrial computer sends a command to start the DC pump and proportional flow valve. The first and second pressure sensors read the pressure values ​​of the proportional flow valve inlet and outlet in real time, report them to the host computer through the pressure transmitter, and display the current pressure data on the monitor. The display of the industrial computer is a touch screen that supports both LVDS and HDMI interfaces.

[0019] Step 2: Regulate the flow of the proportional flow valve through the industrial computer. That is, the industrial computer outputs a duty cycle control signal through the built-in PWM controller to adjust the flow of the proportional flow valve so that the readings of the first and second pressure sensors are consistent to ensure detection accuracy.

[0020] Step 3: The flow meter reads the flow counter value in real time and reports it to the host computer through the flow transmitter, and the flow value is directly displayed on the monitor in real time;

[0021] If the DC pump is an adjustable speed DC pump, the host computer sends commands to control the DC pump to operate according to the set flow rate, and the real-time flow rate of the adjustable speed DC pump at different speeds can be read in real time.

Claims

1. A DC pump flow automatic detection system, characterized by: The invention comprises an industrial computer, a DC pump to be tested, a liquid pressure detection unit, a flow regulating unit and a flow meter; the liquid outlet of the DC pump to be tested is connected to the liquid inlet of the flow regulating unit through a pipeline, and the liquid outlet of the flow regulating unit is connected to the liquid inlet of the flow meter; the liquid pressure detection unit is used to detect the pressure of the liquid inlet and outlet of the flow regulating unit and send the pressure detection value to the industrial computer; the industrial computer is connected to the controller of the DC pump to be tested via CAN mode, and is used to control the opening and closing of the DC pump to be tested and the flow regulation; the PWM control output interface of the industrial computer is connected to the PWM input control interface of the flow regulating unit, and the flow transmitter interface of the flow meter is connected to the data input interface of the industrial computer.

2. The automatic detection system for DC pump flow according to claim 1, characterized in that: The liquid pressure detection unit is composed of a first pressure sensor and a second pressure sensor. The first pressure sensor is arranged on the pipe at the liquid inlet of the flow regulating unit, and the second pressure sensor is arranged on the pipe at the liquid outlet of the flow regulating unit. The pressure transmitter interfaces of the first and second pressure sensors are respectively connected to the data input interface of the industrial computer.

3. The automatic detection system for DC pump flow rate according to claim 1 or 2, characterized in that: The flow regulating unit is a proportional flow valve, and the PWM input control interface of the proportional flow valve is connected to the PWM control output interface of the industrial computer.

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