Liquid level monitoring system of liquid storage barrel for testing water pump

Abstract

The utility model provides a liquid level monitoring system of a liquid storage barrel for testing a water pump, and the system comprises a liquid level meter which is communicated with the liquid storage barrel, the interior of the liquid level meter is provided with a magnetic floater, and the top of the liquid level meter is provided with a variable reluctance type sensor; the control terminal comprises a processing unit, the input end of the control terminal is electrically connected with the output end of the variable reluctance type sensor, and the output end of the control terminal is connected with a liquid conveying unit; the liquid inlet end of the liquid conveying unit is connected with a liquid injection barrel; and the liquid outlet end of the liquid conveying unit is connected with the liquid storage barrel. According to the technical scheme, the variable reluctance type sensor is arranged at the liquid level meter to record the position of the magnetic floater floating along with the liquid level, and the electric signal generated in the process is loaded to the control terminal to control the liquid conveying unit so as to achieve the liquid supplementing operation of the liquid storage barrel. Therefore, the monitoring result can be responded in real time, and the timeliness of monitoring is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of water pump testing, in particular to a liquid level monitoring system of a liquid storage barrel for water pump testing. Background Art

[0002] After the processing and manufacturing of the water pump, a durability test is required, which is to simulate the working state in the actual use environment to identify the durability and reliability of the product. The equipment required for the durability test includes a liquid storage tank to provide water for the water pump to circulate water. Usually, the liquid storage height of the liquid storage tank needs to be manually monitored to prevent the liquid storage tank from being short of liquid and affecting the smooth progress of the test.

[0003] However, there are also some shortcomings in the manual monitoring method. The liquid level gauge used in the liquid storage tank is usually a red and white flip column structure, which uses the buoyancy and magnetism of the magnetic float to flip at the specified liquid level for manual reading. However, the reading process is time-consuming and difficult to respond in time, which affects the timeliness of monitoring. Utility Model Content

[0004] The utility model provides a liquid level monitoring system for a liquid storage barrel for testing a water pump, aiming to automatically realize liquid level monitoring and disposal and ensure the timeliness of monitoring.

[0005] The present invention provides a liquid level monitoring system for a liquid storage tank for testing a water pump, comprising:

[0006] The liquid level gauge is connected to the liquid storage tank, a magnetic float is arranged inside the liquid level gauge, and a variable magnetic resistance sensor is arranged on the top of the liquid level gauge;

[0007] The control terminal includes a processing unit, an input end of which is electrically connected to an output end of a variable magnetoresistive sensor, an output end of which is connected to a liquid delivery unit; a liquid inlet end of the liquid delivery unit is connected to a liquid injection barrel; and a liquid outlet end of the liquid delivery unit is connected to a liquid storage barrel.

[0008] Optionally, the variable reluctance sensor includes an iron core and an electromagnetic coil wound around the iron core.

[0009] Optionally, a signal amplification circuit is provided between the variable reluctance sensor and the processing unit.

[0010] Optionally, the control terminal also includes an alarm and a display.

[0011] Optionally, the liquid level gauge is preset with a maximum liquid level and a minimum liquid level.

[0012] Optionally, the processing unit is a PLC, which is electrically connected to an external host computer.

[0013] Optionally, the liquid inlet end of the liquid delivery unit is connected to a liquid injection barrel.

[0014] Optionally, the variable reluctance sensor includes an armature, and a gap is provided between the armature and the iron core.

[0015] The embodiment of the utility model provides a liquid level monitoring system for a liquid storage barrel for testing a water pump. A variable reluctance sensor is arranged at the liquid level meter to record the position of a magnetic float as the liquid level floats, and the electrical signal generated in this process is loaded into a control terminal to control a liquid delivery unit to achieve a liquid replenishment operation on the liquid storage barrel. Due to the use of electrical signals, a real-time response can be made to the monitoring results, thereby ensuring the timeliness of the monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A structural principle diagram of a liquid level monitoring system for a liquid storage tank for water pump testing provided by an embodiment of the utility model;

[0017] Figure 2 A structural principle diagram of a variable reluctance sensor in a liquid level monitoring system of a liquid storage barrel for water pump testing provided by an embodiment of the utility model.

[0018] In the figure: 1. Liquid level meter; 2. Liquid storage barrel; 3. Magnetic float; 4. Variable reluctance sensor; 5. Control terminal; 6. Processing unit; 7. Liquid delivery unit; 8. Iron core; 9. Electromagnetic coil; 10. Signal amplification circuit; 11. Alarm; 12. Display; 13. Liquid filling barrel; 14. Armature. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0020] The durability test of existing water pumps is carried out by manually monitoring the liquid level and taking countermeasures based on the monitoring results. However, the above-mentioned disposal method is time-consuming and reduces the timeliness of monitoring. Therefore, a liquid level monitoring system is needed that can respond in real time based on the monitoring results.

[0021] Embodiment 1

[0022] In view of the above shortcomings, the utility model proposes a liquid level monitoring system for a liquid storage tank for water pump testing, such as Figure 1 As shown, including:

[0023] The liquid level meter 1 is connected to the liquid storage barrel 2. A magnetic float 3 is provided inside the liquid level meter 1. A variable magnetoresistive sensor 4 is provided on the top of the liquid level meter 1. The liquid level meter 1 is preset with a maximum liquid level and a minimum liquid level. The magnetic float 3 floats between the maximum liquid level and the minimum liquid level as the liquid level in the liquid storage barrel 2 changes. In the process, the distance between the magnetic float 3 and the variable magnetoresistive sensor 4 changes, resulting in an induced current in the variable magnetoresistive sensor 4. Specifically, the variable magnetoresistive sensor 4 includes an iron core 8 and an electromagnetic coil 9 wound around the iron core 8. In addition, as Figure 2 As shown, the variable reluctance sensor 4 includes an armature 14, and a gap is provided between the armature 14 and the iron core 8. The variable reluctance sensor 4 also includes a motion detection device connected to the armature 14; when the position between the magnetic float 3 and the armature 14 changes, the magnetic resistance of the magnetic circuit formed by the iron core 8 and the electromagnetic coil 9 changes, which in turn causes the inductance in the electromagnetic coil 9 to change, thereby generating an induced current, which is loaded on the control terminal 5 as an electrical signal.

[0024] The control terminal 5 includes a processing unit 6, whose input end is electrically connected to the output end of the variable reluctance sensor 4, and whose output end is connected to a liquid delivery unit 7; the liquid delivery unit includes but is not limited to a water pump with a motor; the liquid inlet end of the liquid delivery unit 7 is connected to a liquid injection barrel 13; and the liquid outlet end of the liquid delivery unit 7 is connected to a liquid storage barrel 2. The processing unit 6 can be a PLC, which is pre-programmed and can generate corresponding control instructions according to the induced current fed back by the variable reluctance sensor 4, and the PLC is electrically connected to an external host computer, so as to use human instructions to intervene in case of failure of the liquid delivery unit 7 to avoid unexpected situations.

[0025] The induced current generated by the variable reluctance sensor 4 used above may be small, so it is necessary to set a signal amplification circuit 10 between the variable reluctance sensor 4 and the processing unit 6. The amplification factor is usually a fixed value to facilitate the safe reception of the PLC. The control terminal 5 also includes an alarm 11 and a display 12 to prompt in abnormal conditions. For example, when the magnetic float 3 reaches the lowest liquid level, the PLC will determine the state of lack of liquid based on the induced current. The alarm 11 will sound an alarm and display the liquid level at this time through the display 12, driving the liquid delivery unit 7 to draw water from the injection barrel 13 and inject it into the liquid storage barrel 2; correspondingly, when the magnetic float 3 reaches the highest liquid level, the PLC will determine the highest liquid level based on the induced current, sound an alarm through the alarm 11 and stop the liquid delivery unit 7 from working.

[0026] It should be added here that the alarm 11 can also be used to monitor whether there is a fault in the circuit of the control terminal 5. For example, when the magnetic float 3 reaches the minimum liquid level, the PLC stops the liquid delivery unit 7. At this time, the alarm 11 is used to prompt the staff to perform manual operation through the host computer to correct the fault.

[0027] The embodiment of the utility model provides a liquid level monitoring system for a liquid storage barrel for testing a water pump. A variable reluctance sensor is arranged at the liquid level meter to record the position of a magnetic float as the liquid level floats, and the electrical signal generated in this process is loaded into a control terminal to control a liquid delivery unit to achieve a liquid replenishment operation on the liquid storage barrel. Due to the use of electrical signals, a real-time response can be made to the monitoring results, thereby ensuring the timeliness of the monitoring.

[0028] Some directional words are defined in the present utility model. Unless otherwise specified, the directional words used, such as "up", "down", "left", "right", "inside" and "outside", are used for ease of understanding and therefore do not constitute limitations on the protection scope of the present utility model.

[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A liquid level monitoring system for a liquid storage tank for water pump testing, characterized in that: include: A liquid level meter (1) is connected to the liquid storage barrel (2), a magnetic float (3) is provided inside the liquid level meter (1), and a variable magnetic resistance sensor (4) is provided on the top of the liquid level meter (1); The control terminal (5) comprises a processing unit (6), an input end of which is electrically connected to the output end of the variable magnetic resistance sensor (4), and the output end is connected to a liquid delivery unit (7); the liquid outlet end of the liquid delivery unit (7) is connected to the liquid storage barrel (2).

2. The liquid level monitoring system for the liquid storage tank for water pump testing according to claim 1 is characterized in that: The variable reluctance sensor (4) comprises an iron core (8) and an electromagnetic coil (9) wound around the iron core (8).

3. The liquid level monitoring system for a liquid storage tank for water pump testing according to claim 1, characterized in that: A signal amplification circuit (10) is provided between the variable reluctance sensor (4) and the processing unit (6).

4. The liquid level monitoring system for a liquid storage tank for water pump testing according to claim 1, characterized in that: The control terminal (5) also includes an alarm (11) and a display (12).

5. The liquid level monitoring system for a liquid storage tank for water pump testing according to claim 1, characterized in that: The liquid level meter (1) is preset with a maximum liquid level and a minimum liquid level.

6. The liquid level monitoring system for a liquid storage tank for water pump testing according to claim 1, characterized in that: The processing unit (6) is a PLC, which is electrically connected to an external host computer.

7. The liquid level monitoring system for a liquid storage tank for water pump testing according to claim 1, characterized in that: The liquid inlet end of the liquid delivery unit (7) is connected to a liquid injection barrel (13).

8. The liquid level monitoring system for a liquid storage tank for water pump testing according to claim 2, characterized in that: The variable magnetoresistive sensor (4) comprises an armature (14), and a gap is provided between the armature (14) and the iron core (8).

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