阅读说明：本技术 一种液位开关自动检测装置及方法 (Automatic detection device and method for liquid level switch ) 是由 凌勇 王军 李俊 翟志强 康扬 罗兴涛 刘爽 于 2019-09-04 设计创作，主要内容包括：本发明公开了一种液位开关自动检测装置和方法。该液位开关自动检测装置包括测水位水箱、距离传感器和控制器,所述测水位水箱内置有待检测的液位开关和标定浮漂的测水位水箱,其中液位开关包括可随测水位水箱液位高度变化而移动的浮子；所述距离传感器用于测量浮子和标定浮漂分别相对于测水位水箱的底部的高度；所述控制器一方面用于控制测水位水箱内的液位高度变化,另一方面用于根据距离传感器采集的浮子和标定浮漂分别相对于测水位水箱的底部的高度确定所述测水位水箱的液位高度变化量,并根据液位高度变化量计算液位开关的动作液差和恢复液差,以及根据所述动作液差和恢复液差来判断液位开关是否合格。(The invention discloses a device and a method for automatically detecting a liquid level switch. The automatic detection device for the liquid level switch comprises a water level measuring water tank, a distance sensor and a controller, wherein the water level measuring water tank is internally provided with the liquid level switch to be detected and a water level measuring water tank for calibrating a float, and the liquid level switch comprises a floater capable of moving along with the liquid level height change of the water level measuring water tank; the distance sensor is used for measuring the height of the floater and the height of the calibration floater relative to the bottom of the water level measuring water tank respectively; the controller is used for controlling liquid level height change in the water level measuring tank on one hand, and determining liquid level height change of the water level measuring tank according to the heights of the floater and the calibration floater collected by the distance sensor relative to the bottom of the water level measuring tank on the other hand, calculating action liquid difference and recovery liquid difference of the liquid level switch according to the liquid level height change, and judging whether the liquid level switch is qualified or not according to the action liquid difference and the recovery liquid difference.)

1. An automatic detection device for a liquid level switch, comprising:

the water level measuring device comprises a water level measuring water tank (2), wherein a liquid level switch (3) to be detected and a calibration float (4) for representing the liquid level height in the water level measuring water tank (2) are arranged in the water level measuring water tank; wherein the liquid level switch (3) comprises a floater (32) which can move along with the liquid level height change of the water level measuring water tank (2);

-distance sensors arranged for measuring the distance of the float (32) and the calibration float (4), respectively, with respect to the bottom of the water level tank (2);

and the controller is arranged for controlling the liquid level height change in the water level measuring tank (2) on one hand, determining the liquid level height change of the water level measuring tank (2) according to the distances, acquired by the distance sensor, of the floater (32) and the calibration float (4) relative to the bottom of the water level measuring tank (2) on the other hand, calculating the action liquid difference and the recovery liquid difference of the liquid level switch (3) according to the liquid level height change, and judging whether the liquid level switch (3) is qualified or not according to whether the action liquid difference and the recovery liquid difference are simultaneously within the range of the action liquid difference threshold and the recovery liquid difference threshold.

2. The automatic detection device for the liquid level switch as claimed in claim 1, further comprising a water storage tank (1), wherein a drain pipe and a drain pump (5) arranged on the drain pipe are installed between the water storage tank (1) and the water level measuring tank (2), and a water supply pipe and a water supply pump (6) arranged on the water supply pipe are also installed between the water storage tank (1) and the water level measuring tank (2);

the controller is connected with the drainage pump (5) and the water supply pump (6) and is used for controlling the drainage pump (5) and the water supply pump (6) to work, so that the liquid level height of the water level measuring tank (2) is changed.

3. The automatic detection device of the liquid level switch as claimed in claim 2, characterized in that the water level measuring tank (2) comprises a water pipe chamber, a liquid level switch chamber and a calibration float chamber which are communicated with each other at the bottom, wherein the water pipe chamber is used for placing the water supply pipe and the water discharge pipe, and the liquid level switch chamber is used for placing the liquid level switch (3); the calibration buoy room is used for placing the calibration buoy (4).

4. The automatic detection device of a liquid level switch as claimed in claim 1,

the liquid level switch comprises a rod body (31) extending along the direction vertical to the bottom of the water level measuring tank, and the floater (34) can move up and down along the rod body (31) along with the liquid level height change of the water level measuring tank;

in an initial state, the liquid level of the water level measuring water tank (2) is lower than the lower end surface of the liquid level switch (3), and the floater (32) is positioned at the lower end of the rod body (31).

5. The automatic detection device of a liquid level switch as claimed in claim 1,

the distance sensor comprises a first sensor (9) and a second sensor (10) which are respectively used for measuring the distance between the lower surface of the floater (32) and the lower surface of the calibration float (4) relative to the bottom of the water level measuring water tank (2).

6. The automatic detection device of the level switch according to claim 5, characterized in that said first sensor (9) and second sensor (10) are respectively arranged on both sides of a rotating table (11) below said water level tank (2) and respectively arranged directly below a float (32) of said level switch (3) and said calibration float (4).

7. The automatic detection device of claim 6, characterized in that said rotary table (11) is arranged to enable the first sensor (9) and the second sensor (10) to change their position with respect to each other by rotating itself.

8. An automatic detection method for a liquid level switch, which is applied to the automatic detection device for a liquid level switch according to any one of claims 1 to 7, and comprises the following steps:

controlling the liquid level height change of the water level measuring water tank (2), determining the liquid level height change quantity of the water level measuring water tank (2) according to the distances between the floater (32) and the calibration float (4) relative to the bottom of the water level measuring water tank (2), and calculating the action liquid difference and the recovery liquid difference of the liquid level switch (3) based on the liquid level height change quantity;

and judging whether the liquid level switch (3) is qualified or not according to whether the action liquid difference and the recovery liquid difference are simultaneously within the range of the action liquid difference threshold and the recovery liquid difference threshold.

9. The method for automatically detecting a liquid level switch as claimed in claim 8, wherein the method for controlling the liquid level height change of the water level measuring tank (2), determining the liquid level height change of the water level measuring tank (2) according to the distances between the floater (32) and the calibration floater (4) relative to the bottom of the water level measuring tank (2), and calculating the action liquid difference and the recovery liquid difference of the liquid level switch (3) based on the liquid level height change comprises the following steps:

controlling the liquid level of the water level measuring water tank (2) to be lower than the lower end face of the liquid level switch (3), and detecting the distance between the lower surface of the floater (32) and the bottom of the water level measuring water tank (2) to obtain the initial liquid level h1 of the water level measuring water tank (2);

controlling the liquid level of the water level measuring water tank (2) to increase, detecting the distance between the lower surface of the calibration float (4) and the bottom of the water level measuring water tank (2) when the liquid level switch (3) operates, obtaining the liquid level height h2, and calculating the operating liquid difference delta h1 of the liquid level switch (3) to be h2-h 1;

the liquid level of the water level measuring water tank (2) is controlled to be lowered, the distance between the lower surface of the calibration float (4) and the bottom of the water level measuring water tank (2) when the liquid level switch (3) is recovered is detected, the liquid level height h3 is obtained, and the recovery liquid difference delta h2 of the liquid level switch (3) is calculated to be h3-h 1.

10. The method for automatically detecting a liquid level switch as claimed in claim 9, wherein the step of obtaining the initial height h1 of the liquid level of the water tank (2) comprises the following steps:

controlling the liquid level of the water level measuring tank (2) to be lower than the lower end surface of the liquid level switch (3), measuring the distance between the lower surface of the floater (32) and the bottom of the water level measuring tank (2) by using the first sensor (9), then replacing the positions of the first sensor (9) and the second sensor (10) with each other, measuring the distance between the lower surface of the floater (32) and the bottom of the water level measuring tank (2) by using the second sensor (10),

and (4) carrying out calibration according to the distance values measured twice, and obtaining the initial height h1 of the liquid level after calibration.

Technical Field

The invention relates to an automatic detection device and method for a liquid level switch, in particular to an automatic detection device and method for a liquid level switch used for an air conditioner drainage device.

Background

In summer, when the air conditioner is used for refrigerating, because the air conditioner needs to simultaneously consider two functions of cooling and dehumidifying, a large amount of condensed water can be discharged outside the air conditioner. If the condensed water can not be discharged from the unit in time, the condensed water is finally accumulated too much and overflows the unit, so that the problem of water dripping or water leakage of the air conditioner internal unit is caused, and loss and inconvenience are caused to users. At present, most of air conditioners are internally provided with a drainage pump, and the drainage pump is used for discharging condensed water collected in a water receiving tray.

Therefore, the air conditioner indoor unit is usually provided with a water outlet, and water is discharged to a position lower than the air conditioner indoor unit, such as an outdoor position, through the water outlet pipe by gravity. However, due to the installation environment, it is sometimes necessary to drain the condensed water to a place higher than the installation position of the air conditioner indoor unit, and in this case, it is necessary to drain the water by a built-in drain pump. In the prior art, taking a courtyard machine air conditioner internal unit as an example, the liquid level is mainly detected through a floating ball type liquid level switch, and the floating ball type liquid level switch is mainly characterized by comprising a rod with a floater, wherein the floater moves up and down when receiving liquid level buoyancy in a limited space on the rod along with the change of the liquid level, the liquid level height is converted into an electric signal and then fed back to a main board, and the main board sends a switching instruction to a water pump according to the obtained signal and air conditioner control logic. The water level is detected by the liquid level switch in the industry for a long time.

However, the air conditioner drainage system in the prior art is easy to have the problem that the water pump idles or the drainage is not timely, and the control of the drainage water pump in the prior art is greatly influenced by the operation mode of the air conditioner and has low precision. The reason is that the precision of the liquid level switch of the air conditioner drainage system in the prior art is possibly inaccurate after the liquid level switch is used for a period of time, or the precision is inaccurate due to production and manufacturing, so that the air conditioner starts the water pump and reports the water full protection fault after the liquid level switch reaches an upper limit liquid level action point and lasts for a period of time; this kind of condition probably causes the drainage untimely, and water flows to the outside, causes environmental pollution, and when liquid level switch reachd lower limit liquid level recovery point, the water pump just stops after lasting a period of time that draws water again, leads to the water pump to idle running a period of time, and this kind of condition can produce the noise on the one hand, and on the other hand also causes the energy waste.

The consistency of the action of the contacts in the liquid level switch can ensure the reliability of the drainage action of the water pump when each air conditioner is full of water. No related tool in the market at present can meet the requirement for detecting the liquid level switch action liquid difference and the recovery liquid difference, and a liquid level switch action and recovery liquid difference informatization detection device is urgently needed to be developed so as to meet the inspection requirement.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the automatic detection device and the method for the liquid level switch can detect the liquid level switch action liquid difference and the recovery liquid difference, ensure the consistency of the action of the contacts in the liquid level switch, and further ensure the reliability of the drainage action of the water pump when each air conditioner is full of water.

In order to solve the above technical problem, the present invention provides an automatic detection device for a liquid level switch, comprising:

the water level measuring device comprises a water level measuring water tank (2), wherein a liquid level switch (3) to be detected and a calibration float (4) for representing the liquid level height in the water level measuring water tank (2) are arranged in the water level measuring water tank; wherein the liquid level switch (3) comprises a floater (32) which can move along with the liquid level height change of the water level measuring water tank (2);

-distance sensors arranged for measuring the distance of the float (32) and the calibration float (4), respectively, with respect to the bottom of the water level tank (2);

and the controller is arranged for controlling the liquid level height change in the water level measuring tank (2) on one hand, determining the liquid level height change of the water level measuring tank (2) according to the distances, acquired by the distance sensor, of the floater (32) and the calibration float (4) relative to the bottom of the water level measuring tank (2) on the other hand, calculating the action liquid difference and the recovery liquid difference of the liquid level switch (3) according to the liquid level height change, and judging whether the liquid level switch (3) is qualified or not according to whether the action liquid difference and the recovery liquid difference are simultaneously within the range of the action liquid difference threshold value and the recovery liquid difference threshold value.

According to the embodiment of the invention, the device also comprises a water storage tank (1), a drain pipe and a drain pump (5) arranged on the drain pipe are arranged between the water storage tank (1) and the water level measuring tank (2), and a water supply pipe and a water supply pump (6) arranged on the water supply pipe are also arranged between the water storage tank (1) and the water level measuring tank (2);

the controller is connected with the drainage pump (5) and the water supply pump (6) and is used for controlling the drainage pump (5) and the water supply pump (6) to work, so that the liquid level height of the water level measuring tank (2) is changed.

According to the embodiment of the invention, the water level measuring water tank (2) comprises a water pipe room, a liquid level switch room and a calibration float room, wherein the bottoms of the water pipe room, the liquid level switch room and the calibration float room are communicated, the water pipe room is used for placing the water supply pipe and the water discharge pipe, and the liquid level switch room is used for placing the liquid level switch (3); the calibration buoy room is used for placing the calibration buoy (4).

According to the embodiment of the invention, the liquid level switch comprises a rod body (31) extending along the direction vertical to the bottom of the water level measuring tank, and the floater (34) can move up and down along the rod body (31) along with the liquid level height change of the water level measuring tank;

in an initial state, the liquid level of the water level measuring water tank (2) is lower than the lower end surface of the liquid level switch (3), and the floater (32) is positioned at the lower end of the rod body (31).

According to an embodiment of the invention, the distance sensor comprises a first sensor (9) and a second sensor (10) for measuring the distance of the lower surface of the float (32) and the lower surface of the calibration float (4) relative to the bottom of the water level measuring tank (2), respectively.

According to an embodiment of the invention, the first sensor (9) and the second sensor (10) are respectively arranged on both sides of a rotating platform (11) below the water level measuring water tank (2) and are respectively arranged right below a float (32) of the liquid level switch (3) and the calibration float (4).

According to an embodiment of the invention, the rotary table (11) is arranged to enable the first sensor (9) and the second sensor (10) to change their position by rotating themselves.

According to another embodiment of the invention, the calibration float is an opaque surface float, and the water level measuring water tank is a transparent water tank; the first sensor (9) and the second sensor (10) are respectively arranged on the bottom in the water level measuring water tank.

In addition, the invention also provides an automatic detection method of the liquid level switch, which is applied to the automatic detection device of the liquid level switch, and the automatic detection method of the liquid level switch comprises the following steps:

controlling the liquid level height change of the water level measuring water tank (2), determining the liquid level height change quantity of the water level measuring water tank (2) according to the distances between the floater (32) and the calibration float (4) relative to the bottom of the water level measuring water tank (2), and calculating the action liquid difference and the recovery liquid difference of the liquid level switch (3) based on the liquid level height change quantity;

and judging whether the liquid level switch (3) is qualified or not according to whether the action liquid difference and the recovery liquid difference are simultaneously within the range of the action liquid difference threshold and the recovery liquid difference threshold.

According to the embodiment of the invention, the step of controlling the liquid level height change of the water level measuring tank (2), determining the liquid level height change of the water level measuring tank (2) according to the distances between the floater (32) and the calibration floater (4) relative to the bottom of the water level measuring tank (2), and calculating the action liquid difference and the recovery liquid difference of the liquid level switch (3) based on the liquid level height change specifically comprises the following steps:

controlling the liquid level of the water level measuring water tank (2) to be lower than the lower end face of the liquid level switch (3), and detecting the distance between the lower surface of the floater (32) and the bottom of the water level measuring water tank (2) to obtain the initial liquid level h1 of the water level measuring water tank (2);

controlling the liquid level of the water level measuring water tank (2) to increase, detecting the distance between the lower surface of the calibration float (4) and the bottom of the water level measuring water tank (2) when the liquid level switch (3) operates, obtaining the liquid level height h2, and calculating the operating liquid difference delta h1 of the liquid level switch (3) to be h2-h 1;

the liquid level of the water level measuring water tank (2) is controlled to be lowered, the distance between the lower surface of the calibration float (4) and the bottom of the water level measuring water tank (2) when the liquid level switch (3) is recovered is detected, the liquid level height h3 is obtained, and the recovery liquid difference delta h2 of the liquid level switch (3) is calculated to be h3-h 1.

According to the embodiment of the invention, the step of obtaining the initial liquid level height h1 of the water level measuring tank (2) specifically comprises the following steps:

controlling the liquid level of the water level measuring tank (2) to be lower than the lower end surface of the liquid level switch (3), measuring the distance between the lower surface of the floater (32) and the bottom of the water level measuring tank (2) by using the first sensor (9), then replacing the positions of the first sensor (9) and the second sensor (10) with each other, measuring the distance between the lower surface of the floater (32) and the bottom of the water level measuring tank (2) by using the second sensor (10),

and (4) carrying out calibration according to the distance values measured twice, and obtaining the initial height h1 of the liquid level after calibration.

Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects: can detect liquid level switch action liquid difference and recovery liquid difference, guarantee the uniformity of liquid level switch internal contact action, and then guarantee the reliability of water pump drainage action when every air conditioner water is full, avoid causing the drainage untimely, rivers outside causes environmental pollution or leads to the water pump can idle run for a period of time, can produce the noise on the one hand of this kind of condition, and on the other hand also causes the energy extravagant.

Drawings

The scope of the present disclosure may be better understood by reading the following detailed description of exemplary embodiments in conjunction with the accompanying drawings. Wherein the included drawings are:

FIG. 1 shows an isometric view of an automatic level switch detection device;

FIG. 2 shows a front view of the automatic level switch detection device;

FIG. 3 is a first block diagram showing the schematic structure of the automatic detection device of the liquid level switch;

FIG. 4 is a block diagram showing a schematic structure of an automatic detection device for a liquid level switch;

FIG. 5 is a block diagram showing the schematic structure of the automatic detection device for the liquid level switch;

FIG. 6 is a flow chart illustrating the steps of a method for automatic detection of a level switch;

wherein: 1-a water storage tank; 2-measuring a water level tank; 3-a liquid level switch; 31-a rod body; 32-a float; 4-calibrating the buoy; 5, draining the pump; 6-water supply pump; 7-a drainage one-way valve; 8-water supply one-way valve; 9-a first sensor; 10-a second sensor; 11-rotating table.

In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the following will describe in detail an implementation method of the present invention with reference to the accompanying drawings and embodiments, so that how to apply technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented.

The following description is given with the directional terms as they are used in the drawings and is not intended to limit the specific embodiments of the support assembly, the assembly tool and the assembly method of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as either a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

[ embodiment 1 ]

Embodiment 1 of the present invention will be described in detail with reference to fig. 1 to 5.

The embodiment provides a level switch automatic checkout device, including survey level water tank 2 and controller (not shown in the figure), survey and be provided with level switch 3 in the level water tank 2, be provided with on the liquid level of 2 inside one sides of level water tank and mark cursory 4, survey level water tank 2 and correspond level switch 3 and measure and mark cursory 4's position below and be provided with distance sensor. The level switch 3 includes a vertically extending rod 31 and a float 32 provided on the rod 31. The floater 32 moves up and down along the rod body 31 along with the change of the liquid level height of the water level measuring water tank 2.

The controller controls the liquid level height change of the water level measuring water tank 2, and the distance sensor is utilized to collect the positions of the floater 32 and the calibration floater 4 to obtain the liquid level height change.

And the controller calculates the action liquid difference and the recovery liquid difference of the liquid level switch 3 based on the liquid level height variation, and judges whether the liquid level switch 3 is qualified or not according to whether the action liquid difference and the recovery liquid difference are in the range of the action liquid difference threshold and the recovery liquid difference threshold simultaneously or not.

As a preferred embodiment, a drain pipe and a drain pump 5 arranged on the drain pipe are arranged between the water storage tank 1 and the water level measuring tank 2; a water supply pipe and a water supply pump 6 arranged on the water supply pipe are also arranged between the water storage tank 1 and the water level measuring tank 2. The controller controls the drainage pump 5 and the water supply pump 6 to work, so that the liquid level height of the water level measuring water tank 2 is changed.

According to the embodiment of the invention, the action liquid difference and the recovery liquid difference of the liquid level switch are detected, so that the action consistency of the contacts in the liquid level switch is ensured, the reliability of the drainage action of the water pump when each air conditioner is full of water is further ensured, and the phenomenon that water flows to the outside due to untimely drainage, so that environmental pollution is caused or the water pump idles is avoided.

As a preferred embodiment, the water level measuring water tank 2 is divided into a water pipe room, a liquid level switch room and a calibration float room in sequence, the bottoms of the water pipe room, the liquid level switch room and the calibration float room are communicated, a water supply pipe and a water discharge pipe are arranged among the water pipes, and a liquid level switch 3 is arranged among the liquid level switches; the calibration float room is used for placing the calibration float 4. The structure is mainly used for preventing the influence on the accuracy of measuring the liquid level switch and calibrating the height of the liquid level of the float due to water waves when water is supplied or drained. As another preferred embodiment, the water level measuring tank 2 can also be divided into two spaces, one is used for placing a water supply pipe and a water discharge pipe, and the other is used for placing a liquid level switch 3 and a calibration float 4. The structure can also ensure the accuracy of measuring the liquid level switch and calibrating the liquid level height of the buoy, and only needs to ensure that the liquid level switch and the calibrating buoy do not interfere.

As a preferred embodiment, a drain check valve 7 is arranged on a drain pipe between the water level measuring tank 2 and the drain pump 5; a water supply one-way valve 8 is arranged on a water supply pipe between the water storage tank 1 and the water supply pump 6. The drain check valve 7 and the water supply check valve 8 can be manually controlled or controlled by a controller.

As a preferred embodiment, the calibration float 4 is an opaque surface float. The distance sensor can measure the liquid level of the calibration float 4 through reflection. When in use, the calibration float 4 is in the maximum extension state and keeps floating on one side of the inside of the water level measuring water tank 2 horizontally.

As a preferred embodiment, when the distance sensor is disposed on the inner sidewall of the bottom of the water level measuring tank 2, a waterproof distance sensor is required.

As another preferred embodiment, the distance sensor is located on the outer sidewall of the bottom of the level gauging tank 2, but in this case, it is necessary that the level gauging tank 2 is a transparent tank.

As a preferred embodiment, the water level measuring tank 2 is a transparent water tank, the distance sensors comprise a first sensor 9 and a second sensor 10, and are respectively arranged on two sides of a rotating platform 11 below the water level measuring tank 2, and the first sensor 9 and the second sensor 10 are respectively arranged right below the liquid level switch 3 and the calibration float 4.

In the initial state, the liquid level of the water level measuring tank 2 is lower than the lower end surface of the liquid level switch 3, the floater 32 is located at the lower end of the rod body 31, the first sensor 9 and the second sensor 10 are respectively arranged right below the liquid level switch 3 and the calibration float 4, and the controller controls the distance sensor to detect the position of the lower surface of the floater 32 to obtain the initial liquid level height of the water level measuring tank 2.

Preferably, the rotary table 11 is controlled to bring the first sensor 9 and the second sensor 10 to exchange positions, so as to calibrate the position of the float 32. The specific calibration method comprises the steps of enabling the first sensor 9 and the second sensor 10 to be replaced by starting a motor of the rotating platform 11, enabling the first sensor 9 to be located right below the calibration float 4, enabling the second sensor 10 to be located right below the liquid level switch 3, detecting the position of the lower surface of the float 32 again by using the second sensor 10, and obtaining the initial height of the liquid level after calibration. After calibration, the motor of the rotary table 11 is started again to return the first sensor 9 and the second sensor 10 to the initial positions.

As a preferred embodiment, the level switch 3 is a normally closed float level switch, although the invention can be used to detect other level switches.

As a preferred embodiment, the first sensor 9 and the second sensor 10 may be laser displacement sensors.

[ embodiment 2 ]

The embodiment provides an automatic detection method of a liquid level switch, which comprises the following steps:

controlling the liquid level height change of the water level measuring water tank 2, acquiring the positions of the floater 32 and the calibration floater 4 by using the distance sensor to obtain the liquid level height change amount, and calculating the action liquid difference and the recovery liquid difference of the liquid level switch 3 based on the liquid level height change amount;

and judging whether the liquid level switch 3 is qualified or not according to whether the action liquid difference and the recovery liquid difference are simultaneously within the range of the action liquid difference threshold and the recovery liquid difference threshold.

As a preferred embodiment, the step of controlling the liquid level height change of the water level measuring tank 2, acquiring the positions of the float 32 and the calibration float 4 by using the distance sensor to obtain the liquid level height change amount, and calculating the action liquid difference and the recovery liquid difference of the liquid level switch 3 based on the liquid level height change amount comprises the following steps:

controlling the liquid level of the water level measuring water tank 2 to be lower than the lower end surface of the liquid level switch 3, and detecting the position of the lower surface of the floater 32 to obtain the initial height h1 of the liquid level of the water level measuring water tank 2;

controlling the liquid level of the water level measuring water tank 2 to increase, detecting the position of the measuring calibration float 4 when the liquid level switch 3 operates, obtaining the liquid level height h2, and calculating the operating liquid difference delta h1 to h2-h 1;

and controlling the liquid level of the water level measuring water tank 2 to be reduced, detecting the position of the measuring calibration float 4 when the liquid level switch 3 is recovered, obtaining the liquid level height h3, and calculating the recovery liquid difference delta h2 to be h3-h 1.

The method for automatically detecting the liquid level switch will be described in detail with reference to fig. 3 to 6.

As shown in fig. 3 to 5, a drain check valve 7 is provided on the drain pipe between the water level measuring tank 2 and the drain pump 5; a water supply one-way valve 8 is arranged on a water supply pipe between the water storage tank 1 and the water supply pump 6.

In the initial state, the liquid level of the water level measuring tank 2 is controlled to be lower than the lower end surface of the liquid level switch 3, the floater 32 is positioned at the lower end of the rod body 31, and the initial height h1 of the liquid level of the water level measuring tank 2 is detected; the initial height h1 of the liquid level of the water level measuring tank 2 can be set according to different models without mandatory requirements.

Starting the water supply one-way valve 8 and the water supply pump 6, supplying water to the water level measuring water tank 2 from the water storage tank 1, increasing the liquid level of the water level measuring water tank 2, detecting the liquid level height h2 when the liquid level switch 3 operates, calculating the operating liquid difference delta h1 to be h2-h1, and stopping the water supply of the water supply one-way valve 8 and the water supply pump 6;

starting a drainage check valve 7 and a drainage pump 5, draining water from a water level measuring water tank 2 to a water storage tank 1, reducing the liquid level of the water level measuring water tank 2, detecting the liquid level height h3 when a liquid level switch 3 recovers, calculating a recovery liquid difference delta h2 which is h3-h1, and stopping drainage of the drainage check valve 7 and the drainage pump 5;

whether the working fluid difference Deltah 1 and the recovery fluid difference Deltah 2 satisfy a preset working fluid difference threshold and a recovery fluid difference threshold at the same time is judged.

The liquid level switch can be judged to be in accordance with the requirements only when the two conditions are met, and the preset action liquid difference threshold value and the preset recovery liquid difference threshold value can be set in the controller according to different machine types. The action fluid difference threshold and the recovery fluid difference threshold may be different range values. And when the action liquid difference delta h1 and the recovery liquid difference delta h2 do not simultaneously meet the preset action liquid difference threshold and the preset recovery liquid difference threshold, alarming or flickering light to prompt that the liquid level switch product is unqualified.

When the liquid level switch 3 is a normally closed floating ball liquid level switch, the automatic detection method of the liquid level switch comprises the following steps:

detecting the initial height h1 of the liquid level of the water level measuring water tank 2;

starting the water supply check valve 8 and the water supply pump 6, supplying water to the water level measuring water tank 2 from the water storage tank 1, detecting the instantaneous liquid level h2 when the liquid level switch 3 is switched from a normally closed state to an off state, calculating an action liquid difference delta h1 to h2-h1, and stopping the water supply of the water supply check valve 8 and the water supply pump 6;

starting a drainage check valve 7 and a drainage pump 5, draining water from a water level measuring water tank 2 to a water storage tank 1, detecting an instant liquid level h3 when a liquid level switch 3 is in an off state and returns to a normally closed state, calculating a return liquid difference delta h2 which is h3-h1, and stopping drainage of the drainage check valve 7 and the drainage pump 5;

whether the working fluid difference Deltah 1 and the recovery fluid difference Deltah 2 satisfy a preset working fluid difference threshold and a recovery fluid difference threshold at the same time is judged.

As a preferred embodiment, before the step of obtaining the initial height h1 of the liquid level of the water level tank 2, the method further comprises the following steps: and controlling the liquid level of the water level measuring water tank 2 to be lower than the lower end surface of the liquid level switch 3, and calibrating the position of the floater 32 by using the distance sensor to obtain the initial liquid level height h1 after calibration.

Specifically, in the initial state, the first sensor 9 and the second sensor 10 are respectively arranged right below the liquid level switch 3 and the calibration float 4, and the liquid level height of the calibration float 4 and the liquid level height of the liquid level switch 3 are measured. During calibration, the motor of the rotary table 11 is started to change the positions of the first sensor 9 and the second sensor 10, the first sensor 9 is positioned directly below the calibration float 4, the second sensor 10 is positioned directly below the level switch 3, and the position of the lower surface of the float 32 is detected again by the second sensor 10, thereby obtaining the initial level of the liquid level after calibration. After calibration, the first sensor 9 and the second sensor 10 are reset by the motor rotating the turntable 11.

The invention can be used as a detection device of the liquid level switch before delivery or installation, and can also be embedded into an air conditioner, and the control program and the method thereof are embedded into the control program of the air conditioner. If the automatic detection device is matched with an air conditioner for use, the automatic detection device for the liquid level switch can be installed in a centralized disc of the air conditioner, and can detect whether the liquid level switch keeps sensitive or not at regular time, so that the consistency of the action of contacts in the liquid level switch is ensured, the reliability of the drainage action of the water pump when each air conditioner is full of water is further ensured, and untimely drainage and environmental pollution are prevented.

Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.