阅读说明：本技术 磁性开关以及液位测量装置 (Magnetic switch and liquid level measuring device ) 是由 和明 林敏� 黄家峰 聂碧涛 李卫华 于 2019-10-30 设计创作，主要内容包括：本发明涉及一种磁性开关及液位测量装置,磁性开关包括支撑体、第一软磁片、第二软磁片以及固定磁体。支撑体具有相对设置的第一安装端和第二安装端。第一软磁片设置于支撑体的第一安装端。第二软磁片设置于支撑体的第二安装端,第一软磁片和第二软磁片的自由端沿支撑体的延伸方向重叠。固定磁体设置于支撑体,固定磁体靠近第二软磁片并与第二软磁片间隔设置,固定磁体的一个磁极朝向第二软磁片。上述磁性开关以及液位测量装置,使用固定磁体产生的磁场将第二软磁片磁化为固定极型,同时允许第一软磁片在移动磁体移动的过程中被磁化为不同极型,进而实现两个软磁片的闭合和断开。在移动磁体远离磁性开关时仍然允许信号电路持续输出触发信号。(The invention relates to a magnetic switch and a liquid level measuring device. The support body is provided with a first mounting end and a second mounting end which are oppositely arranged. The first soft magnetic sheet is arranged at the first mounting end of the support body. The second soft magnetic sheet is arranged at the second mounting end of the support body, and the free ends of the first soft magnetic sheet and the second soft magnetic sheet are overlapped along the extending direction of the support body. The fixed magnet is arranged on the support body, the fixed magnet is close to the second soft magnetic sheet and arranged at intervals with the second soft magnetic sheet, and one magnetic pole of the fixed magnet faces the second soft magnetic sheet. According to the magnetic switch and the liquid level measuring device, the second soft magnetic sheet is magnetized into the fixed pole type by the magnetic field generated by the fixed magnet, and the first soft magnetic sheet is allowed to be magnetized into different pole types in the moving process of the moving magnet, so that the two soft magnetic sheets are switched on and switched off. The signal circuit is still allowed to continue outputting the trigger signal when the moving magnet is away from the magnetic switch.)

1. A magnetic switch, comprising:

a support body (110) having a first mounting end and a second mounting end, the first mounting end and the second mounting end being oppositely disposed along an extension direction of the support body (110);

a first soft magnetic sheet (120) arranged at the first mounting end of the support body (110), the first soft magnetic sheet (120) having a first free end remote from the first mounting end;

a second soft magnetic sheet (130) disposed at the second mounting end of the support body (110), the second soft magnetic sheet (130) having a second free end away from the second mounting end, the second free end and the first free end overlapping along an extension direction of the support body (110);

the fixed magnet (140) is arranged on the support body (110), the fixed magnet (140) is close to the second soft magnetic sheet (130) along the extension direction of the support body (110), the fixed magnet (140) and the second soft magnetic sheet (130) are arranged at intervals, and one magnetic pole of the fixed magnet (140) faces the second soft magnetic sheet (130);

the second free end and the first free end are arranged at intervals in an initial state, when a moving magnet (210) outside the magnetic switch (100) sequentially approaches the second soft magnetic sheet (130) and the first soft magnetic sheet (120) along the extension direction of the support body (110), the polarity of the magnetized first soft magnetic sheet (120) is opposite to that of the second soft magnetic sheet (130), and the second free end is in lap joint with the first free end.

2. The magnetic switch of claim 1, wherein the material of the first soft-magnetic sheet (120) and the second soft-magnetic sheet (130) comprises iron-cobalt-nickel alloy.

3. The magnetic switch according to claim 1, wherein the support body (110) comprises a glass tube having two closed ends, the first soft magnetic sheet (120) and the second soft magnetic sheet (130) are respectively disposed at the two closed ends of the glass tube, and the fixed magnet (140) is disposed at an outer wall of the glass tube.

4. The magnetic switch of claim 3, wherein the glass tube is evacuated or filled with an inert gas.

5. The magnetic switch of claim 1, wherein the magnetic switch (100) further comprises a housing (150) of a non-magnetically resistive material, the support (110), the first soft magnetic sheet (120), the second soft magnetic sheet (130), and the fixed magnet (140) being disposed within the housing (150), respectively.

6. The magnetic switch of claim 5, wherein the material of the housing (150) comprises ceramic or plastic.

7. The magnetic switch according to any of claims 1 to 6, wherein the support body (110), the first soft magnetic sheet (120) and the second soft magnetic sheet (130) form a reed switch, one pole of the fixed magnet (140) is arranged on an outer tube wall of the reed switch, the fixed magnet (140) is close to the second soft magnetic sheet (130) in an extension direction of the reed switch, and a magnetic force of the fixed magnet (140) is larger than a minimum ampere-turn value of the reed switch.

8. A liquid level measuring device, comprising a communicating vessel (200), a signal circuit (300) and the magnetic switch (100) of any one of claims 1 to 7, wherein the magnetic switch (100) is connected in series with the signal circuit (300), and two terminals of the signal circuit (300) are respectively connected with the first soft magnetic sheet (120) and the second soft magnetic sheet (130); the magnetic switch (100) is arranged outside the communicating vessel (200) and keeps a set distance with the outer wall of the communicating vessel (200), the magnetic switch (100) is arranged at a set water level height of the communicating vessel (200), the extension direction of the magnetic switch (100) is parallel to the water level lifting direction in the communicating vessel (200), and the first soft magnetic sheet (120) is positioned at the upper part of the second soft magnetic sheet (130); the container of water level that awaits measuring can be linked together in linker (200), removal magnet (210) have in linker (200), removal magnet (210) can go up and down along with the water level that awaits measuring, two magnetic poles of removal magnet (210) set up from top to bottom, removal magnet (210) magnetic pole up with fixed magnet (140) orientation the magnetic pole of second soft magnetic sheet (130) has the same polarity.

9. The liquid level measuring device of claim 8, wherein the communicating vessel (200) further comprises a float (220), the float (220) being arranged within the communicating vessel (200), the float (220) being capable of rising and falling with the water level to be measured, the moving magnet (210) being arranged at the float (220).

10. The fluid level measuring device of claim 9, wherein the float (220) comprises a stainless steel hollow float ball, and the moving magnet (210) is embedded in the stainless steel hollow float ball.

11. The liquid level measuring device according to any one of claims 8-10, wherein the liquid level measuring device (10) further comprises a switch mounting (230), the switch mounting (230) being arranged on an outer wall of the communicator (200), the magnetic switch (100) being arranged on the mounting.

Technical Field

The invention relates to the technical field of liquid level measurement, in particular to a magnetic switch and a liquid level measuring device.

Background

The steam cleaner boiler is in a high-temperature and high-pressure state in the internal working process, a communicating vessel can be added for measuring the internal liquid level, and the external reed switch is triggered to carry out non-contact measurement by embedding a magnetic element into an internal floating ball generally in the industry at present. However, this type of liquid level measurement only ensures that a magnetic element such as a magnet is activated (opened or closed) when the magnetic element is in close proximity to the reed switch. When the magnetic element is far away from the reed pipe, the original state can be restored. This type of level measurement cannot maintain the activated state of the reed switch after the magnetic element is removed. The liquid level drives the magnet to exceed the measuring switch, and then the trigger signal cannot be continuously output.

Disclosure of Invention

In view of the above, it is necessary to provide a magnetic switch and a liquid level measuring apparatus capable of continuously outputting a trigger signal, in order to solve the problem that the trigger signal cannot be continuously output in the conventional liquid level measuring method.

A magnetic switch, comprising:

the supporting body is provided with a first mounting end and a second mounting end, and the first mounting end and the second mounting end are oppositely arranged along the extending direction of the supporting body;

the first soft magnetic sheet is arranged at the first mounting end of the support body and is provided with a first free end far away from the first mounting end;

the second soft magnetic sheet is arranged at the second mounting end of the support body, the second soft magnetic sheet is provided with a second free end far away from the second mounting end, and the second free end and the first free end are overlapped along the extension direction of the support body;

the fixed magnet is arranged on the support body, the fixed magnet is close to the second soft magnetic sheet along the extension direction of the support body, the fixed magnet and the second soft magnetic sheet are arranged at intervals, and one magnetic pole of the fixed magnet faces the second soft magnetic sheet;

the second free end and the first free end are arranged at intervals in an initial state, when a moving magnet outside the magnetic switch sequentially approaches the second soft magnetic sheet and the first soft magnetic sheet along the extension direction of the support body, the polarity of the magnetized first soft magnetic sheet (120) is opposite to that of the second soft magnetic sheet (130), and the second free end is in lap joint with the first free end.

In one embodiment, the material of the first soft magnetic sheet and the second soft magnetic sheet comprises iron-cobalt-nickel alloy.

In one embodiment, the support body comprises a glass tube with two closed ends, the first soft magnetic sheet and the second soft magnetic sheet are respectively arranged at the two closed ends of the glass tube, and the fixed magnet is arranged on the outer wall of the glass tube.

In one embodiment, the glass tube is evacuated or filled with an inert gas.

In one embodiment, the magnetic switch further includes a housing made of a non-magnetic-blocking material, and the support, the first soft magnetic sheet, the second soft magnetic sheet, and the fixed magnet are respectively disposed in the housing.

In one embodiment, the material of the housing comprises ceramic or plastic.

In one embodiment, the support body, the first soft magnetic sheet and the second soft magnetic sheet form a reed pipe, one magnetic pole of the fixed magnet is arranged on the outer pipe wall of the reed pipe, the fixed magnet is close to the second soft magnetic sheet in the extension direction of the reed pipe, and the magnetic force of the fixed magnet is larger than the minimum ampere-turn value of the reed pipe.

A liquid level measuring device comprises a communicating vessel, a signal circuit and a magnetic switch in any one of the schemes, wherein the magnetic switch is connected in series with the signal circuit, and two wiring terminals of the signal circuit are respectively connected with a first soft magnetic sheet and a second soft magnetic sheet; the magnetic switch is arranged outside the communicating vessel and keeps a set distance with the outer wall of the communicating vessel, the magnetic switch is arranged at a set water level height of the communicating vessel, the extension direction of the magnetic switch is parallel to the water level lifting direction in the communicating vessel, and the first soft magnetic sheet is positioned at the upper part of the second soft magnetic sheet; the communicating vessel can communicate the container of the water level to be measured, a movable magnet is arranged in the communicating vessel and can lift along with the water level to be measured, two magnetic poles of the movable magnet are arranged up and down, and the upward magnetic pole of the movable magnet and the magnetic pole of the fixed magnet face the second soft magnetic sheet have the same polarity.

In one embodiment, the communicating vessel further comprises a floater, the floater is arranged in the communicating vessel and can ascend and descend along with the water level to be measured, and the movable magnet is arranged on the floater.

In one embodiment, the float comprises a stainless steel hollow floating ball, and the moving magnet is embedded in the stainless steel hollow floating ball.

In one embodiment, the liquid level measuring device further comprises a switch mounting seat, the switch mounting seat is arranged on the outer wall of the communicating vessel, and the magnetic switch is arranged on the mounting seat.

According to the magnetic switch and the liquid level measuring device, the second soft magnetic sheet is magnetized into the fixed pole type by the magnetic field generated by the fixed magnet, and the first soft magnetic sheet is allowed to be magnetized into different pole types in the moving process of the moving magnet, so that the two soft magnetic sheets are switched on and switched off. When the moving magnet is far away from the magnetic switch, the fixed magnet magnetizes the second soft magnetic sheet, so that the second soft magnetic sheet and the first soft magnetic sheet can be kept closed, and the signal circuit is allowed to continuously output the trigger signal.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a magnetic switch mounted on a communicating vessel according to an embodiment of the present invention;

FIG. 2 is a schematic diagram illustrating an initial state of a magnetic switch and a communicating vessel according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of a liquid level measuring device according to an embodiment of the present invention when a water level rises;

FIG. 4 is a schematic diagram illustrating the state of the magnetic switch when the moving magnet is raised to the height of the first soft magnetic sheet according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of a liquid level measuring device for measuring a liquid level from a water level to a high level according to an embodiment of the present invention;

FIG. 6 is a schematic diagram illustrating the magnetic switching state of the moving magnet when it rises above the first soft-magnetic plate according to an embodiment of the present invention;

FIG. 7 is a schematic structural view of a liquid level measuring device according to an embodiment of the present invention when the water level is lowered;

fig. 8 is a schematic diagram illustrating the principle that the magnetic switch is in an off state when the water level drops according to an embodiment of the present invention.

10-a liquid level measuring device; 100-magnetic switch, 110-support, 120-first soft magnetic sheet, 130-second soft magnetic sheet, 140-fixed magnet, 150-housing; 200-communicating vessel, 210-moving magnet, 220-floater, 230-switch mounting seat; 300-a signal circuit; 50-boiler.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

In the description of the present invention, it is to be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner and are not to be construed as limiting the present invention.

As shown in fig. 1 and 2, an embodiment of the invention provides a magnetic switch 100, which includes a supporting body 110, a first soft magnetic sheet 120, a second soft magnetic sheet 130, and a fixed magnet 140. The supporting body 110 has a first mounting end and a second mounting end, which are oppositely disposed along the extending direction of the supporting body 110. The first soft magnetic sheet 120 is disposed at a first mounting end of the support body 110, and the first soft magnetic sheet 120 has a first free end far away from the first mounting end. The second soft magnetic sheet 130 is disposed at a second mounting end of the supporting body 110, the second soft magnetic sheet 130 has a second free end far away from the second mounting end, and the second free end and the first free end are overlapped along an extending direction of the supporting body 110. The fixed magnet 140 is disposed at the support body 110, the fixed magnet 140 is adjacent to the second soft magnetic sheet 130 along the extending direction of the support body 110, the fixed magnet 140 is disposed at an interval from the second soft magnetic sheet 130, one magnetic pole of the fixed magnet 140 faces the second soft magnetic sheet 130, and the second soft magnetic sheet 130 is magnetized to the same polarity as the magnetic pole facing the second soft magnetic sheet 130. The second free end and the first free end are spaced in the initial state, when the moving magnet 210 outside the magnetic switch 100 is sequentially close to the second soft magnetic sheet 130 and the first soft magnetic sheet 120 along the extending direction of the support 110, the polarity of the magnetized first soft magnetic sheet 120 is opposite to that of the second soft magnetic sheet 130, and the second free end and the first free end are overlapped to realize the closing.

The magnetic switch 100 described above magnetizes the second soft-magnetic sheet 130 to a fixed pole type using the magnetic field generated by the fixed magnet 140, while allowing the first soft-magnetic sheet 120 to be magnetized to a different pole type during the movement of the moving magnet 210, thereby achieving the closing and opening of the two soft-magnetic sheets. The stationary magnet 140 is able to keep the second soft-magnetic plate 130 and the first soft-magnetic plate 120 closed by magnetizing the second soft-magnetic plate 130 when the magnet 210 is moved away from the magnetic switch 100, allowing the signal circuit 300 to continue to output the trigger signal, as shown in fig. 3-6. The number of magnetic switches 100 used can be reduced where precise measurements are not required, thereby reducing the number of measurement ports used. The magnetic switch 100 is convenient to use in a use scene to be maintained after being triggered, and can be realized without adding other components.

It will be appreciated that the first and second soft-magnetic pieces 120 and 130 of soft-magnetic material can be rapidly magnetized by the magnet and also rapidly demagnetized when the magnetic field of the magnet disappears, and thus the first and second soft-magnetic pieces 120 and 130 can be closed and opened. In an embodiment of the present invention, the first soft magnetic sheet 120 and the second soft magnetic sheet 130 are made of an iron-cobalt-nickel alloy, which can be magnetized quickly and demagnetized quickly. In other embodiments of the present invention, the first soft magnetic sheet 120 and the second soft magnetic sheet 130 may also be other types of soft magnetic materials, such as silicon steel sheet, permalloy, amorphous and nanocrystalline alloys, and the like.

It can be easily understood that the supporting body 110 is used to provide a support for the installation of the first soft magnetic sheet 120, the second soft magnetic sheet 130 and the fixed magnet 140, and any form of supporting structure is the supporting body 110 claimed in the present invention, such as a bracket, a supporting plate or a mounting seat, and the material of the supporting body is not limited, provided that the supporting body can achieve this function. In an embodiment of the present invention, as shown in fig. 2, the support body 110 includes a glass tube having both closed ends, the first soft magnetic sheet 120 and the second soft magnetic sheet 130 are respectively disposed at both closed ends of the glass tube, and the fixed magnet 140 is disposed at an outer wall of the glass tube. The glass tube not only satisfies the requirement of supporting or mounting the first soft-magnetic sheet 120, the second soft-magnetic sheet 130, and the fixed magnet 140, but also allows an observer to directly observe the closing or opening of the first soft-magnetic sheet 120 and the second soft-magnetic sheet 130. Further, the glass tube is evacuated or filled with inert gas, so that the first soft magnetic sheet 120 and the second soft magnetic sheet 130 can be effectively protected, the first soft magnetic sheet 120 and the second soft magnetic sheet 130 are isolated from the external environment, the first soft magnetic sheet 120 and the second soft magnetic sheet 130 are prevented from being damaged mechanically, and the first soft magnetic sheet 120 and the second soft magnetic sheet 130 can be prevented from being oxidized in a power-on state.

Optionally, the magnetic switch 100 in the above embodiments may be designed according to actual requirements and operating conditions, or may be obtained by creative combinations of some electronic components. In an embodiment of the present invention, as shown in fig. 2, 4, 6 and 8, the support body 110, the first soft magnetic sheet 120 and the second soft magnetic sheet 130 form a reed switch, one magnetic pole of the fixed magnet 140 is disposed on an outer tube wall of the reed switch, the fixed magnet 140 is close to the second soft magnetic sheet 130 in an extending direction of the reed switch, and a magnetic force of the fixed magnet 140 is greater than a minimum ampere-turn value of the reed switch. The magnetic switch 100 formed by creatively adding the fixed magnet 140 on the basis of the reed switch can effectively realize the continuous closing of the reed switch, thereby allowing the signal circuit 300 connected in series with the magnetic switch 100 to continuously output a closing signal carrying corresponding information.

The support body 110, the first soft-magnetic sheet 120, the second soft-magnetic sheet 130 and the fixed magnet 140 in the magnetic switch 100 as a whole can provide corresponding signals with their continuous closing or opening. In an embodiment of the present invention, as shown in fig. 2, the magnetic switch 100 further includes a housing 150 made of a non-magnetic-blocking material, and the supporting body 110, the first soft magnetic sheet 120, the second soft magnetic sheet 130 and the fixed magnet 140 are respectively disposed in the housing 150. The housing 150 can effectively protect or enclose the magnetic switch 100, so that the magnetic switch 100 provided by the present embodiment can be adapted to more working conditions, and the use requirement of an operator using the magnetic switch 100 provided by the present embodiment can be reduced. Further, the material of the casing 150 includes ceramic or plastic, and the casing 150 made of ceramic or plastic can take care of the protection and the usability of the magnetic switch 100.

As shown in fig. 1, 3, 5 and 7, the present invention further provides a liquid level measuring device 10, which includes a communicating vessel 200, a signal circuit 300 and the magnetic switch 100 according to any one of the above embodiments, wherein the magnetic switch 100 is connected in series to the signal circuit 300, and two terminals of the signal circuit 300 are respectively connected to the first soft magnetic sheet 120 and the second soft magnetic sheet 130. The magnetic switch 100 is disposed outside the communicating vessel 200 and keeps a set distance from the outer wall of the communicating vessel 200, the magnetic switch 100 is disposed at a set water level height of the communicating vessel 200, the extending direction of the magnetic switch 100 is parallel to the water level lifting direction in the communicating vessel 200, and the first soft magnetic sheet 120 is located on the upper portion of the second soft magnetic sheet 130. The communicating vessel 200 can communicate with a container of a water level to be measured, the communicating vessel 200 is internally provided with a movable magnet 210, the movable magnet 210 can lift along with the water level to be measured, two magnetic poles of the movable magnet 210 are arranged up and down, and the upward magnetic pole of the movable magnet 210 and the magnetic pole of the fixed magnet 140 facing the second soft magnetic sheet 130 have the same polarity. The second free end and the first free end are spaced at an initial state, and when the moving magnet 210 rises to a height exceeding the first soft magnetic sheet 120 with the water level in the communicator 200, the second free end and the first free end are overlapped, and a high water level signal is generated in the signal circuit 300. When the moving magnet 210 drops to a level lower than the first soft-magnetic sheet 120 with the water level in the communicator 200, the second free end and the first free end are separated, and the high water level signal generated in the signal circuit 300 disappears.

The above-described level measuring device 10 magnetizes the second soft-magnetic sheet 130 to a fixed pole type using the magnetic field generated by the fixed magnet 140, while allowing the first soft-magnetic sheet 120 to be magnetized to a different pole type during the movement of the moving magnet 210, thereby achieving the closing and opening of the two soft-magnetic sheets. The stationary magnet 140 is able to keep the second soft-magnetic plate 130 and the first soft-magnetic plate 120 closed by magnetizing the second soft-magnetic plate 130 when moving the magnet 210 away from the magnetic switch 100, allowing the signal circuit 300 to continue to output the trigger signal. It should be understood that the liquid level measuring device 10 provided by the present invention can be communicated with various containers with liquid level measuring requirements, thereby measuring the liquid level of the liquid therein, and the measuring types are not limited to water level, oil level and the like.

The magnetic pole of the moving magnet 210 facing the liquid level rising direction is the same as the fixed magnet 140 facing the second soft magnetic sheet 130, and may be either N-pole or S-pole. It will be appreciated that the fixed and moving poles in each of the above embodiments may be permanent magnets or solenoids that generate a magnetic field when energized. As an implementation manner, as shown in fig. 1 and 2, the permanent magnet is selected to independently generate the magnetic field without an additional matching structure. In an embodiment of the present invention, the communicating vessel 200 further includes a float 220, the float 220 is disposed in the communicating vessel 200, the float 220 can ascend and descend with the water level to be measured, and the movable magnet 210 is disposed on the float 220. The float 220 is more sensitive to changes in the liquid level within the communicator 200. Alternatively, the float 220 may be a rubber float 220, a plastic float 220, or other type of float 220 capable of meeting the particular needs. In one embodiment of the present invention, the float 220 comprises a stainless steel hollow ball, and the moving magnet 210 is embedded in the stainless steel hollow ball. The stainless steel float 220 is capable of measuring the level of high temperature liquid, such as the liquid level in the steam cleaner boiler 50, and the steel ball of stainless steel material does not react with the high temperature water to damage the float 220. The moving magnet 210 embedded in the stainless steel hollow float 220 can be lifted and lowered together with the float 220 as the liquid level is lifted and lowered. Further, the liquid level measuring device 10 further includes a switch mounting seat 230, the switch mounting seat 230 is disposed on an outer wall of the communicating vessel 200, and the magnetic switch 100 is disposed on the mounting seat. The switch mounting 230 enables a quick connection, standardized connection of the magnetic switch 100 with the communicator 200.

The following description will be made of the working principle and the working process of the magnetic switch 100 and the liquid level measuring device 10 according to the present invention, taking the magnetic switch 100 and the liquid level measuring device 10 as an example for measuring the water level in the boiler 50 of the steam cleaning machine. Fig. 1, 3, 5 and 7 are respectively a structural diagram of the liquid level measuring device 10 or a structural diagram of the assembly of the liquid level measuring device 10 and the steam cleaner boiler 50. Fig. 2, 4, 6 and 8 are schematic diagrams illustrating the operation of the combination of the magnetic switch 100 and the communicating vessel 200. It should be understood that the magnetic switch 100 and the fluid level measuring device 10 provided by the present invention are not limited to this case.

As shown in fig. 1 and 2, the liquid level measuring device 10 is composed of a magnetic switch 100, a communicating vessel 200 and a signal circuit 300. When the float 220 and the moving magnet 210 in the communicating vessel 200 are at the low position, the first soft-magnetic sheet 120 and the second soft-magnetic sheet 130 in the magnetic switch 100 are in the off state, and the signal circuit 300 is also in the off state due to the series connection of the magnetic switch 100. The second soft-magnetic piece 130 is also magnetized to the N-pole due to the N-pole of the nearby fixed magnet 140, and the second soft-magnetic piece 130 is not polarized. The moving magnet 210 has its north pole facing upward and its south pole facing downward.

As shown in fig. 3 and 4, when the water level in the steam washer boiler 50 rises, the water level in the communicator 200 also rises, thereby moving the float 220 and the moving magnet 210 upward. When the moving magnet 210 moves to the vicinity of the position of the first soft magnetic sheet 120, the south pole of the moving magnet 210 is close to the first soft magnetic sheet 120, the moving magnet 210 magnetizes the first soft magnetic sheet 120 to the south pole, and then the first soft magnetic sheet 120 and the second soft magnetic sheet 130 generate a force of mutual attraction to realize closing, and a closing signal generated in the signal circuit 300 can indicate that the water level in the steam cleaner boiler 50 reaches a set water level. As shown in fig. 5 and 6, since the magnetic force of the fixed magnet 140 is greater than the minimum ampere-turn value between the first soft magnetic sheet 120 and the second soft magnetic sheet 130, even if the float 220 drives the movable magnet 210 to continuously rise, the first soft magnetic sheet 120 and the second soft magnetic sheet 130 can be in a closed state under the action of the fixed magnet 140, and then a closing signal can be continuously generated in the signal circuit 300, so as to help an operator accurately judge whether the water level in the boiler 50 exceeds a set water level height.

As shown in fig. 7 and 8, when the water level in the steam cleaning boiler 50 is lowered, the moving magnet 210 is also lowered along with the water level, and when the moving magnet 210 moves to the vicinity of the first soft magnetic sheet 120 during the lowering process, the moving magnet 210 magnetizes the first soft magnetic sheet 120 to the N-pole, and the first soft magnetic sheet 120 in the N-pole state and the second soft magnetic sheet 130, which is also the N-pole, repel each other and are separated. And after the first soft magnetic sheet 120 is separated from the second soft magnetic sheet 130, the first soft magnetic sheet 120 is rapidly demagnetized, the first soft magnetic sheet 120 and the second soft magnetic sheet 130 maintain the off state, and thus the high water level signal in the signal circuit 300 disappears. So as to reciprocate. It should be understood that, in the present embodiment, the S-pole of the fixed magnet 140 may face the second soft magnetic sheet 130, and the S-pole of the movable magnet 210 is adjusted to face upward correspondingly, as above.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.