High-temperature-resistant liquid level switch

Abstract

The utility model discloses a high temperature resistant liquid level switch, which comprises a mounting plate, a sleeve, a guide rod, a floating ball, an annular magnet, a magnetic reed switch, a sheath, an air inlet pipe, an air pump and an air outlet pipe, the bottom end of the mounting plate is fixedly provided with the sleeve which is vertical to the mounting plate, the guide rod is sleeved in the sleeve, the bottom end of the guide rod extends to the lower part of the sleeve, and the floating ball is arranged at the bottom end of the guide rod. The floating ball is detachably connected with the guide rod, an annular magnet is fixed to the top end of the guide rod, a magnetic reed switch is fixed to the sleeve, a sheath is fixedly connected to the outer wall of the sleeve in a sleeving mode, an annular cooling cavity is defined between the inner wall of the sheath and the outer wall of the sleeve, an air inlet pipe and an air outlet pipe are fixed to the mounting plate, and the air inlet pipe is communicated to the position, close to the bottom end, of an inner cavity of the annular cavity. The air outlet pipe is communicated to the inner cavity of the annular cavity and is close to the top end; and an air pump is fixed on a pipeline of the air inlet pipe. The magnetic reed switch and the annular magnet are separated from the liquid, heat transfer is reduced, and the magnetic reed switch and the annular magnet are cooled through cold air and are prevented from being out of order in a high-temperature environment for a long time.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level switches, in particular to a high temperature resistant liquid level switch. Background Art

[0002] In the manufacturing process of oil temperature machine, the detection of oil level in the oil tank is a relatively important task. If the liquid level of the oil tank cannot be accurately detected, it is easy to cause the high-temperature thermal oil to overflow, or the machine to idle in the state of lack of oil, and even cause production accidents. Most of the float level switches in the industry are used to monitor the oil level in the oil tank. The reed switch of the traditional float level switch is placed inside the rod diameter that contacts the measured medium, and the magnet that cooperates with it is placed inside the float, and both need to be immersed in the medium. This kind of float level switch immerses the working parts of the switch (reed switch and magnet) in high-temperature thermal oil for a long time, which easily causes its magnetism to fail at high temperature, and the control signal is unstable, which causes the oil tank oil level to not alarm or keep alarming when it is too high or too low, and even causes other parts of the machine to burn out, causing great losses to customers. There is currently no reliable technical solution. Utility Model Content

[0003] The purpose of the present application is to provide a high temperature resistant liquid level switch to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a high-temperature resistant liquid level switch, comprising a mounting plate, a sleeve, a guide rod, a float, an annular magnet, a reed switch, a sleeve, an air inlet pipe, an air pump and an air outlet pipe, wherein a sleeve arranged vertically therewith is fixedly mounted on the bottom end of the mounting plate, a guide rod is sleeved and mounted inside the sleeve, the bottom end of the guide rod extends to the bottom of the sleeve, a float is mounted on the bottom end of the guide rod, the float and the guide rod are detachably connected, and an annular magnet is fixedly sleeved and mounted on the top end of the guide rod. Iron, the annular magnet is slidably connected to the inner wall of the sleeve, a reed switch is fixedly mounted on the sleeve, a sheath coaxial with the sleeve is fixedly mounted on the outer wall of the sleeve, an annular cooling cavity is enclosed between the inner wall of the sheath and the outer wall of the sleeve, an air inlet pipe and an air outlet pipe are fixedly mounted on the mounting plate, the air inlet pipe leads to the inner cavity of the annular cooling cavity near the bottom end, the air outlet pipe leads to the inner cavity of the annular cooling cavity near the top end, and an air pump is fixedly mounted on the air inlet pipe.

[0005] Preferably, the float and the guide rod are detachably connected by threads.

[0006] Preferably, a signal line is fixedly mounted on the mounting plate, and the signal line is connected to the reed switch.

[0007] Preferably, the mounting plate is threadedly connected with mounting bolts.

[0008] Preferably, the sleeve is provided with a plurality of evenly distributed air holes near the top end thereof.

[0009] Preferably, the reed switch is located inside the annular cooling cavity.

[0010] In summary, the technical effects and advantages of the utility model are:

[0011] In the utility model, the float contacts the liquid surface, and the float drives the annular magnet to slide in the sleeve through the buoyancy, thereby triggering the reed switch. The annular magnet and the reed switch do not contact the high-temperature liquid. The air pump sends cold air into the annular cooling cavity through the air inlet pipe. The cold air cools the reed switch and the annular magnet, thereby protecting them, so that they can operate efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 This is a schematic diagram of the structure of a high temperature resistant liquid level switch in an embodiment of the present application;

[0014] Figure 2 This is a schematic cross-sectional structure diagram of a high temperature resistant liquid level switch in an embodiment of the present application.

[0015] In the figure: 1. Mounting plate; 2. Sleeve; 3. Guide rod; 4. Float; 5. Ring magnet; 6. Reed switch; 7. Sheath; 8. Ring cooling chamber; 9. Inlet pipe; 10. Air pump; 11. Outlet pipe; 12. Signal line; 13. Mounting bolts. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] In the description of the present disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0018] It should also be noted that the standard parts used in this application document can be purchased from the market, and can be customized according to the description in the specification and drawings. Unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, and it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this disclosure can be understood according to the specific circumstances, and in the absence of clear limitations, machines, parts and equipment can all adopt conventional models in the prior art.

[0019] In this article, the term "comprising" is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "comprising..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0020] Example: Reference Figure 1-2The high temperature resistant liquid level switch shown in the figure comprises a mounting plate 1, a sleeve 2, a guide rod 3, a float 4, an annular magnet 5, a reed switch 6, a sleeve 7, an air inlet pipe 9, an air pump 10 and an air outlet pipe 11, wherein the bottom end of the mounting plate 1 is fixedly mounted with a sleeve 2 vertically arranged therewith, the sleeve 2 is sleeved with a guide rod 3, the bottom end of the guide rod 3 extends to the bottom of the sleeve 2, a float 4 is mounted at the bottom end of the guide rod 3, the float 4 and the guide rod 3 are detachably connected, an annular magnet 5 is fixedly mounted on the top end of the guide rod 3, the annular magnet 5 is slidably connected to the inner wall of the sleeve 2, a reed switch 6 is fixedly mounted on the sleeve 2, and a reed switch 6 is fixedly mounted on the outer wall of the sleeve 2 A coaxial sheath 7 is provided, an annular cooling chamber 8 is enclosed between the inner wall of the sheath 7 and the outer wall of the sleeve 2, an air inlet pipe 9 and an air outlet pipe 11 are fixedly mounted on the mounting plate 1, the air inlet pipe 9 leads to the inner cavity of the annular cooling chamber 8 near the bottom end, the air outlet pipe 11 leads to the inner cavity of the annular cooling chamber 8 near the top end, an air pump 10 is fixedly mounted on the pipeline of the air inlet pipe 9, a float is in contact with the liquid surface, the float drives the annular magnet to slide in the sleeve through the buoyancy, thereby triggering the reed switch, the annular magnet and the reed switch are not in contact with the high-temperature liquid, the air pump delivers cold air to the annular cooling chamber through the air inlet pipe, the cold air cools down the reed switch and the annular magnet, thereby protecting them, so that they can operate efficiently.

[0021] With the above structure, the float 4 and the guide rod 3 are detachably connected by threads, so that the float can be removed and replaced after being damaged.

[0022] With the above structure: the signal line 12 is fixedly mounted on the mounting plate 1, and the signal line 12 is connected to the reed switch 6 for signal transmission.

[0023] With the above structure, the mounting plate 1 is threadedly connected with mounting bolts 13 to facilitate fixing the mounting plate 1 .

[0024] With the above structure, the sleeve 2 is provided with a plurality of evenly distributed air holes near the top thereof to facilitate the up and down sliding of the annular magnet.

[0025] By means of the above structure: the reed switch 6 is located inside the annular cooling cavity 8, so that the incoming cold air will cool the reed switch, and the cold air will cool the sleeve and thus cool the annular magnet.

[0026] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high temperature resistant liquid level switch, characterized in that: The invention comprises a mounting plate (1), a sleeve (2), a guide rod (3), a floating ball (4), an annular magnet (5), a reed switch (6), a sleeve (7), an air inlet pipe (9), an air pump (10) and an air outlet pipe (11), wherein the bottom end of the mounting plate (1) is fixedly mounted with a sleeve (2) arranged vertically therewith, the sleeve (2) is sleeved with a guide rod (3), the bottom end of the guide rod (3) extends to the bottom of the sleeve (2), the bottom end of the guide rod (3) is mounted with a floating ball (4), the floating ball (4) and the guide rod (3) are detachably connected, the top end of the guide rod (3) is fixedly sleeved with an annular magnet (5), the annular magnet ( 5) is slidably connected to the inner wall of the sleeve (2), a reed switch (6) is fixedly mounted on the sleeve (2), a sleeve (7) coaxial with the sleeve (2) is fixedly mounted on the outer wall of the sleeve (2), an annular cooling cavity (8) is enclosed between the inner wall of the sleeve (7) and the outer wall of the sleeve (2), an air inlet pipe (9) and an air outlet pipe (11) are fixedly mounted on the mounting plate (1), the air inlet pipe (9) is connected to the inner cavity of the annular cooling cavity (8) near the bottom end, the air outlet pipe (11) is connected to the inner cavity of the annular cooling cavity (8) near the top end, and an air pump (10) is fixedly mounted on the pipeline of the air inlet pipe (9).

2. A high temperature resistant liquid level switch according to claim 1, characterized in that: The floating ball (4) and the guide rod (3) are detachably connected by threads.

3. A high temperature resistant liquid level switch according to claim 1, characterized in that: A signal line (12) is fixedly mounted on the mounting plate (1), and the signal line (12) is connected to the reed switch (6).

4. A high temperature resistant liquid level switch according to claim 1, characterized in that: The mounting plate (1) is threadedly connected with mounting bolts (13).

5. The high temperature resistant liquid level switch according to claim 1, characterized in that: The sleeve (2) is provided with a plurality of evenly distributed air holes near the top end thereof.

6. A high temperature resistant liquid level switch according to claim 1, characterized in that: The reed switch (6) is located inside the annular cooling cavity (8).

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