CN210893432U

CN210893432U - Temperature alarm device

Info

Publication number: CN210893432U
Application number: CN201921507718.4U
Authority: CN
Inventors: 刘朝红
Original assignee: Hisense Guangdong Kitchen and Bath System Co Ltd
Current assignee: Hisense Guangdong Kitchen and Bath System Co Ltd
Priority date: 2019-09-10
Filing date: 2019-09-10
Publication date: 2020-06-30
Anticipated expiration: 2029-09-10

Abstract

The utility model discloses a temperature alarm device relates to temperature detection technical field. The temperature alarm device in the utility model comprises an evaporation chamber and a condensation chamber positioned above the evaporation chamber, layered liquid metal and fluid medium are arranged in the evaporation chamber from bottom to top, one end of an ascending pipe and one end of a descending pipe are inserted into the condensation chamber, the other end of the ascending pipe and the other end of the descending pipe are inserted into the liquid metal, at least one alarm module is arranged on a pipe section of the ascending pipe and/or the descending pipe between the evaporation chamber and the condensation chamber, the alarm module comprises an electrode pair, a permanent magnet and an alarm device, a first electrode and a second electrode in the electrode pair are positioned at the same horizontal position, one end of the first electrode and one end of the second electrode are inserted into the ascending pipe, and the permanent magnet is positioned on two opposite sides of the ascending pipe, the other ends of the first electrode and the second electrode are positioned outside the ascending pipe and are connected with the alarm device, and the direction of the magnetic field applied by the permanent magnet is vertical to the direction of the connecting line between the first electrode and the second electrode.

Description

Temperature alarm device

Technical Field

The utility model relates to a temperature detects relevant technical field, especially relates to a temperature alarm device.

Background

With the increasing economic level and quality of life, more and more household appliances such as ovens, electric water heaters, electric baking pans, etc. are becoming popular in homes. Taking an electric water heater as an example, the heat preservation temperature is usually 65-75 ℃, hot water in an inner container of the water heater and cold water in a tap water pipe are mixed by a water mixer and then warm water suitable for bathing of a human body can be output, however, the water mixer is manually operated by mistake, the temperature of the outlet water is too high or too low, when a water valve controlled by the water mixer is pushed to a hot water side, hot water with the temperature of 65-75 ℃ flows out from a shower head, and instant scalding is caused. Taking the metal baking tray and the cooker of the oven as an example, after the metal baking tray and the cooker of the oven are used, the power supply of the metal baking tray and the cooker of the oven is generally disconnected, and at the moment, the metal baking tray and the cooker of the oven are in a closed state, so that a user can easily misunderstand that the metal baking tray and the cooker of the oven can be directly touched, but the surface temperature of the metal baking tray and the cooker of the oven is still high within a period of time after the power supply of the metal baking tray and the cooker of the oven is cut off, and the surface temperature of the metal baking tray and the cooker of.

The alarm device of the prior art thermometer generally comprises a mercury bulb 01, a cavity 02 and a wire 03 enclosed at the upper end of the cavity 02 of the thermometer, as well as a power supply 04 in the control circuit and a power supply 05 in the operating circuit, as shown in fig. 1. The working principle of the alarm device of the thermometer is as follows: when the thermometer is used for measuring body temperature, the power supply 04 in the control circuit and the power supply 05 in the working circuit are electrified, the temperature of the thermometer rises, the mercury surface rises, and due to the fact that mercury is a conductor, when the mercury surface rises to the temperature corresponding to the lower end of the metal wire 03, the control circuit is connected, current passes through the coil in the electromagnet coil 06, the electromagnet in the electromagnet coil 06 can generate magnetic attraction to the armature 07, the contact switch is closed, the working circuit is connected, and the alarm device 08 sends out an alarm signal. However, the control circuit and the working circuit need to be provided with electric energy to alarm the temperature, so that the use of the temperature alarm device causes unnecessary energy waste.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a temperature alarm device for the power of solving among the current temperature alarm device needs consumes extra electric energy, thereby causes the extravagant problem of the energy.

In order to achieve the above object, an embodiment of the present invention provides a temperature alarm device, which includes an evaporation chamber and a condensation chamber located above the evaporation chamber, wherein layered liquid metal and fluid medium are disposed in the evaporation chamber from bottom to top, one end of an ascending tube and one end of a descending tube are inserted into the condensation chamber, the other end of the ascending tube and the other end of the descending tube are inserted into the liquid metal, a horizontal plane where the mouth of the liquid metal inserted into the ascending tube is located is higher than a horizontal plane where the mouth of the liquid metal inserted into the descending tube is located, at least one alarm module is disposed on a tube section between the evaporation chamber and the condensation chamber of the descending tube, the alarm module includes an electrode pair, a permanent magnet and an alarm device, the electrode pair includes a first electrode and a second electrode, the first electrode and the second electrode are located at the same horizontal position, one ends of the first electrode and the second electrode are inserted into the ascending pipe and are positioned at two opposite sides of the ascending pipe, and the other ends of the first electrode and the second electrode are positioned outside the ascending pipe and are connected with the alarm device; or one end of the first electrode and one end of the second electrode are inserted into the interior of the downcomer and are positioned at two opposite sides of the downcomer, the other end of the first electrode and the other end of the second electrode are positioned outside the downcomer and are connected with the alarm device, and the direction of the magnetic field applied by the permanent magnet is perpendicular to the direction of a connecting line between the first electrode and the second electrode.

Compared with the prior art, the embodiment of the utility model provides an in the inside of evaporating chamber among the temperature alarm device is equipped with the liquid metal and the fluid medium of layering from supreme down, show that the proportion of liquid metal is far greater than the proportion of fluid medium. When the evaporating chamber in the temperature alarm device is contacted with a measured object, the liquid metal in the evaporating chamber absorbs heat and heats the fluid medium on the upper layer, the volume of the fluid medium expands after the fluid medium absorbs heat and is changed into the gaseous fluid medium, so that the pressure inside the evaporating chamber is increased, and the liquid metal enters the ascending pipe and the descending pipe under the driving of the gas pressure in the evaporating chamber. The pressure inside the evaporation chamber is increased continuously, so that the layered surface of the liquid metal and the fluid medium is reduced continuously, and the horizontal plane of the pipe orifice of the ascending pipe inserted into the liquid metal is higher than the horizontal plane of the pipe orifice of the descending pipe inserted into the liquid metal, therefore, the layered surface reaches the lower end of the ascending pipe firstly in the process of descending and enters the ascending pipe under the driving of the gas pressure. When liquid metal and gaseous fluid medium enter the condensing chamber through the ascending pipe and are radiated, the gaseous fluid medium is condensed and releases heat to become the liquid fluid medium, the liquid metal and the liquid fluid medium sequentially pass through the descending pipe and fall back to the evaporating chamber under the action of gravity, the layered surfaces of the liquid metal and the liquid medium submerge one end of the ascending pipe in the liquid metal again, the liquid metal continuously absorbs heat to heat the fluid medium, the fluid medium continuously absorbs heat to be vaporized, and the liquid metal and the fluid medium enter the condensing chamber through the ascending pipe under the driving of gas pressure. After a period of time, the fluid in the ascending pipe and the descending pipe is a section of liquid metal, a section of fluid medium, … …, a section of liquid metal and a section of fluid medium, because the ascending pipe and/or the descending pipe is provided with an alarm module, the alarm module comprises an electrode pair, a permanent magnet and an alarm device, the direction of the magnetic field applied by the permanent magnet is vertical to the axial direction of the ascending pipe and/or the descending pipe, namely the position of the electrode pair is in the magnetic field range of the permanent magnet. Therefore, when the liquid metal flows through the alarm module on the ascending pipe, the liquid metal can do cutting magnetic induction line motion in the magnetic field generated by the permanent magnet, so that the liquid metal generates current, the current is input through one end of the first electrode and the second electrode, which are inserted into the inner surface of the ascending pipe, and is output from one end of the first electrode and the second electrode, which are positioned outside the ascending pipe, and the alarm device is driven to send out an alarm signal; or when the liquid metal flows through the alarm module on the downcomer, the liquid metal can do cutting magnetic induction line motion in the magnetic field generated by the permanent magnet, so that the liquid metal generates current, the current is input through one end of the first electrode and the second electrode, which are inserted into the inner surface of the downcomer, and is output from one end of the first electrode and the second electrode, which are positioned outside the downcomer, and the alarm device is driven to send out an alarm signal. Therefore, the temperature alarm device generates current by utilizing the movement of cutting magnetic induction lines of the liquid metal in the permanent magnet without arranging a power supply, thereby achieving the beneficial effect of saving energy.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a temperature alarm device in the prior art;

FIG. 2 is a schematic view of the scald temperature and the water contact time of a human body;

fig. 3 is a schematic structural view of a temperature alarm device in an embodiment of the present invention;

fig. 4 is a schematic structural view of an embodiment of the present invention, in which an electrode pair is disposed on the ascending tube.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The terms "central," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

At present, household appliances and products such as ovens, water heaters, cooking utensils, cookers and the like generally lack temperature alarm detection devices. Taking hot water as an example, hot water at 55 ℃ and above can cause a human body to be slightly scalded, partially scalded and completely scalded according to the contact time, even if the hot water is hot water at 50 ℃, the contact time is long, the human body can be slightly scalded, as shown in fig. 2, and therefore, in order to avoid scalding of a user by a heating device, a heated device and high-temperature liquid, a temperature alarm device is very necessary.

Referring to fig. 3 to 4, a temperature alarm device provided by an embodiment of the present invention includes an evaporation chamber 1, and a condensation chamber 2 located above the evaporation chamber 1, the evaporation chamber 1 is provided with layered liquid metal 3 and fluid medium 4 from bottom to top, one end of an ascending tube 5 and one end of a descending tube are inserted into the condensation chamber 2, the other end of the ascending tube 5 and the other end of the descending tube 6 are inserted into the liquid metal 3, the horizontal plane where the ascending tube 5 is inserted into the orifice of the liquid metal 3 is higher than the horizontal plane where the descending tube 6 is inserted into the orifice of the liquid metal 3, at least one alarm module is provided on the tube section of the ascending tube 5 and/or the descending tube 6 located between the evaporation chamber 1 and the condensation chamber 2, the alarm module includes an electrode pair 7, a permanent magnet and an alarm device, the electrode pair 7 includes a first electrode 71 and a second electrode 72, the first electrode 71 and the second electrode 72 are located at the same, one ends of the first electrode 71 and the second electrode 72 are inserted into the ascending pipe 5 and are positioned at two opposite sides of the ascending pipe 5, and the other ends of the first electrode 71 and the second electrode 72 are positioned outside the ascending pipe 5 and are connected with an alarm device; or one end of the first electrode 71 and one end of the second electrode 72 are inserted into the interior of the downcomer 6 and are located on two opposite sides of the downcomer 6, the other end of the first electrode 71 and the other end of the second electrode 72 are located outside the downcomer 6 and are connected with the alarm device, and the direction of the magnetic field applied by the permanent magnet is perpendicular to the connecting line direction between the first electrode 71 and the second electrode 72.

Compared with the prior art, the embodiment of the utility model provides an in the inside of evaporating chamber 1 among the temperature alarm device is equipped with the liquid metal 3 and the fluid medium 4 of layering from supreme down, show that the proportion of liquid metal 3 is far greater than the proportion of fluid medium 4. When the evaporation chamber 1 in the temperature alarm device is contacted with an object to be measured, the liquid metal 3 in the evaporation chamber 1 absorbs heat and then heats the fluid medium 4 on the upper layer, the fluid medium 4 absorbs heat and changes into a gaseous fluid medium, and then the volume of the gaseous fluid medium expands, so that the pressure inside the evaporation chamber 1 is increased, and the liquid metal 3 enters the ascending pipe 5 and the descending pipe 6 under the driving of the gas pressure in the evaporation chamber 1. The pressure inside the evaporation chamber 1 is increased continuously so that the stratification plane of the liquid metal 3 and the fluid medium 4 is lowered continuously, and the level of the mouth of the riser 5 inserted into the liquid metal 3 is higher than the level of the mouth of the downcomer 6 inserted into the liquid metal 3, whereby the stratification plane reaches the lower end of the riser 5 first during the lowering process and enters the riser 5 under the driving of the gas pressure. When liquid metal 3 and gaseous fluid medium enter a condensing chamber 2 through an ascending pipe 5 for heat dissipation, the gaseous fluid medium is condensed and releases heat to be changed into the liquid fluid medium, the liquid metal 3 and the liquid fluid medium sequentially pass through a descending pipe 6 and fall back to an evaporation chamber 1 under the action of gravity, the layered surfaces of the liquid metal 3 and the liquid medium 4 submerge one end of the ascending pipe 5 in the liquid metal 3 again, the liquid metal 3 continuously absorbs heat to heat the liquid medium 4, the liquid medium 4 continuously absorbs heat to be vaporized, and the liquid metal 3 and the liquid medium 4 enter the condensing chamber 2 through the ascending pipe 5 under the driving of gas pressure. After a period of time, the fluid in the ascending pipe 5 and the descending pipe 6 is a section of liquid metal, a section of fluid medium, … …, a section of liquid metal, and a section of fluid medium, because the ascending pipe 5 and/or the descending pipe 6 is provided with an alarm module, the alarm module comprises an electrode pair 7, a permanent magnet and an alarm device, the direction of the magnetic field applied by the permanent magnet is vertical to the axial direction of the ascending pipe 5 or the descending pipe 6, namely the position of the electrode pair 7 is in the magnetic field range of the permanent magnet. Therefore, when the liquid metal 3 flows through the alarm module on the riser 5, the liquid metal 3 can make a cutting magnetic induction line movement in the magnetic field generated by the permanent magnet, so that the liquid metal 4 generates a current, the current is input through one end of the first electrode 71 and the second electrode 72 inserted into the inner surface of the riser 5, is output from one end of the first electrode 71 and the second electrode 72 positioned outside the riser 5, and drives the alarm device to send out an alarm signal; or when the liquid metal 4 flows through the alarm module on the downcomer 6, the liquid metal 4 can do cutting magnetic induction line movement in the magnetic field generated by the permanent magnet, so that the liquid metal 4 generates current, the current is input through one end of the first electrode 71 and the second electrode 72 inserted into the inner surface of the downcomer 6, the current is output from one end of the first electrode 71 and the second electrode 72 positioned outside the downcomer 6, and the alarm device is driven to send out an alarm signal. The temperature alarm device generates current by utilizing the liquid metal 3 to do cutting magnetic induction line motion in the permanent magnet, and does not need to be provided with a power supply, thereby achieving the beneficial effect of saving energy.

It should be noted that: the number of the alarm devices in the alarm modules can be one or more, when one alarm device is provided, the pairs of electrode pairs 7 in the alarm modules are all connected with the same alarm device, and when a plurality of alarm devices are provided, the pairs of electrode pairs 7 in the alarm modules are connected with the alarm devices in a one-to-one correspondence manner. Illustratively, the electrode pair is mounted on the ascending tube, the first electrode 71 and the second electrode 72 are mounted on the left and right opposite sides of the ascending tube, and the direction of the connecting line between the first electrode 71 and the second electrode 72 is the left-right direction, i.e. the X direction in fig. 4; the direction of the magnetic field applied by the permanent magnet is the inner and outer direction, namely the Y direction in fig. 4; the up-down direction is the Z direction in fig. 4, as shown in fig. 4.

Alternatively, the above-mentioned downcomer 6 is inserted into the mouth of the condensation chamber 2 at a level equal to the level at which the riser 5 is inserted into the mouth of the condensation chamber 2. Alternatively, the nozzles of the downcomer 6 inserted into the condensation chamber 2 are located at a level lower than the level at which the riser 5 is inserted into the condensation chamber 2. In order to guarantee under the effect of fluidic gravity, liquid metal 3 and liquid fluid medium in the condensation chamber 2 can flow into evaporation chamber 1 from downcomer 6 easily in, the utility model discloses preferably make above-mentioned downcomer 6 insert the horizontal plane that the mouth of pipe of condensation chamber 2 was located be less than the horizontal plane that riser 5 inserted the mouth of pipe of condensation chamber 2 and located, can also reach and need not to add the conveyor of liquid metal 3 and fluid medium 4, just can realize the effect of the recirculation of liquid metal 3 and fluid medium 4 in evaporation chamber 1 and condensation chamber 2 for temperature alarm device's simple structure.

If the cross-sectional area of the ascending pipe 5 is smaller than or equal to the cross-sectional area of the descending pipe 6, the liquid metal 3 and the liquid fluid medium cannot fall back into the evaporation chamber 3 from the condensation chamber 2, so that the cross-sectional area of the ascending pipe 5 is larger than the cross-sectional area of the descending pipe 6 in the embodiment of the present invention, and the liquid metal 3 and the liquid fluid medium in the ascending pipe 5 and the descending pipe 6 can be ensured to realize recirculation under the action of conditions such as mass conservation and stress balance.

It should be noted that: the arrangement of the electrode pairs 7 on the upcomer 5 and/or the downcomer 6 can be divided into the following three cases:

first, be provided with electrode pair 7 on tedge 5, first electrode 71 and second electrode 72 set up on tedge 5 promptly, in order to prevent that the induced-current that liquid metal 3 cutting permanent magnet's magnetic induction line produced runs off along the pipe wall of tedge 5, and lead to the unable alarm device that flows in of electric current, alarm device can't send temperature alarm signal, consequently the embodiment of the utility model provides an in the tedge 5 be the insulating tube.

Secondly, the descending tube 6 is provided with an electrode pair 7, and similarly, induced current generated by the magnetic induction line of the liquid metal 3 cutting the permanent magnet is prevented from flowing along the tube wall of the descending tube 6, and the descending tube 6 is also an insulating tube.

Thirdly, the ascending pipe 5 and the descending pipe 6 are both provided with the electrode pairs 7, and similarly, induced current generated by the magnetic induction lines of the permanent magnets cut by the liquid metal 3 in the ascending pipe 5 is prevented from flowing along the pipe wall of the ascending pipe 5, induced current generated by the magnetic induction lines of the permanent magnets cut by the liquid metal 3 in the descending pipe 6 is prevented from flowing along the pipe wall of the descending pipe 6, and both the ascending pipe 5 and the descending pipe 6 are insulating pipes, so that the working reliability of the alarm device is improved.

Alternatively, the riser 5 and the downcomer 6 are glass insulated tubes, ceramic insulated tubes, or other high temperature resistant insulated tubes, and the first electrode 71 and the second electrode 72 may be conductive glass electrodes, noble metal electrodes, or oxide electrodes. When the ascending pipe 5 and the descending pipe 6 are glass pipes and the electrode pair 7 is conductive glass, the electrode pair 7 can be connected with the ascending pipe 5 and/or the descending pipe 6 through a welding process, so that the connection position of the electrode pair 7 and the ascending pipe 5 and/or the descending pipe 6 is good in sealing performance and safe and reliable in connection. Optionally, the conductive glass may be FTO conductive glass or ITO conductive glass.

Based on above-mentioned embodiment, above-mentioned temperature alarm device not only can be used for detecting the temperature of testee, can also cool down the testee, when the temperature of testee transmits the liquid metal 3 in the evaporating chamber 1 among the temperature alarm device, liquid metal 3 can absorb partial heat, and liquid metal 3 can heat the fluid medium 4 on upper strata, fluid medium 4 also can absorb partial heat, liquid metal 3 and fluid medium 4 flow into condensing chamber 2 through tedge 5, and dispel the heat and cool down in condensing chamber 2, liquid metal 3 and fluid medium 4 flow into evaporating chamber 1 through downcomer 6 afterwards, thereby reached the effect of cooling down the testee.

In order to accelerate the heat dissipation efficiency of the liquid metal 3 and the fluid medium 4 in the condensation chamber 2, the heat dissipation fins 8 are arranged on the condensation chamber 2, and the heat dissipation area of the condensation chamber 2 is increased by increasing the heat dissipation fins 8, so that the heat dissipation efficiency of the liquid metal 3 and the fluid medium from the evaporation chamber 1 can be improved.

Optionally, the heat dissipation fins 8 are aluminum fins with graphene deposited on the surfaces, and the aluminum fins are light in weight, so that the weight of the whole temperature alarm device can be reduced. Optionally, the heat dissipation fins 8 are copper fins with graphene deposited on the surfaces, and since the heat transfer effect of copper is good, the graphene has a very good heat conduction performance by depositing a graphene coating on the surfaces of the copper fins by a chemical vapor deposition method, so that the heat dissipation effect of the condensation chamber 2 is further improved.

Optionally, above-mentioned alarm device is alarm indicator lamp or audible alarm ware, alarm indicator lamp or audible alarm ware's simple structure, and the cost is lower, and installation simple and convenient, and when the surface temperature of testee exceeded the melting point of liquid metal 3, alarm indicator lamp lights or audible alarm ware rings, reminds the user to touch the testee this moment and has the scald risk, and temperature alarm signal is showing, easily distinguishs.

The frequency of the temperature alarm signal is positively correlated with the temperature of the measured object, namely the temperature of the measured object is higher, the higher the speed of phase change of the liquid metal 3 and the fluid medium 4 is, the more frequently the liquid metal 3 cuts the magnetic induction lines in the ascending pipe 5 and the descending pipe 6 is, the shorter the interval between the temperature alarm signals sent by the alarm device is, namely the more frequently the temperature alarm signals sent by the alarm device are.

Furthermore, a sealing device is arranged at the joint of the ascending pipe 5 and the evaporation chamber 1 and the condensation chamber 2, a sealing device is arranged at the joint of the descending pipe 6 and the evaporation chamber 1 and the condensation chamber 2, and the danger of leakage of the liquid metal 3 and the fluid medium 4 in the evaporation chamber 1 and the condensation chamber 2 is avoided through the sealing devices, so that the problem of low safety and reliability of the temperature alarm device caused by leakage of the liquid metal 3 and the fluid medium 4 is avoided.

Optionally, the sealing device may be an Ethylene Propylene Diene Monomer (EPDM) sealing gasket, an acrylate rubber (ACM) sealing gasket, or other high temperature resistant sealing gaskets, and the present invention is not limited to this, as long as it is ensured that the liquid metal 3 and the fluid medium 4 in the evaporation chamber 1 and the condensation chamber 2 will not leak.

Based on the above embodiment, in order to increase the response speed of the temperature alarm device, the bottom area of the evaporation chamber 1 may be increased, that is, the contact area between the evaporation chamber 1 and the object to be measured is increased, and the heat transfer rate between the object to be measured and the evaporation chamber 1 is increased, so that the temperatures of the liquid metal 3 and the fluid medium 4 are rapidly increased, thereby increasing the response speed of the temperature alarm device.

Similarly, in order to improve the heat dissipation effect of the condensation chamber 2, the heat dissipation area of the condensation chamber 2 can be increased by increasing the surface area of the condensation chamber 2, or the number of the heat dissipation fins arranged on the condensation chamber 2 is increased to increase the heat dissipation area of the heat dissipation fins, so as to increase the heat dissipation area of the condensation chamber 2, and certainly, the surface area of the condensation chamber 2 and the number of the heat dissipation fins can be increased simultaneously, so that the heat dissipation effect of the condensation chamber 2 is better.

Further, in order to improve the heat transfer speed between the object to be measured and the evaporation chamber 1 and the heat dissipation efficiency of the condensation chamber 2, the evaporation chamber 1 and the condensation chamber 2 are both made of metal materials, even if the temperature of the object to be measured is high, the object to be measured can be directly contacted with the object to be measured, and when the object to be measured is solid, the evaporation chamber 1 is directly placed on the surface of the object to be measured; when the measured object is liquid, directly with evaporation chamber 1 submergence in measured liquid can, above-mentioned temperature alarm device's simple to use is convenient, is applicable to multiple detection scene.

Alternatively, the evaporation chamber 1 and the condensation chamber 2 may be made of any one of copper, aluminum, silver, gold, stainless steel, graphite, and high thermal conductivity glass.

It should be noted that: the temperature alarm device can also be used in other places needing temperature alarm, and the melting point of the liquid metal 3 and the boiling point of the fluid medium 4 can be set to different temperatures according to different requirements. For example, in some cases, the alarm is required when the temperature exceeds 50 ℃, and then the liquid metal 3 with the melting point of 50 ℃ and the fluid medium 4 with the boiling point lower than 50 ℃ can be selected; or in other cases, the alarm is needed when the temperature exceeds 20 ℃, and the liquid metal 3 with the melting point of 20 ℃ and the fluid medium 4 with the boiling point lower than 20 ℃ can be selected. The temperature alarm device is simple in structure, good in portability and low in cost. The temperature alarm device can be expanded or reduced in equal proportion during manufacturing according to the volume, the use scene and the application of a measured object, and temperature alarm devices with different specifications can be manufactured.

When the temperature of the measured object is higher than 45 ℃, the human body is in danger of being scalded, therefore, if the temperature alarm device is used for detecting whether the temperature of the measured object is in a range of safe touch of the human body, optionally, the melting point range of the liquid metal 3 is suitably 38-45 ℃, and the liquid metal with the melting point slightly lower than 45 ℃ is selected as a working medium, so that the alarm signal can be sent out when the temperature of the measured object is higher than 45 ℃; in order to ensure that the fluid medium 4 can be heated and vaporized and expanded by the liquid metal 3, the boiling point of the fluid medium 4 is generally selected to be slightly lower than the melting point of the liquid metal 3, and therefore, the range of the boiling point of the fluid medium 4 in the embodiment of the present invention is: 20-45 ℃.

It should be noted that: when the temperature of the measured object is lower than the melting point of the liquid metal 3 and ranges from 38 ℃ to 45 ℃, the liquid metal 3 in the evaporation chamber 1 is in a solid state, although the fluid medium 4 can absorb heat and vaporize, the liquid metal 3 cannot be driven to enter the magnetic induction line generated by cutting the permanent magnet in the ascending pipe 5 or the descending pipe 6 to generate current, and at the moment, the alarm device cannot send out a temperature alarm signal to indicate that the temperature of the measured object in contact with the evaporation chamber 1 is in the range of safe touch of a human body, and the danger of scalding cannot occur after a user touches the measured object.

Alternatively, the liquid metal 3 is a Bi-based liquid metal, wherein the chemical composition atomic ratio of the Bi-based liquid metal is shown in table 1. The chemical composition of the Bi-based liquid metal in the embodiments of the present invention will be further described with reference to the following specific examples.

TABLE 1 atomic ratio of chemical composition of Bi-based liquid metal

Optionally, the ascending pipe 5 and the descending pipe 6 are both glass round pipes, when the inner diameter of the ascending pipe 5 is 4mm, the inner diameter of the descending pipe 6 is 2mm, meanwhile, 11 parts of Sn, 22 parts of Pb, 8 parts of Cd, 41.5 parts of Bi and 17.5 parts of In are taken according to the chemical atomic ratio, Pb, Cd, Bi, Sn and In are sequentially added into a crucible with the temperature of 355 ℃, the temperature is kept for 30min after the metals are completely melted, then the molten metal solution is cooled to the room temperature, so that the liquid metal Bi11Sn22Pb8Cd with the melting point of 40 ℃ is obtained, and the fluid medium 4 is n-pentane with the boiling point of 36.1 ℃.

Optionally, the ascending pipe 5 and the descending pipe 6 are both glass round pipes, when the inner diameter of the ascending pipe 5 is 3mm, the inner diameter of the descending pipe 6 is 2mm, meanwhile, 8.2 parts of Sn, 23 parts of Pb, 5.5 parts of Cd, 44.3 parts of Bi and 19 parts of In are taken according to the chemical atomic ratio, Pb, Cd, Bi, Sn and In are sequentially added into a crucible at the temperature of 355 ℃, the molten metal is kept for storage for 30min after being completely molten, and then the molten metal solution is cooled to the room temperature, so that liquid metal Bi8.2Sn23Pb5.5Cd with the melting point of 45 ℃ is obtained, wherein the fluid medium 4 can be pentene and the boiling point of the fluid medium is 30 ℃; the fluid medium 4 may also be isoamylene, three isomers of which are: 2-methyl-1-butene, 2-methyl-2-butene, 3-methyl-1-butene, the boiling points of the three isomers are respectively: 31.16 ℃; 38.57 ℃; 20.06 ℃.

Optionally, the ascending pipe 5 and the descending pipe 6 are both glass round pipes, when the inner diameter of the ascending pipe 5 is 5mm, the inner diameter of the descending pipe 6 is 2mm, meanwhile, 10 parts of Sn, 21 parts of Pb, 5 parts of Cd, 42 parts of Bi, 4 parts of Hg and 18 parts of Zn are taken according to the chemical atomic ratio, Zn, Pb, Cd, Bi, Sn and Hg are sequentially added into a crucible with the temperature of 450 ℃, the temperature is kept for 30min after the metals are completely melted, then the molten metal solution is cooled to the room temperature, and the Bi-based liquid metal Bi10Sn21Pb5Cd with the melting point of 38-43 ℃ is obtained, wherein the fluid medium 4 can be isopentane, the boiling point of which is 28 ℃, and the fluid medium 4 can also be butyne, and the boiling point of which is 27 ℃.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A temperature alarm device is characterized by comprising an evaporation chamber and a condensation chamber positioned above the evaporation chamber, wherein layered liquid metal and fluid medium are arranged in the evaporation chamber from bottom to top, one end of an ascending pipe and one end of a descending pipe are inserted into the condensation chamber, the other end of the ascending pipe and the other end of the descending pipe are inserted into the liquid metal, the horizontal plane where the pipe orifice of the ascending pipe inserted into the liquid metal is higher than the horizontal plane where the pipe orifice of the descending pipe inserted into the liquid metal is, at least one alarm module is arranged on the pipe section of the ascending pipe and/or the descending pipe positioned between the evaporation chamber and the condensation chamber, each alarm module comprises an electrode pair, a permanent magnet and an alarm device, each electrode pair comprises a first electrode and a second electrode, and the first electrode and the second electrode are positioned at the same horizontal position, one ends of the first electrode and the second electrode are inserted into the ascending pipe and are positioned at two opposite sides of the ascending pipe, and the other ends of the first electrode and the second electrode are positioned outside the ascending pipe and are connected with the alarm device; or one end of the first electrode and one end of the second electrode are inserted into the interior of the downcomer and are positioned at two opposite sides of the downcomer, the other end of the first electrode and the other end of the second electrode are positioned outside the downcomer and are connected with the alarm device, and the direction of the magnetic field applied by the permanent magnet is perpendicular to the direction of a connecting line between the first electrode and the second electrode.

2. The temperature warning device as claimed in claim 1, wherein the level of the nozzle of the downcomer inserted into the condensation chamber is lower than the level of the nozzle of the riser inserted into the condensation chamber.

3. The temperature warning device of claim 1, wherein a cross-sectional area of the riser is greater than a cross-sectional area of the downcomer.

4. The temperature warning device of claim 1, wherein the riser and the downcomer are insulated pipes.

5. The temperature warning device of claim 1, wherein the condensation chamber is provided with heat dissipating fins.

6. The temperature alarm device of claim 5, wherein the heat dissipation fins are copper fins with graphene deposited on the surface.

7. The temperature warning device of claim 1, wherein the warning device is a warning light or an audible alarm.

8. The temperature alarm device according to claim 1, wherein a sealing device is provided at a connection part of the ascending pipe and the evaporation chamber and a connection part of the descending pipe and the evaporation chamber and the condensation chamber.

9. The temperature warning device of claim 1, wherein the evaporation chamber and the condensation chamber are both made of a metallic material.

10. The temperature warning device of claim 1, wherein the melting point of the liquid metal ranges from: 38-45 ℃, and the boiling point of the fluid medium has the value range: 20-45 ℃.