CN110911225A - Magnetic sensitive temperature switch - Google Patents

Abstract

The invention discloses a magnetic-sensing temperature switch, which comprises a reed pipe and a temperature-sensing magnetic group arranged on the reed pipe in a sleeved mode, wherein the temperature-sensing magnetic group comprises a permanent magnet and a temperature-sensing ferrite, the permanent magnet and the temperature-sensing ferrite are mutually spliced, a glass pipe is sequentially divided into a first drivable area, a first sensing blind area, a second drivable area, a second sensing blind area and a third drivable area from left to right, the permanent magnet is arranged on the outer side of the glass pipe and located in the first drivable area or the third drivable area, and the temperature-sensing ferrite is also arranged in the first sensing blind area or the second sensing blind area corresponding to the arrangement position of the permanent magnet. The magnetic temperature switch provided by the invention has the advantages that the structure is simple, the temperature control is accurate, and the distribution characteristics of the driving area and the induction blind area of the reed switch are skillfully utilized; the working effects that the temperature rises, the switch is switched on, and the temperature falls, and the switch is switched off are achieved.

Description

Magnetic sensitive temperature switch

Technical Field

The invention relates to the technical field of temperature sensing control switches, in particular to a magnetic sensing temperature switch.

Background

The magnetic-sensing temperature switch has the advantages of accurate temperature control, small volume, high speed, long service life and the like, and is widely applied to refrigerator temperature compensation, commercial air conditioner temperature control, intelligent toilet bowl temperature control, aquarium temperature control and other fields.

The existing magnetic-sensing temperature switch comprises a temperature sensing magnetic group consisting of two permanent magnets 2 ' and a temperature sensing magnetic ring 3 ', a reed pipe 1 ' and a shell (see figure 6), wherein the temperature sensing magnetic group is sleeved on the reed pipe and is positioned between the two permanent magnets, the temperature sensing magnetic ring is positioned in the middle of the reed pipe, and the two permanent magnets are positioned in a conduction induction blind area of the reed pipe; when the environmental temperature is reduced and is lower than the Curie temperature of the temperature sensing magnetic ring, the temperature sensing magnetic ring has magnetism and is externally shown as a magnetic field direction together with the two permanent magnets, the magnetic field is positioned in a conduction induction zone of the reed pipe, the two pins of the reed pipe are magnetized and attracted together, and the reed pipe is conducted; when the environmental temperature rises and exceeds the Curie temperature of the temperature sensing magnetic ring, the temperature sensing magnetic ring loses magnetism, the magnetic fields of the two permanent magnets fall into the conduction induction section of the reed pipe, and the reed pipe is disconnected.

Therefore, the temperature control principle of the common magnetic-sensing temperature switch is that the temperature rising switch is turned off, and the temperature reducing switch is turned on; therefore, a magnetic-sensing temperature switch is needed in the market, wherein the temperature rises, the switch is turned on, and the temperature drops, the switch is turned off.

It is seen that improvements and enhancements to the prior art are needed.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide a magnetically sensitive temperature switch that switches on as the temperature rises and switches off as the temperature falls.

In order to achieve the purpose, the invention adopts the following technical scheme:

the magnetic-sensing temperature switch comprises a reed pipe and a temperature-sensing magnetic group arranged on the reed pipe in a sleeved mode, wherein the reed pipe comprises a glass pipe body, a first pin fixing part and a second pin fixing part which are arranged at two ends of the glass pipe body respectively, a first reed and a second reed which are arranged in the glass pipe body and are positioned at the left end and the right end of the glass pipe body respectively, and pins connected with the first reed and the second reed respectively, the pins of the first reed and the second reed correspondingly penetrate through the first pin fixing part and the second pin fixing part, the free ends of the first reed and the second reed are arranged at intervals relatively, the temperature-sensing magnetic group comprises a permanent magnet and a temperature-sensing ferrite, the permanent magnet and the temperature-sensing ferrite are spliced mutually, and the glass pipe is sequentially divided into a first drivable area, a first sensing blind area, a second drivable area and a first sensing area from left to right, The permanent magnet is arranged outside the glass tube and is positioned in the first drivable area or the third drivable area, the temperature sensing ferrite is also arranged in the first sensing blind area or the second sensing blind area corresponding to the arrangement position of the permanent magnet, and the permanent magnet can magnetize the reed when the temperature sensing ferrite is not magnetized so that the first reed and the second reed are magnetically attracted and connected; the permanent magnet can form a magnetic field which can not cause the first reed and the second reed to generate magnetic attraction with the temperature sensing ferrite when the temperature sensing ferrite has magnetism.

The length of the glass tube is L, the length of the first drivable area is D1, the length of the first sensing dead zone is D2, the length of the second drivable area is D3, the length of the second sensing dead zone is D4, and the length of the third drivable area is D5, then D1+ D2+ D3+ D4+ D5 is L, D1 is D2 is D4 is D5 is L × 0.15, and D3 is L × 0.4.

When the thickness of the permanent magnet is H and the thickness of the temperature sensitive ferrite is M, H is L × 0.15 and M is L × 0.15.

The surface magnetic beam density of the permanent magnet is more than 100 mT.

The permanent magnet and the temperature sensing ferrite are both of annular structures, and the temperature sensing ferrite and the permanent magnet are both sleeved on the outer edge of the glass tube.

The magnetic-sensing temperature switch also comprises a hollow shell and leads respectively welded on pins at two ends of the reed pipe, the right end of the shell is provided with an opening, the reed pipe and the temperature sensing magnetic group are transversely arranged in the inner cavity of the shell, sealing resin is filled in the inner cavity of the shell, the sealing resin completely wraps the reed pipe, the temperature sensing magnetic group, the pins and the lead connecting part in the shell, and the filling depth of the sealing resin is flush with the right end opening of the shell.

Pins at two ends of the reed pipe are connected with the lead wire in a soldering tin mode, and the lead wire connected with the pin corresponding to the first reed is provided with a bending part.

And inert gas is filled in the glass tube.

Has the advantages that:

the invention provides a magnetic-sensing temperature switch, compared with the prior art, an induction magnetic group only comprises a permanent magnet and an induction ferrite, when the environmental temperature is lower than the Curie temperature value of the temperature-sensing ferrite, the temperature-sensing ferrite has magnetism and is combined with the permanent magnet to show a magnetic field direction, and the magnetic field is positioned in an induction blind area of a reed switch, so that a first reed and a second reed cannot be magnetized, and the magnetic-sensing temperature switch is switched off; when the environment temperature is higher than the Curie temperature value of the temperature sensing ferrite, the temperature sensing ferrite loses magnetism, the permanent magnet is positioned in the driving area of the reed switch and has enough magnetic force, so that the first reed and the second reed are magnetized, the first reed and the second reed are magnetically attracted, and the magnetic sensing temperature switch is switched on. Therefore, the magnetic temperature switch provided by the invention has the advantages of simple structure and accurate temperature control, and skillfully utilizes the distribution characteristics of the drivable area and the induction blind area of the reed switch; the working effects of temperature rise, switch on and switch off of the temperature drop switch are realized, the action effect is opposite to that of the temperature rise switch and the temperature drop switch in the existing magnetic-sensing temperature switch, and the temperature control device can be applied to temperature control of different products (such as radiators and the like).

Drawings

Fig. 1 is a schematic structural diagram of a magnetic temperature-sensitive switch provided by the present invention.

FIG. 2 is a schematic diagram showing the distribution of the drivable area and the dead zone of the reed switch in the magnetic temperature-sensitive switch according to the present invention.

Fig. 3 is a schematic structural diagram of the magnetic temperature-sensitive switch provided by the present invention when turned on.

Fig. 4 is a schematic structural diagram of the magnetic temperature-sensitive switch provided by the present invention when it is turned off.

Fig. 5 is a schematic diagram of a conducting sensing area of a reed switch in the magnetic temperature sensor switch according to the present invention.

Fig. 6 is a schematic structural diagram of a conventional magnetic temperature-sensitive switch.

Detailed Description

The invention provides a magnetic-sensing temperature switch, which is further described in detail below by referring to the attached drawings and embodiments in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.

Referring to fig. 1-5, the present invention provides a magnetic temperature sensitive switch, wherein the dotted lines in fig. 3 and 4 represent the magnetic field lines formed by the temperature sensitive magnetic set.

The magnetic temperature-sensitive switch comprises a reed pipe 1 and a temperature-sensing magnetic group 2 arranged on the reed pipe in a sleeved mode, wherein the reed pipe 1 comprises a glass pipe 11 consisting of a glass pipe main body 11a, a first pin fixing part 11b and a second pin fixing part 11c which are arranged at two ends of the glass pipe main body respectively, a first reed 12 and a second reed 13 which are arranged in the glass pipe main body and are positioned at the left end and the right end of the glass pipe main body respectively, and pins 14 connected with the first reed and the second reed respectively, the pins 14 of the first reed and the second reed correspondingly penetrate through the first pin fixing part 11b and the second pin fixing part 11c, the free ends of the first reed 12 and the second reed 13 are arranged at intervals, the temperature-sensing magnetic group 2 comprises a permanent magnet 21 and a temperature-sensing ferrite 22, the permanent magnet 21 and the temperature-sensing ferrite 22 are spliced with each other, and the glass pipe 11 is sequentially divided into a first drivable area A, a second area A, a, The permanent magnet is arranged outside the glass tube and positioned in the first drivable area A or the third drivable area E, the temperature sensing ferrite is also arranged in the first inducting blind area C or the second inducting blind area D corresponding to the arrangement position of the permanent magnet, and the permanent magnet can magnetize the reed to enable the first reed 12 and the second reed 13 to be magnetically attracted and connected when the temperature sensing ferrite is not magnetic; the permanent magnet can form a magnetic field which can not cause the first reed and the second reed to generate magnetic attraction with the temperature sensing ferrite when the temperature sensing ferrite has magnetism.

Here, the temperature sensitive ferrite 22 is soft magnetic, and the curie temperature value of the temperature sensitive ferrite 22 can be set by changing the chemical composition and the crystal structure thereof, so as to meet different product requirements. When the temperature sensing ferrite is higher than the Curie temperature value, the temperature sensing ferrite becomes a paramagnet and loses magnetism; when the temperature-sensitive ferrite is lower than the Curie temperature value, the temperature-sensitive ferrite becomes a ferromagnet and has magnetism.

In fig. 2 and 5, the drivable area and the sensing blind area are permanent magnets moving along the axial direction of the reed switch, the part capable of conducting the reed switch is the drivable area, and the part incapable of conducting the reed switch is the sensing blind area; sections S1 and S2 represent the circumferential extent of the drivable region outside of the reed switch; the M region (the region outside the dotted line) represents the circumferential range of the induction blind zone outside the reed pipe.

When the environment temperature is lower than the Curie temperature value of the temperature sensing ferrite, the temperature sensing ferrite 22 has magnetism and is combined with the permanent magnet 21 to show a magnetic field direction outwards, and the magnetic field is positioned in an induction blind area of the reed switch, so that the first reed 12 and the second reed 13 cannot be magnetized, and the magnetic sensing temperature switch is switched off; when the environmental temperature is higher than the curie temperature value of the temperature sensing ferrite 22, the temperature sensing ferrite 22 loses magnetism, the permanent magnet 21 is located in the drivable area of the reed switch 11 and has enough magnetic force, so that the first reed 12 and the second reed 13 are magnetized, the first reed 12 and the second reed 13 are magnetically attracted, and the magnetic-sensing temperature switch is turned on. Therefore, the magnetic temperature switch provided by the invention has the advantages of simple structure and accurate temperature control, and skillfully utilizes the distribution characteristics of the drivable area and the induction blind area of the reed switch; the working effects of temperature rise, switch on and switch off of the temperature drop switch are realized, the action effect is opposite to that of the temperature rise switch and the temperature drop switch in the existing magnetic-sensing temperature switch, and the temperature control device can be applied to temperature control of different products (such as radiators and the like).

Since the length specification of the reed switch on the market is not uniform, the section length of the driving area and the induction blind area on the reed switch is determined by the technical personnel in the field; the length of the glass tube 11 is L, the length of the first drivable area is D1, the length of the first sensing dead zone is D2, the length of the second drivable area is D3, the length of the second sensing dead zone is D4, and the length of the third drivable area is D5, then D1+ D2+ D3+ D4+ D5 is L, D1-D2-D4-D5-L × 0.15, and D3-L × 0.4.

Preferably, the permanent magnet has a thickness of H, and the temperature sensitive ferrite has a thickness of M, where H is L × 0.15 and M is L × 0.15. Through setting up like this, guarantee that the thickness of permanent magnet and temperature sensing ferrite can correspond and be stained with drivable district and response blind area, guarantee when response ferrite becomes ferromagnet and fall into the response blind area of tongue tube with the magnetic field that the permanent magnet formed together, can not magnetize the reed.

Preferably, the surface magnetic flux density of the permanent magnet is greater than 100mT, so that the magnetic force of the permanent magnet is sufficient, and the reed pipe can be triggered to be conducted by the magnetic field intensity of the permanent magnet.

Preferably, the permanent magnet 21 and the temperature sensing ferrite 22 are both in an annular structure, and the temperature sensing ferrite 22 and the permanent magnet 21 are both sleeved on the outer edge of the glass tube.

Specifically, referring to fig. 1, the magnetic temperature-sensitive switch further includes a hollow housing 3 and leads 4 welded to the pins at the two ends of the reed pipe, respectively, the right end of the housing 3 is provided with an opening, the reed pipe 1 and the temperature-sensing magnetic assembly 2 are transversely disposed in an inner cavity of the housing, a sealing resin 5 is filled in the inner cavity of the housing, the sealing resin 5 completely wraps the reed pipe 1, the temperature-sensing magnetic assembly 2, the pins 4 and the lead connecting portion in the housing, and the filling depth of the sealing resin is flush with the right end opening of the housing. The magnetic-sensing temperature switch has a compact structure, is convenient to assemble, and can effectively reduce the die sinking cost because the shell has no redundant structure; the sealing resin is preferably an epoxy resin.

Preferably, the leads 14 at both ends of the reed switch are connected to the lead by means of solder 6, and the lead connected to the corresponding lead of the first reed 12 is provided with a bent portion 41. The lead 4 can be prevented from interfering with the reed switch 1 by arranging the bending part 41, and the welding quality and the assembling precision are improved.

In order to prevent arcing, the glass tube 11 is filled with an inert gas, and the contact portion between the first spring and the second spring is prevented from being oxidized.

It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the protective scope of the present invention.

Claims (8)

1. The utility model provides a magnetism sensing temperature switch, includes the tongue tube and sets up the temperature sensing magnetic unit of establishing on the tongue tube at the cover, a serial communication port, the tongue tube includes the glass pipe of compriseing glass pipe main part and the first pin fixed part and the second pin fixed part that set up respectively at glass pipe main part both ends, sets up in the glass pipe main part and be located the first reed and the second reed of glass pipe main part left end and right-hand member respectively, and the pin of being connected with first reed and second reed respectively, the pin of first reed and second reed is corresponding to wear to establish on first pin fixed part and second pin fixed part, and the free end of first reed and second reed is relative interval setting, a permanent magnet and a temperature sensing ferrite that temperature sensing magnetic unit includes, permanent magnet and temperature sensing ferrite splice each other, the glass pipe divide into first drivable district in proper order, first response blind area, from left to right, The permanent magnet is arranged outside the glass tube and is positioned in the first drivable area or the third drivable area, the temperature sensing ferrite is also arranged in the first sensing blind area or the second sensing blind area corresponding to the arrangement position of the permanent magnet, and the permanent magnet can magnetize the reed to enable the first reed and the second reed to be magnetically attracted and connected when the temperature sensing ferrite is not magnetic; the permanent magnet can form a magnetic field which can not cause the first reed and the second reed to generate magnetic attraction with the temperature sensing ferrite when the temperature sensing ferrite has magnetism.

2. The magnetically sensitive temperature switch of claim 1, wherein the glass tube has a length of L, the first actuatable region has a length of D1, the first sensing dead zone has a length of D2, the second actuatable region has a length of D3, the second sensing dead zone has a length of D4, and the third actuatable region has a length of D5, such that D1+ D2+ D3+ D4+ D5-L, D1-D2-D4-L5-L × 0.15, and D3-L × 0.4.

3. The magnetically sensitive temperature switch according to claim 2, wherein the thickness of the permanent magnet is H, and the thickness of the temperature sensitive ferrite is M, and then H ═ lx0.15 and M ═ lx0.15 are provided.

4. The magnetically sensitive temperature switch of claim 1, wherein the surface magnetic flux density of the permanent magnet is greater than 100 mT.

5. The magnetic temperature-sensitive switch of claim 1, wherein the permanent magnet and the temperature-sensitive ferrite are both in a ring structure, and both the temperature-sensitive ferrite and the permanent magnet are sleeved on the outer edge of the glass tube.

6. The magnetic temperature-sensitive switch of claim 1, further comprising a hollow housing, and leads welded to the pins at the two ends of the reed pipe, respectively, wherein the right end of the housing is open, the reed pipe and the temperature-sensing magnetic assembly are disposed in the inner cavity of the housing, the inner cavity of the housing is filled with a sealing resin, the sealing resin completely covers the reed pipe, the temperature-sensing magnetic assembly, the pins and the lead connecting portion in the housing, and the filling depth of the sealing resin is flush with the right end opening of the housing.

7. The magnetically sensitive temperature switch according to claim 6, wherein the leads at the two ends of the dry reed pipe are connected with the lead by soldering, and the lead connected with the corresponding lead of the first reed is provided with a bent portion.

8. The magnetically sensitive temperature switch of claim 1, wherein the glass tube is filled with an inert gas.

Images