Magnetic temperature controller

Abstract

The application discloses a magnetic sensitive temperature controller, which comprises an outer shell with an open upper end, an inner shell arranged in the inner cavity of the outer shell, a heat-conducting cover arranged on the upper end of the outer shell, a temperature-sensing soft magnet arranged on the top of the inner shell and in heat-conducting connection with the heat-conducting cover, a hard magnet arranged in the inner cavity of the inner shell, a spring arranged between the temperature-sensing soft magnet and the hard magnet, a connecting circuit fixedly arranged in the inner cavity of the outer shell, and a movable contact for turning on or off the connecting circuit; the hard magnet comprises a base and a boss arranged on the base, the movable contact is sleeved on the boss, and the hard magnet is arranged below the temperature-sensing soft magnet. Compared with the existing temperature controller, the on-off of the connecting circuit can be controlled by only the movable contact, and the action push rod is not needed, so that the structure is simpler, and the defects of the action push rod structure are fundamentally solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of temperature controller, in particular to a magnetic temperature controller. BACKGROUND

[0002] The traditional bimetallic strip temperature controller includes a relatively complex action mechanism, the bimetallic strip has a certain curvature, the action push rod needs to match the curvature of the bimetallic strip, the production process is very cumbersome, and the assembly is difficult. Similarly, the existing magnetic temperature controller also has a relatively complex action mechanism like the bimetallic strip temperature controller, needs to set an action push rod at the bottom of the hard magnet, uses the action push rod to trigger the conduction or disconnection of the micro switch, in order to adapt to the installation of the action push rod, a blind hole needs to be opened at the bottom of the hard magnet, and then the action push rod is inserted into the blind hole, but the action push rod and the hard magnet are non-elastic deformation materials, the size processing is difficult, and the matching gap between the two is difficult to control. If the matching gap is too large, it is easy to loosen, and if the matching gap is too small, it is difficult to assemble, so the assembly is very difficult. In addition, after long-term use of the magnetic temperature controller with the action push rod triggering structure, the connection between the action push rod and the hard magnet may be loose, the safety and reliability of the product are greatly reduced, and the user has a safety risk.

[0003] It can be seen that the prior art still needs to be improved and improved. SUMMARY

[0004] In view of the shortcomings of the prior art, the purpose of the present application is to provide a magnetic temperature controller without an action push rod.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] A magnetic temperature controller, comprising an outer shell with an open upper end, an inner shell arranged in the inner cavity of the outer shell, a heat-conducting cover arranged on the upper end of the outer shell, a temperature-sensing soft magnet arranged on the top of the inner shell and in heat-conducting connection with the heat-conducting cover, a hard magnet arranged in the inner cavity of the inner shell, a spring arranged between the temperature-sensing soft magnet and the hard magnet, a connection circuit fixedly arranged in the inner cavity of the outer shell, and a movable contact for turning on or turning off the connection circuit; the hard magnet comprises a base and a boss arranged on the base, and the movable contact is sleeved on the boss; the hard magnet is located below the temperature-sensing soft magnet, and when the temperature-sensing soft magnet and the hard magnet are magnetically attracted, the movable contact is turned on the connection circuit by overcoming the spring force; when the temperature-sensing soft magnet loses magnetism, the hard magnet is pushed away from the temperature-sensing soft magnet by the spring to turn off the connection circuit.

[0007] The movable contact is in the shape of a ring, and each side of the movable contact is provided with a folded ear, and each folded ear is provided with a movable contact point; the inner ring of the movable contact is provided with a bent edge bent upward, and the top ends of the bent edges enclose a circle with a diameter smaller than that of the boss.

[0008] The connecting circuit comprises a first terminal and a second terminal fixedly arranged on the shell, and a first static contact and a second static contact in electrically conductive connection with the first terminal and the second terminal respectively, and a static contact point is arranged on the free end of the first static contact and the second static contact, and the static contact points on the first static contact and the second static contact are directed towards the corresponding moving contact points.

[0009] The first terminal and the second terminal are inserted pieces, and two insertion grooves are symmetrically arranged on the bottom of the shell, the inner ends of the first terminal and the second terminal are inserted into the corresponding insertion grooves, and the outer ends of the first terminal and the second terminal extend to the outside of the shell respectively; the first static contact and the first terminal are connected by a rivet and fixed on the shell, and the second static contact and the second terminal are connected by a rivet and fixed on the shell.

[0010] An annular step is arranged on the inner wall of the inner shell, at least two positioning blocks are protruded inwardly on the inner wall of the inner shell, the temperature-sensing soft magnet comprises a temperature-sensing part in contact with the heat-conducting cover and a positioning part arranged below the temperature-sensing part, a positioning groove adapted to the positioning block is arranged on the positioning part, each positioning block is clamped into the corresponding positioning groove, the diameter of the temperature-sensing part is greater than that of the positioning part, the temperature-sensing part is pressed against the top of the inner shell, and the positioning part is pressed against the step.

[0011] The boss of the hard magnet is arranged in the inner ring of the step, the lower side of the step is provided with two symmetrically arranged limiting protrusions and a plurality of first limiting protrusions arranged at equal angles in the circumferential direction, the limiting protrusions and the first limiting protrusions are arranged on the inner wall of the inner shell and vertically extend downward, and a notch adapted to the limiting protrusion is arranged on the base of the hard magnet.

[0012] A plurality of second limiting protrusions arranged at equal angles in the circumferential direction are arranged on the inner wall of the step.

[0013] A blind hole for mounting a spring is arranged on the upper end of the boss, and the top end of the spring is pressed against the bottom surface of the temperature-sensing soft magnet.

[0014] At least two clamping blocks are arranged on the outer side wall of the upper end of the inner shell, corresponding clamping grooves are arranged on the inner wall of the outer shell, and the inner shell and the outer shell are radially positioned by the clamping blocks and the clamping grooves.

[0015] Advantages:

[0016] The application provides a magnetic temperature controller, compared with the existing temperature controller, only the moving contact can control the conduction and disconnection of the connecting circuit, without using the action push rod, the structure is simpler, and the defects of the action push rod structure are fundamentally solved; the moving contact is firmly sleeved on the boss, the main body of the moving contact is pressed against the base, the assembly is simple, and the loosening does not occur during long-term use, so that the product safety and reliability are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The structural schematic diagram of the magnetic temperature controller provided by the present application.

[0018] Figure 2 The exploded view of the magnetic temperature controller provided by the present application.

[0019] Figure 3 The perspective view of the magnetic temperature controller provided by the present application.

[0020] Figure 4 The perspective view of the moving contact in the magnetic temperature controller provided by the present application.

[0021] Figure 5 The perspective view of the inner shell in the magnetic temperature controller provided by the present application. DETAILED DESCRIPTION

[0022] The present application provides a magnetic temperature controller, in order to make the purpose, technical scheme and effect of the present application more clear and definite, the present application is further explained in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the protection scope of the present application.

[0023] Please refer to Figures 1-3 The present application provides a magnetic temperature controller, which comprises an outer shell 1 with an open upper end, an inner shell 2 arranged in the inner cavity of the outer shell, a heat-conducting cover 3 arranged on the upper end of the outer shell, a temperature-sensing soft magnet 4 arranged on the top of the inner shell and in heat-conducting connection with the heat-conducting cover, a hard magnet 5 arranged in the inner cavity of the inner shell, a spring 6 arranged between the temperature-sensing soft magnet and the hard magnet, a connecting circuit 7 fixedly arranged in the inner cavity of the outer shell, and a moving contact 8 for turning on or off the connecting circuit; the hard magnet 5 comprises a base 51 and a boss 52 arranged on the base, and the moving contact 8 is sleeved on the boss 52; the hard magnet 5 is located below the temperature-sensing soft magnet 4, when the temperature-sensing soft magnet 4 and the hard magnet 5 are magnetically attracted, the moving contact is turned on the connecting circuit against the elastic force of the spring 6; when the temperature-sensing soft magnet 4 loses magnetism, the spring 6 pushes the hard magnet 5 away from the temperature-sensing soft magnet to disconnect the connecting circuit.

[0024] The working principle is briefly described as follows: the heat-conducting cover 3 is in heat-conducting connection with the temperature-sensitive soft magnet 4 (i.e. the heat-conducting cover 3 is tightly attached to the upper end surface of the temperature-sensitive soft magnet 4, or a heat-conducting silicone grease is filled in the gap between the heat-conducting cover 3 and the temperature-sensitive soft magnet 4), the heat generated by the temperature rise of the product main part is transmitted to the temperature-sensitive soft magnet 4 through the heat-conducting cover, when the product main part starts to heat, the temperature of the temperature-sensitive soft magnet 4 is lower than its Curie temperature, the temperature-sensitive soft magnet 4 has magnetism, the temperature-sensitive soft magnet 4 and the ferromagnetic body 5 are magnetically attracted, the boss 51 and the bottom of the temperature-sensitive soft magnet 4 are attracted to each other, the ferromagnetic body 5 is driven to move upward against the gravity and the elastic force of the spring 6, the movable contact 8 sleeved on the boss 51 also moves upward with the boss 51, and the connecting circuit 7 is turned on. When the temperature of the temperature-sensitive soft magnet 4 gradually rises above its Curie temperature, the magnetism of the temperature-sensitive soft magnet 4 disappears, the spring 6 pushes the hard magnet 5 away from the temperature-sensitive soft magnet 4 to disconnect the movable contact 8. Compared with the prior art, only the movable contact 8 is needed to control the turn-on and turn-off of the connecting circuit 7, without using the action push rod, the structure is simpler, and the deficiencies of the action push rod structure are fundamentally solved; the movable contact is firmly sleeved on the boss, the main body of the movable contact is pressed against the base, the assembly is simple, and the loosening does not occur during long-term use, so that the product safety and reliability are ensured.

[0025] Specifically, please refer to Figure 4 , the movable contact 8 is annular, one fold ear 81 is arranged on each side of the movable contact 8, and one movable contact point 82 is arranged on each fold ear; the inner ring of the movable contact 8 is provided with upwardly bent flanges 83, and the circumferential diameter surrounded by the top ends of the flanges 83 is smaller than the diameter of the boss 52. The main body, the flanges and the fold ears of the movable contact are made of sheet metal, have high structural strength, are easy to manufacture, and do not need secondary assembly. During assembly, the movable contact is only needed to be sleeved on the boss until the bottom of the movable contact is pressed against the base; since the circumferential diameter surrounded by the top ends of the flanges is smaller than the diameter of the boss, the flanges are metal sheets and have a certain elastic deformation capacity, the flanges form a radial locking force on the boss, the flanges are tightly pressed against the side wall of the boss, the radial and axial positioning of the movable contact is realized, the loosening of the movable contact during long-term use is prevented, and the trigger position of the movable contact point and the connecting circuit is ensured to be accurate.

[0026] Further, please refer to Figure 1 and Figure 2The connecting circuit 7 comprises a first terminal 71 and a second terminal 72 fixedly arranged on the outer shell, and a first static contact 73 and a second static contact 74 electrically connected with the first terminal 71 and the second terminal 72 respectively, and a static contact 75 arranged on the free end of the first static contact 73 and the second static contact 74, and the static contact 75 on the first static contact 73 and the second static contact 74 faces the corresponding movable contact 82. The first static contact 73 and the second static contact 74 are in C shape, and the side wall of the inner shell is provided with an avoiding opening for the static contact to enter, and the static contact is located above the corresponding movable contact. By such arrangement, the structure of the connecting circuit is compact, the space between the outer shell and the inner shell is ingeniously utilized, and the assembly difficulty is reduced.

[0027] Preferably, referring to Figures 1-3 The first terminal 71 and the second terminal 72 are in the form of a plug, and the bottom of the outer shell 1 is symmetrically provided with two plug slots 11, the inner ends of the first terminal 71 and the second terminal 72 are inserted into the corresponding plug slots 11, and the outer ends of the first terminal 71 and the second terminal 72 extend out of the outer shell respectively; the first static contact 73 and the first terminal 71 are connected and fixed on the outer shell 1 by a rivet 9, and the second static contact 74 and the second terminal 72 are connected and fixed on the outer shell 1 by a rivet 9. By such arrangement, the first terminal, the second terminal, the first static contact and the second static contact are accurately positioned, and will not be deviated after long-term use, and the first terminal and the second terminal can be electrically connected with other electrical components.

[0028] Preferably, referring to Figure 5 The inner wall of the inner shell 2 is provided with an annular step 21, and the inner wall of the inner shell is inwardly protruded with at least two positioning blocks 22, the temperature-sensitive soft magnet 4 comprises a temperature-sensitive part 41 in contact with the heat-conducting cover and a positioning part 42 arranged below the temperature-sensitive part, the positioning part 42 is provided with a positioning groove 43 matched with the positioning block, and each positioning block is clamped in the corresponding positioning groove 43, and the diameter of the temperature-sensitive part 41 is greater than that of the positioning part 42, the temperature-sensitive part 41 is pressed against the top of the inner shell 2, and the positioning part 42 is pressed against the step 21. During assembly, the positioning part of the temperature-sensitive soft magnet is directly arranged in the inner cavity of the inner shell, and the connection is completed, which is convenient and fast; the heat-conducting cover and the step axially position the temperature-sensitive soft magnet to prevent the temperature-sensitive soft magnet from moving due to magnetic attraction; the temperature-sensitive soft magnet is prevented from rotating in the inner shell through the cooperation of the positioning part and the positioning groove.

[0029] Preferably, referring to Figure 2 and Figure 5The boss of the hard magnet 5 is installed in the inner ring of the step 21, the lower side of the step 21 is provided with two symmetrical limiting blocks 23 and a plurality of first limiting convex strips 24 which are arranged at equal angles in the circumference, the limiting blocks 23 and the first limiting convex strips 24 are arranged on the inner wall of the inner shell 2 and extend vertically downward, the base 52 of the hard magnet 5 is provided with a notch 53 which is matched with the limiting convex strip. On the one hand, the limiting convex strip limits the rotation of the hard magnet, ensures the accurate position of the moving contact on the moving contact piece to connect the circuit, on the other hand, the limiting convex strip can guide the vertical upward or downward movement of the hard magnet, and the hard magnet moves smoothly and stably. The first limiting convex strip further limits the radial movement range of the base of the hard magnet, so as to prevent the shaking deviation from being too large.

[0030] Preferably, referring to Figure 5 The inner wall of the step 21 is provided with a plurality of second limiting convex strips 25 which are arranged at equal angles in the circumference. The second limiting convex strip limits the radial movement range of the base of the hard magnet, so as to prevent the shaking deviation from being too large.

[0031] Preferably, referring to Figure 2 The upper end of the boss 51 is provided with a blind hole 54 for installing the spring 6, the top end of the spring 6 abuts against the bottom surface of the temperature-sensitive soft magnet 4. When the ferromagnet and the temperature-sensitive soft magnet are magnetically attracted, the spring is hidden in the blind hole and does not interfere with the connection of the positioning part of the boss and the temperature-sensitive soft magnet.

[0032] Preferably, referring to Figure 2 And Figure 5 The outer side wall of the upper end of the inner shell 2 is provided with at least two clamping blocks 26, the inner wall of the outer shell 1 is provided with corresponding clamping grooves 12, and the inner shell 2 and the outer shell 1 are radially positioned through the clamping blocks 26 and the clamping grooves 12. When assembling, the inner shell can be connected by being inserted into the inner cavity of the outer shell, which is convenient and fast; through the cooperation of the clamping blocks and the clamping grooves, the rotation of the inner shell in the outer shell is prevented.

[0033] It can be understood that, for those skilled in the art, equivalent replacements or changes can be made according to the technical solutions and the inventive concept of the present application, and all these changes or replacements shall belong to the protection scope of the present application.

Claims

1. A magnetic sensitive temperature controller, characterized in that: The invention comprises an outer shell with an opening at the upper end, an inner shell arranged in the inner cavity of the outer shell, a heat-conducting cover arranged on the upper end of the outer shell, a temperature-sensitive soft magnet arranged on the top of the inner shell and heat-conductingly connected to the heat-conducting cover, a hard magnet arranged in the inner cavity of the inner shell, a spring arranged between the temperature-sensitive soft magnet and the hard magnet, a connection circuit fixedly arranged in the inner cavity of the outer shell, and a moving contact piece for connecting or disconnecting the connection circuit; the hard magnet comprises a base and a boss arranged on the base, and the moving contact piece is sleeved on the boss; the hard magnet is located below the temperature-sensitive soft magnet, and when the temperature-sensitive soft magnet and the hard magnet are magnetically attracted, the spring force is overcome to connect the connection circuit to the moving contact piece; when the temperature-sensitive soft magnet loses its magnetism, the moving contact piece is disconnected from the connection circuit. , the spring pushes the hard magnet away from the temperature-sensitive soft magnet to disconnect the dynamic contact piece from the circuit; the dynamic contact piece is in the shape of a ring, and a folded ear is provided on each side of the dynamic contact piece, and a dynamic contact point is provided on each folded ear; the inner ring of the dynamic contact piece is provided with an upwardly bent flange, and the circumference surrounded by the top of these flanges has a diameter smaller than the diameter of the boss; an annular step is provided on the inner wall of the inner shell, and at least two positioning blocks protrude inwardly on the inner wall of the inner shell, and the temperature-sensitive soft magnet includes a temperature-sensing part in contact with the heat-conducting cover and a positioning part arranged under the temperature-sensing part, and a positioning groove adapted to the positioning block is provided on the positioning part, and each positioning block is stuck in the corresponding positioning groove, and the diameter of the temperature-sensing part The diameter of the hard magnet is larger than that of the positioning part, the temperature sensing part is pressed against the top of the inner shell, and the positioning part is pressed against the step; the boss of the hard magnet is installed in the inner ring of the step, and the lower side of the step is provided with two symmetrically arranged limiting protrusions and a plurality of first limiting protrusions arranged at equal angles along the circumferential direction, these limiting protrusions and the first limiting protrusions are all arranged on the inner wall of the inner shell and extend vertically downward, and the base of the hard magnet is provided with a recess adapted to the limiting protrusion; the inner wall of the step is provided with a plurality of second limiting protrusions arranged at equal angles along the circumferential direction; a blind hole for installing a spring is provided at the upper end of the boss, and the top end of the spring is pressed against the bottom surface of the temperature-sensitive soft magnet; the connecting circuit includes A first terminal and a second terminal are fixedly arranged on the housing, and a first static contact piece and a second static contact piece are conductively connected to the first terminal and the second terminal respectively. The free ends of the first static contact piece and the second static contact piece are both provided with static contacts, and the static contacts on the first static contact piece and the second static contact piece face the corresponding moving contacts; the first terminal and the second terminal are plug-in pieces, and two slots are symmetrically provided at the bottom of the housing. The inner ends of the first terminal and the second terminal are inserted into the corresponding slots, and the outer ends of the first terminal and the second terminal respectively extend outside the housing; the first static contact piece and the first terminal are connected and fixed to the housing by rivets, and the second static contact piece and the second terminal are connected and fixed to the housing by rivets.

2. The magnetic sensitive temperature controller according to claim 1, characterized in that: At least two clamping blocks are provided on the outer side wall of the upper end of the inner shell, and corresponding clamping grooves are opened on the inner wall of the outer shell. The inner shell and the outer shell are radially positioned by the clamping blocks and the clamping grooves.

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