Direct-current circuit rapid arc extinguishing thermal protector

Abstract

According to the direct current circuit rapid arc extinguishing thermal protector provided by the utility model, through the arrangement of the temperature sensing alloy, the first elastic member, the flash barrier, the magnet and the yoke, when the temperature sensing alloy senses that the ambient temperature is higher than a set value, the temperature sensing alloy becomes liquid, and at the moment, the first elastic member drives the connecting electrode to be far away from the pin; and the arc between the breakpoints is instantly and rapidly lengthened and snapped, so that the arc is rapidly extinguished. When the connecting electrode is far away from the pin, the connecting electrode loses the limit of the flash barrier, and the second elastic piece jacks the flash barrier upwards and places the flash barrier between the breakpoints, so that the arc is cut off, the voltage breakdown distance between the breakpoints is increased, and the arc extinguishing performance and the voltage resistance of the product are improved. The yoke is magnetized by the magnet so that magnetic fields are superposed and the magnetic field intensity is enhanced; in a magnetic field environment, the electric arc shifts towards a direction far away from a breakpoint under the action of magnetic field force, so that the electric arc is lengthened, the arc resistance is increased, the electric arc energy is reduced, and the purpose of arc quenching is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of thermal protector, specifically, relates to a direct current circuit quick arc extinguishing thermal protector. BACKGROUND

[0002] In low temperature environment, the battery has the disadvantages of reduced chemical reaction rate, increased internal resistance, decreased discharge capacity and power output, reduced charging efficiency, prolonged charging time, even possible failure to charge, frozen electrolyte in the battery, damaged battery structure, and accelerated cycle life and capacity decay rate of the battery; therefore, the battery water heating heater plays an important role in the fields of electric vehicles and energy storage systems, and its main function is to provide a suitable working temperature for the battery to ensure the performance, safety and life of the battery.

[0003] In low temperature environment, in order to enable the battery to quickly reach a benign use condition, the manufacturer will continuously increase the power of the heater to achieve the purpose of quickly heating the battery; at the same time, the related supporting parts also require higher arc resistance; the thermal protector is an over-temperature protection device, and is one of the most important components of the heater; when the heater fails, such as dry burning, the thermal protector will quickly disconnect at a specified temperature point, thereby protecting the surrounding circuit, equipment and personal and property safety;

[0004] At present, the ordinary temperature fuse / thermal protector on the market uses the surface tension provided by the special fat melting state to pull off the connection circuit, but due to the small tension value, the speed of disconnecting the alloy is slow, and the arc resistance of the device under the condition of large voltage and large current in the new energy field cannot meet the requirements. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model aims to provide a direct current circuit quick arc extinguishing thermal protector.

[0006] The utility model adopts the following scheme:

[0007] The utility model provides a direct current circuit quick arc extinguishing thermal protector, which comprises a supporting seat, two pins arranged on the supporting seat and used for connecting with electronic wires, and a connecting electrode and a first elastic member.

[0008] One end of the two pins is welded on the connecting electrode along a first direction through a temperature sensing alloy; the first elastic member is arranged between the supporting seat and the connecting electrode along the first direction; when the temperature sensing alloy senses that the surrounding temperature is higher than a set value, the temperature sensing alloy becomes liquid, and the connecting electrode drives the connecting electrode away from the pins under the elastic force of the first elastic member.

[0009] Further, one end of the pin is provided with a boss, and the connecting electrode is provided with a socket matched with the boss; the boss is inserted into the socket along the first direction and is welded by the temperature sensing alloy.

[0010] Further, the support base is provided with a limiting column, and the other end of the pin is provided with a limiting hole in interference fit with the limiting column.

[0011] Further, a guide rod is further included and connected to the connecting electrode along the first direction; the support base is provided with a first mounting groove; the first elastic member is a spring and is sleeved on the guide rod and abuts against one end surface of the connecting electrode and one end surface of the first mounting groove.

[0012] Further, one end of the guide rod is provided with a protruding part with a limiting step, and the protruding part is provided with a clamping groove; the connecting electrode is provided with a through hole; the limiting step and one end surface of the through hole and an opening check ring clamped on the clamping groove and the other end surface of the through hole form limiting to fix the guide rod.

[0013] Further, a guide rod is further included and connected to the connecting electrode along the first direction; the support base is provided with a first mounting groove; the first elastic member is a spring and is sleeved on the guide rod and abuts against one end surface of the connecting electrode and one end surface of the first mounting groove.

[0014] Further, a guide rod is further included and connected to the connecting electrode along the first direction; the support base is provided with a first mounting groove; the first elastic member is a spring and is sleeved on the guide rod and abuts against one end surface of the connecting electrode and one end surface of the first mounting groove.

[0015] Further, a guide rod is further included and connected to the connecting electrode along the first direction; the support base is provided with a first mounting groove; the first elastic member is a spring and is sleeved on the guide rod and abuts against one end surface of the connecting electrode and one end surface of the first mounting groove.

[0016] By adopting the above technical scheme, the following technical effects can be achieved by the utility model:

[0017] 1. When the temperature sensing alloy senses that the ambient temperature is higher than the set value, the temperature sensing alloy becomes liquid, at this time, the first elastic member drives the connecting electrode to move away from the pin; the electric arc between the breakpoints is instantaneously and rapidly lengthened and broken, so that the electric arc is quickly extinguished.

[0018] 2. The setting of the arc separation plate, when the connecting electrode is away from the pin, the connecting electrode loses the limit of the arc separation plate, the second elastic member will lift the arc separation plate upward, and the arc separation plate is placed between the breaking point, the arc is cut off, and the voltage breakdown distance between the breaking point is increased, the arc extinguishing performance and voltage resistance performance of the product are improved;

[0019] 3. The setting of the magnet and the yoke, the yoke is magnetized by the magnet, so that the magnetic field is superimposed, and the magnetic field strength is strengthened; in the magnetic field environment, the electric arc is deviated to the direction away from the breaking point under the action of the magnetic field force, so that the electric arc is lengthened, the arc resistance is increased, the electric arc energy is reduced, and the arc extinguishing purpose is achieved; and the electric arc will contact the ceramic material shell with high thermal conductivity in the away direction, so that the electric arc is cooled, and the auxiliary arc extinguishing purpose is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 is a disassembly structure schematic view of a direct current circuit rapid arc-extinguishing thermal protector according to an embodiment of the present application;

[0022] Figure 2 is a sectional view and a top view of a direct current circuit rapid arc-extinguishing thermal protector according to an embodiment of the present application;

[0023] Figure 3 is a front view and a side view of a partial assembly view of a pin of a direct current circuit rapid arc-extinguishing thermal protector according to an embodiment of the present application;

[0024] Figure 4 is a top view and a sectional view of A-A of a partial assembly view of a guide rod of a direct current circuit rapid arc-extinguishing thermal protector according to an embodiment of the present application;

[0025] Figure 5 is a schematic view of an internal assembly structure of a direct current circuit rapid arc-extinguishing thermal protector according to an embodiment of the present application, and a top view and a sectional view of B-B;

[0026] Figure 6 is a structure schematic view of a support seat and a magnet and a yoke after assembly of a direct current circuit rapid arc-extinguishing thermal protector according to an embodiment of the present application;

[0027] Figure 7 is a pin structure schematic view of a direct current circuit rapid arc-extinguishing thermal protector according to an embodiment of the present application;

[0028] Figure 8 is a guide rod structure schematic diagram of a direct current circuit fast arc extinguishing thermal protector according to an embodiment of the present application;

[0029] Figure 9 is a connecting electrode structure schematic diagram of a direct current circuit fast arc extinguishing thermal protector according to an embodiment of the present application;

[0030] Figure 10 is a support seat structure schematic diagram of a direct current circuit fast arc extinguishing thermal protector according to an embodiment of the present application;

[0031] Figure 11 is a cover plate structure schematic diagram of a direct current circuit fast arc extinguishing thermal protector according to an embodiment of the present application;

[0032] Figure 12 is a magnetic field arc blowing schematic diagram of a direct current circuit fast arc extinguishing thermal protector according to an embodiment of the present application;

[0033] Icon: shell 1, cover plate 2, electronic wire 3, resin 4, first elastic member 5, pin 6, magnet 7, support seat 8, yoke 9, second elastic member 10, arc separation plate 11, guide rod 12, connecting electrode 13, temperature sensing alloy 14, open blocking ring 15, electronic wire matching hole 201, limiting hole 601, limiting step 602, boss 603, yoke assembly groove 801, magnet assembly groove 803, second installation groove 802, limiting column 804, first installation groove 805, guide hole 806, support step 1201, clamping groove 1202, insertion hole 1301, through hole 1302. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] EMBODIMENT

[0036] In combination with Figures 1 to 12As shown, the embodiment provides a direct current circuit fast arc-extinguishing thermal protector, which comprises a support base 8, two pins 6 arranged on the support base 8 for connecting with an electronic wire 3, and a connecting electrode 13 and a first elastic member 5.

[0037] One end of each of the two pins 6 is welded to the connecting electrode 13 in a first direction through a temperature-sensitive alloy 14; the first elastic member 5 is arranged between the support base 8 and the connecting electrode 13 in the first direction; when the temperature-sensitive alloy 14 senses that the ambient temperature is higher than a set value, the temperature-sensitive alloy 14 becomes liquid, and the connecting electrode 13 is driven away from the pins 6 under the elastic force of the first elastic member 5.

[0038] Specifically, in the embodiment, as shown in Figure 1 , Figure 3 and Figure 7 , one end of the pin 6 is provided with a boss 603, and the connecting electrode 13 is provided with a plug hole 1301 matched with the boss 603; the boss 603 is inserted into the plug hole 1301 in the first direction, is limited by a limiting step 602 at the bottom of the boss 603, and is welded by the temperature-sensitive alloy 14. The welding can be resistance welding, soldering, ultrasonic welding or laser welding. The support base 8 is provided with a limiting column 804, and the other end of the pin 6 is provided with a limiting hole 601 which can be interference-fitted with the limiting column 804. Of course, in other embodiments, the fixing between the pin 6 and the support base 8 can also be connected by buckling.

[0039] In the embodiment, as shown in Figure 1 , Figure 4 and Figure 8 , a guide rod 12 is further included, which is connected to the connecting electrode 13 in the first direction; the support base 8 is provided with a first mounting groove 805, and a wall surface opposite to the connecting electrode 13 of the mounting groove is provided with a first guide hole 806 through which the guide rod 12 passes; the first elastic member 5 is a spring which is sleeved on the guide rod 12 and has two ends abutting against one end surface of the connecting electrode 13 and one end surface of the first mounting groove 805. Specifically, one end of the guide rod 12 is provided with a protruding part having a support step 1201, and the protruding part is provided with a clamping groove 1202; the connecting electrode 13 is provided with a through hole 1302; the limiting step 602 and one end surface of the through hole 1302, and the opening check ring 15 clamped on the clamping groove 1202 and the other end surface of the through hole 1302 form limiting to fix the guide rod 12.

[0040] Through the setting of the temperature sensing alloy 14 and the first elastic member 5, when the temperature sensing alloy 14 senses that the ambient temperature is higher than the set value, the temperature sensing alloy 14 becomes liquid, at this time, the first elastic member 5 drives the connecting electrode 13 to move away from the pin 6; the electric arc between the break point is rapidly elongated and broken, thereby quickly extinguishing the arc.

[0041] In another embodiment, as shown in Figure 1 、 Figure 2 and Figure 5 , it further comprises an arc separation plate 11 and a second elastic member 10; the first elastic member 5 is a spring. The support base 8 is provided with a second installation groove 802 below the connecting electrode 13, and is provided with a second guide hole; the second elastic member 10 is arranged in the second installation groove 802; the arc separation plate 11 is provided with a guide column at the bottom, which is arranged in the second guide hole, and is limited in the second direction by the connecting electrode 13 and the second elastic member 10. After the connecting electrode 13 moves away from the pin 6, the arc separation plate 11 moves to one end of the pin 6 in the second direction under the elastic force of the second elastic member 10, and is arranged between the break points, so as to cut off the electric arc, increase the voltage breakdown distance between the break points, and improve the arc extinguishing performance and voltage resistance performance of the product.

[0042] In other embodiments, as shown in Figure 1 、 Figure 6 and Figure 12 , it further comprises a magnet 7 and two yokes 9 arranged below the connecting electrode 13 on the support base 8; the support base 8 is provided with a magnet assembly groove 803 and a yoke assembly groove 801 for installing the magnet 7 and the yoke 9, and the magnet 7 is arranged in the middle of the support base 8, and the two yokes 9 are arranged on both sides of the magnet 7. The material of the magnet 7 is neodymium iron boron or ferrite.

[0043] The setting of the magnet 7 and the yoke 9 magnetizes the yoke 9 by the magnet 7, so as to superimpose the magnetic field and strengthen the magnetic field strength; in the magnetic field environment, the electric arc is deviated to the direction away from the break point under the action of the magnetic field force, so as to elongate the electric arc, increase the arc resistance, reduce the electric arc energy, and achieve the purpose of extinguishing the arc; and the electric arc will contact the ceramic material shell 1 with high thermal conductivity in the process of moving away, so as to cool the electric arc and achieve the purpose of auxiliary arc extinguishing.

[0044] It should be noted that in the above embodiments, there is also a ceramic material shell 1 with one side opening, and the support base 8 is arranged in the shell 1; the opening is provided with a stepped surface, which is provided with a cover plate 2; the cover plate 2 is provided with an electronic wire matching hole 201 for the electronic wire 3 to pass through; the outside of the cover plate 2 is sealed by the resin 4, so as to realize sealing.

[0045] The preferred embodiments of the utility model are merely above, the protection scope of the utility model is not only limited to the above embodiment, all technical solutions under the utility model idea of belonging to the utility model are the protection scope of the utility model.

[0046] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0047] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0048] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0049] In the utility model, unless otherwise specifically defined and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

Claims

1. A DC circuit fast arc extinguishing thermal protector, comprising a support base (8) and two pins (6) disposed on the support base (8) for connection with an electronic wire (3), characterized in that, It also includes a connecting electrode (13) and a first elastic element (5); One end of each of the two pins (6) is welded to the connecting electrode (13) along the first direction via a temperature-sensitive alloy (14); the first elastic element (5) is disposed between the support base (8) and the connecting electrode (13) along the first direction; when the temperature-sensitive alloy (14) senses that the ambient temperature is higher than a set value, the temperature-sensitive alloy (14) becomes liquid, and the connecting electrode (13) is driven away from the pin (6) by the elastic force of the first elastic element (5).

2. The DC circuit fast arc extinguishing thermal protector according to claim 1, characterized in that, One end of the pin (6) is provided with a boss (603), and the connecting electrode (13) is provided with a socket (1301) adapted to the boss (603); the boss (603) is inserted into the socket (1301) along the first direction and is welded by the temperature-sensitive alloy (14).

3. The DC circuit fast arc extinguishing thermal protector according to claim 2, characterized in that, The support base (8) is provided with a limiting post (804), and the other end of the pin (6) is provided with a limiting hole (601) that can be interference-fitted with the limiting post (804).

4. The DC circuit fast arc extinguishing thermal protector according to claim 1, characterized in that, It also includes a guide rod (12) which is connected to the connecting electrode (13) along the first direction; a first mounting groove (805) is provided on the support base (8); the first elastic element (5) is a spring which is sleeved on the guide rod (12) and its two ends abut against one end face of the connecting electrode (13) and one end face of the first mounting groove (805).

5. The DC circuit fast arc extinguishing thermal protector according to claim 4, characterized in that, One end of the guide rod (12) is provided with a protrusion having a limiting step (602), and the protrusion is provided with a locking groove (1202); the connecting electrode (13) is provided with a through hole (1302); the limiting step (602) and one end face of the through hole (1302), and the opening retaining ring (15) locked on the locking groove (1202) and the other end face of the through hole (1302) form a limiting to fix the guide rod (12).

6. The DC circuit fast arc extinguishing thermal protector according to any one of claims 1-5, characterized in that, It also includes an arc-blocking plate (11) and a second elastic element (10); a second mounting groove (802) is provided on the support base (8) below the connecting electrode (13), and a second guide hole is provided thereon; the second elastic element (10) is provided in the second mounting groove (802); a guide post is provided at the bottom of the arc-blocking plate (11) and is provided in the second guide hole, which limits the second direction through the connecting electrode (13) and the second elastic element (10).

7. The DC circuit fast arc extinguishing thermal protector according to any one of claims 1-5, characterized in that, It also includes a magnet (7) and two yokes (9) disposed on the support base (8) below the connecting electrode (13); the magnet (7) is disposed in the middle of the support base (8), and the two yokes (9) are disposed on both sides of the magnet (7).

8. The DC circuit fast arc extinguishing thermal protector according to claim 1, characterized in that, It also includes a ceramic shell (1) with an opening on one side, and the support base (8) is disposed inside the shell (1); the opening is provided with a cover plate (2), which is provided with an electronic wire mating hole (201) for the electronic wire (3) to pass through; the cover plate (2) is sealed with resin (4) on the outside.

Images