WO2001006601A1

WO2001006601A1 - Rotatable electrical joint, joint holder and cordless electrical applicance

Info

Publication number: WO2001006601A1
Application number: PCT/CN2000/000084
Authority: WO
Inventors: Zhicheng Shao
Original assignee: Zhicheng Shao
Priority date: 1999-07-15
Filing date: 2000-04-10
Publication date: 2001-01-25
Also published as: AU769525B2; CA2378979A1; GB2368980B; GB2368980A; AU4097600A; DE10084812T1; GB0200857D0

Abstract

The invention relates to a rotatable electrical joint, joint holder and cordless electrical applicance. Prior art electrical connectors have not good coupling mechanical strength, electrical contact, security, and cordless electrical appliance have cloggy area when taken away and placed. The invention directs to solve aforementioned questions. Rotating electrical union joint provides annular electrode and side spring contact piece on front end surface and outer surface of cylindric joint. Electrical joint holder provides annular electrode and bottom contact on inner side wall and bottom in cavity, respectively. Cordless electrical appliance provides rotatable electrical joint and joint holder on the bottom of container and base unit, respectively. It provides advantages such as substantial mechanical connection, reliable electrical contact, security, compact structure, and easy to manufacture parts.

Description

Rotating Shenyang car joint, Φ ^^^ ΜΦ ^ π The technical field to which the present invention belongs

The present invention relates to the technical field of cordless electric heating appliances and electric appliance connecting parts thereof, and in particular, it relates to a rotary electric connector, an electric connection base for cordless electric heating, and a cordless electric heating appliance used for a cordless electric kettle and the like.

Prior art prior to the present invention

In Chinese Patent Application No. 9 4 1 9 4 1 7 3, 6, a cordless electrical appliance and a connector are disclosed. The cordless electrical appliance mentioned therein mainly refers to a cordless hot water tank, which includes an electric immersion heater, a tank, a control unit, a base unit for the tank, and an electrical connector provided between the bottom of the tank and the base unit. . Because the immersion heater is used, in order to accommodate the power connector of the immersion heater, the control unit is set on the bottom side of the bottom of the tank. Because the control unit occupies a certain volume, it is bound to add a certain space on the bottom side of the bottom of the tank, resulting in The electrical connection structure at the bottom of the tank is complex.

The connectors used in cordless appliances include a male connector and a female connector. The male connector has only one column terminal provided in the center for power supply, a ring-shaped power terminal concentric with the column terminal, and a ring terminal provided on the inner surface of the male connector for grounding. The female connector is provided with a circular hole and a circular opening for receiving the post terminal and the ring-shaped power terminal. A leaf spring connected to the column terminal of the male connector is provided in the circular hole of the female connector, a leaf spring connected to the ring terminal is provided in the circular opening, and an outer surface of the female connector is provided with a ground connection. The ring terminal is connected to the spring contact. Because the leaf springs in the round hole and the ring-shaped opening are connected to the power supply, neither of these holes can be designed too large to prevent fingers from touching the leaf spring and getting an electric shock, so the diameter of the post terminal is limited. The design is too thick, and it has good performance in terms of conduction and electrical connection, but the diameter of the round hole is too large, which is easy to get an electric shock. The design is too thin, on the one hand, it makes the connection and fabrication of the post terminal and the conductive sheet difficult, and the tightness of the connection between the two directly affects the effective transmission of power. One of the ring terminals is between the other ring terminal and the column terminal. Only one end is fixed to the male connector. There is no other reliance. The fixation is not stable. Frequent plugging is easy to cause loosening, which affects the power transmission. It is difficult to connect the male and female connectors. On the other hand, the contact surface of the post terminal and the female connector is small, and the surface is slightly oxidized, which will seriously affect the electrical contact. If the connection is a little loose, heat will be generated after the power is turned on, and severe ignition will occur. Oxidation will occur between the connections, which will increase the resistance and cause severe heat, which will cause a vicious cycle and burn the plastic housing of the electrical connector. . If the contact clamps the electrodes too tightly, the male and female connectors are not easy to separate, it is easy to stick tape, and too loose electrical connection is ineffective.

Purpose of this month The object of the present invention is to provide a rotary electrical connector for cordless electric heating appliances, which can be connected in any direction, has a stable connection, reliable electrical connection, and good electrical safety.

An object of the present invention is also to provide an electric connection base for a cordless electric heating device, which is convenient for rotating a rotary electrical connector, has a stable connection, a reliable electrical connection, and has good electrical safety.

The object of the present invention is also to provide a cordless electric heating appliance which is convenient to be placed at any angle, can be rotated, has a stable connection, has reliable electrical connection, and has good electrical safety.

Technical solution of the present invention

In order to achieve the first object of the present invention, the rotary electrical connector includes a columnar joint, and a ring-shaped electrode piece and a side spring contact connected to a power terminal of the connector are respectively provided on a head end surface and an outer surface of the columnar joint. sheet.

In order to achieve the second object of the present invention, the electrical connection base capable of receiving the rotary electrical connection head includes a cavity capable of accommodating the connection head, and an inner wall and a bottom of the cavity are respectively provided with and seats. The ring electrode and the bottom contact connected to the power terminal.

In order to achieve the third object of the present invention, the cordless electric heating appliance includes a container, a base for placing the container, a base at the bottom of the container, a rotary electrical connector in the base, and a correspondingly provided on the base. The electric connection base is provided with a ring electrode sheet and a side elastic contact piece connected to the power terminal of the connector on the head end surface and the outer surface of the cylindrical joint of the rotary electric connection head, respectively. A cavity, and a ring electrode and a bottom contact connected to a power terminal of the seat are respectively provided on the inner wall and the bottom of the cavity.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings are illustrated as follows:

Figure 1 is a structural view of a rotary electrical connector.

FIG. 2 is a top view of FIG. 1.

FIG. 3 is a bottom view of FIG. 1.

FIG. 4 is a structural view of the electrical connection base.

FIG. 5 is a top view of FIG. 4.

FIG. 6 is a bottom view of FIG. 4.

FIG. 7 is a structural view of the rotary electrical connector of FIG. 1 and the electrical connector of FIG. 4 being plugged together.

Fig. 8 is another structural view of the rotary electrical connector.

FIG. 9 is a top view of FIG. 8.

FIG. 10 is a structural view of the rotary electrical connector of FIG. 8 and the electrical connection base of FIG. 4. FIG. 11 is a partial state view of the dry-fired ejector lever in FIG. 10 pushing down the side elastic contact piece downward.

FIG. 12 is a partial state diagram of the over-temperature fused ejector lever in FIG. 10 pushing up the side spring contact piece upward.

FIG. 13 is a partial cross-sectional view taken along the line A in FIG. 12.

Views of the stamped structure of the ring-shaped electrode pads in FIGS. 14 and 7.

Figure 15 is a structural view of a cordless electric heating appliance.

Examples

The embodiments of the cordless electric heating appliance, the rotary electric connector and the electric connection base of the present invention will be further described in detail with reference to the accompanying drawings:

As shown in FIGS. 1, 2, and 3, the rotary electrical connector according to this embodiment includes a plastic part having a cylindrical joint 1 injection-molded from plastic, and a copper sheet is provided on a head end surface of the cylindrical joint 1.成的圆状状片 6。 Ring-shaped electrode sheet 6. The ring-shaped electrode sheet 6 is provided with a folded fin 3 3 connected to the power terminal 5 thereof, and as shown in FIG. 14, the folded fin 33 and the ring-shaped electrode sheet 6 are metal pieces of integral structure. On the end surface of the columnar joint 1 are provided three fixing holes 8 through which the fins 33 can pass. The fins 33 pass through the fixing holes 8 and are bent, and are buckled in the plastic part of the cylindrical joint 1. The ring-shaped electrode sheet 6 can be firmly fixed on the head end surface of the columnar terminal 1. The connector is provided with a copper power terminal 5 connected to the power line, the power terminal 5 is made of copper sheet, the fins 3 3 and the copper power terminal 5 are electrically connected by welding, and the welding point is at the cylindrical joint 1 In the interlayer, this connection is firm and reliable. A side elastic contact piece 7 is provided on the outer surface of the columnar joint 1. The exposed portion of the columnar joint 1 is in an arc shape, which is convenient for pushing in from the side wall of the columnar joint. The side elastic contact piece 7 and the other power terminal 5 of the electrical connector are Monolithic structure made of copper sheet. The arc-shaped side elastic contact piece 7 has good elasticity.

In many electrical appliances, from the perspective of electrical safety, it is necessary to provide a ground connection, so a jack 2 can be provided in the center of the columnar joint 1, and a ground spring contact piece 4 is provided in the jack 2 to ground the spring. The contact piece 4 and the ground connection terminal 3 of the electrical connection head are an integral structure made of a copper sheet, and also have good elasticity.

In cordless electric heating appliances, considering that the temperature of the heating element rises to a certain temperature, the power supply needs to be turned off to ensure that the temperature does not increase continuously, causing the electrical appliance to burn out. For example, in an electric kettle, when the water in the kettle body is burned dry, the temperature of the entire kettle body continues to rise, which requires a dry burn protection. As shown in FIGS. 8 and 9, in order to achieve dry-burn protection, this rotary electrical connector includes a columnar connector 1, and a ring connected to the power terminal 5 of the connector is provided on the head end surface and the outer surface of the columnar connector 1, respectively. The electrode electrode 6 and the side elastic contact piece 7 are provided in the columnar joint 1 with a dry-fired ejector rod 35 extending along the tail end surface 39 of the columnar joint 1 and capable of jacking up the side elastic contact piece 7. The side elastic contact piece 7 is provided with a frame fin 40 that can be jacked up by the dry-fired ejector pin 35, and the top of the dry-fired ejector pin 3 5 has an oblique wedge shape to facilitate the lifting of the frame fin 40. There is a ring-shaped middle at the tail end face 3 of the columnar joint 1 O 01/06601 The thermo-actuating actuating piece 3 6 with a tongue is pushed on the end of the dry-fired ejector pin 3 5. The temperature-sensitive actuating sheet may be a temperature-sensitive bimetal sheet. As shown in Figures 10, 11, 1, 2, and 13, when the water in the kettle body is burned out, the temperature at the bottom of the kettle body rises, and the temperature-sensitive actuating piece acts to push the dry burner ejector down. The oblique wedge-shaped top head lifts the frame fin 40 to the right, and the exposed portion of the side-shaped elastic contact piece 7 in a circular arc shape is retracted into the columnar joint, and the power is turned off to stop heating and play a role of dry burning protection. . When water is re-added in the pot body container, the temperature at the bottom of the pot body container is lowered, and the temperature-sensitive actuating piece is restored. The tongue piece pulls up the thousand-burning top rod, and the side elastic contact piece pops out, which can also make the power supply. Switched on and repeatable. The tail end surface 39 is formed by a metal cover, and a hole is provided in the middle of the metal cover, so that the temperature-sensitive actuating piece 36 is exposed on the tail end surface 39 of the columnar joint 1 so as to be in contact with a heating body that needs to be induced. The metal cover is not afraid of deformation due to high temperature, and is installed on the end surface 39 of the columnar joint 1, so that the rotary electrical connector can be directly placed on the surface of the heating element, and the heat generated by the heating element will not be directly added to the plastic part, but through the metal. The cover edge of the cover is transmitted to the plastic part, thereby greatly reducing the heat added to the plastic part, and avoiding the plastic part from melting due to the high temperature.

In practical use, due to various reasons, the thermal insulation control, dry-burn protection will fail, and the heating element in the electric heating device will be continuously heated. In order to prevent the electric heating device from being burned and causing an uncontrollable fire, an over-temperature fuse ejector pin 3 7 is provided in the columnar joint 1 along the trailing end surface 39 of the columnar joint 1 and can hook up the side spring contact sheet 7. The bottom of the over-temperature fusible ejector pin 3 7 in the joint 1 is provided with an over-temperature disconnect spring 38 which can be pushed up. The side elastic contact piece 7 is provided with a frame fin 40 that can be jacked up by an over-temperature fusing ejector pin 37. The over-temperature fusible ejection rod 37 is L-shaped, and an oblique wedge is placed on the frame fin 40 at an inverted position. When the upper end of the over-temperature fusible ejection rod is melted, the entire over-temperature fusible ejection rod is lifted upward by the over-temperature disconnecting spring below it, and its barb wedge permanently pushes the side spring contact piece inward, The power supply will often run out until repaired.

As shown in FIGS. 4, 5 and 6, an electrical connection base capable of receiving the foregoing rotary electrical connector includes a cavity 9 capable of accommodating the connector, and an inner wall and a bottom of the cavity 9 are respectively provided with a cavity. The power supply terminal 1 2 of the base is connected to the ring electrode 13 and the bottom contact 1 4. In order to facilitate cooperation with the aforementioned rotary electrical connector that needs to be grounded, a central conductive post 10 connected to the ground terminal 11 of the seat is provided in the center of the cavity 9. The central conductive post 10 is provided with a cover 16 for sealing the cavity opening and a spring 15 for resetting the cover 16. The central conductive post 10 is provided with a guide groove 17, and the cover 16 is correspondingly provided with a positioning convex card 18 locked in the guide groove 17 and a through hole 1 through which the bottom contact 14 can be exposed. 9. The mouth 9 of the recessed cavity 9 is provided with a ring-shaped inclined surface guide hook 20 which is convenient for the connector to enter and can block the sliding of the cover 16. The central conductive post 10 is closest to the seat of the cavity opening surface, the ring electrode 13 is centered, and the bottom contact 14 is farthest. As shown in FIG. 7, when the rotary electrical connector is inserted, the central conductive post 10 first contacts the ground spring contact 4 so that the electrical appliance Safely ground, then the ring electrode 13 is in contact with the side elastic contact piece 7, that is, one of the power sources is turned on, and the contact will not generate a contact spark at this time. The contact portion of the side elastic contact piece 7 may be a common copper contact. It is the bottom contact 14 that is in contact with the ring-shaped electrode sheet 6, and the contact spark at this time is the largest. A silver contact may be provided on the bottom contact.

As shown in FIG. 15, a cordless electric heating appliance includes a container 21 for holding water, a base 22 for placing the container, a base 2 3 is provided at the bottom of the container 21, and a rotation is provided in the base 23 The electrical connector 24 is provided with an electrical connector 25 on the base 22, and the end surface and the outer surface of the columnar joint 1 of the rotary electrical connector 24 are respectively provided with a power terminal 5 connected to the connector. The annular electrode sheet 6 and the side elastic contact sheet 7, the electrical connection seat 25 is provided with a cavity 9 capable of accommodating the columnar connector 1, and the inner wall and the bottom of the cavity 9 are respectively provided with a power supply terminal 1 of the seat. Connected ring electrode 1 3 and bottom contact 1 4. A jack 2 is provided in the center of the columnar joint 1, and a ground spring contact piece 4 connected to the ground connection terminal 3 of the connector is provided in the jack 2. A center is provided in the center of the cavity 9. There is a central conductive post 10 connected to the ground terminal 11 of the base. The central conductive post 10 is provided with a cover 16 for sealing the cavity opening and a spring 15 for returning the cover 16. The rotary electrical connector provided in the base 23 may be any one of the structural electrical connectors described above. The electrical connection base 25 provided on the base 22 may also be any type of electrical connection base described above. When the power cord on the base is connected to the power supply, the ring electrode and the bottom contact of the electrical connection base are charged. Because the cover is blocked on the cavity opening, only the central conductive pillar is exposed outside, and the central conductive pillar is grounded, so that the entire There are no live parts on the surface of the electrical connector, and the electrical appliance has good safety performance. In the process of placing the container on the base, first, the rotary electrical connector at the bottom of the container is in contact with the electrical connection seat provided on the base. The inclined guide hook at the mouth of the cavity is easy to insert into the cavity. The central conductive post 10 is provided with a guide groove 17, and the cover 16 is correspondingly provided with a positioning convex card 18 locked in the guide groove 17 and a through hole 19 through which the bottom contact 14 can be exposed. The central conductive post 10 is provided with a guide groove 17, and the cover 16 is correspondingly provided with a positioning convex card 18 caught in the guide groove 17 and a through hole 19 through which the bottom contact 14 can be exposed. The front end surface of the entire columnar joint is in contact with the cover. Because the convex card is embedded in the guide groove, the cover will be positioned and pressed down smoothly, so that the bottom contact can be aligned with the through hole without misalignment. During this process, The central conductive post 10 first contacts the ground spring contact 4 so that the electric kettle is safely grounded, then the ring electrode 13 contacts the side spring contact 7, and finally the bottom contact 14 contacts the ring electrode 6. Only then does a spark of contact occur at the bottom. Because the silver contacts on the bottom are in contact with the ring-shaped electrode, the silver contacts have good oxidation resistance, and the ring-shaped electrode has a large contact surface. Even if local oxidation occurs, as long as the container is slightly rotated, the oxidation will be staggered. Point, both will have good electrical contact. When the container is removed from the base, the cover is lifted up by the return spring on the central conductive post, on the one hand, the rotary electrical connector and the electrical connector are quickly separated, avoiding the contact between the two due to the spring. The clamp is too tight, and the electrical contact is reliable, but the container will hold the base when separated Entrainment, and the contact clip is too loose, the contradiction of poor electrical contact. When the container leaves the base, the cover closes the cavity opening to keep the appliance safe and avoid touching the electrodes with your fingers. The lower cover surface 2 6 is provided with a fixing post 2 8, a fixing post 2 8 with a jacket spring 2 9, and a fixing ear 4 on the rotating electrical connector 2 4 is positioned on the fixing post 2 8 by a fastener 30. So that the rotary electrical connector is elastically fixed on the lower cover surface 26 of the base 23. Since the cylindrical joint at the bottom of the container must be aligned with the electrical connection seat on the base, the temperature-sensitive actuating piece and the fuse ejector rod on the back of the rotating electrical connector must also be attached to the bottom surface of the container. The lower cover face is mounted on the base, the rotary electrical connector is mounted on the lower cover face, and finally the lower cover face is fixed on the bottom of the container. When the trailing end surface 39 of the rotating electrical connector 24 is pushed to the bottom of the container, the spring is compressed, and there is a gap 3 2 between the rotating electrical connector 24 and the end 31 of the fastener 30, which is convenient for adjusting the installation gap. . At this time, the temperature-sensing actuating piece 36 and the over-temperature fusible ejection pin 37 are pushed on the bottom of the container. During use, under normal circumstances, when the water in the container is boiled, since the steam passes through the thermostat 41 provided on the container 21 to make it operate, the electric heater of the container bottom portion 34 is turned off. When the water in the container is burned out or the water is not contained in the container, the temperature at the bottom of the container will rise rapidly. At this time, because the temperature controller does not sense the water vapor, the power cannot be controlled to disconnect, and the temperature-sensitive actuator It will sense the rising temperature at the bottom of the container to act, and drive the dry burner ejector to disconnect the power supply between the rotating electrical connector and the electrical connector. After pouring water into the container, the temperature-sensitive actuator is reset, and the power supply between the rotary electrical connector and the electrical connection base is turned on. This is a dry burning protection device. If the dry burning protection device fails, the temperature at the bottom of the container will continue to rise until the top of the fuse ejection rod is melted, and the over-temperature fuse spring will push the fuse ejection rod upward; the power supply between the rotary electrical connector and the electrical connector is also cut off. On, this over-temperature protection device cannot be restored, thereby effectively preventing a fire. The rotating electrical connector and the electrical connector described above can also be used in electric heating appliances such as cordless irons, which will not be repeated here.

Positive effects of the present invention compared with the prior art

In summary, compared with the prior art, the present invention:

The rotary electrical connector uses a ring electrode pad and a side spring contact pad structure on the columnar joint. The electrode has a large ring surface area, a flat surface, and a large contact surface. The mechanical connection is firm and the electrical contact is reliable. Side spring contact piece The side is equipped with high temperature protection devices such as over-temperature fuse ejector and fuse ejector. It has the advantages of good safety protection performance, compact structure, simple parts processing and overall assembly.

The electric connection base adopts a ring electrode and a bottom contact which are respectively connected to the power terminal of the base on the inner side wall and the bottom of the cavity that receives the connector. It has complementary docking with the large and small electrodes of the rotating electrical connector, reliable electrical contact, firm mechanical connection, and a reset cover on the central conductive post, which prevents fingers from getting an electric shock and has good electrical safety.

The cordless electric heating appliance adopts a base at the bottom of the container, and a rotary electric connector is arranged in the base. An electrical connection base should be provided, and the rotary electrical connection head is elastically fixed on the lower cover surface of the base. The container can be placed on the base in any direction, the electrical connection between the two is reliable, the mechanical connection is firm, easy to put in place, easy to remove, the electrical safety is good, the heating protection function is perfect, the assembly is easy and simple advantage.

Claims

01/06601 claim

1. A rotary electrical connector, comprising a cylindrical connector (1), characterized in that a ring-shaped electrode sheet connected to a power terminal (5) of the connector is respectively provided on a head end surface and an outer surface of the cylindrical connector (1). (6) and side spring contacts (7).

2. The rotary electrical connector according to claim 1, characterized in that a center (2) is provided in the center of the columnar joint (1), and a connector is provided in the (2). The ground wire connection terminal (3) is connected to the ground spring contact piece (4).

The rotary electrical connector according to claim 1 or 2, characterized in that the ring-shaped electrode sheet (6) is provided with a folded fin (3 3) connected to a power terminal (5).

The rotary electrical connector according to claim 3, characterized in that the folded fin (33) and the ring-shaped electrode sheet (6) are metal pieces of integral structure.

The rotary electrical connector according to claim 4, characterized in that a fixed hole (8) through which a folded fin (3 3) can be inserted is provided on an end surface of the columnar joint (1).

6. The rotary electrical connector according to claim 1 or 2, characterized in that a cylindrical end (1) is provided with a tail end surface (39) extending to the cylindrical end (1) and a side spring contact piece (1) 7) Dry burned ejector

(3 5), the tail end face (3 9) of the columnar joint (1) has a temperature-sensitive actuating piece (3 6) on the end of the burning rod (3 5).

7. The rotary electrical connector according to claim 6, characterized in that the tail end surface (39) is formed of a metal cover.

8. The rotary electrical connector according to claim 6 or 7, characterized in that the side elastic contact piece (7) is provided with a frame fin (4 0) which can be jacked up by a dry-burning jack (3 5). ).

9. The rotary electrical connector according to claim 1 or 2, characterized in that a cylindrical end (1) is provided with a tail end surface (39) extending to the cylindrical end (1), and a side elastic contact piece (1) can be hooked 7) The over-temperature fusible ejection rod (3 7), in the columnar pressing head (1), the over-temperature fusible ejection rod (3 7) is provided with an over-temperature disconnection spring (3 8) which can be popped up.

10. The rotary electrical connector according to claim 9, wherein the tail end surface (39) is formed of a metal cover.

1 1. The rotary electrical connector according to claim 9 or 10, characterized in that the side elastic contact piece (7) is provided with a frame fin which can be jacked up by an over-temperature fuse ejection rod (3 7). (4 0). 01/06601

1 2. An electrical connection base capable of receiving a rotary electrical connector, comprising a recessed cavity (9) capable of accommodating the connection head, characterized in that an inner wall and a bottom of the recessed cavity (9) are respectively provided with an AND seat. The power terminal (1 2) is connected to the ring electrode (1 3) and the bottom contact (1 4).

The electrical connection base according to claim 12, characterized in that a central conductive post (1 0) connected to the ground terminal (1 1) of the base is provided in the center of the cavity (9).

1 4. The electrical connection base according to claim 13, wherein the central conductive post (10) is provided with a cover (1 6) capable of sealing the cavity opening and a cover ( 1 6) The return spring (1 5).

1 5. The electrical connection base according to claim 14, wherein the central conductive post (10) is provided with a guide groove (17), and the cover (16) is correspondingly provided with a clip. The positioning protrusion (1 8) in the guide groove (1 7) and the through hole (1 9) that can expose the bottom contact (1 4).

1 6. The electrical connection base according to claim 1 4 or 15, characterized in that the mouth of the cavity (9) is provided with a connector that is convenient to enter and can block the cover (1 6) Slide out the bevel guide hook (2 0).

1 7. The electrical connection base according to claim 1, 3, 14 or 15, characterized in that the central conductive pillar (1 0) is closest to the seat of the cavity opening surface, and the ring electrode (1 3) is centered The bottom contact (1 4) is the farthest.

1 8. A cordless electric heating appliance, including a container (2 1), a base (2 2) for placing the container, a base (2 3) at the bottom of the container (2 1), and a base (2 3) A rotary electric connector (24) is provided, and an electric connector (2 5) is correspondingly provided on the base (2 2), which is characterized in that the head end face and the outer surface of the columnar joint (1) of the rotary electric connector are provided respectively. There are a ring electrode piece (6) and a side spring contact piece (7) connected to the power terminal (5) of the connector, and the electrical connection base (2 5) has a cavity (9) capable of receiving the columnar connector (1). The inner wall and the bottom of the cavity (9) are respectively provided with a ring electrode (1 3) and a bottom contact (1 4) connected to the power terminal (1 2) of the seat.

1 9- The cordless electric heating appliance according to claim 18, characterized in that the center of the columnar joint (1) is provided with a jack (2), and a connection is provided in the jack (2) The ground wire connection terminal (3) of the head is connected to the ground spring contact piece (4), and a central conductive post (1 0) connected to the ground terminal (1 1) of the seat is provided in the center of the cavity (9).

2 0. The cordless electric heating appliance according to claim 18 or 19, characterized in that the rotary electrical connector is elastically fixed on the lower cover surface (2 6) of the base (2 3), and the lower cover surface (2 6) is fixed on the bottom (27) of the container (2 1).

2 1. The cordless electric heating appliance according to claim 20, characterized in that the lower cover surface 01/06601

(2 6) is provided with a fixing post (2 8), the fixing post (2 8) coats a spring (2 9), and the rotating electrical connector (24) is positioned on the fixing post (30) by a fastener (3 0) 2 8), when the rotating electrical connector (2 4) compresses the spring, there is a gap between the rotating electrical connector (2 4) and the end (3 1) of the fastener (30)

(3 2).

2 2. The cordless electric heating appliance according to claim 21, characterized in that the columnar joint (1) is provided with a tail end surface (3 9) extending to the columnar joint (1) and can lift the side elastic contact piece (7) ) Of the dry-burnt ejector (3 5), the end of the cylindrical joint (1) has a temperature-sensitive actuator (3 6) at the end of the burner (3 5).

2 3. The rotary electrical connector according to claim 21, characterized in that a tail end (3 9) extending to the column joint (1) is provided in the column joint (1), and a side spring contact piece (3) can be hooked 7) The over-temperature fusible ejection rod (3 7), in the columnar joint (1), the over-temperature fusible ejection rod (3 7) is provided with an over-temperature disconnection spring (3 8) which can be popped up.