JP4353166B2 - Plug receiving device for electrical equipment - Google Patents

Description

  The present invention relates to a plug receiving device in an electric device such as a rice cooker, an electric kettle, or a pottery cooker.

  Conventionally, this type of plug receiving device for electrical equipment has been designed to simplify wiring to the plug receiving device in the main body by being mounted on a control circuit unit that controls energization of the heating element (for example, , See Patent Document 1).

In addition, in order to shorten the amount protruding from the plug receiving device in the main body to the inside of the main body, a structure in which a connection terminal is provided at the tip of the lead wire is fixed in a direction orthogonal to the electrode pin (for example, a patent Reference 2).
JP-A-5-15450 JP 2005-130933 A

  However, according to the above connection structure, since the lead wire wired to the plug receiving device is fixed to the plug receiving device, there is a problem that it is difficult to handle when assembling and disassembling the plug receiving device.

  In recent years, in the case of configuring an electric water heater with good heat insulation performance, since the heat insulating material covering the inner container is extended to the bottom near the bottom of the main body, the plug receiving device does not protrude outward from the main body. In order not to impair the external shape and to prevent the main body body diameter from being enlarged, the plug receiving device and the electrical connection configuration must be thinned and stored in the space between the heat insulating material and the main body body (side surface). I had a problem that I had to.

  The present invention solves the above-mentioned conventional problems, and improves the handling of the plug receiving device, reduces the amount of protrusion to the inside of the main body, and eliminates the influence on the internal structure and appearance shape of the main body. The purpose is to provide.

In order to solve the above-described conventional problems, a plug receiving device according to the present invention includes a terminal block having a pair of electrode pins fixed to a terminal that joins a connection terminal in an upward direction of the main body, and an electric component inside the terminal. An insulating sheet provided with the connecting terminal provided at the tip of a lead wire connected to the terminal, a cylindrical part covering the connection between the terminal and the connecting terminal, and a flat part covering up to a fixing part of the electrode pin of the terminal; An abutting portion that abuts on the connecting side of the insulating sheet cylindrical portion and the flat surface portion installed on a terminal block, and an engaging protrusion having a retaining member after passing through a hole provided in the insulating sheet flat surface portion and passing once. And is configured to be positioned in the penetration direction after passing through the terminal and the connection terminal, and is arranged and fixed from below the main body.

As a result, the lead wire connected to the internal electrical component can be attached to and detached from the plug receiving device, and handling when the plug receiving device is assembled and disassembled is facilitated. In addition, the terminal block having a pair of electrode pins arranged and fixed in a direction orthogonal to the terminal facing the upper side of the main body is disposed from the lower side, thereby eliminating the influence on the internal structure and appearance of the main body. is there. Furthermore, it is possible to easily assemble and disassemble the plug receiving device to the main body. Furthermore, insulation from the internal structure can be ensured. Furthermore, the insulating sheet can be easily fixed to the terminal block.

  The plug receiving device of the present invention eliminates the influence on the internal structure and appearance of the main body, and the connection terminal provided at the tip of the lead wire can be freely attached to and detached from the terminal provided on the terminal block. It is easy to assemble and disassemble the receiving device.

The first invention is a terminal block having a pair of electrode pins fixed to a terminal that joins a connection terminal facing upward on the main body, and the connection provided at the tip of a lead wire connected to an electrical component inside the terminal. A terminal, a cylindrical portion that covers the connection between the terminal and the connection terminal, and an electrode pin fixing portion of the terminal.
An insulating sheet provided with a flat portion covering the surface, a contact portion contacting the connecting side of the insulating sheet cylindrical portion and the flat portion installed on the terminal block, and a hole provided in the flat portion of the insulating sheet And an engaging protrusion having a retaining member after passing once, and is configured to allow the terminal and the connection terminal to pass through and then be positioned in the penetrating direction, and is arranged from below the main body. By fixing, it is possible to eliminate the influence on the internal structure and appearance of the main body, and to easily assemble and disassemble the plug receiving device to the main body.

Furthermore , insulation from the internal structure can be ensured.

Furthermore , the insulating sheet can be easily fixed to the terminal block.

The second invention can provide an insulating sheet that is easy to assemble and inexpensive by processing one end of the insulating sheet punched into a substantially T shape into a cylindrical shape.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is an example of an electric water heater provided with a plug receiving device according to Embodiment 1 of the present invention. This electric water heater accommodates an inner container 2 (see FIG. 2) for containing a bottomed cylindrical object (water) having a heating means (not shown) inside the main body 1 and opens and closes the lid 3. It is attached freely. The main body 1 includes a body 4 and an upper frame 5 provided at an upper end portion thereof. A plug receiving device 6 is attached near the lower end of the rear surface of the body 4. A nose portion 7 is provided at the front end of the upper frame 5, and an operation portion 8 is provided at the nose portion 7. A discharge port opening 9 is provided in the body 4 below the nose portion 7, and the lid 3 is attached via a hinge 10 (see FIG. 3) on the opposite side of the nose portion 7. Both ends of the handle 11 formed in a semi-annular shape are rotatably attached to both side surfaces of the body 4. The plug 12 on the side of the power cord 13 includes a pair of male electrode pins 14 and a pair of female electrode pins (not shown) and a magnet piece (not shown) corresponding to a pair of male electrode pins 14 and a magnetic piece 15 of the plug receiving device 6 described later. ) Is provided. A terminal 17 (see FIG. 4) is fixed to the male electrode pin 14 (see FIG. 4) by caulking through a terminal block 16 (see FIG. 4). They are connected by a connection terminal 19 (see FIG. 2) such as a Faston terminal provided at the tip of a lead wire 18 (see FIG. 2) for supplying power to the means, control circuit board and the like. By attaching the plug 12 to the plug receiving device 6 and inserting the power plug 16 into a commercial power source, power is supplied to the internal heating means, the control circuit board, and the like.

  FIG. 2 is an exploded perspective view of the electric water heater as viewed from the front in a state where the electric water heater is turned upside down. In addition to the body 4, the upper frame 5, the inner container 2, a cylindrical heat insulation located on the outer peripheral portion of the inner container 2. The electric signal of the sensor unit 25 which consists of temperature sensitive elements, such as the material 20, the baseplate 21 which obstruct | occludes opening of the bottom face of the body 4, the pump 22 with which the bottom face of the inner container 2 was mounted | worn, the water level pipe | tube 23, the discharge outlet 24, and a thermistor. The control board box 26 etc. which accommodated the control circuit board which controls the temperature of the to-be-contained object in the inner container 2 are shown.

  The structure of the heat insulating material 20 is not particularly limited, but in the present embodiment, the heat insulating material 20 is a vacuum heat insulating material. This is fumed silica, pearlite, etc. stored in an outer bag made of a resin film having gas barrier properties, a resin / metal foil laminate film (for example, nylon, PET, aluminum foil, unstretched polypropylene), etc. Inorganic powders or inorganic fibers such as glass wool, core materials such as rigid urethane foam and foamed phenol resin are filled, and the inside is decompressed and sealed. Since the vacuum heat insulating material 20 is usually a flat plate, it is processed into a cylindrical shape using a three-roller or the like in order to be able to be mounted on the inner container 2.

  Further, a convection preventing member 28 is disposed in a notch 27 for connecting the pump 22 and the water pipe 23. Here, foamed melamine or the like is used as the convection preventing member 28, but any heat insulating material having heat resistance of 100 ° C. or higher may be used.

  The body 4 is attached to the leg metal fittings 29 a and 29 b provided at the bottom of the inner container 2 with a set screw 30. The bottom plate 21 is fixed to the bottom surface of the body 4 with screws 31.

  FIG. 3 is an exploded perspective view of the electric water heater as viewed from the rear in a state where the electric water heater is turned upside down. The plug receiving device 6 described above is joined to a terminal 17 provided in the post-operative plug receiving device 6 after the lead wire 18 provided with the connection terminal 19 at the tip is passed through the insulating sheet 32. After the plug receiving device 6 is joined to the connection terminal 19 and the terminal 17, the plug receiving device 6 is attached to the body 4 of the main body 1 and is fixed to the body 4 by a fixing screw 33.

  As shown in FIGS. 4A to 4F, the plug receiving device 6 includes a terminal block 16 formed of a heat-resistant synthetic resin such as a phenol resin, a pair of left and right electrode pins 34, and a magnetic body. It consists of a piece 15. The terminal block 16 is formed with a fitting portion 36 having a square frame-shaped guide wall 35 on the front surface, and the outer end portions of the pair of electrode pins 34 protrude from the fitting portion 36. The inner end side of each electrode pin 34 protrudes slightly on the back surface of the terminal block 16, and the terminal 17 that joins the connection terminal 19 to the upper side of the main body 1 passes through the terminal through hole 17 a to the electrode pin 34, and the caulking portion 37 is formed. By providing, the terminal 17 is fixed to the electrode pin 34. The terminal 17 and the electrode pin 34 can be set at an angle where the caulking process can be performed, but in the present embodiment, the terminal 17 and the electrode pin 34 are set so as to cross at a right angle.

  A protective rib 41 is provided around the caulking portion 37 so that the caulking portion does not protrude. The terminal 17 is crank-bent on the side of the terminal block 16 where the main body 1 is attached. Reference numeral 38 denotes a self-tapping hole to which the fixing screw 33 is tightened. In the vicinity of the hole 38, a protrusion 39 is arranged in which the tip end side with a width Y is constricted with the width X. The dimension of the protrusion 39 is set so that d <X <Y with respect to the hole diameter d of the hole 38. The mating surface 40 on which the fixing screw 33 is provided is a flat surface. Reference numeral 42 denotes a contact surface for positioning the insulating sheet 32 in the vertical direction. On the contact surface 42, guide ribs 43 of the insulating sheet 32, which will be described in detail later, are provided. 45 is a cover part when it is attached to the body 4, and 44 is an engaging claw provided on both side surfaces of the terminal block.

  FIG. 5 is a detailed perspective view of the plug receiving device 6 in the vicinity of the lower end of the rear surface of the body 4 as seen from the outside before the attachment, and FIG. 6A is a detailed perspective view of the state in which the plug receiving device 6 is removed as seen from the inside. FIG.6 (b) has shown the detailed perspective view which looked at the attachment state of the plug receiving apparatus from the inner side. 5 and 6 illustrate the mounting structure of the plug receiving device 6 to the body 4, and members other than the body 4 and the plug receiving device 6 are not shown.

  The mounting hole 47 provided on the surface of the stepped portion 46 which is substantially similar to the outer shape of the cover portion 45 of the terminal block 16 provided on the body 4 has a step so as not to face the upper end side matching portion 48 with the plug receiving device 6. The lower mating surface 49 is formed. On the lower mating surface 49 side, a screw housing part 51 having a hole 50 for fixing the plug receiving device 6 through the fixing screw 33, and for confirming the presence or absence of the insulating sheet 32 after the assembly is completed. A confirmation window 52 is provided.

  When the cover 45 of the terminal block 16 is engaged with the step 46 provided on the body 4, the plug receiving device 6 is provided with elastic locking pieces 53 provided inwardly on the left and right side edges of the mounting hole 47. However, the engaging claw 44 provided on the terminal block 16 is set so as to be hooked.

  FIG. 7 is a detailed view of the insulating sheet 32, FIG. 8 is a view showing details of auxiliary processing for stabilizing the shape of the insulating sheet, and FIG. 9 is a perspective view of the insulating sheet in the first embodiment of the present invention. FIG. The developed shape of the insulating sheet 32 is a shape obtained by punching the sheet into a substantially T-shape as shown in FIG. The set hole 54 having the convex portion 55 provided in the flat surface portion 59 of the insulating sheet 32 is set so that the dimension in the width direction with the protruding portion 39 of the terminal block 16 is s <X <t <Y. Yes. Further, the set hole 54 is sized so as to penetrate the fixing screw 33 for fixing the plug receiving device 6 at the time of assembly, and the vicinity of the set hole 54 is from a confirmation window 52 provided in the body 4. The size can be confirmed.

  The hook portion 56 provided at one end of the cylindrical portion of the insulating sheet 32 and the mating hole 57 provided at the other end have a size of the fitting portion of the hook portion 56 and the mating hole 57 so that v> w> u. When the portion 56 is inserted into the alignment hole 57, it is held by the constricted portion 56a. That is, the cylindrical part 60 can be formed by fixing with the mating part 62 as shown in FIG. It is desirable for the insulating sheet 32 to have a thickness that can be folded when the mountain fold 63 after assembly is folded.

  FIG. 8 shows a state in which insulating tapes 58a and 58b for stabilizing the shape of the insulating sheet 32 are attached. After the insulating tape 58a having an appropriate size with the set hole 54 removed is pasted on the flat surface portion 59 of the insulating sheet 32, the insulating tape 58b is pasted on the cylindrical portion 60 so as to form an overlapping portion 61. As shown in FIG. 8B, since the mating portion 62 is fixed by the insulating tape 58b, the cylindrical portion 60 is not easily disassembled.

  As shown in FIG. 9, the insulating sheet 32 assembled and configured as described above has an arcuate portion 64 connecting the mountain-folded portions 63 at both ends of the cylindrical portion 60 to form the opening 65.

  Next, details of attachment of the insulating sheet 32 to the plug receiving device 6, attachment of the plug receiving device 6 to the body 4, and processing of the lead wires 18 will be described below. First, as shown in FIG. 10, the lead wire 18 drawn out from the attachment hole 47 of the main body 1 is passed through the opening 65 of the insulating sheet 32. Next, a connection terminal 19 provided at the tip of the lead wire 18 is inserted into the terminal 17 installed in the plug receiving device 6 to be connected. Next, the insulating sheet 32 is shifted to a position where it abuts against the abutting surface 42 (see FIG. 4) of the terminal block 16 and the end surface on the flat surface 59 side of the cylindrical portion 60. At this time, the cylindrical portion 10 is guided by the guide rib 43 (see FIG. 4), and guides the set hole 54 provided in the flat portion 59 to the vicinity of the protruding portion 39. Next, the set hole 54 is deformed within the elastic range and set to the protrusion 39. At this time, when the lower end of the convex portion 55 of the set hole 54 is attached so as to contact the fitting surface 40 of the terminal block 16, the end surface on the connection side of the flat portion 59 with the cylindrical portion 60 is the contact surface 42 of the terminal block 16. Is positioned in contact with the Further, since the contact portion has a dimension of s <X, it does not shift in the direction of the opening 65, and the protrusion 39 and the set hole 54 have a relationship of t <Y. There is nothing.

  FIG. 11 is a perspective view of the plug receiving device 6 to which the insulating sheet 32 is attached. When the insulating sheet 32 is attached to the terminal block 16, the charging portion inside the main body 1 of the plug receiving device 6, that is, the terminal 17, the connection terminal 19, and the like are covered with the insulating sheet 32.

  The shape of the insulating sheet 32 in FIG. 11 shows a state when the plug receiving device 6 is attached to the body 4, and the flat portion 59 of the insulating sheet 32 is pressed by the lower mating surface 49. It is folded at the end of the fitting surface 40 and deformed into a shape along the fitting surface 40. At this time, the set hole 54 does not cover the hole 38 disposed in the terminal block 16.

  Further, since the insulating tape 58a is not attached to the position where the insulating sheet 32 is bent, the insulating sheet 32 can be easily deformed into a shape along the fitting surface 40.

  FIG. 12 is a longitudinal sectional view of the plug receiving device 6 in use. In FIG. 12A, the insulating sheet 32 is omitted. First, the plug receiving device 6 to which the insulating sheet 32 is attached is attached to the mounting hole 47 so that it can be stored in the space 66 of the body 4 and the heat insulating material 20 from the lead wire 18 side drawn out from the mounting hole 47 of the body 4. Is inserted from below.

  At this time, since the insulating sheet 32 covers the edges of the metal parts such as the connection terminals 19, the outer bag of the heat insulating material 20 (vacuum heat insulating material) used in the present embodiment is damaged, and the vacuum inside the outer bag is damaged. The effect that the state is not impaired is also obtained.

  Next, when the cover portion 45 of the terminal block 16 forming the plug receiving device 6 is engaged with the step portion 46 provided on the body 4, the elastic engagement provided on the left and right side edges of the mounting hole 47 toward the inside. The stopper 53 is engaged with the engaging claw 44 provided on the terminal block 16, and the plug receiving device 6 is attached to the body 4. Further, the fixing screw 33 passes through the hole 50 provided in the screw housing 51 of the body 4 and the set hole 54 of the insulating sheet 32 and is tightened to the hole 38 of the terminal block 16 to fix the plug receiving device 6. To do. At this time, the insulating sheet 32 is sandwiched between the inner side surface of the body 4 of the hole portion 50 of the screw storage portion 51 and the mating surface 40 of the terminal block 16, and is securely held after being attached to the main body 1. be able to. Further, since the plug receiving device 6 is attached not only by the fixing screw 33 but also by the engagement of the elastic locking piece 53 of the body 4 and the engagement claw 44 of the terminal block 16, further integration with the main body 1 is further ensured. be able to.

  After assembling the plug receiving device 6 to the main body 1, the insulating sheet 32 folded at the end of the mating surface 40 of the terminal block 16 can be confirmed from the confirmation window 52 of the body 4. That is, the presence or absence of the insulating sheet 32 can be confirmed without removing the plug receiving device 6.

  The lead wire 18 is guided downward at the end face of the opening 65 of the insulating sheet 32 and connected to the heating means, the control circuit board, and the like inside the main body 1. At this time, since the insulating sheet 32 has high rigidity due to the insulating tape 58b, the insulating sheet 32 is stably assembled in a shape without being bent.

  As described above, the plug receiving device 6 is assembled to the main body 1 by joining the terminal 17 provided on the terminal block 16 and the connection terminal 19 provided at the tip of the lead wire 18, It can be made easy to disassemble. Since the male electrode pin 14, the terminal 17, the connection terminal 19, and the insulating sheet 32 are all within the width L of the terminal block 16 in a state where the plug receiving device 6 is assembled in the mounting hole 47 of the body 4, the plug receiving device 6 can eliminate the influence on the internal structure and appearance of the main body 1.

  As described above, the plug receiving device according to the present invention has no influence on the internal structure and appearance of the main body, and the connection terminal provided at the tip of the lead wire can be freely attached to and detached from the terminal provided on the terminal block. Therefore, since it becomes easy to assemble and disassemble the plug receiving device on the main body, it can be applied to small household appliances such as electric appliances such as rice cookers, electric water heaters, and pottery cookers.

The perspective view of the electric pot using the plug receiving apparatus of Embodiment 1 The exploded perspective view seen from the front of the state where the electric water heater same as the above is turned upside down The exploded perspective view seen from the back of the state where the electric water heater same as the above was turned upside down (A) Front view of the same plug receiving device (b) Sectional view taken along line AA in (a) view (c) Bottom view of the same plug receiver (d) Side view of the same plug receiver (e) Same as above (F) Perspective view of the same plug receiver The detailed perspective view which looked at the plug receiving apparatus of Embodiment 1 from the outer side of the attachment part (A) The detailed perspective view which looked at the state which removed the plug receiving device same as the above from the inside (b) The detailed perspective view which looked at the mounting state of the plug receiving device same as the above from the inside (A) Exploded view of insulating sheet attached to plug receiving device of embodiment 1 (b) Assembly drawing of insulating sheet same as above (A) Back view of (b) (a) with insulating tape affixed to the same insulating sheet Perspective view of the insulation sheet The perspective view of the assembly state of the plug receiving apparatus of Embodiment 1 The perspective view of the state which attached the insulating sheet to the plug receiving apparatus of Embodiment 1 (A) Longitudinal sectional view of the plug receiving device of the first embodiment in use (b) Cross sectional view taken along line AA in (a) (c) Cross sectional view taken along line BB in (a)

DESCRIPTION OF SYMBOLS 1 Main body 6 Plug receiving device 14 Male electrode pin 16 Terminal block 17 Terminal 18 Lead wire 19 Connection terminal 32 Insulation sheet 33 Fixing screw 37 Crimp part 39 Projection part 40 Mating surface 44 Engagement claw 45 Cover part 46 Step part 47 Installation hole 51 Screw storage part 53 Elastic locking piece 54 Set hole 55 Convex part 59 Plane part 60 Cylindrical part

Claims (2)

A terminal block having a pair of electrode pins fixed to a terminal that joins the connection terminal facing upward on the main body, and the connection terminal provided at the tip of a lead wire connected to an internal electrical component on the terminal,
An insulating sheet provided with a cylindrical portion that covers the connection between the terminal and the connection terminal, and a flat portion that covers the fixing portion of the electrode pin of the terminal,
An abutting portion that abuts on the connecting side of the insulating sheet cylindrical portion installed on the terminal block and the planar portion;
An engagement protrusion having a retaining portion after passing through the hole provided in the flat portion of the insulating sheet and once passing,
A plug receiving device for an electric device that is configured to be positioned in a penetrating direction after passing through the terminal and the connection terminal, and is arranged and fixed from below the main body. The plug receiving device for an electric device according to claim 1, wherein one end of the insulating sheet punched into a substantially T shape is processed into a cylindrical shape.