The utility model content
According to first aspect of the present utility model, be provided for the heater of liquid heater tool, described heater comprises the heating element heater plate, have heating element heater and the heat transfer plate between described heating element heater plate and the described heating element heater that has a sheath of sheath, described heat transfer plate comprises at least one notch, is positioned in the described notch to allow the described terminal that has the heating element heater of sheath.
According to first aspect of the present utility model, be provided for the heater of liquid heater tool, described heater comprises the heating element heater plate, have heating element heater and the heat transfer plate between described heating element heater plate and the described heating element heater that has a sheath of sheath, described heat transfer plate comprises at least one notch, is positioned near the described notch to allow the described terminal that has the heating element heater of sheath.
Described terminal can be arranged essentially parallel to described heating element heater plate.In addition, described terminal can be suitable for welding on the online or dull and stereotyped lead.The described heating element heater that has sheath can be arranged essentially parallel to described heat transfer plate.
The length of the cold junction of the described heating element heater that has a sheath can reduce with respect to the traditional heating element heater that has sheath that is arranged on traditional heat transfer plate.The length of cold junction that has the heating element heater of sheath can reduce between 15% to 20%.
The described heating element heater that has sheath can all comprise contact portion on each terminal.Described contact portion can be cold junction.Described cold junction can be arranged essentially parallel to described heating element heater plate to be provided for the horizontal level of electrode, in order to electric wire is soldered to described cold junction.Described cold junction can be away from described heating element heater plate location, so that electrode can enter.
The far-end of cold junction can overlap each other.Alternatively and/or in addition, the far-end of cold junction can approximate vertical extend upward.The described far-end of described cold junction can the folding or bending away from described heating element heater plate perpendicular.
According on the other hand of the present utility model, provide the heat transfer plate that comprises at least one notch.
According on the other hand of the present utility model, be provided with roughly half moon-shaped heat transfer plate.
According on the other hand of the present utility model, be provided with the liquid heater tool, described heater comprises the heating element heater plate, have heating element heater and the heat transfer plate between described heating element heater plate and the described heating element heater that has a sheath of sheath, described heat transfer plate comprises at least two notch, one of them notch allows the described terminal that has the heating element heater of sheath to be positioned near the described notch, and another notch allows steam pipe and/or other positioning parts near described another notch.
According to the heating element heater plate that is provided with on the other hand for heating vessel of the present utility model, described heating element heater plate comprises central flat portion basically, have at least one passage in described central flat portion, described at least one passage is used for reinforcing described central flat portion and reducing warpage.
Described heating element heater plate can comprise a plurality of radial passages.Described radial passage can be separated equally spacedly.Described radial passage can have rectilinear form.Described radial passage has the shape of bending or horn shape.
Described at least one passage can be helical duct or circle-shaped basically.
The thickness of described heating element heater plate can reduce to increase the heat transmission with respect to traditional heating element heater plate and/or reduce material usage.The thickness of described heating element heater plate can reduce and reaches 60%.The thickness of described heating element heater plate can be between 0.2 and 0.3 millimeter.Alternatively, the thickness of described heating element heater plate can be to be less than 0.4 millimeter.
Described heating element heater plate can also comprise the peripheral par in the outside of described central flat portion.Described peripheral par can by at least one passage and/or vertical extension member and described central flat partly from.Described peripheral par can be positioned at identical plane with described central flat portion.The plane of described peripheral par can be above or below the plane of described central flat portion.
Described at least one passage can be recessed passage or projection passage.
A kind of heat transfer plate for the heating element heater plate, wherein said heat transfer plate can comprise at least one jut that is bonded with each other or partly is bonded with each other with corresponding projection passage.The external diameter of described heat transfer plate makes at least one gap can be set up as the pressure relief device in the process that described heat transfer plate is fastened to described heating element heater plate in the inboard of the far-end of a projection passage.
Described heat transfer plate can comprise the hole with the overlapping center basically of the near-end of at least one projection passage, makes at least one gap to be provided as described heat transfer plate is fastened to pressure relief device in the process of described heating element heater plate.
Described heat transfer plate can extend beyond far-end and/or the near-end of at least one projection passage, at least one recess or the portion of cutting away can be arranged in the zone of described far-end and/or near-end partly, as the pressure relief device in the process that described heat transfer plate is fastened to described heating element heater plate.
Described heat transfer plate can be provided with at least one recess, and described at least one recess is used for being bonded with each other with corresponding recessed passage or part is bonded with each other.
Embodiment of the present utility model has been contained a series of open, and these openly comprise:
A) comprise the device of the cost of the associated components in the utensil of firing equipment in order to minimizing.
B) in order to the device of the cost that reduces relevant appliance.
The specific embodiment
In the following description, the parts that function is identical are represented with identical Reference numeral between different embodiment.Accompanying drawing will be schematically, and except as otherwise noted, its size and angle should not determined exactly.
Below explanation discloses the combination of measure, and it will advantageously influence the cost and price of their all aspects.
Reduce price for avoiding the repetition of background, illustrate relating to, reduce material cost and reduce size etc., but will consider in this case and concrete each that discloses in the relevant above-mentioned aspect.
Solution shows in the application's independent parts, and in these parts each will comprise the brief introduction to particular problem.
At least some embodiment can depend on or represent or relate to the parts of Fig. 1 by the Reference numeral among reference Fig. 1.
In the argumentation of the utility model, specification and claim, unless otherwise mentioned, term liquid has identical implication with the water intention.
In the explanation of specification of the present utility model and claim, unless otherwise mentioned, term kettle, utensil, container and holder can have identical implication.
In the argumentation of specification of the present utility model and claim, unless otherwise mentioned, terms part has identical implication with the part intention.
In specification and claim, when describing part of electrical connection or switching device, term separates contact, contact site and contact area intention and has identical implication.
In specification and claim, when describing part of heating element heater, the term heat transfer plate has identical implication with the thermal diffusion plate intention.
Fig. 1 has schematically shown the immersion band handle kettle (jug kettle) with mechanical actuator, as the example of the liquid heater tool that can use embodiment of the present utility model.In this example, this kettle is wireless kettle, it comprises container body 1 and power source base 2, container body 1 and power source base 2 have main body cordless connector 3 and pedestal cordless connector 3 and 4 separately, and cordless connector 3 and 4 for example is 360 ° of cordless connectors of the described type that illustrates among the patent documentation WO94/06285 that has of applicant and/or 360 ° of cordless connectors based on CS4/CS7 (power source base socket) and A1 and CP7 or CP8 (appliance plug) standard of being sold by Otter Controls Ltd..Power source base 2 can be connected to supply socket (electrical power outlet, not shown) by power line 13.In container 1 and/or pedestal 2 and/or cordless connector 3 and/or the cordless connector 4 each can be provided with transmitter and/or detector 31, annular seal 21, and this annular seal can be ring 41 optical transmission and/or the ring-type optical transmission.
Immersion band handle kettle can comprise electronic controller or electromechanical controller 60, for example the integrated 360 ° of controllers of A1 series or the electronic controller 15 that have of applicant.Electromechanical controller 60 can comprise integrated steam cock 73 or alternatively can for example in the handle 9 discrete steam cock 73a be set.Utensil can be provided with switch actuator 305 or 305a, and this switch actuator and controller 60 for example interact by the known center trip lever mechanism (not shown at Fig. 1) of crossing, to switch between the mode of operation of utensil.Alternatively, electronic controller 15 can use alternative user interface 11.Any one or both can be in container 1 and/or the pedestal 2 among one or both in electronic controller 15 and/or the user interface 11.
Container body 1 comprises be used to the holder 5 that holds liquid to be heated, lid 8, kettle mouth 7, handle 9 and has the base portion 6 of sub-base portion 19 that sub-base portion 19 forms the bottom surface of container bodies 1.The kettle mouth can provide main ventilation and/or isostasy.Lid 8 can be operated to open and close by user's actuator, and can be fastened to described container by hinge, lock bolt or other device.Lid can be sealed to container fastenedly, makes lid keep in position, and can leakage liquid under the situation of utensil overturning.
Steam pipe 70 and steam lid 101 can be set.Steam pipe from the regional connectivity of water level 225 tops to steam switching device shifter 73 or 73a.Steam pipe can for example form the part of handle 9 or reservoir wall 5 or be formed as shown and be independent pipe.Pass at steam pipe under the situation of element, suitable seal 584 and additional steam guiding piece 599 then can be set.Container body 1 can have Any shape, and for example can be formed by plastics, metal, glass or pottery.Container body can comprise single wall as shown in the figure, or comprises double-walled alternatively, and it is cool in order to can touch making container for example to be insulated better to prevent heat loss or making wall.
By element board 12 heating liquids, element board 12 can form the pedestal of reservoir 5.The reservoir 5 of utensil 1 can be provided with other parts of the state of watermark and/or indication utensil 1.Element board 12 comprises heater and connects to receive electric power by connector 3.Heater can comprise the element that has sheath 39 as shown in the figure, maybe can comprise thick film element and/or die casting arrangements of components.Heat-transfer arrangement 410 and element board 12 can be set can be made of stainless steel and/or other suitable substrate.As shown in the figure, can utilize (RTM) seal arrangement of the Easifix described in the WO-A-99/17645 or use the sealing device for example bond, weld or clamp that element board 12 is sealed to container body 1 alternatively.Element board 12 can be supported in the container 1 by removable annular support member 401.The element sealing system can also be included in the intermediate flange 438 between element board 12 and the container 1.
At least some embodiment of the present utility model can be applicable to heating vessel, and described heating vessel has the heating element heater that is immersed in the water, rather than the element on the bottom side of container.
At least some embodiment of the present utility model can be applicable to heating vessel, and described heating vessel can directly connect by power line, rather than connect by cordless connector.
At least some embodiment can be applicable to: kettle or heat tracing bottle and jar, agitator, flatiron, water heater, coffee and espresso maker, juice extractor, Sorbet maker, food processor, boil soup device, baste maker, boiling vessel, tea cooking machine, chocolate fountain, cheese chafing dish, slow cooker, vacuum kettle, milk frother, water dispenser, pot, automatic vending machine and/or need the utensil of hot water.It is not exhaustive should understanding above-mentioned tabulation.
Reduce the element board of thickness
In the prior art, element board 12 is usually between 0.4 and 0.5 millimeter, and thickness reduces to 0.3 millimeter or 0.2 millimeter quality of materials that will reduce up to 60% preferably.
In the prior art, the most of element boards in the liquid heater tool comprise the peripheral
circumferential part 480 that the flat that makes
plate 2 is gained in
strength.Portion 480 as shown in the cross section of Fig. 3 is found in usually
In the type element.Alternatively or in addition, peripheral
circumferential part 480 can be provided as ' the rocking portion ' as shown in the cross section of Figure 13.In other embodiments, can use the peripheral circumferential part (not shown) that has similar effects and fall into other form within the scope of the present utility model.
Although be to expect the distortion of circumferential part, this circumferential part and/or the rigidity that combination can be enough to keep the element board 12 at periphery place, have thin plate 12 (inboard of portion 480) more close center part 483 in use (for example under the effect of the stress of heater (not shown)) problem of warpage can appear.
Following examples are described this problem and device in order to the central flat portion 483 that reinforces thin element board 12 are provided, and make not warpage during use of plate 12.
Fig. 2 to 4 illustrates first embodiment of smooth heating element heater plate 12, and wherein smooth heating element heater plate 12 is provided with the central flat portion 483 of the inboard of the periphery 480 of projection and this one 480.Hole 141 can be arranged in the plate 12 to allow the steam pipe (not shown) to pass through.
The cross section of Y-Y by Fig. 2 as shown in Figure 3, described 480 can comprise the section of extending upward 12a, the section of stretching out 12b,
extension 12c and the section of stretching out 12d make described can for example be formed for downwards
The interface of sealing device.
In central flat portion 483, be provided with the center of slave plate 12 towards the outward extending a plurality of linear radial projection passages 482 of periphery, make central flat portion 483 be reinforced and in use can warpage.
Fig. 2 has shown eight projection passages 482 that equidistantly separate, yet in this embodiment and other embodiment, the quantity of jut and/or spatial distribution can be changed to adapt to concrete application.
Figure 17 has schematically shown the cross section of the projection of the arch basically passage 482 of Fig. 2,5 and 8 embodiment.The height of jut segmentation 482 (size U) is 2 to 3 times of the thickness of heating plate 12 (size T) preferably.The shape and size of the jut among Figure 17 are to be not limited to the utility model, and in other embodiments, the cross section of passage 482 for example can be triangle or other suitable form or shape, and size U can be greater or lesser.
Fig. 5 has shown the vertical view of the smooth heating element heater plate 12 of Fig. 2, and wherein the bottom side of element board 12 is provided with heat transfer plate 410 (shown in broken lines) and is connected to the element (not shown) that has sheath of plate 12 by for example brazed process, friction welding, punching press or alternate manner.
During heat transfer plate 410 is connected to element board 12, preferably the space between the passage 482 is filled with from heat transfer plate 410 and/or the material of brazing for example, thereby has avoided the airbag (pocket) of air in the passage or other gas.Comprise in connected mode under the situation of fluid treatment of for example brazing, then preferably in the inside of passage 482 or one of outer end or both connection is set, make gas can discharge and allow fluent material filling channel 482.This can by in the end of each passage one or two the place partly ' release ' heat transfer plate 410 obtain.
As shown in phantom in Figure 5, the external diameter of heat transfer plate 410 can be positioned at the inboard of the far-end of passage 483, and making to provide gap 485, and gas is discharged by gap 485.In addition or alternatively, the interior section of heat transfer plate 410 can be provided with the hole overlapping with the near-end of passage 482, the similar device of the more close center of the near-end of this passage 482 to provide gas to discharge.
Alternatively as shown in Figure 7, heat transfer plate 410 can extend beyond passage 482, and therefore the recess of the plate 410 in the zone of the one or both ends by each passage 482 or notch 487 provided the gap to discharge described gas by local ' removing '.
In other embodiments, corresponding jut 486 can by for example punching press, moulding or draw to handle and be formed in the heat transfer plate 410, makes and utilizes material to fill the projection passage before connecting processing.
Advantageously, the filling of passage 482 can provide extra intensity and rigidity to heat transfer plate 410 and element board 12, makes the flat of plate 12 in use to keep smooth basically.
Figure 12 has shown the schematic diagram of the another embodiment of smooth heating element heater plate 12, this smooth heating element heater plate 12 have be formed on heating element heater plate 12 central flat portion 483 basically the top projection circumferential channel 480.In central flat portion 483, be provided with and have another spiral-shaped projection passage 481.Circumferential channel 480 and helical duct 481 are substantially concentric with heating element heater plate 12.As shown, the width of passage 480 and the degree of depth are wideer and darker than width and the degree of depth of passage 481 basically; Yet in other embodiments, passage 480 and 481 can have more equal ratio.
Figure 15 and 16 has shown the schematic diagram of two other embodiment, these two other embodiment provide optional structure and the layout of passage, wherein radial passage 482 comprises bend and/or horn shape portion, make them form sped structure at the flat surfaces of heating element heater plate 12, wherein passage 482 from the central part of foregoing element radially.
The passage 482 of Figure 12,15 and 16 embodiment can be the projection of the arch basically passage that schematically shows in the cross section that passes through X-X as Figure 17.Yet, in scope of the present utility model, also can use the passage 482 of other form or shape.
Fig. 8 has shown the distortion of first embodiment that shows among Fig. 2 to 6, and can be applied among Figure 12,15 and 16 embodiment that shows, at least one another circumferential projection passage 481 and/or passage 484 wherein are provided, this passage 481 and/or passage 484 can be towards the par 483 periphery and/or towards the par 483 centralized positioning and further gusset plate 12.
Fig. 8 has shown that further central flat portion 483 can separate with periphery 480 by projection passage 481.In as shown in Figure 3 other embodiment for example, central flat portion 483 can separate with periphery 480 by vertical extension member 12a.
Go out as shown, passage 482 separately is formed into circumferential part 480 and circumferential channel 481 and 482; Yet in other embodiment shown in Figure 10 and 11, one or more passages 483 can connect, and are formed by in circumferential part 480 and/or circumferential channel 481 and 482 any, or are connected in circumferential part 480 and/or circumferential channel 481 and 482 any.
The embodiment of heating element heater plate 12 allows the material thickness of element board 12 to reduce, and this has advantageously produced the material cost that rapider and more effective heat is transmitted and reduced heat transfer plate 410.
Reduce heat transfer plate and the related elements of material
Figure 18 has shown that integrated form steam controller, the drying of the proprietary A1 series of the application boil protective device and 360 ° of electric connectors 520 in the installation that is used on the swedged element board 12 of swedged container 1.As shown in the figure, controller 520 is in conjunction with the bare wire conductor 512 of explanation subsequently in the part in the back.
To be confined to for example to combine at assembly under the situation of utensil type of the external steam pipe of certain form or other temperature control equipment, obviously can not have in order to steam pipe is installed on the element board 12 or element board 12 in the space, certain form of this external steam pipe or other temperature control equipment can be to implement to reduce the restriction factor of the element of size.
In addition, shown in the schematic cross-sectional of passing through the A-A among Figure 18 of Figure 19, the cold junction 578 of the sheath 39 of standard prior art element is bent upwards at each far-end.Cold junction 578 is bent upwards and makes the insulation division 582 of the element 39 have sheath away from heat transfer plate 410 location, thereby when element 39 was brazed on the heat transfer plate 410, brazing material during use can bridge joint insulation division 582 and made utensil 1 short circuit.This layout can further increase such as electrical clearance distance between the mechanical electric power connection of tab terminal and described heat dissipation device 410.Yet the inclination cold junction 578 of sheath has problem when being welded to sealing wire conductor 512 or the smooth conductor 519 of prior art on the cold junction 40.For example, the uncertain angle of cold junction 40 can make and be difficult to the line conductor is navigated on the cold junction 40 of preparing for welding process.
In addition, comprise that at this some place the bend in the element has increased cost and complexity for making sheathed heater 39.Electrical connection 585 between cold junction 40 and the resistive conductor 580 is known weakness in the guard component 39, and is important for guaranteeing that this joint is positioned at the center in magnesia 581 (as seal).Make sheath 39 bendings in the zone 585 that cold junction 40 and heater resistance line 580 intersect to cause cold junction 40 and/or the center of resistive conductor 580 from sheath 39 to be moved, and can end electric insulation.For fear of this risk, increase cold junction length and make crooked being formed on basically in the length of cold junction 40, and cold junction 40 keeps center in the sheath 39 at the some place that cold junction 40 is connected to resistive conductor 580 subsequently.
Following examples pair are studied with above-mentioned relevant problem, and described problem comprises:
A) relation of the steam pipe 141 between controller 520 and the heating vessel 1,
B) location, shape and the length of sheathed heater 39 and the cold junction 40 that is associated,
C) relation of bare wire conductor 512, cold junction 40 and heat transfer plate 410 and
D) size and dimension of heat transfer plate 410.
In addressing these problems, further cost-saving measure will be disclosed, this not only may be used on these embodiment, and is applicable to additional application.
Each scheme that addresses these problems can be used in the insulation division or preferably, except overcoming above-mentioned relevant problem, the combination of these solutions can be used with abundant development cost saving.
Figure 20 to 24 has shown the new embodiment that overcomes the problems referred to above.
Figure 20 is schematic diagram, and Figure 22 is the stereogram of exemplary embodiment, wherein said element sheath 39 form bowed shape, " D " shape element basically, in the zone 588 of the heat transfer plate 410 of sufficient size, to provide the space, location steam pore 141 in this space, and locate the packing ring 584 that is associated if necessary, shown in the stereogram of Figure 22.
Be appreciated that, the length of element reduces about 10% to realize " D " shape bowed shape element, thereby this bowed shape element increases power density or load, and preferably it is not that the utility model is limited, and any bend all is mild in order to avoid weakness in the insulation division in the sheath 39.
Advantageously, other embodiment will openly alleviate the attachment device of power density problem, and it is shorter to make that leement duration can have prior art identical or more low power density or load relatively.
As shown in figure 22, sheath 39 and heat transfer plate 587 are connected on the swedged element board 12 by brazing or other device, and the steam pipe 70 by the hole 141 in the space 588 is arranged in the swedged element board 12.
Shown in the schematic cross-section of the A-A that passes through Figure 22 of Figure 23, present embodiment can be configured and make sheath 39 and heat transfer plate 410 keeping parallelisms, and cold junction 40 is arranged essentially parallel to plate 12.Advantageously, this will provide consistent horizontal level with the electrode (not shown) that line conductor 512 is welded on the cold junction 40 for being used for.
In addition, known line conductor 512 relatively for example tab terminal occupies less space, and distance can be reduced between the far-end of sheath then, and therefore helps any minimizing of compensating element, length, can need this to compensate to realize disclosed form.
Advantageously, the parallel profile of sheath 39 has alleviated the problem of the bend in the previously described cold junction 40, make the length of cold junction 40 to be reduced and the corresponding cold junction 578 of sheath 39 can reduce identical length, thereby the total length of new element can be shorter than prior art, and the effective length of sheath 39 can keep identical simultaneously.The effective length of sheath 39 limits by the zones that resistive conductor 580 wherein is present in the sheath 39, and therefore heat is delivered to heat transfer plate 410 from resistive conductor 580.The element of " D " the basically shape bowed shape that shows in therefore, can under the situation of the power density that does not increase sheath 39 or load, making as Figure 20.
Compare with 45 to 50 millimeters prior art length, the length that calculates each cold junction of present embodiment according to cost savings will be in 25 to 30 millimeters scope.Therefore the combination saving of two cold junction length will be in 30 to 50 millimeters scope.Therefore usually, element formerly can have about 250 millimeters length, if the saving of cold junction causes the equal minimizing of leement duration, then material cost is potential has reduced between 12% and 20%.
Shown in Figure 20,22 and 23, release portion can be arranged in the zone 589 of heat transfer plate 410, thereby provides additional electric gap between cold junction 40 and other metal parts.
Release portion can also be arranged on heat transfer plate 410, in the zone 589 below the flange 586 at each end place of sheath 39, make each flange 586 can be located immediately on the element board 12 basically and cold junction 40 can keeping parallelism.
Advantageously, discharging heat transfer plate 410 in zone 589 will provide additional height, and electrode will be inserted in this additional height.
In addition, when element 39 was brazed on the heater transfer plate 587, the release portion zone 589 in the heat transfer plate 587 allowed insulation division 582 more close heating plate 12 under the situation of the risk that does not have brazing material bridge joint insulation division 582 of element 39 to be positioned.
In other embodiments, the distance between the cold junction 40 (size V) can be reduced, and makes cold junction 40 be close together or overlapping.This can be provided in the chance of carrying out two welding in the single operation.Reduce any minimizing that distance between the cold junction 40 can also help regulating element length, the minimizing of this leement duration need realize basically " D " shape bowed shape.
In other embodiment (not shown), zone 588 can be utilized to arrange the optional feature that includes but not limited to thermistor, light-emitting device, PTC element, carriage and permanent plant.
In other embodiment (not shown), second basically circular warm keeping element sheath (not shown) can around or the sheath 39 of adjacent " D " basically shape bowed shape arrange, make that zone 588 can for example steam pipe or other parts keep free relatively.
In other embodiments, circular heat transmission plate 410 can be provided with the zone 588 and 589 that the quilt that schematically shows as Figure 21 prunes away basically.
Advantageously, the heat transfer plate 587 relative prior aries of pruning are very narrow between notch, and the material economy of essence can be provided for element manufacturer.Figure 21 compares with develop and print out four shapes 410 in the plate of equal length by notch is schematically demonstrated the blank plate of similar width with 90 ° of edges that navigate to blank plate 583 basically, and this can develop and print five plates providing shape 587.
Similar saving can be produced by the location, edge that notch is arranged essentially parallel to blank plate, by this, narrower blank plate (not shown) can be used.Alternatively, can also use other layout with suitable positioned/oriented heat transfer plate, the suitable positioned/oriented of this heat transfer plate provides similar saving and/or has fallen within the scope of the present utility model.
The actual saving that has calculated the material between heat transfer plate 410 and the heat transfer plate 587 is approximately 18%, and expects that usually this saving will be in 15% to 20% scope.
For example, between the relative prior art of material cost of the element sheath in the exemplary embodiment that in Figure 23, shows few 12% and 20%, and be used between the relative prior art of material cost few 15% and 20% of heat transfer plate 589.
Figure 24 has shown everyone previously described OtterA1 series controller 520 that is assembled on this exemplary embodiment of the application, also comprises line conductor 512 and the steam actuator 73 that connects with steam pipe 70 by the hole 141 in the space 588.
Optional embodiment
Clearly: embodiment four corner and combination have scope widely; Yet, concerning the those skilled in the art that understood description wherein, can between embodiment, carry out the particular problem that scheme conversion meets the indivedual utensils in the utility model scope.
Above-described embodiment only is illustrative, and is not that the utility model is limited.Optional embodiment obviously can fall within the scope of the present utility model understanding above-mentioned explanation.