CN115985598A - Plane power resistor easy and convenient to assemble and production process - Google Patents
Plane power resistor easy and convenient to assemble and production process Download PDFInfo
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- CN115985598A CN115985598A CN202310198664.2A CN202310198664A CN115985598A CN 115985598 A CN115985598 A CN 115985598A CN 202310198664 A CN202310198664 A CN 202310198664A CN 115985598 A CN115985598 A CN 115985598A
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Abstract
The invention discloses a plane power resistor with simple and convenient assembly and a production process, comprising the following steps: casing and resistance chip, be connected through the elastic layer between resistance chip's the top surface and the casing, resistance chip's side and casing joint, the elastic layer makes resistance chip spacing removal in the casing. During assembly, only the resistor chip is required to be inserted into the cavity of the shell, the elastic layer can be elastically abutted against the inner top surface of the shell, the resistor chip is clamped with the shell, and the bottom surface of the mounted resistor chip is arranged to protrude out of the bottom surface of the shell; from this when installation plane power resistor, the bottom surface of resistance chip forms the extrusion force for the elastic layer compression makes the bottom surface of resistance chip and the plane elasticity butt that can dispel the heat between the two, prevents the space to appear between the two at the top surface of resistance chip and the interior top surface of casing, so, when plane power resistor during operation, can promote its heat dispersion, guarantees the convenience of resistance chip and casing assembly simultaneously.
Description
Technical Field
The invention relates to the technical field of resistors, in particular to a planar power resistor easy and convenient to assemble and a production process.
Background
The planar power resistor is applied to the field of electrical equipment such as power generation, power transmission, variable speed driving and the like. When the resistor is installed, the planar power resistor is usually installed on a plane capable of dissipating heat, so that heat generated by the operation of the resistor chip is effectively dissipated, therefore, the bottom surface of the resistor chip needs to be in close contact with the plane capable of dissipating heat to ensure heat dissipation performance, and particularly, the high-power resistor has large heat generation amount during operation and high requirement on heat dissipation performance.
In the prior art, a planar power resistor is generally formed by sleeving a shell on the outer side of a resistor chip and then performing glue pouring to fixedly connect the resistor chip and the resistor chip, the assembly mode is simple, but when the planar power resistor is actually used, the bottom surface of the resistor chip in the assembly mode is in contact with a plane capable of dissipating heat, so that a gap is easily generated, and the heat dissipation effect is influenced; therefore, it is necessary to improve heat dissipation performance while ensuring convenience of assembly. Therefore, there is a need for a planar power resistor and a manufacturing process that is easy to assemble and that at least partially solves the problems of the prior art.
Disclosure of Invention
In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
To at least partially solve the above problems, the present invention provides a planar power resistor which is easy to assemble, comprising: casing and resistance chip, be connected through the elastic layer between resistance chip's the top surface and the casing, resistance chip's side and casing joint, the elastic layer makes resistance chip spacing removal in the casing.
Preferably, the top surface of casing is equipped with first mounting groove, be equipped with the pin piece in the first mounting groove, after the pin of resistance chip passed the casing, connect between pin piece and first mounting groove.
Preferably, the resistance chip includes: the heating panel, metal level, potsherd and electrode that set gradually from bottom to top, two be equipped with the resistance layer between the electrode, be connected with the pin on the electrode, partly surface and the resistance layer surface of two electrodes cover has the protective layer, and the surface of another part surface and the protective layer of two electrodes covers has the elastic layer.
Preferably, the top surface of casing is equipped with the separating tank, forms the isolation tank between the adjacent separating tank, be equipped with the lug in the separating tank, the top surface one end of lug is equipped with the nut mounting hole that is used for mounting nut and the through-hole that makes resistance chip's pin pass from top to bottom in proper order, the top surface other end of lug is equipped with the first mounting groove that is used for with pin piece joint, the intercommunication has the spread groove between first mounting groove and the nut mounting hole, the pin is connected with the pin piece.
Preferably, the lead sheet includes: the fixing plate is provided with a notch, an elastic sheet is arranged at the notch, the elastic sheet is inclined towards one side away from the connecting sheet and forms an included angle with the fixing plate, and a protruding portion is arranged on one side, away from the connecting sheet, of the elastic sheet.
The bottom of flexure strip is equipped with first arc wall.
One side of the first mounting groove, which is far away from the nut mounting hole, is provided with a second arc-shaped groove.
The depths of the first arc-shaped groove and the second arc-shaped groove are not larger than the radius of the pin.
Preferably, the side surface of the resistor chip is clamped with the shell through a clamping piece;
the medial surface bottom of casing is equipped with the second mounting groove that is used for installing joint spare, resistance chip's side bottom is equipped with the spacing groove, the spacing groove is used for preventing resistance chip to remove to its bottom direction, and when resistance chip received external force, makes resistance chip can remove to its top direction.
Preferably, the clip includes: the U-shaped main body is provided with a first clamping part in an extending mode, a second clamping part in an extending mode is arranged at the other end of the U-shaped main body in an extending mode, the second clamping part extends to the outside of the second mounting groove and is clamped with the limiting groove;
the top surface of second mounting groove is equipped with the first draw-in groove that corresponds with first joint portion, the bottom surface of second mounting groove is equipped with the third arc wall that corresponds with the U-shaped main part.
Preferably, the stopper groove includes: the second draw-in groove that corresponds with second joint portion, the below of second draw-in groove is equipped with pushes away the indent, the one side that the second mounting groove was kept away from to push away the indent is the inclined plane, the one end degree of depth that pushes away the indent and be close to the second draw-in groove is greater than its other end degree of depth.
Preferably, the two opposite sides of the bottom end of the shell extend outwards to form mounting plates, and the bottom end of the heat dissipation plate protrudes out of the bottom surfaces of the mounting plates;
the improved resistor is characterized in that a first step face is arranged on the inner side of the shell and located above the clamping position of the resistor chip and the shell, a groove is formed in the first step face, an annular elastic body is arranged in the groove, and one side of the annular elastic body protruding out of the first step face abuts against a second step face formed on the heating panel.
The invention also provides a production process of the plane power resistor with simple and convenient assembly, which comprises the following steps:
s100, printing sintering electrodes on two sides of the top surface of the ceramic wafer, and printing a sintering metal layer on the bottom surface of the ceramic wafer;
s200, printing a sintered resistance layer on the top surface of the ceramic sheet, connecting the resistance layer between two electrodes, and correcting the resistance of the formed resistance layer;
s300, printing a sintering protective layer on partial surfaces of the two electrodes and the surface of the resistor layer;
s400, welding a heat dissipation plate on the metal layer on the bottom surface of the ceramic chip, and welding pins on the electrode on the top surface of the ceramic chip to form a resistor chip;
s500, before or after the resistor chip and the manufactured shell are assembled, elastic layers are formed on the other part of the surfaces of the two electrodes and the surface of the protective layer;
before the resistance chip is assembled with the manufactured shell, coating silicon rubber on the other part of the surfaces of the two electrodes and the surface of the protective layer to form the elastic layer; or after the resistor chip and the manufactured shell are assembled, injecting silicon rubber into a space area formed between the resistor chip and the shell through the glue injection hole on the top surface of the shell to form an elastic layer;
s600, after the resistor chip and the manufactured shell are assembled, the pins are connected with the pin pieces, and the pin pieces are fixed with the shell.
Compared with the prior art, the invention at least comprises the following beneficial effects:
according to the plane power resistor easy and convenient to assemble and the production process, when the manufactured resistance chip is assembled with the shell, only the resistance chip needs to be inserted into the cavity of the shell, the elastic layer can be elastically abutted against the inner top surface of the shell, the resistance chip is clamped with the shell, the bottom surface of the installed resistance chip protrudes out of the bottom surface of the shell, and the assembly is convenient; the resistance chip can be prevented from being separated from the shell by clamping between the resistance chip and the shell, and the resistance chip can move into the shell when the bottom surface of the resistance chip is pushed inwards by external force;
therefore, when the planar power resistor is installed, the planar power resistor and the plane capable of dissipating heat are installed generally by utilizing screws, then along with the locking of the screws, extrusion force is formed on the bottom surface of the resistance chip, and the elastic layer is compressed between the top surface of the resistance chip and the inner top surface of the shell, so that the bottom surface of the resistance chip is in elastic butt joint with the plane capable of dissipating heat, the resistance chip is in close contact with the plane capable of dissipating heat, a gap is prevented from being formed between the bottom surface of the resistance chip and the plane capable of dissipating heat, therefore, when the planar power resistor works, the heat dissipation performance of the planar power resistor can be improved, and meanwhile, the convenience in assembling the resistance chip and the shell is guaranteed.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram of the internal structure of a planar power resistor according to the present invention, which is easy to assemble;
FIG. 2 is a schematic diagram of a planar power resistor according to the present invention that is easy to assemble;
FIG. 3 is a schematic diagram of the housing structure of the planar power resistor of the present invention;
FIG. 4 is a schematic diagram of a pin sheet structure of the planar power resistor according to the present invention;
fig. 5 is a schematic view of an installation structure of a pin sheet and a housing in the planar power resistor with simple assembly according to the present invention;
fig. 6 is a schematic view of a cross-sectional structure of a pin of the planar power resistor of the present invention;
fig. 7 is a schematic top view of a housing with glue injection holes for a planar power resistor according to the present invention;
fig. 8 is a schematic view of an installation structure of a clamping member, a heat dissipation plate and a housing in the easily assembled planar power resistor according to the present invention;
fig. 9 is a schematic structural diagram of an annular elastic body in the planar power resistor with simple assembly according to the present invention.
Detailed Description
The present invention is further described in detail below with reference to the drawings and examples so that those skilled in the art can practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
As shown in fig. 1 to 9, the present invention provides a planar power resistor which is easy to assemble, including: casing 1 and resistance chip 2, be connected through elastic layer 3 between resistance chip 2's the top surface and the casing 1, resistance chip 2's side and 1 joint of casing, elastic layer 3 makes resistance chip 2 spacing removal in casing 1.
The working principle and the beneficial effects of the technical scheme are as follows: the elastic layer 3 is made of silicon rubber, and the first forming mode can be that the elastic layer is formed on the top surface of the resistor chip 2 in advance when the resistor chip 2 is manufactured; when the manufactured resistor chip 2 is assembled with the shell 1, the resistor chip 2 is only required to be inserted into a cavity of the shell 1, the elastic layer 3 can be elastically abutted against the inner top surface of the shell 1, the resistor chip 2 is clamped with the shell 1, and the bottom surface of the mounted resistor chip 2 protrudes out of the bottom surface of the shell 1; the clamping connection between the resistance chip 2 and the shell 1 can prevent the resistance chip 2 from being separated from the shell 1, and meanwhile, when the bottom surface of the resistance chip 2 is pushed inwards by external force, the resistance chip 2 can move into the shell 1;
therefore, when the planar power resistor is installed, the planar power resistor and the plane capable of radiating are installed generally by utilizing screws, then along with the locking of the screws, extrusion force is formed on the bottom surface of the resistance chip 2, and the elastic layer 3 is compressed between the top surface of the resistance chip 2 and the inner top surface of the shell 1, so that the bottom surface of the resistance chip 2 is abutted to the plane elastic capable of radiating, and is in close contact with the bottom surface of the resistance chip 2, a gap is prevented from being formed between the bottom surface of the resistance chip 2 and the inner top surface of the shell 1, so that when the planar power resistor works, the radiating performance of the planar power resistor can be improved, the convenience in assembling the resistance chip 2 and the shell 1 is ensured, and the elastic layer 3 is made of silicon rubber, so that the planar power resistor has good heat resistance and heat conduction performance, and the radiating effect is further improved.
In one embodiment, the top surface of the housing 1 is provided with a first mounting groove 133, the first mounting groove 133 is provided with a pin sheet 4, and the pin 210 of the resistor chip 2 is connected between the pin sheet 4 and the first mounting groove 133 after passing through the housing 1.
The working principle and the beneficial effects of the technical scheme are as follows: pin 210 on resistance chip 2 need pass casing 1 and be connected with pin piece 4, and pin piece 4 is installed on casing 1, in order to further promote the installation of pin piece 4, and the convenience that pin piece 4 and pin 210 are connected, can make pin 210 pass casing 1 back joint between pin piece 4 and first mounting groove 133, make pin 210 and pin piece 4 in close contact with, thereby save pin piece 4 and pin 210 welded step, after the joint was accomplished, utilize insulating cement to fix between the opening of first mounting groove 133 and pin piece 4.
In one embodiment, the resistive chip 2 includes: the heat dissipation plate comprises a heat dissipation plate 220, a metal layer 230, a ceramic plate 240 and electrodes 250 which are arranged in sequence from bottom to top, wherein a resistance layer 260 is arranged between the two electrodes 250, pins 210 are connected onto the electrodes 250, a protective layer 270 covers part of the surfaces of the two electrodes 250 and the surface of the resistance layer 260, and an elastic layer 3 covers the other part of the surfaces of the two electrodes 250 and the surface of the protective layer 270.
The working principle and the beneficial effects of the technical scheme are as follows: the protective layer 270 is formed by glass paste, and has an isolation protection function on the surfaces of the resistive layer 260 and a part of the electrodes 250, and the elastic layer 3 is formed on the surfaces of the protective layer 270 and the electrodes 250 after the pins 210 are welded, and is used for elastic abutment between the resistive chip 2 and the housing 1.
In one embodiment, the top surface of the housing 1 is provided with separating grooves 110, separating grooves 120 are formed between adjacent separating grooves 110, a protruding block 130 is arranged in the separating groove 110, one end of the top surface of the protruding block 130 is sequentially provided with a nut mounting hole 131 for mounting a nut and a through hole 132 for allowing a pin 210 of the resistor chip 2 to pass through from top to bottom, the other end of the top surface of the protruding block 130 is provided with a first mounting groove 133 for being clamped with a pin sheet 4, a connecting groove 134 is communicated between the first mounting groove 133 and the nut mounting hole 131, and the pin 210 is connected with the pin sheet 4.
The working principle and the beneficial effects of the technical scheme are as follows: a certain distance is formed between the separation grooves 110 and the bumps 130, and the isolation grooves 120 are formed between adjacent separation grooves 110, so that the creepage distance between the pins 210 of the resistor chip 2 is increased, and the service life is prolonged;
furthermore, four separating grooves 110 are arranged and respectively distributed at four corners of the top of the housing 1, the nut mounting holes 131 are arranged close to the corners, if the separating grooves 110 are rectangular, two separating grooves 110 arranged at opposite corners of the top surface of the housing 1 and the structure formed in the separating grooves 110 are centrosymmetric, and the long sides of two separating grooves 110 arranged at two adjacent corners of the top surface of the housing 1 are perpendicular to each other, so as to reduce the volume of the resistor;
the nut mounting hole 131 and the through hole 132 are sequentially arranged at one end of the top surface of the bump 130, the first mounting groove 133 is arranged at the other end of the top surface, when mounting is carried out, the pin 210 penetrates through the through hole 132, then the pin is inserted into the first mounting groove 133 from the communicating groove 134, the nut is fixed in the nut mounting hole 131, and then the pin piece 4 is inserted into the first mounting groove 133, so that the pin 210 is clamped between the first mounting groove 133 and the pin piece 4, and stable connection of the pin 210 and the pin piece 4 is realized; after the connection, the pin sheet 4 cannot be separated from the first mounting groove 133, so that the subsequent coating of the insulating glue at the opening of the first mounting groove 133 is facilitated, and the pin sheet 4 is fixed in the first mounting groove 133.
In one embodiment, the lead sheet 4 includes: stationary blade 410 and connection piece 420, be equipped with notch 411 on the stationary blade 410, notch 411 department is equipped with flexure strip 430, flexure strip 430 to keeping away from connection piece 420 lopsidedness setting, and form the contained angle between the stationary blade 410, the one side that the connection piece 420 was kept away from to flexure strip 430 is equipped with bulge 431.
The bottom end of the elastic sheet 430 is provided with a first arc-shaped groove 432.
A second arc-shaped groove 135 is formed in one side of the first mounting groove 133 away from the nut mounting hole 131.
Neither the first arcuate slot 432 nor the second arcuate slot 135 have a depth greater than the radius of the pin 210.
The working principle and the beneficial effects of the technical scheme are as follows: before the pin sheet 4 is not installed, the elastic sheet 430 inclines to one side far away from the connecting sheet 420, when the pin sheet 4 is installed, the elastic sheet 430 moves to one side close to the connecting sheet 420 by using external force to reduce the included angle between the elastic sheet and the fixing sheet 410, then the fixing sheet 410 and the elastic sheet 430 are inserted into the first installation groove 133, before the pin 210 is placed at the second arc-shaped groove 135 in the first installation groove 133, after the pin sheet 4 is completely inserted, the elastic sheet 430 is limited by the first installation groove 133 and elastically abuts against the first installation groove 133, meanwhile, the pin 210 is clamped between the first installation groove 133 and the elastic sheet 430, namely, the bottom of the elastic sheet 430 and the first installation groove 133 and the bulge 431 and the first installation groove 133 are in tight contact with the pin 210, and because the depths of the first arc-shaped groove 432 and the second arc-shaped groove 135 are not larger than the radius of the pin 210, only the limiting effect is achieved, the pin sheet 4 can be fully abutted against the pin 210, and the stability of connection is ensured;
due to the arrangement of the elastic piece 430, the pin piece 4 can be clamped in the first mounting groove 133 through the elastic acting force of the elastic piece when being mounted, and is tightly connected with the pin 210, so that the pin piece 4 cannot be separated from the first mounting groove 133 under the action of external force, the insulating glue can be coated at the opening of the first mounting groove 133 conveniently, and the position of the pin piece 4 is prevented from being deviated;
due to the arrangement of the elastic pieces 430 on the pin sheet 4, the convenience and stability of installation of the pin sheet 4 and connection of the pin sheet 4 and the pins 210 are improved, and the assembly efficiency is further improved.
In one embodiment, the side surface of the resistor chip 2 is clamped with the shell 1 through a clamping piece 5;
the medial surface bottom of casing 1 is equipped with the second mounting groove 140 that is used for installing joint spare 5, the side bottom of resistance chip 2 is equipped with spacing groove 221, spacing groove 221 is used for preventing resistance chip 2 to remove to its bottom direction, and when resistance chip 2 received external force, makes resistance chip 2 can remove to its top direction.
The working principle and the beneficial effects of the technical scheme are as follows: joint 5 can block joint to in second mounting groove 140, and the one end that joint 5 protrusion second mounting groove 140 set up is used for the spacing groove 221 joint that sets up with resistance chip 2's heating panel 220 side, when installing resistance chip 2, at first under the extrusion of heating panel 220, the convex one end of joint 5 is compressed, when the installation targets in place, the convex one end of joint 5 inserts the top to spacing groove 221 under the elastic recovery effort, make resistance chip 2 can not deviate from in the casing 1 from this, and the setting of spacing groove 221 can also make resistance chip 2 receive external force at the installation resistor when, remove to the top direction of resistance chip 2, so that elastic layer 3 is compressed.
In one embodiment, the clip 5 includes: a U-shaped main body 510, wherein one end of the U-shaped main body 510 extends to form a first clamping portion 520, the other end of the U-shaped main body 510 extends to form a second clamping portion 530, and the second clamping portion 530 extends to the outside of the second mounting groove 140 and is clamped with the limiting groove 221;
the top surface of the second mounting groove 140 is provided with a first clamping groove 141 corresponding to the first clamping portion 520, and the bottom surface of the second mounting groove 140 is provided with a third arc-shaped groove 142 corresponding to the U-shaped main body 510.
The working principle and the beneficial effects of the technical scheme are as follows: the U-shaped main part 510 of joint spare 5 is elastic setting, insert joint spare 5 from the opening part of second mounting groove 140, make the arc end of U-shaped main part 510 place in third arc wall 142, make first joint portion 520 place in first draw-in groove 141, the one end that third arc wall 142 is close to heating panel 220 forms thrust to U-shaped main part 510, and first joint portion 520 receives the spacing of first draw-in groove 141, thereby connect joint spare 5 spacing in second mounting groove 140, and second joint portion 530 protrusion sets up in second draw-in groove 140, when inserting resistance chip 2 to casing 1 in, heating panel 220 at first forms inward thrust to second joint portion 530, make U-shaped main part 510 compress, and when spacing groove 221 moved to target in place, under the elastic restoring force of U-shaped main part 510, second joint portion 530 joint is to spacing groove 221 in, realize the joint of resistance chip 2 and casing 1.
In one embodiment, the limiting groove 221 includes: a second card slot 2211 corresponding to the second card connecting portion 530, a pushing groove 2212 is arranged below the second card slot 2211, one side of the pushing groove 2212 far away from the second mounting groove 140 is an inclined plane, and the depth of one end of the pushing groove 2212 close to the second card slot 2211 is greater than that of the other end thereof.
The working principle and the beneficial effects of the technical scheme are as follows: the second card slot 2211 is used for being connected with the second card portion 530 in a clamping mode, the top surface of the second card slot 2211 is a plane, the bottom surface of the second card slot 2211 is an inclined surface, and the inclined surface corresponds to the second card portion 530, and the inclined surface of the second card slot 2211 is connected with the inclined surface of the pushing and pressing slot 2212, therefore, when the resistor chip 2 tends to move downwards, the top surface of the second card slot 2211 can be limited by the second card portion 530, the resistor chip 2 is prevented from moving downwards, when the resistor chip 2 tends to move upwards, the second card portion 530 can transit to the pushing and pressing slot 2212 along the inclined surface of the second card slot 2211, and the pushing and pressing slot 2212 has larger thrust to the second card portion 530 along with the larger upward movement distance of the resistor chip 2, so that the elastic restoring acting force of the U-shaped main body 510 is larger, and the resistor chip 2 is closer to the surface which can radiate heat.
In addition, as for the second forming mode of the elastic layer 3, after the resistor chip 2 and the housing 1 are assembled, silicone rubber is injected between the top surface of the resistor chip 2 and the housing 1 through the glue injection hole on the top surface of the housing 1 to form the elastic layer 3, and in the glue injection process, the assembly position of the resistor chip 2 and the housing 1 can be limited by the cooperation of the clamping piece 5 and the limiting groove 221, that is, the second clamping portion 530 of the clamping piece 5 is limited in the second clamping groove 2211, so that enough space area glue injection can be left between the top surface of the resistor chip 2 and the housing 1, and therefore, after the glue injection is completed, the elastic layer 3 is formed in the space area; therefore, the cooperation of joint spare 5 and spacing groove 221 can make things convenient for the reservation of injecting glue spatial zone, makes things convenient for the formation of elastic layer 3.
In one embodiment, the two opposite sides of the bottom end of the housing 1 are extended outwards to form mounting plates 6, and the bottom end of the heat dissipation plate 220 is protruded from the bottom surface of the mounting plates 6;
the inner side of the shell 1 is provided with a first step surface 150, the first step surface 150 is located above the clamping position of the resistor chip 2 and the shell 1, a groove 151 is formed in the first step surface 150, an annular elastic body 7 is arranged in the groove 151, and one side of the annular elastic body 7 protruding out of the first step surface 150 is abutted to a second step surface 222 formed on the heat dissipation plate 220.
The working principle and the beneficial effects of the technical scheme are as follows: the shell 1 and the mounting plate 6 are integrally formed by injection molding, and the mounting plate 6 is provided with a mounting hole for connecting with a plane capable of dissipating heat through a screw;
in addition, in order to ensure the sealing performance of the resistor chip 2 and the housing 1, the annular elastic body 7 is arranged between the first step surface 150 and the second step surface 222 in a pressing mode, so that the sealing protection effect is achieved, and meanwhile elastic supporting force is provided for the resistor chip 2.
The invention also provides a production process of the planar power resistor, which is simple and convenient to assemble, and comprises the following steps:
s100, printing sintering electrodes 250 on two sides of the top surface of the ceramic sheet 240, and printing a sintering metal layer 230 on the bottom surface of the ceramic sheet 240;
s200, printing a sintered resistance layer 260 on the top surface of the ceramic sheet 240, connecting the resistance layer 260 between two electrodes 250, and correcting the resistance of the formed resistance layer 260;
s300, printing a sintering protective layer 270 on partial surfaces of the two electrodes 250 and the surface of the resistor layer 260;
s400, welding a heat dissipation plate 220 on the metal layer 230 on the bottom surface of the ceramic plate 240, and welding pins 210 on the electrode 250 on the top surface of the ceramic plate 240 to form a resistor chip 2;
s500, before or after the resistor chip 2 and the manufactured shell 1 are assembled, forming an elastic layer 3 on the other partial surfaces of the two electrodes 250 and the surface of the protective layer 270;
before the resistor chip 2 is assembled with the manufactured housing 1, the other part of the surfaces of the two electrodes 250 and the surface of the protective layer 270 are coated with silicon rubber to form the elastic layer 3; or after the resistor chip 2 and the manufactured shell 1 are assembled, injecting silicon rubber into a space region formed between the resistor chip 2 and the shell 1 through an injection hole in the top surface of the shell 1 to form an elastic layer 3;
s600, after the resistor chip 2 and the manufactured shell 1 are assembled, the pins 210 are connected with the pin pieces 4, and the pin pieces 4 are fixed with the shell 1.
The working principle and the beneficial effects of the technical scheme are as follows: steps S100 to S400 are processes of manufacturing the resistor chip 2, and step S500 is two ways of forming the elastic layer 3, the first way is to coat silicon rubber to form the elastic layer 3, and this way needs to control the thickness of the elastic layer 3 to ensure that the elastic layer 3 can be fully contacted with the housing 1 during installation, thereby ensuring heat dissipation performance; the second method is to inject silicone rubber into the elastic layer 3 after the elastic layer is assembled with the housing 1, and this method requires the cooperation of the clip 5 and the limiting groove 221 to reserve a space area for injecting glue, so as to ensure the stable formation of the elastic layer 3.
In one embodiment, in S200, the resistance value of the formed resistive layer 260 is corrected by using a laser, wherein an operating parameter of the laser is determined by the following steps:
s210, determining laser pulse energy according to a preset temperature of the laser acting on the surface of the resistance layer 260;
the laser pulse energy is determined by the following formula:
wherein, T y A predetermined temperature, T, for the laser to act on the surface of the resistive layer 260 0 Is the temperature of the resistive layer 260 in a room temperature state, μ is a temperature drop coefficient, E is laser pulse energy, R is a thermal conduction diffusion radius, C is a specific heat capacity of the resistive layer 260, ρ is a density of the resistive layer 260,
t is the time that the laser light acts on the resistive layer 260, exp () is an exponential function with e as the base;
and S220, determining the power and frequency of the laser according to the determined laser pulse energy.
The working principle and the beneficial effects of the technical scheme are as follows: in the prior art, the resistance value is usually adjusted by forming an incision on the surface of the resistive layer 260 with laser;
when a continuous laser is selected for resistance adjustment, the determination of laser working parameters adopts a formula I: average power of the laser = laser pulse energy repetition frequency (number of laser pulses per second); when a pulse laser is selected for resistance adjustment, the laser working parameters are determined by adopting a formula II: peak power of the laser = laser pulse energy/pulse width;
when the laser is used for resistance adjustment, the power and the frequency of the laser have a large influence on the accuracy of the resistance adjustment, the power of the laser is increased when the frequency is increased, the resistance adjustment accuracy is reduced when the resistance change rate of the resistance layer 260 is influenced by the laser cutting groove when the power of the laser is higher, and the surface of the resistance layer 260 is easily cracked at the moment when the resistance layer is focused on the surface of the resistance layer 260 under the condition of overhigh laser power, so that the resistance layer 260 is damaged; when the frequency is too low, the intensity of the laser is insufficient; therefore, the frequency and power of the laser should be selected in consideration of the consistency of the energy of the laser pulse, so that the consistency of the thickness and width of the cutting groove is ensured when the laser cuts the cutting groove on the resistance layer 260 for resistance adjustment, and the resistance adjustment precision is improved;
therefore, in the above manner, considering that the temperature applied to the surface of the resistive layer 260 needs to be kept consistent when the laser cuts the groove, the temperature applied to the surface of the resistive layer 260 by the laser is set to the preset temperature, and the laser pulse energy is determined by the formula in step S210, thereby ensuring the consistency of the laser pulse energy; a temperature reduction coefficient is introduced into the formula, wherein the temperature reduction coefficient represents a coefficient for reducing the temperature (gas cooling can be adopted) of the laser acting on the surface of the resistance layer 260 when the laser resistance adjustment is carried out, so that the generation of cracks caused by the rapid change of the surface temperature of the resistance layer 260 is prevented, and the consistency of the temperature of the laser acting on the surface of the resistance layer 260 is further ensured; after the laser pulse energy is determined, appropriate laser frequency and power can be correspondingly selected according to the type of the used laser;
the laser applied to the surface of the resistive layer 260 is cooled, a gas is introduced to the surface of the resistive layer 260, the cooling coefficient can be obtained through experiments, the cooling coefficient = the temperature of the laser applied to the surface of the resistive layer 260 after the gas is introduced/the temperature of the laser applied to the surface of the resistive layer 260 when the gas is not introduced, and the introduced gas can effectively reduce the probability of cracks generated in the resistive layer 260;
by the method, the precision of laser resistance trimming can be improved, damage to the resistance layer 260 caused by laser in the resistance trimming process is avoided, and the production efficiency is further improved.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
While embodiments of the invention have been disclosed above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (10)
1. A planar power resistor that is simple to assemble, comprising: casing (1) and resistance chip (2), be connected through elastic layer (3) between the top surface of resistance chip (2) and casing (1), the side and casing (1) joint of resistance chip (2), elastic layer (3) make resistance chip (2) spacing removal in casing (1).
2. The planar power resistor with simple assembly as claimed in claim 1, wherein the top surface of the housing (1) is provided with a first mounting groove (133), the first mounting groove (133) is internally provided with a pin sheet (4), and the pin (210) of the resistor chip (2) is connected between the pin sheet (4) and the first mounting groove (133) after passing through the housing (1).
3. An easy-to-assemble planar power resistor according to claim 1, characterized in that the resistive chip (2) comprises: the electrode structure comprises a heat dissipation plate (220), a metal layer (230), a ceramic plate (240) and electrodes (250) which are sequentially arranged from bottom to top, wherein a resistance layer (260) is arranged between the two electrodes (250), pins (210) are connected onto the electrodes (250), protective layers (270) cover part of surfaces of the two electrodes (250) and the surface of the resistance layer (260), and elastic layers (3) cover the other part of surfaces of the two electrodes (250) and the surface of the protective layer (270).
4. The planar power resistor easy to assemble according to claim 2, wherein the top surface of the housing (1) is provided with separating grooves (110), the separating grooves (120) are formed between adjacent separating grooves (110), a bump (130) is arranged in each separating groove (110), one end of the top surface of each bump (130) is sequentially provided with a nut mounting hole (131) for mounting a nut and a through hole (132) for allowing a pin (210) of the resistor chip (2) to pass through from top to bottom, the other end of the top surface of each bump (130) is provided with a first mounting groove (133) for being clamped with the pin sheet (4), a connecting groove (134) is communicated between the first mounting groove (133) and the nut mounting hole (131), and the pin (210) is connected with the pin sheet (4).
5. An easy-to-assemble planar power resistor according to claim 4, characterized in that the pin sheet (4) comprises: stationary blade (410) and connection piece (420), be equipped with notch (411) on stationary blade (410), notch (411) department is equipped with flexure strip (430), flexure strip (430) set up to the lopsidedness of keeping away from connection piece (420), and with form the contained angle between stationary blade (410), the one side that connection piece (420) were kept away from in flexure strip (430) is equipped with bulge (431).
6. The planar power resistor easy to assemble according to claim 1, wherein the side surface of the resistor chip (2) is clamped with the housing (1) through a clamping piece (5);
the utility model discloses a resistance chip, including casing (1), medial surface bottom of casing (1) is equipped with second mounting groove (140) that are used for installing joint spare (5), the side bottom of resistance chip (2) is equipped with spacing groove (221), spacing groove (221) are used for preventing resistance chip (2) to remove to its bottom direction, and when resistance chip (2) received external force, make resistance chip (2) can remove to its top direction.
7. An easy-to-assemble planar power resistor according to claim 6, characterized in that the snap-in (5) comprises: the U-shaped mounting groove comprises a U-shaped main body (510), wherein a first clamping portion (520) extends from one end of the U-shaped main body (510), a second clamping portion (530) extends from the other end of the U-shaped main body (510), and the second clamping portion (530) extends to the outside of the second mounting groove (140) and is clamped with a limiting groove (221);
the top surface of second mounting groove (140) is equipped with first draw-in groove (141) that correspond with first joint portion (520), the bottom surface of second mounting groove (140) is equipped with third arc wall (142) that correspond with U-shaped main part (510).
8. An easy-to-assemble planar power resistor according to claim 7, wherein the limiting groove (221) comprises: second draw-in groove (2211) that corresponds with second joint portion (530), the below of second draw-in groove (2211) is equipped with pushes away pressing groove (2212), the one side that second mounting groove (140) was kept away from in pushing away pressing groove (2212) is the inclined plane, the one end degree of depth that pushes away pressing groove (2212) is close to second draw-in groove (2211) is greater than its other end degree of depth.
9. The planar power resistor with simple assembly as claimed in claim 3, wherein the housing (1) is provided with mounting plates (6) extending outwards from two opposite sides of the bottom end thereof, and the bottom end of the heat dissipation plate (220) is arranged to protrude from the bottom surface of the mounting plates (6);
casing (1) inboard is equipped with first step face (150), first step face (150) are located the top that resistance chip (2) and casing (1) joint position, be equipped with recess (151) on first step face (150), be equipped with annular elastomer (7) in recess (151), one side and the heating panel (220) of the first step face of annular elastomer (7) protrusion second step face (222) butt that forms on one side of (150) and the heating panel (220).
10. A process for producing an easily assembled planar power resistor according to any of claims 1-9, comprising:
s100, printing sintering electrodes (250) on two sides of the top surface of the ceramic wafer (240), and printing a sintering metal layer (230) on the bottom surface of the ceramic wafer (240);
s200, printing a sintered resistance layer (260) on the top surface of the ceramic sheet (240), connecting the resistance layer (260) between two electrodes (250), and correcting the resistance value of the formed resistance layer (260);
s300, printing a sintering protection layer (270) on partial surfaces of the two electrodes (250) and the surface of the resistance layer (260);
s400, welding a heat dissipation plate (220) on the metal layer (230) on the bottom surface of the ceramic plate (240), and welding pins (210) on the electrode (250) on the top surface of the ceramic plate (240) to form a resistor chip (2);
s500, before or after the resistor chip (2) and the manufactured shell (1) are assembled, forming an elastic layer (3) on the other partial surfaces of the two electrodes (250) and the surface of the protective layer (270);
s600, after the resistor chip (2) and the manufactured shell (1) are assembled, the pins (210) are connected with the pin sheets (4), and the pin sheets (4) are fixed with the shell (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310198664.2A CN115985598A (en) | 2023-03-03 | 2023-03-03 | Plane power resistor easy and convenient to assemble and production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310198664.2A CN115985598A (en) | 2023-03-03 | 2023-03-03 | Plane power resistor easy and convenient to assemble and production process |
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| Publication Number | Publication Date |
|---|---|
| CN115985598A true CN115985598A (en) | 2023-04-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310198664.2A Withdrawn CN115985598A (en) | 2023-03-03 | 2023-03-03 | Plane power resistor easy and convenient to assemble and production process |
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| CN (1) | CN115985598A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116936211A (en) * | 2023-08-15 | 2023-10-24 | 广东正鸿电子科技有限公司 | Planar thick film power resistor and production process thereof |
-
2023
- 2023-03-03 CN CN202310198664.2A patent/CN115985598A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116936211A (en) * | 2023-08-15 | 2023-10-24 | 广东正鸿电子科技有限公司 | Planar thick film power resistor and production process thereof |
| CN116936211B (en) * | 2023-08-15 | 2024-01-30 | 广东正鸿电子科技有限公司 | Planar thick film power resistor and production process thereof |
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