CN206779678U - Locating piece and ratio-frequency welding inductor - Google Patents
Locating piece and ratio-frequency welding inductor Download PDFInfo
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- CN206779678U CN206779678U CN201720350408.0U CN201720350408U CN206779678U CN 206779678 U CN206779678 U CN 206779678U CN 201720350408 U CN201720350408 U CN 201720350408U CN 206779678 U CN206779678 U CN 206779678U
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- Prior art keywords
- locating piece
- ratio
- inductor
- frequency welding
- concave arc
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Abstract
Parts of Compressor assembling process technique field is the utility model is related to, discloses a kind of locating piece and ratio-frequency welding inductor.The locating piece is used to be arranged on ratio-frequency welding inductor, concave arc surface (1) of the locating piece formed with the outer lower face for supporting and protecting toroidal inductor.Because the locating piece can be assemblied on ratio-frequency welding inductor, and there is concave arc surface, so, after the locating piece and the assembling of ratio-frequency welding inductor, the outer lower face of the toroidal inductor of ratio-frequency welding inductor can be supported on concave arc surface and be protected by the concave arc surface, in welding, locating piece will contact with the lower house edge of compressor, the part of toroidal inductor and compressor is avoided directly to contact, so as to carry out effectively protection to the position easy to wear of toroidal inductor to significantly reduce the abrasion of ring sensor coil, so as to improve the service life of ratio-frequency welding inductor.
Description
Technical field
Parts of Compressor assembling process technique field is the utility model is related to, in particular it relates to a kind of locating piece and one
Kind ratio-frequency welding inductor.
Background technology
The totally-enclosed compressor pump housing used in refrigerator is placed in inside the lower house of compressor, and compressor is from lower house air-breathing
Pipe sucks low temperature low pressure gas, is operated by motor after being compressed with piston to it, and HTHP is discharged to blast pipe
Refrigerant gas, power is provided for kind of refrigeration cycle, so as to realize the kind of refrigeration cycle of compression → condensation → expansion → evaporation.
The part of each connection is both needed to seal inside compressor, compressor by the connection of inside exhaust pipe and outer blast pipe come
Realize that compressor inside and outside connects, specifically, inside exhaust pipe insertion end can be inserted into outer blast pipe, then internally arranged
The junction of tracheae and outer blast pipe is welded, but traditional handicraft is uncontrollable using oxygen and acetylene torch holding time,
The quality risk of disconnected pipe will be caused when adapter to be welded is by burning, and it is uncontrollable to weld slip, and will to operator technical ability
Ask higher, be also easy to produce gas exhaust piping rosin joint, the stifled phenomenon of weldering, so as to cause refrigerant finally to lead in the obstructed of cooling cycle system
Cause is not freezed.
Therefore, there is a kind of high-frequency welding technology, high-frequency welding technology has that safe, skill set requirements are low, are welded into
The advantages that this low and welding uniformity is good.However, ratio-frequency welding is there is also the shortcomings that itself, such as：Due to induction coil often with
The internal part of compressor is contacted and is prone to wear out, and this make it that the inductor life-span is relatively low；In addition, high-frequency welding to welding position compared with
For sensitivity, weld the accuracy of relative position influences very big on welding uniformity, and then needs by welding people in the prior art
Member ensures to weld the accuracy of relative position manually.
Utility model content
The utility model provides a kind of locating piece, and the locating piece can have to the position easy to wear of toroidal inductor
Effect protection is to significantly reduce the abrasion of ring sensor coil, so as to improve the service life of ratio-frequency welding inductor.
To achieve these goals, the utility model provides a kind of locating piece, and the locating piece is used to be arranged on ratio-frequency welding
On inductor, concave arc surface of the locating piece formed with the outer lower face for supporting and protecting toroidal inductor.
In locating piece provided by the utility model, because the locating piece can be assemblied on ratio-frequency welding inductor, and have
There is concave arc surface, so, after the locating piece and the assembling of ratio-frequency welding inductor, outside the toroidal inductor of ratio-frequency welding inductor
Lower surface can be supported on concave arc surface and be protected by the concave arc surface, welding when, locating piece will and compressor
The contact of lower house edge, avoid the part of toroidal inductor and compressor from directly contacting, so as to toroidal inductor
Position easy to wear effectively protect to significantly reduce the abrasion of ring sensor coil, so as to improve making for ratio-frequency welding inductor
Use the life-span.
Further, the locating piece includes plane plate, is integrally extended with the side outward flange of the plane plate
Arched arm, wherein, difference in height between the concave arc surface of the arched arm and the plane plate be present, and be tangential on described recessed
The plane of the minimum point of arcwall face is parallel with the plate face of the plane plate.
Further, formed with two spaced apart arched arms on the plane plate, wherein, described in two
Formed with lolling between arched arm, the front end face to loll formed with for contacting the outer surface of adapter to be welded to be treated to described
The arcs of recesses locating surface that welded pipe is positioned.
Further, the plate face of the lingual surface to loll and the plane plate flushes.
In addition, the utility model provides a kind of ratio-frequency welding inductor, the ratio-frequency welding inductor includes having induction coil
The body of body and any of the above-described described locating piece, wherein, the line of induction circle body includes toroidal inductor, the locating piece
Connect on the body, and the outer lower face of the toroidal inductor is located in the concave arc surface.
So, as described above, by protection of the concave arc surface to toroidal inductor, in welding, locating piece will be with
The lower house edge contact of compressor, avoids the part of toroidal inductor and compressor from directly contacting, so as to toroidal inductive
The position easy to wear of coil carries out effectively protection to significantly reduce the abrasion of ring sensor coil, so as to improve ratio-frequency welding sensing
The service life of device.
Further, the toroidal inductor includes two parallel interval arrangements and the coil connected by connecting portion
Portion, and each coil portion is located in the respective concave arc surface.
Further, conducting magnet core is provided with the intermediate space that each coil portion is formed.
Further, the line of induction circle body is formed by a copper pipe bending.
Further, covered with insulating barrier on the outer surface of the toroidal inductor.
Further, the line of induction circle body includes straight length, wherein, the locating piece and the straight length are fixed and connected
Connect.
Further, the body includes installing plate and two conductions being disposed in the plate face of the installing plate
Pipe, wherein, the line of induction circle body connects with the contact tube.
Further, the insulating barrier being provided with the plate face of the installing plate between two contact tubes.
Further, formed with cooling duct in the induction coil body, wherein, the cooling duct and the contact tube
Pipe internal channel be connected, it is and formed with the water inlet communicated with a contact tube on the installing plate and conductive with another
The delivery port that pipe communicates.
Brief description of the drawings
Fig. 1 is a kind of dimensional structure diagram for the locating piece that specific embodiment of the present utility model provides；
Fig. 2 is that the stereochemical structure at a visual angle of the ratio-frequency welding inductor that specific embodiment of the present utility model provides is shown
It is intended to；
Fig. 3 is the stereochemical structure at another visual angle of the ratio-frequency welding inductor that specific embodiment of the present utility model provides
Schematic diagram；
Fig. 4 is the stereochemical structure signal for the ratio-frequency welding inductor weld job that specific embodiment of the present utility model provides
Figure；
Fig. 5 is the close-up schematic view of Fig. 4 plan structure；
Fig. 6 is the close-up schematic view of Fig. 4 front view structure；
Fig. 7 is the spiral shape weld-ring used in Fig. 4 weld job.
Description of reference numerals
1- concave arc surfaces, 2- plane plates, 3- arched arms, 4- loll, 5- arcs of recesses locating surfaces, 6- line of induction circle bodies, 7-
Body, 8- locating pieces, 9- toroidal inductors, 10- connecting portions, 11- coil portions, 12- conducting magnet cores, 13- straight lengths, 14- peaces
Loading board, 15- contact tubes, 16- insulating barriers, 17- water inlets, 18- delivery ports, 19- connection spiral shell blocks, 20- connecting bolts, 21- spiral shells
Revolve shape weld-ring, 22- inside exhaust pipes, the outer blast pipes of 23-, 24- lower houses.
Embodiment
Specific embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.It should be appreciated that herein
Described embodiment is merely to illustrate and explained the utility model, is not limited to the utility model.
Structure with reference to shown in Fig. 1 and 2, locating piece 8 provided by the utility model are used to be arranged on ratio-frequency welding inductor,
Concave arc surface 1 of the locating piece 8 formed with the outer lower face for supporting and protecting toroidal inductor.
In the technical scheme, because the locating piece 8 can be assemblied on ratio-frequency welding inductor, with reference to shown in figure 2 and 3
Structure, and there is concave arc surface 1, so, after the locating piece 2 and the assembling of ratio-frequency welding inductor, the ring of ratio-frequency welding inductor
The outer lower face of shape induction coil can be supported on concave arc surface and be protected by the concave arc surface 1, it is specific such as Fig. 2 and
Shown in 3, in welding, locating piece 8 contacts the edge of the lower house with compressor, avoids toroidal inductor and compressor
Part directly contact, so as to carry out effectively protection to the position easy to wear of toroidal inductor to significantly reduce ring sensor
The abrasion of coil, so as to improve the service life of ratio-frequency welding inductor.
Certainly, on the locating piece 8, concave arc surface 1 can be formed by diversified forms, for example, can be directly fixed
It is downwardly concaved on the block face of position block 8 to form concave arc surface 1.Or as shown in Figure 1, it is preferable that locating piece includes surface plate
Body 2, arched arm 3 is integrally extended with the side outward flange of plane plate 2, wherein, the concave arc surface 1 and surface plate of arched arm 3
Difference in height between body 2 be present, and the plane for being tangential on the minimum point of concave arc surface 1 is parallel with the plate face of plane plate, with shape
Into this structure as shown in Figure 1.So, as shown in Fig. 2 coil portion 11 also will correspondingly sink when being located in concave arc surface 1
Certain depth so that the ratio-frequency welding inductor including the locating piece can apply to the outer blast pipe loudspeaker mouth of pipe relative to compressor
The relatively low compressor in the edge of lower house 24, so as to which the coil portion 11 to sink makes heating location be predominantly located at below the loudspeaker mouth of pipe,
So melt the spiral shape weld-ring that is placed in advance in loudspeaker by the heat transfer of the loudspeaker mouth of pipe to weld inside exhaust pipe and outer
Blast pipe, it reduce the impaired risk of the heated thawing of the narrower portion of the inside exhaust pipe above outer blast pipe, burn-through, intensity.
Further, in order to fully weld, and operating personnel's hand is avoided to the relative position of welding is precisely located simultaneously
The dynamic Relatively orientation to welding, it is preferable that structure as shown in Figure 1, it is spaced apart formed with two on plane plate 2
Arched arm 3, wherein, formed with lolling 4 between two arched arms 3, loll 4 front end face formed with for contacting adapter to be welded
Outer surface is to treat the arcs of recesses locating surface 5 that welded pipe is positioned.So, it is as shown in Figure 5, include the high frequency of the locating piece
After weldering inductor is placed on lower shells of compressors edge, the outer peripheral face of outer blast pipe 23 will be connected to the arcs of recesses locating surface 5
Interior, so as to playing the positioning in direction up and down in the graphical interfaces shown in Fig. 5, and the lower surface of locating piece is placed in when welding
On lower house edge, the positioning of above-below direction is played in the graphical interfaces shown in Fig. 6, it is, being provided with the locating piece
For ratio-frequency welding inductor in welding, operator simultaneously need not manually adjust welding position again, and lifting is welded beat and welding by this
Quality, it also reduce further required operation skill.
Certainly, loll 4 can also keep level is to form horizontal part again after sinking as arched arm 3, and arcs of recesses is determined
Plane 5 can be then formed on the front end face of horizontal part.Or as shown in Figure 1, loll 4 lingual surface and the plate of plane plate 2
Face flushes, so as to be formed between two coil portions 11 reliable and stablely so that two coil portions 11 can position.
On the basis of above-mentioned any described locating piece 8, the utility model provides a kind of ratio-frequency welding inductor, reference chart
Structure shown in 2 and 3, the ratio-frequency welding inductor include body 7 and any of the above-described described locating piece with line of induction circle body 6
8, wherein, line of induction circle body 6 includes toroidal inductor 9, and locating piece 8 is connected on body 7, for example, as shown in Figure 2, it is fixed
Position block 8 can be connected on the straight length 13 of line of induction circle body 6, or, selectively, locating piece 8 can be connected to contact tube
On 15 front end face, as shown in Figures 2 and 3, locating piece 8 can be connected to and the outer lower face position of toroidal inductor 9
In in concave arc surface 1.
So, as described above, by protection of the concave arc surface 1 to toroidal inductor 9, in welding, locating piece 1 will
Contacted with the lower house edge of compressor, avoid the part of toroidal inductor 9 and compressor from directly contacting, so as to feel to annular
The position easy to wear of coil 9 is answered effectively protect to significantly reduce the abrasion of ring sensor coil 9, so as to improve ratio-frequency welding
The service life of inductor.
Further, as described above, the arcs of recesses positioning formed by 4 front end face that lolls on the locating piece 1
Face 5, it is as shown in Figure 5, including the locating piece ratio-frequency welding inductor be placed on lower shells of compressors edge after, outer blast pipe
23 outer peripheral face will be connected in the arcs of recesses locating surface 5, so as to play direction up and down in the graphical interfaces shown in Fig. 5
Positioning, and the lower surface of locating piece is placed on lower house edge when welding, and upper and lower is played in the graphical interfaces shown in Fig. 6
To positioning, it is, being provided with the ratio-frequency welding inductor of the locating piece in welding, operator need not simultaneously manually adjust again
Welding position, lifting is welded beat and welding quality, also reduce further required operation skill by this.
Further, for the ease of carrying out accurate fully welding to welding relative position, with being formed on plane plate 2
Two spaced apart arched arms 3 are corresponding, it is preferable that as shown in Fig. 2, Fig. 3 and Fig. 5, toroidal inductor 9 includes two
The coil portion 11 that parallel interval is arranged and connected by connecting portion 10, and each coil portion 11 is located at respective concave arc surface 1
It is interior.
So, first the spiral shape weld-ring 21 shown in Fig. 7 can be enclosed on the welding pipe end of inside exhaust pipe 22, then by
The welding pipe end of blast pipe 22 is inserted into the tubaeform nose end of outer blast pipe 23, and now, spiral shape weld-ring 21 will fall off
In horn mouth, as shown in figure 5, high frequency electric source flows to toroidal inductor 9 through portable hand-held transformer, high frequency electric is through two
High frequency magnetic field is produced during toroidal inductor 9, is in the tubaeform nose end of high-frequency heating center (as shown in Figure 6) by wink
Between heat high temperature, the instant melting under the bell-mouthed radiation effects of high temperature of the spiral shape weld-ring 21 in horn mouth, thawing
The infall that spiral shape weld-ring 21 is flowed between inside exhaust pipe 22 and tubaeform nose end carries out the filling of solder, to realize outer arrange
The welded seal of tracheae and inside exhaust pipe.
Further, conducting magnet core 12 is provided with the intermediate space that each coil portion 11 is formed, the conducting magnet core 12
Magnetic resistance very little, and density and the direction of magnetic flux can be controlled, reach the magnetic induction of increase coil portion 11, this poly- magnetic, which is guided into, to be treated
The purpose of welding assembly is to improve firing rate and efficiency, reduction weld interval, lifting process beat.
In addition, in order to lift magnetic field's regularity, and be easy to fabricate, it is preferable that as shown in Figure 2, induction coil
Body 6 can be bent to form by a copper pipe according to the structure shown in Fig. 2.
In addition, covered with insulating barrier, such as ceramic layer or rubber layer on the outer surface of toroidal inductor 9, to play
The effect of insulation protection, more improves security.For example, line of induction circle body 6 can be by a copper pipe according to the knot shown in Fig. 2
In the case of structure is to be bent to form, it is easier to the spray applied insulation on the outer surface of toroidal inductor 9.
In addition, it is as described above, for the ease of being located by connecting for locating piece 8, it is preferable that as shown in Figure 2, induction coil
Body 6 includes straight length 13, wherein, locating piece 8 is fixedly connected with straight length 13.For example, as shown in Figures 2 and 3, on straight length 13
Connection spiral shell block 19 is welded with, and connecting bolt 20 is threadedly coupled through locating piece with connecting spiral shell block 19.
In addition, it is above-mentioned it is any on the basis of, as shown in Figures 2 and 3, body 7 includes installing plate 14 and is disposed on
Two contact tubes 15 in the plate face of installing plate 14, such as copper pipe, wherein, line of induction circle body 6 and contact tube 15 connect.So,
Logical cooling water is to be cooled down among contact tube 15, it is ensured that contact tube 15 is at normal working condition, and contact tube 15
Body is then used to lead to high frequency electric.
Further, the insulating barrier 16 being provided with the plate face of installing plate 14 between two contact tubes 15, with
Two insulation of contact tube 15 are separated.
In addition, the high-frequency heating performance for answering coil case 6 for promotion feeling, it is preferable that formed with cooling in line of induction circle body 6
Passage, cooling duct is may be used as example, after the bending of copper pipe, inside it, wherein, in the pipe of cooling duct and contact tube 15
Passage is connected, and is communicated formed with the water inlet 17 communicated with a contact tube on installing plate 14 and with another contact tube
Delivery port 18.So, cooling water then flows through line of induction circle body 6 after water inlet 17 flows into a contact tube 15, then stream
Cross another contact tube 15 and flowed out from delivery port 18, be ground connection certainly, during flow of cooling water, so that it is guaranteed that electricity consumption
Safety.
As shown in figure 4, first spiral shape weld-ring 21 is inserted through the end of inside exhaust pipe 22, then by inside exhaust pipe before welding
Into bell-mouthed outer blast pipe 23, bell-mouthed outer blast pipe is arranged on lower shells of compressors 24.During welding positioning, high frequency
The toroidal inductor 9 of weldering inductor is extend into the lower house 24 of compressor, and the lower surface of locating piece 8 is placed under compressor
On the edge of housing 24, the 4 arcs of recesses locating surface 5 of lolling of locating piece 8 can be against the appearance of bell-mouthed outer blast pipe 23
On face, the outer blast pipe for the inside exhaust pipe for being cased with spiral shape weld-ring 21 is inserted positioned at the center of two coil portions 11, magnetic conduction iron
Core 12 is symmetrically distributed in the both sides of bell-mouthed outer blast pipe, the mouth of pipe height position of bell-mouthed outer blast pipe on vertical direction
It is on the upper side in conducting magnet core 12.
So, during welding, spiral shape weld-ring 21 will fall off in horn mouth, as shown in figure 5, high frequency electric source is through portable hand
Hold transformer and flow to toroidal inductor 9, high frequency electric during two toroidal inductors 9 through producing high frequency magnetic field, in magnetic conduction iron
Under the booster action of core 12, the tubaeform nose end of high-frequency heating center (as shown in Figure 6) is in by transient heating high temperature,
Spiral shape weld-ring 21 in horn mouth instant melting, the spiral shape weld-ring 21 of thawing under the bell-mouthed radiation effects of high temperature
The infall flowed between inside exhaust pipe 22 and tubaeform nose end carries out the filling of solder, to realize outer blast pipe and interior exhaust
The welded seal of pipe.
Preferred embodiment of the present utility model, still, the utility model and unlimited is described in detail above in association with accompanying drawing
In this.In range of the technology design of the present utility model, a variety of simple variants can be carried out to the technical solution of the utility model,
It is combined in any suitable manner including each particular technique feature.In order to avoid unnecessary repetition, the utility model
Various combinations of possible ways are no longer separately illustrated.But these simple variants and combination should equally be considered as the utility model institute
Disclosure, belong to the scope of protection of the utility model.
Claims (13)
1. a kind of locating piece, it is characterised in that the locating piece is used to be arranged on ratio-frequency welding inductor, and the locating piece is formed
Have for supporting and protecting the concave arc surface of the outer lower face of toroidal inductor (1).
2. locating piece according to claim 1, it is characterised in that the locating piece includes plane plate (2), the plane
Arched arm (3) is integrally extended with the side outward flange of plate body (2), wherein, the concave arc surface (1) of the arched arm (3) and institute
State between plane plate (2) and difference in height be present, and be tangential on the plane of the minimum point of the concave arc surface (1) and the plane
The plate face of plate body is parallel.
3. locating piece according to claim 2, it is characterised in that formed with two interval cloth on the plane plate (2)
The arched arm (3) put, wherein, formed with loll (4) between two arched arms (3), the front end face for lolling (4)
Formed with the arcs of recesses locating surface (5) for contacting the outer surface of adapter to be welded to be positioned to the adapter to be welded.
4. locating piece according to claim 3, it is characterised in that the lingual surface and the plane plate (2) for lolling (4)
Plate face flush.
5. a kind of ratio-frequency welding inductor, it is characterised in that the ratio-frequency welding inductor includes the body with line of induction circle body (6)
(7) and the locating piece according to any one in claim 1-4 (8), wherein,
The line of induction circle body (6) includes toroidal inductor (9), and the locating piece (8) is connected on the body (7), and
And the outer lower face of the toroidal inductor (9) is located in the concave arc surface (1).
6. ratio-frequency welding inductor according to claim 5, it is characterised in that the toroidal inductor (9) includes two
The coil portion (11) that parallel interval is arranged and connected by connecting portion (10), and each coil portion (11) is positioned at respective
In the concave arc surface (1).
7. ratio-frequency welding inductor according to claim 6, it is characterised in that the centre that each coil portion (11) is formed
Conducting magnet core (12) is provided with space.
8. ratio-frequency welding inductor according to claim 5, it is characterised in that the line of induction circle body (6) passes through a copper
Pipe is bent to be formed.
9. ratio-frequency welding inductor according to claim 5, it is characterised in that the outer surface of the toroidal inductor (9)
On covered with insulating barrier.
10. ratio-frequency welding inductor according to claim 5, it is characterised in that the line of induction circle body (6) includes straight length
(13), wherein, the locating piece (8) is fixedly connected with the straight length (13).
11. the ratio-frequency welding inductor according to any one in claim 5-10, it is characterised in that body (7) bag
Two contact tubes (15) for including installing plate (14) and being disposed in the plate face of the installing plate (14), wherein,
The line of induction circle body (6) and the contact tube (15) connection.
12. ratio-frequency welding inductor according to claim 11, it is characterised in that set in the plate face of the installing plate (14)
There is the insulating barrier (16) between two contact tubes (15).
13. ratio-frequency welding inductor according to claim 11, it is characterised in that in the line of induction circle body (6) formed with
Cooling duct, wherein, the cooling duct is connected with the pipe internal channel of the contact tube (15), and the installing plate (14)
On formed with the water inlet (17) communicated with a contact tube and the delivery port (18) communicated with another contact tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720350408.0U CN206779678U (en) | 2017-04-05 | 2017-04-05 | Locating piece and ratio-frequency welding inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720350408.0U CN206779678U (en) | 2017-04-05 | 2017-04-05 | Locating piece and ratio-frequency welding inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206779678U true CN206779678U (en) | 2017-12-22 |
Family
ID=60706939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720350408.0U Expired - Fee Related CN206779678U (en) | 2017-04-05 | 2017-04-05 | Locating piece and ratio-frequency welding inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206779678U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108838503A (en) * | 2018-08-13 | 2018-11-20 | 无锡天隆汽车部件制造有限公司 | Oil sump oil rule conduit automatic welding machine |
| CN113059259A (en) * | 2021-04-06 | 2021-07-02 | 合肥邦立电子股份有限公司 | High-frequency digital induction welding device and method for liquid level sensor |
-
2017
- 2017-04-05 CN CN201720350408.0U patent/CN206779678U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108838503A (en) * | 2018-08-13 | 2018-11-20 | 无锡天隆汽车部件制造有限公司 | Oil sump oil rule conduit automatic welding machine |
| CN113059259A (en) * | 2021-04-06 | 2021-07-02 | 合肥邦立电子股份有限公司 | High-frequency digital induction welding device and method for liquid level sensor |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171222 |
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| CF01 | Termination of patent right due to non-payment of annual fee |