CN203192559U - Low-melting-point metal liquid rheostat - Google Patents
Low-melting-point metal liquid rheostat Download PDFInfo
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- CN203192559U CN203192559U CN 201320226179 CN201320226179U CN203192559U CN 203192559 U CN203192559 U CN 203192559U CN 201320226179 CN201320226179 CN 201320226179 CN 201320226179 U CN201320226179 U CN 201320226179U CN 203192559 U CN203192559 U CN 203192559U
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Abstract
The utility model relates to a low-melting-point metal liquid rheostat, which consists of a shell, a fixed electrode plate, a moving electrode plate, low-melting-point metal and a lead screw. The fixed electrode plate is fixedly arranged on the shell. The low-melting-point metal is filled in the shell. The moving electrode plate and the fixed electrode plate 2 are arranged in a pair. The movable electrode plate is connected with the lead screw 5. Under the drive of the lead screw, the moving electrode plate moves up and down in the shell to change distance between the fixed electrode plate and the moving electrode plate, so as to change the resistance of the rheostat, so that the goals of regulating starting current and softly starting a motor are achieved. The low-melting-point metal liquid rheostat fully utilizes the characteristics of high stability, non-toxicity and good heat and electric conductivity of the low-melting-point metal, a rheostat system is enabled to be safer and more stable, and the size and the weight of the system are greatly reduced. The low-melting-point metal liquid rheostat can be widely applied in the field of the soft start of various high-voltage and low-voltage high-power motors.
Description
Technical field
The present invention relates to a kind of rheostat, the particularly liquid rheostat made of a kind of conductivity of utilizing low-melting-point metal can be applicable to the soft start of alternating current motor.
Background technology
Alternating current motor and extensively as the power of Electric Traction manufacturing machine, has a large amount of application in various industries because it has simple in structurely, reliable, easy to maintenance, cheap.Motor across-the-line starting under constant voltage, its starting current is about 6-12 times of rated current, its rotating speed will be in very short time rises to rated speed from zero, can produce in starting process and impact, and is easy to make the transmission mechanism etc. of Electric Traction object to cause heavy wear even damage.Particularly high-tension motor will cause that line voltage reduces, and has influence on the normal operation of miscellaneous equipment in the electrical network under the impact of starting instantaneous large-current.
Liquid rheostat is the method for present most widely used alternating current motor soft start.Liquid rheostat is conducting medium with chemical salt solution (as the aqueous solution of sodium carbonate or sodium chloride), liquid resistance is sealed in the rotor loop of motor, change polar plate spacing by servomotor, thereby change the size of liquid resistance, reach the purpose that stepless continuous is adjusted motor starting torque and starting current.The characteristics of power transformation resistance simple in structure, stepless that liquid rheostat has, but what liquid rheostat used is the aqueous solution of sodium carbonate or sodium chloride, because salting liquid has stronger corrosivity, faults such as the corrosion of travel switch shell and conductive junction point loose contact often appear on the one hand; On the other hand, salting liquid is easily explosive evaporation at high temperature, and the amount that therefore needs to increase salting liquid increases thermal capacity, causes equipment volume huge; And salting liquid is volatile at normal temperatures, needs constantly to replenish, and increases Operating Complexity.
For this reason, the present invention proposes a kind of low-melting-point metal liquid rheostat, is working media with the low-melting-point metal, utilizes its conductivity to make the stepless variation of resistance, realizes the soft start of alternating current motor.Its typical advantages is as follows: (1) good conductivity.Low-melting-point metal has the conductivity far above chemical salt solution, so the low-melting-point metal consumption is few, and system bulk is little in light weight; (2) high temperature resistant.The low-melting-point metal boiling point is up to 2000oC, stable in properties, and not volatile, system is more safe and reliable; (3) thermal conductivity height.Low-melting-point metal has the thermal conductivity far above water, thereby the resistance heating amount in time can be distributed; (4) nontoxic, physico-chemical property is stable.Low-melting-point metal is not volatile, does not need regularly liquid make-up, and low-melting-point metal is difficult for the corrosion electrode, moves more stable.
Summary of the invention
The object of the present invention is to provide a kind of low-melting-point metal liquid rheostat, this rheostat is working media with the low-melting-point metal, utilizes its conductivity to make the stepless variation of resistance, realizes the soft start of alternating current motor.
Technical scheme of the present invention is as follows:
Low-melting-point metal liquid rheostat provided by the invention, as shown in Figure 1, it is composed as follows:
One housing 1;
One static pole plate 2, described static pole plate 2 are fixed in the described housing 1;
One moving electrode plate 3, described moving electrode plate 3 and described static pole plate 2 positioned opposite;
One low-melting-point metal 4, described low-melting-point metal 4 are filled in the described housing 1;
One screw mandrel 5, described screw mandrel 5 links to each other with described moving electrode plate 3.
Described housing 1 material can be metal, plastics or pottery; Described metal is stainless steel or copper; Described plastics are polyethylene, polypropylene, polyvinyl chloride or Merlon; Described pottery is aluminium oxide ceramics.
Described static pole plate 2 and described moving electrode plate 3 materials are metal, conductivity ceramics or graphite.
Described low-melting-point metal 3 is gallium, gallium base bianry alloy, gallium based multicomponent alloy, the indium-base alloy of fusing point below 50oC, or bismuth-base alloy.
Described gallium base bianry alloy is gallium indium alloy, gallium lead alloy or gallium mercury alloy.
Described gallium based multicomponent alloy is gallium-indium-tin alloy or gallium indium tin kirsite.
Described screw mandrel 5 links to each other with described moving electrode plate 3, moves up and down in housing to drive described moving electrode plate 3, and then changes the distance of 3 of described static pole plate 2 and described moving electrode plates.
In actual motion, low-melting-point metal liquid rheostat provided by the invention, during motor starting the resistance value of low-melting-point metal liquid rheostat with maximum is serially connected in the rotor loop, guarantee that motor begins starting with less starting current and bigger moment, movement along with electrode, two interelectrode distances diminish continuously, can obtain the continually varying resistance value between electrode.When two interelectrode distances were zero, the external resistance value of low-melting-point metal liquid rheostat just equalled zero, and start-up course finishes, and motor operates on the inherent characteristic curve.
Low-melting-point metal liquid rheostat of the present invention, its advantage is:
(1) good conductivity.Low-melting-point metal has the conductivity far above chemical salt solution, so the low-melting-point metal consumption is few, and system bulk is little in light weight.
(2) high temperature resistant.The low-melting-point metal boiling point is up to 2000oC, stable in properties, and not volatile, system is more safe and reliable.
(3) thermal conductivity height.Low-melting-point metal has the thermal conductivity far above water, thereby the resistance heating amount in time can be distributed.
(4) nontoxic, physico-chemical property is stable.Low-melting-point metal is not volatile, thereby does not need regularly liquid make-up, and low-melting-point metal is difficult for the corrosion electrode, moves more stable.
The present invention can be widely used in the soft start application of various high voltage and high power electromotors.
Description of drawings
The structural representation of low-melting-point metal liquid rheostat when Fig. 1 begins to start for motor among the embodiment 1;
Fig. 2 is the structural representation of low-melting-point metal liquid rheostat when motor start-up finishes among the embodiment 1.
Embodiment
Further describe the present invention below in conjunction with drawings and the specific embodiments.
As depicted in figs. 1 and 2, the low-melting-point metal liquid rheostat of present embodiment is by housing 1, static pole plate 2, moving electrode plate 3, low-melting-point metal 4, and screw mandrel 5 is formed.
Described housing 1 material is stainless steel;
Described static pole plate 2 is fixed in the described housing 1, and material is copper;
Described moving electrode plate 3 is parallel relative with described static pole plate 2, and material is copper;
Described low-melting-point metal 4 is filled in the described housing 1, and low-melting-point metal 4 is gallium indium tin bismuth Zinc-tin alloy;
Described screw mandrel 5 links to each other with described moving electrode plate 3, moves up and down in housing to drive described moving electrode plate 3, and then changes the distance of 3 of described static pole plate 2 and described moving electrode plates.
Adopt the initial distance of different electrode sections and different electrode, can obtain different rheostat maximum resistance.In the present embodiment, described static pole plate 2 is long-pending with the electrode sections of described moving electrode plate 3 to be 1cm
2, distance is 1.2m.The conductivity of low-melting-point metal 4 is 1.2*10
4S/m.According to the resistance calculations formula as can be known, the low-melting-point metal liquid rheostat in the present embodiment, its maximum resistance is:
Wherein,
Be the resistivity of low-melting-point metal, L is the pole plate distance, and S is the pole plate sectional area.
In actual motion, the low-melting-point metal liquid rheostat that present embodiment provides, during motor starting the resistance value of low-melting-point metal liquid rheostat with maximum is serially connected in the rotor loop, guarantee that motor begins starting with less starting current and bigger moment, movement along with electrode, two interelectrode distances diminish continuously, can obtain the continually varying resistance value between electrode.When two interelectrode distances were zero, the external resistance value of low-melting-point metal liquid rheostat just equalled zero, and start-up course finishes, and motor operates on the inherent characteristic curve.
The low-melting-point metal liquid rheostat that present embodiment provides can be widely used in the soft start application of various high voltage and high power electromotors.
It should be noted that at last above embodiment is only unrestricted in order to technical scheme of the present invention to be described.Although the present invention has been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is made amendment or is equal to replacement, do not break away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (8)
1. low-melting-point metal liquid rheostat is characterized in that it is composed as follows:
One housing (1);
One static pole plate (2), described static pole plate (2) are fixed in the described housing (1);
One moving electrode plate (3), described moving electrode plate (3) and described static pole plate (2) positioned opposite;
One low-melting-point metal (4), described low-melting-point metal (4) are filled in the described housing (1);
One screw mandrel (5), described screw mandrel (5) links to each other with described moving electrode plate (3).
2. by the described low-melting-point metal liquid rheostat of claim 1, it is characterized in that described housing (1) material can be metal, plastics or pottery.
3. by the described low-melting-point metal liquid rheostat of claim 2, it is characterized in that described metal is stainless steel or copper; Described plastics are polyethylene, polypropylene, polyvinyl chloride or Merlon; Described pottery is aluminium oxide ceramics.
4. by the described low-melting-point metal liquid rheostat of claim 1, it is characterized in that described static pole plate (2) and described moving electrode plate (3) material are metal, conductivity ceramics or graphite.
5. by the described low-melting-point metal liquid rheostat of claim 1, it is characterized in that described low-melting-point metal (4) is gallium, gallium base bianry alloy, gallium based multicomponent alloy, the indium-base alloy of fusing point below 50oC, or bismuth-base alloy.
6. by the described low-melting-point metal liquid rheostat of claim 5, it is characterized in that described gallium base bianry alloy is gallium indium alloy, gallium lead alloy or gallium mercury alloy.
7. by the described low-melting-point metal liquid rheostat of claim 5, it is characterized in that described gallium based multicomponent alloy is gallium-indium-tin alloy or gallium indium tin zinc bismuth alloy.
8. by the described low-melting-point metal liquid rheostat of claim 1, it is characterized in that, described screw mandrel (5) links to each other with described moving electrode plate (3), moves up and down in housing to drive described moving electrode plate (3), and then changes distance between described static pole plate (2) and described moving electrode plate (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320226179 CN203192559U (en) | 2013-04-28 | 2013-04-28 | Low-melting-point metal liquid rheostat |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320226179 CN203192559U (en) | 2013-04-28 | 2013-04-28 | Low-melting-point metal liquid rheostat |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103198911A (en) * | 2013-04-28 | 2013-07-10 | 北京依米康散热技术有限公司 | Low-melting-point metal liquid rheostat |
| CN107680764A (en) * | 2015-01-05 | 2018-02-09 | 湖南轻创科技有限公司 | Rotary liquid variable resistor and motor starter |
-
2013
- 2013-04-28 CN CN 201320226179 patent/CN203192559U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103198911A (en) * | 2013-04-28 | 2013-07-10 | 北京依米康散热技术有限公司 | Low-melting-point metal liquid rheostat |
| CN107680764A (en) * | 2015-01-05 | 2018-02-09 | 湖南轻创科技有限公司 | Rotary liquid variable resistor and motor starter |
| CN107705947A (en) * | 2015-01-05 | 2018-02-16 | 湖南轻创科技有限公司 | Rotating liquid variable resistance, motor starter |
| CN107705948A (en) * | 2015-01-05 | 2018-02-16 | 湖南轻创科技有限公司 | Rotating liquid variable resistance, motor starter |
| CN107705947B (en) * | 2015-01-05 | 2019-01-01 | 嵊州市鑫聚源厨具有限公司 | Rotating liquid variable resistance, motor starter |
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Effective date of registration: 20190507 Address after: 100142 Beijing Haidian District Fuwai Liangjiadian No. 1 Internet Cultural and Creative Industry Park Office Building, 1st Floor A District 013 Patentee after: Beijing Zhongjin Science and Technology Co.,Ltd. Address before: Room 368, Yuquan Building, 3 Shijingshan Road, Shijingshan District, Beijing 100040 Patentee before: Beijing Coollion Heat Dissipation Technology Co.,Ltd. |
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Granted publication date: 20130911 |