CN101769167A - Double-rotor rolling-piston-type expansion engine for cold water machine set - Google Patents
Double-rotor rolling-piston-type expansion engine for cold water machine set Download PDFInfo
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- CN101769167A CN101769167A CN201010031365A CN201010031365A CN101769167A CN 101769167 A CN101769167 A CN 101769167A CN 201010031365 A CN201010031365 A CN 201010031365A CN 201010031365 A CN201010031365 A CN 201010031365A CN 101769167 A CN101769167 A CN 101769167A
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Abstract
The invention discloses a double-rotor rolling-piston-type expansion engine for a cold water machine set. The expansion engine has a horizontal-type structure and is formed by connecting two cylinders in series; front and rear end covers of cylinder bodies, the cylinder bodies, a two-cylinder gas connecting channel, an oil return chamber and other parts which are sequentially sealed and connected by bolts; cranks are embedded into bearings of the front and the rear end covers of the second cylinder body; a lubricating oil pump is arranged at the outer side of the front end cover of the first cylinder body, and an outlet of the oil pump is connected with an oil supply channel; return oil returns a lubricating oil chamber from the oil return chamber through an oil return channel; the outer end of a crankshaft is nested with a balance weight; and the crankshaft and a flange connected with a motor have the same axle center. The double-rotor rolling-piston-type expansion engine omits a suction control device of a single-stage rolling-piston-type expansion engine, directly utilizes a first cylinder to control suction capacity, adjusts the inner diameter size dimension of two cylinders so as to meet different expansion ratio, and realizes the design with high expansion ratio. By adopting the expansion engine to replace a throttle valve, the expansion work can be easily recovered, the refrigerating output is obviously increased by the cold water machine set, and the performance is stable and reliable.
Description
Technical field
The invention belongs to refrigerating machine, be specifically related to the rolling-piston-type decompressor in a kind of water chilling unit system.
Background technique
Along with the quick growth of GNP gross national product and improving constantly of people's living standard, people also improve gradually to the pursuit of quality of the life, and this makes China's handpiece Water Chilling Units obtain fast development.China has formulated " handpiece Water Chilling Units efficiency limit value and energy efficiency grade " in 2004, stipulate 5 other energy efficiency grades of level, and wherein the 5th grade is minimum entry level, and the 2nd grade and the 1st grade is energy-conservation level.Present most handpiece Water Chilling Units is equivalent to 3,4 grades of national efficiency standard, and still some reaches 5 grades reluctantly.In recent years, people have done a lot of things mostly in the design of circulation theory, high-efficient compressor (screw type, centrifugal), throttle mechanism and heat exchanger, for example replace in theory perfect etc. of throttle valve with decompressor.For contrary Carnot's cycle, by the decompressor step-down and to reclaim expansion work be to realize easily in theory, but in actual steam compression refrigeration circulation, the inflation process expansion ratio is bigger, and phase change expansion process itself is very complicated, the exploitation of efficient decompressor is difficulty relatively, people have to adopt throttle valve simple in structure to replace decompressor, so not only lost expansion work, and become low warm because of throttle valve irreversible, having offset refrigerating capacity, therefore, is double with the loss of the refrigeration cycle of throttle valve.Developing handpiece Water Chilling Units decompressor efficiently, is one of key technology that increases substantially chiller efficiency, recovered energy in order to replace throttle valve.By analyzing, under the standard cooling condition, when efficiency of expander is 0.7, utilize decompressor to replace throttle valve can improve the Energy Efficiency Ratio of unit about 10%, the energy of Hui Shouing accounts for compressor catabiotic about 8% simultaneously.
Summary of the invention
According to the characteristics of water chilling unit system, the purpose of this invention is to provide a kind of in order to reclaim the double-rotor rolling-piston-type decompressor of restriction loss, raising unit performance, so that the water chilling unit system performance significantly improves.
Below in conjunction with accompanying drawing structural principle of the present invention is described.Double-rotor rolling-piston-type expansion engine for cold water machine set is a horizontal type structure, is formed by two cylinder body serial connections.With following parts: oil chamber, lubricating pump, front and rear cover, cylinder body, rolling piston, two cylinder gas connecting passages, bent axle, counterweight, oil revolute chamber and connect (as shown in Figure 1) by bolt seal in order for drainback passage etc., bent axle is embedded in the bearing of second forward and backward end cap of cylinder body mutually.Lubricating pump places first cylinder body front cover outside, and the oil pump outlet connects oil supply gallery.Because crankshaft center is provided with oil leab, each lubricating component (mainly being bearing and rolling piston etc.) radially has through hole and communicates with oil leab, so that each bearing and rolling piston are lubricated, oil return from oil revolute chamber in drainback passage returns the oil chamber.Because two cylinders vary in weight and have off-centre, make bent axle be subjected to force unbalance at radial direction, be easy to generate distortion so that influence the bent axle life-span, for equilibrant poor, so in the nested counterweight in bent axle outer end, bent axle and motor connecting flange concentric.
The double-rotor rolling Piston Expander has following feature angle: the first cylinder body intakeport rear edge angle [alpha]
1, the first cylinder relief opening front edge angle beta
1, the second cylinder body intakeport rear edge angle [alpha]
2, relief opening front edge angle beta
2And the shared angle δ of two cylinder portings.Two cylinder slide plate center lines become α
2+ β
1The angle assembling (as shown in Figure 2) of-δ.The length of first and second cylinder connecting tube has been shortened in such assembling, to reduce clearance volume and flow resistance.When first cylinder sucks working medium when beginning to be communicated with relief opening, the second cylinder rolling piston has turned over intakeport front edge angle β
1, make the second cylinder breathing process normally carry out.The aspirated volume of Piston Expander and the end volume that expands are made of jointly the partial volume of two cylinder bodies and the volume of connecting tube, utilize first cylinder to control gettering quantity.When air-breathing end, when expanding beginning, the refrigerant volume of suction is made of with connecting tube volume, the second cylinder fraction volume jointly the most of volume of first cylinder; When the end of expanding, beginning exhaust, the shared volume of refrigeration agent is made of jointly the first cylinder fraction volume and connecting tube volume, the most of volume of second cylinder.Both ratio is expansion ratio, and the size of therefore adjusting two cylinders can satisfy different expansion ratios.Can not need other air inlet control with first cylinder control air inflow, frictional loss, restriction loss and because pressure pulsation that the suction valve switch causes and the noise etc. of having avoided air inlet control to bring.
The working procedure of double-rotor rolling Piston Expander is: the points of tangency position of decompressor rolling piston and cylinder inner wall is from being starting point to turn clockwise then straight up, and θ is the angle that turns over.As θ=α
1During-δ, promptly turn over the first cylinder suction port front edge angle, refrigeration agent enters first cylinder of decompressor; As θ=360 °-β
1The time, promptly turning over the first cylinder relief opening front edge angle, this moment, the first cylinder relief opening was communicated with the second cylinder suction port by connecting tube, and decompressor second cylinder begins air inlet; As θ=360 °+α
1The time, promptly turning over the second first cylinder suction port rear edge angle of enclosing, the most of volume of first cylinder and connecting tube volume, the second cylinder fraction volume that are full of refrigeration agent form enclosed space, and whole breathing process finishes, and begins to expand; As θ=720 °-β
2The time, promptly turning over the second second cylinder relief opening front edge angle of enclosing, be communicated with outlet pipe this moment, expands to finish, and exhaust begins.As θ=1080 °-β
2The time, promptly turning over the 3rd second cylinder relief opening front edge angle of enclosing, exhaust finishes, and next circulating exhaust begins.
Description of drawings
Fig. 1 is a principle of the invention structure diagram.
Fig. 2 is the first cylinder body expansion cell structural drawing.
Fig. 3 is the second cylinder body expansion cell structural drawing.
Embodiment
Below by specific embodiment know-why of the present invention and structure are further described.Double-rotor rolling-piston-type expansion engine for cold water machine set comprises: oil chamber 1, lubricating pump 2, the first cylinder front cover 3, first cylinder body 4, the first cylinder rear end cover 5, the second cylinder front cover 6, two cylinder gas connecting passages 7, second cylinder body 8, bent axle 9, the second cylinder rear end cover 10, counterweight 11, oil revolute chamber 12, lubricant oil oil supply gallery 13, bearing 14, drainback passage 15, motor connecting flange 16, first slide plate 17, second slide plate, 18, the first cylinder exhaust passages 19, the first cylinder gas-entered passageway 20, the first cylinder rolling piston 21, the second cylinder exhaust passage 22, the second cylinder gas-entered passageway 23 and the second cylinder rolling piston 24 etc.Structurally, decompressor is a horizontal type structure, formed by two cylinder bodies serial connection, the first cylinder body front cover 3, first cylinder body 4, first rear end of the cylinder block lid, 5, the second cylinder body front cover 6, two cylinder gas connecting passages 7, second cylinder body 8, second rear end of the cylinder block lid 10 are connected by bolt seal in order with oil revolute chamber 12.Bent axle 9 is embedded in the bearing 14 of the second cylinder body front cover 6 and second rear end of the cylinder block lid 10 mutually.Lubricating pump 2 places the first cylinder body front cover, 3 outsides, and oil pump outlet connects and oil supply gallery 13, oil return from oil revolute chamber 12 in drainback passage 15 returns oil chamber 1.The nested counterweight 11 in bent axle 9 outer ends, bent axle and motor connecting flange 16 concentrics.The aspirated volume and the end volume that expands are formed jointly by the partial volume of first cylinder body 4, two cylinder gas connecting passages 7 and second cylinder body 8.The angle of first slide plate 17 in first cylinder body 4 and second slide plate, 18 center lines in second cylinder body 8 is α
2+ β
1-δ, wherein: α
2It is the second cylinder body intakeport rear edge angle; β
1It is the first cylinder relief opening front edge angle; δ is the shared angles of two cylinder body portings.Each cylinder body is by compositions such as rolling piston, intake and exhaust channel and slide plates, rolling piston is contained on the bent axle, when work, piston moves at cylinder inner wall, and form a crescent-shaped space between the cylinder, the slide plate end closely contacts with piston, with the crescent-shaped space separated into two parts, the crescent-shaped space two ends by the cylinder end cap seal, so constituted the active chamber (as Fig. 2 and 3) of sealing.When refrigeration agent expands in active chamber, can promote rolling piston rotation and then expansion work is exported by main shaft.
The refrigeration that operates under the standard condition with handpiece Water Chilling Units band double-rotor rolling-piston-type expander system embodies Application Example: (chilled water advances for 12 ℃, and 7 ℃ go out when handpiece Water Chilling Units operates in standard; Cooling water advances for 30 ℃, and 35 ℃ go out) during cooling condition, through experimental verification, the evaporating temperature of this moment is 0 ℃, and condensing temperature is 40 ℃, and expansion ratio is 13.The present invention has replaced the effect that throttle valve is finished the throttling step-down in system, realize the normal operation of handpiece Water Chilling Units, and has increased the refrigerating capacity of unit, and has produced the electric energy that accounts for consumed work 5%.The decompressor structural parameter of this moment are as shown in table 1.
Table 1 double-rotor rolling-piston-type expansion engine for cold water machine set specific embodiment size
| First cylinder bore/mm | ??95 | Second cylinder bore/mm | ??184 |
| First cylinder throw of eccentric/mm | ??5 | Second cylinder throw of eccentric/mm | ??17 |
| First cylinder cylinder height/mm | ??35 | Second cylinder cylinder height/mm | ??80 |
| ??α 1/ degree | ??25 | ??α 2/ degree | ??25 |
| ??β 1/ degree | ??25 | ??β 2/ degree | ??25 |
| δ/degree | ??10 | Expansion ratio | ??13 |
Advantage of the present invention and beneficial effect are: save single-stage rolling-piston-type decompressor suction control device, directly utilize the first cylinder to control inspiratory capacity; The size of adjusting two cylinders can satisfy different expansion ratios, realizes the design of large expansion ratio. Adopt decompressor to replace choke valve, be conducive to the recovery of expansion work, handpiece Water Chilling Units has obviously increased refrigerating capacity and stable and reliable for performance.
Claims (3)
1. double-rotor rolling-piston-type expansion engine for cold water machine set, has oil chamber (1), lubricating pump (2), the first cylinder front cover (3), first cylinder body (4), the first cylinder rear end cover (5), the second cylinder front cover (6), two cylinder gas connecting passages (7), second cylinder body (8), bent axle (9), the second cylinder rear end cover (10), counterweight (11), oil revolute chamber (12), lubricant oil oil supply gallery (13), bearing (14), drainback passage (15), motor connecting flange (16), first slide plate (17), second slide plate (18), it is characterized in that decompressor is a horizontal type structure, form by two cylinder body serial connections, the first cylinder body front cover (3), first cylinder body (4), first rear end of the cylinder block lid (5), the second cylinder body front cover (6), two cylinder gas connecting passages (7), second cylinder body (8), second rear end of the cylinder block lid (10) is connected by bolt seal by described order with generator junction chamber (12), bent axle (9) is embedded in the bearing (14) of the second cylinder body front cover (6) and second rear end of the cylinder block lid (10) mutually, lubricating pump (2) places the first cylinder body front cover (3) outside, the lubricating pump outlet connects and lubricant oil oil supply gallery (13), oil return from oil revolute chamber (12) in drainback passage (15) returns oil chamber (1), the nested counterweight in bent axle (9) outer end (11), bent axle and motor connecting flange (16) concentric.
2. according to the described double-rotor rolling-piston-type expansion engine for cold water machine set of claim 1, the cylinder bore diameter that it is characterized in that described first cylinder body (4) and second cylinder body (8) can be adjusted, and the decompressor aspirated volume and the end volume that expands are made of jointly the partial volume of described first cylinder body (4) and second cylinder body (8) and the volume of two cylinder gas connecting passages (7).
3. according to claim 1 or 2 described double-rotor rolling-piston-type expansion engine for cold water machine set, it is characterized in that first slide plate (17) in described first cylinder body (4) and the angle of second slide plate (18) center line in second cylinder body (8) are α
2+ β
1-δ, wherein: α
2It is the second cylinder body intakeport rear edge angle; β
1It is the first cylinder relief opening front edge angle; δ is the shared angles of two cylinder body portings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010031365A CN101769167A (en) | 2010-01-18 | 2010-01-18 | Double-rotor rolling-piston-type expansion engine for cold water machine set |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010031365A CN101769167A (en) | 2010-01-18 | 2010-01-18 | Double-rotor rolling-piston-type expansion engine for cold water machine set |
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|---|---|
| CN101769167A true CN101769167A (en) | 2010-07-07 |
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|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104864638A (en) * | 2014-02-21 | 2015-08-26 | 珠海格力电器股份有限公司 | Water chilling unit |
| CN110714801A (en) * | 2018-07-12 | 2020-01-21 | 艾默生环境优化技术(苏州)有限公司 | Expander and fluid circulation system including the same |
-
2010
- 2010-01-18 CN CN201010031365A patent/CN101769167A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104864638A (en) * | 2014-02-21 | 2015-08-26 | 珠海格力电器股份有限公司 | Water chilling unit |
| CN104864638B (en) * | 2014-02-21 | 2017-03-08 | 珠海格力电器股份有限公司 | Water chilling unit |
| CN110714801A (en) * | 2018-07-12 | 2020-01-21 | 艾默生环境优化技术(苏州)有限公司 | Expander and fluid circulation system including the same |
| CN110714801B (en) * | 2018-07-12 | 2024-05-31 | 谷轮环境科技（苏州）有限公司 | Expander and fluid circulation system comprising an expander |
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Application publication date: 20100707 |