CN208348064U - Rotary compressor and refrigerated air-conditioning system - Google Patents

Abstract

The utility model discloses a kind of rotary compressor and refrigerated air-conditioning systems.Compression mechanism is located in shell in rotary compressor, and compression mechanism includes: cylinder；Bearing, for bearing fit in the end face of cylinder, bearing is equipped with plunger cavity, and plunger cavity has opening on the end face towards cylinder, the first by-pass prot of connection plunger cavity is additionally provided in bearing；Piston, piston are movably located in cylinder；Plunger, plunger are movably arranged in plunger cavity between the first stop and the second stop；One end of the separate cylinder of plunger cavity can enter or flow out lubricating oil, when lubricating oil enters plunger cavity, plunger is mobile to block the first by-pass prot towards the first stop, it works under full capacity operating status, when outflow of lubrication oil plunger cavity, plunger is mobile to open the first by-pass prot towards the second stop, works under portion capacity operating status.Rotary compressor according to the present utility model, transfiguration flexible movements, switching be accurate and reliable, pressure oscillation is small in handoff procedure.

Description

Rotary compressor and refrigerated air-conditioning system

Technical field

The utility model relates to field of refrigeration equipments, more particularly, to a kind of rotary compressor and refrigerated air-conditioning system.

Background technique

Currently, in the related art, the compressor that constant speed air-conditioning system uses is due to being constant speed drive, when Indoor Thermal is negative Lotus be less than compressor refrigerating capacity when, compressor must continuous start and stop, the constant of room temperature could be maintained in this way.Pressure The frequent start-stop of contracting machine reduces refrigerating efficiency of the refrigeration system in portion capacity, annual energy efficiency decline.

Transfiguration refrigeration compressor be a kind of tool there are two and more than two cylinder chambers compressor, typically there are two tool The rotary compressor of cylinder.When cooling load is larger, compressor operates (two cylinders work at the same time) with full capacity；Work as system When refrigeration duty is smaller, compressor operates (only one of which cylinder operation, another does not work) with portion capacity.Using transfiguration The air-conditioning system of compressor, can to avoid constant speed air-conditioning system in portion capacity existing high frequent start and stop and part hold Amount efficiency reduces problem, and SEER (refrigeration season energy efficiency ratio) is much higher than constant speed air-conditioning system, although again below frequency conversion Air-conditioning system, but its cost is far below frequency-conversion air-conditioning system.It may be said that positive displacement compressor is that one kind has taken into account constant speed compressor Low cost and frequency-changeable compressor a kind of efficient compromise proposal, be in recent years Compressor Technology development an important side To.

Existing positive displacement compressor, displacement-variable device are mostly to realize volume change by means of the variation of gas pressure 's.For example, for the common second level positive displacement compressor using slide plate as discharge mechanism, when the cavity and sky of slide plate behind When the high-pressure side of adjusting system is connected, whole volumes of compresser cylinder participate in gas compression, and positive displacement compressor works in entirely at this time Capacity status；When the cavity of slide plate behind is connected with the low-pressure side of air-conditioning system, only portion capacity participates in the cylinder of compressor Compression, positive displacement compressor works in portion capacity state at this time.Due to gas be it is compressible, with aeroelasticity, this is just So that in a manner of this compressor transfiguration using gas pressure as switching signal and unreliable, especially in compressor start or stop Moment only be easy to cause the malfunction of displacement-variable device at this time due to the fluctuation of high and low pressure, so that compressor is in full capacity It is toggled between portion capacity, power is caused substantially to vibrate, compressor operating state labile can even damage when serious Compressor.It is therefore desirable to improve by the way of capacity switching using gas pressure signal to this.

In addition, existing positive displacement compressor is not only increased into due to being made of two cylinders relative to single cylinder compressor This, and since the friction loss of twin-tub is bigger than single cylinder, the mechanical efficiency under full capacity state compared to single cylinder instead under Drop, counteracts benefit brought by transfiguration technology to a certain extent, thus also has much room for improvement.

Utility model content

The utility model aims to solve at least one of the technical problems existing in the prior art.For this purpose, the utility model One is intended to propose a kind of rotary compressor, and the capacity-variable structure of the rotary compressor and transfiguration control are all very simple It is single.

The utility model, which also aims to, proposes a kind of refrigerated air-conditioning system with above-mentioned rotary compressor.

According to a kind of rotary compressor of the utility model embodiment, comprising: the bottom of shell, the shell has oil Pond, the oil sump is interior to have lubricating oil；Compression mechanism, the compression mechanism are located in the shell, and the compression mechanism includes: The peripheral wall of cylinder, the cylinder is equipped with sliding vane groove；Bearing, the bearing fit is on the end face of the cylinder, the bearing Equipped with plunger cavity, the plunger cavity has opening on the end face towards the cylinder, is additionally provided with described in connection in the bearing First by-pass prot of plunger cavity；Piston, the piston are movably located in the cylinder；Slide plate, the slide plate is movably In the sliding vane groove, the inner end of the slide plate is connected with the piston for cooperation；Plunger, the plunger is in the first stop and second It is movably arranged between stop in the plunger cavity, first stop refers to the plunger apart from the cylinder closest approach, institute Stating the second stop refers to the plunger apart from the cylinder farthest point；Wherein, one end far from the cylinder of the plunger cavity can Into or the outflow lubricating oil drive the plunger towards described first when the lubricating oil enters the plunger cavity Stop is mobile to block first by-pass prot, and the rotary compressor works under full capacity operating status, when the profit When lubricating oil flows out the plunger cavity, drive the plunger mobile to open first by-pass prot, institute towards second stop Rotary compressor is stated to work under portion capacity operating status.

According to the rotary compressor of the utility model embodiment, by using flowing into and out for lubricating oil, to control The movement of plunger enables plunger to block the first by-pass prot, and rotary compressor works under full capacity operating status, can also make Plunger opens the first by-pass prot, and rotary compressor works under portion capacity operating status, using the oil pressure conduct of lubricating oil The driving force of plunger, reduces plunger trembling on the move, and compressor has the flexible movements of capacity switching mechanism, position switching quasi- Really reliable, the small advantage of pressure oscillation in handoff procedure.Compared to the compressor for only controlling transfiguration by twin-tub, the utility model The rotary compressor of embodiment saves a cylinder and partition, reduces mechanical friction loss, more compact structure, cost is more It is low.

In some embodiments, the rotary compressor is vertical compressor, and the bearing is described including being respectively provided at The upper bearing (metal) and lower bearing of the two sides up and down of cylinder, the plunger are provided at the lower bearing of the lower end surface of the cylinder Interior, the plunger cavity is vertically arranged, and the plunger moves in the up-down direction, and the lubricating oil can enter or described in flowing out The bottom of plunger.

Specifically, the plunger cavity is cylindrical cavity, and the lower section diameter of the plunger cavity is greater than the upper of the plunger cavity Section diameter, the upper section of the plunger cavity are connected to the inside of the cylinder, and the side wall of the upper section of the plunger cavity is equipped with described The lower section of first by-pass prot, the plunger cavity is opened wide towards the lower end surface of the lower bearing, and the lower section of the plunger cavity passes through gear Plate sealing.

Optionally, the plunger is cylinder, and the bottom of the plunger is equipped with convex edge, and the upper section of the plunger is movably In the upper section of the plunger cavity, the lower section of the plunger movably cooperates in the lower section of the plunger cavity for cooperation；Work as institute When stating plunger and being located at the top, the upper surface of the plunger plunger concordant or described with the upper surface of the lower bearing it is upper End face is located at below the upper surface of the lower bearing；When the plunger is located at bottom, the upper surface of the plunger is located at institute It states in the upper section of plunger cavity.

In some embodiments, the cylinder have suction hole and the second by-pass prot, one end of second by-pass prot with The suction hole connection, the other end of second by-pass prot are connected to first by-pass prot.

Specifically, rotary compressor further includes spring of the housing on the plunger, and the both ends of the spring are stopped respectively The upper surface of the convex edge of the upper surface and plunger of lower section cavity to the plunger cavity.

Further, rotary compressor further include: triple valve, there are three interface and two kinds of connected states for the triple valve tool State, three interfaces are respectively first interface, second interface and third interface, and the first interface is connected into low pressure refrigerant gas Body, the second interface are connected with one end far from the cylinder of the plunger cavity, the third interface and the oil sump phase Even, the second interface is connected to one in the first interface and the third interface.

Still optionally further, rotary compressor further include: the first capillary, one end of first capillary with it is described The suction hole of cylinder is connected, and the other end of first capillary is connected with the first interface；Second capillary, described second One end of capillary is connected with the plunger cavity, and the other end of second capillary is connected with the second interface；Third hair One end of tubule, the third capillary is connected with the oil sump, the other end of the third capillary and the third interface It is connected.

Optionally, the lower bearing is immersed in the lubricating oil of the oil sump, and the baffle is equipped with for entering or flowing The aperture of the lubricating oil out.

According to a kind of refrigerated air-conditioning system of the utility model embodiment, including according to the utility model above-described embodiment Rotary compressor.Due to being provided with the rotary compressor of above-described embodiment, refrigerated air-conditioning system transfiguration switching action Flexibly, accurately and reliably, in handoff procedure pressure oscillation it is small.

The additional aspect and advantage of the utility model will be set forth in part in the description, partially will be from following description In become obvious, or recognized by the practice of the utility model.

Detailed description of the invention

The above-mentioned and/or additional aspect and advantage of the utility model from the description of the embodiment in conjunction with the following figures will Become obvious and be readily appreciated that, in which:

Fig. 1 is the overall structure diagram of the rotary compressor of the utility model embodiment.

Fig. 2 is the structural schematic diagram of the cylinder chamber of the utility model embodiment.

Appended drawing reference:

Rotary compressor 100,

Shell 1, exhaust outlet 2, air entry 3, liquid storage device 4, air intake duct 5, motor 6, crankshaft 7, cylinder 8, the second by-pass prot 8b, compression chamber 8c, gas vent 8d, suction hole 8s, slide plate 8h, upper bearing (metal) 9, lower bearing 10, opening 10a, the first by-pass prot 10b, Plunger cavity 10c, piston 11, plunger 12, spring 13, baffle 14, triple valve 15, first interface 15a, second interface 15b, third connect Mouth 15c, control element 15d, the first capillary 16, the second capillary 17, third capillary 18, oil sump 19, pasta 19a.

Specific embodiment

The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng The embodiment for examining attached drawing description is exemplary, and is only used for explaining the utility model, and should not be understood as to the utility model Limitation.

In the description of the present invention, it should be understood that term " center ", "upper", "lower", "vertical", "horizontal", The orientation or positional relationship of the instructions such as "top", "bottom", "inner", "outside", " axial direction " is that orientation based on the figure or position are closed System, is merely for convenience of describing the present invention and simplifying the description, rather than the device or element of indication or suggestion meaning are necessary It with specific orientation, is constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.In this reality With in novel description, " fisrt feature ", " second feature " may include one or more of the features.

Below with reference to Fig. 1-Fig. 2 description according to the specific structure of the rotary compressor 100 of the utility model embodiment.

It as Figure 1-Figure 2, include shell 1 and compressor according to the rotary compressor of the utility model embodiment 100 Structure, the bottom of shell 1 have oil sump 19, have lubricating oil in oil sump 19.

Compression mechanism includes: cylinder 8, bearing, piston 11, slide plate 8h and plunger 12, and bearing fit is in the end face of cylinder 8 On, piston 11 is movably located in cylinder 8, and the peripheral wall of cylinder 8 is equipped with sliding vane groove, and slide plate 8h movably cooperates in slide plate In slot, the inner end of slide plate 8h is connected with piston 11.As shown in Figure 1, rotary compressor 100 has exhaust outlet 2 and air entry 3, Exhaust outlet 2 be located on shell 1 and be connected to inside shell 1, air entry 3 is located at the inlet of the liquid storage device 4 outside shell 1.Compression Mechanism is located in shell 1, and there is compression mechanism gas vent 8d and suction hole 8s, suction hole 8s to pass through air intake duct 5 and liquid storage device 4 Outlet.In the example of fig. 1, rotary compressor 100 is vertical compressor, and the upper and lower end face of cylinder 8 is respectively equipped with Bearing 9 and lower bearing 10, gas vent 8d and suction hole 8s are equipped on cylinder 8, and gas vent 8d passes through corresponding position on upper bearing (metal) 9 Hole and shell 1 inside be connected to.

Rotary compressor 100 further includes the motor 6 and crankshaft 7 being located in shell 1, motor 6 by crankshaft 7 with Piston 11 be connected, crankshaft 7 by with bearing fit to be supported.

11 housing of piston is on crankshaft 7, the end face of the circumferential inner surface of the circumferential outer surface of piston 11 and cylinder 8, bearing Between collectively form compression chamber 8c.Motor 6, crankshaft 7, cylinder 8, bearing are respectively positioned on same root central axes, when motor 6 is logical When electric, band dynamic crankshaft 7 rotates, and crankshaft 7 is eccentrically rotated in cylinder 8 with piston 11 in turn, forms compressor volume Cyclically-varying, to realize compression to the refrigerant gas sucked by suction hole 8s, compressed refrigerant gas via Gas vent 8d is discharged into shell 1, and then is discharged outside compressor via the exhaust outlet of compressor 2.

Bearing is equipped with plunger cavity 10c, and plunger cavity 10c has opening 10a on the end face towards cylinder 8, goes back in bearing The first by-pass prot 10b equipped with connection plunger cavity 10c.Plunger 12 is movably arranged at column between the first stop and the second stop Intracavitary 10c is filled in, the first stop refers to that closest approach of the plunger 12 apart from cylinder 8, the second stop refer to plunger 12 apart from cylinder 8 farthest point.Wherein, one end of the separate cylinder 8 of plunger cavity 10c can enter or flow out lubricating oil, when lubricating oil enters column When filling in chamber 10c, drive plunger 12 mobile to block the first by-pass prot 10b towards the first stop, rotary compressor 100 is holding entirely It works under amount operating status, as outflow of lubrication oil plunger cavity 10c, drives plunger 12 mobile to open the towards the second stop Bypass hole 10b, rotary compressor 100 work under portion capacity operating status.

It should be noted that when plunger 12 blocks the first by-pass prot 10b, at this moment sucking refrigerant in compression chamber 8c can be with All participating in compression, that is to say, that rotary compressor 100 at this time is in full capacity operational mode, and when the first by-pass prot 10b is connected to plunger cavity 10c, so that some is entered first by the refrigerant for sucking compression chamber 8c when being connected to compression chamber 8c By-pass prot 10b, so that only some participates in compression in the refrigerant of sucking, that is to say, that at this time at rotary compressor 100 In portion capacity motor pattern.To sum up, the movement of plunger 12 realizes the transfiguration operation of rotary compressor 100.

According to the rotary compressor 100 of the utility model embodiment, by using flowing into and out for lubricating oil, to control The movement of plunger 12 processed enables plunger 12 to block the first by-pass prot 10b, and rotary compressor 100 is in full capacity operating status Lower work, can also make plunger 12 open the first by-pass prot 10b, and rotary compressor works under portion capacity operating status.

Driving force using the oil pressure of lubricating oil as plunger 12, one side lubricating oil have the characteristics that sealing effect is good, Compression chamber 8c gas leakage at plunger cavity 10c when avoiding working under full capacity operating status guarantees that capacity is maximum in this state；Separately One side lubricating oil can lubricate plunger 12, reduce the trembling on the move of plunger 12.It is compared due to lubricating oil and uses refrigerant For gas, also have many advantages, such as that no throttle effect, pressure stability are good.

Therefore, compared to the conventional positive displacement compressor for carrying out capacity switching using high pressure gas, the utility model embodiment Positive displacement compressor due to the signal that is switched using extreme pressure lubricant as capacity, there are 12 flexible movements of plunger, plunger The switching of 12 positions is accurate and reliable, plunger 12 in plunger cavity 10c will not play, Suck and exhaust pressure will not be caused in handoff procedure The advantages that fluctuation.And compared to the compressor for only controlling transfiguration by twin-tub, the rotary pressure of the utility model embodiment Contracting machine 100 saves a cylinder and partition, reduces mechanical friction loss, more compact structure, and cost is lower.

In some embodiments, as shown in Figure 1, rotary compressor 100 further include: triple valve 15, triple valve 15 have Three interfaces and two kinds of connected states, three interfaces are respectively first interface 15a, second interface 15b and third interface 15c, and One interface 15a is connected into low pressure refrigerant gas, and second interface 15b is connected with one end of the separate cylinder 8 of plunger cavity 10c, third Interface 15c is connected with oil sump 19, and second interface 15b is connected to one in first interface 15a and third interface 15c.

Certainly, also there is triple valve 15 control element 15d, control element 15d to control second interface 15b at which kind of With which orifice.

There are two types of connected states for the tool of triple valve 15: under the first connected state, third interface 15c and second interface 15b connect Logical, first interface 15a is closed；Under the second connected state, first interface 15a is connected to second interface 15b, third interface 15c It closes.

Triple valve 15 can be any in mechanical triple valve, Pneumatic three-way valve, three-way solenoid valve or electric T-shaped valve Kind.Typically, triple valve 15 is three-way solenoid valve, and control element 15d is electromagnetic coil at this time, when electromagnetic coil no power, Triple valve 15 is in the first connected state；When the solenoid is activated, triple valve 15 is in the second connected state.

Optionally, rotary compressor 100 further include: the first capillary 16, one end of the first capillary 16 and cylinder 8 Suction hole 8s be connected, the other end of the first capillary 16 is connected with first interface 15a.Wherein, triple valve 15 is located at shell 1 Outside, the first capillary 16 are needed across shell 1.

Optionally, rotary compressor 100 further include: the second capillary 17, one end of the second capillary 17 and plunger cavity 10c is connected, and the other end of the second capillary 17 passes through shell 1 and is connected with second interface 15b.

Optionally, rotary compressor 100 further include: third capillary 18, one end of third capillary 18 and oil sump 19 It is connected, the other end of third capillary 18 passes through shell 1 and is connected with third interface 15c.In Fig. 1, third capillary 18 is opened Mouth extends down into oil sump 19.

In some embodiments, rotary compressor 100 is vertical compressor, and plunger 12 is provided at the lower end of cylinder 8 In the lower bearing 10 in face, plunger cavity 10c is vertically arranged, and plunger 12 moves in the up-down direction, and lubricating oil can enter or flow The bottom of plunger 12 out.Plunger 12 is the first stop, also referred to as top dead centre when being located at the top.When plunger 12 is located at bottom For the second stop, also referred to as lower dead center.Plunger 12 is arranged in lower bearing 10, lower bearing 10 and below can be made full use of Space, the operations such as topology layout, piping connection are easier to.

Specifically, as depicted in figs. 1 and 2, cylinder 8 has the second by-pass prot 8b, one end of the second by-pass prot 8b and air-breathing Hole 8s connection, the other end of the second by-pass prot 8b are connected to the first by-pass prot 10b.In this way in 11 compressed gas refrigerant of piston In the process, portion gas refrigerant can be flowed into suction hole 8s by plunger cavity 10c, the first by-pass prot 10b, the second by-pass prot 8b In, gas can enter liquid storage device 4 along air intake duct 5 and cache.Such setting can make full use of the space of liquid storage device 4 slow Gas is deposited, and by the way that the second by-pass prot 8b is arranged on cylinder 8, to be connected to the first by-pass prot 10b and suction hole 8s, not needed By-pass line is set, and structure is simplified.

In some embodiments, as shown in Figure 1, plunger cavity 10c is cylindrical cavity, and plunger cavity 10c is ladder-like, plunger The lower section diameter of chamber 10c is greater than the upper diameter of plunger cavity 10c, and the upper section of plunger cavity 10c is connected to the inside of cylinder 8, plunger The side wall of the upper section of chamber 10c is equipped with the first by-pass prot 10b, and the lower section of plunger cavity 10c is opened wide towards the lower end surface of bearing, plunger The lower section of chamber 10c is sealed by baffle 14.The opening 10a of the upper end cavity of plunger cavity 10c constitutes the by-pass prot of pressure chamber chamber 8c.

Specifically, as shown in Figure 1, plunger cavity 10c runs through lower bearing 10, the central axis and lower bearing 10 of plunger cavity 10c Centerline axis parallel.The upper section cavity diameter of plunger cavity 10c is smaller, and opening 10a and compression chamber 8c is communicated.Plunger cavity 10c Lower section cavity diameter it is larger, opening be equipped with baffle 14, on baffle 14 be equipped with aperture, aperture run through baffle 14.

Further, as shown in Figure 1, plunger 12 is cylinder, the bottom of plunger 12 is equipped with convex edge, and the upper section of plunger 12 can Movably cooperate in the upper section of plunger cavity 10c, the lower section of plunger 12 movably cooperates in the lower section of plunger cavity 10c.

That is, ladder circle columnar plunger 12 is installed in plunger cavity 10c, the lesser one end position of the diameter of plunger 12 In in the lesser upper section cavity of diameter of plunger cavity 10c；The one end of plunger 12 being relatively large in diameter is located at the diameter of plunger cavity 10c In biggish lower section cavity.The end diameter of plunger 12 is approximately equal to the upper section cavity diameter of plunger cavity 10c, optionally, plunger Clearance fit between 12 small end and the upper section cavity of plunger cavity 10c.The outside diameter of plunger 12 is nearly equal to plunger cavity 10c's Lower section cavity diameter, optionally, the big end of plunger 12 and the lower section cavity gap of plunger cavity 10c cooperate.

Specifically, when plunger 12 is located at the top, the upper surface of plunger 12 is concordant with the upper surface of lower bearing 10, or The upper surface of plunger 12 is located at below the upper surface of lower bearing 10；When plunger 12 is located at bottom, the upper surface position of plunger 12 In in the upper section of plunger cavity 10c.

That is, the small end height of plunger 12 is determined by the following conditions: when plunger 12 is located at top dead centre, plunger 12 Upper surface be not higher than lower bearing 10 upper surface；When plunger 12 is located at lower dead center, the upper surface of plunger 12 is not less than plunger The lower end surface of the upper section cavity of chamber 10c.

In certain embodiments, rotary compressor 100 further includes spring 13 of the housing on plunger 12, spring The upper surface of the convex edge of the upper surface of the lower section cavity of plunger cavity 10c and the lower end of plunger 12 is only supported at 13 both ends respectively.

Spring 13 can guarantee that plunger 12 is more reliably achieved the capacity switching of rotary compressor 100, by spring 13 Housing advantageously ensures that motion credibility on plunger 12.

Specifically, on 13 sets of spring lesser one end of diameter in plunger 12, the both ends of spring 13 are respectively by plunger cavity The upper surface of the lower section cavity of 10c and the upper surface of baffle 14 are limited.The setting of convex edge on plunger 12 makes spring 13 can be with It is only against on the convex edge of 12 lower end of plunger.

More specifically, as shown in Figure 1, plunger cavity 10c upper section cavity side be equipped with the first by-pass prot 10b, and The second by-pass prot 8b connection on cylinder 8, i.e. the first by-pass prot 10b are connected with the second suction hole 8s of cylinder 8.

As shown in Figure 1, lower part in shell 1 is oil sump 19, oil sump 19 has free pasta 19a, pasta 19a with Down it is the lubricating oil of liquid, is then the gaseous space full of refrigerant on the top of pasta 19a.

Optionally, lower bearing 10 is immersed in the lubricating oil of oil sump 19, and baffle 14 is immersed in lubricating oil, i.e., baffle 14 is located at oil The lower section of face 19a.One end of second capillary 17 is communicated by the lower cavity of aperture and plunger cavity 10c among baffle 14.

In order to be more clearly understood that above scheme, compressor is described below with reference to Fig. 1 and specific embodiment shown in Fig. 2 The course of work.Wherein Fig. 2 is the top view inside cylinder 8, and wherein arrow meaning is direction of rotation, label 7,8,8s, 8c, 8d, The identical of label is corresponded in the element and Fig. 1 of the meaning such as 10a, 11, only visual angle is different.Where 8h is segmentation suction hole 8s The slide plate of volume and the place gas vent 8d volume, slide plate 8h are not shown in Fig. 1.

As shown in Fig. 2, the rotor band dynamic crankshaft 7 of motor 6 rotates, and crankshaft 7 drives live in turn when motor 6 is powered Plug 11 rotates in cylinder 8.When piston 11 rotates, refrigerant gas is sucked from suction hole 8s, after overcompression, from gas vent Cylinder 8 is discharged in 8d.First by-pass prot 10a is located on lower bearing 10, and the first by-pass prot 10a is located at from suction hole 8s to gas vent 8d Between position.When the first by-pass prot 10a is closed, the gas sucked from suction hole 8s will be compressed to gas vent 8d and just be discharged Cylinder 8, whole volumes of cylinder 8 both participate in gas compression at this time, and compressor operating is in full capacity state；When the first by-pass prot When 10a is opened, it will bypass via the first by-pass prot 10a from the gas of suction hole 8s sucking cylinder, at this time only by first Gas after through-hole 10a (along direction of rotation) can be compressed, and cylinder 8 then is discharged from gas vent 8d, and from suction hole 8s There is no compressed gas to the volume between the first by-pass prot 10a, the displacement for being equivalent to compressor reduces, therefore compressor operating In portion capacity state.

Opening and closing for the first by-pass prot 10a, conventional positive displacement compressor using the variation of gas pressure come into Row control, concrete implementation method can refer to related art scheme.Different from conventional positive displacement compressor, the utility model is implemented Technical solution described in example realizes the opening and closing of the first by-pass prot 10a using the variation of fuel injection pressure signal, to realize pressure Contracting machine runs the switching between portion capacity operational mode in full capacity.It is specific as follows:

(1) full capacity operational mode

When triple valve 15 is in the first connected state, the second interface 15b of triple valve 15 is connected to third interface 15c, First interface 15a is closed, and the compressor is when motor 6 is powered with full capacity mode operation.

When motor 6 is powered, the rotor band dynamic crankshaft 7 of motor 6 rotates, and crankshaft 7 is in turn with piston 11 in cylinder 8 Middle rotation, compression are drawn into the gas in cylinder 8 from suction hole 8s, increase gas pressure, be then drained into from gas vent 8d The inner space of compressor housing 1 after being discharged into shell 1 due to gas, makes the refrigerant gas that high pressure is full of inside shell 1 Body is high back pressure that is, in shell.Since the pressure action of high pressure gas is in the lubrication on oil level 19a, in oil sump 19 Oil is also at high pressure conditions.Simultaneously as when piston 11 operates, the pressure in cylinder 8 be from suction hole 8s to gas vent 8d by It is cumulative big, and the first by-pass prot 10a is located at suction hole 8s to the middle position of gas vent 8d, therefore the first by-pass prot 10a general In a certain intermediate pressure.

Under this operational mode, since second interface 15b is connected to third interface 15c, the high-tension lubrication in oil sump 19 Oil will pass through third capillary 18, the third interface 15c of triple valve 15, the second interface 15b of triple valve 15, the second capillary 17, the aperture among baffle 15 generates hydraulic thrust, this thrust in the lower end of plunger 12 into the lower cavity of plunger cavity 10c Overcome the sum of intermediate pressure, spring force and the plunger gravity at 12 the first by-pass prot 10a of top of plunger, plunger 12 can be made to rise to Top dead centre blocks the communication path of opening 10a and the first by-pass prot 10b on lower bearing 10, so that the gas sucked in cylinder 8 Body cannot return to air entry 8s via opening 10a, the first by-pass prot 10b, the second by-pass prot 8b, and whole volumes in cylinder 8 are equal Gas compression is participated in, i.e., compressor operating is in full capacity operational mode.

(2) portion capacity operational mode

When triple valve 15 is in the second connected state, the first interface 15a of triple valve is connected to second interface 15b, the Three interface 15c are closed, and the compressor is run when motor 6 is powered with partial capacity mode.

When motor 6 is powered, the rotor band dynamic crankshaft 7 of motor 6 rotates, and crankshaft 7 is in turn with piston 11 in cylinder 8 Middle rotation, and gas is sucked from suction hole 8s, after overcompression, gas is discharged to gas vent 8d.When piston 11 operates, cylinder 8 Interior pressure is (arrow direction with reference to shown in Fig. 2) being gradually increased from suction hole 8s to gas vent 8d, and the 10a that is open is located at suction Stomata 8s is to the middle position of gas vent 8d, therefore the pressure at the 10a that is open will be above the suction at suction hole 8s, but lower than row Pressure at stomata 8d.

Under this operational mode, since first interface 15a is connected to second interface 15b, and third interface 15c is closed, Extreme pressure lubricant in oil sump 19 cannot be entered in triple valve 15 by capillary 18.Because suction hole 8s is in low pressure shape State has swabbing action to the higher lubricating oil of pressure, and then the original lubricating oil in high pressure conditions of 12 lower end of plunger will By aperture among baffle 15, the second capillary 17, the second interface 15b of triple valve 15, triple valve 15 first interface 15a, the first capillary 16, are sucked into suction hole 8s.As the lubricating oil of 12 lower end of plunger is gradually pumped, plunger 12 will not Disconnected decline.And the gravity of the thrust and plunger 12 of spring 13 itself, plunger 12 will be helped to decline.To the lubrication of 12 lower part of plunger When oil is all taken away, plunger 12 drops to lower dead center, while the gas pressure at 12 top of plunger and the thrust of spring 13 ensure Plunger 12 maintains lower dead center.The opening 10a at 12 top of plunger is opened at this time, and the gas at the 10a that is open can be via the first bypass Hole 10b, the second by-pass prot 8b return to suction hole 8s.Gas pressure is not engaged in from the volume suction hole 8s to opening 10a Contracting, and only take part in gas compression from the volume opening 10a to gas vent 8d, the volume of cylinder not all of, Therefore at this time compressor operating in portion capacity operational mode.Due to entering the lubricants capacity of suction hole 8s from the first capillary 16 It is minimum, therefore will not influence the normal compression of gas in cylinder 8.

The lubricating oil for returning to suction hole 8s from the first capillary 16 enters cylinder 8 after mixing with suction gas, in cylinder 8 The middle lubrication participated between piston 11 and cylinder wall, last and exhaust is together out of, gas vent 8d is discharged into compressor shell 1. In shell 1, a small amount of lubricating oil will continue to be discharged outside compressor housing 1 through exhaust outlet of compressor 2 together with being vented, and most Compressor is returned from compressor air suction mouth 3 eventually, and most of lubricating oil then separates directly in shell 1 with gas, and in gravity Under the action of fall to compression motor spindle oil sump 19 in, to complete the recycling of lubricating oil.

In the above-described embodiments, the spring 13 in plunger cavity 10c is optional, if without spring, only on plunger 12 Pressure difference between 12 bottom of pressure and plunger of the gas in portion can also make plunger 12 drop to lower dead center, to keep compressor steady Surely it works in portion capacity state.

According to a kind of refrigerated air-conditioning system of the utility model embodiment, including according to the utility model above-described embodiment Rotary compressor 100.

Due to being provided with the rotary compressor 100 of above-described embodiment, refrigerated air-conditioning system transfiguration switching action spirit Pressure oscillation is small in living, accurate and reliable, handoff procedure.

In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ", The description of " example ", " specific example " or " some examples " etc. means specific features described in conjunction with this embodiment or example, knot Structure, material or feature are contained at least one embodiment or example of the utility model.In the present specification, to above-mentioned art The schematic representation of language may not refer to the same embodiment or example.Moreover, description specific features, structure, material or Person's feature can be combined in any suitable manner in any one or more of the embodiments or examples.

While there has been shown and described that the embodiments of the present invention, it will be understood by those skilled in the art that: These embodiments can be carried out with a variety of variations, modification, replacement in the case where not departing from the principles of the present invention and objective And modification, the scope of the utility model are defined by the claims and their equivalents.

Claims (10)

1. a kind of rotary compressor characterized by comprising

Shell, the bottom of the shell have oil sump, have lubricating oil in the oil sump；

Compression mechanism, the compression mechanism are located in the shell, and the compression mechanism includes:

The peripheral wall of cylinder, the cylinder is equipped with sliding vane groove；

Bearing, for the bearing fit in the end face of the cylinder, the bearing is equipped with plunger cavity, and the plunger cavity is towards institute Stating has opening on the end face of cylinder, be additionally provided with the first by-pass prot for being connected to the plunger cavity in the bearing；

Piston, the piston are movably located in the cylinder；

Slide plate, the slide plate movably cooperate in the sliding vane groove, and the inner end of the slide plate is connected with the piston；

Plunger, the plunger are movably arranged in the plunger cavity between the first stop and the second stop, and described first stops Point refers to the plunger apart from the cylinder closest approach, and second stop refers to the plunger apart from the cylinder farthest point；Wherein,

One end far from the cylinder of the plunger cavity can enter or flow out the lubricating oil, when the lubricating oil enters institute When stating plunger cavity, drive the plunger mobile to block first by-pass prot, the rotary pressure towards first stop Contracting machine works under full capacity operating status, when the plunger cavity described in the outflow of lubrication oil, drives the plunger described in Second stop is mobile to open first by-pass prot, and the rotary compressor works under portion capacity operating status.

2. rotary compressor according to claim 1, which is characterized in that the rotary compressor is vertical compression Machine, the bearing include the upper bearing (metal) and lower bearing for being respectively provided at the two sides up and down of the cylinder, and the plunger is provided at institute It states in the lower bearing of the lower end surface of cylinder, the plunger cavity is vertically arranged, and the plunger moves in the up-down direction, institute State the bottom that lubricating oil can enter or flow out the plunger.

3. rotary compressor according to claim 2, which is characterized in that the plunger cavity is cylindrical cavity, and described The lower section diameter of plunger cavity is greater than the upper diameter of the plunger cavity, the inside company of the upper section of the plunger cavity and the cylinder Logical, the side wall of the upper section of the plunger cavity is equipped with first by-pass prot, and the lower section of the plunger cavity is towards the lower bearing Lower end surface open wide, the lower section of the plunger cavity passes through guard seal.

4. rotary compressor according to claim 3, which is characterized in that the plunger is cylinder, the plunger Bottom is equipped with convex edge, and the upper section of the plunger movably cooperates in the upper section of the plunger cavity, and the lower section of the plunger can Movably cooperate in the lower section of the plunger cavity；

When the plunger is located at the top, the upper surface of the plunger is concordant or described with the upper surface of the lower bearing The upper surface of plunger is located at below the upper surface of the lower bearing；

When the plunger is located at bottom, the upper surface of the plunger is located in the upper section of the plunger cavity.

5. rotary compressor according to claim 1, which is characterized in that the cylinder has suction hole and the second bypass The one end in hole, second by-pass prot is connected to the suction hole, the other end of second by-pass prot and first bypass Hole connection.

6. rotary compressor according to claim 3, which is characterized in that further include bullet of the housing on the plunger The upper end of the upper surface of the lower section cavity of the plunger cavity and the convex edge of the plunger is only supported at spring, the both ends of the spring respectively Face.

7. rotary compressor according to claim 1, which is characterized in that further include: triple valve, the triple valve have Three interfaces and two kinds of connected states, three interfaces are respectively first interface, second interface and third interface, and described first Interface is connected into low pressure refrigerant gas, and the second interface is connected with one end far from the cylinder of the plunger cavity, described Third interface is connected with the oil sump, and the second interface is connected to one in the first interface and the third interface.

8. rotary compressor according to claim 7, which is characterized in that further include:

One end of first capillary, first capillary is connected with the suction hole of the cylinder, first capillary it is another One end is connected with the first interface；

One end of second capillary, second capillary is connected with the plunger cavity, the other end of second capillary with The second interface is connected；

One end of third capillary, the third capillary is connected with the oil sump, the other end of the third capillary and institute Third interface is stated to be connected.

9. rotary compressor according to claim 3, which is characterized in that the lower bearing is immersed in the lubrication of the oil sump In oil, the baffle is equipped with the aperture for entering or flowing out the lubricating oil.

10. a kind of refrigerated air-conditioning system, which is characterized in that including rotary pressure according to claim 1 to 9 Contracting machine.