CN208348065U - Compressor and air-conditioning system - Google Patents

Abstract

The utility model provides a kind of compressor and air-conditioning system.Compressor includes: the first cylinder, the first air entry and first row port is provided on the first cylinder, first row port with predetermined heat exchanger for connecting；Second cylinder is provided with the second air entry and second exhaust port on the second cylinder, and second exhaust port with predetermined heat exchanger for connecting；Prerelease device, prerelease device is arranged on the cylinder body of the first cylinder or on the upper surface of the first cylinder or on the lower end surface of the first cylinder, prerelease device includes the first control valve of prerelease mouth and control prerelease mouth opening and closing, and prerelease mouth is connect with the second air entry.The compressor of the utility model can increase substantially small cylinder volume when twin-tub operation, so that difficulty of processing when duplex cylinder compressor is applied to low capacity compressor is greatly lowered, simultaneously because the increase of small cylinder volume, can be effectively improved the efficiency of small cylinder.

Description

Compressor and air-conditioning system

Technical field

The utility model relates to air-conditioning technical fields, in particular to a kind of compressor and air-conditioning system.

Background technique

Gas-supplying enthalpy-increasing technology has become the key technology for solving the problems, such as that rotor compressor is applied in cold district performance degradation. Currently, tonifying Qi technology commonly used on rotor compressor is mainly two-stage enthalpy increasing and twin-tub increasing enthalpy.Research shows that: twin-tub For increasing enthalpy technology under high pressure ratio operating condition, tonifying Qi effect is suitable with Two-stage Compression, and under medium and small pressure ratio operating condition, tonifying Qi effect is better than Twin-stage.

The patent of Patent No. 201710632120.7 designs the volumetric ratio of conventional twin-tub enthalpy-increasing compressor, and Achieve preferable effect, but its main problem is: the air-breathing of a cylinder of twin-tub enthalpy-increasing compressor all derives from tonifying Qi, And the gas flow of tonifying Qi is relatively fewer, and pressure belongs to middle compression refrigerant, therefore leads to the cylinder body volume very little, generally separately / 10th or so of an outer cylinder displacement.

Obviously, two cylinders are that the volumetric ratio of 10:1 will lead to series of problems, first, small cylinder inefficient；Second, small displacement compression Machine is relatively difficult to achieve, this is because compressor displacement hour, it is desirable that small cylinder is very small, and difficulty of processing is big.

In addition, there is also the switching problems of cylinder bodies different under different operational modes for twin-tub enthalpy-increasing compressor, this is because small Under pressure ratio operating condition, tonifying Qi is ineffective, and at this moment aeration valve will be cut off, and small cylinder will be needed from evaporator outlet air-breathing.

The patent of Patent No. 201510760115.5 proposes a kind of device that a similar triple valve is connect in outside, can Duplex cylinder compressor is switched into single-stage operation and twin-tub increasing enthalpy runs two ways.However, which needs outside compressor Increase switching device, increase the complexity of system, duplex cylinder compressor under medium and small pressure ratio, tonifying Qi effect be better than twin-stage, and Performance is better than twin-stage by a relatively large margin when not tonifying Qi, but duplex cylinder compressor is due to belonging to parallel-connection structure, under high pressure ratio, volumetric efficiency It is poor, therefore its overall performance is not so good as twin-stage under high pressure ratio.

Utility model content

The main purpose of the utility model is to provide a kind of compressor and air-conditioning systems, to solve the twin-tub of the prior art The small problem of the volume of size cylinder in enthalpy-increasing compressor.

To achieve the goals above, one aspect according to the present utility model provides a kind of compressor, the compressor packet Include: the first cylinder is provided with the first air entry and first row port on first cylinder, the first row port be used for it is pre- Determine heat exchanger connection；Second cylinder is provided with the second air entry and second exhaust port, the second exhaust on second cylinder Mouth with the predetermined heat exchanger for connecting；First cylinder is arranged in prerelease device, the prerelease device On cylinder body or on the upper surface of first cylinder or on the lower end surface of first cylinder, the prerelease device includes mentioning Front-seat port and the first control valve for controlling the prerelease mouth opening and closing, the prerelease mouth and second air entry connect It connects.

Further, first cylinder and second cylinder are rotator type, piston type, any group of vortex form It closes.

Further, it is connected between the prerelease mouth and second air entry by the compressor inner passage Or it is connected by pipeline.

Further, the volumetric ratio of second cylinder and first cylinder is in the range of 0.1 to 0.7.

Further, the compressor further include: interface channel, the first end of the interface channel and the first exhaust Mouth connection, the second end of the interface channel are connected to second air entry；Switching control valve group, the switching control valve group Setting makes the compressor operating in two-stage enthalpy increasing operational mode or twin-tub increasing enthalpy between first cylinder and the second cylinder Mode or unloaded mode of operation.

Further, the switching control valve group includes: the second control valve, and second control valve is arranged in the connection The on-off of the interface channel is controlled on channel；Third control valve, the third control valve are arranged in the first row port The on-off of the refrigerant pipe is controlled on the refrigerant pipe connecting with the predetermined heat exchanger；Wherein, second control valve is opened, When third control valve is closed, for first control valve since back pressure effect is in close state always, the compressor is in double Grade increasing enthalpy operational mode；When second control valve is closed, and third control valve is opened, when in the compression chamber of first cylinder When pressure is greater than second vapor injection pressure, first control valve is since differential pressure action is opened, the part system in first cylinder Cryogen is discharged, and is sucked by the second air entry of second cylinder, and the compressor is in twin-tub increasing enthalpy operation mould at this time Formula；When second control valve is closed, the third control valve is opened, and when aeration valve is closed in gas tonifying branch, when described the First control when compression cavity pressure of one cylinder reaches the back pressure of the prerelease mouth, on the prerelease mouth Valve is opened, at this point, the compressor is in unloaded mode of operation.

Further, second control valve and the third control valve are shut-off valve.

Another aspect according to the present utility model, provides a kind of air-conditioning system, including compressor, and the compressor is upper The compressor stated.

Further, the air-conditioning system further includes gas-liquid separator, First Heat Exchanger, the second heat exchanger, first throttle Element, the second restricting element, wherein the entrance of the First Heat Exchanger and the first row port and the second exhaust port are equal Connection, the outlet of the First Heat Exchanger are connect with the entrance of the first throttle element, the outlet of the first throttle element It is connect with the entrance of the gas-liquid separator, the entrance of the outlet at bottom of the gas-liquid separator and second restricting element connects It connects, the outlet of second restricting element is connect with the entrance of second heat exchanger, the outlet of second heat exchanger and institute State the connection of the first air entry, the First Heat Exchanger forms the predetermined heat exchanger, the top exit of the gas-liquid separator with The second air entry connection.

Further, the air-conditioning system includes comprising twin-tub increasing enthalpy mode, when the air-conditioning system is in twin-tub increasing enthalpy When mode, refrigerant becomes after first cylinder of the compressor and second cylinder discharge through the First Heat Exchanger For high-pressure sub-cooled liquid, the gas-liquid separator is entered after the first throttle element；Freeze in the gas-liquid separator Agent is divided into two-way, and refrigerant liquid enters second restricting element throttling through the gas-liquid separator outlet at bottom and becomes all the way Low pressure two phase refrigerant enters second heat exchanger, and low pressure two phase refrigerant is evaporated in second heat exchanger becomes gaseous state Refrigerant is sucked by first cylinder；Another way refrigerant gas in the gas-liquid separator is through the gas-liquid separator Top exit, with from the refrigerant that the prerelease device is discharged mix after by second cylinder suck.

Further, when the air-conditioning system is in twin-tub increasing enthalpy mode, the first cylinder compression process are as follows: from institute The first cylinder rotary for stating the first cylinder, which is gone at the first cylinder slide plate vertex position, to be started, and is turned in first cylinder rotary Before first air entry, compression process does not start, and first control valve of prerelease device is closed；When first cylinder Rotor from air-breathing closed position go to compression cavity pressure reach position corresponding to intermediate pressure when, the prerelease device The first control valve close, and when the first cylinder rotary go to compression cavity pressure be greater than intermediate pressure corresponding to position when, First control valve of the prerelease device is opened, and prerelease process starts, when first cylinder rotary turns over institute When stating prerelease mouth, prerelease process terminates, and compression chamber continues to compress, when compression cavity pressure reaches first cylinder Pressure at expulsion when, the exhaust process of first cylinder starts, when the first cylinder rotary turns over the first row port, institute Stating the first cylinder exhaust process terminates, and then completes entire circulation.

Further, the air-conditioning system further includes unloaded mode of operation, when air-conditioning system is in unloaded mode of operation: The aeration valve at the top of the gas-liquid separator in gas tonifying branch is closed, high temperature and high pressure gaseous refrigerant becomes through the First Heat Exchanger For high pressure sub-cooled liquid refrigerant, then through the first throttle element enter the gas-liquid separator, at this point, the gas-liquid separation All refrigerants in device become low pressure two phase refrigerant through second restricting element throttling and enter second heat exchanger, It is sucked after the second heat exchanger evaporation by first cylinder；The air-breathing of second cylinder all derives from prerelease dress The exhaust set；When the first cylinder compression chamber back pressure is greater than the second cylinder pressure of inspiration(Pi), the prerelease device The first control valve open, until the first cylinder rotary of first cylinder turns over the prerelease of the prerelease device Mouthful, first control valve is closed.

It is according to the present utility model in another aspect, provide a kind of air-conditioning system, including compressor, the compressor is upper The compressor stated.

Further, the air-conditioning system further includes gas-liquid separator, First Heat Exchanger, the second heat exchanger, first throttle Element, the second restricting element, wherein the entrance of the First Heat Exchanger and the first row port and the second exhaust port are equal Connection, the outlet of second heat exchanger are connect with the entrance of the first throttle element, the outlet of the first throttle element It is connect with the entrance of the gas-liquid separator, the entrance of the outlet at bottom of the gas-liquid separator and second restricting element connects It connects, the outlet of second restricting element is connect with the entrance of second heat exchanger, the outlet of second heat exchanger and institute State the connection of the first air entry, the First Heat Exchanger forms the predetermined heat exchanger, the top exit of the gas-liquid separator with The second air entry connection.

Further, the air-conditioning system includes comprising two-stage enthalpy increasing operational mode, when the air-conditioning system is in twin-stage When increasing enthalpy operational mode, second control valve is opened, and the third control valve is closed, by the institute of the prerelease device The back pressure for stating the valve block of the first control valve is consistently greater than the pressure of compression chamber corresponding to prerelease mouth position, therefore, institute The first control valve for stating prerelease device is closed always；Under the two-stage enthalpy increasing operational mode, refrigerant is from described first The refrigerant of the top exit outflow of refrigerant and the gas-liquid separator of exhaust outlet discharge mix after by second air-breathing Mouth sucking, the high-temperature high-pressure refrigerant come out from the second exhaust port of the compressor are cold through the First Heat Exchanger It is solidifying, become and enters the gas-liquid separation at two phase refrigerant through first throttle element throttling after high pressure sub-cooled liquid refrigerant Device, in the gas-liquid separator, refrigerant is divided into two-way, and bottom liquid is flowed out through the gas-liquid separator outlet at bottom through institute The second restricting element is stated into second heat exchanger, refrigerant evaporates in second heat exchanger becomes gaseous refrigerant quilt The first cylinder sucking；The top exit outflow of gaseous refrigerant in the gas-liquid separator through the gas-liquid separator with It is sucked after the refrigerant mixing of the first cylinder discharge by second air entry, realizes and the two-stage enthalpy increasing of refrigerant is compressed.

Further, the air-conditioning system further includes twin-tub increasing enthalpy operational mode, is increased when the air-conditioning system is in twin-tub When enthalpy operational mode, second control valve is closed, and the third control valve is opened, when the first cylinder compression cavity pressure When greater than prerelease device back pressure, the first control valve of the prerelease device is opened, until the of first cylinder One cylinder rotary turns over the prerelease device, and first control valve is just closed；In twin-tub increasing enthalpy operational mode: refrigeration Agent becomes high-pressure sub-cooled liquid through the First Heat Exchanger after compressor discharge, enters after the first throttle element The gas-liquid separator；Refrigerant is divided into two-way in the gas-liquid separator, wherein refrigerant liquid is through the gas-liquid all the way The outlet at bottom of separator enters second restricting element throttling and enters second heat exchanger as low pressure two phase refrigerant, Low pressure two phase refrigerant is evaporated in second heat exchanger to be become gaseous refrigerant and is sucked by first air entry；The gas Another way refrigerant gas in liquid/gas separator is flowed out through the top exit of the gas-liquid separator, and comes from the prerelease It is sucked after the refrigerant mixing that device is discharged by second air entry.

Further, when the air-conditioning system is in twin-tub increasing enthalpy mode, the first cylinder compression process are as follows: from institute The first cylinder rotary for stating the first cylinder goes to the first cylinder slide plate vertex position and starts, and turns over institute in first cylinder rotary Before stating the first air entry, compression process does not start, and the first control valve of the prerelease device is closed at this time；When described first Cylinder rotary goes to compression cavity pressure from air-breathing closed position and reaches between position corresponding to intermediate pressure, first control Valve processed is closed, and when first cylinder rotary goes to compression cavity pressure and is greater than position corresponding to intermediate pressure, it is described First control valve is opened, and prerelease process starts, at this time with the increase of the first cylinder rotary corner, compression chamber internal pressure Power remains unchanged, and first control valve is still in opening state, when first cylinder rotary turns over the prerelease dress When the prerelease mouth set, prerelease process terminates, and compression chamber continues to compress, when compression cavity pressure reaches the first row When the pressure at expulsion of port, exhaust process starts, when first cylinder rotary turns over the first row port, exhaust process Terminate, and then completes entire circulation.

Further, the air-conditioning system further includes unloaded mode of operation, when the air-conditioning system is in unloading operation mould When formula, the aeration valve on the gas-liquid separator is closed, second control valve is closed, and the third control valve is opened, high temperature High-pressure gaseous refrigerant becomes high pressure sub-cooled liquid refrigerant through the First Heat Exchanger, then enters through the first throttle element The gas-liquid separator becomes middle compression refrigerant, and all refrigerants in the gas-liquid separator are through the second restricting element section Rheology is that low pressure two phase refrigerant enters second heat exchanger, by first air entry after second heat exchanger evaporation Sucking；When the first cylinder compression chamber back pressure is greater than the second cylinder pressure of inspiration(Pi), first control valve is opened, directly The first cylinder rotary to first cylinder turns over prerelease mouth, and the first control valve is closed.

As it can be seen that the utility model by utilizing prerelease technology, provides a kind of novel compressor and air-conditioning system, Compared to traditional twin-tub enthalpy-increasing compressor, the compressor of the utility model can increase considerably the appearance of the first cylinder and the second cylinder Product, so that twin-tub increasing enthalpy technology is applied on low capacity compressor becomes eased；By increasing the first cylinder and the second gas The volume of cylinder is effectively improved the second cylinder, i.e., the efficiency of small cylinder, and then realizes the promotion of performance；In addition, the utility model energy Enough, it can be achieved that the free switching of increasing enthalpy operation and the operation of not increasing enthalpy under the premise of not increasing remaining part；In small pressure ratio operating condition Under, the partial volume of off-loadable duplex cylinder compressor.

The compressor of the utility model can realize the switching between Two-stage Compression and twin-tub independent compression, double so as to take into account The excellent two-fold advantage of the excellent twin-tub high temperature performance of grade low-temp performance, so that compressor can operate in efficiently in a wide range of variable working condition State, thus the runnability of compressor can be effectively improved；Secondly, the compressor proposed can increase substantially when twin-tub is run Small cylinder volume, so that difficulty of processing when duplex cylinder compressor is applied to low capacity compressor is greatly lowered, simultaneously because The increase of small cylinder volume, can be effectively improved the efficiency of small cylinder；Again, due to being provided with prerelease mouth, it can be achieved that compressor increases The free switching of enthalpy operation and the operation of not increasing enthalpy, simultaneously as the operating condition of increasing enthalpy is not substantially small pressure ratio operating condition, therefore passes through Prerelease mouth is released to the second cylinder, the partial volume of off-loadable duplex cylinder compressor.

Detailed description of the invention

The accompanying drawings constituting a part of this application is used to provide a further understanding of the present invention, this is practical Novel illustrative embodiments and their description are not constituteed improper limits to the present invention for explaining the utility model. In the accompanying drawings:

Fig. 1 diagrammatically illustrates the annexation figure of the first embodiment of the air-conditioning system of the utility model；

The compressor that Fig. 2 diagrammatically illustrates the first embodiment of the utility model removes the connection pass after gas-liquid separator System's figure；

The refrigerant that Fig. 3 diagrammatically illustrates when compressor is in twin-tub increasing enthalpy operational mode in Fig. 1 moves towards figure；

The refrigerant that Fig. 4 diagrammatically illustrates when compressor is in unloaded mode of operation in Fig. 1 moves towards figure；

Fig. 5 diagrammatically illustrates the annexation figure of the second embodiment of the air-conditioning system of the utility model；

The compressor that Fig. 6 diagrammatically illustrates the second embodiment of utility model removes the connection relationship after gas-liquid separator Figure；

The refrigerant that Fig. 7 diagrammatically illustrates when the air-conditioning system in Fig. 5 is in two-stage enthalpy increasing operational mode moves towards figure；

The refrigerant that Fig. 8 diagrammatically illustrates when the air-conditioning system in Fig. 5 is in twin-tub increasing enthalpy operational mode moves towards figure；

The refrigerant that Fig. 9 diagrammatically illustrates when the air-conditioning system in Fig. 5 is in unloaded mode of operation moves towards figure；

Figure 10 diagrammatically illustrates top view when the first cylinder corner starting position

Figure 11 diagrammatically illustrates top view when the first cylinder air-breathing closed position；

Figure 12 diagrammatically illustrates bowing for the first cylinder when the prerelease device in the utility model is in the open position View；

Figure 13 diagrammatically illustrate prerelease device in the utility model it is in the close position when the first cylinder bow View；

Figure 14 diagrammatically illustrates the first cylinder when the prerelease device in the utility model is in exhaust enlightenment position Top view；

Figure 15 diagrammatically illustrates the first cylinder when the prerelease device in the utility model is in exhaust end position Top view.

Wherein, the above drawings include the following reference numerals:

1, compressor；2, First Heat Exchanger；3, the second heat exchanger；4, first throttle element；5, gas-liquid separator；6, second Restricting element；11, the first cylinder；111, the first air entry；112, first row port；113, interface channel；114, the first cylinder Rotor；115, the first cylinder slide plate；116, prerelease device；12, the second cylinder；121, the second air entry；122, second row Port；13, the second control valve；14, third control valve.

Specific embodiment

It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase Mutually combination.The utility model will be described in detail below with reference to the accompanying drawings and embodiments.

It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.

It should be noted that the description and claims of this application and term " first " in above-mentioned attached drawing, " Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way Data be interchangeable under appropriate circumstances, so that presently filed embodiment described herein for example can be in addition to herein Sequence other than those of diagram or description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that Be to cover it is non-exclusive include, for example, containing the process, method, system, product or equipment of a series of steps or units not Those of be necessarily limited to be clearly listed step or unit, but may include be not clearly listed or for these processes, side The intrinsic other step or units of method, product or equipment.

For ease of description, spatially relative term can be used herein, as " ... on ", " ... top ", " ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy The spatial relation of sign.It should be understood that spatially relative term is intended to comprising the orientation in addition to device described in figure Except different direction in use or operation.For example, being described as if the device in attached drawing is squeezed " in other devices It will be positioned as " under other devices or construction after part or construction top " or the device of " on other devices or construction " Side " or " under other devices or construction ".Thus, exemplary term " ... top " may include " ... top " and " in ... lower section " two kinds of orientation.The device can also be positioned with other different modes and (is rotated by 90 ° or in other orientation), and And respective explanations are made to the opposite description in space used herein above.

Referring to Fig. 1 to Fig. 4, shown in Figure 10 to Figure 15, first embodiment according to the present utility model provides a kind of air-conditioning System, the air-conditioning system in the present embodiment includes compressor 1, First Heat Exchanger 2, the second heat exchanger 3, first throttle element 4, Two restricting elements 6, gas-liquid separator 5, wherein the entrance and first row port 112 and second exhaust port 122 of First Heat Exchanger 2 It is all connected with, the outlet of First Heat Exchanger 2 is connect with the entrance of first throttle element 4, the outlet of first throttle element 4 and compressor The entrance of 1 gas-liquid separator 5 connects, and the outlet at bottom of gas-liquid separator 5 is connect with the entrance of the second restricting element 6, and second The outlet of restricting element 6 is connect with the entrance of the second heat exchanger 3, and the outlet of the second heat exchanger 3 is connect with the first air entry 111, The top exit of gas-liquid separator 5 is connect with the second air entry 121.Compressor 1 in the present embodiment includes the first cylinder 11, the Two cylinders 12 and prerelease device 116.

When practical connection, the first air entry 111 and first row port 112, first row port are provided on the first cylinder 11 112 with First Heat Exchanger 2 for connecting；It is provided with the second air entry 121 and second exhaust port 122 on second cylinder 12, second Exhaust outlet 122 with First Heat Exchanger 2 for connecting；Prerelease device 116 is arranged on the cylinder body of the first cylinder 11 or first On the upper surface (i.e. on upper flange or intermediate bulkhead) of cylinder 11 or on the lower end surface of the first cylinder 11 (on lower flange), in advance Exhaust apparatus 116 includes prerelease mouth (not shown) and controls the first control valve of prerelease mouth opening and closing (in figure not Show), prerelease mouth is connect with the second air entry 121.

Compressor 1 in the present embodiment includes two kinds of operational modes, is twin-tub increasing enthalpy mode and unloaded mode of operation respectively:

Twin-tub increasing enthalpy mode: as shown in Figures 2 and 3, refrigerant is from two the first cylinders 11 of compressor 1 and the second cylinder 12 Become high-pressure sub-cooled liquid through First Heat Exchanger 2 after discharge, gas-liquid separator 5 is entered after first throttle element 4；In gas-liquid point It is divided into two-way from refrigerant in device 5, wherein bottom refrigerant liquid enters the second restricting element through 5 outlet at bottom of gas-liquid separator 6 throttlings become low pressure two phase refrigerant and enter 3 entrance of the second heat exchanger, and low pressure two phase refrigerant is evaporated in the second heat exchanger 3 Become gaseous refrigerant to be sucked by the first air entry 111 of the first cylinder 11；Another way refrigerant gas in gas-liquid separator 5 Through gas-liquid separator 5 top exit outflow, with from the refrigerant that prerelease device 116 is discharged mix after by second suction Port 121 sucks；In this case, 11 compression process of the first cylinder of compressor 1 are as follows: gone to from the first cylinder rotary 114 First cylinder slide plate, 115 vertex position starts, as shown in Figure 10, before the first cylinder rotary 114 turns over the first air entry 111, Compression process does not start, and the back pressure of prerelease device 116 is intermediate pressure at this time, therefore the place of prerelease device 116 First control valve is closed；Reach intermediate pressure institute when the first cylinder rotary 114 goes to compression cavity pressure from air-breathing closed position Between corresponding position, since compression cavity pressure is less than intermediate pressure, the first control valve is closed, as shown in figure 11, and When the first cylinder rotary 114, which goes to compression cavity pressure, is greater than position corresponding to intermediate pressure, the first control valve is opened, and is mentioned Front exhaust process starts, and as shown in figure 12, at this time with the increase of corner, compression chamber internal pressure power is remained unchanged, the first control valve Still in opening state, when the first cylinder rotary 114 turns over prerelease mouth, the exhaust process of the first cylinder 11 starts, when When first cylinder rotary 114 turns over first row port 112,11 exhaust process of the first cylinder terminates, and then completes entire circulation, such as Shown in Figure 13, compression chamber continues to compress, and when compression cavity pressure reaches pressure at expulsion, the first control valve is opened, exhaust process Start, as shown in figure 14, when the first cylinder rotary 114 turns over first row port 112, exhaust process terminates, as shown in figure 15, And then complete entire circulation；12 compression process of the second cylinder of compressor 1 is consistent with existing compressor, and details are not described herein again.

Unloaded mode of operation: as shown in figure 4, operate under small pressure ratio operating condition when system, in gas-liquid separator 5, gas flow is very When few, system uninstallation operation, specific implementation are as follows: the aeration valve in closing 5 top gas tonifying branch of gas-liquid separator is (in figure not Draw), high temperature and high pressure gaseous refrigerant becomes high pressure sub-cooled liquid refrigerant through First Heat Exchanger 2, then through first throttle element 4 Into gas-liquid separator 5, since the aeration valve on gas-liquid separator 5 is closed, all refrigerants in gas-liquid separator 5 are through second The throttling of restricting element 6 becomes low pressure two phase refrigerant into the second heat exchanger 3, by compressor 1 after the evaporation of the second heat exchanger 3 The sucking of first air entry 111；Since aeration valve at this time is closed, the air-breathing of the second cylinder 12 of compressor 1 will be all from mentioning The exhaust of front-seat device of air 116, the back pressure of the first cylinder 11 of compressor 1 will be determined by the position of prerelease device 116 at this time It is fixed；When 11 compression chamber back pressure of the first cylinder is greater than the second 12 pressure of inspiration(Pi) of cylinder, the first control valve is opened, until the first cylinder Rotor 114 turns over prerelease mouth, and the first control valve is closed；Essentially, increasing enthalpy mode is compared, unloaded mode of operation is only cut Break gas tonifying branch, and since the refrigerant of gas tonifying branch is one of 12 air-breathing source of the second cylinder, after cutting, will be caused Two cylinders, 12 pressure of inspiration(Pi) reduces, while the first control valve will be opened in advance, the reduction amplitude and the first control valve of pressure of inspiration(Pi) The angle for opening prerelease device intercouples, and is both determined by the volumetric ratio of the first cylinder 11 and the second cylinder 12 It is fixed.

As it can be seen that the utility model by utilizing prerelease technology, provides a kind of novel compressor and air-conditioning system, Compared to traditional twin-tub enthalpy-increasing compressor, the compressor of the utility model can increase considerably the first cylinder 11 and the second cylinder 12 Volume, so that twin-tub increasing enthalpy technology is applied on low capacity compressor 1 becomes eased；By increasing the first cylinder 11 and the The volume of two cylinders 12 is effectively improved the second cylinder 12, i.e., the efficiency of small cylinder, and then realizes the promotion of performance；In addition, this reality With it is novel can be under the premise of not increasing remaining part, it can be achieved that the free switching of increasing enthalpy operation and the operation of not increasing enthalpy；Small Under pressure ratio operating condition, the partial volume of off-loadable duplex cylinder compressor.

Preferably, the volumetric ratio of the second cylinder 12 in the present embodiment and the first cylinder 11 is in the range of 0.1 to 0.5, For structure in compared with the existing technology, second cylinder 12 of the present embodiment can be made larger, and it is real to be easier processing It is existing.

Preferably, first throttle element 4 and the second restricting element 6 are throttle valve, certainly, in other of the utility model In embodiment, capillary can also be set by first throttle element 4 and the second restricting element 6, as long as in the utility model Design under other modes of texturing, both be within the protection scope of the present invention.

Referring to shown in Fig. 5 to Figure 15, another embodiment according to the present utility model provides a kind of air-conditioning system, this reality The structure for applying the air-conditioning system in the air-conditioning system and first embodiment in example is almost the same, the difference is that in the present embodiment Compressor 1 further include interface channel 113 and switching control valve group, the first end and first row port 112 of interface channel 113 connect Logical, the second end of interface channel 113 is connected to the second air entry 121；Switching control valve group is arranged in the first cylinder 11 and second Make the work of compressor 1 in two-stage enthalpy increasing operational mode or twin-tub increasing enthalpy mode or unloaded mode of operation between cylinder 12.

Specifically, switching control valve group includes the second control valve 13 and third control valve 14, the setting of the second control valve 13 The on-off of interface channel 113 is controlled on interface channel 113；Third control valve 14 is arranged in first row port 112 and first The on-off of refrigerant pipe is controlled on the refrigerant pipe that heat exchanger 2 connects；Wherein, the second control valve 13 is opened, and third control valve 14 is closed When closing, for the first control valve since back pressure effect is in close state always, compressor 1 is in two-stage enthalpy increasing operational mode；When Two control valves 13 are closed, when third control valve 14 is opened, when the compression cavity pressure of the first cylinder 11 is greater than second vapor injection pressure When, the first control valve is since differential pressure action is opened, and some refrigerant in the first cylinder 11 is discharged, and by the second cylinder 12 The sucking of second air entry 121, compressor 1 is in twin-tub increasing enthalpy operational mode at this time；When the second control valve 13 is closed, third is controlled Valve is opened, and in gas tonifying branch when aeration valve closing, when the compression cavity pressure of the first cylinder 11 reaches the back of prerelease mouth When pressure, the first control valve on prerelease mouth is opened, at this point, compressor 1 is in unloaded mode of operation.

Preferably, the second control valve 13 in the present embodiment and third control valve 14 are shut-off valve, prevent coolant backflow, Certainly, check valve may be arranged as other open and close valves, and the first cylinder 11 and the second cylinder 12 are rotator type, piston type, vortex Any combination of form.Pipe is connected or passed through between prerelease mouth and the second air entry 121 by 1 inner passage of compressor Road connection, specifically can be according to actual structure setting, and structure is simple, is easy to implement.Second cylinder 12 and the first cylinder 11 Volumetric ratio is in the range of 0.5 to 0.7, and relative to first embodiment, the second cylinder 12 in the present embodiment can also be made more It is larger, it is more easier to process and realizes.

The operational mode of air-conditioning system in the present embodiment includes three kinds, is two-stage enthalpy increasing operational mode, twin-tub increasing respectively Enthalpy operational mode and unloaded mode of operation are described as follows its operation logic now in conjunction with Fig. 6 to Figure 15:

Two-stage enthalpy increasing operational mode: Fig. 7 illustrates the systematic schematic diagram of two-stage enthalpy increasing operational mode.In twin-stage operational mode Under, the second control valve 13 is opened, and third control valve 14 is closed；Due to the valve block back of the first control valve of prerelease device 116 Pressure is consistently greater than the pressure of compression chamber corresponding to prerelease mouth position, therefore, the first control of prerelease device 116 Valve is closed always；In this mode, the top of refrigerant is discharged from first row port 112 refrigerant and gas-liquid separator 5 goes out It is sucked after the refrigerant mixing of mouth outflow by 1 second air entry 121 of compressor, is come out from the first row port 112 of compressor 1 High-temperature high-pressure refrigerant is condensed through First Heat Exchanger 2, throttles after becoming high pressure sub-cooled liquid refrigerant through first throttle element 4 Enter gas-liquid separator 5 at two phase refrigerant, in gas-liquid separator 5, refrigerant is divided into two-way, and bottom liquid is through gas-liquid separation The outflow of 5 outlet at bottom of device enters the second heat exchanger 3 through the second restricting element 6, and refrigerant evaporates in the second heat exchanger 3 becomes gas State refrigerant is sucked by the first air entry 111 of compressor 1；Gaseous refrigerant in gas-liquid separator 5 is through gas-liquid separator 5 Top exit outflow is sucked after mixing with the refrigerant that the first cylinder 11 of compressor 1 is discharged by the second air entry of compressor 121, It realizes and the two-stage enthalpy increasing of refrigerant is compressed.

Twin-tub increasing enthalpy operational mode: Fig. 8 illustrates the schematic illustration that air-conditioning system operates under twin-tub increasing enthalpy mode.? Under the mode, the second control valve 13 of compressor 1 is closed, and third control valve 14 is opened；Due to the back pressure of prerelease device 116 For intermediate pressure, and the pressure at expulsion of the first cylinder 11 is greater than the back pressure of prerelease device 116, therefore when the of compressor 1 When one cylinder 11 compresses cavity pressure greater than 116 back pressure of prerelease device, the first control valve of prerelease device 116 is beaten It opens, until the first cylinder rotary 114 of compressor 1 turns over prerelease device 116, the first control valve is just closed；From refrigerant Angle is seen: refrigerant becomes high-pressure sub-cooled liquid through First Heat Exchanger 2 after the discharge of two cylinder bodies of compressor 1, through first segment Enter gas-liquid separator 5 after fluid element 4；Refrigerant is divided into two-way in gas-liquid separator 5, and wherein bottom refrigerant liquid is through gas The outlet at bottom of liquid/gas separator 5 enters the throttling of the second restricting element 6 and enters as low pressure two phase refrigerant into the second heat exchanger 3 Mouthful, low pressure two phase refrigerant is evaporated in the second heat exchanger 3 to be become gaseous refrigerant and is sucked by the first air entry 111；Gas-liquid point From the another way refrigerant gas in device 5 through gas-liquid separator 5 top exit flow out, with come from 116 institute of prerelease device It is sucked after the refrigerant mixing of discharge by the second air entry 121；In this case, the first cylinder 11 of compressor 1 is compressed Journey are as follows: since the first cylinder rotary 114 goes to 115 vertex position of the first cylinder slide plate, as indicated by 10, in the first cylinder rotary Before 114 turn over the first air entry 111, compression process does not start, and the back pressure of prerelease device 116 is intermediate pressure at this time, because First control valve of this prerelease device 116 is closed；When the first cylinder rotary 114 is gone in compression chamber from air-breathing closed position Pressure reaches between position corresponding to intermediate pressure, since compression cavity pressure is less than intermediate pressure, the first control valve It closes, as shown in figure 11, and is greater than position corresponding to intermediate pressure when the first cylinder rotary 114 goes to compression cavity pressure When, the first control valve is opened, and prerelease process starts, and as shown in figure 12, at this time with the increase of corner, compresses cavity pressure It remains unchanged, the first control valve is still in opening state, when the first cylinder rotary 114 turns over prerelease mouth, prerelease Process terminates, and as shown in figure 13, compression chamber continues to compress, and when compression cavity pressure reaches pressure at expulsion, the first control valve is beaten It opens, exhaust process starts, and such as Figure 14, when the first cylinder rotary 114 turns over first row port 112, exhaust process terminates, and such as schemes Shown in 15, and then complete entire circulation；12 compression process of the second cylinder of compressor 1 is consistent with existing compressor, herein no longer It repeats；

Unloaded mode of operation: as shown in figure 9, operate under small pressure ratio operating condition when system, in gas-liquid separator 5, gas flow is very When few, system be in unloaded mode of operation, specific implementation are as follows: the aeration valve on closing gas-liquid separator 5, compressor 1 the Two control valves 13 are closed, and the third control valve 14 of compressor 1 is opened, and high temperature and high pressure gaseous refrigerant becomes through First Heat Exchanger 2 High pressure sub-cooled liquid refrigerant, then become middle compression refrigerant into gas-liquid separator 5 through first throttle element 4, due to aeration valve It closes, all refrigerants in gas-liquid separator 5 become low pressure two phase refrigerant through the throttling of the second restricting element 6 and change into second Hot device 3 is sucked after the evaporation of the second heat exchanger 3 by the first air entry 111 of compressor 1；Since aeration valve is closed at this time, compression The air-breathing of second cylinder 12 of machine 1 is by all from the exhaust of prerelease device 116, the first cylinder of compressor 1 at this time 11 back pressure will be determined by the position of prerelease device 116；When 11 compression chamber back pressure of the first cylinder is inhaled greater than the second cylinder 12 When atmospheric pressure, the first control valve is opened, and until the first cylinder rotary 114 turns over prerelease mouth, the first control valve is closed；Essence On say, compare increasing enthalpy mode, unloaded mode of operation has only been turned off gas tonifying branch, and since the refrigerant of gas tonifying branch is second One of 12 air-breathing source of cylinder after cutting, will cause the reduction of 12 pressure of inspiration(Pi) of the second cylinder, while the first control valve will in advance It opens, the angle of the reduction amplitude of pressure of inspiration(Pi) and the first control valve opening intercouples, both by the first cylinder 11 It is determined with the volumetric ratio of the second cylinder 12.

According to the structure of the present embodiment it is recognised that the advantages of the present embodiment is by combining two-stage enthalpy increasing and twin-tub increasing enthalpy And prerelease technology, propose a kind of duplex cylinder compressor that can be flexibly switched to single-stage, twin-tub increasing enthalpy and two-stage enthalpy increasing And air-conditioning system, the system can run operation twin-tub increasing enthalpy mode under two-stage enthalpy increasing mode, medium and small pressure ratio operating condition under high pressure ratio And small pressure ratio does not run single mode under increasing enthalpy operating condition, and then compressor may make to be efficiently run in a wide range of variable working condition item Under part.

As it can be seen that the compressor of the present embodiment preferably solves the problems, such as that performance is poor under small pressure ratio in double-stage compressor, Also volumetric efficiency difference and delivery temperature can preferably be solved the problems, such as under twin-tub enthalpy-increasing compressor worst cold case, while can also be Under small pressure ratio operating condition, the free switching of twin-tub increasing enthalpy mode and single level system is realized；In addition, also solving twin-tub to a certain extent Unloading problem of the enthalpy-increasing compressor under small pressure ratio.

The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.

Claims (18)

1. a kind of compressor (1) characterized by comprising

First cylinder (11) is provided with the first air entry (111) and first row port (112), institute on first cylinder (11) First row port (112) are stated for connecting with predetermined heat exchanger；

Second cylinder (12) is provided with the second air entry (121) and second exhaust port (122), institute on second cylinder (12) Second exhaust port (122) are stated for connecting with the predetermined heat exchanger；

Prerelease device (116), the prerelease device (116) is arranged on the cylinder body of first cylinder (11) or institute It states on the upper surface of the first cylinder (11) or on the lower end surface of first cylinder (11), prerelease device (116) packet It includes prerelease mouth and controls the first control valve of the prerelease mouth opening and closing, the prerelease mouth and second air-breathing Mouth (121) connection.

2. compressor (1) according to claim 1, which is characterized in that first cylinder (11) and second cylinder It (12) is rotator type, any combination of piston type, vortex form.

3. compressor (1) according to claim 1, which is characterized in that the prerelease mouth and second air entry (121) it is connected between by the compressor (1) inner passage or is connected by pipeline.

4. compressor (1) according to claim 1, which is characterized in that second cylinder (12) and first cylinder (11) volumetric ratio is in the range of 0.1 to 0.7.

5. compressor (1) according to any one of claim 1 to 3, which is characterized in that the compressor (1) further include:

Interface channel (113), the first end of the interface channel (113) are connected to the first row port (112), the connection The second end in channel (113) is connected to second air entry (121)；

Switching control valve group, the switching control valve group setting make institute between first cylinder (11) and the second cylinder (12) Compressor (1) work is stated in two-stage enthalpy increasing operational mode or twin-tub increasing enthalpy mode or unloaded mode of operation.

6. compressor (1) according to claim 5, which is characterized in that the switching control valve group includes:

Second control valve (13), second control valve (13) are arranged on the interface channel (113) to control the connection The on-off in channel (113)；

Third control valve (14), the third control valve (14) are arranged in the first row port (112) and the predetermined heat exchange The on-off of the refrigerant pipe is controlled on the refrigerant pipe of device connection；

Wherein, second control valve (13) is opened, and when third control valve (14) is closed, first control valve is made due to back pressure With being in close state always, the compressor (1) is in two-stage enthalpy increasing operational mode；When second control valve (13) is closed It closes, when third control valve (14) is opened, when the compression cavity pressure of first cylinder (11) is greater than second vapor injection pressure, institute The first control valve is stated since differential pressure action is opened, some refrigerant in first cylinder (11) is discharged, and by described the The second air entry (121) of two cylinders (12) sucks, and the compressor (1) is in twin-tub increasing enthalpy operational mode at this time；When described Second control valve (13) is closed, and the third control valve is opened, and in gas tonifying branch when aeration valve closing, when first cylinder (11) first control valve when compression cavity pressure reaches the back pressure of the prerelease mouth, on the prerelease mouth It opens, at this point, the compressor (1) is in unloaded mode of operation.

7. compressor (1) according to claim 6, which is characterized in that second control valve (13) and the third control Valve (14) processed is shut-off valve.

8. a kind of air-conditioning system, including compressor (1), which is characterized in that the compressor (1) is any in Claims 1-4 Compressor (1) described in.

9. air-conditioning system according to claim 8, which is characterized in that the air-conditioning system further includes gas-liquid separator (5), First Heat Exchanger (2), the second heat exchanger (3), first throttle element (4), the second restricting element (6), wherein first heat exchange The entrance of device (2) is all connected with the first row port (112) and the second exhaust port (122), the First Heat Exchanger (2) Outlet connect with the entrance of the first throttle element (4), the outlet of the first throttle element (4) and the gas-liquid separation The entrance of device (5) connects, and the outlet at bottom of the gas-liquid separator (5) is connect with the entrance of second restricting element (6), institute The outlet for stating the second restricting element (6) is connect with the entrance of second heat exchanger (3), the outlet of second heat exchanger (3) It is connect with first air entry (111), the First Heat Exchanger (2) forms the predetermined heat exchanger, the gas-liquid separator (5) top exit is connect with second air entry (121).

10. air-conditioning system according to claim 9, which is characterized in that the air-conditioning system includes comprising twin-tub increasing enthalpy mould Formula, when the air-conditioning system is in twin-tub increasing enthalpy mode, refrigerant from first cylinder (11) of the compressor (1) and Become high-pressure sub-cooled liquid through the First Heat Exchanger (2) after second cylinder (12) discharge, through the first throttle element (4) enter the gas-liquid separator (5) afterwards；Refrigerant is divided into two-way in the gas-liquid separator (5), all the way refrigerant liquid Entering second restricting element (6) throttling through the gas-liquid separator (5) outlet at bottom becomes the entrance of low pressure two phase refrigerant Second heat exchanger (3), it is described that the evaporation in second heat exchanger (3) of low pressure two phase refrigerant becomes gaseous refrigerant First cylinder (11) sucking；Top of the another way refrigerant gas through the gas-liquid separator (5) in the gas-liquid separator (5) Portion outlet is sucked after the refrigerant that the prerelease device (116) is discharged mixes by second cylinder (12) with coming from.

11. air-conditioning system according to claim 10, which is characterized in that when the air-conditioning system is in twin-tub increasing enthalpy mode When, the first cylinder (11) compression process are as follows: go to the first gas from the first cylinder rotary (114) of first cylinder (11) Start at cylinder slide plate (115) vertex position, before first cylinder rotary (114) turns over first air entry (111), pressure Compression process does not start, and (116) first control valve of prerelease device is closed；When first cylinder rotary (114) is from suction Gas closed position goes to compression cavity pressure when reaching position corresponding to intermediate pressure, the prerelease device (116) First control valve is closed, and is greater than position corresponding to intermediate pressure when the first cylinder rotary (114) go to compression cavity pressure When, the first control valve of the prerelease device (116) is opened, and prerelease process starts, when first cylinder rotary (114) when turning over the prerelease mouth, prerelease process terminates, and compression chamber continues to compress, when compression cavity pressure reaches To first cylinder (11) pressure at expulsion when, the exhaust process of first cylinder (11) starts, when the first cylinder rotary (114) when turning over first row port (112), the first cylinder (11) exhaust process terminates, and then completes entire circulation.

12. air-conditioning system according to claim 9, which is characterized in that the air-conditioning system further includes unloaded mode of operation, When air-conditioning system is in unloaded mode of operation: closing the aeration valve at the top of the gas-liquid separator (5) in gas tonifying branch, high temperature High-pressure gaseous refrigerant becomes high pressure sub-cooled liquid refrigerant through the First Heat Exchanger (2), then through the first throttle element (4) enter the gas-liquid separator (5), at this point, all refrigerants in the gas-liquid separator (5) are through the second throttling member Part (6) throttling becomes low pressure two phase refrigerant and enters second heat exchanger (3), the quilt after second heat exchanger (3) evaporation First cylinder (11) sucking；The air-breathing of second cylinder (12) all derives from the exhaust of prerelease device (116)； When the first cylinder (11) compression chamber back pressure is greater than the second cylinder (12) pressure of inspiration(Pi), the prerelease device (116) the first control valve is opened, until the first cylinder rotary (114) of first cylinder (11) turns over the prerelease The prerelease mouth of device (116), first control valve are closed.

13. a kind of air-conditioning system, including compressor (1), which is characterized in that the compressor (1) is to appoint in claim 6 to 7 Compressor (1) described in one.

14. air-conditioning system according to claim 13, which is characterized in that the air-conditioning system further includes gas-liquid separator (5), First Heat Exchanger (2), the second heat exchanger (3), first throttle element (4), the second restricting element (6), wherein described first The entrance of heat exchanger (2) is all connected with the first row port (112) and the second exhaust port (122), second heat exchange The outlet of device (3) is connect with the entrance of the first throttle element (4), the outlet of the first throttle element (4) and the gas The entrance of liquid/gas separator (5) connects, the entrance of the outlet at bottom of the gas-liquid separator (5) and second restricting element (6) Connection, the outlet of second restricting element (6) are connect with the entrance of second heat exchanger (3), second heat exchanger (3) Outlet connect with first air entry (111), the First Heat Exchanger (2) forms the predetermined heat exchanger, the gas-liquid The top exit of separator (5) is connect with second air entry (121).

15. air-conditioning system according to claim 14, which is characterized in that the air-conditioning system includes transporting comprising two-stage enthalpy increasing Row mode, when the air-conditioning system is in two-stage enthalpy increasing operational mode, second control valve (13) is opened, the third control Valve (14) processed is closed, since the back pressure of the valve block of first control valve of the prerelease device (116) is consistently greater than institute The pressure of compression chamber corresponding to prerelease mouth position is stated, therefore, the first control valve of the prerelease device (116) is always It closes；Under the two-stage enthalpy increasing operational mode, refrigerant and the gas that refrigerant is discharged from the first row port (112) It is sucked after the refrigerant mixing of the top exit outflow of liquid/gas separator (5) by second air entry (121), from the compressor (1) high-temperature high-pressure refrigerant that the second exhaust port (122) comes out is condensed through the First Heat Exchanger (2), becomes high Enter the gas-liquid separator (5) at two phase refrigerant through the first throttle element (4) throttling after pressure sub-cooled liquid refrigerant, In the gas-liquid separator (5), refrigerant is divided into two-way, and bottom liquid is flowed out through the gas-liquid separator (5) outlet at bottom Enter second heat exchanger (3) through second restricting element (6), refrigerant evaporation in second heat exchanger (3) becomes It is sucked for gaseous refrigerant by first cylinder (11)；Gaseous refrigerant in the gas-liquid separator (5) is through the gas-liquid Separator (5) top exit outflow mixed with the refrigerant that first cylinder (11) is discharged after by second air entry (121) it sucks, realizes and the two-stage enthalpy increasing of refrigerant is compressed.

16. air-conditioning system according to claim 14, which is characterized in that the air-conditioning system further includes the operation of twin-tub increasing enthalpy Mode, when the air-conditioning system is in twin-tub increasing enthalpy operational mode, second control valve (13) is closed, the third control Valve (14) is opened, described to shift to an earlier date when first cylinder (11) compression cavity pressure is greater than prerelease device (116) back pressure First control valve of exhaust apparatus (116) is opened, until the first cylinder rotary (114) of first cylinder (11) turn over it is described Prerelease device (116), first control valve are just closed；In twin-tub increasing enthalpy operational mode: refrigerant is from the compression Become high-pressure sub-cooled liquid through the First Heat Exchanger (2) after machine (1) discharge, institute is entered after the first throttle element (4) State gas-liquid separator (5)；Refrigerant is divided into two-way in the gas-liquid separator (5), wherein all the way described in refrigerant liquid warp The outlet at bottom of gas-liquid separator (5), which enters second restricting element (6) throttling, to be become described in the entrance of low pressure two phase refrigerant Second heat exchanger (3), the evaporation in second heat exchanger (3) of low pressure two phase refrigerant become gaseous refrigerant by described first Air entry (111) sucking；Top of the another way refrigerant gas through the gas-liquid separator (5) in the gas-liquid separator (5) Portion outlet outflow, by second air entry after being mixed with the refrigerant being discharged from the prerelease device (116) (121) it sucks.

17. air-conditioning system according to claim 16, which is characterized in that when the air-conditioning system is in twin-tub increasing enthalpy mode When, the first cylinder (11) compression process are as follows: go to the first gas from the first cylinder rotary (114) of first cylinder (11) Cylinder slide plate (115) vertex position starts, before first cylinder rotary (114) turns over first air entry (111), compression Process does not start, and the first control valve of the prerelease device (116) is closed at this time；When first cylinder rotary (114) It goes to compression cavity pressure from air-breathing closed position to reach between position corresponding to intermediate pressure, first control valve closes It closes, and when first cylinder rotary (114) goes to compression cavity pressure and is greater than position corresponding to intermediate pressure, described the One control valve is opened, and prerelease process starts, at this time with the increase of the first cylinder rotary (114) corner, compression chamber Internal pressure power remains unchanged, and first control valve is still in opening state, when first cylinder rotary (114) turns over described mention When the prerelease mouth of front-seat device of air (116), prerelease process terminates, and compression chamber continues to compress, when compression cavity pressure When reaching the pressure at expulsion of the first row port (112), exhaust process starts, when first cylinder rotary (114) turns over When first row port (112), exhaust process terminates, and then completes entire circulation.

18. air-conditioning system according to claim 14, which is characterized in that the air-conditioning system further includes unloading operation mould Formula closes the aeration valve on the gas-liquid separator (5) when the air-conditioning system is in unloaded mode of operation, and described second Control valve (13) is closed, and the third control valve (14) is opened, and high temperature and high pressure gaseous refrigerant becomes through the First Heat Exchanger (2) For high pressure sub-cooled liquid refrigerant, then through the first throttle element (4) into the gas-liquid separator (5) to become middle compacting cold Agent, all refrigerants in the gas-liquid separator (5) become low pressure two phase refrigerant through second restricting element (6) throttling Into second heat exchanger (3), sucked after second heat exchanger (3) evaporation by first air entry (111)；Work as institute When stating the first cylinder (11) compression chamber back pressure greater than the second cylinder (12) pressure of inspiration(Pi), first control valve is opened, directly The first cylinder rotary (114) to first cylinder (11) turns over prerelease mouth, and the first control valve is closed.