WO2015172612A1

WO2015172612A1 - Air conditioning system

Info

Publication number: WO2015172612A1
Application number: PCT/CN2015/075906
Authority: WO
Inventors: 叶泽波; 王现林; 潘保远; 王耀
Original assignee: 珠海格力电器股份有限公司
Priority date: 2014-05-16
Filing date: 2015-04-03
Publication date: 2015-11-19
Also published as: CN103968460A

Abstract

Provided is an air conditioning system, comprising a compressor (110), a four-way reversing valve (120), an outdoor heat exchanger (130), a flash evaporator (150) and an indoor heat exchanger (170) all sequentially communicating with each other; the first port of the flash evaporator (150) communicates with the first port of the outdoor heat exchanger (130); the second port of the flash evaporator (150) communicates with an air supply port (112) of the compressor (110); an air compensating valve (180) is disposed between the second port of the flash evaporator (150) and the air supply port (112) of the compressor (110); the third port of the flash evaporator (150) communicates with the first port of the indoor heat exchanger (170); the compressor (110) is provided with a first air intake port (114) and a second air intake port (115) thereon; the first air intake port (114) and the second air intake port (115) communicate with the four-way reversing valve (120); and an intake valve (113) is disposed between the first air intake port (114) and the four-way reversing valve (120). The air conditioning system employs double-cylinder variable capacity technology plus two-stage compressed air-supplying enthalpy-adding technology, realizes single/double cylinder operating modes switching via the opening-closing of the intake valve (113), and controls the amount of supply air via opening-closing of the air compensating valve (180), thus improving energy efficiency when a low-frequency low-load single cylinder operates, and improving capability when a high-frequency high-load double-cylinder operates.

Description

Air Conditioning System

Technical field

The present invention relates to the field of air conditioning, and in particular to an air conditioning system.

Background technique

The prior art discloses a two-cylinder variable capacity compressor air-conditioning system, which realizes two-cylinder/single-cylinder switching by turning on and off the three-way reversing valve to realize the two-cylinder/single-cylinder switching, thereby changing the compressor capacity. However, the system uses a single-cylinder mode for conventional cooling and heating. Only when the load is high, the small cylinder is opened, and the maximum capacity can only be increased by about 20%; and at low load, there is no advantage compared with the ordinary compression system.

The prior art also discloses a double-stage compressor air-conditioning system for supplementing gas and increasing enthalpy. The system adjusts the intermediate pressure through the on-off and power-off of the gas-filled electromagnetic valve and the electronic expansion valve to realize the on-off and the supplement of the air supply. , thereby increasing the heat production, especially at low temperatures. However, the system still works when the system is under low load and the energy efficiency is not high.

Summary of the invention

The object of the present invention is to provide an air conditioning system to solve the technical problem of low operating efficiency of a two-cylinder compressor.

To achieve the above object, the present invention provides an air conditioning system comprising: a compressor, a four-way reversing valve, an outdoor heat exchanger, a flasher, and an indoor heat exchanger that are sequentially connected; the first interface and the outdoor exchange of the flasher The first interface of the heat exchanger is connected, the second interface of the flasher is connected with the air inlet of the compressor, and the air inlet valve is arranged between the second interface of the flasher and the air inlet of the compressor; the third interface of the flasher The first interface of the indoor heat exchanger is connected; the compressor is provided with a first air inlet and a second air inlet, and the first air inlet and the second air inlet are connected with the four-way switching valve; An intake valve is provided between the suction port and the four-way reversing valve.

Further, a primary throttling element is disposed between the first interface of the flasher and the first interface of the outdoor heat exchanger.

Further, a secondary throttling element is disposed between the third interface of the flasher and the first interface of the indoor heat exchanger.

Further, the first interface and the third interface of the flasher are connected to each other through a built-in heat exchange tube.

Further, the fourth interface of the flasher is an inlet, and the fourth interface of the flasher is provided with a supplemental throttle element.

Further, the air conditioning system further includes a first one-way valve disposed in parallel with the first-stage throttle element, the inlet end of the first one-way valve is in communication with the first interface of the outdoor heat exchanger, and the outlet end of the first one-way valve It is in communication with the first interface of the flasher.

Further, the air conditioning system further includes a second one-way valve disposed in parallel with the secondary throttle element, the inlet of the second one-way valve is in communication with the first interface of the indoor heat exchanger, and the outlet of the second one-way valve is flashed The second interface of the steamer is in communication.

Further, a third check valve is disposed between the first interface of the outdoor heat exchanger and the supplemental throttle element, and the inlet of the third check valve is in communication with the first interface of the outdoor heat exchanger, and the third check valve The outlet is connected to the plenum throttle element.

Further, a fourth check valve is disposed between the first interface of the indoor heat exchanger and the supplemental throttle element, and the inlet of the fourth check valve is in communication with the first interface of the indoor heat exchanger, and the fourth check valve The outlet is connected to the plenum throttle element.

Further, a reservoir is disposed between the first intake port and the second intake port and the four-way reversing valve.

The invention has the following beneficial effects:

When the air conditioner is running at low load, the single-cylinder low-frequency operation can stably maintain the room temperature, and it is economical and energy-saving. When the air conditioner is in normal operation and high-load operation, the two-cylinder two-stage compression and air supply increase and increase the cooling and heating capacity, so that the room can quickly reach the set temperature. Air-conditioning defrosting and special working conditions, double-cylinder two-stage compression, no venting, speeding up defrosting, compressor work is more reliable; the invention adopts two-cylinder variable capacity technology + two-stage compression qi and enthalpy technology The on/off of the intake valve realizes the switching of the single/double cylinder operation mode, and the control of the air supply amount is realized by the on/off of the air supply valve. In low-frequency and low-load, single-cylinder operation, energy efficiency improvement; high-frequency high-load operation, dual-cylinder operation, capacity improvement.

In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The invention will now be described in further detail with reference to the drawings.

DRAWINGS

The accompanying drawings, which are incorporated in the claims In the drawing:

Figure 1 is a schematic view of a first embodiment of an air conditioning system in accordance with the present invention;

2 is a schematic view of a corresponding two-cylinder two-stage compression compression of the first embodiment of the air conditioning system according to the present invention;

Figure 3 is a schematic view of a corresponding single cylinder single stage compression compaction of a first embodiment of an air conditioning system in accordance with the present invention;

Figure 4 is a schematic illustration of a second embodiment of an air conditioning system in accordance with the present invention;

Figure 5 is a schematic illustration of a third embodiment of an air conditioning system in accordance with the present invention;

Figure 6 is a schematic view of a second embodiment and a third embodiment of the air conditioning system according to the present invention.

The reference numerals in the drawings are as follows: 110, compressor; 120, four-way reversing valve; 130, outdoor heat exchanger; 140, primary throttling element; 150, flasher; 160, two-stage throttling element; 170, indoor heat exchanger; 180, air supply valve; 190, air supply throttle element; 111, liquid reservoir; 112, air supply port; 113, suction valve; 114, first suction port; 115, second suction Air port; 141, first check valve; 161, second check valve; 191, third check valve; 192, fourth check valve.

detailed description

The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 to FIG. 6, an air conditioning system according to the present invention includes: a compressor 110, a four-way switching valve 120, an outdoor heat exchanger 130, a flasher 150, and an indoor heat exchanger 170 that are sequentially connected; The first interface of the flasher 150 is in communication with the first interface of the outdoor heat exchanger 130, the second interface of the flasher 150 is in communication with the air inlet 112 of the compressor 110, and the second interface of the flasher 150 is coupled to the compressor 110 An air supply valve 180 is disposed between the air supply ports 112; a third interface of the flasher 150 is in communication with the first interface of the indoor heat exchanger 170; the compressor 110 is provided with a first air inlet 114 and a second air inlet 115, the first air inlet 114 and the second air inlet 115 are in communication with the four-way switching valve 120; an intake valve 113 is disposed between the first air inlet 114 and the four-way switching valve 120. A reservoir 111 is disposed between the first intake port 114 and the second intake port 115 and the four-way switching valve 120. When the air conditioner is running at low load, the single-cylinder low-frequency operation can stably maintain the room temperature, and it is economical and energy-saving. When the air conditioner is in normal operation and high-load operation, the two-cylinder two-stage compression and air supply increase and increase the cooling and heating capacity, so that the room can quickly reach the set temperature. Air-conditioning defrosting and special working conditions, double-cylinder two-stage compression, no venting, speeding up defrosting, compressor work is more reliable; the invention adopts two-cylinder variable capacity technology + two-stage compression qi and enthalpy technology The on/off of the intake valve realizes the switching of the single/double cylinder operation mode, and the control of the air supply amount is realized by the on/off of the air supply valve. In low-frequency and low-load, single-cylinder operation, energy efficiency improvement; high-frequency high-load operation, dual-cylinder operation, capacity improvement.

Referring to Figures 4 and 5, a primary throttling element 140 is disposed between the first interface of the flasher 150 and the first interface of the outdoor heat exchanger 130. The third interface of the flasher 150 is disposed between the first interface of the indoor heat exchanger 170 There is a secondary throttling element 160. The first interface and the third interface of the flasher 150 are in communication with each other through a built-in heat exchange tube. The fourth interface of the flasher 150 is an inlet, and the fourth interface of the flasher 150 is provided with a supplemental throttle element 190.

The air conditioning system further includes a first one-way valve 141 disposed in parallel with the primary throttling element 140, the inlet end of the first one-way valve 141 being in communication with the first interface of the outdoor heat exchanger 130, the first one-way valve 141 The outlet end is in communication with the first interface of the flasher 150. The air conditioning system further includes a second one-way valve 161 disposed in parallel with the secondary throttle element 160, the inlet of the second one-way valve 161 being in communication with the first interface of the indoor heat exchanger 170, and the outlet of the second one-way valve 161 It is in communication with the second interface of the flasher 150. A third check valve 191 is disposed between the first interface of the outdoor heat exchanger 130 and the supplemental throttle element 190. The inlet of the third check valve 191 is in communication with the first interface of the outdoor heat exchanger 130. The outlet to the valve 191 is in communication with the supplemental throttle element 190. A fourth check valve 192 is disposed between the first port of the indoor heat exchanger 170 and the supplemental throttle element 190. The inlet of the fourth check valve 192 is in communication with the first interface of the indoor heat exchanger 170. The outlet to the valve 192 is in communication with the supplemental throttle element 190.

The present invention provides several variable capacity two stage boosting compression systems having a compressor 110 with an intake valve 113 having two cylinders above and below. The inhalation valve 113 includes, but is not limited to, a solenoid valve, an electric valve, an electronic expansion valve, etc., and the position includes, but is not limited to, between the accumulator and the compressor cylinder, inside the compressor cylinder, between the cylinders, or separately placed in the compressor external. The compressor 110 includes, but is not limited to, a rotor compressor, a piston compressor, a scroll compressor, a screw compressor, and a centrifugal compressor. The lower cylinder of the compressor has a controllable position of the sliding piece, which is connected with the pin, and through the opening and closing of the suction valve 113, the two states of pressing and bypassing are realized. The slider control mechanism includes, but is not limited to, a pin, a connecting rod, an electromagnetic attraction, a differential pressure pushing, and the like. When the intake valve 113 is in the open state, the refrigerant can enter the upper cylinder of the compressor for compression from the first intake port 114, and the lower cylinder slide is disengaged, and the lower cylinder is in an inoperative state, achieving single-stage single-stage compression. When the intake valve 113 is closed, the refrigerant can only enter the compressor from the second intake port 115, while the lower cylinder slide is in the working position, the lower cylinder operates normally, and the refrigerant is compressed by the lower cylinder and then enters the upper cylinder and compressed again. Discharge, achieve two-stage two-stage compression. The working sequence of the upper and lower cylinders includes but is not limited to first, then, and up and down. The compressor is switched between the on/off mode of the intake valve 113 to switch the single/double cylinder operation mode, and the capacity is variable. The system using the compressor has the following embodiments, including but not limited to the embodiments described below.

According to a first embodiment of the present invention, FIG. 1 is a schematic diagram of a system of the present embodiment, FIG. 2 is a two-cylinder two-stage compression compression diagram of the present embodiment, and FIG. 3 is a single-cylinder single-stage compression compression diagram of the present embodiment. . The system of the embodiment mainly consists of a compressor 110, a four-way reversing valve 120, an outdoor heat exchanger 130, a primary throttling element 140, a flasher 150, a secondary throttling element 160, an indoor heat exchanger 170, and an air supply valve. 180 and so on. The primary throttling element 140 and the secondary throttling element 160 include, but are not limited to, a capillary tube, an electronic expansion valve, a thermal expansion valve, and the like.

In the cooling main circulation of the present embodiment, the high-temperature and high-pressure gaseous refrigerant b compressed and discharged through the compressor 110 flows through the four-way switching valve 120 and enters the outdoor heat exchanger 130 to be condensed into a high-pressure low-temperature liquid refrigerant c, and passes through the first-stage throttling element. The 140 throttling becomes medium-pressure low-temperature two-phase refrigerant d enters the flasher 150 and flashes into a saturated gaseous refrigerant g and a saturated liquid refrigerant e. The saturated gaseous refrigerant g enters the air supply port 112 through the air supply valve 180 to perform air enrichment, and the saturated liquid refrigerant e is throttled by the secondary throttling element 160 to become a low pressure low temperature refrigerant f to enter the indoor heat exchanger to evaporate into a low pressure low temperature gaseous refrigerant. a, after passing through the four-way reversing valve 120, the accumulator 111 is sucked and compressed by the compressor to complete the system cycle. The heating cycle four-way reversing valve 120 is reversing, and the various valves are opened and closed in the same state as the refrigerating cycle.

This embodiment can be further divided into three working modes:

(In the case of refrigeration, the heating valve is opened and closed with the same cooling)

1. Double-cylinder two-stage air supply and boost mode: the compressor intake valve 113 is closed, and the air supply valve 180 is opened. The refrigerant enters the second intake port 115 from the accumulator 111, and the refrigerant b' compressed by the lower cylinder of the compressor is mixed with the gaseous refrigerant g flashed by the flasher 150 to be a', and then sucked into the upper cylinder for second-stage compression. The cycle is as described above, and the pressure map is shown in Figure 2.

2. Single-cylinder single-stage compression mode: the compressor suction valve 113 is opened, and the air supply valve 180 is closed. The refrigerant flashed by the flasher 150 does not enter the air supply port 112 for air supply, and the refrigerant a enters the first intake port 114 from the accumulator 111 through the compressor intake valve 113, is compressed by the upper cylinder, and is discharged to the compressor. After the suction valve 113 is opened, the lower cylinder slide control device pulls the slide plate out of the cylinder, and the lower cylinder idles without compression work, achieving single-stage single-stage compression, and the pressure collapse diagram is shown in Fig. 3.

3. The two-cylinder two-stage non-opening air supply and increasing mode: the compressor suction valve 113 is closed, and the air supply valve 180 is closed. The refrigerant a passes through the second suction port 115 and enters the lower cylinder for compression, and then directly enters the upper cylinder for second-stage compression and is discharged.

According to a second embodiment of the present invention, FIG. 4 is a schematic diagram of the system of the present embodiment, and FIG. 6 is a pressure diagram of the embodiment.

As shown in FIG. 4, the embodiment mainly includes a compressor 110, a four-way switching valve 120, an outdoor heat exchanger 130, a primary throttle element 140, a flasher 150, a secondary throttle element 160, an indoor heat exchanger 170, The air supply throttle element 190, the first check valve 141, the second check valve 161, the third check valve 191, the fourth check valve 192, and the like. The primary throttling element 140 and the secondary throttling element 160 include, but are not limited to, a capillary tube, an electronic expansion valve, a thermal expansion valve, and the like. The supplemental throttle element 190 includes, but is not limited to, a capillary tube, a capillary tube + a solenoid valve, an electronic expansion valve, a thermal expansion valve, etc., preferably an electronic expansion valve.

In the cooling main cycle of the present embodiment, the high-temperature high-pressure refrigerant b compressed and discharged through the compressor 110 enters the outdoor heat exchanger 130 through the four-way switching valve 120 to be condensed into a high-pressure low-temperature refrigerant c, and enters the flasher from the first one-way valve 141. The heat exchange tube in 150 is re-cooled to e, and after entering the indoor heat exchanger after being throttled by the secondary throttle element 160 170 evaporates to a, and again passes through the four-way reversing valve 120 to return to the compressor to complete the main refrigeration cycle. One channel of refrigerant is taken out from the outlet of the outdoor heat exchanger 130 through the third check valve 191 and throttled by the supplemental gas throttle element 190, and then enters the flasher 150 to evaporate, absorbs the heat of the main circulating refrigerant in the heat exchange tube, and then enters the compression through the air inlet port 112. Machine, complete the gas supplement and circulation cycle.

The heating main circulation four-way reversing valve 120 is reversing, and all kinds of valves are in the same state of refrigeration. The refrigerant discharged from the compressor through the four-way switching valve 120 into the indoor heat exchanger 170 passes through the second one-way valve 161 and enters the flasher 150, and is throttled by the primary throttling element 140 into the outdoor heat exchanger 130 to evaporate. Go back to the compressor. The air-enhanced and auxiliary branch refrigerant is throttled from the indoor heat exchanger 170 through the fourth check valve 192 to the supplemental throttle element 190, and then enters the air inlet port 112 to complete the heating and air-enhancing cycle.

In this embodiment, the first check valve 141, the second check valve 161, the third check valve 191, and the fourth check valve 192 include, but are not limited to, a single valve, a solenoid valve, an electric valve, etc., having an on-off function or controlling a refrigerant. The components of the flow direction, the third check valve 191, and the fourth check valve 192 are not included but are not limited to being placed in front of or behind the first check valve 141 and the second check valve 161.

This embodiment can also be divided into three modes:

1. Double-cylinder two-stage air supply and boost mode: the compressor intake valve 113 is closed, and the air supply throttle element 190 is opened. The refrigerant enters the second intake port 115 from the accumulator 111, and the refrigerant b' compressed by the lower cylinder of the compressor is mixed with the gaseous refrigerant g flashed by the flasher 150 to be a', and then sucked into the upper cylinder for second-stage compression. The cycle is as described above, and the pressure map is as shown in Fig. 6.

2. Single-cylinder single-stage compression mode: the compressor intake valve 113 is opened, and the supplemental throttle element 190 is closed. The refrigerant flashed by the flasher 150 does not enter the air supply port 112 for air supply, and the refrigerant a enters the first intake port 114 from the accumulator 111 through the compressor intake valve 113, is compressed by the upper cylinder, and is discharged to the compressor. After the inhalation valve 113 is opened, the lower cylinder slide control device pulls the slide plate out of the cylinder, and the lower cylinder does not perform the compression work, thereby achieving single-stage single-stage compression, and the pressure collapse diagram is as shown in FIG.

3. The two-cylinder two-stage non-opening air supply increasing mode: the compressor suction valve 113 is closed, and the air supply throttle element 190 is closed. The refrigerant a passes through the second suction port 115 and enters the lower cylinder for compression, and then directly enters the upper cylinder for second-stage compression and is discharged.

Embodiment 3:

This embodiment is a simplified manner of the second embodiment, and the first check valve 141, the second check valve 161, the third check valve 191, the fourth check valve 192, and the primary throttle element 140 of the second embodiment are eliminated. . This embodiment can only unidirectional qi If you increase the enthalpy, you can only replenish the air or heat the air. In the system diagram, only the indoor heat exchanger 170 and the outdoor heat exchanger 130 can be replaced.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

When the air conditioner is running at low load, the single-cylinder low-frequency operation can stably maintain the room temperature, and it is economical and energy-saving. When the air conditioner is in normal operation and high-load operation, the two-cylinder two-stage compression and air supply increase and increase the cooling and heating capacity, so that the room can quickly reach the set temperature. Air-conditioning defrosting and special working conditions, double-cylinder two-stage compression, no venting, speeding up defrosting, compressor work is more reliable; the invention adopts two-cylinder variable capacity technology + two-stage compression qi and enthalpy technology The on/off of the intake valve realizes the switching of the single/double cylinder operation mode, and the control of the air supply amount is realized by the on/off of the air supply valve and the adjustment of the electronic expansion valve. In low-frequency and low-load, single-cylinder operation, energy efficiency improvement; high-frequency high-load operation, dual-cylinder operation, capacity improvement.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

An air conditioning system, comprising: a compressor (110), a four-way reversing valve (120), an outdoor heat exchanger (130), a flasher (150), and an indoor heat exchanger (170) that are sequentially connected ;

a first interface of the flasher (150) is in communication with a first interface of the outdoor heat exchanger (130), a second interface of the flasher (150) and an air inlet of the compressor (110) (112) communicating, an air supply valve (180) is disposed between the second interface of the flasher (150) and the air inlet (112) of the compressor (110); the flasher (150) The third interface is in communication with the first interface of the indoor heat exchanger (170);

The compressor (110) is provided with a first air inlet (114) and a second air inlet (115), and the first air inlet (114) and the second air inlet (115) are The four-way reversing valve (120) is in communication;

An intake valve (113) is disposed between the first intake port (114) and the four-way selector valve (120).
The air conditioning system according to claim 1, wherein a first throttle element (140) is disposed between the first interface of the flasher (150) and the first interface of the outdoor heat exchanger (130) .
The air conditioning system according to claim 1, wherein a secondary throttle element (160) is disposed between the third interface of the flasher (150) and the first interface of the indoor heat exchanger (170) ).
The air conditioning system according to claim 1, wherein the first interface and the third interface of the flasher (150) are in communication with each other through a built-in heat exchange tube.
The air conditioning system according to any one of claims 1 to 4, characterized in that the fourth interface of the flasher (150) is an inlet, and the fourth interface of the flasher (150) is provided with an air supply section. Flow element (190).
The air conditioning system according to claim 2, further comprising a first one-way valve (141) disposed in parallel with said primary throttling element (140), said first one-way valve (141) The inlet end is in communication with a first interface of the outdoor heat exchanger (130), and an outlet end of the first one-way valve (141) is in communication with a first interface of the flasher (150).
The air conditioning system according to claim 3, further comprising a second one-way valve (161) disposed in parallel with the secondary throttle element (160), the second one-way valve (161) An inlet is in communication with a first interface of the indoor heat exchanger (170), and an outlet of the second one-way valve (161) is in communication with a second interface of the flasher (150).
The air conditioning system according to claim 5, wherein a third check valve (191) is disposed between the first interface of the outdoor heat exchanger (130) and the supplemental throttle element (190), An inlet of the third one-way valve (191) is in communication with a first interface of the outdoor heat exchanger (130), an outlet of the third one-way valve (191) and the supplemental throttle element (190) ) connected.
The air conditioning system according to claim 8, wherein a fourth check valve (192) is disposed between the first interface of the indoor heat exchanger (170) and the supplemental throttle element (190), An inlet of the fourth one-way valve (192) is in communication with a first interface of the indoor heat exchanger (170), an outlet of the fourth one-way valve (192) and the supplemental throttle element (190) ) connected.
The air conditioning system according to claim 1, wherein between the first intake port (114) and the second intake port (115) and the four-way selector valve (120) Reservoir (111).