WO2013177872A1

WO2013177872A1 - Air conditioning system

Info

Publication number: WO2013177872A1
Application number: PCT/CN2012/081225
Authority: WO
Inventors: 张卫星; 陈杰
Original assignee: 艾默生网络能源有限公司
Priority date: 2012-05-31
Filing date: 2012-09-11
Publication date: 2013-12-05
Also published as: CN103453705B; CN103453705A

Abstract

An air conditioning system comprises a first liquid storage tank (5), a compressor (1), a condensation device (2), a first flow control valve (3), a first on/off valve (41), an evaporator (8), and a switching device (6). A first input end (I_c1) of the compressor (1) is connected to a second output end (Ο_t2) of the first liquid storage tank (5), and an output end (O_c) of the compressor (1) is connected to an input end of a first condensation portion (2a) of the condensation device (2). An output end of the first condensation portion (2a) is connected to a first input end (I_t1) of the first liquid storage tank (5) through the first flow control valve (3). A first output end (O_tl) of the first liquid storage tank (5) is connected to an input end of the evaporator (8). An output end of the evaporator (8) is connected to a second input end (I_t2) of the first liquid storage tank (5) through a first path of the switching device (6), and the output end of the evaporator (8) is connected to an input end of a second condensation portion (2b) of the condensation device (2) through a second path of the switching device (6). An output end of the second condensation portion (2b) is connected to the first input end (I_t1) of the first liquid storage tank (5) through the first on/off valve (41). The switching device (6) is configured to be capable of working as: opening the first path and closing the second path, closing the first path and opening the second path, and opening both the first path and the second path. The air conditioning system implements running of a compressor mode and a natural cold source refrigeration mode at the same time.

Description

AIR CONDITIONING SYSTEM This application claims priority to Chinese Patent Application No. 20121017977, filed on May 31, 2012, the entire disclosure of which is hereby incorporated by reference. Technical field

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

For energy saving reasons, technologies that utilize natural cold sources for cooling can be employed in air conditioning systems such as those used in machine rooms. That is, the air conditioning system is built such that it can condense the refrigerant with a low ambient temperature in a season where the outdoor ambient temperature is low, thereby saving a large amount of power, thereby reducing the production cost. Summary of the invention

However, in some cases, an air conditioning system that uses a natural cold source for refrigeration alone does not provide a satisfactory cooling effect, and its use is subject to seasonal variations.

In view of the above, an object of the present invention is to provide an air conditioning system capable of switching between natural cold source refrigeration, compressor refrigeration, and simultaneous cooling using a natural cold source and a compressor as needed.

According to an embodiment of the present invention, an air conditioning system is provided, including: a first liquid storage tank, a compressor, a condensing device, a first flow control valve, a first on-off valve, an evaporator, and a switching device; wherein, the compressor The first input end is connected to the second output end of the first liquid storage tank, the output end of the compressor is connected to the input end of the first condensation portion of the condensation device, and the output end of the first condensation portion is connected to the first flow control valve via the first flow control valve a first input end of the liquid storage tank, the first output end of the first liquid storage tank is connected to the input end of the evaporator; the output end of the evaporator is connected to the second input end of the first liquid storage tank through the first passage of the switching device, And the output end of the evaporator is connected to the input end of the second condensing portion of the condensing device through the second passage of the switching device; the output end of the second condensing portion is connected to the first input end of the first liquid storage tank via the first on-off valve; And the switching device is configured to be operable in three ways: the first passage is open and the second passage is closed A first mode, a second mode in which the first passage is closed and the second passage is open, and a third manner in which both the first passage and the second passage are open.

According to another embodiment of the present invention, the air conditioning system further includes a second on-off valve and a third on-off valve, wherein the first end of the second on-off valve is disposed at an output end of the compressor and the first condensation portion Between the input ends, and the second end of the second on-off valve is disposed between the outlet of the second passage of the switching device and the input end of the second condensing portion; the first end of the third on-off valve is disposed at the first condensation A portion of the output end is coupled to the input end of the first flow control valve, and a second end of the third on-off valve is disposed between the output end of the second condensing portion and the input end of the first on-off valve.

According to another embodiment of the present invention, the switching device is configured to be capable of adjusting the opening of the first passage and the second passage when operating in the third mode, thereby controlling the flux of the refrigerant passing through the first and second passages .

According to another embodiment of the present invention, the switching device is a switching valve; or the switching device includes a fourth on-off valve disposed between the evaporator output end and the second input end of the first liquid storage tank, and is disposed at the evaporation A fifth on-off valve or check valve between the output of the device and the input of the second condensing portion.

According to another embodiment of the invention, the outputs of the evaporator are grouped, a portion of the packet is connected to the second input of the first reservoir via a fourth on-off valve, and another portion of the packet is passed through A five-way shut-off valve is coupled to the input of the second condensing portion; and a sixth on-off valve is provided between a portion of the group and the other portion to control the on-off between the groups.

According to another embodiment of the invention, the switching device comprises at least two switching valves, the outputs of which are grouped and connected to the second input and the second condensing portion of the first liquid storage tank via respective switching valves Input.

In accordance with another embodiment of the present invention, the air conditioning system further includes a seventh on-off valve disposed between the output of the first on-off valve and the first output of the first reservoir.

According to another embodiment of the present invention, there is a positive drop in height between the first output end of the first liquid storage tank and the input end of the evaporator; the first output end of the first liquid storage tank is connected to the evaporator via the power device Or the first output end of the first liquid storage tank and the input end of the evaporator have a positive drop in height, and the first output end of the first liquid storage tank is connected to each other via a power device and a An eight-way shut-off valve is connected to the input of the evaporator.

According to another embodiment of the present invention, when the compressor is an oil compressor, the first liquid storage tank The third output is connected to the first input end of the compressor, and there is a positive drop in height between the third output end of the first liquid storage tank and the first input end of the compressor; or, the third of the first liquid storage tank The output is connected to the first input of the ejector pump, and the first output of the ejector pump is connected to the first input of the compressor.

According to another embodiment of the invention, when the air conditioning system includes an ejector pump, the second input of the ejector pump is coupled between the output of the compressor and the input of the first flow control valve.

According to another embodiment of the present invention, the air conditioning system further includes an oil separator, wherein an output end of the compressor is connected to an input end of the oil separator, and a first output end of the oil separator is connected to an input end of the first condensing portion, A second output of the oil separator is coupled to the second input of the compressor.

According to another embodiment of the present invention, the air conditioning system further includes: a second liquid storage tank for assisting storage of the refrigerant in the air conditioning system; wherein the second liquid storage tank is connected to the output end of the first condensation portion and Between the inputs of a flow control valve.

According to another embodiment of the present invention, the air conditioning system further includes: a bypass line, the first end of the bypass line being disposed between the output end of the first condensing portion and the input end of the second liquid storage tank, and A second end of the bypass line is disposed between the output of the second reservoir and the input of the first flow control valve.

According to another embodiment of the present invention, the air conditioning system further includes a first level controller for controlling the liquid level in the first reservoir to start or stop the power unit.

According to another embodiment of the present invention, the air conditioning system further includes: a second liquid level controller for controlling the opening degree of the first flow control valve according to the detected liquid level in the first liquid storage tank.

According to another embodiment of the present invention, the air conditioning system further includes: a third liquid level controller, configured to control start or stop of the power device according to the detected liquid level in the first liquid storage tank, and The opening of a flow control valve is controlled.

According to another embodiment of the present invention, the output end of the first passage of the switching device is connected to the second input end of the first liquid storage tank via the first one-way valve; and/or the output end of the second passage of the switching device is via The second one-way valve is coupled to the input of the second condensing portion; and/or the output of the compressor is coupled to the input of the first condensing portion via a third one-way valve.

According to another embodiment of the present invention, an air conditioning system includes a plurality of compressors connected in parallel with each other. According to another embodiment of the present invention, a flow control valve is provided at an input end of each evaporator connected in parallel to the first output end of the first liquid storage tank, thereby controlling the refrigerant supplied to each of the evaporators the amount. According to another embodiment of the invention, the form of connection between the evaporators is in parallel, in series, or a combination of parallel and series.

According to another embodiment of the invention, the air conditioning system is an air cooled screw air conditioning system, a water cooled screw air conditioning system, an air cooled scroll air conditioning system or a water cooled scroll air conditioning system.

The air conditioning system according to the embodiment of the present invention makes full use of the natural cold source for cooling when the ambient temperature permits, reducing the power consumption of the system. Moreover, when the cooling requirements are relatively high, the compressor is activated at the right time, so that the air conditioning system can always meet the cooling needs. DRAWINGS

The drawings are intended to provide a further understanding of the invention, and are intended to be a part of the description of the invention. In the drawings: Fig. 1 is a schematic view showing the configuration of an air conditioning system according to a first embodiment of the present invention; Fig. 2 is a schematic view showing the configuration of an air conditioning system according to a second embodiment of the present invention; 4 is a schematic view showing the structure of an air conditioning system according to a third embodiment of the present invention; FIG. 4 is a schematic view showing the configuration of an air conditioning system according to a fourth embodiment of the present invention; and FIG. 5 is a view showing an air conditioning system according to a fifth embodiment of the present invention. FIG. 6 is a schematic view showing the configuration of an air conditioning system according to a sixth embodiment of the present invention; FIG. 7 is a schematic view showing the configuration of an air conditioning system according to a seventh embodiment of the present invention; Fig. 9 is a schematic view showing the configuration of an air conditioning system according to a ninth embodiment of the present invention; Fig. 10 is a view showing an air conditioning system according to a tenth embodiment of the present invention; FIG. 11 is a schematic view showing the configuration of an air conditioning system according to an eleventh embodiment of the present invention; FIG. 12 is a view showing an air conditioning system according to a twelfth embodiment of the present invention. FIG. 13 is a schematic view showing the configuration of an air conditioning system according to a thirteenth embodiment of the present invention; FIG. 14 is a schematic view showing the configuration of an air conditioning system according to a fourteenth embodiment of the present invention; BRIEF DESCRIPTION OF THE DRAWINGS FIG. 16 is a schematic view showing the configuration of an air conditioning system according to a sixteenth embodiment of the present invention. detailed description

The preferred embodiments of the present invention are described in the following with reference to the accompanying drawings, and the preferred embodiments of the present invention are intended to illustrate and explain the invention.

Embodiments of the present invention will now be described with reference to the accompanying drawings. It should be noted that, for the sake of clarity, representations and descriptions of components and processes known to those skilled in the art that are not relevant to the present invention are omitted from the drawings and the description.

The air conditioning system according to the present invention follows the idea of designing a switching device that can switch between several paths or can simultaneously open several paths and adjust the opening degree for each path, and can be separated or combined by its on-off separation or combination Several on-off valves in various parts of the equipment enable the air conditioning system to form two separate refrigerant circulation paths as needed. And these two paths can run simultaneously in different cooling modes.

Fig. 1 is a schematic view showing the configuration of an air conditioning system according to a first embodiment of the present invention. The air conditioning system comprises: a liquid storage tank 5 (as an example of a "first liquid storage tank"), a compressor 1, a condensing device 2, a flow control valve 3 (as an example of a "first flow control valve"), a shut-off valve 41 (as an example of "first on-off valve"), evaporator 8 and switching device 6. Wherein the input I _{cl of the} compressor 1 (as an example of the "first input of the compressor") is connected to the output O _{t2 of the} reservoir 5 (as an example of the "second output of the first reservoir"" ) to receive the refrigerant gas from the liquid storage tank 5; the output end O _{c is} connected to the input end of the condensing portion 2a of the condensing device 2 (as an example of the "first condensing portion"), and the compressed high-pressure refrigerant gas is delivered Condensation is carried out into the condensing portion 2a. The output end of the condensing portion 2a is connected to the input end _{110 of the} liquid storage tank 5 via the flow control valve 3 (as an example of "the first input end of the first liquid storage tank") to flow the condensed refrigerant liquid through the flow control The valve 3 is stored in the liquid storage tank 5 after being throttled. The output O _{tl of the} reservoir 5 (as an example of "the first output of the first reservoir" is connected to the input of the evaporator 8). The refrigerant that has been throttled by the flow control valve 3 is gas-liquid mixed, and these refrigerants are gas-liquid separated in the liquid storage tank 5, and the liquid enters the evaporator 8, and the gas enters the compressor 1. The evaporator 8 is cooled by evaporation of the refrigerant liquid. The output of the evaporator 8 of the first passage 6 is connected to the input terminal I _t2 reservoir tank 5 (as "a second input of the first reservoir," the example) by the switching means, and an evaporator through an output terminal 8 The second passage of the switching device 6 is connected to the input of the condensing portion 2b of the condensing device 2 (as an example of the "second condensing portion"). The output of the condensing portion 2b is connected to the input terminal I _{tl of the} reservoir 5 via the on-off valve 41. And the switching device 6 is configured to be able to The three modes operate: a first mode in which the first passage is open and the second passage is closed, a second manner in which the first passage is closed and the second passage is open, and a third manner in which both the first passage and the second passage are open.

The switching device 6 according to an embodiment of the present invention can switch between its first path and the second path. , The output terminal 8 as shown in FIG evaporator 1 can input terminal I _t2 reservoir 5 is connected via a first path switching device 6. In addition, the output of the evaporator 8 can be connected to the input of the condensing portion 2b of the condensing device 2 via the second passage of the switching device 6. That is, the refrigerant vapor outputted from the evaporator 8 is directly sent to the condensing device 2. The direction of the arrows in the figures is intended to indicate the direction of circulation of the refrigerant in the air conditioning system. The following figures are not labeled one by one for the sake of brevity.

Here, the "switching means" is a collective term for a device or a device group for switching the transmission path of the refrigerant vapor output from the evaporator 8, and is not limited to a specific implementation. For example, the switching device 6 can be a switching valve. Then, the first passage of the switching device 6 refers to a passage between the input end of the switching valve and the input end of the switching valve, and the second passage of the switching device 6 refers to the inside of the switching valve, the input end of the switching valve is different from A path between the second output of the first output. As an example, as shown in Figure 1, the input of the switching valve 6 is connected to the output of the evaporator 8, and the output of the switching valve 6, _Ols (as an example of the "first output of the switching valve"), is connected to the reservoir. The input terminal I _{t2 of} 5, the output O _{s2 of the} switching valve 6 (as an example of the "second output of the switching valve") is connected to the input of the condensing portion 2b of the condensing device 2. The main function of the switching valve of the switching device 6 is to realize the switching of the flow path, and it can be realized by a four-way valve, a three-way valve, a solenoid valve, or the like, but is not limited thereto. In addition, the switching transposition 6 can also be implemented using discrete components such as on-off valves, etc., which will be described in detail later.

As can be seen from the above description, the air conditioning system according to the embodiment of the present invention is configured by configuring the condensing device to be separately used for compressor refrigeration (condensing portion 2a) and for independent operation of natural cold source cooling (condensing portion 2b). It can be operated in compressor cooling mode or natural cold source cooling mode alone or in two cooling modes.

When the air conditioning system is operating in the compressor cooling mode, the compressor 1 is operated, the on-off valve 41 is closed, and the switching device 6 is switched to the first passage. At this time, the condensing portion 2a of the condensing device 2 performs a condensation process. When the air conditioning system is operating in the natural cold source cooling mode, the compressor 1 is stopped, the on-off valve 41 is opened, and the switching device 6 is switched to the second passage. At this time, the condensing portion 2b of the condensing device 2 performs a condensation process. When the air conditioning system simultaneously runs the two modes of compressor cooling and natural cold source cooling, the on-off valve 41 is opened, and the first passage and the second passage of the switching device 6 are both opened, so that part of the refrigerant flows to the liquid storage tank 5, and A part flows directly to the condensing portion 2b. At this time, the condensing portion 2a of the condensing device 2 condenses the refrigerant gas supplied from the compressor, and the condensing portion 2b of the condensing device 2 condenses the refrigerant vapor directly from the evaporator 8.

In other words, when the switching device 6 is operated in the first mode in which the first passage is opened and the second passage is closed, the compressor 1 operates to condense the high-pressure refrigerant gas using the condensing portion 2a; when the switching device 6 is first When the second mode in which the passage is closed and the second passage is opened, the compressor 1 is stopped, the refrigerant vapor is directly sent from the evaporator 8 to the condensing portion 2b of the condensing device 2, and the refrigerant is condensed by the natural cold source; When the apparatus 6 is operated in the third mode in which both the first passage and the second passage are opened, the air conditioning system operates in both the compressor cooling mode and the natural cold source cooling mode, and the condensing portion 2a and the condensing portion 2b simultaneously perform condensation processing.

For example, the cooling mode of the air conditioning system can be selected based on the difference between the refrigerant gas temperature and the outdoor temperature. When the outdoor ambient temperature is high, the system operates in a conventional compressor mode. When the outdoor temperature is low and the refrigerant temperature is higher than the outdoor temperature, the system can operate in the natural cold source cooling mode or in the same manner as the cooling demand in the compressor mode and the natural cold source cooling mode. Alternatively, in practical applications, the switching of the two cooling modes may also be manually controlled, etc., and will not be described here.

Furthermore, when the air conditioning system operates in a manner in which the two modes of operation are performed simultaneously, ie the switching device 6 is operating in the third mode, the switching device 6 can be configured to be able to adjust its first and second paths automatically or manually. The opening degree, thereby controlling the flow resistance of the first passage and the second passage, thereby controlling the amount of refrigerant passing through the first and second passages per unit time.

In one example, when the outdoor temperature is low so that natural cooling can be used to satisfy most of the cooling demand, the opening of the switching device 6 can be adjusted to reduce the opening of the first passage and increase the opening of the second passage. At the same time, the power of the compressor 1 can be reduced as long as it can supplement the cooling demand other than the natural cold source refrigeration.

In another example, when the temperature difference between the outdoor temperature and the refrigerant is small, and the natural cold source can only meet a small part of the cooling demand, the opening degree of the switching device 6 can be adjusted to increase the opening degree of the first passage, and decrease the second. The opening of the passage, and at the same time, increases the power of the compressor 1 to supplement the refrigeration demand other than natural cold source refrigeration.

The adjustment of the opening and the control of the compressor power can be adjusted depending on the temperature of the refrigerant in the reservoir, the pressure in the reservoir, or the temperature or pressure at the evaporator (ie, the end of the air conditioning system). In the air conditioning system shown in Fig. 1, the term "condensing device" means a device capable of condensing a refrigerant, that is, a heat exchanger that cools and liquefies a high-temperature refrigerant gas. In practical applications, specific condensation equipment can be selected independently. For example, the condensing device 2 can be realized by one condensing device or at least two condensing devices connected in parallel. In this case, the input of the at least two condensing devices connected in parallel serves as the input of the condensing device, and the output of the at least two condensing devices in parallel serves as the output of the condensing device. Of course, the condensing device can also be combined in series, series and parallel. The condensing device can be cooled by air cooling, water cooling or evaporative condensation.

Further, the condensing portion 2a and the condensing portion 2b of the condensing device 2 can be realized by using different condensing devices or different portions of a single condensing device.

In the air conditioning system shown in Fig. 1, the number of evaporators may be one or more, and the specific number is not limited. The outputs of the individual evaporators 8 can be connected to the inputs of the switching device 6, respectively. Alternatively, the respective evaporators 8 may be merged and connected to the input end of the switching device 6, and the present invention is not limited thereto. The connection of the input end of each evaporator 8 to the output end _Otl of the liquid storage tank 5 is also the same. The form of connection between the evaporators can be in parallel, in series, or a combination of parallel and series.

Further, in the air conditioning system shown in Fig. 1, the liquid storage tank 5 can be realized by a low pressure liquid storage tank or a separator, but is not limited thereto. The on-off valve used in the present invention, such as the on-off valve 41, may be manual, such as a manual ball valve; it may also be electric, such as a solenoid valve, an electric ball valve.

The simultaneous operation of the natural cold source cooling mode and the compressor cooling mode enables the maximum use of outdoor low temperature air for refrigeration, and the compressor only serves as an auxiliary supplement. Thereby reducing the power loss and power consumption of the air conditioning system, achieving the purpose of saving energy.

According to the air conditioning system of the first embodiment, the condensing portion for the natural cold source cooling mode and the compressor cooling mode is completely independent. In some embodiments, each condensing portion can also be shared in both modes.

Fig. 2 is a schematic view showing the configuration of an air conditioning system according to a second embodiment of the present invention. The air conditioning system according to this embodiment differs from the air conditioning system according to the first embodiment in that it further includes an on-off valve 42 and an on-off valve 43.

2, the on-off valve 42 (as the "second on-off valve" example) is disposed between the first end of the output terminal O _c and the input terminal of the condensing portion 2a of the compressor 1, and the on-off valve The second end of the 42 is disposed between the outlet of the second passage of the switching device 6 and the input of the condensing portion 2b. The first end of the on-off valve 43 (as an example of the "third on-off valve") is disposed at the output end of the condensing portion 2a and flow control Between the input ends of the valve 3, and the second end of the on-off valve 43 is disposed between the output end of the condensing portion 2b and the input end of the on-off valve 41.

The combination and separation of the condensing sections in different operating modes can be achieved using the on-off valve 42 and the on-off valve 43 as set forth above. Specifically described below.

When the air conditioning system is operating in the compressor cooling mode, the compressor 1 is operated, the on-off valves 42 and 43 are opened, the on-off valve 41 is closed, and the switching device 6 is switched to the first passage. At this time, the condensing portions 2a and 2b of the condensing device 2 condense the refrigerant gas supplied from the compressor. When the air conditioning system is operating in the natural cold source cooling mode, the compressor 1 is stopped, the on-off valves 41, 42 and 43 are all turned on, and the switching device 6 is switched to the second path. At this time, the condensing portions 2a and 2b of the condensing device 2 condense the refrigerant vapor directly from the evaporator 8. When the air conditioning system simultaneously operates the two modes of compressor cooling and natural cold source cooling, the on-off valves 42 and 43 are closed, the on-off valve 41 is opened, and the switching device 6 can be configured to automatically or manually adjust the opening degree so that partial cooling The agent gas flows to the liquid storage tank 5 and further flows into the compressor 1, and partially flows to the condensing portion 2b of the condensing device 2. At this time, the condensing portion 2a of the condensing device 2 condenses the refrigerant gas supplied from the compressor, and the condensing portion 2b of the condensing device 2 condenses the refrigerant vapor directly from the evaporator 8.

As apparent from the above, the air conditioning system of the second embodiment can improve the efficiency of use of the condenser as compared with the first embodiment.

As mentioned above, the switching device 6 can be constructed using a device other than the switching valve as long as the path can be switched in three ways. The three modes are: the first path is turned on and the second path is turned off, the first path is turned off, and the second path is turned on, and both paths are turned on.

Fig. 3 is a schematic view showing the configuration of an air conditioning system according to a third embodiment of the present invention. In this example, instead of using the switching valve, the switching means may include an output terminal 6 provided on the evaporator 8 to the input terminal I of the reservoir tank 5 between _t2-off valve 44 (as the "fourth on-off valve is" in An example), and an on-off valve 45 (as an example of a "fifth on-off valve") disposed between the output of the evaporator 8 and the input of the condensing portion 2b of the condensing device 2. Alternatively, a one-way valve may be used to replace the on-off valve 45. Although the on-off valves 44 and 45 shown in FIG. 3 are solenoid valves, it will be appreciated that other on-off valves, such as manual ball valves or electric ball valves, electric two-way valves, may be employed. In some embodiments, the opening of the on-off valves 44 and 45 can be adjusted.

When the air conditioning system is operating in the compressor cooling mode, the on-off valve 44 is opened and the on-off valve 45 is closed. In other words, the first passage of the switching device 6, i.e., the line in which the on-off valve 44 is located, opens, and the second passage of the switching device 6, i.e., the line in which the on-off valve 45 is located, is closed. When the air conditioning system is operating in the natural cold source cooling mode, the on-off valve 45 is opened and the on-off valve 44 is closed. In other words, the second passage of the switching device 6, i.e., the line in which the on-off valve 45 is located, opens, and the first passage of the switching device 6, i.e., the line in which the on-off valve 44 is located, is closed. When the two modes of the air conditioning system are simultaneously operated, the on-off valves 44 and 45 are both turned on, and in some embodiments, the opening degree of the opening can be adjusted according to parameters such as the end pressure, temperature, and the like of the air conditioning system.

Fig. 4 is a schematic view showing the configuration of an air conditioning system according to a fourth embodiment of the present invention. The difference between this embodiment and the second embodiment described with reference to Figure 2 is that: the outputs of the evaporator are grouped and connected to the reservoir (and thus to the compressor) and the condensing device via a switching valve corresponding to the grouping In the condensing part of natural cold source refrigeration, the complexity of control is reduced when switching in different operating modes.

The case where the switching device includes two switching valves 61 and 62 is shown in FIG. Accordingly, the output ends of the evaporator 8 are divided into two groups and are respectively connected to the switching valves 61 and 62 corresponding to the group to be switchably connected to the input terminal I _{t2 of the} liquid storage tank 5 via the switching valves 61 and 62 And the input end of the condensing portion 2b.

When operating only in the compressor cooling mode, the switching valves 61 and 62 are both switched to the liquid storage tank 5; when operating only in the natural cold source cooling mode, the switching valves 61 and 62 are switched to the condensing portion of the condensing device 2 2b; While the compressor refrigeration and the natural cold source refrigeration are simultaneously operated, one of the switching valves 61 and 62 is switched to the liquid storage tank 5, and the other is switched to the condensing device 2. In other embodiments, the switching device can also be implemented by more than two switching valves, and the outputs of the evaporator 8 are correspondingly grouped into the same number of switching valves.

Similarly, the output of the evaporator 8 can also be grouped when the switching device is implemented with an on-off valve (or a one-way valve). Fig. 5 is a schematic view showing the configuration of an air conditioning system according to a fifth embodiment of the present invention. In this embodiment, the switching device is implemented with a number of on-off valves or one-way valves.

For example, the output of the evaporator 8 are grouped, a portion of the packet is input valve 44 is connected to the liquid reservoir 5 via the terminal I _t2 off, and another portion of the packet to be 45 via a check valve (as the "first An example of a four-way valve "may also be an on-off valve 45 as described in the third embodiment) connected to the input end of the condensing portion 2b. Also, an on-off valve 46 (as an example of a "sixth on-off valve") is provided between a portion of the packet and another portion to control the on-off between the respective groups.

The on-off valves 44 and 46 are opened when the air conditioning system is only operating in the compressor cooling mode. If the on-off valve 45 is provided on the second passage of the switching device as in the third embodiment, the on-off valve 45 is closed. Further, as described above, the on-off valves 41 and 42 are opened, and the on-off valve 43 is closed. In the example shown in Fig. 5, a check valve 45 is provided. Since the compressor 1 is operated and the on-off valve 42 is opened, the output pressure of the check valve 45 is higher than the input end pressure, and thus the check valve 45 is blocked (closed), and the refrigerant vapor cannot pass through the single To the valve 45, it is transferred to the condensing device 2.

When the air conditioning system is only operating in the natural cold source cooling mode, the on/off valves 41, 42 and 43 are opened, the on-off valve 44 is closed, and the on-off valve 46 is opened. Due to the check valve 45, there is no blocking pressure difference between the input and output ends, and thus the refrigerant vapor flows into the condensing device 2 via the check valve 45. Further, when the on-off valve 45 is employed instead of the one-way valve 45' as described in the third embodiment, the on-off valve 45 is opened.

When the air conditioning system simultaneously operates compressor refrigeration and natural cold source refrigeration, the on/off valves 41 and 44 are opened, and the on-off valves 42, 43 and 46 are closed. The one-way valve 45 has no blocking pressure difference at the input and output ends, so refrigerant vapor from one of the evaporators 8 group can flow into the condensing portion 2b of the condensing device 2 via the one-way valve 45, and the other from the evaporator 8 A group of refrigerant vapor flows into the liquid storage tank 5 via the on-off valve 44, thereby supplying refrigerant gas to the compressor 1.

Although only the case where the output ends of the evaporator 8 are divided into two groups is shown in FIG. 5, in other embodiments, it may be divided into a plurality of groups as long as each group can be switched to the switching device by means of a switching valve or the like, respectively. The first or second path is sufficient. Further, in the present specification, all the modifications suitable for the second embodiment shown in Fig. 2 are also suitable for the first embodiment shown in Fig. 1.

Fig. 6 is a schematic view showing the configuration of an air conditioning system according to a sixth embodiment of the present invention. Embodiment differs from the fourth embodiment of the present embodiment in that: further comprising a switching valve disposed in the reservoir 41 and the output terminal of the on-off valve 5 between the output terminal O _tl 47 (as "the seventh on-off valve "Example of". The setting of the on-off valve 47 makes it possible to supply the evaporator to the evaporator by bypassing the liquid storage tank 5 by opening the on-off valve 47 in some cases when the liquid supply tank 5 is insufficiently supplied with liquid. This is especially useful when the air conditioning system is provided with a power unit located between the liquid storage tank 5 and the evaporator 8. The setting of the on-off valve 47 can prevent damage or ineffective operation of the power equipment caused by insufficient liquid supply to the power equipment.

In the air conditioning system according to an embodiment of the present invention, a circulating power mechanism may be disposed between the output end _{Otl of the} liquid storage tank 5 and the input end of the evaporator 8 to assist in circulation of the refrigerant in the air conditioning system. The "mechanism" may be realized by three means: by adding new components; by adjusting the configuration relationship of specific components based on existing components, such as cooperation, positional relationship; by combining the above two means to realise. According to the different needs and characteristics of the air conditioning system, the technology in the field can be Various ways that personnel can think of to achieve a circular power mechanism can provide a circulating power for the refrigerant.

In connection with various embodiments of the present invention, specific examples of the cyclic power mechanism may be, for example: (1) there is a positive drop in height between the output end of the liquid storage tank 5 (3⁄4 and the input end of the evaporator 8) to pass the power The way in which the potential energy is converted into kinetic energy provides the circulating power of the refrigerant; (2) the output end O _{tl of the} liquid storage tank 5 is connected to the input end of the evaporator 8 via the power device 7 to provide the refrigerant by converting electrical energy into mechanical energy. Circulating power; or, (3) there is a positive drop in the height between the output end of the liquid storage tank 5 (3⁄4 and the input end of the evaporator 8), and the output end O _{tl of the} liquid storage tank 5 is connected via the power device 7 in parallel with each other And the on-off valve 48 (as an example of an "eight-way valve") is connected to the input of the evaporator 8, ie the combination of the examples (1) and (2).

Fig. 7 is a schematic view showing the configuration of an air conditioning system according to a seventh embodiment (i.e., example (3)) of the present invention. The on-off valve 48 may be an on-off valve or a parallel connection of a plurality of on-off valves, but is not limited thereto. And the on-off valve 48 may be an automatic or manual valve member such as an electric ball valve or a manual ball valve, but is not limited thereto. The power unit 7 may be a pump or a parallel connection of a plurality of pumps, but is not limited thereto.

According to the air conditioning system of the seventh embodiment, the power device can be turned off when only the compressor is operated to be cooled

7. Open the on-off valve 48; start the power device 7 when only the natural cold source cooling is operated, and close the on-off valve 48; and when the two cooling modes are simultaneously operated, the power device 7 is turned on or off according to the need of the system for the circulating power. (or part or all of the power unit), and can control the opening and closing of the on-off valve 48. This can be completely controlled according to the needs of the system, and will not be described here.

Further, when the compressor 1 is an oil compressor, the compressor 1 can be provided with a return oil mechanism to operate the compressor 1 in a good state and prolong the life of the compressor 1. An embodiment of the oil return mechanism will be described below with reference to Figs. 8 to 11 are schematic views showing the configuration of an air conditioning system according to eighth to eleventh embodiments of the present invention.

In the eighth embodiment shown in FIG. 8, the oil return mechanism can be realized as: the output end O _{t3 of the} liquid storage tank 5 (as an example of "the third output end of the first liquid storage tank") is connected to the compressor 1 input I _cl (as an example of "a first input of the compressor"), the presence of the reservoir and the drop in height between the positive input terminal I _cl 5 O _t3 output of the compressor.

Generally, the density of the oil is less than the density of the refrigerant, and therefore, the oil generally floats on the surface of the refrigerant in the liquid storage tank 5. Thus, as shown in 8, the output end O _{t3 of the} liquid storage tank 5 can be disposed in the liquid storage tank 5 The liquid level is slightly lower, so that the oil return can be smoothly achieved through the output end o _t3 . The distance between the position of the output end o _t3 and the liquid level can be set autonomously, and is not limited herein. Furthermore, the output port o _t3 may comprise one or more openings on the side wall of the reservoir 5 . Also, when a plurality of openings are included, the plurality of openings may be aligned from a highest liquid level to a lowest liquid level of the liquid storage tank 5. In practical applications, the plurality of openings may be opened or closed depending on the actual liquid level position in the reservoir 5. The oil return mechanism can increase the oil return rate of the oil-filled compressor without adding any components, so that the oil-filled compressor can continue to operate normally.

In the ninth embodiment shown in FIG. 9, an oil return mechanism may be implemented as follows: the output terminal O _t3 reservoir 5 is connected to the input terminal I _pl ejector pump 15 (as the "first input of the ejector pump" As an example, the output Op of the ejector pump 15 is connected to the input I _{cl of the} compressor 1 .

In general, the pressure at the input I _cl of the compressor 1 is less than the pressure in the reservoir 5, so that oil return is achieved by the pressure difference between the two. In addition, the ejector pump 15 changes the internal area, and the pressure energy and the kinetic energy are mutually converted to form different pressure differences. The ejector pump 15 is, for example, a Laval tube, but is not limited thereto. Similarly, in the present embodiment, the output terminal O _t3 reservoir 5 may be also provided to the reservoir tank at a position slightly closer to the liquid surface 5. Alternatively, the output _Ot3 may include one or more openings on the side wall of the reservoir 5.

Advantage of the ninth embodiment is that: in comparison to the positive gap is provided between the reservoir 5 and the output terminal O _t3 compressor input I _cl 1 of the eighth embodiment, the oil return mechanism for reducing the ninth embodiment The requirement for the installation space of the air conditioning system can reduce the amount of liquid entering the input end I _cl of the compressor 1, thereby preventing damage of the compressor 1 due to excessive liquid inflow.

In order to further increase the oil return rate and reduce the amount of liquid flowing back to the compressor, a further improvement can be provided. As shown in Figure 10, the ejector pump 15 has two inputs,

_{输出 ρ2} ; The output end O _{t3 of the} liquid _storage tank 5 is connected to the input end I _pl of the ejector pump 15 , and the input end I _{p2 of the} ejector pump 15 (as an example of the "second input end of the ejector pump") is connected to the compression Between the output of the machine 1 and the input of the condensing portion 2a, the output Op of the ejector pump 15 is connected to the input I _{cl of the} compressor 1.

Although, in the tenth embodiment of Fig. 10, the input terminal _{Ip2 of the} ejector pump 15 is connected between the output end of the compressor 1 and the input end of the condensing portion 2a of the condensing device 2, it is not limited thereto. In fact, as long as the input end I _{p2 of the} ejector pump is connected to the high pressure line of the compressor refrigeration circuit of the air conditioning system. At this time, the line pressure at the input end I _p2 of the ejector pump 15 is higher than the pressure in the ejector pump 15, and there is a pressure difference therebetween. Moreover, the pressure in the ejector pump 15 is higher than the pressure in the compressor 1, and there is also a pressure difference therebetween. Therefore, the mixture of the refrigerant and the lubricating oil is returned to the ejector pump 15 by the pressure difference between the input terminal _Ip2 of the ejector pump 15 and the ejector pump 15, in the ejector pump 15 and the reservoir 5 The output of the O _t3 backflow oil (interposed with refrigerant) interacts. Specifically, in the ejector pump 15, the high temperature refrigerant and the low temperature refrigerant are neutralized, and since the pressure is lowered, the refrigerant liquid evaporates into a gas, and the lubricating oil does not undergo a phase change. Thereafter, the lubricating oil (and the refrigerant gas) continues to flow back into the compressor 1 by the pressure difference between the ejector pump 15 and the compressor 1, thereby realizing the high pressure injection ejector returning oil.

In the tenth embodiment, as explained above, in the ejector pump 15, since the pressure is lowered and the temperature is neutralized, most of the refrigerant liquid evaporates into a gas before returning to the compressor, thereby reducing the pair. Damage to the compressor.

Further, in the eleventh embodiment shown in FIG 11, further comprising an oil separator 16, wherein the input terminal of the output O _c of the compressor connected to the oil separator 16 is I _d, the output of the oil separator of O 16 _Dl (as an example of the "first output of the oil separator") is connected to the input of the condensing portion 2a, and the output of the oil separator 16 (as an example of the "second output of the oil separator") is connected to the compressor 1 Input I _c2 (as an example of "the second input of the compressor").

When the compressor 1 is operated, the high pressure refrigerant gas discharged from the output terminal o _c compressor 1, the oil separator through an output terminal O _d 16 of 2 to the condensing device condensing portion 2a. Upon passing through the oil separator 16, the lubricating oil entrained in the high-pressure refrigerant gas is separated by the oil separator 16, and is discharged from the output end _{Od2 of the} oil separator, and is sent back to the compression from the input end _{Ic2 of the} compressor 1. Machine 1. The arrows in the figure show the flow direction of the fluid (refrigerant gas or lubricating oil) in each line. Here, the oil separator 16 may employ various oil separators known in the art, and the specific connection manner with the compressor depends on the type of the oil separator, and is not limited to the example of Fig. 11. When the compressor 1 is an oil compressor, the oil separator is provided to reduce the amount of oil entering the refrigerant of the compressor 1, thereby improving the efficiency of the air conditioning system and saving energy.

In addition, a drying filter and/or a sight glass may be further provided in the oil return line of the oil separator and the compressor. As shown in FIG. 11, the drying filter 111 and/or the sight glass 121 may be disposed on the oil return path of the oil separator 16 to the oily compressor 1. Here, the oil return output of the oil separator 16 The input end I _{c2 of the} oil return of the oil separator 1 of the oil compressor 1 is connected in turn through the drying filter 111 and the sight glass 121. The drying filter 111 is used to filter out moisture in the return lubricating oil.

Further, an on-off valve (not shown) may be disposed on the path in which the drying filter 111 and the sight glass 121 are located. Specifically, the on-off valve may be disposed between the drying filter 111 and the oil return output O _{d2 of the} oil separator 16 or the input end I of the liquid mirror 121 and the oily compressor 1 receiving the oil separator returning oil Between _c2 , or between the drying filter 111 and the sight glass 121, and the like. The function of the on-off valve is to control the amount of oil return between the oil separator 16 and the compressor 1 by its own on-off or opening adjustment.

Figure 12 is a schematic view showing the configuration of an air conditioning system according to a twelfth embodiment of the present invention. The present embodiment is different from the eleventh embodiment in that the air conditioning system according to the present embodiment further includes a liquid storage tank 10 (as a "second liquid storage tank") for assisting in storing the refrigerant in the air conditioning system. ). As shown in Fig. 12, the liquid storage tank 10 can be connected between the output end of the condensing portion 2a and the input end of the flow control valve 3.

Generally, the liquid storage tank 10 can be realized by a high pressure liquid storage tank, but is not limited thereto. The liquid storage tank 5 can be realized by a low pressure liquid storage tank, but is not limited thereto. Since the volume of the liquid storage tank 5 is often affected by the size of the air conditioning system unit, the liquid storage tank 10 is provided to prevent the indoor unit of the air conditioning system from being turned off or the indoor load is changed to cause a change in the circulation amount of the system refrigerant. The liquid storage tank 10 is capable of storing the refrigerant when the amount of refrigerant circulation changes. When the liquid storage tank 10 is realized by the high pressure liquid storage tank, more refrigerant can be accommodated with respect to the liquid storage tank 5, thereby further optimizing the cooling effect of the air conditioning system.

It should be noted that the shape of the liquid storage tank 10 is not limited by the figure, and the position of the inlet and outlet is only illustrative. Further, the liquid storage tank 5 is also merely illustrative in the drawings, and may be various shapes such as a circular shape, an elliptical shape, and a square shape, and is not limited thereto. In addition, the liquid storage tank 5 or the liquid storage tank 10 may be installed in various manners such as vertical installation or horizontal installation, and is not limited herein.

In some embodiments, a dry filter and/or a sight glass may also be installed between the condensing portion 2a and the flow control valve 3. In the embodiment shown in Fig. 12, the drying filter 11 and the sight glass 12 are installed between the liquid storage tank 10 and the flow rate control valve 3. The drying filter 11 is for filtering out moisture in the refrigerant. The connection relationship between the drying filter 11 and the sight glass 12 and the condensing device 2 and the liquid storage tank 5 may include: the output end of the condensing portion 2a is connected to the input end of the flow control valve 3 through the drying filter 11; or, the condensing portion The output end of the 2a is connected to the input end of the flow control valve 3 through the sight glass 12; or the output end of the condensing portion 2a is connected to the flow control valve 3 through the drying filter 11 and the sight glass 12 in sequence. Input. By adding a dry filter and a sight glass, it is possible to absorb and observe the moisture in the refrigerant to prevent the excess moisture in the refrigerant from causing a decrease in the amount of refrigeration.

Figure 13 is a schematic view showing the configuration of an air conditioning system according to a thirteenth embodiment of the present invention. In the present embodiment, the liquid storage tank 10 is provided with a bypass line 10a connected in parallel thereto. The first end of the bypass line 10a is disposed between the output end of the condensing portion 2a of the condensing device 2 and the input end of the liquid storage tank 10, and the second end of the bypass line 10a is disposed at the output of the liquid storage tank 10. The end is connected to the input of the flow control valve 3.

When the air supply system is unstable, or when the compressor is not operating (ie, operating in the natural cold source cooling mode), the bypass line 10a is disposed such that the refrigerant can be bypassed to the liquid storage tank 10 and directly delivered to the flow rate. The input of the control valve 3. Thereby, the supply of refrigerant to the liquid storage tank 5 is accelerated and stabilized, and the resistance in the circulation is reduced.

In the embodiment of Fig. 13, the second end of the bypass line 10a is directly connected to the input end of the flow control valve 3. In other embodiments, for example, the second end of the bypass line 10a may also be connected between the reservoir 10 and the dryer 11, between the dryer 11 and the sight glass 12, and the like. In other words, as long as the bypass line 10a is disposed, the transfer of the refrigerant can be bypassed by the liquid storage tank 10. The same is true for the arrangement of the first end of the bypass line 10a.

14 and 15 are schematic views showing the structure of an air conditioning system according to the fourteenth and fifteenth embodiments of the present invention, respectively.

In order to prevent the power equipment that is used as the circulating power mechanism from being used to reduce the loss of the power equipment in the case where the refrigerant circulation amount in the air conditioning system is relatively small, it can be set to be used according to the detected liquid level in the low pressure liquid storage tank. Control to start or stop the level controller of the power unit.

In the example shown in Fig. 14, the two liquid level detecting ends of the liquid level controller 14 (as an example of the "first liquid level controller") can be respectively set at the allowable maximum liquid level and the minimum allowable liquid of the liquid storage tank 5. Where, but not limited to. The signal output of the level controller 14 is coupled to the control terminal of the power unit 7, thereby controlling the opening and closing of the power unit 7 by the output signal of the level controller 14. In a specific application, for example, the liquid level controller 14 can output a signal detected by the liquid level detecting end to a control device such as a control board. The control board then generates a control signal by logic calculation and outputs the control signal to the power unit 7. Specifically, the liquid level controller 14 can be used to: when it is detected that the liquid level of the liquid storage tank 5 is equal to or higher than the allowable minimum liquid level (the low level detecting end detects the liquid, the high level detecting end detects or does not detect the liquid ) , The control power device 7 is turned on; when the liquid level is detected to be lower than the allowable minimum liquid level (the liquid is not detected by the low level detecting end), the control power device 7 is stopped. This ensures that the power unit 7 is only turned on if the liquid level is sufficient to prevent excessive loss of the power unit 7. The arrangement of the level controller 14 and the control rules for the power unit 7 based on the resulting detection signals can be determined as needed.

Further, when the flow control valve 3 located between the condensing device 2 and the liquid storage tank 5 is controllable, a flow control valve 3 for setting the flow rate according to the liquid level in the detected liquid storage tank 5 may be provided on the liquid storage tank 5. A liquid level controller 13 that performs control. Specifically, the liquid level controller 13 can control the opening degree of the flow control valve based on the detected liquid level in the liquid storage tank 5.

As shown in FIG. 15, for example, the two liquid level detecting ends of the liquid level controller 13 can be respectively connected to the allowable maximum liquid level of the liquid storage tank 5 and the minimum allowable liquid level, and the signal output end of the liquid level controller 13 is connected. The control end of the flow control valve 3. The liquid level controller 13 is for detecting the liquid level in the liquid storage tank 5, and controls the flow rate control valve 3 according to the liquid level in the detected liquid storage tank 5. The control here may be to turn the control on or off, or to perform linear or non-linear control, etc., which is not limited herein.

At this time, the flow control valve 3 can be realized by an electric flow control element, and the corresponding electric signal is sent from the liquid level controller 13 to control the flow control valve 3. Alternatively, the level controller 13 and the flow control valve 3 can also be realized mechanically. For example, a float ball is provided in the liquid storage tank to sense the liquid level, and when the liquid level is low, the liquid supply port is opened, and when the liquid level is reached, the liquid supply port is closed. Then the float ball here corresponds to the liquid level controller 13 and the liquid supply port corresponds to the flow control valve 3. Of course, in the practical application, the liquid level controller 13 and the flow control valve 3 can have other implementation manners, which are not described herein.

Specifically, the liquid level controller 13 can be configured to: detect that the liquid level of the liquid storage tank 5 is lower than a preset first liquid level value, control the flow control valve 3 to open or increase the liquid supply; and detect the liquid level of the liquid storage tank 5. Above the preset second level value, the flow control valve 3 is controlled to shut down or reduce the supply of liquid. Thereby, the liquid level in the liquid storage tank 5 is ensured to be between the first liquid level value and the second liquid level value. Here, the second liquid level value is greater than the first liquid level value. The first liquid level value and the second liquid level value may be respectively taken as the liquid level value corresponding to the minimum liquid level and the maximum liquid level allowed, or other liquid level values may be set autonomously. It can be set according to the actual application environment, and is not limited here. In a specific application, for example, the liquid level controller 13 can output a signal detected by the liquid level detecting end to a control device such as a control board. The control board then generates a control signal through logic calculation and outputs a control signal to the flow control valve 3.

It should be noted that the liquid level controllers 13 and 14 are separately described herein for the sake of clarity. And In practical applications, the two can also be realized as: A liquid level detector is arranged on the liquid storage tank 5, and the detector outputs the liquid level detection signal to the control board in the form of an electric signal, which is performed by the CPU of the control board. After the processing, signals for controlling the power unit 7 and signals for controlling the flow rate control valve 3 are separately generated and output to the power unit 7 and the flow rate control valve 3, respectively, for control (as an example of the "third level controller").

Further, in order to prevent the refrigerant from flowing back in the refrigeration cycle in the air conditioning system, a check valve may be provided in the air conditioning system. Figure 16 is a schematic view showing the configuration of an air conditioning system according to a sixteenth embodiment of the present invention. As shown in Fig. 16, the first output end (the output end of the first path) of the switching device 6 (in the present embodiment, the combination of 61, 62) is via the check valve 91 (as the "first check valve"). Example) Connecting the input end I _{t2 of the} liquid storage tank 5; the second output end of the switching device 6 (the output end of the second passage) is connected to the condensing device 2 via the check valve 92 (as an example of the "second check valve") condensing part 2b input; the compressor 1 and the output terminal connected to an input terminal O _c condensing section 2a of the condensing device 2 via the check valve 93 (as the "third one-way valve" example). In the present embodiment, since a device such as the oil separator 16 is further included, the check valve 93 can be connected between the output end of the oil separator 16 and the input end of the condensing portion 2a. The configuration of the check valves 91, 92, and 93 prevents the refrigerant from flowing back into the evaporator 8 or the compressor 1, respectively. Alternatively, the one-way valves 91, 92, and 93 may be selectively provided separately.

Further, in the embodiment shown in Fig. 16, a flow control valve is provided at the input end of each of the evaporators 81, 82, 83 and 84 connected in parallel to the output end _Ot of the liquid storage tank 5 (as " An example of two flow control valves, thereby controlling the amount of refrigerant supplied to each evaporator. Here, the evaporators 81, 82, 83 and 84 may each be a single evaporator, a series, a parallel connection of a plurality of evaporators, or a combination of series and parallel.

In the air conditioning system according to an embodiment of the present invention, the compressor 1 may be formed by at least one compression mechanism. When the compressor 1 includes two or more compressors (not shown), the compressors may be connected in parallel with each other, and the inputs of the compressors connected in parallel are collectively used as the input end of the compressor 1, and are compressed in parallel with each other. The outputs of the machine together act as the output of the compressor 1.

The compressor 1 is constructed by connecting at least two compressors in parallel, and the cooling is performed with respect to using one compressor, thereby improving the ability of the air conditioning system to meet different cooling requirements, and at the same time ensuring that the air conditioning system is always operating at an optimum working condition. For example, when the cooling demand is small, only one or part of the compressor can be controlled. Turn on, and when the cooling needs to be increased, control more or all of the compressor is turned on. According to different cooling requirements, the number of compressors is controlled to improve the cooling efficiency of the air conditioning system and reduce the power loss of the air conditioning system.

In the various embodiments described above, the flow control valve 3 may be implemented using an electronic expansion valve, a two-way valve, an electric ball valve, a thermal expansion valve, or an orifice + control valve, but is not limited thereto.

In practical applications, a fan is required in the vicinity of the evaporator, and the air flow speed around the evaporator is accelerated by the fan to accelerate the exchange of heat between the evaporator and the outside temperature. The cooling method of the condensing equipment is air-cooled and water-cooled. When the condensing device adopts the air-cooled cooling mode, a fan is required in the vicinity of the condensing device, the air flow speed around the condensing device is accelerated by the fan, and the heat exchange between the condensing device and the outside temperature is accelerated; when the condensing device is cooled by water cooling In the mode, a cooling water pipeline is required in the vicinity of the condensing device, and cold and heat exchange is performed between the cooling water pipeline and the outside temperature.

The air conditioning system described in each of the above embodiments may be an air-cooled screw type air conditioning system, a water-cooled screw type air conditioning system, an air-cooled scroll type air conditioning system, or a water-cooled scroll type air conditioning system.

The present invention has been described in detail with reference to the accompanying drawings, and the embodiments of the present invention are not to be construed as limiting the scope of the disclosure. In the case of ensuring that the basic functions of the air conditioning system can be realized, the configuration of the relevant functional components in the embodiments described above in connection with the drawings can be arbitrarily combined, and the air conditioning system obtained by these combinations should also be considered to fall within the present disclosure. Within the scope of protection.

As used herein, "first", "second", etc. (eg, "first output", "second output", "first input", "second input", etc.), The distinction of the terminals or the like of the respective components or components is made only for the sake of clarity of description, and is not intended to limit any order or emphasize importance or the like. Further, the term "connected" as used herein may be directly connected, or may be indirectly connected via other components, unless otherwise specified.

The present invention has been described in the foregoing specification with reference to the specific embodiments. However, it is understood by those skilled in the art that various modifications and changes can be made without departing from the scope of the invention as defined by the appended claims.

Claims

Rights request

An air conditioning system, comprising: a first liquid storage tank, a compressor, a condensing device, a first flow control valve, a first on-off valve, an evaporator, and a switching device; wherein

a first input end of the compressor is connected to a second output end of the first liquid storage tank, an output end of the compressor is connected to an input end of the first condensation portion of the condensation device, and an output end of the first condensation portion is first a flow control valve is connected to the first input end of the first liquid storage tank, and the first output end of the first liquid storage tank is connected to the input end of the evaporator;

An output end of the evaporator is connected to a second input end of the first liquid storage tank through a first passage of the switching device, and an output end of the evaporator is connected to an input end of the second condensation portion of the condensation device through a second passage of the switching device ;

An output end of the second condensing portion is connected to a first input end of the first liquid storage tank via a first on-off valve;

The switching device is configured to be operable in three ways: a first mode in which the first passage is open and the second passage is closed, a second manner in which the first passage is closed and the second passage is open, and both the first passage and the second passage The third way to open.

2. The air conditioning system according to claim 1, further comprising a second on-off valve and a third on-off valve, wherein

a first end of the second on-off valve is disposed between an output end of the compressor and an input end of the first condensing portion, and a second end of the second on-off valve is disposed at the switching Between the outlet of the second passage of the device and the input of the second condensing portion;

a first end of the third on-off valve is disposed between an output end of the first condensation portion and an input end of the first flow control valve, and a second end of the third on-off valve is disposed at An output end of the second condensing portion is between the input end of the first on-off valve.

The air conditioning system according to claim 1 or 2, wherein the switching device is configured to When operating in the third mode, the opening of the first passage and the second passage can be adjusted to control the flux of the refrigerant passing through the first passage and the second passage.

The air conditioning system according to any one of claims 1 to 3, wherein

The switching device is a switching valve; or

The switching device includes a fourth on-off valve disposed between the evaporator output to a second input of the first reservoir, and a second condensation disposed at the evaporator output to the evaporator A fifth on-off valve or a fourth one-way valve between the input ends.

5. The air conditioning system according to claim 4, wherein the outputs of the evaporator are grouped, a portion of the group being connected to the second input of the first liquid storage tank via the fourth on-off valve And another portion of the group is connected to the input of the second condensing portion via the fifth on-off valve; and a sixth on-off valve is provided between a portion of the group and another portion To control the continuity between groups.

The air conditioning system according to any one of claims 1 to 4, wherein the switching device includes at least two switching valves, the outputs of the evaporators are grouped and connected to the respective via respective switching valves a second input of the first reservoir and an input of the second condensing section.

The air conditioning system according to any one of claims 1 to 6, further comprising a seventh on-off valve, wherein the seventh on-off valve is disposed at an output end of the first on-off valve and the first storage Between the first output of the tank.

The air conditioning system according to any one of claims 1 to 10, wherein

a positive drop in height between the first output end of the first liquid storage tank and the input end of the evaporator; or

a first output end of the first liquid storage tank is connected to an input end of the evaporator via a power device; or

There is a positive drop in height between the first output end of the first liquid storage tank and the input end of the evaporator, and the first output end of the first liquid storage tank is connected to each other via a power device and a Eight-way A valve is connected to the input of the evaporator.

The air conditioning system according to any one of claims 1 to 8, wherein when the compressor is an oil compressor,

The third output end of the first liquid storage tank is connected to the first input end of the compressor, and there is a positive drop in height between the third output end of the first liquid storage tank and the first input end of the compressor; or

A third output of the first reservoir is coupled to the first input of the ejector pump, and an output of the ejector pump is coupled to the first input of the compressor.

10. The air conditioning system according to claim 9, wherein: when the air conditioning system includes an ejector pump, a second input of the ejector pump is coupled to an output of the compressor and the first flow Between the inputs of the control valve.

The air conditioning system according to claim 9 or 10, further comprising an oil separator, wherein an output end of the compressor is connected to an input end of the oil separator, and a first output end of the oil separator is connected to the first At the input of the condensing section, the second output of the oil separator is connected to the second input of the compressor.

The air conditioning system according to any one of claims 1 to 11, further comprising: a second liquid storage tank for assisting in storing the refrigerant in the air conditioning system;

Wherein the second liquid storage tank is connected between an output end of the first condensing portion and an input end of the first flow control valve.

13. The air conditioning system according to claim 12, further comprising: a bypass line, the first end of the bypass line being disposed at an output end of the first condensing portion and the second liquid storage tank Between the inputs, and the second end of the bypass line is disposed between the output of the second reservoir and the input of the first flow control valve.

The air conditioning system according to any one of claims 8 to 13, further comprising a first liquid level controller for controlling according to the detected liquid level in the first liquid storage tank to start or stop the Power plant.

The air conditioning system according to any one of claims 1 to 14, further comprising: a second liquid level And a controller for controlling the opening degree of the first flow control valve according to the detected liquid level in the first liquid storage tank.

16. The air conditioning system according to any one of claims 8 to 13, further comprising a third liquid level controller for controlling activation or deactivation of the power device based on the detected liquid level in the first liquid storage tank And controlling the opening degree of the first flow control valve.

The air conditioning system according to any one of claims 1 to 16, wherein

An output of the first passage of the switching device is coupled to a second input of the first reservoir via a first one-way valve; and/or,

An output of the second passage of the switching device is coupled to an input of the second condensing portion via a second one-way valve; and/or,

An output of the compressor is coupled to an input of the first condensing portion via a third one-way valve.

The air conditioning system according to any one of claims 1 to 17, wherein the air conditioning system includes a plurality of compressors connected in parallel to each other.

The air conditioning system according to any one of claims 1 to 18, wherein a second flow control valve is provided at an input end of each evaporator connected in parallel to the first output end of the first liquid storage tank, Thereby the amount of refrigerant supplied to each evaporator is controlled.

The air conditioning system according to any one of claims 1 to 19, wherein the connection form between the evaporators is a combination of parallel, series, or parallel and series.

The air conditioning system according to any one of claims 1 to 20, wherein the air conditioning system is an air-cooled screw type air conditioning system, a water-cooled screw type air conditioning system, an air-cooled scroll type air conditioning system, or a water-cooled scroll type air conditioning system .