Four-way air conditioner outdoor unit, four-way air conditioner unit and control method thereof

Abstract

The application discloses a four-tube air conditioner outdoor unit, a four-tube air conditioner unit and a control method thereof, wherein the refrigeration outdoor unit and the heating outdoor unit of the four-tube air conditioner outdoor unit are integrated together to assemble an outdoor unit, compared with the independent operation of two outdoor units in the prior art, the size of the outdoor unit is reduced, and the occupied space is saved. In addition, since the blowing-out air side of the refrigeration outdoor unit faces the heating outdoor unit, and the blowing-out air side of the heating outdoor unit faces the refrigeration outdoor unit, the cold air passing through the evaporator is sent to the condenser, the condensing efficiency is improved, the hot air passing through the condenser is sent to the evaporator, the evaporating efficiency is improved, and thus the energy efficiency of the whole machine is improved, and the energy consumption of the whole machine is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent household appliances, in particular to a four-pipe air conditioner outdoor unit, a four-pipe air conditioner unit and a control method thereof. BACKGROUND

[0002] The four-pipe air conditioner unit refers to a water system central air conditioner terminal (air conditioner box, fan disc, etc.) which is simultaneously provided with cold and hot coil pipes, each group of coil pipes has one inlet and one outlet, and there are four pipes in total, so it is called four-pipe system.

[0003] Two groups of water pipes are connected to cold water and hot water respectively, that is, at any time of the year, cooling and heating can be switched at any time, and some rooms can be heated while other rooms are cooled.

[0004] The four-pipe air conditioner unit has good adaptability and is suitable for buildings with large depth and internal and external partitions, especially buildings with large curtain walls, to meet the simultaneous cooling and heating requirements. The four-pipe air conditioner unit is mainly applied to places with high comfort requirements such as hospitals, sanatoriums, high-end business hotels and star-rated hotels.

[0005] Reference Figure 1 The traditional four-pipe air conditioner unit includes an indoor unit and two outdoor units, one outdoor unit is used for cooling and the other outdoor unit is used for heating. The two outdoor units operate independently, the cooling outdoor unit A is turned on when cooling is required, and the heating outdoor unit B is turned on when heating is required. The existing four-pipe air conditioner unit has the following disadvantages: the two outdoor units operate independently, occupy a large space, have high energy consumption and low energy efficiency. SUMMARY

[0006] The present application aims to overcome the above technical deficiencies and provide a four-pipe air conditioner outdoor unit, a four-pipe air conditioner unit and a control method thereof to solve the technical problem of the two outdoor units of the four-pipe air conditioner unit operating independently and occupying a large space in the related art.

[0007] To achieve the above technical purpose, the present application adopts the following technical solution:

[0008] According to a first aspect of the present application, a four-pipe air conditioner outdoor unit is provided, comprising:

[0009] a housing, and a cooling outdoor unit and a heating outdoor unit enclosed in the housing, wherein

[0010] the suction air side of the cooling outdoor unit faces the housing, and the air blowing side faces the heating outdoor unit;

[0011] the suction air side of the heating outdoor unit faces the housing, and the air blowing side faces the cooling outdoor unit.

[0012] Preferably, the cooling outdoor unit comprises an outdoor condenser and a first fan.

[0013] The heating outdoor unit comprises an outdoor unit evaporator and a second fan;

[0014] The shell is provided with a fan fixing plate with air vents, the first fan is fixed on the fan fixing plate, and the air outlet surface thereof faces the air outlet side of the outdoor unit condenser; the second fan is fixed on the fan fixing plate, and the air outlet surface thereof faces the air outlet side of the outdoor unit evaporator.

[0015] Preferably, the shell is further provided with a partition plate perpendicular to the fan fixing plate;

[0016] The first fan and the second fan are respectively arranged on the left and right sides of the partition plate.

[0017] Preferably, the outdoor unit condenser is in a semicircular arc shape, and the outdoor unit evaporator is in a semicircular arc shape;

[0018] The outdoor unit condenser and the outdoor unit evaporator are symmetrically arranged on the upper and lower sides of the fan fixing plate and are enclosed in a circular shape; the partition plate is located on the diameter of the circle and is perpendicular to the fan fixing plate, and the first fan and the second fan are symmetrically arranged on the left and right sides of the partition plate.

[0019] Preferably, two air vents are formed in the fan fixing plate, including a first air vent and a second air vent; the first air vent and the second air vent are respectively arranged on the left and right sides of the partition plate;

[0020] The first fan is erected in the first air vent through a fixing frame;

[0021] The second fan is erected in the second air vent through a fixing frame.

[0022] Preferably, the refrigeration outdoor unit further comprises a first compressor connected to the outdoor unit condenser;

[0023] The heating outdoor unit further comprises a second compressor connected to the outdoor unit evaporator;

[0024] The first compressor is arranged in the space between the suction air side of the outdoor unit condenser and the shell; and the second compressor is arranged in the space between the suction air side of the outdoor unit evaporator and the shell.

[0025] Preferably, a plurality of air vents are formed in the shell.

[0026] Preferably, the cross section of the shell is a square or a rectangle; and / or,

[0027] The refrigeration outdoor unit and the heating outdoor unit are both arranged in the shell without contact and are fixed in the shell through a connecting piece.

[0028] According to a second aspect of the present application, a four-pipe air conditioning unit is provided, comprising:

[0029] at least one air conditioner indoor unit, and the four-pipe air conditioning outdoor unit.

[0030] Preferably, the air conditioner indoor units are of the same structure, each comprising:

[0031] an indoor unit evaporator in communication with the refrigeration outdoor unit of the four-pipe air conditioning outdoor unit, a first electronic expansion valve being arranged on the pipeline in communication to control the flow of refrigerant;

[0032] an indoor unit condenser in communication with the heating outdoor unit of the four-pipe air conditioning outdoor unit, a second electronic expansion valve being arranged on the pipeline in communication to control the flow of refrigerant.

[0033] According to a third aspect of the present application, a control method for a four-pipe air conditioning unit is provided, applied to the four-pipe air conditioning unit, comprising:

[0034] in the full or partial refrigeration mode of the indoor units, the first compressor is controlled to be turned on, so that the refrigerant flows out from the first compressor, sequentially passes through the outdoor unit condenser, the first electronic expansion valve, and the end indoor unit evaporator requiring refrigeration, and then returns to the first compressor;

[0035] in the full or partial heating mode of the indoor units, the second compressor is controlled to be turned on, so that the refrigerant flows out from the second compressor, sequentially passes through the end indoor unit condenser requiring refrigeration, the second electronic expansion valve, and the outdoor unit evaporator, and then returns to the second compressor;

[0036] in the partial refrigeration mode and the partial heating mode of the indoor units, the first compressor and the second compressor are simultaneously turned on and operated according to the full or partial refrigeration mode of the indoor units and the full or partial heating mode of the indoor units.

[0037] The technical solutions provided by the embodiments of the present application can include the following beneficial effects:

[0038] By integrating the refrigeration outdoor unit and the heating outdoor unit of the four-pipe air conditioning outdoor unit into one outdoor unit, compared with the independent operation of two outdoor units in the prior art, the size of the outdoor unit is reduced and the occupied space is saved. In addition, since the blowing air side of the refrigeration outdoor unit faces the heating outdoor unit and the blowing air side of the heating outdoor unit faces the refrigeration outdoor unit, the cold air passing through the evaporator is sent to the condenser, the condensing efficiency is improved, the hot air passing through the condenser is sent to the evaporator, the evaporating efficiency is improved, and thus the energy efficiency of the whole machine is improved and the energy consumption of the whole machine is reduced.

[0039] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a circuit schematic diagram of a four-pipe control air conditioning unit according to the background art;

[0041] Figure 2 is a circuit schematic diagram of a four-pipe control air conditioning unit according to an exemplary embodiment;

[0042] Figure 3 is a structural diagram of a four-pipe control air conditioning outdoor unit according to an exemplary embodiment;

[0043] Figure 4 is a circuit schematic diagram of a four-pipe control air conditioning outdoor unit according to an exemplary embodiment;

[0044] Figures 5A-5D is a temperature change curve diagram of the outdoor unit condenser when strengthening the heat exchange of the outdoor unit evaporator according to an exemplary embodiment;

[0045] Figures 6A-6D is a temperature change curve diagram of the outdoor unit evaporator when strengthening the heat exchange of the outdoor unit condenser according to an exemplary embodiment. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0047] As described in the background art, there is a technical problem of large space occupation in the related art that two outdoor units of a four-pipe control air conditioning unit run independently.

[0048] In order to effectively solve the problems in the related art, the present application provides a four-pipe control air conditioning outdoor unit, a four-pipe control air conditioning unit and a control method thereof, which will be described in detail below.

[0049] Embodiment One

[0050] Figure 2 is a circuit schematic diagram of a four-pipe control air conditioning unit according to an exemplary embodiment, as shown in Figure 2 , the four-pipe control air conditioning unit includes a four-pipe control air conditioning outdoor unit 100, as shown in Figure 2 and Figure 3 , the four-pipe control air conditioning outdoor unit 100 includes:

[0051] a housing 101, and a refrigeration outdoor unit 102 and a heating outdoor unit 103 enclosed in the housing, wherein

[0052] the suction air side of the refrigeration outdoor unit 102 faces the housing 101, and the air blowing side faces the heating outdoor unit 103;

[0053] The suction air side of the heating outdoor unit 103 faces the shell 101, and the air blowing side faces the refrigeration outdoor unit 102.

[0054] In specific practice, preferably, a plurality of ventilation holes are arranged on the shell 101. This facilitates the refrigeration outdoor unit 102 to suck in air and dissipate heat, and also facilitates the heating outdoor unit 103 to suck in air and dissipate heat.

[0055] Preferably, the shell 101 has a square or rectangular cross section (a square or rectangular structure facilitates installation and transportation); and / or, the refrigeration outdoor unit 102 and the heating outdoor unit 103 are both arranged in the shell 101 without contact, and are fixed in the shell 101 by connecting members (arranged without contact is to ensure that there is space between the refrigeration outdoor unit 102 or the heating outdoor unit 103 and the shell 101, which facilitates heat dissipation, and can also be used to accommodate other components).

[0056] It can be understood that the technical scheme provided by the embodiment integrates the refrigeration outdoor unit 102 and the heating outdoor unit 103 of the four-pipe air conditioner outdoor unit together to assemble an outdoor unit, which, compared with the independent operation of two outdoor units in the prior art, reduces the size of the outdoor unit and saves the occupied space. In addition, since the air blowing side of the refrigeration outdoor unit 102 faces the heating outdoor unit 103, and the air blowing side of the heating outdoor unit 103 faces the refrigeration outdoor unit 102, the cold air passing through the evaporator is sent to the condenser, the condensing efficiency is improved; the hot air passing through the condenser is sent to the evaporator, the evaporating efficiency is improved, thereby improving the energy efficiency of the whole machine and reducing the energy consumption of the whole machine.

[0057] In specific practice, the refrigeration outdoor unit 102 comprises an outdoor condenser 1021 and a first fan 1022.

[0058] The heating outdoor unit 103 comprises an outdoor evaporator 1031 and a second fan 1032.

[0059] The shell 101 is provided with a fan fixing plate 104 with ventilation holes, the first fan 1022 is fixed on the fan fixing plate 104, and the air blowing side of the outdoor condenser 1021 faces the air blowing side of the outdoor evaporator 1031.

[0060] It can be understood that the first fan 1022 is different from natural convection cooling, which does not utilize the natural flow of surrounding air through the outer surface of the condenser to dissipate the heat of the condenser, but is a forced convection method, which utilizes the fan to force air to flow through the outer surface of the condenser to dissipate the heat of the condenser.

[0061] The second fan 1032 circulates the air, and when the air passes through the finned evaporator, the heat of the air is absorbed by the refrigerant in the evaporator, so the temperature of the air is lowered, and cold air is blown out. The blowing side of the refrigeration outdoor unit 102 faces the heating outdoor unit 103, the blowing side of the heating outdoor unit 103 faces the refrigeration outdoor unit 102, the first fan 1022 is fixed on the fan fixing plate 104, and the blowing side of the outdoor condenser 1021 faces the blowing side of the outdoor evaporator 1031. The second fan 1022 is fixed on the fan fixing plate 104, and the blowing side of the outdoor evaporator 1031 faces the blowing side of the outdoor condenser 1021. Further, the cold air passing through the evaporator is sent to the condenser, and the hot air passing through the condenser is sent to the evaporator, thereby improving the energy efficiency of the entire machine and reducing the energy consumption of the entire machine.

[0062] Further, referring to Figure 2 and Figure 3 , the shell 101 is also provided with a partition plate 105 perpendicular to the fan fixing plate 104;

[0063] The first fan 1022 and the second fan 1032 are respectively arranged on the left and right sides of the partition plate 105.

[0064] It can be understood that under the action of the second fan 1032, the outdoor air passing through the outdoor condenser 1021 is heated, and then passing through the outdoor evaporator 1031 can improve the evaporation temperature; under the action of the first fan 1022, the outdoor air passing through the outdoor evaporator 1031 is cooled, and then passing through the outdoor condenser 1021 can reduce the condensation temperature. The higher the evaporation temperature and the lower the condensation temperature, the higher the energy efficiency of the unit; and the higher the energy efficiency, the speed of the first fan 1022 and the second fan 1032 can be appropriately reduced, and the energy consumption can be reduced.

[0065] Although the positions of the first fan 1022 and the second fan 1032 can ensure that the cold air passing through the evaporator is sent to the condenser and the hot air passing through the condenser is sent to the evaporator, when the first fan 1022 and the second fan 1032 work at the same time, the air on both sides blows to each other at the same time, which can offset a part of the expected result. Therefore, the technical solution provided by the embodiment adds the partition plate 105 perpendicular to the fan fixing plate 104, and the first fan 1022 and the second fan 1032 are respectively arranged on the left and right sides of the partition plate 105, so that the air duct of the first fan 1022 and the air duct of the second fan 1032 are isolated from each other, and the blowing effect of the two will not interfere with each other, thereby further improving the condensation efficiency and the evaporation efficiency.

[0066] Optionally, the outer unit condenser 1021 is semicircular arc-shaped, and the outer unit evaporator 1031 is semicircular arc-shaped.

[0067] The outer unit condenser 1021 and the outer unit evaporator 1031 are symmetrically arranged on the upper and lower sides of the fan fixing plate 104 and are arranged in a circular shape; the partition plate 105 is located on the diameter of the circle and is perpendicular to the fan fixing plate 104, and the first fan 1022 and the second fan 1032 are symmetrically arranged on the left and right sides of the partition plate 105.

[0068] It should be noted that the “upper and lower sides” refer to the upper and lower sides relative to the fan fixing plate 104 when the four-pipe air conditioner outer unit is placed horizontally, the fan fixing plate 104 is placed horizontally, and the four-pipe air conditioner outer unit is viewed from above. Similarly, the “left and right sides” refer to the left and right sides relative to the partition plate 105 when the four-pipe air conditioner outer unit is placed horizontally, the fan fixing plate 104 is placed horizontally, and the four-pipe air conditioner outer unit is viewed from above.

[0069] It can be understood that the outer unit condenser 1021 and the outer unit evaporator 1031 are both semicircular arc-shaped, which on the one hand facilitates wind gathering, and on the other hand, due to the fact that the circular area is the largest under the same circumference, it can ensure that the space surrounded by the two is the largest, and the air ducts of the first fan 1022 and the second fan 1032 are long enough to ensure the evaporation effect and the condensation effect. The first fan 1022 and the second fan 1032 are symmetrically arranged on the left and right sides of the partition plate 105, which can ensure that the air duct area of the first fan 1022 and the air duct area of the second fan 1032 are the same, and ensure that when cooling and heating are required at the same time, the cooling effect and the heating effect are balanced, and the system load is balanced.

[0070] Preferably, referring to Figure 3 , two ventilation holes are formed in the fan fixing plate 104, including a first ventilation hole and a second ventilation hole; the first ventilation hole and the second ventilation hole are respectively arranged on the left and right sides of the partition plate 105; the first fan 1022 is arranged in the first ventilation hole through a fixing frame;

[0071] The second fan 1032 is arranged in the second ventilation hole through a fixing frame.

[0072] It can be understood that the first fan 1022 is arranged in the first air vent through the fixing frame, and the second fan 1032 is arranged in the second air vent through the fixing frame, so that the air speed at the air vent is the maximum, the air in the space separated by the partition plate 105 and the fan fixing plate 104 can flow quickly, and the evaporation efficiency and the condensation efficiency are ensured. In addition, the first fan 1022 and the second fan 1032 need to be installed and drilled, and the first fan 1022 is arranged in the first air vent through the fixing frame, and the second fan 1032 is arranged in the second air vent through the fixing frame, so that the drilling process is omitted, and the product structure is simplified.

[0073] Further, the refrigeration outdoor unit 102 further comprises a first compressor 1023 connected with the outdoor condenser 1021;

[0074] The heating outdoor unit 103 further comprises a second compressor 1033 connected with the outdoor evaporator 1031;

[0075] The first compressor 1023 is arranged in the space between the suction air side of the outdoor condenser 1021 and the shell 101; and the second compressor 1033 is arranged in the space between the suction air side of the outdoor evaporator 1031 and the shell 101.

[0076] It can be understood that the first compressor 1023 and the second compressor 1033 are arranged outside the outdoor condenser 1021 and the outdoor evaporator 1031, which can facilitate the layout of the communication pipeline between the compressor and the indoor unit, and can reduce the influence on the condensation effect of the outdoor condenser 1021 and the evaporation effect of the outdoor evaporator 1031, so that the four-pipe air conditioner outdoor unit provided in the embodiment has a compact structure and strong anti-interference ability.

[0077] In summary, the technical scheme provided in the embodiment integrates the refrigeration outdoor unit and the heating outdoor unit of the four-pipe air conditioner outdoor unit together to assemble an outdoor unit, which is smaller in size and saves the occupied space compared with the two outdoor units independently running in the prior art. In addition, since the blowing-out air side of the refrigeration outdoor unit faces the heating outdoor unit, and the blowing-out air side of the heating outdoor unit faces the refrigeration outdoor unit, the cold air passing through the evaporator is sent to the condenser, the condensation efficiency is improved, the hot air passing through the condenser is sent to the evaporator, the evaporation efficiency is improved, and thus the energy efficiency of the whole machine is improved, and the energy consumption of the whole machine is reduced.

[0078] Embodiment two

[0079] Figure 2 is a circuit schematic diagram of a four-pipe air conditioner unit according to an exemplary embodiment, as shown in Figure 2 The four-pipe air conditioner unit comprises:

[0080] At least one air conditioner indoor unit 200, and the four-tube air conditioner outdoor unit 100.

[0081] It should be noted that the technical scheme provided in the embodiment only improves the structure of the four-tube air conditioner outdoor unit 100, and the structure of the air conditioner indoor unit 200 can directly reuse the structure of the air conditioner indoor unit in the prior art.

[0082] For example, referring to Figure 1 The structures of the air conditioner indoor units are the same, and each includes:

[0083] The indoor unit evaporator 201 is in communication with the refrigeration outdoor unit 102 of the four-tube air conditioner outdoor unit 100, and a first electronic expansion valve 107 for controlling the flow of refrigerant is arranged on the pipeline in communication.

[0084] The indoor unit condenser 202 is in communication with the heating outdoor unit 103 of the four-tube air conditioner outdoor unit 100, and a second electronic expansion valve 106 for controlling the flow of refrigerant is arranged on the pipeline in communication.

[0085] It can be understood that the technical scheme provided in the embodiment, because it includes the four-tube air conditioner outdoor unit 100 described above, and the four-tube air conditioner outdoor unit 100 described above integrates the refrigeration outdoor unit and the heating outdoor unit of the four-tube air conditioner outdoor unit together to assemble into one outdoor unit, compared with the independent operation of two outdoor units in the prior art, reduces the size of the outdoor unit and saves the occupied space. In addition, because the blowing-out wind side of the refrigeration outdoor unit faces the heating outdoor unit, and the blowing-out wind side of the heating outdoor unit faces the refrigeration outdoor unit, the cold wind passing through the evaporator is sent to the condenser, the condensing efficiency is improved; the hot wind passing through the condenser is sent to the evaporator, the evaporating efficiency is improved, thereby improving the energy efficiency of the whole machine and reducing the energy consumption of the whole machine.

[0086] In addition, in order to facilitate understanding of the working principle of the four-tube air conditioner unit provided in the embodiment, the following is explained and described:

[0087] In the full or partial refrigeration mode of the indoor unit, the first compressor is controlled to be turned on, so that the refrigerant flows out from the first compressor, then flows through the outdoor unit condenser, the first electronic expansion valve, and the end indoor unit evaporator needing refrigeration, and then returns to the first compressor.

[0088] In the full or partial heating mode of the indoor unit, the second compressor is controlled to be turned on, so that the refrigerant flows out from the second compressor, then flows through the end indoor unit condenser needing refrigeration, the second electronic expansion valve, and the outdoor unit evaporator, and then returns to the second compressor.

[0089] In the partial refrigeration mode and the partial heating mode of the indoor unit, the first compressor and the second compressor are simultaneously turned on, and operate in the full or partial refrigeration mode of the indoor unit and the full or partial heating mode of the indoor unit.

[0090] In the indoor unit part refrigeration mode and part heating mode, the outdoor unit operates in the refrigeration and heating simultaneous operation mode, which can significantly improve the energy efficiency of the unit and reduce the energy consumption (reduce the fan air volume and reduce the fan speed). The specific implementation is as follows:

[0091] Under the action of the second fan, the heat exchange of the outdoor unit evaporator is strengthened by the outdoor unit condenser: the temperature of the outdoor air is increased after passing through the outdoor unit condenser, and then passing through the outdoor unit evaporator, the evaporation temperature can be increased; under the action of the first fan, the heat exchange of the outdoor unit condenser is strengthened by the outdoor unit evaporator: the temperature of the outdoor air is reduced after passing through the outdoor unit evaporator, and then passing through the outdoor unit condenser, the condensation temperature can be reduced. The higher the evaporation temperature and the lower the condensation temperature, the higher the energy efficiency of the unit; and the energy efficiency is improved, the speed of the first fan and the second fan can be appropriately reduced, and the energy consumption is reduced.

[0092] In order to verify the reliability and effectiveness of the technical scheme provided in the embodiment in reducing energy consumption and improving energy efficiency, the applicant has carried out experimental verification, as follows:

[0093] I. When the heat exchange of the outdoor unit evaporator is strengthened by the outdoor unit condenser (see FIGS. 1 and 2): Figure 4 and Figures 5A-5D shown):

[0094] The technical scheme provided in the embodiment (in the following example, the first stage is the stage of air passing through the condenser, and the second stage is the stage of air passing through the evaporator, so it is divided into two stages), wherein,

[0095] t c1 represents the condenser refrigerant inlet temperature;

[0096] t c2 represents the condenser refrigerant outlet temperature;

[0097] t e1 represents the evaporator refrigerant inlet temperature;

[0098] t e2 represents the evaporator refrigerant outlet temperature;

[0099] t r1 represents the outdoor air temperature;

[0100] t r2 represents the temperature of the outdoor air after passing through the evaporator / condenser in the first stage;

[0101] t s represents the temperature of the outdoor air after passing through the evaporator / condenser in the second stage;

[0102] △t represents the logarithmic mean temperature difference.

[0103] Figure 5AThe temperature of the refrigerant entering the condenser is t c1 , the temperature of the refrigerant leaving the condenser is t c2 , the temperature of the outdoor air is t r1 , the temperature of the outdoor air after passing through the evaporator in the first stage is t r2 , Figure 5A The upper curve in FIG. 8 shows the temperature variation of the refrigerant entering and leaving the condenser of the outdoor unit. Figure 5A The lower curve in FIG. 8 shows the temperature variation of the outdoor air passing through the evaporator of the outdoor unit.

[0104] Figure 5B The temperature of the outdoor air after passing through the evaporator in the first stage is t r2 , the temperature of the outdoor air after passing through the evaporator in the second stage is t s , the temperature of the refrigerant entering the evaporator is t e1 , the temperature of the refrigerant leaving the evaporator is t e2 , Figure 5B The upper curve in FIG. 9 shows the temperature variation of the outdoor air after passing through the evaporator in the first stage and after passing through the evaporator in the second stage. Figure 5B The lower curve in FIG. 9 shows the temperature variation of the refrigerant passing through the evaporator.

[0105] Figure 5C The temperature of the refrigerant entering the condenser is t c1 , the temperature of the refrigerant leaving the condenser is t c2 , the temperature of the outdoor air is t r1 , the temperature of the outdoor air after passing through the evaporator in the first stage is t r2 Figure 5C The upper curve in FIG. 10 shows the temperature variation of the refrigerant entering and leaving the condenser of the outdoor unit. Figure 5C The lower curve in FIG. 10 shows the temperature variation of the outdoor air passing through the evaporator of the outdoor unit.

[0106] Figure 5D The temperature of the outdoor air after passing through the evaporator in the first stage is t r2 , the temperature of the outdoor air after passing through the evaporator in the second stage is t s , the temperature of the refrigerant entering the evaporator is t e1 , the temperature of the refrigerant leaving the evaporator is t e2 , Figure 5D The upper curve in FIG. 11 shows the temperature variation of the outdoor air after passing through the evaporator in the first stage and after passing through the evaporator in the second stage. Figure 5DThe middle lower curve represents the temperature change curve of the refrigerant through the outdoor unit evaporator.

[0107] First stage:

[0108]

[0109]

[0110] Second stage:

[0111]

[0112]

[0113] Prior art solution: when the refrigerant temperature drop in the condenser is a constant value under the effect of structural design,

[0114]

[0115]

[0116] Compared with the prior art, the technical solution provided by the embodiment can save the fan air volume of the outdoor unit through heat exchange:

[0117] When the flow is in the same direction: When the flow is in the opposite direction:

[0118] II. When the outdoor unit evaporator strengthens the heat exchange of the outdoor unit condenser (see Figure 4 and Figures 6A-6D ):

[0119] The technical solution provided by the embodiment:

[0120] Figure 6A When the outdoor unit evaporator strengthens the heat exchange of the outdoor unit condenser, the temperature of the outdoor air after passing through the condenser in the first stage is t r2 , the outdoor air temperature is t r1 , the refrigerant inlet temperature of the evaporator is t e1 , and the refrigerant outlet temperature of the evaporator is t e2 , Figure 6A The middle upper curve represents the temperature change curve of the outdoor air passing through the outdoor unit condenser in the first stage; Figure 6A The middle lower curve represents the temperature change curve of the refrigerant through the outdoor unit evaporator.

[0121] Figure 6B When the outdoor unit evaporator strengthens the heat exchange of the outdoor unit condenser, the temperature of the outdoor air after passing through the condenser in the first stage is t r2 , and the temperature of the outdoor air after passing through the condenser in the second stage is ts The temperature of the refrigerant entering the condenser is t. c1 The temperature exiting the condenser is t. c2 , Figure 6B The curve at the top represents the temperature change curve of the refrigerant as it passes through the outdoor unit's condenser; Figure 6B The curve at the top represents the temperature change curve of outdoor air after passing through the outdoor unit's condenser in the first stage and the second stage.

[0122] Figure 6C When the evaporator of the indoor unit enhances the heat exchange of the outdoor unit condenser, during the first stage of counter-current flow, the temperature of the outdoor air after passing through the condenser in the first stage is t. r2 The outdoor air temperature is t r1 The refrigerant inlet temperature in the evaporator is t e1 The temperature of the refrigerant exiting the evaporator is t. e2 , Figure 6C The curve at the top represents the temperature change of outdoor air as it passes through the outdoor unit's condenser in the first stage. Figure 6C The curve at the bottom represents the temperature change curve of the refrigerant as it passes through the outdoor unit's evaporator.

[0123] Figure 6D When the evaporator of the indoor unit enhances the heat exchange of the outdoor unit condenser, during the second stage of counter-current flow, the temperature of the outdoor air after passing through the condenser in the first stage is t. r2 The temperature of the outdoor air after passing through the condenser in the second stage is t. s The temperature of the refrigerant entering the condenser is t. c1 The temperature exiting the condenser is t. c2 , Figure 6B The curve at the top represents the temperature change curve of the refrigerant as it passes through the outdoor unit's condenser; Figure 6B The curve at the top represents the temperature change curve of outdoor air after passing through the outdoor unit's condenser in the first stage and the second stage.

[0124] Phase 1:

[0125]

[0126]

[0127] Phase Two:

[0128]

[0129]

[0130] Existing technical solutions: When the refrigerant temperature drop in the condenser is constant due to structural design,

[0131]

[0132]

[0133] Compared with the prior art, the technical scheme provided by the embodiment can save fan air volume through heat exchange

[0134] For the sake of understanding, the following examples are given with reference to Table 1 and Table 2, for example:

[0135]

[0136] Table 1

[0137]

[0138]

[0139] Table 2

[0140] Taking the case of strengthening the heat exchange of the outdoor unit evaporator by the outdoor unit condenser:

[0141] First stage:

[0142]

[0143]

[0144] Second stage:

[0145]

[0146]

[0147] When the refrigerant temperature drop of the condenser is a constant value under the effect of structural design, the prior art:

[0148]

[0149]

[0150] Compared with the prior art, the technical scheme provided by the embodiment can save fan air volume through heat exchange:

[0151] When the flow is in the same direction: When the flow is in the opposite direction: Taking the case of strengthening the heat exchange of the outdoor unit evaporator by the outdoor unit condenser:

[0152] First stage:

[0153]

[0154]

[0155] Second stage:

[0156]

[0157]

[0158] When the refrigerant temperature drop of the condenser is a constant value under the effect of structural design, the prior art:

[0159]

[0160]

[0161] Compared with the prior art, the technical scheme provided by the embodiment can save the fan air volume of the outdoor unit through heat exchange:

[0162] When the air flows in the same direction:

[0163] When the air flows in the opposite direction:

[0164] Obviously, the above experimental results verify that, under the effect of the second fan, the outdoor unit condenser strengthens the heat exchange of the outdoor unit evaporator: the outdoor air temperature is raised after passing through the outdoor unit condenser, and then passing through the outdoor unit evaporator, which can increase the evaporation temperature; under the effect of the first fan, the outdoor unit evaporator strengthens the heat exchange of the outdoor unit condenser: the outdoor air temperature is lowered after passing through the outdoor unit evaporator, and then passing through the outdoor unit condenser, which can lower the condensation temperature. The higher the evaporation temperature and the lower the condensation temperature, the higher the energy efficiency of the unit; and the increase in energy efficiency can appropriately reduce the rotation speed of the first fan and the second fan, thereby reducing energy consumption.

[0165] Embodiment three

[0166] According to the control method of the four-pipe air conditioning unit shown in an example embodiment, applied to the four-pipe air conditioning unit described above, comprising:

[0167] In the all-or-part refrigeration mode of the indoor unit, the first compressor is controlled to be turned on, so that the refrigerant flows out from the first compressor, then passes through the outdoor unit condenser, the first electronic expansion valve, and the end indoor unit evaporator that needs to be refrigerated, and then returns to the first compressor;

[0168] In the all-or-part heating mode of the indoor unit, the second compressor is controlled to be turned on, so that the refrigerant flows out from the second compressor, then passes through the end indoor unit condenser that needs to be refrigerated, the second electronic expansion valve, and the outdoor unit evaporator, and then returns to the second compressor;

[0169] The first compressor and the second compressor are started simultaneously in the partial refrigeration mode and the partial heating mode of the indoor unit, and the indoor unit is operated in the full or partial refrigeration mode and the full or partial heating mode.

[0170] It can be understood that the technical scheme provided by the embodiment is applied to the four-pipe air conditioning unit, and the four-pipe air conditioning unit is assembled into one outdoor unit by integrating the refrigeration outdoor unit and the heating outdoor unit of the four-pipe air conditioning outdoor unit. Compared with the two outdoor units operating independently in the prior art, the size of the outdoor unit is reduced, and the occupied space is saved. In addition, the cold air passing through the evaporator is sent to the condenser, and the hot air passing through the condenser is sent to the evaporator, so that the condensing efficiency is improved, the evaporating efficiency is improved, the energy efficiency of the whole machine is improved, and the energy consumption of the whole machine is reduced.

[0171] Of course, those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by a computer program instructing related hardware (such as a processor, a controller, etc.). The program can be stored in a computer-readable storage medium, and the program can include the processes of the above-mentioned method embodiments when executed. The storage medium can be a memory, a magnetic disc, an optical disc, etc.

[0172] The specific embodiments of the application described above do not constitute a limitation on the scope of protection of the application. Any other corresponding changes and modifications made according to the technical concept of the application should be included in the scope of protection of the claims of the application.

Claims

1. A four-pipe air conditioning outdoor unit, characterized by comprising: The application relates to a four-pipe air conditioner, which comprises a shell, a refrigeration outdoor unit and a heating outdoor unit arranged in the shell, wherein the suction air side of the refrigeration outdoor unit faces the shell, and the air blowing side faces the heating outdoor unit; the suction air side of the heating outdoor unit faces the shell, and the air blowing side faces the refrigeration outdoor unit; the refrigeration outdoor unit comprises an outdoor unit condenser and a first fan; the heating outdoor unit comprises an outdoor unit evaporator and a second fan; a fan fixing plate with air vents is arranged in the shell, the first fan is fixed on the fan fixing plate, and the air outlet surface of the first fan faces the air blowing side of the outdoor unit condenser; the second fan is fixed on the fan fixing plate, and the air outlet surface of the second fan faces the air blowing side of the outdoor unit evaporator; a partition plate perpendicular to the fan fixing plate is further arranged in the shell; the first fan and the second fan are arranged on the left and right sides of the partition plate respectively; the refrigeration outdoor unit further comprises a first compressor connected with the outdoor unit condenser; the heating outdoor unit further comprises a second compressor connected with the outdoor unit evaporator; the first compressor is arranged in the space between the suction air side of the outdoor unit condenser and the shell; and the second compressor is arranged in the space between the suction air side of the outdoor unit evaporator and the shell.

2. The four-pipe air conditioner according to claim 1, wherein the outdoor unit condenser is in a semicircular arc shape, and the outdoor unit evaporator is in a semicircular arc shape; the outdoor unit condenser and the outdoor unit evaporator are symmetrically arranged on the upper and lower sides of the fan fixing plate and are arranged in a circular shape; the partition plate is located on the diameter of the circular shape and is perpendicular to the fan fixing plate; and the first fan and the second fan are symmetrically arranged on the left and right sides of the partition plate.

3. The four-pipe air conditioner according to claim 1, wherein two air vents are arranged on the fan fixing plate, including a first air vent and a second air vent; the first air vent and the second air vent are arranged on the left and right sides of the partition plate respectively; the first fan is arranged in the first air vent through a fixing frame; and the second fan is arranged in the second air vent through a fixing frame.

4. The four-pipe air conditioner according to claim 1, wherein a plurality of air vents are arranged on the shell.

5. The four-pipe air conditioner according to claim 4, wherein the cross section of the shell is a square or a rectangle; and / or the refrigeration outdoor unit and the heating outdoor unit are both arranged in the shell without contact and are fixed in the shell through a connecting piece. The application further relates to a four-pipe air conditioner system, which comprises at least one air conditioner indoor unit and the four-pipe air conditioner according to any one of claims 1 to 5; the air conditioner indoor units are the same in structure and comprise an indoor unit evaporator connected with the refrigeration outdoor unit of the four-pipe air conditioner and a first electronic expansion valve arranged on the pipeline connected with the refrigeration outdoor unit for controlling the refrigerant flow; and an indoor unit condenser connected with the heating outdoor unit of the four-pipe air conditioner and a second electronic expansion valve arranged on the pipeline connected with the heating outdoor unit for controlling the refrigerant flow. The application further relates to a four-pipe air conditioner system, which comprises at least one air conditioner indoor unit and the four-pipe air conditioner according to any one of claims 1 to 5; the air conditioner indoor units are the same in structure and comprise an indoor unit evaporator connected with the refrigeration outdoor unit of the four-pipe air conditioner and a first electronic expansion valve arranged on the pipeline connected with the refrigeration outdoor unit for controlling the refrigerant flow; and an indoor unit condenser connected with the heating outdoor unit of the four-pipe air conditioner and a second electronic expansion valve arranged on the pipeline connected with the heating outdoor unit for controlling the refrigerant flow. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 6. A four circuit air conditioning unit characterized by, ​ ​ 7. The four-temperature-zone air conditioning pack of claim 6, wherein ​ ​ ​ 8. A control method of a four-wire air conditioning unit, applied to the four-wire air conditioning unit of claim 7, characterized in that, ​ In the all or part refrigeration mode of the indoor unit, the first compressor is controlled to be turned on, so that the refrigerant flows out from the first compressor, sequentially passes through the outdoor unit condenser, the first electronic expansion valve, the end indoor unit evaporator requiring refrigeration, and then returns to the first compressor; In the all or part heating mode of the indoor unit, the second compressor is controlled to be turned on, so that the refrigerant flows out from the second compressor, sequentially passes through the end indoor unit condenser requiring refrigeration, the second electronic expansion valve, the outdoor unit evaporator, and then returns to the second compressor; In the part refrigeration mode and the part heating mode of the indoor unit, the first compressor and the second compressor are simultaneously turned on, and the operation is according to the all or part refrigeration mode of the indoor unit and the all or part heating mode of the indoor unit.

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