Finned tube heat exchanger assembly, and double refrigeration system air conditioner main machine and equipment platform with multiple negative pressure cavities arranged along long edges

Abstract

The present application belongs to the field of high-efficiency energy-saving air conditioning technology and green building, and discloses a finned tube heat exchanger assembly, a double refrigeration system air conditioner main unit with multiple negative pressure chambers arranged along the long side, and an equipment platform. The finned tube heat exchanger assembly comprises at least two finned tube heat exchangers, which include horizontal C-shaped finned tube heat exchangers, horizontal "mouth"-shaped finned tube heat exchangers, and / or vertical V-shaped finned tube heat exchangers. The air conditioner main unit comprises the finned tube heat exchanger assembly, a shell, an air conditioner compressor, a gas-liquid separator, and a fan; the finned tube heat exchangers of the finned tube heat exchanger assembly are respectively connected with different air conditioner compressors. The air conditioner main unit equipment platform is provided with at least one air conditioner main unit arranged in the transverse direction in the equipment platform. The present application constructs a flexible and efficient heat exchange air path structure of the air conditioner main unit, facilitates the detection and maintenance of the air conditioner main unit, and creates conditions for constructing a side-in and side-out air path structure in cooperation with the outer facade of the equipment platform.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of high-efficiency energy-saving air conditioning technology and green building, and more particularly relates to a finned tube heat exchanger assembly, a double refrigeration system air conditioning main unit with multiple negative pressure chambers arranged along the long side, and an equipment platform. BACKGROUND

[0002] The multi-split commercial central air conditioning main unit used in high-rise or super high-rise buildings is usually arranged in an equipment platform of the outer corridor type to efficiently and intensively utilize the equipment platform space and air energy resources, reduce the construction cost of the equipment platform, and realize efficient utilization of energy resources.

[0003] The prior art double refrigeration type air conditioner (CN112880246A) discloses a refrigerant heat exchange system and two adsorption refrigeration systems. The refrigerant heat exchange system includes two indoor heat exchangers and two outdoor heat exchangers, and the two indoor heat exchangers are respectively provided with indoor parallel pipelines, and the two outdoor heat exchangers are respectively provided with outdoor parallel pipelines. Each adsorption refrigeration system includes an evaporation part arranged at the indoor heat exchanger and an adsorption part arranged at the outdoor heat exchanger, and an adsorption medium conveying flow path is formed between the evaporation part and the adsorption part.

[0004] The existing widely used multi-split air conditioning main unit, air-cooled water chiller module, and the like "upward air outlet" air conditioning main unit, as well as the relationship between the main unit and the building structure, are still "two skins", the air conditioning main unit is still the original air conditioning main unit, and the equipment platform is still the traditional outer corridor type structure space. Only the spatial displacement of the air conditioning main unit is implemented, neither of them adapts to the structural relationship requirements of the building distributed energy system, and presents a series of problems such as poor air flow of the air conditioning main unit, reduced energy efficiency of the refrigeration system, excessive land occupation of the air inlet and air outlet channels, unreasonable use of the equipment platform space, reduced power density, and increased land occupation of the main unit.

[0005] The structural relationship between the existing multi-split air conditioning main unit, air-cooled water chiller module, and the like "upward air outlet" commercial central air conditioning main unit and the outer corridor type equipment platform still has many technical problems, including:

[0006] First, the energy density of the air conditioning main unit equipment platform is low. After multiple structural optimizations and energy efficiency improvements, the power density of the existing air conditioning main unit calculated according to the land occupation area of the main unit itself is more than 40kw / ㎡, while the power density of the existing air conditioning main unit equipment platform is only 11.6kw / ㎡, that is, the land occupation area of the air conditioning main unit equipment platform, including the air inlet and outlet channels, maintenance channels, and ventilation blind areas, is more than 2.4 times the land occupation area of the air conditioning main unit itself. The land occupation area of the existing air conditioning main unit equipment platform is too large, generally accounting for more than 1.5% of the total building area, which has become a prominent problem in the design of building heating, ventilation, and air conditioning.

[0007] Second, the equipment platform occupies the transverse width of the building facade. The current air conditioner host and equipment platform have unreasonable inlet and outlet field structure, low utilization rate of longitudinal space and top space, which leads to the transverse width of the building facade being occupied by the air conditioner host inlet and outlet. The width of the building facade is an important resource in the building index system, and the air conditioner host equipment platform competes for the width of the building facade in high-rise and super high-rise buildings, which leads to the transverse width of the building facade being occupied and the visual communication between the internal space of the building and the external environment being blocked, which has become a prominent problem in building HVAC design.

[0008] Third, the rated power of the air conditioner host is large and the output flexibility is small. The rated power of the air conditioner host for cooling and heating is very large, which is in the order of tens of kilowatts, hundreds of kilowatts or even thousands of kilowatts. Although the frequency conversion technology provides the possibility of adjusting the load output of the air conditioner host, if the frequency conversion technology is used to adjust the power output of the air conditioner host, the COP of the air conditioner host will be greatly reduced at low load rate. How to reduce the rated capacity of the unit host and stabilize the COP of the refrigeration air conditioning system at low load and low load rate is also an important problem in building HVAC design. SUMMARY

[0009] To solve the above-mentioned problems of the prior art, the present application provides a finned tube heat exchanger assembly.

[0010] Another object of the present application is to provide a double refrigeration system air conditioner host with multiple negative pressure chambers arranged along the long side.

[0011] Another object of the present application is to provide an air conditioner host equipment platform.

[0012] To solve the above-mentioned problems, the technical solution of the present application is as follows:

[0013] A finned tube heat exchanger assembly, comprising at least two finned tube heat exchangers, wherein the finned tube heat exchanger comprises a horizontal C-shaped finned tube heat exchanger, a horizontal "mouth"-shaped finned tube heat exchanger and / or a vertical V-shaped finned tube heat exchanger.

[0014] A double refrigeration system air conditioner host with multiple negative pressure chambers arranged along the long side, comprising the finned tube heat exchanger assembly, a shell, an air conditioner compressor, a gas-liquid separator and a fan; the at least two finned tube heat exchangers of the finned tube heat exchanger assembly are respectively connected with different refrigeration air conditioning system compressors.

[0015] At least two groups of gas-liquid separators, air conditioner compressors, four-way valves, heat exchanger assemblies, expansion valves and refrigerant pipelines of air conditioner indoor units are sequentially communicated to build at least two groups of refrigerant circulation loops of air conditioning systems and form at least two independent air conditioner unit hosts.

[0016] Further, at least two finned tube heat exchangers are arranged in the shell along the length direction;

[0017] The transverse width of the front finned tube heat exchanger near the air inlet is less than or equal to the transverse width of the rear finned tube heat exchanger.

[0018] Further, the bottom of the shell is provided with a raised support for mounting the finned tube heat exchanger;

[0019] The space below the front finned tube heat exchanger in the shell expanded by the raised support constitutes an air inlet channel at the bottom of the air conditioner main unit.

[0020] Further, the front finned tube heat exchanger is a vertical V-shaped finned tube heat exchanger, a horizontal "mouth"-shaped finned tube heat exchanger or a horizontal C-shaped finned tube heat exchanger; the rear finned tube heat exchanger is a horizontal C-shaped finned tube heat exchanger.

[0021] Further, the air conditioner compressor and the gas-liquid separator are arranged at the bottom of the negative pressure cavity of the rear finned tube heat exchanger or in the lower space outside the negative pressure cavity.

[0022] Further, a fan is arranged at the top of the negative pressure cavity of the finned tube heat exchanger; an air outlet cavity connected with the shell is arranged above the fan; preferably, the air outlet of the air outlet cavity faces the short side of the shell of the air conditioner main unit.

[0023] Further, the fan is an axial fan or a centrifugal fan; the compressor is a fixed-frequency compressor or a variable-frequency compressor.

[0024] An air conditioner main unit equipment platform, at least one air conditioner main unit is arranged in the equipment platform along the transverse direction; the equipment platform is provided with an external facade for ventilation, and the air inlet and air distribution channel of the air conditioner main unit is close to the external facade; an air outlet cavity is arranged above the air conditioner main unit, and the air outlet of the air outlet cavity is arranged and / or close to the external facade.

[0025] Further, the air outlet area on the external facade corresponds to the air outlet of the air conditioner main unit, and the air inlet area on the external facade corresponds to the air inlet of the air conditioner main unit.

[0026] Further, the air outlet area on the external facade is continuously arranged at the upper part of the external facade, and the air inlet area on the external facade is continuously arranged at the middle and lower part of the external facade.

[0027] Preferably, the boundary between the air outlet area of the external facade and the air inlet area of the external facade is a horizontal straight line or close to a horizontal straight line.

[0028] Further, the area of the air outlet area on the external facade is 25% to 50% of the area of the external facade for ventilation.

[0029] Further, the back plate of the air conditioner host and the inner wall of the equipment platform form a three-in-one channel for people, maintenance and setting up copper pipes and cable trays of the air conditioning system.

[0030] Compared with the prior art, the air conditioner host has the following beneficial effects:

[0031] The air conditioner host of the present application adopts the finned tube heat exchanger negative pressure cavity and the side-in side-out and same-side-in and out external heat exchanger air path structure, which creates conditions for the air conditioner host to enter the equipment platform and greatly improves the energy density of the equipment platform, and its beneficial effects include:

[0032] ① Constructing flexible and efficient heat exchange air path structure of air conditioner host

[0033] The air conditioner host of the present application adopts the short side middle and lower part medium speed air inlet and the top high speed air outlet aerodynamic layout, and the main part of the air inlet channel and the air outlet channel of the finned tube heat exchanger assembly is included in the host body. The finned tube heat exchanger is used as the basic unit of the heat exchanger to construct the finned tube heat exchanger assembly of the air conditioner host. In the limited space of the air conditioner host, the finned tube heat exchanger is arranged, and a large area of heat exchanger ventilation surface is developed along the fin group air inlet surface of the finned tube heat exchanger. A huge area of fin heat transfer surface is further developed on the large area of heat exchanger ventilation surface, thereby effectively expanding the total fin and heat exchange area S of the finned tube heat exchanger assembly of the air conditioner host, reducing the heat transfer temperature difference of the heat exchanger body, increasing the evaporation pressure and reducing the condensation pressure, and constructing a heavy load air conditioner host.

[0034] The heat exchanger negative pressure cavity arranged along the long side of the air conditioner host, the air inlet duct and the air outlet cavity communicating with the negative pressure cavity can independently operate corresponding to different refrigeration systems, and the air conditioner host has the characteristics of miniaturization and flexible operation.

[0035] In the chain process of medium speed air inlet of external heat exchanger air path flow → dispersion deceleration → heat exchange on huge heat exchanger fin area S → collection acceleration → fan pressure increase → high speed discharge, the air flow takes the fan as the power source, the negative pressure cavity as the core, and the huge amount of heat exchanger fins as the lowest speed area, completes one fan pressurization and two static pressure-dynamic pressure conversions before and after the fan, and has high efficiency and smoothness, thereby constructing the internal efficient heat exchange air path structure of the air conditioner host.

[0036] The external heat exchanger negative pressure cavity arranged along the long side of the air conditioner host provides a huge amount of heat exchange fins for the finned tube heat exchanger assembly of the air conditioner host, effectively controls the volume of the air conditioner host, improves the energy density of the air conditioner host, and prepares the precondition for improving the energy density of the equipment platform.

[0037] ② Facilitating detection and maintenance of air conditioner host

[0038] The present application sets up an outer heat exchanger negative pressure cavity along the long side, and sets up a plurality of fluorine circuit components such as refrigeration system compressor, gas-liquid separator, four-way valve, expansion valve and electrical box in the horizontal C-shaped finned tube heat exchanger negative pressure cavity, and sets up the ventilation blind area close to the middle lower part of the back plate in the horizontal C-shaped finned tube heat exchanger negative pressure cavity, and there is no fluorine movement structure in the horizontal C-shaped finned tube heat exchanger negative pressure cavity adjacent to the air inlet and outlet; and the back plate of the horizontal C-shaped finned tube heat exchanger negative pressure cavity is arranged on the short side of the main machine, and the back plate of the horizontal C-shaped finned tube heat exchanger negative pressure cavity faces the maintenance passage on the inside of the platform when installed on the equipment platform.

[0039] The possible faults of the air conditioner main machine are usually fluorine circuit movement structures such as compressor, four-way valve, expansion valve, electrical box and circuit components such as contactor, controller and sensor; the structural design of the air conditioner main machine of the present application facilitates inspection and maintenance: when a fault occurs, the back plate of the horizontal C-shaped finned tube heat exchanger negative pressure cavity is opened on the maintenance passage on the inside of the equipment platform, and the fluorine circuit components such as compressor, four-way valve, expansion valve and electrical box that may have faults are all in view, and the inspection and maintenance are very convenient, and the problem of difficult inspection and maintenance of the air conditioner main machine is solved.

[0040] ③It creates conditions for building side-in and side-out air path structure with the outer facade of the equipment platform

[0041] The classic top air outlet central air conditioner main machine is customized for the balcony scene on the roof; when moving from the balcony on the roof to the equipment platform in the middle layer of the building, the air path of the top air outlet air conditioner main machine needs to be innovated in combination with the outer facade of the platform.

[0042] In order to control the vertical unevenness of the ventilation of the outer heat exchanger, the height of the finned tube heat exchanger is limited to about 1.2m, the overall height of the main machine is limited to about 1.7m, and the net height of the equipment layer of the high-rise and super high-rise building where the central air conditioner main machine is installed reaches more than 4m, the present application establishes the aerodynamic layout of "medium-speed air inlet at the middle and lower part of the main machine, high-speed air outlet at the top of the air outlet cavity, the air inlet and outlet are arranged in the same direction and on the same side, and the air inlet area: air outlet area ≈ 2:1", sets up the "air outlet cavity" with an air outlet cross-sectional area of about 1 / 2 of the air inlet area at the top of the plurality of outer heat exchanger negative pressure cavities along the long side, and develops the idle space at the top of the equipment platform; the present application not only has compact structure, but also has the air conditioner main machine with the air inlet and outlet arranged in the same direction, on the same side and vertically, which prepares conditions for the air conditioner main machine to be arranged adjacent to the outer facade of the equipment platform and to build the side-in and side-out air path structure with the outer facade of the equipment platform;

[0043] The application is designed under the concept that the air outlet area is about 2 times of the air inlet area of the air conditioner main machine, the air outlet speed is 2 times of the air inlet speed, and the air outlet dynamic pressure head is 4 times of the air inlet dynamic pressure head, so that the speed and kinetic energy of the air outlet of the outer heat exchanger of the air conditioner main machine are effectively improved, and the range and diffusion dilution effect of the air outlet jet flow of the air conditioner main machine penetrating through the outer facade of the equipment platform into the ambient atmosphere are effectively improved.

[0044] ④The load elasticity of the air conditioning system is increased

[0045] The building distributed energy system requires that the air conditioning system has good output elasticity to meet various load demands.

[0046] The application is designed under the concept that the air outlet area is about 2 times of the air inlet area of the air conditioner main machine, the air outlet speed is 2 times of the air inlet speed, and the air outlet dynamic pressure head is 4 times of the air inlet dynamic pressure head, so that the speed and kinetic energy of the air outlet of the outer heat exchanger of the air conditioner main machine are effectively improved, and the range and diffusion dilution effect of the air outlet jet flow of the air conditioner main machine penetrating through the outer facade of the equipment platform into the ambient atmosphere are effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 A schematic diagram of the total temperature difference between the condensation temperature and the evaporation temperature of the refrigeration system caused by the cumulative heat transfer temperature difference of the condenser body, the high-temperature and low-temperature heat source temperature difference, and the evaporation temperature difference of the evaporator body of the air conditioning system;

[0048] Figure 2 A pressure-enthalpy diagram refrigeration cycle schematic diagram for the increase of the total fin heat exchange area of the outer heat exchanger of the refrigeration air conditioning system, the increase of the evaporation pressure, the increase of the heat absorption amount of unit mass refrigerant of the refrigeration system, the reduction of the compression work, the increase of the COP, the increase of the refrigerant circulation amount of the refrigeration system, the increase of the heat absorption amount of the evaporator, and the increase of the heat release amount of the condenser;

[0049] Figure 3 A structure schematic diagram of the C-shaped "mouth" type finned tube heat exchanger assembly of the double refrigeration system of Example 1;

[0050] Figure 4 A three-dimensional structure schematic diagram of the air conditioner main machine adopting the C-shaped "mouth" type finned tube heat exchanger assembly of the double refrigeration system of Example 1 (not containing the air outlet cavity);

[0051] Figure 5 A three-dimensional structure schematic diagram of the air conditioner main machine containing the air outlet cavity and adopting the C-shaped "mouth" type finned tube heat exchanger assembly of the double refrigeration system of Example 1;

[0052] Figure 6 A vertical sectional view of the air conditioner main machine of Example 1;

[0053] Figure 7 A three-dimensional structure schematic diagram of the air conditioner main machine containing the air outlet cavity and adopting the C-shaped "mouth" type finned tube heat exchanger assembly of the double refrigeration system of Example 1; Figure 6 three horizontal sectional views

[0054] Figure 8 The refrigeration system principle diagram of the double refrigeration system air conditioner host of Example 1;

[0055] Figure 9 The air flow diagram of the outer unit host independent operation of the double refrigeration system air conditioner host of Example 1;

[0056] Figure 10 The air flow diagram of the outer unit host independent operation of the double refrigeration system air conditioner host of Example 1;

[0057] Figure 11 The structure top view diagram of the double refrigeration system air conditioner host using two C-shaped finned tube heat exchangers of Example 2;

[0058] Figure 12 The three-dimensional structure diagram of the heat exchanger assembly of the double refrigeration system air conditioner host using horizontal C-shaped and vertical V-shaped finned tube heat exchangers of Example 3;

[0059] Figure 13 The three-dimensional structure diagram of the double refrigeration system air conditioner host using horizontal C-shaped and vertical V-shaped finned tube heat exchanger assembly of Example 3;

[0060] Figure 14 The air flow diagram of the double refrigeration system synchronous operation of the double refrigeration system air conditioner host using horizontal C-shaped and vertical V-shaped finned tube heat exchanger assembly of Example 3;

[0061] Figure 15 The vertical sectional view diagram of the equipment platform structure of the double refrigeration system air conditioner host of Example 4;

[0062] Figure 16 The air flow diagram of the equipment platform of the double refrigeration system air conditioner host of Example 4;

[0063] Figure 17 The relationship diagram of the air inlet area and the air exhaust area on the outer facade of the equipment platform. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments, all other embodiments obtained by those of ordinary skill in the art without any creative effort belong to the scope of protection of the present application.

[0065] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Unless otherwise defined, the technical terms or scientific terms used in the present application shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms "first", "second", and similar terms are not intended to denote any order, quantity, or importance, but are used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects listed before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connected" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0066] In the description of the present application, it should be understood that the terms "transverse", "longitudinal", "length", "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0067] Definition: Corridor equipment platform, set the direction perpendicular to the outer facade of the corridor equipment platform as longitudinal, the direction parallel to the outer facade of the corridor equipment platform as transverse.

[0068] The present application starts from thermodynamic fluid mechanics, innovates the performance optimization path of air conditioning main unit, the air inlet and outlet field structure of building equipment platform, and the energy coupling characteristics and improvement of air conditioning main unit and equipment platform.

[0069] Under the concept of building distributed energy system, the core goal of the optimization of the air conditioning main unit of the present application is to "reduce condensing pressure and improve evaporation pressure": because reducing the condensing pressure of refrigeration can directly reduce the compression power of the compressor; and increasing the evaporation pressure of air conditioning heat pump is to increase the density of low-pressure refrigerant gas sucked by the compressor, that is, to increase the refrigerant circulation, the heat absorption of the evaporator, the heat release of the condenser and to reduce the compression ratio and the exhaust temperature of the compressor; if the evaporation pressure of the outdoor heat exchanger (evaporator) of the heat pump air conditioning main unit in winter is increased from 5 kg to 6 kg, the refrigerant circulation, the heat absorption of the evaporator and the heat release of the condenser of the air conditioning heat pump system will definitely increase by about 20%, and the compression ratio and the exhaust temperature of the compressor will also decrease accordingly; the physical judgment that "evaporation pressure (evaporation temperature) is the first factor of refrigeration system" is the technical starting point and support for the continuous optimization of refrigeration air conditioning system.

[0070] The present application is committed to realizing the "reducing condensing pressure and improving evaporation pressure" of the refrigeration air conditioner host under the specific low temperature heat source and high temperature heat source scene. The present application obtains the technical path judgment that "the key to improving the evaporation pressure of the present air conditioner host, reducing the condensing pressure and improving the heat exchange capacity of the outer heat exchanger of the air conditioner host lies in increasing the total heat transfer area S" from the relationship formula Q=K×S×⊿T among the heat exchange capacity Q, the total heat transfer coefficient K, the heat exchange area S and the heat transfer temperature difference ⊿T between the refrigerant and air of the air conditioner evaporator, condenser and other finned tube heat exchangers.

[0071] As shown in Figure 1 , the difference (T2-t2) between the condensing temperature and the evaporation temperature is the fundamental factor determining the core indicator COP of the refrigeration air conditioning system. The higher the (T2-t2) is, the lower the COP is. The lower the (T2-t2) is, the higher the COP is. The COP of the refrigeration air conditioning system is inversely related to the difference (T2-t2) between the condensing temperature and the evaporation temperature. The difference (T2-t2) between the condensing temperature and the evaporation temperature is accumulated by the condenser body heat transfer temperature difference (T2-T1), the high temperature heat source and low temperature heat source temperature difference (T1-t1) and the evaporator body heat transfer temperature difference (t1-t2). Therefore, under the condition that the high temperature heat source and low temperature heat source temperature difference (T1-t1) exists objectively and cannot be changed, reducing the condenser body heat transfer temperature difference (T2-T1) and the evaporator body heat transfer temperature difference (t1-t2) is the only path to reduce the difference (T2-t2) between the condensing temperature and the evaporation temperature of the air conditioning heat pump system, to reduce the system condensing pressure (condensing temperature), to improve the system evaporation temperature (evaporation pressure), to improve the system refrigerant circulation quantity, to improve the evaporator heat absorption and the condenser heat release, and to improve the COP of the refrigeration air conditioning system.

[0072] In the present refrigeration air conditioning system evaporator, condenser and other finned tube heat exchangers, the wide application of corrugated fins, slotted fins and internally threaded copper pipes has made the total heat transfer coefficient K of the outer heat exchanger of the air conditioner host close to the peak value, and the marginal effect of continuing to optimize the K value has sharply decreased. If the low temperature medium (for example, indoor low temperature air in summer) between the evaporator fins and the refrigerant in the copper pipe is expanded under the specific low temperature heat source and high temperature heat source scene, that is, under the condition that the temperature and humidity of the high temperature medium and low temperature medium of the condenser and evaporator are determined, the evaporation temperature and evaporation pressure will inevitably be lowered. If the high temperature medium (for example, high temperature environment air in summer) between the condenser copper pipe and the refrigerant gas is expanded, the condensing pressure and condensing temperature will inevitably be raised. Therefore, expanding the heat transfer temperature difference ⊿T of the evaporator, condenser and other heat exchangers damages the refrigerant circulation quantity, heat absorption capacity, heat release capacity and COP of the entire refrigeration system.

[0073] Based on the above thermodynamic analysis, the air conditioner host of the application aims to expand the total heat transfer area S of the finned tube heat exchanger in the three factors K, S and T of the heat exchange amount Q of the air conditioner host outer heat exchanger, so as to reduce the body heat transfer temperature difference of the evaporator condenser, increase the evaporation pressure and reduce the condensation pressure, so as to realize the goal of increasing the refrigerant circulation amount, the evaporator heat absorption amount, the condenser heat release amount and the COP of the refrigeration system. The technical effect of expanding the total fin heat transfer area of the outer heat exchanger of the application is particularly embodied in the improvement of the evaporation temperature and the evaporation pressure of the evaporator.

[0074] As shown in Figure 2 , the application expands the total heat transfer area S of the finned tube heat exchanger to reduce the body heat transfer temperature difference of the evaporator condenser, improve the evaporation pressure and reduce the condensation pressure, so as to realize the goal of increasing the refrigerant circulation amount, the evaporator heat absorption amount, the condenser heat release amount and the COP of the refrigeration system. The technical effect of expanding the total fin heat transfer area of the outer heat exchanger of the application is particularly embodied in the improvement of the evaporation temperature and the evaporation pressure of the evaporator.

[0075] The evaporation pressure is the first factor of the heat pump system, and its influence on the performance of the refrigeration system heat pump system is as shown in Figure 2 (ordinate for condensation pressure, abscissa for enthalpy value, 1-2-3-4 in the figure is the original cycle path, and 1-2-3'-4' is the cycle path of the application):

[0076] (1) The increase of the evaporation pressure (P1→P1') directly leads to the increase of the unit mass refrigerant heat absorption amount (h4'-h4) and the decrease of the compressor compression work (h4'-h4) of the refrigeration system, and the energy efficiency ratio is improved;

[0077] (2) The increase of the evaporation pressure (P1→P1') also directly leads to the increase of the refrigerant circulation amount of the fixed frequency heat pump system by about (P1' / P1-1)×100%, and the increase of the evaporator heat absorption power and the condenser heat release power by about (P1' / P1-1)×100%;

[0078] (3) The increase of the evaporation pressure also directly leads to the decrease of the compression ratio and the decrease of the compressor discharge temperature, effectively inhibiting the deterioration of the lubricating oil and the degradation of the insulation performance of the compressor motor.

[0079] Example 1

[0080] As shown in Figures 3-10 , a double refrigeration system air conditioner host provided with multiple negative pressure cavities along the long side, comprising a finned tube heat exchanger assembly, a shell, an air conditioner compressor, a gas-liquid separator 126 and a fan 38;

[0081] The finned tube heat exchanger assembly comprises two finned tube heat exchangers 37, and the finned tube heat exchangers 37 are respectively horizontal C-shaped finned tube heat exchangers and horizontal "mouth"-shaped finned tube heat exchangers.

[0082] The two finned tube heat exchangers 37 are arranged along the long side direction in the shell.

[0083] Two finned tube heat exchangers 37 are connected with air conditioner compressor I 121, air conditioner compressor II 122, gas-liquid separator I 126, gas-liquid separator II, etc.

[0084] Two groups of gas-liquid separators, air conditioner compressors, four-way valves, heat exchanger assemblies, expansion valves and refrigerant pipelines of the air conditioner indoor unit are sequentially communicated to build at least two groups of air conditioner system refrigerant circulation loops to form two independent air conditioner unit main machines.

[0085] The finned tube heat exchanger 37 is provided with a fluorine path 134 and a lotus head gas collecting pipe 133.

[0086] The transverse width d of the front finned tube heat exchanger 371 close to the air inlet 125 is less than or equal to the transverse width of the rear finned tube heat exchanger 372.

[0087] The two sets of refrigeration systems of the embodiment can be simultaneously operated or independently operated.

[0088] The inner bottom of the shell is provided with a raised support 136 for mounting the finned tube heat exchanger 37;

[0089] The space expanded by the raised support 136 below the front finned tube heat exchanger 371 in the shell forms an air inlet passage 135 at the bottom of the air conditioner main machine.

[0090] The air conditioner compressor I 121, the air conditioner compressor II 122, the gas-liquid separator I 126, the gas-liquid separator II, etc. are arranged in the inner bottom of the negative pressure cavity 124 of the rear finned tube heat exchanger 372 or the lower space outside the negative pressure cavity 124.

[0091] A fan 38 is arranged at the top of the negative pressure cavity of each finned tube heat exchanger 37. An exhaust cavity 33 connected with the shell is arranged above the fan 38;

[0092] The exhaust port 331 of the exhaust cavity 33 faces the short side of the air conditioner main machine shell.

[0093] The fan 38 is an axial flow fan.

[0094] The air conditioner main machine of the embodiment is connected with the indoor heat exchanger 127 to form an air conditioner system.

[0095] The air conditioner main machine of the embodiment innovates the double refrigeration system air conditioner main machine from the aspects of expanding the total area of the ventilation cross section, the total fin area and reducing the heat transfer temperature difference of the external heat exchanger of the finned tube heat exchanger assembly of the multi-system air conditioner main machine, including:

[0096] ① Air conditioner main machine structure design innovation

[0097] The embodiment adopts horizontal C-shaped finned tube heat exchanger as the basic unit of finned tube heat exchanger assembly, constructs a double-fluorine path system air conditioner main unit finned tube heat exchanger assembly including at least two independent outer heat exchanger units, sets two horizontal C-shaped finned tube heat exchangers in the limited space of a multi-system air conditioner main unit, spreads a large-area heat exchanger ventilation surface along the fin group air inlet surface of the two finned tube heat exchangers, and further spreads a huge fin heat transfer surface on the large-area heat exchanger ventilation surface, thereby effectively expanding the fin total and heat exchange area S of the air conditioner main unit finned tube heat exchanger assembly, reducing the heat transfer temperature difference of the heat exchanger body, increasing the evaporation pressure and reducing the condensation pressure, and constructing a heavy-load air conditioner main unit.

[0098] The air conditioner main unit of the embodiment is provided with two outer heat exchanger negative pressure cavities along the long direction of the air conditioner main unit, one of which is horizontally arranged away from the air inlet and air outlet of the air conditioner main unit, that is, a rear finned tube heat exchanger, and the other is arranged close to the air inlet and air outlet of the air conditioner main unit on the heightening support, that is, a front finned tube heat exchanger. The main part of the air inlet and air outlet passages of the finned tube heat exchanger assembly is arranged inside the air conditioner main unit, and the fluorine path circuit components such as the compressor, four-way valve, expansion valve and electrical box of the air conditioner main unit are arranged in the negative pressure cavity of the rear finned tube heat exchanger.

[0099] ②Air conditioner main unit outer heat exchanger air inlet and outlet field design innovation

[0100] The air conditioner main unit of the embodiment is designed based on multiple outer heat exchanger negative pressure cavities.

[0101] The negative pressure cavities of the air conditioner main unit of the embodiment are each composed of a bottom plate, a side plate, a finned tube heat exchanger and a top plate. The top plate is provided with an air outlet of the heat exchanger negative pressure cavity, and a fan is arranged at the air outlet. The finned tube heat exchanger is an air inlet of the respective negative pressure cavity. An air outlet cavity is arranged above the top plate of the negative pressure cavity, and the air outlet of the air outlet cavity is arranged on the same side as the air inlet of the air conditioner main unit. The air inlets of multiple air outlet cavities are communicated with the air outlets of the fans of the heat exchanger negative pressure cavities.

[0102] The horizontal width of the rear finned tube heat exchanger of the embodiment is smaller than that of the front finned tube heat exchanger, so that the large-section horizontal air inlet passage of the finned tube heat exchanger assembly is constructed by the space outside the front finned tube heat exchanger and the space expanded by the heightening support below the bottom plate, and air is sequentially supplied to the front finned tube heat exchanger and the rear finned tube heat exchanger from the air inlet longitudinally and rearward.

[0103] The air conditioner main unit double-layer structure air outlet cavity is arranged above the finned tube heat exchanger assembly by utilizing the idle space on the top of the equipment platform, the air outlet of the air outlet cavity is arranged on the same side and above the air inlet of the air inlet passage, and the area of the air outlet is significantly smaller than that of the air inlet.

[0104] This embodiment establishes the air conditioner host external heat exchanger inlet and outlet air field by running multiple fans: multiple fans draw air in the respective negative pressure cavity to generate negative pressure in the cavity, pull ambient air at medium speed from the air conditioner host inlet into the air conditioner host, then disperse and slow down, flow through the heat exchanger fin gap at low speed to complete heat exchange, then enter the respective negative pressure cavity, then gather and accelerate to flow into the fan suction port with the lowest pressure, and finally be pumped by the fan to pass through the exhaust cavity and be discharged at high speed.

[0105] ③Refrigeration circuit design innovation

[0106] The air conditioner host of this embodiment innovatively sets the compressor, four-way valve, expansion valve, gas-liquid separator and other refrigeration circuit elements of two sets of systems in the middle and lower parts of the negative pressure cavity of the rear finned tube heat exchanger, which is exactly the ventilation blind area. These elements and the external heat exchanger, refrigerant connecting pipe, indoor unit heat exchanger and other components of the two sets of refrigeration systems form two independent refrigeration air conditioning circulation loops in the order of compressor-four-way valve-condenser-expansion valve-evaporator-four-way valve-gas-liquid separator-compressor. The compressor serves as the power of the refrigeration circulation loop, establishes high and low pressure states of the refrigerant in the condenser and evaporator pipelines respectively, drives the refrigerant to circulate and repeatedly phase change in the refrigeration circulation loop to realize "heat transfer", that is, the refrigerant liquid evaporates and absorbs heat in the evaporator, then absorbs heat from the low-temperature ambient air flowing through the fin gap through the huge fin heat absorption area S connected by the copper pipe, and then releases heat to the high-temperature ambient air flowing through the fin after being pumped by the compressor through the high-temperature and high-pressure refrigerant gas condensing and releasing heat in the condenser pipeline, and then releases heat to the high-temperature ambient air flowing through the fin through the huge fin heat release area S connected by the copper pipe, realizing the migration of heat from the low-temperature environment where the air conditioner evaporator is located to the high-temperature environment where the condenser is located.

[0107] The innovative design of one host with two systems increases the load flexibility of the air conditioning system.

[0108] This embodiment sets two or more small power unit hosts (including air conditioning compressor, four-way valve, expansion valve and fluorine circuit components of the electrical box) in one air conditioner host shell, reduces the rated capacity of each unit host, and through the combination of multiple small power air conditioning unit hosts, more efficiently meets the wide changes in building heat load, zoning changes, and stable COP of the refrigeration air conditioning system under low load and low load rate conditions, increasing the load flexibility of the air conditioning system.

[0109] The refrigeration system of the air conditioner host of this embodiment can be run simultaneously or independently;

[0110] The fan corresponding to the negative pressure chamber of the outer heat exchanger runs when the certain set of refrigeration system of the air conditioner main unit in this embodiment runs, and air in the horizontal C-shaped (or horizontal "mouth" shaped) outer heat exchanger negative pressure chamber connected therewith is drawn and discharged. Negative pressure is generated in the chamber, and the ambient air outside the outer facade of the outer heat exchanger is pulled into the air conditioner main unit. After the ambient air enters the air conditioner main unit, it flows through the large-section air inlet channel, is further dispersed and slowed down, and flows to the horizontal C-shaped (or horizontal "mouth" shaped) finned tube heat exchanger with a large total ventilation section and a large total fin area. The ambient air flows at a low speed through the gap between the fins of the outer heat exchanger, and heat exchange between the ambient air and the refrigerant in the copper tube of the outer heat exchanger is realized. After the heat exchange, the air in the negative pressure chamber flows into the fan suction port with the lowest pressure, is pressurized by the fan, and is discharged at a high speed through the exhaust chamber.

[0111] Embodiment 2

[0112] The difference between this embodiment and embodiment 1 is that the front finned tube heat exchanger 371 in the finned tube heat exchangers corresponding to the two refrigeration systems is a horizontal C-shaped finned tube heat exchanger structure.

[0113] Both this embodiment and embodiment 1 adopt the aerodynamic layout of short-side middle-low medium-speed air inlet and top high-speed air outlet for the air conditioner main unit, and the main sections of the air inlet channel and the air outlet channel of the finned tube heat exchanger assembly are included in the air conditioner main unit. The finned tube heat exchanger assembly is constructed by using the basic unit of the finned tube heat exchanger. In the limited space of the air conditioner main unit, two finned tube heat exchangers are arranged, and a large-area heat exchanger ventilation surface is developed along the fin group air inlet surface of the finned tube heat exchanger. A large-area fin heat transfer surface is further developed on the large-area heat exchanger ventilation surface.

[0114] As shown in Figure 11 , the finned tube heat exchanger assembly includes two finned tube heat exchangers, and both of the finned tube heat exchangers are horizontal C-shaped finned tube heat exchangers.

[0115] As shown in Figure 11 , both this embodiment and embodiment 1 are provided with two heat exchanger negative pressure chambers along the long side of the air conditioner main unit, and the air inlet duct and the exhaust chamber communicated with the negative pressure chamber. Corresponding to different refrigeration systems, they can be independently operated, and have the characteristics of small size and flexible operation of the air conditioner main unit.

[0116] In this embodiment, the front finned tube heat exchanger is a horizontal C-shaped finned tube heat exchanger structure, the back side of the front finned tube heat exchanger is a back plate without ventilation, and the vertical air duct between the front finned tube heat exchanger and the rear finned tube heat exchanger only supplies air to the rear finned tube heat exchanger. The air inlet duct of the rear finned tube heat exchanger releases more space, so that the air inlet resistance of the rear finned tube heat exchanger is smaller, and the ventilation and heat exchange are more uniform.

[0117] Embodiment 3

[0118] AsFigures 12-14 The difference between the present embodiment and embodiment 1 is that the front finned tube heat exchanger 371 of the two sets of refrigeration systems is a vertical V-shaped finned tube heat exchanger structure.

[0119] Both the present embodiment and embodiment 1 adopt the aerodynamic layout of short-side side middle-low speed air inlet and top high-speed air outlet for the air conditioner host, and the main sections of the air inlet passage and the air outlet passage of the finned tube heat exchanger assembly are arranged inside the air conditioner host. The finned tube heat exchanger assembly is constructed by using the basic unit of the finned tube heat exchanger. In the limited space of the air conditioner host, two finned tube heat exchangers are arranged, and a large-area heat exchanger ventilation surface is developed along the fin group air inlet surface of the finned tube heat exchanger. A huge fin heat transfer surface is further developed on the large-area heat exchanger ventilation surface.

[0120] As shown in Figures 12-14 The present embodiment and embodiment 1 are both provided with two outer heat exchanger negative pressure chambers along the long side of the air conditioner host, and the air inlet duct and the air outlet chamber are in communication with the negative pressure chamber. Different refrigeration systems can be independently operated, and the air conditioner host is small in size and flexible in operation.

[0121] Two fans 38 are arranged above the negative pressure chamber of the front finned tube heat exchanger 371.

[0122] The present embodiment has all the advantages of embodiment 1. In addition, the front finned tube heat exchanger adopts a vertical V-shaped finned tube heat exchanger structure, which reduces the volume of the lower part of the negative pressure chamber of the front finned tube heat exchanger, releases more space for the air inlet duct inside the air conditioner host, and makes the air inlet resistance of the rear finned tube heat exchanger smaller and the ventilation and heat exchange more uniform.

[0123] Embodiment 4

[0124] As shown in Figures 15-17 An air conditioner host equipment platform is provided, and a plurality of air conditioner hosts of embodiments 1, 2 or 3 are arranged in the equipment platform in the transverse direction. Only one row of air conditioner hosts is arranged in the equipment platform in the transverse direction.

[0125] The equipment platform is provided with an outer facade 1 for ventilation, and the air inlet 125 of the air conditioner host finned tube heat exchanger assembly of the air conditioner host system is close to the outer facade 1. The air outlet chamber 33 is arranged above the air conditioner host, and the air outlet 331 of the air outlet chamber 33 is close to the outer facade 1.

[0126] The air outlet area 132 and the air inlet area 34 are arranged on the outer facade 1. The air outlet area 132 on the outer facade 1 corresponds to the air outlet 331 of the air conditioner host, and the air inlet area 34 on the outer facade 1 corresponds to the air inlet 125 of the air conditioner host.

[0127] The air outlet area 132 on the outer facade 1 is continuously arranged on the upper part of the outer facade, and the air inlet area 34 on the outer facade is continuously arranged on the middle-lower part of the outer facade.

[0128] The demarcation between the air exhaust area of the facade 1 and the air intake area of the facade 1 is a horizontal straight line or is close to a horizontal straight line.

[0129] The area of the air exhaust area on the facade 1 is 25% to 50% of the area of the facade used for ventilation. The facade used for ventilation refers to the facade through which air flows in and out.

[0130] The refrigerant connecting pipe 81 or the chilled water connecting pipe is arranged on the bridge 8, and the air conditioning main unit module is connected to the air conditioning indoor unit or the fan coil of each area of each floor of the building through the refrigerant connecting pipe 81 or the chilled water connecting pipe. The air conditioning main unit module and the indoor unit / fan coil are jointly operated to refrigerate (heat) the indoor space of the building.

[0131] The back plate 39 of the air conditioning main unit and the inner wall surface 2 of the equipment platform form a three-in-one channel 51 for people walking, maintenance, and setting up copper pipes and cable bridges of the air conditioning system. In this embodiment, the idle space on the top of the equipment platform is utilized, and an air exhaust cavity is arranged on the top space. The air exhaust opening of the air exhaust cavity is arranged on the same side as the air intake opening of the air intake channel and is arranged vertically. The area of the air exhaust opening is significantly smaller than the area of the air intake opening.

[0132] In this embodiment, the equipment platform is taken as the longitudinal direction, and the facade is taken as the transverse direction.

[0133] In this embodiment, the air conditioning main unit is installed on the equipment platform in the transverse direction, and the air intake and exhaust openings of the air conditioning main unit face the facade. That is, the long side of the air conditioning main unit is taken as the longitudinal direction, and the short side is taken as the transverse direction.

[0134] In this embodiment, the air conditioning main unit of the double refrigeration system is arranged in the longitudinal direction of the multiple negative pressure cavities to build a heavy-load equipment platform. In order to solve the problems of low energy density of the air conditioning main unit and the equipment platform and excessive transverse width of the equipment platform occupying the facade of the building, the air conditioning main unit is restructured under the premise of ensuring the convenience of installation and maintenance of the air conditioning main unit:

[0135] ①High-power-density small and flexible air conditioning main unit

[0136] In this embodiment, the high-power-density air conditioning main unit is adopted. The main part of the air intake channel and the air exhaust channel of the finned tube heat exchanger assembly is arranged inside the air conditioning main unit. In this embodiment, the finned tube heat exchanger is taken as a basic unit to construct the finned tube heat exchanger assembly. Multiple horizontal C-shaped and vertical V-shaped finned tube heat exchangers are arranged in the limited space of the air conditioning main unit. A large-area heat exchanger ventilation surface is developed along the air inlet surface of the multiple horizontal C-shaped and vertical V-shaped finned tube heat exchangers. A huge fin heat transfer surface is further developed on the large-area heat exchanger ventilation surface to build a heavy-load air conditioning main unit.

[0137] The multiple outer heat exchanger negative pressure cavities arranged along the long side of the air conditioner main unit, the air inlet air duct and the air outlet cavity communicated with the negative pressure cavities can independently operate corresponding to different refrigeration systems, and have the characteristics of small size and flexible operation of the air conditioner main unit.

[0138] The compressor and the fluorine circuit components of the electrical box of the air conditioner main unit in the embodiment are arranged in the negative pressure cavity of the horizontal C-shaped finned tube heat exchanger, and the back plate of the negative pressure cavity faces the maintenance passage for convenient maintenance.

[0139] 2. Recombination of air conditioner main unit outer heat exchanger air path

[0140] In the lower space of the equipment platform, the air conditioner main units are arranged transversely adjacent to each other, the vertical V-shaped finned tube heat exchanger of the two air conditioner main units arranged transversely adjacent to each other constructs a hexagonal air inlet passage which is narrow at the top and wide at the bottom; and the air conditioner main units directly introduce fresh air from the outer facade of the equipment platform, and cancel the traditional rear air conditioner main unit air inlet and air outlet passage; the air outlet adopts an upper air outlet mode, and the air outlet of the outer heat exchanger directly discharges to the outside environment atmosphere outside the outer facade.

[0141] 3. Development of idle and inefficient space of the equipment platform

[0142] The air outlet cavities of the air conditioner main units are arranged at intervals at the top of the equipment platform.

[0143] The air conditioner main units are transversely arranged at intervals of about 100 mm, which meets the requirements of pulling out and feeding in the air conditioner main units in the longitudinal direction.

[0144] A maintenance passage for people is arranged between the inner wall surface of the equipment platform and the air conditioner main unit group arranged transversely; a bridge for arranging the copper pipe connecting the indoor unit and the outdoor unit of the air conditioner system, and a bridge for the power cable and the signal line of the air conditioner main unit are arranged above the maintenance passage.

[0145] The two sets of refrigeration systems of the air conditioner main unit in the embodiment can operate simultaneously or independently.

[0146] During operation of the embodiment, the air conditioner main unit in the equipment platform is arranged in the longitudinal direction, the outer heat exchanger negative pressure cavity fan operates, air in the respective communicated negative pressure cavities is drawn and discharged, negative pressure is generated in the cavity, and environmental air is pulled to pass through the outer facade of the equipment platform and enter the interior of the air conditioner main unit; after entering the interior of the air conditioner main unit, the external environmental air is dispersed and decelerated, flows to the finned tube heat exchanger, flows through the fin gap of the finned tube heat exchanger at low speed, and realizes heat exchange between the environmental air and the refrigerant in the copper pipe of the heat exchanger; after heat exchange, the environmental air enters the negative pressure cavity, is further collected and accelerated, flows into the fan suction port with the lowest pressure, is pressurized and accelerated by the fan, passes through the air outlet cavity, passes through the top of the outer facade of the equipment platform, and is injected into the environment atmosphere at high speed for diffusion and dilution.

[0147] The device platform of the embodiment, aiming at the problems of low energy density of air conditioner host and device platform, too large lateral width of device platform occupying building facade, etc., reorganizes the air flow system of the outer heat exchanger of air conditioner host under the premise of ensuring the convenience of installation and maintenance of air conditioner host, and has the advantages of:

[0148] ① Constructing the side-in and side-out air flow system of air conditioner host through the outer facade of device platform

[0149] The embodiment innovates the aerodynamic layout of "the outer facade of platform and the middle and low speed air inlet of middle and lower part of air conditioner host, the high speed air outlet at the top, the inlet and outlet being arranged in the same direction and on the same side, the area of air inlet: air outlet ≈ 2:1", sets the air outlet section area at the top of the negative pressure cavity of outer heat exchanger of air conditioner host to be about 1 / 2 of the air inlet, develops the air duct function of the top space of device platform, and sets the air inlet and outlet of air conditioner host in the same direction, on the same side, up and down, and vertically on the outer facade of device platform, thereby constructing the side-in and side-out air flow structure system of air conditioner host device platform.

[0150] Under the design concept of the area of air inlet: air outlet ≈ 2:1 of the outer facade of device platform in the embodiment, the air outlet speed reaches twice of the air inlet speed, and the dynamic pressure head of air outlet reaches 4 times of the dynamic pressure head of air inlet, thereby effectively improving the speed and kinetic energy of air outlet of outer heat exchanger of air conditioner host, and effectively improving the range and diffusion and dilution effect of air outlet penetrating the outer facade of device platform into the environment.

[0151] ② Improve the power density of device platform and reduce the area occupied by device platform

[0152] The embodiment uses finned tube heat exchanger as the basic unit of heat exchanger to construct finned tube heat exchanger assembly, sets multiple finned tube heat exchangers in the limited space of air conditioner host, expands the large area heat exchanger ventilation surface along the air inlet surface of multiple finned tube heat exchanger fin groups, and further expands the huge area fin heat transfer surface on the large area heat exchanger ventilation surface, thereby effectively expanding the total fin and heat exchange area S of finned tube heat exchanger assembly of air conditioner host, reducing the heat transfer temperature difference of heat exchanger body, increasing the evaporation pressure and reducing the condensation pressure, and constructing heavy load air conditioner host.

[0153] The air flow structure of air conditioner host used in the embodiment is in the chain process of medium speed air inlet of outer heat exchanger airflow → dispersion and deceleration → huge amount of fin heat exchange on total huge ventilation surface → collection and acceleration → fan pressure boosting → high speed outlet, takes the fan as the power source and the huge amount of heat exchanger fins as the lowest speed area of airflow, completes one fan pressure boosting and twice static pressure-dynamic pressure conversion before and after the fan, is high efficient and smooth, constructs the air flow structure of internal high efficient heat exchange of air conditioner host, and exhibits the heavy load characteristics of air conditioner host.

[0154] The embodiment is based on the air conditioner host with heavy load characteristics, and develops the air inlet channel function of the lower outside of the vertical V-shaped finned tube heat exchanger of the air conditioner host through the innovation of the equipment platform layout method, develops the exhaust air duct function of the idle space at the top of the equipment platform, compresses the horizontal spacing between the air conditioner hosts, and realizes "three in one" of the pedestrian passage, the maintenance passage, and the copper pipe cable bridge passage, so that the land area of the invalid and inefficient space and the ventilation blind area is greatly compressed, the average refrigeration and heating power density (i.e. unit area refrigerating capacity and heating capacity) of the equipment platform is greatly increased from the present situation of about 11.6kw / ㎡ to more than 25kw / ㎡, which is increased by more than 100%, and the equipment platform area is saved by 1 / 2 under the same refrigeration and heating load.

[0155] ③The equipment layer outer facade horizontal width occupied by the air inlet and outlet surface of the air conditioner host

[0156] The building outer facade width is an important resource in the building index system next to the building area, and the air inlet and outlet surface of the present air conditioner host occupies too much horizontal width of the equipment layer outer facade, which blocks the ventilation, lighting, and visual communication between the internal space of the same floor building and the external environment, and has become a prominent problem in the building heating, ventilation, and air conditioning design.

[0157] The embodiment improves the power density of the air conditioner host body by recombining the internal and external heat exchangers of the air conditioner host body and the air inlet and outlet paths of the external heat exchanger, and greatly reduces the low-efficiency and invalid space by recombining the structure relationship between the air conditioner host body and the equipment platform, so that the equipment platform land area is greatly reduced under the same building heat load condition, the horizontal width of the building equipment layer outer facade occupied by the air inlet and outlet surface of the air conditioner host is greatly reduced, and the ventilation, lighting, and visual communication between the internal space of the same floor building and the external environment are ensured.

[0158] ④Convenient air conditioner host detection and maintenance

[0159] The air conditioner host used in the embodiment is provided with a plurality of external heat exchanger negative pressure cavities in the longitudinal direction, and the compressor, the gas-liquid separator, the four-way valve, the expansion valve, the electrical box, and other fluorine circuit components are concentratedly arranged in the negative pressure cavity of the rear finned tube heat exchanger, and there are no fluorine circuit components in the front finned tube heat exchanger negative pressure cavity except the air fan.

[0160] The back plate of the negative pressure cavity of the rear finned tube heat exchanger in the embodiment faces the maintenance passage on the inner side of the equipment platform, which facilitates the inspection and maintenance of the air conditioner host: when a fault occurs, the back plate of the horizontal C-shaped finned tube heat exchanger negative pressure cavity of the air conditioner host is opened on the maintenance passage on the inner side of the equipment platform, the compressor, the gas-liquid separator, the four-way valve, the expansion valve, the electrical box, and other fluorine circuit components that may fail are clearly visible, and the inspection and maintenance are very convenient. The embodiment solves the inherent inspection and maintenance problem of the air conditioner host.

[0161] Obviously, the above embodiments of the present application are merely exemplary but not intended to limit the embodiments of the present application. Based on the above description, any other variations or changes can be made by those skilled in the art without departing from the spirit and principles of the present application. It is not necessary to list all the embodiments here. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall fall within the scope of the claims of the present application.

Claims

1. A double refrigeration system air conditioner main unit provided with multiple negative pressure cavities along the long side, characterized in that, The finned tube heat exchanger assembly, the shell, the air conditioner compressor, the gas-liquid separator and the fan are included. The finned tube heat exchanger assembly includes at least two finned tube heat exchangers, which include horizontal C-shaped finned tube heat exchangers, horizontal "mouth"-shaped finned tube heat exchangers and / or vertical V-shaped finned tube heat exchangers. The at least two finned tube heat exchangers are arranged in the shell along the long side direction at intervals, and the gap between the front finned tube heat exchanger and the rear finned tube heat exchanger along the long side direction is an air inlet channel. The front finned tube heat exchanger is a vertical V-shaped finned tube heat exchanger, a horizontal "mouth"-shaped finned tube heat exchanger or a horizontal C-shaped finned tube heat exchanger, and the rear finned tube heat exchanger is a horizontal C-shaped finned tube heat exchanger. The transverse width of the front horizontal "mouth"-shaped finned tube heat exchanger or the horizontal C-shaped finned tube heat exchanger close to the air inlet is less than or equal to the transverse width of the rear finned tube heat exchanger. The at least two finned tube heat exchangers of the finned tube heat exchanger assembly are respectively connected with different refrigeration air conditioning system compressors. At least two groups of gas-liquid separators, air conditioner compressors, four-way valves, heat exchanger assemblies, expansion valves and refrigerant pipelines of air conditioner indoor units are sequentially communicated to construct at least two groups of refrigerant circulation loops of air conditioning systems and form at least two independent air conditioning unit main machines. Fans are arranged at the top of the negative pressure cavities of the finned tube heat exchangers. The air conditioner compressors and the gas-liquid separators are arranged in the bottom part of the negative pressure cavity of the rear finned tube heat exchanger or in the lower space outside the negative pressure cavity. The air conditioner main machine is arranged on a semi-closed equipment platform, at least one air conditioner main machine is arranged in the equipment platform along the transverse direction, the equipment platform is provided with an outer facade for ventilation, the air inlet air distribution channel of the air conditioner main machine is close to the outer facade, and the air outlet of the air exhaust cavity is arranged on and / or close to the outer facade.

2. The air conditioner host of the double refrigeration system with multiple negative pressure cavities arranged along the long side according to claim 1, characterized in that, The inner bottom of the shell is provided with a height-increasing support for mounting the finned tube heat exchanger, the rear finned tube heat exchanger is arranged on the inner bottom of the shell, and the front finned tube heat exchanger is arranged on the height-increasing support.

3. An air conditioning host device platform, characterized by, The space in the shell below the front finned tube heat exchanger expanded by the height-increasing support constitutes an air inlet channel at the bottom of the air conditioner main machine.

4. The air conditioner main unit apparatus platform according to claim 3, wherein, The fan is an axial flow fan or a centrifugal fan, and the compressor is a fixed-frequency compressor or a variable-frequency compressor.

5. The air conditioner main unit apparatus platform according to claim 3, wherein, At least one air conditioner main machine according to any one of claims 1-2 is arranged in the equipment platform along the transverse direction, the equipment platform is provided with an outer facade for ventilation, the air inlet air distribution channel of the air conditioner main machine is close to the outer facade, and the air exhaust cavity is arranged above the air conditioner main machine, and the air outlet of the air exhaust cavity is arranged on and / or close to the outer facade.

6. The air conditioner main unit apparatus platform according to claim 3, wherein, The air exhaust area on the outer facade corresponds to the air exhaust port of the air conditioner main machine, and the air inlet area on the outer facade corresponds to the air inlet port of the air conditioner main machine. The air exhaust area on the outer facade is continuously arranged on the upper part of the outer facade, and the air inlet area on the outer facade is continuously arranged on the middle and lower part of the outer facade. The area of the air exhaust area on the outer facade is 25%-50% of the area of the outer facade for ventilation.

7. The air conditioner host device platform of claim 3, wherein, The back plate of the air conditioner host and the inner wall of the equipment platform form a three-in-one channel for people, maintenance and setting up copper pipe and cable bridge of the air conditioning system.

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