CN105805825A

CN105805825A - Air conditioner and control method thereof

Info

Publication number: CN105805825A
Application number: CN201410849804.9A
Authority: CN
Inventors: 李权旭; 谯峤; 任冰; 万积清; 王丽; 樊易周; 戴天鸿; 罗在军
Original assignee: Emerson Network Power Co Ltd; Emerson Network Power Jiangmen Co ltd
Current assignee: Victoria Technology Co Ltd Jiangmen Branch; Vertiv Tech Co Ltd
Priority date: 2014-12-30
Filing date: 2014-12-30
Publication date: 2016-07-27
Anticipated expiration: 2034-12-30
Also published as: CN105805825B

Abstract

The invention relates to the technical field of air conditioners and discloses an air conditioner and a control method thereof. The air conditioner comprises a detection device, two cooling devices and a control device, wherein the detection device is used for detecting the parameters representing the outdoor environment state; each cooling device comprises a pump, an evaporator, a compressor, a condenser and a throttling element which are arranged on a pipeline and form an annular loop; the evaporators in the two cooling devices are used for cooling heating equipment; and the control device is connected with the detection device, the two pumps and the two compressors through signals and used for controlling the two pumps and the two compressors to operate according to the comparison results of the received parameters and the set threshold value. According to the technical scheme, the air conditioner is adjusted through the control device according to the temperature of the outside environment to operate in the double-pump mode or the single-pump and single-compressor mode or the double-compressor mode, so that the energy consumption of the air conditioner is reduced, and the operation efficiency of the air conditioner is improved; and meanwhile, the evaporators are connected with the equipment through channels, and the situation that the local portion is too hot during refrigeration is relieved.

Description

Air conditioner and control method thereof

Technical Field

The invention relates to the technical field of air conditioners, in particular to an air conditioner and a control method thereof.

Background

With the rapid development of network evolution and data services, high-power-density rack servers, blade servers, network switches and the like with smaller specifications, higher speed and stronger functions are increasingly adopted, the deployment density of equipment is increasingly high, the energy consumption of a single rack is increasingly high, and the heat productivity of the single rack or the local unit area of the rack is increased rapidly. The open-type mode that traditional communication computer lab was most adopted, after the computer lab was carried to outside refrigerating plant's cold wind, the computer lab environment was cooled off earlier, and cooling device lets ambient temperature drop earlier promptly, makes the equipment cooling in the frame again. The cooling mode of the machine room can not meet the requirement, local overheating of the machine room can be generated, the cooling efficiency of the machine room is low, energy is wasted, and the service life of an air conditioner is short.

Aiming at the problems, most manufacturers adopt a scheme of sealing a cold/hot channel and accurately controlling the air supply temperature. The scheme changes the traditional mode of 'first cooling environment and second cooling equipment', and proposes the concept of 'first cooling equipment and second cooling environment'. The compressor adopts the energy-saving technology of digital vortex or frequency conversion regulation, and the regulation of the refrigerating capacity of the machine room is realized by the variable capacity regulation of the compressor, so that more accurate temperature control is realized. Through effectively keeping apart cold and hot passageway, air conditioning system variable capacity is adjusted, control air conditioner air supply temperature, carries the direct accuracy of cold volume as required to distribute to needs refrigerated equipment, has greatly improved air conditioner cold volume and computer lab space availability factor, and the air conditioner energy consumption drops 20 ~ 30%, has effectively solved the local overheated difficult problem of this puzzlement data computer lab healthy development of computer lab simultaneously.

In recent years, as the national communication network scale and the user scale have been enlarged, the power consumption for operating the communication enterprise equipment has become an increasingly important cost. According to investigation, the power consumption of the precise air conditioner in the machine room accounts for more than 50% of the total power consumption of the machine room, and the power consumption of the air conditioner can reach about 70% of the power consumption of the base station or the module station in a plurality of base stations and module stations. Therefore, the effective reduction of the power consumption of the air conditioner by adopting a correct and reasonable comprehensive solution is an important direction for reducing the energy consumption of the air conditioner in the machine room.

Because the communication machine room has large heat productivity, the air conditioner in the machine room has the characteristic of all-weather operation. Aiming at the characteristic of year-round refrigeration of machine room air conditioners, a scheme which is generally adopted in the industry is provided by fully utilizing a natural cold source to save energy. At present, there are three main methods for saving energy by using natural cold sources:

fresh air refrigeration: the fresh outdoor air is filtered and then sent to the indoor, and is mixed with the indoor hot air and then discharged.

Naturally cooling ethylene glycol: the ethylene glycol cooling coil is added in the indoor unit, and the ethylene glycol solution with low outdoor temperature and indoor hot air exchange heat.

Pump and compressor complex system: compared with the original compressor system, the combined system is additionally provided with a pump system on the compressor system, and pump circulation refrigeration is adopted in low-temperature seasons (see figure 1).

Fig. 1 is a schematic diagram of a conventional pump and compressor complex system, which includes a pump 4, a compressor 3, an evaporator 2, a condenser 1, etc., and the conventional complex system has a liquid storage tank 5, and bypasses are provided at the compressor 3, the pump 4, and a throttle valve. When the outdoor temperature is high, the compressor system operates, the refrigerant absorbs heat through the evaporator 2 and becomes steam, the refrigerant becomes high-temperature high-pressure steam through the work of the compressor 3, the refrigerant releases heat to become liquid in the condenser 1, the pressure reduction and throttling are realized at the expansion valve, and finally the refrigerant reaches the evaporator 2 to complete a compressor refrigeration cycle, wherein the flow of the compressor system is controlled to a certain degree through the expansion valve; when the pump system operates, the refrigerant flows through the evaporator 2 and becomes gas through absorbing indoor heat, the heat release through the condenser 1 becomes liquid, the refrigerant reaches the liquid storage tank 5, after the vapor-liquid separation of the liquid storage tank 5, the liquid refrigerant is boosted through the pump 4, the supercooling degree is increased, and the refrigerant reaches the evaporator 2 to complete the refrigeration cycle of the pump system, wherein the flow of the pump system is mostly matched with different indoor unit systems through the control flow of devices such as a flow regulating valve arranged on a pipeline, and the flow of the pump system cannot be automatically regulated along with the refrigerating capacity.

Disclosure of Invention

The invention provides an air conditioner and a control method thereof, which are used for further improving the energy-saving effect of the air conditioner and improving the cooling efficiency.

The present invention provides an air conditioner, including:

a detection device that detects a parameter indicative of an outdoor environmental state;

two cooling devices, each cooling device comprising a pump, an evaporator, a compressor, a condenser and a throttling element arranged on the pipeline and forming an annular loop; the evaporators of the two cooling devices are used for cooling the heating equipment;

and the control device is in signal connection with the detection device, the two pumps and the two compressors respectively, and selectively controls the two pumps and the two compressors to operate according to a comparison result of the received parameters and the set threshold value.

In the technical scheme, the detection device detects the parameters representing the outdoor environment state, and the control device adjusts the air conditioner to operate in modes of double pumps, single pump + single compressor and double compressors according to the parameters, so that the energy consumption of the air conditioner is reduced, and the operation efficiency of the air conditioner is improved.

Preferably, the parameter is outdoor temperature or condensing pressure. Different parameters are used to control the operation of the air conditioner.

Preferably, when the parameter is the outdoor temperature, the control device selectively controls the two pumps and the two compressors to operate according to a comparison result between the received parameter and a set threshold, specifically:

when the received outdoor detection temperature is less than or equal to a first set temperature and greater than or equal to a second set temperature, the magnitude of the refrigeration demand and the set proportion is compared, when the refrigeration demand is less than or equal to the set proportion, the pump in one cooling device is controlled to operate, when the refrigeration demand is greater than the set proportion, the pump in the one cooling device is controlled to operate, and the compressor in the other cooling device is controlled to operate. The control of a pump and a compressor of an air conditioning system is further refined by taking the refrigeration requirement as a control condition, so that the energy consumption of the air conditioner is reduced, and the efficiency of the air conditioner is improved.

and when the received outdoor detection temperature is lower than a second set temperature, controlling the two pumps to operate. The operation of the pump is controlled according to the ratio result of the outdoor temperature and the set threshold value, so that the energy consumption of the air conditioner is effectively reduced, and the efficiency of the air conditioner is improved.

and controlling the two compressors to operate when the received outdoor detection temperature is greater than a first set temperature. The operation of the pump is controlled according to the ratio result of the outdoor temperature and the set threshold value, so that the energy consumption of the air conditioner is effectively reduced, and the efficiency of the air conditioner is improved.

Preferably, the air conditioner further comprises a temperature detection device for detecting the temperature of the supplied air;

the control device is in signal connection with the temperature detection device, and the control device is further used for:

when the detected air supply temperature is greater than or equal to a first set air supply temperature and less than or equal to a second set air supply temperature, controlling the compressor to keep the original power output;

when the detected air supply temperature is higher than a second set air supply temperature, controlling the compressor to increase the output power;

and when the detected air supply temperature is lower than a first set air supply temperature, controlling the compressor to reduce the output power. The working condition of a compressor in the air conditioning system is controlled by taking the air supply temperature as a control condition and according to the air supply temperature of the air supply temperature, so that the energy consumption of the air conditioner is reduced, and the efficiency of the air conditioner is improved.

Preferably, the air conditioner further comprises a temperature detection device for detecting the temperature of the supplied air; the control device is in signal connection with the temperature detection device, and the control device is further used for:

when the refrigeration demand is less than or equal to a set proportion, controlling a pump in a cooling device to operate, controlling the pump to keep original power output when the detected air supply temperature is greater than or equal to a first set air supply temperature and less than or equal to a second set air supply temperature, and controlling the pump to increase output power when the detected air supply temperature is greater than the second set air supply temperature; and when the detected air supply temperature is lower than a first set air supply temperature, controlling the pump to reduce the output power. The refrigeration requirement is used as the operation condition of the control pump, so that the operation condition of the pump can be accurately controlled, the energy consumption of the air conditioner is reduced, and the efficiency of the air conditioner is improved.

when the refrigeration demand is larger than a set proportion, controlling a pump in one cooling device to operate, controlling a compressor in the other cooling device to operate, and controlling the compressor to keep original power output when the detected air supply temperature is larger than or equal to a first set air supply temperature and smaller than or equal to a second set air supply temperature, and controlling the compressor to increase output power when the detected air supply temperature is larger than the second set air supply temperature; and when the detected air supply temperature is lower than a first set air supply temperature, controlling the compressor to reduce the output power. The refrigeration requirement is used as the operation condition of the control pump, so that the operation condition of the pump can be accurately controlled, the energy consumption of the air conditioner is reduced, and the efficiency of the air conditioner is improved.

when the detected air supply temperature is greater than or equal to a first set air supply temperature and less than or equal to a second set air supply temperature, controlling the pump to keep the original power output;

when the detected air supply temperature is higher than a second set air supply temperature, controlling the pump to increase the output power;

and when the detected air supply temperature is lower than a first set air supply temperature, controlling the pump to reduce the output power. The air supply temperature is used as the operation condition of the control pump, so that the operation of the pump can be controlled more accurately, the energy consumption of the air conditioner is reduced, and the efficiency of the air conditioner is improved.

Preferably, the evaporators of the two cooling devices are respectively communicated with the heat generating equipment through sealed channels; the detected air supply temperature is the air supply temperature in the sealed channel. The accuracy of air supply temperature detection is improved.

Preferably, the refrigeration device further comprises a first bypass and/or a second bypass; wherein,

two ends of the first bypass are respectively communicated with an inlet and an outlet of the pump, and a first switch valve is arranged on the first bypass;

and two ends of the second bypass are respectively communicated with the air suction port and the air exhaust port of the compressor, and a second switch valve is arranged on the second bypass.

The internal resistance of the air conditioner under different mode working conditions is reduced through the arranged bypass, the energy consumption of the air conditioner is reduced, and the functions of protecting the compressor and the pump are achieved.

Preferably, the control device is in signal connection with the first switch valve and controls the first switch valve to be closed when the pump is operated and controls the first switch valve to be opened when the compressor is operated; the control device is in signal connection with the second switch valve, and controls the second switch valve to be opened when the pump runs and controls the second switch valve to be closed when the compressor runs. And automatic control is realized.

Preferably, the refrigeration device further comprises a liquid storage tank arranged between the pump and the condenser. The height difference between the inlets of the liquid storage tank and the pump provides certain cavitation allowance for the system, pump cavitation is reduced, meanwhile, the best refrigerant filling amount of the system is different due to different working conditions, and the refrigerant amount in the condenser and the evaporator can be always kept best when the liquid storage tank is used for ensuring various operation modes.

The invention also provides a control method of the air conditioner, which comprises the following steps:

detecting a parameter indicative of an outdoor environmental state;

and selectively controlling the two pumps and the two compressors to operate according to the comparison result of the received parameters and the set threshold value.

In the technical scheme, the detection device detects the parameters representing the outdoor environment state, and the control device adjusts the air conditioner to operate in modes of double pumps, single pump + single compressor and double compressors according to the parameters, so that the air conditioner can select the working mode with the lowest energy consumption to operate according to the detected data, the energy consumption of the air conditioner is effectively reduced, and the operating efficiency of the air conditioner is improved.

Preferably, when the parameter is the outdoor temperature, the two pumps and the two compressors are selectively controlled to operate according to a comparison result between the received parameter and a set threshold, specifically:

and when the received outdoor detection temperature is lower than a second set temperature, controlling the two pumps to operate. The control of a pump and a compressor of an air conditioning system is further refined by taking the refrigeration requirement as a control condition, so that the energy consumption of the air conditioner is reduced, and the efficiency of the air conditioner is improved.

Preferably, the method further comprises the following steps: detecting the air supply temperature;

Preferably, the method further comprises detecting the temperature of the supplied air;

Preferably, the method further comprises the steps of detecting the air supply temperature, controlling the operation of a pump in one cooling device when the refrigeration demand is greater than a set proportion, controlling the operation of a compressor in the other cooling device, controlling the compressor to keep the original power output when the detected air supply temperature is greater than or equal to a first set air supply temperature and less than or equal to a second set air supply temperature, and controlling the compressor to increase the output power when the detected air supply temperature is greater than the second set air supply temperature; and when the detected air supply temperature is lower than a first set air supply temperature, controlling the compressor to reduce the output power. The refrigeration requirement is used as the operation condition of the control pump, so that the operation condition of the pump can be accurately controlled, the energy consumption of the air conditioner is reduced, and the efficiency of the air conditioner is improved.

Preferably, the method further comprises detecting the temperature of the supplied air

Drawings

FIG. 1 is a system diagram of a prior art air conditioner;

FIG. 2 is a system diagram of two cooling devices provided by an embodiment of the present invention;

fig. 3 is a control flowchart of an air conditioner according to an embodiment of the present invention;

fig. 4 is a control flowchart of the air conditioner in the dual pump mode according to the embodiment of the present invention;

fig. 5 is a control flowchart of an air conditioner in a dual compressor mode according to an embodiment of the present invention;

fig. 6 is a control flowchart of an air conditioner in a single pump + single compressor mode according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a system of an air conditioner with a first bypass according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a system with a second bypass for an air conditioner according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a system with a first bypass and a second bypass for an air conditioner according to an embodiment of the present invention;

fig. 10 is a schematic view of an air conditioner system with an accumulator according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of an air conditioner system with an accumulator and a first bypass according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of a system of an air conditioner having an accumulator and a second bypass according to an embodiment of the present invention;

fig. 13 is a schematic diagram of a system of an air conditioner with an accumulator, a first bypass, and a second bypass according to an embodiment of the present invention.

Detailed Description

The following detailed description of specific embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

As shown in fig. 2, fig. 2 is a schematic system diagram of a refrigeration and air-conditioning system provided by an embodiment of the invention. The heating equipment is equipment which needs an air conditioner to cool the equipment.

An embodiment of the present invention provides a refrigeration air conditioner, including:

a detection device 8 for detecting a parameter indicative of an outdoor environmental state;

two cooling devices, each comprising a pump 4, an evaporator 2, a compressor 3, a condenser 1 and a throttling element 6, arranged on a pipe and forming an annular circuit; the evaporators 2 in the two cooling devices are used for cooling the heating equipment;

and the control device 7 is in signal connection with the detection device 8, the two pumps 4 and the two compressors 3 respectively, and selectively controls the two pumps 4 and the two compressors 3 to operate according to the comparison result of the received parameters and the set threshold value.

In the above embodiment, by selectively controlling the two pumps 4 and the two compressors 3 to operate in different combinations, the outdoor cold source and the low operation energy consumption characteristic of the pumps 4 are fully utilized, and the operation consumption of the air conditioner is effectively reduced while the heat source refrigeration requirement is realized.

Wherein the parameter is outdoor temperature or condensing pressure. When the parameter is detected, the operation of the air conditioner can be controlled according to the comparison result of the parameter and the set threshold value. To facilitate understanding of the air conditioner provided in the present embodiment, the following description is given with an outdoor temperature as a parameter, and it should be understood that the following description is only an exemplary embodiment and is not intended to limit the present invention.

When the outdoor temperature is used as the control condition, the control of the pump 4 and the compressor 3 by the control device is determined by the ratio of the magnitude of the control temperature to the magnitude of the set threshold, as shown in fig. 3.

When the parameter is the outdoor temperature, the control device 7 selectively controls the two pumps 4 and the two compressors 3 to operate according to the comparison result of the received parameter and the set threshold, specifically:

when the received outdoor detection temperature is higher than a first set temperature, controlling the two compressors 3 to operate; or,

when the received outdoor detection temperature is less than or equal to a first set temperature and greater than or equal to a second set temperature, comparing the refrigeration demand with the set proportion, when the refrigeration demand is less than or equal to the set proportion, controlling the operation of the pump 4 in one cooling device, and when the refrigeration demand is greater than the set proportion, controlling the operation of the pump 4 in one cooling device and the operation of the compressor 3 in the other cooling device; or,

and when the received outdoor detection temperature is lower than a second set temperature, controlling the two pumps 4 to operate.

In the three control modes, different control modes can be selected according to actual conditions, that is, a mode of operating two pumps, a mode of operating two compressors, or a control mode of a pump + compressor can be set independently, or the control modes can be combined arbitrarily, that is, one air conditioning system can be provided with two pump operation modes and two compressor operation modes, or two pump operation modes and a mode of a pump + compressor, and other different control modes are set, and a user can select the modes according to actual use conditions.

To facilitate an understanding of the above-described embodiments, they are described in detail below with reference to the accompanying drawings.

The operation mode of the air conditioner is adjusted by detecting outdoor temperature, namely external environment temperature, and taking the external environment temperature as a judgment condition, and in order to realize air supply temperature control, the refrigerating capacity in the three modes needs to reach the nominal refrigerating capacity of the unit. As shown in fig. 2, two cooling devices are a and B, each cooling device includes a pump 4 and a compressor 3, and since the energy efficiency of the pump system is much higher than that of the compressor system, the control idea of the unit is to start the pump 4 first to operate the pump system, and to start the compressor 3 again to operate the compressor system if the pump 4 does not meet the requirement. When the refrigerating capacity of the pump system reaches the level of the compressor system, the pump 4 completely replaces the compressor 3, the unit enters a double-pump 4 mode, and the two cooling devices both start the pump 4; when the refrigerating capacity of the pump 4 is smaller than that of the compressor 3 and the small refrigerating capacity can be compensated by the compressor 3 of another cooling device, the unit enters a single-compressor 3+ single-pump 4 mode, namely one cooling device starts the compressor 3, the other cooling device starts the pump 4, and at the moment, the pump runs at full power; when the pump 4 has a smaller refrigerating capacity than the compressor 3 and the compressor 3 of the other cooling device cannot fully compensate, the mode of the two compressors 3 is entered, and the compressors 3 are started by the two cooling devices.

The cooling capacity provided by the pump system is gradually reduced along with the rise of the outdoor air temperature, and the cooling capacity of the compressor system is basically unchanged. Therefore, in order to accurately control the temperature of the supplied air, the dual pump 4 is turned on under the condition that the pump system can provide a cooling capacity reaching that of the compressor system. That is, as shown in fig. 3, fig. 3 shows a control flow of the air conditioner provided in the present embodiment, where T is the detected outdoor temperature, M is the first set temperature, and N is the second set temperature. When the outdoor temperature T is less than N, the air conditioner enters a double-pump 4 mode, the two sets of refrigerating devices run in the pump 4 mode, and the value range of N is (-10, 10). The compressor 3 can adopt a variable frequency compressor or a digital scroll compressor, the capacity of the compressor is adjustable, and the maximum refrigerating capacity is generally 20 to 30 percent larger than the nominal refrigerating capacity; the pump system continuously attenuates the cold along with the rise of the outdoor temperature, when the refrigerating capacity of the pump 4 is attenuated to 70% -80% of that of the compressor 3, namely 1 compressor 3 and 1 pump 4 are required to be started, the insufficient cold of the pump system is compensated by the compressor system, the system enters a single compressor 3+ single pump 4 mode, namely, one cooling device runs in the compressor mode, and the other cooling device runs in the pump mode. When the cooling capacity of the pump 4 is less than 70% of the capacity of the compressor 3, the pump 4 cannot be turned on again for precise control of the supply air temperature. That is, as shown in fig. 3, when the outdoor temperature T > M, the system enters the dual-compressor 3 mode, both sets of cooling devices operate in the compressor 3 mode, the value range of M is (-5, 20), and the value of M needs to be greater than that of N. Preferably, the operating temperature range for the single compressor 3+ single pump 4 mode is (0, 10). In the above specific control manner, it should be understood that the specific control modes in different modes can be selected as required, and the selection thereof can be used alone or in any combination as in the above setting of different modes in the air conditioning system.

In addition, in order to control the air conditioner more accurately, the air conditioner also comprises a temperature detection device for detecting the temperature of the supplied air;

the control device 7 is in signal connection with the temperature detection device, and controls the two compressors 3 to operate when the received outdoor detection temperature T is greater than a first set temperature M, or controls the two pumps 4 to operate when the received outdoor detection temperature T is less than a second set temperature N and the detected air supply temperature is greater than or equal to the first set air supply temperature and less than or equal to the second set air supply temperature, controls the pumps 4 or the compressors 3 to keep original power output, and controls the pumps 4 or the compressors 3 to increase output power when the detected air supply temperature is greater than the second set air supply temperature; and when the detected air supply temperature is lower than the first set air supply temperature, controlling the pump 4 or the compressor 3 to reduce the output power. For convenience of description, the following detailed description is made with reference to the accompanying drawings.

Referring to fig. 4 and 5 together, fig. 4 shows a flow chart when operating in the dual pump 4 mode, and fig. 5 shows a flow chart when operating in the dual compressor 3 mode.

As shown in fig. 4, where b is the supply air temperature, R is the first set supply air temperature, and S is the second set supply air temperature; to ensure uniform supply air temperature, the two pumps 4 are controlled synchronously, with the same output. When the actual air supply temperature b is within the set setting range, namely R is more than or equal to b and less than or equal to S, the pump 4 is kept in an original state and does not act; when b is greater than S, the output of the pump 4 is increased, the refrigerating capacity is improved, and the air supply temperature is reduced; when b < R, the output of the pump 4 is reduced, the refrigerating capacity is reduced, the air supply temperature is increased, and the air supply temperature of the unit is controlled within a set range. The setting of R and S can be set according to the actual requirements of customers.

As shown in fig. 5, where b is the supply air temperature, R is the first set supply air temperature, and S is the second set supply air temperature; to ensure uniform supply air temperature, the two compressors 3 are controlled synchronously, with the same output. When the actual air supply temperature b is within the set setting range, namely R is more than or equal to b and less than or equal to S, the compressor 3 is kept in an original state and does not act; when b is greater than S, the output of the compressor 3 is increased, the refrigerating capacity is improved, and the air supply temperature is reduced; when b < R, the output of the compressor 3 is reduced, the refrigerating capacity is reduced, the air supply temperature is increased, and the air supply temperature of the unit is controlled within a set range. The setting of R and S can be set according to the actual requirements of customers.

By adopting the specific control mode to control the operation conditions of the pump and the compressor under the modes of the double pumps and the double compressors, the operation power of the pump and the compressor can be adjusted according to the actual condition, so that the power of the pump and the compressor is effectively reduced, and the efficiency of the air conditioner is improved.

For the pump and compressor mode, the control device 7 is further configured to compare the refrigeration demand with a set proportion when the received outdoor detection temperature is less than or equal to a first set temperature and greater than or equal to a second set temperature, control the pump 4 in one cooling device to operate when the refrigeration demand is less than the set proportion, control the pump 4 to keep the original power output when the detected air supply temperature is greater than or equal to the first set air supply temperature and less than or equal to the second set air supply temperature, and control the pump 4 to increase the output power when the detected air supply temperature is greater than the second set air supply temperature; when the detected air supply temperature is lower than the first set air supply temperature, the pump 4 is controlled to reduce the output power;

when the refrigeration demand is larger than the set proportion, controlling a pump 4 in one cooling device to operate, controlling a compressor 3 in the other cooling device to operate, controlling the compressor 3 to keep the original power output when the detected air supply temperature is larger than or equal to a first set air supply temperature and smaller than or equal to a second set air supply temperature, and controlling the compressor 3 to increase the output power when the detected air supply temperature is larger than the second set air supply temperature; and when the detected air supply temperature is lower than the first set air supply temperature, controlling the compressor 3 to reduce the output power. The running condition of the compressor 3 is adjusted according to the actual detection condition, so that the energy consumption of the air conditioning system is effectively reduced.

The control flow is shown in fig. 6, and fig. 6 is a flow chart of the air conditioner of the present embodiment in the mode of using the single pump 4+ the single compressor 3. When the heat load is small and the refrigeration demand is less than a set proportion, the set proportion is 30% -70%, preferably 50%, only 1 pump 4 is started, and the output of the pump 4 is adjusted according to the air supply temperature, namely: when the actual air supply temperature b is within the set setting range, namely R is more than or equal to b and less than or equal to S, the pump 4 is kept in an original state and does not act; when b is greater than S, the output of the pump 4 is increased, the refrigerating capacity is improved, and the air supply temperature is reduced; when b < R, the output of the pump 4 is reduced, the refrigerating capacity is reduced, the air supply temperature is increased, and the air supply temperature of the unit is controlled within a set range. The setting of R and S can be set according to the actual requirements of customers. When the refrigeration demand is more than or equal to 50%, starting 1 pump 4 and 1 compressor 3, wherein the pump 4 and the compressor 3 are respectively the pump 4 of one cooling device of the A and B cooling devices, the other compressor 3 and the pump 4 output with 100% power, adjusting the output of the compressor 3 according to the air supply temperature, and controlling the air supply temperature of the unit within a set range, namely: when the actual air supply temperature b is within the set setting range, namely R is more than or equal to b and less than or equal to S, the compressor 3 is kept in an original state and does not act; when b is greater than S, the output of the compressor 3 is increased, the refrigerating capacity is improved, and the air supply temperature is reduced; when b < R, the output of the compressor 3 is reduced, the refrigerating capacity is reduced, the air supply temperature is increased, and the air supply temperature of the unit is controlled within a set range. The setting of R and S can be set according to the actual requirements of customers.

The air conditioner that this embodiment provided, in above-mentioned embodiment, in order to improve the accuracy that detects air supply temperature, through adopting evaporimeter 2 to pass through the sealed structure that communicates of passageway and equipment that generates heat respectively for the cold air after the evaporimeter heat transfer can directly enter into the equipment through the passageway and cool down, and simultaneously, the temperature that detects in the sealed passageway makes the result that detects more accurate.

As can be seen from the above description, the air conditioner provided by the present embodiment has the following advantages:

(1) by adopting the control device to represent the parameters of the outdoor environment according to the table as the conditions for controlling the operation of the pump and the compressor in the air conditioner, the pump or/and the compressor are controlled to work under different conditions, and the energy efficiency effect is remarkable: firstly, a pump 4 and compressor 3 composite system is applied to the occasion with high return air temperature, and the running time of the pump 4 is increased; secondly, the pump 4 and the compressor 3 both adopt variable capacity regulation, and the output of the pump 4 or the compressor 3 can be intelligently regulated according to the heat load; thirdly, three operation modes of a double pump 4, a single pump 4+ a single compressor 3 and a double compressor 3 are provided, and according to different environmental temperatures, on the premise of ensuring the air supply temperature, the most energy-saving mode is automatically entered; finally, the direct cooling of the device makes the air conditioner more energy efficient.

(2) Through adopting the more accurate operation of control pump and compressor under the operating mode of difference of different control conditions to realize more accurate temperature control: the compressor 3 and the pump 4 are both adjusted by adopting variable capacity, the output percentages of the compressor 3 and the pump 4 are adjusted in a double-compressor 3 mode and a single-compressor 3+ single-pump 4 mode, and the output percentage of the refrigerant pump 4 is adjusted in a double-pump 4 mode, so that the refrigerating capacity of the machine room is adjusted, the air conditioner refrigerating capacity is constantly kept to be matched with the heat load of the machine room, and the temperature of the machine room is accurately controlled.

(3) Through sealed pipeline intercommunication evaporimeter and equipment, solve local overheat problem: the mode of 'firstly cooling equipment and then cooling environment' is adopted, the air supply temperature of the air conditioner is controlled through variable capacity adjustment, the cooling capacity is directly and accurately conveyed and distributed to the equipment needing cooling according to the requirement, the cooling capacity of the air conditioner and the service efficiency of the space of the machine room are greatly improved, and the problem of local overheating of the machine room is effectively solved.

In addition to the above, the cooling device therein comprises a throttling element 6 arranged between the pump 4 and the evaporator 2. The throttling element 6 can be an electronic expansion valve or a thermal expansion valve; in addition, the flow of the pump 4 can be adjusted, and can be an inverter pump 4 or a pressure regulating pump 4, and the output of the compressor 3 can be adjusted, and can be a digital scroll compressor 3 or an inverter compressor 3.

Further, in order to improve the accuracy of the air conditioning control, it is preferable that the evaporators 2 of the two cooling devices are respectively communicated with the heat generating equipment through a sealed passage; the detected air supply temperature is the air supply temperature in the sealed channel. The air sent out by the air conditioner is isolated from the outside through the sealing channel, so that the accuracy of the air supply temperature detected by the detection device is ensured.

In order to further adjust the air conditioner provided by the present embodiment, the refrigeration device further includes a first bypass 9 and/or a second bypass 10; wherein,

two ends of the first bypass 9 are respectively communicated with an inlet and an outlet of the pump 4, and the first bypass 9 is provided with a first switch valve 11;

both ends of the second bypass 10 are respectively communicated with the air suction port and the air exhaust port of the compressor 3, and a second switch valve 12 is arranged on the second bypass 10.

The compressor 3 or the pump 4 is isolated from the system under different operation modes through the arranged first bypass 9 and the second bypass 10 so as to reduce the resistance of the system, wherein the first switch valve 11 and the second switch valve 12 can be mechanical valves and are opened or closed through manual control; or, the first switch valve 11 and the second switch valve 12 are one-way circulation valves, and realize that the refrigerant circulates in different flow channels in different modes through the one-way circulation performance of the valve body; alternatively, the first on-off valve 11 and the second on-off valve 12 may be electromagnetic control valves, in which case the control device 7 is in signal connection with the first on-off valve 11 and the second on-off valve 12, and controls the first on-off valve 11 to be closed and the second on-off valve 12 to be opened when the pump 4 is operated, and controls the first on-off valve 11 to be opened and the second on-off valve 12 to be closed when the compressor 3 is operated.

In the above embodiment, the cooling device may have only the first bypass 9 and only the second bypass 10, or may have both the first bypass 9 and the second bypass 10, and for convenience of description, reference is made to fig. 7, 8, and 9, and the following description will be made with reference to the drawings.

As shown in fig. 7, fig. 7 is a schematic structural diagram of a cooling device with only a first bypass 9, when such a structure is adopted, in the mode of the compressor 3, the compressor 3 and the bypass are opened, the pump 4 is closed, and the refrigerant from the condenser 1 can directly reach the throttling element 6 through the first bypass 9, so as to reduce the system resistance and protect the pump to prevent the high-pressure refrigerant from damaging the inside of the pump; in pump 4 mode, the bypass is closed.

As shown in fig. 8, fig. 8 shows a schematic view of the structure of the cooling device having only the second bypass 10; with this configuration, the bypass is closed in the compressor 3 mode; when the pump is in a 4 mode, the bypass is opened, so that the resistance of liquid flowing in the system is reduced, the energy consumption is reduced, the compressor is protected, and the liquid impact of the compressor is prevented.

As shown in fig. 9, fig. 9 shows a schematic structural diagram employing a first bypass 9 and a second bypass 10; a second bypass 10 is added to the suction and discharge of the compressor 3, and a first bypass 9 is added to the inlet and outlet of the pump 4: in the compressor 3 mode, the compressor 3 is on, the pump 4 and the second bypass 10 are off, and the first bypass 9 is on; in pump 4 mode, the compressor 3 and the first bypass 9 are closed and the pump 4 and the second bypass 10 are open.

Through the arrangement of the bypass, the resistance of the system when liquid flows is reduced, the energy consumption of the whole system is reduced, and the compressor and the pump are protected.

As shown in fig. 10, 11, 12 and 13, the refrigerating apparatus further includes a receiver tank 5 disposed between the pump 4 and the condenser 1. Specifically, a liquid storage tank 5 is additionally arranged between an outlet of a condenser 1 and an inlet of a pump 4, a small amount of refrigerant which is not completely changed into liquid through heat exchange of the condenser 1 can be subjected to vapor-liquid separation in the liquid storage tank 5, the liquid refrigerant is distributed below the liquid storage tank 5 due to gravity, a certain amount of liquid refrigerant is ensured in the liquid storage tank 5 all the time, a certain amount of vapor corrosion allowance is provided for the system due to the height difference between the inlets of the liquid storage tank 5 and the pump 4, cavitation corrosion of the pump 4 is reduced, meanwhile, the optimal refrigerant filling amount of the system is different due to operation under different working conditions, and the refrigerant amount in the condenser 1 and the refrigerant amount in the evaporator 2 can be always kept optimal in various operation modes by utilizing. In this embodiment, the cooling device with the first bypass 9 and/or the second bypass 10 may also be provided with an accumulator, and the specific structure thereof is as shown in fig. 11, 12 and 13, and fig. 11, 12 and 13 respectively show the structure of the air conditioner with the first bypass 9, the air conditioner with the second bypass 10 and the air conditioner with the first bypass 9 and the second bypass 10 after the accumulator is installed.

The embodiment of the invention also provides a control method of the air conditioner, which comprises the following steps:

detecting a parameter indicative of an outdoor environmental state;

The operation results of the two pumps and the two compressors are controlled by detecting the parameters of the outdoor environment state and according to the comparison structure of the parameters and the set threshold value, so that the energy consumption of the air conditioner can be effectively reduced.

The parameter is the outdoor temperature or the condensing pressure.

Specifically, when the parameter is the outdoor temperature, the two pumps and the two compressors are selectively controlled to operate according to a comparison result between the received parameter and a set threshold, specifically:

when the received outdoor detection temperature is less than or equal to a first set temperature and greater than or equal to a second set temperature, comparing the refrigeration demand with the set proportion, when the refrigeration demand is less than or equal to the set proportion, controlling the pump in one cooling device to operate, and when the refrigeration demand is greater than the set proportion, controlling the pump in the one cooling device to operate and the compressor in the other cooling device to operate; or,

when the received outdoor detection temperature is lower than a second set temperature, controlling the two pumps to operate; or,

and controlling the two compressors to operate when the received outdoor detection temperature is greater than a first set temperature.

The air conditioning system is controlled to work in different working modes through the specific control mode, so that the air conditioning system can work by selecting low energy consumption.

In addition, the method further comprises:

detecting the air supply temperature;

in a double-compressor mode, when the detected air supply temperature is greater than or equal to a first set air supply temperature and less than or equal to a second set air supply temperature, controlling the compressor to keep the original power output;

and when the detected air supply temperature is lower than a first set air supply temperature, controlling the compressor to reduce the output power.

In a double-pump mode, when the detected air supply temperature is greater than or equal to a first set air supply temperature and less than or equal to a second set air supply temperature, controlling the pump to keep the original power output;

and when the detected air supply temperature is lower than a first set air supply temperature, controlling the pump to reduce the output power.

In a mode of pump plus compressor, when the refrigeration demand is larger than a set proportion, controlling the pump in one cooling device to operate, controlling the compressor in the other cooling device to operate, and when the detected air supply temperature is larger than or equal to a first set air supply temperature and smaller than or equal to a second set air supply temperature, controlling the compressor to keep original power output, and when the detected air supply temperature is larger than the second set air supply temperature, controlling the compressor to increase output power; and when the detected air supply temperature is lower than a first set air supply temperature, controlling the compressor to reduce the output power. When the refrigeration demand is larger than a set proportion, controlling a pump in one cooling device to operate, controlling a compressor in the other cooling device to operate, and controlling the compressor to keep original power output when the detected air supply temperature is larger than or equal to a first set air supply temperature and smaller than or equal to a second set air supply temperature, and controlling the compressor to increase output power when the detected air supply temperature is larger than the second set air supply temperature; and when the detected air supply temperature is lower than a first set air supply temperature, controlling the compressor to reduce the output power.

In the above embodiment, the specific steps of the process are shown in fig. 3, where T is the detected outdoor temperature, M is the first set temperature, and N is the second set temperature. When the outdoor temperature T is less than N, the air conditioner enters a double-pump 4 mode, the two sets of refrigerating devices run in the pump 4 mode, and the value range of N is (-10, 10). The compressor 3 can adopt a variable frequency compressor 3 or a digital scroll compressor 3, the capacity of the compressor is adjustable, the maximum refrigerating capacity is generally 20% -30% larger than the nominal refrigerating capacity, the insufficient refrigerating capacity of a pump system can be compensated by a compressor system, the refrigerating capacity of the pump 4 reaches 70% -80% of that of the compressor 3, namely 1 compressor 3 and 1 pump 4 can be started, the system enters a single compressor 3+ single pump 4 mode, namely, one cooling device operates in the compressor 3 mode, and the other cooling device operates in the pump 4 mode. When the cooling capacity of the pump 4 is less than 70% of the capacity of the compressor 3, the pump 4 cannot be turned on again for precise control of the supply air temperature. That is, as shown in fig. 3, when the outdoor temperature T > M, the system enters the dual-compressor 3 mode, both sets of cooling devices operate in the compressor 3 mode, the value range of M is (-5, 20), and the value of M needs to be greater than that of N. Preferably, the operating temperature range for the single compressor 3+ single pump 4 mode is (0, 10). The cooling device is controlled to operate by adopting different working modes according to different external environments, so that the energy consumption of the cooling device is reduced, and the refrigeration efficiency is improved.

Preferably, the method further comprises:

when the received outdoor detection temperature is higher than a first set temperature, controlling the two compressors to operate or when the received outdoor detection temperature is lower than a second set temperature, controlling the two pumps to operate, and detecting the air supply temperature;

when the detected air supply temperature is greater than or equal to a first set air supply temperature and less than or equal to a second set air supply temperature, controlling a pump or a compressor to keep the original power output;

when the detected air supply temperature is higher than a second set air supply temperature, controlling a pump or a compressor to increase the output power;

and when the detected air supply temperature is lower than the first set air supply temperature, controlling the pump or the compressor to reduce the output power.

Specifically, as shown in the flowcharts of fig. 4 and 5, as shown in fig. 4, where b is the supply air temperature, R is the first set supply air temperature, and S is the second set supply air temperature; to ensure uniform supply air temperature, the two pumps 4 are controlled synchronously, with the same output. When the actual air supply temperature b is within the set setting range, namely R is more than or equal to b and less than or equal to S, the pump 4 is kept in an original state and does not act; when b is greater than S, the output of the pump 4 is increased, the refrigerating capacity is improved, and the air supply temperature is reduced; when b < R, the output of the pump 4 is reduced, the refrigerating capacity is reduced, the air supply temperature is increased, and the air supply temperature of the unit is controlled within a set range. The setting of R and S can be set according to the actual requirements of customers.

As shown in fig. 5, where b is the supply air temperature, R is the first set supply air temperature, and S is the second set supply air temperature; in order to ensure uniform supply air temperature, and in order to ensure uniform supply air temperature, the two compressors 3 are synchronously controlled and have the same output. When the actual air supply temperature b is within the set setting range, namely R is more than or equal to b and less than or equal to S, the compressor 3 is kept in an original state and does not act; when b is greater than S, the output of the compressor 3 is increased, the refrigerating capacity is improved, and the air supply temperature is reduced; when b < R, the output of the compressor 3 is reduced, the refrigerating capacity is reduced, the air supply temperature is increased, and the air supply temperature of the unit is controlled within a set range. The setting of R and S can be set according to the actual requirements of customers.

In addition, the method further comprises:

when the refrigeration demand is less than the set proportion, controlling a pump in a cooling device to operate, controlling the pump to keep the original power output when the detected air supply temperature is more than or equal to a first set air supply temperature and less than or equal to a second set air supply temperature, and controlling the pump to increase the output power when the detected air supply temperature is more than the second set air supply temperature; when the detected air supply temperature is lower than a first set air supply temperature, controlling the pump to reduce the output power;

when the refrigeration demand is larger than the set proportion, controlling a pump 4 in one cooling device to operate (the pump outputs 100% power), controlling a compressor 3 in the other cooling device to operate, controlling the compressor 3 to keep the original power output when the detected air supply temperature is larger than a first set air supply temperature and smaller than a second set air supply temperature, and controlling the compressor 3 to reduce the output power when the detected air supply temperature is larger than the second set air supply temperature; when the detected air supply temperature is lower than the first set air supply temperature, the compressor 3 is controlled to increase the output power.

Specifically, the flow chart shown in fig. 6 shows that when the heat load is small and the cooling demand is less than 50%, only 1 pump 4 is turned on, and the output of the pump 4 is adjusted according to the supply air temperature, that is: when the actual air supply temperature b is within the set setting range, namely R is more than or equal to b and less than or equal to S, the pump 4 is kept in an original state and does not act; when b is greater than S, the output of the pump 4 is increased, the refrigerating capacity is improved, and the air supply temperature is reduced; when b < R, the output of the pump 4 is reduced, the refrigerating capacity is reduced, the air supply temperature is increased, and the air supply temperature of the unit is controlled within a set range. The setting of R and S can be set according to the actual requirements of customers. When the refrigeration demand is more than or equal to 50%, starting 1 pump 4 and 1 compressor 3, outputting the pump 4 by 100%, adjusting the output of the compressor 3 according to the air supply temperature, and controlling the air supply temperature of the unit within a set range, namely: when the actual air supply temperature b is within the set setting range, namely R is more than or equal to b and less than or equal to S, the compressor 3 is kept in an original state and does not act; when b is greater than S, the output of the compressor 3 is increased, the refrigerating capacity is improved, and the air supply temperature is reduced; when b < R, the output of the compressor 3 is reduced, the refrigerating capacity is reduced, the air supply temperature is increased, and the air supply temperature of the unit is controlled within a set range. The setting of R and S can be set according to the actual requirements of customers.

By the control method, the working mode of the air conditioner can be accurately controlled, and the operation mode of the pump 4 is accurately controlled according to the detected outside temperature, so that the energy consumption of the air conditioner is reduced, and the refrigeration efficiency of the air conditioner is improved.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. An air conditioner, comprising:

2. The air conditioner according to claim 1, wherein the parameter is an outdoor temperature or a condensing pressure.

3. The air conditioner according to claim 2, wherein when the parameter is an outdoor temperature, the control device selectively controls the two pumps and the two compressors to operate according to a comparison result between the received parameter and a set threshold, specifically:

when the received outdoor detection temperature is less than or equal to a first set temperature and greater than or equal to a second set temperature, the magnitude of the refrigeration demand and the set proportion is compared, when the refrigeration demand is less than or equal to the set proportion, the pump in one cooling device is controlled to operate, when the refrigeration demand is greater than the set proportion, the pump in the one cooling device is controlled to operate, and the compressor in the other cooling device is controlled to operate.

4. The air conditioner according to claim 2, wherein when the parameter is an outdoor temperature, the control device selectively controls the two pumps and the two compressors to operate according to a comparison result between the received parameter and a set threshold, specifically:

and when the received outdoor detection temperature is lower than a second set temperature, controlling the two pumps to operate.

5. The air conditioner according to claim 2, wherein when the parameter is an outdoor temperature, the control device selectively controls the two pumps and the two compressors to operate according to a comparison result between the received parameter and a set threshold, specifically:

6. The air conditioner according to claim 5, further comprising a temperature detection device that detects a temperature of the supply air;

7. The air conditioner according to claim 3, further comprising a temperature detecting device that detects a temperature of the supply air; the control device is in signal connection with the temperature detection device, and the control device is further used for:

when the refrigeration demand is less than or equal to a set proportion, controlling a pump in a cooling device to operate, controlling the pump to keep original power output when the detected air supply temperature is greater than or equal to a first set air supply temperature and less than or equal to a second set air supply temperature, and controlling the pump to increase output power when the detected air supply temperature is greater than the second set air supply temperature; and when the detected air supply temperature is lower than a first set air supply temperature, controlling the pump to reduce the output power.

8. The air conditioner according to claim 3, further comprising a temperature detecting device that detects a temperature of the supply air; the control device is in signal connection with the temperature detection device, and the control device is further used for:

when the refrigeration demand is larger than a set proportion, controlling a pump in one cooling device to operate, controlling a compressor in the other cooling device to operate, and controlling the compressor to keep original power output when the detected air supply temperature is larger than or equal to a first set air supply temperature and smaller than or equal to a second set air supply temperature, and controlling the compressor to increase output power when the detected air supply temperature is larger than the second set air supply temperature; and when the detected air supply temperature is lower than a first set air supply temperature, controlling the compressor to reduce the output power.

9. The air conditioner according to claim 4, further comprising a temperature detecting device that detects a temperature of the supply air; the control device is in signal connection with the temperature detection device, and the control device is further used for:

10. The air conditioner according to any one of claims 6 to 9, wherein the evaporators of the two cooling devices are respectively communicated with the heat generating equipment through sealed passages; the detected air supply temperature is the air supply temperature in the sealed channel.

11. An air conditioner according to any one of claims 3 to 5, wherein the refrigeration apparatus further comprises a first bypass and/or a second bypass; wherein,

12. The air conditioner according to claim 11, wherein the control means is in signal connection with the first switching valve and controls the first switching valve to be closed when the pump is operated and to be opened when the compressor is operated; the control device is in signal connection with the second switch valve, and controls the second switch valve to be opened when the pump runs and controls the second switch valve to be closed when the compressor runs.

13. The air conditioner of claim 11, wherein said refrigeration unit further comprises a liquid reservoir disposed between said pump and said condenser.

14. A control method of an air conditioner according to claim 1, comprising the steps of:

detecting a parameter indicative of an outdoor environmental state;

15. The method for controlling an air conditioner according to claim 14, wherein when the parameter is an outdoor temperature, the two pumps and the two compressors are selectively controlled to operate according to a comparison result between the received parameter and a set threshold, specifically:

16. The method for controlling an air conditioner according to claim 14, wherein when the parameter is an outdoor temperature, the two pumps and the two compressors are selectively controlled to operate according to a comparison result between the received parameter and a set threshold, specifically:

17. The method for controlling an air conditioner according to claim 14, wherein when the parameter is an outdoor temperature, the two pumps and the two compressors are selectively controlled to operate according to a comparison result between the received parameter and a set threshold, specifically:

18. The control method of an air conditioner according to claim 17, further comprising detecting a temperature of the supply air;

19. The control method of an air conditioner according to claim 15, further comprising detecting a temperature of the supply air;

when the refrigeration demand is less than the set proportion, controlling a pump in a cooling device to operate, controlling the pump to keep the original power output when the detected air supply temperature is greater than or equal to a first set air supply temperature and less than or equal to a second set air supply temperature, and controlling the pump to increase the output power when the detected air supply temperature is greater than the second set air supply temperature; and when the detected air supply temperature is lower than a first set air supply temperature, controlling the pump to reduce the output power.

20. The control method of an air conditioner according to claim 15, further comprising detecting a temperature of the supply air;

21. The control method of an air conditioner according to claim 16, further comprising detecting a temperature of the supply air;