CN216347143U

CN216347143U - Machine room air conditioner and control device thereof

Info

Publication number: CN216347143U
Application number: CN202122768358.7U
Authority: CN
Inventors: 郭玉华; 李大伟; 谭超矿; 段洋
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-11-12
Filing date: 2021-11-12
Publication date: 2022-04-19
Anticipated expiration: 2031-11-12

Abstract

The utility model discloses a machine room air conditioner and a control device thereof, wherein the device comprises: the acquisition unit is configured to acquire a pressure value of a fluorine system of the first compressor, and the pressure value is recorded as a first high-pressure value; acquiring a pressure value of a fluorine system of a second compressor, and recording the pressure value as a second high-pressure value; and obtaining the outlet water temperature of the shell and tube condenser (11); a control unit configured to determine a condensing pressure value of the shell-and-tube condenser (11) from the first high pressure value and the second high pressure value; and the control unit is also configured to control the water regulating valve according to the condensation pressure value of the shell-and-tube condenser (11) and the outlet water temperature of the shell-and-tube condenser (11). According to the scheme, the double-fluorine system is adopted to share one condensation shell pipe water cooling system, so that the unit energy efficiency ratio of the machine room air conditioner can be improved.

Description

Machine room air conditioner and control device thereof

Technical Field

The utility model belongs to the technical field of air conditioners, particularly relates to a machine room air conditioner and a control device thereof, and particularly relates to a control device and method for a built-in shell and tube condenser of a machine room air conditioning unit and the machine room air conditioner.

Background

The air conditioner product of the machine room has strict limitation requirements on the size, and a product with optimal performance needs to be designed within the allowed maximum size range. The air conditioners in the machine room are generally divided into a fluorine circulation-air cooling series and a fluorine circulation-water cooling series from the system design, a shell and tube condenser is a design method in the fluorine circulation-water cooling series, and the shell and tube condenser is divided into an external condenser and an internal condenser. The external shell and tube condenser can increase certain material cost, installation cost, such as lengthening of pipelines, increase of circuit control panels and the like no matter in engineering installation or in the whole machine development process. Therefore, more and more customers are inclined to the design of an internal shell and tube condenser. However, the condenser with the built-in shell tube further occupies the internal space of the unit, which is not favorable for the structural assembly of the whole unit and the pipeline design of the whole unit, and also influences the air inlet area of the unit, thereby influencing the performance of the unit and being not favorable for improving the energy efficiency ratio of the unit.

The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a machine room air conditioner and a control device thereof, which are used for solving the problem that when a built-in shell and tube condenser is adopted by the machine room air conditioner, the air inlet area of a unit is influenced, and the energy efficiency ratio of the unit is further influenced, and the effect that the energy efficiency ratio of the unit of the machine room air conditioner can be improved by sharing one condensation shell and tube water cooling system by adopting a double-fluorine system is achieved.

The utility model provides a control device of a machine room air conditioner, wherein a double-fluorine system is adopted for the machine room air conditioner to share a built-in shell and tube condenser; the bifluoride system comprising: a first compressor fluorine system and a second compressor fluorine system; the first compressor fluorine system and the second compressor fluorine system are arranged independently and share the shell and tube condenser; the shell and tube condenser is provided with a cooling water outlet pipeline, and a water regulating valve is arranged on the cooling water outlet pipeline of the shell and tube condenser; the control device of the machine room air conditioner comprises: the acquisition unit is configured to acquire a pressure value of the first compressor fluorine system and record the pressure value as a first high-pressure value; acquiring a pressure value of the fluorine system of the second compressor, and recording the pressure value as a second high-pressure value; obtaining the outlet water temperature of the shell and tube condenser; a control unit configured to determine a condensing pressure value of the shell and tube condenser from the first high pressure value and the second high pressure value; the control unit is further configured to control the water regulating valve according to the condensation pressure value of the shell-and-tube condenser and the outlet water temperature of the shell-and-tube condenser.

In some embodiments, the first compressor fluorine system comprises: a heat exchanger, a compressor and a throttling element; the refrigerant outlet of the heat exchanger is communicated to the air suction port of the compressor through a first pipeline; an exhaust port of the compressor is communicated to a first refrigerant inlet of the shell and tube condenser through a second pipeline; a first refrigerant outlet of the shell and tube condenser is communicated to a refrigerant inlet of the heat exchanger through a third pipeline; the throttling element is arranged on the third pipeline.

In some embodiments, the throttling element comprises: a capillary tube and an electronic expansion valve; the capillary tube and the electronic expansion valve are arranged in parallel.

In some embodiments, the first compressor fluorine system, further comprising: an electric heater and an EC blower; wherein the electric heater is arranged between the heat exchanger and the EC fan.

In some embodiments, the first compressor fluorine system, further comprising: an electrode humidifier; the electrode humidifier is arranged between the electric heater and the EC fan.

In some embodiments, the second compressor fluorine system is structurally identical to the first compressor fluorine system.

In some embodiments, the first high pressure value is a pressure value in a pipeline communicated with a first refrigerant outlet of the shell-and-tube condenser; the second high-pressure value is a pressure value in a pipeline communicated with a second refrigerant outlet of the shell and tube condenser; and the outlet water temperature of the shell and tube condenser is the temperature in a pipeline communicated with a cooling water outlet of the shell and tube condenser.

In some embodiments, the control unit determining a condensing pressure value of the shell and tube condenser from the first high pressure value and the second high pressure value comprises: determining whether the first high pressure value is less than the second high pressure value; if the first high-pressure value is smaller than the second high-pressure value, determining that the first high-pressure value is a condensation pressure value of the shell-and-tube condenser under the condition that the second high-pressure value is smaller than a set high-pressure value; determining the second high-pressure value as the condensation pressure value of the shell-and-tube condenser under the condition that the second high-pressure value is greater than or equal to the set high-pressure value; if the first high-pressure value is greater than or equal to the second high-pressure value, determining that the second high-pressure value is the condensation pressure value of the shell-and-tube condenser under the condition that the first high-pressure value is less than a set high-pressure value; and determining the first high-pressure value as the condensation pressure value of the shell-and-tube condenser under the condition that the first high-pressure value is greater than or equal to a set high-pressure value.

In some embodiments, the controlling unit controls the water regulating valve according to a condensing pressure value of the shell-and-tube condenser and an outlet water temperature of the shell-and-tube condenser, and includes: after the machine room air conditioner is powered on, controlling the water regulating valve to execute a reset action; after the machine room air conditioner is powered on and the power-on time length is set, determining the initial opening degree of the water regulating valve according to the cooling water inlet temperature of the shell and tube condenser; wherein, the control unit determines the initial opening degree of the water regulating valve according to the cooling water inlet temperature of the shell and tube condenser, and comprises: determining the initial opening degree of the water regulating valve to be a first opening degree under the condition that the inlet water temperature of the cooling water of the shell-and-tube condenser is lower than the set inlet water temperature or the fault of a sensor of the inlet water temperature of the cooling water of the shell-and-tube condenser; determining the initial opening degree of the water regulating valve to be a second opening degree under the conditions that the inlet water temperature of the cooling water of the shell-and-tube condenser is greater than or equal to the set inlet water temperature and a sensor of the inlet water temperature of the cooling water of the shell-and-tube condenser fails; the second opening degree is larger than the first opening degree.

In some embodiments, the control unit controls the water regulating valve according to a condensing pressure value of the shell-and-tube condenser and an outlet water temperature of the shell-and-tube condenser, and further includes: under the condition that a compressor of the machine room air conditioner needs to be started, a cooling water pump of the machine room air conditioner is controlled to be started, the adjusting water valve is controlled to be fully opened, and after the starting time is set, the opening degree of the adjusting water valve is controlled to be a predetermined initial opening degree; determining whether the condensation pressure value is less than a set condensation pressure value; if the condensation pressure value is smaller than a set condensation pressure value, controlling the opening of the water regulating valve to keep the initial opening within the set running time of the opening of the compressor; then, controlling the water regulating valve according to the condensation pressure value and the water outlet temperature; and if the condensation pressure value is greater than or equal to a set condensation pressure value or the compressor is started for the set running time, controlling the water regulating valve according to the condensation pressure value and the water outlet temperature.

In some embodiments, the control unit, controlling the water regulating valve according to the condensation pressure value and the outlet water temperature, includes: if the condensation pressure value is smaller than a first set pressure value, controlling the regulating water valve to be closed according to a first set regulating period under the condition that the sensor of the outlet water temperature fails; under the condition that the sensor of the outlet water temperature is not in fault, if the outlet water temperature is lower than the set outlet water temperature, the regulating water valve is controlled to be closed according to a first set regulating period, and if the outlet water temperature is higher than or equal to the set outlet water temperature, the regulating water valve is controlled to be opened according to the first set regulating period; if the condensation pressure value is greater than or equal to a first set pressure value and less than a second set pressure value, controlling the opening of the water regulating valve to be unchanged under the condition that the sensor of the outlet water temperature fails; under the condition that the sensor of the outlet water temperature is not in fault, if the outlet water temperature is lower than the set outlet water temperature, the opening of the regulating water valve is controlled to be unchanged, and if the outlet water temperature is higher than or equal to the set outlet water temperature, the opening of the regulating water valve is controlled to be larger according to a first set regulating period;

if the condensation pressure value is greater than or equal to a second set pressure value and less than a third set pressure value, controlling the opening of the regulating water valve according to a first set regulation period under the condition that the sensor of the outlet water temperature fails; under the condition that the sensor of the outlet water temperature is not in fault, if the outlet water temperature is lower than the set outlet water temperature, the opening of the regulating water valve is controlled to be large according to a first set regulating period, and if the outlet water temperature is higher than or equal to the set outlet water temperature, the opening of the regulating water valve is controlled to be large according to the first set regulating period and the opening is greatly increased; if the condensation pressure value is greater than or equal to a third set pressure value and less than a fourth set pressure value, controlling the opening of the regulating water valve to be large according to a second set period; if the condensation pressure value is greater than or equal to a fourth set pressure value and less than a fifth set pressure value, controlling the opening of the water regulating valve to be large according to a third set period, and controlling the frequency rising amplitude of the compressor to be not greater than the set amplitude; if the condensation pressure value is greater than or equal to a fifth set pressure value and less than a sixth set pressure value, controlling the regulating water valve to be closed according to a third set period, and controlling the frequency reduction of the compressor; and if the condensation pressure value is greater than or equal to a fifth set pressure value and less than a sixth set pressure value, controlling the adjusting water valve to be fully opened, and controlling the frequency rising amplitude of the compressor not to be greater than the set amplitude.

In accordance with another aspect of the present invention, there is provided a machine room air conditioner including: the control device of the machine room air conditioner is described above.

Therefore, according to the scheme of the utility model, two independent compressor fluorine systems share one shell-tube condenser, the condensing pressure of the two independent compressor fluorine systems is collected, and the opening of the throttle valve is controlled according to the range of the condensing pressure and the outlet water temperature of the shell-tube condenser, so that the shell-tube condenser shared by the two independent compressor fluorine systems stably operates; therefore, the double-fluorine system is adopted to share one condensation shell pipe water cooling system, and the unit energy efficiency ratio of the machine room air conditioner can be improved.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

Fig. 1 is a schematic structural diagram of a control device of a machine room air conditioner according to an embodiment of the present invention;

fig. 2 is a schematic flow chart illustrating a control method of a room air conditioner according to an embodiment of the present invention;

FIG. 3 is a schematic flow chart illustrating one embodiment of the method of the present invention for determining the condensing pressure value of the shell and tube condenser;

FIG. 4 is a schematic flow chart illustrating an embodiment of determining an initial opening of a conditioning water valve before a machine room air conditioner is turned on according to the method of the present invention;

FIG. 5 is a schematic structural view of an embodiment of an external shell and tube condenser in a related aspect;

fig. 6 is a schematic structural diagram of an embodiment of a whole system of a machine room air conditioner;

FIG. 7 is a schematic flow chart of an embodiment of a condensing pressure value taking method;

FIG. 8 is a flow chart illustrating an embodiment of a two-way valve control method.

The reference numbers in the embodiments of the present invention are as follows, in combination with the accompanying drawings:

11-shell and tube condenser; 21-a first evaporator; 22-a second evaporator; 3-an electric heater; 4-electrode humidifier; 5-EC fan; 6-a compressor; 61-compressor heating belt; 62-a high voltage switch; 63-two-way water regulating valve; 64-a water flow switch; 7-an electronic expansion valve; 71-an electronic expansion valve coil; 8-capillary (i.e., parallel capillary); 81-exhaust temperature sensing bulb; 82-a low pressure sensor; 83-evaporator outlet pipe temperature sensing bulb; 84-evaporator inlet tube temperature sensing bulb; 85-high pressure sensor; 86-water outlet temperature sensing bag; 87-water inlet temperature sensing bulb; 88-air supply temperature and humidity sensor; 89-water leakage induction line; 9-return air temperature and humidity sensor; 91-wind pressure sensor.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

According to an embodiment of the present invention, there is provided a control apparatus of a machine room air conditioner. Referring to fig. 1, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The machine room air conditioner adopts a double-fluorine system to share a built-in shell and tube condenser 11. The bifluoride system comprising: a first compressor fluorine system and a second compressor fluorine system. A first compressor fluorine system such as system 1 and a second compressor fluorine system such as system 2. The first compressor fluorine system and the second compressor fluorine system are arranged independently of each other and share the shell and tube condenser 11. The shell and tube condenser 11 is provided with a cooling water outlet pipeline, and a water regulating valve, such as a two-way water regulating valve 63, is arranged on the cooling water outlet pipeline of the shell and tube condenser 11.

In the scheme of the utility model, the machine room air conditioner can be a lower air supply unit, and the air outlet can be arranged at the bottom.

Fig. 5 is a schematic structural view of an embodiment of an external shell-and-tube condenser in a related aspect. In the external shell-and-tube condenser shown in fig. 5, a condensing inlet pipe is connected to a condensing inlet end of the shell-and-tube condenser. And the condensation inlet pipe is provided with a compressor exhaust temperature sensing bulb. And a water outlet of the shell and tube condenser is communicated to a water inlet end of the cooling tower through a cooling water outlet pipe. And a cooling water outlet pipe is provided with a water outlet temperature sensing bulb and a flow regulating valve. The water outlet end of the cooling tower is communicated to the water inlet of the shell and tube condenser after passing through the cooling water inlet pipe. And a water pump, a water flow switch and a water inlet temperature sensing bulb are arranged on the cooling water inlet pipe. And the condensation outlet end of the shell and tube condenser is communicated to a condensation output pipe. And a condensation pressure sensor is arranged on the condensation output pipe.

In the related art, the condenser is generally an external shell-and-tube condenser, and the fluorine circulation system and the water circulation system are controlled in a one-to-one manner, as shown in fig. 5.

Compared with the design of a fluorine circulation system and a water circulation system one-to-one control system, the utility model provides a brand-new reliable control scheme of the built-in shell and tube condenser with low cost, adopts the double-fluorine system to share one built-in shell and tube condenser, can meet the strict limitation on the unit size under the specific cold quantity condition, is more beneficial to improving the energy efficiency ratio of the unit, and reduces the design cost. Therefore, copper pipes can be saved, and the installation cost is saved. The installation is convenient in engineering. The pipelines are reduced, the resistance of the waterway system is reduced, and the energy efficiency ratio of the unit is favorably improved. The parts such as a two-way regulating valve and the like are reduced, and the development cost of the whole machine is reduced.

Specifically, in the scheme of the utility model, two independent compressor fluorine systems share one shell-and-tube condenser, and the opening degree of the throttle valve is controlled by certain condensing pressure acquisition logic and combining the outlet water temperature. Collecting condensation pressure of two independent compressor fluorine systems to take values according to a certain condition, and formulating a corresponding throttle valve opening degree control criterion according to the range of the condensation pressure value and the outlet water temperature, thereby realizing the purpose that the two systems share one shell and tube condenser to stably operate.

In some embodiments, the first compressor fluorine system comprises: a heat exchanger (such as the first evaporator 21), a compressor 6 and a throttling element.

The refrigerant outlet of the heat exchanger is communicated to the suction port of the compressor 6 through a first pipeline. An exhaust port of the compressor 6 is communicated to a first refrigerant inlet of the shell-and-tube condenser 11 through a second pipeline. And a first refrigerant outlet of the shell and tube condenser 11 is communicated to a refrigerant inlet of the heat exchanger through a third pipeline.

The throttling element is arranged on the third pipeline.

In some embodiments, the throttling element comprises: a capillary tube 8 and an electronic expansion valve 7. The capillary tube 8 and the electronic expansion valve 7 are arranged in parallel.

In some embodiments, the first compressor fluorine system, further comprising: an electric heater 3 and an EC fan 5. Wherein the electric heater 3 is arranged between the heat exchanger and the EC fan 5.

In some embodiments, the first compressor fluorine system, further comprising: an electrode humidifier 4. The electrode humidifier 4 is disposed between the electric heater 3 and the EC blower 5.

Fig. 6 is a schematic structural diagram of an embodiment of a whole system of a machine room air conditioner. As shown in fig. 6, the whole system of the air conditioner in the machine room includes: the device comprises a shell and tube condenser 11, a first evaporator 21, a second evaporator 22, an electric heater 3, an electrode humidifier 4, an EC fan 5, a compressor 6, a compressor heating belt 61, a high-pressure switch 62, a two-way water regulating valve 63, a water flow switch 64, an electronic expansion valve 7, an electronic expansion valve coil 71, a capillary tube (namely a capillary tube connected in parallel) 8, an exhaust temperature sensing bulb 81, a low-pressure sensor 82, an evaporator outlet tube temperature sensing bulb 83, an evaporator inlet tube temperature sensing bulb 84, a high-pressure sensor 85, an outlet water temperature sensing bulb 86, an inlet water temperature sensing bulb 87, an air supply temperature and humidity sensor 88, a water leakage sensing wire 89, an air return temperature and humidity sensor 9 and an air pressure sensor 91.

In a two compressor fluorine system, system 1 comprises: the device comprises a first evaporator 21, an electric heater 3, an electrode humidifier 4, an EC fan 5, a compressor 6, a compressor heating belt 61, a high-voltage switch 62, an electronic expansion valve 7, an electronic expansion valve coil 71, a capillary tube (namely a parallel capillary tube) 8, an exhaust temperature sensing bulb 81, a low-voltage sensor 82, an evaporator outlet tube temperature sensing bulb 83, an evaporator inlet tube temperature sensing bulb 84, a high-voltage sensor 85, an air supply temperature and humidity sensor 88, a water leakage induction wire 89, an air return temperature and humidity sensor 9 and an air pressure sensor 91. The system 2 comprises: the system comprises a second evaporator 22, an electric heater 3, an EC fan 5, a compressor 6, a compressor heating belt 61, a high-voltage switch 62, an electronic expansion valve 7, an electronic expansion valve coil 71, a capillary tube (namely a parallel capillary tube) 8, an exhaust temperature sensing bulb 81, a low-voltage sensor 82, an evaporator outlet tube temperature sensing bulb 83, an evaporator inlet tube temperature sensing bulb 84, a high-voltage sensor 85, an air supply temperature and humidity sensor 88, a water leakage induction wire 89, an air return temperature and humidity sensor 9 and an air pressure sensor 91.

In the system 1, a first end of the first evaporator 21 is connected to an intake of the compressor 6 through a first pipe. On the first pipe, an evaporator outlet pipe bulb 83 and a low pressure sensor 82 are provided. The discharge port of the compressor 6 is connected to the first inlet end of the shell-and-tube condenser 11 through a second pipe. On a second pipe between the discharge port of the compressor 6 to the first inlet end of the shell-and-tube condenser 11, a discharge bulb 81 and a high-pressure switch 62 are provided. The first outlet end of the shell-and-tube condenser 11 is connected to the second end of the second evaporator 22 through a third line. In the third line between the first outlet end of the shell-and-tube condenser 11 and the second end of the second evaporator 22, a high-pressure sensor 85, a capillary tube 8 and an evaporator inlet bulb 84 are provided. In parallel with the capillary tube 8, an electronic expansion valve 7 is arranged. The electronic expansion valve 7 has an electronic expansion valve coil 71.

In the system 1, the system 1 has the same configuration as the system 2 except for the electrode humidifier 4.

And the shell and tube condenser 11 is respectively communicated with the system 1 and the system 2 through pipelines. A cooling water outlet pipe and a cooling water inlet pipe are also arranged on the shell and tube condenser 11. The cooling water outlet pipe is provided with an outlet temperature sensing bulb 86 and a two-way water regulating valve 63. A water flow switch 64 and a water inlet temperature sensing bulb 87 are arranged on the cooling water inlet pipe.

In the system block diagram of the unit control shown in fig. 6, two compressor fluorine systems share one shell-and-tube condenser 11, and the shell-and-tube condenser 11 controls the amount of cooling water flow through a two-way regulating valve (i.e., the two-way regulating water valve 63), so as to determine the heat exchange capacity of the shell-and-tube condenser 11. Under a certain stable working condition, the operation frequency of the compressor 6 is increased, so that the condensing pressure (the pressure detected by the high-pressure sensor 85) of the system is increased, and at the moment, the cooling water flow is increased to ensure the heat exchange amount so as to keep the system to stably operate, so that the shutdown caused by high-pressure protection is avoided. When the cooling water temperature was higher, the heat transfer effect can worsen, also need increase discharge this moment and guarantee the heat transfer volume and then keep system steady operation, was unlikely to appear high pressure protection and shut down.

The control device of the machine room air conditioner comprises: the device comprises a collecting unit and a control unit.

Wherein, the collecting unit is configured to obtain a pressure value of the first compressor fluorine system, which is recorded as a first high pressure value, such as a first high pressure value P1. And acquiring a pressure value of the fluorine system of the second compressor, and recording the pressure value as a second high-pressure value, such as a second high-pressure value P2. And acquiring the outlet water temperature of the shell and tube condenser 11, specifically acquiring the outlet water temperature at the cooling water outlet of the shell and tube condenser 11, such as the water outlet problem Tout.

The first high-pressure value is a pressure value in a pipeline communicated with the first refrigerant outlet of the shell-and-tube condenser 11.

The second high-pressure value is a pressure value in a pipeline communicated with the second refrigerant outlet of the shell-and-tube condenser 11. And a second refrigerant outlet of the shell and tube condenser 11 is communicated to the second compressor fluorine system.

The outlet water temperature of the shell-and-tube condenser 11 is the temperature in a pipeline communicated with a cooling water outlet of the shell-and-tube condenser 11.

A control unit configured to determine a condensing pressure value, such as a condensing pressure Px, of the shell-and-tube condenser 11 based on the first high pressure value and the second high pressure value.

In some embodiments, the determining, by the control unit, a condensing pressure value, such as a condensing pressure Px, of the shell-and-tube condenser 11 based on the first high pressure value and the second high pressure value includes:

the control unit is specifically further configured to determine whether the first high pressure value is less than the second high pressure value.

The control unit is specifically further configured to determine that the first high-pressure value is the condensation pressure value of the shell-and-tube condenser 11 when the second high-pressure value is smaller than a set high-pressure value if the first high-pressure value is smaller than the second high-pressure value. And determining the second high-pressure value as the condensation pressure value of the shell-and-tube condenser 11 under the condition that the second high-pressure value is greater than or equal to the set high-pressure value.

The control unit is specifically configured to determine that the second high-pressure value is the condensation pressure value of the shell-and-tube condenser 11 when the first high-pressure value is smaller than a set high-pressure value if the first high-pressure value is greater than or equal to the second high-pressure value. And determining the first high-pressure value as the condensation pressure value of the shell-and-tube condenser 11 under the condition that the first high-pressure value is greater than or equal to the set high-pressure value.

FIG. 7 is a schematic flow chart of an embodiment of a condensing pressure value taking method. As shown in fig. 7, the condensing pressure value taking method includes:

and 11, electrifying the unit, and acquiring pressure values of the high-pressure sensors 85 of the two fluorine systems by the microcontroller to obtain a first high-pressure value P1 and a second high-pressure value P2. Two fluorine systems comprising: a first fluorine system, such as system 1, and a second fluorine system, such as system 2. The pressure value of the system 1 is the first high pressure value P1, and the pressure value of the system 2 is the second high pressure value P2.

Step 12, judging whether the first high-pressure value P1 of the system 1 is smaller than the second high-pressure value P2 of the system 2: if yes, go to step 21. Otherwise, step 31 is executed.

Step 21, determining whether the second high pressure value P2 of the system 2 is smaller than a set pressure value, such as 3000 KPa: if yes, go to step 22. Otherwise, step 23 is executed.

And step 22, taking the control pressure value Px of the condensing shell and tube (namely the shell and tube condenser 11) as a first high-pressure value P1.

Step 23, determining whether the first high pressure value P1 of the system 1 is greater than a set pressure value, such as 3000 KPa: if yes, go to step 24. Otherwise, step 25 is performed.

And 24, taking the control pressure value Px of the condensing shell and tube (namely the shell and tube condenser 11) as a second high-pressure value P2.

And step 25, taking the control pressure value Px of the condensing shell and tube (namely the shell and tube condenser 11) as a second high-pressure value P2.

The principle of the pressure value is that when the first high-pressure value and the second high-pressure value are both smaller than a set pressure value, the smaller pressure value of the first high-pressure value and the second high-pressure value is taken as a control pressure PX; and when at least one of the first high-pressure value and the second high-pressure value is higher than the set pressure value, taking the larger pressure value of the first high-pressure value and the second high-pressure value as the control pressure PX.

Step 31, judging whether the first high pressure value P1 of the system 1 is smaller than a set pressure value such as 3000 KPa: if yes, go to step 32. Otherwise, step 33 is executed.

And step 32, taking the control pressure value Px of the condensing shell and tube (namely the shell and tube condenser 11) as a second high-pressure value P2.

Step 33, determining whether the second high pressure value P2 of the system 2 is greater than a set pressure value, such as 3000 KPa: if so, step 34 is performed. Otherwise, step 35 is executed.

And step 34, taking the control pressure value Px of the condensing shell and tube (namely the shell and tube condenser 11) as a first high-pressure value P1.

And step 35, taking the control pressure value Px of the condensing shell and tube (namely the shell and tube condenser 11) as a first high-pressure value P1.

In the example shown in fig. 7, the condensing pressure Px, i.e., the control pressure value Px of the shell-and-tube condenser 11, refers to the pressure detected by the high-pressure sensor 85. The reference value of the condensing pressure Px is selected for the control of the two-way regulating valve (i.e., the cooling water valve, such as the two-way regulating water valve 63).

The utility model provides a novel control method suitable for heat exchange of a condensation shell tube shared by a plurality of independent compressor fluorine systems, which is characterized in that condensation pressure values of a plurality of systems are taken, the method is used for calculating according to the scheme of the utility model, and the opening degree of a throttle valve is controlled according to a certain rule by combining the outlet water temperature of a condenser, so that the aim of stable operation of the plurality of systems is fulfilled.

The control unit is further configured to control the water regulating valve, such as the two-way water regulating valve 63, according to the condensing pressure value of the shell-and-tube condenser 11 and the outlet water temperature of the shell-and-tube condenser 11. Specifically, the control logic of the two-way regulating valve of the machine room air conditioner is determined according to the condensing pressure of the shell-and-tube condenser 11 and the water outlet temperature of the shell-and-tube condenser 11, the two-way regulating valve is controlled according to the determined control logic, so that the double fluorine systems share one condensing shell-and-tube water cooling system, the flow rate of cooling water is controlled through the one two-way regulating valve, and the heat exchange effects of the two fluorine systems are balanced.

In some embodiments, the controlling unit controls the water regulating valve according to the condensing pressure value of the shell-and-tube condenser 11 and the outlet water temperature of the shell-and-tube condenser 11, and includes: the process of determining the initial opening of the adjusting water valve before the air conditioner of the machine room is started comprises the following specific steps:

the control unit is specifically configured to control the water regulating valve to perform a reset action, that is, to fully open and then fully close, after the machine room air conditioner is powered on before the compressor 6 of the machine room air conditioner is started.

The control unit is specifically configured to determine the initial opening of the water regulating valve according to the inlet water temperature of the cooling water of the shell-and-tube condenser 11 after the machine room air conditioner is powered on for a set power-on time period. The cooling water inlet temperature of the shell and tube condenser 11 is the temperature in the pipeline where the cooling water inlet of the shell and tube condenser 11 is located.

Wherein, the control unit determines the initial opening of the water regulating valve according to the inlet water temperature of the cooling water of the shell and tube condenser 11, and includes the following two determination conditions:

the first determination case: the control unit is specifically configured to determine that the initial opening degree of the water regulating valve is the first opening degree when the inlet water temperature of the cooling water of the shell-and-tube condenser 11 is lower than the set inlet water temperature or the fault of the sensor of the inlet water temperature of the cooling water of the shell-and-tube condenser 11.

Second determination case: the control unit is specifically configured to determine that the initial opening degree of the water regulating valve is the second opening degree when the inlet water temperature of the cooling water of the shell and tube condenser 11 is greater than or equal to the set inlet water temperature and the sensor of the inlet water temperature of the cooling water of the shell and tube condenser 11 has not failed. The second opening degree is larger than the first opening degree.

FIG. 8 is a flow chart illustrating an embodiment of a two-way valve control method. As shown in fig. 8, the two-way regulating valve control method includes:

and 41, electrifying the unit, and executing the reset action of the cooling water valve (such as the two-way regulating water-saving valve 63) by fully opening and then fully closing.

That is to say, after the whole machine is powered on, the reset action of the cooling water valve is executed, the cooling water valve is adjusted to be fully opened and then is adjusted to be fully closed, so as to check whether the cooling water valve is blocked or fails.

And 42, after the set power-on time of the unit is set to be 2 minutes, determining the initial opening degree of the cooling water valve according to the water inlet temperature Tin of the cooling water (the temperature value collected by the water inlet temperature sensing bag 87).

Step 43, judging whether the cooling water inlet temperature Tin is less than 25 ℃ or not, or whether the cooling water inlet temperature sensor has a fault: if the temperature of the cooling water is lower or the cooling water inlet temperature sensing bulb is in fault, the initial opening of the cooling water valve is fixed to be 50%. Otherwise, namely when the inlet water temperature of the cooling water is higher, the initial opening degree of the cooling water valve is fixed to 100 percent.

It should be noted that, in the scheme of the utility model, the lower and higher defining values of the cooling water temperature are better empirical values obtained by experimental tests at 25 ℃, and the values can be obtained in the vicinity of the higher defining values. The values of the initial opening degree of the cooling water valve in different temperature ranges are also better experience values obtained through experimental tests, and the values can be near the optimal experience values. In the scheme of the utility model, the selection of the defined value is a better empirical value obtained by experimental tests, and is not described in detail later.

In some embodiments, the controlling unit controls the water regulating valve according to the condensing pressure value of the shell-and-tube condenser 11 and the outlet water temperature of the shell-and-tube condenser 11, and further includes: the process of controlling the water regulating valve after the compressor is started comprises the following specific steps:

the control unit is specifically configured to control a cooling water pump of the machine room air conditioner to be opened and control the adjusting water valve to be fully opened under the condition that the compressor 6 of the machine room air conditioner has an opening requirement, and after the opening duration is set, control the opening degree of the adjusting water valve to be a predetermined initial opening degree.

The control unit is specifically further configured to determine whether the condensation pressure value is less than a set condensation pressure value.

The control unit is specifically configured to control the opening degree of the water regulating valve to maintain the initial opening degree within a set operation time for turning on the compressor 6 if the condensation pressure value is smaller than a set condensation pressure value. And then, controlling the water regulating valve according to the condensation pressure value and the water outlet temperature.

The control unit is specifically configured to control the water regulating valve according to the condensation pressure value and the outlet water temperature if the condensation pressure value is greater than or equal to a set condensation pressure value or after the compressor 6 is started for the set operation time.

As shown in fig. 8, the two-way regulating valve control method further includes:

step 44, the unit judges whether to start the compressor 6 according to the actual operation condition: if the compressor 6 has an on-demand, step 45 is executed. Otherwise, return to step 43.

Wherein the compressor turn-on condition is reached at higher ambient temperatures. For example, the set demand temperature is 25 ℃, the actual ambient temperature is 30 ℃, and the compressor is started to refrigerate at this time.

And step 45, firstly ensuring the smoothness of the cooling water circulation system, starting the cooling water pump, fully opening the cooling water valve, and adjusting to the corresponding initial opening degree according to the inlet water temperature of the cooling water after 30 seconds.

The initial opening is determined according to the temperature of inlet water, and the cooling water valve realizes automatic opening adjustment through a control command sent by the control unit. The opening degree of the cooling water valve is described in percentage, and the linear corresponding relation is that full opening represents 100% opening degree, full closing represents 0% opening degree, and half opening represents 50% opening degree.

For example: when the water inlet temperature is lower than 15 ℃, the corresponding initial opening degree of the cooling water valve is 25%; for example, when the temperature of the inlet water is between 15 and 25 ℃, the opening degree of the corresponding cooling water valve is 50 percent; for example, when the temperature of the inlet water is 25-35 ℃, the initial opening degree of the corresponding cooling water valve is 75%; for example, when the temperature of the inlet water is higher than 35 ℃, the initial opening degree of the corresponding cooling water valve is 100%. According to the heat exchange, the larger the temperature difference between two media is, the better the heat exchange effect is. Therefore, the lower the water inlet temperature of the refrigerant in the shell and tube condenser after the compressor is started is, the better the heat exchange effect is, and the water inlet amount is not required to be large. On the contrary, when the water inlet temperature is high, the water inlet amount needs to be increased.

And step 46, after the compressor 6 is started, controlling the opening degree of the cooling water valve according to the sampled value Px of the condensing pressure (namely the control pressure value of the shell-and-tube condenser 11).

The value of Px is very critical in the solution of the present invention, see fig. 7, Px is calculated from the pressure values of the two fluorine systems, and when neither exceeds 3000KPa, Px is the smaller of the two. When both exceed 3000KPa, Px takes the larger of the two. When the difference between the two is large, the condensing pressure of one system is more than 3000KPa, and the condensing pressure of the other system is less than 3000KPa, the maximum value of Px is taken.

In step 46, it is also determined whether the condensing pressure Px is less than 2500 KPa: when the condensing pressure Px is less than 2500KPa, the compressor 6 is started for 1 minute, the initial opening is kept unchanged, and the opening of the cooling water valve is adjusted according to the condensing pressure and the effluent temperature after 1 minute. When the condensing pressure Px is greater than or equal to 2500KPa or the compressor 6 runs for 1 minute, directly starting to adjust the opening of the cooling water valve according to the condensing pressure and the effluent temperature.

In some embodiments, the control unit controls the water regulating valve according to the condensation pressure value and the outlet water temperature, and includes any one of the following control conditions:

the first control case: the control unit is specifically configured to control the regulating water valve to be closed in a first set regulating period under the condition that the sensor of the outlet water temperature fails if the condensation pressure value is smaller than a first set pressure value. And under the condition that the sensor of the outlet water temperature is not in fault, if the outlet water temperature is less than the set outlet water temperature, the regulating water valve is controlled to be closed according to a first set regulating period, and if the outlet water temperature is greater than or equal to the set outlet water temperature, the regulating water valve is controlled to be opened according to the first set regulating period. The first set pressure value is 1900 KPa.

The second control case: the control unit is specifically configured to control the opening of the water regulating valve to be unchanged under the condition that the sensor of the outlet water temperature fails if the condensation pressure value is greater than or equal to a first set pressure value and less than a second set pressure value. And under the condition that the sensor of the outlet water temperature is not in fault, if the outlet water temperature is lower than the set outlet water temperature, controlling the opening of the regulating water valve to be unchanged, and if the outlet water temperature is higher than or equal to the set outlet water temperature, controlling the opening of the regulating water valve to be larger according to a first set regulating period. The second set pressure value is 2300 KPa.

The third control case: the control unit is specifically configured to control the adjusting water valve to be opened greatly according to a first set adjusting period under the condition that the sensor of the outlet water temperature is in fault if the condensation pressure value is greater than or equal to a second set pressure value and less than a third set pressure value. And under the condition that the sensor of the outlet water temperature has no fault, if the outlet water temperature is less than the set outlet water temperature, controlling the opening of the regulating water valve according to a first set regulating period, and if the outlet water temperature is more than or equal to the set outlet water temperature, controlling the opening of the regulating water valve according to the first set regulating period and increasing the opening by a large margin. The third set pressure value is 2600 KPa.

Fourth control case: the control unit is specifically configured to control the opening of the water regulating valve to be larger according to a second set period if the condensation pressure value is greater than or equal to a third set pressure value and smaller than a fourth set pressure value. The fourth set pressure value is 2600 KPa.

Fifth control case: the control unit is specifically configured to control the opening of the water regulating valve to be large according to a third set period and control the frequency increasing amplitude of the compressor 6 to be not greater than a set amplitude if the condensation pressure value is greater than or equal to a fourth set pressure value and less than a fifth set pressure value. A fifth set pressure value, such as 3300 KPa.

Sixth control case: the control unit is specifically configured to control the water regulating valve to be closed down according to a third set period and control the frequency reduction of the compressor 6 if the condensation pressure value is greater than or equal to a fifth set pressure value and less than a sixth set pressure value. The sixth set pressure value is, for example, 3500 KPa.

The seventh control case: the control unit is specifically configured to control the adjusting water valve to be fully opened and control the frequency rising amplitude of the compressor 6 to be not greater than a set amplitude if the condensation pressure value is greater than or equal to a fifth set pressure value and less than a sixth set pressure value.

and step 47, when the condensing pressure Px is less than 1900KPa, if the cooling water outlet temperature sensing bulb fails, the cooling water valve is only closed and not opened, and the adjusting period is 1 minute/time.

It should be noted that the standard amplitude of each adjustment of the cooling water valve is 2%, and will not be described in detail later. When the cooling water outlet temperature sensing bulb is normal, if the outlet water temperature Tout is less than 50 ℃, the cooling water valve is only closed and is not opened, and the adjusting period is 1 minute/time. If the outlet water temperature Tout is more than or equal to 50 ℃, the cooling water valve is only opened big but not closed small, and the adjusting period is 1 minute/time. When the condensing pressure Px is not less than 1900KPa, step 48 is performed.

And 48, when the condensing pressure Px is smaller than 2300KPa, if the cooling water outlet temperature sensing bulb is in fault, keeping the opening of the cooling water valve unchanged. When the cooling water outlet temperature sensing bulb is normal, if the outlet water temperature Tout is less than 50 ℃, the opening degree of the cooling water valve is kept unchanged. If the outlet water temperature Tout is more than or equal to 50 ℃, the cooling water valve is only opened big but not closed small, and the adjusting period is 1 minute/time. When the condensing pressure Px is not less than 2300KPa, step 49 is performed.

And 49, when the condensing pressure Px is less than 2600KPa, if the cooling water outlet temperature sensing package is in fault, the cooling water valve is opened only greatly but not closed, and the adjusting period is 1 minute/time. When the cooling water outlet temperature sensing bulb is normal, if the outlet water temperature Tout is less than 50 ℃, the cooling water valve is opened only greatly but not closed little, and the adjusting period is 1 minute/time. If the outlet water temperature Tout is more than or equal to 50 ℃, the cooling water valve is only opened big but not closed small, the adjusting amplitude is doubled, and the adjusting period is 1 minute/time. When the condensing pressure Px is not less than 2600KPa, step 50 is performed.

And step 50, when the condensing pressure Px is less than 3000KPa, opening the cooling water valve only and not closing the cooling water valve, wherein the adjusting period is 30 seconds/time. When the condensing pressure Px is not less than 3000KPa, step 51 is performed.

And step 51, when the condensing pressure Px is less than 3300KPa, opening the cooling water valve only and not closing the cooling water valve, wherein the adjusting period is 15 seconds/time, and the frequency of the compressor is not more than 2HZ every time. When the condensing pressure Px is not less than 3300KPa, step 52 is performed.

And step 52, when the condensing pressure Px is less than 3500KPa, the cooling water valve is only opened but not closed, the adjusting period is 15 seconds/time, and the compressor only allows frequency reduction but not frequency increase. When the condensing pressure Px is not less than 3500KPa, step 53 is performed.

And step 53, when the condensing pressure Px is greater than or equal to 3500KPa, adjusting the cooling water valve to a full-open state (100% open), and forcibly reducing the frequency by 2HZ by frequency adjustment of the compressor 6 every time.

In the example shown in fig. 8, the main variables involved in the control of the two-way regulating valve (i.e., the cooling water valve, such as the two-way regulating water valve 63) are the condensing pressure Px (which indicates the pressure detected by the high-pressure sensor) and the outlet water temperature Tout (which indicates the temperature detected by the water temperature sensing bulb 86), and the control of the two-way regulating valve is determined by the comprehensive judgment of the two.

In the above embodiment, the condensing pressures of the two systems are adopted to take values according to the required rule, and the opening amplitude and the adjusting period of the cooling water valve are adjusted by combining the outlet water temperature of the cooling water. The exhaust temperature of the compressor can be used for replacing the outlet temperature of the cooling water to set a corresponding rule, and if no condensation pressure exists, the control of the cooling water valve can be realized by combining the outlet temperature of the cooling water and the exhaust temperature of the compressor.

The scheme of the utility model provides a new control method for a built-in condensing shell pipe, a set of brand-new two-way throttle valve control logic is formulated, the double fluorine systems share one condensing shell pipe water cooling system, and the cooling water flow is controlled by one two-way regulating valve to balance the heat exchange effect of the two fluorine systems. The method is beneficial to reducing pipelines, reducing the installation cost, reducing the resistance of a water system and improving the energy efficiency ratio of the unit.

By adopting the technical scheme of the utility model, the two independent compressor fluorine systems share one shell-tube condenser, the condensing pressure of the two independent compressor fluorine systems is collected, and the opening of the throttle valve is controlled according to the range of the condensing pressure and the water outlet temperature of the shell-tube condenser, so that the shell-tube condenser shared by the two independent compressor fluorine systems stably operates. Therefore, the double-fluorine system is adopted to share one condensation shell pipe water cooling system, and the unit energy efficiency ratio of the machine room air conditioner can be improved.

According to an embodiment of the present invention, there is also provided a machine room air conditioner corresponding to a control device of the machine room air conditioner. The machine room air conditioner may include: the control device of the machine room air conditioner is described above.

Since the processing and functions of the air conditioner in the room of this embodiment are basically corresponding to the embodiments, principles and examples of the foregoing devices, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment.

By adopting the technical scheme of the utility model, the two independent compressor fluorine systems share one shell-tube condenser, the condensing pressure of the two independent compressor fluorine systems is acquired, the opening of the throttle valve is controlled according to the range of the condensing pressure and the water outlet temperature of the shell-tube condenser, so that the shell-tube condenser shared by the two independent compressor fluorine systems stably operates, the pipelines are favorably reduced, the installation cost is reduced, the resistance of a water system is reduced, and the energy efficiency ratio of a unit is improved.

According to an embodiment of the present invention, a method for controlling a machine room air conditioner corresponding to the machine room air conditioner is also provided, as shown in fig. 2, which is a schematic flow chart of an embodiment of the method of the present invention. The control method of the machine room air conditioner can comprise the following steps: step S110 to step S130.

At step S110, a pressure value of the first compressor fluorine system is obtained and recorded as a first high pressure value, such as a first high pressure value P1. And acquiring a pressure value of the fluorine system of the second compressor, and recording the pressure value as a second high-pressure value, such as a second high-pressure value P2. And acquiring the outlet water temperature of the shell and tube condenser 11, specifically acquiring the outlet water temperature at the cooling water outlet of the shell and tube condenser 11, such as the water outlet problem Tout.

At step S120, a condensing pressure value, such as a condensing pressure Px, of the shell-and-tube condenser 11 is determined based on the first high pressure value and the second high pressure value.

In some embodiments, the specific procedure of determining the condensing pressure value, such as the condensing pressure Px, of the shell-and-tube condenser 11 in step S120 based on the first high pressure value and the second high pressure value, is as follows for exemplary description.

The specific process of determining the condensing pressure value of the shell-and-tube condenser 11 in step S120 will be further described with reference to a schematic flow chart of an embodiment of determining the condensing pressure value of the shell-and-tube condenser 11 in the method of the present invention shown in fig. 3, which includes: step S210 to step S230.

Step S210, determining whether the first high pressure value is smaller than the second high pressure value.

Step S220, if the first high pressure value is smaller than the second high pressure value, determining that the first high pressure value is the condensation pressure value of the shell-and-tube condenser 11 when the second high pressure value is smaller than a set high pressure value. And determining the second high-pressure value as the condensation pressure value of the shell-and-tube condenser 11 under the condition that the second high-pressure value is greater than or equal to the set high-pressure value.

In step S230, if the first high pressure value is greater than or equal to the second high pressure value, the second high pressure value is determined to be the condensation pressure value of the shell-and-tube condenser 11 when the first high pressure value is less than the set high pressure value. And determining the first high-pressure value as the condensation pressure value of the shell-and-tube condenser 11 under the condition that the first high-pressure value is greater than or equal to the set high-pressure value.

In step S130, the water regulating valve, such as the two-way water regulating valve 63, is controlled according to the condensing pressure value of the shell-and-tube condenser 11 and the outlet water temperature of the shell-and-tube condenser 11. Specifically, the control logic of the two-way regulating valve of the machine room air conditioner is determined according to the condensing pressure of the shell-and-tube condenser 11 and the water outlet temperature of the shell-and-tube condenser 11, the two-way regulating valve is controlled according to the determined control logic, so that the double fluorine systems share one condensing shell-and-tube water cooling system, the flow rate of cooling water is controlled through the one two-way regulating valve, and the heat exchange effects of the two fluorine systems are balanced.

In some embodiments, the controlling the water regulating valve according to the condensing pressure value of the shell and tube condenser 11 and the outlet water temperature of the shell and tube condenser 11 in step S130 includes: and determining the initial opening of the water regulating valve before the air conditioner in the machine room is started.

The following further describes, with reference to a schematic flow chart of an embodiment of determining the initial opening degree of the water regulating valve before the machine room air conditioner is started in the method of the present invention shown in fig. 4, a specific process of determining the initial opening degree of the water regulating valve before the machine room air conditioner is started, including: step S310 and step S320.

Step S310, before the compressor 6 of the machine room air conditioner is started, after the machine room air conditioner is powered on, the water regulating valve is controlled to execute reset action, namely, the water regulating valve is fully opened and then fully closed.

Step S320, after the machine room air conditioner is powered on for the set power-on time, determining the initial opening of the water regulating valve according to the cooling water inlet water temperature of the shell and tube condenser 11. The cooling water inlet temperature of the shell and tube condenser 11 is the temperature in the pipeline where the cooling water inlet of the shell and tube condenser 11 is located.

Wherein, the initial opening degree of the regulating water valve is determined according to the inlet water temperature of the cooling water of the shell and tube condenser 11, and the determination conditions comprise the following two determination conditions:

the first determination case: and under the condition that the inlet water temperature of the cooling water of the shell and tube condenser 11 is lower than the set inlet water temperature or the fault of a sensor of the inlet water temperature of the cooling water of the shell and tube condenser 11 occurs, determining the initial opening degree of the water regulating valve to be a first opening degree.

Second determination case: and under the condition that the inlet water temperature of the cooling water of the shell and tube condenser 11 is greater than or equal to the set inlet water temperature and the sensor of the inlet water temperature of the cooling water of the shell and tube condenser 11 is not in fault, determining that the initial opening of the water regulating valve is the second opening. The second opening degree is larger than the first opening degree.

In some embodiments, the controlling the water regulating valve according to the condensing pressure value of the shell-and-tube condenser 11 and the outlet water temperature of the shell-and-tube condenser 11 in step S130 further includes: the process of adjusting the water valve is controlled after the compressor is started.

The following further describes, with reference to a schematic flow chart of an embodiment of controlling the water regulating valve after the compressor is started in the method of the present invention shown in fig. 5, a specific process of controlling the water regulating valve after the compressor is started, including: step S410 to step S440.

And step S410, under the condition that a compressor 6 of the machine room air conditioner has a starting requirement, controlling a cooling water pump of the machine room air conditioner to be started, controlling the adjusting water valve to be fully opened, and controlling the opening degree of the adjusting water valve to be a predetermined initial opening degree after the starting time length is set.

Step S420, determining whether the condensation pressure value is less than a set condensation pressure value.

And step S430, if the condensation pressure value is smaller than a set condensation pressure value, controlling the opening degree of the water regulating valve to maintain the initial opening degree within a set operation time for turning on the compressor 6. And then, controlling the water regulating valve according to the condensation pressure value and the water outlet temperature.

Step S440, if the condensation pressure value is greater than or equal to a set condensation pressure value, or after the compressor 6 is started for the set operation time, controlling the water regulating valve according to the condensation pressure value and the outlet water temperature.

In some embodiments, the step S430 and the step S440 of controlling the water regulating valve according to the condensation pressure value and the outlet water temperature includes any one of the following control conditions:

the first control case: and if the condensation pressure value is smaller than a first set pressure value, controlling the regulating water valve to be closed according to a first set regulating period under the condition that the sensor of the outlet water temperature fails. And under the condition that the sensor of the outlet water temperature is not in fault, if the outlet water temperature is less than the set outlet water temperature, the regulating water valve is controlled to be closed according to a first set regulating period, and if the outlet water temperature is greater than or equal to the set outlet water temperature, the regulating water valve is controlled to be opened according to the first set regulating period. The first set pressure value is 1900 KPa.

The second control case: and if the condensation pressure value is greater than or equal to a first set pressure value and less than a second set pressure value, controlling the opening of the water regulating valve to be unchanged under the condition of the fault of the sensor of the outlet water temperature. And under the condition that the sensor of the outlet water temperature is not in fault, if the outlet water temperature is lower than the set outlet water temperature, controlling the opening of the regulating water valve to be unchanged, and if the outlet water temperature is higher than or equal to the set outlet water temperature, controlling the opening of the regulating water valve to be larger according to a first set regulating period. The second set pressure value is 2300 KPa.

The third control case: and if the condensation pressure value is greater than or equal to a second set pressure value and less than a third set pressure value, controlling the opening of the regulating water valve according to a first set regulating period under the condition that the sensor of the outlet water temperature fails. And under the condition that the sensor of the outlet water temperature has no fault, if the outlet water temperature is less than the set outlet water temperature, controlling the opening of the regulating water valve according to a first set regulating period, and if the outlet water temperature is more than or equal to the set outlet water temperature, controlling the opening of the regulating water valve according to the first set regulating period and increasing the opening by a large margin. The third set pressure value is 2600 KPa.

Fourth control case: and if the condensation pressure value is greater than or equal to a third set pressure value and less than a fourth set pressure value, controlling the opening of the regulating water valve to be large according to a second set period. The fourth set pressure value is 2600 KPa.

Fifth control case: and if the condensation pressure value is greater than or equal to a fourth set pressure value and less than a fifth set pressure value, controlling the opening of the water regulating valve according to a third set period, and controlling the frequency rising amplitude of the compressor 6 to be not greater than the set amplitude. A fifth set pressure value, such as 3300 KPa.

Sixth control case: and if the condensation pressure value is greater than or equal to a fifth set pressure value and less than a sixth set pressure value, controlling the water regulating valve to be closed according to a third set period, and controlling the frequency reduction of the compressor 6. The sixth set pressure value is, for example, 3500 KPa.

The seventh control case: and if the condensation pressure value is greater than or equal to a fifth set pressure value and less than a sixth set pressure value, controlling the regulating water valve to be fully opened, and controlling the frequency rising amplitude of the compressor 6 to be not greater than the set amplitude.

Since the processing and functions implemented by the method of this embodiment basically correspond to the embodiments, principles and examples of the air conditioner in the machine room, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment.

By adopting the technical scheme of the embodiment, the two independent compressor fluorine systems share the shell and tube condenser, the condensing pressure of the two independent compressor fluorine systems is collected, the opening of the throttle valve is controlled according to the range of the condensing pressure and the water outlet temperature of the shell and tube condenser, so that the shell and tube condenser shared by the two independent compressor fluorine systems stably operates, the energy efficiency ratio of a unit is favorably improved, and the design cost is reduced.

In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.

The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The control device of the air conditioner of the computer lab is characterized in that, the air conditioner of the computer lab adopts a double fluorine system to share a built-in shell and tube condenser (11); the bifluoride system comprising: a first compressor fluorine system and a second compressor fluorine system; the first compressor fluorine system and the second compressor fluorine system are mutually independently arranged and share the shell and tube condenser (11); the shell and tube condenser (11) is provided with a cooling water outlet pipeline, and a water regulating valve is arranged on the cooling water outlet pipeline of the shell and tube condenser (11); the control device of the machine room air conditioner comprises:

the acquisition unit is configured to acquire a pressure value of the first compressor fluorine system and record the pressure value as a first high-pressure value; acquiring a pressure value of the fluorine system of the second compressor, and recording the pressure value as a second high-pressure value; and obtaining the outlet water temperature of the shell and tube condenser (11);

a control unit configured to determine a condensing pressure value of the shell and tube condenser (11) from the first and second high pressure values;

the control unit is also configured to control the water regulating valve according to the condensing pressure value of the shell-and-tube condenser (11) and the outlet water temperature of the shell-and-tube condenser (11).

2. The control device of air conditioner in machine room according to claim 1, wherein said first compressor fluorine system comprises: a heat exchanger, a compressor (6) and a throttling element; wherein the content of the first and second substances,

a refrigerant outlet of the heat exchanger is communicated to an air suction port of the compressor (6) through a first pipeline; an exhaust port of the compressor (6) is communicated to a first refrigerant inlet of the shell and tube condenser (11) through a second pipeline; a first refrigerant outlet of the shell and tube condenser (11) is communicated to a refrigerant inlet of the heat exchanger through a third pipeline;

the throttling element is arranged on the third pipeline.

3. The control device of the air conditioner in the machine room according to claim 2, wherein the throttle member includes: a capillary tube (8) and an electronic expansion valve (7); the capillary tube (8) and the electronic expansion valve (7) are arranged in parallel.

4. The control device of air conditioner in machine room according to claim 2, wherein said first compressor fluorine system further comprises: an electric heater (3) and an EC fan (5); wherein the content of the first and second substances,

the electric heater (3) is arranged between the heat exchanger and the EC fan (5).

5. The control device of air conditioner in machine room according to claim 4, wherein said first compressor fluorine system further comprises: an electrode humidifier (4); the electrode humidifier (4) is arranged between the electric heater (3) and the EC fan (5).

6. The control device of air conditioner in machine room according to any one of claims 2 to 4, wherein the second compressor fluorine system has the same structure as the first compressor fluorine system.

7. The control device of air conditioners of any one of claims 2 to 5, wherein,

the first high-pressure value is a pressure value in a pipeline communicated with a first refrigerant outlet of the shell and tube condenser (11);

the second high-pressure value is a pressure value in a pipeline communicated with a second refrigerant outlet of the shell and tube condenser (11);

and the outlet water temperature of the shell and tube condenser (11) is the temperature in a pipeline communicated with a cooling water outlet of the shell and tube condenser (11).

8. The control device of air conditioner in machine room according to any one of claims 1 to 5, wherein the control unit determines the condensing pressure value of the shell-and-tube condenser (11) according to the first and second high pressure values, comprising:

determining whether the first high pressure value is less than the second high pressure value;

if the first high-pressure value is smaller than the second high-pressure value, determining that the first high-pressure value is the condensation pressure value of the shell-and-tube condenser (11) under the condition that the second high-pressure value is smaller than a set high-pressure value; determining the second high-pressure value as the condensation pressure value of the shell-tube condenser (11) under the condition that the second high-pressure value is greater than or equal to the set high-pressure value;

if the first high-pressure value is greater than or equal to the second high-pressure value, determining that the second high-pressure value is the condensation pressure value of the shell-tube condenser (11) under the condition that the first high-pressure value is less than a set high-pressure value; and under the condition that the first high-pressure value is greater than or equal to a set high-pressure value, determining the first high-pressure value as the condensation pressure value of the shell and tube condenser (11).

9. The control device of air conditioners in machine rooms according to any one of claims 1 to 5, wherein the control unit controls the water regulating valve according to the condensing pressure value of the shell-and-tube condenser (11) and the outlet water temperature of the shell-and-tube condenser (11), and comprises:

after the machine room air conditioner is powered on, controlling the water regulating valve to execute a reset action;

after the machine room air conditioner is powered on and the power-on time length is set, determining the initial opening degree of the water regulating valve according to the cooling water inlet temperature of the shell and tube condenser (11);

wherein the control unit determines the initial opening degree of the water regulating valve according to the cooling water inlet temperature of the shell and tube condenser (11), and comprises:

determining the initial opening degree of the water regulating valve to be a first opening degree under the condition that the inlet water temperature of the cooling water of the shell-and-tube condenser (11) is lower than the set inlet water temperature or the fault of a sensor of the inlet water temperature of the cooling water of the shell-and-tube condenser (11);

determining the initial opening of the water regulating valve to be a second opening under the conditions that the inlet water temperature of the cooling water of the shell and tube condenser (11) is greater than or equal to the set inlet water temperature and a sensor of the inlet water temperature of the cooling water of the shell and tube condenser (11) does not break down; the second opening degree is larger than the first opening degree.

10. The control device of air conditioners in machine rooms according to claim 9, wherein the control unit controls the water regulating valve according to the condensing pressure value of the shell-and-tube condenser (11) and the outlet water temperature of the shell-and-tube condenser (11), further comprising:

under the condition that a compressor (6) of the machine room air conditioner has a starting requirement, controlling a cooling water pump of the machine room air conditioner to be started, controlling the adjusting water valve to be fully opened, and controlling the opening degree of the adjusting water valve to be a predetermined initial opening degree after the starting time length is set;

determining whether the condensation pressure value is less than a set condensation pressure value;

if the condensation pressure value is smaller than a set condensation pressure value, controlling the opening degree of the water regulating valve to keep the initial opening degree within the set running time of the opening of the compressor (6); then, controlling the water regulating valve according to the condensation pressure value and the water outlet temperature;

and if the condensation pressure value is greater than or equal to a set condensation pressure value or the compressor (6) is started for the set running time, controlling the water regulating valve according to the condensation pressure value and the water outlet temperature.

11. The control device of the air conditioner in the machine room according to claim 10, wherein the control unit controls the water regulating valve according to the condensing pressure value and the outlet water temperature, and comprises:

if the condensation pressure value is smaller than a first set pressure value, controlling the regulating water valve to be closed according to a first set regulating period under the condition that the sensor of the outlet water temperature fails; under the condition that the sensor of the outlet water temperature is not in fault, if the outlet water temperature is lower than the set outlet water temperature, the regulating water valve is controlled to be closed according to a first set regulating period, and if the outlet water temperature is higher than or equal to the set outlet water temperature, the regulating water valve is controlled to be opened according to the first set regulating period;

if the condensation pressure value is greater than or equal to a first set pressure value and less than a second set pressure value, controlling the opening of the water regulating valve to be unchanged under the condition that the sensor of the outlet water temperature fails; under the condition that the sensor of the outlet water temperature is not in fault, if the outlet water temperature is lower than the set outlet water temperature, the opening of the regulating water valve is controlled to be unchanged, and if the outlet water temperature is higher than or equal to the set outlet water temperature, the opening of the regulating water valve is controlled to be larger according to a first set regulating period;

if the condensation pressure value is greater than or equal to a second set pressure value and less than a third set pressure value, controlling the opening of the regulating water valve according to a first set regulation period under the condition that the sensor of the outlet water temperature fails; under the condition that the sensor of the outlet water temperature is not in fault, if the outlet water temperature is lower than the set outlet water temperature, the opening of the regulating water valve is controlled to be large according to a first set regulating period, and if the outlet water temperature is higher than or equal to the set outlet water temperature, the opening of the regulating water valve is controlled to be large according to the first set regulating period and the opening is greatly increased;

if the condensation pressure value is greater than or equal to a third set pressure value and less than a fourth set pressure value, controlling the opening of the regulating water valve to be large according to a second set period;

if the condensation pressure value is greater than or equal to a fourth set pressure value and less than a fifth set pressure value, controlling the opening of the water regulating valve to be large according to a third set period, and controlling the frequency rising amplitude of the compressor (6) to be not greater than the set amplitude;

if the condensation pressure value is greater than or equal to a fifth set pressure value and less than a sixth set pressure value, controlling the regulating water valve to be closed according to a third set period, and controlling the frequency reduction of the compressor (6);

and if the condensation pressure value is greater than or equal to a fifth set pressure value and less than a sixth set pressure value, controlling the adjusting water valve to be fully opened, and controlling the frequency rising amplitude of the compressor (6) to be not greater than the set amplitude.

12. A machine room air conditioner, comprising: the control device of the air conditioner of the machine room according to any one of claims 1 to 11.