Energy-saving system applied to central air conditioner

Abstract

The utility model discloses an energy-saving system applied to a central air conditioner. The energy-saving system comprises an air conditioner circulating water system and a pressure difference adjusting system. The air-conditioning circulating water system comprises a central air-conditioning unit, a filter, a water pump, a first electric valve and a second electric valve; a water inlet of the air-conditioning circulating water system is connected with a water outlet of the second electric valve; a water outlet of the air-conditioning circulating water system is sequentially connected with water inlets of the first electric valve, the filter, the water pump and the second electric valve; the pressure difference adjusting system comprises a controller and a pressure sensor group; the output end of the pressure sensor group is in communication connection with the input end of the controller; the output end of the controller is in communication connection with the input ends of the filter, the water pump, the first electric valve and the second electric valve. According to the utility model, the pressure difference of non-energy-consuming equipment such as the filter can be obviously reduced, and unnecessary power consumption is effectively avoided, so that the operation cost of the central air conditioner is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning energy saving, and in particular to an energy-saving system applied to a central air-conditioning system. Background Art

[0002] With the widespread adoption of central air conditioning in major venues and homes, the issue of high power consumption has become increasingly prominent. Currently, most central air conditioners on the market fail to adjust pump and fan speeds based on actual load changes during operation. This causes the central air conditioner's circulating water system to run at full speed for extended periods. Even when not at full load, this high energy consumption not only increases operating costs but also wastes electricity resources.

[0003] Existing energy-saving devices for central air conditioning circulating water systems often focus solely on parameters such as the circulating water pump's inlet and outlet pressures and valve opening, overlooking non-energy-consuming equipment in the system, such as filters. While these devices don't directly consume energy, their performance significantly impacts the system's overall operating efficiency. Specifically, when the electric valve is operating normally and fully open, the valve resistance is minimal. However, after a period of use, the filter's resistance gradually increases due to the accumulation of impurities, increasing flow resistance within the system and impacting overall system efficiency. In some central air conditioning circulating water systems, the pressure differential across the filters can even reach over 0.06 MPa, significantly increasing the system's energy consumption and operating costs.

[0004] In view of this, those skilled in the art are in urgent need of an energy-saving system applied to central air conditioning to improve the energy-saving effect and operating efficiency of the central air conditioning water circulation system. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides an optimization energy-saving system for central air conditioning, which is used to solve the problem that the existing air conditioning energy-saving equipment cannot optimize and save energy for non-energy-consuming equipment in the central air conditioning water circulation system.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] An energy-saving system for central air conditioning, comprising an air conditioning circulating water system and a pressure difference regulating system;

[0008] The air conditioning circulating water system includes a central air conditioning unit, a filter, a water pump, a first electric valve, and a second electric valve; the water inlet of the air conditioning circulating water system is connected to the water outlet of the second electric valve, and the water outlet of the air conditioning circulating water system is connected to the water inlet of the first electric valve, the filter, the water pump, and the second electric valve in sequence;

[0009] The pressure difference regulation system includes a controller and a pressure sensor group; the output end of the pressure sensor group is communicatively connected to the input end of the controller; the output end of the controller is communicatively connected to the input ends of the filter, water pump, first electric valve, and second electric valve respectively.

[0010] According to an embodiment of the present utility model, the pressure sensor group includes a first pressure sensor, a second pressure sensor, a third pressure sensor, and a fourth pressure sensor;

[0011] The first pressure sensor is arranged at the water outlet of the first electric valve, the second pressure sensor is arranged at the water outlet of the filter; the third pressure sensor is arranged at the water inlet of the water pump; the fourth pressure sensor is arranged at the water outlet of the second electric valve;

[0012] The output ends of the first pressure sensor, the second pressure sensor, the third pressure sensor and the fourth pressure sensor are all communicatively connected to the input end of the controller.

[0013] According to an embodiment of the present utility model, the air conditioning circulating water system further includes a check valve;

[0014] The water inlet of the check valve is connected to the water outlet of the water pump, and the water outlet of the check valve is connected to the water inlet of the second electric valve; the output end of the controller is communicatively connected to the input end of the check valve to control the start and stop of the check valve according to the pressure value detected by the pressure sensing group.

[0015] According to an embodiment of the present utility model, the central air-conditioning unit includes an air-conditioning main unit, a water distributor, a terminal device, and a water collector;

[0016] The water outlet of the second electric valve is connected to the water inlet of the air-conditioning host, and the water outlet of the air-conditioning host is connected to the water inlet of the water distributor; the water outlet of the water distributor is connected to the water inlet of the terminal device, and the water outlet of the terminal device is connected to the water inlet of the water collector; the water outlet of the water collector is connected to the water inlet of the first electric valve.

[0017] According to an embodiment of the present invention, the pressure difference regulation system further includes a host computer, and an input end of the host computer is communicatively connected to an output end of the controller.

[0018] According to an embodiment of the present invention, the controller is a PLC controller or a single chip microcomputer.

[0019] According to an embodiment of the present invention, the filter is an automatic backwash filter.

[0020] According to an embodiment of the present invention, the check valve is a slow-opening and slow-closing check valve or a pipe force valve.

[0021] Through the embodiments of the present utility model, an energy-saving system applied to central air conditioning is realized, which can use a pressure sensor group to monitor the pressure difference at different positions of the pressure difference regulation system in real time, and regulate one or more of the filter, water pump, first electric valve and second electric valve through a controller, which can significantly reduce the pressure difference of non-energy-consuming equipment such as the filter, effectively avoid unnecessary power consumption, thereby reducing the operating cost of the central air conditioning, and effectively improving the efficiency and stability of the central air conditioning operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic structural diagram of an energy-saving optimization system according to an embodiment of this specification is shown;

[0024] Figure 2 A schematic diagram showing the principle of a pressure difference regulation system provided in accordance with an embodiment of this specification is shown;

[0025] Among them, 1 is the air conditioner main unit; 2 is the water distributor; 3 is the terminal device; 4 is the water collector; 5 is the first electric valve; 6 is the filter; 7 is the water pump; 8 is the check valve; 9 is the second electric valve; 10 is the first pressure sensor; 11 is the second pressure sensor; 12 is the third pressure sensor; 13 is the fourth pressure sensor. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more apparent, the following will describe in detail exemplary embodiments of the present invention with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described herein.

[0027] In this specification and the accompanying drawings, substantially the same or similar steps and elements are denoted by the same or similar reference numerals, and repeated descriptions of these steps and elements will be omitted. Furthermore, in the description of the present invention, the terms "first," "second," etc. are used only to distinguish descriptions and are not to be understood as indicating or implying relative importance or ranking.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the field of the present invention. The terms used herein are only for the purpose of describing the embodiments of the present invention and are not intended to limit the present invention.

[0029] Figure 1 A schematic structural diagram of an energy-saving optimization system according to an embodiment of this specification is shown;

[0030] like Figure 1 As shown, the embodiment of the present utility model provides an energy-saving system for central air conditioning, including an air conditioning circulating water system and a pressure difference regulating system;

[0031] In some embodiments, the air conditioning circulating water system includes a central air conditioning unit, a filter 6, a water pump 7, a check valve 8, a first electric valve 5 and a second electric valve 9; the pressure difference regulation system includes a controller and a pressure sensor group;

[0032] Exemplarily, the water inlet of the air-conditioning circulating water system is connected to the water outlet of the second electric valve 9, and the water outlet of the air-conditioning circulating water system is connected to the water inlet of the first electric valve 5; the water outlet of the first electric valve 5 is connected to the water inlet of the filter 6, and the water outlet of the filter 6 is connected to the water inlet of the water pump 7; the water outlet of the water pump 7 is connected to the water inlet of the check valve 8, and the water outlet of the check valve 8 is connected to the water inlet of the second electric valve 9.

[0033] In some embodiments, the pressure sensor group includes a first pressure sensor 10 , a second pressure sensor 11 , a third pressure sensor 12 , and a fourth pressure sensor 13 ;

[0034] Exemplarily, the first pressure sensor 10 is arranged at the water outlet of the first electric valve 5, the second pressure sensor 11 is arranged at the water outlet of the filter 6; the third pressure sensor 12 is arranged at the water inlet of the water pump 7; and the fourth pressure sensor 13 is arranged at the water outlet of the second electric valve 9.

[0035] Figure 2 A schematic diagram showing the principle of a pressure difference regulation system provided in accordance with an embodiment of this specification is shown;

[0036] like Figure 2 As shown, in this embodiment, the output ends of the first pressure sensor 10, the second pressure sensor 11, the third pressure sensor 12, and the fourth pressure sensor 13 are respectively communicatively connected to the input end of the controller; the input ends of the filter 6, the water pump 7, the check valve 8, the first electric valve 5, and the second electric valve 9 are respectively communicatively connected to the output end of the controller.

[0037] In some embodiments, the central air conditioning unit includes an air conditioning host 1, a water distributor 2, a terminal device 3, and a water collector 4;

[0038] For example, the water outlet of the second electric valve 9 is connected to the water inlet of the air-conditioning host 1, and the water outlet of the air-conditioning host 1 is connected to the water inlet of the water distributor 2; the water outlet of the water distributor 2 is connected to the water inlet of the terminal device 3, and the water outlet of the terminal device 3 is connected to the water inlet of the water collector 4; the water outlet of the water collector 4 is connected to the water inlet of the first electric valve 5.

[0039] Specifically, central air conditioners generally use a closed circulation water system. After the air conditioner main unit 1 is cooled, the low-temperature water output by the air conditioner main unit 1 is sent to the water distributor 2. The water distributor 2 sends the low-temperature water to each terminal device 3 for heat exchange, absorbs the heat in the indoor air, and raises the temperature of the low-temperature water. The heated water is then returned to the water collector 4. The water in the water collector 4 returns to the inlet of the first electric valve 5, passes through the filter 6, water pump 7, check valve 8 in sequence, and is input into the air conditioner main unit 1 through the outlet of the second electric valve 9, forming a closed cycle.

[0040] In some embodiments, the pressure difference regulation system further includes a host computer, and an input terminal of the host computer is communicatively connected to an output terminal of the controller.

[0041] In some embodiments, the controller is a PLC controller or a single chip microcomputer.

[0042] In some embodiments, the filter 6 is an automatic backwash filter 6 .

[0043] In some embodiments, the check valve 8 is a slow-opening and slow-closing check valve 8 or a pipe force valve; wherein, when the diameter of the fluid pipeline in the pressure differential regulation system is greater than DN300, the check valve 8 in the present invention adopts a pipe force valve; when the diameter of the fluid pipeline in the pressure differential regulation system is less than DN300, the check valve 8 in the present invention adopts a slow-opening and slow-closing check valve 8.

[0044] According to the above content, when the pressure difference between the first pressure sensor 10 and the second pressure sensor 11, that is, the pressure difference at both ends of the filter 6 reaches a preset threshold, the controller starts the automatic backwashing program of the filter 6 to clean up the impurities in the filter screen of the filter 6, effectively maintaining the efficient operation of the filter 6, and in actual application, the pressure difference at both ends of the filter 6 can be maintained below 0.015MPa for a long time.

[0045] In this embodiment, the check valve 8 can effectively reduce the pressure difference between the third pressure sensor 12 and the fourth pressure sensor 13, and can effectively maintain the pressure difference in the range of 0.01-0.02 MPa for a long time; when the pressure difference between the third pressure sensor 12 and the fourth pressure sensor 13 exceeds 0.02 MPa, the controller sends a prompt signal to the upper computer, prompting the user to perform maintenance, thereby avoiding increased energy consumption due to equipment failure; when the pressure difference between the third pressure sensor 12 and the fourth pressure sensor 13 exceeds 0.04 MPa, the controller activates the pressure difference over-limit protection function, closes the first electric valve 5 and the second electric valve 9, and checks and repairs the actuator of the check valve 8 until the equipment returns to normal, thereby avoiding system paralysis or safety accidents due to equipment failure;

[0046] It should be noted that the central air conditioner generally has a redundant design for the water pump 7, and there is at least one backup pump. In some embodiments, when the pressure difference between the third pressure sensor 12 and the fourth pressure sensor 13 exceeds 0.04 MPa, the normal operation of the central air conditioner can be maintained by switching to the backup pump.

[0047] The present invention has been tried and implemented in actual projects. From the actual operation situation, before the use of the present invention, the pressure difference of the filter 6 often exceeds 0.06MPa, the pressure difference between the water pump 7 and the second electric valve 9 often exceeds 0.05MPa, and the operating power of the water pump 7 is as high as 38kW; after the use of the present invention, the pressure difference of the filter 6 is stable at below 0.015MPa for a long time, the pressure difference of the energy-saving check valve 8 is maintained between 0.01-0.02MPa, and the operating power of the water pump 7 is reduced to 30kW; by comparison, the present invention achieves electricity saving of 8kWh per hour, and is expected to save 25,600 kWh per year, with obvious energy-saving benefits.

[0048] The exemplary embodiments of the present invention described in detail above are merely illustrative and not restrictive. It should be understood by those skilled in the art that various modifications and combinations may be made to these embodiments or their features without departing from the principles and spirit of the present invention, and such modifications should fall within the scope of the present invention.

Claims

1. An energy-saving system for central air conditioning, comprising an air conditioning circulating water system, characterized in that: It also includes a pressure differential regulation system; The air conditioning circulating water system includes a central air conditioning unit, a filter, a water pump, a first electric valve, and a second electric valve; the water inlet of the air conditioning circulating water system is connected to the water outlet of the second electric valve, and the water outlet of the air conditioning circulating water system is connected to the water inlet of the first electric valve, the filter, the water pump, and the second electric valve in sequence; The pressure difference regulation system includes a controller and a pressure sensor group; the output end of the pressure sensor group is communicatively connected to the input end of the controller; the output end of the controller is communicatively connected to the input ends of the filter, water pump, first electric valve, and second electric valve respectively.

2. The system according to claim 1, wherein: The pressure sensor group includes a first pressure sensor, a second pressure sensor, a third pressure sensor, and a fourth pressure sensor; The first pressure sensor is arranged at the water outlet of the first electric valve, and the second pressure sensor is arranged at the water outlet of the filter; The third pressure sensor is arranged at the water inlet of the water pump; the fourth pressure sensor is arranged at the water outlet of the second electric valve; The output ends of the first pressure sensor, the second pressure sensor, the third pressure sensor and the fourth pressure sensor are all communicatively connected to the input end of the controller.

3. The system according to claim 1, wherein: The air conditioning circulating water system further includes a check valve; The water inlet of the check valve is connected to the water outlet of the water pump, and the water outlet of the check valve is connected to the water inlet of the second electric valve; the output end of the controller is communicatively connected to the input end of the check valve to control the start and stop of the check valve according to the pressure value detected by the pressure sensing group.

4. The system according to claim 1, wherein: The central air-conditioning unit includes an air-conditioning main unit, a water distributor, a terminal device, and a water collector; The water outlet of the second electric valve is connected to the water inlet of the air-conditioning host, and the water outlet of the air-conditioning host is connected to the water inlet of the water distributor; the water outlet of the water distributor is connected to the water inlet of the terminal device, and the water outlet of the terminal device is connected to the water inlet of the water collector; the water outlet of the water collector is connected to the water inlet of the first electric valve.

5. The system according to claim 1, wherein: The pressure difference regulation system further includes a host computer, an input end of the host computer being communicatively connected to an output end of the controller.

6. The system according to any one of claims 1 to 3, characterized in that The controller is a PLC controller or a single chip microcomputer.

7. The system according to claim 1, wherein: The filter is an automatic backwash filter.

8. The system according to claim 3, wherein: The check valve is a slow-opening and slow-closing check valve or a pipe force valve.

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