Two-section type energy-saving cooling system

Abstract

The utility model provides a two-section type energy-saving cooling system which comprises a plurality of sets of energy-saving cooling devices. A cooler on one side of the energy-saving cooling equipment is communicated to a first cold source, and the first cold source is supplied by circulating water of a cooling tower; a cooler on the other side of the energy-saving cooling equipment is communicated to a second cold source, and the second cold source adopts cold machine centralized supply; hot air of the frequency converter is cooled in two sections, cooling tower circulating water is used as a first cold source, and on-off of the cooling tower circulating water entering the first-section cooler is controlled through the two-way switch valve according to the hot air temperature point of the frequency converter. The cooler of the second cold source uses liquid as a secondary refrigerant, and the flow of the liquid secondary refrigerant entering the second-section cooler is adjusted through the two-way simulation adjusting valve according to the hot air cooling point of the frequency converter. According to the utility model, the defects of frequent start and stop of the system and large fluctuation of a cooling point are avoided. And the defects of many fault points and high maintenance cost are avoided. And the possibility that cooling tower circulating water is changed into a heat source from a cold source is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of power equipment cooling, in particular to a two-stage energy-saving cooling system. Background Art

[0002] During the operation of electrical equipment, especially the heat generation of high-voltage inverters is relatively high, and a set of energy-saving and safe cooling system needs to be matched to meet the operating environment of the high-voltage inverter. In the over-temperature state, it will cause the high-voltage inverter to alarm or shut down, and affect the service life. Therefore, a cooling system is needed to cool the high-voltage inverter to reduce the failure rate of the inverter and extend the service life of the inverter.

[0003] In the prior art, there are three defects: 1. The cold source of the second cooler of the energy-saving cooling equipment in the conventional two-stage energy-saving cooling system is a direct expansion refrigeration system. Since the load of the second cooler will change with the change of the heat generation of the high-voltage inverter, the cold source must be adjusted. Due to the high upfront investment cost of the variable frequency direct expansion refrigeration system, the current conventional adjustment method is to set multiple industrial frequency direct expansion refrigeration systems and adjust the cooling capacity by changing the number of systems started. Its disadvantage is that the temperature fluctuation is large. Once the load is less than the cooling capacity of an industrial frequency direct expansion refrigeration system, it will cause the system to start and stop frequently, shortening the service life of the compressor. 2. The cold source of the second cooler of the energy-saving cooling equipment in the conventional two-stage energy-saving cooling system is one-to-one cooling. One-to-one cooling means that a set of industrial frequency direct expansion refrigeration systems supplies cooling to a second cooler. Its disadvantages are complex manufacturing process, many failure points, and high maintenance cost. 3. The cold source of the first cooler of the energy-saving cooling equipment in the conventional two-stage energy-saving cooling system is cooling tower circulating water, and there is no control when the cooling tower circulating water enters the first cooler. Its disadvantage is that when the hot air temperature of the inverter is lower than the temperature of the cooling tower circulating water, the cooling tower circulating water not only cannot play a cooling role, but will instead become a heating source for the hot air of the inverter. The above three defects are all problems that need to be solved and research directions for those skilled in the art. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a two-stage energy-saving cooling system, which can solve the following three problems: 1. The problem that the temperature fluctuation is large. Once the load is less than the cooling capacity of an industrial frequency direct expansion refrigeration system, it will cause the system to start and stop frequently, shortening the service life of the compressor. 2. The problems of complex manufacturing process, many failure points, and high maintenance cost. 3. The problem that when the hot air temperature of the inverter is lower than the temperature of the cooling tower circulating water, the cooling tower circulating water not only cannot play a cooling role, but will instead become a heating source for the hot air of the inverter.

[0005] To achieve the above object, the utility model is realized by the following technical solutions: a two-stage energy-saving cooling system, including energy-saving cooling equipment, and the energy-saving cooling equipment is arranged in multiple groups;

[0006] One side of the energy-saving cooling equipment is fixedly communicated with a first cold source, the first cold source is supplied by circulating water of a cooling tower, and a two-way switch valve is arranged on the supply pipeline between the cooler on one side of the energy-saving cooling equipment and the first cold source, and the on-off of the two-way switch valve is controlled by the hot air temperature point of the frequency converter;

[0007] The other side of the energy-saving cooling equipment is fixedly communicated with a second cold source, the second cold source is supplied in a centralized manner, the refrigerant carried by the cold machine of the second cold source is a liquid, and a two-way analog regulating valve is arranged on the supply pipeline between the cooler on the other side of the energy-saving cooling equipment and the second cold source, and the analog opening of the two-way analog regulating valve controls the hot air cooling point of the frequency converter.

[0008] Further, the energy-saving cooling equipment includes a first-stage cooler and a second-stage cooler, the first-stage cooler and the second-stage cooler are arranged left and right, the first-stage cooler is fixedly communicated with the first cold source, and the second-stage cooler is fixedly communicated with the second cold source.

[0009] Further, the first cold source includes a cooling tower, a cooling water circulation pump and a cooling water two-way switch valve, one end of the first-stage cooler is fixedly communicated with the cooling water two-way switch valve, the end of the cooling water two-way switch valve far from the first-stage cooler is fixedly communicated with one end of the cooling water circulation pump, the end of the cooling water circulation pump far from the cooling water two-way switch valve is fixedly communicated with one end of the cooling tower, and the other end of the cooling tower is fixedly communicated with the first-stage cooler.

[0010] Further, the second cold source includes an air-cooled / water-cooled chiller, a chilled water circulation pump, an expansion tank and a chilled water analog two-way regulating valve, one end of the second-stage cooler is fixedly communicated with one end of the chilled water analog two-way regulating valve, the end of the chilled water analog two-way regulating valve far from the second-stage cooler is fixedly communicated with one end of the chilled water circulation pump, the end of the chilled water circulation pump far from the chilled water analog two-way regulating valve is fixedly communicated with one end of the air-cooled / water-cooled chiller, and the other end of the air-cooled / water-cooled chiller is fixedly communicated with the second-stage cooler. Wherein a branch is led out from the end of the chilled water circulation pump far from the air-cooled / water-cooled chiller and fixedly communicated with the expansion tank.

[0011] The beneficial effects of the utility model:

[0012] 1. The utility model divides the hot air of the frequency converter into two sections for cooling. The chiller of the second cold source in the two-stage energy-saving cooling system uses liquid as the coolant, such as fresh water, brine, and ethylene glycol. When the liquid enters the second cooler, the flow rate of the liquid entering the second cooler needs to be adjusted by a two-way analog regulating valve to achieve a more accurate hot air cooling point of the frequency converter. Or, without using the two-way regulating valve, the hot air cooling point of the frequency converter can be achieved by controlling the temperature point of the coolant, avoiding the defect of large fluctuations in the cooling point and frequent start-stop of the system when the heat generation of the high-voltage frequency converter is small.

[0013] 2. The second cold source in the two-stage energy-saving cooling system of the utility model adopts centralized supply, and a set of cold source equipment supplies cooling for multiple energy-saving cooling equipment. Compared with the conventional one-to-one supply power-frequency direct expansion refrigeration system, a set of cold source has the advantages of simple manufacturing process, few fault points, and low maintenance and management costs.

[0014] 3. The first cold source in the two-stage energy-saving cooling system of the utility model is the circulating water of the cooling tower. When the circulating water of the cooling tower enters the first cooler, the opening and closing of the circulating water entering the first cooler need to be controlled by a two-way switch valve. When the hot air temperature of the frequency converter is greater than the temperature of the circulating water of the cooling tower, the two-way switch valve is opened. When the hot air temperature of the frequency converter is less than or equal to the temperature of the circulating water of the cooling tower, the two-way switch valve is closed, avoiding the possibility that the cold source becomes a heat source under specific conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, other features, objects, and advantages of the present utility model will become more apparent:

[0016] Figure 1 It is the two-stage energy-saving cooling system of the high-voltage frequency converter in the embodiment of the present utility model;

[0017] Figure 2 It is the energy-saving cooling equipment of the high-voltage frequency converter in the embodiment of the present utility model.

[0018] In the figure: 1. Energy-saving cooling equipment; 1.1. First cooler; 1.2. Second cooler; 2. Air-cooled / water-cooled chiller; 3. Chilled water circulation pump; 4. Expansion tank; 5. Chilled water analog two-way regulating valve; 6. Cooling water two-way switch valve; 7. Cooling tower; 8. Cooling water circulation pump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] To make the technical means, creative features, achieved purposes, and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with the specific embodiments.

[0020] Please refer to Figure 1 , Figure 1This is the two-stage energy-saving cooling system for high-voltage inverters in the embodiments of the present utility model.

[0021] The two-stage energy-saving cooling system includes energy-saving cooling devices 1, and multiple groups of energy-saving cooling devices 1 are provided;

[0022] One side of the energy-saving cooling device 1 is fixedly communicated with the first cold source. The first cold source is supplied by the circulating water of the cooling tower. A two-way switch valve is arranged on the supply pipeline between the cooler on one side of the energy-saving cooling device 1 and the first cold source, and the on-off and opening / closing of the two-way switch valve are controlled by the hot air temperature point of the inverter;

[0023] The other side of the energy-saving cooling device 1 is fixedly communicated with the second cold source. The second cold source is supplied in a centralized manner. The cold carrier of the second cold source is a liquid. A two-way analog regulating valve is arranged on the supply pipeline between the cooler on the other side of the energy-saving cooling device 1 and the second cold source, and the analog opening of the two-way analog regulating valve controls the hot air cooling point of the inverter.

[0024] Please refer to Figure 2 , Figure 2 This is the energy-saving cooling device 1 for high-voltage inverters in the embodiments of the present utility model.

[0025] The energy-saving cooling device 1 includes a first-stage cooler 1.1 and a second-stage cooler 1.2. The first-stage cooler 1.1 and the second-stage cooler 1.2 are arranged left and right. The first-stage cooler 1.1 is fixedly communicated with the first cold source, and the second-stage cooler 1.2 is fixedly communicated with the second cold source.

[0026] The first cold source includes a cooling tower 7, a cooling water circulation pump 8, and a cooling water two-way switch valve 6. One end of the first-stage cooler 1.1 is fixedly communicated with the cooling water two-way switch valve 6. The end of the cooling water two-way switch valve 6 far from the first-stage cooler 1.1 is fixedly communicated with one end of the cooling water circulation pump 8. The end of the cooling water circulation pump 8 far from the cooling water two-way switch valve 6 is fixedly communicated with one end of the cooling tower 7. The other end of the cooling tower 7 is fixedly communicated with the first-stage cooler 1.1.

[0027] The second cold source includes an air-cooled / water-cooled chiller 2, a chilled water circulation pump 3, an expansion tank 4, and a chilled water analog two-way regulating valve 5. One end of the second-stage cooler 1.2 is fixedly communicated with one end of the chilled water analog two-way regulating valve 5. The end of the chilled water analog two-way regulating valve 5 far from the second-stage cooler 1.2 is fixedly communicated with one end of the chilled water circulation pump 3. The end of the chilled water circulation pump 3 far from the chilled water analog two-way regulating valve 5 is fixedly communicated with one end of the air-cooled / water-cooled chiller 2. The other end of the air-cooled / water-cooled chiller 2 is fixedly communicated with the second-stage cooler 1.2. Wherein, a branch is led out from the end of the chilled water circulation pump 3 far from the air-cooled / water-cooled chiller 2 and fixedly communicated with the expansion tank 4.

[0028] Working principle: The hot air of the frequency converter is cooled in two stages. The chiller of the second cold source in the energy-saving cooling device 1 uses a liquid as the coolant, such as fresh water, brine, and ethylene glycol. When the liquid enters the second-stage cooler 1.2, the flow rate of the liquid entering the second-stage cooler 1.2 needs to be adjusted through a two-way analog regulating valve to achieve a more accurate hot air cooling point of the frequency converter. Or, without using the two-way regulating valve, the hot air cooling point of the frequency converter can be achieved by controlling the temperature point of the coolant of the air-cooled / water-cooled chiller 2. The second cold source in the energy-saving cooling device 1 adopts centralized supply, and one set of cold source equipment supplies cooling for multiple energy-saving cooling devices 1. The coolant of the chiller of the first cold source in the energy-saving cooling device 1 is the circulating water of the cooling tower 7. When the circulating water of the cooling tower 7 enters the first-stage cooler 1.1, the opening and closing of the circulating water entering the first-stage cooler 1.1 need to be controlled through a two-way on-off valve. When the hot air temperature of the frequency converter is higher than the circulating water temperature of the cooling tower 7, the two-way on-off valve is opened. When the hot air temperature of the frequency converter is less than or equal to the circulating water temperature of the cooling tower 7, the two-way on-off valve is closed.

[0029] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0030] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Two-stage energy-saving cooling system, characterized in that: Including an energy-saving cooling device (1), and multiple groups of the energy-saving cooling devices (1) are provided; One side cooler of the energy-saving cooling device (1) is connected to a first cold source, and the first cold source is supplied with cooling tower circulating water. A two-way switch valve is provided on the supply pipeline between the one side cooler of the energy-saving cooling device (1) and the first cold source, and the on-off of the two-way switch valve is controlled by the hot air temperature point of the frequency converter; The other side cooler of the energy-saving cooling device (1) is connected to a second cold source, and the second cold source is supplied in a centralized manner. The refrigerant carried by the cooler of the second cold source is a liquid. A two-way analog regulating valve is provided on the supply pipeline between the other side cooler of the energy-saving cooling device (1) and the second cold source, and the analog opening of the two-way analog regulating valve controls the hot air cooling point of the frequency converter.

2. The two-stage energy-saving cooling system according to claim 1, wherein: The energy-saving cooling device (1) includes a first-stage cooler (1.1) and a second-stage cooler (1.2), the first-stage cooler (1.1) and the second-stage cooler (1.2) are arranged left and right, the first-stage cooler (1.1) is fixedly connected to the first cold source, and the second-stage cooler (1.2) is fixedly connected to the second cold source.

3. The two-stage energy-saving cooling system according to claim 2, characterized in that: The first cold source includes a cooling tower (7), a cooling water circulation pump (8) and a cooling water two-way switch valve (6). One end of the first-stage cooler (1.1) is fixedly connected to the cooling water two-way switch valve (6), the end of the cooling water two-way switch valve (6) far from the first-stage cooler (1.1) is fixedly connected to one end of the cooling water circulation pump (8), the end of the cooling water circulation pump (8) far from the cooling water two-way switch valve (6) is fixedly connected to one end of the cooling tower (7), and the other end of the cooling tower (7) is fixedly connected to the first-stage cooler (1.1).

4. The two-stage energy-saving cooling system according to claim 2, wherein: The second cold source includes an air-cooled / water-cooled chiller (2), a chilled water circulation pump (3), an expansion tank (4) and a chilled water analog two-way regulating valve (5). One end of the second-stage cooler (1.2) is fixedly connected to one end of the chilled water analog two-way regulating valve (5), the end of the chilled water analog two-way regulating valve (5) far from the second-stage cooler (1.2) is fixedly connected to one end of the chilled water circulation pump (3), the end of the chilled water circulation pump (3) far from the chilled water analog two-way regulating valve (5) is fixedly connected to one end of the air-cooled / water-cooled chiller (2), and the other end of the air-cooled / water-cooled chiller (2) is fixedly connected to the second-stage cooler (1.2). Wherein, a branch is led out from the end of the chilled water circulation pump (3) far from the air-cooled / water-cooled chiller (2) and fixedly connected to the expansion tank (4).

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