Energy-saving control equipment for water chilling unit of subway air conditioning system
Through the water pump system controlled by multiple water pumps and memory alloy, the energy consumption waste and wear problems of subway chillers when refrigeration demand changes are solved, and the efficient, stable operation and energy-saving effect of chillers are achieved.
Patent Information
- Application Number
- CN202422083660.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-27
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-08-27
AI Technical Summary
When the refrigeration demand of subway chillers changes dynamically, the energy consumption and wear of the water pumps affect the stability and life of the system.
Multiple water pumps and switch valve designs are adopted, combined with memory alloy control, so that the water pumps can be opened and closed as needed, and the number and timing of water pumps are accurately controlled through gear rack and rack transmission, and the working time of normally open and intermittent water pumps is allocated.
It realizes efficient operation of chiller units, reduces energy waste, extends the life of the water pump, ensures system stability and optimizes energy consumption.
Smart Images
Figure CN223153717U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chillers, in particular to an energy-saving control device for a chiller of a subway air-conditioning system. Background Technique
[0002] The working principle of a subway chiller mainly uses the principle of the change of refrigerant between high pressure and low pressure to achieve air cooling. The chiller consists of a compressor, a condenser, an expansion valve and an evaporator, etc. Among them, the compressor and the condenser constitute the high-pressure side of the refrigeration cycle, and the expansion valve and the evaporator constitute the low-pressure side of the refrigeration cycle. Under the action of the expansion valve, the refrigerant enters the evaporator after instantaneously expanding, cooling and depressurizing, and absorbs the surrounding heat, thereby cooling the air. The high-pressure refrigerant is cooled by the condenser and restored to a liquid form, and then enters the evaporator after adjusting the size of the expansion valve for refrigeration, and so on in a cycle.
[0003] Since when the chiller is working, its refrigeration demand is dynamically changing. In some periods, only a small amount of refrigeration capacity may be required. At this time, if all the water pumps are turned on at the same time, it will cause the circulation volume of the cooling water and the chilled water to be too large, exceeding the actual demand. Especially when the chilled water generated by the chiller is sufficient to meet the current refrigeration demand, if the cooling water pump also runs at full speed, it will waste energy and water resources. The water pump will generate energy consumption during operation, and its energy consumption is proportional to the flow rate. When the water pump runs at a flow rate higher than the actual demand, it will not only increase the energy consumption, but also accelerate the wear of the water pump and shorten its service life. Turning on all the water pumps at the same time may also have an adverse impact on the stable operation of the chiller. For example, an excessive water flow rate may cause an increase in system pressure fluctuations, affecting the refrigeration effect and the equipment life. Content of the Utility Model
[0004] The purpose of the utility model is to provide an energy-saving control device for a chiller of a subway air-conditioning system to solve the problems raised in the above background technique.
[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:
[0006] An energy-saving control device for a chiller of a subway air-conditioning system, comprising:
[0007] A body bracket, on which a plurality of water pumps are arranged, a switching valve is connected to each water pump, and a gear is arranged on the switching valve;
[0008] A slider, which is arranged on one side of the switching valve, and a rack for driving the gear to rotate and opening the switching valve to make the water pump work is arranged on the slider.
[0009] Preferably, the water pumps are divided into two groups, namely, a constantly open water pump and an intermittently open water pump.
[0010] Preferably, the movement of the gear and the rack is used to intermittently start the water pump, and the rack meshes with the gear above the water pump.
[0011] Preferably, a compressor is provided on one side of the body bracket away from the water pump, and a water tank is provided between the compressor and the condenser.
[0012] Preferably, a plurality of partition plates are provided in the water tank, and the chambers separated by the partition plates are connected to a plurality of water pumps.
[0013] Preferably, a blower connected to the condenser is provided above the water tank.
[0014] Preferably, fixing blocks are symmetrically provided on one side of the body bracket close to the water pump, and a set of limiting rods are provided on the opposite surfaces of the fixing blocks.
[0015] Preferably, the limiting rods are fixedly connected to the fixing blocks, there are two limiting rods, and shape memory alloys are sleeved on the outer surfaces of the two limiting rods.
[0016] Preferably, the shape memory alloy is arranged in a spring shape, the limiting rod is slidably connected with the slider, and the shape memory alloy is located between the fixing block and the slider on the side close to the normally open water pump.
[0017] Preferably, the ends of the shape memory alloy are respectively fixedly connected to the fixing block and the slider.
[0018] Compared with the prior art, the utility model has the following beneficial effects:
[0019] By providing a plurality of water pumps and switching valves, the system can flexibly adjust the number of water pumps started according to the actual refrigeration demand and working load of the chiller. When the refrigeration demand is low, the number of water pumps started can be reduced to avoid unnecessary energy waste.
[0020] Through the gear design on the switching valve, the opening and closing of the water pump are more accurate, and fine adjustment can be performed according to the system requirements to ensure that the chiller always operates in the best state. Secondly, the rack is gradually driven by the slider, so as to realize the sequential opening of the switching valve. According to the actual refrigeration demand and load change of the chiller, the opening timing of each water pump can be accurately controlled to ensure that the system always operates in the best state.
[0021] After the shape memory alloy is heated and deformed, the working time and tasks of the constant water pump and the intermittently started water pump can be reasonably allocated to optimize the energy consumption of the system. When the system is under high load, the constant water pump provides a stable water flow; when the system is under low load, the intermittently started water pump reduces energy consumption, thus achieving the purpose of energy conservation. The design of the intermittently started water pump can avoid energy waste caused by the continuous operation of the water pump when the system does not require a large amount of cooling water. This on-demand start-up method helps to reduce unnecessary energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0023] Figure 1 is a schematic diagram of the overall structure of the present invention;
[0024] Figure 2 for the present invention Figure 1 is an enlarged schematic diagram of part A in the present invention;
[0025] Figure 3 is a schematic diagram of the structure of the present invention after removing the water pump;
[0026] Figure 4 is a schematic diagram of the overall sectional structure of the present invention.
[0027] Description of drawing numbers: 1, body bracket; 101, compressor; 102, condenser; 103, fan; 2, water pump; 201, water tank; 202, partition board; 203, switch valve; 3, fixing block; 301, limiting rod; 302, shape memory alloy; 303, slider; 304, rack; 305, gear. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0028] The present invention will be further described in detail below with reference to the drawings.
[0029] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious deformations. The basic principles defined in the following description can be used in other implementation schemes, deformation schemes, improvement schemes, equivalent schemes, and other technical schemes that do not deviate from the spirit and scope of the present invention.
[0030] Those skilled in the art should understand that in the disclosure of the present utility model, the orientations or positions indicated by terms such as "longitudinal", "lateral", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or position relationships shown in the drawings. It is only for the convenience of simplifying the description of the present utility model and does not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present utility model.
[0031] It can be understood that the term "one" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of the element can be multiple. The term "one" should not be construed as a limitation on the quantity. Embodiment
[0032] Please refer to Figures 1-4 , an energy-saving control device for a chiller of a subway air-conditioning system, comprising: a body bracket 1, on which a plurality of water pumps 2 are arranged. A switching valve 203 is connected to each water pump 2, and a gear 305 is arranged on the switching valve 203. By arranging a plurality of water pumps 2 and switching valves 203, the system can flexibly adjust the number of water pumps 2 turned on according to the actual refrigeration demand and working load of the chiller. When the refrigeration demand is low, the number of water pumps 2 turned on can be reduced to avoid unnecessary energy waste.
[0033] It further includes a slider 303 arranged on one side of the switching valve 203. A rack 304 for driving the gear 305 to rotate and opening the switching valve 203 to make the water pump 2 operate is arranged on the slider 303. The design of the gear 305 on the switching valve 203 makes the opening and closing of the water pump 2 more accurate and can be finely adjusted according to the system requirements to ensure that the chiller always operates in the best state. Secondly, through the rack 304 being gradually driven by the slider 303, the switching valves 203 can be opened one by one. According to the actual refrigeration demand and load change of the chiller, the opening timing of each water pump 2 can be accurately controlled to ensure that the system always operates in the best state.
[0034] Among them, the water pump 2 is divided into two groups, namely the constantly operating water pump 2 and the intermittently operating water pump 2. These water pumps 2 continuously work during the operation of the system and are suitable for scenarios that require stable water flow or continuous water supply. For example, when the chiller is operating at a high load and requires a large amount of cooling water, the constantly operating water pump 2 can ensure a stable water flow supply and prevent the unit efficiency from decreasing due to excessive water temperature. The water pump 2 is intermittently turned on and off according to the system demand. When the load of the chiller is low or a large amount of cooling water is not required, the intermittently operating water pump 2 can reduce energy consumption and avoid unnecessary waste. At the same time, this also helps to reduce the wear of the water pump 2 and extend its service life. By reasonably allocating the working time and tasks of the constantly operating water pump 2 and the intermittently operating water pump 2, the optimization of the system energy consumption can be achieved. When the system is at a high load, the constantly operating water pump 2 provides a stable water flow; when the system is at a low load, the intermittently operating water pump 2 reduces energy consumption, thus achieving the purpose of energy saving. The design of the intermittently operating water pump 2 can avoid the energy waste caused by the continuous operation of the water pump 2 when the system does not require a large amount of cooling water. This on-demand opening method helps to reduce unnecessary energy consumption.
[0035] It should be added that the movement of the gear 305 and the rack 304 is used to turn on the intermittently operating water pump 2. The rack 304 and the gear 305 above the water pump 2 are meshed with each other. The meshing transmission of the gear 305 and the rack 304 has high precision, which can ensure the accurate opening action of the water pump 2. By precisely controlling the moving distance and speed of the rack 304, the opening time and opening sequence of the water pump 2 can be accurately controlled. Compared with other transmission methods, the transmission error of the gear 305 and the rack 304 is smaller, which can avoid the problems of inaccurate opening, premature or late opening of the water pump 2 caused by transmission errors.
[0036] Furthermore, a compressor 101 is provided on one side of the body bracket 1 away from the water pump 2, and a water tank 201 is provided between the compressor 101 and the condenser 102. A number of partition plates 202 are provided in the water tank 201. The chambers separated by the partition plates 202 are connected to a number of water pumps 2. A fan 103 connected to the condenser 102 is provided above the water tank 201. As an important part of the cooling water circulation, the water tank 201 divides the cooling water into multiple independent chambers through the partition plates 202, so that each chamber can form an independent circulation loop with the corresponding water pump 2. This design helps to optimize the flow path of the cooling water and improve the cooling efficiency. The design of the partition plates 202 can also help to control the temperature of the cooling water in different chambers, avoid the influence of temperature fluctuations on the performance of the chiller, and ensure the stable operation of the unit.
[0037] Furthermore, fixed blocks 3 are symmetrically arranged on one side of the body bracket 1 close to the water pump 2, and a group of limiting rods 301 are arranged on the opposite surfaces of the fixed blocks 3. The limiting rods 301 are fixedly connected to the fixed blocks 3. There are two limiting rods 301, and shape memory alloys 302 are sleeved on the outer surfaces of both limiting rods 301. The shape memory alloy 302 is a martensitic phase change alloy with a regular atomic arrangement and a volume change of less than 0.5%. It will deform under external force and can return to its original shape under certain temperature conditions when the external force is removed. When the shape memory alloy 302 is in a high-temperature state, its crystal structure is austenite. During the cooling process, when the temperature drops below a specific temperature, the crystal structure of the shape memory alloy 302 will change from austenite to martensite, and at this time the alloy will exhibit an elastically deformed state. If it is heated above the transformation temperature again, the shape memory alloy 302 will change back to the austenite structure and return to its original shape. By controlling the temperature, the shape memory alloy 302 shrinks and promotes the gear 305 to be driven by the slider 303. The shape memory effect and superelasticity of the shape memory alloy 302 ensure the stability and accuracy of the gear 305 during movement. Even when affected by external interference or system fluctuations, it can quickly return to the predetermined position and maintain the stable operation of the system.
[0038] It should be added that the shape memory alloy 302 is arranged in a spring shape, and the limiting rod 301 is slidably connected to the slider 303. The shape memory alloy 302 is located between the fixed block 3 and the slider 303 on the side close to the normally open water pump 2. When the shape memory alloy 302 is heated and converted into austenite, it drives the slider 303 to move away from the normally open water pump 2, thereby opening the standby intermittent opening water pump 2 and prompting multiple water pumps 2 to work simultaneously. When there is a large amount of work to be processed, after the temperature rises, the switching between the normally open water pump 2 and the standby intermittent opening water pump 2 can be easily achieved by controlling the shape memory alloy 302. This flexibility enables the system to be optimally configured according to different working scenarios and requirements, improving the overall operation efficiency. When the normally open water pump 2 cannot meet the demand, the shape memory alloy 302 spring can quickly drive the slider 303 to open the standby intermittent opening water pump 2, ensuring that the system will not be damaged due to overload. This overload protection mechanism improves the reliability and stability of the system.
[0039] Among them, the ends of the shape memory alloy 302 are fixedly connected to the fixed block 3 and the slider 303 respectively. When the processing is completed, the shape memory alloy 302 cools down and changes from austenite to martensite, so that the rack 304 is driven by the slider 303 and returns to the initial state, closing the standby water pump 2. The standby water pump 2 automatically closes when it is not needed, avoiding unnecessary energy waste. This helps to reduce the operating cost of the system and improve the energy utilization efficiency, so as to achieve the effect of energy conservation and emission reduction.
[0040] It should be noted that in this text, 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. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.
[0041] Those skilled in the art should understand that the embodiments of the present utility model described above and shown in the accompanying drawings are only examples and do not limit the present utility model. The object of the present utility model has been fully and effectively achieved. The functions and structural principles of the present utility model have been demonstrated and explained in the embodiments, and without departing from the said principles, the embodiments of the present utility model can have any deformation or modification.
Claims
1. An energy-saving control device for a chiller of a subway air-conditioning system, characterized in that, Including: A body bracket (1), on which a number of water pumps (2) are arranged. A switching valve (203) is connected to each of the water pumps (2), and a gear (305) is arranged on the switching valve (203); A slider (303), which is arranged on one side of the switching valve (203). A rack (304) is arranged on the slider (303) for driving the gear (305) to rotate and opening the switching valve (203) to prompt the water pump (2) to operate.
2. The energy-saving control device for the chiller of a subway air-conditioning system according to claim 1, characterized in that: The water pumps (2) are divided into two groups, namely a normally open water pump (2) and an intermittently open water pump (2).
3. The energy-saving control device for the chiller of a subway air-conditioning system according to claim 2, characterized in that: The movement of the gear (305) and the rack (304) is used to open the intermittently open water pump (2), and the rack (304) meshes with the gear (305) above the water pump (2).
4. The energy-saving control device for the chiller of a subway air-conditioning system according to claim 1, characterized in that: A compressor (101) is arranged on one side of the body bracket (1) far from the water pump (2). A water tank (201) is arranged between the compressor (101) and the condenser (102).
5. An energy-saving control device for a chiller of a subway air-conditioning system according to claim 4, characterized in that: A number of partition plates (202) are arranged in the water tank (201), and the chambers separated by the partition plates (202) are connected to a number of water pumps (2).
6. The energy-saving control device for the chiller of a subway air-conditioning system according to claim 5, characterized in that: A blower (103) connected to the condenser (102) is arranged above the water tank (201).
7. An energy-saving control device for a chilled water unit of a subway air-conditioning system according to claim 1, characterized in that: Fixed blocks (3) are symmetrically arranged on one side of the body bracket (1) close to the water pump (2), and a set of limiting rods (301) are arranged on the opposite surfaces of the fixed blocks (3).
8. An energy-saving control device for a chiller of a subway air-conditioning system according to claim 7, characterized in that: The limiting rods (301) are fixedly connected to the fixed blocks (3). There are two limiting rods (301), and shape memory alloys (302) are sleeved on the outer surfaces of both limiting rods (301).
9. An energy-saving control device for a chiller of a subway air-conditioning system according to claim 8, characterized in that: The shape memory alloys (302) are arranged in a spring shape. The limiting rods (301) are slidably connected to the slider (303), and the shape memory alloys (302) are located between the fixed block (3) and the slider (303) on the side close to the normally open water pump (2).
10. An energy-saving control device for a chilled water unit of a subway air-conditioning system according to claim 9, characterized in that: The end parts of the shape memory alloys (302) are fixedly connected to the fixed block (3) and the slider (303) respectively.