Medical energy-saving water chilling unit

Abstract

A medical energy-saving water chilling unit is integrally mounted outdoors and comprises a cold water return pipe, a water return pipe temperature sensor, an electric three-way valve, an electric control cabinet, a natural cooling coil system, a Freon refrigerating system, a water supply pipe temperature sensor, a water tank, a water supply pump, a cold water supply pipe and an outdoor air temperature sensor. The natural cooling coil system utilizes outdoor low-temperature air to directly exchange heat with cold water to realize natural cooling, and comprises a natural cooling water inlet pipeline, a natural cooling coil and a natural cooling water outlet pipeline. The mode of combining natural cooling and Freon refrigeration is adopted, when the outdoor air temperature is low in winter and transition seasons, outdoor low-temperature air is used for directly exchanging heat with cold water of the cold water return pipe, natural cooling is achieved, use of a compressor or reduction of the power of the compressor is avoided, the operation time and power consumption of the compressor are effectively reduced, and the energy consumption of the compressor is reduced. And the annual refrigeration energy efficiency of the water chilling unit is improved, so that energy is saved, and the operation cost is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of medical energy-saving, and particularly relates to a medical energy-saving water chiller. BACKGROUND

[0002] The water chiller for cooling medical equipment usually adopts a water chiller with air cooling. Since the medical equipment is basically in operation throughout the year, the heat generated during the operation of the medical equipment needs to be dissipated in time. Therefore, the water chiller for cooling needs to be operated without stop throughout the year to ensure the safety and stability of the medical equipment. However, the continuous operation of the water chiller also leads to a relatively large annual power consumption of the water chiller and high operation cost. SUMMARY

[0003] In order to solve the above problems, the application provides a medical energy-saving water chiller.

[0004] The technical scheme of the application is as follows:

[0005] A medical energy-saving water chiller is installed as a whole outdoors, comprising a cold water return pipe 1, a return pipe temperature sensor ST1, an electric three-way valve 5, an electric control cabinet 7, a natural cooling coil system, a freon refrigeration system, a water supply pipe temperature sensor ST2, a water tank 6, a water supply pump 4, a cold water supply pipe 2 and an outdoor air temperature sensor ST3, wherein:

[0006] The cold water return pipe 1 is connected to the water outlet of the medical equipment and the input side of the water chiller, and the cold water supply pipe 2 is connected to the water inlet of the medical equipment and the output side of the water chiller;

[0007] On the input side of the water chiller, the return pipe temperature sensor ST1 and the electric three-way valve 5 are arranged in sequence on the cold water return pipe 1, two outlets of the electric three-way valve 5 are connected to the input end of the natural cooling coil system and the input end of the freon refrigeration system respectively, and the output end of the natural cooling coil system is connected to the input end of the freon refrigeration system;

[0008] On the output side of the water chiller, the output end of the freon refrigeration system is connected in sequence to the water supply pipe temperature sensor ST2, the water tank 6, the water supply pump 4 and the cold water supply pipe 2;

[0009] The return pipe temperature sensor ST1, the water supply pipe temperature sensor ST2, the outdoor air temperature sensor ST3, the electric three-way valve 5 and the water supply pump 4 are connected to the electric control cabinet 7 respectively.

[0010] Further, the natural cooling coil system directly exchanges heat between the outdoor low-temperature air and the cold water to achieve natural cooling, comprising a natural cooling water inlet pipe 8, a natural cooling coil 10 and a natural cooling water outlet pipe 9, which are connected in sequence, and specifically:

[0011] One end of the natural cooling water inlet pipe 8 is connected with the outlet of the electric three-way valve 5, and the other end is connected with the input end of the natural cooling coil 10. The output end of the natural cooling coil 10 is connected with one end of the natural cooling water outlet pipe 9, and the other end of the natural cooling water outlet pipe 9 is connected with the input end of the freon refrigeration system.

[0012] Further, the freon refrigeration system comprises two independent refrigeration subsystems, namely a freon refrigeration system a and a freon refrigeration system b, which are independent of each other, do not affect each other, and are backup for each other, and only one subsystem is operated at the same time, wherein:

[0013] The freon refrigeration system a comprises a first plate heat exchanger evaporator 11, a first compressor 12, a first condenser coil 13, a first dry filter 15, and a first expansion valve 16, which are connected in sequence; and further comprises a first condenser fan 14, which is arranged near the first condenser coil 13.

[0014] The freon refrigeration system b comprises a second plate heat exchanger evaporator 17, a second compressor 18, a second condenser coil 19, a second dry filter 21, and a second expansion valve 22, which are connected in sequence; and further comprises a second condenser fan 20, which is arranged near the second condenser coil 19.

[0015] The cold water side of the first plate heat exchanger evaporator 11 is connected in series with the cold water side of the second plate heat exchanger evaporator 17.

[0016] Further, the input of the cold water side of the first plate heat exchanger evaporator 11 is connected with the output of the electric three-way valve 5, and the output of the cold water side is connected with the input of the cold water side of the second plate heat exchanger evaporator 17.

[0017] Further, the first compressor 12 of the freon refrigeration system a, the first condenser fan 14, the second compressor 18 of the freon refrigeration system b, and the second condenser fan 20 are connected with the electric control cabinet 7.

[0018] Further, the first condenser fan 14 of the freon refrigeration system a and the second condenser fan 20 of the freon refrigeration system b also serve as fans of the natural cooling coil, and provide power for outdoor heat exchange air of the natural cooling coil system.

[0019] Further, a Y-type filter 3 is arranged in the cold water return pipe and located before the electric three-way valve 5, which is used for filtering particulate impurities in the cold water and ensuring the cleanliness of the cold water.

[0020] The advantages and beneficial effects of the present application are as follows:

[0021] This invention proposes a medical energy-saving chiller unit that combines natural cooling and Freon refrigeration. In winter and transitional seasons when the outdoor temperature is low, the unit utilizes the low-temperature outdoor air to directly exchange heat with the chilled water in the chilled water return pipe to achieve natural cooling. This avoids the use of a compressor or reduces the compressor power, effectively reducing the compressor's operating time and power consumption, improving the chiller unit's cooling efficiency throughout the year, thereby saving energy and reducing operating costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the medical energy-saving chiller unit in this application.

[0023] Figure label:

[0024] 1-Cold water return pipe, 2-Cold water supply pipe, 3-Y-type filter, 4-Water supply pump, 5-Electric three-way valve, 6-Water tank, 7-Electric control cabinet;

[0025] 8-Natural cooling water inlet pipe, 9-Natural cooling water outlet pipe, 10-Natural cooling coil;

[0026] 11-First plate heat exchanger evaporator, 12-First compressor, 13-First condenser coil, 14-First condenser fan, 15-First dryer filter, 16-First expansion valve;

[0027] 17-Second plate heat exchanger evaporator, 18-Second compressor, 19-Second condenser coil, 20-Second condenser fan, 21-Second dryer filter, 22-Second expansion valve;

[0028] ST1 - Return water pipe temperature sensor, ST2 - Supply water pipe temperature sensor, ST3 - Outdoor air temperature sensor. Detailed Implementation

[0029] The technical solutions provided in this application will be further described below with reference to specific embodiments and accompanying drawings. The advantages and features of this application will become clearer from the following description.

[0030] Example 1

[0031] like Figure 1 As shown, the medical energy-saving chiller unit is installed outdoors to provide cooling for medical equipment (not shown in the figure). It mainly includes: chilled water return pipe 1, Y-type filter 3, return pipe temperature sensor ST1, electric three-way valve 5, electrical control cabinet 7, natural cooling coil system, Freon refrigeration system, supply water pipe temperature sensor ST2, water tank 6, supply water pump 4, chilled water supply pipe 2, and outdoor air temperature sensor ST3. Among them:

[0032] The cold water return pipe 1 is connected to the water outlet of the medical equipment and the input side of the cold water unit, and the cold water supply pipe 2 is connected to the water inlet of the medical equipment and the output side of the cold water unit;

[0033] On the input side of the cold water unit, the Y-shaped filter 3, the return pipe temperature sensor ST1 and the electric three-way valve 5 are sequentially arranged on the cold water return pipe 1, two outlets of the electric three-way valve 5 are respectively connected to the input end of the natural cooling coil system and the input end of the freon refrigeration system, and the output end of the natural cooling coil system is connected to the input end of the freon refrigeration system.

[0034] On the output side of the cold water unit, the output end of the freon refrigeration system is sequentially connected to the water supply pipe temperature sensor ST2, the water tank 6, the water supply pump 4 and the cold water supply pipe 2.

[0035] The return pipe temperature sensor ST1, the water supply pipe temperature sensor ST2, the outdoor air temperature sensor ST3, the electric three-way valve 5 and the water supply pump 4 are respectively connected to the electric control cabinet 7.

[0036] Specifically, the natural cooling coil system directly exchanges heat between outdoor low-temperature air and cold water to achieve natural cooling, and includes a natural cooling water inlet pipeline 8, a natural cooling coil 10 and a natural cooling water outlet pipeline 9, which are sequentially connected; when the natural cooling coil system is running, the fan needs to be turned on to provide power for the outdoor heat exchange side air of the natural cooling coil.

[0037] Specifically, the freon refrigeration system includes two subsystems, namely a freon refrigeration system a and a freon refrigeration system b, and any subsystem meets the refrigeration capacity requirement of the cold water unit; the two subsystems are independent of each other, do not affect each other and are mutual backup, only one subsystem is running at the same time, and when one subsystem fails, the cold water unit automatically switches to the other subsystem, wherein:

[0038] The freon refrigeration system a includes a first plate heat exchanger evaporator 11, a first compressor 12, a first condensing coil 13, a first dry filter 15 and a first expansion valve 16, which are sequentially connected; and further includes a first condensing fan 14, which is arranged near the first condensing coil 13.

[0039] The freon refrigeration system b includes a second plate heat exchanger evaporator 17, a second compressor 18, a second condensing coil 19, a second dry filter 21 and a second expansion valve 22, which are sequentially connected; and further includes a second condensing fan 20, which is arranged near the second condensing coil 19.

[0040] The cold water side of the first plate heat exchanger evaporator 11 is connected in series with the cold water side of the second plate heat exchanger evaporator 17.

[0041] As an example, the input of the cold water side of the first plate heat exchanger evaporator 11 is connected with the outlet of the electric three-way valve 5, and the output of the cold water side is connected with the input of the cold water side of the second plate heat exchanger evaporator 17. In this case, the input of the cold water side of the first plate heat exchanger evaporator 11 is regarded as the input of the freon refrigeration system, and the natural cooling water outlet pipeline 9 of the natural cooling coil system is communicated with the input of the cold water side of the first plate heat exchanger evaporator 11.

[0042] The first compressor 12 of the freon refrigeration system a, the first condensing fan 14, and the second compressor 18 of the freon refrigeration system b, and the second condensing fan 20 are connected with the electric control cabinet 7 respectively.

[0043] Further, the first condensing fan 14 of the freon refrigeration system a and the second condensing fan 20 of the freon refrigeration system b also serve as the fan of the natural cooling coil, and provide the power for the outdoor heat exchange side air of the natural cooling coil system.

[0044] The electric control cabinet 7 integrates the control, protection and detection functions of the water chiller, including:

[0045] According to the temperature values measured by the return water pipe temperature sensor ST1, the water supply pipe temperature sensor ST2 and the outdoor air temperature sensor ST3, the opening and closing actions of the electric three-way valve 5 are controlled, the switching control between the natural cooling coil system and the freon refrigeration system of the water chiller refrigeration system is realized, the loading and unloading and start and stop of the first compressor 12 and the second compressor 18 are controlled, the speed regulation and start and stop of the first condensing fan 14 and the second condensing fan 20 are controlled, the switching and operation of the freon refrigeration system a and the freon refrigeration system b are realized, the start and stop of the water supply pump 4 are controlled, and the circulation flow of the cold water is realized.

[0046] Since the medical equipment has a higher requirement on the cold water quality, the cold water of the medical energy-saving water chiller of the utility model adopts deionized water, the Y-shaped filter 3 is arranged in the cold water return water pipe to filter the particulate impurities in the cold water, and the cold water quality cleanliness is ensured.

[0047] Since the medical equipment has a higher requirement on the cold water temperature precision, the water tank 6 is arranged in the unit to increase the system water capacity to ensure the stability of the system water supply temperature, and the natural cooling coil system and the freon refrigeration system are connected in series, when the natural cooling coil system can provide part of the cold quantity but cannot provide all the cold quantity, since the natural cooling coil system and the freon refrigeration system are connected in series, the water route switching is not needed, the freon refrigeration system can directly perform cold compensation, and the water supply temperature of the unit is further stabilized.

[0048] The operation mode of the medical energy-saving water chiller of the utility model is as follows:

[0049] Mode one: when the measured temperature of outdoor air temperature sensor ST3 is higher than the measured temperature of return water pipe temperature sensor ST1, electric three-way valve 5 switches to the circuit where freon refrigeration system is located, that is, the water inlet pipe connected with the cold water side of first plate heat exchanger evaporator 11 of freon refrigeration system a, and the energy-saving water chiller runs in freon refrigeration system cooling mode, high-temperature cold water returned from cold water return water pipe 1 is directly exchanged by first plate heat exchanger evaporator 11 of freon refrigeration system a and second plate heat exchanger evaporator 17 of freon refrigeration system b, and then becomes low-temperature cold water;

[0050] Since freon refrigeration system a and freon refrigeration system b are mutual standby, only one of freon refrigeration system a or freon refrigeration system b is started, and the other one is standby, and finally the low-temperature cold water reaches cold water supply pipe 2 through water tank 6 and water supply pump 4.

[0051] In this mode, freon refrigeration system bears 100% load.

[0052] Further, the measured temperature of water supply pipe temperature sensor ST2 can reach the set temperature value W1 by load reduction control of the compressor of freon refrigeration system.

[0053] Mode two: when the measured temperature of outdoor air temperature sensor ST3 is lower than the measured temperature of return water pipe temperature sensor ST1, electric three-way valve 5 switches to the circuit where natural cooling coil system is located, that is, the circuit connected with natural cooling water inlet pipe 8, and the energy-saving water chiller runs in natural cooling coil system mode, and low-temperature air is directly exchanged with cold water to realize natural cooling, at this time, first condensing fan 14 and second condensing fan 20 are in the open state; high-temperature cold water returned from cold water return water pipe 1 is exchanged by natural cooling coil 10 of natural cooling coil system, and then becomes low-temperature cold water, and the low-temperature cold water enters water tank 6 after being exchanged by the cold water side of first plate heat exchanger evaporator 11 of freon refrigeration system a and second plate heat exchanger evaporator 17 of freon refrigeration system b;

[0054] If the measured temperature of water supply pipe temperature sensor ST2 is higher than the set temperature value W1 after the exchange of natural cooling coil 10, freon refrigeration system a or freon refrigeration system b is started to perform cold supplement, only one of freon refrigeration system a or freon refrigeration system b is started, and finally the measured temperature of water supply pipe temperature sensor ST2 reaches the set temperature value W1;

[0055] When the measured temperature of the water supply pipe temperature sensor ST2 is detected to be lower than the set temperature value W1, the start-stop state of the first compressor 12 of the freon refrigeration system a and the second compressor 18 of the freon refrigeration system b is continuously detected, when any one of them is in the running state, the electric control cabinet 7 carries out the load reduction control on the compressor of the freon refrigeration system; when it is detected that the compressors of the freon refrigeration systems a and b are both in the closed state, at this time, the speed control is simultaneously carried out on the first condensing fan 14 and the first condensing fan 20, until the measured temperature of the water supply pipe temperature sensor ST2 reaches the set temperature value W1, and finally reaches the cold water supply pipe 2 through the water tank 6 and the water supply pump 4.

[0056] The medical energy-saving type cold water unit of the present application is suitable for the Yangtze River basin region or the east China, north China, northwest China and northeast China regions north of the Yangtze River basin, and is still suitable for the medical equipment field of using the traditional cold water unit to supply refrigerated water in winter.

[0057] The above description is only a description of the preferred embodiments of the present application, and is not any limitation on the scope of the present application. Any modification or modification made by any person skilled in the art according to the above disclosed technical content should be regarded as an equivalent effective embodiment, and belongs to the protection scope of the technical scheme of the present application.

Claims

1. A medical energy-saving water chiller, which is installed as a whole in an outdoor, characterized in that, The cold water return pipe (1), the return pipe temperature sensor ST1, the electric three-way valve (5), the electric control cabinet (7), the natural cooling coil system, the freon refrigeration system, the water supply pipe temperature sensor ST2, the water tank (6), the water supply pump (4), the cold water supply pipe (2) and the outdoor air temperature sensor ST3 are connected in sequence. The cold water return pipe (1) is connected to the water outlet of the medical equipment and the input side of the cold water unit, and the cold water supply pipe (2) is connected to the water inlet of the medical equipment and the output side of the cold water unit. On the input side of the cold water unit, the return pipe temperature sensor ST1 and the electric three-way valve (5) are arranged on the cold water return pipe (1) in sequence, two outlets of the electric three-way valve (5) are connected to the input end of the natural cooling coil system and the input end of the freon refrigeration system respectively, and the output end of the natural cooling coil system is connected to the input end of the freon refrigeration system. On the output side of the cold water unit, the output end of the freon refrigeration system is connected to the water supply pipe temperature sensor ST2, the water tank (6), the water supply pump (4) and the cold water supply pipe (2) in sequence. The return pipe temperature sensor ST1, the water supply pipe temperature sensor ST2, the outdoor air temperature sensor ST3, the electric three-way valve (5) and the water supply pump (4) are connected to the electric control cabinet (7) respectively.

2. The medical energy-efficient chiller of claim 1, wherein, The natural cooling coil system directly exchanges heat between outdoor low-temperature air and cold water to achieve natural cooling, and comprises a natural cooling water inlet pipe (8), a natural cooling coil (10) and a natural cooling water outlet pipe (9) connected in sequence. One end of the natural cooling water inlet pipe (8) is connected to the outlet of the electric three-way valve (5), the other end is connected to the input end of the natural cooling coil (10), the output end of the natural cooling coil (10) is connected to one end of the natural cooling water outlet pipe (9), and the other end of the natural cooling water outlet pipe (9) is connected to the input end of the freon refrigeration system.

3. The medical energy-efficient chiller of claim 1, wherein, The freon refrigeration system comprises two independent refrigeration subsystems, namely freon refrigeration system a and freon refrigeration system b, which are independent of each other, do not affect each other and are standby for each other, and only one subsystem operates at the same time. The freon refrigeration system a comprises a first plate heat exchanger evaporator (11), a first compressor (12), a first condensing coil (13), a first drying filter (15) and a first expansion valve (16) connected in sequence, and further comprises a first condensing fan (14) arranged near the first condensing coil (13). The freon refrigeration system b comprises a second plate heat exchanger evaporator (17), a second compressor (18), a second condensing coil (19), a second drying filter (21) and a second expansion valve (22) connected in sequence, and further comprises a second condensing fan (20) arranged near the second condensing coil (19). The cold water side of the first plate heat exchanger evaporator (11) is connected in series with the cold water side of the second plate heat exchanger evaporator (17).

4. The medical energy-saving cold water unit of claim 3, wherein The first plate heat exchanger evaporator (11) is connected with the outlet of the electric three-way valve (5) at the input of the cold water side, and connected with the input of the second plate heat exchanger evaporator (17) at the output of the cold water side.

5. The medical energy-saving water chiller of claim 3, wherein, The first compressor (12) and the first condenser fan (14) of the freon refrigeration system a and the second compressor (18) and the second condenser fan (20) of the freon refrigeration system b are respectively connected with the electric control cabinet (7).

6. The medical energy-saving water chiller of claim 3, wherein, The first condenser fan (14) of the freon refrigeration system a and the second condenser fan (20) of the freon refrigeration system b also serve as the fans of the natural cooling coil and provide the outdoor heat exchange side air of the natural cooling coil system with power.

7. The medical energy-saving water chiller of claim 1, wherein, The Y-type filter (3) is arranged in the cold water return pipe and located before the electric three-way valve (5) to filter the particulate impurities in the cold water and ensure the cleanliness of the cold water.

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