Gradient cooling magnetic suspension water chilling unit with cold accumulation function

Abstract

The invention discloses a cascade cooling magnetic suspension water chilling unit with a cold accumulation function, and relates to the technical field of air conditioner refrigeration. The water chilling unit comprises a water inlet pipeline, a water outlet pipeline, a plurality of water chilling unit assemblies and at least one cold storage tank. The water chilling unit assembly comprises a natural cooling assembly, an evaporator, a compressor communicated with the evaporator, a condenser communicated with the compressor and a first drying filter communicated with the condenser, and the first drying filter is communicated with the evaporator. The cascade cooling of the water system is realized by connecting the refrigerating systems in series, cold water with large temperature difference is prepared, the flow of the water system is reduced, and the conveying energy consumption of the system is further reduced; the cold storage tank is arranged on the water supply pipe, so that a natural cooling mode can be stably switched to a mechanical refrigeration mode; while energy is saved and consumption is reduced, the running reliability of the unit is improved, and the method is more suitable for wide application scenes.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioning and refrigeration, and in particular relates to a step-cooling magnetic suspension chiller with cold storage. Background Art

[0002] The heat dissipation of servers in data centers is getting higher and higher, and the cooling demand of data rooms is also increasing. For large air-conditioning water systems, the traditional supply and return water temperature difference is small, and the system water flow is large, resulting in not only a large pipe diameter for the entire water system, but also higher transmission energy consumption. Chillers are crucial in the cooling system of data centers, and the mode switching of the units has a great impact on the safe and stable operation of the entire data center. Therefore, it is particularly important to ensure that the chiller switches smoothly in various modes while saving energy and reducing consumption.

[0003] With the development of information technology, the heat dissipation demand of data centers is increasing. The supply and return water temperature difference of traditional data centers is 5-8℃. The temperature difference is small, the flow rate is large, and the transmission energy consumption is high.

[0004] Traditional chillers can only produce cold water with a lower temperature difference, but cannot produce cold water with a larger temperature difference, resulting in large air-conditioning water systems with large water flow, high transportation energy consumption, and large initial investment. In addition, traditional chillers do not have cold storage tanks. When the ambient temperature is low, they can neither store excess cold nor give the compressor more startup time when switching modes to ensure smooth switching of the unit mode. Summary of the invention

[0005] Based on the above deficiencies in the prior art, the technical problem solved by the present invention is to provide a stepped cooling magnetic levitation chiller with cold storage. Through stepped cooling, a larger supply and return water temperature difference can be achieved, the system water flow rate can be reduced, the transportation energy consumption of the water system can be greatly reduced, and the initial investment of the air-conditioning system can be reduced. While saving energy and reducing consumption, the reliability of the unit operation is increased, and it is more suitable for a wide range of application scenarios.

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention provides a stepped cooling magnetic levitation chiller with cold storage, comprising: an inlet pipe, an outlet pipe, multiple chiller components and at least one cold storage tank; the chiller component comprises a natural cooling component, an evaporator, a compressor connected to the evaporator, a condenser connected to the compressor, and a first drying filter connected to the condenser, and the first drying filter is connected to the evaporator; a first branch pipe is connected between the evaporators on two adjacent chiller components, and the evaporator on the chiller component at the end is connected to the outlet pipe, and the evaporator on the chiller component at the beginning is connected to the inlet pipe; a second branch pipe is connected to the inlet pipe, the second branch pipe is connected to the natural cooling components on multiple chiller components, and a third branch pipe is connected between the natural cooling component and the outlet pipe; a fourth branch pipe is connected between the cold storage tank and the outlet pipe.

[0007] Optionally, the connection node between the water inlet pipeline and the second branch pipe is set as a first node, and an electric three-way valve is provided on the first node.

[0008] Optionally, the natural cooling component includes a natural cooling coil and a fan, the natural cooling coil and the fan are both arranged on the condenser, and the second branch pipe and the third branch pipe are both connected to the natural cooling coil.

[0009] Optionally, a fifth branch pipe is connected between the condenser and the evaporator, the first drying filter is connected in series to the fifth branch pipe, and the fifth branch pipe is also connected to an electronic expansion valve and a ball valve, and the first drying filter is located between the electronic expansion valve and the ball valve.

[0010] Optionally, a sixth branch pipe is connected between the fifth branch pipe and the compressor, and the sixth branch pipe is connected to a second drying filter.

[0011] Optionally, a seventh branch pipe is connected between the compressor and the condenser.

[0012] Optionally, an eighth branch pipe and a ninth branch pipe are connected between the seventh branch pipe and the fifth branch pipe, and the eighth branch pipe and the ninth branch pipe are connected in parallel.

[0013] Optionally, the ninth branch pipe is connected to a first solenoid valve and a first ball valve.

[0014] Optionally, the eighth branch pipe is connected to a second solenoid valve and a second ball valve.

[0015] Optionally, the fourth branch pipe is connected to an electric regulating valve.

[0016] After adopting the above technical solution, the step-cooling magnetic suspension chiller with cold storage of the present invention has the following beneficial effects compared with the prior art:

[0017] 1. The present invention realizes step cooling of the water system by connecting the refrigeration system in series, produces cold water with a large temperature difference, reduces the flow of the water system, and thus reduces the system's transportation energy consumption; by arranging a cold storage tank on the water supply pipe, it is ensured that the natural cooling mode can be smoothly switched to the mechanical refrigeration mode; while saving energy and reducing consumption, the present invention increases the reliability of the unit operation and is more suitable for a wide range of application scenarios.

[0018] 2. The present invention can reduce initial investment and lower transportation energy consumption: The present invention achieves a larger supply and return water temperature difference through step cooling, reduces the system water flow, greatly reduces the transportation energy consumption of the water system, and reduces the initial investment of the air-conditioning system.

[0019] 3. The present invention can improve the reliability of the unit. By arranging a cold storage tank on the water supply pipe, the excess cold in the natural cooling mode is stored in the cold storage tank. When the ambient temperature gradually rises, the cold storage tank is cooled first to give the compressor system more startup time, thereby ensuring the safety of the unit switching from the natural cooling mode to the mechanical refrigeration mode.

[0020] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following is a detailed description in combination with the preferred embodiments and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0022] Figure 1 It is a structural schematic diagram of the step-cooling magnetic suspension chiller with cold storage of the present invention.

[0023] Among them, 1-cold storage tank, 2-electric regulating valve, 3-evaporator, 4-compressor, 5-second solenoid valve, 6-second ball valve, 7-first solenoid valve, 8-first ball valve, 9-second drying filter, 10-electronic expansion valve, 11-natural cooling coil, 12-fan, 13-first drying filter, 14-ball valve, 15-condenser, 16-electric three-way valve. DETAILED DESCRIPTION

[0024] The following is a detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings, which is a part of this specification and illustrates the principles of the invention through examples. Other aspects, features and advantages of the present invention will become clear from the detailed description. In the referenced drawings, the same or similar components in different figures are represented by the same reference numerals.

[0025] Refer to the following Figure 1The specific structure of the step-cooling magnetic suspension chiller with cold storage of the present invention is described.

[0026] like Figure 1 As shown, the step-cooling magnetic suspension chiller with cold storage of the present invention comprises: a water inlet pipeline, a water outlet pipeline, a plurality of chiller components and at least one cold storage tank 1.

[0027] The present invention can improve the reliability of the unit. By arranging a cold storage tank 1 on the water supply pipe, the excess cold in the natural cooling mode is stored in the cold storage tank 1. When the ambient temperature gradually increases, the cold storage tank 1 is cooled first, giving the compressor system more startup time, thereby ensuring the safety of the unit switching from the natural cooling mode to the mechanical refrigeration mode.

[0028] Among them, the chiller component includes a natural cooling component, an evaporator 3, a compressor 4 connected to the evaporator 3, a condenser 15 connected to the compressor 4, and a first drying filter 13 connected to the condenser 15, and the first drying filter 13 is connected to the evaporator 3.

[0029] The evaporators 3 on two adjacent chiller assemblies are connected by a first branch pipe, and the evaporator 3 on the chiller assembly at the end is connected to the water outlet pipeline, and the evaporator 3 on the chiller assembly at the beginning is connected to the water inlet pipeline.

[0030] The water inlet pipeline is connected with a second branch pipe, which is connected with the natural cooling components on the multiple chiller components, and a third branch pipe is connected between the natural cooling components and the water outlet pipeline. A fourth branch pipe is connected between the cold storage tank 1 and the water outlet pipeline.

[0031] The present invention realizes step cooling of the water system by connecting the refrigeration system in series, produces cold water with a large temperature difference, reduces the flow of the water system, and thus reduces the system's transportation energy consumption; by arranging a cold storage tank 1 on the water supply pipe, it is ensured that the natural cooling mode can be smoothly switched to the mechanical refrigeration mode; while saving energy and reducing consumption, the present invention increases the reliability of the unit operation and is more suitable for a wide range of application scenarios. The present invention realizes a large supply and return water temperature difference through step cooling, reduces the system water flow, greatly reduces the water system's transportation energy consumption, and reduces the initial investment of the air conditioning system.

[0032] like Figure 1 As shown, in this embodiment, the connection node between the water inlet pipeline and the second branch pipe is set as a first node, and an electric three-way valve 16 is arranged on the first node.

[0033] like Figure 1 As shown, the natural cooling component of this embodiment includes a natural cooling coil 11 and a fan 12 . The natural cooling coil 11 and the fan 12 are both arranged on the condenser 15 , and the second branch pipe and the third branch pipe are both connected to the natural cooling coil 11 .

[0034] like Figure 1 As shown, in this embodiment, a fifth branch pipe is connected between the condenser 15 and the evaporator 3, the first drying filter 13 is connected in series to the fifth branch pipe, and the fifth branch pipe is also connected to the electronic expansion valve 10 and the ball valve 14, and the first drying filter 13 is located between the electronic expansion valve 10 and the ball valve 14.

[0035] like Figure 1 As shown, the fifth branch pipe of this embodiment is connected to the compressor 4 with the sixth branch pipe, and the sixth branch pipe is connected to the second drying filter 9. The compressor 4 is connected to the condenser 15 with the seventh branch pipe. The eighth branch pipe and the ninth branch pipe are connected to the fifth branch pipe, and the eighth branch pipe and the ninth branch pipe are connected in parallel. The first solenoid valve 7 and the first ball valve 8 are connected to the ninth branch pipe. The second solenoid valve 5 and the second ball valve 6 are connected to the eighth branch pipe.

[0036] like Figure 1 As shown, the fourth branch pipe of this embodiment is connected to the electric regulating valve 2.

[0037] The present invention realizes the production of water with a large temperature difference and ensures the reliability of unit mode switching by connecting multiple compressor refrigeration systems in series and arranging a cold storage tank on the water supply pipe. The specific technical scheme is as follows:

[0038] like Figure 1 As shown, the magnetic levitation chiller is running. In the mechanical refrigeration mode, the return water returns to the magnetic levitation chiller through the water inlet pipeline, the electric three-way valve 16 is reversed, and the return water flows to the evaporators 3 of the three refrigeration cycles in turn. After the return water is cooled, it is supplied to the end through the outlet pipeline. In this mode, the electric regulating valve 2 is closed, and the refrigerant absorbs the heat of water in the evaporator 3 and evaporates, and then enters the compressor 4. The compressed refrigerant enters the condenser 15, and after being cooled, it passes through the ball valve 14, the first drying filter 13, and the electronic expansion valve 10, and finally enters the evaporator 3 to complete a refrigeration cycle.

[0039] like Figure 1 As shown, in the natural cooling mode, the compressor 4 is turned off, the electric three-way valve is switched 16, the return water flows to the natural cooling coil 11, the fan 12 adjusts the speed according to the outdoor temperature to cool the return water, and the cooled return water is supplied to the end through the outlet pipe. The electric regulating valve 2 is adjusted according to the ambient temperature. As the ambient temperature decreases, the excess cold water is stored in the cold storage tank 1.

[0040] When switching from natural cooling mode to mechanical refrigeration mode, compressor 4 is turned on, electric regulating valve 2 is fully opened, and cold storage tank 1 releases cold energy. Before cold storage tank 1 completely releases cold energy, compressor 4 is fully turned on and operates stably, electric regulating valve 2 is closed, electric three-way valve 16 is switched in reverse direction, and magnetic suspension cold water enters mechanical refrigeration mode.

[0041] It should be noted that all electrical devices involved in this application can be powered by batteries or external power supplies.

[0042] The present invention designs multiple circulation systems in the chiller, and the evaporation temperature of each circulation system is reduced one by one. The return water is cooled by the joint cooling of multiple systems to obtain a large temperature difference, thereby realizing a system with a large temperature difference and a small flow rate, reducing the transmission energy consumption, and setting a cold storage tank 1 on the water supply pipe of the unit to collect the excess cold in the natural cooling mode. When the ambient temperature gradually rises and the natural cooling mode switches to the mechanical refrigeration mode, the cold storage tank 1 first releases the stored cold to give the compressor 4 more startup time to ensure that the unit can switch smoothly.

[0043] The above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and changes can be made without departing from the principle of the present invention, and these improvements and changes are also regarded as the protection scope of the present invention.

Claims

1. A step-cooling magnetic levitation chiller with cold storage, characterized in that: include: A water inlet pipeline, a water outlet pipeline, a plurality of chiller components and at least one cold storage tank (1); The chiller assembly comprises a natural cooling assembly, an evaporator (3), a compressor (4) connected to the evaporator (3), a condenser (15) connected to the compressor (4), and a first drying filter (13) connected to the condenser (15), wherein the first drying filter (13) is connected to the evaporator (3); A first branch pipe is connected between the evaporators (3) on two adjacent chiller assemblies, and the evaporator (3) on the chiller assembly at the end is connected to the water outlet pipeline, and the evaporator (3) on the chiller assembly at the beginning is connected to the water inlet pipeline; The water inlet pipeline is connected with a second branch pipe, the second branch pipe is connected with the natural cooling components on the multiple chiller components, and a third branch pipe is connected between the natural cooling components and the water outlet pipeline; A fourth branch pipe is connected between the cold storage tank (1) and the water outlet pipeline.

2. The step-cooling magnetic suspension chiller with cold storage as claimed in claim 1, characterized in that: The connection node between the water inlet pipeline and the second branch pipe is set as a first node, and an electric three-way valve (16) is arranged on the first node.

3. The step-cooling magnetic suspension chiller with cold storage as claimed in claim 1, characterized in that: The natural cooling component comprises a natural cooling coil (11) and a fan (12); the natural cooling coil (11) and the fan (12) are both arranged on a condenser (15); and the second branch pipe and the third branch pipe are both connected to the natural cooling coil (11).

4. The step-cooling magnetic suspension chiller with cold storage as claimed in claim 1, characterized in that: A fifth branch pipe is connected between the condenser (15) and the evaporator (3), the first drying filter (13) is connected in series to the fifth branch pipe, and the fifth branch pipe is also connected to an electronic expansion valve (10) and a ball valve (14), and the first drying filter (13) is located between the electronic expansion valve (10) and the ball valve (14).

5. The step-cooling magnetic suspension chiller with cold storage as claimed in claim 4, characterized in that: A sixth branch pipe is connected between the fifth branch pipe and the compressor (4), and the sixth branch pipe is connected to a second drying filter (9).

6. The step-cooling magnetic suspension chiller with cold storage as claimed in claim 5, characterized in that: A seventh branch pipe is connected between the compressor (4) and the condenser (15).

7. The step-cooling magnetic suspension chiller with cold storage as claimed in claim 6, characterized in that: The eighth branch pipe and the ninth branch pipe are connected between the seventh branch pipe and the fifth branch pipe, and the eighth branch pipe and the ninth branch pipe are connected in parallel.

8. The step-cooling magnetic suspension chiller with cold storage as claimed in claim 7, characterized in that: The ninth branch pipe is connected to a first electromagnetic valve (7) and a first ball valve (8).

9. The step-cooling magnetic suspension chiller with cold storage as claimed in claim 7, characterized in that: The eighth branch pipe is connected to a second electromagnetic valve (5) and a second ball valve (6).

10. The step-cooling magnetic suspension chiller with cold storage as claimed in claim 1, characterized in that: The fourth branch pipe is connected to an electric regulating valve (2).

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