Horizontal energy storage water chilling unit

Abstract

A horizontal energy storage water chilling unit relates to the technical field of refrigeration equipment and is mainly structurally characterized in that hollowed-out grid openings are formed in a front end face sheet metal part and a rear end face sheet metal part of a unit shell, and a unit air inlet and a unit air outlet are formed in the hollowed-out grid openings respectively; the fan is fixedly mounted in the rear area of the inner cavity of the unit shell and is close to the unit air outlet; the refrigerating system is fixedly installed in the middle area of an inner cavity of the unit shell and comprises an evaporation heat exchanger, a compressor, a condensation heat exchanger and a throttling device. The cold carrying system is fixedly installed on the right side area of the front portion of an inner cavity of the unit shell and comprises a circulating water pump, an expansion liquid supplementing device and an electric heating device. The electric control box is fixedly installed in the front left area of the inner cavity of the unit shell. The unit shell, the refrigerating system, the cold carrying system, the fan and the electric control box are integrated into a whole, and meanwhile, the whole machine adopts a horizontal layout form, so that the structural layout is more compact, and the unit is suitable for various high-battery-density energy storage containers.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration equipment, in particular to a horizontal energy storage chiller. Background Art

[0002] With the continuous development of the energy storage industry, the number of battery packs at the end of energy storage containers is increasing, and the charge and discharge power density of the batteries is getting higher and higher, posing a severe challenge to energy storage temperature control products. Currently, common solutions for energy storage temperature control products are inlaid chillers and floor-standing cabinet chillers. Both chillers are vertically designed, with large volumes and are difficult to be applied in energy storage containers. Summary of the Utility Model

[0003] Based on the above problems, the purpose of the utility model is to provide a horizontal energy storage chiller with high integration and a compact structural space, which can be applied to energy storage containers with a high battery density, provide a reasonable charge and discharge environment for the batteries inside the container, and improve the service life of the batteries.

[0004] The technical solution adopted by the utility model is a horizontal energy storage chiller, which includes a unit housing, a refrigeration system, a secondary coolant system, a fan, and an electric control box. Among them,

[0005] The specific structure of the unit housing is as follows:

[0006] Hollow grid openings are provided on the front-end surface sheet metal part and the rear-end surface sheet metal part, respectively forming the unit air inlet and the unit air outlet. L-shaped fixed sheet metal parts are fixedly connected to the left and right sides of the front-end surface sheet metal part. Positioning and installation holes are provided on the front panel of the fixed sheet metal part for positioning, installing, and fixing the unit. The left and right side sheet metal parts are connected to the frame of the unit housing by bolts. The left and right sides are used as maintenance surfaces. When problems occur during operation, the unit can be pulled out and the left and right side sheet metal parts can be removed to repair and maintain the components inside the unit. The top sheet metal part and the bottom sheet metal part provide support for the unit;

[0007] The fan is fixedly installed in the rear area of the inner cavity of the unit housing and close to the unit air outlet. The air outlet direction of the fan is towards the unit air outlet. The fan provides power for the air flow inside the chiller. After the fan is turned on, the inside of the chiller becomes a negative pressure area. The air outside the chiller is sucked in through the hollow grid opening of the front-end surface sheet metal part of the unit, passes through the condensation heat exchanger in the refrigeration system, and then passes through the fan and is blown out through the hollow grid opening of the rear-end surface sheet metal part of the unit;

[0008] The refrigeration system is fixedly installed in the middle area of the inner cavity of the unit housing and includes an evaporation heat exchanger, a compressor, a condensation heat exchanger, and a throttling device. Its specific structure is as follows:

[0009] The condensation heat exchanger is close to the blower and is arranged horizontally parallel to the rear end face sheet metal part. The compressor is located in front of the condensation heat exchanger and is arranged horizontally in a horizontal position. The evaporation heat exchanger is also located in front of the condensation heat exchanger and is located on the right side of the compressor. The refrigerant outlet of the evaporation heat exchanger is connected to the refrigerant inlet of the compressor through a first connecting pipe. The refrigerant outlet of the compressor is connected to the refrigerant inlet of the condensation heat exchanger through a second connecting pipe. The refrigerant outlet of the condensation heat exchanger is sequentially connected to the refrigerant inlet of the evaporation heat exchanger through a third connecting pipe, a throttling device, and a fourth connecting pipe.

[0010] The secondary coolant system is fixedly installed in the front right area of the inner cavity of the unit housing and includes a circulating water pump, an expansion and liquid supplementing device, and an electric heating device. Its specific structure is as follows:

[0011] The electric heating device is located in front of the evaporation heat exchanger and is opposite to the secondary coolant outlet at the lower part of the side wall of the evaporation heat exchanger. The expansion and liquid supplementing device is located on the left side of the electric heating device. The circulating water pump is located above and to the left of the expansion and liquid supplementing device. The water return port of the unit is connected to the first port of a three-way through a main water return pipe. The second port of the three-way is connected to the expansion and liquid supplementing device through a second water return branch pipe. The third port of the three-way is connected to the water inlet of the circulating water pump through a first water return branch pipe. The water outlet of the circulating water pump is connected to the secondary coolant inlet at the upper part of the side wall of the evaporation heat exchanger through a main water supply pipe. The secondary coolant outlet of the evaporation heat exchanger is connected to the water supply port of the unit through the electric heating device. The liquid supplement and discharge port of the unit is connected to the first water return branch pipe through a liquid supplement and discharge pipe. The water return port, the water supply port, and the liquid supplement and discharge port of the unit extend out of the right side of the front end face sheet metal part.

[0012] The function of the liquid supplement and discharge port is as follows: When the unit is initially installed and filled with liquid on site, liquid is added from here; after production line production debugging, the coolant is discharged from here and then transported; during use, when there is liquid leakage or shortage, liquid is supplemented or added from here.

[0013] The secondary coolant system is a closed system, and the volume change caused by the temperature change of the secondary coolant is offset by the expansion and liquid supplementing device. Conventional water, ethylene glycol, diethylene glycol, and ethanol can all be used as secondary coolants. Considering the limitations of the application scenario, the energy storage chiller requires a liquid with a low freezing point as the secondary coolant. Therefore, the present utility model can use ethylene glycol, ethanol, and diethylene glycol as secondary coolants.

[0014] The electric control box is fixedly installed in the front left area of the inner cavity of the unit housing. A window is provided on the left side of the front panel sheet metal part, and the front panel of the electric control box is exposed through the window to show the electrical interface. The electrical interface includes a main power interface, a communication interface, and a debugging interface. All the control devices of the water chiller are integrated in the electric control box. The electric control box precisely controls the refrigeration system, the secondary coolant system, and the fan of the water chiller by collecting and reading the data of various temperature and pressure sensors arranged on the pipeline. After the unit is pulled out, the side sheet metal part on the left side of the unit and the cover plate of the electric control box can be removed to maintain the electrical components in the electric control box.

[0015] Furthermore, considering the type of the fan and the air flow organization form before and after the fan, a hollow grid opening is also provided in the rear area of the top sheet metal part of the unit housing. The hollow grid opening is located above the fan.

[0016] Furthermore, a pull ring is fixedly installed on the front panel of the fixed sheet metal part, which is convenient for pulling out the whole water chiller during maintenance.

[0017] Furthermore, heat insulation cotton is also pasted on the surface of the evaporation heat exchanger.

[0018] Furthermore, the evaporation heat exchanger is a plate heat exchanger or a shell and tube heat exchanger.

[0019] Furthermore, a sealing strip is also pasted on the top of the condensation heat exchanger. The sealing strip can prevent air leakage.

[0020] Furthermore, the condensation heat exchanger is a copper fin type or a microchannel type.

[0021] Furthermore, the throttling device is an electronic expansion valve or a thermal expansion valve.

[0022] Furthermore, the first return water branch pipe and the water supply main pipe are flexible hoses. The inlet and outlet of the circulation water pump are connected by flexible hoses, which can reduce the influence of the vibration during the operation of the water pump on the secondary coolant system pipeline.

[0023] Furthermore, the unit return water port and the unit water supply port are NW quick connectors or CQC quick connectors, and the unit make-up and drainage port is a SAE quick connector. Using standard quick connectors can reduce the operation procedures during on-site installation.

[0024] The beneficial effects of the present utility model are as follows:

[0025] Compared with the traditional vertical water chiller solution, the horizontal water chiller of the present utility model integrates the unit housing, the refrigeration system, the secondary coolant system, the fan, and the electric control box. At the same time, the whole machine adopts a horizontal layout form, and the structural layout is more compact, which is suitable for various high battery density energy storage containers. Description of the Drawings

[0026] Figure 1 Schematic three-dimensional view of the appearance of the embodiment of the present utility model;

[0027] Figure 2 Top view after opening the top sheet metal part of the embodiment of the present utility model;

[0028] Figure 3 Schematic three-dimensional structure diagram of the refrigeration system of the embodiment of the present utility model;

[0029] Figure 4 Schematic three-dimensional structure diagram of the secondary coolant system and the evaporation heat exchanger of the embodiment of the present utility model. Detailed implementation manners

[0030] In order to more clearly understand the above objects, features and advantages of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0031] Figures 1 to 4 A specific implementation manner of the horizontal energy storage water chiller of the present utility model is shown, including a unit housing 1, a refrigeration system 2, a secondary coolant system 3, a fan 4, and an electric control box 5. Among them,

[0032] The specific structure of the unit housing 1 is as follows:

[0033] Hollow grid openings are provided on the front end face sheet metal part 101 and the rear end face sheet metal part 102, forming a unit air inlet and a unit air outlet respectively. L-shaped fixing sheet metal parts 103 are fixedly connected to the left and right sides of the front end face sheet metal part 101. Positioning and installation holes 103a are provided on the front panel of the fixing sheet metal part 103 for positioning, installing and fixing the unit. A pull ring 106 is also fixedly installed on the front panel of the fixing sheet metal part 103. The left and right side sheet metal parts 104 are connected to the frame of the unit housing 1 by bolts; a hollow grid opening is also provided in the rear area of the top sheet metal part 105, and the hollow grid opening is located above the fan 4;

[0034] The fan 4 is fixedly installed in the rear area of the inner cavity of the unit housing 1 and close to the unit air outlet, and the air outlet direction of the fan 4 is towards the unit air outlet;

[0035] The refrigeration system 2 is fixedly installed in the middle area of the inner cavity of the unit housing 1, and includes an evaporation heat exchanger 201, a compressor 202, a condensation heat exchanger 203, and a throttling device 204. Its specific structure is as follows:

[0036] The copper-fin condensing heat exchanger 203 is arranged horizontally near the fan 4 and parallel to the rear end sheet metal 102. A sealing strip is also attached to the top of the condensing heat exchanger 203. The compressor 202 is located in front of the condensing heat exchanger 203 and is arranged horizontally. The evaporating heat exchanger 201 is also located in front of the condensing heat exchanger 203 and on the right side of the compressor 202. The surface of the evaporating heat exchanger 201 is also attached with thermal insulation cotton. The refrigerant outlet of the evaporating heat exchanger 201 is connected to the refrigeration outlet of the compressor 202 through the first connecting pipe 205. The refrigerant inlet of the compressor 202 is connected to the refrigerant inlet of the condensing heat exchanger 203 through the second connecting pipe 206, and the refrigerant outlet of the condensing heat exchanger 203 is connected to the refrigerant inlet of the evaporating heat exchanger 201 through the third connecting pipe 207, the throttling device 204 and the fourth connecting pipe 208 in sequence; the throttling device 204 is an electronic expansion valve; the evaporating heat exchanger 201, the compressor 202, and the condensing heat exchanger 203 are all connected to the positioning sheet metals set at the corresponding positions in the unit casing 1 by bolts;

[0037] The cooling system 3 is fixedly installed in the front right area of ​​the inner cavity of the unit housing 1, and includes a circulating water pump 301, an expansion and liquid replenishing device 302, and an electric heating device 303. Its specific structure is as follows:

[0038] The electric heating device 303 is located in front of the evaporative heat exchanger 201 and is directly opposite to the refrigerant outlet 2011 at the lower part of the side wall of the evaporative heat exchanger 201. The expansion and replenishment device 302 is located on the left side of the electric heating device 303. The circulating water pump 301 is located above the left side of the expansion and replenishment device 302. The unit return water port 304 is connected to the first port of the tee 308 through the return water main pipe 307, the second port of the tee 308 is connected to the expansion and replenishment device 302 through the second return water branch pipe 309, the third port of the tee 308 is connected to the water inlet of the circulating water pump 301 through the first return water branch pipe 310, and the water outlet of the circulating water pump 301 is connected to the refrigerant inlet 2012 at the upper part of the side wall of the evaporative heat exchanger 201 through the water supply main pipe 311. The first return water branch pipe 312 is connected to the refrigerant outlet 2012 at the upper part of the side wall of the evaporative heat exchanger 201. 10 and the water supply main pipe 311 are hoses; the refrigerant outlet 2011 of the evaporative heat exchanger 201 is connected to the unit water supply port 305 through the electric heating device 303, and the unit liquid replenishment and drainage port 306 is connected to the first water return branch pipe 310 through the liquid replenishment and drainage pipe 312; the unit water return port 304, the unit water supply port 305 and the unit liquid replenishment and drainage port 306 extend out of the right side of the front face sheet metal part 101; the unit water return port 304 and the unit water supply port 305 are CQC quick connectors, and the unit liquid replenishment and drainage port 306 is an SAE quick connector; the circulating water pump 301 and the electric heating device 303 are connected to the positioning sheet metal set at the corresponding position in the unit casing 1 by bolts, and the expansion liquid replenishment device 302 passes through the reserved hole of the bottom mounting base through the throat clamp to fix the expansion tank;

[0039] The electric control box 5 is fixedly installed in the front left area of the inner cavity of the unit housing 1. A window is provided on the left side of the front panel sheet metal part 101, and the front panel of the electric control box 5 is exposed through the window to show the electrical interface. The electrical interface includes a main power supply interface, a communication interface, and a debugging interface. All the control devices of the chiller are integrated in the electric control box. The electric control box precisely controls the refrigeration system, the secondary refrigerant system, and the fan of the chiller by collecting and reading the data of various temperature and pressure sensors arranged on the pipeline.

[0040] The working principle and process of this embodiment are as follows:

[0041] The refrigerant circulates in the refrigeration system 2 and undergoes a phase change in the evaporation heat exchanger 201 to provide refrigeration capacity for the whole machine. The specific process is as follows:

[0042] The refrigerant passing through the evaporation heat exchanger 201 exchanges heat with the secondary refrigerant and then evaporates to form a low-temperature and low-pressure gaseous refrigerant. The low-temperature and low-pressure gaseous refrigerant enters the compressor 202. The compressor 202 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant by doing work. The high-temperature and high-pressure gaseous refrigerant exchanges heat with air in the condensation heat exchanger 203. At the same time, after passing through the subcooling section at the end of the condensation heat exchanger 203, the temperature and pressure decrease, and the refrigerant changes from gaseous to liquid. At this time, the liquid refrigerant passes through the throttling device 204 and its temperature and pressure drop suddenly to become a low-temperature and low-pressure liquid refrigerant, and finally enters the evaporation heat exchanger 201 again to complete the refrigeration system cycle.

[0043] The fan sucks the air outside the unit from the air inlet, passes through the condensation heat exchanger 203, and discharges it from the air outlet to form a cycle.

[0044] The secondary refrigerant with a higher temperature after exchanging heat with the battery pack in the energy storage container is divided into two branches after passing through the unit return water port 304 and the secondary refrigerant system pipeline. One branch is connected to the inlet of the circulation water pump 301. Through the work of the circulation water pump 301, the secondary refrigerant is pumped into the evaporation heat exchanger 201. The other branch is connected to the expansion and replenishment device 302 through a pipeline. The secondary refrigerant exchanges heat with the low-temperature and low-pressure refrigerant in the evaporation heat exchanger 201, and its temperature decreases. The secondary refrigerant with a lower temperature coming out of the evaporation heat exchanger 201 reaches the unit water supply port 305 through the electric heating device 303, and the secondary refrigerant with a lower temperature is sent to the battery pack area through the engineering pipeline outside the unit to exchange heat with the battery pack and take away the heat generated during charging and discharging. At this time, the temperature of the secondary refrigerant increases, and then it reaches the unit return water port 304 through the engineering pipeline outside the unit to complete the secondary refrigerant system cycle. When the unit has a refrigeration demand, the electric heating device 303 will not be turned on.

[0045] The above embodiments of the present utility model are merely examples for explaining the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes and modifications can be made based on the above description. It is impossible to list all the implementation manners here. Any obvious changes or modifications derived from the technical solutions of the present utility model still fall within the protection scope of the present utility model.

Claims

1. A horizontal energy storage chiller, characterized in that: It comprises a unit casing (1), a refrigeration system (2), a cooling system (3), a fan (4), and an electric control box (5), wherein: The specific structure of the unit casing (1) is: The front face sheet metal part (101) and the rear face sheet metal part (102) are provided with hollow grid openings, respectively forming the unit air inlet and the unit air outlet; the front face sheet metal part (101) is fixedly connected to L-shaped fixed sheet metal parts (103) on the left and right sides; the fixed sheet metal part (103) is provided with a positioning installation hole (103a) on the front panel; and the side sheet metal parts (104) on the left and right sides are connected to the frame of the unit casing (1) by bolts; The fan (4) is fixedly installed in the rear area of ​​the inner cavity of the unit housing (1) and close to the air outlet of the unit; The refrigeration system (2) is fixedly installed in the middle area of ​​the inner cavity of the unit shell (1), and comprises an evaporative heat exchanger (201), a compressor (202), a condensing heat exchanger (203), and a throttling device (204). Its specific structure is as follows: The condensing heat exchanger (203) is arranged horizontally near the fan (4) and parallel to the rear end face sheet metal part (102); the compressor (202) is located in front of the condensing heat exchanger (203) and arranged horizontally; the evaporating heat exchanger (201) is also located in front of the condensing heat exchanger (203) and on the right side of the compressor (202); the refrigerant outlet of the evaporating heat exchanger (201) is connected to the refrigerant inlet of the compressor (202) through a first connecting pipe (205); the refrigerant outlet of the compressor (202) is connected to the refrigerant inlet of the condensing heat exchanger (203) through a second connecting pipe (206); the refrigerant outlet of the condensing heat exchanger (203) is connected to the refrigerant inlet of the evaporating heat exchanger (201) through a third connecting pipe (207), a throttling device (204) and a fourth connecting pipe (208) in sequence; The cooling system (3) is fixedly installed in the front right area of ​​the inner cavity of the unit housing (1), and includes a circulating water pump (301), an expansion and liquid replenishing device (302), and an electric heating device (303). Its specific structure is as follows: The electric heating device (303) is located in front of the evaporative heat exchanger (201) and directly opposite to the refrigerant outlet (2011) at the lower part of the side wall of the evaporative heat exchanger (201); the expansion and liquid replenishment device (302) is located on the left side of the electric heating device (303); and the circulating water pump (301) is located above the left side of the expansion and liquid replenishment device (302); the unit return water port (304) is connected to the first port of the tee (308) through the return water main pipe (307); the second port of the tee (308) is connected to the expansion and liquid replenishment device (302) through the second return water branch pipe (309); the third port of the tee (308) is connected to the expansion and liquid replenishment device (302) through the first return water branch pipe (31 0) is connected to the water inlet of the circulating water pump (301), the water outlet of the circulating water pump (301) is connected to the refrigerant inlet (2012) at the upper part of the side wall of the evaporative heat exchanger (201) through the water supply main pipe (311), the refrigerant outlet (2011) of the evaporative heat exchanger (201) is connected to the unit water supply port (305) through the electric heating device (303), and the unit liquid replenishment and discharge port (306) is connected to the first water return branch pipe (310) through the liquid replenishment and discharge pipe (312); the unit water return port (304), the unit water supply port (305) and the unit liquid replenishment and discharge port (306) extend out of the right side of the front face sheet metal part (101); The electric control box (5) is fixedly mounted in the front left area of ​​the inner cavity of the unit casing (1), and a window is provided on the left side of the front face sheet metal part (101), through which the front panel of the electric control box (5) exposes an electrical interface.

2. A horizontal energy storage chiller according to claim 1, characterized in that: A hollow grid opening is also provided in the rear area of ​​the top sheet metal part (105) of the unit casing (1).

3. A horizontal energy storage chiller according to claim 1, characterized in that: A pull ring (106) is also fixedly mounted on the front panel of the fixed sheet metal part (103).

4. A horizontal energy storage chiller according to claim 1, characterized in that: The surface of the evaporative heat exchanger (201) is also covered with thermal insulation cotton.

5. A horizontal energy storage chiller according to claim 1, characterized in that: The evaporative heat exchanger (201) is a plate heat exchanger or a shell and tube heat exchanger.

6. A horizontal energy storage chiller according to claim 1, characterized in that: A sealing strip is also attached to the top of the condensing heat exchanger (203).

7. A horizontal energy storage chiller according to claim 1, characterized in that: The condensing heat exchanger (203) is of copper fin type or microchannel type.

8. A horizontal energy storage chiller according to claim 1, characterized in that: The throttling device (204) is an electronic expansion valve or a thermal expansion valve.

9. A horizontal energy storage chiller according to claim 1, characterized in that: The first water return branch pipe (310) and the water supply main pipe (311) are flexible pipes.

10. A horizontal energy storage chiller according to claim 1, characterized in that: The unit water return port (304) and the unit water supply port (305) are NW quick connectors or CQC quick connectors, and the unit liquid replenishment and discharge port (306) is a SAE quick connector.

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