Direct evaporation type ice storage coil pipe structure and ice storage device

Abstract

The utility model provides a direct evaporation type ice storage coil pipe structure and an ice storage device. The direct evaporation type ice storage coil pipe structure comprises an ice storage coil pipe frame, a plurality of sets of snakelike ice storage coil pipes, a supporting and fixing plate, a liquid inlet pipe, a liquid inlet pipe box, an air return pipe and an air return pipe box. An oil return pipe is arranged on the air return pipe side of the air return pipe box, a first end opening of the oil return pipe is communicated with the air return pipe, and a second end opening of the oil return pipe is communicated with the air return pipe box. A refrigerant flow path adopts an upper inlet and lower outlet mode, and the snakelike ice storage coil pipe has a certain inclination, so that lubricating oil flows to the bottom air return pipe box from top to bottom along the snakelike ice storage coil pipe, and an oil return pipe is arranged at the bottom of the air return pipe box and is connected with an air return pipe. Lubricating oil gathered at the bottom of the air return pipe box is brought back to the compressor through high-flow-speed drainage of refrigerant gas in the air return pipe.

Description

Technical Field

[0001] The utility model belongs to the technical field of refrigeration, and in particular relates to a direct evaporation type ice storage coil structure and an ice storage device. Background Art

[0002] Energy storage air conditioning technology uses the storage of cold or heat during the nighttime low electricity consumption period and releases the cold or heat during the daytime peak electricity consumption period. It can balance the load on the power grid. Users can save air conditioning operating costs by taking advantage of the difference in peak and valley electricity prices. It has been increasingly widely used in large central air conditioning systems.

[0003] The ice storage coil acts as both an energy storage container and a heat exchanger. Most existing ice storage coils circulate antifreeze (typically a 25% ethylene glycol solution). During ice-making, the dual-mode mainframe transfers the cooling energy from the refrigerant to the ethylene glycol, which is then pumped through the ethylene glycol pump to the ice storage coils. During ice-melting cooling, the ethylene glycol pump pumps the cooling energy out of the ice storage coils and transfers it to chilled water via a plate heat exchanger.

[0004] At present, there are also a small number of ice storage coils whose medium is refrigerant. When making ice, the refrigerant evaporates in the ice storage coil and absorbs heat, and the water outside the ice storage coil freezes; when melting ice to provide cooling, the water in the insulated water tank where the ice storage coil is located circulates with the air-conditioning terminal to take away the cooling energy.

[0005] Compared with traditional ethylene glycol system ice storage coils, direct evaporation ice storage coils are more efficient, but there are two problems that most equipment manufacturers have not solved: one is the oil return problem, and the other is the problem of uniform refrigerant distribution.

[0006] Refrigerant in the compressor requires lubrication, so a certain proportion of lubricating oil is usually mixed with the refrigerant and circulates with it. The large volume and long length of the ice storage coil pipes can easily lead to lubricating oil accumulating inside the coils, affecting both compressor lubrication and heat transfer.

[0007] In addition, each project has multiple ice storage coils connected in parallel, and each ice storage coil is composed of dozens of groups of heat exchange tubes connected in parallel. When the refrigerant enters the ice storage coil, it is in two phases: gas and liquid, which can easily cause uneven distribution of the refrigerant, ultimately leading to low heat exchange efficiency, uneven ice formation and other problems. Utility Model Content

[0008] The first object of the present utility model is to provide a direct evaporation type ice storage coil structure.

[0009] To this end, the above-mentioned purpose of the utility model is achieved through the following technical solutions:

[0010] A direct evaporation ice storage coil structure includes an ice storage coil frame, multiple groups of serpentine ice storage coils, a support and fixing plate, a liquid inlet pipe, a liquid inlet pipe box, an air return pipe, and an air return pipe box; the support and fixing plate is used to fix the ice storage coil frame to accommodate the multiple groups of serpentine ice storage coils; the characteristics are:

[0011] The liquid inlet pipe is connected to the liquid inlet pipe box, which is arranged above the direct evaporation ice storage coil structure and is connected to the upper end openings of the multiple groups of serpentine ice storage coils;

[0012] The return air pipe is connected to the return air pipe box, which is arranged below the direct evaporation ice storage coil structure and is connected to the lower end openings of the multiple groups of serpentine ice storage coils;

[0013] The return air pipe box and the return air pipe side are provided with an oil return pipe, the first end opening of the oil return pipe is connected to the return air pipe, the second end opening of the oil return pipe is connected to the return air pipe box, the elevation of the second end opening of the oil return pipe is not higher than the liquid level of the lubricating oil accumulated in the return air pipe box, and the elevation of the first end opening of the oil return pipe is not lower than the elevation of the second end opening of the oil return pipe.

[0014] Direct evaporative ice storage coil: During the cold storage period, the refrigerant evaporates in the serpentine ice storage coil, causing the water in the insulated water tank to freeze and store cold; during the cooling period, the water in the insulated water tank circulates between the cooling equipment to melt the ice and cool the equipment.

[0015] While adopting the above technical solutions, the present invention may also adopt or combine the following technical solutions:

[0016] As a preferred technical solution of the present invention: a flow equalizing plate is provided in the liquid inlet pipe box, and a plurality of flow equalizing holes are provided on the flow equalizing plate; the flow equalizing plate is placed horizontally to divide the liquid inlet pipe box into two upper and lower chambers;

[0017] The liquid inlet pipe is communicated with the upper chamber of the liquid inlet pipe box, and the upper end openings of the plurality of groups of serpentine ice storage coils are communicated with the lower chamber of the liquid inlet pipe box.

[0018] As an optimal technical solution of the present invention: multiple rows of air blowing pipes are provided at the bottom of the direct evaporation ice storage coil structure, and each air blowing pipe is provided with at least one row of air blowing holes. By blowing air from the air blowing holes, the ice melting rate in the insulated water tank can be increased and the uniformity of ice melting can be improved.

[0019] As an optimal technical solution of the present invention: the middle part of the multiple groups of serpentine ice storage coils has an inclination from top to bottom along the flow direction of the refrigerant liquid, so that the lubricating oil can flow from top to bottom into the return air pipe box by its own gravity.

[0020] As a preferred technical solution of the present invention, the ice storage coils where the liquid inlets of the multiple groups of serpentine ice storage coils are located are flush, that is, the connection (liquid inlet) between the ice storage coils where the liquid inlets of the multiple groups of serpentine ice storage coils are located and the liquid inlet pipe box, utilizes the toughness of the serpentine ice storage coils themselves to level the liquid inlets of all the serpentine ice storage coils on the same horizontal plane.

[0021] As an optimal technical solution of the present invention: the inclination angle is 0-10°.

[0022] As a preferred technical solution of the present invention, the serpentine ice storage coils in the plurality of groups are arranged in a staggered pattern.

[0023] Another object of the present invention is to provide a direct evaporation ice storage device.

[0024] To this end, the above-mentioned purpose of the utility model is achieved through the following technical solutions:

[0025] A direct evaporation ice storage device includes an insulated water tank, and is characterized in that it also includes the direct evaporation ice storage coil structure as described above, and the direct evaporation ice storage coil structure is arranged in the insulated water tank.

[0026] Due to the low density of gas and the high density of liquid, the refrigerant circulation in the evaporator (a direct evaporation ice storage device is actually the evaporator of the refrigeration system during ice making) usually adopts a bottom-in, top-out refrigerant circulation method. In this utility model, the refrigerant flow adopts a top-in, bottom-out refrigerant flow method, and the serpentine ice storage coil has a certain inclination, allowing the lubricating oil to flow from top to bottom along the serpentine ice storage coil to the bottom return air box. A return oil pipe is installed at the bottom of the return air box to connect to the return air pipe. The high flow rate of the refrigerant gas in the return air pipe is used to divert the lubricating oil accumulated at the bottom of the return air box back to the compressor.

[0027] In addition, due to the large size of the ice storage coil, it is inconvenient to use the traditional refrigerant liquid distributor head for processing. The liquid inlet pipe box is divided into two upper and lower chambers. The liquid inlet pipe is connected to the upper chamber, and multiple groups of serpentine ice storage coils are connected to the lower chamber. The partition plate (also known as the flow equalizing plate) between the upper and lower chambers adopts a porous form (with multiple flow equalizing holes) to play a flow equalizing role.

[0028] Compared with the in-line arrangement, the forked arrangement saves more space, but the inlet and outlet of the forked coil are not on the same horizontal plane in the pipe box, especially in the liquid inlet pipe box, where the refrigerant is in a gas-liquid two-phase state. The inlet and outlet of the coil are not on the same horizontal plane, which will lead to serious uneven distribution of the refrigerant. The utility model not only utilizes the forked arrangement to save space, but also utilizes the toughness of the pipe to make the inlet of the coil on the same horizontal plane in the liquid inlet pipe box, thereby ensuring uniform distribution of the refrigerant flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural diagram of the direct evaporation ice storage coil structure provided by the utility model.

[0030] Figure 2 This is a cross-sectional diagram of the ice storage coils in the prior art arranged in a row.

[0031] Figure 3 This is a cross-sectional view of the ice storage coils in the prior art arranged in a staggered row.

[0032] Figure 4 This is a cross-sectional view of the ice storage coils provided by the present invention in a staggered arrangement. DETAILED DESCRIPTION

[0033] The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

[0034] A direct evaporation type ice storage device comprises a heat preservation water tank and a direct evaporation type ice storage coil structure. The direct evaporation type ice storage coil structure is arranged in the heat preservation water tank.

[0035] A direct evaporation ice storage coil structure includes an ice storage coil frame 1, a support and fixing plate 2, multiple groups of serpentine ice storage coils 3, a liquid inlet pipe 4, a liquid inlet pipe box 5, an air return pipe 6, and an air return pipe box 7; the support and fixing plate 2 is used to fix the ice storage coil frame 1 to accommodate the multiple groups of serpentine ice storage coils 3;

[0036] The liquid inlet pipe 4 is connected to the liquid inlet pipe box 5, which is arranged above the direct evaporation ice storage coil structure, and the liquid inlet pipe box 5 is connected to the upper end openings of the multiple groups of serpentine ice storage coils 3;

[0037] The return air pipe 6 is connected to the return air pipe box 7, which is arranged below the direct evaporation ice storage coil structure, and the return air pipe box 7 is connected to the lower end openings of the multiple groups of serpentine ice storage coils 3;

[0038] An oil return pipe 8 is provided on the side of the return air pipe box 7 and the return air pipe 6. The first end opening of the oil return pipe 8 is connected to the return air pipe 6, and the second end opening of the oil return pipe 8 is connected to the return air pipe box 7. The elevation of the second end opening of the oil return pipe 8 is not higher than the liquid level of the lubricating oil accumulated in the return air pipe box 7, and the elevation of the first end opening of the oil return pipe 8 is not lower than the elevation of the second end opening of the oil return pipe 8.

[0039] Direct evaporative ice storage coil: During the cold storage period, the refrigerant evaporates in the serpentine ice storage coil, causing the water in the insulated water tank to freeze and store cold; during the cooling period, the water in the insulated water tank circulates between the cooling equipment to melt the ice and cool the equipment.

[0040] A flow balancing plate 51 is provided in the liquid inlet pipe box 5, and a plurality of flow balancing holes 51a are provided on the flow balancing plate 51. The flow balancing plate 51 is placed horizontally to divide the liquid inlet pipe box 5 into two upper and lower chambers.

[0041] The liquid inlet pipe 4 is communicated with the upper chamber of the liquid inlet pipe box 5 , and the upper end openings of the plurality of serpentine ice storage coils 3 are communicated with the lower chamber of the liquid inlet pipe box 5 .

[0042] The bottom of the direct evaporation ice storage coil structure is provided with multiple rows of air blowing pipes 9, and each air blowing pipe 9 is provided with at least one row of air blowing holes. By blowing air from the air blowing holes, the ice melting rate in the insulated water tank can be increased and the uniformity of ice melting can be improved.

[0043] The serpentine ice storage coils 3 are arranged in a staggered arrangement. The middle portion of the serpentine ice storage coils 3 has an inclination from top to bottom along the flow direction of the refrigerant liquid. This allows the lubricating oil to flow from top to bottom into the return air pipe box 7 under its own gravity. The inclination angle is 0 to 10 degrees.

[0044] The ice storage coils where the liquid inlets of the multiple groups of serpentine ice storage coils 3 are located are flush, that is, the connection (liquid inlet) between the ice storage coils where the liquid inlets of the multiple groups of serpentine ice storage coils 3 are located and the liquid inlet pipe box 5, utilize the toughness of the serpentine ice storage coils themselves to level the liquid inlets of all the serpentine ice storage coils on the same horizontal plane.

[0045] Specifically, during ice making, the gas-liquid two-phase refrigerant from the refrigeration system flows through the liquid inlet pipe 4, into the upper chamber of the liquid inlet manifold 5, and then through the equalizing holes 51a on the equalizing plate 51 into the lower chamber of the liquid inlet manifold 5. It then evaporates in the serpentine ice storage coils, enters the return manifold 7, and then returns to the refrigeration system through the return manifold 6. The refrigerant evaporates in the serpentine ice storage coils, absorbing heat and causing the water outside the serpentine ice storage coils in the insulated water tank to freeze and store cold. The lubricating oil that enters the serpentine ice storage coils along with the refrigerant is then collected in the return manifold 7 by the flow of the refrigerant and gravity. Based on the principle of injection, the high-speed refrigerant flow in the return manifold 6 injects the lubricating oil from the bottom of the return manifold 7 through the oil return pipe 8 into the return manifold 6, where it returns to the refrigeration system.

[0046] During ice melting, hot water from the cooling equipment enters the insulated water tank, melting the ice outside the serpentine ice storage coils. Once the water temperature drops, it is pumped through the circulating water pump to the cooling equipment, releasing the cold stored in the serpentine ice storage coils. The air blast 9, located at the bottom of the serpentine ice storage coils, creates air disturbance, increasing the melting rate and avoiding dead spots.

[0047] The above-mentioned specific implementation methods are used to explain the present invention and are only preferred embodiments of the present invention, rather than limiting the present invention. Within the spirit of the present invention and the scope of protection of the claims, any modifications, equivalent replacements, improvements, etc. made to the present invention shall fall within the scope of protection of the present invention.

Claims

1. A direct evaporative ice storage coil structure, comprising an ice storage coil frame, multiple groups of serpentine ice storage coils, a support and fixing plate, a liquid inlet pipe, a liquid inlet pipe box, an air return pipe, and an air return pipe box; the support and fixing plate is used to fix the ice storage coil frame to accommodate the multiple groups of serpentine ice storage coils; the structure is characterized by: The liquid inlet pipe is connected to the liquid inlet pipe box, which is arranged above the direct evaporation ice storage coil structure and is connected to the upper end openings of the multiple groups of serpentine ice storage coils; The return air pipe is connected to the return air pipe box, which is arranged below the direct evaporation ice storage coil structure and is connected to the lower end openings of the multiple groups of serpentine ice storage coils; The return air pipe box and the return air pipe side are provided with an oil return pipe, the first end opening of the oil return pipe is connected to the return air pipe, the second end opening of the oil return pipe is connected to the return air pipe box, the elevation of the second end opening of the oil return pipe is not higher than the liquid level of the lubricating oil accumulated in the return air pipe box, and the elevation of the first end opening of the oil return pipe is not lower than the elevation of the second end opening of the oil return pipe.

2. The direct evaporation ice storage coil structure according to claim 1, characterized in that: A flow equalizing plate is provided in the liquid inlet pipe box, and a plurality of flow equalizing holes are provided on the flow equalizing plate; the flow equalizing plate is placed horizontally to divide the liquid inlet pipe box into two upper and lower chambers; The liquid inlet pipe is communicated with the upper chamber of the liquid inlet pipe box, and the upper end openings of the plurality of groups of serpentine ice storage coils are communicated with the lower chamber of the liquid inlet pipe box.

3. The direct evaporation ice storage coil structure according to claim 1, characterized in that: The bottom of the direct evaporation ice storage coil structure is provided with multiple rows of air blowing pipes, and each air blowing pipe is provided with at least one row of air blowing holes.

4. The direct evaporation ice storage coil structure according to claim 1, characterized in that: The middle part of the plurality of groups of serpentine ice storage coils has an inclination from top to bottom along the flow direction of the refrigerant liquid.

5. The direct evaporation ice storage coil structure according to claim 4, characterized in that: The ice storage coils where the liquid inlets of the multiple groups of serpentine ice storage coils are located are flush with each other.

6. The direct evaporation ice storage coil structure according to claim 4, characterized in that: The inclination angle is 0 to 10 degrees.

7. The direct evaporation ice storage coil structure according to claim 4, characterized in that: The serpentine ice storage coils in the multiple groups are arranged in a staggered pattern.

8. A direct evaporation ice storage device, comprising an insulated water tank, characterized in that: It also includes the direct evaporation type ice storage coil structure according to any one of claims 1 to 7, wherein the direct evaporation type ice storage coil structure is arranged in an insulated water tank.

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