General type building inner area weak current well heat exchange cooling air conditioning system

Abstract

The utility model discloses a general building inner area weak current well heat exchange cooling air conditioning system, which comprises a weak current well in which a weak current cabinet is arranged, and is characterized in that a cooling fan is arranged in the weak current cabinet; the evaporator is arranged beside the weak current cabinet, the condenser is arranged in a suspended ceiling of a building space outside the weak current well, an evaporator coil pipe is arranged in the evaporator, a condenser coil pipe is arranged in the condenser, an outlet of the evaporator coil pipe is connected with an inlet of the condenser coil pipe through an ascending pipeline, and an outlet of the condenser coil pipe is connected with an outlet of the weak current well. An outlet of the condenser coil pipe is connected with an inlet of the evaporator coil pipe through a descending pipeline, and the evaporator, the condenser, the ascending pipeline and the descending pipeline are filled with refrigerant working media. And the evaporator absorbs heat generated by the weak-current cabinet, and the heat is brought to the condenser through a refrigerant under the action of the variable-frequency circulating pump and is blown into the inner corridor by the cooling fan.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning engineering and is applicable to heat exchange and cooling in the low-voltage wells of building interiors, particularly to a heat exchange and cooling method for low-voltage wells in building interiors without a centralized air conditioning system. Background Technology

[0002] With increasing informatization, the number and complexity of equipment in low-voltage electrical shafts are growing, leading to greater heat generation. Actual measurements in a hospital building during summer showed that the temperature of low-voltage equipment in one shaft reached as high as 70°C. Excessive temperature not only affects equipment performance but also poses a significant fire hazard, especially given recent incidents of fires caused by overheating equipment in hospital low-voltage electrical shafts during summer. However, due to building fire safety regulations, air conditioning ventilation and heat exchange ducts cannot be designed into low-voltage electrical shafts. Furthermore, for low-voltage electrical shafts located within buildings, their distance from the outside makes it inconvenient to install split-type air conditioners for cooling. Therefore, cooling low-voltage electrical shafts has always been a major challenge in the design, construction, and subsequent operation of buildings. Utility Model Content

[0003] The purpose of this utility model is to provide an air conditioning system that can be universally applied to heat exchange and cooling in the weak current wells of building interiors.

[0004] This utility model is achieved through the following technical solution: a general-purpose building interior low-voltage electrical shaft heat exchange and cooling air conditioning system, including a low-voltage electrical shaft, in which a low-voltage electrical cabinet is installed. The system is characterized by: a cooling fan inside the low-voltage electrical cabinet; an evaporator located outside the cabinet; and a condenser located in the ceiling of the building space outside the low-voltage electrical shaft. The evaporator contains an evaporator coil, and the condenser contains a condenser coil. The outlet of the evaporator coil is connected to the inlet of the condenser coil via a riser pipe, and the outlet of the condenser coil is connected to the inlet of the evaporator coil via a fallr pipe. Refrigerant is contained within the evaporator, condenser, riser pipe, and fallr pipe. With this configuration, the refrigerant in the evaporator coil cools the hot air blown out by the cooling fan inside the low-voltage electrical cabinet. After absorbing heat, the refrigerant releases gas, which enters the condenser coil through the riser pipe. After cooling in the condenser coil, the refrigerant absorbs the released liquid and returns to the evaporator through the fallr pipe. This process is repeated to continuously absorb the heat generated by the low-voltage electrical cabinet, ensuring the normal operation of the equipment inside the low-voltage electrical well and eliminating safety hazards caused by excessive temperature in the low-voltage electrical well.

[0005] To further accelerate heat dissipation efficiency, a condenser cooling fan is installed on the upper part of the condenser, and a condenser cooling cloth bag is installed on the lower part of the condenser. The condenser cooling cloth bag is connected to the building space through the ceiling.

[0006] To further reduce system pressure fluctuations, the downcomer includes a horizontal pipe A connected to the condenser and a vertical pipe A connected to the evaporator. The horizontal pipe A is connected to the vertical pipe A, and a liquid storage buffer tank is provided on the horizontal pipe A.

[0007] Preferably, one side of the liquid storage buffer tank is connected to the condenser via a first transverse pipe, and the other side of the liquid storage buffer tank is connected to the longitudinal pipe via a second transverse pipe. The interface between the first transverse pipe and the liquid storage buffer tank is lower than the interface between the second transverse pipe and the liquid storage buffer tank.

[0008] To further adjust the circulation of the refrigerant in the pipeline, a variable frequency circulating pump is installed on the longitudinal pipeline A, and a level gauge or float valve is installed in the liquid storage buffer tank, which is linked to the variable frequency circulating pump.

[0009] To further filter impurities in the refrigerant, a Y-type filter is installed between the variable frequency circulating pump and the liquid storage buffer tank.

[0010] To further improve the safety performance of the system, a pressure gauge and a safety valve are installed on the top of the liquid storage buffer tank.

[0011] To further facilitate equipment inspection, maintenance, and replacement, a variable frequency circulation pump front valve is installed at the front end of the variable frequency circulation pump, and a variable frequency circulation pump rear valve is installed at the rear end of the variable frequency circulation pump; an evaporator outlet valve and an evaporator inlet valve are respectively installed on the rising pipe and the falling pipe near the evaporator, and a condenser inlet valve and a condenser outlet valve are respectively installed on the rising pipe and the falling pipe near the condenser; a liquid storage buffer tank outlet valve is installed at the outlet of the liquid storage buffer tank, and the Y-type filter is located between the liquid storage buffer tank outlet valve and the variable frequency circulation pump front valve.

[0012] To further facilitate equipment inspection, maintenance, and replacement, a drain pipe is provided at the lower end of the evaporator. The end of the longitudinal pipe A is connected to the drain pipe. An evaporator inlet valve is provided on the drain pipe located between the evaporator and the longitudinal pipe A, and a drain valve is provided between the outlet of the longitudinal pipe A and the drain pipe.

[0013] Preferably, the evaporator, condenser, liquid receiver, riser pipe, and fallr pipe contain refrigerant, and ammonia is recommended as the working fluid. Beneficial effects

[0014] 1. The air conditioning system of this utility model can solve the heat exchange and cooling problem of various low-voltage electrical wells, especially low-voltage electrical wells in the interior of buildings. It can not only effectively avoid the fire hazard caused by excessive temperature of low-voltage electrical wells in summer, but also ensure the efficient operation of low-voltage electrical equipment due to timely heat exchange and cooling.

[0015] 2. This utility model utilizes a condenser installed at the top of the building space outside the low-voltage electrical shaft to form a circulation system with an evaporator installed inside the shaft. The condenser and evaporator are connected by pipes, and liquid storage buffer tanks and various valves are installed on the pipes. A fan is installed at the top of the building space to cool the condenser. In this way, the heat generated by the low-voltage electrical cabinets inside the shaft can be exchanged with the cold air outside the shaft. This allows for the addition and renovation of existing low-voltage electrical shaft air conditioning systems that lack heat exchange and cooling systems in building areas, and can also guide the design of heat exchange and cooling systems for low-voltage electrical shafts in new buildings.

[0016] 3. The liquid storage buffer tank in the air conditioning system of this utility model can not only reduce the system pressure fluctuations caused by refrigerant absorption and evaporation, but also be used for refrigerant compensation and adjustment. Under the linkage control of the variable frequency circulating pump and the liquid level gauge or float valve in the liquid storage buffer tank, it can not only ensure that the evaporator is always filled with refrigerant solution and in a circulating working state, so as to ensure the heat absorption effect of the evaporator and the heat dissipation effect of the condenser, but also avoid the variable frequency circulating pump running dry, which would cause the pump body to overheat and burn.

[0017] 4. The air conditioning system of this utility model is a non-refrigeration cold source air conditioning system, which has good energy efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a general-purpose building interior weak current well heat exchange and cooling air conditioning system in the embodiment.

[0019] Labeling Explanation: Main low-voltage cable tray 1, low-voltage shaft 2, rising pipe 3, falling pipe 4, low-voltage cabinet 5, evaporator outlet valve 6, cooling fan 7, evaporator coil 8, evaporator 9, evaporator inlet valve 10, drain valve 11, drain pipe 12, low-voltage shaft entrance / exit door 13, rear valve 14, variable frequency circulating pump 15, front valve 16, first horizontal pipe 17, condenser outlet valve 18, corridor 19, room 20, inside the ceiling of this floor 21, condenser cooling bag 22, condenser coil 23, condenser 24, condenser cooling fan 25, condenser inlet valve 26, liquid storage buffer tank 27, safety valve 28, pressure gauge 29, second horizontal pipe 30, branch cable tray 31, liquid storage buffer tank outlet valve 32, Y-type filter 33. Detailed Implementation

[0020] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. However, this utility model is not limited to these embodiments. Any improvements or substitutions based on the basic spirit of these embodiments shall still fall within the scope of protection claimed by the claims of this utility model.

[0021] Example: Figure 1 As shown, this embodiment provides a general-purpose building interior weak current well heat exchange and cooling air conditioning system, especially a building interior weak current well heat exchange and cooling system applicable to buildings without centralized air conditioning systems. It includes a weak current well, and the building space outside the weak current well is a corridor 19. The corridor is located between the weak current well 2 and the room 20, and the top of the corridor is the ceiling structure of this floor. The interior space of the ceiling and the weak current well are separated by a fireproof partition wall. The corridor is provided with a weak current well entrance door 13 facing the weak current well.

[0022] A low-voltage electrical cabinet 5 is installed inside the low-voltage electrical shaft. A main low-voltage electrical cable tray 1 extends upwards from the top of the cabinet, and a horizontal branch cable tray 31 is installed at the top of the main cable tray. The main cable tray 1 facilitates the laying of communication cables to the low-voltage electrical shaft on different floors, while the branch cable tray 31 leads to the ceiling 21 of this floor and is used for laying communication low-voltage cables on this floor. The low-voltage electrical cabinet 5 is equipped with a cooling fan 7. Since the switches and other equipment operating inside the cabinet are heat sources, the integrated fan or a separately installed independent fan enhances air circulation within the cabinet, achieving convective heat exchange and cooling of the equipment.

[0023] The general-purpose building interior low-voltage electrical shaft heat exchange and cooling air conditioning system of this embodiment also includes an evaporator 9 installed next to the low-voltage electrical cabinet and a condenser 24 installed in the ceiling of the same floor in the corridor. The evaporator contains an evaporator coil 8, and the condenser contains a condenser coil 23. The outlet of the evaporator coil is connected to the inlet of the condenser coil via a riser pipe 3, and the outlet of the condenser coil is connected to the inlet of the evaporator coil via a fallr pipe 4.

[0024] In this embodiment, a condenser cooling fan 25 is installed above the condenser, and a condenser cooling cloth bag 22 is installed below the condenser. The condenser cooling cloth bag is connected to the building space, i.e., the corridor, through the ceiling. Typically, the air inlet of the cooling fan bag is connected to the air inlet of the ceiling. The air ducts before and after the condenser cooling fan should be set according to the "Technical Specification for Ventilation Ducts," and the distance between the air inlet of the cooling fan and the air outlet of the condenser should be no less than 2 meters to prevent heat from the outlet from directly returning to the condenser through the fan inlet, thus affecting the heat exchange efficiency.

[0025] Furthermore, refrigerant is installed in the evaporator, condenser, liquid storage tank, and their piping system. The refrigerant absorbs the hot air blown out by the cooling fan in the heat exchange cabinet, and then precipitates gas. The refrigerant enters the condenser coil through the rising pipe. The condenser cooling fan blows cold air from the corridor to the condenser, where it exchanges heat with the refrigerant in the condenser coil. After being cooled in the condenser coil, the refrigerant absorbs the precipitated gas and returns to the evaporator coil through the falling pipe. In this embodiment, ammonia water is recommended as the working fluid. The solubility of ammonia water in water is negatively correlated with temperature. That is, after the ammonia water solution absorbs the heat dissipated by the heat exchange cabinet in the evaporator coil, the solubility of ammonia water in water decreases, and ammonia gas is precipitated. Conversely, after the precipitated ammonia gas is cooled by heat exchange in the condenser coil, the solubility of ammonia gas in water increases, and it is absorbed by the water, returning to the evaporator coil as ammonia water, and so on.

[0026] In this embodiment, since the evaporator is located next to the low-voltage motor, which is equivalent to the floor level, and the condenser is located inside the ceiling, both the rising pipe section and the falling pipe section include vertical and horizontal sections. Specifically, the falling pipe section includes a horizontal pipe A connected to the condenser coil outlet and a vertical pipe A connected to the evaporator coil inlet, with the other ends of the horizontal pipe A and the vertical pipe A connected together. The rising pipe section includes a horizontal pipe B connected to the condenser coil inlet and a vertical pipe B connected to the evaporator coil outlet, with the other ends of the horizontal pipe B connected together.

[0027] Furthermore, a liquid storage buffer tank 27 is installed on the horizontal pipe A of the descending pipe. One side of the liquid storage buffer tank is connected to the outlet of the condenser coil through a first horizontal pipe 17, and the other side of the liquid storage buffer tank is connected to the vertical pipe A through a second horizontal pipe 30. The interface between the first horizontal pipe and the liquid storage buffer tank is lower than the interface between the second horizontal pipe and the liquid storage buffer tank. After ammonia gas is cooled in the condenser coil, its solubility increases. It is absorbed by the liquid in the liquid storage buffer tank through the first horizontal pipe, becoming ammonia water, and then further flows back to the evaporator coil through the second horizontal pipe and the vertical pipe A.

[0028] In one embodiment, the liquid storage buffer tank 27 is equipped with a level gauge or a float valve, and a variable frequency circulating pump 15 is installed on the longitudinal pipe A. The variable frequency circulating pump returns the liquid from the liquid storage buffer tank to the evaporator coil. The level gauge or float valve is linked to the variable frequency circulating pump. When the liquid level in the liquid storage buffer tank is high, the speed of the variable frequency circulating pump is increased to increase the ammonia circulation flow rate; conversely, when the liquid level in the liquid storage buffer tank is low, the speed of the variable frequency circulating pump is decreased to reduce the ammonia circulation flow rate. However, it is necessary to ensure that the liquid level in the liquid storage buffer tank is always higher than that in the second transverse pipe to prevent the variable frequency circulating pump from running dry and damaging the equipment. In this embodiment, the variable frequency circulating pump can be a centrifugal pump with good noise reduction. Using a centrifugal pump allows the refrigerant to continue circulating naturally in the piping system even after the pump stops running. Since the ammonia release and absorption process affects system pressure changes, the buffer tank in this embodiment can not only reduce system pressure changes but also be used for refrigerant replenishment and adjustment. Furthermore, under the coordinated control of the variable frequency circulating pump and the level gauge or float valve in the buffer tank, it ensures that the evaporator is always filled with ammonia solution and in a circulating state, thus ensuring the evaporator's heat absorption effect. Moreover, as one implementation of this embodiment, a pressure gauge 29 and a safety valve 28 can also be installed on the top of the buffer tank. The pressure gauge continuously monitors the system pressure, and the safety valve releases high pressure from the system.

[0029] As one implementation method in this embodiment, valves are provided on both the front and rear pipes of the variable frequency circulating pump, namely the front valve 16 and the rear valve 14. The design of the front and rear valves facilitates the replacement, maintenance and disassembly of the variable frequency circulating pump.

[0030] An evaporator outlet valve 6 and an evaporator inlet valve 10 are respectively installed near the evaporator on the evaporator outlet pipe (longitudinal pipe B) and the evaporator inlet pipe (longitudinal pipe A). The design of these evaporator inlet and outlet valves facilitates the closure of the rising and falling pipes during evaporator inspection, maintenance, and disassembly, preventing refrigerant leakage. Furthermore, the evaporator consists of heat exchange fins and evaporator coils. When the heat exchange fins become clogged, they must be disassembled, moved to a suitable location for cleaning and drying, and then reinstalled.

[0031] A condenser outlet valve 18 and a condenser inlet valve 26 are respectively installed near the condenser on the condenser outlet pipe (i.e., the first horizontal pipe) and the condenser inlet pipe (i.e., horizontal pipe B). The design of these condenser inlet and outlet valves facilitates the closure of the pipes during condenser inspection, maintenance, and disassembly, preventing refrigerant leakage. In this embodiment, as one implementation, a drip tray is provided at the bottom of the condenser for cleaning the condenser's cooling fins after they become clogged, avoiding direct disassembly of the condenser for cleaning.

[0032] In one embodiment of this invention, a Y-type filter 33 is installed between the liquid storage buffer tank and the variable frequency circulating pump. This Y-type filter filters impurities in the refrigerant working fluid within the circulating system. Furthermore, a liquid storage buffer tank outlet valve 32 is also installed between the Y-type filter and the liquid storage buffer tank. The Y-type filter is located between the liquid storage buffer tank outlet valve and the front valve of the variable frequency circulating pump, allowing for cleaning, disassembly, maintenance, and replacement of the Y-type filter by closing both valves.

[0033] In one embodiment of this invention, a drain pipe 12 is provided at the lower end of the evaporator. The end of the longitudinal pipe A communicates with the middle of the drain pipe, and the evaporator inlet valve is located on the drain pipe between the evaporator and the longitudinal pipe A. A drain valve 11 is provided on the drain pipe between the outlet of the drain pipe and the longitudinal pipe A. The drain pipe can discharge refrigerant during maintenance and can also be used to replenish refrigerant. When injecting the refrigerant, the safety valve on the liquid storage buffer tank can be opened as an exhaust port.

[0034] In addition, as an option in this embodiment, the entrance door to the low-voltage electrical shaft should be a fireproof door, and a fireproof airtight door is recommended; the main low-voltage cable tray, branch cable trays, and all through-wall pipes should be fireproofed. Pipes in the circulation system should be insulated according to specifications, and stainless steel is recommended for all types of pipes, valves, buffer tanks, and variable frequency circulating pumps in the air conditioning system to prevent refrigerant leakage due to corrosion of iron / cast iron materials. Because a heat exchange fan is installed at the low-voltage electrical cabinet, the air circulation convection is relatively strong; therefore, it is recommended to implement dustproof design for the low-voltage electrical shaft, such as laying wall and floor tiles, to avoid excessive dust generation caused by the current unfinished room structure of the low-voltage electrical shaft, which could affect the heat dissipation effect of the low-voltage equipment.

Claims

1. A general-purpose building inner area weak current shaft heat exchange cooling air conditioning system, comprising a weak current shaft, a weak current cabinet is installed in the weak current shaft, characterized in that: The weak current cabinet is provided with a heat dissipation fan, and further comprises an evaporator arranged outside the weak current cabinet and a condenser arranged in a ceiling of a building space outside the weak current well, the evaporator is provided with an evaporator coil, the condenser is provided with a condenser coil, an outlet of the evaporator coil is connected to an inlet of the condenser coil through a rising pipe, an outlet of the condenser coil is connected to an inlet of the evaporator coil through a falling pipe, and the evaporator, the condenser, the rising pipe and the falling pipe are filled with a refrigerant working medium. ​ 2. The universal building inner zone weak current shaft heat exchange cooling air conditioning system according to claim 1, characterized in that: The condenser is further provided with a condenser heat dissipation fan at an upper portion thereof, and is provided with a condenser heat dissipation cloth bag at a lower portion thereof, the condenser heat dissipation cloth bag is communicated with the building space through the ceiling.

3. The universal building inner zone weak current shaft heat-recovery cooling air conditioning system according to claim 1 or 2, characterized in that: The falling pipe comprises a transverse pipe A connected to the condenser and a longitudinal pipe A connected to the evaporator, the transverse pipe A is communicated with the longitudinal pipe A, and a liquid storage buffer tank is arranged on the transverse pipe A.

4. The universal building inner zone weak current shaft heat-recovery cooling air conditioning system according to claim 3, characterized in that: One side of the liquid storage buffer tank is connected to the condenser through a first transverse pipe, the other side of the liquid storage buffer tank is connected to the longitudinal pipe through a second transverse pipe, and an interface between the first transverse pipe and the liquid storage buffer tank is lower than an interface between the second transverse pipe and the liquid storage buffer tank.

5. The universal building inner zone low-voltage shaft heat-recovery cooling air conditioning system according to claim 4, characterized in that: A variable frequency circulating pump is arranged on the longitudinal pipe A, and a liquid level meter or a floating ball valve is arranged in the liquid storage buffer tank, the liquid level meter or the floating ball valve is linked to the variable frequency circulating pump.

6. The universal building inner zone weak current shaft heat-recovery cooling air conditioning system according to claim 5, characterized in that: A Y-shaped filter is arranged between the variable frequency circulating pump and the liquid storage buffer tank.

7. The universal building inner zone weak current shaft heat-recovery cooling air conditioning system according to claim 6, characterized in that: A pressure gauge and a safety valve are arranged on a top portion of the liquid storage buffer tank.

8. The universal building inner zone weak current shaft heat-recovery cooling air conditioning system according to claim 6 or 7, characterized in that: A front end valve of the variable frequency circulating pump is arranged at a front end of the variable frequency circulating pump, a rear end valve of the variable frequency circulating pump is arranged at a rear end of the variable frequency circulating pump, an evaporator outlet valve and an evaporator inlet valve are respectively arranged on the rising pipe and the falling pipe near the evaporator, a condenser inlet valve and a condenser outlet valve are respectively arranged on the rising pipe and the falling pipe near the condenser, and an outlet valve of the liquid storage buffer tank is arranged at an outlet of the liquid storage buffer tank, the Y-shaped filter is located between the outlet valve of the liquid storage buffer tank and the front end valve of the variable frequency circulating pump.

9. The universal building inner zone low-voltage shaft heat-recovery cooling air conditioning system of claim 8, wherein: An outlet of the falling pipe is communicated with the rising pipe, and an outlet of the rising pipe is communicated with the evaporator, the evaporator is provided with an evaporator coil, the condenser is provided with a condenser coil, an outlet of the evaporator coil is connected to an inlet of the condenser coil through a rising pipe, an outlet of the condenser coil is connected to an inlet of the evaporator coil through a falling pipe, and the evaporator, the condenser, the rising pipe and the falling pipe are filled with a refrigerant working medium.

10. The universal building inner zone low-voltage shaft heat-recovery cooling air conditioning system of claim 3, wherein: The evaporator is provided with a drain pipe at a lower end thereof, an end of the longitudinal pipe A is communicated with the drain pipe, the evaporator inlet valve is arranged on the drain pipe between the evaporator and the longitudinal pipe A, and a drain valve is arranged between the longitudinal pipe A and an outlet of the drain pipe. The evaporator, the condenser, the liquid storage tank, the rising pipe and the falling pipe are filled with a refrigerant working medium, and the refrigerant working medium is ammonia water.

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