Efficient energy-saving device of centrifugal refrigerating unit of heating and ventilation machine room
By introducing a swirl distributor and an intelligent control system into the centrifugal chiller unit in the HVAC room, the problems of uneven refrigerant distribution and high energy consumption have been solved, achieving more efficient energy utilization and dynamic adjustment capabilities.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2026-03-24
AI Technical Summary
Traditional centrifugal chiller units for HVAC rooms suffer from problems such as uneven refrigerant distribution, low heat transfer efficiency, and high energy consumption, especially lacking dynamic adjustment capabilities under variable load conditions.
The system employs components such as a swirl distributor, flow equalization net, spiral guide vane, and flow regulating valve, combined with a controller for intelligent control, to achieve balanced and uniform refrigerant flow rate and distribution. The design of the flow guide hole counteracts eddy current disturbances, and the flow rate is adjusted in real time using sensor feedback.
It improves the heat transfer efficiency of the refrigeration unit, reduces energy consumption, enhances the regulation capability under variable load conditions, and avoids the lag problem of traditional control.
Smart Images
Figure CN224034061U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to energy -conserving device technical field, specifically is a kind of high -efficient energy -conserving device of heating and ventilation machine room centrifugal refrigerating unit. BACKGROUND
[0002] Heating and ventilation machine room is a facility specially used for controlling the temperature and humidity of machine room, ensuring the normal operation of equipment in machine room and prolonging the service life of equipment, and centrifugal refrigerating unit (or centrifugal water chiller) for air conditioning is composed of centrifugal refrigeration compressor, evaporator, condenser, main motor, suction recovery device, lubrication system, control cabinet and starting cabinet, and some of these components are assembled in a decentralized manner, but most of them are "assembled" units with components combined together, and the unit is divided into fully enclosed, semi-enclosed and open type.
[0003] Centrifugal refrigerating unit of heating and ventilation machine room is generally equipped with energy-saving device to reduce operating energy consumption, but the falling film evaporator of traditional centrifugal refrigerating unit has the problem of uneven distribution of refrigerant, which leads to low local heat transfer efficiency, excessive liquid film or dryness, and requires high-flow pump to maintain operation, which consumes more energy, and the existing distributor is mostly single-stage orifice plate structure, which cannot adapt to variable load conditions and lacks dynamic adjustment capability, therefore, we propose a high-efficiency energy-saving device for centrifugal refrigerating unit of heating and ventilation machine room. UTILITY MODEL CONTENTS
[0004] The utility model aims at solving one of the technical problems existing in prior art or related art.
[0005] To this end, the technical scheme adopted by the utility model is as follows:
[0006] A high-efficiency energy-saving device for centrifugal refrigerating unit of heating and ventilation machine room, comprising: a machine body assembly and an energy-saving assembly arranged on the machine body assembly; the machine body assembly comprises a falling film evaporator, a heat exchange tube bundle arranged inside the falling film evaporator, a liquid storage cavity arranged below the heat exchange tube bundle, a circulating pump connected to the bottom end of the falling film evaporator, a liquid supply pipeline connected to the top end of the falling film evaporator and connected to the circulating pump, a separation chamber connected to the side of the liquid storage cavity, and a vapor compressor connected between the falling film evaporator and the separation chamber; the energy-saving assembly comprises a cyclone distributor mounted on the top of the falling film evaporator and connected to the liquid supply pipeline, a flow equalizing net mounted on the bottom of the cyclone distributor, a fixed net mounted on the top of the flow equalizing net, a fixed shaft fixed between the flow equalizing net and the fixed net, a spiral guide vane fixed on the fixed shaft, a guide hole opened on the bottom of the spiral guide vane, a flow regulating valve and a pressure sensor arranged on the liquid supply pipeline, and a liquid level sensor arranged in the liquid storage cavity.
[0007] The utility model discloses in a preferable example can be further configured as: the aperture of the flow guide hole is in the refrigerant flow direction and presents the step -by -step decrease.
[0008] The utility model discloses in a preferable example can be further configured as: the interval of the flow equalizing net and the upper end surface of heat exchange tube bundle is 50-100mm.
[0009] The utility model discloses in a preferable example can be further configured as: the flow equalizing net is the corrosion -resistant honeycomb hexagonal mesh board -like structure.
[0010] The utility model discloses in a preferable example can be further configured as: the circulating pump, pressure sensor and liquid level sensor signal connection have the controller, and be used for the dynamic adjustment refrigerant flow according to real -time liquid level, pressure data.
[0011] The utility model discloses in a preferable example can be further configured as: the surface of the flow equalizing net is covered with and is the polytetrafluoroethylene oleophobic coating of thickness 10-20mu.
[0012] The above technical scheme of the utility model has following beneficial technical effects:
[0013] 1. The utility model discloses a energy -conserving subassembly, utilizes the flow equalizing net and spiral flow guide vane in cyclone distributor and cooperates the flow guide hole of step -by -step design, can realize refrigerant flow velocity step -by -step equalization, reduces liquid film fluctuation, can offset vortex disturbance simultaneously, promotes distribution uniformity to reduce the energy consumption of refrigerating unit.
[0014] 2. The utility model discloses a energy -conserving subassembly can carry out intelligent integrated control with the controller of signal connection of circulating pump, pressure sensor and liquid level sensor, integrates historical data and real -time feedback, avoids the lag problem of traditional PID control. DRAWINGS
[0015] Fig. 1 It is the sectional view of the high -efficient energy -conserving device of the utility model;
[0016] Fig. 2 It is the partial close -up view of the high -efficient energy -conserving device of the utility model.
[0017] Reference signs:
[0018] 100, machine body assembly;110, falling film evaporator;120, heat exchange tube bundle;130, liquid storage cavity;140, circulating pump;150, liquid supply pipeline;160, separation chamber;170, vapor compressor;
[0019] 200, energy saving assembly; 210, cyclone distributor; 220, flow equalizing net; 230, fixed net; 240, fixed shaft; 250, spiral guide vane; 260, guide hole; 270, flow regulating valve; 280, pressure sensor; 290, liquid level sensor. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical scheme and advantages of the utility model more clear and apparent, the utility model will be further explained in detail below in combination with specific embodiments and with reference to the drawings. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.
[0021] It is understood that the above description is only exemplary and is not intended to limit the scope of the utility model.
[0022] Some embodiments of the utility model provide a high-efficiency energy-saving device for a centrifugal refrigerating unit in a heating and ventilation machine room, which will be described below in combination with the drawings.
[0023] In combination with Figs. 1-2 As shown in the drawings, the utility model provides a high-efficiency energy-saving device for a centrifugal refrigerating unit in a heating and ventilation machine room, which comprises a machine body assembly 100 and an energy saving assembly 200 arranged on the machine body assembly 100.
[0024] The machine body assembly 100 comprises a falling film evaporator 110, a heat exchange tube bundle 120 arranged inside the falling film evaporator 110, a liquid storage cavity 130 arranged below the heat exchange tube bundle 120, a circulating pump 140 connected to the bottom end of the falling film evaporator 110, a liquid supply pipeline 150 connected to the top end of the falling film evaporator 110 and connected to the circulating pump 140, a separation chamber 160 connected to the side of the liquid storage cavity 130, and a vapor compressor 170 connected between the falling film evaporator 110 and the separation chamber 160. The energy saving assembly 200 comprises a cyclone distributor 210 mounted on the top of the falling film evaporator 110 and connected to the liquid supply pipeline 150, a flow equalizing net 220 mounted on the bottom of the cyclone distributor 210, a fixed net 230 mounted on the top of the flow equalizing net 220, a fixed shaft 240 fixed between the flow equalizing net 220 and the fixed net 230, a spiral guide vane 250 fixed on the fixed shaft 240, a guide hole 260 opened on the bottom of the spiral guide vane 250, a flow regulating valve 270 and a pressure sensor 280 arranged on the liquid supply pipeline 150, and a liquid level sensor 290 arranged in the liquid storage cavity 130. Through the energy saving assembly 200, the flow equalizing net 220 and the spiral guide vane 250 in the cyclone distributor 210 cooperate with the stepwise designed guide hole 260 to realize gradual equalization of the flow rate of the refrigerant, reduce liquid film fluctuation, offset vortex disturbance, improve distribution uniformity, and thus reduce the energy consumption of the refrigerating unit.
[0025] Further, the pore size of the flow guide hole 260 decreases in steps along the refrigerant flow direction, which can offset the vortex disturbance and improve the uniformity of distribution.
[0026] On the other hand, the spacing between the flow uniformizing net 220 and the upper end surface of the heat exchange tube bundle 120 is 50-100 mm, which can make the refrigerant more uniformly distributed into the heat exchange tube bundle 120 after flow uniformization, thereby ensuring the operation effect.
[0027] It should be noted that the flow uniformizing net 220 is a corrosion-resistant honeycomb hexagonal mesh plate structure, which can better make the downward movement of the refrigerant more uniform and the flow uniformization effect better.
[0028] Further, the circulating pump 140, the pressure sensor 280 and the liquid level sensor 290 are signal connected with a controller, which is used for dynamically adjusting the refrigerant flow according to the real-time liquid level and pressure data, and the circulating pump 140, the pressure sensor 280 and the liquid level sensor 290 and the signal connected controller can be intelligently integrated controlled, historical data and real-time feedback are integrated, and the hysteresis problem of the traditional PID control is avoided.
[0029] Further, the surface of the flow uniformizing net 220 is covered with a polytetrafluoroethylene oleophobic coating with a thickness of 10-20 μm, which can improve the passing efficiency of the coolant and prevent the hysteresis phenomenon from affecting the feeding rate.
[0030] The working principle and use process of the utility model are as follows: first, the feed liquid is input from the liquid supply pipeline 150, driven by the circulating pump 140 and then enters the cyclone distributor 210, the feed liquid is distributed into a film by the spiral flow guide vane 250 and the flow uniformizing net 220, and then is uniformly distributed into each heat exchange tube bundle 120, under the action of gravity, vacuum induction and airflow, the feed liquid flows from top to bottom in a uniform film, in the flowing process, the feed liquid is heated and vaporized by the shell side heating medium, the generated steam and liquid phase enter the separation chamber 160 of the evaporator together, the steam and liquid are fully separated, the steam enters the next effect evaporator as a heating medium, thereby realizing multi-effect operation, and the liquid phase is discharged from the separation chamber.
[0031] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, the scope of the utility model is defined by the claims and its equivalents.
Claims
1. A high-efficiency energy-saving device for a heating and air-conditioning plant centrifugal refrigeration unit, characterized in that, The utility model relates to a refrigeration system, including: a machine body assembly (100) and an energy-saving assembly (200) arranged on the machine body assembly (100). The machine body assembly (100) includes a falling film evaporator (110), a heat exchange tube bundle (120) arranged inside the falling film evaporator (110), a liquid storage cavity (130) arranged below the heat exchange tube bundle (120), a circulating pump (140) connected to the bottom end of the falling film evaporator (110), a liquid supply pipeline (150) connected to the top end of the falling film evaporator (110) and connected to the circulating pump (140), a separation chamber (160) connected to the side of the liquid storage cavity (130), and a steam compressor (170) connected between the falling film evaporator (110) and the separation chamber (160). The energy-saving assembly (200) includes a cyclone distributor (210) mounted on the top of the falling film evaporator (110) and connected to the liquid supply pipeline (150), a uniform flow net (220) mounted on the bottom of the cyclone distributor (210), a fixed net (230) mounted on the top of the uniform flow net (220), a fixed shaft (240) fixed between the uniform flow net (220) and the fixed net (230), a spiral flow guide vane (250) fixed on the fixed shaft (240), a flow guide hole (260) opened in the bottom of the spiral flow guide vane (250), a flow regulating valve (270) and a pressure sensor (280) arranged on the liquid supply pipeline (150), and a liquid level sensor (290) arranged in the liquid storage cavity (130).
2. The energy-efficient device for a heating and ventilation room centrifugal refrigeration unit according to claim 1, characterized in that, The hole diameter of the flow guide hole (260) decreases in steps along the flow direction of the refrigerant.
3. The energy-efficient device for a heating and ventilation room centrifugal refrigeration unit according to claim 1, characterized in that, The distance between the uniform flow net (220) and the upper end surface of the heat exchange tube bundle (120) is 50-100 mm.
4. The energy saving device for a high-efficiency centrifugal refrigeration unit of a heating and ventilation machine room according to claim 3, characterized in that, The uniform flow net (220) is a honeycomb-shaped hexagonal grid plate structure with corrosion resistance.
5. The energy efficient device for a heating and ventilation centrifugal refrigeration unit in a machine room according to claim 1, characterized in that, The circulating pump (140), the pressure sensor (280), and the liquid level sensor (290) are signal-connected with a controller for dynamically adjusting the refrigerant flow according to real-time liquid level and pressure data.
6. The energy efficient device for a heating and ventilation centrifugal refrigeration unit in a machine room according to claim 1, characterized in that, The surface of the uniform flow net (220) is covered with a polytetrafluoroethylene oleophobic coating with a thickness of 10-20 μm.