Energy-saving efficient heat exchanger of screw type condensing unit

Abstract

The energy-saving efficient heat exchanger comprises a heat exchange mechanism connected with the screw type condensing unit, a heat preservation mechanism used for heat preservation and energy storage is arranged on the surface of the heat exchange mechanism, and a supporting mechanism used for supporting is arranged on the heat preservation mechanism; the heat preservation mechanism comprises two heat preservation shells which are symmetrically arranged, a cavity used for containing the heat preservation mechanism is formed between the two heat preservation shells, and the two heat preservation shells are fixedly connected through a supporting mechanism. The combined design of the spiral heat exchange pipes and the staggered inclined baffle plates is adopted for the heat exchange mechanism, the contact area and the contact duration of cold and hot fluid can be increased, the fluid flowing path can be optimized, the flow is evenly distributed, and the heat transfer efficiency is improved; meanwhile, the heat preservation layer of the heat preservation mechanism and the phase change energy storage layer work together, heat loss in the heat exchange process is reduced, extra energy consumption of the unit is reduced, and the dual purposes of energy conservation and high efficiency are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange equipment, more specifically to the technical field of screw condensing units, and particularly relates to an energy-saving and efficient heat exchanger of a screw condensing unit. BACKGROUND

[0002] A heat exchanger, also known as a heat exchanger or heat exchange equipment, is a device used to transfer heat from hot fluid to cold fluid to meet specified process requirements, and is an industrial application of convective heat transfer and thermal conduction. As a core device for efficient heat transfer between hot and cold fluids, the heat exchanger is widely used in industrial refrigeration systems such as screw condensing units, and its performance directly affects the energy consumption level, operating efficiency and stability of the unit.

[0003] The existing patent document with the publication number CN222460377U is a frost-proof condensing heat exchanger. By turning on the heating module, the heating module generates heat, which is transferred to the protective shell through the heat pipe, thereby avoiding the absorption of heat by frost on the surface of the protective shell at low temperatures, reducing the efficiency of heat exchange. The flow rate of cold water is slowed down by the flow limiting plate, thereby increasing the contact time of cold water with the flow guide pipe, so that the cold water fully absorbs the heat in the high-temperature flue gas, thereby improving the efficiency of heat exchange. By turning the rotating frame inward, the rotating frame contacts the exhaust pipe, and then turning the screw fixes the exhaust pipe on the air inlet pipe, thereby preventing the exhaust pipe from loosening and causing flue gas leakage.

[0004] Although the above-mentioned frost-proof condensing heat exchanger can solve the corresponding technical problems, it performs poorly in energy saving, and the energy consumption is high during long-term operation; the heat exchange efficiency still has a large room for improvement, and it is difficult to fully realize the efficient use of energy.

[0005] Therefore, an energy-saving, efficient, easy-to-maintain and stable screw condensing unit heat exchanger is proposed to solve the shortcomings of the prior art. SUMMARY

[0006] The technical task of the present application is to solve the above-mentioned problems by providing an energy-saving and efficient heat exchanger of a screw condensing unit.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions: An energy-saving and efficient heat exchanger of a screw condensing unit, comprising a heat exchange mechanism connected with the screw condensing unit, the surface of which is provided with a heat preservation mechanism for heat preservation and energy storage, and the heat preservation mechanism is provided with a supporting mechanism for supporting, wherein: The heat preservation mechanism comprises two symmetrical heat preservation shells, and a cavity for placing the heat exchange mechanism is formed between the two heat preservation shells, and the two heat preservation shells are connected and fixed by the supporting mechanism.

[0008] As preferred, the heat exchange mechanism comprises a shell, a tube box, a heat exchange tube, a baffle plate, a tube plate, the tube box is provided with one at each end of the shell, the shell and the tube box at both ends are placed in the cavity together, one end of the bottom of the shell is communicated with a liquid inlet pipe, one end of the top of the shell is communicated with a liquid outlet pipe, check valves are installed on the liquid inlet pipe and the liquid outlet pipe, the check valves are spring check valves, one end of the top of one of the tube boxes is communicated with an air inlet pipe, one end of the bottom of the other tube box is communicated with an air outlet pipe, the tube plate is fixedly connected with one on both sides of the inner cavity of the shell, the two ends of the heat exchange tube are welded with the corresponding tube plate, the baffle plate is arranged in the inner cavity of the shell, the two ends of the heat exchange tube are communicated with the inner cavities of the two tube boxes, the inner cavities of the liquid inlet pipe, the shell and the liquid outlet pipe form a refrigerant flow channel, the inner cavities of the air inlet pipe, one of the tube boxes, the heat exchange tube, the other tube box and the air outlet pipe form a high-pressure gas flow channel of the screw compressor, wherein: The heat exchange tube is made of copper-aluminum alloy material and has a spiral structure, and at least two groups of the heat exchange tubes are arranged in the inner cavity of the shell from inside to outside, and each group of the heat exchange tubes is annularly distributed around the central axis of the shell. The baffle plate is arranged in the inner cavity of the shell in an up-down manner, each group of the baffle plates is arranged in the inner cavity of the shell and inclined along the length direction of the shell, and the inclination directions of the two groups of the baffle plates are opposite and staggered. The baffle plate comprises a plate body and a through hole, one plate body is welded between adjacent two groups of heat exchange tubes, the shell and the outermost group of heat exchange tubes, the plate body is an annular plate, the through hole is arranged on the plate body, the diameter of the through hole gradually decreases from the center of the shell to the inner wall surface, and the through hole is adapted to the annular distribution spacing of the heat exchange tube. The heat exchange mechanism further comprises a filter, one filter is arranged at the port of the liquid inlet pipe and the liquid outlet pipe. The filter comprises a filter shell, a first filter screen and a second filter screen, the ports of the liquid inlet pipe and the liquid outlet pipe are communicated with the corresponding filter shell through a sealing flange, the liquid inlet pipe is sealed and connected with the refrigerant supply end of the pipeline through the corresponding filter shell and the sealing flange, and the liquid outlet pipe is sealed and connected with the evaporator of the pipeline through the corresponding filter shell and the sealing flange.

[0009] As preferred, the first filter screen and the second filter screen are installed in the inner cavity of the filter shell in sequence along the refrigerant flow direction, the first filter screen is made of metal material and coated with an anti-corrosion coating on the surface, and the second filter screen is made of an activated carbon adsorption layer and doped with nano silver particles.

[0010] As preferred, the two ends of the heat preservation shell are respectively provided with avoiding sections corresponding to the connection between the shell and the pipe box, and a group of connecting pipe sections are integrally formed at the top and bottom of the heat preservation shell, and each group of the connecting pipe sections is provided with two connecting pipe sections along the length direction of the heat preservation shell, the connecting pipe sections are communicated with the inner cavity of the heat preservation shell, and the inlet pipe, the outlet pipe, the gas inlet pipe and the gas outlet pipe are respectively attached to the inner wall surface of the corresponding connecting pipe section.

[0011] As preferred, the heat preservation shell comprises a heat preservation layer and a phase change energy storage layer, the phase change energy storage layer is fixedly connected to the outer surface of the heat preservation layer, and the outer surfaces of the shell and the pipe box are attached to the inner wall surface of the heat preservation layer.

[0012] As preferred, the heat preservation layer is made of polyurethane foaming material into a hollow structure, and a plurality of strip-shaped partitions are integrally formed in the inner cavity of the heat preservation layer, the partitions are strip-shaped and uniformly distributed along the axial direction of the inner cavity of the heat preservation layer; the phase change energy storage layer is composed of a paraffin-based composite layer and a shell, the shell is made of stainless steel into an arc-shaped plate structure, the inner wall surface of the shell is attached to the outer surface of the paraffin-based composite layer, and the shell and the paraffin-based composite layer are fixedly bonded by high-temperature resistant silicone glue; the paraffin-based composite layer and the heat preservation layer are fixed by an epoxy resin adhesive.

[0013] As preferred, the supporting mechanism comprises a base and a fastener, the base is located below the heat preservation shell, the fastener is fixedly connected to the base, and the fastener tightly connects two heat preservation shells.

[0014] As preferred, the fastener is composed of four hoops, the inner diameter of the hoop is matched with the outer diameter of the heat preservation shell, and a nitrile rubber elastic gasket is fixedly connected to the contact part of the hoop and the heat preservation shell; one hoop is arranged on each of the two sides of the middle part of the heat preservation mechanism and the outer side of the avoiding section at each end of the heat preservation mechanism, each hoop simultaneously sleeves two symmetrical heat preservation shells, and the tight connection of the two heat preservation shells is realized by screwing the bolts.

[0015] As preferred, it further comprises a sensing assembly and a controller, the sensing assembly is arranged on the heat exchange mechanism and the heat preservation mechanism, and is wire-connected with the controller through a shielded cable. Three threaded mounting interfaces are respectively arranged on the pipe wall of the inlet pipe and the outlet pipe, two threaded mounting interfaces are respectively arranged on the pipe wall of the gas inlet pipe and the gas outlet pipe, and all the interfaces are used for mounting the sensing assembly and are 150mm away from the corresponding pipe end; The sensing assembly comprises a temperature sensor, a flow sensor, a pressure sensor and a temperature transmitter. Three preset interfaces of the liquid inlet pipe are respectively used for installing temperature sensors, pressure sensors and flow sensors, three preset interfaces of the liquid outlet pipe are respectively used for installing temperature sensors, pressure sensors and temperature transmitters, two preset interfaces of the gas inlet pipe are respectively used for installing temperature sensors and flow sensors, and two preset interfaces of the gas outlet pipe are respectively used for installing temperature sensors and temperature transmitters; The temperature transmitter is mounted on the side of the heat preservation shell, the detection end of the temperature transmitter penetrates the heat preservation layer and is attached to the outer surface of the shell, and the penetration part of the heat preservation layer is sealed by high-temperature resistant sealing glue; The signal output ends of the temperature sensors, the flow sensors and the pressure sensors are connected to the signal input ends of the controller through waterproof aviation plugs and cables, and the output end of the temperature transmitter is directly connected to the analog input module of the controller.

[0016] Preferably, the controller is a PLC controller, and a wireless communication module is arranged on the controller, so that the controller can perform data transmission with a remote monitoring terminal, and the controller is electrically connected with an emergency alarm module, the emergency alarm module includes an audible and visual alarm and a short message transmitter, and a support is fixedly connected to the base by bolts, and the controller is installed on the top of the support, so that the emergency alarm module can be triggered according to the abnormal signals of temperature, flow and pressure collected by the sensing assembly.

[0017] Compared with the prior art, the application has the following advantages and positive effects: 1. In the application, the heat exchange mechanism is designed in combination of the spiral heat exchange pipe and the staggered inclined baffle, so that the contact area and the contact time of the cold and hot fluids can be increased, the fluid flow path can be optimized, the flow can be uniformly distributed, and the heat transfer efficiency can be improved; meanwhile, the heat preservation layer and the phase change energy storage layer of the heat preservation mechanism work cooperatively to reduce heat loss in the heat exchange process, reduce the additional energy consumption of the unit, and realize the dual goals of energy saving and high efficiency. 2. In the application, the filter provided in the heat exchange mechanism can perform multi-stage filtration and purification on the refrigerant, so that impurities can be prevented from blocking the pipeline or damaging the core components, and the service life of the equipment can be prolonged; through the design of the symmetrical heat preservation shell and the clamp type fastener, the installation and disassembly process of the heat exchange mechanism is simplified, and the later maintenance is facilitated; the connection mode of the components is simple and reliable, the avoiding section and the connecting pipe section of the heat preservation shell are adapted to the pipeline layout, the structural interference is reduced, and the overall assembly convenience is improved. 3. In the application, the monitoring and alarm system formed by the sensing assembly and the controller can capture abnormal operation parameters in real time and trigger emergency response, effectively avoid the risk of fault expansion, and ensure stable operation of the system. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0019] Figure 1 Structure schematic diagram of the embodiment of the present application; Figure 2 Structure schematic diagram of the fastener in the open state of the embodiment of the present application; Figure 3 Structure schematic diagram of the heat exchange mechanism and the heat preservation mechanism of the embodiment of the present application; Figure 4 Exploded structure schematic diagram of the heat exchange mechanism and the heat preservation mechanism of the embodiment of the present application; Figure 5 Structure cross-sectional schematic diagram of the heat exchange mechanism of the embodiment of the present application; Figure 6 Structure schematic diagram of the heat exchange pipe and the baffle of the embodiment of the present application; Figure 7 Structure schematic diagram of the heat exchange pipe of the embodiment of the present application; Figure 8 Structure schematic diagram of the filter of the embodiment of the present application; Figure 9 Structure cross-sectional schematic diagram of the heat preservation shell of the embodiment of the present application; Figure 10 Structure schematic diagram of the embodiment of the present application Figure 9 Enlarged structure schematic diagram of A in the embodiment of the present application.

[0020] In the figure: 100, heat exchange mechanism; 110, shell; 111, liquid inlet pipe; 112, liquid outlet pipe; 120, pipe box; 121, gas inlet pipe; 122, gas outlet pipe; 130, heat exchange pipe; 140, baffle; 141, plate body; 142, through hole; 150, pipe plate; 160, filter; 161, filter shell; 162, first filter screen; 163, second filter screen; 200, heat preservation mechanism; 210, heat preservation shell; 211, avoiding section; 212, connecting pipe section; 213, heat preservation layer; 214, phase change energy storage layer; 300, support mechanism; 310, base; 311, support; 320, fastener; 400, controller. DETAILED DESCRIPTION

[0021] In order to enable the above-mentioned purposes, features and advantages of the present application to be more clearly understood, the present application will be further described below with reference to the drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0022] The present application will be further described below with reference to the drawings and specific embodiments. Embodiment 1

[0023] As shown in Figures 1-10 , the screw condensing unit of the embodiment of the present application belongs to a heat exchange device, and provides an energy-saving and efficient heat exchanger of a screw condensing unit, which comprises a heat exchange mechanism 100 connected with the screw condensing unit, the surface of which is provided with a heat preservation mechanism 200 for heat preservation and energy storage, and the heat preservation mechanism 200 is provided with a supporting mechanism 300 for supporting; the heat preservation mechanism 200 comprises two symmetrical heat preservation shells 210, a cavity for placing the heat exchange mechanism 100 is formed between the two heat preservation shells 210, and the two heat preservation shells 210 are connected and fixed through the supporting mechanism 300; on the one hand, the symmetrical heat preservation shells 210 form a dedicated cavity, which can precisely wrap the heat exchange mechanism 100 and preliminarily block the interference of the external environment on the heat exchange process; on the other hand, the supporting mechanism 300 connects and fixes the two heat preservation shells 210, which not only ensures the stable wrapping of the heat preservation shells 210 on the heat exchange mechanism 100, but also provides reliable bottom support for the whole device, ensuring the overall structural stability and the continuity of the heat exchange process. Embodiment 2

[0024] As shown in Figures 1-10 , the energy-saving and efficient heat exchanger of the screw condensing unit provided in the embodiment is applied to a 100kW screw condensing unit, and the refrigerant adopts R410A, the high-pressure gas temperature discharged by the screw compressor is 80-90℃, and the pressure is 2.4MPa, which is different from the embodiment 1 in that: The heat exchange mechanism 100 comprises a shell 110, a tube box 120, a heat exchange tube 130, a baffle plate 140 and a tube plate 150. The tube box 120 is installed at both ends of the shell 110, and the shell 110 and the tube box 120 at both ends are placed in a cavity. One end of the bottom of the shell 110 is communicated with a liquid inlet pipe 111, and one end of the top of the shell 110 is communicated with a liquid outlet pipe 112. A check valve is installed on the liquid inlet pipe 111 and the liquid outlet pipe 112. The check valve is a spring check valve, the opening pressure is 0.1 MPa, the minimum flow pressure of the R410A refrigerant is 0.08 MPa, the closing pressure is 0.05 MPa, the valve body is made of brass, the spring is made of 304 stainless steel, the temperature resistance is-20℃, the medium backflow is prevented, and the normal operation of the heat exchanger is ensured. The top of one tube box 120 is communicated with an air inlet pipe 121 near the liquid outlet pipe 112, and the bottom of the other tube box 120 is communicated with an air outlet pipe 122 near the liquid inlet pipe 111. The tube plate 150 is fixedly connected to both sides of the inner cavity of the shell 110. The two ends of the heat exchange tube 130 are welded and fixed to the corresponding tube plate 150. The baffle plate 140 is arranged in the inner cavity of the shell 110. The two ends of the heat exchange tube 130 are communicated with the inner cavities of the two tube boxes 120. The inner cavities of the liquid inlet pipe 111, the shell 110 and the liquid outlet pipe 112 form a refrigerant flow channel. The inner cavities of the air inlet pipe 121, one tube box 120, the heat exchange tube 130, the other tube box 120 and the air outlet pipe 122 form a high-pressure gas flow channel of a screw compressor. The independent refrigerant and high-pressure gas flow channels ensure that the two media are independent and do not interfere with each other, avoid the mixing of the media affecting the heat exchange effect or causing safety risks, and ensure the orderly progress of the heat exchange process. The heat exchange tube 130 is made of copper-aluminum alloy material and has a spiral structure. At least three groups of heat exchange tubes 130 are arranged in the inner cavity of the shell 110 from inside to outside. Each group of heat exchange tubes 130 is distributed in a ring shape around the central axis of the shell 110. The heat exchange tube 130 is adapted to the refrigerant flow of 15 m³ / h of a screw condensing unit. The spiral heat exchange tube 130 and the ring distribution design greatly increase the contact area of the cold and hot fluids, improve the heat transfer efficiency, and the baffle plate 140 is arranged in the inner cavity of the shell 110 in an up-down manner. Each group of baffle plates 140 is arranged in the inner cavity of the shell 110 and along the length direction of the shell 110. The inclination angles of the two groups of baffle plates 140 are opposite and staggered. The inclination angle of each group of baffle plates 140 is 15°-30°, and the distance between adjacent baffle plates 140 is 1.2-1.5 times; the design can guide the refrigerant to flow along a Z-shaped path, prolong the contact time while avoiding fluid dead zones; the staggered inclined baffles 140 can guide the fluid to form turbulent flow, prolong the residence time of the fluid in the shell 110, while uniformly distributing the refrigerant flow, avoiding local flow unevenness leading to heat exchange blind area, and improving heat exchange uniformity; the baffle 140 includes a plate body 141 and a through hole 142, the plate body 141 is welded between the adjacent two groups of heat exchange pipes 130, the shell 110 and the outermost group of heat exchange pipes 130 respectively, the plate body 141 is an annular plate, the through hole 142 is provided on the plate body 141, and the hole diameter of the through hole 142 gradually decreases from the center of the shell 110 to the inner wall surface, the through hole 142 is adapted to the annular distribution spacing of the heat exchange pipe 130, which can uniformly distribute the refrigerant flow in the cavity of the shell 110, and improve the heat exchange uniformity; the heat exchange mechanism 100 further comprises a filter 160, and the filter 160 is provided at the ports of the inlet pipe 111 and the outlet pipe 112; the setting of the filter 160 can filter the refrigerant of the inlet pipe 111 and the outlet pipe 112, prevent impurities from entering the shell 110 or subsequent equipment, protect the core components, and reduce the occurrence of faults; the filter 160 includes a filter shell 161, a first filter screen 162 and a second filter screen 163, the ports of the inlet pipe 111 and the outlet pipe 112 are communicated with the corresponding filter shell 161 through a sealing flange, the inlet pipe 111 is sealed and connected with the refrigerant supply end of the pipeline through the corresponding filter shell 161 and the sealing flange, the outlet pipe 112 is sealed and connected with the evaporator of the pipeline through the corresponding filter shell 161 and the sealing flange, and the first filter screen 162 and the second filter screen 163 are arranged in the inner cavity of the filter shell 161.

[0025] The first filter screen 162 and the second filter screen 163 are installed in the inner cavity of the filter shell 161 along the refrigerant flow direction in sequence, the first filter screen 162 is made of metal material and coated with an anti-corrosion coating on the surface, the second filter screen 163 is made of an activated carbon adsorption layer and doped with nano silver particles, the mass ratio of the added nano silver particles is 0.8%, and the nano silver particles are coated with silane coupling agent (KH-550) to avoid falling off and polluting the refrigerant; the first filter screen 162 and the second filter screen 163 arranged in sequence along the refrigerant flow direction form a multi-stage filtering system of coarse filtering and fine filtering, large-particle impurities are first intercepted by the metal filter screen, and then small impurities and odors are adsorbed by the activated carbon adsorption layer, thereby improving the refrigerant purification effect; the anti-corrosion coating on the surface of the first filter screen 162 can resist chemical corrosion of the refrigerant, thereby prolonging the service life of the filter screen; the nano silver particles doped in the second filter screen 163 can play an antibacterial role, thereby avoiding microbial breeding to block the filter screen or pollute the refrigerant, and further ensuring the cleanliness of the system; differential pressure sensors are additionally arranged at the front and rear ends of the filter shell 161, when the pressure difference is greater than or equal to 0.2 MPa, it is determined that the filter screen is blocked, and the filter screen needs to be replaced; when the filter screen is replaced, the filter shell 161 can be disassembled through the sealing flange, without the need to disassemble the pipeline.

[0026] The heat preservation shell 210 is provided with an avoiding section 211 at each end, the avoiding section 211 corresponds to the connection between the shell 110 and the pipe box 120, the top and bottom of the heat preservation shell 210 are integrally formed with a group of connecting pipe sections 212, each group of connecting pipe sections 212 is provided with two along the length direction of the heat preservation shell 210, the connecting pipe section 212 is communicated with the inner cavity of the heat preservation shell 210, the liquid inlet pipe 111, the liquid outlet pipe 112, the gas inlet pipe 121 and the gas outlet pipe 122 are respectively attached to the inner wall surface of the corresponding connecting pipe section 212; the avoiding section 211 accurately corresponds to the connection between the shell 110 and the pipe box 120, avoids the interference between the heat preservation shell 210 and the heat exchange mechanism 100, ensures that the heat preservation shell 210 can be closely attached to the heat exchange mechanism 100, and at the same time reserves a maintenance space for the connection part; the integrally formed connecting pipe section 212 can tightly wrap the liquid inlet pipe 111, the liquid outlet pipe 112, the gas inlet pipe 121 and the gas outlet pipe 122, avoids the direct contact between the pipeline and the external environment, reduces the heat loss of the pipeline, supplements the heat preservation coverage of the heat preservation shell 210 to the pipeline, and improves the overall heat preservation effect.

[0027] The heat preservation shell 210 includes a heat preservation layer 213 and a phase change energy storage layer 214, the phase change energy storage layer 214 is fixedly connected to the outer surface of the heat preservation layer 213, the outer surfaces of the shell 110 and the pipe box 120 are attached to the inner wall surface of the heat preservation layer 213; the heat preservation layer 213 is directly attached to the outer surface of the heat exchange mechanism 100, can directly block the heat exchange between the heat exchange mechanism 100 and the external environment, and reduces the heat loss in the heat exchange process; the phase change energy storage layer 214 is attached to the outer side of the heat preservation layer 213, can absorb or release heat when the temperature of the heat exchange mechanism 100 fluctuates, smoothes the temperature change, avoids the influence of sudden temperature change on the heat exchange efficiency or damages the equipment, and at the same time further assists the heat preservation layer 213 to reduce the heat loss, improves the heat preservation and operation stability.

[0028] The thermal insulation layer 213 is made of polyurethane foaming material (density 40 kg / m³) into a hollow structure, and a plurality of strip-shaped partitions are integrally formed in the inner cavity of the thermal insulation layer 213, which are strip-shaped and uniformly distributed along the axial direction of the inner cavity of the thermal insulation layer 213, can block the radial air convection in the inner cavity, and strengthen the thermal insulation effect; the phase change energy storage layer 214 is composed of a paraffin-based composite layer and a shell, the shell is made of 304 stainless steel into an arc-shaped plate structure, the inner wall surface of the shell is attached to the outer surface of the paraffin-based composite layer, and the shell and the paraffin-based composite layer are fixed by high-temperature resistant silicone adhesive; the paraffin-based composite layer and the thermal insulation layer 213 are fixed by epoxy resin adhesive; the model of the epoxy resin adhesive is E-44, and the thermal conductivity is 0.025 W / (m·K); the paraffin-based composite layer is made of modified paraffin-based energy storage composite material, the phase change temperature range is 40-60°C, which is suitable for the condensation temperature of R410A refrigerant 38-42°C, the phase change latent heat is 200 kJ / kg, and the actual measured temperature fluctuation range is within ±3°C; at the same time, the thermal conductivity of the epoxy resin adhesive between the thermal insulation layer 213 and the phase change energy storage layer 214 is less than 0.03 W / (m·K), which can block the reverse heat transfer of the paraffin-based composite phase change layer to the thermal insulation layer 213, and avoid affecting the thermal insulation effect; the 304 stainless steel shell can not only protect the internal paraffin-based composite layer from external impact or corrosion, but also adapt to the arc-shaped structure of the thermal insulation shell 210, and ensure the attachment; the use of high-temperature resistant silicone adhesive and epoxy resin adhesive respectively ensures the reliable connection of the shell and the paraffin-based composite layer, the paraffin-based composite layer and the thermal insulation layer, avoids delamination, and helps to prolong the service life of the thermal insulation mechanism 200.

[0029] In the embodiment, the thermal buffering efficiency of the phase change energy storage layer 214 is quantified by the following equation: ; Wherein: ΔT stabilize is the surface temperature fluctuation suppression value (°C) of the shell 110; τ is the thermal response time constant (s), which is determined by the thermal conductivity and thickness of the thermal insulation layer 213; δ is the phase change material coverage rate (0.9-0.95); T shell is the real-time temperature (°C) of the shell; T pcm is the center temperature (°C) of the phase change material; λ is the phase change interval width parameter (value 3.5-4.5); Q latent is the unit area phase change latent heat (kJ / m²); t1-t2 is the running time interval (s).

[0030] Example: in the operation of a 100 kW unit, the parameters are set as follows: τ=120s (when the polyurethane thickness is 50mm); δ=0.93; T pcm =40℃ (phase transition point of paraffin-based materials); λ=4.0; Q latent =15.8kJ / m 2 .

[0031] When T is detected shell When the temperature rises from 38℃ to 43℃, the equation calculates ΔT. stabilize =2.8℃, and the actual temperature fluctuation was ±2.9℃. This data can verify the accuracy of the equation.

[0032] Technical effects: 1. Energy saving quantification: through ΔT stabilize Directly related to temperature fluctuations and energy consumption, each 1°C reduction in fluctuation can reduce compressor power consumption by 4.2% (actual data). The phase change layer and the insulation layer work together to control the shell temperature fluctuation within ±3°C (actual measurement). Combined with the energy-saving quantification formula (each 1°C reduction in fluctuation reduces compressor power consumption by 4.2%), it can reduce the compressor's additional energy consumption by approximately 12.6%. The polyurethane insulation layer (density 40kg / m³, strip partition) blocks radial air convection, and the phase change layer has an inverse thermal conductivity of <0.03W / (m・K), reducing heat loss during heat exchange by more than 8% (compared to traditional insulation structures). 2. Material optimization: λ and Q in the equation latent The formulation of phase change materials was guided, which increased the latent heat of the paraffin-based composite layer to 200 kJ / kg; 3. Fault warning: When the actual ΔT stabilize At temperatures below 2.5℃, a phase change material failure alarm is triggered. 4. Improve heat exchange efficiency: Contact area and time optimization: Spiral copper-aluminum alloy heat exchange tubes (3 sets × 8 rings) increase the contact area by more than 30%, and staggered inclined baffles (15-30°) guide the refrigerant to flow in a "Z" shape, extending the contact time by 25% and avoiding fluid dead zones; Flow uniformity: The baffle plate has a gradually changing aperture design to match the annular spacing of the heat exchange tubes, so that the refrigerant flow distribution deviation is ≤5%, avoiding local heat exchange blind spots and improving heat exchange efficiency by 15%-20% (compared to the patented structure CN222460377U).

[0033] Working principle and process: ① Sensors collect T data in real time shell Transmitted to controller 400 ② The controller solves for the hyperbolic tangent term tanh(·) in the equation to dynamically calculate the heat absorption / release rate of the phase change material; ③ When ∣T shell −T pcm ∣>λ, tanh function saturates output ±1, at this time Q latent completely release / absorb; ④ Calculate the result ΔT stabilize feedback to the compressor frequency conversion module, automatic adjustment of refrigerant flow; ⑤ If continuous 10 minutes , determine the aging of the phase change layer and alarm.

[0034] Equation description: 1. Nonlinear coupling: Accurately describe the nonlinear energy storage characteristics of the phase change transition zone (35-42℃) by tanh(·) function, instead of traditional step function; 2. Dynamic response: Introduce time constant τ to quantify the delay effect of thermal inertia of the insulation layer on the phase change process; 3. Engineering adaptation: λ parameter is related to the gradient design of the hole 142 (hole diameter decreases from center to outside), when λ>4.2, the baffle 140 inclination angle needs to be increased.

[0035] The equation has been verified by ANYSYS simulation: under the sudden change of condensation temperature working condition, the prediction energy consumption error is ≤3.7% compared with the actual error, which is significantly better than the traditional Fourier model (error 12.5%).

[0036] The equation design logic (derivation basis): 1. Nonlinear characteristic description: Introduce hyperbolic tangent function tanh(·), replace traditional step function, accurately describe the "gradual energy storage" characteristics (non-sudden change) of phase change transition zone (35-42℃), which is consistent with the actual working process of phase change material.

[0037] 2. Thermal inertia coupling: Introduce τ (thermal response constant of insulation layer) to quantify the delay effect of insulation layer on phase change process, avoid ignoring the synergistic effect of insulation layer and phase change layer.

[0038] 3. Engineering practicability: Parameter λ (phase change interval width) is related to the gradient design of the hole of the baffle (hole diameter decreases from center to outside), when λ>4.2, the flow distribution can be optimized by adjusting the inclination angle of the baffle, realizing the linkage of equation and structure design.

[0039] The support mechanism 300 comprises a base 310 and a fastener 320, the base 310 is located below the heat preservation shell 210, the fastener 320 is fixedly connected to the base 310, and the fastener 320 tightly connects the two heat preservation shells 210; the base 310 is located below the heat preservation shell 210, provides a stable bottom bearing foundation for the entire device, disperses the weight of the device, and avoids corrosion or wear caused by direct contact of the device with the ground; the fastener 320 is fixed to the base 310 and connected to the two heat preservation shells 210, can tightly fix the heat preservation shell 210 and the heat exchange mechanism 100 as a whole, prevents loosening of the heat preservation shell 210 or deviation of the heat exchange mechanism 100 during operation of the device, and guarantees the structural stability and continuity of the heat exchange process.

[0040] The fastener 320 is composed of four hoops, the inner diameter of the hoop is matched with the outer diameter of the heat preservation shell 210, the material of the hoop is Q235 steel, each hoop is matched with a stainless steel bolt, and a nitrile rubber elastic gasket is fixedly connected to the contact part of the hoop and the heat preservation shell 210, so as to avoid vibration and wear of the heat preservation shell 210; one hoop is arranged outside each of the two sides of the middle part of the heat preservation mechanism 200 and the avoidance section 211 at both ends of the heat preservation mechanism 200, each hoop is simultaneously sleeved with two symmetrical heat preservation shells 210, and the two heat preservation shells 210 are tightly connected by screwing the bolts; the four hoops are arranged outside the two sides of the middle part and both ends of the avoidance section of the heat preservation mechanism 200, form a four-point fixed balanced force structure, avoid deformation of the heat preservation shell caused by excessive local stress; each hoop is simultaneously sleeved with two symmetrical heat preservation shells 210, and the two heat preservation shells 210 are tightly connected by screwing the bolts, which can not only ensure stable wrapping of the heat preservation shell 210 on the heat exchange mechanism 100, but also facilitate disassembly and maintenance in the later period, and takes into account the fixing reliability and operation convenience.

[0041] Also include the sensing components and the controller 400, sensing components are jointly provided on the heat exchange mechanism 100 and the heat preservation mechanism 200, and with the controller 400 through the shielded cable realizes wired electric connection;The pipe wall of the liquid inlet pipe 111, the liquid outlet pipe 112, the gas inlet pipe 121 and the gas outlet pipe 122 are respectively provided with three threaded mounting interfaces, two threaded mounting interfaces, all the interfaces are used for sensing component installation and the distance corresponding pipe end 150mm;The preset threaded mounting interface provides accurate installation position for sensing component, ensures that the sensor can accurately collect pipeline medium parameters;The sensing component includes temperature sensor, flow sensor, pressure sensor and temperature transmitter;The three preset interfaces of the liquid inlet pipe 111 are respectively used for installing temperature sensor, pressure sensor and flow sensor, the three preset interfaces of the liquid outlet pipe 112 are respectively used for installing temperature sensor, pressure sensor and temperature transmitter, the two preset interfaces of the gas inlet pipe 121 are respectively used for installing temperature sensor and flow sensor, the two preset interfaces of the gas outlet pipe 122 are respectively used for installing temperature sensor and temperature transmitter;The temperature transmitter is installed on the side of the heat preservation shell 210, the detection end penetrates the heat preservation layer 213 and is attached to the outer surface of the shell 110, and the penetration of the heat preservation layer 213 is sealed by high temperature resistant sealant;The temperature transmitter and the temperature sensor on the liquid outlet pipe 112 are installed in the same pipe section, and are circumferentially staggered by 5mm, and both penetrate into the pipe by 1 / 3 pipe diameter, to ensure that the medium temperature at the same position is collected;When the temperature transmitter fails (signal interruption> 5 seconds), the data deviation of the switched temperature sensor and the original transmitter data is ≤±0.3℃, which meets the monitoring accuracy requirement;The functional division and redundancy backup design of temperature sensor and temperature transmitter can not only ensure the monitoring accuracy through the standard signal output of temperature transmitter, but also switch to temperature sensor signal when temperature transmitter fails, to avoid monitoring interruption;Sensing component failure redundancy mechanism: when the temperature transmitter fails (signal interruption> 5 seconds), the corresponding pipeline temperature sensor signal (accuracy ±0.5℃) is automatically switched;The flow sensor or pressure sensor signal interruption or exceeds the normal range (flow ≤5m³ / h or ≥20m³ / h, pressure ≤0.5MPa or ≥3.When the pressure sensor signal output is abnormal (pressure sensor signal output is less than 0MPa or greater than 0.8MPa) for 3 seconds, the controller 400 triggers the emergency alarm module and suspends the refrigerant supply pump to avoid damage to the equipment due to no medium or overpressure operation, and after the parameters return to the normal range, the supply is automatically restored after a delay of 30 seconds; if the abnormality is repeated within 10 minutes, it is locked and waits for manual reset; the signal output ends of the temperature sensor, the flow sensor, and the pressure sensor are connected to the signal input end of the controller 400 through waterproof aviation plugs and cables; the output end of the temperature transmitter is directly connected to the analog input module of the controller 400; the use of waterproof aviation plugs and shielded cables ensures stable transmission of sensing signals under complex working conditions (such as humidity and electromagnetic interference), reduces the risk of signal distortion or interruption, and provides a reliable data foundation for subsequent abnormality determination; the temperature sensor is used to collect real-time temperature raw signals of the medium in the corresponding pipeline, and the temperature transmitter is used to convert the temperature signals of the medium in the liquid outlet pipe 112 and the gas outlet pipe 122 into 4-20mA standard analog signals; the controller 400 monitors the output signal of the temperature transmitter in real time, and if the signal is interrupted or exceeds the 4-20mA range for 5 seconds, it is determined that the temperature transmitter is faulty, and then the raw signal (accuracy ±0.5°C) output by the temperature sensor of the corresponding pipeline is automatically switched as the basis for determination, realizing temperature detection redundancy backup.

[0042] The controller 400 adopts a PLC controller, and a wireless communication module is arranged thereon, which can perform data transmission with a remote monitoring terminal. The controller 400 is further electrically connected with an emergency alarm module, and the emergency alarm module includes an audible and visual alarm and a short message sender. The base 310 is fixedly connected with a support 311 through bolts, and the controller 400 is installed on the top of the support 311, which can trigger the emergency alarm module to work according to the temperature, flow and pressure abnormal signals collected by the sensing assembly. The controller 400 integrates the wireless communication module, supports the remote monitoring terminal to obtain the equipment operation data in real time, realizes intelligent remote control, and reduces the labor management cost. The audible and visual alarm and the short message sender of the emergency alarm module can timely notify the management personnel through multiple early warning methods when the parameters are abnormal, so as to avoid the expansion of the fault. The support 311 fixes the controller 400 on the base 310, which not only ensures the stable installation of the controller 400, but also avoids the direct contact of the controller 400 with the ground, thereby ensuring the running stability of the controller 400.

[0043] Working principle: When the screw condensing unit is running, the high-pressure gas discharged by the screw compressor enters one of the pipe boxes 120 through the gas inlet pipe 121, and is then distributed to the multiple groups of spiral heat exchange pipes 130 in the shell 110 through the pipe box 120. At the same time, the refrigerant flows out of the evaporator, passes through the first filter screen 162 in the filter shell 161 to intercept large-particle impurities, and then passes through the second filter screen 163 to adsorb small impurities and odors, and then enters the inside of the shell 110 through the liquid inlet pipe 111, forming a counter-flow heat exchange structure in which the high-pressure gas flows in the heat exchange pipes 130 and the refrigerant flows in the shell 110 and outside the heat exchange pipes 130. The staggered baffle plates 140 inside the shell 110 guide the refrigerant to flow along a "Z-shaped" path, prolonging the contact time of the refrigerant with the heat exchange tubes 130, while evenly distributing the refrigerant flow through the gradually changing aperture of the through holes 142, ensuring that each heat exchange tube 130 is in full contact with the refrigerant; the spiral-shaped structure of the heat exchange tubes 130 increases the contact area between the high-pressure gas and the refrigerant, allowing the heat of the high-pressure gas to be efficiently transferred to the refrigerant, completing the condensation of the high-pressure gas and the heat absorption and temperature rise of the refrigerant; the heat-exchanged high-pressure gas becomes liquid, which is collected through the other tube box 120 and then discharged from the gas outlet pipe 122, while the heated refrigerant passes through the filter shell 161 at the outlet of the liquid pipe 112, sequentially intercepting metal debris that may be generated in the pipeline through the first filter screen 162, and then adsorbing residual impurities and refrigerant decomposition products through the second filter screen 163, and finally being transported to the evaporator through the pipeline connected by the sealing flange for recycling; The heat preservation layer 213 of the heat preservation mechanism 200 closely adheres to the outer surface of the heat exchange mechanism 100, blocking heat loss during the heat exchange process; the phase change energy storage layer 214 absorbs or releases heat in real time according to the temperature change of the heat exchange mechanism 100, and when the surface temperature of the shell 110 rises to 42℃ (the upper limit of the R410A condensation temperature), the paraffin-based composite layer begins to absorb heat (energy release rate 15kJ / min), avoiding a temperature exceeding 45℃; when the surface temperature of the shell 110 drops to 35℃ (the lower limit of the condensation temperature), the paraffin-based composite layer begins to release energy (energy release rate 12kJ / min), avoiding a temperature below 30℃; through this process, the temperature fluctuation is stabilized within ±3℃, reducing the additional energy consumption of the unit due to sudden temperature changes, avoiding the influence of sudden temperature changes on the heat exchange efficiency, and ensuring the stability of the heat exchange process; The sensor assembly collects the temperature, flow rate, and pressure parameters of the medium in each pipeline, as well as the surface temperature of the shell 110 in real time; the temperature sensor collects the original signal, and the temperature transmitter converts the key temperature signal into a 4-20mA standard analog signal, which is transmitted to the controller 400 through a waterproof aviation plug and a shielded cable; the controller 400 monitors the output signal of the temperature transmitter in real time, and if the signal is interrupted or exceeds the 4-20mA range for more than 5 seconds, it is determined that the temperature transmitter has failed, and the original signal output by the temperature sensor of the corresponding pipeline is automatically switched as the basis for judgment; if the parameters exceed the pre-set abnormal range, the emergency alarm module is immediately triggered: the audible and visual alarm (decibel value ≥85dB) issues an on-site warning, the SMS sender pushes abnormal information (including abnormal parameters, time, and equipment number) to the pre-set manager's mobile phone number, and at the same time, the abnormal data is uploaded to the remote monitoring terminal through the wireless communication module (4G / 5G), realizing the timely discovery and handling of faults and ensuring the safe and stable operation of the system; The base 310 of the supporting mechanism 300 provides stable bearing for the device, the clamp fastener 320 ensures the close wrapping of the heat exchange mechanism 100 by the heat preservation shell 210, the butyl rubber pad at the contact part of the clamp and the heat preservation shell 210 can avoid structural deviation and wear caused by operation vibration; the symmetrical design of the heat preservation shell 210 and the clamp can quickly disassemble the heat preservation shell 210 by removing the bolts, which is convenient for later maintenance or replacement of parts of the heat exchange mechanism 100.

[0044] In summary, the energy-saving and efficient heat exchanger of the screw condensing unit realizes multiple effects of energy saving, high efficiency, convenient maintenance and monitoring alarm through the collaborative design of the heat exchange mechanism 100, the heat preservation mechanism 200, the supporting mechanism 300, the sensing assembly and the controller 400.

[0045] Through the above specific embodiments, the skilled in the art can easily implement the present application. However, it should be understood that the present application is not limited to the above specific embodiments. On the basis of the disclosed embodiments, the skilled in the art can arbitrarily combine different technical features to realize different technical solutions.

Claims

1. An energy efficient heat exchanger of a screw condensing unit, characterized in that, The system includes a heat exchange mechanism (100) connected to a screw condenser unit, the surface of which is provided with an insulation mechanism (200) for heat preservation and energy storage, and the insulation mechanism (200) is provided with a support mechanism (300) for support, wherein: The heat preservation mechanism (200) includes two symmetrically arranged heat preservation shells (210), and a cavity for placing the heat exchange mechanism (100) is formed between the two heat preservation shells (210), and the two are connected and fixed by a support mechanism (300).

2. The energy efficient heat exchanger of the screw condensing unit as claimed in claim 1, wherein: The heat exchange mechanism (100) includes a shell (110), a tube box (120), heat exchange tubes (130), a baffle plate (140), and a tube sheet (150). One tube box (120) is installed at each end of the shell (110). The shell (110) and the tube boxes (120) at both ends are placed within a cavity. One end of the bottom of the shell (110) is connected to an inlet pipe (111), and one end of its top is connected to an outlet pipe (112). Both the inlet pipe (111) and the outlet pipe (112) are equipped with check valves, which are spring-loaded check valves. One of the tube boxes (120) has an air inlet pipe (121) connected to its top and near the outlet pipe (112), and the other tube box (120) has an air inlet pipe (121) connected to its bottom and near the outlet pipe (112). A liquid inlet pipe (111) is connected to an outlet pipe (122) on its side. One tube sheet (150) is fixedly connected to each side of the inner cavity of the shell (110). The two ends of the heat exchange tube (130) are welded and fixed to the corresponding tube sheet (150). A baffle plate (140) is located in the inner cavity of the shell (110). The two ends of the heat exchange tube (130) are connected to the inner cavities of two tube boxes (120). A refrigerant flow channel is formed between the inner cavities of the liquid inlet pipe (111), the shell (110), and the outlet pipe (112). A high-pressure gas flow channel for the screw compressor is formed between the inner cavities of the inlet pipe (121), one of the tube boxes (120), the heat exchange tube (130), the other tube box (120), and the outlet pipe (122). Wherein: The heat exchange tube (130) is made of copper-aluminum alloy material in a spiral structure, and at least two sets of them are arranged in the inner cavity of the shell (110) from the inside to the outside. Each set of heat exchange tubes (130) has multiple tubes arranged in a ring around the central axis of the shell (110). The baffles (140) are arranged in two sets, one above the other, in the inner cavity of the shell (110). Each set of baffles (140) is arranged in multiple sets in the inner cavity of the shell (110) and along the length of the shell (110). The two sets of baffles (140) are arranged in opposite directions and are staggered. The baffle plate (140) includes a plate body (141) and a through hole (142). The plate body (141) is welded between two adjacent sets of heat exchange tubes (130), the shell (110) and the outermost set of heat exchange tubes (130). The plate body (141) is an annular plate. The through hole (142) is opened on the plate body (141), and the diameter of the through hole (142) gradually decreases from the center of the shell (110) to the inner wall. The through hole (142) is adapted to the annular distribution spacing of the heat exchange tubes (130). The heat exchange mechanism (100) also includes a filter (160), which is provided at the ports of the inlet pipe (111) and the outlet pipe (112); The filter (160) includes a filter housing (161), a first filter screen (162) and a second filter screen (163). The ports of the inlet pipe (111) and the outlet pipe (112) are respectively connected to the corresponding filter housing (161) through sealing flanges. The inlet pipe (111) is connected to the pipeline through the corresponding filter housing (161) and the refrigerant supply end by sealing flanges. The outlet pipe (112) is connected to the pipeline through the corresponding filter housing (161) and the evaporator by sealing flanges. The first filter screen (162) and the second filter screen (163) are both located in the inner cavity of the filter housing (161).

3. The energy efficient heat exchanger of the screw condensing unit as claimed in claim 2, wherein: The first filter (162) and the second filter (163) are installed in the inner cavity of the filter shell (161) in sequence along the refrigerant flow direction. The first filter (162) is made of metal and has an anti-corrosion coating on its surface. The second filter (163) has an activated carbon adsorption layer and is doped with nano-silver particles.

4. The energy efficient heat exchanger of the screw condensing unit as claimed in claim 2, wherein: The insulation shell (210) has clearance sections (211) at both ends. The clearance sections (211) correspond to the connection between the shell (110) and the pipe box (120). The top and bottom of the insulation shell (210) are integrally formed with a set of connecting pipe sections (212). Each set of connecting pipe sections (212) has two sections along the length of the insulation shell (210). The connecting pipe sections (212) are connected to the inner cavity of the insulation shell (210). The liquid inlet pipe (111), liquid outlet pipe (112), air inlet pipe (121) and air outlet pipe (122) are respectively attached to the inner wall surface of the corresponding connecting pipe section (212).

5. The energy efficient heat exchanger of the screw condensing unit as claimed in claim 4, wherein: The insulation shell (210) includes an insulation layer (213) and a phase change energy storage layer (214). The phase change energy storage layer (214) is fixedly connected to the outer surface of the insulation layer (213). The outer surfaces of the shell (110) and the pipe box (120) are in contact with the inner wall of the insulation layer (213).

6. The energy efficient heat exchanger of the screw condensing unit as claimed in claim 5 wherein: The insulation layer (213) is made of polyurethane foam material to form a hollow structure. Its inner cavity is integrally formed with several strip-shaped partitions. The partitions are strip-shaped and evenly distributed along the inner cavity axis of the insulation layer (213). The phase change energy storage layer (214) is composed of a paraffin-based composite layer and a protective shell. The protective shell is made of 304 stainless steel to form an arc-shaped plate structure. Its inner wall surface is attached to the outer surface of the paraffin-based composite layer. The protective shell and the paraffin-based composite layer are bonded and fixed by high-temperature resistant silicone adhesive. The paraffin-based composite layer and the insulation layer (213) are fixed by epoxy resin adhesive.

7. The energy-saving and high-efficiency heat exchanger of the screw condensing unit according to claim 1, characterized in that: The support mechanism (300) includes a base (310) and a fastener (320). The base (310) is located below the insulation shell (210), and the fastener (320) is fixedly connected to the base (310). The fastener (320) tightly connects the two insulation shells (210).

8. The energy-saving and high-efficiency heat exchanger of the screw condensing unit according to claim 7, characterized in that: The fastener (320) consists of four clamps. The inner diameter of the clamp is adapted to the outer diameter of the insulation shell (210), and a nitrile rubber elastic gasket is fixedly connected to the contact part with the insulation shell (210). There is one clamp on each side of the middle part of the insulation mechanism (200) and on the outside of the clearance section (211) at both ends of the insulation mechanism (200). Each clamp is fitted with two symmetrical insulation shells (210) at the same time. The two insulation shells (210) are tightly connected by tightening the bolts.

9. The energy-saving and high-efficiency heat exchanger of the screw condensing unit according to claim 7, characterized in that: It also includes a sensing component and a controller (400). The sensing component is jointly mounted on the heat exchange mechanism (100) and the insulation mechanism (200), and is wiredly connected to the controller (400) via a shielded cable. The inlet pipe (111) and outlet pipe (112) each have three threaded mounting interfaces on their pipe walls, and the inlet pipe (121) and outlet pipe (122) each have two threaded mounting interfaces on their pipe walls. All interfaces are used for mounting the sensing components and are 150mm away from the corresponding pipe ends. The sensing components include a temperature sensor, a flow sensor, a pressure sensor, and a temperature transmitter. The three preset ports of the liquid inlet pipe (111) are used to install a temperature sensor, a pressure sensor and a flow sensor, respectively. The three preset ports of the liquid outlet pipe (112) are used to install a temperature sensor, a pressure sensor and a temperature transmitter, respectively. The two preset ports of the air inlet pipe (121) are used to install a temperature sensor and a flow sensor, respectively. The two preset ports of the air outlet pipe (122) are used to install a temperature sensor and a temperature transmitter, respectively. The temperature transmitter is installed on the side of the insulation shell (210), and its probe penetrates the insulation layer (213) and is attached to the outer surface of the shell (110). The penetration point with the insulation layer (213) is sealed with high temperature resistant sealant. The signal output terminals of the temperature sensor, flow sensor, and pressure sensor are respectively connected to the signal input terminal of the controller (400) via waterproof aviation plugs and cables; the output terminal of the temperature transmitter is directly connected to the analog input module of the controller (400).

10. The energy-saving and high-efficiency heat exchanger of the screw condenser unit according to claim 9, characterized in that: The controller (400) is a PLC controller and is equipped with a wireless communication module, which can transmit data with a remote monitoring terminal. The controller (400) is also electrically connected to an emergency alarm module, which includes an audible and visual alarm and an SMS transmitter. A support (311) is fixedly connected to the base (310) by bolts. The controller (400) is installed on the top of the support (311) and can trigger the emergency alarm module to work based on abnormal temperature, flow and pressure signals collected by the sensing components.

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