CN110986656A

CN110986656A - Flooded heat exchanger capable of online deicing and descaling

Info

Publication number: CN110986656A
Application number: CN201911292059.1A
Authority: CN
Inventors: 季能平; 金凤; 桂树强; 季天娇
Original assignee: Jiangsu Shanglong Water Supply Equipment Co Ltd
Current assignee: Jiangsu Shanglong Water Supply Equipment Co Ltd
Priority date: 2019-12-16
Filing date: 2019-12-16
Publication date: 2020-04-10

Abstract

The invention discloses a flooded heat exchanger capable of deicing and descaling online, belonging to the field of cooling and heating systems for buildings. The mechanical deicing and descaling device is arranged in the heat exchange tube, so that the growing ice layer and water scale in the heat exchange tube can be cut and removed, the deicing and descaling effects can be realized in a continuous working state without stopping the operation of equipment, and the heat exchanger is an efficient heat exchanger capable of deicing and descaling online.

Description

Flooded heat exchanger capable of online deicing and descaling

Technical Field

The invention belongs to the field of refrigeration systems for buildings, and particularly relates to a flooded heat exchanger capable of deicing and descaling online.

Background

1. Ice storage

The cold accumulation air conditioner utilizes the night valley price electricity to refrigerate and store in the cold accumulation device, releases the stored cold energy in the daytime, reduces the electricity load and the electricity consumption of the air conditioner in the peak price electricity period, reduces the electricity charge, reduces the installed capacity of the air conditioning unit, and represents the development direction of the central air conditioner in the world.

The existing cold storage modes are divided into water cold storage and ice cold storage, the specific heat of water is about 4.2KJ/kgK, the phase change latent heat of ice water is about 335KJ/kg, if the cold storage temperature difference of the water cold storage (same as the temperature difference of supply and return water of an air conditioner) is 8 ℃, the unit cold storage amount is about 33.6KJ/kg and is only about 10 percent of that of the ice cold storage mode, and the volume of the water cold storage pool is about 8 times that of the ice cold storage pool on the premise of the same cold storage amount. Although the refrigeration energy efficiency ratio (EER ═ 5.0) of water cold storage is high, in view of the limitation of factors such as building area and construction cost, the ice cold storage mode is usually adopted in the engineering to increase the cold storage amount and reduce the operation cost. The conventional ice cold storage mainly adopts glycol-containing anti-freezing liquid as secondary refrigerant, obtains low-temperature fluid with the temperature of less than 0 ℃ from an evaporator of a heat pump unit, circularly leads the low-temperature fluid into an ice storage coil pipe, refrigerates and freezes water in an ice storage tank, stores ice on the coil pipe, melts the ice in the daytime at the peak price electricity time period, and releases the cold for cooling. The integrated energy efficiency ratio EERb of ice storage and cold release is low (about 2.6-2.8), and is only about 60% of the refrigeration energy efficiency ratio of a unit for water cold storage.

The conventional ice cold storage is provided with an ice storage coil and a water tank, the ice storage coil is immersed in water in the water tank, the heat transfer area required by the ice storage coil is about 20-25 times of the heat transfer area of an evaporator of a heat pump unit, the ice storage unit is large in size, the manufacturing cost of the ice storage unit is about 75% of the price of a refrigeration power heat pump unit, and the manufacturing cost of the ice storage coil, a secondary circulating pump, a plate exchanger and pipelines of the plate exchanger accounts for 2/3 and above of the ice storage unit, so that the total manufacturing cost of the ice cold storage heat pump unit is high, and the early investment is also high. When the ice coil is adopted for ice making and cold storage, in the ice making period of 8 hours, as the ice thickness outside the tube is gradually increased (from 0 to 25mm), the thermal conduction resistance is continuously increased, so that the heat transfer coefficient of the heat exchange tube is continuously reduced, and the following two adverse results are caused:

1) on the premise of the same heat transfer power, the heat transfer temperature difference is continuously increased, the refrigeration temperature in the pipe is continuously reduced, the evaporation temperature of the heat pump unit is continuously reduced, and the energy efficiency ratio of the heat pump unit is continuously reduced.

2) On the premise of the same heat transfer temperature difference, the heat transfer power is continuously reduced, the final heat transfer power is only about 28% of the initial heat transfer power, and the average cold transfer power is about 50% of the initial heat transfer power; therefore, the actual refrigerating capacity of the ice storage of the ice coil pipe is about 45% of the refrigerating power of the unit, and the increase of the cold storage capacity in the valley price electricity period is severely limited.

Therefore, the prior art has the advantages of small cold storage amount in a limited time, low refrigeration energy efficiency ratio and high manufacturing cost.

2. Damage of glycol antifreezing solution

In the prior heat pump technology, an antifreeze containing glycol is usually selected as an intermediate secondary refrigerant to adapt to ice making cold accumulation or low-temperature heat extraction under a low-temperature working condition; because the antifreeze aqueous solution containing glycol is oxidized to form oxalic acid (oxalic acid) after contacting with air, the oxalate has larger corrosivity to metal materials, especially to stainless steel materials, the prior ice storage coil adopts carbon steel materials, and for steel pipes with the wall thickness of 2mm, the age of pitting is about 8-10 years, so the service life is shorter. Meanwhile, the oxalic acid is toxic and causes death to adults by 15-30g, so that the ice-making cold storage device containing the glycol antifreeze solution can only be used singly but cannot be used together, and cleaning, discharging and pollution during season change are avoided; more serious, the energy efficiency ratio of the system is low because the ice making, cold storage and cold release of the intermediate secondary refrigerant are selected, and secondary heat exchange and secondary pump consumption are required to be additionally increased.

3. Low temperature heat extraction in winter

In the prior art, in order to improve the heat transfer coefficient and reduce the heat exchange area, a flooded evaporator is usually selected and a high-efficiency heat exchange tube is selected. The flooded evaporator is an evaporator in which the medium outside the heat exchange tube (shell pass) is refrigerant evaporation liquid and the medium inside the heat exchange tube (tube pass) is water. For the heat supply of the water source heat pump unit in winter, the evaporator is prevented from being frozen and damaged due to the limitation of the temperature of a freezing point of water, the evaporation temperature of a refrigerant in the evaporator is set to be about 2 ℃ at the lowest and is less than the set temperature, and the unit is automatically stopped. The heat transfer temperature difference of the evaporator is generally 5 ℃, so the water outlet temperature of the evaporator is generally controlled to be above 4 ℃, the water inlet temperature (water source temperature) is generally above 8-9 ℃, and the temperature is less than the water inlet temperature, and the heat pump unit cannot effectively supply heat. The conventional solution is to add an auxiliary heat source for direct heat supply, such as an electric, natural gas, coal and other auxiliary heat sources, and the heat supply energy efficiency ratio of the auxiliary heat source is less than 1, so that the heat supply energy efficiency ratio in winter is extremely low, and the economical efficiency is poor.

Since the temperature of surface water varies with changes in climate temperature. Taking the water temperature in winter of the Yangtze river in the Wuhan section of 2017 and 2018 as an example: the time period of river water temperature lower than 8 ℃ is about 1 month, and the lowest river water temperature is 4.3 ℃. In order to meet the heat supply requirement of a water source heat pump in winter, the prior art 1, patent publication numbers: the patent of CN106091077A discloses an energy supply system of an ice source heat pump, which provides an ice water mixture preparation device to solve the problem of low-temperature heat extraction in winter, and the device adopts an evaporator to provide a cold source for the ice water mixture preparation device through a medium similar to glycol antifreeze solution to realize low-temperature heat extraction, but the patent does not consider the problem of the energy efficiency ratio reduction of an antifreeze containing glycol solution to a unit, and does not provide a mature scheme of the ice water mixture preparation device, especially a technical scheme of how to deice.

4. The mechanism of icing is:

4.1 principle of icing

The author fan linger in 2 months of 2005 disclosed in the university of avigation university, south jing, academic paper "numerical simulation of icing and thawing process": when the water is frozen, the temperature of the water is firstly reduced to below 0 ℃ to become supercooled water. From a thermodynamic point of view, supercooled water is in a metastable state, the release of which requires the formation of ice nuclei larger than a critical size. There are two mechanisms for ice core formation: homogeneous nucleation within the water body and heterogeneous nucleation at the solid-liquid phase change interface. When ice nuclei with the size larger than the critical size appear in the supercooled water, the icing process starts, the ice nuclei grow rapidly in the supercooled water to finally become ice in a macroscopic sense, and simultaneously heat is released outwards to reduce or eliminate the supercooling degree. The magnitude of the supercooling degree has an important influence on whether the freezing phenomenon occurs. Whether the supercooled water with a certain supercooling degree is frozen or not is influenced by a plurality of factors, wherein the factors may include the flowing state of the water, the geometric characteristics, the physical characteristics, the surface area, the applied acting force and the like of the surface of the frozen matrix. For the non-uniform nucleation icing on the solid-liquid phase change interface, the heat transfer of the pipe wall and the ice layer in the pipe wall is mainly relied on, the icing continues on the surface of the formed ice layer, and the supercooling degree of the icing water is smaller at the moment.

4.2 freezing Process

During the process of continuously reducing the temperature and finally freezing, the water mainly undergoes the following 4 processes:

(1) in the cooling process, liquid water is cooled to the crystallization temperature of 0 ℃, and in the later stage of the process, crystal embryos which are small in size, different in size and extremely unstable are randomly generated and are also sources of crystal nuclei generated in water subsequently;

(2) in the supercooling process, liquid water is cooled to below 0 ℃ to become supercooled water, and certain relatively stable crystal embryos with larger sizes actually grow into crystal nuclei;

(3) dendritic crystal grows, crystal nuclei reach critical dimensions and have edges and corners, and the heat exchange conditions of the crystal nuclei are superior to those of other parts, so that the crystal nuclei grow preferentially, and the growth mode is called dendritic crystal growth. At the moment, because the dendritic crystal grows rapidly, a large amount of heat is released outwards, and the supercooling degree is reduced rapidly;

(4) and (4) forming an ice layer, wherein after a large number of crystal nuclei grow to be in mutual contact, a large-size ice mass or ice layer is formed, and the supercooling degree is reduced to a stable value.

4.3 icing and deicing of heat exchange tube

The icing process of the heat exchange tube, which belongs to the non-uniform nucleation on the solid-liquid phase change interface, is along with the flow of water from the inlet to the outlet and also goes through the 4 processes. For a flooded heat exchanger, the evaporation temperature of a refrigerant outside a heat exchange pipe is lower than the temperature of water in the heat exchange pipe, the freezing capacity of water in the heat exchange pipe is conducted from the refrigerant evaporated outside the heat exchange pipe, the heat exchange pipe is made of a metal material with a high heat conductivity coefficient, the conduction thermal resistance of the pipe wall is small, the temperature of the wall surface of the pipe is low, an ice layer is firstly formed on the pipe wall, circulating water in the pipe actually conducts heat through the pipe wall and the ice layer and conducts heat convection on the surface of the ice layer to obtain the freezing capacity, the ice layer is further supercooled, the thermal resistance of the ice layer is smaller than that of water, and the freezing of the supercooled water is mainly that dendritic ice.

The ice layer formed on the inner wall of the pipe has opposite effects on icing and heat conduction, on one hand, the increase of the ice layer causes the increase of thermal resistance, so that the heat transfer coefficient is reduced; on the other hand, the existence of the ice layer is beneficial to the growth of dendrite and the speed of freezing is accelerated. Therefore, ice formation within the heat exchange tubes takes two forms: firstly, ice clusters are formed in the flowing water due to the existence of supercooled water and flow along with water, and secondly, ice crystals directly grow on the ice layer on the pipe wall and are fixed on the pipe wall. Although part of the ice crystals are broken and separated along with the water flow due to the impact of the water flow, most of the ice crystals are planted on the surface of the ice layer, so that the ice layer is continuously thickened.

Therefore, no matter the ice is frozen outside the pipe or inside the pipe, if the ice can be effectively removed, the ice crystals growing on the ice layer can be timely reduced, and the thickness of the ice layer is kept to be relatively thin and constant (such as 0.1mm thick), so that the thermal resistance of the ice layer in the ice making process is small and relatively stable, the ice making power can be greatly improved, the energy efficiency ratio of the heat pump unit is improved, the valley price electricity is fully utilized, and the economy is improved.

4.4 Ice blockage problem of Ice-Water mixtures

The ice cake and ice crystal float on the upper part of the tube box and are accumulated and crosslinked by adopting a deicing mode, a large block of ice cake is easily formed, and the subsequent conveying pipeline can be blocked possibly.

5. Fouling factor of heat exchanger

Because of the heat exchanger of the water source heat pump unit, the condenser exchanges heat with the water source side when refrigerating in summer, and the evaporator exchanges heat with the water source side when heating in winter; when the water quality on the water source side is poor, dirt of a heat exchanger of the heat pump unit is easily increased and attached to the pipe wall, so that the heat transfer coefficient of the heat exchange pipe is reduced, and the energy efficiency ratio of the heat pump unit is reduced; particularly, the high-efficiency heat exchange tube has large amplitude of heat transfer coefficient reduction caused by tube wall dirt, the amplitude of the reduction is generally 10-15% after 8 hours of operation, 20% after 36 hours of operation and 30% after 160 hours of operation, and the reduction gradually tends to be stable.

In order to remove dirt on the surface of the heat exchange tube, the prior art usually adopts a method of periodic shutdown cleaning, so that not only is the maintenance cost high, but also the operation of the heat pump unit is interrupted.

Disclosure of Invention

The invention aims to provide a flooded heat exchanger capable of deicing and descaling on line under the condition of uninterrupted operation, which can adopt water as a circulating medium under a low-temperature working condition so as to solve the problems of low energy efficiency ratio and water source low-temperature limit of a heat pump unit in winter caused by an antifreezing agent of a glycol aqueous solution when the heat pump unit in the prior art adopts low-temperature working conditions such as ice storage, low-temperature heat extraction, ice source heat extraction and the like, reduce the fouling coefficient of the heat exchanger, and overcome the problems of high maintenance cost, low energy efficiency ratio and easy ice blockage of the prior heat pump unit.

In order to achieve the purpose, the invention provides the following technical scheme: a flooded heat exchanger capable of deicing and descaling online comprises a shell, a water inlet pipe box, a water outlet pipe box, a gear box, an electric linkage device, a mechanical deicing and descaling device, a heat exchange pipe, a pipe plate, a partition plate, a supporting partition plate and a turbulence device, a shell pass inlet pipe and a shell pass outlet pipe are arranged on the shell, a water inlet pipe box and a water outlet pipe box are arranged at the front end part and the rear end part of the shell and are separated by a pipe plate, a gear box is arranged at the front end of the water inlet pipe box, separated by a clapboard, an electric linkage device is arranged in a gear box, a mechanical deicing and descaling device is arranged in a heat exchange tube, the heat exchange tube is arranged in a shell and supported by a supporting clapboard, two ends of the heat exchange tube are respectively fixedly connected with the tube plate, the electric linkage device is connected with the mechanical deicing and descaling device, the turbulence device is arranged in the water outlet tube box, the water outlet pipe box is provided with a water outlet, the water inlet pipe box is provided with a water inlet, and the supporting partition plate equally divides and fixes the heat exchange pipe.

Furthermore, the electric linkage device comprises a first motor, a worm wheel, a connecting rod and an eccentric wheel, wherein an output shaft of the first motor is fixedly connected with a worm shaft, the worm drives the worm wheel to rotate, the worm wheel and the eccentric wheel coaxially rotate, and the eccentric wheel is hinged with the connecting rod.

Furthermore, the mechanical deicing and descaling device comprises a spiral cutter combined shaft, a thrust plate, a thrust shaft, a pushing shaft sleeve and a sealing ring, wherein one end of the spiral cutter combined shaft is fixedly connected with one end of the thrust plate, the other end of the thrust plate is fixedly connected with one end of the thrust shaft, and the other end of the thrust shaft is hinged to the connecting rod.

Further, the spiral knife combined shaft is composed of a shaft body and spiral blades, the spiral blades are spirally arranged on the outer surface of the shaft body, the diameter of the outer circle of the spiral knife combined shaft is smaller than the inner diameter of the heat exchange tube, and the axial length of the spiral knife combined shaft is larger than the length of the heat exchange tube.

Further, the turbulent flow device comprises a paddle, a transmission shaft, a lower bearing, a shaft sleeve, an upper bearing, a bearing seat, a shaft coupling and a second motor, the second motor is connected with the transmission shaft through the shaft coupling, the lower end of the transmission shaft is fixedly connected with the paddle, the transmission shaft is arranged in the shaft sleeve, the upper bearing and the lower bearing are respectively arranged on the transmission shaft at the upper end and the lower end of the shaft sleeve, the upper end of the shaft sleeve is fixedly connected with the bearing seat, and the bearing seat is fixedly arranged on the pipe box.

Furthermore, a rubber sealing ring is arranged between the bearing seat and the water outlet pipe box of the turbulent flow device, and a mechanical sealing device is arranged between the bearing seat and the transmission shaft.

Compared with the prior art, the invention has the beneficial effects that: according to the invention, the mechanical deicing and descaling device is arranged in the heat exchange pipe and axially reciprocates, so that the structures of the deicing and descaling device and the linkage part of the deicing and descaling device are simplified, the continuous reduction and removal of an ice layer and water scale in the heat exchange pipe are realized, the dirt coefficient of the heat exchanger can be reduced, the reliability of the deicing and descaling function in a continuous working state is improved, the efficient heat exchange problems of refrigeration, heating, ice making, low-temperature heat extraction and ice source heat extraction of the heat exchanger of the heat pump unit are finally realized, and the problems of low energy efficiency ratio, high maintenance cost and easiness in ice blockage generation of the conventional heat pump unit are solved.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic structural diagram of a mechanical deicing and descaling device in the invention;

FIG. 3 is a schematic view of a turbulator in the present invention;

FIG. 4 is a diagram of a refrigeration system of a heat pump unit prepared by the present invention;

FIG. 5 is a diagram of a circulating water system of a heat pump unit prepared by the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in figures 1-3, a flooded heat exchanger capable of online deicing and descaling comprises a shell 1, a water inlet pipe box 7, a water outlet pipe box 8, a gear box 30, an electric linkage device 3, a mechanical deicing and descaling device 4, a heat exchange pipe 2, a pipe plate 21, a partition plate 10, a supporting partition plate 5 and a turbulence device 6, wherein the shell 1 is provided with a shell pass inlet pipe 11 and a shell pass outlet pipe 12, the water inlet pipe box 7 and the water outlet pipe box 8 are arranged at the front end and the rear end of the shell 1 and are separated by the pipe plate 21, the gear box 30 is arranged at the front end of the water inlet pipe box 7 and is separated by the partition plate 10, the electric linkage device 3 is arranged in the gear box 30, the mechanical deicing and descaling device 4 is arranged in the heat exchange pipe 2, the heat exchange pipe 2 and the supporting partition plate 5 are arranged in the shell 1, the left end and the right, the turbulent device 6 is arranged in the water outlet pipe box 8, the water outlet pipe box 8 is provided with a pipe box outlet 81, the water inlet pipe box 7 is provided with a pipe box inlet 71, and the support partition plate 5 uniformly divides the fixed support heat exchange pipe 2.

The electric linkage device 3 comprises a first motor 31, a worm 32, a worm wheel 33, a connecting rod 34 and an eccentric wheel 35, wherein an output shaft of the first motor 31 is fixedly connected with the worm 32, the worm 32 drives the worm wheel 33 to rotate, the worm wheel 33 and the eccentric wheel 35 coaxially rotate, and the eccentric wheel 35 is hinged with the connecting rod 34.

The mechanical deicing and descaling device 4 comprises a spiral knife combined shaft 41, a thrust plate 42, a thrust shaft 43, a pushing shaft sleeve 44 and a sealing ring 45, wherein one end of the spiral knife combined shaft 41 is fixedly connected with one end of the thrust plate 42, the other end of the thrust plate 42 is fixedly connected with one end of the thrust shaft 43, and the other end of the thrust shaft 43 is hinged with the connecting rod 34.

The spiral cutter combined shaft 41 is composed of a shaft body and spiral blades, the spiral blades are spirally arranged on the outer surface of the shaft body, the diameter of the outer circle of the spiral cutter combined shaft 41 is smaller than the inner diameter of the heat exchange tube 2, and the axial length of the spiral cutter combined shaft 41 is larger than the length of the heat exchange tube 2.

In the invention, the worm 32 is coaxially driven by the first motor 31 to rotate, the worm 32 drives the worm wheel 33 to rotate, speed change is realized, the worm wheel 33 drives the eccentric wheel 35 to rotate, the eccentric wheel 35 drives one end of the connecting rod 34 to rotate, the other end of the connecting rod 34 drives the thrust shaft 43 to axially reciprocate, the thrust shaft 43 drives the thrust plate 42 and the spiral knife combination shaft 41 to axially reciprocate together, so that the spiral knife combination shaft 41 and the inner wall of the heat exchange tube 2 do reciprocating relative motion, the cutting and cleaning of ice layers or dirt on the inner wall of the heat exchange tube 2 are realized, the reciprocating motion stroke of the reciprocating motion is larger than the distance between adjacent spiral blades, newly-generated ice layers or dirt layers on the inner wall of the heat exchange tube 2 are effectively cut off, the thickness of the ice layers is kept stable, and the cut ice chips or dirt chips are taken out of the heat exchange tube 2 along with circulating.

The turbulent device 6 comprises a blade 61, a transmission shaft 62, a lower bearing 63, a shaft sleeve 64, an upper bearing 66, a bearing seat 67, a shaft coupling 68 and a second motor 69, wherein the second motor 69 is connected with the transmission shaft 62 through the shaft coupling 68, the lower end part of the transmission shaft 62 is fixedly connected with the blade 61, the transmission shaft 62 is arranged in the shaft sleeve 64, the upper bearing 66 and the lower bearing 63 are respectively arranged on the transmission shaft 62 at the upper end part and the lower end part of the shaft sleeve 64, the upper end part of the shaft sleeve 64 is fixedly connected with the bearing seat 67, and the bearing seat 67 is fixedly arranged on the. A rubber sealing ring is arranged between the bearing seat 67 and the water outlet pipe box 8, a mechanical sealing device 65 is arranged between the bearing seat 67 and the transmission shaft 62, and the mechanical sealing device 65 in the present application is a shaft sealing device of a rotating machine, which is a sealing device known by those skilled in the art and will not be summarized in detail.

The turbulence device 6 is opened when preparing the ice-water mixture, and the ice-water mixture in the water outlet pipe box 8 is disturbed by the paddle 61, so that the internal circulation speed of the water outlet pipe box 8 is increased, the increase of the ice crystal crosslinking degree in the ice-water mixture is inhibited, the ice cluster size is reduced, and the ice blockage phenomenon of a subsequent pipeline is prevented.

When the invention is used as an evaporator for preparing ice-water mixture, a turbulent flow device 6 is arranged in the water outlet pipe box 8; when the ice making heat exchanger is used as a non-ice making heat exchanger, the turbulent device 6 is not arranged or started in the water outlet pipe box 8.

The heat exchanger provided by the invention has the online deicing or descaling function on the inner wall of the heat exchange tube, the heat exchange tube 2 can adopt a high-efficiency heat exchange tube, the heat transfer coefficient of the heat exchange tube is superior to that of a flooded heat exchanger in the prior art, and the high-efficiency heat exchange can be continuously maintained; in the heat pump unit, the evaporator is used as a flooded evaporator, normal refrigeration, ice making and cold storage and low-temperature heat extraction can be realized, and when the evaporator is used as a flooded condenser, the fouling coefficient is small, and high-efficiency heat exchange can be realized.

Example 1

As shown in fig. 4, the heat pump unit 9 comprises an evaporator 93, a condenser 91, a compressor 92 and an expansion valve 94, and the composition form and the working principle of the heat pump unit are the same as those of a conventional heat pump unit, when the heat exchanger provided by the invention is used as the evaporator 93, the evaporation temperature of the refrigerant of the heat pump unit is not limited by low temperature, the heat pump unit can directly refrigerate or prepare ice water mixture for cold storage in summer, and can directly exchange heat in a low-temperature water source in winter to extract sensible heat or latent heat of the water source, so that the heat pump unit is suitable for various working conditions such as normal cold supply, ice cold storage, heat supply, low-temperature heat extraction, ice source heat extraction and the like, and the application range can be expanded to.

As shown in fig. 5, which is a diagram of a heat pump unit circulating water system obtained when the evaporator 93 is prepared by the present invention, the heat pump unit 9 prepared according to fig. 4 needs a water storage tank and a circulating water pump in addition to the heat pump unit 9 when ice making and cold storage are performed in summer; can store ice and release cold in summer. When cooling is supplied or ice is made for cold storage in summer, cooling water of a condenser of the heat pump unit circularly radiates heat to a water source side through the

valves

109 and 1010 and the pump 100; the chilled water of the heat exchanger 93 is supplied to the building side through

valves

106, 108 and 1011 and a pump 1019; the ice-water mixture prepared by the heat exchanger 93 is stored cold to the water storage tank 102 through the

valves

1013 and 1014 and the pump 1018. The cold water from the storage tank 102 is passed through valves 1012, 1015 and pump 1018 to release cold to the cold supply pipe.

During heating in winter, the valve is switched, the chilled water or the ice-water mixture of the heat exchanger 93 is prepared by the invention, sensible heat or latent heat is exchanged from the water source side through the circulation of the

valves

105, 107 and 1011 and the pump 100, and heat is supplied to the building side through the condenser of the heat pump unit 9.

The flooded heat exchanger prepared by the invention can achieve the following positive effects:

1) the comprehensive energy efficiency ratio of ice making and cold storage of the heat pump unit can be relatively improved by 15-28%;

2) the invention adopts the refrigerant to directly produce ice, store cold and take heat at low temperature, avoids the harm caused by using the intermediate secondary refrigerant, reduces toxic emission and environmental pollution and prolongs the service life of equipment;

3) the invention is a summer ice-making cold-storage device which is used as a winter low-temperature heat-taking and ice-source heat-taking device, solves the problem of winter low-temperature heat-taking, and the applicability of the heat pump unit combined with the device can be expanded to heat supply and cold supply of global water areas, thereby avoiding the use of winter auxiliary heat sources, reducing the equipment investment, greatly reducing the energy consumption and environmental pollution, reducing the operation cost and improving the economy.

The worm in the electric linkage device of the invention covers the small gear and the worm wheel covers the large gear, and the speed change of the worm wheel and the worm covers the speed change of the small gear and the large gear and the multi-stage gear speed change mode thereof.

In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "both ends", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "disposed," "connected," "secured," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.

Claims

1. The utility model provides a can online deicing, full liquid formula heat exchanger of scale removal which characterized in that: comprises a shell (1), a water inlet pipe box (7), a water outlet pipe box (8), a gear box (30), an electric linkage device (3), a mechanical deicing and descaling device (4), a heat exchange pipe (2), a pipe plate (21), a partition plate (10), a supporting partition plate (5) and a turbulence device (6), wherein the shell pass inlet pipe (11) and the shell pass outlet pipe (12) are arranged on the shell (1), the water inlet pipe box (7) and the water outlet pipe box (8) are arranged at the front end part and the rear end part of the shell (1) and are separated by the pipe plate (21), the gear box (30) is arranged at the front end of the water inlet pipe box (7) and is separated by the partition plate (10), the electric linkage device (3) is arranged in the gear box (30), the mechanical deicing device (4) is arranged in the heat exchange pipe (2), the heat exchange pipe (2) and the supporting partition plate (5) are arranged in, both ends and tube sheet (21) fixed connection about heat exchange tube (2), electronic aggregate unit (3) are connected with mechanical deicing scale removal device (4), turbulent flow device (6) are installed in outlet pipe case (8), be equipped with pipe case export (81) on outlet pipe case (8), install a pipe case import (71) on inlet pipe case (7), support baffle (5) are equallyd divide fixed and support heat exchange tube (2).

2. The flooded heat exchanger capable of online deicing and descaling according to claim 1, wherein: the electric linkage device (3) comprises a first motor (31), a worm (32), a worm wheel (33), a connecting rod (34) and an eccentric wheel (35), an output shaft of the first motor (31) is fixedly connected with the worm (32), the worm (32) drives the worm wheel (33) to rotate, the worm wheel (33) and the eccentric wheel (35) rotate coaxially, and the eccentric wheel (35) is hinged to the connecting rod (34).

3. The flooded heat exchanger capable of online deicing and descaling according to claim 1, wherein: the mechanical deicing and descaling device (4) comprises a spiral knife combined shaft (41), a thrust plate (42), a thrust shaft (43), a thrust shaft sleeve (44) and a sealing ring (45), wherein one end of the spiral knife combined shaft (41) is fixedly connected with one end of the thrust plate (42), the other end of the thrust plate (42) is fixedly connected with one end of the thrust shaft (43), and the other end of the thrust shaft (43) is hinged to a connecting rod (34).

4. The flooded heat exchanger capable of online deicing and descaling as claimed in claim 3, wherein: the spiral cutter combined shaft (41) is composed of a shaft body and spiral blades, the spiral blades are spirally arranged on the outer surface of the shaft body, the diameter of the outer circle of the spiral cutter combined shaft (41) is smaller than the inner diameter of the heat exchange tube (2), and the axial length of the spiral cutter combined shaft (41) is larger than the length of the heat exchange tube (2).

5. The flooded heat exchanger capable of online deicing and descaling according to claim 1, wherein: the turbulent flow device (6) comprises a paddle (61), a transmission shaft (62), a lower bearing (63), a shaft sleeve (64), an upper bearing (66), a bearing seat (67), a coupling (68) and a second motor (69), wherein the second motor (69) is connected with the transmission shaft (62) through the coupling (68), the lower end part of the transmission shaft (62) is fixedly connected with the paddle (61), the transmission shaft (62) is installed in the shaft sleeve (64), the upper bearing (66) and the lower bearing (63) are respectively arranged on the transmission shaft (62) at the upper end part and the lower end part of the shaft sleeve (64), the upper end part of the shaft sleeve (64) is fixedly connected with the bearing seat (67), and the bearing seat (67) is fixedly installed on the water outlet pipe box (8).

6. The flooded heat exchanger capable of online deicing and descaling according to claim 5, wherein: a rubber sealing ring is arranged between the bearing seat (67) and the outlet pipe box (8), and a mechanical sealing device (65) is arranged between the bearing seat (67) and the transmission shaft (62).