CN211451457U

CN211451457U - Heat pump set's refrigeration heating system

Info

Publication number: CN211451457U
Application number: CN201922258588.1U
Authority: CN
Inventors: 季能平; 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: 2020-09-08
Anticipated expiration: 2029-12-16

Abstract

The utility model discloses a heat pump set's refrigeration heating system belongs to the refrigerating system field for the building, including condenser, compressor, first evaporimeter and ice-storage evaporimeter, ice-storage evaporimeter and the parallelly connected setting of first evaporimeter, install first expansion valve and second expansion valve respectively in the import of first evaporimeter and the import of ice-storage evaporimeter, the control valve is installed in the export of first evaporimeter, converges into the compressor with the export of ice-storage evaporimeter, the utility model discloses a system ice cold-storage device in summer uses as winter low temperature heat extraction device concurrently, solves winter low temperature and gets the heat problem, has avoided auxiliary heat source's use, has reduced equipment input, has reduced energy consumption and environmental pollution by a wide margin, reduces running cost, improves the economic nature.

Description

Heat pump set's refrigeration heating system

Technical Field

The utility model relates to a refrigerating system field for the building, concretely relates to heat pump set's refrigeration heating system.

Background

1. Summer ice cold accumulation

The cold accumulation air conditioner utilizes the night valley price electricity to refrigerate and accumulate cold, releases the stored cold in the daytime, reduces the electricity load and the electricity consumption of the air conditioner during 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 7-8 times that of the ice cold storage pool on the premise of the same cold storage amount. Although the refrigeration energy efficiency ratio (EER is approximately equal to 5.0) of water cold accumulation is high, in view of the limitation of factors such as building area, engineering cost and the like, an ice cold accumulation mode is usually adopted for cold accumulation in engineering so as to improve the cold accumulation amount and reduce the operation cost.

When ice storage is selected, the refrigerating energy efficiency ratio of the unit is improved, which is a technical problem to be solved at present.

The conventional ice cold storage mainly adopts glycol-containing anti-freezing liquid as secondary refrigerant, obtains circulating fluid with the temperature lower than 0 ℃ from an evaporator of a heat pump unit, and leads the circulating fluid into an ice storage coil pipe to refrigerate and freeze water in an ice storage tank and store the water on the coil pipe. And in the daytime peak electricity period, the stored ice is melted and is supplied with cold.

Prior art 1: the patent application number is CN201621088947.3, discloses a double-evaporator water chilling unit, including condenser, compressor, oil tank, first evaporimeter, second evaporimeter, ejector subassembly etc. and constitute. In the double-evaporator water chilling unit, a first evaporator and a second evaporator are respectively used as a refrigeration evaporator and an ice-making cold-storage evaporator, wherein: the freezing medium in the inlet and outlet pipeline of the first evaporator is water, and the inlet and outlet pipeline of the second evaporator is antifreeze liquid containing glycol.

The technology disclosed above represents a typical technology of a refrigeration and ice-making cold storage dual-working condition heat pump unit, and low-temperature liquid below minus 5.6 ℃ is prepared from a second evaporator of the heat pump unit by depending on anti-freezing liquid containing glycol, and is introduced into an ice storage tray pipe to exchange heat with water outside the pipe, so that ice-making cold storage is realized. When cold accumulation and ice making are carried out, the temperature of the anti-freezing liquid containing glycol returning to the second evaporator is about-2.8 ℃, the temperature is calculated according to the heat transfer temperature difference of the second evaporator of 5 ℃, at the moment, the evaporation temperature of a refrigerant in the second evaporator is about-9.3 ℃, if the condensation temperature of the heat pump unit is 38 ℃, the refrigeration energy efficiency ratio EER is about 3.2 calculated according to the unit efficiency of 73 percent, and the refrigeration energy efficiency ratio EER is about 37 percent lower than that of a unit for water cold accumulation under the same working condition. Because the ethylene glycol-containing cold-carrying liquid is adopted, a circulating pump of the cold-carrying liquid is required to be arranged during ice making, and in addition, the pumping power consumption is increased to account for about 7% of the power consumption of the unit; if the ice storage coil is placed in a water tank or a water tank without bearing pressure, heat exchange needs to be carried out for the cold supply pipeline through the plate during cold release, and secondary pumping power consumption is increased to about 7% of the power consumption of the unit, so that the integrated energy efficiency ratio EERb (about EERb 2.6-2.8) of ice making, cold storage and cold release in the ice storage mode in the prior art 1 is only about 52-58% of the refrigeration energy efficiency ratio of the unit with water cold storage.

2. Direct ice making and cold storage by refrigerant

Prior art 2: the authorization notice number is: the patent of CN2606284Y discloses a direct evaporation type cold accumulation air conditioner, belonging to the technical field of cold accumulation air conditioners. The air conditioner consists of an outdoor unit consisting of a compressor, an air-cooled heat exchanger, a high-pressure liquid reservoir, a throttling mechanism, a gas-liquid separator, an external ice melting and storing tank and a coil heat exchanger, and an air conditioner water loop consisting of an air conditioner tail end and a water pump. According to different states of the compressor and the water pump, four operation modes of ice storage of the cold machine, ice melting and cold supply of the ice tank, cold machine and ice tank side storage and cold supply of the cold machine and cold machine cold supply are provided. The device effectively overcomes the defects of frequent start/stop, poor quick response of an air conditioning system, complex structure and the like of the conventional air-cooled water chilling unit under low air conditioning load, and directly cools the air conditioning system from the ice storage tank without starting a compressor in the cooling process, thereby saving a secondary heat exchange link, reducing adjusting valves, reducing the cost and the operating cost of the device and improving the reliability of the device; has important significance for promoting the miniaturization of cold accumulation air conditioning equipment and the large-scale 'peak load shifting' of an electric power system.

The external ice melting and storage tank of the technical scheme is used as an evaporator of a water chilling unit in summer, and the direct evaporation refrigeration and ice making and storage by using a refrigerant are great improvements on the ice making and storage heat pump unit.

Prior art 3: the authorization notice number is: the patent of CN104930740B discloses a double-evaporator refrigeration ice-making system, which comprises a refrigeration compressor, an oil separator, a condenser, a second evaporator, an ice-making evaporator, a low-pressure circulation barrel, an oil-return ejector pump and a refrigerant liquid-supply pump;

in the prior art 3, a plate type heat exchanger is adopted, and a non-positive displacement structure is adopted, so that only ice can be made, and cold cannot be stored; because the plate-type ice-making evaporator can not work continuously, high-temperature gas is needed to melt and de-ice. Its cold quantity loss is large, and its refrigerating capacity is lower.

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 of the heat pump unit evaporator, a flooded evaporator is usually selected. The flooded evaporator is an evaporator in which the medium outside the heat exchange tube (shell pass) is refrigerant 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 lower than the 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 low-temperature water source heat pump in winter, the prior art 4, patent publication No. CN106091077A, discloses an ice source heat pump energy supply system, which comprises an ice water mixture preparation device and a condenser; the ice source heat pump in the patent can utilize the phase change latent heat of surface water such as rivers, lakes and seas, underground water, urban reclaimed water, sewage and water stored in buildings as a low-temperature heat source of the heat pump to provide domestic hot water, a heat source for heating and a cold source for cooling for users. The problem of winter surface water temperature is low excessively easily causes the icing of conventional heat pump set evaporimeter and unable the use is solved. The heat pump can greatly reduce the amount of low-temperature heat source water required by heat supply of the heat pump in winter, protect the environment, realize the supply of domestic hot water and heating in winter by utilizing outdoor low-temperature water source with near freezing point, and save energy.

The prior art 4 provides a good concept, that is, the ice-water mixture preparation device is adopted, so that the problem of low-temperature heat extraction in winter can be solved, the working principle and the form of a heat pump unit are similar to those of the prior art 1, and an evaporator is also adopted to provide a cold source for the ice-water mixture preparation device through a medium similar to glycol antifreeze liquid, so that low-temperature heat extraction is realized.

4. Ice making cold storage and low temperature heat taking characteristics

The ice making and cold storage working condition and the low temperature heat taking working condition have the common point that evaporation and heat exchange are carried out, and the ice making and cold storage working condition and the low temperature heat taking working condition need to work under the low temperature working condition of 0 ℃ or below, and can be used as a shared device as long as the structure of the device is reasonable; but the two are different in that:

1) when the heat exchanger works, the temperature in the heat exchange tubes is different, the thermal resistance outside the tubes is gradually increased along with the gradual increase of the ice thickness during ice making and cold storage, the heat transfer temperature difference is gradually increased, and the temperature in the tubes is gradually reduced; when the heat is taken at low temperature, the temperature in the pipe is relatively stable because the temperature of the water source is relatively stable; the evaporation temperature of the device can be automatically adjusted through a decompression expansion valve of the unit, so that ice making and cold storage or low-temperature heat extraction are realized.

2) The flow state outside the pipe is different, the water outside the pipe can be static when ice making and cold storage, and the water outside the pipe needs a certain water flow speed when heat is taken at low temperature, so that the corresponding heat transfer coefficient is kept.

5. Damage of glycol antifreezing solution

In the prior art of heat pumps, an antifreeze containing glycol is usually selected as an intermediate secondary refrigerant, so that the low-temperature working condition is adapted to realize ice making and cold storage or low-temperature heat extraction; because the antifreeze containing glycol is oxidized to form oxalic acid (oxalic acid) after contacting with air, the corrosion to stainless steel materials is high, but the corrosion to carbon steel materials is low, the conventional ice storage coil pipe is made of carbon steel materials, and the pitting and perforation years are about 8-10 years for steel pipes with the wall thickness of 2mm, so the service life is short. 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.

Most of the prior art provides technical schemes for solving single working conditions of a heat pump unit, and application technologies which are suitable for full-flow working conditions such as refrigeration, ice making and cold storage in summer, heating in winter, low-temperature heat taking working conditions and the like and have relatively high energy efficiency ratio of the heat pump unit are lacked, and further implementation schemes with strong operability for improving the energy efficiency ratio of the full working conditions are lacked.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a have heat pump set's of cooling, heat supply mode refrigeration heating system concurrently to solve the problem that mentions in the background art.

In order to achieve the above object, the utility model provides a following technical scheme: a refrigeration and heat supply system of a heat pump unit comprises a condenser, a compressor, a first evaporator and an ice storage evaporator, wherein the ice storage evaporator and the first evaporator are arranged in parallel, a first expansion valve and a second expansion valve are respectively arranged on an inlet of the first evaporator and an inlet of the ice storage evaporator, a control valve is arranged at an outlet of the first evaporator, and an outlet of the control valve and an outlet of the ice storage evaporator are connected in parallel and converge into the compressor;

the ice storage evaporator comprises a shell, a shell side water inlet pipe, a shell side water outlet pipe, a heat exchange pipe, a support plate, a shell side internal circulation device, a pipe side water outlet pipe, a pipe side water inlet pipe, a pipe side outlet pipe box, a pipe side inlet pipe box, a center support pipe, an upper pipe plate and a lower pipe plate, wherein the heat exchange pipe is arranged in the shell, the center of the heat exchange pipe bundle is provided with the center support pipe, the shell side internal circulation device is arranged in the center support pipe, the support plate is arranged outside the center support pipe, the heat exchange pipe bundle is spirally wound and fixed through the support plate, the upper end part and the lower end part of the center support pipe are respectively provided with the upper pipe plate and the lower pipe plate, the upper pipe plate and the lower pipe plate are respectively welded with the heat exchange pipe, the center support pipe and the shell, the shell side water inlet pipe and the, and a tube pass outlet tube box and a tube pass water outlet pipe are arranged on the outer side of the lower tube plate.

Further, the shell side internal circulation device comprises a motor, a coupler, a bearing sleeve, an upper bearing, a bearing seat, a mechanical sealing device, a transmission shaft, a support sleeve, a fairing, an axial flow paddle, a motor base, a sealing ring and a lower shaft sleeve, wherein the motor is arranged on the motor base, an output shaft of the motor is connected with one side of the transmission shaft through the coupler, and the other side of the transmission shaft is connected with the axial flow paddle.

Further, an upper bearing and a lower bearing are respectively installed at two ends of the transmission shaft, the upper bearing is installed in the bearing seat and the bearing sleeve, the lower bearing is installed in the inner wall of the end part of the supporting sleeve, a flange is arranged at the upper end part of the supporting sleeve and connected with a flange at the end part of the central supporting tube, the lower end of the supporting sleeve is arranged in the fairing, the fairing is arranged in a flow channel of the central supporting tube and located behind the flow direction of the axial flow paddle blade, the fairing is provided with an outer tube and an inner tube, and an axial fairing blade plate is arranged between the outer tube and the inner tube in the circumferential direction.

Furthermore, through holes are respectively formed in the central supporting tubes in front of and behind the axial flow blades and communicated with the shell pass.

Furthermore, a mechanical sealing device is installed at the position, where the transmission shaft penetrates out of the bearing seat at the end part of the supporting sleeve, and a sealing ring is arranged between the end flange of the supporting sleeve and the end flange of the central supporting tube.

Further, the backup pad includes inlayer pipe backup pad and outer pipe backup pad, the backup pad is the S type structure, inlayer pipe backup pad and outer pipe backup pad are "[" structure, inlayer pipe backup pad welds with the one end of outer pipe backup pad, forms the backup pad of S type structure, the side of inlayer pipe backup pad and outer pipe backup pad is evenly seted up flutedly, the recess is used for placing the heat exchange tube.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a with the system ice cold-storage device in summer use as winter low temperature concurrently and get hot device, solve winter low temperature and get hot problem, avoided the use of auxiliary heat source, reduced equipment input, reduced energy resource consumption and environmental pollution by a wide margin, reduce running cost, improve the economic nature.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of an ice storage evaporator according to the present invention;

fig. 3 is a schematic structural view of a shell-side internal circulation device in the present invention;

fig. 4 is a schematic structural diagram of the support plate of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1-4, a refrigeration and heating system of a heat pump unit includes a condenser 14, a compressor 15, a control valve 16, a first evaporator 17 and an ice storage evaporator 18, the ice storage evaporator 18 is disposed in parallel with the first evaporator 17, a first expansion valve 19 and a second expansion valve 191 are respectively installed on an inlet 171 of the first evaporator and an inlet 181 of the ice storage evaporator, the control valve 16 is installed on an outlet 172 of the first evaporator, and an outlet 182 of the control valve 16 and an outlet 182 of the ice storage evaporator are connected in parallel and merged into the compressor; the utility model discloses an adopt specific ice-storage evaporimeter 18 for the heat pump set that the preparation obtained can have the efficiency of refrigeration and heat supply simultaneously, can directly refrigerate or make the ice cold-storage summer, can get heat in low temperature water source or sewage source winter, external heat supply.

An ice storage evaporator 18 comprises a shell 12, a shell side water inlet pipe 10, a shell side water outlet pipe 13, heat exchange pipes 11, a support plate 5, a shell side internal circulation device 4, a pipe side water outlet pipe 2, a pipe side water inlet pipe 9, a pipe side outlet pipe box 8, a pipe side inlet pipe box 1, a central support pipe 6, an upper pipe plate 3 and a lower pipe plate 7, wherein the heat exchange pipes 11 are arranged at the inner end part of the shell 12, the shell side internal circulation device 4 is arranged in the central support pipe 6, the support plate 5 is arranged at the outer end part of the central support pipe 6, the pipe bundle of the heat exchange pipes 11 is spirally wound and is fixed through the support plate 5, the upper pipe plate 3 and the lower pipe plate 7 are respectively arranged at the upper end part and the lower end part of the central support pipe 6, the shell 12 are respectively welded with the heat exchange pipes 11, the central support pipe 6 and the shell 12, the shell side water inlet pipe 10 and the, and a tube pass outlet tube box 8 and a tube pass water outlet tube 2 are arranged on the outer side of the lower tube plate 7. The medium in the heat exchange tube 11 is a refrigerant, the medium outside the heat exchange tube 11 is water, and when the temperature of the refrigerant in the spiral heat exchange tube 11 is lower than 0 ℃, the refrigerant can be evaporated and exchanged with the water outside the heat exchange tube 11, so that the freezing cold accumulation or low-temperature heat extraction is realized.

The shell side internal circulation device 4 comprises a motor 41, a coupler 42, a bearing sleeve 43, an upper bearing 44, a bearing seat 45, a mechanical sealing device 46, a transmission shaft 47, a support sleeve 48, a fairing 49, an axial flow paddle 410, a motor base 411, a sealing ring 412 and a lower shaft sleeve, wherein the motor 41 is arranged on the motor base 411, an output shaft of the motor 41 is connected with one side of the transmission shaft 47 through the coupler 42, and the other side of the transmission shaft 47 is connected with the axial flow paddle 410.

An upper bearing 44 and a lower bearing 413 are respectively installed at two ends of a transmission shaft 47, the upper bearing 44 is installed in a bearing seat 45 and a bearing sleeve 43, the lower bearing 413 is installed in the inner wall of the end part of a support sleeve 48, the upper end part of the support sleeve 48 is in flange welding with the upper end part of a central support pipe 6, the lower end of the support sleeve 48 is arranged in a fairing 49, the fairing 49 is installed in a flow channel of the central support pipe 6, the fairing 49 is located at the front end part of an axial flow blade 410, an outer pipe and an inner pipe are arranged in the fairing 49, and an axial fairing blade plate is arranged between the outer pipe and.

The central support tube 6 at the front and the back of the axial flow blade 410 is respectively provided with a through hole 414 which is communicated with the shell pass.

The mechanical sealing device 46 is mounted on the bearing seat 45 of the end portion of the transmission shaft 47 penetrating through the central support tube 6, a sealing ring 412 is disposed between the end flange of the support sleeve 48 and the end flange of the central support tube 6, and the mechanical sealing device 46 in the present application is a rotary mechanical shaft sealing device, which is well known to those skilled in the art and will not be summarized in detail herein.

The support plate 5 comprises an inner layer pipe support plate 51 and an outer layer pipe support plate 52, the support plate 5 is of a continuous S-shaped structure, the inner layer pipe support plate 51 and the outer layer pipe support plate 52 are of a [ -shaped structure, the inner layer pipe support plate 51 is welded with one end of the outer layer pipe support plate 52 to form the support plate 5 of the S-shaped structure, grooves 53 are uniformly formed in the side edges of the inner layer pipe support plate 51 and the outer layer pipe support plate 52, and the grooves 53 are used for placing the heat exchange pipes 11. Through the arrangement of the supporting plate 5 structure, the ice storage space is reserved between the adjacent spiral heat exchange tubes, so that the requirement of ice storage capacity in a valley price electricity period is met.

The specific cooling and heating modes are as follows:

1) ice making and cold storage: the compressor 15 and the second expansion valve 191 are opened, the first expansion valve 19 is closed, the control valve 16 is closed, the ice storage evaporator 18 is operated, and ice making and cold storage or low-temperature heat extraction are performed. At this time, the water inlet 171 of the first evaporator should be sealed off to prevent the first evaporator 17 from freezing and damaging.

2) Refrigeration, cold release and cold supply: the compressor 15, the first expansion valve 19 and the control valve 16 are opened, the second expansion valve 191 is closed, the first evaporator 17 is cooled and supplied with cold, at this time, the ice storage evaporator 18 is still cooled, and an ice layer still exists outside the heat exchange pipe of the ice storage evaporator 18, so that the ice storage evaporator is not suitable for being used as a cooling evaporator.

3) Single cold release and cold supply: the compressor 15 is stopped, the control valve 16 is opened, the first expansion valve 19 and the second expansion valve 191 are closed, and the first evaporator 17 and the ice-storage evaporator 18 are stopped. At this time, the ice-storage evaporator 18 supplies cooling to the outside.

4) Refrigerating and cooling by a unit: after the ice-storage evaporator 18 finishes releasing the cold, the compressor 15, the first expansion valve 19 and the second expansion valve 191 are opened, the control valve 16 is opened and the pressure behind the valves is adjusted, so that the first evaporator 17 and the ice-storage evaporator 18 can simultaneously operate for cooling. At this time, the ice layer of the ice storage evaporator 18 outside the heat exchange pipe is completely melted, can be used as a refrigeration evaporator, and can work with the first evaporator 17 at the same time, so that the evaporation and heat exchange area of the heat pump unit can be increased, the heat transfer temperature difference is reduced, the evaporation temperature is increased, and the energy efficiency ratio of the heat pump unit is improved.

5) Normal heat supply: when the temperature of the water source is higher than 9 ℃ for supplying heat, the compressor 15, the first expansion valve 19 and the second expansion valve 191 can be simultaneously opened, the control valve 16 is opened and the pressure behind the valves is adjusted, so that the first evaporator 17 and the ice storage evaporator 18 can simultaneously evaporate and take heat. At the moment, the evaporation and heat exchange area of the heat pump unit can be increased, so that the heat transfer temperature difference is reduced, the evaporation temperature is increased, and the energy efficiency ratio of the heat pump unit is improved.

6) Low-temperature heat extraction: when the temperature of the water source is lower than 9 ℃ for heat supply, the compressor 15 and the second expansion valve 191 are opened, the first expansion valve 19 is closed, and the control valve 16 is closed, so that the ice storage evaporator 18 works independently and heat is taken at low temperature. At this time, the water outlet 172 of the first evaporator is sealed and closed, preventing the first evaporator 17 from being damaged by freezing.

7) When the water source quality is poor (such as sewage) to supply heat, the compressor 15 and the second expansion valve 191 are opened, the first expansion valve 19 is closed, and the control valve 16 is closed, so that the ice storage evaporator 18 works independently to evaporate and supply heat. At this time, the water outlet 172 of the first evaporator is closed, preventing the first evaporator 17 from being contaminated by the contaminated water.

Through the utility model provides an ice-storage evaporator 18 can gain following positive effect:

1) the comprehensive energy efficiency ratio of the heat pump unit can be relatively improved by 15-28%, and the details are shown in tables 1 and 2.

TABLE 1

TABLE 2

2) The utility model discloses a direct system ice cold-storage of refrigerant and low temperature get heat, avoided harm such as the efficiency that middle secondary refrigerant brought is low and corruption, reduced poisonous emission and environmental pollution, increased the life of equipment.

3) The utility model discloses a with the system ice cold-storage device in summer use as winter low temperature concurrently and get hot device, solve winter low temperature and get hot problem, avoided the use of auxiliary heat source, reduced equipment input, reduced energy resource consumption and environmental pollution by a wide margin, reduce running cost, improve the economic nature.

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 the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "disposed," "connected," "fixed," "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; they may be directly connected or indirectly connected through an intermediate medium, and may be connected through the inside of two elements or in an interaction relationship between two elements, unless otherwise specifically defined, and the specific meaning of the above 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 the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is to be accorded the full scope of the claims.

Claims

1. The utility model provides a heat pump set's refrigeration heating system which characterized in that: the system comprises a condenser (14), a compressor (15), a control valve (16), a first evaporator (17) and an ice storage evaporator (18), wherein the ice storage evaporator (18) is connected with the first evaporator (17) in parallel, a first expansion valve (19) and a second expansion valve (191) are respectively installed on an inlet (171) of the first evaporator and an inlet (181) of the ice storage evaporator, the control valve (16) is installed on an outlet (172) of the first evaporator, and a pipeline which is connected with an outlet (182) of the ice storage evaporator in parallel is communicated with an inlet of the compressor;

the ice storage evaporator (18) comprises a shell (12), a shell side water inlet pipe (10), a shell side water outlet pipe (13), a heat exchange pipe (11), a support plate (5), a shell side internal circulation device (4), a tube side water outlet pipe (2), a tube side water inlet pipe (9), a tube side outlet pipe box (8), a tube side inlet pipe box (1), a center support pipe (6), an upper pipe plate (3) and a lower pipe plate (7), wherein the heat exchange pipe (11) is installed in the shell (12), the center support pipe (6) is installed at the center of the heat exchange pipe (11) pipe bundle, the shell side internal circulation device (4) is installed in the center support pipe (6), the support plate pipe bundle (5) is installed outside the center support pipe (6), the heat exchange pipe (11) is spirally wound and fixed through the support plate (5), the upper end part and the lower end part of the center support pipe (6) are respectively provided with the upper pipe plate (, go up tube sheet (3), lower tube sheet (7) and weld with heat exchange tube (11), center support tube (6), casing (12) respectively, shell side inlet tube (10) and shell side outlet pipe (13) are installed respectively to both ends about casing (12), it is provided with tube side import pipe case (1) and tube side inlet tube (9) to go up tube sheet (3) outside, lower tube sheet (7) outside is provided with tube side export pipe case (8) and tube side outlet pipe (2).

2. A refrigeration and heating system of a heat pump unit according to claim 1, wherein: the shell side internal circulation device (4) comprises a motor (41), a coupler (42), a bearing sleeve (43), an upper bearing (44), a bearing seat (45), a mechanical sealing device (46), a transmission shaft (47), a supporting sleeve (48), a fairing (49), an axial flow paddle (410), a motor base (411), a sealing ring (412) and a lower shaft sleeve, wherein the motor (41) is installed on the motor base (411), an output shaft of the motor (41) is connected with one side of the transmission shaft (47) through the coupler (42), and the other side of the transmission shaft (47) is connected with the axial flow paddle (410).

3. A refrigeration and heating system of a heat pump unit according to claim 2, wherein: an upper bearing (44) and a lower bearing (413) are respectively installed at two ends of the transmission shaft (47), the upper bearing (44) is installed in a bearing seat (45) and a bearing sleeve (43), the lower bearing (413) is installed in the inner wall of the end part of the supporting sleeve (48), a flange is arranged at the upper end part of the supporting sleeve (48) and is connected with a flange at the end part of the central supporting pipe (6), the lower end of the supporting sleeve (48) is arranged in a fairing (49), the fairing (49) is arranged in a flow channel of the central supporting pipe (6), the fairing (49) is located behind the flow direction of the axial flow blades (410), an outer pipe and an inner pipe are arranged on the fairing (49), and an axial fairing blade plate which is circumferentially arranged is arranged between the outer pipe and the inner pipe.

4. A refrigeration and heating system of a heat pump unit according to claim 2, wherein: through holes (414) which are communicated with the shell pass are respectively formed in the central supporting tube (6) in front of and behind the axial flow blades (410).

5. A refrigeration and heating system of a heat pump unit according to claim 2, wherein: and a mechanical sealing device (46) is arranged at the position of the transmission shaft (47) penetrating through the bearing seat (45) at the end part of the support sleeve (48), and a sealing ring (412) is arranged between the flange at the end part of the support sleeve (48) and the flange at the end part of the central support pipe (6).

6. A refrigeration and heating system of a heat pump unit according to claim 1, wherein: backup pad (5) are including inlayer pipe backup pad (51) and outer pipe backup pad (52), backup pad (5) are S type structure, inlayer pipe backup pad (51) and outer pipe backup pad (52) are "the [" structure, inlayer pipe backup pad (51) welds with the one end of outer pipe backup pad (52), forms backup pad (5) of S type structure, the side of inlayer pipe backup pad (51) and outer pipe backup pad (52) is evenly seted up flutedly (53), recess (53) are used for placing heat exchange tube (11).