CN210688834U

CN210688834U - Heat accumulating type heat pump defrosting system

Info

Publication number: CN210688834U
Application number: CN201921444860.9U
Authority: CN
Inventors: 侯东明; 王聪; 朱虹光
Original assignee: Tongfang Refine Energy Saving Technology Co ltd
Current assignee: Tongfang Refine Energy Saving Technology Co ltd
Priority date: 2019-09-02
Filing date: 2019-09-02
Publication date: 2020-06-05
Anticipated expiration: 2029-09-02

Abstract

The utility model discloses a heat accumulating type heat pump defrosting system, which comprises a refrigerant loop for refrigerant circulation, wherein the refrigerant loop comprises a compressor, a four-way reversing valve, a condensation heat exchange unit, a two-way throttle valve, an evaporation heat exchange unit and a heat accumulating device; in the heat pump mode, the four-way reversing valve conducts the first port and the third port and conducts the second port and the fourth port, and the heat storage device stores heat; in the cooling mode, the four-way reversing valve switches directions and conducts the first port and the second port and conducts the third port and the fourth port, and the heat storage device releases heat. The utility model discloses an increase the heat accumulation device that can the heat transfer in the refrigerant return circuit, can be under the defrosting mode for the refrigerant return circuit release the condensation heat that accumulates during heat pump mode operation, replace the evaporation heat transfer unit from the absorptive heat in the environment of locating to this reaches the purpose of the quick defrosting in refrigerant return circuit, has that the system is simple, the defrosting is stable, heat exchange efficiency is high, can avoid the indoor side to blow the advantage of cold wind.

Description

Heat accumulating type heat pump defrosting system

Technical Field

The utility model relates to an air treatment equipment technical field especially relates to a heat accumulation formula heat pump defrosting system.

Background

At present, the existing defrosting scheme of a refrigerant system heat pump basically adopts a reverse defrosting mode of switching a refrigerant circuit from a heat pump mode to a refrigeration mode to perform reverse operation defrosting, or adopts a hot gas bypass defrosting mode of guiding one bypass circuit from a compressor exhaust port to guide the compressor exhaust to the interior of an outdoor heat exchange unit to perform defrosting. Considering the existing reverse defrosting mode, during defrosting, the evaporation heat exchange unit needs to absorb heat additionally from the environment, so that the temperature of indoor air is reduced, and the indoor temperature control is influenced. Meanwhile, for the air conditioning equipment with full fresh air, the evaporation heat exchange unit in the existing reverse defrosting mode adopts the fresh air with low temperature for heat exchange, the efficiency is low, and a refrigerating system is unstable. The adoption of the hot gas bypass defrosting mode has the problems of long defrosting time, high load operation of a compressor during defrosting, liquid compression of the compressor and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a heat accumulation formula heat pump defrosting system, in conventional heat pump refrigerating system, but increase the heat accumulation device of heat transfer, can release the absorptive condensation heat during heat pump mode operation for the refrigerant return circuit under the defrosting mode, replace the evaporation heat transfer unit from the absorptive heat in the environment of locating, reach the purpose of refrigerant return circuit defrosting with this, it is simple to have a system, the defrosting is stable, can avoid the indoor side to blow the advantage of cold wind, reverse defrosting causes the decline of indoor side air temperature among the prior art, the problem that heat exchange efficiency is low.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a heat accumulating type heat pump defrosting system comprises a refrigerant loop for circulating a refrigerant, wherein the refrigerant loop comprises a compressor, a four-way reversing valve, a condensation heat exchange unit, a two-way throttle valve, an evaporation heat exchange unit and a heat accumulating device;

the exhaust end of the compressor is communicated with the first port of the four-way reversing valve through a first pipeline, one end of the condensation heat exchange unit is communicated with the second port of the four-way reversing valve through a second pipeline, the other end of the condensation heat exchange unit is communicated with one end of the two-way throttle valve through a third pipeline, the other end of the two-way throttle valve is communicated with one end of the evaporation heat exchange unit through a fourth pipeline, the other end of the evaporation heat exchange unit is communicated with one end of the heat storage device, the other end of the heat storage device is communicated with the third port of the four-way reversing valve, and the fourth port of the four-way reversing valve is communicated with the air inlet end of the compressor through a fifth pipeline;

in the heat pump mode, the four-way selector valve communicates the first port with the third port and communicates the second port with the fourth port, and the heat storage device stores heat; in a cooling mode, the four-way reversing valve switches directions and conducts the first port and the second port and conducts the third port and the fourth port, and the heat storage device releases heat.

The four-way reversing valve is switched between the refrigeration mode operation and the heat pump mode operation according to actual needs, so that the four-way reversing valve guides the refrigerant to the heat storage device in the heat pump mode, and the four-way reversing valve guides the refrigerant to the condensation heat exchange unit in the refrigeration mode.

The bidirectional throttle valve plays a role in throttling and depressurizing the refrigerant, is a throttling expansion part for throttling the medium-temperature high-pressure liquid refrigerant in the refrigerant loop into low-temperature low-pressure gas-liquid two-phase refrigerant, and can divide the system into a high-pressure side and a low-pressure side.

The heat storage device can store part of heat of the high-temperature refrigerant in the refrigerant loop by exchanging heat in the heat storage device during the operation of the heat pump mode; when the defrosting signal is received and the refrigeration mode needs to be switched to carry out reverse operation defrosting, the heat storage device plays a role of a main evaporation heat exchange unit, and heat accumulated by the heat storage device in the heat pump mode can be released to provide heat required by evaporation for a refrigerant loop at the moment, so that the heat is prevented from being additionally absorbed from the environment, and the purposes of defrosting and preventing indoor cold air from being blown are achieved.

Furthermore, the heat storage device comprises a hollow shell and a heat exchange pipeline which is positioned in an inner cavity of the shell and distributed in a serpentine winding manner, a heat storage medium which exchanges heat with the heat exchange pipeline is filled in the inner cavity of the shell, and two ends of the heat exchange pipeline are respectively communicated with the evaporation heat exchange unit and a third port of the four-way reversing valve. By the arrangement, the heat storage device becomes a closed efficient heat exchanger, and when a refrigerant passes through a heat exchange pipeline in the heat storage device, the refrigerant can exchange heat with a heat storage medium to transfer heat, so that heat storage and heat release of the heat storage device are realized. The snakelike heat exchange pipeline that coils the distribution can increase area of contact, improves heat exchange efficiency.

Further, the outer surface of the shell is provided with a heat insulation layer to prevent the heat storage device from exchanging heat with the external environment and maintain the internal temperature of the heat storage device.

Preferably, the heat storage medium is heat-conducting heat storage oil. The thermal storage oil can store a large amount of heat.

Furthermore, the refrigerant loop further comprises an oil separator, the oil separator is arranged on the first pipeline, an air inlet of the oil separator is communicated with an exhaust end of the compressor, an air outlet of the oil separator is communicated with a first port of the four-way reversing valve, and an oil outlet of the oil separator is communicated with an air inlet end of the compressor. The oil separator is used for separating lubricating oil in high-pressure refrigerant discharged by the compressor so as to ensure that the device can safely and efficiently operate.

Furthermore, the refrigerant loop further comprises a dry filter, and the dry filter is arranged on the third pipeline between the condensation heat exchange unit and the two-way throttle valve and used for filtering impurities and drying in the refrigerant loop.

Further, the refrigerant circuit further comprises a liquid receiver, and the liquid receiver is arranged on the third pipeline between the condensation heat exchange unit and the drying filter and used for storing surplus refrigerant in the refrigerant circuit.

Further, the refrigerant loop further comprises a gas-liquid separator, and the gas-liquid separator is arranged on the fifth pipeline between the fourth port of the four-way reversing valve and the air inlet end of the compressor, so that the refrigerant to be fed into the air inlet end of the compressor is subjected to gas-liquid separation.

Furthermore, a low-pressure gauge, a pressure controller and a high-pressure gauge are sequentially connected between the air inlet end of the compressor and the first port of the four-way reversing valve in series and used for controlling the operation of the compressor so as to adjust the pressure in the refrigerant loop.

Further, the compressor is a single high-efficiency scroll compressor or a compressor unit formed by connecting a plurality of high-efficiency scroll compressors in parallel. The high-efficiency scroll compressor is adopted to provide a power source for the refrigerant to circularly flow in the refrigerant loop. Specifically, a single-machine use or multi-machine parallel connection use mode is selected according to actual needs, for example, when the cold quantity requirement is large, a plurality of high-efficiency scroll compressors are selected to be connected in parallel to provide a more sufficient power source, so that the cold quantity requirement is met.

Furthermore, the evaporation heat exchange unit and the two-way throttle valve are arranged in an indoor air conditioning unit, and the condensation heat exchange unit, the compressor and the four-way reversing valve are arranged in an outdoor air conditioning unit. The heat accumulating type heat pump defrosting system is applied to an air conditioning unit in an air conditioning system and is respectively and correspondingly arranged on an indoor side air conditioning unit and an outdoor side air conditioning unit.

Furthermore, the indoor side air conditioning unit is equipped with blast gate and indoor side forced draught blower, outdoor side air conditioning unit is equipped with the condensing fan. The air valve is used for controlling the conduction or the closing between the inside and the outside of the indoor side air conditioning unit, and the indoor side blower is used for blowing air to the indoor.

Further, the heat storage device is arranged in the indoor side air conditioning unit; or, the heat storage device is provided in the outdoor air conditioning unit.

Compared with the prior art, the utility model provides a heat accumulation formula heat pump defrosting system possesses following beneficial effect:

the utility model discloses an increase the heat accumulation device that can the heat transfer in the refrigerant return circuit, can be under the defrosting mode for the refrigerant return circuit release the condensation heat that accumulates during heat pump mode operation, replace the evaporation heat transfer unit from the absorptive heat in the environment of locating to this reaches the purpose of the quick defrosting in refrigerant return circuit, has that the system is simple, the defrosting is stable, heat exchange efficiency is high, can avoid the indoor side to blow the advantage of cold wind.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic diagram of a first embodiment of the present invention;

fig. 2 is a schematic structural view of the heat storage device of the present invention;

fig. 3 is a schematic structural diagram of an embodiment of the present invention in a heat pump mode;

fig. 4 is a schematic structural diagram of an embodiment of the present invention in a cooling mode;

fig. 5 is a schematic structural diagram of a second embodiment of the present invention.

Reference numerals: 1. a compressor; 2. a four-way reversing valve; 21. a first port; 22. a second port; 23. a third port; 24. a fourth port; 3. a condensation heat exchange unit; 4. a two-way throttle valve; 5. an evaporation heat exchange unit; 6. a heat storage device; 61. a housing; 62. a heat exchange conduit; 63. a thermal storage medium; 64. a heat-insulating layer; 7. an oil separator; 8. drying the filter; 9. a liquid reservoir; 10. a gas-liquid separator; 11. a low pressure gauge; 12. a pressure controller; 13. a high pressure gauge; 14. an indoor side air conditioning unit; 141. an air valve; 142. an indoor blower; 15. an outdoor side air conditioning unit; 151. a condensing fan; 101. a first conduit; 102. a second conduit; 103. a third pipeline; 104. a fourth conduit; 105. a fifth pipeline; F.A, fresh air; and S.A, air supply.

Detailed Description

The technical solution of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship 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.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," "connected," and the like are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1 to 5, the utility model provides a heat accumulating type heat pump defrosting system, which comprises a refrigerant loop for refrigerant circulation, wherein the refrigerant loop comprises a compressor 1, a four-way reversing valve 2, a condensation heat exchange unit 3, a two-way throttle valve 4, an evaporation heat exchange unit 5 and a heat accumulating device 6; the exhaust end of the compressor 1 is communicated with a first port 21 of the four-way reversing valve 2 through a first pipeline 101, one end of a condensation heat exchange unit 3 is communicated with a second port 22 of the four-way reversing valve 2 through a second pipeline 102, the other end of the condensation heat exchange unit 3 is communicated with one end of a two-way throttle valve 4 through a third pipeline 103, the other end of the two-way throttle valve 4 is communicated with one end of an evaporation heat exchange unit 5 through a fourth pipeline 104, the other end of the evaporation heat exchange unit 5 is communicated with one end of a heat storage device 6, the other end of the heat storage device 6 is communicated with a third port 23 of the four-way reversing valve 2, and a fourth port 24 of the four-way reversing valve 2 is communicated with the air inlet end of the; in the heat pump mode, the four-way selector valve 2 opens the first port 21 and the third port 23 and opens the second port 22 and the fourth port 24, and the heat storage device 6 stores heat; in the cooling mode, the four-way selector valve 2 switches the direction and conducts the first port 21 and the second port 22 and the third port 23 and the fourth port 24, and the heat storage device 6 releases heat.

Therefore, by adding the heat storage device 6 capable of exchanging heat in the refrigerant loop, the heat of condensation accumulated in the heat pump mode operation period can be released for the refrigerant loop in the defrosting mode to replace the heat absorbed by the evaporation heat exchange unit from the environment, so that the purpose of quickly defrosting the refrigerant loop is achieved, and the defrosting device has the advantages of simple system, stable defrosting, high heat exchange efficiency and capability of avoiding blowing cold air at the indoor side.

The present invention will be described in further detail below with reference to detailed embodiments and the accompanying drawings.

Example one

Referring to fig. 1 to 4, the present embodiment provides a heat accumulating type heat pump defrosting system, including a refrigerant loop for circulating a refrigerant, where the refrigerant loop includes a compressor 1, a four-way reversing valve 2, a condensing heat exchange unit 3, a two-way throttle valve 4, an evaporating heat exchange unit 5, and a heat accumulating device 6, an exhaust end of the compressor 1 is communicated with a first port 21 of the four-way reversing valve 2 through a first pipeline 101, one end of the condensing heat exchange unit 3 is communicated with a second port 22 of the four-way reversing valve 2 through a second pipeline 102, the other end of the condensing heat exchange unit 3 is communicated with one end of the two-way throttle valve 4 through a third pipeline 103, the other end of the two-way throttle valve 4 is communicated with one end of the evaporating heat exchange unit 5 through a fourth pipeline 104, the other end of the evaporating heat exchange unit 5 is communicated with one end of the heat accumulating device 6, the other end of the heat, the fourth port 24 of the four-way reversing valve 2 communicates with the intake end of the compressor 1 through a fifth conduit 105. In the heat pump mode, the four-way selector valve 2 opens the first port 21 and the third port 23 and opens the second port 22 and the fourth port 24, and the heat storage device 6 stores heat; in the cooling mode, the four-way selector valve 2 switches the direction and conducts the first port 21 and the second port 22 and the third port 23 and the fourth port 24, and the heat storage device 6 releases heat. The four-way reversing valve 2 is an electronic multi-channel reversing valve and is provided with a first port 21, a second port 22, a third port 23 and a fourth port 24, and switching is performed according to actual needs under the operation of a refrigeration mode and the operation of a heat pump mode, so that the four-way reversing valve 2 guides the refrigerant to the heat storage device 6 in the heat pump mode, and the four-way reversing valve 2 guides the refrigerant to the condensation heat exchange unit 3 in the refrigeration mode. The two-way throttle valve 4 is a thermal expansion valve or an electronic expansion valve, plays a role in throttling and depressurizing the refrigerant, is a throttling expansion part for throttling the medium-temperature high-pressure liquid refrigerant in the refrigerant loop into low-temperature low-pressure gas-liquid two-phase refrigerant, and can divide the system into a high-pressure side and a low-pressure side. The heat storage device 6 may store a part of heat of the high-temperature refrigerant in the refrigerant circuit by exchanging heat inside the heat storage device 6 during the heat pump mode operation; when the defrosting signal is received and the refrigeration mode needs to be switched to carry out reverse operation defrosting, the heat storage device 6 plays a role of a main evaporation heat exchange unit, and heat accumulated by the heat storage device 6 in the heat pump mode can be released to provide heat required by evaporation for a refrigerant loop at the moment, so that the heat is prevented from being absorbed additionally from the environment, and the purposes of defrosting and avoiding blowing cold air to the indoor are achieved.

Referring to fig. 2, the heat storage device 6 includes a hollow housing 61 and a heat exchange pipe 62 located in an inner cavity of the housing 61, the inner cavity of the housing 61 is filled with a heat storage medium 63 exchanging heat with the heat exchange pipe 62, and two ends of the heat exchange pipe 62 are respectively communicated with the evaporation heat exchange unit 5 and the third port 23 of the four-way reversing valve 2. The heat exchange pipes 62 are distributed in a serpentine shape in a winding manner to increase the contact area and improve the heat exchange efficiency. The heat storage medium 63 is heat-conductive heat storage oil so that a large amount of heat can be stored. The arrangement is such that the heat storage device 6 becomes a closed efficient heat exchanger, when the refrigerant passes through the heat exchange pipeline 62 in the heat storage device 6, the refrigerant can exchange heat with the heat storage medium 63 to realize heat storage and heat release of the heat storage device 6.

In some embodiments, the outer surface of the housing 61 is provided with an insulating layer 64 to prevent the thermal storage device 6 from exchanging heat with the external environment and maintain the internal temperature of the thermal storage device 6.

In this embodiment, evaporation heat transfer unit 5 and condensation heat transfer unit 3 are the finned tube heat exchanger of forced air cooling, and finned tube heat exchanger comprises parent tube and fin, and the fin is installed on the parent tube, and the parent tube adopts copper light pipe or internal thread pipe, and the fin is straight fin, sawtooth fin, porous fin or the ripple fin of aluminium or copper product material. Of course, in other embodiments, the condensing heat exchange unit 3 may also adopt other condensing heat exchangers, such as a water-cooled heat exchanger.

In the present embodiment, referring to fig. 1, the refrigerant circuit further includes an oil separator 7, a drying filter 8, a liquid receiver 9, and a gas-liquid separator 10. Specifically, the oil separator 7 is arranged on the first pipeline 10, an air inlet of the oil separator 7 is communicated with an air exhaust end of the compressor 1, an air outlet of the oil separator 7 is communicated with a first port 21 of the four-way reversing valve 2, and an oil outlet of the oil separator 7 is communicated with an air inlet end of the compressor 1. The oil separator 7 is provided to separate the lubricating oil in the high-pressure refrigerant discharged from the compressor 1 to ensure safe and efficient operation of the apparatus. The drying filter 8 is arranged on the third pipeline 103 between the condensation heat exchange unit 3 and the two-way throttle valve 4 and is used for filtering impurities and drying in the refrigerant loop. The receiver 9 is disposed on the third pipeline 103 between the condensing heat exchange unit 3 and the drying filter 8, and is configured to store the surplus refrigerant in the refrigerant circuit. The gas-liquid separator 10 is disposed on the fifth pipe 105 between the fourth port 24 of the four-way selector valve 2 and the intake end of the compressor 1 to separate gas and liquid of the refrigerant to be introduced into the intake end of the compressor 1.

In the present embodiment, the compressor 1 is a single high-efficiency scroll compressor. The high-efficiency scroll compressor is adopted to provide a power source for the refrigerant to circularly flow in the refrigerant loop. It should be noted that, in some application occasions, the number of the compressors 1 can be reasonably selected, for example, when the heat accumulating type heat pump defrosting system of the present invention is applied to a multi-unit air conditioning system, the compressor 1 is a compressor unit formed by connecting a plurality of high-efficiency scroll compressors in parallel. That is to say, according to the actual need, a single-machine use or multi-machine parallel use mode is selected, for example, when the cold requirement is large, a plurality of high-efficiency scroll compressors are selected to be connected in parallel to provide a more sufficient power source so as to meet the cold requirement.

In some embodiments, a low pressure gauge 11, a pressure controller 12 and a high pressure gauge 13 are connected in series between the air inlet of the compressor 1 and the first port 21 of the four-way reversing valve 2, for controlling the operation of the compressor 1 to adjust the pressure in the refrigerant circuit.

In this embodiment, referring to fig. 3, the heat accumulating type heat pump defrosting system of the present invention is applied to the air conditioning unit in the air conditioning system, and is correspondingly installed in the indoor side air conditioning unit 14 and the outdoor side air conditioning unit 15, respectively. Specifically, the drying filter 8, the evaporation heat exchange unit 5, the two-way throttle valve 4, and the heat storage device 6 are disposed in the indoor-side air conditioning unit 14, and the compressor 1, the oil separator 7, the liquid reservoir 9, the gas-liquid separator 10, the condensation heat exchange unit 3, and the four-way selector valve 2 are disposed in the outdoor-side air conditioning unit 15. The indoor air conditioning unit 14 is provided with an air valve 141 and an indoor air blower 142, and the outdoor air conditioning unit 15 is provided with a condensing fan 151. The air valve 141 controls opening and closing of an air passage between the inside and the outside of the indoor air conditioning unit 14, and the indoor air blower 142 blows air into the room.

In addition, in order to facilitate observation or adjustment, the utility model discloses a heat accumulation formula heat pump defrosting system can also be provided with parts such as controlling means (not shown in the figure) to the running state of each equipment in the control working process. The control device is used for receiving, analyzing, processing and sending control information to each part, for example, after receiving a defrosting signal of the condensation heat exchange unit in the heat pump mode of the refrigerant system, the control device correspondingly adjusts the direction of the switching four-way reversing valve 2, and switches the heat pump mode into the refrigeration mode to perform reverse operation defrosting. The control device can be provided with parameter displays such as temperature, humidity, outlet air temperature (temperature of damp and hot air), power supply indication, pressure on two sides of the compressor, operation of an air valve, operation of an indoor side air feeder, operation of a condensing fan, state of a four-way reversing valve, indication setting operation, a stop button, fault indication, reset and the like in the air conditioning unit.

The working principle of the utility model is explained as follows:

(A) operating State one

Referring to fig. 3, at this time, the heat accumulating type heat pump defrosting system of the present invention is in the operation heat pump mode, and the heat accumulating device 6 accumulates heat during this period.

An air treatment device: the indoor side blower 142 and the air valve 141 are in an open state. The air passes through the damper 141, the heat storage device 6, the evaporation heat exchange unit 5, and the indoor side blower 142 in this order. In this operation mode, the heat storage device 6 is in a heat storage state, the evaporation heat exchange unit 5 is in a condensation heat release state, and air is heated by heat exchange with the evaporation heat exchange unit 5 and is sent into the room by the indoor side blower 142.

A refrigerant loop: the four-way reversing valve 2 conducts the first port 21 and the third port 23 and conducts the second port 22 and the fourth port 24. The refrigerant (i.e. refrigerant) sequentially passes through the exhaust end of the compressor 1, the oil separator 7, the first port 21 of the four-way reversing valve 2, the third port 23 of the four-way reversing valve 2, the heat storage device 6, the evaporation heat exchange unit 5, the two-way throttle valve 4, the drying filter 8, the liquid reservoir 9, the condensation heat exchange unit 3, the second port 22 of the four-way reversing valve 2, the fourth port 24 of the four-way reversing valve 2, the gas-liquid separator 10 and the air inlet end of the compressor 1.

(B) Operating state two

Referring to fig. 4, at this time, the heat accumulating type heat pump defrosting system of the present invention is switched to the operation cooling mode, and the heat accumulating device 6 releases heat during this period.

An air treatment device: when the control device of the air processing equipment receives a defrosting signal, the condensation heat exchange unit 3 enters a defrosting mode, at the moment, the control device can adjust and switch the direction of an interface channel of the four-way reversing valve 2, the flow direction of a refrigerant is switched, and meanwhile, the indoor side air blower 142 and the air valve 141 are closed, so that cold air blowing to the indoor is avoided. In this operation mode, the heat storage device 6 is in a heat release state.

A refrigerant loop: the four-way reversing valve 2 switches direction and conducts the first port 21 and the second port 22 and the third port 23 and the fourth port 24. The refrigerant (i.e. refrigerant) sequentially passes through the exhaust end of the compressor 1, the oil separator 7, the first port 21 of the four-way reversing valve 2, the second port 22 of the four-way reversing valve 2, the condensation heat exchange unit 3, the liquid receiver 9, the drying filter 8, the two-way throttle valve 4, the evaporation heat exchange unit 5, the heat storage device 6, the third port 23 of the four-way reversing valve 2, the fourth port 24 of the four-way reversing valve 2, the gas-liquid separator 10 and the air inlet end of the compressor 1.

Defrosting principle: in the process of the operation state, the heat storage device 6 plays a role of a main evaporation heat exchange unit, releases heat accumulated in the first operation state, provides a heat source for refrigerant evaporation heat absorption, avoids heat exchange between the evaporation heat exchange unit 5 and the internal air of the indoor air conditioning unit 14, and can further avoid the condition of blowing cold air indoors.

(C) Operating state three

Referring to fig. 3, at this time, the heat accumulating type heat pump defrosting system of the present invention is switched to the operation heat pump mode, and the heat accumulating device 6 continues to accumulate heat during this period.

An air treatment device: when the control device of the air processing equipment receives the defrosting releasing signal, the condensing heat exchange unit 3 releases the defrosting mode, at the moment, the control device can adjust and restore the direction of the interface channel of the four-way reversing valve 2, switch the flow direction of the refrigerant, and simultaneously open the indoor side blower 142 and the air valve 141. In this operation mode, the heat storage device 6 is in a heat storage state, the evaporation heat exchange unit 5 is in a condensation heat release state, and air is heated by heat exchange with the evaporation heat exchange unit 5, and hot air is fed into the room again by the indoor side air feeder 142.

(D) Repeating the above operation

And when the control device of the air treatment equipment receives the defrosting signal again, the second operation state and the third operation state are repeated to perform cycle repeated work. The whole refrigerant loop is switched by the channel of the four-way reversing valve 2, and the defrosting work of the system is completed by utilizing the switching of the heat storage and heat release working states of the heat storage device 6. The whole system is simple, the defrosting is stable, the control is flexible, and the condition of blowing cold air indoors can be completely avoided.

Example two

Referring to fig. 5, the present embodiment provides a heat accumulating type heat pump defrosting system with another structure distribution, which is different from the first embodiment in that the heat accumulating device 6 is disposed in the outdoor air conditioning unit 15, so that the overall size of the indoor air conditioning unit 14 can be reduced.

Furthermore, the utility model relates to a heat accumulation formula heat pump defrosting system can be arranged in the air treatment facilities of heat pump direct expansion type or have the similar equipment of same functional requirement in, can be applied to each trade such as medicine, food, electron, storage, and the range of application is extensive.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A heat accumulating type heat pump defrosting system is characterized in that: the system comprises a refrigerant loop for circulating a refrigerant, wherein the refrigerant loop comprises a compressor (1), a four-way reversing valve (2), a condensation heat exchange unit (3), a two-way throttle valve (4), an evaporation heat exchange unit (5) and a heat storage device (6);

the exhaust end of the compressor (1) is communicated with a first port (21) of the four-way reversing valve (2) through a first pipeline (101), one end of the condensation heat exchange unit (3) is communicated with the second port (22) of the four-way reversing valve (2) through a second pipeline (102), the other end of the condensation heat exchange unit (3) is communicated with one end of the bidirectional throttle valve (4) through a third pipeline (103), the other end of the two-way throttle valve (4) is communicated with one end of the evaporation heat exchange unit (5) through a fourth pipeline (104), the other end of the evaporation heat exchange unit (5) is communicated to one end of the heat storage device (6), the other end of the heat storage device (6) is communicated to a third port (23) of the four-way reversing valve (2), a fourth port (24) of the four-way reversing valve (2) is communicated with the air inlet end of the compressor (1) through a fifth pipeline (105);

in a heat pump mode, the four-way selector valve (2) communicates the first port (21) with the third port (23) and communicates the second port (22) with the fourth port (24), and the heat storage device (6) stores heat; in a cooling mode, the four-way reversing valve (2) switches directions and conducts the first port (21) and the second port (22) and the third port (23) and the fourth port (24), and the heat storage device (6) releases heat.

2. A heat accumulating heat pump defrosting system according to claim 1, wherein the heat accumulating device (6) comprises a hollow casing (61) and a heat exchanging pipeline (62) which is positioned in the inner cavity of the casing (61) and distributed in a serpentine shape, the inner cavity of the casing (61) is filled with a heat accumulating medium (63) which exchanges heat with the heat exchanging pipeline (62), and two ends of the heat exchanging pipeline (62) are respectively communicated with the evaporation heat exchanging unit (5) and the third port (23) of the four-way reversing valve (2).

3. A regenerative heat pump defrosting system according to claim 2 wherein the outer surface of the casing (61) is provided with an insulating layer (64).

4. A regenerative heat pump defrosting system according to claim 2 wherein the heat storage medium (63) is heat conductive heat storage oil.

5. A regenerative heat pump defrosting system according to claim 1 wherein the refrigerant circuit further comprises an oil separator (7), the oil separator (7) is disposed on the first pipe (101), an air inlet of the oil separator (7) is communicated with an air outlet of the compressor (1), an air outlet of the oil separator (7) is communicated with the first port (21) of the four-way reversing valve (2), and an oil outlet of the oil separator (7) is communicated with an air inlet of the compressor (1).

6. A regenerative heat pump defrosting system according to claim 1 wherein the refrigerant circuit further comprises a dry filter (8), the dry filter (8) being disposed on the third conduit (103) between the condensing heat exchange unit (3) and the two-way throttle valve (4).

7. A regenerative heat pump defrosting system according to claim 6 wherein the refrigerant circuit further comprises a receiver (9), the receiver (9) being arranged on the third conduit (103) between the condensing heat exchange unit (3) and the dry filter (8).

8. A regenerative heat pump defrosting system according to claim 1 wherein the refrigerant circuit further comprises a gas-liquid separator (10), the gas-liquid separator (10) being disposed on the fifth pipe (105) between the fourth port (24) of the four-way reversing valve (2) and the inlet side of the compressor (1).

9. A regenerative heat pump defrosting system according to claim 1 wherein a low pressure gauge (11), a pressure controller (12) and a high pressure gauge (13) are connected in series between the inlet of the compressor (1) and the first port (21) of the four-way reversing valve (2).

10. A regenerative heat pump defrosting system according to claim 9 wherein the compressor (1) is a single high efficiency scroll compressor or a compressor set consisting of multiple high efficiency scroll compressors connected in parallel.

11. A heat accumulating type heat pump defrosting system according to any one of claims 1 to 10, wherein the evaporation heat exchange unit (5) and the two-way throttle valve (4) are arranged in an indoor air conditioning unit (14), and the condensation heat exchange unit (3), the compressor (1) and the four-way reversing valve (2) are arranged in an outdoor air conditioning unit (15).

12. A regenerative heat pump defrosting system according to claim 11 wherein said indoor air conditioning unit (14) is provided with an air valve (141) and an indoor air blower (142), and said outdoor air conditioning unit (15) is provided with a condensing fan (151).

13. A regenerative heat pump defrosting system according to claim 12 wherein the heat storage means (6) is located in the indoor air conditioning unit (14).

14. A regenerative heat pump defrosting system according to claim 12 wherein said heat storage means (6) is located within said outdoor air conditioning unit (15).