CN206846873U

CN206846873U - Heating unit

Info

Publication number: CN206846873U
Application number: CN201720728778.3U
Authority: CN
Inventors: 邓志扬; 袁明征; 邓伟彬; 张勇; 杨文军; 熊月忠; 郑潇涵; 李敬泉; 周宏宇
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2017-06-21
Filing date: 2017-06-21
Publication date: 2018-01-05
Anticipated expiration: 2027-06-21

Abstract

The utility model discloses a unit heats, this unit includes: the device comprises a compressor (1), a condenser (2), a reversing mechanism and two evaporators; the condenser (2) and the reversing mechanism are sequentially connected in a refrigerant circulating loop between the exhaust end of the compressor (1) and the suction end of the compressor (1) in a matched manner; the two evaporators are respectively connected to the refrigerant circulating pipeline in an adaptive mode through the reversing mechanism and used for realizing the switching defrosting of the two heating modes through the reversing of the reversing mechanism. The utility model discloses a scheme can overcome among the prior art heating poor stability, change the big and user experience poor grade defect of the frost degree of difficulty, realizes heating good stability, changes the little and user experience good beneficial effect of the frost degree of difficulty.

Description

Heating unit

Technical Field

The utility model belongs to the technical field of heat, concretely relates to unit that heats especially relates to a heat pump hot water unit or the control method who heats air conditioning unit and this unit of heating invariant.

Background

The air source heat pump hot water unit can adopt green pollution-free cold coal to absorb heat in air, and produce domestic hot water by working of a compressor. The defrosting mode of an external unit (namely an outdoor evaporator) of a heat pump hot water unit can be generally divided into two types: firstly, bypass defrosting; secondly, the change is reversed and the frost is removed.

The bypass defrosting is to bypass the link of throttling, and the refrigerant is directly sent to an evaporator to be defrosted, at the moment, the evaporator is condensed, and the condensed refrigerant flows back to the compressor through a vapor-liquid separator; therefore, the refrigerant is not evaporated. In the bypass defrosting process, the refrigerant is not subjected to evaporation heat exchange, so the liquid return risk is high, the defrosting efficiency is low, and the refrigerant is gradually eliminated. Reversing defrosting is the mainstream, but in the reversing defrosting process, heat needs to be absorbed from a heating side, so that temperature fluctuation of the heating side is caused, and user experience is influenced; especially in northern areas, haze is serious in winter, the unit frosts more frequently, and heating temperature fluctuates more.

In the prior art, the defects of poor heating stability, high defrosting difficulty, poor user experience and the like exist.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the above-mentioned defect, provide a heat unit to solve among the prior art switching-over change the frost in-process and need follow the heating side endothermic problem that leads to the poor stability that heats, reach the effect that promotes the stability that heats.

The utility model provides a heat unit, include: the system comprises a compressor, a condenser, a reversing mechanism and two evaporators; the condenser and the reversing mechanism are sequentially connected in a refrigerant circulation loop between the exhaust end of the compressor and the suction end of the compressor in a matched manner; the two evaporators are respectively connected to the refrigerant circulating pipeline in an adaptive mode through the reversing mechanism and used for realizing the switching defrosting of the two heating modes through the reversing of the reversing mechanism.

Optionally, the method further comprises: a throttling element; the throttling element is connected to a refrigerant pipeline between two adjacent evaporators in the two evaporators in an adaptive manner, so that the refrigerant throttling between the two adjacent evaporators in any heating mode is realized.

Optionally, the method further comprises: two fans; the two fans are matched with the two evaporators one by one; wherein each fan is used for being closed when the evaporator matched with the fan is defrosted or being operated when the evaporator matched with the fan is not defrosted.

Optionally, the method further comprises: a gas-liquid separator; and the gas-liquid separator is connected between the suction end of the compressor and the reversing mechanism in an adaptive manner.

Optionally, wherein two of the evaporators comprise: a first evaporator and a second evaporator; and/or, the reversing mechanism comprises: a four-way valve; and/or, when the assembly further comprises a throttling element, the throttling element comprises: at least one of an electronic expansion valve, a thermostatic expansion valve and a capillary tube; and/or, when the unit further comprises two fans, the two fans comprise: a first fan and a second fan.

Optionally, a reversing tube of the four-way valve is adapted to be connected to the first evaporator; the other reversing pipe of the four-way valve is connected to the second evaporator in a matching mode; and/or the throttling element is connected to a refrigerant pipeline between the first evaporator and the second evaporator in a matching manner; and/or the first fan is matched with the first evaporator, and the second fan is matched with the second evaporator.

Optionally, the layout structure of the first evaporator and the second evaporator includes: the structure comprises a split type independent structure and/or at least one integrated structure of an upper layered structure, a lower layered structure and a left layered structure and a right layered structure.

Optionally, the air outlet mode of the integrated structure includes: at least one of side air outlet, upper air outlet and lower air outlet.

Optionally, the heating unit includes: at least one of a heat pump hot water unit and a heating air conditioning unit; and/or at least one of the condenser and each of the evaporators comprises: at least one of a fin heat exchanger, a microchannel heat exchanger, a double tube heat exchanger, and a shell and tube heat exchanger.

The scheme of the utility model, through adjusting the connection mode of the four-way valve, the E pipe of the four-way valve and the C pipe of the four-way valve are respectively connected with a heat exchanger (for example: a fin heat exchanger, a micro-channel heat exchanger, a sleeve heat exchanger, a shell and tube heat exchanger, etc.), and the constant heating capacity in the defrosting process (for example: the constant water temperature of the heat pump hot water unit in the defrosting process) is realized by changing the sequence of the refrigerant flowing through the two fins during defrosting.

Furthermore, according to the scheme of the utility model, by adjusting the position of the four-way valve and adding a fin heat exchanger (if the side air outlet double-fan shell is adopted, the fin heat exchanger is not required to be added), the problem of water temperature fluctuation caused by the defrosting process is solved, and the heating comfort is improved; meanwhile, the temperature before throttling is reduced, refrigerant liquefaction is facilitated, the dryness and the temperature after throttling are reduced, and the evaporation heat exchange quantity is improved.

Therefore, the utility model discloses a scheme, after through adjusting reversing mechanism to the condenser, make the exhaust of compressor preferentially exothermic through the condenser, and realize two mode switch of heating through reversing mechanism and change the frost, realize changing the frost in-process heating volume invariable, solve among the prior art switching change the frost in-process and need follow the heat conduction of heating side and lead the poor problem of stability of heating, thereby, overcome among the prior art the stability of heating poor, change the big and poor defect of user experience of the frost degree of difficulty, the realization is heated stability good, change the little and good beneficial effect of user experience of the frost degree of difficulty.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention.

The technical solution of the present invention is further described in detail by the accompanying drawings and examples.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of a heating unit according to the present invention;

FIG. 2 is a schematic structural diagram of the side-outlet upper-lower structure of two evaporators (e.g., the upper-lower layered layout structure of two evaporators) in the apparatus of the present invention;

FIG. 3 is a schematic structural view of a side-outlet left-right structure or an upper-outlet structure (e.g., a left-right layered layout structure of two evaporators) of two evaporators of the apparatus of the present invention;

FIG. 4 is a schematic structural diagram of a split structure of two evaporators (e.g., a split independent layout structure of two evaporators) in the apparatus of the present invention;

fig. 5 is a schematic flow chart of an embodiment of a method for controlling a heating unit according to the present invention.

With reference to the accompanying drawings, the embodiments of the present invention have the following reference numerals:

1-a compressor; 2-a condenser; 3-a four-way valve; 4-a first evaporator; 5-a first fan; 6-a throttling element; 7-a second evaporator; 8-a second fan; 9-gas-liquid separator.

Detailed Description

To make the purpose, technical solution and advantages of the present invention clearer, the following will combine the embodiments of the present invention and the corresponding drawings to clearly and completely describe the technical solution of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and 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.

According to the utility model discloses an embodiment provides a unit heats, as shown in figure 1 the utility model discloses a structural schematic of an embodiment of unit. This heating unit can include: the system comprises a compressor 1, a condenser 2, a reversing mechanism and two evaporators.

Optionally, the heating unit may include: at least one of a heat pump hot water unit and a heating air conditioning unit.

For example: it is also suitable for single heating air conditioner.

Therefore, through the heating units in various applicable occasions, the heating effect of the heating units is better, and the user experience is better.

In an alternative example, the condenser 2 and the reversing mechanism (for example, the exhaust pipe of the reversing mechanism and the suction pipe of the reversing mechanism) are sequentially adapted and connected to a refrigerant circulation loop between the exhaust end of the compressor 1 and the suction end of the compressor 1.

For example: the exhaust end of the compressor 1 is connected to an exhaust pipe of the reversing mechanism in an adaptive manner after passing through the condenser 2; and the air suction pipe of the reversing mechanism is connected to the air suction end of the compressor 1 in an adaptive mode.

Optionally, the reversing mechanism may include: and a four-way valve 3.

In an alternative embodiment, the exhaust pipe (i.e., D pipe) of the four-way valve 3 is adapted to be connected to the exhaust end of the compressor 1 via the condenser 2; and a suction pipe (i.e., an S pipe) of the four-way valve 3 is adapted to be connected to a suction end of the compressor 1.

Therefore, the reversing is performed through the four-way valve, the control mode is simple and convenient, and the reversing reliability is high.

In an alternative embodiment, when the two evaporators can include a first evaporator 4 and a second evaporator 7, a reversing tube (e.g., E tube) of the four-way valve 3 is adapted to be connected to the first evaporator 4. The other reversing tube (e.g., C tube) of the four-way valve 3 is adapted to be connected to the second evaporator 7.

For example: in the four connecting pipes (namely, the D pipe, the E pipe, the S pipe and the C pipe) of the four-way valve, the four connecting pipes are not randomly connected in pairs, and the structure determines that the D pipe of the four-way valve can only be connected with the E pipe of the four-way valve or the C pipe of the four-way valve, so that two heat exchangers (for example, two finned heat exchangers) can only be connected with the E pipe of the four-way valve and the C pipe of the four-way valve respectively.

From this, through the switching-over pipe and the evaporimeter adaptation connection of cross valve for the switching-over is more convenient, and mounting structure is simple.

In an optional example, the two evaporators are respectively connected to the refrigerant circulation pipeline in an adaptive manner through the reversing mechanism, and the two evaporators can be switched to defrost two heating modes through reversing of the reversing mechanism, so that the heating amount of the heating unit is constant when any one of the evaporators defrosts.

For example: a first heating mode: the high-temperature high-pressure gaseous refrigerant coming out of the compressor is changed into a medium-temperature high-pressure liquid (or vapor-liquid mixed) refrigerant after exchanging heat with water through the condenser, the medium-temperature high-pressure liquid (or vapor-liquid mixed) refrigerant is communicated to the first evaporator through the four-way valve, the first fan is kept closed at the moment, the medium-temperature refrigerant is further cooled (at the moment, if frost exists on the first evaporator, the medium-temperature refrigerant can be used for defrosting), the medium is changed into a low-temperature vapor-liquid mixed refrigerant after passing through the throttling element, flows through the second evaporator, the second fan is kept open at the moment, the refrigerant is evaporated at the moment to exchange heat with air, and finally.

For example: a second heating mode: the high-temperature high-pressure gaseous refrigerant coming out of the compressor is changed into a medium-temperature high-pressure liquid (or vapor-liquid mixed) refrigerant after exchanging heat with water through the condenser, the medium-temperature high-pressure liquid (or vapor-liquid mixed) refrigerant is communicated to the second evaporator through the four-way valve, the second fan keeps closed at the moment, the medium-temperature refrigerant is further cooled (at the moment, if frost exists on the second evaporator, the medium-temperature refrigerant can be used for defrosting), the medium-temperature high-pressure gaseous refrigerant passes through the throttling element, is changed into a low-temperature vapor-liquid mixed refrigerant, flows through the first evaporator, the first fan keeps open at the moment, and finally.

For example: the two evaporators are respectively and adaptively connected to the refrigerant circulation loop through corresponding reversing pipes of the reversing mechanism (for example, other connecting pipes except the exhaust pipe and the air suction pipe in a plurality of connecting pipes of the reversing mechanism). And by reversing the reversing mechanism, switching defrosting in two heating modes so as to make the heating amount of the condenser 2 constant in the defrosting process when any evaporator needs defrosting (for example, when any evaporator needs defrosting, using the heat of the refrigerant flowing out of the condenser 2 to defrost, and realizing the constant heating amount of the heating unit in the defrosting process).

For example: the connection mode of the four-way valve is adjusted, an E pipe of the four-way valve and a C pipe of the four-way valve are respectively connected with a fin heat exchanger, and the water temperature is constant in the defrosting process by changing the sequence of the refrigerant flowing through the two fins during defrosting.

For example: by adjusting the position of the four-way valve and adding a finned heat exchanger (if the shell is a side air outlet double-fan shell, the finned heat exchanger is not required to be added), the problem of water temperature fluctuation caused by a defrosting process is solved, and the heating comfort is improved; meanwhile, the temperature before throttling is reduced, refrigerant liquefaction is facilitated, the dryness and the temperature after throttling are reduced, and the evaporation heat exchange quantity is improved.

For example: the D-pipe (i.e., exhaust pipe) of the conventional four-way valve is connected to the exhaust port of the compressor, and the C-pipe of the four-way valve is connected to the condenser. The D pipe of the four-way valve is connected with a condenser, and the C pipe of the four-way valve and the S pipe of the four-way valve are respectively connected with two evaporators, so that the connection and defrosting switching of the four-way valve and the two evaporators are realized; and after the four-way valve is placed on the condenser, defrosting will not affect the heat exchange of the condenser, and finally the constant temperature of heat supply is realized.

For example: after the four-way valve is adjusted to the condenser, the exhaust gas firstly passes through the condenser to release heat at any time, the E pipe of the four-way valve and the S pipe of the four-way valve are respectively connected with a fin heat exchanger, the four-way valve is reversed, the refrigerant heat flowing out of the condenser is utilized to defrost, and the water temperature is constant in the defrosting process.

For example: the defrosting reversing does not involve the state change of the condenser, the air conditioner can heat as usual even if defrosting is carried out, and the heat output of the unit is constant.

Therefore, the reversing mechanism is arranged behind the condenser in the refrigerant circulation loop, and the two heat exchange modes are switched to defrost, so that on one hand, defrosting is reliably realized, on the other hand, the heating quantity of the condenser is kept, the operation reliability of the heating unit is good, and the user experience is good.

Alternatively, at least one of the condenser 2 and each of the evaporators may include: at least one of a fin heat exchanger, a microchannel heat exchanger, a double tube heat exchanger, and a shell and tube heat exchanger.

For example: the two heat exchangers can be fin heat exchangers, and can also be other heat exchangers, such as a micro-channel heat exchanger, a sleeve/shell and tube heat exchanger of a water source heat pump and the like.

Therefore, through the condensers and the evaporators in various forms, the heat exchange flexibility is better, and the use convenience is better.

Optionally, the two evaporators may include: a first evaporator 4 and a second evaporator 7.

For example: by utilizing the two fin heat exchangers, the water temperature is constant in the defrosting process, and the heating comfort is improved.

Therefore, the two evaporators are switched to defrost under the reversing of the reversing mechanism, the defrosting reliability is high, and the refrigerant circulation efficiency is high.

Alternatively, the layout structure of the first evaporator 4 and the second evaporator 7 may include: the structure comprises a split type independent structure and/or at least one integrated structure of an upper layered structure, a lower layered structure and a left layered structure and a right layered structure.

From this, through two evaporimeters that multiple form set up, occupation space is nimble adjustable, and the convenience that the user used is good.

Optionally, the air outlet manner of the integrated structure may include: at least one of side air outlet, upper air outlet and lower air outlet.

For example: referring to the examples shown in fig. 2 to 4, the first evaporator and the second evaporator may be arranged in an upper-lower layer, a left-right layer, or a split-type independent layer.

Therefore, the fan is more flexible and convenient to set through the air outlet modes in different forms.

In an alternative embodiment, the method may further include: a throttling element 6.

In an alternative example, the throttling element 6 is adapted to be connected to a refrigerant pipeline between two adjacent evaporators in the two evaporators so as to realize refrigerant throttling between the two adjacent evaporators in any one of the heating modes.

For example: in order to realize two in the evaporimeter under arbitrary heating mode adjacent two refrigerant throttle between the evaporimeter makes the refrigerant condensation before the throttle more abundant to make the refrigerant humidity after the throttle bigger, thereby promote two the heat exchange efficiency of evaporimeter.

Therefore, through the adaptive arrangement of the throttling element, the step-by-step heat exchange efficiency between the two evaporators is better, and the efficiency of the operation of the heating unit is favorably improved.

Alternatively, when the two evaporators may include a first evaporator 4 and a second evaporator 7, the throttling element 6 is adapted to be connected to a refrigerant pipeline between the first evaporator 4 and the second evaporator 7.

For example: the finned heat exchanger before throttling is used as a subcooler, so that the refrigerant is subcooled and is more fully condensed; the temperature is lower after throttling, and refrigerant humidity is bigger, promotes evaporimeter heat exchange efficiency.

From this, through setting up throttling element between two evaporimeters, make the heat exchanger before the throttle can the supercooling heat transfer, the heat exchanger after the throttle can the damp heat transfer, and then promotes the heat exchange efficiency of two heat exchangers for the operation of the unit that heats is more reliable, more high-efficient.

Alternatively, the throttling element 6 may comprise: at least one of an electronic expansion valve, a thermostatic expansion valve and a capillary tube.

Therefore, the throttling element in various forms enables the throttling arrangement to be more flexible and convenient.

In an alternative embodiment, the method may further include: two fans.

In an optional example, two fans are arranged to be matched with the two evaporators one by one.

Wherein each fan can be used for being closed when the evaporator matched with the fan is defrosted or being operated when the evaporator matched with the fan is not defrosted.

For example: and under any heating mode, the fan adaptive to the evaporator for defrosting is closed, and the fan adaptive to the evaporator for defrosting is operated.

From this, through the adaptation setting of fan, can promote heat exchange efficiency, and do not influence the normal frost, it is good to use the convenience, and the reliability is high.

Optionally, the two fans may include: a first fan 5 and a second fan 8.

From this, through two fans, can adapt to two evaporimeters respectively, it is good to use the convenience, and the reliability is high.

Alternatively, when the two evaporators may include a first evaporator 4 and a second evaporator 7, the first fan 5 is disposed to be matched with the first evaporator 4, and the second fan 8 is disposed to be matched with the second evaporator 7.

From this, through two fans and two evaporimeter adaptations settings, can close when defrosting, open when normal operating, control is convenient, and operational reliability is high.

In an alternative embodiment, the method may further include: a gas-liquid separator 9.

In an alternative example, the gas-liquid separator 9 is adapted to be connected between the suction end of the compressor 1 and the reversing mechanism.

For example: one end of the gas-liquid separator 9 is connected to the suction end of the compressor 1; the other end of the gas-liquid separator 9 is connected to a suction pipe (e.g., S pipe) of the four-way valve 3.

For example: the heat pump water heater unit comprises: the system comprises a compressor, a condenser (such as a sleeve type condenser, a shell and tube type condenser and the like), a four-way valve, a vapor-liquid separator, throttling elements (an electronic expansion valve, a thermal expansion valve, a capillary tube and the like), a first fin evaporator, a second fin evaporator, a first fan, a second fan, a pipeline and the like.

Therefore, through the adaptive arrangement of the gas-liquid separator, the refrigerant sucked by the suction end of the compressor is more reasonable in form, and the operation effect of the heating unit is favorably improved.

Through a large number of tests, the technical scheme of the embodiment is adopted, the E pipe of the four-way valve and the C pipe of the four-way valve are respectively connected with a heat exchanger (such as a fin heat exchanger, a micro-channel heat exchanger, a double-pipe heat exchanger, a shell-and-tube heat exchanger and the like) by adjusting the connection mode of the four-way valve, and the heating quantity is constant in the defrosting process (such as the water temperature of a heat pump hot water unit is constant in the defrosting process) by changing the sequence of the refrigerant flowing through the two fins.

According to the embodiment of the utility model, still provide the control method that corresponds to the heating unit (for example: the defrosting control method of a heating unit). Referring to fig. 5, a schematic flow diagram of an embodiment of the method of the present invention is shown. The control method of the heating unit may include: the heating unit comprises the heating unit, and whether defrosting is needed by any of the two evaporators is determined.

Optionally, the method for controlling the heating unit may further include: when it is determined that any evaporator needs defrosting, the heating mode which can defrost the evaporator is operated in the two heating modes through the reversing of the reversing mechanism.

In the heating mode capable of defrosting the evaporator, the refrigerant flow direction in the refrigerant circulation pipeline is as follows: the evaporator is firstly passed through, and then passed through the other evaporators except the evaporator in the two evaporators.

In an alternative example, when the reversing mechanism includes a four-way valve 3 and the two evaporators include a first evaporator 4 and a second evaporator 7, determining whether defrosting is required for any one of the two evaporators may include: it is determined whether the first evaporator 4 or the second evaporator 7 needs defrosting (e.g., it is determined whether the current frosting degree of the first evaporator 4 or the second evaporator 7 reaches a set defrosting condition), see step S110 in fig. 5.

For example: an inlet pipe temperature detection device is installed on the first evaporator 4 and the second evaporator 7, and the heat exchange difference value of the ambient temperature and the inlet pipe temperature is used as the evaporator heat exchange temperature difference value to represent the frosting degree. The heat exchange temperature difference increases after frosting, and the frosting time and the heat exchange temperature difference are used as conditions for entering defrosting, the frosting time is calculated immediately after the corresponding fan is started, and the heat exchange temperature difference condition is slowly reduced along with the lengthening of the frosting time. If the frosting time is 30 minutes, the heat exchange temperature difference is required to be more than or equal to 18 ℃; when the frosting time is as long as 60 minutes, the heat exchange temperature difference is required to be reduced by 15 ℃; when the frosting time is 120 minutes, the heat exchange temperature difference is required to be reduced to 10 ℃. Therefore, the frosting is serious in a high-humidity area, the heat exchange temperature difference is reduced quickly, and the unit can defrost quickly; in a frost-free area, the frosting is slight, the change of heat exchange temperature difference is small, the frosting time can be prolonged, and the defrosting frequency is reduced.

Accordingly, when it is determined that any one of the evaporators needs defrosting, the operating of the heating mode, which enables the evaporator to defrost, of the two heating modes by reversing the reversing mechanism may include: when it is determined that the first evaporator 4 needs defrosting (for example, when it is determined that the current frosting degree of the first evaporator 4 reaches the set defrosting condition), a first heating mode of the heating unit is operated by switching of the four-way valve 3, see step S120 in fig. 5.

For example: when the first evaporator is detected to meet the defrosting condition, the four-way valve is reversed to be switched to the first heating mode.

Optionally, in the first heating mode, a refrigerant flow direction in the refrigerant circulation line is: first through the first evaporator 4 and then through the second evaporator 7.

Optionally, when it is determined that any one of the evaporators needs defrosting, the reversing mechanism is used for reversing to operate a heating mode capable of defrosting the evaporator in the two heating modes, and the method may further include: when it is determined that the second evaporator 7 needs defrosting, the four-way valve 3 is switched to operate the second heating mode of the heating unit, referring to step S130 in fig. 5.

For example: when the second evaporator is detected to meet the defrosting condition, the four-way valve is reversed to be switched to a second heating mode.

Optionally, in the second heating mode, the refrigerant flow direction in the refrigerant circulation line is: the wire passes through the second evaporator 7 and then through the first evaporator 4.

In an alternative embodiment, the method may further include: when the heating unit may further include a throttling element 6, throttling of the refrigerant between the first evaporator 4 and the second evaporator 7 is achieved through the throttling element 6.

In an alternative embodiment, the method may further include: when the heating unit may further include a first fan 5 and a second fan 8, in the first heating mode, the first fan 5 is turned off, and the second fan 8 is operated; or, in the second heating mode, the first fan 5 operates, and the second fan 8 is turned off.

Since the processing and functions implemented by the method of this embodiment substantially correspond to the embodiments, principles, and examples of the set shown in fig. 1 to fig. 4, the description of this embodiment is not detailed, and reference may be made to the related descriptions in the foregoing embodiments, which are not described herein again.

Through a large number of tests, the technical scheme of the utility model is adopted, the water temperature fluctuation caused by the defrosting process is solved by adjusting the position of the four-way valve and adding one fin heat exchanger (if the side air outlet double-fan shell is adopted, the fin heat exchanger is not needed to be added), and the heating comfort is improved; meanwhile, the temperature before throttling is reduced, refrigerant liquefaction is facilitated, the dryness and the temperature after throttling are reduced, and the evaporation heat exchange quantity is improved.

In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.

The above description is only an example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A heating unit, comprising: the device comprises a compressor (1), a condenser (2), a reversing mechanism and two evaporators; wherein,

the condenser (2) and the reversing mechanism are sequentially connected in a refrigerant circulation loop between the exhaust end of the compressor (1) and the suction end of the compressor (1) in a matched manner;

the two evaporators are respectively connected to the refrigerant circulating pipeline in an adaptive mode through the reversing mechanism and used for realizing the switching defrosting of the two heating modes through the reversing of the reversing mechanism.

2. The assembly according to claim 1, further comprising: a throttling element (6);

the throttling element (6) is connected to a refrigerant pipeline between two adjacent evaporators in the two evaporators in an adaptive manner, so that the refrigerant throttling between the two adjacent evaporators in any heating mode is realized.

3. The assembly according to claim 1, further comprising: two fans;

the two fans are matched with the two evaporators one by one;

wherein,

each fan is used for being turned off when the evaporator matched with the fan is defrosted or being operated when the evaporator matched with the fan is not defrosted.

4. The assembly according to any one of claims 1 to 3, further comprising: a gas-liquid separator (9);

and the gas-liquid separator (9) is connected between the suction end of the compressor (1) and the reversing mechanism in an adaptive manner.

5. Assembly according to one of claims 1 to 3, wherein,

two said evaporators, comprising: a first evaporator (4) and a second evaporator (7);

and/or the presence of a gas in the gas,

the reversing mechanism comprises: a four-way valve (3);

and/or the presence of a gas in the gas,

when the assembly further comprises a throttling element (6), said throttling element (6) comprises: at least one of an electronic expansion valve, a thermostatic expansion valve and a capillary tube;

and/or the presence of a gas in the gas,

when this unit still includes two fans, two the fan includes: a first fan (5) and a second fan (8).

6. The aggregate according to claim 5,

a reversing pipe of the four-way valve (3) is connected to the first evaporator (4) in an adaptive manner; the other reversing pipe of the four-way valve (3) is connected to the second evaporator (7) in a matching way;

and/or the presence of a gas in the gas,

the throttling element (6) is connected to a refrigerant pipeline between the first evaporator (4) and the second evaporator (7) in a matching mode;

and/or the presence of a gas in the gas,

the first fan (5) is matched with the first evaporator (4), and the second fan (8) is matched with the second evaporator (7).

7. The plant according to claim 5, characterized in that the layout structure of said first evaporator (4) and said second evaporator (7) comprises:

the structure comprises a split type independent structure and/or at least one integrated structure of an upper layered structure, a lower layered structure and a left layered structure and a right layered structure.

8. The assembly of claim 7, wherein the air outlet means of the integrated structure comprises: at least one of side air outlet, upper air outlet and lower air outlet.

9. Assembly according to one of claims 1 to 3,

the heating unit includes: at least one of a heat pump hot water unit and a heating air conditioning unit;

and/or the presence of a gas in the gas,

at least one of the condenser (2), each of the evaporators, comprising: at least one of a fin heat exchanger, a microchannel heat exchanger, a double tube heat exchanger, and a shell and tube heat exchanger.