WO2018094841A1

WO2018094841A1 - Air conditioner and refrigeration control method therefor

Info

Publication number: WO2018094841A1
Application number: PCT/CN2016/113564
Authority: WO
Inventors: 韦汉儒; 李金波; 李杏党; 杨晓东
Original assignee: 广州华凌制冷设备有限公司; 美的集团股份有限公司
Priority date: 2016-11-28
Filing date: 2016-12-30
Publication date: 2018-05-31
Also published as: CN106403348A; CN106403348B

Abstract

An air conditioner, comprising: a compressor (7), an indoor heat exchanger (1) and an outdoor heat exchanger (2) connected by pipelines to form a loop, wherein a throttling device (4) is connected between the indoor heat exchanger (1) and the outdoor heat exchanger (2); a pipe between the outdoor heat exchanger (2) and the throttling device (4) is connected in parallel with any number of bypass branches (5); each bypass branch (5) is successively provided with a first switch valve (51) and a refrigerant storage (52). Also provided is a refrigeration control method for the air conditioner. When a high pressure value of the refrigerant in the air conditioner is too high, redundant refrigerant in a refrigeration loop of the air conditioner is stored by a bypass branch to reduce the pressure of refrigerant in the refrigeration loop until the high pressure value of the refrigerant meets requirements so that the air conditioner can normally refrigerate in high temperature and even super-high temperature environment, thereby effectively solving the problem that users cannot refrigerate in high temperature.

Description

Air conditioner and cooling control method thereof

Cross-reference to related applications

The present application claims the priority of the Chinese Patent Application, filed on Nov. 28,,,,,,,,,,,,,,,,,

Technical field

The present invention relates to the field of air conditioning technology, and in particular, to an air conditioner and a cooling control method thereof.

Background technique

The traditional T3 air conditioner runs at a maximum temperature of 52 ° C. Generally, the air conditioner manufacturer will keep a design of 2 to 3 ° C, which means that the maximum operating temperature of the air conditioner is about 55 ° C. But even with such a margin, after the product is installed in the user's home, there are still frequent failures and the maintenance rate remains high. Especially in the Middle East, the environment is relatively harsh. When the weather temperature is about 45 °C, the temperature of the air after exposure to the outside can often be as high as 60 °C or even 67 to 68 °C. In this kind of temperature environment, the conventional T3 working condition air conditioner has long been protected from shutdown due to high temperature, high pressure and high current, and even burned out at high temperature. Therefore, for the user, the higher the temperature requires a colder temperature, the air conditioner is protected from shutdown and cannot be cooled.

Summary of the invention

(1) Technical problems to be solved

The object of the present invention is to provide an air conditioner and a cooling control method thereof, which solve the problem that the conventional cooling cannot be normally cooled in a high temperature environment.

(2) Technical plan

In order to solve the above technical problems, the present invention provides an air conditioner comprising: a compressor, an indoor heat exchanger and an outdoor heat exchanger formed by a pipeline connection, wherein the indoor heat exchanger and the outdoor heat exchanger There is a throttling device connected between the outdoor heat exchanger and the The pipe sections between the throttling devices are connected in parallel with any bypass bypass branches, and each of the bypass branches is provided with a first switching valve and a refrigerant in the direction of the throttling device along the outdoor heat exchanger. Memory.

Preferably, the compressor is connected to the indoor heat exchanger and the outdoor heat exchanger through a reversing device; the bypass branch is further provided with a one-way shut-off valve, so that the first on-off valve and the refrigerant storage And a one-way shut-off valve is sequentially disposed along the outdoor heat exchanger in a direction toward the throttling device, and the one-way shutoff valve is electrically connected to the throttling device along the outdoor heat exchanger.

Preferably, the compressor is a two-cylinder variable-capacity compressor, including a large cylinder and a small cylinder; the reversing device is a four-way valve, and a return air inlet of the large cylinder and a return air inlet of the small cylinder respectively pass through one A second switching valve is coupled to the outlet of the four-way valve.

Preferably, the number of the bypass branches is two or more, and all of the bypass branches are connected in parallel and/or in series.

Preferably, the throttling device is a thermal expansion valve or an electronic expansion valve.

The present invention also provides an air conditioner comprising: a compressor that forms a loop through a pipeline connection, an indoor heat exchanger, and an outdoor heat exchanger, wherein the indoor heat exchanger and the outdoor heat exchanger are connected a throttle device, a pipe branch between the outdoor heat exchanger and the throttle device is connected in parallel with any branch bypass branch, and each of the bypass branches is connected with an adjustable refrigerant storage, the adjustable refrigerant The memory includes a cylindrical housing placed vertically, and a plug member disposed within the cylindrical housing and reciprocable along an axial direction of the cylindrical housing, the plug member and the cylindrical housing The inner side wall of the body is sealed, and a working chamber is formed between the active surface of the plug member and the cylindrical housing; the cylindrical housing is provided with a liquid inlet and a row communicating with the liquid storage chamber a liquid port, the liquid inlet is connected to the outdoor heat exchanger, the liquid discharge port is connected to the throttle device; the plug member is connected with an elastic member disposed along a moving direction of the plug member, when The plug member moves under refrigerant pressure to make the reservoir volume and the reservoir Refrigerant gravity change, the deformable elastic member to adjust the balance of the plug member.

The invention also provides a cooling control method for an air conditioner, comprising the following steps:

S1, turning on the compressor, switching the air conditioner to the cooling operation mode, so that the refrigerant enters the throttle device from the outlet of the outdoor heat exchanger;

S2, measuring the high pressure air conditioner refrigerant _real value P, P and P and _set _{the real} comparison, wherein, when P is _set equal to the cooling state of the air conditioner allowable maximum value of the high pressure refrigerant:

If P _real ≤P _set, the air conditioner to maintain the current running state;

If the _solid P> P _{is provided,} through the bypass branch flows of refrigerant from the expansion device outdoor heat exchanger stored until P P is not larger than _{the real} air conditioner _{is provided} to maintain the current state of running; if the bypass branch storage after saturation is still greater than P P _solid _set, the process proceeds to S3;

S3. Determine the type of compressor:

If the compressor is a variable displacement compressor cylinder, by switching the operation mode of the compressor is reduced P _solid until _{the solid} is not greater than P P _provided; or if small if the cylinder-cylinder operating state in the variable displacement compressor, still _solid P _set larger than P, then the air conditioner switch to blowing mode;

If the compressor is a single-cylinder compressor, switch the air conditioner directly to the air supply mode.

Preferably, the method further includes: S4, the throttle device automatically adjusts the opening degree by judging the return air superheat degree of the compressor, so that the air conditioner is always in an optimal running state;

When the throttling device is an electronic expansion valve, it includes:

S401. Measure the actual intake air temperature T _s of the compressor, and make a difference between the actual intake air temperature T _s of the compressor and the set suction air temperature T _{0 of} the compressor, and obtain the return air superheat degree of the compressor ΔT= T _s -T ₀ ;

S402. Determine the size of ΔT:

If ΔT<-1, reduce the opening of the electronic expansion valve;

If ΔT>1, increase the opening of the electronic expansion valve;

If -1 ≤ △T ≤ 1, the current electronic expansion valve opening is kept unchanged.

Preferably, in S2, a first switching valve, a refrigerant reservoir and a one-way shut-off valve are sequentially connected in series on the bypass branch, and the first switching valve is located in the refrigerant reservoir near the chamber One side of the outer heat exchanger, the one-way shutoff valve is conductive along the outdoor heat exchanger in a direction to the throttling device;

When it is necessary to store the refrigerant through the bypass branch, the first on-off valve is opened such that the refrigerant flows into the refrigerant reservoir.

Preferably, in S3, if the compressor is a two-cylinder variable capacity compressor, comprising:

S301. Switching the compressor from the two-cylinder operating state to the large-cylinder operating state, and determining the relationship between the P _real and the P _setting after the operation is stable:

If the _solid P> P _set, the compressor will be switched from the operating state to a small vat cylinder operating state;

S302. In the small cylinder running state, determine the relationship between the P _real and the P _setting :

If P _is _{set to} P, the air conditioner is switched to the air supply mode.

(3) Beneficial effects

The technical solution of the present invention has the following advantages: the air conditioner of the present invention, the pipe section between the outdoor heat exchanger and the throttling device is connected in parallel with any branch bypass branch, and each of the bypass branches is along the The outdoor heat exchanger is provided with a first switching valve and a refrigerant reservoir in this order in the direction of the throttling device. In the air conditioner, when the high pressure value of the refrigerant in the air conditioner is too high, the excess refrigerant in the air conditioner refrigeration circuit is stored through the bypass branch to reduce the pressure of the refrigerant in the refrigeration circuit until the high pressure of the refrigerant The value meets the requirements. Therefore, the air conditioner can be normally cooled in a high temperature or even an ultra high temperature environment, effectively solving the problem that the user cannot cool at a high temperature.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a schematic structural view of an air conditioner according to Embodiment 1;

Figure 2 is a schematic structural view of still another air conditioner of the first embodiment;

3 is a schematic structural view of an air conditioner of Embodiment 2;

4 is a schematic structural view of an adjustable refrigerant memory in the second embodiment;

5 is a schematic flow chart of a cooling control method of an air conditioner according to Embodiment 3;

In the figure: 1, indoor heat exchanger; 2, outdoor heat exchanger; 3, reversing device; 4, throttling device; 5, bypass branch; 51, first switching valve; 52, refrigerant storage; , cylindrical housing; 522, plug component; 523, liquid storage chamber; 524, liquid inlet; 525, liquid discharge port; 526, adjustment chamber; 527, elastic member; 53, one-way shut-off valve; On-off valve; 7, compressor.

detailed description

Embodiments of the present invention will be further described in detail below with reference to the drawings and embodiments. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it is to be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", " The orientation or positional relationship of the indications of "upright", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and The simplification of the description is not intended to limit or imply that the device or component that is referred to has a particular orientation, is constructed and operated in a particular orientation, and thus is not to be construed as limiting. Moreover, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that the terms "connected" and "connected" are to be understood broadly, and may be, for example, a fixed connection, a detachable connection, or an integral, unless otherwise explicitly defined and defined. Ground connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood in a specific case by those skilled in the art.

Embodiment 1

Referring to FIG. 1, the air conditioner of the first embodiment includes: forming a back through a pipeline connection. a compressor 7 for the road, an indoor heat exchanger 1 and an outdoor heat exchanger 2, wherein a throttle device 4 is connected between the indoor heat exchanger 1 and the outdoor heat exchanger 2, and the outdoor heat exchanger 2 and The branch sections between the throttling devices 4 are connected in parallel with any bypass bypass branches 5, and each of the bypass branches 5 is sequentially disposed along the outdoor heat exchanger 2 in the direction of the throttling device 4 The first switching valve 51 and the refrigerant reservoir 52.

It should be noted that the air conditioner of the first embodiment is mainly for realizing normal cooling in a high temperature environment, and the bypass branch 5 is provided to adjust the refrigerant in the air conditioner refrigeration circuit in a high temperature environment. Therefore, it is understood that the air conditioner of the present embodiment only needs to have a cooling function.

Therefore, although the air conditioner of Fig. 1 is provided with the reversing device 3, the reversing device 3 is not a structure that the air conditioner must have, and should not constitute a limitation of the present application. And the arrangement of the reversing device 3 is such that the air conditioner can also heat the air conditioner by changing the flow direction of the refrigerant on the basis of the refrigeration function.

Further, in conjunction with FIG. 1, the refrigerant enters the pipe section between the outdoor heat exchanger 2 and the throttling device 4 after passing through the outdoor heat exchanger 2 while the air conditioner is cooling. When the high pressure refrigerant pressure P in the air conditioner is not greater than _{the solid} allowed when the cooling state of the high-pressure refrigerant in the maximum _set pressure value P, the first switching valve 51 is turned off, thereby disconnecting the bypass branch 5. At this time, the refrigerant flows out of the outdoor heat exchanger 2 and then flows into the expansion device 4. When the high pressure refrigerant pressure P is greater than _{the solid} state of the air conditioner is under the maximum permissible cooling of the refrigerant high-side pressure _set value P, this time at least a first switching valve 51 is turned, so that access to at least one bypass branch 5 , so that the refrigerant circuit of excess refrigerant enters into the refrigerant reservoir 52 until the high pressure refrigerant P _solid high-pressure refrigerant equal to the maximum pressure value P _set.

Here, the refrigerant high pressure P _actually refers to the pressure between the outlet of the outdoor heat exchanger 2 and the inlet of the expansion device 4 in the air conditioner cooling state. Obviously, the present embodiment is a high pressure refrigerant P to determine _{the real} amount and pressure of the refrigerant in the refrigerant circuit to meet the requirements. Of course, other reference quantities having equivalent meanings may be used to determine the refrigerant amount and pressure in the refrigeration circuit, and based on the determination, the on/off of the first switching valve 51 is controlled. Similarly, the adjustment of the refrigerant high pressure P in the following _is actually to make the refrigeration circuit work under certain conditions.

When the compressor 7 is connected to the indoor heat exchanger 1 and the outdoor heat exchanger 2 through the reversing device 3, that is, the structure of the air conditioner described in FIG. 1, it can be seen from the above description that in this case, the air conditioner The device can be used to heat. In order to avoid heating, the refrigerant enters the bypass branch 5 and is stored, so that the refrigerant in the heating circuit is insufficient. At this time, the bypass branch 5 is also provided on the bypass branch 5. The first switching valve 51, the refrigerant storage 52, and the one-way shutoff valve 53 are sequentially disposed along the outdoor heat exchanger 2 in the direction of the throttle device 4, and the one-way shutoff valve 53 is along the The outdoor heat exchanger 2 is turned on in the direction of the expansion device 4. By providing the above-described one-way shutoff valve 53, the line from the throttle device 4 to the refrigerant accumulator 52 is disconnected, so that the bypass branch 5 is in an open state during heating, thereby avoiding the influence of the heating effect.

Further, in the first embodiment, the compressor 7 is preferably a two-cylinder variable-capacity compressor 7, so that the refrigerant amount in the refrigeration circuit can be assisted by controlling the operation mode of the compressor 7. Among them, it is preferable that the compressor 7 includes a large cylinder and a small cylinder such that the compressor 7 includes a large cylinder operation mode, a small cylinder operation mode, and a two cylinder operation mode. When the high pressure of the refrigerant in the refrigeration circuit is made to meet the set demand by the bypass branch 5, the compressor 7 is operated in the twin-cylinder operation mode. When the refrigerant high pressure regulation requirement in the refrigerant circuit cannot be satisfied by the bypass branch 5, the compressor 7 can be operated in the large cylinder operation mode or even the small cylinder operation mode at this time, thereby reducing the amount of refrigerant entering the refrigeration circuit. .

On the basis that the air conditioner is provided with the reversing device 3, it is preferable that the reversing device 3 is a four-way valve. At this time, the air return port of the large cylinder and the air return port of the small cylinder may be connected to the outlet of the four-way valve through a second switching valve 6, respectively. Thereby, the operation mode of the compressor 7 is controlled by controlling the on and off of the second switching valve 6.

It should be noted that the above-mentioned "the pipe section between the outdoor heat exchanger 2 and the throttling device 4 has any branch bypass branch 5 in parallel" refers to the connection between the pipe section and the bypass branch 5. The mode is parallel, but when the number of bypass branches 5 is multiple, the bypass branches 5 can be It can also be connected in parallel in series.

For example, as can be seen from Fig. 1, the number of bypass branches 5 is two, and the two bypass branches 5 are connected in parallel, so that two-stage adjustment of the refrigeration circuit can be realized. When one bypass branch 5 is sufficient to bring the refrigerant circuit to equilibrium, there is no need to turn on another bypass branch 5. Otherwise, the two bypass branches 5 can be turned on in sequence. Of course, it should be noted that FIG. 1 does not constitute a limitation of the present application, and the number of the bypass branches 5 may be one or more than three.

For example, in FIG. 2, a plurality of bypass branches 5 are connected in series, and the bypass branches 5 are connected to the pipe sections between the outdoor heat exchanger 2 and the expansion device 4 in parallel. Alternatively, when the bypass branch 5 is three or more, the bypass branches 5 may be connected in series or in parallel, and the view is not given here.

It should be noted that the throttling device 4 of the first embodiment is not limited in form, and an electronic expansion valve or a thermal expansion valve is included in the protection scope of the present application. Further, in the refrigerant storage 52 of the first embodiment, a container of any shape can be selected as long as it has a storage capacity.

Embodiment 2

The air conditioner of the second embodiment, referring to FIG. 3, differs from the first embodiment in the specific structure of the bypass branch 5, which is not provided with the first on-off valve 51 and the one-way stop valve 53, and the refrigerant storage. 52 takes the form of an adjustable refrigerant reservoir 52. Other structures are the same as those in the first embodiment, and therefore will not be described herein.

Referring further to FIG. 4, the adjustable refrigerant reservoir 52 includes a cylindrical housing 521 placed vertically, and an axial direction disposed within the cylindrical housing 521 and along the cylindrical housing 521. A reciprocating plug member 522 that seals with an inner side wall of the cylindrical housing 521 and a reservoir 523 formed between the active surface of the plug member 522 and the cylindrical housing 521 The cylindrical housing 521 is provided with a liquid inlet 524 and an inlet and outlet port 525 communicating with the liquid storage chamber 523, and the liquid inlet 524 is connected to the outdoor heat exchanger 2, the row and the row a liquid port 525 is coupled to the throttling device 4; the plug member 522 is along the plug The elastic member 527 of the moving direction of the member 522 is connected, and when the plug member 522 moves under the pressure of the refrigerant to change the volume of the liquid storage chamber 523 and the gravity of the refrigerant in the liquid storage chamber 523, the elastic member 527 is deformed to adjust The balance of the plug member 522.

It should be noted that the initial position of the plug member 522 of the adjustable refrigerant reservoir 52 is close to the top of the cylindrical housing 521, and the volume of the reservoir 523 is very small, so that the reservoir 523 can be regarded as an access air conditioner. The refrigerant pipe section; even, the initial position of the plug member 522 can withstand the top of the cylindrical casing 521, so that the adjustable refrigerant reservoir 52 can be regarded as an open circuit at this time, so that the entire bypass branch 5 can be regarded as An open circuit. Also, when the air conditioner is heated, since the pressure value of the refrigerant flowing out from the throttle device 4 is already very low, it is impossible to move the plug member 522, so that the bypass branch 5 at this time is based on the initial position of the plug member 522. The design can be seen as a flow line or an open circuit. That is, the bypass branch 5 in the second embodiment does not affect the heating of the air conditioner.

Only when the air conditioner is in the cooling mode, the refrigerant high pressure is too high, at this time, the compression pressure difference is generated on the upper and lower sides of the plug member 522 of the adjustable refrigerant reservoir 52, and the plug member 522 moves downward under the refrigerant pressure. The volume of the liquid storage chamber 523 is increased, so that a part of the refrigerant in the refrigeration circuit is stored in the liquid storage chamber 523, and the pressure of the refrigerant in the air conditioner circuit is lowered until the high pressure value of the refrigerant meets the requirement, and the plug member 522 is at this time. Achieve balance. Especially when the air conditioner is cooled in a high temperature or ultra high temperature environment, the refrigerant from the outdoor heat exchanger 2 has a high pressure, and at this time, the refrigerant release pressure can be effectively stored by the adjustable refrigerant reservoir 52. The problem that the user cannot cool at high temperatures. Further, on the basis that the liquid storage chamber 523 stores the refrigerant, if the high pressure of the refrigerant is too low, the liquid storage chamber 523 can release a part of the refrigerant into the air conditioner circuit.

Referring to FIG. 4, in the second embodiment, the cylindrical housing 521 includes a top plate and a bottom plate, so that the plug member 522 separates the inner cavity of the cylindrical housing 521 into the adjustment chamber 526 and the liquid storage chamber 523, and The reservoir 523 is located above the conditioning chamber 526. Of these, it is preferred, but not necessary, to evacuate the conditioning chamber 526 to avoid a change in air pressure in the conditioning chamber 526 during movement of the plug member 522. Alternatively, it is also possible to make the adjustment chamber 526 and large The air is connected to ensure that the air pressure in the adjustment chamber 526 is stable.

On the basis of the above, it is preferable that the elastic member 527 is located in the adjustment chamber 526. Wherein, the bottom end of the elastic member 527 is fixed on the bottom plate of the adjustment chamber 526, and the top end supports the plug member 522. Thus, when the high pressure of the refrigerant is excessively high, the plug member 522 moves downward and compresses the elastic member 527 until the high pressure of the refrigerant satisfies the set requirement, at which time the plug member 522 reaches equilibrium. Of course, if the elastic member 527 meets the specific requirements, it can also be disposed in the liquid storage chamber 523, but in this case, not only the protection of the elastic member 527 is disadvantageous, but also the adjustment range of the volume of the liquid storage chamber 523 is also affected.

A spring may be selected as the elastic member 527 in the second embodiment from the drawings. When the plug member 522 is balanced, the force relationship is neglected: mg+V*ρg+F=k*s, where mg refers to the gravity of the plug member 522, which is a constant value; The volume corresponding to the portion for storing the refrigerant after removing the portion for circulating the refrigerant in the chamber 523; ρ refers to the density of the refrigerant; and F refers to the pressure generated by the flowing refrigerant to the plug member 522; *s is the spring force of the spring obtained by Hooke's law, where k is the spring constant of the spring and s is the amount of deformation of the spring.

Deformation of the above formula yields V*ρg=k*s-mg-F, since mg is a constant value, and when the plug member 522 is balanced, the high pressure of the flowing refrigerant reaches a set value, so that F is also a constant value. Therefore, V*ρg=k*s'. Where V = A * s', A is the cross-sectional area of the cylindrical casing 521. Therefore, in the case where the cylindrical housing 521 is determined, in order to ensure that the adjustable refrigerant reservoir 52 can adjust the high pressure of the refrigerant in the air conditioner line, the spring k can be obtained.

Of course, the elastic member 527 of the second embodiment may also be in other forms than the spring.

Moreover, the specific form of the plug member 522 of the second embodiment is not limited by the drawings, and it may be in the form of a partition plate in FIG. 2, or may be in the form of a plunger or a piston. Among them, the form structure of the partition plate is simple and the manufacturing cost is low, but the sealing property may be inferior; and the form of the plunger and the piston, although the sealing property is good, the manufacturing cost is higher.

In addition, the cylindrical housing 521 may have a circular, square, triangular, etc. cross section. Meaning shape.

Embodiment 3

According to the air conditioner of the above embodiment, the third embodiment provides a cooling control method for an air conditioner, comprising the following steps:

S1, the compressor 7 is turned on, the air conditioner is switched to the cooling operation mode, so that the refrigerant enters the throttle device 4 from the outlet of the outdoor heat exchanger 2;

If P _is _{set to} P, the refrigerant flowing from the outdoor heat exchanger 2 to the throttling device 4 is stored by the bypass branch 5 until the P _is not greater than the P _setting , and the air conditioner maintains the current state; if bypassed after the branch 5 stores a saturation greater than P P _solid still _set, the process proceeds to S3;

S3. Determine the type of the compressor 7:

If the compressor 7 is a variable displacement compressor cylinder 7, by switching the operation mode of the compressor is reduced P 7 _solid until _{the solid} is not greater than P P _set; or, if the variable displacement compressor cylinder 7 in a low-cylinder operating state If the P _is still greater than the P _setting , the air conditioner is switched to the air supply mode;

If the compressor 7 is a single cylinder compressor 7, the air conditioner is directly switched to the air supply mode.

When there are a plurality of bypass branches 5, the bypass branches 5 are connected one by one into the refrigeration circuit until the refrigerant amount in the refrigeration circuit satisfies the requirements, or until all the bypass branches 5 have been stored saturated. Wherein, the bypass branch 5 stores saturation refers to a state in which the pressure of the refrigerant reservoir 52 and the outlet pressure of the outdoor heat exchanger 2, that is, the refrigerant high pressure are balanced, at which time the refrigerant is no longer stored in the refrigerant reservoir 52. Instead, it flows along the bypass branch 5 to the throttling device 4.

The bypass branch 5 can obviously adopt the structural form of the first embodiment, and can also adopt the structural form of the second embodiment.

When using a bypass branch of Example 5, which requires a sensor measuring the pressure P _solid high-pressure refrigerant, thereby the magnitude relation between P and P _provided the _real determination, and controls the first switching valve 51 based on the determination result through Broken. Only in the case of _solid P> P _set, opening the first switch valve 51 to turn on the bypass branch 5. Obviously, in the case of the refrigeration control method in this case, although the refrigerant reservoir 52 in the bypass branch 5 has a simple structure, it is necessary to provide a sensor and a control unit.

When the bypass branch 5 of the second embodiment is used, since the adjustable refrigerant reservoir 52 of the bypass branch 5 can control the on/off of the bypass branch 5 according to the P _real control, the on/off of the bypass branch 5 is controlled, so Set up the sensor and control unit. However, in this case, the structure of the adjustable refrigerant reservoir 52 is relatively complicated.

As can be seen from the above description, the bypass branch 5 plays a major role in regulating the amount of refrigerant in the refrigeration circuit. When all the bypass branches 5 are insufficient so that the refrigerant high pressure meets the requirements, the auxiliary adjustment can be performed by switching the operation mode of the compressor 7.

Specifically, if the compressor 7 in S3 is a two-cylinder variable-capacity compressor 7, S3 further includes:

S301, the compressor 7 is switched from the two-cylinder operating state to the large-cylinder operating state, and the relationship between the P _real and the P- _{setting is} determined after the operation is stable:

If the _solid P> P _set, vat 7 is switched from the operating state to the operating state will be a small cylinder of the compressor;

If P _is _{set to} P, the air conditioner is switched to the air supply mode.

On the basis of the above, the method of the third embodiment further includes S4, and the throttle device 4 automatically adjusts the opening degree by judging the return air superheat of the compressor 7, so that the air conditioner is always in an optimal operating state.

Obviously, the opening adjustment of the throttle device 4 is accompanied by the entire operation process of the air conditioner. Although it is S4, it does not mean that there is a sequential relationship with S1-S3 in time.

Moreover, when the throttle device 4 is an electronic expansion valve, it includes:

S401, the actual measurement of the compressor 7 intake temperature T _s, the actual intake air temperature T _s of the compressor 7 intake air compressor 7 is set to make the difference between a temperature T _0, the return air is obtained through the compressor 7 Heat ΔT=T _s -T ₀ ;

S402. Determine the size of ΔT:

If △T<-1, the refrigerant flow rate of the refrigeration system is too large, the evaporation temperature is low, and the opening degree of the electronic expansion valve is adjusted to a small level;

If △T>1, it indicates that the refrigerant flow rate of the refrigeration system is too small, the evaporation temperature is high, and the opening degree of the electronic expansion valve is adjusted to one level;

If -1 ≤ △T ≤ 1, it indicates that the current refrigeration system is in good operating condition and keeps the current electronic expansion valve opening unchanged.

Among them, an execution period t can be set so that the magnitude of the return air superheat degree ΔT is judged every time t, and the electronic expansion valve opening degree is adjusted according to each judgment.

Of course, if the throttle device 4 is a thermal expansion valve, it can also adjust its own opening degree by judging the degree of return air superheat of the compressor 7.

When the number of the bypass branches 5 is two, and the compressor 7 is the two-cylinder variable-capacity compressor 7, the process of the air-conditioning refrigeration control method is shown in FIG. Further, although not shown in Fig. 5, the opening degree adjustment process of the throttle device 4 runs through the entire refrigeration process. For example, the opening degree of the throttle device 4 can be adjusted by judging the return air superheat degree ΔT of the compressor 7 each time before the relationship between the P _real and the P _{set is} judged in FIG. Of course, it is also possible to adjust the opening degree of the throttle device 4 by judging the return air superheat degree ΔT of the compressor 7 after each time the relationship between the P real and the P set is judged.

The above embodiments are merely illustrative of the invention and are not intended to limit the invention. While the invention has been described in detail herein with reference to the embodiments of the embodiments of the present invention Within the scope of the claims of the present invention.

Industrial applicability

The air conditioner and the refrigeration control method thereof, wherein the pipe section between the outdoor heat exchanger of the air conditioner and the throttle device is connected in parallel with any branch bypass branch, and each of the bypass branches The outdoor heat exchanger is provided with a first switching valve and a refrigerant reservoir in this order in the direction of the throttling device. In the air conditioner, when the high pressure value of the refrigerant in the air conditioner is too high, the excess refrigerant in the air conditioner refrigeration circuit is stored through the bypass branch to reduce the pressure of the refrigerant in the refrigeration circuit until the high pressure of the refrigerant The value meets the requirements. Therefore, the air conditioner can be normally cooled in a high temperature or even an ultra high temperature environment, effectively solving the problem that the user cannot cool at a high temperature. The air conditioning system meets the requirements of energy saving and environmental protection, and is easy to promote, so it is practical.

Claims

An air conditioner comprising: a compressor that forms a loop through a pipeline connection, an indoor heat exchanger, and an outdoor heat exchanger, wherein a throttle device is connected between the indoor heat exchanger and the outdoor heat exchanger, and features thereof Wherein, the pipe section between the outdoor heat exchanger and the throttling device is connected in parallel with any branch bypass branch, and each of the bypass branches is along the direction of the outdoor heat exchanger to the throttling device A first switching valve and a refrigerant reservoir are provided in sequence.
The air conditioner according to claim 1, wherein the compressor is connected to the indoor heat exchanger and the outdoor heat exchanger through a reversing device; and the bypass branch is further provided with a one-way stop valve. Having the first switching valve, the refrigerant reservoir, and the one-way shutoff valve sequentially disposed along the outdoor heat exchanger toward the throttling device, and the one-way shutoff valve is along the outdoor heat exchanger It is turned on in the direction of the throttle device.
The air conditioner according to claim 2, wherein the compressor is a two-cylinder variable-capacity compressor including a large cylinder and a small cylinder; the reversing device is a four-way valve, and a return port of the large cylinder And a return port of the small cylinder is connected to an outlet of the four-way valve through a second switching valve.
The air conditioner according to claim 1, wherein the number of the bypass branches is two or more, and all of the bypass branches are connected in parallel and/or in series.
The air conditioner according to claim 1, wherein the throttle device is a thermal expansion valve or an electronic expansion valve.
An air conditioner comprising: a compressor that forms a loop through a pipeline connection, an indoor heat exchanger, and an outdoor heat exchanger, wherein a throttle device is connected between the indoor heat exchanger and the outdoor heat exchanger, The utility model is characterized in that: the pipe section between the outdoor heat exchanger and the throttling device is connected in parallel with any branch bypass branch, and each of the bypass branches is connected with an adjustable refrigerant storage, the adjustable refrigerant The memory includes a cylindrical housing placed vertically, and a plug member disposed within the cylindrical housing and reciprocable along an axial direction of the cylindrical housing, the plug member and the cylindrical housing The inner side wall of the body is sealed, and a working chamber is formed between the active surface of the plug member and the cylindrical housing; the cylindrical housing is opened and a liquid inlet and a liquid discharge port connected to the liquid storage chamber, the liquid inlet is connected to the outdoor heat exchanger, and the liquid discharge port is connected to the throttle device; the plug member is along the plug An elastic member connection provided in a moving direction of the member, the elastic member deforming to adjust the balance of the plug member when the plug member moves under a refrigerant pressure to change a volume of the reservoir and a gravity of the refrigerant in the reservoir .
A cooling control method for an air conditioner, comprising the steps of:

S1, turning on the compressor, switching the air conditioner to the cooling operation mode, so that the refrigerant enters the throttle device from the outlet of the outdoor heat exchanger;

S2, measuring the high pressure air conditioner refrigerant real value P, P and P and set the real comparison, wherein, when P is set equal to the cooling state of the air conditioner allowable maximum value of the high pressure refrigerant:

If P real ≤P set, the air conditioner to maintain the current running state;

If the solid P> P is provided, through the bypass branch flows of refrigerant from the expansion device outdoor heat exchanger stored until P P is not larger than the real air conditioner is provided to maintain the current state of running; if the bypass branch storage It remains solid after the saturation P greater than P set, the process proceeds to S3;

S3. Determine the type of compressor:

If the compressor is a variable displacement compressor cylinder, by switching the operation mode of the compressor is reduced P solid until the solid is not greater than P P provided; or if small if the cylinder operating state in the variable displacement compressor cylinder, still solid P set larger than P, then the air conditioner is switched to blowing mode;

If the compressor is a single-cylinder compressor, switch the air conditioner directly to the air supply mode.
The method according to claim 7, further comprising: S4, the throttling device automatically adjusts the opening degree by judging the return air superheat of the compressor, so that the air conditioner is always in an optimal operating state;

When the throttling device is an electronic expansion valve, it includes:

S401. Measure the actual intake air temperature T s of the compressor, and make a difference between the actual intake air temperature T s of the compressor and the set suction air temperature T 0 of the compressor, and obtain the return air superheat degree of the compressor ΔT= T s -T 0 ;

S402. Determine the size of ΔT:

If ΔT<-1, reduce the opening of the electronic expansion valve;

If ΔT>1, increase the opening of the electronic expansion valve;

If -1 ≤ △T ≤ 1, the current electronic expansion valve opening is kept unchanged.
The method according to claim 7, wherein in S2, the first switching valve, the refrigerant reservoir and the one-way shut-off valve are sequentially connected in series on the bypass branch, and the first switching valve is located in the refrigerant reservoir close to the a side of the outdoor heat exchanger, the one-way shutoff valve is conductive along the outdoor heat exchanger in a direction to the throttling device;

When it is necessary to store the refrigerant through the bypass branch, the first on-off valve is opened such that the refrigerant flows into the refrigerant reservoir.
The method according to claim 7, wherein in S3, if the compressor is a two-cylinder variable capacity compressor, the method comprises:

S301. Switching the compressor from the two-cylinder operating state to the large-cylinder operating state, and determining the relationship between the P real and the P setting after the operation is stable:

If P real ≤P set, the air conditioner to maintain the current running state;

If the solid P> P set, the compressor will be switched from the operating state to a small vat cylinder operating state;

S302. In the small cylinder running state, determine the relationship between the P real and the P setting :

If P real ≤P set, the air conditioner to maintain the current running state;

If P is set to P, the air conditioner is switched to the air supply mode.