CN104061659A - Air conditioning system and coolant recycling method thereof - Google Patents
Air conditioning system and coolant recycling method thereof Download PDFInfo
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- CN104061659A CN104061659A CN201410327552.3A CN201410327552A CN104061659A CN 104061659 A CN104061659 A CN 104061659A CN 201410327552 A CN201410327552 A CN 201410327552A CN 104061659 A CN104061659 A CN 104061659A
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Abstract
The invention discloses an air conditioning system coolant recycling method. A compressor air exhausting opening of an air conditioning system is in serial connection with a one-way valve. When coolants leak or an air conditioner needs to be maintained, the air conditioning system coolant recycling method comprises the steps of sealing a coolant outlet pipeline of a condenser, detecting return air pressure of a compressor inlet in the air conditioning system, controlling a compressor to be stopped when the return air pressure reaches first preset cut-out pressure and sealing a coolant inlet pipeline of the condenser. The recycling method can recycle coolants of the system in time when the coolants leak or the air conditioner needs to be maintained and prevents the coolants from being discharged into external environment. Thus, the natural environment can be effectively protected, meanwhile health hazards of the coolants to maintaining workers are effectively eliminated, and economical loss caused by coolant waste is avoided. The invention further discloses an air conditioning system where the recycling method is applied.
Description
Technical field
The present invention relates to air-conditioning manufacturing technology field, relate in particular to the recovery method of a kind of air-conditioning system and refrigerant thereof.
Background technology
In air-conditioning system, generally comprise the critical pieces such as compressor, condenser, throttling arrangement and evaporimeter, these critical pieces are connected and are formed air-conditioning system by refrigerant pipeline, in the process of air-conditioning transport or operation of air conditioner, if leaking appears in the refrigerant pipeline connecting between each critical piece, will cause whole air-conditioning system to work on.
In current air-conditioning system, occur leaking once refrigerant pipeline and need repairing, cannot effectively reclaim refrigerant, conventionally can only be by intrasystem coolant discharging in external environment, this has not only caused the serious waste of refrigerant, also can cause destruction to a certain extent to the ozone layer in atmosphere, and simultaneously in the time that maintenance personal carries out the maintenance of air-conditioning system, be discharged into refrigerant in external environment and also can cause certain harm to maintenance personal healthy.Air-conditioning after maintenance needs again in system, to fill refrigerant, and this has also caused certain economic loss for user itself.
Therefore, how can occur to reveal or can reclaim in time intrasystem refrigerant when air-conditioning need to keep in repair in system, be the technical problem that current those skilled in the art need solution badly to avoid refrigerant to be discharged in external environment.
Summary of the invention
One of object of the present invention is to provide a kind of recovery method of air-conditioning system refrigerant, to reclaim in time at the refrigerant that system occurs to leak or air-conditioning retains in can be to system need to keep in repair time, thereby avoids refrigerant pollution environment, and reduces economic loss.
Another object of the present invention is also to provide a kind of air-conditioning system of applying said method and carrying out refrigerant recovering.
For achieving the above object, following method provided by the present invention:
A recovery method for air-conditioning system refrigerant, the exhaust outlet of compressor in described air-conditioning system is in series with check valve, in the time of coolant leakage or air-conditioning maintenance, comprises step:
1) the refrigerant exit pipeline of sealing condenser;
2) back pressure of suction port of compressor in detection air-conditioning system, in the time that described back pressure reaches the first default opening pressure, controls compressor out of service;
3) seal the refrigerant entrance pipe of described condenser.
Preferably, in the time of normal shutdown, comprise step:
11) seal the refrigerant exit pipeline of described condenser;
12) back pressure of suction port of compressor in detection air-conditioning system, in the time that described back pressure reaches the second default opening pressure, the compressor in control air-conditioning system is out of service.
Preferably, in above-mentioned recovery method, the described first default opening pressure is less than the described second default opening pressure.
Preferably, in above-mentioned recovery method, the described first default opening pressure is P
1, and 0.1MPa≤P
1< 0.2MPa, the described second default opening pressure is P
2, and 0.2MPa≤P
2< 0.4MPa.
A kind of air-conditioning system is also provided in the present invention, has comprised compressor, condenser, choke valve and the evaporimeter of connecting successively and form loop, and the exhaust outlet of described compressor is also serially connected with check valve, this air-conditioning system also comprises:
Be arranged between described condenser and described choke valve, and can seal the first stop valve of the refrigerant exit pipeline of described condenser;
Be arranged at the first pressure switch in the return line between described evaporimeter and described compressor, in the time that back pressure reaches the first default opening pressure, described the first pressure switch is moved and is made described compressor power-off;
Be arranged between described check valve and described condenser, and can seal the second stop valve of described condenser refrigerant entrance pipe.
Preferably, in above-mentioned air-conditioning system, also comprise:
Be arranged between described condenser and described choke valve, and can seal the magnetic valve of the refrigerant exit pipeline of described condenser, described magnetic valve and air-conditioning closing key circuit communication, and in the time that air-conditioning closing key is pressed, described magnetic valve power-off is closed;
Be arranged at the second pressure switch in the return line between described evaporimeter and described compressor, described the second pressure switch and described air-conditioning closing key circuit communication, and in the time that air-conditioning closing key is pressed, described the second pressure switch is in running order, in the time that described back pressure reaches the second default opening pressure, described the second pressure switch is moved and is made described compressor power-off, and the described second default opening pressure is greater than the described first default opening pressure.
Preferably, in above-mentioned air-conditioning system, the described first default opening pressure is P
1, and 0.1MPa≤P
1< 0.2MPa, the described second default opening pressure is P
2, and 0.2MPa≤P
2< 0.4MPa.
Preferably, in above-mentioned air-conditioning system, also comprise the 3rd pressure switch in the return line being arranged between described evaporimeter and described compressor, and in the time that air-conditioning is in running order, when described back pressure is less than or equal to the default cut-in pressure of described the 3rd pressure switch, described the 3rd pressure switch is moved and is made described magnetic valve energising conducting; In the time that described back pressure reaches the default opening pressure of described the 3rd pressure switch, described the 3rd pressure switch is moved and described magnetic valve power-off is closed, wherein said default opening pressure is greater than described default cut-in pressure, and described default cut-in pressure is greater than the described second default opening pressure.
Preferably, in above-mentioned air-conditioning system, also comprise on the gas exhaust piping being arranged between described check valve and described the second stop valve, and for the 4th pressure switch of air-conditioning system high voltage protective, and in the time that described pressure at expulsion arrives upper limit cut off value, described the 4th pressure switch is moved and is made described compressor power-off; In the time that described pressure at expulsion is reduced to connection value, described the 4th pressure switch action makes described compressor energising.
Preferably, in above-mentioned air-conditioning system, described condenser is water cooling type condenser.
By finding out in above technical scheme, in the recovery method of the air-conditioning system refrigerant providing in the present invention, in the time that secondary refrigerant leakage or air-conditioning need repairing, first close the refrigerant exit pipeline of condenser, now because compressor of air conditioner is still in operation, thereby retain in air-conditioning system choke valve, evaporimeter and the refrigerant connecting in the pipeline of these parts are sucked continuation by compressor, and be discharged in condenser by the exhaust outlet of compressor, after the refrigerant exit pipeline of condenser is closed, detect the back pressure of suction port of compressor in air-conditioning system, and in the time that back pressure reaches the first default opening pressure value, think that the residual refrigerant of suction side is reclaimed completely, now control compressor out of service, then close the refrigerant entrance pipe of condenser.
After the entrance pipe of condenser is closed; refrigerant will be recycled in condenser and be deposited completely; this just realized system occur to leak or air-conditioning need to keep in repair time to system in the timely recovery of refrigerant; avoid refrigerant to the discharge in external environment; this is effective conservation of nature environment not only; also effectively eliminate the health hazard of refrigerant to maintenance personal simultaneously, and avoided refrigerant to waste the economic loss of bringing.
In the air-conditioning system providing in the present invention, owing to being provided with the first stop valve of the refrigerant exit pipeline that can seal condenser, with second stop valve of refrigerant entrance pipe that can seal condenser, and in the return line of compressor, be also provided with the first pressure switch, in the time that back pressure reaches the first default opening pressure, the first pressure switch is moved and is made compressor power-off, therefore, when this air-conditioning system occurs secondary refrigerant leakage or need to keep in repair, can utilize above-mentioned recovery method to carry out the recovery of refrigerant.
Brief description of the drawings
When secondary refrigerant leakage or the air-conditioning maintenance schematic flow sheet of refrigerant recovering method of Fig. 1 for providing in the embodiment of the present invention;
When the air-conditioning normal shutdown schematic flow sheet of refrigerant recovering method of Fig. 2 for providing in the embodiment of the present invention;
The structural representation that Fig. 3 is the air-conditioning system that provides in the embodiment of the present invention.
Wherein, 1 is compressor, and 2 is condenser, 3 is choke valve, and 4 is evaporimeter, and 5 is check valve, 6 is the first stop valve, 7 is the first pressure switch, and 8 is the second stop valve, and 9 is magnetic valve, 10 is the second pressure switch, 11 is the 3rd pressure switch, and 12 is the 4th pressure switch, and 13 is blower fan.
Detailed description of the invention
One of core object of the present invention is to provide a kind of recovery method of air-conditioning system refrigerant, to reclaim in time at the refrigerant that system occurs to leak or air-conditioning retains in can be to system need to keep in repair time, thereby avoid refrigerant pollution environment, and reduce economic loss.
Another core object of the present invention is to provide a kind of air-conditioning system of applying said method and carrying out refrigerant recovering.
In order to make those skilled in the art person understand better the solution of the present invention, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 1, in the present invention, disclosed recovery method is applicable to the recovery of refrigerant in air-conditioning system that compressor 1 exhaust outlet is in series with check valve 5, wherein, the check valve 5 that compressor 1 exhaust outlet is connected is back to compressor 1 inside for preventing refrigerant, this recovery method, the in the situation that of secondary refrigerant leakage or air-conditioning maintenance, comprises the following steps:
S1) the refrigerant exit pipeline of sealing condenser 2;
The outlet of the condenser 2 in air-conditioning system is connected with choke valve 3 by refrigerant exit pipeline, the entrance of condenser 2 is connected with the exhaust outlet of compressor 1 by refrigerant entrance pipe, in the time that refrigerant need to be recycled in condenser 2, first seal the refrigerant exit pipeline of condenser 2, the refrigerant that at this moment enters into condenser 2 inside will can not continue to flow to choke valve 3.
S2) detect the back pressure of compressor 1 entrance in air-conditioning system, and in the time that back pressure reaches the first default opening pressure, control compressor 1 out of service;
In the time that the refrigerant exit pipeline of condenser 2 is closed, whole air-conditioning system will be truncated, because compressor 1 is now still in running status, therefore choke valve 3, evaporimeter 4 and the refrigerant connecting in the pipeline of these parts still can be sucked by compressor 1, and discharge from exhaust outlet complete compression in compressor 1 after, the large I of back pressure reflects the number of the residual refrigerant of compressor 1 entrance side, thereby the back pressure of compressor 1 entrance is detected, and in the time that back pressure reaches the first default opening pressure, think the refrigerant noresidue of compressor 1 entrance side, now control compressor 1 out of service.
S3) the refrigerant entrance pipe of sealing condenser 2.
After compressor is out of service, intrasystem refrigerant will be all discharged in condenser 2 by compressor 1, after now closing the refrigerant entrance pipe of condenser 2, refrigerant can be dammed in condenser 2, thereby complete the refrigerant recovering in the time of secondary refrigerant leakage or air-conditioning maintenance.
By finding out in above embodiment; the recovery method of the air-conditioning system refrigerant providing in the embodiment of the present invention realized system occur to leak or air-conditioning need to keep in repair time to system in the timely recovery of refrigerant; avoid refrigerant to the discharge in external environment; this is effective conservation of nature environment not only; also effectively eliminate the health hazard of refrigerant to maintenance personal simultaneously, and avoided refrigerant to waste the economic loss of bringing.
Under the state of air-conditioning shutdown, by in the condenser that refrigerant recovering is higher to security and capacity is larger 2, pipe-line system in refrigeration air-conditioner is had to good protective effect, for this reason in the embodiment of the present invention in the recovery method of disclosed air-conditioning system refrigerant, refrigerant recovering method while being also included in normal shutdown, as shown in Figure 2, under normal circumstances, when shutdown, need to first carry out power-off operation, as step S0) press closing key;
When shutdown, the recovery method of this refrigerant comprises step:
S11) the refrigerant exit pipeline of sealing condenser 2;
The outlet of the condenser 2 in air-conditioning system is connected with choke valve 3 by refrigerant exit pipeline, the entrance of condenser 2 is connected with the exhaust outlet of compressor 1 by refrigerant entrance pipe, in the time that refrigerant need to be recycled in condenser 2, first seal the refrigerant exit pipeline of condenser 2, the refrigerant that at this moment enters into condenser 2 inside will can not continue to flow to choke valve 3.
S12) back pressure of compressor 1 entrance in detection air-conditioning system, in the time that back pressure reaches the second default opening pressure, the compressor 1 in control air-conditioning system is out of service.
In the time that the refrigerant exit pipeline of condenser 2 is closed, whole air-conditioning system will be truncated, because compressor 1 is now still in running status, therefore choke valve 3, evaporimeter 4 and the refrigerant connecting in the pipeline of these parts still can be sucked by compressor 1, and discharge from exhaust outlet complete compression in compressor 1 after, the large I of back pressure reflects the number of the residual refrigerant of compressor 1 entrance side, thereby the back pressure of compressor 1 entrance is detected, and in the time that back pressure reaches the second default opening pressure, think compressor 1 entrance side refrigerant major part be recovered, now control compressor 1 out of service, because the air exit side of compressor 1 is in series with check valve 5, thereby most refrigerant will be dammed between check valve 5 and the refrigerant exit pipeline of condenser 2.
Because the object under normal shutdown state, refrigerant being reclaimed is the refrigerant line in order to protect air-conditioning system, in the time again starting shooting, need to ensure that refrigerant can circulate fast in air-conditioning system, thereby in the time of normal shutdown, only need the refrigerant in system to carry out partially recycled, therefore the default opening pressure of second in above-described embodiment is preferably greater than the first default opening pressure, while carrying out refrigerant recovering under air-conditioning normal shutdown state, refrigerant amount retained when the refrigerant amount retained of compressor 1 entrance side can be greater than secondary refrigerant leakage or air-conditioning and needs repairing, during so that again start shooting, air-conditioning can enter duty fast.
The first default opening pressure is P
1, the second default opening pressure is P
2, P under normal circumstances
1be more than or equal to 0.1MPa and be less than 0.2MPa, P
2be more than or equal to 0.2MPa and be less than 0.4MPa.
A kind of air-conditioning system of utilizing above-mentioned recovery method to carry out refrigerant recovering is also disclosed in the embodiment of the present invention, as shown in Figure 3, this air-conditioning system comprises compressor 1, condenser 2, choke valve 3 and the evaporimeter 4 of connecting successively and form loop, and on the exhaust outlet of compressor 1, be also serially connected with check valve 5, in this air-conditioning system, also comprise:
The first stop valve 6, the first stop valves 6 are arranged between condenser 2 and choke valve 3, and the first stop valve 6 can seal the refrigerant exit pipeline of condenser 2;
The first pressure switch 7, the first pressure switch 7 is arranged in the return line between evaporimeter 4 and compressor 1, in the time that back pressure reaches the first default opening pressure, the first pressure switch 7 is moved, and makes compressor 1 power-off (out of service) of connecting with the first pressure switch 7;
The second stop valve 8, the second stop valves 8 are arranged between check valve 5 and condenser 2, and the second stop valve 8 can seal the refrigerant entrance pipe of condenser.
The first stop valve 6 and the second stop valve 8 can be manual rotation control, and the stop valve of manual rotation control is comparatively common in large-scale central air-conditioning, and the stop valve that utilizes switch control can certainly be set in minitype air conditioner.
What need to describe is, in the embodiment of the present invention, so-called " can seal " specifically refers to that the parts such as the first stop valve, the second stop valve and magnetic valve have this kind of function, not refer to that above-mentioned parts are all the time in closed state, above-mentioned each parts also have opening state.
In the time that the refrigerant in air-conditioning occurs that leakage or air-conditioning need to keep in repair, first the first stop valve 6 is closed, thereby by the refrigerant exit pipeline sealing of condenser 2, in the time that the refrigerant exit pipeline of condenser 2 is closed, whole air-conditioning system will be truncated, because compressor 1 is now still in running status, therefore choke valve 3, evaporimeter 4 and the refrigerant connecting in the pipeline of these parts still can be sucked by compressor 1, and discharge from exhaust outlet complete compression in compressor 1 after, the large I of back pressure reflects the number of the residual refrigerant of compressor 1 entrance side, in the time that back pressure reaches the first default opening pressure, the first pressure switch 7 will be moved, and make the compressor 1 of connecting with the first pressure switch 7 out of service.
After compressor 1 is out of service, intrasystem refrigerant will be all discharged in condenser 2 by compressor 1, now close the second stop valve 8, thereby by the refrigerant entrance pipe sealing of condenser 2, to refrigerant is dammed in condenser 2, thereby complete the refrigerant recovering in the time of secondary refrigerant leakage or air-conditioning maintenance.
In order further to optimize the technical scheme in above-described embodiment, the air-conditioning system providing in the present embodiment is technical above-described embodiment, also comprises:
Be arranged between condenser 2 and choke valve 3 and can seal the magnetic valve 9 of the refrigerant exit pipeline of condenser 2, magnetic valve 9 and air-conditioning closing key circuit communication, and in the time that air-conditioning closing key is pressed, this magnetic valve 9 cuts out power-off;
Be arranged on the second pressure switch 10 in the return line between evaporimeter 4 and compressor 1, the second pressure switch and air-conditioning closing key circuit communication, and in the time that air-conditioning closing key is pressed, magnetic valve 9 is in closed condition, now the second pressure switch is access in system in running order, in the time that back pressure reaches the second default opening pressure, the second pressure switch 10 is moved and is made compressor 1 power-off, and the second default opening pressure should be greater than the first default opening pressure.
What need to describe is, so-called air-conditioning closing key is pressed and not refers to that closing key is always in down state, and should be understood to power-off operation widely, and it is emphasized that, the second pressure switch 10 links with closing key, and after closing key is pressed, the second pressure switch 10 is just linked in system, this kind of design is mainly used in avoiding in the situation that refrigerant occurs that leakage or air-conditioning need repairing, and the situation of compressor 1 power-off in advance appears in the second pressure switch 10.
Under normal circumstances, for being recovered completely of ensureing that refrigerant tries one's best, the first default opening pressure is being more than or equal to 0.1MPa, and the interior value of the scope that is less than 0.2MPa, the cut-in pressure of the first pressure switch 7 is being more than or equal to 0.2MPa and being less than value in the scope of 0.25MPa, for air-conditioning after ensureing again to start shooting can enter duty fast, the second default opening pressure is being more than or equal to 0.25MPa, and be less than value in the scope of 0.4MPa, the cut-in pressure of the second pressure switch 10 is being more than or equal to 0.4MPa and being less than value in the scope of 0.45MPa.
What need to describe is, only use for referencial use of the listed numerical value of enumerating in the present embodiment, according to the difference of refrigerant, the first default opening pressure, the second default opening pressure, the cut-in pressure of the first pressure switch 7 and the cut-in pressure of the second pressure switch 10 are all likely different, but need to ensure that the opening pressure of the first pressure switch 7 and the second pressure switch 10 is all less than the cut-in pressure of self, and the second default opening pressure is greater than the first default opening pressure.
Please refer to Fig. 3, in the time that air-conditioning is in running order, in order to regulate the aperture of choke valve in air-conditioning 3, in the present embodiment, on the basis of above-described embodiment, also comprise the 3rd pressure switch 11 in the return line being arranged between evaporimeter 4 and compressor 1, and at air-conditioning during in running status, in the time that back pressure is less than or equal to the default cut-in pressure of the 3rd pressure switch 11, the 3rd pressure switch 11 is moved, and make and the conducting of switching on of the 3rd pressure switch 11 series electrical magnet valves 9, so that increase the aperture of choke valve 3, in the time that back pressure reaches the default opening pressure of the 3rd pressure switch 11, the 3rd pressure switch 11 is moved and magnetic valve 9 power-off is closed, so that reduce the aperture of choke valve 3, wherein the default opening pressure of the 3rd pressure switch is greater than default cut-in pressure, and for fear of the first interference of pressure switch 7 to this process, the cut-in pressure of the 3rd pressure switch 11 providing in the present embodiment is greater than the first default opening pressure, more preferred, the cut-in pressure of the 3rd pressure switch 11 is greater than the second default opening pressure.
Preferably, the default opening pressure of the 3rd pressure switch 11 is 0.61MPa-1.1MPa, default cut-in pressure is 0.4-0.6MPa, the only use for referencial use of numerical value of certainly enumerating in the present embodiment, according to the difference of refrigerant, the default opening pressure of the 3rd pressure switch 11 also may be different with default cut-in pressure, but need the default opening pressure that ensures the 3rd pressure switch 11 to be greater than its default cut-in pressure, and default cut-in pressure is greater than the first default opening pressure.
While operation owing to just having started shooting at air-conditioning, a large amount of refrigerant in condenser 2 will be by choke valve 3, now the aperture of choke valve 3 does not also reach balance, refrigerant in evaporimeter 4 can not evaporate completely, partially liq refrigerant flows to compressor 1, back pressure increases, in the time that pressure reaches the default opening pressure of the 3rd pressure switch 11, the 3rd pressure switch 11 will be moved, and magnetic valve 9 cuts out, to reduce the flow that flows into the refrigerant in evaporimeter 4, prevent that liquid coolant from entering into the interior liquid hammer that occurs of compressor 1, after magnetic valve 9 power-off are closed, because air-conditioning system refrigerant circulation is cut off, now compressor 1 is still in running status, therefore choke valve 3, evaporimeter 4 and the refrigerant connecting in the pipeline of these parts still can be sucked by compressor 1, refrigerant in return line constantly reduces, back pressure reduces gradually, and in the time of the default cut-in pressure of pressure decreased to the three pressure switches 11 of the return line between evaporimeter 4 and compressor 1, the 3rd pressure switch 11 will be moved again, to make magnetic valve 9 conducting of switching on, thereby constantly open and close by magnetic valve 9, make the aperture of choke valve 3 reach balance, to ensure the safe operation of compressor 1.
In order further to ensure the safe operation of whole air-conditioning system; on the basis of above-described embodiment; in the present embodiment, also comprise on the gas exhaust piping being arranged between check valve 5 and the second stop valve 8; and for the 4th pressure switch 12 of air-conditioning system high voltage protective; as shown in Figure 3; in the time that the pressure at expulsion of compressor 1 reaches the upper limit cut off value of the 4th pressure switch 12; the 4th pressure switch 12 is moved and is made compressor 1 power-off of series connection with it; in the time that pressure at expulsion is reduced to the connection value of the 4th pressure switch 12, the 4th pressure switch 12 actions are switched on compressor 1.
This kind of design is mainly in order to protect the refrigeration pipe in air-conditioning system; avoid the cooling deficiency of condenser 2 because of air-conditioning; or severe running environment and cause the hypertonia in refrigeration pipe situation occur; more preferred; if the pressure at expulsion of the compressor 1 that air-conditioner controller receives reaches the upper limit cut off value of the 4th pressure switch 12 repeatedly; and controlled compressor 1 and repeatedly carried out after three break-makes, air-conditioning will start no longer automatically, need to fix a breakdown and manually boot air-conditioning equipment.
The air-conditioning system of mentioning in above-described embodiment is especially for large-scale central air conditioner system, and the preferably condenser of water-cooling type of condenser 2 in air-conditioning system.
Applied specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (10)
1. a recovery method for air-conditioning system refrigerant, the exhaust outlet of compressor in described air-conditioning system is in series with check valve, it is characterized in that, in the time of coolant leakage or air-conditioning maintenance, comprises step:
1) the refrigerant exit pipeline of sealing condenser;
2) back pressure of suction port of compressor in detection air-conditioning system, in the time that described back pressure reaches the first default opening pressure, controls compressor out of service;
3) seal the refrigerant entrance pipe of described condenser.
2. the recovery method of air-conditioning system refrigerant according to claim 1, is characterized in that, in the time of normal shutdown, comprises step:
11) seal the refrigerant exit pipeline of described condenser;
12) back pressure of suction port of compressor in detection air-conditioning system, in the time that described back pressure reaches the second default opening pressure, the compressor in control air-conditioning system is out of service.
3. the recovery method of air-conditioning system refrigerant according to claim 2, is characterized in that, the described first default opening pressure is less than the described second default opening pressure.
4. the recovery method of air-conditioning system refrigerant according to claim 3, is characterized in that, the described first default opening pressure is P
1, and 0.1MPa≤P
1< 0.2MPa, the described second default opening pressure is P
2, and 0.2MPa≤P
2< 0.4MPa.
5. an air-conditioning system, comprise compressor (1), condenser (2), choke valve (3) and the evaporimeter (4) of connecting successively and form loop, and the exhaust outlet of described compressor (1) is also serially connected with check valve (5), it is characterized in that, also comprise:
Be arranged between described condenser (2) and described choke valve (3), and can seal first stop valve (6) of the refrigerant exit pipeline of described condenser (2);
Be arranged at the first pressure switch (7) in the return line between described evaporimeter (4) and described compressor (1), in the time that back pressure reaches the first default opening pressure, described the first pressure switch (7) is moved and is made described compressor (1) power-off;
Be arranged between described check valve (5) and described condenser (2), and can seal second stop valve (8) of described condenser (2) refrigerant entrance pipe.
6. air-conditioning system according to claim 5, is characterized in that, also comprises:
Be arranged between described condenser (2) and described choke valve (3), and can seal the magnetic valve (9) of the refrigerant exit pipeline of described condenser (2), described magnetic valve (9) and air-conditioning closing key circuit communication, and in the time that air-conditioning closing key is pressed, described magnetic valve (9) power-off is closed;
Be arranged at the second pressure switch (10) in the return line between described evaporimeter (4) and described compressor (1), described the second pressure switch (10) and described air-conditioning closing key circuit communication, and in the time that air-conditioning closing key is pressed, described the second pressure switch (10) is in running order, in the time that described back pressure reaches the second default opening pressure, described the second pressure switch (10) is moved and is made described compressor (1) power-off, and the described second default opening pressure is greater than the described first default opening pressure.
7. air-conditioning system according to claim 6, is characterized in that, the described first default opening pressure is P
1, and 0.1MPa≤P
1< 0.2MPa, the described second default opening pressure is P
2, and 0.2MPa≤P
2< 0.4MPa.
8. air-conditioning system according to claim 6, it is characterized in that, also comprise the 3rd pressure switch (11) in the return line being arranged between described evaporimeter (4) and described compressor (1), and in the time that air-conditioning is in running order, when described back pressure is less than or equal to the default cut-in pressure of described the 3rd pressure switch (11), described the 3rd pressure switch (11) is moved and is made described magnetic valve (9) energising conducting; In the time that described back pressure reaches the default opening pressure of described the 3rd pressure switch (11), described the 3rd pressure switch (11) is moved and described magnetic valve (9) power-off is closed, wherein said default opening pressure is greater than described default cut-in pressure, and described default cut-in pressure is greater than the described second default opening pressure.
9. air-conditioning system according to claim 6, it is characterized in that, also comprise on the gas exhaust piping being arranged between described check valve (5) and described the second stop valve (8), and for the 4th pressure switch (12) of air-conditioning system high voltage protective, and in the time that described pressure at expulsion arrives upper limit cut off value, described the 4th pressure switch (12) is moved and is made described compressor (1) power-off; In the time that described pressure at expulsion is reduced to connection value, described the 4th pressure switch (12) action makes described compressor (1) energising.
10. according to the air-conditioning system described in claim 5-9 any one, it is characterized in that, described condenser (2) is water cooling type condenser.
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| CN105626499A (en) * | 2016-03-14 | 2016-06-01 | 广东美的制冷设备有限公司 | Low-pressure protecting method and device for air conditioner compressor |
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