CN101504236A - Control method for four-way valve - Google Patents
Control method for four-way valve Download PDFInfo
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- CN101504236A CN101504236A CNA2009100968276A CN200910096827A CN101504236A CN 101504236 A CN101504236 A CN 101504236A CN A2009100968276 A CNA2009100968276 A CN A2009100968276A CN 200910096827 A CN200910096827 A CN 200910096827A CN 101504236 A CN101504236 A CN 101504236A
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Abstract
The invention discloses low-reversing reliability and frequency method for controlling a four-way valve, which comprises control processes under the following use conditions: during heat generation, time A is determined according to an ambient temperature and an unloading electromagnetic valve is turned off at the same time, then the cold air-resistance operation of an indoor fan and an inverter compressor are started, a pilot valve of a four-way wave is turned on to act when the inverter compressor operates for 180+A seconds, and the four-way valve realizes inversion and an outdoor fan operates at the same time; for machine stop during heat generation, the inverter compressor and the outdoor fan are turned off first, then the unloading electromagnetic valve is turned on to allow an exhaust pipe and an intake pipe to be communicated continuously for time B, and finally the pilot valve of the four-way valve is controlled to be turned off to reset and the indoor fan is turned off at the same time, wherein the time B is between 5 and 15 seconds; and during heat regeneration, the unloading electromagnetic valve is turned off first and the pilot valve of the four-way valve is controlled to be turned on to act at the same time, then the inverter compressor is started, and the indoor fan starts cold air-resistance operation and the outdoor fan starts operation when the inverter compressor operates for 180 seconds.
Description
Technical field
The present invention relates to air source heat pump convertible frequency air-conditioner technical field, specifically is a kind of control method of cross valve.
Background technology
At present, cross valve is one of key component of air source heat pump convertible frequency air-conditioner, this cross valve is generally by valve body, main slide valve, pilot valve and other related accessories are formed, concrete structure as shown in Figure 1, the commutation of the main slide valve of air source heat pump convertible frequency air-conditioner dependence cross valve realizes the switching between refrigeration mode and the heating mode, and the commutation of the main slide valve of the cross valve of prior art must be satisfied following primary condition, described pilot valve gets the action of electric back, the plunger shaft at described main slide valve two ends is communicated with the blast pipe and the air intake duct of air source heat pump convertible frequency air-conditioner respectively, make the plunger shaft at described main slide valve two ends set up pressure reduction, because described blast pipe is communicated with compressor, so the pressure of described blast pipe can be higher than air intake duct all the time, like this, described cross valve relies on the pressure reduction between described blast pipe and the air intake duct to promote main slide valve, make the main slide valve commutation, because the characteristics of described this body structure of cross valve, in the main slide valve course of action, there is the gas blowby state in described cross valve, be that described blast pipe is communicated with air intake duct is instantaneous, concrete structure as shown in Figure 2, this instantaneous connection can reduce the pressure reduction between described blast pipe and the air intake duct.Because the power source of air source heat pump convertible frequency air-conditioner is a frequency-changeable compressor, so when the air source heat pump convertible frequency air-conditioner starts, described frequency-changeable compressor moves 2 minutes to 3 minutes at least in low-frequency range (referring generally to the section that the frequency-changeable compressor running frequency is lower than 50HZ), the purpose of doing like this is frequency-changeable compressor is carried out effectively lubricating and prevents that it from losing oil fast, because the frequency-changeable compressor running frequency is low, this moment, the refrigerant circulation was just very little, like this, pressure reduction is little between described blast pipe and the air intake duct, again because air source heat pump frequency-conversion air-conditioning system complexity, particularly one drag many or multiple air conditioner air supply heat pump convertible frequency air-conditioner, the cross valve specification is bigger, described main slide valve bypass amount when the gas blowby state is big, at this moment, described gas blowby status pole the earth has reduced the pressure reduction between described blast pipe and the air intake duct, like this, the pressure reduction of the plunger shaft at the main slide valve two ends of being set up by pilot valve can't promote described main slide valve, described main slide valve has just blocked, that is to say, described air source heat pump convertible frequency air-conditioner can't be finished the switching between refrigeration mode and the heating mode, the air source heat pump convertible frequency air-conditioner that has this fault can not freeze and can not heat, particularly, when outdoor environment temperature lower (being lower than-8 ℃) such as the off-premises station temperature, described air source heat pump convertible frequency air-conditioner is in start-up course, and when refrigeration mode switches to heating mode, following situation can appear, after even frequency-changeable compressor changes the high frequency operation by low frequency, described refrigerant circulation is still very little, and the existence of gas blowby state diminishes the pressure reduction between described blast pipe and the air intake duct, like this, the pressure reduction of the plunger shaft at the main slide valve two ends of being set up by pilot valve still can't promote described main slide valve, causes the air source heat pump convertible frequency air-conditioner can't carry out heating operation.And in the higher environment of temperature, because frequency-changeable compressor can make more quickly and set up the influence that enough pressure reduction is offset the gas blowby state between described blast pipe and the air intake duct, so the main valve of cross valve is in commutation process, generally can not block, that is to say that the probability of cross valve generation commutation failure is low.
In the control method of existing cross valve, the main valve of cross valve is defaulted as the refrigeration location status, so when the air source heat pump convertible frequency air-conditioner was worked under refrigeration mode, its start-up course or stopping process can not cause the main valve commutation of cross valve; When the air source heat pump convertible frequency air-conditioner is worked under heating mode; its start-up course or stopping process all can cause the main valve commutation of cross valve; that is to say; mode of operation when used last time is refrigeration mode; when the air source heat pump convertible frequency air-conditioner reuses after shutting down after a while and is set at heating mode; in start-up course; the main valve commutation of cross valve is for heating location status; when the air source heat pump convertible frequency air-conditioner is shut down under heating mode; the main valve commutation of cross valve is the refrigeration location status; when the air source heat pump convertible frequency air-conditioner starts once more after following shutdown of heating mode last time and enters heating mode; in start-up course, the main valve of cross valve commutates to heating location status.
From above-mentioned analysis as can be known, under low temperature environment, when the air source heat pump convertible frequency air-conditioner is set at heating mode, the main valve of cross valve can't commutate owing to pressure reduction between described blast pipe and the air intake duct is not enough, easy fault, and the air source heat pump convertible frequency air-conditioner when using heating mode at every turn, the capital causes the main valve of cross valve to commutate twice, so, in whole cold season, the user uses heating mode, the main valve commutation number of times of cross valve will be very many, this has just improved the probability of cross valve generation commutation failure greatly, so the low and commutation of the commutation reliability of existing cross valve often.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes the shortcoming of above prior art, and a kind of control method that can greatly improve the commutation reliability of cross valve and significantly reduce the cross valve of cross valve commutation number of times under low temperature environment is provided.
Technical scheme of the present invention is, a kind of control method with cross valve of following control procedure is provided, and it comprises the control procedure under the following operating position,
Mode of operation when used last time is refrigeration mode, and when the air source heat pump convertible frequency air-conditioner reused after shutting down after a while and is set at heating mode, in start-up course, the central microprocessing unit of air source heat pump convertible frequency air-conditioner was carried out following operation,
Obtain outdoor environment temperature by the outdoor environment temperature sensor, and determine time A according to this temperature, promptly when outdoor environment temperature is lower than-7 ℃, A is 60 seconds, when outdoor environment temperature is higher than-7 ℃ and when being lower than 7 ℃, A is 30 seconds, when outdoor environment temperature is higher than 7 ℃ when being lower than 15 ℃, A is 10 seconds, and when outdoor environment temperature was higher than 15 ℃, A was 5 seconds;
When determining time A, close the unloading magnetic valve blast pipe of air source heat pump convertible frequency air-conditioner is not communicated with air intake duct, then start frequency-changeable compressor, the anti-cold wind operation of indoor fan;
As frequency-changeable compressor operation 180+A after second, the pilot valve of cross valve gets electronic work, and cross valve is realized commutation, outdoor fan operation simultaneously;
Start-up course when so far, described air source heat pump convertible frequency air-conditioner becomes heating mode by refrigeration mode is finished;
Stopping process under the heating mode, described central microprocessing unit is carried out following operation,
At first close frequency-changeable compressor and outdoor fan, opening the unloading magnetic valve then makes described blast pipe be communicated with air intake duct, the pilot valve dead electricity of controlling cross valve behind the connected state duration of described blast pipe and air intake duct B again resets, simultaneously close chamber's inner blower; The interval of time B is 5 to 15 seconds;
So far, the stopping process of described air source heat pump convertible frequency air-conditioner under heating mode finished;
Started once more after heating mode was shut down down from last time and the start-up course when entering heating mode, described central microprocessing unit is carried out following operation,
At first closing the unloading magnetic valve makes the blast pipe of air source heat pump convertible frequency air-conditioner not be communicated with air intake duct, the pilot valve of controlling cross valve simultaneously gets electronic work, starts frequency-changeable compressor then, after frequency-changeable compressor moves 180 seconds, the anti-cold wind operation of indoor fan, the outdoor fan operation;
So far, described air source heat pump convertible frequency air-conditioner starts after heating mode was shut down down from last time and the start-up course when entering heating mode is finished once more.
After adopting said method, the present invention compared with prior art has following remarkable advantage and beneficial effect:
Under low temperature environment, when the air source heat pump convertible frequency air-conditioner starts after original refrigeration mode is shut down a period of time when entering heating mode once more, mention in the technical scheme of the present invention, obtain outdoor environment temperature by the outdoor environment temperature sensor, and determine A according to this temperature, closing the unloading magnetic valve simultaneously makes the blast pipe of air source heat pump convertible frequency air-conditioner not be communicated with air intake duct, then start frequency-changeable compressor, the anti-cold wind operation of indoor fan, the purpose of doing like this is to avoid the gas blowby state of cross valve, make and little by little set up pressure reduction between described blast pipe and the air intake duct, when frequency-changeable compressor moves 120+A after second, pressure reduction between described blast pipe and the air intake duct is just set up and is enough big, the pilot valve of controlling cross valve again gets electronic work, follow the main slide valve of described cross valve and under the differential pressure action between blast pipe and the air intake duct, realize commutation, though in commutation process, still there is the gas blowby state of cross valve, but because the pressure reduction between described blast pipe and the air intake duct is enough big, so the pressure loss that described gas blowby state is produced is unlikely to significantly to influence the pressure reduction between blast pipe and the air intake duct, like this, under low temperature environment, the commutation reliability of cross valve is improved greatly;
Also mention the stopping process of air source heat pump convertible frequency air-conditioner under heating mode in the technical scheme of the present invention, the purpose of doing like this is to allow the main slide valve of cross valve rest on after air-conditioning is shut down and heats location status, and unlike prior art, make it reset to the refrigeration location status, because in low temperature environment, the user uses the purpose of air source heat pump convertible frequency air-conditioner to be heating, so the stopping process of air source heat pump convertible frequency air-conditioner under heating mode of mentioning in the technical scheme of the present invention is to start and enter heating mode for the air source heat pump convertible frequency air-conditioner is next to prepare, and so just significantly reduced the commutation number of times of cross valve;
Also mentioned in the technical scheme of the present invention from last time and to start once more after heating mode is shut down down and the start-up course when entering heating mode; the purpose of doing like this is to allow the main slide valve of cross valve remain on and heats location status; reduce the commutation number of times of cross valve; shorten the start-up time of air source heat pump convertible frequency air-conditioner, make the user obtain reasonable experience.
Figure of description
Fig. 1 is the structural representation of cross valve.
Fig. 2 is the location status schematic diagram of the main slide valve of cross valve when the gas blowby state.
Shown in the figure, 1, main slide valve, 2, pilot valve, 3, frequency-changeable compressor, 4, indoor units, 5, outdoor unit.
The specific embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
Figure 1 shows that the basic structure of the cross valve of prior art, generally form by valve body, main slide valve 1, pilot valve 2 and other related accessories, arrow is the flow direction of refrigerant among Fig. 1, the annexation of also having drawn cross valve and frequency-changeable compressor 3, indoor units 4, outdoor unit 5 among Fig. 1 is with the basic structure and the work characteristics of the cross valve of conveniently understanding prior art.
Fig. 2 is the location status schematic diagram of the main slide valve 1 of cross valve when the gas blowby state, arrow among Fig. 2 is the flow direction of refrigerant, therefrom we can see, when the gas blowby state, described blast pipe is communicated with air intake duct is instantaneous, causes the pressure reduction between blast pipe and the air intake duct to reduce thereby produce bypass flow.
The control method of cross valve of the present invention comprises the control procedure under the following operating position,
Mode of operation when used last time is refrigeration mode, and when the air source heat pump convertible frequency air-conditioner reused after shutting down after a while and is set at heating mode, in start-up course, the central microprocessing unit of air source heat pump convertible frequency air-conditioner was carried out following operation,
Obtain outdoor environment temperature by the outdoor environment temperature sensor, and determine time A according to this temperature, promptly when outdoor environment temperature is lower than-7 ℃, A is 60 seconds, when outdoor environment temperature is higher than-7 ℃ and when being lower than 7 ℃, A is 30 seconds, when outdoor environment temperature is higher than 7 ℃ when being lower than 15 ℃, A is 10 seconds, and when outdoor environment temperature was higher than 15 ℃, A was 5 seconds;
When determining time A, close the unloading magnetic valve blast pipe of air source heat pump convertible frequency air-conditioner is not communicated with air intake duct, then start frequency-changeable compressor 3, the anti-cold wind operation of indoor fan;
As frequency-changeable compressor 3 operation 180+A after second, the pilot valve 2 of cross valve electronic work, cross valve is realized commutation, outdoor fan operation simultaneously;
Start-up course when so far, described air source heat pump convertible frequency air-conditioner becomes heating mode by refrigeration mode is finished;
Stopping process under the heating mode, described central microprocessing unit is carried out following operation,
At first close frequency-changeable compressor 3 and outdoor fan, opening the unloading magnetic valve then makes described blast pipe be communicated with air intake duct, pilot valve 2 dead electricity of controlling cross valve behind the connected state duration of described blast pipe and air intake duct B again reset, simultaneously close chamber's inner blower; The interval of time B is 5 to 15 seconds;
So far, the stopping process of described air source heat pump convertible frequency air-conditioner under heating mode finished;
Started once more after heating mode was shut down down from last time and the start-up course when entering heating mode, described central microprocessing unit is carried out following operation,
At first closing the unloading magnetic valve makes the blast pipe of air source heat pump convertible frequency air-conditioner not be communicated with air intake duct, the pilot valve 2 of controlling cross valve simultaneously gets electronic work, starts frequency-changeable compressor 3 then, after frequency-changeable compressor 3 moves 180 seconds, the anti-cold wind operation of indoor fan, the outdoor fan operation;
So far, described air source heat pump convertible frequency air-conditioner starts after heating mode was shut down down from last time and the start-up course when entering heating mode is finished once more.
Described time B is taken as 10 seconds.
The air source heat pump convertible frequency air-conditioner starts the start-up course when entering refrigeration mode once more after original heating mode is shut down a period of time; as setting forth in the background technology; because when the user is freezed; generally be that environment temperature is higher the time; frequency-changeable compressor can make more quickly and set up the influence that enough pressure reduction is offset the gas blowby state between described blast pipe and the air intake duct; the main slide valve 1 of cross valve is in commutation process; generally can not block; that is to say; the probability of cross valve generation commutation failure is low; so the control method of the cross valve when pressing the refrigeration mode of prior art this moment gets final product.
The stopping process of air source heat pump convertible frequency air-conditioner when refrigeration mode gets final product by the control method of the cross valve of prior art.
Claims (2)
1, a kind of control method of cross valve is characterized in that: comprise the control procedure under the following operating position,
Mode of operation when used last time is refrigeration mode, and when the air source heat pump convertible frequency air-conditioner reused after shutting down after a while and is set at heating mode, in start-up course, the central microprocessing unit of air source heat pump convertible frequency air-conditioner was carried out following operation,
Obtain outdoor environment temperature by the outdoor environment temperature sensor, and determine time A according to this temperature, promptly when outdoor environment temperature is lower than-7 ℃, A is 60 seconds, when outdoor environment temperature is higher than-7 ℃ and when being lower than 7 ℃, A is 30 seconds, when outdoor environment temperature is higher than 7 ℃ when being lower than 15 ℃, A is 10 seconds, and when outdoor environment temperature was higher than 15 ℃, A was 5 seconds;
When determining time A, close the unloading magnetic valve blast pipe of air source heat pump convertible frequency air-conditioner is not communicated with air intake duct, then start frequency-changeable compressor (3), the anti-cold wind operation of indoor fan;
As frequency-changeable compressor (3) operation 180+A after second, the pilot valve of cross valve (2) electronic work, cross valve is realized commutation, outdoor fan operation simultaneously;
Start-up course when so far, described air source heat pump convertible frequency air-conditioner becomes heating mode by refrigeration mode is finished;
Stopping process under the heating mode, described central microprocessing unit is carried out following operation,
At first close frequency-changeable compressor (3) and outdoor fan, opening the unloading magnetic valve then makes described blast pipe be communicated with air intake duct, pilot valve (2) dead electricity of controlling cross valve behind the connected state duration of described blast pipe and air intake duct B again resets, simultaneously close chamber's inner blower; The interval of time B is 5 to 15 seconds;
So far, the stopping process of described air source heat pump convertible frequency air-conditioner under heating mode finished;
Started once more after heating mode was shut down down from last time and the start-up course when entering heating mode, described central microprocessing unit is carried out following operation,
At first closing the unloading magnetic valve makes the blast pipe of air source heat pump convertible frequency air-conditioner not be communicated with air intake duct, the pilot valve (2) of controlling cross valve simultaneously gets electronic work, start frequency-changeable compressor (3) then, after frequency-changeable compressor (3) moves 180 seconds, the anti-cold wind operation of indoor fan, the outdoor fan operation;
So far, described air source heat pump convertible frequency air-conditioner starts after heating mode was shut down down from last time and the start-up course when entering heating mode is finished once more.
2, the control method of cross valve according to claim 1 is characterized in that: described time B is taken as 10 seconds.
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| CN114608156A (en) * | 2020-12-08 | 2022-06-10 | 广东美的制冷设备有限公司 | Air conditioner, control method and device thereof, and computer-readable storage medium |
| CN112781274A (en) * | 2020-12-25 | 2021-05-11 | 珠海格力电器股份有限公司 | Heat pump unit control method |
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| CN114151944A (en) * | 2021-12-06 | 2022-03-08 | 珠海格力电器股份有限公司 | Control method and device of air conditioner, storage medium and air conditioner |
| CN114151944B (en) * | 2021-12-06 | 2022-11-15 | 珠海格力电器股份有限公司 | Control method and device of air conditioner, storage medium and air conditioner |
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