CN114370386B - Refrigerator vacuumizing control method and refrigerator - Google Patents
Refrigerator vacuumizing control method and refrigerator Download PDFInfo
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- CN114370386B CN114370386B CN202011101163.0A CN202011101163A CN114370386B CN 114370386 B CN114370386 B CN 114370386B CN 202011101163 A CN202011101163 A CN 202011101163A CN 114370386 B CN114370386 B CN 114370386B
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- 238000000034 method Methods 0.000 title claims abstract description 74
- 230000008569 process Effects 0.000 claims abstract description 33
- 238000005086 pumping Methods 0.000 claims description 27
- 238000001514 detection method Methods 0.000 claims description 18
- 238000012544 monitoring process Methods 0.000 abstract description 8
- 239000013589 supplement Substances 0.000 abstract description 3
- 230000001502 supplementing effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000009825 accumulation Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000000605 extraction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
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- 238000004891 communication Methods 0.000 description 1
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- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/14—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/003—Arrangement or mounting of control or safety devices for movable devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
Abstract
The invention provides a refrigerator vacuumizing control method, which comprises a refrigerator body, a low-pressure storage unit and a vacuum pump, wherein the refrigerator body is used for defining a low-temperature storage room; the vacuumizing control method comprises the following steps: when the storage pressure P c in the low-pressure storage unit is higher than the set pressure threshold value P, the vacuum pump works and starts to vacuumize; in the vacuumizing process, when the vacuumizing pressure P reaches a pressure threshold value P, the vacuum pump continues to work to supplement vacuumizing, and vacuumizing is stopped when the supplementing vacuumizing time period T reaches a set time threshold value T; in this embodiment, after the vacuumizing pressure P is reduced to the pressure threshold P, controlling the vacuumizing process by time to react the vacuumizing vacuum degree by pressure in a higher pressure range, and reacting the vacuumizing vacuum degree by time in a lower pressure range and ending vacuumizing; the above arrangement enables more sensitive monitoring and control of the evacuation process.
Description
Technical Field
The invention belongs to the technical field of household refrigerators, and particularly relates to a refrigerator vacuumizing control method and a refrigerator.
Background
Refrigerators are an important share of the market as indispensable electrical products in home life. With the improvement of consumer demand for fresh food quality, new demands are also put on refrigerator configuration to hope that fresh food stored in the refrigerator can have longer storage period, thereby ensuring the freshness of food materials and preventing loss of nutrient components.
In view of this, the present invention has been proposed.
Disclosure of Invention
The invention provides a refrigerator vacuumizing control method aiming at the technical problems.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The refrigerator comprises a refrigerator body, a low-pressure storage unit and a vacuum pump, wherein the refrigerator body is used for limiting a heat-insulating low-temperature storage room, and the vacuum pump is communicated with the low-pressure storage unit so as to pump out air in the low-pressure storage unit; the vacuumizing control method comprises the following steps:
When the storage pressure P c in the low-pressure storage unit is higher than the set pressure threshold value P, the vacuum pump works and starts to vacuumize;
In the vacuumizing process, after the vacuumizing pressure P reaches the pressure threshold value P, the vacuum pump continues to work to carry out supplementary vacuumizing, and vacuumizing is stopped when the supplementary vacuumizing time period T reaches the set time threshold value T.
Preferably, during the vacuum pumping process, the vacuum pump sequentially operates at a first voltage U 1, a second voltage U 2, a … … ith voltage U i … … nth voltage U n, wherein U 1＞U2＞……＞Ui＞……＞Un, n > 1, and n is a positive integer.
Preferably, the vacuum pump runs at an ith voltage U i to a pressure within the low-pressure storage unit as an ith pressure threshold P i, wherein the vacuum pump runs at an ith voltage U i to an ith pressure threshold P i for an ith duration T i; wherein P n is the pressure threshold P.
Preferably, U i+1：Ui E [0.4,0.8].
The refrigerator vacuum pumping control method according to claim 2, wherein:
In the vacuumizing process, the vacuum pump sequentially runs for m periods with a first voltage U 1, a second voltage U 2, a … … ith voltage U i … … nth voltage U n, wherein m is more than 1, and m is a positive integer;
In a j-th period, the vacuum pump runs to a ji-th pressure threshold value P ji at an i-th voltage U i, and the vacuum pump runs to a ji-th pressure threshold value P ji for an i-th duration T i at an i-th voltage U i; wherein P mn is the pressure threshold P; wherein j is more than or equal to 1 and less than or equal to m, and j is a positive integer.
Preferably, n=2, u 1＞U2 =0v.
Preferably, the time from when the vacuum pump starts to perform the vacuum pumping command to when the vacuum pump normally performs the vacuum pumping command is T 0, and when U i：U1 epsilon [0.4,1), T i∈(0,t0).
Preferably, T i≥t0 is when U i：U1 E [0,0.4 ].
Preferably, the pressure threshold P is less than or equal to 0.88 atmospheres and less than or equal to 0.9 atmospheres.
A refrigerator for implementing the above refrigerator vacuum control method.
Compared with the prior art, the invention has the advantages and positive effects that:
The invention provides a refrigerator vacuumizing control method, which comprises a refrigerator body, a low-pressure storage unit and a vacuum pump, wherein the refrigerator body is used for defining a low-temperature storage room; the vacuumizing control method comprises the following steps: when the storage pressure P c in the low-pressure storage unit is higher than the set pressure threshold value P, the vacuum pump works and starts to vacuumize; in the vacuumizing process, when the vacuumizing pressure P reaches a pressure threshold value P, the vacuum pump continues to work to supplement vacuumizing, and vacuumizing is stopped when the supplementing vacuumizing time period T reaches a set time threshold value T; in this embodiment, after the vacuumizing pressure P is reduced to the pressure threshold P, controlling the vacuumizing process by time to react the vacuumizing vacuum degree by pressure in a higher pressure range, and reacting the vacuumizing vacuum degree by time in a lower pressure range and ending vacuumizing; the above arrangement enables more sensitive monitoring and control of the evacuation process.
Drawings
Fig. 1 is a schematic view of the overall structure of a refrigerator according to the present invention;
fig. 2 is a schematic structural view of a low pressure storage unit of the refrigerator of the present invention;
FIG. 3 is a schematic block diagram of a refrigerator vacuum system of the present invention;
FIG. 4 is a flowchart illustrating a method for controlling vacuum pumping of a refrigerator according to an embodiment of the present invention;
FIG. 5 is a graph showing the corresponding vacuum pressure versus pumping time for a low pressure storage unit of different fixed volumes when the refrigerator of the present invention is pumped down;
FIG. 6 is a voltage diagram of a vacuum pump in a second embodiment of a method for controlling vacuum pump in a refrigerator according to the present invention;
FIG. 7 is a voltage diagram of a vacuum pump in a second embodiment of a method for controlling vacuum pump in a refrigerator according to the present invention;
FIG. 8 is a flowchart illustrating a second embodiment of a method for controlling vacuum pump in a refrigerator according to the present invention;
FIG. 9 is a timing diagram of the refrigerator vacuum pump power application process of the present invention;
FIG. 10 is a voltage diagram of a vacuum pump in a third embodiment of a method for controlling vacuum pump in a refrigerator according to the present invention;
FIG. 11 is a voltage diagram of a vacuum pump in a third embodiment of a method for controlling vacuum pump in a refrigerator according to the present invention;
Fig. 12 is a flowchart of a third embodiment of a method for controlling vacuum pumping of a refrigerator according to the present invention.
In the above figures: a case 1; a low pressure storage unit 2; a vacuum pump 3; a low temperature storage room 4; a control system 10; a control module 20; a timing module 30; a setting module 40; a judgment module 50; a pressure detection module 60.
Detailed Description
The present application will be further described with reference to specific examples so that those skilled in the art may better understand the present application and practice it, but the scope of the present application is not limited to the scope described in the specific embodiments. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be arbitrarily combined with each other.
It should be noted that the description of "first", "second", etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implying an indication of the number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Example 1
1-2, A refrigerator includes a cabinet 1 defining an insulated low temperature storage compartment 4, the cabinet 1 rotatably coupled with a door; the refrigerator 1 is provided with a low pressure storage unit 2 which can be maintained in a low pressure state, and an air extracting device for extracting air from the low pressure storage unit 2. The air extraction means may comprise a vacuum pump 3, an air extraction line connected between the vacuum pump 3 and the low pressure reservoir unit 2, and an air exhaust line connected to the vacuum pump 3. In the present embodiment, the low pressure storage unit 2 is provided in the low temperature storage compartment 4, and the vacuum pump 3 is provided in the case 1. The vacuum pump 3 works, and the gas in the low-pressure storage unit 2 sequentially passes through the air suction pipeline, the vacuum pump 3 and the exhaust pipeline and is exhausted through the exhaust pipeline.
It should be noted that the refrigerator of the present invention is not limited to the structure in which the low-pressure storage unit 2 is provided in the low-temperature storage compartment 4, and may include other forms such as the low-pressure storage unit 2 provided on a refrigerator door; namely, the evacuation control method of the present invention is applicable to all refrigerators having a low pressure storage unit 2 of a fixed volume and an evacuation device for a vacuum pump 3 communicating with the low pressure storage unit 2 to evacuate air in the low pressure storage unit 2. The vacuum-pumping method of the present invention is not limited to the specific arrangement of the vacuum-pumping structure of the refrigerator, and the description of the structure herein is merely given by way of example.
As shown in fig. 3, the refrigerator is provided with a control system 10 for controlling the operation states of the respective components of the refrigerator to realize the control of the refrigerator. The control system 10 includes a control module 20, a timing module 30, a setting module 40, a determination module 50, and a pressure detection module 60. The control module 20 is connected to the timing module 30, the setting module 40, the judging module 50 and the pressure detecting module 60, and performs information interaction with the timing module 30, the setting module 40, the judging module 50 and the pressure detecting module 60, and controls the refrigerator to perform vacuumizing.
The setting module 40 is configured to obtain various standard parameters of the refrigerator operation, including, but not limited to, a pressure parameter, a time parameter, and the like. In this embodiment, the setting module 40 obtains the pressure threshold P and the time threshold T during the vacuumizing process.
The timing module 30 is used for recording time, and may be specifically configured as a timer. In this embodiment, the timing module 30 supplements the vacuum pump 3 with a time period t after the pressure in the low-pressure storage unit 2 reaches the pressure threshold P during the vacuum pumping process.
The pressure detection module 60 is used for detecting the vacuumizing pressure p in the low-pressure storage unit 2 when vacuumizing and the storage pressure p c in the low-pressure storage unit 2 when not vacuumizing; the pressure detection module 3 communicates with the low pressure reservoir unit 2 to monitor the pressure within the low pressure reservoir unit 2 in real time. In the present invention, the pressure detection module 60 is disposed at the rear end of the low pressure storage unit 2 and is always in communication with the inner cavity of the low pressure storage unit 2, so as to sense the pressure in the low pressure storage unit 2 in the whole course.
The judging module 50 is configured to receive the time period T of the supplementary vacuum pump 3 acquired by the timing module 30 after the pressure in the low-pressure storage unit 2 reaches the pressure threshold P, the vacuum pressure P and the storage pressure P c acquired by the pressure detecting module 60, judge the magnitude relation between the supplementary vacuum pump time period T and the corresponding time threshold T, judge the magnitude relation between the vacuum pressure P and the set pressure threshold P, and judge the magnitude relation between the storage pressure P c and the set pressure threshold P.
Specifically, the method for controlling the vacuumizing of the refrigerator comprises the steps that in the vacuumizing process of a vacuum pump 3, a pressure detection module 60 monitors the vacuumizing pressure P in a low-pressure storage unit 2 in real time, when the vacuumizing pressure in the low-pressure storage unit 2 reaches a pressure threshold value P, a timing module is adopted for timing so as to monitor the supplementary vacuumizing duration T, and when the supplementary vacuumizing duration T reaches a set time threshold value T, the vacuumizing operation is ended. When the evacuation is completed, the pressure value in the low-pressure storage unit 2 is recorded as the final pressure P m.
Specifically, as shown in fig. 4, the vacuum pumping control method comprises the following specific steps:
S1: starting vacuumizing; the method specifically comprises the following steps:
S11: the pressure detection module 60 monitors the reservoir pressure p c within the low-pressure reservoir unit 2;
s12: judging that the reservoir pressure P c > the pressure threshold P? If yes, the vacuum pump 3 works, vacuumizing is carried out, and step S2 is executed; if not, executing step S11;
S2: vacuumizing; the method comprises the following specific steps:
S21: the pressure detection module 60 monitors the vacuuming pressure p in the low-pressure storage unit 2;
s22: judging that the vacuuming pressure P is greater than the pressure threshold P? If yes, go to step S21; if not, the timer starts to count, and the supplementary vacuumizing duration t is recorded, and the step S23 is executed;
s23: judging that the time length T of the supplementary vacuumizing is less than the time threshold T? If yes, the timer keeps timing; if not, resetting the timer; the vacuum pump 3 stops working, and the vacuumizing is finished.
In this embodiment, the opening of the vacuum is controlled by the pressure in the low-pressure storage unit 2, and the first stage in the vacuum process is also controlled by the pressure in the low-pressure storage unit 2, and the end of the vacuum is controlled by the time after the pressure threshold P is reached. The opening pressure threshold of the vacuumizing is equal to the pressure threshold when the control parameter (pressure or time) is changed in the vacuumizing process. That is, only one pressure threshold is set in the present embodiment, and on the one hand, the opening of the vacuum is determined, and on the other hand, the switching of the control parameter (pressure or time) is determined.
When the vacuum is pumped, the pressure threshold value P for opening the vacuum pumping is higher than the final pressure P m after the vacuum pumping is finished, so that the vacuum state of the low-pressure storage unit 2 is limited in a certain low-pressure range.
As shown in fig. 5, the curves of vacuum pressure and pumping time corresponding to the pumping of the low-pressure storage units 2 with different fixed volumes; from fig. 5, it can be derived that: when the low-pressure storage unit 2 with a fixed volume is vacuumized, the vacuumizing pressure p in the low-pressure storage unit 2 is continuously reduced, but along with the accumulation of vacuumizing time, the speed of reducing the vacuumizing pressure p in the low-pressure storage unit 2 is gradually reduced, correspondingly, the pressure detection unit 60 is limited by the sensitivity of the detection pressure value, the pressure change condition of the reaction tends to be insignificant, and the accumulation of time can intuitively reflect the reduction of the vacuum degree. In this embodiment, after the evacuation pressure is reduced to the pressure threshold value P, the evacuation process is controlled by time, which is not affected by the evacuation pressure in the low-pressure storage unit 2, to reflect the degree of vacuum of the evacuation in time and end the evacuation in a lower pressure range. The vacuum degree of the vacuumizing is reacted through pressure in a higher pressure range, the vacuum degree of the vacuumizing is reacted in time in a lower pressure range, and the vacuumizing is finished; the vacuum process can be monitored and controlled more sensitively, so that the vacuum process is accurate and the vacuum effect is effectively ensured.
After the vacuumizing pressure P reaches the pressure threshold P, time is adopted for control, and the vacuumizing pump 3 is controlled to vacuumize for a period of time reaching the time threshold T, and then vacuumizing is stopped. In this embodiment, the pressure threshold P may be set to 0.88 atm to 0.9 atm.
The above time threshold T is set according to the flow rate of the vacuum pump 3; for a low pressure storage unit 2 with a volume of 15L, when the flow rate of the vacuum pump 3 is about 1L/min, the time threshold t=1min, i.e. the duration of continued evacuation is 1 minute. When the flow rate of the pump is about 2.5L/min, the time threshold T=0.5 min, namely the duration of continuous vacuumizing is 0.5 min. To ensure that the final pressure P m in the low-pressure reservoir unit 2 is < 0.8 atmospheres at the end of the evacuation. The above relationship is set in the above refrigerator control system: when a final pressure (e.g., 0.8 atm) lower than the pressure threshold P is reached, the volume V of the low pressure reservoir unit 2-the flow rate S of the vacuum pump 3-the function of increasing the pumping time threshold T may be determined by inputting or sensing or uploading the volume V of the low pressure reservoir unit 2 and monitoring the flow rate S of the vacuum pump 3 to be suitable for controlling the pumping operation of various volumes V of the low pressure reservoir unit 2 or the flow rate S of the vacuum pump 3.
Example two
This example is a further refinement of the evacuation process of example one. Specific:
In this embodiment, the setting module 40 obtains a first voltage U 1, a second voltage U 2, an i-th voltage U i … …, an n-th voltage U n, a first pressure threshold P 1, a second pressure threshold P 2, i-th pressure thresholds P i, … …, and an n-th pressure threshold P n during the vacuumizing process; wherein U1＞U2＞……＞Ui＞……＞Un,P1＞P2＞……＞Pi＞……＞Pn,n＞1, and n are positive integers; wherein the vacuum pump 3 is operated at the i-th voltage U i until the pressure in the low-pressure storage unit 2 is the i-th pressure threshold P i.
In this embodiment, in the whole vacuumizing process, the vacuum pump 3 is controlled to sequentially operate at the first voltage U 1, the second voltage U 2, the … … ith voltage U i … … nth voltage U n, so that noise is controlled by the power of the vacuumizing vacuum pump 3, and noise reduction is effectively realized. Wherein P n is the pressure threshold P. Specifically, as shown in fig. 6, when n=2, the vacuum pump 3 is provided with two voltage values; as shown in fig. 7, when n=4, the vacuum pump 3 is provided with four voltage values.
The pressure detection module 60 detects a first pressure p 1 in the low-pressure storage unit 2 when the vacuum pump 3 is operated at a first voltage U 1, second pressures p 2, … … in the low-pressure storage unit 2 when operated at a second voltage U 2, i-th pressures p i, … … in the low-pressure storage unit 2 when operated at an i-th voltage U i, and an n-th pressure p n in the low-pressure storage unit 2 when operated at an n-th voltage U n.
In this embodiment, the judging module 50 is configured to receive the first pressure P 1 in the low-pressure storage unit 2 when the vacuum pump 3 is operated at the first voltage U 1, the second pressures P 2, … … in the low-pressure storage unit 2 when the vacuum pump is operated at the second voltage U 2, the ith pressures P i, … … in the low-pressure storage unit 2 when the vacuum pump is operated at the ith voltage U i, and the nth pressure P n in the low-pressure storage unit 2 when the vacuum pump is operated at the nth voltage U n, and judge the magnitude relation between the first pressure P 1, the second pressures P 2, … …, the ith pressures P i, … …, and the nth pressures P n and the corresponding first pressure threshold P 1, the second pressure thresholds P 2, … …, the ith pressure threshold P i … …, and the nth pressure threshold P n, respectively.
Specifically, the method for controlling the vacuum pumping of the refrigerator includes that the vacuum pump 3 sequentially runs to the first pressure threshold P 1 at the first voltage U 1, runs to the second pressure threshold P 2, … … at the second voltage U 2, runs to the second pressure threshold P i, … … at the ith voltage Ui, runs to the pressure in the low-pressure storage unit 2, and runs to the nth pressure threshold P n at the nth voltage Un. And after the vacuumizing pressure in the low-pressure storage unit 2 reaches an nth pressure threshold P n, continuing vacuumizing, and stopping vacuumizing when the duration of continuing vacuumizing reaches a time threshold T. I.e. the voltage value on the vacuum pump 3 remains running in a decreasing trend before the pressure threshold P is reached during the evacuation. After the pressure threshold value P is reached, the voltage value on the vacuum pump 3 can be kept unchanged or the trend of reduction can be kept, and the invention is not limited; in this embodiment, after the pressure threshold P is reached, the voltage value on the vacuum pump 3 remains unchanged.
As shown in fig. 8, the vacuum pumping control method comprises the following specific steps:
s' 1: starting vacuumizing; the method specifically comprises the following steps:
S' 11: the pressure detection module 60 monitors the reservoir pressure p c within the low-pressure reservoir unit 2;
S' 12: judging that the reservoir pressure P c > the pressure threshold P? If yes, the vacuum pump 3 works, vacuumizing is carried out, and step S' 2 is executed; if not, executing the step S' 11;
s' 2: i=i+1, where i is initially 0 and is an integer;
S' 3: vacuumizing; the method comprises the following specific steps:
S' 31: the pressure detection unit detects an i-th pressure p i, and the vacuum pump 3 operates at an i-th voltage U i;
S' 32: judging that the i-th pressure P i > the i-th pressure threshold P i? If yes, executing step S' 31; if not, executing the step S' 4;
S' 4: judging i < n? If yes, executing the step S' 2; if not, the vacuum pump 3 continues to work, the timer starts to count, the time length t of the supplementary vacuum pumping is recorded, and the step S' 5 is executed.
S' 5: judging that the time length T of the supplementary vacuumizing is less than the time threshold T? If yes, the timer keeps timing; if not, resetting the timer; the vacuum pump 3 stops working, and the vacuumizing is finished.
In the above control method, the first voltage U 1 > the second voltage U 2 > … … > the i-th voltage U i > … … > the n-th voltage U n, the first voltage U 1 is the full voltage applied to the vacuum pump 3, and the voltage value applied to the vacuum pump 3 tends to decrease during the vacuum pumping process, so as to reduce the working power of the vacuum pump 3, thereby reducing noise. The counting of i above may be implemented by a counter.
From fig. 5, it can be derived that: when the low-pressure storage unit 2 with fixed volume is vacuumized, the working resistance of the vacuum pump 3 is continuously increased along with the accumulation of the vacuumization time of the vacuum pump 3, so that the noise in the vacuumization process is continuously increased, namely, the vacuumization is more laborious along with the accumulation of the vacuumization time. In the above embodiment, by controlling the working voltage of the vacuum pump 3 when vacuumizing, the vacuum pump 3 operates at different voltages at different stages, and ensures that the operating voltage of the vacuum pump 3 keeps a trend of decreasing along with the accumulation of vacuumizing time in one period, so as to effectively reduce the noise generated by the vacuum pump 3, thereby reducing the noise, optimizing the overall performance of the refrigerator, and improving the user experience.
As shown in fig. 9, which is a timing chart of the power application process of the vacuum pump 3. In the control method, a vacuumizing instruction (including an instruction of starting vacuumizing specification and vacuumizing after voltage change) is sent out and is executed by the vacuum pump 3, but a period of time t 0 is needed from the start of vacuumizing to the normal play of the vacuum pump 3, and the period of time is recorded as initial time t 0; during this time t 0, the power of the vacuum pump 3 tends to increase gradually. In the invention, the diaphragm vacuum pump 3 is adopted, and the noise of the diaphragm vacuum pump 3 is generated by the movement of rubber parts in the diaphragm vacuum pump; as the power of the vacuum pump 3 increases, the deformation of the rubber member in the vacuum pump 3 increases, and the larger the power value, the rubber member reaches the maximum deformation state, thereby generating noise.
In the invention, when n first voltage U 1, second voltage U 2 and … … ith voltage U i … … and nth voltage U n are set, the time required for vacuumizing to an ith pressure threshold P i by normal and effective operation of the ith voltage U i is the ith time length T i, and when the ith pressure threshold P i is set, the corresponding ith time length T i is set as follows: the i-th time period T i corresponding to the voltage value satisfying U i：U1 e [0.4,1) is defined as T i∈(0,t0). The i-th time period T i corresponding to the voltage value of U i：U1 e [0,0.4) is defined as T i≥t0. That is, when the i-th pressure threshold P i is set, the i-th pressure threshold P i is determined according to the definition of the i-th time period T i to which it corresponds.
The corresponding time length of the vacuum pump 3 running at the large voltage value is limited to be smaller than the initial time T 0, and the ith pressure threshold P i is determined according to the limitation of the ith time length T i, so that the rubber part in the vacuum pump 3 is prevented from reaching the maximum deformation state when the vacuum pump 3 normally and effectively runs at the ith voltage U i, and noise is avoided; the corresponding time length of the vacuum pump 3 running at a smaller voltage is limited to be not less than the range of the initial time t 0, at this time, the power of the vacuum pump 3 is not large enough to enable the rubber part in the vacuum pump 3 to reach the maximum deformation state, that is, the possibility of noise generation does not exist, and a large working time length can be set to maintain the working efficiency of the vacuum pump 3. The reduction of the voltage value on the vacuum pump 3 and the limitation of the target pressure value corresponding to the voltage value can effectively avoid the noise generated by the vacuum pump 3, maintain the working efficiency of the vacuum pump 3 and prolong the service life of the vacuum pump 3.
In this embodiment, n=2, and U 2：U1 e 0.4 and 0.8 are set, so that noise can be effectively reduced, the total duration of vacuum pumping can be effectively limited, and the vacuum pumping efficiency can be ensured.
It should be noted that, in the present invention, the start and stop of the vacuum pump 3 running at different voltages can also be controlled directly by the time period. In addition, as the evacuation proceeds, the operating current I of the vacuum pump 3 is also gradually reduced. Therefore, the start and stop of the vacuum pump 3 running at different voltages can be controlled by the working current I of the vacuum pump 3. That is, in the actual setting monitoring, the pressure detection module is not limited to the above to determine whether to change the voltage value; it can reflect the working time length by setting a current monitoring unit or a timing module for monitoring the working current I of the vacuum pump 3 to judge whether to change the voltage. And will not be described in detail herein.
A current monitoring unit for monitoring the working current I of the vacuum pump 3 is arranged in the refrigerator; the vacuum pump 3 is operated with the ith voltage U i until the operating current I of the vacuum pump 3 is I i,I1＞I2＞……＞Ii＞……＞In,In, which is the target current value for vacuumizing. The working current of the vacuum pump 3 can be directly used for direct reaction, the working time length can be determined by directly reaching the specific working current when the product is designed, and the transformation of directly determining the voltage value is carried out by the working time length.
Example III
The principle of the embodiment is the same as that of the second embodiment, and the main difference is that a plurality of cycles of circulation are set in the refrigerator vacuumizing control method to reach a pressure threshold value P; setting a plurality of voltage values and cycling for a plurality of periods; namely, in a single period of the vacuumizing process, the voltage value on the vacuum pump 3 keeps running in a trend of decreasing, and the vacuumizing process is circularly carried out for m periods; where j represents the j-th cycle.
Specifically, as the normal and effective evacuation proceeds, the pressure in the low-pressure storage unit 2 is continuously reduced, and in the corresponding jth cycle, the vacuum pump 3 is operated with the ith voltage U i until the pressure in the low-pressure storage unit 2 is the jth pressure threshold P ji; the pressure detected by the pressure detection module is ji pressure p ji. And after the vacuumizing pressure in the low-pressure storage unit 2 reaches an mn-th pressure threshold value P mn, vacuumizing is continued, and vacuumizing time is kept to reach a time threshold value T. I.e. the voltage value on the vacuum pump 3 remains running in a decreasing trend before the pressure threshold P is reached during the evacuation. Where P jn is the target pressure for the j-th cycle and P mn is the pressure threshold P for the evacuation.
Specifically, as shown in fig. 10, in the present embodiment, when n=2, the vacuum pump 3 is operated with two voltage values set in one cycle; as shown in fig. 11, when n=4, the vacuum pump 3 is operated with four voltage values set in one cycle.
As shown in fig. 12, the specific steps of the refrigerator vacuum control method are as follows:
s' 1: starting vacuumizing; the method specifically comprises the following steps:
S' 11: the pressure detection module 60 monitors the reservoir pressure p c within the low-pressure reservoir unit 2;
S' 12: judging that the reservoir pressure P c > the pressure threshold P? If yes, the vacuum pump 3 works, vacuumizing is carried out, and step S' 2 is executed; if not, executing the step S' 11;
s' 2: j=j+1, where j is initially 0 and is an integer;
s' 3: i=i+1, where i is initially 0 and is an integer;
S' 4: vacuumizing; the method comprises the following specific steps:
S' 41: the pressure detection unit detects the ji pressure p ji, and the vacuum pump 3 operates at the i-th voltage U i;
S' 42: judging that ji pressure P ji > ji pressure threshold P ji? If yes, go to step S' 41; if not, executing the step S' 5;
S' 5: judging i < n? If yes, executing step S' 3; step S' 6 is performed.
S' 6: judging j < m? If yes, executing the step S' 2; if not, the vacuum pump 3 continues to work, the timer starts to count, and the supplementary vacuumizing duration t is recorded;
s' 7: judging that the time length T of the supplementary vacuumizing is less than the time threshold T? If yes, the timer keeps timing; if not, resetting the timer; the vacuum pump 3 stops working, and the vacuumizing is finished.
In the above control method, in a single period, the first voltage U 1 > the second voltage U 2 > … … > the i-th voltage U i > … … > the n-th voltage U n, the first voltage U 1 is the full voltage applied to the vacuum pump 3, and in the process of vacuumizing, the voltage value applied to the vacuum pump 3 tends to decrease, so as to reduce the working power of the vacuum pump 3, thereby reducing noise; the plurality of cycles are repeated to effectively ensure the vacuum pumping efficiency while reducing noise.
In this embodiment, the setting manner of the voltage value U i corresponding to the i-th pressure threshold P i is the same as that of the second embodiment, so that the description thereof will not be repeated.
In the embodiment, n=2, and U 2：U1 epsilon [0,0.8] is set, so that noise can be effectively reduced, the total duration of vacuumizing is effectively limited, and the vacuumizing efficiency is ensured. The i-th period T i corresponding to the voltage value of U i：U1 e [0.4,1) is defined as T i∈(0,t0),Ui：U1 e [0,0.4 ] and the i-th period T i corresponding to the voltage value of T i≥t0. In this embodiment, the first voltage U 1 is set to the full voltage, U 1＞U2＝0V;T1＝T2 =1s.
In the first and second embodiments, when the second voltage U 2 is equal to 0V, the conversion between the voltage values of the first voltage U 1 and the second voltage U 2 is completed by the voltage transformation device; when the second voltage U 2 =0v is set, the conversion between the voltage values of the first voltage U 1 and the second voltage U 2 can be achieved by a relay.
After the vacuumizing pressure is reduced to a pressure threshold value P, controlling the vacuumizing process through time to react the vacuumizing vacuum degree through pressure in a higher pressure range, and reacting the vacuumizing vacuum degree in time in a lower pressure range and ending vacuumizing; the device can monitor and control the vacuumizing process more sensitively, so that the vacuumizing process is accurate. On the other hand, the invention controls the working voltage of the vacuum pump 3 when vacuumizing, so that the vacuum pump 3 operates at different voltages at different stages, and ensures that the operating voltage of the vacuum pump 3 keeps a reduced trend in a unit period, thereby effectively reducing the noise generated by the vacuum pump 3.
The present invention is not limited to the above-mentioned embodiments, and any equivalent embodiments which can be changed or modified by the technical content disclosed above can be applied to other fields, but any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical substance of the present invention without departing from the technical content of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (5)
1. The refrigerator vacuumizing control method is characterized in that: the refrigerator comprises a refrigerator body, a low-pressure storage unit and an air extracting device, wherein the refrigerator body is used for limiting a heat-insulating low-temperature storage room, the air extracting device is communicated with the low-pressure storage unit and used for extracting air in the low-pressure storage unit, and the air extracting device comprises a vacuum pump and an air extracting pipeline; the refrigerator further comprises a control system, the control system comprises a control module, a timing module, a setting module, a judging module and a pressure detection module, and the vacuumizing control method comprises the following steps:
When the storage pressure P c in the low-pressure storage unit is higher than the set pressure threshold value P, the vacuum pump works and starts to vacuumize;
In the vacuumizing process, after the vacuumizing pressure P reaches the pressure threshold value P, the vacuum pump continues to work to carry out supplementary vacuumizing, and vacuumizing is stopped when the supplementary vacuumizing time period T reaches a set time threshold value T;
In the vacuumizing process, the vacuum pump sequentially runs at a first voltage U 1, a second voltage U 2 and a … … ith voltage U i … … nth voltage U n, wherein U 1＞U2＞……＞Ui＞……＞Un, n is more than 1, and n is a positive integer;
The vacuum pump runs to the pressure in the low-pressure storage unit at an ith voltage U i to be an ith pressure threshold P i, wherein the vacuum pump runs to the ith pressure threshold P i at an ith voltage U i for an ith duration T i; wherein P n is the pressure threshold P;
Or in the vacuumizing process, the vacuum pump sequentially runs for m periods by a first voltage U 1, a second voltage U 2 and a … … ith voltage U i … … nth voltage U n, wherein m is more than 1, m is a positive integer, U 1＞U2＞……＞Ui＞……＞Un, n is more than 1, and n is a positive integer in a single period;
In a j-th period, the vacuum pump runs to a ji-th pressure threshold value P ji at an i-th voltage U i, and the vacuum pump runs to a ji-th pressure threshold value P ji for an i-th duration T i at an i-th voltage U i; wherein P mn is the pressure threshold P; wherein j is more than or equal to 1 and less than or equal to m, j is a positive integer;
The time from the start of the vacuumizing command to the normal play of the vacuum pump is T 0, when U i：U1 epsilon [0.4,1 ], T i∈（0,t0), when U i：U1 epsilon [0,0.4), T i≥t0, the vacuum pump adopts a diaphragm vacuum pump, noise of the diaphragm vacuum pump is generated by movement of rubber parts in the diaphragm vacuum pump, as the power of the vacuum pump is increased, deformation of the rubber parts in the vacuum pump is also increased, the larger the power value causes the rubber parts to reach the maximum deformation state so as to generate noise, the corresponding time length of operation of the vacuum pump with a large voltage value is limited to be smaller than the initial time T 0, and the ith pressure threshold P i is determined according to the limit of the ith time length T i, so that the rubber parts in the vacuum pump are prevented from reaching the maximum deformation state when the vacuum pump is normally and effectively operated with the ith voltage U i.
2. The method for controlling vacuum pumping of a refrigerator according to claim 1, wherein: u i+1：Ui E [0.4,0.8].
3. The method for controlling vacuum pumping of a refrigerator according to claim 1, wherein: n=2, u 1＞U2 =0v.
4. The method for controlling vacuum pumping of a refrigerator according to claim 1, wherein: the pressure threshold P is less than or equal to 0.88 atm and less than or equal to 0.9 atm.
5. A refrigerator, characterized in that: the refrigerator is used for realizing the refrigerator vacuumizing control method according to any one of claims 1-4.
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