CN105587652B - Linear compressor and its control method, device, electric appliance - Google Patents
Linear compressor and its control method, device, electric appliance Download PDFInfo
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- CN105587652B CN105587652B CN201610094999.XA CN201610094999A CN105587652B CN 105587652 B CN105587652 B CN 105587652B CN 201610094999 A CN201610094999 A CN 201610094999A CN 105587652 B CN105587652 B CN 105587652B
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000010586 diagram Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005057 refrigeration Methods 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
- 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
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
The embodiment of the invention discloses a kind of linear compressor and its control method, device, electric appliances, the stroke of piston determines when distance of the initial position of the piston of linear compressor in the cylinder apart from top dead centre operates in predetermined operating mode based on linear compressor, and duration when linear compressor operates in predetermined operating mode is more than duration when linear compressor operates in maximum duty；And, in non-predetermined operating mode, by applying alternating voltage and DC voltage to linear compressor, control the size of alternating voltage and the size and Orientation of DC voltage, so that the target stroke that the traveled distance of piston is equal to when piston reaches top dead centre, in the case where not increasing refrigerating capacity with the volumetric efficiency of smaller target stroke raising linear compressor.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a linear compressor, a control method and a control device of the linear compressor, and an electric appliance.
Background
The linear compressor is an electromechanical product integrating a linear motor providing a driving force and the compressor, and has become a hot point of research in the household appliance industry because the efficiency of the linear compressor is higher than that of the traditional reciprocating piston compressor.
The linear compressor performs variable volume by controlling the stroke of the piston moving in the cylinder, and because the linear compressor does free piston movement, the center position of the piston movement can deviate towards the direction far away from the top dead center under the action of gas force, so that the piston can not reach the top dead center when reaching the target stroke, and the volumetric efficiency of the linear compressor is reduced. Therefore, in order to achieve high volumetric efficiency, piston movement should be allowed as far as possible to reach Top Dead Center (TDC), as well as preventing piston movement beyond TDC from hitting the cylinder. Based on this, when designing the initial installation position of piston at present, will usually design according to the maximum operating mode of piston, guarantee that the free motion of piston just reaches top dead center when the maximum stroke. Under other working conditions, in order to improve the volumetric efficiency of the linear compressor and enable the piston to reach the top dead center, one solution is to increase the stroke of the piston movement.
However, the increase of the stroke leads to an increase of the cooling capacity, but in many cases, a large cooling capacity is not required for household appliances such as refrigerators. Therefore, how to improve the volumetric efficiency of the linear compressor without increasing the cooling capacity is a problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a linear compressor, a control method and a control device thereof, and an electric appliance, so as to improve the volumetric efficiency of the linear compressor under the condition of not increasing the refrigerating capacity.
In order to achieve the purpose, the invention provides the following technical scheme:
a linear compressor control method is applied to an electric appliance, the distance between the initial position of a piston of a linear compressor in a cylinder and a top dead center is determined based on the target stroke of the piston when the linear compressor operates in a preset working condition, and the time length of the linear compressor when the linear compressor operates in the preset working condition is longer than the time length of the linear compressor when the linear compressor operates in the maximum working condition; the method comprises the following steps:
when the linear compressor operates under the preset working condition, only applying alternating voltage to the linear compressor, and controlling the magnitude of the applied alternating voltage to enable the actual stroke of the piston to be equal to the target stroke under the preset working condition;
when the linear compressor operates under a non-preset working condition, applying alternating current voltage and direct current voltage to the linear compressor, and controlling the magnitude of the alternating current voltage and the magnitude and direction of the direct current voltage to enable the actual stroke of the piston to be equal to the target stroke under the non-preset working condition when the piston reaches the top dead center.
In the above method, preferably, when the linear compressor is operated in an unpredicted operating condition, the controlling the magnitude of the ac voltage and the magnitude and direction of the dc voltage so that the actual stroke of the piston when the piston reaches the top dead center is equal to the target stroke in the unpredicted operating condition includes:
when the piston reaches the top dead center by applying alternating voltage to the linear compressor, comparing the actual stroke of the piston with the target stroke under the non-preset working condition;
and changing the magnitude of the alternating current voltage applied to the linear compressor according to the comparison result, and applying direct current voltage in a preset direction to the linear compressor until the actual stroke of the piston reaches the top dead center, wherein the actual stroke of the piston is the target stroke under the non-preset working condition.
In the above method, preferably, the changing the magnitude of the ac voltage applied to the linear compressor according to the comparison result, and applying the dc voltage in the preset direction to the linear compressor until the actual stroke of the piston reaches the target stroke under the non-predetermined working condition includes:
if the actual stroke of the piston is smaller than the target stroke under the non-preset working condition, applying direct current voltage in a first direction to the linear compressor to enable the motion center of the piston to deviate towards the direction far away from the top dead center, and increasing the alternating current voltage applied to the linear compressor until the piston reaches the top dead center, wherein the actual stroke of the piston is the target stroke under the non-preset working condition;
if the actual stroke of the piston is larger than the target stroke under the non-preset working condition, reducing the alternating current voltage applied to the linear compressor, and applying direct current voltage in a second direction to the linear compressor, so that the motion center of the piston deviates towards the direction close to the top dead center until the actual stroke of the piston reaches the target stroke under the non-preset working condition.
In the method, preferably, the time period of the linear compressor operating under the predetermined operating condition is longer than the time period of the linear compressor operating under any one non-predetermined operating condition.
A linear compressor control device is applied to an electric appliance, the distance between the initial position of a piston of a linear compressor in a cylinder and a top dead center is determined based on the target stroke of the linear compressor when the linear compressor operates in a preset working condition, and the time length of the linear compressor when the linear compressor operates in the preset working condition is longer than the time length of the linear compressor when the linear compressor operates in a maximum working condition; the device comprises:
the first control module is used for applying alternating voltage to the linear compressor only when the linear compressor operates under the preset working condition, and the actual stroke of the piston is equal to the target stroke under the preset working condition by controlling the magnitude of the applied alternating voltage;
and the second control module is used for applying alternating current voltage and direct current voltage to the linear compressor when the linear compressor operates under a non-preset working condition, and controlling the magnitude of the alternating current voltage and the magnitude and direction of the direct current voltage to enable the actual stroke of the piston to be equal to the target stroke under the non-preset working condition when the piston reaches the top dead center.
Preferably, the above apparatus, wherein the second control module includes:
the comparison unit is used for comparing the actual stroke of the piston with the target stroke under the non-preset working condition when the piston reaches the top dead center by applying alternating voltage to the linear compressor;
and the control unit is used for changing the magnitude of the alternating-current voltage applied to the linear compressor according to the comparison result and applying direct-current voltage in a preset direction to the linear compressor until the actual stroke of the piston reaches the top dead center, wherein the actual stroke of the piston is the target stroke under the non-preset working condition.
In the above apparatus, preferably, the control unit includes:
the first control subunit is used for applying a direct current voltage in a first direction to the linear compressor if the actual stroke of the piston is smaller than the target stroke under the non-preset working condition, so that the motion center of the piston deviates to the direction far away from the top dead center, and increasing the alternating current voltage applied to the linear compressor until the actual stroke of the piston reaches the target stroke when the piston reaches the top dead center;
and the second control subunit is used for reducing the alternating-current voltage applied to the linear compressor and applying a direct-current voltage in a second direction to the linear compressor if the actual stroke of the piston is greater than the target stroke under the non-preset working condition, so that the motion center of the piston deviates towards the direction close to the top dead center until the actual stroke of the piston reaches the target stroke under the non-preset working condition.
In the above device, preferably, the time length of the linear compressor operating under the predetermined operating condition is longer than the time length of the linear compressor operating under any one non-predetermined operating condition.
A linear compressor comprises a cylinder and a piston arranged in the cylinder, wherein the distance between the initial position of the piston in the cylinder and the top dead center is determined based on the target stroke of the linear compressor when the linear compressor operates in a preset working condition; the time length of the linear compressor running under the preset working condition is longer than the time length of the linear compressor running under the maximum working condition.
In the above linear compressor, preferably, the time period of the linear compressor operating under the predetermined working condition is longer than the time period of the linear compressor operating under any one non-predetermined working condition.
In the above linear compressor, preferably, the distance from the initial position of the piston in the cylinder to the top dead center is:
and the linear compressor operates at half of the target stroke of the piston movement under the preset working condition, and the difference of the preset offset corresponding to the preset working condition.
An appliance comprising a linear compressor as claimed in any one of the preceding claims and a linear compressor control means as claimed in any one of the preceding claims.
According to the scheme, the distance between the initial position of the piston of the linear compressor in the cylinder and the top dead center is determined based on the stroke of the piston when the linear compressor operates under the preset working condition, and the time length of the linear compressor operating under the preset working condition is longer than that of the linear compressor operating under the maximum working condition; and when the working condition is not preset, the alternating current voltage and the direct current voltage are applied to the linear compressor, and the magnitude of the alternating current voltage and the magnitude and the direction of the direct current voltage are controlled, so that the actual stroke of the piston is equal to the target stroke when the piston reaches the top dead center, and the volumetric efficiency of the linear compressor is improved by using a smaller target stroke under the condition of not increasing the refrigerating capacity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of an implementation of controlling the magnitude of the ac voltage and the magnitude and direction of the dc voltage when the linear compressor operates in the non-predetermined operating condition, so that the actual stroke of the piston when the piston reaches the top dead center is equal to the target stroke of the operated non-predetermined operating condition according to the embodiment of the present invention;
FIG. 2 is a flowchart of an implementation of a linear compression control method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a control device of a linear compressor according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a second control module according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a control unit according to an embodiment of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be practiced otherwise than as specifically illustrated.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The embodiment of the invention discloses a linear compressor control method and a device, which are applied to an electric appliance with a linear compressor, wherein the distance between the initial position of a piston of the linear compressor in a cylinder and a top dead center is determined based on the stroke of the piston when the linear compressor operates under a preset working condition, and the time length of the linear compressor operating under the preset working condition is longer than the time length of the linear compressor operating under the maximum working condition; that is, during the operation of the electric appliance, the total length of time that the linear compressor is operated at the predetermined operating condition is greater than the total length of time that the linear compressor is operated at the maximum operating condition for a certain period of time.
In the embodiment of the invention, the upper dead center refers to the position of the cylinder head in the cylinder of the linear compressor, and the position is a fixed and absolute position and cannot be changed. The concept opposite to the top dead center is the bottom dead center, which is the farthest position of the piston moving away from the top dead center, and the position changes with the difference between the piston stroke and the center position, and the absolute position of the position can be changed.
The linear compressor generally has a plurality of working conditions, and under different working conditions, the target stroke of piston motion is different, and the larger the working condition is, the larger the target stroke of piston motion is, and the smaller the working condition is, the smaller the target stroke of piston is. In the embodiment of the invention, the preset working condition is not the maximum working condition. The distance between the initial position of the piston in the cylinder and the top dead center, which is determined based on the stroke of the piston when the linear compressor operates in the preset working condition, is smaller than the distance between the initial position of the piston in the cylinder and the top dead center, which is determined based on the stroke of the piston when the linear compressor operates in the maximum working condition.
An implementation manner of the control method of the linear compressor provided by the embodiment of the invention can be as follows:
when the linear compressor operates under a preset working condition, only applying alternating voltage to the linear compressor, and controlling the magnitude of the applied alternating voltage to enable the actual stroke of the piston to be equal to the target stroke under the preset working condition;
the distance between the initial position of the piston of the linear compressor and the top dead center is determined based on the stroke of the piston when the linear compressor operates under the preset working condition, namely, in the embodiment of the invention, if the linear compressor operates under the preset working condition, the motion stroke of the piston is equal to the target stroke under the preset working condition only by applying alternating voltage to the linear compressor. After the magnitude of the alternating voltage is determined, the stroke of the piston is determined.
When the linear compressor is switched from the non-preset working condition to the preset working condition, the direct-current voltage applied to the linear compressor is cut off, only the alternating-current voltage is applied to the linear compressor, and in the operation process of the preset working condition, the size of the alternating-current voltage can be controlled by detecting the relative relation between the position of the piston and the top dead center. If the position of the piston is lower than the top dead center, increasing the alternating voltage; if the position of the piston is higher than the upper dead point, reducing the alternating voltage; if the piston position is just at the top dead center (at this time, the stroke of the piston is equal to the target stroke of the piston under the preset working condition), the magnitude of the alternating voltage is kept unchanged.
When the linear compressor operates under the non-predetermined working condition, applying alternating current voltage and direct current voltage to the linear compressor, and controlling the magnitude of the alternating current voltage and the magnitude and direction of the direct current voltage to enable the actual stroke of the piston to be equal to the target stroke of the operated non-predetermined working condition when the piston reaches the top dead center.
In the embodiment of the invention, under any one non-preset working condition, the direct current voltages in different directions are applied to the linear compressor, so that the center position of the motion of the piston is deviated in different directions, the piston of the linear compressor reaches the top dead center by a small stroke, and the stroke when the piston reaches the top dead center is equal to the target stroke under the working condition.
According to the control method of the linear compressor, the distance between the initial position of the piston of the linear compressor in the cylinder and the top dead center is determined based on the stroke of the piston when the linear compressor operates under the preset working condition, and the time length of the linear compressor operating under the preset working condition is longer than the time length of the linear compressor operating under the maximum working condition; and when the working condition is not preset, the alternating current voltage and the direct current voltage are applied to the linear compressor, and the magnitude of the alternating current voltage and the magnitude and the direction of the direct current voltage are controlled, so that the actual stroke of the piston when the piston reaches the top dead center is equal to the target stroke under the working condition, and the volumetric efficiency of the linear compressor is improved by using a smaller target stroke under the condition of not increasing the refrigerating capacity.
In addition, the energy efficiency of the compressor is an important index of the compressor, and the energy efficiency COP of the linear compressor is as follows: cold quantity P output by linear compressoroPower consumption P of linear compressorinRatio of (1), i.e. COP ═ Po/Pin. Because the time length of the linear compressor when the linear compressor operates in the preset working condition is longer than the time length of the linear compressor when the linear compressor operates in the maximum working condition, namely, the embodiment of the invention only applies the direct-current voltage in the working condition with shorter operation time (namely, the non-preset working condition), the power consumption is less increased, the power consumption of the linear compressor is less increased, and the influence on the compression energy efficiency of the linear compressor is less.
Optionally, an implementation flowchart of the method for making an actual stroke of the piston equal to a target stroke of the linear compressor under the non-predetermined operating condition by controlling the magnitude of the ac voltage and the magnitude and the direction of the dc voltage when the linear compressor operates under the non-predetermined operating condition, as shown in fig. 1, may include:
step S11: when the piston reaches the top dead center by applying the alternating voltage to the linear compressor, the actual stroke of the piston is compared with the target stroke under the non-predetermined working condition.
In the embodiment of the invention, when the linear compressor operates under the non-predetermined working condition, the direct-current voltage may be applied to the linear compressor or not applied to the linear compressor. For example, if the first working condition is an unpredicted working condition, if the second working condition is another unpredicted working condition different from the first working condition, the direct-current voltage is always applied to the linear compressor after the linear compressor is switched from the second working condition to the first working condition, and the applied direct-current voltage is changed according to the target stroke of the first working condition; and if the second working condition is the preset working condition, the linear compressor is switched to the initial stage after the first working condition from the second working condition, the direct-current voltage is not applied to the linear compressor, and the direct-current voltage is increased according to the target stroke of the first working condition subsequently.
Step S12: and changing the magnitude of the alternating current voltage applied to the linear compressor according to the comparison result, and applying direct current voltage in a preset direction to the linear compressor until the actual stroke of the piston reaches the top dead center, wherein the actual stroke of the piston is the target stroke under the operating non-preset working condition.
And if the comparison result shows that the actual stroke of the piston is equal to the target stroke under the non-preset working condition, keeping the current alternating voltage and the direct voltage unchanged.
If the comparison result shows that the actual stroke of the piston is not equal to the target stroke under the non-predetermined working condition, the magnitude of the alternating-current voltage applied to the linear compressor is changed, the direct-current voltage in the preset direction is applied to the linear compressor, the magnitude of the applied direct-current voltage can be adjusted in a gradually increasing or reducing mode until the actual stroke of the piston reaches the top dead center and is the target stroke under the non-predetermined working condition of the current operation.
Optionally, an implementation manner that the magnitude of the ac voltage applied to the linear compressor is changed according to the comparison result, and the dc voltage in the preset direction is applied to the linear compressor until the actual stroke of the piston reaches the top dead center is the target stroke under the non-predetermined working condition provided by the embodiment of the present invention may be:
if the actual stroke of the piston is smaller than the target stroke of the operated non-preset working condition, applying direct current voltage in a first direction to the linear compressor to enable the motion center of the piston to deviate towards the direction far away from the top dead center, and increasing the alternating current voltage applied to the linear compressor until the piston reaches the top dead center, wherein the actual stroke of the piston is the target stroke of the operated non-preset working condition;
when the moving center of the piston deviates to the direction far away from the top dead center, the moving stroke of the piston is increased when the piston reaches the top dead center.
And if the actual stroke of the piston is larger than the target stroke of the piston under the non-preset working condition, reducing the alternating current voltage applied to the linear compressor, and applying the direct current voltage in the second direction to the linear compressor, so that the motion center of the piston deviates towards the direction close to the top dead center until the actual stroke of the piston reaches the target stroke of the piston under the non-preset working condition.
When the moving center of the piston shifts to a direction approaching the top dead center, the moving stroke of the piston is reduced when the piston reaches the top dead center.
In the embodiment of the invention, if the actual stroke of the piston is larger than the target stroke under the non-predetermined working condition, the alternating current voltage applied to the linear compressor is firstly reduced, and then the direct current voltage in the second direction is applied to the linear compressor, so that the phenomenon that the piston collides with the cylinder because the direct current voltage in the second direction is applied to the linear compressor is avoided.
Optionally, the time length of the linear compressor operating under the predetermined operating condition is longer than the time length of the linear compressor operating under any non-predetermined operating condition.
That is, in the embodiment of the present invention, the most common operating condition of the linear compressor is used as the predetermined operating condition, that is, the initial position of the piston of the linear compressor in the cylinder is determined according to the target stroke under the operating condition with the longest operation time.
Specifically, the distance from the initial position of the piston in the cylinder to the top dead center may be:
the linear compressor is operated under a preset working condition, and the difference between the target stroke of the piston movement and the preset offset corresponding to the preset working condition. Can be expressed by the formula:
d0l/2- δ, wherein,
d0represents the distance from the initial position of the piston in the cylinder to the top dead center; l represents a target stroke when the linear compressor operates in a preset working condition; and delta represents a preset offset corresponding to a preset working condition, wherein the offset is the offset of the center position of the piston movement under the action of gas force when the linear compressor makes free piston movement, and can be obtained by combining theoretical design with actual experience.
Referring to fig. 2, fig. 2 is a flowchart illustrating an implementation of a linear compression control method according to an embodiment of the present invention, which may include:
step S21: an alternating voltage is applied to the linear compressor, and the alternating voltage is gradually increased from small to large.
In the embodiment of the invention, only the alternating current voltage is applied to the linear compressor at the initial stage of starting the linear compressor.
Step S22: judging whether the piston reaches a top dead center or not; if yes, go to step S23, otherwise go to step S29;
step S23: detecting the actual stroke of the piston;
step S24: judging whether the actual stroke of the piston is equal to the target stroke under the operating condition; if yes, go to step S25, otherwise go to step S26;
if the actual stroke of the piston is equal to the target stroke under the operating condition, the linear compressor is indicated to be operated under the preset operating condition, otherwise, the linear compressor is indicated to be operated under the non-preset operating condition.
Step S25: the process returns to step S22 while maintaining the magnitude of the ac voltage.
It can be seen that when the linear compressor is operated at a predetermined operating condition, the direct current voltage is not applied to the linear compressor.
Step S26: judging whether the actual stroke of the piston is smaller than the target stroke under the operating condition, if so, executing step S27, otherwise, executing step S28;
step S27: applying reverse direct current voltage to enable the center of the piston to move in the direction away from the top dead center and increase the alternating current voltage; return to perform step S22;
step S28: reducing the alternating voltage and applying a positive direct voltage to enable the center of the piston to move towards the direction close to the top dead center; return to perform step S22;
the direct current voltage is applied to the linear compressor only when the linear compressor is operated under the non-predetermined operating condition.
In the embodiment of the invention, the direct current voltage which enables the center of the piston to move towards the direction far away from the top dead center is defined as the reverse direct current voltage, and the direct current voltage which enables the center of the piston to move towards the direction close to the top dead center is defined as the forward direct current voltage.
Step S29: judging whether the position of the piston is lower than a top dead center, if so, executing step S210, and if not, executing step S211;
step S210: the ac voltage is increased, and the process returns to step S22.
Step S211: the ac voltage is reduced, and the process returns to step S22.
Corresponding to the method embodiment, an embodiment of the present invention further provides a linear compressor control device, and a schematic structural diagram of the linear compressor control device according to the embodiment of the present invention is shown in fig. 3, and the linear compressor control device may include:
a first control module 31 and a second control module 32; wherein,
the first control module 31 is configured to apply an ac voltage to the linear compressor only when the linear compressor is operating under a predetermined operating condition, and control the magnitude of the applied ac voltage to make the actual stroke of the piston equal to the target stroke under the predetermined operating condition;
the distance between the initial position of the piston of the linear compressor and the top dead center is determined based on the stroke of the piston when the linear compressor operates under the preset working condition, namely, in the embodiment of the invention, if the linear compressor operates under the preset working condition, the motion stroke of the piston is equal to the target stroke under the preset working condition only by applying alternating voltage to the linear compressor. After the magnitude of the alternating voltage is determined, the stroke of the piston is determined.
When the linear compressor is switched from the non-preset working condition to the preset working condition, the direct-current voltage applied to the linear compressor is cut off, only the alternating-current voltage is applied to the linear compressor, and in the operation process of the preset working condition, the size of the alternating-current voltage can be controlled by detecting the relative relation between the position of the piston and the top dead center. If the position of the piston is lower than the top dead center, increasing the alternating voltage; if the position of the piston is higher than the upper dead point, reducing the alternating voltage; if the piston position is just at the top dead center (at this time, the stroke of the piston is equal to the target stroke of the piston under the preset working condition), the magnitude of the alternating voltage is kept unchanged.
The second control module 32 is configured to apply an ac voltage and a dc voltage to the linear compressor when the linear compressor is operated under the non-predetermined operating condition, and control the magnitude of the ac voltage and the magnitude and direction of the dc voltage to make the actual stroke of the piston equal to the target stroke of the piston when the piston reaches the top dead center under the non-predetermined operating condition.
In the embodiment of the invention, under any one non-preset working condition, the direct current voltages in different directions are applied to the linear compressor, so that the center position of the motion of the piston is deviated in different directions, the piston of the linear compressor reaches the top dead center by a small stroke, and the stroke when the piston reaches the top dead center is equal to the target stroke under the working condition.
According to the control device of the linear compressor provided by the embodiment of the invention, the distance between the initial position of the piston of the linear compressor in the cylinder and the top dead center is determined based on the stroke of the piston when the linear compressor operates under the preset working condition, and the time length of the linear compressor operating under the preset working condition is longer than the time length of the linear compressor operating under the maximum working condition; and when the working condition is not preset, the alternating current voltage and the direct current voltage are applied to the linear compressor, and the magnitude of the alternating current voltage and the magnitude and the direction of the direct current voltage are controlled, so that the actual stroke of the piston when the piston reaches the top dead center is equal to the target stroke under the working condition, and the volumetric efficiency of the linear compressor is improved by using a smaller target stroke under the condition of not increasing the refrigerating capacity.
In addition, the energy efficiency of the compressor is an important index of the compressor, and the energy efficiency COP of the linear compressor is as follows: cold quantity P output by linear compressoroPower consumption P of linear compressorinRatio of (1), i.e. COP ═ Po/Pin. Because the time length of the linear compressor when the linear compressor operates in the preset working condition is longer than the time length of the linear compressor when the linear compressor operates in the maximum working condition, namely, the embodiment of the invention only applies the direct-current voltage in the working condition with shorter operation time (namely, the non-preset working condition), the power consumption is less increased, the power consumption of the linear compressor is less increased, and the influence on the compression energy efficiency of the linear compressor is less.
Optionally, a schematic structural diagram of the second control module 32 provided in the embodiment of the present invention is shown in fig. 4, and may include:
a comparing unit 41 and a control unit 42; wherein,
the comparison unit 41 is used for comparing the actual stroke of the piston with the target stroke under the non-preset working condition when the piston reaches the top dead center by applying the alternating voltage to the linear compressor;
in the embodiment of the invention, when the linear compressor operates under the non-predetermined working condition, the direct-current voltage may be applied to the linear compressor or not applied to the linear compressor. For example, if the first working condition is an unpredicted working condition, if the second working condition is another unpredicted working condition different from the first working condition, the direct-current voltage is always applied to the linear compressor after the linear compressor is switched from the second working condition to the first working condition, and the applied direct-current voltage is changed according to the target stroke of the first working condition; and if the second working condition is the preset working condition, the linear compressor is switched to the initial stage after the first working condition from the second working condition, the direct-current voltage is not applied to the linear compressor, and the direct-current voltage is increased according to the target stroke of the first working condition subsequently.
The control unit 42 is configured to change the magnitude of the ac voltage applied to the linear compressor according to the comparison result, and apply a dc voltage in a preset direction to the linear compressor until the actual stroke of the piston reaches the top dead center, which is a target stroke of the piston under the non-predetermined operating condition.
If the comparison result shows that the actual stroke of the piston is equal to the target stroke under the non-predetermined operating condition, the control unit 42 keeps the current magnitude of the ac voltage and the magnitude and direction of the dc voltage unchanged.
If the comparison result shows that the actual stroke of the piston is not equal to the target stroke under the non-predetermined operating condition, the control unit 42 changes the magnitude of the ac voltage applied to the linear compressor, and applies a dc voltage in a preset direction to the linear compressor, and the magnitude of the applied dc voltage can be adjusted in a gradual increasing or decreasing manner until the actual stroke of the piston reaches the top dead center, which is the target stroke under the non-predetermined operating condition of the current operation.
Optionally, a schematic structural diagram of the control unit 42 provided in the embodiment of the present invention is shown in fig. 5, and may include:
a first control subunit 51 and a second control subunit 52; wherein,
the first control subunit 51 is configured to apply a dc voltage in a first direction to the linear compressor if the actual stroke of the piston is smaller than the target stroke of the operating non-predetermined operating condition, so that the center of motion of the piston is shifted away from the top dead center, and increase the ac voltage applied to the linear compressor until the actual stroke of the piston reaches the top dead center, where the target stroke is the actual stroke;
when the moving center of the piston deviates to the direction far away from the top dead center, the moving stroke of the piston is increased when the piston reaches the top dead center.
The second control subunit 52 is configured to reduce the ac voltage applied to the linear compressor if the actual stroke of the piston is greater than the target stroke of the operated non-predetermined operating condition, and apply the dc voltage in the second direction to the linear compressor, so that the center of motion of the piston is shifted toward the top dead center until the actual stroke of the piston reaches the target stroke of the operated non-predetermined operating condition.
When the moving center of the piston shifts to a direction approaching the top dead center, the moving stroke of the piston is reduced when the piston reaches the top dead center.
Optionally, the time length of the linear compressor operating under the predetermined operating condition is longer than the time length of the linear compressor operating under any non-predetermined operating condition.
That is, in the embodiment of the present invention, the most common operating condition of the linear compressor is used as the predetermined operating condition, that is, the initial position of the piston of the linear compressor in the cylinder is determined according to the target stroke under the operating condition with the longest operation time.
Specifically, the distance from the initial position of the piston in the cylinder to the top dead center may be:
the linear compressor is operated under a preset working condition, and the difference between the target stroke of the piston movement and the preset offset corresponding to the preset working condition. Can be expressed by the formula:
d0l/2- δ, wherein,
d0represents the distance from the initial position of the piston in the cylinder to the top dead center; l represents a target stroke when the linear compressor operates in a preset working condition; and delta represents a preset offset corresponding to a preset working condition, wherein the offset is the offset of the center position of the piston movement under the action of gas force when the linear compressor makes free piston movement, and can be obtained by combining theoretical design with actual experience.
Optionally, an embodiment of the present invention further provides a linear compressor, including a cylinder and a piston disposed in the cylinder, where a distance from an initial position of the piston in the cylinder to a top dead center is determined based on a target stroke of the linear compressor when the linear compressor operates in a predetermined operating condition; the time length of the linear compressor when the linear compressor operates in the preset working condition is longer than the time length of the linear compressor when the linear compressor operates in the maximum working condition.
That is, during the operation of the electric appliance in which the linear compressor is located, the total length of time that the linear compressor is operated under the predetermined operating condition is greater than the total length of time that the linear compressor is operated under the maximum operating condition within a certain period of time.
In the embodiment of the invention, the upper dead center refers to the position of the cylinder head in the cylinder of the linear compressor, and the position is a fixed and absolute position and cannot be changed. The concept opposite to the top dead center is the bottom dead center, which is the farthest position of the piston moving away from the top dead center, and the position changes with the difference between the piston stroke and the center position, and the absolute position of the position can be changed.
The linear compressor generally has a plurality of working conditions, and under different working conditions, the target stroke of piston motion is different, and the larger the working condition is, the larger the target stroke of piston motion is, and the smaller the working condition is, the smaller the target stroke of piston is. In the embodiment of the invention, the preset working condition is not the maximum working condition. The distance between the initial position of the piston in the cylinder and the top dead center, which is determined based on the stroke of the piston when the linear compressor operates in the preset working condition, is smaller than the distance between the initial position of the piston in the cylinder and the top dead center, which is determined based on the stroke of the piston when the linear compressor operates in the maximum working condition.
Optionally, the time length of the linear compressor operating under the predetermined operating condition is longer than the time length of the linear compressor operating under any non-predetermined operating condition.
That is, in the embodiment of the present invention, the most common operating condition of the linear compressor is used as the predetermined operating condition, that is, the initial position of the piston of the linear compressor in the cylinder is determined according to the target stroke under the operating condition with the longest operation time.
Specifically, the distance from the initial position of the piston in the cylinder to the top dead center may be:
the linear compressor is operated under a preset working condition, and the difference between the target stroke of the piston movement and the preset offset corresponding to the preset working condition. Can be expressed by the formula:
d0l/2- δ, wherein,
d0represents the distance from the initial position of the piston in the cylinder to the top dead center; l represents a target stroke when the linear compressor operates in a preset working condition; and delta represents a preset offset corresponding to a preset working condition, wherein the offset is the offset of the center position of the piston movement under the action of gas force when the linear compressor makes free piston movement, and can be obtained by combining theoretical design with actual experience.
Optionally, an embodiment of the present invention further provides an electric appliance, where the electric appliance includes the linear compressor as described above and the linear compressor control device as described above.
The electric appliance may be a refrigerator, or an electric appliance using a linear compressor such as an air conditioner.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. A linear compressor control method is applied to an electric appliance and is characterized in that the distance between the initial position of a piston of a linear compressor in a cylinder and a top dead center is determined based on the target stroke of the piston when the linear compressor operates in a preset working condition, and the time length of the linear compressor when the linear compressor operates in the preset working condition is longer than the time length of the linear compressor when the linear compressor operates in the maximum working condition; the preset working condition is a non-maximum working condition; the method comprises the following steps:
when the linear compressor operates under the preset working condition, only applying alternating voltage to the linear compressor, and controlling the magnitude of the applied alternating voltage to enable the actual stroke of the piston to be equal to the target stroke under the preset working condition;
when the linear compressor operates under a non-preset working condition, applying alternating current voltage and direct current voltage to the linear compressor, and controlling the magnitude of the alternating current voltage and the magnitude and direction of the direct current voltage to enable the actual stroke of the piston to be equal to the target stroke under the non-preset working condition when the piston reaches the top dead center.
2. The method of claim 1, wherein when the linear compressor is operated under an unexpected operating condition, the making the actual stroke of the piston equal to the target stroke under the unexpected operating condition when the piston reaches the top dead center by controlling the magnitude of the alternating voltage and the magnitude and direction of the direct voltage comprises:
when the piston reaches the top dead center by applying alternating voltage to the linear compressor, comparing the actual stroke of the piston with the target stroke under the non-preset working condition;
and changing the magnitude of the alternating current voltage applied to the linear compressor according to the comparison result, and applying direct current voltage in a preset direction to the linear compressor until the actual stroke of the piston reaches the top dead center, wherein the actual stroke of the piston is the target stroke under the non-preset working condition.
3. The method of claim 2, wherein the changing the magnitude of the ac voltage applied to the linear compressor according to the comparison result and applying the dc voltage in the preset direction to the linear compressor until the actual stroke of the piston reaches the target stroke under the non-predetermined condition comprises:
if the actual stroke of the piston is smaller than the target stroke under the non-preset working condition, applying direct current voltage in a first direction to the linear compressor to enable the motion center of the piston to deviate towards the direction far away from the top dead center, and increasing the alternating current voltage applied to the linear compressor until the piston reaches the top dead center, wherein the actual stroke of the piston is the target stroke under the non-preset working condition;
if the actual stroke of the piston is larger than the target stroke under the non-preset working condition, reducing the alternating current voltage applied to the linear compressor, and applying direct current voltage in a second direction to the linear compressor, so that the motion center of the piston deviates towards the direction close to the top dead center until the actual stroke of the piston reaches the target stroke under the non-preset working condition.
4. A method according to any one of claims 1 to 3, wherein the linear compressor is operated at the predetermined operating condition for a period of time greater than the period of time for which the linear compressor is operated at any one of the non-predetermined operating conditions.
5. A linear compressor control device is applied to an electric appliance, and is characterized in that the distance between the initial position of a piston of a linear compressor in a cylinder and a top dead center is determined based on the target stroke of the linear compressor when the linear compressor operates in a preset working condition, and the time length of the linear compressor when the linear compressor operates in the preset working condition is longer than the time length of the linear compressor when the linear compressor operates in the maximum working condition; the preset working condition is a non-maximum working condition; the device comprises:
the first control module is used for applying alternating voltage to the linear compressor only when the linear compressor operates under the preset working condition, and the actual stroke of the piston is equal to the target stroke under the preset working condition by controlling the magnitude of the applied alternating voltage;
and the second control module is used for applying alternating current voltage and direct current voltage to the linear compressor when the linear compressor operates under a non-preset working condition, and controlling the magnitude of the alternating current voltage and the magnitude and direction of the direct current voltage to enable the actual stroke of the piston to be equal to the target stroke under the non-preset working condition when the piston reaches the top dead center.
6. The apparatus of claim 5, wherein the second control module comprises:
the comparison unit is used for comparing the actual stroke of the piston with the target stroke under the non-preset working condition when the piston reaches the top dead center by applying alternating voltage to the linear compressor;
and the control unit is used for changing the magnitude of the alternating-current voltage applied to the linear compressor according to the comparison result and applying direct-current voltage in a preset direction to the linear compressor until the actual stroke of the piston reaches the top dead center, wherein the actual stroke of the piston is the target stroke under the non-preset working condition.
7. The apparatus of claim 6, wherein the control unit comprises:
the first control subunit is used for applying a direct current voltage in a first direction to the linear compressor if the actual stroke of the piston is smaller than the target stroke under the non-preset working condition, so that the motion center of the piston deviates to the direction far away from the top dead center, and increasing the alternating current voltage applied to the linear compressor until the actual stroke of the piston reaches the target stroke when the piston reaches the top dead center;
and the second control subunit is used for reducing the alternating-current voltage applied to the linear compressor and applying a direct-current voltage in a second direction to the linear compressor if the actual stroke of the piston is greater than the target stroke under the non-preset working condition, so that the motion center of the piston deviates towards the direction close to the top dead center until the actual stroke of the piston reaches the target stroke under the non-preset working condition.
8. The apparatus of any one of claims 5 to 7, wherein the linear compressor is operated at the predetermined operating condition for a period of time greater than the period of time during which the linear compressor is operated at any one of the non-predetermined operating conditions.
9. A linear compressor comprising a cylinder and a piston disposed in the cylinder, characterized by further comprising the linear compressor control method of claim 1, wherein a distance from an initial position of the piston in the cylinder to a top dead center is determined based on a target stroke of the linear compressor when operating in a predetermined operating condition; the time length of the linear compressor running under the preset working condition is longer than the time length of the linear compressor running under the maximum working condition; wherein the predetermined operating condition is a non-maximum operating condition.
10. The linear compressor of claim 9, wherein the linear compressor operates in the predetermined operating condition for a period of time greater than a period of time during which the linear compressor operates in any one of the non-predetermined operating conditions.
11. Linear compressor according to claim 9 or 10, characterized in that the initial position of the piston in the cylinder is at a distance from the top dead centre:
and the linear compressor operates at half of the target stroke of the piston movement under the preset working condition, and the difference of the preset offset corresponding to the preset working condition.
12. An electrical appliance comprising a linear compressor as claimed in any one of claims 9 to 11 and a linear compressor control means as claimed in any one of claims 5 to 8.
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| CN107061249B (en) * | 2017-03-24 | 2020-07-07 | 青岛海尔智能技术研发有限公司 | Adjustment method of cylinder volume of linear compressor based on top dead center control |
| CN107218206B (en) * | 2017-06-30 | 2019-01-18 | 青岛海尔智能技术研发有限公司 | The control method of linear compressor cylinder capacity |
| CN109307400B (en) * | 2017-07-28 | 2020-11-20 | 合肥美的电冰箱有限公司 | Refrigerator refrigerating capacity control method and device and refrigerator |
| CN109307399A (en) * | 2017-07-28 | 2019-02-05 | 合肥美的电冰箱有限公司 | Refrigeration for refrigerator amount control method, device and refrigerator |
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