阅读说明：本技术 用于控制直流线性压缩机的方法及装置、直流线性压缩机 (Method and device for controlling a DC linear compressor, DC linear compressor ) 是由 许升 俞国新 陈庆 虞朝丰 陈晟 李来福 吴远刚 袁栋 杨景刚 宋洪强 高山 于 2019-10-31 设计创作，主要内容包括：本申请涉及一种用于控制直流线性压缩机的方法,其中,压缩机包括：设置有线圈的定子,以及设置有永磁体的动子,动子与压缩机的吸气端通过吸气弹簧连接,线圈通过开关管电路接电,用于控制直流线性压缩机的方法包括：检测线圈的反电动势；当反电动势达到预设值时,接通开关管电路,在达到第一时长后断开开关管电路。通过检测线圈的反电动势,在反电动势达到预设值时,接通开关管电路,使动子的永磁体收到定子的线圈的吸引,动子向排气端移动压缩制冷剂,在达到第一时长后断开开关管电路,使动子被吸气弹簧拉回至吸气端,简化了控制流程,节省了电能,增加了压缩机的可靠性。本申请还涉及用于控制直流线性压缩机的装置。(The present application relates to a method for controlling a direct current linear compressor, wherein the compressor comprises: the method for controlling the direct current linear compressor comprises a stator provided with a coil and a rotor provided with a permanent magnet, wherein the rotor is connected with an air suction end of the compressor through an air suction spring, the coil is connected with the power through a switch tube circuit, and the method for controlling the direct current linear compressor comprises the following steps: detecting the back electromotive force of the coil; and when the counter electromotive force reaches a preset value, switching on the switching tube circuit, and switching off the switching tube circuit after the first time length is reached. The switch tube circuit is switched on when the counter electromotive force reaches a preset value through the counter electromotive force of the detection coil, so that the permanent magnet of the rotor is attracted by the coil of the stator, the rotor moves to the exhaust end to compress a refrigerant, and the switch tube circuit is switched off after the first time, so that the rotor is pulled back to the suction end by the suction spring, the control flow is simplified, the electric energy is saved, and the reliability of the compressor is improved. The present application also relates to an apparatus for controlling a dc linear compressor.)

1. A method for controlling a dc linear compressor, the compressor comprising: the air compressor comprises a stator provided with a coil and a rotor provided with a permanent magnet, wherein the rotor is connected with an air suction end of the compressor through an air suction spring, and the coil is connected with direct current through a switching tube circuit, and the air compressor is characterized in that the method comprises the following steps:

detecting the back electromotive force of the coil;

when the counter electromotive force reaches a preset value, the switch tube circuit is switched on to enable the mover to be attracted by the magnetic field to move towards the exhaust end to compress the refrigerant, and the switch tube circuit is switched off after the first time length is reached to enable the mover to be pulled back to the suction end by the suction spring.

2. The method of claim 1, wherein the first duration is associated with a negative-going rate of change setting of the back-emf.

3. The method of claim 1, wherein the first duration ranges from 1ms to 11 ms.

4. The method of claim 1, wherein the direct current has a value in the range of 300V to 350V.

5. The method according to any one of claims 1 to 4, wherein the preset value is in the range of 1mV to 100 mV.

6. An apparatus for controlling a dc linear compressor, the apparatus comprising a processor and a memory having stored thereon program instructions, wherein the processor is configured to perform the method of any one of claims 1 to 5 when executing the program instructions.

7. A direct current linear compressor, comprising:

a stator provided with a coil, and an accommodation chamber;

the rotor is coaxially arranged with the stator and is provided with a permanent magnet;

one end of the rotor is connected with the air suction end of the direct current linear compressor through an air suction spring, and the other end of the rotor extends into the accommodating cavity of the stator.

8. The dc linear compressor of claim 7, wherein the stator is cylindrical and has a sidewall provided with stator slots, the coils being embedded in the stator slots.

9. The direct current linear compressor of claim 7, wherein the permanent magnet is disposed at an inner sidewall of the mover.

10. The direct current linear compressor according to claim 7, further comprising means for controlling a direct current linear compressor according to claim 6.

Technical Field

The present application relates to the field of linear compressors, and in particular to a method and a device for controlling a dc linear compressor.

Background

A compressor is used to compress and refrigerate a refrigerant in a refrigerating process of a home air conditioner or a refrigerator. Most of the current compressors are scroll compressors, rotor compressors or linear compressors. In a refrigeration appliance using a linear compressor, compression is required to perform work on a refrigerant when the compressor compresses the refrigerant. Then, work is required to be done in the air suction process to ensure that the mover of the compressor can normally move back and forth. In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art: when the mover of the compressor is controlled to move back and forth, work needs to be done in the air suction process, the work belongs to useless work, the control difficulty is increased, and extra electric energy needs to be wasted.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a method and a device for controlling a direct current linear compressor and the direct current linear compressor, so as to solve the technical problems that when a mover of the compressor is controlled to move back and forth, the suction process also applies work, the control difficulty is increased, and electric energy is wasted.

In some embodiments, a direct current linear compressor includes: the method for controlling the direct current linear compressor comprises a stator provided with a coil and a rotor provided with a permanent magnet, wherein the rotor is connected with a suction end of the compressor through a suction spring, the coil is connected with direct current through a switching tube circuit, and the method for controlling the direct current linear compressor comprises the following steps: detecting the back electromotive force of the coil; when the counter electromotive force reaches a preset value, the switch tube circuit is switched on to enable the mover to be attracted by the magnetic field to move towards the exhaust end to compress the refrigerant, and the switch tube circuit is switched off after the first time length is reached to enable the mover to be pulled back to the suction end by the suction spring.

In some embodiments, a direct current linear compressor includes: a stator provided with a coil, and an accommodation chamber; the rotor is coaxially arranged with the stator and is provided with a permanent magnet; one end of the rotor is connected with the air suction end of the direct current linear compressor through an air suction spring, and the other end of the rotor extends into the accommodating cavity of the stator.

In some embodiments, an apparatus for controlling a dc linear compressor includes a processor and a memory storing program instructions, the processor configured to, when executing the program instructions, perform a method as provided by an embodiment.

The method and the device for controlling the direct current linear compressor and the direct current linear compressor provided by the embodiment of the disclosure can realize the following technical effects: and when the counter electromotive force reaches a preset value, the switch tube circuit is switched on, so that the permanent magnet of the rotor is attracted by the coil of the stator, the rotor moves towards the exhaust end to compress the refrigerant, and the switch tube circuit is switched off after the first time, so that the rotor is pulled back to the suction end by the suction spring. The rotor is automatically pulled to one end of the air suction by the air suction spring to complete the whole air suction and compression process, so that the control flow is simplified, the electric energy is saved, and meanwhile, the reliability of the compressor is improved due to the reduction of the air suction control process.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

FIG. 1 is a schematic flow chart diagram for controlling a DC linear compressor provided by an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a dc linear compressor provided in an embodiment of the present disclosure;

FIG. 3 is a graph of the trend of back EMF over time;

fig. 4 is a block diagram illustrating a structure of an apparatus for controlling a dc linear compressor according to an embodiment of the present disclosure.

Reference numerals:

1. a housing; 2. a stator; 20. a coil; 3. a mover; 30. a permanent magnet; 4. an intake spring; 5. a piston; 6. an exhaust valve plate; 7. a cylinder; 100. a processor; 101. a memory; 102. a communication interface; 103. a bus.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The disclosed embodiments provide a method for controlling a direct current linear compressor, the compressor including: the rotor is connected with the air suction end of the compressor through an air suction spring, and the coil is connected with direct current through a switch tube circuit. As shown in fig. 1, the method for controlling a direct current linear compressor includes:

s201, detecting the back electromotive force of the coil;

s202, when the counter electromotive force reaches a preset value, the switching tube circuit is switched on to enable the mover to be attracted by the magnetic field to move towards the exhaust end to compress the refrigerant, and after the first time period is reached, the switching tube circuit is switched off to enable the mover to be pulled back to the suction end by the suction spring.

The stator is provided with a coil, the rotor is provided with a permanent magnet, when current is introduced to the coil, the rotor and the stator attract each other due to the action of a magnetic field, and the rotor moves towards the direction of the stator; when the current is cut off, the action between the rotor and the stator disappears, and the air suction spring pulls the rotor back to the air suction end. Alternating the on and off current enables the mover to move linearly between the suction and discharge ends of the compressor. In the process of linear motion of the mover, the coil cuts a magnetic field generated by the permanent magnet, so that counter electromotive force is generated, and the value of the counter electromotive force changes along with the change of the position of the mover. When the mover is in a stationary state, the value of the counter electromotive force is zero. The mover reciprocates between the suction end and the discharge end, stops moving when moving to a position closest to the suction end, and has zero back electromotive force when moving to a position closest to the discharge end. The back electromotive force can be collected by adopting a loop through the zero crossing of controller hardware. The level change of the back electromotive force is monitored according to the zero-crossing loop, and the position where the mover moves furthest from the balance position can be monitored.

During the movement of the mover, the suction spring has three states: natural state, stretch or shrink. And the rotor is in a balance position when the air suction spring is in a natural state. When the compressor is not started, current is not introduced into the coil, the suction spring is in a natural state and does not stretch or contract, and the rotor is static and does not move. And then after the compressor is started, firstly introducing current into the coil, wherein the introduction time period can be a second time period, so that the rotor moves towards the exhaust end, the suction spring is stretched, then the current is cut off, the rotor moves towards the suction end, when the suction spring is restored to a natural state, the rotor passes through a balance position, the movement speed of the rotor is the maximum, the back electromotive force is also the maximum, then the rotor continuously approaches to the suction end, and the suction spring contracts. When the rotor moves to the air suction end, the speed of the rotor is reduced to zero. And when the rotor is close to the air suction end and the speed is not reduced to zero, selecting a value of back electromotive force at one position as a preset value. When the counter electromotive force of the rotor is detected to reach a preset value, a switch tube circuit of the coil is switched on, the coil is electrified to attract the rotor, the speed of the rotor is reduced to zero in advance, and therefore excessive compression of the rotor on the air suction spring can be avoided, the air suction spring is prevented from deforming and losing efficacy after the rotor excessively compresses the air suction spring frequently, the rotor is prevented from colliding to a fixing plate of the air suction end, and the stability of reciprocating motion of the rotor is improved. After the speed of the rotor is reduced to zero, the rotor is attracted by the stator and moves towards the exhaust end, and the rotor drives the piston to compress the refrigerant to do work. Optionally, the second duration is 1 ms. Therefore, the rotor can move towards the air suction end for a certain distance in advance, so that the air suction spring is stretched, and the whole process is excited.

After the switch current is switched on for the first time, the rotor reaches a position close to the exhaust end, at the moment, the current is switched off, and the air suction spring pulls the rotor back to the air suction end. Therefore, the exhaust valve plate of the exhaust end can be prevented from being impacted by the mover by limiting the length of the first time length, so that the exhaust valve plate is prevented from being damaged due to frequent impact of the mover, and the noise of a compressor generated by impacting the exhaust valve plate is eliminated.

In some embodiments, the first time period is associated with a negative rate of change setting of back emf. When the compressor works, the mover drives the piston to move in the cylinder to compress a refrigerant, and when the mover has a smaller stroke and does not reach an exhaust valve plate impacting an exhaust end, the slope of a generated counter electromotive force curve is basically unchanged. When the stroke is large, the mover can impact the exhaust valve plate, the speed of the mover can be suddenly reduced in the impact process, the negative change rate is increased rapidly, and the first time length is obtained according to the set value of the negative change rate. Or a back electromotive force graph is made, as shown in fig. 3, a point indicated at a in the graph is an inflection point of the back electromotive force. The first time length is determined according to the inflection point position of the back electromotive force. When the on-state current reaches the first time, the current is cut off, and the air discharge valve plate can be prevented from being impacted by the rotor.

Thereby preventing continuous impact on the discharge valve sheet. On the one hand, the risk that the compressor is damaged due to the fact that the piston continuously impacts the exhaust valve plate is avoided, and reliability is improved. On the other hand, the noise of the compressor generated by the continuous impact of the piston on the exhaust valve plate is avoided, and the sound quality of the compressor is improved.

Optionally, the first duration ranges from 1ms to 11 ms. In this scope, can avoid the piston to last striking discharge valve piece and lead to the risk of compressor damage.

In some embodiments, the direct current has a value in the range of 300V to 350V. Optionally, the value range of the direct current is 310V. Alternating current is converted into direct current of 300-350V, and then the on-off of the direct current is controlled to realize the control of the reciprocating motion of the rotor, the rotor and the piston are automatically pulled to one end of air suction by virtue of the air suction spring only to apply work in the process that the compressor compresses a refrigerant and not to apply work in the air suction process, so that the whole air suction compression process is completed, and the reliability of the compressor is also improved. When the direct current is 310V, the running frequency of the compressor is more suitable.

In some embodiments, the predetermined value ranges from 1mV to 100 mV. In this range, the switching tube circuit is energized before the mover excessively compresses the suction spring, the coil of the stator and the permanent magnet of the mover attract each other, the mover rapidly drops to zero speed and moves toward the exhaust end, the suction spring is protected, and the mover is prevented from striking the fixing plate of the suction end. Optionally, the preset value ranges from 5mV to 10 mV. Therefore, the on-time of the switching tube circuit can be accurately controlled.

As shown in fig. 2, an embodiment of the present disclosure also provides a direct current linear compressor, including: a stator 2 provided with a coil 20, and a housing chamber; a mover 3 coaxially disposed with the stator 2 and provided with a permanent magnet 30; one end of the mover 3 is connected with the air suction end of the direct current linear compressor through an air suction spring 4, and the other end of the mover extends into the accommodating cavity of the stator 2.

The mover 3 and the stator 2 are disposed in the casing 1 of the compressor and are coaxially disposed. When the compressor works, the rotor 3 drives the piston 5 to move in the cylinder 7 to compress a refrigerant, when the coil 20 is connected with current, the permanent magnet 30 of the rotor 3 interacts with the coil 20 of the stator 2, the rotor 3 is attracted by magnetic force to move to the exhaust end, the air suction spring 4 is stretched, when the rotor 3 moves to the exhaust end, the rotor extends into the accommodating cavity of the stator 2, and the piston 5 arranged in the rotor 3 compresses the refrigerant; when the coil 20 is de-energized, the suction spring 4 contracts and pulls the mover 3 back to the suction end. Thus, the mover 3 can be prevented from colliding against the exhaust valve sheet 6 at the exhaust end, thereby preventing the exhaust valve sheet 6 from being damaged due to frequent collision of the mover 3 and also eliminating the noise of the compressor generated by the collision of the exhaust valve sheet 6.

Alternatively, the stator 2 is cylindrical, and the side walls are provided with stator slots, around which the coils 20 are embedded. The coil 20 is embedded in the stator slot and can be kept stable, the permanent magnet 30 generates a magnetic field, and the mover 3 reciprocates to cut the magnetic induction lines, thereby generating a counter electromotive force. Alternatively, the permanent magnets 30 are disposed at inner sidewalls of the mover 3. The permanent magnets 30 are positioned closer to the coils 20 of the stator 2 on the inner sidewall of the mover 3, and thus can enhance the interaction with the coils 20. The air suction spring 4 needs to be a spring with a high elastic coefficient, and can bear frequent compression of the mover 3, so that damage is avoided.

In some embodiments, the dc linear compressor further comprises means for controlling the dc linear compressor, the means comprising a processor and a memory storing program instructions, the processor being configured to perform the method for controlling the dc linear compressor provided by any of the preceding embodiments when executing the program instructions.

The disclosed embodiments also provide an apparatus for controlling a dc linear compressor, comprising a processor and a memory storing program instructions, the processor being configured to execute the method for controlling a dc linear compressor as provided in any one of the preceding embodiments when executing the program instructions.

The device executes the method for controlling the direct current linear compressor provided by any one of the embodiments, and controls the connection and disconnection of the switching tube circuit, so that the linear reciprocating motion of the rotor is realized on the direct current compressor, the power is only applied in the process of compressing the refrigerant, the power is not applied in the air suction process, the piston of the rotor is automatically pulled to one end of the air suction by a spring, the whole air suction compression process is completed, the control flow is simplified, the electric energy is saved, and meanwhile, the reliability of the compressor is improved due to the reduction of the air suction control process.

The structure of the apparatus for controlling the dc linear compressor is shown in fig. 3, and includes: at least one processor (processor)100, one processor 100 being exemplified in fig. 3; and a memory (memory)101, and may further include a Communication Interface (Communication Interface)102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other via a bus 103. The communication interface 102 may be used for information transfer. The processor 100 may call logic instructions in the memory 101 to perform the method for controlling the dc linear compressor of the above-described embodiment.

In addition, the logic instructions in the memory 101 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.

The memory 101, which is a computer-readable storage medium, may be used for storing software programs, computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 100 executes functional applications and data processing, i.e., implements the method for controlling the dc linear compressor in the above-described method embodiments, by executing software programs, instructions, and modules stored in the memory 101.

The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. In addition, the memory 101 may include a high-speed random access memory, and may also include a nonvolatile memory.

Embodiments of the present disclosure provide a computer-readable storage medium storing computer-executable instructions configured to perform the above-described method for controlling a direct current linear compressor.

The disclosed embodiments provide a computer program product comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the above-described method for controlling a dc linear compressor.

The computer-readable storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.

The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes one or more instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.

The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the disclosed embodiments includes the full ambit of the claims, as well as all available equivalents of the claims. As used in this application, although the terms "first," "second," etc. may be used in this application to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, unless the meaning of the description changes, so long as all occurrences of the "first element" are renamed consistently and all occurrences of the "second element" are renamed consistently. The first and second elements are both elements, but may not be the same element. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosures, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.

Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

The terms "inner", "outer", and the like, herein indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description herein, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, and indirect connections via intermediary media, where the specific meaning of the terms is understood by those skilled in the art as appropriate.