CN110686435A - Control method and control device for heating belt of fixed-frequency compressor - Google Patents

Abstract

The invention discloses a control method and a control device for a heating belt of a fixed-frequency compressor, and belongs to the field of compressors. The control method includes determining the state of the compressor; when the compressor is not started to work, obtaining the external ambient temperature Tao; when Tao>T0, controlling the heating belt to be off; when Tao is less than or equal to T0, obtaining the exhaust temperature Td and T0 Coil temperature Tc; when Td≤Tc+5℃, control the heating belt to energize. The control device includes a first determination module for determining the state of the compressor; a first acquisition module for acquiring the ambient temperature Tao when the compressor is not started; a first control module for when Tao>T0 , to control that the heating belt is not energized; the second acquisition module is used to acquire the exhaust temperature Td and the coil temperature Tc when Tao is less than or equal to T0; the second control module is used to control the temperature when Td≤Tc+5℃ The heating belt is energized. The control method and the control device can reduce the energy consumption of the heating belt of the fixed-frequency compressor in use, and reduce the loss of the heating belt.

Description

A kind of control method and control device of fixed frequency compressor heating belt

technical field

The invention relates to the technical field of compressors, in particular to a control method and a control device for a heating belt of a fixed-frequency compressor.

Background technique

The heating tape is an electrical device that is wound on the compressor casing and generates heat when it is energized to ensure the oil temperature of the compressor so that it can work normally.

At present, the fixed frequency compressor of the unit is usually controlled by the normally open main contact of the AC contactor, and the corresponding heating belt is controlled by the auxiliary normally closed contact of the contactor. When the unit is powered on, the heating belt is energized through the normally closed contact of the contactor. When the normally open contact of the contactor is closed, the normally closed contact of the contactor is disconnected when the compressor is started, and the heating belt is powered off and stops working. During the operation of the unit, as long as the unit is not powered off, the heating belt will be switched on and off with the start and stop of the compressor in this way.

When the unit is powered on but not turned on, the heating belt continues to consume power, resulting in meaningless energy consumption. When the unit is turned on and used, when the compressor meets the stopping conditions and stops, there is often a short-term shutdown and restart. During this period, the short-term power-on work of the heating belt is completely unnecessary. When the external ambient temperature is high, the compressor can be started without the heating of the heating belt, but the heating belt is still continuously energized under the existing control method. Under the existing heating belt control method, the heating belt of the fixed-frequency compressor has high energy consumption during use, and the heating belt loss is large.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a control method and a control device for a heating belt of a fixed-frequency compressor. In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended to be an extensive review, nor is it intended to identify key/critical elements or delineate the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the detailed description that follows.

According to a first aspect of the embodiments of the present invention, there is provided a method for controlling a heating belt of a fixed-frequency compressor, including: determining a state of the compressor, where the state of the compressor includes a non-starting operation of the compressor and a starting operation of the compressor; When the compressor does not start to work, obtain the external ambient temperature Tao; when Tao is greater than the set value T0, the control heating belt is not energized, and when Tao is greater than the set value T0, the external ambient temperature is enough to start the compressor, and the heating belt does not need to be energized Heating to reduce energy consumption; when Tao is less than or equal to T0, obtain the exhaust temperature Td and coil temperature Tc; when Td≤Tc+5℃, control the heating belt to energize. When Tao is less than or equal to T0, if the oil temperature of the compressor is not enough to start the compressor, that is, when Td≤Tc+5℃, the heating belt needs to be energized; on the contrary, if the oil temperature of the compressor is enough to start the compressor When working, that is, when Td>Tc+5°C, the heating belt does not need to be energized and heated, which reduces the energy consumption of the heating belt and reduces the loss of the heating belt.

Optionally, the control method further includes: after the heating band is energized, obtaining the duration t1 of the heating band being energized; determining the set value t10 of t1 according to Tao, where Tao is negatively correlated with t10; when t1 is equal to t10, Control heating belt power off. When the duration t1 of the heating belt energization is equal to the set value t10, the oil temperature of the compressor can make the compressor start to work. At this time, the heating belt is controlled to be powered off to avoid the meaningless energy consumption caused by the heating belt continuing to heat.

Optionally, the control method further includes: after the heating belt is energized, when Td≥Tc+10°C, obtaining the duration t2 of Td≥Tc+10°C; when t2 is equal to the set value t20, controlling the heating belt off Electricity. After the heating belt is energized, the compressor is heated. When Td≥Tc+10℃, the oil temperature of the compressor can start the compressor. When the duration t2 of Td≥Tc+10℃ is equal to the set value t20, Indicates that the oil temperature of the compressor is uniform and stable. At this time, the heating belt is controlled to be powered off to avoid the meaningless energy consumption caused by the continuous heating of the heating belt.

Optionally, the control method further includes: after the heating belt is powered off, obtaining the duration t3 of the heating belt power off; determining the set value t30 of t3 according to Tao, where Tao is positively correlated with t30; when t3 is equal to t30 , execute the determining of the state of the compressor. When the duration t3 of the heating belt power failure is equal to the set value t30, the state of the compressor is re-determined to ensure that the compressor starts to work.

Optionally, the control method further includes: after determining the state of the compressor, when the compressor starts to work, determining the state of the heating belt, the state of the heating belt includes a power-on state and a power-off state; when the state of the heating belt When it is in the energized state, obtain the duration t of the heating belt energization since the state of the heating belt is determined to be the energized state; when t is equal to the set value t0, the heating belt is controlled to be powered off. When the energization duration t of the heating belt is equal to the set value t0 since the state of the heating belt is determined to be energized, the heating belt does not need to be energized to continue heating, which reduces the energy consumption of the heating belt and reduces the loss of the heating belt.

According to a second aspect of the embodiments of the present invention, there is provided a control device for a heating belt of a fixed-frequency compressor, including a first determination module for determining a state of the compressor, where the state of the compressor includes that the compressor does not start to work and the compressor starts to work; the first acquisition module is used to acquire the external ambient temperature Tao when the compressor is not started to work; the first control module is used to control the heating belt when Tao is greater than the set value T0, and the heating belt is not energized. If it is greater than the set value T0, the ambient temperature is enough to start the compressor, and the heating belt does not need to be energized to reduce energy consumption; the second acquisition module is used to obtain the exhaust temperature Td and coil temperature when Tao is less than or equal to T0 Tc; the second control module is used to control the heating belt to be energized when Td≤Tc+5°C. When Tao is less than or equal to T0, if the oil temperature of the compressor is not enough to start the compressor, that is, when Td≤Tc+5℃, the heating belt needs to be energized; on the contrary, if the oil temperature of the compressor is enough to start the compressor When working, that is, when Td>Tc+5°C, the heating belt does not need to be energized and heated, which reduces the energy consumption of the heating belt and reduces the loss of the heating belt.

Optionally, the control device further includes: a third acquisition module, used to acquire the duration t1 of the heating strip after the heating strip is energized; a second determination module, used to determine the set value t10 of t1 according to Tao; The three control modules are used to control the power off of the heating belt when t1 is equal to t10. When the duration t1 of the heating belt energization is equal to the set value t10, the oil temperature of the compressor can make the compressor start to work, and at this time, the third control module controls the heating belt to be powered off, so as to avoid the no-nonsense caused by the continuous heating of the heating belt. Meaning energy consumption.

Optionally, the control device further includes: a fourth acquisition module, used for acquiring the duration t2 of Td≥Tc+10°C when Td≥Tc+10°C after the heating belt is energized; the fourth control module, using When t2 is equal to the set value t20, the control heating belt is powered off. After the heating belt is energized, the heating belt heats the compressor. When Td≥Tc+10℃, the oil temperature of the compressor can start the compressor. When Td≥Tc+10℃, the duration t2 is equal to the set value t20 When , it means that the oil temperature of the compressor is uniform and stable. At this time, the fourth control module controls the power off of the heating belt, so as to avoid the meaningless energy consumption caused by the continuous heating of the heating belt.

Optionally, the control device further includes: a fifth acquisition module, used to acquire the duration t3 of the heating strip after the heating belt is powered off; a third determination module, used to determine the set value t30 of t3 according to Tao. ; The first execution module is used to execute the determination of the state of the compressor when t3 is equal to t30. When the duration t3 of the heating belt power off is equal to the set value t30, the first execution module executes to re-determine the state of the compressor to ensure the compressor starts to work.

Optionally, the control device further includes: a fourth determining module, used for determining the state of the heating belt when the compressor starts to work after the first determining module determines the state of the compressor; a sixth obtaining module, using When the state of the heating belt is the energized state, obtain the duration t that the heating belt is energized from when the state of the heating belt is determined to be the energized state; the fifth control module is used to control the heating belt when t is equal to the set value t0 Power off. When the fourth determination module determines that the state of the heating belt is the energized state, when the duration t of the heating belt energization is equal to the set value t0, the heating belt does not need to be energized to continue heating, which reduces the energy consumption of the heating belt and reduces heating belt loss.

The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

The control method and device of the fixed-frequency compressor heating belt of the present invention controls the heating belt according to the external ambient temperature Tao, the exhaust temperature Td and the coil temperature Tc, so as to reduce the energy consumption of the fixed-frequency compressor heating belt in use, and reduce the Loss of heating tape.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description serve to explain the principles of the invention.

FIG. 1 is a schematic flowchart 1 of a method for controlling a heating belt of a fixed-frequency compressor according to an exemplary embodiment;

FIG. 2 is a second schematic flowchart of a method for controlling a heating belt of a fixed-frequency compressor according to an exemplary embodiment;

3 is a block diagram 1 of a control device for a fixed-frequency compressor heating belt according to an exemplary embodiment;

FIG. 4 is a second block diagram of a control device for a fixed-frequency compressor heating belt according to an exemplary embodiment;

Reference numeral description: 200-control device, 201-first determination module, 202-first acquisition module, 203-first control module, 204-second acquisition module, 205-second control module, 206-third acquisition module, 207 - second determination module, 208 - third control module, 209 - fourth acquisition module, 210 - fourth control module, 211 - fifth acquisition module, 212 - third determination module, 213 - first execution module , 214 - the fourth determination module, 215 - the sixth acquisition module, 216 - the fifth control module.

Detailed ways

The following description and drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. The examples represent only possible variations. Unless expressly required, individual components and functions are optional and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the invention includes the full scope of the claims, along with all available equivalents of the claims. Various embodiments may be referred to herein by the term "invention," individually or collectively, for convenience only, and are not intended to automatically limit the scope of this application to any if more than one invention is in fact disclosed. A single invention or inventive concept. Herein, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation and do not require or imply any actual relationship between these entities or operations or order. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method or apparatus comprising a list of elements includes not only those elements, but also others not expressly listed elements. The various embodiments herein are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and it is sufficient to refer to each other for the same and similar parts between the various embodiments. As for the structures, products, etc. disclosed in the embodiments, since they correspond to the parts disclosed in the embodiments, the descriptions are relatively simple, and the related parts can be referred to the descriptions of the methods.

FIG. 1 is a schematic flowchart 1 of a method for controlling a heating belt of a fixed-frequency compressor according to an exemplary embodiment.

As shown in FIG. 1 , the present invention provides a control method for a fixed-frequency compressor heating belt, which can be used to reduce the energy consumption of the fixed-frequency compressor heating belt in use and reduce the loss of the heating belt. Specifically, the control method The process steps include:

S101. Determine the state of the compressor;

After the unit is powered on, the state of the compressor includes the compressor not starting and the compressor starting, and different control methods are used for the two states of the compressor not starting and the compressor starting.

S102, when the compressor does not start to work, obtain the external ambient temperature Tao;

S103, when Tao is greater than the set value T0, the control heating belt is not energized;

When the external ambient temperature is high, that is, when Tao is greater than the set value T0, the compressor does not need to be heated by the heating belt, and the external ambient temperature is sufficient to start the compressor. The value range of the set value T0 is 17～20℃. More specifically, the value of T0 is 17°C, 18°C, 19°C or 20°C.

S104, when Tao is less than or equal to T0, obtain exhaust temperature Td and coil temperature Tc;

When Tao is less than or equal to T0, if the oil temperature of the compressor is not enough to start the compressor, it is necessary to control the heating band to be energized to start the compressor.

S105, when Td≤Tc+5°C, control the heating belt to be electrified.

When Tao is less than or equal to T0, if the oil temperature of the compressor is not enough to start the compressor, that is, when Td≤Tc+5℃, the heating belt needs to be energized; on the contrary, if the oil temperature of the compressor is enough to start the compressor When working, that is, when Td>Tc+5°C, the heating belt does not need to be energized and heated, which reduces the energy consumption of the heating belt and reduces the loss of the heating belt.

FIG. 2 is a second schematic flowchart of a method for controlling a heating belt of a fixed-frequency compressor according to an exemplary embodiment;

As shown in FIG. 2 , optionally, the control method further includes: after the heating belt is energized, obtaining the duration t1 of the heating belt energization; determining the set value t10 of t1 according to Tao, wherein Tao and t10 are negatively correlated; when t1 When equal to t10, the control heating belt is powered off. When the duration t1 of the heating belt energization is equal to the set value t10, the oil temperature of the compressor can start the compressor after the heating belt is energized and heated for t1 time. meaningless energy consumption.

The value range of the set value t10 is 1 to 5h. More specifically, the value of t10 is 1h, 2h, 3h, 4h or 5h.

Tao is negatively correlated with t10. When 10℃＜Tao≤T0, the value of t10 is 1h; when 0℃＜Tao≤10℃, the value of t10 is 2h; when -10℃＜Tao≤0℃ , the value of t10 is 3h; when Tao≤-10℃, the value of t10 is 4h.

In addition to the power-on duration t1 of the heating zone to control the power-off of the heating zone, the power-off of the heating zone can also be controlled by the duration t2 when the exhaust temperature Td and the coil temperature Tc satisfy the condition Td≥Tc+10°C.

Optionally, the control method further includes: after the heating belt is energized, when Td≥Tc+10°C, obtaining the duration t2 of Td≥Tc+10°C; when t2 is equal to the set value t20, controlling the heating belt to be powered off. After the heating belt is energized, the compressor is heated. When Td≥Tc+10℃, the oil temperature of the compressor can start the compressor. When the duration t2 of Td≥Tc+10℃ is equal to the set value t20, Indicates that the oil temperature of the compressor is uniform and stable. At this time, the heating belt is controlled to be powered off to avoid the meaningless energy consumption caused by the continuous heating of the heating belt.

The value range of the set value t20 is 4 to 8 minutes. More specifically, the value of t20 is 4min, 5min, 6min, 7min or 8min.

Use the duration t1 of the heating belt to be energized or use the duration t2 of the exhaust temperature Td and the coil temperature Tc to satisfy the condition Td≥Tc+10℃. When the compressor is not started, obtain the external ambient temperature Tao; when Tao is greater than the set value T0, the control heating belt is not energized; when Tao is less than or equal to T0, obtain the exhaust temperature Td and coil temperature Tc; when Td≤Tc+5℃, control the heating belt to energize.

Optionally, the control method further includes: after the heating belt is powered off, obtaining the duration t3 of the power off of the heating belt; determining the set value t30 of t3 according to Tao, where Tao is positively correlated with t30; when t3 is equal to t30, executing Determine the status of the compressor. When the duration t3 of the heating belt power failure is equal to the set value t30, the state of the compressor is re-determined to ensure that the compressor starts to work normally.

The value range of the set value t30 is 1 to 5h. More specifically, the value of t30 is 1h, 2h, 3h, 4h or 5h.

Tao is positively correlated with t30. When 10℃＜Tao≤T0, the value of t30 is 4h; when 0℃＜Tao≤10℃, the value of t30 is 3h; when -10℃＜Tao≤0℃, the value of t30 is 3h. The value of t30 is 2h; when Tao≤-10℃, the value of t30 is 1h.

Optionally, the control method further includes: after determining the state of the compressor, when the compressor starts to work, determining the state of the heating belt, and the state of the heating belt includes a power-on state and a power-off state. When the state of the heating belt is a power-off state, the power-off state of the heating belt is maintained. When the state of the heating belt is the energized state, obtain the duration t of the heating belt energization since the state of the heating belt is determined to be the energized state; when t is equal to the set value t0, the heating belt is controlled to be powered off. When the energization duration t of the heating belt is equal to the set value t0 since the state of the heating belt is determined to be energized, the heating belt does not need to be energized to continue heating, which reduces the energy consumption of the heating belt and reduces the loss of the heating belt.

The value range of the set value t0 is 4 to 8 minutes. More specifically, the value of t0 is 4min, 5min, 6min, 7min or 8min.

Fig. 3 is a block diagram 1 of a control device for a fixed-frequency compressor heating belt according to an exemplary embodiment.

As shown in FIG. 3 , the present invention provides a control device 200 for a fixed-frequency compressor heating belt, which can be used to reduce the energy consumption of the fixed-frequency compressor heating belt in use and reduce the loss of the heating belt. Specifically, the control Apparatus 200 includes:

The first determination module 201 is used to determine the state of the compressor; after the unit is powered on, the state of the compressor includes the compressor not working and the compressor starting working.

The first obtaining module 202 is configured to obtain the external ambient temperature Tao when the compressor is not started to work;

The first control module 203 is used to control the heating belt not to be energized when Tao is greater than the set value T0;

When the external ambient temperature is high, that is, when Tao is greater than the set value T0, the compressor does not need to be heated by the heating belt, and the external ambient temperature is sufficient to start the compressor. The value range of the set value T0 is 17～20℃. More specifically, the value of T0 is 17°C, 18°C, 19°C or 20°C.

The second obtaining module 204 is used to obtain the exhaust gas temperature Td and the coil temperature Tc when Tao is less than or equal to T0; when Tao is less than or equal to T0, if the oil temperature of the compressor is not enough to start the compressor, then It is necessary to control the heating band to be energized to make the compressor start to work.

The second control module 205 is configured to control the heating belt to be energized when Td≤Tc+5°C.

When Tao is less than or equal to T0, if the oil temperature of the compressor is not enough to start the compressor, that is, when Td≤Tc+5°C, the second control module 205 is required to control the heating band to energize; on the contrary, if the oil temperature of the compressor It is enough to start the compressor, that is, when Td>Tc+5°C, the heating belt does not need to be energized and heated, which reduces the energy consumption of the heating belt and reduces the loss of the heating belt.

Fig. 4 is a second block diagram of a control device for a fixed-frequency compressor heating belt according to an exemplary embodiment.

As shown in FIG. 4 , optionally, the control device 200 further includes: a third acquisition module 206 for acquiring the duration t1 of the heating belt energization after the heating belt is energized; a second determination module 207 for determining t1 according to Tao The set value t10 of t10; the third control module 208 is used to control the power off of the heating belt when t1 is equal to t10. When the duration t1 of the heating belt energization is equal to the set value t10, after the heating belt is energized and heated for t1 time, the oil temperature of the compressor can make the compressor start to work. At this time, the third control module 208 controls the heating belt to be powered off to avoid heating Useless energy consumption from continued heating of the belt.

The value range of the set value t10 is 1 to 5h. More specifically, the value of t10 is 1h, 2h, 3h, 4h or 5h.

Tao is negatively correlated with t10. When 10℃＜Tao≤T0, the value of t10 is 1h; when 0℃＜Tao≤10℃, the value of t10 is 2h; when -10℃＜Tao≤0℃ , the value of t10 is 3h; when Tao≤-10℃, the value of t10 is 4h.

Optionally, the control device 200 further includes: a fourth acquisition module 209 for acquiring the duration t2 of Td≥Tc+10°C when Td≥Tc+10°C after the heating belt is energized; the fourth control module 210, It is used to control the power off of the heating belt when t2 is equal to the set value t20. After the heating belt is energized, the compressor is heated. When Td≥Tc+10℃, the oil temperature of the compressor can start the compressor. When the duration t2 of Td≥Tc+10℃ is equal to the set value t20, Indicates that the oil temperature of the compressor is uniform and stable. At this time, the heating belt is controlled to be powered off to avoid the meaningless energy consumption caused by the continuous heating of the heating belt.

The value range of the set value t20 is 4 to 8 minutes. More specifically, the value of t20 is 4min, 5min, 6min, 7min or 8min.

Optionally, the control device 200 further includes: a fifth acquisition module 211, used for acquiring the duration t3 of the heating strip after the heating belt is powered off; a third determination module 212, for determining the set value of t3 according to Tao t30; the first execution module 213 is configured to execute determining the state of the compressor when t3 is equal to t30. When the duration t3 of the heating belt power off is equal to the set value t30, the first execution module 213 executes to re-determine the state of the compressor to ensure that the compressor starts to work normally.

The value range of the set value t30 is 1 to 5h. More specifically, the value of t30 is 1h, 2h, 3h, 4h or 5h.

Tao is positively correlated with t30. When 10℃＜Tao≤T0, the value of t30 is 4h; when 0℃＜Tao≤10℃, the value of t30 is 3h; when -10℃＜Tao≤0℃, the value of t30 is 3h. The value of t30 is 2h; when Tao≤-10℃, the value of t30 is 1h.

Optionally, the control device 200 further includes: a fourth determination module 214 for determining the state of the heating belt when the compressor starts to work after the first determination module 201 determines the state of the compressor; and a sixth obtaining module 215 for using When the state of the heating belt is the energized state, the duration t of the heating belt being energized from the time when the state of the heating belt is determined to be the energized state is obtained; the fifth control module 216 is used to control the heating when t is equal to the set value t0 with power outage. When the energization duration t of the heating belt is equal to the set value t0 since the state of the heating belt is determined to be energized, the heating belt does not need to be energized to continue heating, which reduces the energy consumption of the heating belt and reduces the loss of the heating belt.

The value range of the set value t0 is 4 to 8 minutes. More specifically, the value of t0 is 4min, 5min, 6min, 7min or 8min.

It should be understood that the present invention is not limited to the processes and structures that have been described above and shown in the accompanying drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It will also be understood that when used in the specification, the terms "comprising" and/or "comprising" designate the presence of features, integers, steps, operations, elements and/or components, but do not preclude the presence or addition of one or more other features , whole, step, operation, element and/or assembly.

The corresponding structures, materials, acts, and equivalents of all means or step plus function elements in the appended claims are intended to include any structure, material, or function for performing the function in combination with other claimed elements as specifically claimed. operate. The description of the present invention is presented for purposes of illustration and description, and is not intended to be exhaustive or to limit the invention to the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope of the present invention. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims (10)

1. A control method for a heating belt of a fixed-frequency compressor is characterized by comprising the following steps:

determining a state of the compressor;

when the compressor is not started to work, acquiring the external environment temperature Tao;

when Tao is larger than a set value T0, controlling the heating belt not to be electrified;

when Tao is less than or equal to T0, acquiring exhaust temperature Td and coil temperature Tc;

when Td is less than or equal to Tc +5 ℃, controlling the heating belt to be electrified.

2. The control method according to claim 1, characterized by further comprising:

acquiring the duration t1 of the electrification of the heating belt after the electrification of the heating belt;

determining a set value t10 of t1 according to Tao;

when t1 equals t10, the control heating belt is powered off.

3. The control method according to claim 1, characterized by further comprising:

after the heating belt is electrified, when Td is more than or equal to Tc +10 ℃, obtaining the duration t2 of the Td more than or equal to Tc +10 ℃;

when t2 is equal to the set value t20, the heating belt is controlled to be powered off.

4. The control method according to claim 2 or 3, characterized by further comprising:

after the heating belt is powered off, acquiring the duration t3 of the power-off of the heating belt;

determining a set value t30 of t3 according to Tao;

when t3 equals t30, the determining the state of the compressor is performed.

5. The control method according to claim 1, characterized by further comprising:

after the state of the compressor is determined, when the compressor starts to work, the state of a heating belt is determined;

when the state of the heating belt is an energized state, acquiring a duration t of energization of the heating belt from when it is determined that the state of the heating belt is the energized state;

when t is equal to the set value t0, the heating belt is controlled to be powered off.

6. A control device for a heating belt of a fixed-frequency compressor is characterized by comprising:

a first determination module for determining a state of the compressor;

the first acquisition module is used for acquiring the external environment temperature Tao when the compressor is not started to work;

the first control module is used for controlling the heating belt not to be electrified when Tao is larger than a set value T0;

a second acquisition module for acquiring an exhaust temperature Td and a coil temperature Tc when Tao is less than or equal to T0;

and the second control module is used for controlling the heating belt to be electrified when the Td is less than or equal to Tc +5 ℃.

7. The control device according to claim 6, characterized by further comprising:

the third acquiring module is used for acquiring the duration t1 of the electrification of the heating belt after the electrification of the heating belt;

a second determination module for determining a set value t10 of t1 according to Tao;

and the third control module is used for controlling the power off of the heating belt when t1 is equal to t 10.

8. The control device according to claim 6, characterized by further comprising:

the fourth acquisition module is used for acquiring the duration t2 of Td being more than or equal to Tc +10 ℃ when Td is more than or equal to Tc +10 ℃ after the heating belt is electrified;

and the fourth control module is used for controlling the power off of the heating belt when t2 is equal to the set value t 20.

9. The control device according to claim 7 or 8, characterized by further comprising:

the fifth acquisition module is used for acquiring the power-off duration t3 of the heating belt after the heating belt is powered off;

a third determining module, configured to determine a set value t30 of t3 according to Tao;

a first execution module to execute determining a state of the compressor when t3 equals t 30.

10. The control device according to claim 6, characterized by further comprising:

the fourth determining module is used for determining the state of the heating belt when the compressor starts to work after the first determining module determines the state of the compressor;

a sixth acquisition module configured to acquire, when the state of the heating belt is the energized state, a duration t of energization of the heating belt from when it is determined that the state of the heating belt is the energized state;

and the fifth control module is used for controlling the power off of the heating belt when t is equal to the set value t 0.

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