CN212563583U - Compressor starting device and variable-frequency air conditioning system - Google Patents
Compressor starting device and variable-frequency air conditioning system Download PDFInfo
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- CN212563583U CN212563583U CN202022726868.3U CN202022726868U CN212563583U CN 212563583 U CN212563583 U CN 212563583U CN 202022726868 U CN202022726868 U CN 202022726868U CN 212563583 U CN212563583 U CN 212563583U
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Abstract
The utility model provides a compressor starting device and a variable frequency air conditioning system; the device comprises a driver and a heating belt; the driver comprises a power module, a temperature sampling module and a control module; the temperature sampling module is connected with the control module; the control module is connected with the power module; the power module is respectively connected with the first relay and the second relay; one end of the heating belt is connected with the second contact end of the second relay, and the other end of the heating belt is connected with the second contact end of the first relay and is connected to a motor of the compressor together; the first relay and the second relay are both connected with the control module; the utility model can realize the simultaneous heating of the shell and the motor of the compressor, so that the heating efficiency is higher, and the low-temperature starting capability of the compressor is effectively improved; the complexity of the system is reduced, so that the control is simpler and safer; the heating process of the compressor is optimized, the overall operation reliability and efficiency are improved, and therefore power consumption is reduced.
Description
Technical Field
The utility model belongs to the technical field of the compressor, especially, relate to a compressor starting drive and variable frequency air conditioning system.
Background
When the compressor is exposed in a low-temperature environment for a long time, the refrigerant of the system can completely return to the cavity of the compressor, and the starting resistance of the compressor is increased due to the solidification of lubricating oil in the low-temperature environment, so that the compressor can not be started.
The existing compressor is started at low temperature by adopting the following two schemes:
(1) a compressor shell heating and temperature monitoring system controlled by a control panel (main control panel);
(2) the compressor driver preheats the compressor by injecting a controlled current into the compressor stator according to a main control command.
For the scheme (1), a corresponding temperature sensing and heater power supply control loop needs to be added on the main control board, the hardware complexity of the main control board is high, strong current and weak current are not easy to separate, and controlled large current is difficult to output.
For the scheme (2), preheating of the compressor stator is difficult to heat all parts of the compressor synchronously due to the influence of the structure of the compressor, the efficiency is low, and the starting time is greatly influenced.
SUMMERY OF THE UTILITY MODEL
In view of the above shortcoming of the prior art, the utility model aims to provide a compressor starting drive and inverter air conditioning system for it is complicated to solve current compressor heating control system, and heating efficiency is low, causes the poor problem of compressor low temperature start ability.
To achieve the above and other related objects, the present invention provides a compressor starting apparatus, including: a driver and a heating belt; wherein the driver includes: the device comprises a power module, a temperature sampling module and a control module; the temperature sampling module is connected with the control module and is used for collecting the current environment temperature of the driver; the control module is connected with one input end of the power module and is used for controlling the driver to enter a normal operation mode or a preheating mode according to the current environment temperature and the shutdown time of the compressor; the first output end of the power module is respectively connected with a first contact end of a first relay and a first contact end of a second relay; the heating belt is arranged outside the shell of the compressor, one end of the heating belt is connected with the second contact end of the second relay, and the other end of the heating belt is connected with the second contact end of the first relay and is commonly connected to the motor of the compressor; the first relay and the second relay are connected with the control module and used for realizing contact disconnection or contact closing under the control action of the control module.
In an embodiment of the present invention, the method further includes: a PTC module; one end of the PTC module is connected with the second contact end of the first relay, and the other end of the PTC module is connected with the other end of the heating belt and used for realizing auxiliary control current.
In an embodiment of the present invention, the method further includes: a current sampling module; the current sampling module is respectively connected with the power module and the control module and used for collecting the output current of the power module and sending the output current to the control module, so that the control module adjusts the direct-current voltage and judges whether the preheating is finished or not according to the output current.
In an embodiment of the present invention, the second output end and the third output end of the power module are both connected to the motor.
In an embodiment of the present invention, the first relay and the second relay are integrally packaged in the driver.
In an embodiment of the present invention, the control module adopts an MCU; the PTC module adopts a PTC thermistor; the power module adopts an IPM module or a PIM module.
The utility model provides a variable frequency air conditioning system, which comprises the compressor starting device and a compressor; the compressor starting device is connected with the compressor and used for starting the compressor.
As above, compressor starting drive and inverter air conditioning system, following beneficial effect has:
(1) compared with the prior art, the utility model discloses can realize the shell and the motor of simultaneous heating compressor for heating efficiency is higher, has effectively improved the low temperature starting ability of compressor.
(2) The utility model discloses a detect output current, obtain the electric current change of heating band on compressor stator electric current and the compressor housing, derive the change of compressor temperature, need not the compressor temperature of resampling for the separation of the strong and weak electricity of compressor part, when reducing the interference, reduced the system complexity, make control more simple safety.
(3) The whole heating starting process is completely controlled by the driver, the shutdown time and the ambient temperature are comprehensively considered, the heating process of the compressor is optimized, the integral operation reliability and efficiency are improved, and the power consumption is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a compressor starting device according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a compressor starting device according to another embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an inverter air conditioning system according to an embodiment of the present invention.
Description of the reference symbols
1 driver
101 power module
102 temperature sampling module
103 control module
104 current sampling module
2 heating belt
3 compressor
4 electric machine
5 PTC module
31 starting device of compressor
32 compressor
Detailed Description
The following description is provided for illustrative embodiments of the present invention, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
Compared with the prior art, the compressor starting device and the variable frequency air conditioning system can realize the simultaneous heating of the shell and the motor of the compressor, so that the heating efficiency is higher, and the low-temperature starting capability of the compressor is effectively improved; the utility model discloses a detection output current obtains the current change of compressor stator electric current and heating band on the compressor housing, deduces the change of compressor temperature, need not to resample compressor temperature again for the separation of compressor part strong and weak electricity, when reducing the interference, has reduced the system complexity, makes control more simple safety; the whole heating starting process is completely controlled by the driver, the shutdown time and the ambient temperature are comprehensively considered, the heating process of the compressor is optimized, the integral operation reliability and efficiency are improved, and the power consumption is reduced.
As shown in fig. 1, in an embodiment, the starting apparatus of the present invention includes a driver 1 and a heating belt 2.
The driver 1 includes a power module 101, a temperature sampling module 102, and a control module 103.
Specifically, the temperature sampling module 102 is connected to the control module 103, and is configured to collect a current ambient temperature of the driver 1, and send the current ambient temperature to the control module 103.
It should be noted that, the driver 1 and the compressor 3 are installed in the same space, and the ambient temperatures of the driver 1 and the compressor 3 are the same, so the current ambient temperature of the driver 1 is collected, that is, the current ambient temperature of the compressor 3 is collected.
Specifically, the control module 103 is connected to an input end of the power module 101, and is configured to control the driver 1 to enter a normal operation mode or a preheating mode according to the current ambient temperature and the shutdown time of the compressor.
It should be noted that, the temperature of the motor 4 in the compressor 3 is still very high and is much higher than the current ambient temperature within a period of shutdown, so, at this time, if only according to the current ambient temperature, it is relatively unreasonable to control whether the driver 1 enters the normal operation mode or the preheating mode, for example, within a period of shutdown of the compressor 3, if the compressor 3 is started at this time, the compressor can be started normally, but because the current ambient temperature collected at this time is low, the control module 103 controls the driver to enter the preheating mode, the preheating process at this time is unnecessary, which not only causes waste of resources, but also has the problem that the motor 4 is too high in temperature and affects the normal operation of the motor 4.
Specifically, when the downtime is less than a preset time threshold, or when the downtime is not less than the preset time threshold and the current environment temperature is not less than a preset temperature threshold, the driver is controlled to enter the normal operation mode; when the downtime is not less than the preset time threshold and the current environment temperature is less than the preset temperature threshold, controlling the driver to enter the preheating mode.
It should be noted that, the preset time threshold and the preset temperature threshold are both preset, and the specific value thereof is not a limitation of the present invention.
It should be noted that the whole preheating control is optimized by comprehensively considering the shutdown time and the ambient temperature, so that the overall operation reliability and efficiency of the compressor starting device are improved, and the power consumption is reduced.
Specifically, the first output terminal (i) of the power module 101 is respectively connected with the first contact terminal (i) of a first relay K1 and the first contact terminal (i) of a second relay K2; the heating belt 2 is arranged outside the shell of the compressor 3, one end of the heating belt 2 is connected with the second contact end of the second relay K2, and the other end of the heating belt 2 is connected with the second contact end of the first relay K1 and is connected to the motor 4 of the compressor 3 together; the first relay K1 and the second relay K2 are both connected with the control module 103 and used for realizing contact opening or contact closing under the control action of the control module 103.
Note that, in the prior art, the power supply of the heating belt 2 is derived from the main control board, and in the present invention, the power supply of the heating belt 2 is moved to the driver 1.
It should be noted that, when the driver 1 enters the normal operation mode, the control module 103 controls the contact of the first relay K1 to be closed and the contact of the second relay K2 to be opened, and controls the power module 101 to output the ac voltage to the motor 4, so as to normally start the compressor 3.
It should be noted that, when the driver 1 enters the preheating mode, the control module 103 controls the contact of the first relay K1 to be opened, the contact of the second relay K2 to be closed, and the power module 101 to output a dc voltage to the heating belt 2 and the motor 4, so as to preheat the compressor 3; or, the control module 103 controls the contact of the first relay K1 to be closed, the contact of the second relay K2 to be opened, and the power module 101 to output the dc voltage to the motor 4, so as to preheat the compressor 3 (such heating actually heats the stator in the motor 4).
It should be noted that, by controlling the contacts of the first relay K1 and the second relay K2 to be opened or closed, the motor 4 can be heated independently, or the motor 4 and the heating belt 2 can be heated simultaneously; the motor 4 and the heating belt 2 are heated at the same time, so that the driver 1 is heated more efficiently when operating in the preheating mode, thereby enabling the compressor 3 to be started more quickly.
Furthermore, the preheating process can be adjusted by adjusting the size of the direct-current voltage, so that the overall operation efficiency of the compressor starting device is improved.
It should be noted that after the preheating is completed, the control module 103 controls the driver 1 to enter the normal operation mode from the preheating mode, that is, after the preheating is completed, the control module 103 controls the contacts of the first relay K1 to be closed, the contacts of the second relay K2 to be opened, and the power module 101 to output the ac voltage to the motor 4, so as to normally start the compressor 3.
Further, the control module 103 may also determine whether preheating is completed according to a change in resistance of a stator coil of the motor 4 caused by a temperature change.
In one embodiment, the device further comprises a PTC module 5; one end of the PTC module 5 is connected to the second contact end of the first relay K1, and the other end of the PTC module 5 is connected to the other end of the heating belt 2, so as to realize auxiliary control of current.
Note that, by adding the PTC module 5, an effective current suppression effect at high temperatures is achieved.
It should be noted that, the PTC module 5 adopts a conventional high-power PTC module, so that cost reduction can be achieved.
In one embodiment, the PTC module 5 is a PTC thermistor (positive temperature coefficient thermistor).
In one embodiment, a current sampling module 104 is also included.
Specifically, the current sampling module 104 is respectively connected to the power module 101 and the control module 103 (connected in series to the output end of the power module 101), and is configured to collect the output current of the power module 101 and send the output current to the control module 103, so that the control module 103 adjusts the dc voltage and determines whether the preheating is completed according to the output current.
It should be noted that, as the heating process proceeds, the temperature of the compressor is continuously increased, and the resistance values of the resistor and the PTC thermistor in the motor 4 are increased while the temperature is increased, so that the output current is reduced; specifically, when the output current is less than a preset current threshold, the preheating is completed.
It should be noted that the preset current threshold is preset, and the specific value thereof is not a limitation of the present invention, and can be set according to the actual application scenario.
Further, the preset current threshold value can be dynamically adjusted according to any one or a combination of several of the current ambient temperature, the shutdown time of the compressor 3, the parameters of the compressor 3 and the output current of the power module 101, so as to improve the overall operation efficiency of the compressor starting device.
Further, according to the output current of the power module 101, a first current change corresponding to the motor 4 and a second current change corresponding to the heating belt 2 can be obtained, so as to calculate the temperature rise change of the compressor 3 according to the first current change and the second current change.
Specifically, according to the output current, a first current change corresponding to the motor 4 (stator) and a second current change corresponding to the heating belt 2 are obtained, so as to calculate a corresponding resistance change according to the first current change and the second current change, and further calculate a temperature rise change of the compressor 3 by combining the resistance change.
It should be noted that the stator current of the compressor 3 and the current change of the heating band 2 on the shell of the compressor 3 are obtained through the sampled output current, the temperature change of the compressor 3 is deduced, and the temperature of the compressor 3 does not need to be sampled again, so that the strong current and the weak current of part of the compressor 3 are separated, the interference is reduced, the system complexity is reduced, and the control is simpler and safer.
It should be noted that, by comparing the temperature rise change with a preset temperature rise threshold, it can be determined whether the preheating is completed; specifically, if the temperature rise change is greater than the preset temperature rise threshold, preheating is completed; otherwise, if the temperature rise change is less than or equal to the preset temperature rise threshold, the preheating is not completed.
It should be noted that the preset temperature rise threshold is preset, and the specific value thereof is not taken as a condition for limiting the present invention, and can be determined according to the actual application scenario.
In an embodiment, the current sampling module 104 is integrally packaged in the driver 1.
It should be noted that the current sampling module 104 can be integrated and packaged in the driver 1, and can be set independently of the driver 1, as long as it can collect the output current of the power module 101 and feed back the output current to the control module 103, and the specific packaging position is not taken as a limitation of the present invention; in a similar way, the temperature sampling module 102 and the control module 103 are also not limited to the circuit structure inside the driver 1, as long as corresponding functions can be realized, and the specific position is not limited as well, the conditions of the present invention are only unified and integrated to be packaged in the driver 1, so as to reduce the occupied space and realize the volume minimization.
Further, this power module 101, temperature sampling module 102, control module 103 and current sampling module 104 are the common technical means in the field, and its concrete circuit structure does not all regard as the restriction the utility model discloses a condition, so, do not constitute and the theory of operation details to its circuit structure here yet.
In one embodiment, the control module 103 is an MCU; the power module 101 is an IPM module or a PIM module.
In one embodiment, the first relay K1 and the second relay K2 are integrally packaged within the driver 1.
Specifically, the connection of the first relay K1 and the second relay K2 to the heating belt 2 is achieved by adding two connection terminals H1 and H2 in the driver 1. It should be noted that the terminals H1 and H2 are of the same size or have a reduced power level as the terminals on the output side of the driver 1 itself, and are located close together.
In an embodiment, the second output terminal and the third output terminal of the power module 101 are both connected to the motor 4.
It should be noted that the input voltage of the driver 1 is a single-phase/three-phase alternating current; specifically, the single-phase/three-phase ac power is input to the power module 101, and then output from the power module 101 to the subsequent circuit (the compressor 3 and/or the heating belt 2, etc.).
As shown in fig. 1, when the input side of the power module 101 is three-phase power (RST) and the output side of the power module 101 is three-phase output, the first output terminal of the power module 101 is correspondingly connected with an output line W, the first output terminal is respectively connected with the first contact terminal of the first relay K1 and the first contact terminal of the second relay K2, the second output terminal of the power module 101 is correspondingly connected with an output line V, the second output terminal is connected with the motor 4, the third output terminal of the power module 101 is correspondingly connected with an output line U, the third output terminal is also connected with the motor 4, and is equivalent to the first relay K1 connected in series to the output line W, and the second relay K2 is connected in series with the heating tape 2 and then connected in parallel to the first relay K1.
In the present embodiment, the current sampling module 104 is used for sampling three-phase currents on the output line W, the output line V and the output line U of the power module 101.
It should be noted that the output currents of the output line V and the output line U of the power module 101 are always the same, and when the first relay K1 contact is opened and the second relay K2 contact is closed, the output current of the output line W is different from the output currents of the output line V and the output line U, because the loads are different, the loads on the output line W are the motor 4, the heating tape 2 and the PTC thermistor, and the load on the output line U, V is only the motor 4.
Further, the current sampling module 104 may be configured to sample only the output current of the output line W and the output line V/U of the power module 101, that is, only the two-phase current (as shown by the dotted line in fig. 1, the dotted line indicates that the output current of the output line V or the output line U of the power module 101 sampled by the current sampling module 104 does not exist, and when the dotted line in fig. 1 is a solid line, it indicates that the current sampling module 104 samples the three-phase current of the output line W, the output line V, and the output line U of the power module 101).
In this embodiment, it can be determined whether the preheating is completed according to the output current on the output line W, or according to the output current on the output line U and/or the output line V.
Further, on the premise that the magnitude of the direct-current voltage is known, whether preheating is finished or not can be judged according to the change of the resistance on the output line U and/or the output line V; specifically, by determining whether the rise of the resistance on output line U and/or output line V exceeds a preset ratio.
Such as at time t0, Rt0＝Ut0/It0(ii) a After t time from time t0, Rt0+t＝Ut0+t/It0+t。
Then, Rt0+t/Rt0＝It0/It0+t。
Judgment of Rt0+t/Rt0Whether the value of (d) exceeds a preset ratio.
It should be noted that the preset ratio is preset, and the specific value thereof is not a limitation of the present invention.
If R ist0+t/Rt0If the value of (b) exceeds a preset ratio, preheating is completed.
It should be noted that, by changing the resistance, it is determined whether or not the preheating is completed, and it is determined whether or not the current is substantially, only the angle is different.
As shown in fig. 2, when the input side of the power module 101 is single-phase power (L in fig. 2 represents a live wire end of the single-phase power, and N represents a neutral wire end of the single-phase power), and the output side of the power module 101 is still single-phase output, the first relay K1, the second relay K2, and the heating tape 2 are the same as those in fig. 1, and when the input side of the power module 101 is three-phase power, the corresponding connection mode is the same, and the operation principle is the same, which is not described herein again.
As shown in fig. 3, in an embodiment, the inverter air conditioning system of the present invention includes the compressor starting device 31 and the compressor 32.
Specifically, the compressor starting device 31 is connected to the compressor 32 and is commonly installed in an outdoor unit of the inverter air conditioning system; wherein the compressor starting device 31 is used for realizing the starting of the compressor 32.
It should be noted that, under the condition that the ambient temperature is low, the inverter air conditioning system does not enter the operating state, and the driver is not powered off, the driver may also output a smaller preheating current at regular time, so as to ensure that the compressor 32 is at the proper operating temperature, shorten the start-up waiting time, and accelerate the response of the inverter air conditioning system.
To sum up, compared with the prior art, the compressor starting device and the variable frequency air conditioning system of the utility model can realize the simultaneous heating of the shell and the motor of the compressor, so that the heating efficiency is higher, and the low temperature starting capability of the compressor is effectively improved; the utility model discloses a detection output current obtains the current change of compressor stator electric current and heating band on the compressor housing, deduces the change of compressor temperature, need not to resample compressor temperature again for the separation of compressor part strong and weak electricity, when reducing the interference, has reduced the system complexity, makes control more simple safety; the whole heating starting process is completely controlled by the driver, the shutdown time and the environment temperature are comprehensively considered, the heating process of the compressor is optimized, the integral operation reliability and efficiency are improved, and the power consumption is reduced; therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. A compressor starting device, comprising: a driver and a heating belt; wherein the driver includes: the device comprises a power module, a temperature sampling module and a control module;
the temperature sampling module is connected with the control module and is used for collecting the current environment temperature of the driver;
the control module is connected with one input end of the power module and is used for controlling the driver to enter a normal operation mode or a preheating mode according to the current environment temperature and the shutdown time of the compressor;
the first output end of the power module is respectively connected with a first contact end of a first relay and a first contact end of a second relay;
the heating belt is arranged outside the shell of the compressor, one end of the heating belt is connected with the second contact end of the second relay, and the other end of the heating belt is connected with the second contact end of the first relay and is commonly connected to the motor of the compressor;
the first relay and the second relay are connected with the control module and used for realizing contact disconnection or contact closing under the control action of the control module.
2. The starting apparatus for a compressor according to claim 1, further comprising: a PTC module; one end of the PTC module is connected with the second contact end of the first relay, and the other end of the PTC module is connected with the other end of the heating belt and used for realizing auxiliary control current.
3. The starting apparatus for a compressor according to claim 1, further comprising: a current sampling module; the current sampling module is respectively connected with the power module and the control module and used for collecting the output current of the power module and sending the output current to the control module, so that the control module adjusts the direct-current voltage output by the power module to the motor and judges whether the preheating of the compressor is finished or not according to the output current.
4. The compressor starting device of claim 1, wherein the second output and the third output of the power module are each connected to the motor.
5. The compressor starting device of claim 1, wherein the first relay and the second relay are integrally packaged within the driver.
6. The starting device of the compressor as claimed in claim 2, wherein the control module employs an MCU; the PTC module adopts a PTC thermistor; the power module adopts an IPM module or a PIM module.
7. An inverter air conditioning system, characterized by comprising a compressor starting device and a compressor of any one of claims 1 to 6;
the compressor starting device is connected with the compressor and used for starting the compressor.
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| CN202022726868.3U CN212563583U (en) | 2020-11-23 | 2020-11-23 | Compressor starting device and variable-frequency air conditioning system |
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| CN112483359A (en) * | 2020-11-23 | 2021-03-12 | 儒竞艾默生环境优化技术（上海）有限公司 | Compressor starting device and method and variable-frequency air conditioner system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112483359A (en) * | 2020-11-23 | 2021-03-12 | 儒竞艾默生环境优化技术（上海）有限公司 | Compressor starting device and method and variable-frequency air conditioner system |
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Address after: 200433 room 323, No. 1101-163, National Road, Shanghai, Yangpu District Patentee after: Shanghai Rujing Intelligent Control Technology Co.,Ltd. Address before: Room 1101-163, 323 Guoding Road, Yangpu District, Shanghai 200433 Patentee before: RUKING EMERSON CLIMATE TECHNOLOGIES (SHANGHAI) Co.,Ltd. |