Energy storage structure, air conditioner and control method

Abstract

The invention provides an energy storage structure, an air conditioner and a control method. The energy storage module is used for storing energy; the control module is used for detecting whether the driving module is about to stop or not when the driving module is started; when the driving module is about to stop, the driving module charges the energy storage module, and when the driving module is not stopped, the energy storage module is disconnected with the driving module, the energy storage structure effectively utilizes redundant electric energy, and the technical problem that the energy utilization rate in the refrigerating system is low is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to an energy storage structure, an air conditioner and a control method. Background Art

[0002] With the advancement of science and technology, air conditioning is playing an increasingly important role in our lives. The world is facing an energy crisis. On the one hand, it is necessary to develop new energy sources, and on the other hand, it is necessary to manage existing products for energy conservation. At present, building energy consumption has become a giant in energy consumption, among which the HVAC industry accounts for the majority of energy consumption. In the research of air-conditioning systems, energy-saving research has very important economic benefits and social significance, and energy conservation and emission reduction are imminent.

[0003] At present, electronic products in all walks of life tend to be variable frequency, and air conditioners are no exception. The moving parts of the fan motor and compressor in the full variable frequency air conditioning system require a drive module.

[0004] However, the drive module is equipped with capacitor components of various forms. Once the unit is started, the capacitor begins to charge and carry voltage. When encountering a fault or replacing parts, it needs to be discharged statically. The voltage in the capacitor needs to be consumed before it can be replaced, otherwise there will be safety hazards. In addition, during the capacitor discharge process, this part of the electrical energy is not effectively utilized. Moreover, at the moment of starting, the motor speed is zero, which will generate a strong starting current and cause serious damage to the drive module.

[0005] Therefore, the prior art needs to be further developed. Summary of the invention

[0006] The purpose of the present invention is to overcome the above technical deficiencies and provide an energy storage structure, an air conditioner and a control method to solve the technical problem of low energy utilization rate in the refrigeration system in the related art.

[0007] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: providing an energy storage structure, including: a drive module, used for doing work; an energy storage module, used for storing energy; a control module, when the drive module is started, the control module is used to detect whether the drive module is about to shut down; when the drive module is about to shut down, the drive module charges the energy storage module, and when the drive module is not shut down, the energy storage module is disconnected from the drive module.

[0008] Furthermore, the driving module includes a driving circuit and a load, the driving circuit is used to supply power to the load to drive the load to move; the capacitor of the driving circuit is connected to the energy storage module, and the motor of the load is connected to the energy storage module; and / or the energy storage module includes a battery.

[0009] An air conditioner comprises an energy storage structure, wherein the energy storage structure is the above-mentioned energy storage structure.

[0010] Furthermore, the driving module includes: a fan motor, which is connected to the energy storage module to charge the energy storage module; and / or a compressor, whose motor is connected to the energy storage module to charge the energy storage module.

[0011] A control method is applicable to the above-mentioned energy storage structure, and the control method includes: starting a drive module; determining whether the drive module is about to shut down; if so, controlling the energy storage module to be connected to the drive module, and the energy storage module uses the drive module to charge the energy storage module; if not, controlling the energy storage module to be disconnected from the drive module.

[0012] Furthermore, the method for determining whether the drive module is about to shut down includes: determining that the drive module is about to shut down when the operating frequency of the refrigeration system of the energy storage structure is equal to the set shutdown frequency, and / or determining that the drive module is about to shut down when the energy storage structure fails.

[0013] Furthermore, the method for charging the energy storage module by using the driving module includes: connecting the capacitor of the driving module to the energy storage module, and charging the electric energy generated by the capacitor into the energy storage module.

[0014] Furthermore, the method for charging the energy storage module by using the driving module includes: connecting the motor of the driving module to the energy storage module, and using the electric energy generated by the rotation of the motor to charge the energy storage module.

[0015] Furthermore, the method for controlling the energy storage module to be disconnected from the drive module includes: when the speed of the motor of the drive module is zero, controlling the energy storage module to be disconnected from the drive module; and / or, when the fault of the energy storage module is eliminated, controlling the energy storage module to be disconnected from the drive module; and / or, when the operating frequency of the refrigeration system including the energy storage structure is greater than the set shutdown frequency, controlling the energy storage module to be disconnected from the drive module.

[0016] Furthermore, the control method includes: determining whether the driving module needs power supply, and when the driving module needs power supply, connecting the energy storage module with the control module, and controlling the energy storage module to provide power to the control module.

[0017] Furthermore, the method for determining whether the driving module needs power supply includes: determining whether the motor and / or compressor of the energy storage structure needs to be started; if the motor and / or compressor of the energy storage structure needs to be started, controlling the energy storage module to provide power to the control module.

[0018] Beneficial effects:

[0019] 1. The energy storage structure of the present invention includes a drive module for doing work; an energy storage module for storing energy; and a control module. When the drive module is started, the control module is used to detect whether the drive module is about to shut down; when the drive module is about to shut down, the drive module charges the energy storage module, and when the drive module is not shut down, the energy storage module is disconnected from the drive module. With the above arrangement, when the drive module is about to shut down, the drive module is not required to do work. In this way, the energy inside the drive module will be released in vain, and even cause damage to itself. The energy storage module is used to store the excess electrical energy. In this way, the excess electrical energy is effectively utilized, solving the technical problem of low energy utilization in the refrigeration system.

[0020] 2. The control method adopted by the present invention enables the electric energy generated by the discharge of the capacitor on the driving board to be stored in the storage battery when the refrigeration system is shut down, which can not only recover energy but also reduce safety hazards; at the same time, in the refrigeration system, when the fan motor encounters deceleration (frequency reduction) or shutdown, the fan motor can be used as a generator to convert braking energy into electrical energy and store it in the battery to recover energy; the recovered energy can provide strong current support to the fan motor at the moment of unit startup to drive its operation, thereby reducing the starting load, reducing the probability of failure, and improving the unit startup reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of a refrigeration cycle of an energy storage structure adopted in an embodiment of the present invention;

[0022] Figure 2 is a circuit diagram of an embodiment of an energy storage structure adopted in an embodiment of the present invention;

[0023] Figure 3 is a circuit diagram of another embodiment of the energy storage structure adopted in the embodiment of the present invention;

[0024] Figure 4 is a flow chart of Example 1 of the control method adopted in the embodiment of the present invention;

[0025] Figure 5 is a flow chart of Embodiment 2 of the control method adopted in the embodiment of the present invention;

[0026] Figure 6 is a flow chart of Embodiment 3 of the control method adopted in the embodiment of the present invention;

[0027] Figure 7 It is a flow chart of Example 4 of the control method adopted in the embodiment of the present invention.

[0028] The above drawings include the following reference numerals:

[0029] 1. Drive module; 11. Load; 12. Capacitor; 13. Motor; 2. Energy storage module; 3. Control module; 4. Fan motor; 5. Compressor; 6. Outdoor heat exchanger; 7. Indoor heat exchanger. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0031] See also Figures 1 to 7 According to an embodiment of the present invention, an energy storage structure is provided, including: a drive module 1 for doing work; an energy storage module 2 for storing energy; a control module 3, when the drive module 1 is started, the control module 3 is used to detect whether the drive module 1 is about to shut down; when the drive module 1 is about to shut down, the drive module 1 charges the energy storage module 2, and when the drive module 1 is not shut down, the energy storage module 2 is disconnected from the drive module 1. With the above arrangement, when the drive module 1 is about to shut down, the drive module 1 is not required to do work at this time, so that the energy inside the drive module 1 will be released in vain, and even cause damage to itself, and the energy storage module 2 is used to store the excess electrical energy, so that the excess electrical energy is effectively utilized, solving the technical problem of low energy utilization in the refrigeration system.

[0032] In the energy storage structure of this embodiment, see Figures 1 to 3 The driving module 1 includes a driving circuit and a load 11, the driving circuit is used to supply power to the load 11 to drive the load 11 to move; the capacitor 12 of the driving circuit is connected to the energy storage module 2, and the motor of the load 11 is connected to the energy storage module 2; and / or the energy storage module 2 includes a battery.

[0033] Specifically, when the refrigeration system is shut down, the electric energy generated by the discharge of the capacitor on the driving board is stored in the storage battery, which can not only recover energy but also reduce safety hazards; at the same time, in the refrigeration system, when the fan motor and compressor encounter deceleration (frequency reduction) or shutdown, the fan motor and the motor in the compressor can be used as a generator to convert the braking energy into electrical energy and store it in the battery to recover energy; the recovered energy can provide strong current support to the compressor and fan motor at the moment of unit startup to drive their operation, thereby reducing the starting load, reducing the probability of failure, and improving the unit startup reliability.

[0034] The air conditioner of this embodiment includes an energy storage structure, and the energy storage structure is an energy storage structure. In this way, when the refrigeration system of the air conditioner is shut down, the electric energy generated by the discharge of the capacitor on the driving module is stored in the storage battery, which can not only recover energy but also reduce safety hazards.

[0035] See also Figures 1 to 3 In the energy storage structure of this embodiment, the driving module 1 includes: a fan motor 4, which is connected to the energy storage module 2 to charge the energy storage module 2; and / or a compressor 5, whose motor is connected to the energy storage module 2 to charge the energy storage module 2.

[0036] The control method of this embodiment, see Figures 4 to 7 , applicable to the above energy storage structure, the control method includes: starting the driving module 1; judging whether the driving module 1 is about to shut down; if so, controlling the energy storage module 2 to be connected to the driving module 1, and the energy storage module 2 uses the driving module 1 to charge the energy storage module 2; if not, controlling the energy storage module 2 to be disconnected from the driving module 1. In this way, when the refrigeration system of the air conditioner is shut down, the electric energy generated by the discharge of the capacitor on the driving module is stored in the storage battery, which can not only recover energy but also reduce safety hazards.

[0037] See also Figure 4 The method for judging whether the driving module 1 is about to shut down includes: when the operating frequency of the refrigeration system of the energy storage structure is equal to the set shutdown frequency, judging that the driving module 1 is about to shut down, and / or, when the energy storage structure fails, judging that the driving module 1 is about to shut down. In this way, the different conditions in the operation process of the energy storage structure are combined, and no matter in which state the shutdown occurs, energy can be stored, thereby increasing the energy utilization rate.

[0038] See also Figure 2 In the control method of this embodiment, the method for charging the energy storage module 2 using the driving module 1 includes: connecting the capacitor 12 of the driving module 1 to the energy storage module 2, and charging the electric energy generated by the capacitor 12 into the energy storage module 2.

[0039] Specifically, the capacitors on the fan motor and compressor variable frequency drive module are connected to the capacitor control module through wires and communication lines. After the refrigeration system is shut down, the electric energy generated by the discharge of the capacitor on the drive module is stored in the storage battery, and the electric energy is stored, that is, the electric energy is recovered.

[0040] See also Figure 3 In the control method of this embodiment, the method for charging the energy storage module 2 by using the driving module 1 includes: connecting the motor 13 of the driving module 1 to the energy storage module 2, and using the electric energy generated by the rotation of the motor 13 to charge the energy storage module 2.

[0041] Specifically, when the fan motor encounters deceleration (frequency reduction) or shutdown, the fan motor needs to decelerate from high frequency to low frequency or even stop. At this time, the fan motor can be used as a generator and connected to the motor control module through wires and communication lines to store the electrical energy generated by braking in the storage battery, that is, to recover electrical energy.

[0042] In the control method of this embodiment, the method of controlling the energy storage module 2 to disconnect from the drive module 1 includes: when the speed of the motor 13 of the drive module 1 is zero, controlling the energy storage module 2 to disconnect from the drive module 1; and / or, when the fault of the energy storage module 2 is eliminated, controlling the energy storage module 2 to disconnect from the drive module 1; and / or, when the operating frequency of the refrigeration system including the energy storage structure is greater than the set shutdown frequency, controlling the energy storage module 2 to disconnect from the drive module 1. In this way, the situation of the impending shutdown can be accurately judged.

[0043] In the control method of this embodiment, the control method includes: determining whether the driving module 1 needs power supply, and when the driving module 1 needs power supply, connecting the energy storage module 2 with the control module 3, and controlling the energy storage module 2 to provide power to the control module 3. In this way, when the system needs power, the energy storage module 2 supplies power to the control module 3, thereby effectively utilizing the stored power.

[0044] In the control method of this embodiment, the method for judging whether the driving module 1 needs power supply includes: judging whether the motor and / or compressor 5 of the energy storage structure needs to be started; if the motor and / or compressor 5 of the energy storage structure needs to be started, controlling the energy storage module 2 to provide power to the control module 3. In this way, the situation of needing power supply can be accurately judged, thereby improving the utilization rate of energy.

[0045] The energy storage structure of this embodiment is described as follows:

[0046] Embodiment 1:

[0047] See also Figure 4 After the unit is turned on, it runs at a predetermined frequency. When it is determined that the unit is about to shut down, part of the unit's electric energy will be used for useless work. At this time, the energy storage module 2 is connected to the drive module 1 to store the useless energy in the battery. If the unit is not about to shut down, the energy storage module 2 is disconnected from the drive module 1 to ensure the normal operation of the unit. In this way, the effective storage of excess energy is achieved.

[0048] Embodiment 2:

[0049] See also Figure 5After the unit is started, it runs at a predetermined frequency. When it is determined that the unit is about to shut down, part of the unit's electrical energy will be used for useless work. At this time, the energy storage module 2 is connected to the drive module 1 to store the useless energy in the battery. If the unit is not about to shut down, the energy storage module 2 is disconnected from the drive module 1 to ensure the normal operation of the unit.

[0050] After the unit is shut down for a period of time, it is detected whether the driving module 1 is started. If it is started, the energy storage module 2 should be disconnected from the driving module 1, thereby avoiding interference with the normal operation of the unit and ensuring the effective operation of the unit.

[0051] Embodiment three:

[0052] See also Figure 6 After the unit is started, it runs at a predetermined frequency. When it is determined that the unit is about to shut down, part of the unit's electrical energy will be used for useless work. At this time, the energy storage module 2 is connected to the drive module 1 to store the useless energy in the battery. If the unit is not about to shut down, the energy storage module 2 is disconnected from the drive module 1 to ensure the normal operation of the unit.

[0053] After the unit is shut down for a period of time, it is detected whether the driving module 1 needs to be started. If it needs to be started, the energy storage module 2 can be connected to the driving module 1 to start the driving module 1 and reduce the system load. In this way, the effective use of electric energy is achieved.

[0054] Embodiment 4:

[0055] See also Figure 1 , Figure 7 The compressor 5 discharges high-temperature and high-pressure refrigerant gas, which enters the outdoor heat exchanger 6, condenses and releases heat to become a low-temperature and high-pressure refrigerant liquid; after being throttled by the electronic expansion valve, it becomes a low-temperature and low-pressure two-phase fluid, enters the indoor heat exchanger 7 to evaporate and absorb heat to become a high-temperature and low-pressure refrigerant gas, and enters the air intake of the compressor 5, completing the entire refrigeration cycle.

[0056] The refrigeration system is a full variable frequency refrigeration system, and the fan motor 4 and the compressor 5 are driven by variable frequency drive modules respectively. The drive module 1 adjusts the frequency according to the actual load change, so that the unit operates in a reasonable range.

[0057] The capacitor 12 on the fan motor 4 and the compressor 5 variable frequency drive module 1 is connected to the capacitor 12 control module through a wire and a communication line. After the refrigeration system is shut down, the electric energy generated by the discharge of the capacitor 12 on the drive module 1 is stored in the storage battery, and the electric energy is stored, that is, the electric energy is recovered.

[0058] In the refrigeration system, when the fan motor 4 and the compressor 5 encounter deceleration (frequency reduction) or shutdown, the fan motor 4 and the compressor 5 need to decelerate from high frequency to low frequency or even shut down. At this time, the motors in the fan motor 4 and the compressor 5 can be used as generators, connected to the motor control module through wires and communication lines, and the electric energy generated by braking is stored in the storage battery, that is, electric energy is recovered.

[0059] The electric energy generated by the discharge of the capacitor 12 and the motor braking (i.e., the electric energy stored in the charging and discharging battery) can be used at the moment of unit startup to provide starting current support to the compressor 5 and the fan motor 4, thereby reducing the starting load. In particular, the probability of the outdoor fan failing to start in the case of adverse wind can be reduced, thereby improving the unit startup and operation reliability.

[0060] Figure 2 , Figure 3 The load in the circuit may be a fan motor 4, a compressor 5, or other electrical components.

[0061] The control method of this embodiment is described as follows:

[0062] The unit shutdown is divided into shutdown due to reaching the temperature point (standby) or shutdown due to failure;

[0063] The set frequency for the refrigeration cycle system to stop (standby) when it reaches the temperature point is F, where F is a settable value (such as 15Hz); when it is detected that the mainboard set frequency F is 15Hz, the unit has reached the temperature point and stopped (standby);

[0064] Fault shutdown, including but not limited to shutdown caused by exhaust high pressure protection, exhaust high temperature, low pressure protection, drive failure, etc.

[0065] Refrigeration cycle instrumentation and control system, real-time monitoring and feedback of the operating (set) frequency value of the whole machine mainboard, as well as various whole machine protection actions;

[0066] When the instrumentation and control system detects that the whole machine stops (standby) at a temperature point, or stops due to a fault, the instrumentation and control system dispatches to connect the capacitor 12 on the fan motor 4 and the compressor 5 drive module 1 to the storage battery through the capacitor 12 control module, and at the same time, connects to the storage battery through the motor control module to perform charging;

[0067] When the instrumentation and control system detects that the motor speed is zero, or the set frequency of the whole machine is F>15Hz, or the shutdown fault has been resolved, the instrumentation and control system dispatches to disconnect the capacitor 12 on the fan motor 4 and the compressor 5 drive module 1 from the storage battery through the capacitor 12 control module, and at the same time, disconnect the motor control module from the storage battery, and the whole machine enters the normal refrigeration control mode;

[0068] The whole machine can be operated in modules (for example, 16 modules), and the storage batteries of the 16 modules can be combined together to form a large storage battery. The electric energy in the storage battery can be used at the moment of starting a certain unit (or several units) to provide starting current support to electrical devices such as the compressor 5 and the fan motor 4 to reduce the starting load.

[0069] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0070] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0071] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0072] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0073] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. An energy storage structure, characterized in that: include: A driving module (1), used for performing work; An energy storage module (2), used for storing energy; A control module (3), when the drive module (1) is started, the control module (3) is used to detect whether the drive module (1) is about to shut down; When the driving module (1) is about to shut down, the driving module (1) charges the energy storage module (2); when the driving module (1) is not shut down, the energy storage module (2) is disconnected from the driving module (1).

2. The energy storage structure according to claim 1, characterized in that: The driving module (1) comprises a driving circuit and a load (11), wherein the driving circuit is used to supply power to the load (11) so as to drive the load (11) to move; a capacitor (12) of the driving circuit is connected to the energy storage module (2), and a motor of the load (11) is connected to the energy storage module (2); and / or, The energy storage module (2) comprises a battery.

3. An air conditioner, comprising an energy storage structure, characterized in that: The energy storage structure is the energy storage structure according to claim 1 or 2.

4. The air conditioner according to claim 3, characterized in that: The driving module (1) comprises: a fan motor (4), the fan motor (4) being connected to the energy storage module (2) to charge the energy storage module (2); and / or, A compressor (5), wherein a motor of the compressor (5) is connected to the energy storage module (2) to charge the energy storage module (2).

5. A control method, applicable to the energy storage structure according to claim 1 or 2, characterized in that: The control method comprises: Start the driver module (1); Determining whether the drive module (1) is about to shut down; If so, controlling the energy storage module (2) to be connected to the driving module (1), so that the energy storage module (2) uses the driving module (1) to charge the energy storage module (2); If not, the energy storage module (2) is controlled to be disconnected from the driving module (1).

6. The control method according to claim 5, characterized in that: The method for determining whether the drive module (1) is about to shut down comprises: When the operating frequency of the refrigeration system of the energy storage structure is equal to the set shutdown frequency, it is determined that the driving module (1) is about to shut down, and / or, When a fault occurs in the energy storage structure, it is determined that the drive module (1) is about to shut down.

7. The control method according to claim 5, characterized in that: The method for charging the energy storage module (2) by the energy storage module (2) using the drive module (1) comprises: connecting the capacitor (12) of the drive module (1) to the energy storage module (2), and charging the electric energy generated by the capacitor (12) into the energy storage module (2).

8. The control method according to claim 5, characterized in that: The method for charging the energy storage module (2) by using the drive module (1) comprises: connecting the motor (13) of the drive module (1) to the energy storage module (2), and using the electric energy generated by the rotation of the motor (13) to charge the energy storage module (2).

9. The control method according to claim 5, characterized in that: The method for controlling the energy storage module (2) to be disconnected from the driving module (1) comprises: When the rotation speed of the motor (13) of the driving module (1) is zero, controlling the energy storage module (2) to be disconnected from the driving module (1); and / or, When the fault of the energy storage module (2) is eliminated, controlling the energy storage module (2) to be disconnected from the driving module (1); and / or, When the operating frequency of the refrigeration system including the energy storage structure is greater than the set shutdown frequency, the energy storage module (2) is controlled to be disconnected from the drive module (1).

10. The control method according to claim 5, characterized in that: The control method comprises: It is determined whether the driving module (1) needs to be powered, and when the driving module (1) needs to be powered, the energy storage module (2) is connected to the control module (3), and the energy storage module (2) is controlled to provide electrical energy to the control module (3).

11. The control method according to claim 10, characterized in that: The method for determining whether the driving module (1) needs power supply comprises: Determining whether the motor and / or compressor (5) of the energy storage structure needs to be started; If the motor and / or compressor (5) of the energy storage structure needs to be started, the energy storage module (2) is controlled to provide electrical energy to the control module (3).

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