Air conditioning unit and operation control method and device thereof

Abstract

The invention provides an air conditioning unit and an operation control method and device thereof, and the control method comprises the following steps: starting a corresponding module unit in the air conditioning unit, and enabling the frequency of a compressor to be within a preset efficient frequency band; in response to the situation that the current load of the air conditioning unit does not match the load demand, the frequency of the started compressor is adjusted until the load demand is matched, and the frequency of the compressor is kept within the efficient frequency band all the time; judging whether the adjusted frequency of the compressor meets a resonance triggering condition or not; and if yes, the frequency of the compressor is adjusted again in the efficient frequency band till the frequency of the compressor does not meet the resonance triggering condition. On the basis of the technical scheme, on the premise that it is guaranteed that the unit operates within the efficient frequency band to achieve energy saving, the frequency of the unit compressor is further controlled, the frequency of the unit compressor is made to avoid frequency multiplication values of other components of the unit, and therefore the problems of noise and structural stability caused by resonance are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioning unit and an operation control method and a control device thereof. Background Art

[0002] In recent years, variable frequency speed regulation technology has gradually become mature, promoting energy-saving regulation of central air-conditioning systems, and can change the low efficiency and high consumption of traditional central air-conditioning, but its regulation means are still imperfect. For example, when multiple variable frequency air-conditioning units are operated in modular combination, the conventional compressor control method is that a single unit adjusts the compressor start and stop and frequency increase and decrease according to the load, lacking the concept of overall regulation of the modular system. It often happens that the compressor frequency of a single unit runs to the highest while other units have just started or run to a very low efficiency frequency point, resulting in low energy efficiency and serious energy consumption of the overall system after modular combination.

[0003] In addition, more importantly, the current compressor frequency adjustment scheme for air-conditioning units does not pay attention to the resonance noise problem caused by compressor frequency adjustment. When the compressor frequency is consistent with the frequency of other components in the air-conditioning unit, serious resonance noise will be generated, affecting the user experience. Summary of the invention

[0004] In order to solve the problem of resonance noise existing in the frequency conversion control process of the existing air-conditioning unit, the present invention proposes an air-conditioning unit and an operation control method and a control device thereof.

[0005] In a first aspect, the present invention provides an air conditioning unit operation control method, which comprises the following steps:

[0006] According to the load demand, start the corresponding module unit in the air-conditioning unit, and make the frequency of the compressor of the module unit within the preset high-efficiency frequency band, and make the frequency range of the fan and water pump of the module unit match the high-efficiency frequency band;

[0007] In response to the current load of the air-conditioning unit not matching the load requirement, adjusting the frequency of the compressor of the currently started module unit until it matches the load requirement, and keeping the frequency of the compressor always within the high-efficiency frequency band;

[0008] Determining whether the adjusted frequency of the compressor meets a resonance triggering condition;

[0009] If so, the frequency of the compressor is adjusted again within the high-efficiency frequency band until the frequency of the compressor does not meet the resonance triggering condition.

[0010] In one embodiment, the vibration triggering condition is that the frequency of the compressor is an integer multiple of the frequency of the fan or the water pump.

[0011] In one embodiment, the number of the high-efficiency frequency bands is multiple, and the control method further includes the following steps:

[0012] If the frequency of the compressor exceeds the range of the current high-efficiency frequency band after adjustment, the frequency of the compressor is directly switched to the next high-efficiency frequency band according to the increase or decrease direction of the frequency adjustment of the compressor;

[0013] According to the high-efficiency frequency band after the frequency of the compressor is switched, the frequencies of the fan and the water pump are switched to a frequency range corresponding to the high-efficiency frequency band;

[0014] It is determined whether the frequency of the compressor after switching the high-efficiency frequency band is an integer multiple of the frequency of the fan or the water pump, and if so, the frequency of the compressor is adjusted again.

[0015] In one embodiment, when the frequency of the compressor is directly switched to the next high-efficiency frequency band, the frequency of the compressor is made to correspond to the lower limit value of the high-efficiency frequency band.

[0016] In one embodiment, adjusting the frequency of the compressor again within the high-efficiency frequency band until the frequency of the compressor does not meet the resonance triggering condition comprises the following steps:

[0017] The frequency of the compressor is adjusted within the high-efficiency frequency band with a minimum adjustment amplitude, so that the frequency of the compressor is greater than the frequency of the fan or the water pump and is not equal to an integer multiple of the frequency of the fan or the water pump.

[0018] In one embodiment, adjusting the frequency of the compressor of the currently started module unit until it matches the load demand comprises the following steps:

[0019] The frequency of the compressor of one of the module units is increased or decreased by a preset value each time, and the frequency of the compressor is adjusted successively until the load demand is matched or the total frequency adjustment amplitude reaches an amplitude upper limit;

[0020] When the frequency adjustment amplitude of the compressor of the current module unit reaches the upper limit of the amplitude, the frequency of the compressor of the next module unit is adjusted.

[0021] In one embodiment, the following steps are also included:

[0022] In response to the fact that the frequencies of the compressors of all the started module units have been adjusted, but the current load of the air conditioning unit still does not match the load demand;

[0023] When the current load of the air-conditioning unit does not meet the load requirement, the compressors of all the module units are operated at the highest frequency in the high-efficiency frequency band;

[0024] When the current load of the air-conditioning unit exceeds the load requirement, the module units are shut down one by one.

[0025] In one embodiment, starting a corresponding module unit in an air conditioning unit according to load demand and making the frequency of the compressor of the module unit within a preset high-efficiency frequency band comprises the following steps:

[0026] According to the load demand, starting one of the module units of the air-conditioning unit, and making the frequency of the compressor of the module unit be within the high-efficiency frequency band and not satisfying the resonance triggering condition;

[0027] Determining whether the current load of the air conditioning unit matches the load requirement;

[0028] If the current load of the air conditioning unit does not meet the load requirement, the next module unit is started in sequence;

[0029] If the current load of the air-conditioning unit exceeds the load requirement, the module units are shut down one by one in turn.

[0030] In one embodiment, when starting the module units or increasing the compressor frequency of the module units, the module units with the shorter operation time are given priority;

[0031] When shutting down the module units or reducing the compressor frequency of the module units, the module units with longer operation time will be given priority.

[0032] In one embodiment, when the compressor frequency of the module unit is increased, the compressor with a lower current frequency in each module unit is given priority;

[0033] When reducing the compressor frequency of the modular units, the compressor with a higher current frequency in each modular unit takes priority.

[0034] In a second aspect, the present invention provides an air conditioning unit operation control device, which includes:

[0035] A start control module is used to start the corresponding module unit in the air-conditioning unit according to the load demand, and make the frequency of the compressor of the module unit within a preset high-efficiency frequency band, and make the frequency range of the fan and water pump of the module unit match the high-efficiency frequency band;

[0036] A first frequency control module, which is used to adjust the frequency of the compressor of the currently started module unit until it matches the load demand in response to the current load of the air-conditioning unit not matching the load demand, and keep the frequency of the compressor always within the high-efficiency frequency band;

[0037] a judging module, which is used to judge whether the adjusted frequency of the compressor satisfies a resonance triggering condition; and

[0038] The second frequency control module is used to adjust the frequency of the compressor again within the high-efficiency frequency band until the frequency of the compressor does not meet the resonance triggering condition.

[0039] In the third aspect, the present invention proposes an air-conditioning unit that adopts the above-mentioned control method to control its operation, which includes multiple parallel module units, multiple water pumps of the multiple module units are connected in parallel in the inlet and outlet water pipes, and at least one water inlet pump is connected in series at the water inlet end of the inlet and outlet water pipes.

[0040] The above technical features can be combined in various suitable ways or replaced by equivalent technical features as long as the purpose of the present invention can be achieved.

[0041] The air conditioning unit and its operation control method and control device provided by the present invention have at least the following beneficial effects compared with the prior art:

[0042] An air-conditioning unit and its operation control method and control device of the present invention, under the premise of ensuring that the unit operates within a high-efficiency frequency band to achieve energy saving, further control the frequency of the unit's compressor so that the frequency of the unit's compressor avoids the frequency multiples of other components of the unit to avoid noise caused by resonance and problems with structural stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0044] Figure 1 shows the main flow chart of the control method of the present invention;

[0045] Figure 2 The overall flow chart of the control method of the present invention is shown;

[0046] Figure 3 A structural schematic diagram showing the water inlet and outlet pipes of multiple module units of the air-conditioning unit of the present invention is shown.

[0047] In the drawings, like reference numerals are used for like parts. The drawings are not necessarily to scale. DETAILED DESCRIPTION

[0048] The present invention will be further described below in conjunction with the accompanying drawings.

[0049] Example 1

[0050] An embodiment of the present invention provides an air conditioning unit operation control method, which comprises the following steps:

[0051] Step S100: according to the load demand, start the corresponding module unit in the air conditioning unit, and make the frequency of the compressor of the module unit within the preset high-efficiency frequency band, and make the frequency range of the fan and water pump of the module unit match the high-efficiency frequency band.

[0052] Specifically, the air-conditioning unit has multiple module units. In the operation control method of the present invention, the energy saving of the air-conditioning unit is first considered, that is, when the air-conditioning unit is started and operated according to the load demand, the frequency of the compressor of the corresponding module unit is within the preset high-efficiency frequency band. The high-efficiency frequency band refers to the frequency band in which the compressor has the highest operating efficiency. The specific frequency value range of the high-efficiency frequency band may vary for different compressors, and can be obtained through testing as needed in actual application. Of course, there can actually be multiple preset high-efficiency frequency bands, for example, there is at least one low-frequency high-efficiency frequency band corresponding to the low-frequency range of the compressor, and there is at least one high-frequency high-efficiency frequency band corresponding to the high-frequency range.

[0053] In addition, based on the high-efficiency frequency band of the compressor, the fan and water pump of the modular unit also have corresponding frequency ranges for high-efficiency operation. For example, if the compressor uses [a] Hz to [b] Hz as the low-frequency and high-efficiency frequency band, the frequency range of the fan corresponds to [a1] Hz to [b1] Hz, and the frequency range of the water pump corresponds to [a2] Hz to [b2] Hz; if the compressor uses [c] Hz to [d] Hz as the high-frequency and high-efficiency frequency band, the frequency range of the fan corresponds to [c1] Hz to [d1] Hz, and the frequency range of the water pump corresponds to [c2] Hz to [d2] Hz; where the frequency of the fan mainly refers to the blade frequency of its fan blades, and the calculation formula is N = V*M / 60, where N is the blade frequency of the fan, V is the speed of the fan, and M is the number of blades of the fan blade. It should be noted that the frequency range of the fan and water pump is not necessarily completely consistent with the high-efficiency frequency band of the compressor, but is a frequency range corresponding to the high-efficiency frequency band of the compressor obtained based on the operating efficiency of the fan and water pump itself combined with the frequency of the compressor.

[0054] Step S200: In response to the current load of the air-conditioning unit not matching the load demand, the frequency of the compressor of the currently started module unit is adjusted until it matches the load demand, and the frequency of the compressor is always kept within the high-efficiency frequency band.

[0055] Specifically, when the module unit is started, the current load of the air-conditioning unit may not match the load demand, may not meet the load demand, or may exceed the load demand. At this time, the load demand is matched by adjusting the frequency of the compressor of the started module unit through variable frequency control. At the same time, when adjusting the frequency of the compressor, it is necessary to ensure that the frequency of the compressor is always within the high-efficiency frequency band.

[0056] Step S300: determining whether the adjusted frequency of the compressor satisfies a resonance triggering condition, wherein the resonance triggering condition is that the frequency of the compressor is an integer multiple of the frequency of the fan or the water pump.

[0057] Specifically, after adjusting the frequency of the compressor, it is necessary to consider whether the frequency of the compressor will cause resonance of the module unit and cause noise problems. Specifically, it is necessary to consider whether the frequency of the compressor is an integer multiple of the frequency of the fan or the water pump. For example, assuming that the frequency of the fan output is 40Hz (600r / h), the corresponding number of fan blades is 3, the fan blade frequency is 30Hz, and the water pump frequency is 40Hz; then the frequency of the compressor should avoid 30Hz, 40Hz, 60Hz, 80Hz, etc., that is, it is necessary to avoid integer multiples of 30Hz and 40Hz.

[0058] Step 400: If yes, the frequency of the compressor is adjusted again within the high-efficiency frequency band until the frequency of the compressor does not meet the resonance triggering condition.

[0059] Specifically, the logic for adjusting the frequency of the compressor is to first adjust the frequency of the compressor to a corresponding value based on the load demand. If after the adjustment, the frequency of the compressor is an integer multiple of the frequency of the fan or water pump, it means that the resonance triggering conditions are met and a resonance problem will occur. At this time, the frequency of the compressor is further adjusted within the high-efficiency frequency band to avoid the corresponding integer multiple value, thereby avoiding the noise generated by the resonance and the impact of the resonance on the structural stability of the unit.

[0060] Step 410: Adjust the frequency of the compressor within the high-efficiency frequency band with a minimum adjustment amplitude, so that the frequency of the compressor is greater than the frequency of the fan or the water pump and avoids integer multiples of the frequency of the fan or the water pump.

[0061] Specifically, when adjusting the frequency of the compressor based on resonance control, it is preferably adjusted with the minimum adjustment amplitude, so that the frequency of the compressor changes within a small range, avoiding large-scale fluctuations in frequency causing large-scale changes in the unit load and deviating from the actual load demand to a large extent. For example, if the minimum adjustment amplitude allowed by the compressor is 1Hz, then when adjusting the frequency of the compressor based on resonance control, it is adjusted at 1Hz to avoid large changes in frequency, so that the load of the unit is as close to the actual load demand as possible.

[0062] In addition, when adjusting the frequency of the compressor based on resonance control, it is preferred that the load of the unit is not less than the actual load demand to meet the needs of users. Therefore, when adjusting the frequency of the compressor, the frequency of the compressor should be greater than the actual frequency of the fan or water pump while avoiding the multiple value of the frequency of the fan or water pump. This can not only avoid resonance but also meet the load demand. Adjusting the frequency of the compressor with the minimum adjustment range can also ensure that even if the load of the unit exceeds the actual load demand, the degree of excess is limited, and energy saving can be guaranteed to a certain extent.

[0063] Furthermore, the number of efficient frequency bands is multiple, and the control method further includes the following steps:

[0064] Step S001: if the frequency of the compressor exceeds the range of the current high-efficiency frequency band after adjustment, the frequency of the compressor is directly switched to the next high-efficiency frequency band according to the increase or decrease direction of the compressor frequency adjustment;

[0065] Step S002: according to the high-efficiency frequency band after the frequency of the compressor is switched, the frequencies of the fan and the water pump are switched to a frequency range corresponding to the high-efficiency frequency band;

[0066] Step S003: Determine whether the frequency of the compressor after switching to the high-efficiency frequency band is an integer multiple of the frequency of the fan or the water pump, and adjust the frequency of the compressor again if it is an integer multiple.

[0067] Specifically, there are multiple high-efficiency frequency bands, including at least one low-frequency high-efficiency frequency band and one high-frequency high-efficiency frequency band. When adjusting the frequency of the compressor, including adjusting the frequency of the compressor based on the load demand and adjusting the frequency of the compressor based on resonance control, if the frequency of the adjusted compressor exceeds the range of the current high-efficiency frequency band, the frequency of the compressor is directly switched to the next high-efficiency frequency band according to the direction of increase or decrease. For example, the current adjustment of the compressor frequency is to increase the frequency. If the frequency exceeds the current high-efficiency frequency band after the frequency is increased, then the frequency of the compressor is directly switched to the next relatively high-frequency high-efficiency frequency band in the direction of frequency increase. After the high-efficiency frequency band of the compressor is switched, the frequencies of the fan and the water pump are synchronously switched to the frequency range corresponding to the switched high-efficiency frequency band. Then, after the frequency of the compressor switches to the high-efficiency frequency band, according to the frequency value after the compressor is switched, it is judged again whether it is an integer multiple relationship with the frequency of the fan or the water pump.

[0068] Preferably, in step S001, when the frequency of the compressor is directly switched to the next high-efficiency frequency band, the frequency of the compressor is made to correspond to the lower limit value of the high-efficiency frequency band.

[0069] Specifically, the specific value of the compressor frequency corresponds to the lower limit value of the high-efficiency frequency band after switching to the high-efficiency frequency band, that is, the compressor is kept running at a relatively low frequency in the high-efficiency frequency band, thereby further achieving energy saving. For example, if the high-efficiency frequency band after switching is [a] Hz to [b] Hz, the specific value of the compressor frequency is preferentially adjusted to [a] Hz.

[0070] Further, in step S200, the frequency of the compressor of the currently started module unit is adjusted until it matches the load demand, including the following steps:

[0071] Step S210: The frequency of the compressor of one of the module units is increased or decreased by a preset value each time, and the frequency of the compressor is adjusted successively until the load demand is matched or the total frequency adjustment amplitude reaches the amplitude upper limit.

[0072] Step S220: When the frequency adjustment amplitude of the compressor of the current module unit reaches the amplitude upper limit, switch to adjusting the frequency of the compressor of the next module unit.

[0073] Specifically, when adjusting the frequency of the compressor of a modular unit to match the load demand, a single modular unit is adjusted one by one, that is, the frequency of the compressor of a modular unit is adjusted first, and the preset value is adjusted (increased or decreased) each time. In this embodiment, it is preferably adjusted by 1Hz each time to avoid a large-scale change in frequency at one time, which causes a large fluctuation in the load of the unit. When the frequency of the compressor of a modular unit is adjusted to match the load demand, or when the frequency adjustment amplitude of the compressor of a modular unit reaches the amplitude upper limit, switch to adjusting the next modular unit. For example, in this embodiment, the amplitude upper limit is set to 5Hz (i.e., FIG. Figure 2 The cumulative judgment value of the compressor frequency in is 5Hz), and the preset value for each adjustment is 1Hz; if the compressor frequency is adjusted successively within the range of not exceeding 5Hz to match the load demand, the unit is maintained in operation after adjustment; if the compressor frequency is adjusted successively within the range of 5Hz and cannot match the load demand, then switch to adjusting the frequency of the compressor of the next module unit.

[0074] Preferably, in step S200, in the process of adjusting the frequency of the compressor of the currently started modular unit, in order to ensure the balanced operation of each modular unit, when the compressor frequency of the modular unit is increased, the compressor with a lower current frequency in each modular unit is given priority; when the compressor frequency of the modular unit is reduced, the compressor with a higher current frequency in each modular unit is given priority.

[0075] Further preferably, in order to ensure the balanced operation of each compressor, when the compressor frequency of the modular unit is increased, the compressor with a lower current frequency in each modular unit is given priority; when the compressor frequency of the modular unit is reduced, the compressor with a higher current frequency in each modular unit is given priority.

[0076] Furthermore, step S220 further includes the following steps:

[0077] Step S221: In response to the fact that the frequencies of the compressors of all activated module units have been adjusted, but the current load of the air-conditioning unit still does not match the load demand.

[0078] Step S222: when the current load of the air-conditioning unit does not meet the load requirement, the compressors of all the module units are operated at the highest frequency in the high-efficiency frequency band.

[0079] Step S223: When the current load of the air-conditioning unit exceeds the load requirement, shut down the module units one by one.

[0080] Specifically, when the frequency of the compressor is adjusted based on the load demand, if each module unit that has been started has undergone frequency adjustment of the compressor, but the current load of the air-conditioning unit still does not match the load demand, the operation of the module unit is further controlled according to the specific situation of the mismatch.

[0081] If the current load of the air-conditioning unit does not meet the load requirement, the compressors of all module units are operated at the highest frequency in the high-efficiency frequency band. For example, in the case of multiple high-efficiency frequency bands, the frequency of the compressor is switched to the highest frequency of the high-frequency high-efficiency frequency band with the highest relative frequency level. After switching, resonance control still needs to be performed according to the same steps as above. If the current load of the air-conditioning unit exceeds the load requirement, the module units are shut down one by one, one module unit at a time, until the load of the air-conditioning unit matches the load requirement.

[0082] Furthermore, in step S223, according to the load demand, at least one module unit must be in operation; at the same time, in the process of shutting down the module unit, it is preferably possible to further combine the frequency reduction of the compressor to further approach and match the load demand.

[0083] Example 2

[0084] An embodiment of the present invention provides an air conditioning unit operation control method, which comprises the following steps:

[0085] Step S100: according to the load demand, start the corresponding module unit in the air conditioning unit, and make the frequency of the compressor of the module unit within the preset high-efficiency frequency band, and make the frequency range of the fan and water pump of the module unit match the high-efficiency frequency band.

[0086] Specifically, the air-conditioning unit has multiple module units. In the operation control method of the present invention, the energy saving of the air-conditioning unit is first considered, that is, when the air-conditioning unit is started and operated according to the load demand, the frequency of the compressor of the corresponding module unit is within the preset high-efficiency frequency band. The high-efficiency frequency band refers to the frequency band in which the compressor has the highest operating efficiency. The specific frequency value range of the high-efficiency frequency band may vary for different compressors, and can be obtained through testing as needed in actual application. Of course, there can actually be multiple preset high-efficiency frequency bands, for example, there is at least one low-frequency high-efficiency frequency band corresponding to the low-frequency range of the compressor, and there is at least one high-frequency high-efficiency frequency band corresponding to the high-frequency range.

[0087] In addition, based on the high-efficiency frequency band of the compressor, the fan and water pump of the modular unit also have corresponding frequency ranges for high-efficiency operation. For example, if the compressor uses [a] Hz to [b] Hz as the low-frequency and high-efficiency frequency band, the frequency range of the fan corresponds to [a1] Hz to [b1] Hz, and the frequency range of the water pump corresponds to [a2] Hz to [b2] Hz; if the compressor uses [c] Hz to [d] Hz as the high-frequency and high-efficiency frequency band, the frequency range of the fan corresponds to [c1] Hz to [d1] Hz, and the frequency range of the water pump corresponds to [c2] Hz to [d2] Hz; where the frequency of the fan mainly refers to the blade frequency of its fan blades, and the calculation formula is N = V*M / 60, where N is the blade frequency of the fan, V is the speed of the fan, and M is the number of blades of the fan blade. It should be noted that the frequency range of the fan and water pump is not necessarily completely consistent with the high-efficiency frequency band of the compressor, but is a frequency range corresponding to the high-efficiency frequency band of the compressor obtained based on the operating efficiency of the fan and water pump itself combined with the frequency of the compressor.

[0088] Step S200: In response to the current load of the air-conditioning unit not matching the load demand, the frequency of the compressor of the currently started module unit is adjusted until it matches the load demand, and the frequency of the compressor is always kept within the high-efficiency frequency band.

[0089] Specifically, when the module unit is started, the current load of the air-conditioning unit may not match the load demand, may not meet the load demand, or may exceed the load demand. At this time, the load demand is matched by adjusting the frequency of the compressor of the started module unit through variable frequency control. At the same time, when adjusting the frequency of the compressor, it is necessary to ensure that the frequency of the compressor is always within the high-efficiency frequency band.

[0090] Step S300: determining whether the adjusted frequency of the compressor satisfies a resonance triggering condition, wherein the resonance triggering condition is that the frequency of the compressor is an integer multiple of the frequency of the fan or the water pump.

[0091] Specifically, after adjusting the frequency of the compressor, it is necessary to consider whether the frequency of the compressor will cause resonance of the module unit and cause noise problems. Specifically, it is necessary to consider whether the frequency of the compressor is an integer multiple of the frequency of the fan or the water pump. For example, assuming that the frequency of the fan output is 40Hz (600r / h), the corresponding number of fan blades is 3, the fan blade frequency is 30Hz, and the water pump frequency is 40Hz; then the frequency of the compressor should avoid 30Hz, 40Hz, 60Hz, 80Hz, etc., that is, it is necessary to avoid integer multiples of 30Hz and 40Hz.

[0092] Step 400: If yes, the frequency of the compressor is adjusted again within the high-efficiency frequency band until the frequency of the compressor does not meet the resonance triggering condition.

[0093] Specifically, the logic for adjusting the frequency of the compressor is to first adjust the frequency of the compressor to a corresponding value based on the load demand. If after the adjustment, the frequency of the compressor is an integer multiple of the frequency of the fan or water pump, it means that the resonance triggering conditions are met and a resonance problem will occur. At this time, the frequency of the compressor is further adjusted within the high-efficiency frequency band to avoid the corresponding integer multiple value, thereby avoiding the noise generated by the resonance and the impact of the resonance on the structural stability of the unit.

[0094] Step 410: Adjust the frequency of the compressor within the high-efficiency frequency band with a minimum adjustment amplitude, so that the frequency of the compressor is greater than the frequency of the fan or the water pump and avoids integer multiples of the frequency of the fan or the water pump.

[0095] Specifically, when adjusting the frequency of the compressor based on resonance control, it is preferably adjusted with the minimum adjustment amplitude, so that the frequency of the compressor changes within a small range, avoiding large-scale fluctuations in frequency causing large-scale changes in the unit load and deviating from the actual load demand to a large extent. For example, if the minimum adjustment amplitude allowed by the compressor is 1Hz, then when adjusting the frequency of the compressor based on resonance control, it is adjusted at 1Hz to avoid large changes in frequency, so that the load of the unit is as close to the actual load demand as possible.

[0096] In addition, when adjusting the frequency of the compressor based on resonance control, it is preferred that the load of the unit is not less than the actual load demand to meet the needs of users. Therefore, when adjusting the frequency of the compressor, the frequency of the compressor should be greater than the actual frequency of the fan or water pump while avoiding the multiple value of the frequency of the fan or water pump. This can not only avoid resonance but also meet the load demand. Adjusting the frequency of the compressor with the minimum adjustment range can also ensure that even if the load of the unit exceeds the actual load demand, the degree of excess is limited, and energy saving can be guaranteed to a certain extent.

[0097] Furthermore, the number of efficient frequency bands is multiple, and the control method further includes the following steps:

[0098] Step S001: if the frequency of the compressor exceeds the range of the current high-efficiency frequency band after adjustment, the frequency of the compressor is directly switched to the next high-efficiency frequency band according to the increase or decrease direction of the compressor frequency adjustment;

[0099] Step S002: according to the high-efficiency frequency band after the frequency of the compressor is switched, the frequencies of the fan and the water pump are switched to a frequency range corresponding to the high-efficiency frequency band;

[0100] Step S003: Determine whether the frequency of the compressor after switching to the high-efficiency frequency band is an integer multiple of the frequency of the fan or the water pump, and adjust the frequency of the compressor again if it is an integer multiple.

[0101] Specifically, there are multiple high-efficiency frequency bands, including at least one low-frequency high-efficiency frequency band and one high-frequency high-efficiency frequency band. When adjusting the frequency of the compressor, including adjusting the frequency of the compressor based on the load demand and adjusting the frequency of the compressor based on resonance control, if the frequency of the adjusted compressor exceeds the range of the current high-efficiency frequency band, the frequency of the compressor is directly switched to the next high-efficiency frequency band according to the direction of increase or decrease. For example, the current adjustment of the compressor frequency is to increase the frequency. If the frequency exceeds the current high-efficiency frequency band after the frequency is increased, then the frequency of the compressor is directly switched to the next relatively high-frequency high-efficiency frequency band in the direction of frequency increase. After the high-efficiency frequency band of the compressor is switched, the frequencies of the fan and the water pump are synchronously switched to the frequency range corresponding to the switched high-efficiency frequency band. Then, after the frequency of the compressor switches to the high-efficiency frequency band, according to the frequency value after the compressor is switched, it is judged again whether it is an integer multiple relationship with the frequency of the fan or the water pump.

[0102] Preferably, in step S001, when the frequency of the compressor is directly switched to the next high-efficiency frequency band, the frequency of the compressor is made to correspond to the lower limit value of the high-efficiency frequency band.

[0103] Specifically, the specific value of the compressor frequency corresponds to the lower limit value of the high-efficiency frequency band after switching to the high-efficiency frequency band, that is, the compressor is kept running at a relatively low frequency in the high-efficiency frequency band, thereby further achieving energy saving. For example, if the high-efficiency frequency band after switching is [a] Hz to [b] Hz, the specific value of the compressor frequency is preferentially adjusted to [a] Hz.

[0104] Further, in step S200, the frequency of the compressor of the currently started module unit is adjusted until it matches the load demand, including the following steps:

[0105] Step S210: The frequency of the compressor of one of the module units is increased or decreased by a preset value each time, and the frequency of the compressor is adjusted successively until the load demand is matched or the total frequency adjustment amplitude reaches the amplitude upper limit.

[0106] Step S220: When the frequency adjustment amplitude of the compressor of the current module unit reaches the amplitude upper limit, switch to adjusting the frequency of the compressor of the next module unit.

[0107] Specifically, when adjusting the frequency of the compressor of a modular unit to match the load demand, a single modular unit is adjusted one by one, that is, the frequency of the compressor of a modular unit is adjusted first, and the preset value is adjusted (increased or decreased) each time. In this embodiment, it is preferably adjusted by 1Hz each time to avoid a large-scale change in frequency at one time, which causes a large fluctuation in the load of the unit. When the frequency of the compressor of a modular unit is adjusted to match the load demand, or when the frequency adjustment amplitude of the compressor of a modular unit reaches the amplitude upper limit, switch to adjusting the next modular unit. For example, in this embodiment, the amplitude upper limit is set to 5Hz (i.e., FIG. Figure 2 The cumulative judgment value of the compressor frequency in is 5Hz), and the preset value for each adjustment is 1Hz; if the compressor frequency is adjusted successively within the range of not exceeding 5Hz to match the load demand, the unit is maintained in operation after adjustment; if the compressor frequency is adjusted successively within the range of 5Hz and cannot match the load demand, then switch to adjusting the frequency of the compressor of the next module unit.

[0108] Preferably, in step S200, in the process of adjusting the frequency of the compressor of the currently started modular unit, in order to ensure the balanced operation of each modular unit, when the compressor frequency of the modular unit is increased, the compressor with a lower current frequency in each modular unit is given priority; when the compressor frequency of the modular unit is reduced, the compressor with a higher current frequency in each modular unit is given priority.

[0109] Further preferably, in order to ensure the balanced operation of each compressor, when the compressor frequency of the modular unit is increased, the compressor with a lower current frequency in each modular unit is given priority; when the compressor frequency of the modular unit is reduced, the compressor with a higher current frequency in each modular unit is given priority.

[0110] Furthermore, step S220 further includes the following steps:

[0111] Step S221: In response to the fact that the frequencies of the compressors of all activated module units have been adjusted, but the current load of the air-conditioning unit still does not match the load demand.

[0112] Step S222: when the current load of the air-conditioning unit does not meet the load requirement, the compressors of all the module units are operated at the highest frequency in the high-efficiency frequency band.

[0113] Step S223: When the current load of the air-conditioning unit exceeds the load requirement, shut down the module units one by one.

[0114] Specifically, when the frequency of the compressor is adjusted based on the load demand, if each module unit that has been started has undergone frequency adjustment of the compressor, but the current load of the air-conditioning unit still does not match the load demand, the operation of the module unit is further controlled according to the specific situation of the mismatch.

[0115] If the current load of the air-conditioning unit does not meet the load requirement, the compressors of all module units are operated at the highest frequency in the high-efficiency frequency band. For example, in the case of multiple high-efficiency frequency bands, the frequency of the compressor is switched to the highest frequency of the high-frequency high-efficiency frequency band with the highest relative frequency level. After switching, resonance control still needs to be performed according to the same steps as above. If the current load of the air-conditioning unit exceeds the load requirement, the module units are shut down one by one, one module unit at a time, until the load of the air-conditioning unit matches the load requirement.

[0116] Furthermore, in step S223, according to the load demand, at least one module unit must be in operation; at the same time, in the process of shutting down the module unit, it is preferably possible to further combine the frequency reduction of the compressor to further approach and match the load demand.

[0117] Furthermore, in step S100, according to the load demand, the corresponding module unit in the air-conditioning unit is started, and the frequency of the compressor of the module unit is set within a preset high-efficiency frequency band, including the following steps:

[0118] Step S110: according to the load demand, one of the module units of the air-conditioning unit is started, and the frequency of the compressor of the module unit is within the high-efficiency frequency band and does not meet the resonance triggering condition.

[0119] Step S120: Determine whether the current load of the air-conditioning unit matches the load demand.

[0120] Step S130: If the current load of the air-conditioning unit does not meet the load requirement, the next module unit is started in sequence.

[0121] Step S140: If the current load of the air-conditioning unit exceeds the load requirement, shut down one module unit at a time.

[0122] Specifically, when starting the air conditioning unit, the module units are started one by one, that is, one of the module units is started first, so that the compressor of the module unit runs at an initial frequency. In this embodiment, the initial frequency is set to be in a low-frequency and high-efficiency frequency band, and avoids multiple values ​​of the frequency of the fan or the water pump. The fan and the water pump also have a preset initial frequency accordingly. According to the size of the load demand, after starting a module unit, the load of the air conditioning unit is matched with the load demand by gradually opening a module unit or gradually closing a module unit.

[0123] In this embodiment, the above steps S110 to S140 are to match the load demand by starting or shutting down the module unit. If the method of steps S110 to S140 cannot achieve the matching of the load demand, the compressor frequency control process can be further entered to further match the load demand through frequency control.

[0124] Example 3

[0125] An embodiment of the present invention provides an air conditioning unit operation control device, which includes:

[0126] A start control module is used to start the corresponding module unit in the air conditioning unit according to the load demand, and make the frequency of the compressor of the module unit within the preset high-efficiency frequency band, and make the frequency range of the fan and water pump of the module unit match the high-efficiency frequency band;

[0127] A first frequency control module, which is used to adjust the frequency of the compressor of the currently started module unit until it matches the load demand in response to the current load of the air-conditioning unit not matching the load demand, and keep the frequency of the compressor always within the high-efficiency frequency band;

[0128] a judging module, which is used to judge whether the adjusted frequency of the compressor satisfies a resonance triggering condition; and

[0129] The second frequency control module is used to adjust the frequency of the compressor again within the high-efficiency frequency band until the frequency of the compressor does not meet the resonance triggering condition.

[0130] Example 4

[0131] The embodiment of the present invention provides an air conditioning unit controlled by the control method of the above embodiment, which comprises a plurality of module units connected in parallel, a plurality of water pumps of the plurality of module units connected in parallel in the inlet and outlet water pipelines, and at least one water inlet pump connected in series at the water inlet end of the inlet and outlet water pipelines, as shown in the accompanying drawings Figure 3 The purpose of the series-parallel pipeline design of the water pump of the modular unit is that in the series-parallel pipeline, the flow rate of a single water pump will decrease and the head will decrease. If the pipe network resistance is large, it will affect the hydraulic head of the air-conditioning unit. Therefore, in this embodiment, at least one water inlet pump is connected in series at the water inlet end of the series-parallel inlet and outlet water pipelines to increase flow control and improve hydraulic head.

[0132] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0133] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. An air conditioning unit operation control method, characterized in that: The following steps are involved: According to the load demand, start the corresponding module unit in the air-conditioning unit, and make the frequency of the compressor of the module unit within the preset high-efficiency frequency band, and make the frequency range of the fan and water pump of the module unit match the high-efficiency frequency band; In response to the current load of the air-conditioning unit not matching the load requirement, adjusting the frequency of the compressor of the currently started module unit until it matches the load requirement, and keeping the frequency of the compressor always within the high-efficiency frequency band; Determining whether the adjusted frequency of the compressor meets a resonance triggering condition; If so, the frequency of the compressor is adjusted again within the high-efficiency frequency band until the frequency of the compressor does not meet the resonance triggering condition.

2. The air conditioning unit operation control method according to claim 1, characterized in that: The vibration triggering condition is that the frequency of the compressor is an integer multiple of the frequency of the fan or the water pump.

3. The air conditioning unit operation control method according to claim 2, characterized in that: The number of the high-efficiency frequency bands is multiple, and the control method further includes the following steps: If the frequency of the compressor exceeds the range of the current high-efficiency frequency band after adjustment, the frequency of the compressor is directly switched to the next high-efficiency frequency band according to the increase or decrease direction of the frequency adjustment of the compressor; According to the high-efficiency frequency band after the frequency of the compressor is switched, the frequencies of the fan and the water pump are switched to a frequency range corresponding to the high-efficiency frequency band; It is determined whether the frequency of the compressor after switching the high-efficiency frequency band is an integer multiple of the frequency of the fan or the water pump, and if so, the frequency of the compressor is adjusted again.

4. The air conditioning unit operation control method according to claim 3, characterized in that: When the frequency of the compressor is directly switched to the next high-efficiency frequency band, the frequency of the compressor is made to correspond to the lower limit value of the high-efficiency frequency band.

5. The air conditioning unit operation control method according to claim 2, characterized in that: Adjusting the frequency of the compressor again within the high-efficiency frequency band until the frequency of the compressor does not meet the resonance triggering condition comprises the following steps: The frequency of the compressor is adjusted within the high-efficiency frequency band with a minimum adjustment amplitude, so that the frequency of the compressor is greater than the frequency of the fan or the water pump and is not equal to an integer multiple of the frequency of the fan or the water pump.

6. The air conditioning unit operation control method according to any one of claims 1 to 5, characterized in that: Adjusting the frequency of the compressor of the currently started module unit until it matches the load demand comprises the following steps: The frequency of the compressor of one of the module units is increased or decreased by a preset value each time, and the frequency of the compressor is adjusted successively until the load demand is matched or the total frequency adjustment amplitude reaches an amplitude upper limit; When the frequency adjustment amplitude of the compressor of the current module unit reaches the upper limit of the amplitude, the frequency of the compressor of the next module unit is adjusted.

7. The air conditioning unit operation control method according to claim 6, characterized in that: The following steps are also included: In response to the fact that the frequencies of the compressors of all the started module units have been adjusted, but the current load of the air conditioning unit still does not match the load demand; When the current load of the air-conditioning unit does not meet the load requirement, the compressors of all the module units are operated at the highest frequency in the high-efficiency frequency band; When the current load of the air-conditioning unit exceeds the load requirement, the module units are shut down one by one.

8. The air conditioning unit operation control method according to claim 1, characterized in that: According to the load demand, the corresponding module unit in the air-conditioning unit is started, and the frequency of the compressor of the module unit is within the preset high-efficiency frequency band, including the following steps: According to the load demand, starting one of the module units of the air-conditioning unit, and making the frequency of the compressor of the module unit be within the high-efficiency frequency band and not satisfying the resonance triggering condition; Determining whether the current load of the air conditioning unit matches the load requirement; If the current load of the air conditioning unit does not meet the load requirement, the next module unit is started in sequence; If the current load of the air-conditioning unit exceeds the load requirement, the module units are shut down one by one in turn.

9. The air conditioning unit operation control method according to claim 1, characterized in that: When starting the module units or increasing the compressor frequency of the module units, the module units with the shorter running time are given priority; When shutting down the module units or reducing the compressor frequency of the module units, the module units with longer operation time will be given priority.

10. The air conditioning unit operation control method according to claim 1, characterized in that: When increasing the compressor frequency of the module unit, the compressor with a lower current frequency in each module unit is given priority; When reducing the compressor frequency of the modular units, the compressor with a higher current frequency in each modular unit takes priority.

11. An air conditioning unit operation control device, characterized in that: include: A start control module is used to start the corresponding module unit in the air-conditioning unit according to the load demand, and make the frequency of the compressor of the module unit within a preset high-efficiency frequency band, and make the frequency range of the fan and water pump of the module unit match the high-efficiency frequency band; A first frequency control module, which is used to adjust the frequency of the compressor of the currently started module unit until it matches the load demand in response to the current load of the air-conditioning unit not matching the load demand, and keep the frequency of the compressor always within the high-efficiency frequency band; A judging module, used for judging whether the adjusted frequency of the compressor satisfies a resonance triggering condition; as well as The second frequency control module is used to adjust the frequency of the compressor again within the high-efficiency frequency band until the frequency of the compressor does not meet the resonance triggering condition.

12. An air conditioning unit controlled by the control method according to any one of claims 1 to 10, characterized in that: It comprises a plurality of parallel module units, a plurality of water pumps of the plurality of module units are connected in parallel in an inlet and outlet water pipeline, and at least one inlet water pump is connected in series at the water inlet end of the inlet and outlet water pipeline.

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