Dual-pump control system and method thereof

Abstract

A dual-pump control system and a method thereof, the dual-pump control system is suitable for connecting and controlling a first pump and a second pump mounted on a pipeline, the pipeline is also provided with a pressure barrel, the dual-pump control system comprises a first control unit, a second control unit and two pressure sensors. The first control unit can execute a first mode and a second mode, the second control unit can execute a third mode and a fourth mode, the first control unit and the second control unit are set to start executing from the first mode and the fourth mode respectively, and the modes are switched along with the operation process. Therefore, the first control unit and the second control unit can switch the priority starting sequence without communication, the situation that the utilization rate of a single pump is much larger than that of another pump is avoided, and the service life of the pump is prolonged.

Description

Technical Field

[0001] The present invention relates to a dual - pump control system and its method, in particular to a dual - pump control system and its method for controlling the coordinated operation between multiple pumps. Background Art

[0002] Generally, for the operation of multiple pumps, one pump is set as the main pump and the rest are set as auxiliary pumps. When the water pressure is insufficient, the main pump will start preferentially. If the water demand is high and the pressurizing capacity of the main pump cannot cope, the water pressure will continue to drop, and then the auxiliary pump will start successively. This operation method can effectively solve the problem of insufficient water pressure, but the disadvantage is that the usage frequency of the main pump will be higher than that of the auxiliary pump, resulting in a decrease in the service life of the main pump.

[0003] To solve the above - mentioned disadvantages, it is possible to control the operation between multiple pumps through a control center or for the pumps to communicate with each other, both of which can achieve adjusting the start sequence of each pump and improving the service life of the pumps. However, the disadvantage of this method is that an additional communication module needs to be installed on the pumps. In addition to having to consider the communication quality, it will also increase the cost. Summary of the Invention

[0004] The purpose of the present invention is to provide a dual - pump control system in which two pumps can coordinate their operations without communication.

[0005] The dual - pump control system of the present invention is suitable for connecting and controlling a first pump and a second pump installed in a pipeline. The pipeline is also provided with a pressure tank for temporarily storing the liquid pressurized by the first pump and the second pump. The dual - pump control system includes a first control unit, a second control unit, and two pressure sensors. The first control unit is suitable for being electrically connected to the first pump and controlling the operation of the first pump, and can execute in a first mode and a second mode. The second control unit is suitable for being electrically connected to the second pump and controlling the operation of the second pump, and can execute in a third mode and a fourth mode. The two pressure sensors are respectively electrically connected to the first control unit and the second control unit. The pressure sensors detect the water pressure in the pipeline and transmit a detected pressure value to the corresponding first control unit and second control unit.

[0006] The first control unit and the second control unit are respectively set to start execution from the first mode and the fourth mode, or from the second mode and the third mode.

[0007] In the first mode, the first control unit controls the first pump to standby and determines whether the detected pressure value is less than a first critical pressure value.

[0008] When the first control unit determines that the detected pressure value is less than the first critical pressure value, the first control unit controls the first pump to start and determines whether the first shutdown condition is met.

[0009] When the first control unit determines that the first shutdown condition is met, the first control unit switches to the second mode.

[0010] In the second mode, the first control unit controls the first pump to standby and determines whether the detected pressure value is less than the second critical pressure value.

[0011] When the first control unit determines that the detected pressure value is less than the second critical pressure value, the first control unit determines whether the first start condition related to water pressure or time is met.

[0012] When the first control unit determines that the first start condition is met, the first control unit controls the first pump to start and determines whether the second shutdown condition is met.

[0013] When the first control unit determines that the second shutdown condition is met, the first control unit switches to the first mode.

[0014] In the third mode, the second control unit controls the second pump to standby and determines whether the detected pressure value is less than the sixth critical pressure value.

[0015] When the second control unit determines that the detected pressure value is less than the sixth critical pressure value, the second control unit controls the second pump to start and determines whether the third shutdown condition is met.

[0016] When the second control unit determines that the third shutdown condition is met, the second control unit switches to the fourth mode.

[0017] In the fourth mode, the second control unit controls the second pump to standby and determines whether the detected pressure value is less than the seventh critical pressure value.

[0018] When the second control unit determines that the detected pressure value is less than the seventh critical pressure value, the second control unit determines whether the second start condition related to water pressure or time is met.

[0019] When the second control unit determines that the second start condition is met, the second control unit controls the second pump to start and determines whether the fourth shutdown condition is met.

[0020] When the second control unit determines that the fourth shutdown condition is met, the second control unit switches to the third mode.

[0021] In some embodiments, when the first control unit determines whether the first start condition is satisfied, the first control unit starts timing to generate a first timing record and determines whether the first timing record is greater than a first time threshold value.

[0022] When the first control unit determines that the first timing record is greater than the first time threshold value, the first control unit controls the first pump to start and determines whether the second stop condition is satisfied.

[0023] Wherein, when the second control unit determines whether the second start condition is satisfied, the second control unit starts timing to generate a second timing record and determines whether the second timing record is greater than a second time threshold value.

[0024] When the second control unit determines that the second timing record is greater than the second time threshold value, the second control unit controls the second pump to start and determines whether the fourth stop condition is satisfied.

[0025] In some embodiments, when the first control unit determines that the first timing record is not greater than the first time threshold value, the first control unit determines whether the detected pressure value is greater than a third critical pressure value, wherein the third critical pressure value is greater than or equal to the second critical pressure value.

[0026] When the first control unit determines that the detected pressure value is greater than the third critical pressure value, the first control unit determines whether the detected pressure value is greater than a fourth critical pressure value, wherein the fourth critical pressure value is greater than the third critical pressure value.

[0027] When the first control unit determines that the detected pressure value is greater than the fourth critical pressure value, the first control unit switches to the first mode.

[0028] When the first control unit determines that the detected pressure value is not greater than the fourth critical pressure value, the first control unit determines again whether the detected pressure value is less than the second critical pressure value.

[0029] Wherein, when the second control unit determines that the second timing record is not greater than the second time threshold value, the second control unit determines whether the detected pressure value is greater than an eighth critical pressure value, wherein the eighth critical pressure value is greater than or equal to the seventh critical pressure value.

[0030] When the second control unit determines that the detected pressure value is greater than the eighth critical pressure value, the second control unit determines whether the detected pressure value is greater than a ninth critical pressure value, wherein the ninth critical pressure value is greater than the eighth critical pressure value.

[0031] When the second control unit determines that the detected pressure value is greater than the ninth critical pressure value, the second control unit switches to the third mode.

[0032] When the second control unit determines that the detected pressure value is not greater than the ninth critical pressure value, the second control unit further determines whether the detected pressure value is less than the seventh critical pressure value.

[0033] In some embodiments, in the second mode, when the first control unit determines that the first timing record has not exceeded the first time threshold value, the first control unit determines whether the detected pressure value is less than the fifth critical pressure value, where the fifth critical pressure value is less than the third critical pressure value.

[0034] When the first control unit determines that the detected pressure value is less than the fifth critical pressure value, the first control unit controls the first pump to start and determines whether the second shutdown condition is satisfied.

[0035] In some embodiments, when the first control unit determines that the first timing record has not exceeded the first time threshold value and the second control unit determines that the second timing record has not exceeded the second time threshold value, the first control unit and the second control unit update the first time threshold value and the second time threshold value according to the detected pressure value, where the smaller the detected pressure value, the smaller the first time threshold value and the second time threshold value.

[0036] In some embodiments, when the first control unit determines whether the first start condition is satisfied, the first control unit determines whether the detected pressure value is less than the tenth critical pressure value, where the tenth critical pressure value is less than the second critical pressure value.

[0037] When the first control unit determines that the detected pressure value is less than the tenth critical pressure value, the first control unit controls the first pump to start and determines whether the second shutdown condition is satisfied.

[0038] Wherein, when the second control unit determines whether the second start condition is satisfied, the second control unit determines whether the detected pressure value is less than the eleventh critical pressure value, where the eleventh critical pressure value is less than the seventh critical pressure value.

[0039] When the second control unit determines that the detected pressure value is less than the eleventh critical pressure value, the second control unit controls the second pump to start and determines whether the fourth shutdown condition is satisfied.

[0040] In some embodiments, when the first control unit determines that the detected pressure value is not less than the tenth critical pressure value, the first control unit determines whether the detected pressure value is greater than the third critical pressure value, where the third critical pressure value is greater than or equal to the second critical pressure value.

[0041] When the first control unit determines that the detected pressure value is greater than the third critical pressure value, the first control unit determines whether the detected pressure value is greater than the fourth critical pressure value, where the fourth critical pressure value is greater than the third critical pressure value.

[0042] When the first control unit determines that the detected pressure value is greater than the fourth critical pressure value, the first control unit switches to the first startup mode.

[0043] When the first control unit determines that the detected pressure value is not greater than the fourth critical pressure value, the first control unit determines again whether the detected pressure value is less than the second critical pressure value.

[0044] Wherein, when the second control unit determines that the detected pressure value is not less than the eleventh critical pressure value, the second control unit determines whether the detected pressure value is greater than the eighth critical pressure value, where the eighth critical pressure value is greater than or equal to the seventh critical pressure value.

[0045] When the second control unit determines that the detected pressure value is greater than the eighth critical pressure value, the second control unit determines whether the detected pressure value is greater than the ninth critical pressure value, where the ninth critical pressure value is greater than the eighth critical pressure value.

[0046] When the second control unit determines that the detected pressure value is greater than the ninth critical pressure value, the second control unit switches to the third mode.

[0047] When the second control unit determines that the detected pressure value is not greater than the ninth critical pressure value, the second control unit determines again whether the detected pressure value is less than the seventh critical pressure value.

[0048] Therefore, another object of the present invention is to provide a dual-pump control method in which the two pumps can operate in coordination without communication.

[0049] Therefore, the dual-pump control method of the present invention is implemented by a dual-pump control system. The dual-pump control system is applicable to connect and control a first pump and a second pump installed in a pipeline. The pipeline is further provided with a pressure tank for temporarily storing the liquid pressurized by the first pump and the second pump. The dual-pump control system includes a first control unit, a second control unit, and two pressure sensors. The first control unit is adapted to be electrically connected to the first pump and control the operation of the first pump, and can execute in a first mode and a second mode. The second control unit is adapted to be electrically connected to the second pump and control the operation of the second pump, and can execute in a third mode and a fourth mode. The pressure sensors are respectively electrically connected to the first control unit and the second control unit. The pressure sensors detect the water pressure in the pipeline and transmit a detected pressure value to the corresponding first control unit and second control unit. The dual-pump control method includes:

[0050] The first control unit and the second control unit are respectively set to start execution from the first mode and the fourth mode, or start execution from the second mode and the third mode; in the first mode, the first control unit controls the first pump to standby and determines whether the detected pressure value is less than a first critical pressure value; when the first control unit determines that the detected pressure value is less than the first critical pressure value, the first control unit controls the first pump to start and determines whether a first shutdown condition is satisfied; when the first control unit determines that the first shutdown condition is satisfied, the first control unit switches to the second mode; in the second mode, the first control unit controls the first pump to standby and determines whether the detected pressure value is less than a second critical pressure value; when the first control unit determines that the detected pressure value is less than the second critical pressure value, the first control unit determines whether a first start condition related to water pressure or time is satisfied; when the first control unit determines that the first start condition is satisfied, the first control unit controls the first pump to start and determines whether a second shutdown condition is satisfied; when the first control unit determines that the second shutdown condition is satisfied, the first control unit switches to the first mode; in the third mode, the second control unit controls the second pump to standby and determines whether the detected pressure value is less than a sixth critical pressure value; when the second control unit determines that the detected pressure value is less than the sixth critical pressure value, the second control unit controls the second pump to start and determines whether a third shutdown condition is satisfied; when the second control unit determines that the third shutdown condition is satisfied, the second control unit switches to the fourth mode; in the fourth mode, the second control unit controls the second pump to standby and determines whether the detected pressure value is less than a seventh critical pressure value; when the second control unit determines that the detected pressure value is less than the seventh critical pressure value, the second control unit determines whether a second start condition related to water pressure or time is satisfied; when the second control unit determines that the second start condition is satisfied, the second control unit controls the second pump to start and determines whether a fourth shutdown condition is satisfied; and when the second control unit determines that the fourth shutdown condition is satisfied, the second control unit switches to the third mode.

[0051] The beneficial effects of the present invention are as follows: By setting the first control unit and the second control unit to start execution from the first mode and the fourth mode respectively, or from the second mode and the third mode respectively, and performing the switching between the first mode, the second mode, the third mode, and the fourth mode during the operation process, the first control unit and the second control unit alternately take turns to be in the first mode and the third mode, avoiding one of the first pump and the second pump from being damaged earlier than the other due to long-term operation. Moreover, the first control unit and the second control unit can switch the priority start sequence without communication. And by the first control unit in the second mode determining that the first start condition is met and the second control unit in the fourth mode controlling the first pump and the second pump to start only when it determines that the second start condition is met, the time for the first pump and the second pump to start simultaneously is reduced, thereby extending the service life of the first pump and the second pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 FIG. is a schematic diagram of the hardware connection relationship of a first embodiment of the dual-pump control system of the present invention, and the dual-pump control system is suitable for connecting and controlling a first pump and a second pump;

[0053] Figure 2 FIG. is a flowchart illustrating a first mode of a first embodiment of the dual-pump control method of the present invention;

[0054] Figure 3 FIG. is a flowchart illustrating a second mode of the first embodiment, wherein after determining that a detected pressure value is less than a second critical pressure value, it is determined whether a first start condition related to time is met;

[0055] Figure 4 FIG. is a flowchart illustrating a third mode of the first embodiment of the dual-pump control method of the present invention;

[0056] Figure 5 FIG. is a flowchart illustrating a fourth mode of the first embodiment, wherein after determining that the detected pressure value is less than a seventh critical pressure value, it is determined whether a second start condition related to time is met;

[0057] Figure 6 FIG. is a flowchart illustrating the second mode of a second embodiment of the dual-pump control method of the present invention, wherein after determining that the detected pressure value is less than the second critical pressure value, it is determined whether the first start condition related to water pressure is met;

[0058] Figure 7It is a flowchart illustrating the fourth mode of the second embodiment of the dual-pump control method of the present invention. After determining that the detected pressure value is less than the seventh critical pressure value, it is determined whether the second startup condition related to the water pressure is satisfied. Detailed implementation

[0059] Refer to Figure 1 , a first embodiment of the dual-pump control method of the present invention is implemented by a dual-pump control system 100. The dual-pump control system 100 is suitable for connecting to and controlling a first pump 91 and a second pump 92 installed in a pipeline. The pipeline is also provided with a pressure tank (not shown in the figure) for temporarily storing the liquid pressurized by the first pump and the second pump. The dual-pump control system 100 includes a first control unit 1, a second control unit 2, and two pressure sensors 3.

[0060] The first control unit 1 is suitable for being electrically connected to the first pump 91 and controlling the operation of the first pump 91, and can execute in a first mode and a second mode. The second control unit 2 is suitable for being electrically connected to the second pump 92 and controlling the operation of the second pump 92, and can execute in a third mode and a fourth mode. The pressure sensors 3 are respectively electrically connected to the first control unit 1 and the second control unit 2. The pressure sensors 3 detect the water pressure in the pipeline and transmit a detected pressure value to the corresponding first control unit 1 and second control unit 2. The pressure sensors 3 can also be implemented by using one or more pressure switches for detecting the water pressure in the pipeline to achieve the same effect as the pressure sensors 3.

[0061] Wherein, the detected pressure value can be the current water pressure detected by the pressure sensor 3 in the pipeline, or the water pressure detected for a period of time, and the average water pressure during the period is calculated as the detected pressure value.

[0062] The first control unit 1 and the second control unit 2 may include (but are not limited to) at least one of a single-core processor, a multi-core processor, a dual-core mobile phone processor, a microprocessor, a microcontroller, a digital signal processor (DSP), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), and a radio frequency integrated circuit (RFIC).

[0063] The first control unit 1 and the second control unit 2 are respectively set to start execution from the first mode and the fourth mode, or start execution from the second mode and the third mode. In practice, when the dual-pump control system 100 is powered off and restarted, the first control unit 1 and the second control unit 2 will continue to execute from the modes recorded before the power-off.

[0064] Refer to Figure 2 , the following describes the steps performed by the first mode of the first control unit 1 in the dual-pump control system 100. First, as shown in step S01, the first control unit 1 controls the first pump 91 to standby.

[0065] Next, as shown in step S02, the first control unit 1 determines whether the detected pressure value is less than a first critical pressure value (for example, 1.5 kg / cm 2 ), if so, step S03 is executed, if not, this step S02 is repeated.

[0066] Next, as shown in step S03, the first control unit 1 controls the first pump 91 to start.

[0067] Next, as shown in step S04, the first control unit 1 determines whether a first shutdown condition is satisfied. If so, step S05 is executed. If not, this step S04 is repeated. Among them, the judgment of the first shutdown condition can be related to water pressure or flow rate.

[0068] Next, as shown in step S05, the first control unit 1 switches to the second mode.

[0069] Refer to Figure 3 , the following describes the steps performed by the second mode of the first control unit 1 in the first embodiment of the dual-pump control system 100. In the first embodiment, compared with the first mode, the second mode mainly adds a judgment of a first start condition related to time (seen in steps S13 and S14) before the first control unit 1 controls the first pump 91 to start.

[0070] First, as shown in step S11, the first control unit 1 controls the first pump 91 to standby.

[0071] Next, as shown in step S12, the first control unit 1 determines whether the detected pressure value is less than a second critical pressure value (for example, 1.5 kg / cm 2 ), if so, step S13 is executed, if not, this step S12 is repeated.

[0072] Next, as shown in step S13, the first control unit 1 starts timing to generate a first timing record.

[0073] Next, as shown in step S14, the first control unit 1 determines whether the first timing record is greater than a first time threshold value. If so, step S15 is executed. If not, step S16 is executed.

[0074] Next, as shown in step S15, the first control unit 1 controls the first pump 91 to start.

[0075] After the detected pressure value is less than the first critical pressure value, the first control unit 1 delays the first time threshold value before controlling the first pump 91 to start, which can reduce the situation where the first pump 91 and the second pump 92 start simultaneously.

[0076] When the judgment in step S14 is negative, next, as shown in step S16, the first control unit 1 determines whether the detected pressure value is greater than a third critical pressure value (for example, 1.5 kg / cm 2 ), where the third critical pressure value is greater than or equal to the second critical pressure value. If so, step S17 is executed; if not, step S18 is executed.

[0077] When the judgment in step S16 is positive, next, as shown in step S17, the first control unit 1 determines whether the detected pressure value is greater than a fourth critical pressure value (for example, 1.8 kg / cm 2 ), where the fourth critical pressure value is greater than the third critical pressure value. If the judgment in step S17 is positive, step S20 is executed. In practice, it means that at this time, only the second pump 92 started by the second control unit 2 in the third mode is sufficient to raise the water pressure, so the first control unit 1 does not need to start the first pump 91; if the judgment in step S17 is negative, it returns to step S12. In practice, it means that only the second pump 92 started by the second control unit 2 in the third mode can temporarily meet the current water usage demand, and the water pressure will not be too low but cannot be raised to be greater than the fourth critical pressure value. Therefore, the first control unit 1 does not switch to the first mode.

[0078] When the judgment in step S16 is negative, next, as shown in step S18, the first control unit 1 determines whether the detected pressure value is less than a fifth critical pressure value (for example, 1.0 kg / cm 2 ), where the fifth critical pressure value is less than the third critical pressure value. If so, step S15 is executed; if not, it returns to step S14.

[0079] In step S18, when the first control unit 1 determines that the detected pressure value is less than the fifth critical pressure value, if this condition is met, it means that the water pressure is already too low at this time. Therefore, instead of returning to step S14, step S15 is directly executed, causing the first control unit 1 to control the first pump 91 to start. Thus, when the water pressure drops too fast, the first control unit 1 can timely control the first pump 91 to start, avoiding the first pump 91 from waiting too long before being started. This design can improve the user experience when the water pressure drops too fast.

[0080] It is worth mentioning that in other embodiments, before step S14 is executed again when the judgment in step S18 is negative, the first control unit 1 dynamically adjusts the first time threshold according to the detected pressure value. Among them, the smaller the detected pressure value, the smaller the first time threshold, indicating that when the water pressure is lower, the first control unit 1 can meet step S14 in a shorter time to execute step S15, so that when the water pressure is low, the first control unit 1 will control the first pump 91 to start relatively quickly.

[0081] It should be added that when step S14 is judged to be yes and step S15 is executed, it means that the detected pressure value continuously fluctuates between the third critical pressure value and the fifth critical pressure value and continues until the first timing record is greater than the first time threshold, and then step S15 will be executed. This situation indicates that the second pump 92 started by the second control unit 2 in the third mode is not sufficient to meet the current water usage demand, but the water pressure is not so low that the first pump 91 must be started immediately. Therefore, it is not until the first control unit 1 judges in step S14 that the first timing record is greater than the first time threshold that step S15 will be executed.

[0082] Steps S14 and S18 indicate that when the second pump 92 started by the second control unit 2 in the third mode cannot meet the current water usage demand or fails, the first control unit 1 in the second mode will control the first pump 91 to make up for the operation.

[0083] After step S15, then, as shown in step S19, the first control unit 1 judges whether a second shutdown condition is met. If so, step S20 is executed; if not, this step S19 is repeatedly executed. Among them, the judgment of the second shutdown condition can be related to water pressure or flow rate.

[0084] Next, as shown in step S20, the first control unit 1 switches to the first mode.

[0085] Refer to Figure 4, the steps performed by the third mode of the second control unit 2 in the dual-pump control system 100 are described below. First, as shown in step S21, the second control unit 2 controls the second pump 92 to standby.

[0086] Next, as shown in step S22, the second control unit 2 determines whether the detected pressure value is less than a sixth critical pressure value (e.g., 1.5 kg / cm 2 ), if so, step S23 is executed, if not, this step S22 is repeatedly executed.

[0087] Next, as shown in step S23, the second control unit 2 controls the second pump 92 to start.

[0088] Next, as shown in step S24, the second control unit 2 determines whether a third shutdown condition is satisfied. If so, step S25 is executed, if not, this step S24 is repeatedly executed. Among them, the judgment of the third shutdown condition can be related to water pressure or flow rate.

[0089] Next, as shown in step S25, the second control unit 2 switches to the fourth mode.

[0090] Refer to Figure 5 , the steps performed by the fourth mode of the second control unit 2 in the first embodiment of the dual-pump control system 100 are described below. In the first embodiment, the fourth mode mainly has less operation that can immediately start the second pump 92 compared to the second mode.

[0091] First, as shown in step S31, the second control unit 2 controls the second pump 92 to standby.

[0092] Next, as shown in step S32, the second control unit 2 determines whether the detected pressure value is less than a seventh critical pressure value (e.g., 1.5 kg / cm 2 ), if so, step S33 is executed, if not, this step S32 is repeatedly executed.

[0093] When the judgment in step S32 is yes, next, as shown in step S33, the second control unit 2 starts timing to generate a second timing record.

[0094] Next, as shown in step S34, the second control unit 2 determines whether the second timing record is greater than a second time threshold. If so, step S35 is executed, if not, step S36 is executed.

[0095] When the judgment in step S34 is yes, next, as shown in step S35, the second control unit 2 controls the second pump 92 to start.

[0096] After the detected pressure value is less than the seventh critical pressure value, the second control unit 2 delays the second time threshold before controlling the second pump 92 to start, which can reduce the situation where the first pump 91 and the second pump 92 start simultaneously.

[0097] Next, as shown in step S36, the second control unit 2 determines whether the detected pressure value is greater than an eighth critical pressure value (for example, 1.5 kg / cm 2 ), where the eighth critical pressure value is greater than or equal to the seventh critical pressure value. If so, step S37 is executed; if not, the process returns to step S34. It is worth mentioning that before executing step S34, the second control unit 2 dynamically adjusts the second time threshold according to the detected pressure value. The smaller the detected pressure value, the smaller the second time threshold, which means that when the water pressure is lower, the second control unit 2 can meet step S34 in a shorter time to execute step S35, so that when the water pressure is low, the second control unit 2 will control the second pump 92 to start more quickly.

[0098] When the determination in step S36 is yes, then, as shown in step S37, the second control unit 2 determines whether the detected pressure value is greater than a ninth critical pressure value (for example, 1.8 kg / cm 2 ), where the ninth critical pressure value is greater than the eighth critical pressure value. If the determination in step S37 is yes, step S39 is executed, which practically means that at this time, only the first pump 91 started by the first control unit 1 in the first mode is sufficient to raise the water pressure, so the second control unit 2 does not need to start the second pump 92; if the determination in step S37 is no, the process returns to step S32, which practically means that only the first pump 91 started by the first control unit 1 in the first mode can temporarily meet the current water use demand, and the water pressure will not be too low but cannot be raised to be greater than the ninth critical pressure value, so the second control unit 2 does not switch to the third mode.

[0099] It should be added that when the determination in step S34 is yes and step S35 is executed, it means that the detected pressure value continuously remains lower than the eighth critical pressure value, and it is not until the second timing record is greater than the second time threshold that step S35 will be executed. This situation indicates that the first pump 91 started by the first control unit 1 in the first mode is not sufficient to meet the current water use demand, or the first pump 91 fails, so the second control unit 2 needs to start the second pump 92 to raise the water pressure.

[0100] After step S35, then, as shown in step S38, the second control unit 2 determines whether a fourth shutdown condition is satisfied. If so, step S39 is executed; if not, this step S38 is repeatedly executed. Among them, the determination of the fourth shutdown condition may be related to water pressure or flow rate.

[0101] Then, as shown in step S39, the second control unit 2 switches to the third mode.

[0102] It should be added that in other embodiments, for the mechanism of delaying the start of the pump in steps S12, S13, S14 and steps S32, S33, S34, during implementation, it can also be designed that after starting to time in steps S13 and S33, it is again determined whether the detected pressure value continuously drops to a lower critical pressure value. If so, timing is started separately and it is determined whether the new timing record reaches a time threshold with a shorter time, that is to say, the mechanism of delaying the start of the pump can also be designed into multiple groups, and the critical pressure value and time threshold value executed later are smaller, so that the first control unit 1 and the second control unit 2 will control the first pump 91 and the second pump 92 to start more quickly when the detected pressure value is lower.

[0103] Refer to Figure 6 and Figure 7 , the steps executed in the second mode and the fourth mode in a second embodiment of the dual-pump control system 100 are described below. Among them, compared with the first embodiment, the second embodiment mainly changes the first start condition and the second start condition related to time in the first embodiment to be related to water pressure.

[0104] Refer to Figure 6 , the steps executed by the first control unit 1 in the second mode of the second embodiment of the dual-pump control system 100 are described below. First, as shown in step S51, the first control unit 1 controls the first pump 91 to standby.

[0105] Then, as shown in step S52, the first control unit 1 determines whether the detected pressure value is less than the second critical pressure value. If so, step S53 is executed; if not, this step S52 is repeatedly executed.

[0106] When the determination in step S52 is yes, then, as shown in step S53, the first control unit 1 determines whether the detected pressure value is less than a tenth critical pressure value (for example, 1.3 kg / cm 2 ), where the tenth critical pressure value is less than the second critical pressure value. If so, step S54 is executed; if not, step S55 is executed.

[0107] When the judgment in step S53 is affirmative, then, as shown in step S54, the first control unit 1 controls the first pump 91 to start.

[0108] In the second embodiment, when the water pressure drops during use, the second control unit 2 in the third mode will still first control the second pump 92 to start, until the first control unit 1 in the second mode determines that when the detected pressure value is less than the tenth critical pressure value, the first control unit 1 will then control the first pump 91 to start.

[0109] When the judgment in step S53 is negative, then, as shown in step S55, the first control unit 1 determines whether the detected pressure value is greater than the third critical pressure value. If it is, step S56 is executed; if not, it returns to step S53.

[0110] When the judgment in step S55 is affirmative, then, as shown in step S56, the first control unit 1 determines whether the detected pressure value is greater than the fourth critical pressure value, where the fourth critical pressure value is greater than the third critical pressure value. If the judgment in step S56 is affirmative, step S58 is executed, which practically means that at this time, only the second pump 92 started by the second control unit 2 in the third mode is sufficient to raise the water pressure; if the judgment in step S56 is negative, it returns to step S52, which practically means that only the second pump 92 started by the second control unit 2 in the third mode can temporarily meet the current water use demand, and will not cause the water pressure to be too low but also cannot raise the water pressure to be greater than the fourth critical pressure value. Therefore, the first control unit 1 does not switch to the first mode.

[0111] After step S54, then, as shown in step S57, the first control unit 1 determines whether the second shutdown condition is met. If it is, step S58 is executed; if not, this step S57 is repeatedly executed.

[0112] When the judgment in step S57 is affirmative, then, as shown in step S58, the first control unit 1 switches to the first mode.

[0113] Refer to Figure 7 Referring to, the steps performed by the fourth mode of the second control unit 2 in the second embodiment of the dual-pump control system 100 are described below with reference to the figures. First, as shown in step S61, the second control unit 2 controls the second pump 92 to standby.

[0114] Next, as shown in step S62, the second control unit 2 determines whether the detected pressure value is less than the seventh critical pressure value. If it is, step S63 is executed; if not, this step S62 is repeatedly executed.

[0115] When the judgment in step S62 is yes, then, as shown in step S63, the second control unit 2 judges whether the detected pressure value is less than an eleventh critical pressure value (for example, 1.3 kg / cm 2 ), wherein the eleventh critical pressure value is less than the seventh critical pressure value. If so, step S64 is executed; if not, step S65 is executed.

[0116] When the judgment in step S63 is yes, then, as shown in step S64, the second control unit 2 controls the second pump 92 to start.

[0117] In the second embodiment, when the water pressure drops during use, the first control unit 1 in the first mode will still first control the first pump 91 to start until the second control unit 2 in the fourth mode judges that when the detected pressure value is less than the eleventh critical pressure value, the second control unit 2 will then control the second pump 92 to start.

[0118] When the judgment in step S63 is no, then, as shown in step S65, the second control unit 2 judges whether the detected pressure value is greater than the eighth critical pressure value. If so, step S66 is executed; if not, it returns to step S63.

[0119] When the judgment in step S65 is yes, then, as shown in step S66, the second control unit 2 judges whether the detected pressure value is greater than the ninth critical pressure value, wherein the ninth critical pressure value is greater than the eighth critical pressure value. If the judgment in step S66 is yes, step S68 is executed, which practically means that at this time, only the first pump 91 started by the first control unit 1 in the first mode is sufficient to raise the water pressure; if the judgment in step S66 is no, it returns to step S62, which practically means that only the first pump 91 started by the first control unit 1 in the first mode can temporarily meet the current water use demand, and the water pressure will not be too low but cannot be raised to be greater than the ninth critical pressure value, so the second control unit 2 does not switch to the third mode.

[0120] After step S64, then, as shown in step S67, the second control unit 2 judges whether the fourth shutdown condition is satisfied. If so, step S68 is executed; if not, this step S67 is repeatedly executed.

[0121] When the judgment in step S67 is yes, then, as shown in step S68, the second control unit 2 switches to the third mode.

[0122] It should be noted that in the first embodiment and the second embodiment, the first control unit 1 and the second control unit 2 with frequency conversion control functions are used, so that the first pump 91 and the second pump 92 can be pumps with frequency conversion effects. The judgment of the above first shutdown condition, second shutdown condition, third shutdown condition and fourth shutdown condition can be related to water pressure or flow rate. Taking the first shutdown condition as an example, for example, the first control unit 1 reduces the speed of the corresponding first pump 91. If the detected pressure value does not decrease, it means that there is no current water demand, and the first shutdown condition is satisfied. If the detected pressure value decreases, it means that there is still current water demand, and the first shutdown condition is not satisfied.

[0123] It is worth mentioning that the first control unit 1 and the second control unit 2 in the dual-pump control system 100 of the present invention can be implemented by two identical control units. After the control units are respectively installed, the user sets the control units into the first control unit 1 and the second control unit 2 with different expressions respectively.

[0124] In summary, the dual-pump control system 100 of the present invention is respectively set by the first control unit 1 and the second control unit 2 to start execution from the first mode and the fourth mode, or from the second mode and the third mode, and performs the switching between the first mode, the second mode, the third mode and the fourth mode during the operation process, so that the first control unit 1 and the second control unit 2 alternately take turns to be in the first mode and the third mode, avoiding one of the first pump 91 and the second pump 92 from being damaged earlier than the other due to long-term operation. Moreover, the first control unit 1 and the second control unit 2 can switch the priority start sequence without communication, and the first control unit 1 in the second mode judges that the first start condition is satisfied, and the second control unit 2 in the fourth mode controls the first pump 91 and the second pump 92 to start only when it judges that the second start condition is satisfied, so as to reduce the simultaneous start time of the first pump 91 and the second pump 92, thereby extending the service life of the first pump 91 and the second pump 92.

[0125] However, the above are only the embodiments of the present invention, and the scope of implementation of the present invention cannot be limited thereby. All simple equivalent changes and modifications made according to the claims and the content of the specification of the present invention still fall within the scope covered by the present invention.

Claims

1. A dual-pump control system is applicable to connect and control a first pump and a second pump installed in a pipeline. The pipeline is further provided with a pressure barrel for temporarily storing the liquid pressurized by the first pump and the second pump. It is characterized in that, The dual-pump control system includes: A first control unit, adapted to be electrically connected to the first pump and control the operation of the first pump, and capable of operating in a first mode and a second mode; A second control unit, adapted to be electrically connected to the second pump and control the operation of the second pump, and capable of operating in a third mode and a fourth mode; and Two pressure sensors, electrically connected to the first control unit and the second control unit respectively, the pressure sensors detect the water pressure in the pipeline and transmit the detected pressure values to the corresponding first control unit and second control unit; The first control unit and the second control unit are respectively set to start execution from the first mode and the fourth mode, or start execution from the second mode and the third mode; In the first mode, the first control unit controls the first pump to standby and determines whether the detected pressure value is less than a first critical pressure value; When the first control unit determines that the detected pressure value is less than the first critical pressure value, the first control unit controls the first pump to start and determines whether the first shutdown condition is satisfied; When the first control unit determines that the first shutdown condition is satisfied, the first control unit switches to the second mode; In the second mode, the first control unit controls the first pump to standby and determines whether the detected pressure value is less than a second critical pressure value; When the first control unit determines that the detected pressure value is less than the second critical pressure value, the first control unit determines whether the first start condition related to water pressure or time is satisfied; When the first control unit determines that the first start condition is satisfied, the first control unit controls the first pump to start and determines whether the second shutdown condition is satisfied; When the first control unit determines that the second shutdown condition is satisfied, the first control unit switches to the first mode; In the third mode, the second control unit controls the second pump to standby and determines whether the detected pressure value is less than a sixth critical pressure value; When the second control unit determines that the detected pressure value is less than the sixth critical pressure value, the second control unit controls the second pump to start and determines whether the third shutdown condition is satisfied; When the second control unit determines that the third shutdown condition is satisfied, the second control unit switches to the fourth mode; In the fourth mode, the second control unit controls the second pump to standby and determines whether the detected pressure value is less than a seventh critical pressure value; When the second control unit determines that the detected pressure value is less than the seventh critical pressure value, the second control unit determines whether the second start condition related to water pressure or time is satisfied; When the second control unit determines that the second start condition is satisfied, the second control unit controls the second pump to start and determines whether the fourth shutdown condition is satisfied; When the second control unit determines that the fourth shutdown condition is satisfied, the second control unit switches to the third mode.

2. The dual-pump control system according to claim 1, characterized in that: When the first control unit determines whether the first startup condition is satisfied, the first control unit starts timing to generate a first timing record, and determines whether the first timing record is greater than a first time threshold value; When the first control unit determines that the first timing record is greater than the first time threshold value, the first control unit controls the first pump to start, and determines whether the second shutdown condition is satisfied; Wherein, when the second control unit determines whether the second startup condition is satisfied, the second control unit starts timing to generate a second timing record, and determines whether the second timing record is greater than a second time threshold value; When the second control unit determines that the second timing record is greater than the second time threshold value, the second control unit controls the second pump to start, and determines whether the fourth shutdown condition is satisfied.

3. The dual-pump control system according to claim 2, wherein: When the first control unit determines that the first timing record is not greater than the first time threshold value, the first control unit determines whether the detected pressure value is greater than a third critical pressure value, wherein the third critical pressure value is greater than or equal to the second critical pressure value; When the first control unit determines that the detected pressure value is greater than the third critical pressure value, the first control unit determines whether the detected pressure value is greater than a fourth critical pressure value, wherein the fourth critical pressure value is greater than the third critical pressure value; When the first control unit determines that the detected pressure value is greater than the fourth critical pressure value, the first control unit switches to the first mode; When the first control unit determines that the detected pressure value is not greater than the fourth critical pressure value, the first control unit determines again whether the detected pressure value is less than the second critical pressure value; Wherein, when the second control unit determines that the second timing record is not greater than the second time threshold value, the second control unit determines whether the detected pressure value is greater than an eighth critical pressure value, wherein the eighth critical pressure value is greater than or equal to the seventh critical pressure value; When the second control unit determines that the detected pressure value is greater than the eighth critical pressure value, the second control unit determines whether the detected pressure value is greater than a ninth critical pressure value, wherein the ninth critical pressure value is greater than the eighth critical pressure value; When the second control unit determines that the detected pressure value is greater than the ninth critical pressure value, the second control unit switches to the third mode; When the second control unit determines that the detected pressure value is not greater than the ninth critical pressure value, the second control unit determines again whether the detected pressure value is less than the seventh critical pressure value.

4. The dual-pump control system according to claim 3, wherein: In the second mode, when the first control unit determines that the first timing record is not greater than the first time threshold value, the first control unit determines whether the detected pressure value is less than a fifth critical pressure value, wherein the fifth critical pressure value is less than the third critical pressure value; When the first control unit determines that the detected pressure value is less than the fifth critical pressure value, the first control unit controls the first pump to start, and determines whether the second shutdown condition is satisfied.

5. The dual-pump control system according to claim 2, wherein: When the first control unit determines that the first timing record has not exceeded the first time threshold value, and the second control unit determines that the second timing record has not exceeded the second time threshold value, the first control unit and the second control unit update the first time threshold value and the second time threshold value according to the detected pressure value, wherein the smaller the detected pressure value, the smaller the first time threshold value and the second time threshold value.

6. The dual-pump control system according to claim 1, characterized in that: When the first control unit determines whether the first starting condition is satisfied, the first control unit determines whether the detected pressure value is less than the tenth critical pressure value, wherein the tenth critical pressure value is less than the second critical pressure value; When the first control unit determines that the detected pressure value is less than the tenth critical pressure value, the first control unit controls the first pump to start and determines whether the second shutdown condition is satisfied; Wherein, when the second control unit determines whether the second starting condition is satisfied, the second control unit determines whether the detected pressure value is less than the eleventh critical pressure value, wherein the eleventh critical pressure value is less than the seventh critical pressure value; When the second control unit determines that the detected pressure value is less than the eleventh critical pressure value, the second control unit controls the second pump to start and determines whether the fourth shutdown condition is satisfied.

7. The dual-pump control system according to claim 6, wherein: When the first control unit determines that the detected pressure value is not less than the tenth critical pressure value, the first control unit determines whether the detected pressure value is greater than the third critical pressure value, wherein the third critical pressure value is greater than or equal to the second critical pressure value; When the first control unit determines that the detected pressure value is greater than the third critical pressure value, the first control unit determines whether the detected pressure value is greater than the fourth critical pressure value, wherein the fourth critical pressure value is greater than the third critical pressure value; When the first control unit determines that the detected pressure value is greater than the fourth critical pressure value, the first control unit switches to the first starting mode; When the first control unit determines that the detected pressure value is not greater than the fourth critical pressure value, the first control unit determines again whether the detected pressure value is less than the second critical pressure value; Wherein, when the second control unit determines that the detected pressure value is not less than the eleventh critical pressure value, the second control unit determines whether the detected pressure value is greater than the eighth critical pressure value, wherein the eighth critical pressure value is greater than or equal to the seventh critical pressure value; When the second control unit determines that the detected pressure value is greater than the eighth critical pressure value, the second control unit determines whether the detected pressure value is greater than the ninth critical pressure value, wherein the ninth critical pressure value is greater than the eighth critical pressure value; When the second control unit determines that the detected pressure value is greater than the ninth critical pressure value, the second control unit switches to the third mode; When the second control unit determines that the detected pressure value is not greater than the ninth critical pressure value, the second control unit further determines whether the detected pressure value is less than the seventh critical pressure value.

8. A dual-pump control method implemented by a dual-pump control system. The dual-pump control system is adapted to connect and control a first pump and a second pump installed in a pipeline. The pipeline is further provided with a pressure tank for temporarily storing the liquid pressurized by the first pump and the second pump. The dual-pump control system includes a first control unit, a second control unit, and two pressure sensors. The first control unit is adapted to be electrically connected to the first pump and control the operation of the first pump, and can execute in a first mode and a second mode. The second control unit is adapted to be electrically connected to the second pump and control the operation of the second pump, and can execute in a third mode and a fourth mode. The pressure sensors are respectively electrically connected to the first control unit and the second control unit. The pressure sensors detect the water pressure in the pipeline and transmit the detected pressure value to the corresponding first control unit and second control unit. The dual-pump control method includes: The first control unit and the second control unit are respectively set to start execution from the first mode and the fourth mode, or start execution from the second mode and the third mode; In the first mode, the first control unit controls the first pump to standby and determines whether the detected pressure value is less than a first critical pressure value; When the first control unit determines that the detected pressure value is less than the first critical pressure value, the first control unit controls the first pump to start and determines whether a first shutdown condition is met; When the first control unit determines that the first shutdown condition is met, the first control unit switches to the second mode; In the second mode, the first control unit controls the first pump to standby and determines whether the detected pressure value is less than a second critical pressure value; When the first control unit determines that the detected pressure value is less than the second critical pressure value, the first control unit determines whether a first start condition related to water pressure or time is met; When the first control unit determines that the first start condition is met, the first control unit controls the first pump to start and determines whether a second shutdown condition is met; When the first control unit determines that the second shutdown condition is met, the first control unit switches to the first mode; In the third mode, the second control unit controls the second pump to standby and determines whether the detected pressure value is less than a sixth critical pressure value; When the second control unit determines that the detected pressure value is less than the sixth critical pressure value, the second control unit controls the second pump to start and determines whether a third shutdown condition is met; When the second control unit determines that the third shutdown condition is met, the second control unit switches to the fourth mode; In the fourth mode, the second control unit controls the second pump to standby and determines whether the detected pressure value is less than a seventh critical pressure value; When the second control unit determines that the detected pressure value is less than the seventh critical pressure value, the second control unit determines whether the second startup condition related to water pressure or time is satisfied; When the second control unit determines that the second startup condition is satisfied, the second control unit controls the second pump to start and determines whether the fourth shutdown condition is satisfied; and When the second control unit determines that the fourth shutdown condition is satisfied, the second control unit switches to the third mode.

9. The dual-pump control method according to claim 8, when the first control unit determines whether the first startup condition is satisfied and the second control unit determines whether the second startup condition is satisfied, further comprising: The first control unit starts timing to generate a first timing record and determines whether the first timing record is greater than a first time threshold; When the first control unit determines that the first timing record is greater than the first time threshold, the first control unit controls the first pump to start and determines whether the second shutdown condition is satisfied; Among them, When the second control unit determines whether the second startup condition is satisfied, the second control unit starts timing to generate a second timing record and determines whether the second timing record is greater than a second time threshold; and When the second control unit determines that the second timing record is greater than the second time threshold, the second control unit controls the second pump to start and determines whether the fourth shutdown condition is satisfied.

10. The dual-pump control method according to claim 9, when the first control unit determines that the first timing record is not greater than the first time threshold and the second control unit determines that the second timing record is not greater than the second time threshold, further comprising: The first control unit determines whether the detected pressure value is greater than a third critical pressure value, where, The third critical pressure value is greater than or equal to the second critical pressure value; When the first control unit determines that the detected pressure value is greater than the third critical pressure value, the first control unit determines whether the detected pressure value is greater than a fourth critical pressure value, wherein the fourth critical pressure value is greater than the third critical pressure value; When the first control unit determines that the detected pressure value is greater than the fourth critical pressure value, the first control unit switches to the first mode; When the first control unit determines that the detected pressure value is not greater than the fourth critical pressure value, the first control unit determines again whether the detected pressure value is less than the second critical pressure value; The second control unit determines whether the detected pressure value is greater than an eighth critical pressure value, wherein the eighth critical pressure value is greater than or equal to the seventh critical pressure value; When the second control unit determines that the detected pressure value is greater than the eighth critical pressure value, the second control unit determines whether the detected pressure value is greater than a ninth critical pressure value, wherein the ninth critical pressure value is greater than the eighth critical pressure value; When the second control unit determines that the detected pressure value is greater than the ninth critical pressure value, the second control unit switches to the third mode; and When the second control unit determines that the detected pressure value is not greater than the ninth critical pressure value, the second control unit further determines whether the detected pressure value is less than the seventh critical pressure value.

11. The dual-pump control method according to claim 10, in the second mode, when the first control unit determines that the first timing record has not exceeded the first time threshold, further comprising: The first control unit determines whether the detected pressure value is less than a fifth critical pressure value, where the fifth critical pressure value is less than the third critical pressure value; and when the first control unit determines that the detected pressure value is less than the fifth critical pressure value, the first control unit controls the first pump to start and determines whether the second shutdown condition is satisfied.

12. The dual-pump control method according to claim 9, when the first control unit determines that the first timing record has not exceeded the first time threshold and the second control unit determines that the second timing record has not exceeded the second time threshold, further comprising: The first control unit and the second control unit update the first time threshold value and the second time threshold value according to the detected pressure value, wherein, the smaller the detected pressure value, the smaller the first time threshold and the second time threshold.

13. The dual-pump control method according to claim 8, when the first control unit determines whether the first start condition is satisfied and when the second control unit determines whether the second start condition is satisfied, further comprising: The first control unit determines whether the detected pressure value is less than a tenth critical pressure value, where the tenth critical pressure value is less than the second critical pressure value; and when the first control unit determines that the detected pressure value is less than the tenth critical pressure value, the first control unit controls the first pump to start and determines whether the second shutdown condition is satisfied; the second control unit determines whether the detected pressure value is less than the eleventh critical pressure value, wherein the eleventh critical pressure value is less than the seventh critical pressure value; and when the second control unit determines that the detected pressure value is less than the eleventh critical pressure value, the second control unit controls the second pump to start and determines whether the fourth shutdown condition is satisfied.

14. The dual-pump control method according to claim 13, when the first control unit determines that the detected pressure value is not less than the tenth critical pressure value and the second control unit determines that the detected pressure value is not less than the eleventh critical pressure value, further comprising: The first control unit determines whether the detected pressure value is greater than a third critical pressure value, where the third critical pressure value is greater than or equal to the second critical pressure value; when the first control unit determines that the detected pressure value is greater than the third critical pressure value, the first control unit determines whether the detected pressure value is greater than the fourth critical pressure value, wherein the fourth critical pressure value is greater than the third critical pressure value; when the first control unit determines that the detected pressure value is greater than the fourth critical pressure value, the first control unit switches to the first start mode; when the first control unit determines that the detected pressure value is not greater than the fourth critical pressure value, the first control unit further determines whether the detected pressure value is less than the second critical pressure value; the second control unit determines whether the detected pressure value is greater than the eighth critical pressure value, wherein the eighth critical pressure value is greater than or equal to the seventh critical pressure value; When the second control unit determines that the detected pressure value is greater than the eighth critical pressure value, the second control unit determines whether the detected pressure value is greater than the ninth critical pressure value, where the ninth critical pressure value is greater than the eighth critical pressure value; When the second control unit determines that the detected pressure value is greater than the ninth critical pressure value, the second control unit switches to the third mode; and When the second control unit determines that the detected pressure value is not greater than the ninth critical pressure value, the second control unit determines again whether the detected pressure value is less than the seventh critical pressure value.

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