Bubble generation system and control method thereof

Abstract

The invention relates to a bubble generating system and a control method thereof, and the bubble generating system comprises a bubble generator which is provided with a water path inlet, a gas path inlet and a bubble water outlet; the heating module is arranged on a water outlet pipe communicated with the bubble water outlet of the bubble generator; the first bubble detection module is used for detecting the bubble content between the bubble water outlet of the bubble generator and the water inlet end of the heating module; the second bubble detection module is used for detecting the bubble content of the water outlet end of the heating module; the adjustable valve is arranged on the pipeline between the heating module and the second bubble detection module; and the controller is in electric signal connection with the first bubble detection module, the second bubble detection module and the adjustable valve, and is configured to correspondingly adjust the opening degree of the adjustable valve according to the detection results of the first bubble detection module and the second bubble detection module. The bubble generating system not only can enable the bubble content to reach the standard, but also can keep the outlet water temperature to meet the requirement all the time, so that the optimal use effect of a user is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a bubble generating system for household appliances such as water purifiers and water heaters and a control method thereof. Background Art

[0002] As people's demand for healthy living continues to increase, the diversification of water demand has gradually emerged. For example, users want water to have the effect of removing pesticide residues in some scenarios of washing fruits and vegetables. Currently, there is a bubble generating device on the market that can produce ultra-fine bubble water. It mixes gas into water at a micro-nano size to further form small molecule water clusters. When cleaning objects, ultra-fine bubbles cavitation and rupture, enhancing the cleaning effect of dirty objects being cleaned. Now, such bubble generating devices that can generate microbubbles have excellent cleaning functions and can bring better experience to users, and are increasingly favored by market consumers.

[0003] Although micro-nano bubbles can greatly improve the cleaning effect of water, it is still not enough to clean some stubborn stains. When cleaning objects, the temperature of the cleaning medium is a very important factor, because temperature can accelerate the dissolution of pollutants in water and soften stubborn stains. At the same time, in cold weather, using hot water for cleaning will bring users a happy experience that is self-evident. For example, a Chinese invention patent with application number CN202110374414.0 (application publication number CN115235110A) discloses a water heater, which includes a water system, a gas system, a heating system and a mixing device; the water system includes a water supply pipeline, a first water outlet pipeline, a boosting device and a first control valve, the water outlet end of the water supply pipeline is connected to the mixing device, the water inlet end of the first water outlet pipeline is connected to the mixing device, the boosting device is arranged on the first water outlet pipeline, and the first control valve is arranged on the water supply pipeline; the gas system includes a gas supply pipeline and a second control valve, the gas supply pipeline is used to transport gas to the mixing device, and the second control valve is arranged on the gas supply pipeline; the heating system is used to heat water passing through the water supply pipeline.

[0004] Although the above water heater can not only produce ordinary hot water, but also produce hot water with a high gas content, which can greatly enrich the user's water experience, the above water heater has the following limitations: the retention time of gas in water is related to temperature. The lower the temperature, the higher the stability of gas in water, while the higher the water temperature, the worse the stability of gas, and the microbubbles are easy to break, agglomerate and increase in volume, and then diffuse from the water, losing the cleaning effect of microbubbles. Therefore, due to the inherent contradiction between the increase in water temperature and the stability of microbubbles, it is difficult to ensure that the water temperature and bubble water content of the bubble water can meet the requirements in the above water heater, so it is necessary to further improve the existing technology. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide a bubble generating system which can not only make the bubble content meet the standard but also keep the outlet water temperature always meeting the requirements, in view of the above-mentioned prior art.

[0006] The second technical problem to be solved by the present invention is to provide a control method for the bubble generating system as mentioned above, which can not only make the bubble content meet the standard, but also keep the outlet water temperature always meeting the requirements.

[0007] The third technical problem to be solved by the present invention is to provide a control method for the bubble generating system as mentioned above, which can both ensure that the bubble content meets the standard and maximize the bubble water flow rate.

[0008] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a bubble generating system, comprising:

[0009] The bubble generator has a water inlet, a gas inlet and a bubble water outlet;

[0010] A heating module is arranged on a water outlet pipe connected to the bubble water outlet of the bubble generator;

[0011] The invention is characterized in that:

[0012] A first bubble detection module, used to detect the bubble content between the bubble water outlet of the bubble generator and the water inlet end of the heating module;

[0013] A second bubble detection module, used to detect the bubble content at the water outlet of the heating module;

[0014] An adjustable valve is provided on the pipeline between the heating module and the second bubble detection module;

[0015] The controller is electrically connected to the first bubble detection module, the second bubble detection module and the adjustable valve, and is configured to adjust the opening of the adjustable valve accordingly according to the detection results of the first bubble detection module and the second bubble detection module.

[0016] To achieve this, the water inlet of the bubble generator is also connected to a raw water inlet pipe, and the raw water inlet pipe is also provided with a booster pump connected to a controller. The controller is also configured to adjust the voltage of the booster pump accordingly according to the detection results of the first bubble detection module and the second bubble detection module.

[0017] In order to filter the raw water and improve the quality of the bubble water, a filter element assembly located downstream of the booster pump is also provided on the raw water inlet pipe.

[0018] In order to detect the outlet water temperature, a first temperature sensor for detecting the water temperature at the outlet water end of the heating module is also included.

[0019] In order to detect the water inlet temperature of the heating module and control the heating power of the heating module, a second temperature sensor for detecting the water temperature between the bubble water outlet of the bubble generator and the water inlet end of the heating module is also included.

[0020] Preferably, the heating module is a heat exchanger.

[0021] Preferably, the first bubble detection module and the second bubble detection module are both turbidity sensors.

[0022] Preferably, the adjustable valve is a back pressure valve.

[0023] The technical solution adopted by the present invention to solve the second technical problem is: a control method of the bubble generating system as described above, characterized in that it comprises the following steps:

[0024] Step 1, setting the outlet water temperature T of the heating module;

[0025] Step 2: Set the heating power of the heating module to a preset value, and calculate the water outlet flow rate F of the heating module according to the pre-stored relationship between the water outlet temperature and the water outlet flow rate of the heating module;

[0026] Step 3, calculating the opening of the adjustable valve;

[0027] Step 4, calculating the voltage of the booster pump, and starting the booster pump with the voltage;

[0028] Step 5: Detect the outlet water temperature t2 in real time through the first temperature sensor, and determine whether the outlet water temperature t2 is equal to T. If so, proceed to step 6; if not, adjust the voltage of the booster pump through the PID algorithm, and continue to detect the outlet water temperature t2 through the first temperature sensor;

[0029] Step 6: collect the result y1 detected by the first bubble detection module and the result y2 detected by the second bubble detection module in real time, and determine whether y2 is greater than or equal to a*y1, where a is the set bubble-free retention coefficient, 0<a≤1. If yes, proceed to step 7; if not, adjust the opening of the adjustable valve by the PID algorithm, and proceed to step 5;

[0030] Step 7: Save the current voltage of the booster pump and the opening of the adjustable valve and use them as reference data for the next time.

[0031] In the above scheme, the opening of the adjustable valve in step 3 and the voltage of the booster pump in step 4 are calculated as follows:

[0032] Different adjustable valve openings are set in sections, the voltage of the booster pump is adjusted, and the flow rate of the booster pump under different voltages is obtained; and the voltage and adjustable valve opening of the booster pump are obtained according to the water outlet flow rate F.

[0033] The technical solution adopted by the present invention to solve the third technical problem is: a control method of the bubble generating system as described above, characterized in that it comprises the following steps:

[0034] Step a, setting the water outlet temperature T of the heating module;

[0035] Step b, calculating the opening of the adjustable valve;

[0036] Step c, calculating the voltage of the booster pump, and starting the booster pump with the voltage;

[0037] Step d, adjusting the heating power of the heating module by using a PID algorithm;

[0038] Step e: Detect the outlet water temperature t2 in real time through the first temperature sensor, and determine whether the outlet water temperature t2 is equal to T. If yes, proceed to step f; if not, proceed to step d;

[0039] Step f, adjusting the opening of the adjustable valve by using a PID algorithm;

[0040] Step g, real-time acquisition of the result y1 detected by the first bubble detection module and the result y2 detected by the second bubble detection module, and determination of whether y2 is greater than or equal to a*y1, where a is the set bubble-free retention coefficient, 0<a≤1, if yes, proceed to step h; if no, proceed to step f;

[0041] Step h, judging whether the heating power of the heating module reaches the maximum value Pmax, if yes, proceeding to step i; if no, adjusting the voltage of the booster pump by the PID algorithm, and proceeding to step e;

[0042] Step i: save the current voltage of the booster pump, the opening of the adjustable valve and the heating power of the heating module, and use them as reference data for the next time.

[0043] Compared with the prior art, the advantages of the present invention are: by setting a first bubble detection module and a second bubble detection module, wherein the first bubble detection module is used to detect the bubble content between the bubble water outlet of the bubble generator and the water inlet end of the heating module, and the second bubble detection module is used to detect the bubble content at the water outlet of the heating module, thereby detecting the change in the content of the bubble water after passing through the heating module, so as to adjust the opening of the adjustable valve so that the bubble content at the heating water outlet meets the requirements. Therefore, the bubble generating system can not only make the bubble content meet the standards, but also keep the water outlet temperature always meeting the requirements, thereby achieving the best use effect for users. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 Schematic diagram of the water path of the bubble generating system in Example 1 of the present invention. DETAILED DESCRIPTION

[0045] The present invention is further described in detail below with reference to the accompanying drawings.

[0046] Embodiment 1:

[0047] like Figure 1 As shown, the bubble generating system in this embodiment includes a bubble generator 1, a heating module 2, a first bubble detecting module 3, a second bubble detecting module 4, an adjustable valve 5 and a controller. The adjustable valve 5 is a valve that can adjust the passing area. The adjustable valve 5 is used to adjust the pressure of the water flow in the heating module 2. When the adjustable valve 2 is closed, the pressure of the water flow increases. In this embodiment, the adjustable valve 5 is a back pressure valve.

[0048] The bubble generator 1 has a water inlet 11, an air inlet 12 and a bubble water outlet 13; the water inlet 11 of the bubble generator 1 is also connected to a raw water inlet pipe b, the air inlet 12 is connected to an air inlet pipe c, and the bubble water outlet 13 of the bubble generator 1 is connected to a water outlet pipe a, gas is introduced into the bubble generator 1 through the air inlet pipe c, and water is introduced into the bubble generator 1 through the raw water inlet pipe b, so that mixing is carried out in the bubble generator 1 to generate bubble water.

[0049] In this embodiment, a booster pump 6 is also provided on the raw water inlet pipe b, and a filter element assembly 7 is also provided on the raw water inlet pipe b, which is located downstream of the booster pump 6. The filter element assembly 7 is generally a filter medium such as PP cotton and activated carbon, and mainly plays a coarse filtering role. The bubble generating system can be applied to a water purifier or a water heater. The heating module 2 is provided on the outlet pipe a connected to the bubble water outlet 13 of the bubble generator 1, and is used to heat the bubble water. In this embodiment, the heating module 2 is a heat exchanger. Of course, it can also be a device capable of heating water, such as a heating tube, a microwave heater, etc.

[0050] The first bubble detection module 3 is used to detect the bubble content between the bubble water outlet 13 of the bubble generator 1 and the water inlet end of the heating module 2; the second bubble detection module 4 is used to detect the bubble content at the water outlet end of the heating module 2; the adjustable valve 5 is arranged on the pipeline between the heating module 2 and the second bubble detection module 4; the controller is connected with the first bubble detection module 3, the second bubble detection module 4, the adjustable valve 5 and the booster pump 6 by electrical signals, and is configured to: according to the detection results of the first bubble detection module 3 and the second bubble detection module 4, the opening of the adjustable valve 5 and the voltage of the booster pump 6 are correspondingly adjusted. In this embodiment, the first bubble detection module 3 and the second bubble detection module 4 are both turbidity sensors. Since microbubbles mixed into the water body will significantly change its light penetration, the turbidity sensor can be used to characterize the content of microbubbles. Of course, other existing sensors such as TDS sensors can also be used.

[0051] It also includes a first temperature sensor 81 for detecting the water temperature at the water outlet of the heating module 2 and a second temperature sensor 82 for detecting the water temperature between the bubble water outlet 13 of the bubble generator 1 and the water inlet of the heating module 2.

[0052] In this embodiment, the control method of the bubble generating system comprises the following steps:

[0053] Step 1, setting the outlet water temperature T of the heating module;

[0054] Step 2: Set the heating power of the heating module to a preset value, and calculate the water outlet flow rate F of the heating module according to the pre-stored relationship between the water outlet temperature and the water outlet flow rate of the heating module;

[0055] Step 3, calculating the opening of the adjustable valve;

[0056] Step 4, calculating the voltage of the booster pump, and starting the booster pump with the voltage;

[0057] Step 5: Detect the outlet water temperature t2 in real time through the first temperature sensor, and determine whether the outlet water temperature t2 is equal to T. If so, proceed to step 6; if not, adjust the voltage of the booster pump through the PID algorithm, and continue to detect the outlet water temperature t2 through the first temperature sensor;

[0058] Step 6: collect the result y1 detected by the first bubble detection module and the result y2 detected by the second bubble detection module in real time, and determine whether y2 is greater than or equal to a*y1, where a is the set bubble-free retention coefficient, 0<a≤1. If yes, proceed to step 7; if not, adjust the opening of the adjustable valve by the PID algorithm, and proceed to step 5;

[0059] Step 7: Save the current voltage of the booster pump and the opening of the adjustable valve and use them as reference data for the next time.

[0060] The opening of the adjustable valve in step 3 and the booster pump voltage in step 4 are calculated as follows:

[0061] Different adjustable valve openings are set in sections, the voltage of the booster pump is adjusted, and the flow rate of the booster pump under different voltages is obtained; and the voltage and adjustable valve opening of the booster pump are obtained according to the water outlet flow rate F.

[0062] In this embodiment, the water flow pressure in the heating module 2 is changed by changing the opening of the adjustable valve 5, thereby maintaining the stability of the micro-nano bubbles in the bubble water. However, due to the increase in water flow pressure, the working pressure of the bubble generator 1 is affected, which will increase the outlet pressure of the booster pump 6, thereby affecting the output flow of the booster pump 6. The relationship is: the adjustable valve 5 opens smaller---the pressure of the bubble generator 1 increases---the output flow of the booster pump 6 decreases; by adjusting the voltage of the booster pump 6, the water output of the booster pump 6 can be adjusted. On the one hand, the flow rate at the outlet of the booster pump 6 can be adjusted to supplement the flow rate after the booster pump 6, and on the other hand, the pressure after the booster pump 6 can be further increased.

[0063] In this embodiment, the turbidity (controlling the microbubble content) and the booster pump output (controlling the flow rate to further control the outlet water temperature) are interactively adjusted at a certain period. The voltage of the booster pump is adjusted first so that the temperature of the bubble water after heat exchange reaches the outlet temperature requirement. Secondly, the opening of the adjustable valve is adjusted to adjust the turbidity so that the turbidity meets the microbubble retention effect. In this way, the dual parameter requirements of turbidity and flow rate are progressively advanced, so that the turbidity (and bubble content meet the standard) can be met, and the temperature can always meet the requirements, so as to achieve the best use effect for users.

[0064] Embodiment 2:

[0065] Different from the first embodiment, the control method of the bubble generating system in this embodiment is characterized by comprising the following steps:

[0066] Step a, setting the water outlet temperature T of the heating module;

[0067] Step b, calculating the opening of the adjustable valve;

[0068] Step c, calculating the voltage of the booster pump, and starting the booster pump with the voltage;

[0069] Step d, adjusting the heating power of the heating module by using a PID algorithm;

[0070] Step e: Detect the outlet water temperature t2 in real time through the first temperature sensor, and determine whether the outlet water temperature t2 is equal to T. If yes, proceed to step f; if not, proceed to step d;

[0071] Step f, adjusting the opening of the adjustable valve by using a PID algorithm;

[0072] Step g, real-time acquisition of the result y1 detected by the first bubble detection module and the result y2 detected by the second bubble detection module, and determination of whether y2 is greater than or equal to a*y1, where a is the set bubble-free retention coefficient, 0<a≤1, if yes, proceed to step h; if no, proceed to step f;

[0073] Step h, judging whether the heating power of the heating module reaches the maximum value Pmax, if yes, proceeding to step i; if no, adjusting the voltage of the booster pump by the PID algorithm, and proceeding to step e;

[0074] Step i: save the current voltage of the booster pump, the opening of the adjustable valve and the heating power of the heating module, and use them as reference data for the next time.

[0075] In this embodiment, the turbidity and the booster pump output (i.e., flow rate) are interactively adjusted according to a certain period, and the turbidity is adjusted first. That is, first, according to the deviation of the turbidity and the PID parameter of the turbidity, the opening of the adjustable valve is adjusted. After the adjustable valve is adjusted, the turbidity will change, and the output flow rate of the booster pump will also change. At this time, the output flow rate of the booster pump is adjusted (generally smaller), and the heating power of the heating module will decrease. At this time, the output power of the booster pump is further increased. After the heating power of the heating module is stable, the turbidity is adjusted again. In this way, the cycle will be performed in sequence, and the dual parameter requirements of turbidity and flow rate will be progressively advanced in sequence, so as to meet the turbidity and maximize the flow rate, and achieve the best use effect for users.

Claims

1. A bubble generating system, comprising: The bubble generator (1) has a water inlet (11), an air inlet (12) and a bubble water outlet (13); A heating module (2) is arranged on a water outlet pipe (a) connected to a bubble water outlet (13) of the bubble generator (1); The invention is characterized in that it also includes: A first bubble detection module (3) is used to detect the bubble content between the bubble water outlet (13) of the bubble generator (1) and the water inlet end of the heating module (2); A second bubble detection module (4) is used to detect the bubble content at the water outlet of the heating module (2); An adjustable valve (5) is arranged on the pipeline between the heating module (2) and the second bubble detection module (4); The controller is electrically connected to the first bubble detection module (3), the second bubble detection module (4) and the adjustable valve (5), and is configured to adjust the opening of the adjustable valve (5) accordingly according to the detection results of the first bubble detection module (3) and the second bubble detection module (4).

2. The bubble generating system according to claim 1, characterized in that: The water inlet (11) of the bubble generator (1) is also connected to a raw water inlet pipe (b), and the raw water inlet pipe (b) is also provided with a booster pump (6) connected to a controller, and the controller is further configured to adjust the voltage of the booster pump (6) accordingly according to the detection results of the first bubble detection module (3) and the second bubble detection module (4).

3. The bubble generating system according to claim 2, characterized in that: The raw water inlet pipe (b) is also provided with a filter element assembly (7) located downstream of the booster pump (6).

4. The bubble generating system according to claim 2, characterized in that: It also includes a first temperature sensor (81) for detecting the water temperature at the water outlet of the heating module (2).

5. The bubble generating system according to claim 4, characterized in that: It also includes a second temperature sensor (82) for detecting the water temperature between the bubble water outlet (13) of the bubble generator (1) and the water inlet end of the heating module (2).

6. The bubble generating system according to claim 4 or 5, characterized in that: The heating module (2) is a heat exchanger.

7. The bubble generating system according to claim 4 or 5, characterized in that: The first bubble detection module (3) and the second bubble detection module (4) are both turbidity sensors.

8. The bubble generating system according to claim 4 or 5, characterized in that: The adjustable valve (5) is a back pressure valve.

9. A control method for a bubble generating system as claimed in any one of claims 4 to 8, characterized in that The steps include: Step 1, setting the outlet water temperature T of the heating module; Step 2: Set the heating power of the heating module to a preset value, and calculate the water outlet flow rate F of the heating module according to the pre-stored relationship between the water outlet temperature and the water outlet flow rate of the heating module; Step 3, calculating the opening of the adjustable valve; Step 4, calculating the voltage of the booster pump, and starting the booster pump with the voltage; Step 5: Detect the outlet water temperature t2 in real time through the first temperature sensor, and determine whether the outlet water temperature t2 is equal to T. If so, proceed to step 6; if not, adjust the voltage of the booster pump through the PID algorithm, and continue to detect the outlet water temperature t2 through the first temperature sensor; Step 6: collect the result y1 detected by the first bubble detection module and the result y2 detected by the second bubble detection module in real time, and determine whether y2 is greater than or equal to a*y1, where a is the set bubble-free retention coefficient, 0<a≤1. If yes, proceed to step 7; if not, adjust the opening of the adjustable valve by the PID algorithm, and proceed to step 5; Step 7: Save the current voltage of the booster pump and the opening of the adjustable valve and use them as reference data for the next time.

10. The control method according to claim 9, characterized in that: The calculation method of the opening of the adjustable valve in step 3 and the booster pump voltage in step 4 is: Different adjustable valve openings are set in sections, the voltage of the booster pump is adjusted, and the flow rate of the booster pump under different voltages is obtained; and the voltage and adjustable valve opening of the booster pump are obtained according to the water outlet flow rate F.

11. A control method for a bubble generating system as claimed in any one of claims 4 to 8, characterized in that The steps include: Step a, setting the water outlet temperature T of the heating module; Step b, calculating the opening of the adjustable valve; Step c, calculating the voltage of the booster pump, and starting the booster pump with the voltage; Step d, adjusting the heating power of the heating module by using a PID algorithm; Step e: Detect the outlet water temperature t2 in real time through the first temperature sensor, and determine whether the outlet water temperature t2 is equal to T. If yes, proceed to step f; if not, proceed to step d; Step f, adjusting the opening of the adjustable valve by using a PID algorithm; Step g, real-time acquisition of the result y1 detected by the first bubble detection module and the result y2 detected by the second bubble detection module, and determination of whether y2 is greater than or equal to a*y1, where a is the set bubble-free retention coefficient, 0<a≤1, if yes, proceed to step h; if no, proceed to step f; Step h, judging whether the heating power of the heating module reaches the maximum value Pmax, if yes, proceeding to step i; if no, adjusting the voltage of the booster pump by the PID algorithm, and proceeding to step e; Step i: save the current voltage of the booster pump, the opening of the adjustable valve and the heating power of the heating module, and use them as reference data for the next time.

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