CN108603323B - Washing article nursing device with pump driving and controlling device - Google Patents
Washing article nursing device with pump driving and controlling device Download PDFInfo
- Publication number
- CN108603323B CN108603323B CN201680080694.1A CN201680080694A CN108603323B CN 108603323 B CN108603323 B CN 108603323B CN 201680080694 A CN201680080694 A CN 201680080694A CN 108603323 B CN108603323 B CN 108603323B
- Authority
- CN
- China
- Prior art keywords
- pump
- pressure
- washing liquid
- line
- laundry care
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0072—Installation or systems with two or more pumps, wherein the flow path through the stages can be changed, e.g. series-parallel
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00
- D06F39/08—Liquid supply or discharge arrangements
- D06F39/083—Liquid discharge or recirculation arrangements
- D06F39/085—Arrangements or adaptations of pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D9/00—Priming; Preventing vapour lock
- F04D9/001—Preventing vapour lock
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/44—Current or voltage
- D06F2103/48—Current or voltage of the motor driving the pump
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F33/00—Control of operations performed in washing machines or washer-dryers
- D06F33/30—Control of washing machines characterised by the purpose or target of the control
- D06F33/47—Responding to irregular working conditions, e.g. malfunctioning of pumps
Abstract
The invention relates to a laundry care appliance (100) having a pump (115) for pumping washing liquid and a pump control device (135) for controlling the first and second pump motors (131,133), wherein the pump (115) has a suction chamber (117) having a suction connection (113) for fluidic connection to a suction line (111), a first pressure chamber (119) having a first pressure connection (121) for fluidic connection to a first pressure line (123), and a second pressure chamber (125) having a second pressure connection (127) for fluidic connection to a second pressure line (129), and wherein the pump (115) has a first pump motor (131) for pumping washing liquid from the first pressure chamber (119) by means of the first pressure line (123) in a first delivery flow (137) and a second pump motor (131) for pumping washing liquid from the second pressure line (129) in a second delivery flow (143) from the second pressure chamber (119) in a second delivery flow (143) (125) A second pump motor (133) for pumping the washing liquid. The pump control device (135) is designed to: one of the two pump motors (131,133) is activated in an activation time interval in order to pump washing liquid from the associated pressure chamber (119,125) with the associated delivery flow (137,143) from the associated pressure line (123, 129). The pump control device (135) is designed to: during the activation time interval, the other of the two pump motors (131,133) is activated in order to pump washing liquid from the associated pressure chamber (119,125) from the associated pressure line (123,129) until a maximum washing liquid level (139) in the associated pressure line (123,129) is reached in order to prevent air from being sucked in by the associated pressure line (123, 129).
Description
Technical Field
The invention relates to a laundry care appliance having a pump drive for a recirculating pumping system.
Background
Conventional laundry care appliances with a high loading capacity usually have a circulating pumping system by means of which the washing liquid can be pumped out of the lye container and then fed back into the lye container. Conventional laundry care appliances also have a pump-out system in order to remove the washing liquor from the laundry care appliance after the laundry care process. For both circulation pumping systems and pumping-out systems, pumps are required to ensure efficient circulation pumping of washing liquid in or out of the laundry care appliance.
DE 3825502 a1 discloses a washing machine with a lye pump equipped with a drive motor which is controlled by an electronic circuit.
In EP 2009165 a1 a pump for a washing machine is disclosed, which is controlled in dependence of the water level detected by a pressure switch.
In WO 2011/147009 a2 a self-cleaning filter for a washing machine is disclosed.
A fluid control system for a dishwasher is disclosed in US 3542594 a.
Disclosure of Invention
The object of the present invention is to provide a laundry care appliance having a pump which enables efficient pumping of washing liquid in the laundry care appliance.
According to one aspect, the object is achieved according to the invention by a laundry care appliance having a pump for pumping washing liquid, wherein the pump has: a suction chamber equipped with a suction connection for a fluidic connection to a suction line; a first pressure chamber provided with a first pressure connection for a fluidic connection to the first pressure line; and a second pressure chamber, which is provided with a second pressure connection for the fluidic connection to a second pressure line, wherein the pump has: a first pump motor for pumping washing liquid from the first pressure chamber through the first pressure line in a first delivery flow; and a second pump motor for pumping washing liquid from the second pressure chamber via the second pressure line at a second delivery flow, the laundry care appliance further having a pump drive for controlling the first and second pump motors, wherein the pump drive is configured for: activating one of the two pump motors during an activation time interval in order to pump the washing liquid from the associated pressure chamber via the associated pressure line with the associated delivery flow, and wherein the pump control device is designed to: during an activation time interval, the other of the two pump motors is activated in order to pump washing liquid from the associated pressure chamber through the associated pressure line until a maximum washing liquid level in the associated pressure line is reached in order to prevent air from being sucked in through the associated pressure line.
This achieves the technical advantage that: by simultaneously activating the two pump motors by the pump control device during the activation time interval, it is possible to prevent: air may be sucked in by the further pressure line (the inactive pressure line). During the activation time interval, the washing liquid is pumped by the pressure line of one of the two pressure lines (active pressure line) by the feed pump, and the washing liquid is pumped by the pressure line of the other of the two pressure lines (inactive pressure line) until the maximum washing liquid level in the inactive pressure line is reached or only the feed pressure is built up, without a continuous feed flow occurring, i.e. in turn only the water column in the inactive pressure line is raised, in order to prevent suction of air, which air may interrupt or reduce the feed flow in the active pressure line. Thus, in the other of the two pressure lines (inactive pressure line), there is no flow of washing liquid and only the washing liquid is lifted until the maximum washing liquid level in the inactive pressure line is reached. The maximum washing liquid level that occurs is sufficient to prevent air from being sucked in via the inactive pressure line, while at the same time the pump-out process or the circulation pump process is carried out via the active (aktiven) pressure chamber and the active pressure line. This means in particular that: the two pump motors are always switched on, one for ensuring pump operation (pumping out or circulating pumping) and the other for preventing air intake via the inactive (intake) pressure line.
In conventional laundry care appliances having a pump with two pressure chambers, for example, in the case of a small level of washing liquid in the lye container, in the case of a large feed flow (which generates a large flow velocity in the case of a small flow cross section), air can be sucked in through the inactive pressure chamber. By sucking in air from the inactive pressure space, the delivery flow of the pump may be interrupted for a short time and then resumed, thereby generating a pulsed delivery flow of the pump. The pulsed delivery flow from the pump results in a reduction in the delivery flow over time (i.e. limited or impaired performance), increased load on the pump components and a higher load on the user due to the intense pulsed high noise level.
In contrast, in the pump according to the invention, by simultaneously activating the two pump motors mentioned above it is possible to ensure that: in the case of a washing lye feed through one of the two pressure lines (active pressure line, in particular the pump-out line or the circulating pump line), a constant feed flow of washing liquor can be established in the pump-out line or the circulating pump line. However, the two pump motors are driven by pump drives having different rotational speeds, so that in the other (inactive) of the two pressure lines, the washing liquid is pumped only up to the maximum washing liquid level, and thus no flow is formed in the inactive pressure line. The maximum washing liquid level in the inactive pressure line is sufficient to prevent air from being sucked in through the inactive pressure line.
By a laundry care appliance is understood an appliance for laundry care, for example a washing machine or a laundry dryer. Such a laundry care appliance is understood to mean, in particular, a household laundry care appliance. Namely, such laundry care appliances: the laundry care appliance is used in the household sector and, with the aid of the laundry care appliance, treats household-normal amounts of laundry.
In an advantageous embodiment of the laundry care appliance, the laundry care appliance comprises a lye container for receiving washing liquid, wherein the washing liquid in the lye container has a container level, wherein the height of the maximum washing liquid level in the associated pressure line is at least as great as the height of the container level of the washing liquid in the lye container.
This achieves the technical advantage that: by the height of the maximum washing liquid level in the inactive pressure line (which is greater than the height of the container level of the washing liquid in the lye container) it is ensured to a sufficient extent that: no air is sucked in due to the column of washing liquid present in the pressure line.
In a further advantageous embodiment of the laundry care appliance, the laundry care appliance comprises a lye container for receiving washing liquor and a pressure sensor for detecting a pressure exerted by the washing liquor on the lye container, wherein the lye container is fluidically connected to the suction line, and wherein the pump drive is configured to: the rotational speed of the pump motors is controlled as a function of the detected pressure in order to prevent air from being sucked in via the associated pressure line.
The advantages of such a technique are thereby achieved: by controlling the rotational speed of these pump motors in dependence on the detected pressure, the pump power of the pump can be effectively adjusted in dependence on the liquid level of the washing liquid in the lye container. It can thereby be ensured that in the event of a drop in the liquid level of the washing liquid in the lye container, the conveying flow of the pumped washing liquid can be reduced, whereby air is prevented from possibly being sucked in from the inactive pressure line. This is an advantageous method for controlling the pump drive of a recirculating pumping system, it being particularly advantageous if the two pump drives can be operated in a control-related manner at different times. The case is then also included: in the drive control technology, a pump inverter (pumpenverter) is used alternately for the two pump drives.
In a further advantageous embodiment of the laundry care appliance, the pump control device is designed to: when the detected pressure is below a predetermined pressure threshold, the rotational speed of the pump motors is reduced.
This achieves the technical advantage that: it can be ensured that in the event of a drop in the level of washing liquid in the lye container, air is prevented from being sucked in from the inactive pressure line.
In a further advantageous embodiment of the laundry care appliance, the pump control device is designed to: during the above-mentioned activation time interval, the first pump motor is activated in order to pump washing liquid out of the first pressure chamber via the first pressure line at a first delivery flow, and the pump control device is designed to: during the above-mentioned activation time interval, the second pump motor is activated in order to pump washing liquid from the second pressure chamber until a maximum washing liquid level in the second pressure line is reached.
This achieves the technical advantage that: by simultaneously activating the two pump motors by the pump control device during the activation time interval, it is ensured that: the washing liquid can be pumped efficiently through the first pressure line with a first delivery flow and: by sucking air through a second (inactive) pressure line. However, with such a pump drive configuration, a separate and independent pump inverter must be provided for each pump drive in terms of design, which at the respective time in the presence of the above-mentioned lye container wash water level presets the respective rotational speed level for the respective pump.
In a further advantageous embodiment of the laundry care appliance, the first pressure chamber comprises a pump-out pressure chamber, the first pressure connection comprises a pump-out pressure connection, and the first pressure line comprises a pump-out line, wherein the first pump motor is configured to: during the activation time interval, the washing liquid is pumped out of the washing care appliance from the pump-out pressure chamber through the pump-out line in a pump-out delivery flow.
This achieves the technical advantage that: during the first activation time interval, the first pump motor is activated, so that an effective pumping of the washing liquid out of the washing care appliance from the pump-out pressure chamber through the pump-out line is ensured.
In a further advantageous embodiment of the laundry care appliance, the pump control device is designed to: in a further activation time interval, a second pump motor is activated for pumping washing liquid from the second pressure chamber through the second pressure line in a second delivery flow, and the pump control device is designed to: in a further activation time interval, the first pump motor is activated in order to pump washing liquid from the first pressure chamber until a maximum washing liquid level in the first pressure line is reached.
This achieves the technical advantage that: by simultaneously activating the two pump motors independently of the rotational speed by the pump drive in a further activation time interval, it is ensured that: the washing liquid can be pumped efficiently through the second pressure line with the second delivery flow or the column of washing liquid is lifted by the delivery pressure and air is prevented from being sucked in through the first pressure line.
In a further advantageous embodiment of the laundry care appliance, the second pressure chamber comprises a circulation pumping pressure chamber, the second pressure connection comprises a circulation pumping pressure connection, and the second pressure line comprises a circulation pumping line, wherein the second pump motor is configured to: during a further activation time period, the washing liquid is pumped cyclically from the circulation pumping pressure chamber into the laundry care appliance through the circulation pumping line in a circulation pumping feed flow.
This achieves the technical advantage that: in a further activation time interval, the activation of the second pump motor ensures that: the washing liquid is pumped from the circulation pumping pressure chamber through the circulation pumping line into the laundry care appliance in an effective manner.
In a further advantageous embodiment of the laundry care appliance, the laundry care appliance comprises a lye container to which the suction line and the circulation pump line are respectively fluidically connected, wherein the second pump motor is designed to: the washing liquid is pumped out of the lye container through the suction line and the pumped-out washing liquid is re-pumped into the lye container through the circulating pumping line in a circulating pumping transport stream.
This achieves the technical advantage that: by connecting the suction line and the circulation pumping line to the fluid-technical side of the lye container, an effective circulation pumping of the washing liquid is ensured.
In a further advantageous embodiment of the laundry care appliance, the suction nozzle has a first nozzle diameter, the first pressure nozzle has a second nozzle diameter, and the second pressure nozzle has a third nozzle diameter, wherein the first nozzle diameter is greater than the second nozzle diameter and/or greater than the third nozzle diameter.
This achieves the technical advantage that: by means of the large first nozzle diameter of the suction nozzle, a large flow cross section is achieved on the suction side, and thus a slower flow speed occurs on the suction side. This makes it possible to achieve a small pressure loss on the suction side and thus a higher suction pressure than would be possible at relatively high flow speeds, thereby making the air suction structurally difficult.
In a further advantageous embodiment of the laundry care appliance, the suction line has a first line diameter, the first pressure line has a second line diameter, and the second pressure line has a third line diameter, wherein the first line diameter is greater than the second line diameter and/or greater than the third line diameter.
This achieves the technical advantage that: by means of the large first line diameter of the suction line, a large flow cross section on the suction side is achieved, and a slower flow speed is thereby established on the suction side. This makes it possible to achieve a low pressure loss on the suction side and thus to generate a higher suction pressure than would be possible at relatively high flow speeds, thereby making the air suction structurally difficult.
In a further advantageous embodiment of the laundry care appliance, the first and second pump motors each have a first and second rotary wheel, wherein the first pump motor is configured to: driving the first rotating wheel in a rotational direction for pumping the washing liquid from the first pressure chamber, and wherein the second pump motor is configured for: the second rotating wheel is driven in a rotational direction for pumping washing liquid from the second pressure chamber.
This achieves the technical advantage that: efficient pumping of the washing liquid from the first or second pressure chamber is achieved by a pump motor having a rotating wheel.
In a further advantageous embodiment of the laundry care appliance, the first or second pump motor comprises an electric motor, in particular a brushless direct current motor (B L DC motor), or a permanently energized, brushless synchronous drive.
This achieves the technical advantage that a particularly efficient, variable-speed pump operation can be ensured by an electric motor, in particular a brushless direct current motor (B L DC motor), or a synchronous drive.
In a further advantageous embodiment of the laundry care appliance, the laundry care appliance comprises a power detection element for detecting an electrical power value of the first or second pump motor, the pump drive and control device being configured to: the delivery pressure and/or the delivery flow of the washing liquid in the first or second pressure line is determined as a function of the detected power value, and the pump control device is designed to: the rotational speed of the first or second pump motor is varied as a function of the determined delivery pressure and/or delivery flow.
This achieves the technical advantage that: the rotational speed of the first or second pump motor can be adapted to the delivery pressure of the washing liquid in the first or second pressure line. During the pumping-out process, the delivery pressure of the washing liquid can be correlated, for example, to the positioning of the outlet hose (in particular the height of the outflow opening of the outlet hose on the outside of the laundry care appliance). The user of the laundry care appliance can, for example, position the outflow opening of the discharge hose on the floor of the accommodation space of the laundry care appliance, whereby a low delivery pressure is required for pumping out the washing liquid. Alternatively, the user of the laundry care appliance can position the outflow opening of the drain hose in an elevated position relative to the laundry care appliance, as a result of which an elevated delivery pressure occurs. By detecting the value of the electric power of the first or second pump motor, the delivery pressure of the washing liquid can be determined and the rotational speed of the first or second pump motor can be changed accordingly. For this purpose, the pump control device can have, in particular, reference data (operating point data characteristic map) which have been determined beforehand during the appliance design phase for different delivery pressures of the laundry care appliance. Thereby, an optimum rotational speed of the pump motors may be set in dependence of the determined delivery pressure, thereby preventing: in the case of different delivery pressures, air is sucked in via the inactive pressure connection (or pressure line). The interrelationships between the different operating points (rotational speed, drive output, delivery pressure or delivery height and delivery flow) are summarized in one go in the form of a system design of the recirculating pumping system in a characteristic curve and subsequently stored in the pump control.
According to a second aspect of the invention, the object is achieved by a method for pumping washing liquor in a laundry care appliance comprising a pump for pumping washing liquor, wherein the pump has: a suction chamber equipped with a suction connection for a fluidic connection to a suction line; a first pressure chamber provided with a first pressure connection for a fluidic connection to the first pressure line; and a second pressure chamber, which is provided with a second pressure connection for the fluidic connection to a second pressure line, and the pump has: a first pump motor for pumping washing liquid from the first pressure chamber through the first pressure line with a first delivery flow; and a second pump motor for pumping washing liquid from the second pressure chamber through the second pressure line at a second delivery flow, and the laundry care appliance comprising pump drive means for controlling the first and second pump motors, wherein the method comprises: during an activation time interval, one of the two pump motors is activated by the pump control device for pumping washing liquid from the associated pressure chamber through the associated pressure line with the associated delivery flow, and the method comprises: in the activation time interval, the other of the two pump motors is activated by the pump control device in order to pump the washing liquid from the associated pressure chamber through the associated pressure line until a maximum washing liquid level in the associated pressure line is reached in order to prevent air from being sucked in through the associated pressure line.
This achieves the technical advantage that: by activating the other of the two pump motors during the activation time interval it is ensured that: no air is sucked in through the other of the two pressure lines (inactive pressure line), whereby it can be ensured that the pump operates efficiently with a constant delivery flow of the pump.
For such a control concept for a recirculating pump system, in which the two pump drives must be operated simultaneously, two pump control inverters must also be provided, which independently regulate the rotational speed and the load for the different drives. If the drive control scheme for a recirculating pumping system provides only one common pump drive inverter, the pumps can only be operated sequentially. In order to prevent "secondary air" (nebenloft) from being drawn in via the inactive pressure line of the circulating pumping system for this pump control design too, therefore, a pump regulation, which is dependent on the lye container level and in which the feed flow is adapted to avoid "secondary air" being drawn in via the inactive pressure line, must be carried out.
Drawings
Further embodiments are explained with reference to the figures. The figures show:
FIG. 1: a schematic view of a laundry care appliance;
FIG. 2: a schematic view of a laundry care appliance with a pump;
FIG. 3: a schematic view of a laundry care appliance with a pump;
FIG. 4: a schematic illustration of the washing liquid feed flow occurring in the throttle curve test stand for the detection of the characteristic curve; and
FIG. 5: a process for pumping a washing liquid in a laundry care appliance.
Detailed Description
Fig. 1 shows a schematic view of a generic laundry care appliance 100, for example a washing machine. The laundry care appliance 100 comprises a rinsing housing 101, into which rinsing housing 101 a laundry care substance (e.g. a detergent) can be injected. The laundry care appliance 100 comprises a door 103 for loading the laundry care appliance 100 with laundry.
Fig. 2 shows a schematic view of a laundry care appliance with a pump. The laundry care appliance 100 comprises a lye container 105 for receiving washing liquor, which lye container 105 comprises an inlet opening 107 and an outlet opening 109. The inlet opening 107 is fluidically connected to a suction line 111, which suction line 111 is fluidically connected to a pump 115 (in particular to a suction chamber 117 of the pump 115) via a suction connection 113. Furthermore, the pump 115 has a first pressure chamber 119 (in particular a pump-out pressure chamber), which first pressure chamber 119 is fluidically connected to a first pressure line 123 (in particular a pump-out line) via a first pressure connection 121 (in particular a pump-out pressure connection). The pump 115 furthermore has a second pressure chamber 125 (in particular a circulating pumping pressure chamber), which second pressure chamber 125 is fluidically connected to a second pressure line 129 (in particular a circulating pumping line) via a second pressure connection 127 (in particular a circulating pumping pressure connection).
The pump 115 furthermore has a first pump motor 131 for pumping washing liquid out of the first pressure chamber 119 into the first pressure line 123. The pump 115 furthermore has a second pump motor 133 for pumping washing liquid out of the second pressure chamber 125 into the second pressure line 129. Furthermore, the pump 115 has a pump control device 135, which pump control device 135 is designed to: the first and second pump motors 131,133 are controlled.
In the illustration shown in fig. 2, the pump control 135 activates the first pump motor 131 in order to pump washing liquid from the first pressure chamber 119 through the first pressure line 123 (in particular the outlet line) in a first feed flow 137 out of the laundry care appliance 100. Thereby, washing liquid can be pumped from the lye container 105 through the outlet opening 109 and through the suction line 111 into the suction chamber 117 of the pump 115, and the pumped-out washing liquid can be pumped out of the laundry care appliance 100 from the suction chamber 117 through the first pressure chamber 119 and through the first pressure line 123 in the first feed flow 137.
Furthermore, the pump control 135 activates the second pump motor 133 in order to pump (or lift) the washing liquid from the second pressure chamber 125 via the second pressure line 129 (in particular the circulation pump line) until a maximum washing liquid level 139 in the second pressure line 129 is reached. The pump control 135 controls the second pump motor 133 in such a way that, in particular, the maximum washing liquid level 139 is higher than the container level 141 of the washing liquid in the lye container 105. By the maximum washing liquid level 139 present in the second pressure line 129, it is prevented that: during the pumping of the washing liquid through the first pressure line 123 in the first feed stream 137, air is sucked in from the lye container 105 through the second pressure line 129.
Fig. 3 shows a schematic view of the laundry care appliance according to fig. 2 with a pump. The laundry care appliance 100 comprises a pump 115 having a suction chamber 117 and having a suction connection 113, the suction connection 113 being fluidically connected via a suction line 111 to the outlet opening 109 of the lye container 105 of the laundry care appliance 100. The pump 115 furthermore has a first pump motor 131 for pumping the rinsing liquid from the first pressure chamber 119 through the first pressure connection 121 into the first pressure line 123. The pump 115 furthermore has a second pump motor 133 for pumping the rinsing liquid from the second pressure chamber 125 via the second pressure connection 127 into the second pressure line 129. Furthermore, the pump 115 has a pump control device 135, which pump control device 135 is designed to: the first and second pump motors 131,133 are controlled.
In the illustration shown in fig. 3, the pump control 135 activates the second pump motor 133 in order to circulate washing liquid from the second pressure chamber 125 via the second pressure line 129 (in particular the circulation pumping line) into the laundry care appliance 100 in a second delivery flow 143. Thereby, washing liquid is pumped from the lye container 105 through the discharge opening 109 and through the suction line 111 into the suction chamber 117 of the pump 115, and the pumped-out washing liquid is pumped out of the laundry care appliance 100 from the suction chamber 117 through the second pressure chamber 125 and through the second pressure line 129 in a second feed flow 143.
Furthermore, the pump control 135 activates the first pump motor 131 in order to pump (or lift) the washing liquid from the first pressure chamber 119 until a maximum washing liquid level 139 in the first pressure line 123 (in particular the discharge line) is reached. The pump control 135 controls the first pump motor 131 in such a way that the maximum washing liquid level 139 is higher than the container level 141 of the washing liquid in the lye container 105, but no continuous flow occurs. By the maximum washing liquid level 139 present in the first pressure line 123, it is prevented that: during the pumping of the washing liquid through the second pressure line 129 in the second delivery flow 143, air is sucked in from outside the laundry care appliance 100 through the first pressure line 123.
The simultaneous control of the two pump motors 131,133 thus compensates for the suction pressure prevailing in the respective inactive pressure connection 121,127, so that only in the assigned inactive pressure lines 123,129 a static water column with a maximum washing liquid level 139 is formed, wherein the maximum washing liquid level 139 is formed at least at the same level as the container level 141 in the lye container 105. The pump speed of the first or second pump motor 131,133 is set by the pump control 135 in such a way that the water column in the inactive pressure line 123,129 is raised, whereas no feed flow 137,143 of the washing liquid occurs in the inactive pressure line 123,129, but the washing liquid is only fed until a maximum washing liquid level 139, which is determined by the pump speed, is reached. That is, the delivery pressure is built up only in the case of a low power demand, but a continuous pump delivery flow is not yet generated.
Furthermore, a pressure sensor for detecting the pressure exerted by the washing liquid on the lye container 105 can be arranged in the lye container 105. The adjustment of the rotational speed of the pump motors 131,133 by the pump control 135 can be carried out by means of the pressure sensors as a function of the detected pressure and as a function of the washing liquid level in the lye container detected thereby, so that, in the event of a drop in the container level 141 on the suction side in the lye container 105, the feed flow 137,143 of the washing liquid in the active pressure lines 123,129 is reduced, whereby no air can be sucked in from the inactive pressure line 123,139.
In order to minimize the risk of air suction, the flow cross sections of the suction connection 113 and of the suction line 111 are dimensioned sufficiently large, so that small flow velocities and thus small suction-side pressure losses and thus small suction pressures result, which make it structurally difficult to conditionally suck in air.
The adjustment of the pump speed by the pump control 135 can additionally be carried out in software as a self-learning function (selbstlerndende function) or can be preset by a family of pump characteristic curves formed by different operating points, which have been established in the design phase. Through the various washing cycles performed in advance, the rotational speed setpoint variable can be adapted to the subsequent washing process as a function of the pump gradient (Pumpgradienten) achieved. The detection is performed when the edge condition has changed and air is sucked in with the edge condition having changed. Thereby, a preprogrammed change in programming technology can be performed, for example, to be able to react to an effect determined by the service life, for example, a reduction in the flow cross section over the service life due to deposits, which results in a higher pressure loss on the suction side and promotes the intake of air. In this way, all possible rotational speed curves need not be plotted before the production of the appliance (i.e. in the design phase), and, in addition, the respective setting conditions of the washing appliance, for example at the user, can be taken into account together in the rotational speed control.
The measures according to the invention ensure that: during the pumping or circulation pumping, a feed flow 137,143 of the washing liquid is always formed in the active pressure lines 123,129, without air being sucked in via the inactive pressure lines 123,129, and the feed flow 137,143 is not reduced by the two-phase portion (zweiphasigen Anteile) of the washing liquid and air. In this way, temporally short pumping program steps can be realized, which have a positive effect on the duration of the specific wash care program. In the case of the delivery of a two-phase mixture (i.e. a mixture consisting of washing liquid and air), demanding tasks arise for the pump speed regulation. A brief increase or decrease in the rotational speed of the pump 115 during the delivery of the two-phase mixture occurs, which means an increased component load, which is to be avoided. Additionally, if air is sucked in during the conveying, disturbing operating noises are generated as a result of the conveying of the two-phase mixture. In particular, the short cycle duration, in which air is alternately sucked in, can strongly detract from the subjective noise perception.
It is additionally conceivable to develop further methods and other methods for self-cleaning, which are able to derive beneficial effects from the simultaneous operation of the two drives in the recirculating pumping system, for example for foreign body detection and foreign body elimination.
Fig. 4 shows a schematic representation of the washing liquid feed flow occurring in the throttle curve test stand for characteristic curve detection. Fig. 4 shows a diagram of the transport flow over time in liters/minute, the transport flow being plotted as a function of time along the ordinate axis 145, the time being indicated in seconds along the abscissa axis 147.
The first curve 149 shows: the profile of the feed flow 137 of the washing liquid in the first pressure line 123 (or pump-out line) with the intake of air via the inactive pressure connection 127 and via the inactive second pressure line 129. If the pump 115 is operated, for example, with a low tank level, air is sucked in from the inactive second pressure line 129 (recirculating pumping line) with a high delivery flow (which, with a low flow cross section, would generate a high flow velocity), so that the delivery flow 137 of the pump 115 is interrupted for a short time and then occurs again. In the course of the first curve 149, the pulsed transport flow 137 of the washing liquid becomes evident, wherein the inertia of the washing liquid acts in a damped manner.
The second curve 151 shows: the profile of the feed flow 137 of the washing liquid in the first pressure line 123 (or pump-out line) in the sense of the present invention, when no air is sucked in through the inactive pressure connection 127 and through the inactive second pressure connection 129. Since there is a maximum washing liquid level 139 in the inactive pressure line 129, the pump 115 can be operated even at very low tank levels, without air being sucked in from the inactive second pressure line 129 (circulating pumping line). Thus, as shown in fig. 4, in the event of an increase in the supply flow 137 of washing liquid in the first pressure line 123 (or pump-out line), no air can be drawn in from the inactive second pressure line 129. The feed flow 137 of the washing liquid in the second pressure line 129 is thereby not interrupted, but remains constant.
Fig. 5 shows a flow of a method 200 for pumping washing liquid in a laundry care appliance 100, which is described with reference to fig. 2 and 3. As a first method step, the method comprises: during the activation time interval, one of the two pump motors 131,133 described above is activated 201 by the pump control device 135 in order to pump washing liquid from the associated pressure chamber 119,125 via the associated pressure line 123,129 with the associated feed flow 137,143. As a second method step, the method comprises: in the activation time interval, the other of the two pump motors 131,133 is activated 203 by the pump control device 135 in order to pump washing liquid through the associated pressure lines 123,129 from the associated pressure chamber 119,125 with the associated supply flow 137,143, in order to pump washing liquid from the associated pressure chamber 119,125 through the associated pressure lines 123,129 until a maximum washing liquid level 139 in the associated pressure lines 123,129 is reached, in order to prevent air from being sucked in through the associated pressure lines 123, 129.
All features explained and illustrated in conjunction with the individual embodiments of the invention can be provided in different combinations in the subject matter according to the invention to achieve their advantageous effects at the same time.
The scope of protection of the invention is provided by the claims and is not limited by the features explained in the description or shown in the drawings.
List of reference numerals
100 washing nursing device
101 punch-in shell
103 door
105 lye container
107 input opening
109 discharge opening
111 suction line
113 suction connection
115 pump
117 suction lumen
119 first pressure chamber
121 first pressure connection pipe
123 first pressure line
125 second pressure chamber
127 second pressure connection
129 second pressure line
131 first pump motor
133 second pump motor
135 pump driving and controlling device
137 first transport stream
139 maximum level of washing liquid
141 container level
143 second transport stream
145 ordinate axis
147 axis of abscissa
149 first curve
151 second curve
200 method for pumping washing liquid in a laundry care appliance
201 activating one of the two pump motors during an activation time interval
203 activating the other of the two pump motors during said activation time period
Claims (16)
1. A laundry care appliance (100) comprising a pump (115) for pumping washing liquid,
wherein the pump (115) has:
a suction chamber (117) having a suction connection (113) for fluidically connecting to a suction line (111),
-a first pressure chamber (119) having a first pressure connection (121) for fluid-technical connection to a first pressure line (123), and
a second pressure chamber (125) having a second pressure connection (127) for fluid-technical connection to a second pressure line (129), and
wherein the pump (115) has:
-a first pump motor (131) for pumping washing liquid from the first pressure chamber (119) through the first pressure line (123) in a first delivery flow (137), and
-a second pump motor (133) for pumping washing liquid from the second pressure chamber (125) through the second pressure line (129) in a second delivery flow (143),
the laundry care appliance comprising a pump drive device (135) for controlling the first pump motor (131) and the second pump motor (133),
it is characterized in that the preparation method is characterized in that,
the pump control device (135) is designed to: during an activation time interval, one of the two pump motors (131,133) is activated in order to pump washing liquid from the associated pressure chamber (119,125) through the associated pressure line (123,129) with the associated delivery flow (137,143), and
the pump control device (135) is designed to: in the activation time interval, the other of the two pump motors (131,133) is activated in order to pump washing liquid from the associated pressure chamber (119,125) through the associated pressure line (123,129) until a maximum washing liquid level (139) in the associated pressure line (123,129) is reached in order to prevent air from being sucked in through the associated pressure line (123,129), and
wherein the pump control device (135) is further configured to: controlling the rotational speed of the first pump motor (131) and the second pump motor (133).
2. Laundry care appliance (100) according to claim 1,
it is characterized in that the preparation method is characterized in that,
the laundry care appliance (100) has a lye container (105) for receiving washing liquor,
wherein the washing liquid in the lye container (105) has a container fill level (141),
wherein the pump control device (135) is designed to: the two pump motors (131,133) are controlled such that the maximum washing liquid level (139) in the associated pressure lines (123,129) is at least as high as the container level (141) of the washing liquid in the lye container (105).
3. The laundry care appliance (100) according to any of the preceding claims,
it is characterized in that the preparation method is characterized in that,
the laundry care appliance (100) has a lye container (105) for receiving washing liquor and has a pressure sensor for detecting a pressure exerted by the washing liquor on the lye container (105),
the lye container (105) is fluidically connected to the suction line (111) and
the pump control device (135) is designed to: the rotational speed of the pump motor (131,133) is controlled as a function of the detected pressure in order to prevent air from being sucked in via the associated pressure line (123, 129).
4. Laundry care appliance (100) according to claim 3,
it is characterized in that the preparation method is characterized in that,
the pump control device (135) is designed to: -reducing the rotational speed of the pump motor (131,133) when the detected pressure is below a predetermined pressure threshold.
5. The laundry care appliance (100) according to any of claims 1, 2, 4,
it is characterized in that the preparation method is characterized in that,
the pump control device (135) is designed to: during the activation time period, the first pump motor (131) is activated in order to pump washing liquid out of the first pressure chamber (119) via the first pressure line (123) in the first feed flow (137) and
the pump control device (135) is designed to: during the activation time period, the second pump motor (133) is activated in order to pump washing liquid from the second pressure chamber (125) until a maximum washing liquid level (139) in the second pressure line (129) is reached.
6. The laundry care appliance (100) of claim 5,
it is characterized in that the preparation method is characterized in that,
the first pressure chamber (119) comprises a pump-out pressure chamber,
the first pressure connection (121) comprises a pump-out pressure connection, and
the first pressure line (123) comprises a pump-out line,
wherein the pump control device (135) is designed to: the first pump motor (131) is controlled such that, during the activation time period, washing liquid can be pumped out of the laundry care appliance (100) from the pump-out pressure chamber through the pump-out line in a pump-out delivery flow.
7. The laundry care appliance (100) of any one of claims 1, 2, 4, 6,
it is characterized in that the preparation method is characterized in that,
the pump control device (135) is designed to: in a further activation time period, the second pump motor (133) is activated in order to pump washing liquid out of the second pressure chamber (125) via the second pressure line (129) in the second supply flow (143) and
the pump control device (135) is designed to: in the further activation time interval, the first pump motor (131) is activated in order to pump washing liquid from the first pressure chamber (119) until a maximum washing liquid level (139) in the first pressure line (123) is reached.
8. Laundry care appliance (100) according to claim 7,
it is characterized in that the preparation method is characterized in that,
the second pressure chamber (125) comprises a cyclical pumping pressure chamber,
the second pressure connection (127) comprises a circulation pumping pressure connection, and
said second pressure line (129) comprising a circulation pumping line,
wherein the second pump motor (133) is configured for: during the further activation time period, washing liquid is pumped cyclically from the circulation pumping pressure chamber into the laundry care appliance (100) through the circulation pumping line in a circulation pumping transport flow.
9. Laundry care appliance (100) according to claim 8,
it is characterized in that the preparation method is characterized in that,
the laundry care appliance (100) has a lye container (105),
the suction line (111) and the circulating pumping line are each fluidically connected to the lye container (105), and
wherein the second pump motor (133) is configured for: washing liquid is pumped out of the lye container (105) through the suction line (111) and the pumped washing liquid is re-pumped into the lye container (105) through the circulating pumping line in a circulating pumping transport stream.
10. Laundry care appliance (100) according to any of claims 1, 2, 4, 6, 8, 9,
it is characterized in that the preparation method is characterized in that,
the suction connection (113) has a first connection diameter,
the first pressure connection (121) has a second connection diameter, and
the second pressure connection (127) has a third connection diameter,
wherein the first nozzle diameter is greater than the second nozzle diameter or the third nozzle diameter.
11. Laundry care appliance (100) according to any of claims 1, 2, 4, 6, 8, 9,
it is characterized in that the preparation method is characterized in that,
the suction line (111) has a first line diameter,
the first pressure line (123) has a second line diameter, and
the second pressure line (129) has a third line diameter,
wherein the first conduit diameter is greater than the second conduit diameter or the third conduit diameter.
12. Laundry care appliance (100) according to any of claims 1, 2, 4, 6, 8, 9,
it is characterized in that the preparation method is characterized in that,
the first pump motor (131) and the second pump motor (133) have a first rotating wheel and a second rotating wheel, respectively,
wherein the first pump motor (131) is configured for: driving the first rotating wheel in a rotational direction for pumping washing liquid from the first pressure chamber (119), and
wherein the second pump motor (133) is configured for: driving the second rotating wheel in a rotational direction for pumping washing liquid from the second pressure chamber (125).
13. Laundry care appliance (100) according to any of claims 1, 2, 4, 6, 8, 9,
it is characterized in that the preparation method is characterized in that,
the first pump motor (131) or the second pump motor (133) includes an electric motor.
14. Laundry care appliance (100) according to any of claims 1, 2, 4, 6, 8, 9,
it is characterized in that the preparation method is characterized in that,
the laundry care appliance (100) having a power detection element for detecting an electrical power value of the first pump motor (131) or of the second pump motor (133),
the pump control device (135) is designed to: determining the delivery pressure and/or the delivery flow of the washing liquid in the first pressure line (123) or the second pressure line (129) on the basis of the detected power value, and
the pump control device (135) is designed to: -changing the rotational speed of the first pump motor (131) or of the second pump motor (133) as a function of the determined delivery pressure and/or delivery flow.
15. Laundry care appliance (100) according to claim 13,
it is characterized in that the preparation method is characterized in that,
the first pump motor (131) or the second pump motor (133) comprises a brushless direct current motor in the form of a B L DC motor or a permanently excited brushless synchronous drive.
16. A method (200) for pumping washing liquid in a laundry care appliance (100) comprising a pump (115) for pumping washing liquid,
wherein the pump (115) has:
a suction chamber (117) having a suction connection (113) for fluidically connecting to a suction line (111),
-a first pressure chamber (119) having a first pressure connection (121) for fluid-technical connection to a first pressure line (123), and
a second pressure chamber (125) having a second pressure connection (127) for fluid-technical connection to a second pressure line (129), and
wherein the pump (115) has:
-a first pump motor (131) for pumping washing liquid from the first pressure chamber (119) through the first pressure line (123) in a first delivery flow (137), and
-a second pump motor (133) for pumping washing liquid from the second pressure chamber (125) through the second pressure line (129) in a second delivery flow (143),
the laundry care appliance comprising a pump drive device (135) for controlling the first pump motor (131) and the second pump motor (133),
it is characterized in that the preparation method is characterized in that,
the method (200) comprises:
activating (201) one of the two pump motors (131,133) by means of the pump control device (135) during an activation time period in order to pump washing liquid from the associated pressure chamber (119,125) through the associated pressure line (123,129) with the associated supply flow (137,143), and,
during the activation time interval, the other of the two pump motors (131,133) is activated (203) by the pump control device (135) in order to pump washing liquid from the associated pressure chamber (119,125) through the associated pressure line (123,129) until a maximum washing liquid level (139) in the associated pressure line (123,129) is reached in order to prevent air from being sucked in through the associated pressure line (123,129), and
wherein the pump control device (135) is further configured to: controlling the rotational speed of the first pump motor (131) and the second pump motor (133).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102016201446.3 | 2016-02-01 | ||
| DE102016201446.3A DE102016201446B3 (en) | 2016-02-01 | 2016-02-01 | Laundry care device with a pump control |
| PCT/EP2016/082802 WO2017133825A1 (en) | 2016-02-01 | 2016-12-29 | Laundry treatment appliance comprising a pump drive system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108603323A CN108603323A (en) | 2018-09-28 |
| CN108603323B true CN108603323B (en) | 2020-08-04 |
Family
ID=57749941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680080694.1A Active CN108603323B (en) | 2016-02-01 | 2016-12-29 | Washing article nursing device with pump driving and controlling device |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP3411520B1 (en) |
| CN (1) | CN108603323B (en) |
| DE (1) | DE102016201446B3 (en) |
| PL (1) | PL3411520T3 (en) |
| WO (1) | WO2017133825A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102554903B1 (en) | 2018-04-03 | 2023-07-11 | 엘지전자 주식회사 | Washing Machine |
| DE102019207351A1 (en) * | 2019-05-20 | 2020-11-26 | BSH Hausgeräte GmbH | Laundry care device with one control |
| DE102019209149A1 (en) * | 2019-06-25 | 2020-12-31 | BSH Hausgeräte GmbH | Laundry care device with a pumping device and a method for operating the laundry care device |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3542594A (en) * | 1968-06-19 | 1970-11-24 | Maytag Co | Fluid control system |
| DE3825502A1 (en) * | 1988-07-27 | 1990-02-01 | Licentia Gmbh | Method and device for controlling the lye pumping-off operation in washing machines |
| DE19907074A1 (en) * | 1999-02-19 | 2000-08-24 | Bsh Bosch Siemens Hausgeraete | Water-bearing household appliance, in particular household dishwasher |
| CN1536156A (en) * | 2003-04-11 | 2004-10-13 | 乐金电子(天津)电器有限公司 | Cylinder washing machine |
| JP2008000196A (en) * | 2006-06-20 | 2008-01-10 | Toshiba Corp | Washing machine |
| EP2009165A1 (en) * | 2007-06-28 | 2008-12-31 | Bonferraro S.p.A. | Operating cycle for the drain pump of a household washing appliance |
| EP2138625B1 (en) * | 2008-06-24 | 2010-09-22 | Candy S.p.A. | Apparatus for circulating flows of washing and rinsing liquids in a laundry washing machine |
| DE102009002224B4 (en) * | 2009-04-06 | 2012-09-06 | BSH Bosch und Siemens Hausgeräte GmbH | Water-conducting household appliance, in particular dishwasher |
| US8793828B2 (en) * | 2010-04-13 | 2014-08-05 | Whirlpool Corporation | Laundry treating appliance with automatic pump shutoff |
| BRPI1001488A2 (en) * | 2010-05-26 | 2012-02-28 | Electrolux Do Brasil S.A. | self-cleaning filter improvement for washing machines |
| CN104514113A (en) * | 2013-09-27 | 2015-04-15 | 海尔集团技术研发中心 | Washing machine and clothes washing control method thereof |
-
2016
- 2016-02-01 DE DE102016201446.3A patent/DE102016201446B3/en not_active Expired - Fee Related
- 2016-12-29 PL PL16822696T patent/PL3411520T3/en unknown
- 2016-12-29 CN CN201680080694.1A patent/CN108603323B/en active Active
- 2016-12-29 WO PCT/EP2016/082802 patent/WO2017133825A1/en active Application Filing
- 2016-12-29 EP EP16822696.7A patent/EP3411520B1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP3411520B1 (en) | 2021-03-17 |
| PL3411520T3 (en) | 2021-10-11 |
| DE102016201446B3 (en) | 2017-02-09 |
| EP3411520A1 (en) | 2018-12-12 |
| CN108603323A (en) | 2018-09-28 |
| WO2017133825A1 (en) | 2017-08-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8603261B2 (en) | Dishwashing machine with a pump with a brushless permanent magnet motor | |
| CN108603323B (en) | Washing article nursing device with pump driving and controlling device | |
| US8858719B2 (en) | Method for the operation of a water-conducting household appliance | |
| CN108342877B (en) | Laundry care appliance with control device | |
| US7967573B2 (en) | Method for driving a bidirectional motor to rotate a fluid circulation pump | |
| US9609996B2 (en) | Method for pumping a fluid out of an aquiferous household device | |
| CN110073046B (en) | Laundry care appliance with control device | |
| CN107849776B (en) | Laundry care appliance and laundry care method | |
| CN107849775B (en) | Laundry care appliance and laundry care method | |
| CN109661490B (en) | Laundry care appliance with control device | |
| CN110714309B (en) | Washing machine with hydraulic rotating separator and operation method thereof | |
| US8734136B2 (en) | Water-conducting household appliance, particularly a dishwasher | |
| US8734588B2 (en) | Dishwasher with improved cleaning effect | |
| JP2005000511A (en) | Dishwasher | |
| JP3812010B2 (en) | dishwasher | |
| CN108603324B (en) | Washing article nursing device with lye pump | |
| CN112127120B (en) | Laundry care appliance with pump device and method for operating a laundry care appliance | |
| EP3995618A1 (en) | Washing machine and control method of washing machine | |
| CN108699756B (en) | Laundry care appliance with pump and method | |
| US11466391B2 (en) | Method for controlling washing machine | |
| CN111962257B (en) | Washware care implement with control device | |
| EP3613885A1 (en) | Method of controlling a laundry treating device | |
| JP2001078948A (en) | Dishwasher | |
| JP4444009B2 (en) | dishwasher | |
| JP5601511B2 (en) | Bathing equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |