A dishwasher using an electric pump and the electric pump

Abstract

A dishwasher using an electric pump and the electric pump, the dishwasher comprising: a program controller, which is internally provided with a program for automatically checking the state of electric loads connected to its control end before the loads are driven; an electric pump for circulating or discharging washing water, the motor winding in the electric pump being connected to the power supply end of the electric pump through a controlled electronic switch; the power supply end of the electric pump being connected to a control end of the program controller; characterized in that a resistor of a specified value is arranged in the electric pump and connected to the power supply end of the electric pump. The design makes the power supply end of the electric pump present the resistor of the specified value under normal conditions when the electric pump is automatically checked by the program controller before being driven, so that the electric pump can effectively accept the automatic check. The product description of the electric pump includes the specified value, which is conducive to the standardized management of the production and use quality of the electric pump.

Description

Technical Field

[0001] This utility model relates to a dishwasher using an electric pump and the electric pump, which may be classified as A47L15 / 42 by IPC. Background Technology

[0002] The design of a dishwasher using an electric pump is described in the applicant's Chinese invention patent CN201110159980. This dishwasher incorporates an electric pump for circulating and / or discharging washing water, and an internal program controller to control the pump. The program controller has a program that automatically checks the pump's status before it is driven to ensure proper start-up and operation. A recent problem with existing designs is that, to improve performance, many electric motors driving the pump have been modified to incorporate built-in electronic switches. These switches cause the pump to exhibit infinite impedance during the automatic check by the program controller before being driven, making it difficult to determine its true status.

[0003] For relevant terminology and common knowledge, please refer to the aforementioned patents, as well as the Mechanical Engineering Handbook and Electrical Engineering Handbook published by Machinery Industry Press in 1978-1983 or the 2nd edition in 1997. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a dishwasher using an electric pump and the electric pump, which can overcome the problems described in the background art.

[0005] The technical solution of this utility model to solve the technical problem is a dishwasher using an electric pump, which includes:

[0006] —A programmable controller with a built-in program that automatically checks the status of electrical loads connected to its control terminals before they are driven;

[0007] —An electric pump used to circulate or discharge washing water, wherein the motor windings inside the electric pump are connected to the power supply terminal of the electric pump via a controlled electronic switch;

[0008] —The power supply terminal of the electric pump is connected to a control terminal of the programmable controller;

[0009] The feature is that the electric pump is equipped with a resistor of a specified value, which is connected to the power supply terminal of the electric pump.

[0010] After the power supply terminal of the electric pump is connected to a resistor of a specified value, when the electric pump is automatically checked by the program controller before being driven, the power supply terminal of the electric pump will normally exhibit the resistance of the specified value, so that it can effectively accept the automatic check: if the power supply terminal of the electric pump exhibits the resistance of the specified value in the automatic check, it can at least be determined that the power supply terminal of the electric pump is normally connected to the designated control terminal of the program controller.

[0011] The design further incorporates multiple specified values, each associated with the rated value of an electric pump. This design allows the programmable controller to determine the rated value of the electric pump connected to its control terminal based on the automatically detected specified values, and then retrieves the appropriate control data from memory for that pump to implement the most suitable control for that pump.

[0012] The technical solution of this utility model to solve the technical problem also includes an electric pump applicable to the dishwasher, and the product specification of the electric pump includes the specified values. This design is beneficial to the standardized management of the production and use quality of the electric pump. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the basic mechanical structure of the dishwasher according to an embodiment of the present invention;

[0014] Figure 2 yes Figure 1 AA bottom view;

[0015] Figure 3 This is a schematic block diagram of the dishwasher control circuit according to an embodiment of the present invention;

[0016] Figure 4 yes Figure 3 Schematic diagram of the control circuit of the washing pump; Detailed Implementation

[0017] The dishwasher of this invention is an improvement on the dishwasher described in the specification of the applicant's prior Chinese invention patent CN201110159980.

[0018] The basic structure of the dishwasher in this embodiment of the invention is as follows: Figure 1 and Figure 2 As shown, it inherits from the specification attached to CN201110159980. Figure 1 The basic mechanical structure shown in Figure 12 includes the following structures and / or components:

[0019] 1a. Inlet valve 2. Heater 3a. Water level switch 7. Shut-off valve 8. Washing pump 9. Softener - Resin chamber 10. Salt inlet 11. Washing water outlet 12. Inner tank 13. Condensate elbow 14. Outer casing 15. Filter screen I 16. Stainless steel filter screen 17. Filter screen II 18. Water collection tank 19. Drain pump 20. Softener - Salt chamber

[0020] It also includes a program controller (not shown in the figure above), which controls the washing pump 8 to circulate and spray washing water to the dishes in the inner tank 12 for washing, and controls the drain pump 19 to discharge the water to the outside of the machine at regular intervals.

[0021] A schematic diagram of the dishwasher control circuit according to an embodiment of the present invention is shown in the figure. Figure 3 ,visible:

[0022] —The programmable controller 102 is based on the microcontroller U201. The microcontroller U201 has a built-in program. Its I / O ports are input from sensor signals from selector switch 107, water level switch 3a, and safety switch 101, etc., and output through self-test and drive circuit 16 to control electrical loads such as washing pump 8, heater 2, water inlet valve 1a, and drain pump.

[0023] —After the dishwasher is powered on, the built-in program of the microcontroller U201 immediately drives the self-test and drive circuit 16 to switch to the detection state, measuring the resistance of the electrical loads such as the washing pump 8, heater 2, water inlet valve 1a and drain pump at each output terminal of the self-test and drive circuit 16 of the program controller 102.

[0024] —If the above resistance measurement results meet the requirements, it is determined that the connection and electrical status of these electrical loads to the output terminal of the self-test and drive circuit 16 of the program controller 102 are normal, and they can start and run normally. The built-in program of the microcontroller U201 then drives the self-test and drive circuit 16 to switch to the power supply state: according to the steps set by the built-in program of the microcontroller U201, power is output to the electrical loads such as the water inlet valve 1a, heater 2, washing pump 8 and drain pump in sequence, so that the dishwasher runs continuously according to the steps set by the built-in program of the microcontroller U201.

[0025] like Figure 4 As shown, the washing pump 8 is an electric pump driven by a permanent magnet motor (synchronous motor or DC brushless motor). The voltage at the AC power terminals L and N is supplied to the windings of the motor M by an electronic switch controlled by the microcontroller U202 according to the polarity of the permanent magnet rotor. The electronic switch causes the electric pump to present infinite impedance when it is automatically checked by the program controller 102 before being driven, making it difficult to determine its true state. Therefore, a resistor R1 needs to be connected across the power terminals L and N of the conventionally supplied electric pump. Figure 3 The self-test and drive circuits control the washing pump 8. Figure 4 Specifically, it consists of a switching circuit and a detection circuit. The built-in program of the microcontroller U201 causes the dishwasher to immediately drive the switching circuit to switch the AC power terminals L and N to the detection state after the power is turned on. If the measurement result of the resistance between the AC power terminals L and N by the microcontroller U201 at this time is the specified resistance value of the resistor R1, it is determined that the connection and electrical status of the washing pump to the control terminal of the program controller 102 are normal, and it can start and run normally. The built-in program then drives the switching circuit to switch the AC power terminals L and N to the 220VAC power supply state, so that the dishwasher supplies power to the washing pump 8 according to the set steps of the built-in program of the microcontroller U201, and sprays the washing water circulatedly to the tableware in the inner tank 12 for continuous washing operation.

[0026] In this embodiment, the rated power of the washing pump is 100W, and the resistance value of the resistor R1 connected across its power terminals L and N is 100kΩ. The washing pump also has rated power specifications of 40W, 60W, and 160W, with corresponding resistance values ​​of 40kΩ, 60kΩ, and 160kΩ. To reduce resistor heat generation, this resistance value can be increased tenfold, but the measurement accuracy will be slightly reduced. This resistance value is recorded as a rated parameter of the washing pump in the product datasheet and is used by the programmable controller's built-in program to identify and control the connected washing pump. For example, when the programmable controller 102 automatically detects… Figure 4 When the resistance between the L and N terminals of the AC power supply is 100kΩ, it is determined that the rated power of the connected electric pump is 100W. The control data of the electric pump suitable for this 100W is recalled from the built-in program to implement the most suitable operating time and voltage control for the electric pump.

Claims

1. A dishwasher using an electric pump, the dishwasher comprising: —A programmable controller with a built-in program that automatically checks the status of electrical loads connected to its control terminals before they are driven; —An electric pump used to circulate or discharge washing water, wherein the motor windings inside the electric pump are connected to the power supply terminal of the electric pump via a controlled electronic switch; —The power supply terminal of the electric pump is connected to a control terminal of the programmable controller; Its characteristic is that the electric pump is equipped with a resistor of a specified value, which is connected to the power supply terminal of the electric pump.

2. The dishwasher according to claim 1, characterized in that: The specified values ​​are multiple, each relating to the rated value of an electric pump.

3. An electric pump applied to the dishwasher of claim 1 or claim 2, characterized in that: The product specifications for this electric pump include the specified values.

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