WO2013189145A1

WO2013189145A1 - Pump for adding detergent accurately used in washing machine

Info

Publication number: WO2013189145A1
Application number: PCT/CN2012/084285
Authority: WO
Inventors: 王立东; 班永
Original assignee: 无锡小天鹅股份有限公司
Priority date: 2012-06-18
Filing date: 2012-11-08
Publication date: 2013-12-27
Also published as: CN102704241A

Abstract

A pump for adding a detergent accurately used in a washing machine relates to parts of a washing machine, and comprises: a detergent container (7), an adding piston element, a motor (2), and a counting device. The detergent container (7) is connected to a cavity of the adding piston element. A drive shaft of the motor (2) is connected to the piston of the adding piston part through a crank mechanism, both the crank mechanism and the piston being flexible parts. A counting trigger part of the counting device is in linkage with the flexible parts. Each piston movement in the present invention indicates a fixed and accurate pump fluid amount; therefore, the detergent is added more accurately regardless of detergent types. At the same time, the design of controlling reciprocation movement of the piston and counting the piston movement times through an electromechanical means is simple in structure, reliable in movement, and cost-effective in production.

Description

Instruction manual

Preservative pump for washing machine

Technical field

The present invention relates to a washing machine component, and more particularly to a dispensing pump for precise dispensing of a detergent on an automated washing machine.

Background technique

With the continuous advancement of the home appliance industry, new technologies and new functions are emerging. Many manufacturers add automatic detergent adding function to the automatic washing machine. Generally, a container for storing detergent is installed inside the washing machine. When the washing machine is working, the amount of laundry measured by the function module such as the automatic weighing of the washing machine is A certain amount of detergent is pumped into the washing tub through various adding pumps to realize intelligent addition of the detergent, and the measuring means is to calculate the pumping time.

However, with the increasing number of detergent brands and types, the original intelligent delivery device will present inaccurate delivery problems during use, and sometimes the amount of delivery will not be sufficient, and the laundry effect will not be achieved; sometimes excessive delivery will bring difficulties to rinsing. Not environmentally friendly. The main reason for these problems is that different detergents exhibit different viscosities at different temperatures. The existing automatic dispensing device has poor accuracy in time measurement when adding different viscosity detergents, and the difference in the amount of addition is very high. Big. Even by measuring the ambient temperature and feeding back to the controller for adjustment of the delivery time, it is only possible to achieve the effect of accurately delivering a certain type of detergent, because the viscosity of other properties of the detergent is different at different temperatures. all different. Existing The brand and type of detergents have brought great inconvenience to users' applications, which has affected the popularity of automatic delivery systems.

Summary of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to invent an accurate dispensing pump for automatic dispensing of detergents in automatic washing machines.

In order to achieve the above summary, the technical means adopted by the present invention are:

A detergent delivery precision pump for a washing machine, comprising: a detergent storage container, a delivery piston assembly, a motor and a counting device, wherein the detergent storage container communicates with a cavity of the injection piston assembly, and the drive shaft of the motor passes The crank mechanism connects the piston to which the piston portion is placed, the crank mechanism and the piston are movable members, and the counting triggering member of the counting device has a linkage relationship with the movable member.

The preferred counting device is a micro switch composed of a fixed contact piece and a movable contact piece, and the counting triggering member is a movable contact piece; the two contacts are electrically connected to the main control chip of the washing machine.

Further preferably, the rod of the piston is provided with a protrusion which can be in contact with the movable contact piece, and the extreme position of the contact point of the two can make the fixed contact piece and the movable contact piece contact.

Another solution: The main shaft of the motor is provided with a protrusion that can touch the movable contact piece, and the contact limit position of the protrusion and the movable contact piece can contact the fixed contact piece and the movable contact piece.

The detergent storage container has a liquid inlet port and a liquid outlet port, and the liquid inlet port and the liquid outlet port are provided with a unidirectional pad.

The invention relates to a precise detergent dispensing device for pumping liquid using a piston. The metering according to the number of pumping liquids is significantly improved compared with the prior art time-measuring technical means: since the capacity of the piston cavity is fixed, Each piston action is a fixed and accurate pump The amount of liquid can accurately control the precise delivery of detergent as long as the number of piston movements is controlled, regardless of the type of detergent and environmental factors. At the same time, the design of the reciprocating action of the piston and the counting of the piston action by means of electromechanical means is simple, reliable, and low in manufacturing cost. Therefore, in general, the invention is convenient to manufacture, has good mechanical reliability, and the accuracy of detergent delivery is greatly improved.

DRAWINGS

Figure 1 is an outline view of an embodiment of the present invention;

Figure 2 is an internal structural view of an embodiment of the present invention;

Figure 3 is an exploded view of the components of the embodiment of the present invention.

detailed description

This embodiment is a specific implementation of the structure of the present invention, which adopts a modular and component manufacturing method commonly used in the washing machine industry, and makes each component into an easy-to-install and replace whole. Of course, a more dispersed combination of devices can be employed as long as the connection relationship of the present invention can be satisfied.

1, 2, this embodiment includes a pump casing 1, a motor 2, a crank 3, a connecting rod 4, a slider 5, a micro switch 6, a detergent storage container 7, a unidirectional pad 8, a unidirectional pad bracket 9 , spring 12, piston head 10, piston rod 11.

A crank 3 and a connecting rod 4 are disposed in the pump casing 1, and the cavity of the piston assembly is connected to the pump casing 1 and the detergent storage container, wherein the detergent storage container 7 is provided with a liquid inlet port 7a and an outlet liquid 7b.

2 is an internal structural view of the piston assembly including a piston head 10 disposed in the piston cavity 13 and a piston rod 11 at the rear, the tail of the piston rod 11 being coupled to the connecting rod 4, The connecting rod 4 is connected to the crank 3, and the crank 3 is fixed on the main shaft of the motor 2, so that the rotating of the motor can finally drive the piston head 10 to reciprocate along the piston cavity 13. In practice, the trajectory limitation of the piston rod 11 and the connection details of the crank 3 and the connecting rod 4 (e.g., using a single degree of freedom hinge connection) are easily conceivable by those skilled in the mechanical arts and will not be described.

As shown in FIG. 2 and FIG. 3, a slider 5 is fixed to the tail end of the piston rod 11, and the slider 5 is placed in a slide la in the pump casing 1, and a notch is provided in the slide, the micro switch The movable contact of 6 is located at the notch of the slide la, and the micro switch can be triggered twice by the reciprocating motion of the piston once. The micro switch 6 is electrically connected to the loading controller of the washing machine (may be a separate placing controller, or may be a main controller of the washing machine as a whole, and the present invention refers to a controller that controls the start and stop of the placing action, the above two Both apply), the number of actions of the piston of the main controller through the power-off feedback.

The one-way pad 8 is placed in the liquid outlet 7b of the pump casing 1, the spring 12 is placed outside the rubber column behind the one-way pad 8, and the one-way pad bracket 9 is placed outside the spring 12, and is stuck in the pump casing 1. At the outlet.

The action process of the present invention is as follows:

At the beginning of the delivery, the controller issues a delivery command, controls the rotation of the motor 2, drives the crank 3 to rotate, the crank 3 drives the linkage 4 to move, and the connecting rod 4 drives the piston rod 11 to reciprocally slide inside the piston cavity 13 in the pump casing 1. At the same time, the slider 5 also reciprocates in the slide la of the pump casing 1, and the bump of the slider 5 drives the contacts of the micro switch 6 to perform the power-off operation. When the piston rod 11 drives the piston head 10 to press into the cavity (as shown in the left end of the drawing), the sealed space formed between the liquid outlet 7b and the pump casing 1 forms a negative pressure, and at this time, the pump casing 1 The unidirectional pad 8 at the liquid inlet 7a will compress the spring 12 to press the liquid into the sealed space; When the piston rod 11 drives the piston head 10 to move to the right end (as shown in the figure), the sealed space formed between the liquid outlet 7b and the pump casing 1 will form a positive pressure, and the one-way pad 8 at the liquid outlet will compress the spring. 12, press the liquid out.

The counting device of this embodiment employs a micro switch, which has a simple structure and low cost, and can also use other more complicated counting devices such as infrared counting. At the same time, the structure of the trigger count, the embodiment adopts the slider 5 which operates synchronously with the piston rod, and other trigger structures associated with the rotation of the link 4 or the crank 3 may also be used, such as setting on the running line of the crank. The trigger mechanism of the micro switch, set on the running line of the connecting rod, and the like. These forms all satisfy the relationship between the triggering member and the moving member required by the present invention, and therefore fall within the scope of protection of the present invention.

The invention utilizes the piston to cause the air pressure change inside the washing storage container 7, and combines the one-way pad to make the action of discharging the detergent; through the counting of the micro switch associated with the action of the piston, the combination of the two realizes the precise delivery of the detergent. control. The pump of this structure is not affected by the environment, and is not affected by the characteristics of the detergent such as viscosity, density, etc., and the measurement is accurate and the action is reliable.

Claims

Claim

A detergent delivery precision pump for a washing machine, comprising: a detergent storage container (7), a delivery piston assembly, a motor (2) and a counting device, the detergent storage container having a liquid inlet (7a) And the liquid outlet (7b), the detergent storage container is in communication with the cavity of the piston assembly; the drive shaft of the motor is connected to the piston of the piston portion through the crank mechanism, the crank mechanism and the piston are movable parts, and the counting device triggers the counting Parts are associated with moving parts.

2. The detergent precise dispensing pump for a washing machine according to claim 1, wherein the counting device is a micro switch (6) including a fixed contact piece and a movable contact piece, and the micro switch The controller is electrically connected.

3. The detergent delivery pump for a washing machine according to claim 1, wherein: the injection piston assembly comprises a piston rod (11), and the piston rod is provided with a slider (5) on the slider. A projection is provided to trigger the micro switch (6).

A detergent precise dispensing pump for a washing machine according to claim 1, wherein: the motor (2) has a protruding device connected to the main shaft of the motor (2) for triggering the micro switch.

A detergent delivery pump for a washing machine according to claim 1, wherein: said liquid inlet (7a) and said liquid outlet (7b) are provided with a unidirectional pad (8).