Automatic liquid feeding device with electric push rod

Abstract

An automatic liquid feeding device with an electric push rod comprises a liquid storage tank mounted on a door plate of a dish-washing machine, a liquid feeding box mounted below the liquid storage tank, an automatic liquid feeding module mounted between the liquid storage tank and the liquid feeding box, the automatic liquid feeding module comprises a valve body, a push rod seat mounted at the rear end of the valve body, and a push rod on the push rod seat extends into the valve body. A plurality of liquid outlet grooves are formed in the peripheral wall of the front end of the push rod, and slope steps are arranged at the rear ends of the liquid outlet grooves; a piston capable of moving back and forth is sleeved at the front end of the push rod, the piston moves backwards and is attached to the slope step, the front cavity and the rear cavity of the valve body are isolated, and after the piston moves forwards and leaves the slope step, the front cavity and the rear cavity of the valve body are communicated through a liquid outlet groove. When the push rod moves backwards, cleaning liquid in the rear cavity flows into the front cavity; when the push rod moves forwards, the cleaning liquid in the front cavity is discharged through the liquid outlet one-way valve, the cleaning liquid in the liquid storage tank enters the rear cavity of the valve body through the liquid inlet one-way valve, and the dish washing machine has the advantages of being simple in structure and accurate in liquid outlet and is suitable for various dish washing machines.

Description

Technical Field

[0001] The utility model relates to an accessory for a dishwasher, in particular to a mechanism for automatically adding cleaning liquid to the dishwasher. Background Art

[0002] A dishwasher is a very practical cleaning tool, effectively removing dirt and bacteria from the dishwasher, ensuring the hygiene and cleanliness of dishes. Currently, most dishwashers on the market require manual addition of detergent. Each time you wash dishes, you must first pour the dishwasher detergent into the detergent compartment inside the dishwasher. The amount of dishwasher detergent to be used is determined by the product's instructions, and you need to carefully read the instructions and use the appropriate amount of detergent as required, making this operation very cumbersome.

[0003] The Patent Office disclosed on November 25, 2022, a quantitative detergent dispenser with patent number 202210965199.6, including a detergent delivery box, a detergent storage chamber and a transmission mechanism adapted to be installed with the detergent delivery box; the transmission mechanism and the detergent storage chamber are both provided with a one-way circulation valve; the detergent delivery box is provided with an injection port and a liquid outlet, the injection port is in one-way communication with the detergent storage chamber; the detergent storage chamber, the transmission mechanism and the liquid outlet are in one-way communication with each other through the one-way circulation valve, and the transmission mechanism and the one-way circulation valve cooperate with each other to make the detergent quantitatively output from the liquid outlet, and through the cooperation of the one-way circulation valve, the transmission mechanism, the detergent storage chamber and the detergent delivery box, the detergent circulates in the set direction and is quantitatively delivered. The injection port and the liquid outlet of this structure can only be installed together, otherwise it is easy to cause problems of poor injection or discharge. Summary of the Invention

[0004] The purpose of the utility model is to address the defects and shortcomings of the above-mentioned prior art and to provide people with an electric push rod automatic liquid dosing device that can automatically dosing and accurately use liquid, which is used for dosing liquid in dishwashers.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: the electric push rod automatic liquid dosing device includes a liquid storage tank installed on the door panel of the dishwasher, a liquid dosing box is installed below the liquid storage tank, an automatic liquid dosing module is installed between the liquid storage tank and the liquid dosing box, and the automatic liquid dosing module includes a valve body, a push rod seat is installed at the rear end of the valve body, a liquid inlet connected to the upper liquid storage tank is provided on the side of the valve body, a liquid inlet check valve is installed at the liquid inlet, a liquid outlet connected to the liquid dosing box is provided at the front end of the valve body, and a liquid outlet check valve is installed at the liquid outlet;

[0006] The push rod of the push rod seat extends into the valve body, a plurality of liquid outlet grooves are formed in the peripheral wall of the front end of the push rod, and a beveled step is arranged at the rear end of the liquid outlet grooves; a piston capable of moving forward and backward is sleeved on the front end of the push rod, the piston moves backward and is in close contact with the beveled step, the front cavity of the valve body is isolated from the rear cavity, and after the piston moves forward and is separated from the beveled step, the front cavity of the valve body is communicated with the rear cavity through the liquid outlet grooves.

[0007] The front end of the push rod is provided with a limiting sleeve for limiting the front side of the piston.

[0008] When the push rod extends forward, the piston is in close contact with the beveled step under the resistance of the cleaning liquid, the front cavity of the valve body is communicated with the rear cavity through the liquid outlet grooves; when the push rod retracts backward, the piston is in close contact with the beveled step under the resistance of the cleaning liquid, and the front cavity of the valve body is isolated from the rear cavity.

[0009] The rear end of the piston is provided with a horn capable of being in close contact with the beveled step.

[0010] The rear side of the push rod seat is provided with a motor and a gear box, a screw rod is arranged in the push rod seat, the screw rod is connected with the output end of the gear box, a threaded hole connected with the screw rod is formed in the rear end of the push rod, and the screw rod can drive the push rod to extend and retract forward and backward when the screw rod rotates.

[0011] A plurality of guide grooves are arranged in the push rod seat, and a guide strip is arranged on the outer wall of the rear end of the push rod in the radial direction, the guide strip and the guide grooves limit the rotation of the push rod.

[0012] The rear side of the push rod seat is provided with a motor and a gear box, a rotating sleeve is arranged in the push rod seat, the rotating sleeve is connected with the output end of the gear box, a convex rib is arranged on the inner wall of the rotating sleeve, a wave-shaped step is arranged on the rear end of the push rod, the convex rib on the rotating sleeve is in close contact with the wave-shaped step, a compression spring is further arranged between the push rod and the rotating sleeve, and the motor drives the rotating sleeve to rotate, drives the convex rib to move in close contact with the wave-shaped step, and drives the push rod to extend and retract forward and backward.

[0013] The rear side of the push rod seat is provided with a motor and a gear box, a rotating sleeve is arranged in the push rod seat, the rotating sleeve is connected with the output end of the gear box, a wave-shaped groove is arranged on the outer wall of the rotating sleeve, a convex block capable of being embedded in the wave-shaped groove is arranged on the rear end of the push rod, the motor drives the rotating sleeve to rotate, so that the convex block moves in the wave-shaped groove, and the push rod extends and retracts forward and backward.

[0014] A liquid level sensor is arranged on the bottom side of the liquid storage tank, the liquid level sensor adopts a multi-pole capacitive sensing, a plurality of poles are arranged at different positions in the liquid storage tank, and data acquisition is performed through the output signal of the poles.

[0015] When the push rod moves backward, the front and rear chambers of the valve body are connected through the liquid outlet groove. As the push rod continues to move backward, the cleaning liquid in the rear chamber flows into the front chamber. When the push rod moves forward, the front and rear chambers of the valve body are isolated. As the push rod continues to move forward, the cleaning liquid in the front chamber is discharged through the liquid outlet check valve, generating negative pressure in the rear chamber. The cleaning liquid in the liquid storage tank enters the rear chamber of the valve body through the liquid inlet check valve. With the front and rear chambers isolated, the inflow and outflow of liquids do not interfere with each other, eliminating the problem of unsmooth inflow or outflow. This device has the advantages of simple structure and precise liquid discharge, and is suitable for various dishwashers. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the present utility model.

[0017] Figure 2 This is a structural diagram of the automatic liquid dosing module of the utility model.

[0018] Figure 3 This is a structural sectional view of the automatic liquid dosing module of the utility model.

[0019] Figure 4 This is a structural exploded view of the push rod and piston of the utility model.

[0020] Figure 5 This is a structural sectional view of the push rod and piston of the utility model.

[0021] Figure 6 This is a sectional view of the structure of the push rod extending forward in the utility model.

[0022] Figure 7 This is a cross-sectional view of the structure of the push rod retracted in the utility model.

[0023] Figure 8 This is a cross-sectional view of another embodiment of the push rod seat of the present invention.

[0024] Figure 9 for Figure 8 Exploded view of the push rod and swivel sleeve. DETAILED DESCRIPTION

[0025] like Figure 1As shown, the present invention is an electric push rod automatic liquid dispensing device. It includes a liquid storage tank 10 mounted on the door panel of a dishwasher. When the door panel is closed, the liquid storage tank 10 is in an upright position, and cleaning liquid accumulates at the bottom of the liquid storage tank 10. A liquid level sensor 11 is installed on the side of the bottom of the liquid storage tank 10 to detect and measure the cleaning liquid capacity of the liquid storage tank 10. Due to the high viscosity and poor fluidity of the cleaning liquid, detection requires a long waiting time and may also cause abnormal detection results due to its viscosity. Therefore, the liquid level sensor 11 adopts a multi-electrode capacitive sensing method. Multiple electrodes are placed at different positions within the liquid storage tank 10. The output signals of the electrodes are collected, filtered, and calibrated to obtain initial valid data. This valid data is then analyzed and feature values ​​such as amplitude and frequency are extracted for comprehensive judgment. In addition, the liquid level sensor 11 can also use ultrasonic compensation units, optical sensing distance compensation units, mass compensation units for gain compensation, temperature compensation units for gain compensation, and other methods to achieve liquid level measurement for high-viscosity cleaning liquids.

[0026] A liquid dosing box 20 is installed below the liquid storage tank 10, and an automatic liquid dosing module is installed between the liquid storage tank 10 and the liquid dosing box 20. The automatic liquid dosing module can automatically dosing the cleaning liquid in the liquid storage tank 10 into the liquid dosing box 20, and then it is used after being rinsed with water.

[0027] like Figure 2 、 Figure 3 As shown, the automatic liquid dosing module includes a valve body 30. A liquid inlet 31 is provided on the side of the valve body 30, connected to the liquid storage tank 10 above. A liquid inlet check valve is installed in the liquid inlet 31. A liquid outlet 32 ​​is provided at the front end of the valve body 30, connected to the liquid dosing box 20. A liquid outlet check valve is installed in the liquid outlet 32. Therefore, cleaning liquid in the liquid storage tank 10 can only enter the valve body 30 from the liquid inlet 31 through the liquid inlet check valve and then be discharged from the liquid outlet 32 ​​into the liquid dosing box 20 through the liquid outlet check valve. A push rod seat 50 is installed at the rear end of the valve body 30. Push rods 70 are provided at the front and rear of the push rod seat 50, and the push rods 70 extend into the valve body 30. A motor 40 and a gearbox 60 are provided at the rear of the push rod seat 50. A screw 52 is provided within the push rod seat 50, and is connected to the output end of the gearbox 60. Therefore, when the motor 40 is operating, the gearbox 60 drives the screw 52 to rotate. A threaded hole 72 is provided at the rear end of the push rod 70, connected to the screw 52. Rotation of the screw 52 drives the push rod 70 forward and backward. The push rod seat 50 is provided with a plurality of guide grooves 51. A guide bar 71 is radially disposed on the outer wall of the rear end of the push rod 70. The guide bar 71 and the guide groove 51 limit the rotation of the push rod 70, preventing it from rotating.

[0028] like Figure 4 、 Figure 5As shown, the front end wall of the push rod 70 is provided with multiple liquid outlet grooves 74. The liquid outlet grooves 74 extend axially forward to the end of the front end of the push rod 70. A sloped step 73 is provided at the rear end of the liquid outlet grooves 74. A piston 80 is mounted on the front end of the push rod 70, which can move back and forth. The piston 80 is made of PP soft plastic and requires a certain hardness. A limit sleeve 90 is provided at the front end of the push rod 70. The limit sleeve 90 limits the front side of the piston 80. The distance between the limit sleeve 90 and the sloped step 73 is the distance that the piston 80 moves on the push rod 70. When the piston 80 moves backward and contacts the sloped step 73, the front chamber 33 of the valve body 30 is isolated from the rear chamber 34. After the piston 80 moves forward and leaves the sloped step 73, the front chamber 33 and the rear chamber 34 of the valve body 30 are connected through the liquid outlet grooves 74. A bell mouth 81 is provided on the inner side of the rear end of the piston 80 , which can fit with the inclined step 73 , ensuring a tight fit and completely isolating the front cavity 33 and the rear cavity 34 of the valve body 30 .

[0029] like Figure 6 As shown, when in use, the motor 40 operates to extend the push rod 70, and the piston 80 is moved backward relative to the push rod 70 by the resistance of the cleaning fluid until the bell mouth 81 at the rear end is in contact with the inclined step 73 of the push rod 70, completely isolating the front chamber 33 of the valve body 30 from the rear chamber 34. The push rod 70 continues to extend forward, and the cleaning fluid in the front chamber 33 of the valve body 30 is discharged to the liquid injection box 20 through the liquid outlet one-way valve, and is used after being flushed with water. The rear chamber 34 of the valve body 30 is isolated from the front chamber 33, so negative pressure is generated, and the cleaning fluid in the liquid storage tank 10 enters the rear chamber 34 of the valve body 30 through the liquid inlet one-way valve. After the front chamber 33 and the rear chamber 34 are isolated, the liquid inlet and outlet do not interfere with each other, and there will be no problem of liquid inlet or outlet being not smooth.

[0030] like Figure 7 As shown, when the motor 40 operates to retract the push rod 70, the piston 80, resisted by the cleaning fluid, moves forward relative to the push rod 70 until it contacts the stop sleeve 90 at the front end. After the bell mouth 81 of the piston 80 clears the inclined step 73, the front chamber 33 and the rear chamber 34 of the valve body 30 are connected through the liquid outlet groove 74. As the push rod 70 continues to retract, the cleaning fluid in the rear chamber 34 of the valve body 30 flows into the front chamber 33 through the liquid outlet groove 74. The rearward movement of the push rod 70 precisely controls the amount of cleaning fluid entering the front chamber 33, allowing for precise use of the cleaning fluid during the next application and avoiding waste.

[0031] like Figure 8 、 Figure 9As shown, in another embodiment of the push rod base 50, a motor and a gearbox are installed at the rear of the push rod base 50. The motor 40 and gearbox 60 are also installed at the rear of the push rod base 50. A rotating sleeve 53 is installed within the push rod base 50 and is connected to the output terminal of the gearbox 60. Therefore, when the motor 40 is in operation, the gearbox 60 drives the rotating sleeve 53 to rotate. Ribs 54 are provided on the inner wall of the rotating sleeve 53. A wave-shaped step 75 is provided at the rear end of the push rod 70. The ribs 54 on the rotating sleeve 53 mate with the wave-shaped step 75. A compression spring 55 is also installed between the push rod 70 and the rotating sleeve 53 to ensure that the ribs 54 mate with the wave-shaped step 75. The motor 40 drives the rotating sleeve 53 to rotate, which in turn drives the ribs 54 to move in alignment with the wave-shaped step 75, thereby moving the push rod 70 back and forth. The greatest advantage of this structure is that the motor can drive the push rod 70 to reciprocate as long as it rotates in one direction.

[0032] The rotating sleeve 53 can also be replaced with a rotating rod, onto which the rear end of the push rod 70 is mounted. This rod is connected to the output end of the gearbox 60. The wave-shaped step 75 can be replaced with a wave-shaped groove, with a protrusion embedded in the groove at the rear end of the push rod. The motor drives the rotating rod to rotate, causing the protrusion to move within the groove, driving the push rod to extend and retract. The wave-shaped groove eliminates the need for compression spring 55, ensuring that the protrusion fits the groove. This structure also allows the motor to rotate in one direction, driving the push rod 70 to reciprocate.

[0033] When the push rod 70 moves backward, the front chamber 33 and rear chamber 34 of the valve body 30 are connected through the liquid outlet groove 74. As the push rod 70 continues to move backward, the cleaning liquid in the rear chamber 34 flows into the front chamber 33. When the push rod 70 moves forward, the front chamber 33 and rear chamber 34 of the valve body 30 are isolated. As the push rod 70 continues to move forward, the cleaning liquid in the front chamber 33 is discharged through the liquid outlet check valve, generating negative pressure in the rear chamber 34, and the cleaning liquid in the liquid storage tank 10 enters the rear chamber 34 of the valve body 30 through the liquid inlet check valve. This device has the advantages of simple structure and precise liquid discharge, and is suitable for various dishwashers.

Claims

1. An electric push rod automatic liquid feeding device, which includes a liquid storage tank installed on the door panel of a dishwasher, a liquid feeding box installed below the liquid storage tank, and an automatic liquid feeding module installed between the liquid storage tank and the liquid feeding box, characterized in that The automatic liquid dosing module includes a valve body, a push rod seat is installed at the rear end of the valve body, a liquid inlet connected to the liquid storage tank above is provided on the side of the valve body, a liquid inlet check valve is installed at the liquid inlet, and a liquid outlet connected to the liquid dosing box is provided at the front end of the valve body, and a liquid outlet check valve is installed at the liquid outlet; The push rod on the push rod seat extends into the valve body, and a plurality of liquid outlet grooves are provided on the peripheral wall of the front end of the push rod, and an inclined step is provided at the rear end of the liquid outlet groove; a piston that can move back and forth is set at the front end of the push rod, and the piston moves backward and fits with the inclined step, and the front cavity and the rear cavity of the valve body are isolated. After the piston moves forward and leaves the inclined step, the front cavity and the rear cavity of the valve body are connected through the liquid outlet groove.

2. The electric push rod automatic liquid dosing device according to claim 1, characterized in that A limiting sleeve is provided at the front end of the push rod, and the limiting sleeve limits the front side of the piston.

3. The electric push rod automatic liquid feeding device according to claim 2, characterized in that When the push rod is extended, the piston is subjected to the resistance of the cleaning fluid and moves relative to the push rod, and is in contact with the limit sleeve at the front end, and the front cavity and the rear cavity of the valve body are connected through the liquid outlet groove; when the push rod is retracted, the piston is subjected to the resistance of the cleaning fluid and moves relative to the push rod, and is fitted with the inclined step, and the front cavity and the rear cavity of the valve body are isolated.

4. The electric push rod automatic liquid dosing device according to claim 3, characterized in that The inner side of the rear end of the piston is provided with a bell mouth which can fit with the inclined surface step.

5. An electric push rod automatic liquid dosing device according to any one of claims 1 to 4, characterized in that A motor and a gear box are provided at the rear side of the push rod seat, a screw is provided inside the push rod seat, the screw is connected to the output end of the gear box, a threaded hole connected to the screw is provided at the rear end of the push rod, and when the screw rotates, it can drive the push rod to extend and retract.

6. The electric push rod automatic liquid dosing device according to claim 5, characterized in that A plurality of guide grooves are arranged in the push rod seat, and a guide strip is radially arranged on the outer wall of the rear end of the push rod. The guide strip and the guide groove limit the rotation of the push rod.

7. An electric push rod automatic liquid dosing device according to any one of claims 1 to 4, characterized in that A motor and a gear box are provided on the rear side of the push rod seat, and a rotating sleeve is provided inside the push rod seat. The rotating sleeve is connected to the output end of the gear box, and ribs are provided on the inner wall of the rotating sleeve. A wave step is provided at the rear end of the push rod, and the ribs on the rotating sleeve fit into the wave step. A compression spring is also provided between the push rod and the rotating sleeve. The motor drives the rotating sleeve to rotate, drives the ribs to fit into the wave step and move, and drives the push rod to extend and retract.

8. An electric push rod automatic liquid dosing device according to any one of claims 1 to 4, characterized in that A motor and a gear box are provided on the rear side of the push rod seat, and a rotating rod is provided inside the push rod seat. The rotating rod is connected to the output end of the gear box, and a wave groove is provided on the outer wall of the rotating rod. A protrusion that can be embedded in the wave groove is provided at the rear end of the push rod. The motor drives the rotating rod to rotate, so that the protrusion moves in the wave groove, driving the push rod to extend and retract forward and backward.

9. An electric push rod automatic liquid dosing device according to any one of claims 1 to 4, characterized in that A liquid level sensor is provided on the bottom side of the liquid storage tank. The liquid level sensor adopts multi-electrode capacitive sensing. Multiple electrodes are placed at different positions in the liquid storage tank, and data is collected through the output signals of the electrodes.

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