Automatic pressing type precise liquid feeding mechanism

Abstract

An automatic pressing type precise liquid feeding mechanism comprises a liquid storage box installed on a door plate of a dish washing machine, a liquid feeding box installed below the liquid storage box, a valve body installed between the liquid storage box and the liquid feeding box, a piston valve assembly installed in the valve body, and a liquid feeding device installed in the piston valve assembly. A reciprocating driving mechanism capable of driving the piston valve assembly to move front and back is installed at the rear end of the valve body, the front end of a driving rod of the reciprocating driving mechanism is connected with the piston valve assembly, and a transverse long groove is formed in the rear end of the driving rod. Through the cooperation of the eccentric shaft and the transverse long groove, the rotary motion of the driven gear can be converted into the front-back reciprocating motion of the driving rod. When the piston valve assembly moves forwards, cleaning fluid in the front cavity of the valve body flows into the rear cavity; when the piston valve assembly moves backwards, the front cavity of the valve body generates negative pressure, the cleaning liquid in the liquid storage box enters the front cavity of the valve body through the liquid inlet, the pressure of the rear cavity of the valve body is increased, and the cleaning liquid in the rear cavity is discharged into the liquid feeding box through the liquid outlet. The liquid outlet device has the advantages of simple structure and accurate liquid outlet, and is suitable for various dishwashers.

Description

Technical Field

[0001] This utility model relates to a dishwasher accessory, specifically an automatic press-type precision liquid dispensing mechanism for a dishwasher. Background Technology

[0002] Dishwashers are very practical cleaning tools that effectively remove dirt and bacteria from their interiors, ensuring the hygiene and cleanliness of your dishes. Currently, most dishwashers on the market require manual addition of detergent. Each time you wash dishes, you need to pour dishwasher detergent into the detergent dispenser inside the dishwasher. The amount of detergent used is determined according to the product manual, which requires careful reading to use the appropriate amount, making the process quite cumbersome.

[0003] The State Intellectual Property Office published a patent on November 25, 2022, patent number 202210965199.6, which describes a quantitative detergent dispenser. The dispenser includes a detergent dispensing box, a detergent storage chamber adapted to the dispensing box, and a transmission mechanism. Both the transmission mechanism and the detergent storage chamber are equipped with one-way valves. The dispensing box has an inlet and an outlet, with the inlet connected unidirectionally to the detergent storage chamber. The detergent storage chamber, transmission mechanism, and outlet are sequentially connected unidirectionally via the one-way valves. The transmission mechanism and the one-way valves work together to quantitatively dispense detergent from the outlet. Through the cooperation of the one-way valves, transmission mechanism, detergent storage chamber, and dispensing box, the detergent flows in a predetermined direction and is quantitatively dispensed. This structure cannot precisely control the amount of detergent dispensed each time, easily leading to insufficient or excessive detergent. Summary of the Invention

[0004] The purpose of this invention is to address the deficiencies and shortcomings of the existing technology by providing an automatic press-type precision liquid dispensing mechanism for use in dishwashers.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: The automatic press-type precision liquid dispensing mechanism includes a liquid storage tank installed on the door panel of a dishwasher, a liquid dispensing box installed below the liquid storage tank, and an automatic liquid dispensing module installed between the liquid storage tank and the liquid dispensing box. The automatic liquid dispensing module includes a valve body, with an inlet at the front end of the valve body communicating with the upper liquid storage tank, and an outlet at the rear end of the valve body communicating with the liquid dispensing box. A piston valve assembly is installed inside the valve body, and a reciprocating drive mechanism capable of driving the piston valve assembly to move back and forth is installed at the rear end of the valve body.

[0006] The reciprocating drive mechanism includes a motor and a drive rod. The front end of the drive rod is connected to a piston valve assembly, and a transverse long slot is provided at the rear end of the drive rod. The output end of the motor is provided with a drive gear and a driven gear. An eccentric shaft is provided on the driven gear. The eccentric shaft is movably inserted into the transverse long slot. Through the cooperation of the eccentric shaft and the transverse long slot, the rotational motion of the driven gear can be converted into the reciprocating motion of the drive rod.

[0007] The reciprocating drive mechanism is also equipped with a limit switch, which can press against the contacts of the limit switch when the drive rod retracts.

[0008] The piston valve assembly includes a liquid outlet connector connected to a drive rod, a valve core is provided at the front end of the liquid outlet connector, a liquid outlet groove is provided on the valve core, and a piston is fitted on the outside of the valve core. When the piston moves forward to abut against the inclined step of the valve core, the piston valve assembly isolates the front and rear chambers of the valve body. When the piston moves backward to leave the inclined step of the valve core, the front and rear chambers of the valve body are connected through the liquid outlet groove on the valve core.

[0009] When the piston valve assembly moves forward, the piston moves backward due to friction with the inner wall of the valve core, leaving the inclined step of the valve core, and the front and rear chambers of the valve body are connected through the liquid outlet groove on the valve core; when the piston valve assembly moves backward, the piston moves forward due to friction with the inner wall of the valve core, and when it abuts against the inclined step of the valve core, the piston valve assembly isolates the front and rear chambers of the valve body.

[0010] The valve core has a beveled O-ring on its inclined step.

[0011] The valve core is engaged with the front end of the liquid outlet connector, and the drive rod is engaged with the rear end of the liquid outlet connector. A side hole communicating with the liquid outlet groove on the valve core is opened on the side wall of the liquid outlet connector.

[0012] The valve body has a negative pressure chamber plug at the front end and a waterproof plug at the rear end. Both the negative pressure chamber plug and the waterproof plug are equipped with waterproof sealing rings.

[0013] The negative pressure chamber plug is equipped with a locking shaft, and an L-shaped groove is provided at the front end of the valve body. After the locking shaft on the negative pressure chamber plug is inserted through the L-shaped groove, it rotates to fix the negative pressure chamber plug at the front end of the valve body.

[0014] The liquid outlet is equipped with a liquid outlet check valve, and the liquid inlet is equipped with a liquid inlet check valve.

[0015] The liquid dispensing box is equipped with a water guide channel extending towards the liquid outlet.

[0016] In this invention, when the piston valve assembly moves forward, the cleaning fluid in the front chamber of the valve body flows into the rear chamber; when the piston valve assembly moves backward, a negative pressure is generated in the front chamber of the valve body, and the cleaning fluid in the storage tank enters the front chamber of the valve body through the inlet. The pressure in the rear chamber of the valve body increases, and the cleaning fluid in the rear chamber is discharged into the liquid collection box through the outlet. It has the advantages of simple structure and precise liquid dispensing, and is suitable for various dishwashers. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the liquid dispensing box cover of this utility model after it is opened.

[0019] Figure 3 This is a structural diagram of the automatic liquid dispensing module of this utility model.

[0020] Figure 4 This is an exploded view of the automatic liquid dispensing module of this utility model.

[0021] Figure 5 This is a cross-sectional view of the piston valve assembly of this utility model located at the front end of the valve body.

[0022] Figure 6 This is a cross-sectional view of the piston valve assembly of this utility model located at the rear end of the valve body. Detailed Implementation

[0023] like Figure 1 , Figure 2 As shown, this utility model is an automatic press-type precision liquid dispensing mechanism, which includes a liquid storage tank 200 installed on the door panel of a dishwasher, and a dispensing box 300 installed below the liquid storage tank 200. An automatic liquid dispensing module 100 is installed between the liquid storage tank 200 and the dispensing box 300. The automatic liquid dispensing module 100 includes a valve body 110, with an inlet 111 at the front end of the valve body 110 communicating with the liquid storage tank 200 above, and an outlet 113 at the rear end of the valve body 110 communicating with the dispensing box 300. A one-way valve 115 is installed at the outlet 113, and a one-way valve 114 is installed at the inlet 111 to prevent backflow of the cleaning liquid. The liquid storage tank 200 stores cleaning liquid, and the automatic liquid dispensing module 100 automatically dispenses a measured amount of cleaning liquid into the dispensing box 300. A cover plate 310 is provided on the liquid dispensing box 300, and a grid hole 311 is opened on the cover plate 310. Water from the dishwasher enters the liquid dispensing box 300 through the grid hole 311, comes into contact with the cleaning solution, and then flows back into the dishwasher, thus utilizing the cleaning solution. The liquid dispensing box 300 is provided with a water guide channel 320 extending towards the liquid outlet 113, so that the water flow can be quickly guided to the liquid outlet 113, preventing the cleaning solution from solidifying at the liquid outlet 113.

[0024] likeFigure 3 , Figure 4 As shown, a piston valve assembly 130 is installed inside the valve body 110. A reciprocating drive mechanism capable of driving the piston valve assembly 130 to move back and forth is installed at the rear end of the valve body 110. The reciprocating drive mechanism includes a mechanism housing 120 and a mechanism cover 121. A motor 122 and a drive rod 140 are installed inside the mechanism housing 120. The front end of the drive rod 140 is connected to the piston valve assembly 130, and a transverse long slot 141 is provided at the rear end of the drive rod 140. A drive gear 123 and a driven gear 124 are provided at the output end of the motor 122. An eccentric shaft 125 is provided on the driven gear 124. The eccentric shaft 125 is movably inserted into the transverse long slot 141. Through the cooperation of the eccentric shaft 125 and the transverse long slot 141, the rotational motion of the driven gear 124 can be converted into the reciprocating motion of the drive rod 140.

[0025] A limit switch 150 is also provided inside the housing 120. When the drive rod 140 retracts, it can press against the contact 151 of the limit switch 150. After one liquid injection is completed, the drive rod 140 stops at a fixed position after touching the contact 151 of the limit switch 150, and the liquid outlet 113 is sealed to prevent the cleaning liquid from leaking out.

[0026] The valve body 110 has a negative pressure chamber plug 112 at its front end and a waterproof plug 119 at its rear end. Both the negative pressure chamber plug 112 and the waterproof plug 119 are fitted with waterproof sealing rings 116. The negative pressure chamber plug 112 has a locking shaft 117, and an L-shaped groove 118 is formed at the front end of the valve body 110. The locking shaft 117 is inserted into the L-shaped groove 118 and rotated to fix the negative pressure chamber plug 112 to the front end of the valve body 110. The negative pressure chamber plug 112 and the waterproof plug 119 seal both ends of the valve body 110, forming a sealed inner cavity.

[0027] The piston valve assembly 130 is installed in the inner cavity of the valve body 110. The piston valve assembly 130 includes a liquid outlet connector 136 connected to the drive rod 140. A valve core 131 is located at the front end of the liquid outlet connector 136, and a liquid outlet groove 133 is formed on the valve core 131. A piston 135 is fitted onto the outside of the valve core 131. When the piston 135 moves forward and abuts against the inclined step 132 of the valve core 131, the piston valve assembly 130 isolates the front and rear cavities of the valve body 110. An inclined O-ring 134 is provided on the inclined step 132 of the valve core 131 to ensure a tight seal when the piston 135 moves forward and abuts against the inclined step 132 of the valve core 131. The valve core 131 engages with the front end of the liquid outlet connector 136, and the drive rod 140 engages with the rear end of the liquid outlet connector 136. A side hole 137 communicating with the liquid outlet groove 133 on the valve core 131 is formed on the side wall of the liquid outlet connector 136. The piston 135 moves backward to leave the inclined step 132 of the valve core 131, and the front and rear chambers of the valve body 110 are connected through the liquid outlet groove 133 and the side hole 137 on the valve core 131.

[0028] like Figure 5 , Figure 6 As shown, when the piston valve assembly 130 moves towards the front end of the inner cavity of the valve body 110 under the action of the motor 122 and the drive rod 140, the piston 135 moves backward due to the frictional force with the inner wall of the valve core 131, leaving the inclined step 132 of the valve core 131. The front and rear cavities of the valve body 110 are connected through the liquid outlet groove 133 on the valve core 131 and the side hole 137 of the liquid outlet connector 136, and the cleaning fluid in the front cavity of the valve body 110 flows into the rear cavity. After the motor 122 rotates half a turn, it drives the drive rod 140 to move forward, and the piston valve assembly 130 also moves towards the rear end of the inner cavity of the valve body 110. The piston 135 moves forward due to the frictional force with the inner wall of the valve core 131 and abuts against the inclined step 132 of the valve core 131, thus isolating the front and rear cavities of the valve body 110 by the piston valve assembly 130. As the piston valve assembly 130 continues to move backward, a negative pressure is generated in the front chamber of the valve body 110. The cleaning fluid in the reservoir 200 enters the front chamber of the valve body 110 through the inlet 111, increasing the pressure in the rear chamber of the valve body 110. The cleaning fluid in the rear chamber is then discharged into the dispensing box 300 through the outlet 113. Therefore, each reciprocating motion of the piston valve assembly 130 dispenses a fixed amount of cleaning fluid to the dishwasher. By controlling the number of dispensing cycles, the amount of cleaning fluid dispensed can be controlled. This design features a simple structure and precise dispensing, making it suitable for various dishwashers.

Claims

1. An automatic pressing precise liquid injection mechanism, comprising a liquid storage tank installed on a door panel of a dishwasher, a liquid injection box installed below the liquid storage tank, an automatic liquid injection module installed between the liquid storage tank and the liquid injection box, the automatic liquid injection module comprising a valve body, a liquid inlet opening of the valve body being connected with the liquid storage tank, a liquid outlet opening of the valve body being connected with the liquid injection box, a piston valve assembly being installed in the valve body, a reciprocating driving mechanism being installed at a rear end of the valve body and capable of driving the piston valve assembly to move forward and backward. characterized in that The reciprocating driving mechanism comprises a motor and a driving rod, a front end of the driving rod being connected with the piston valve assembly, a transverse long slot being provided at a rear end of the driving rod, a driving gear and a driven gear being provided at an output end of the motor, an eccentric shaft being provided on the driven gear and being movably inserted into the transverse long slot, the rotation of the driven gear being converted into the forward and backward reciprocating movement of the driving rod through the cooperation of the eccentric shaft and the transverse long slot.

2. The automatic press-type precise liquid injection mechanism according to claim 1, characterized in that A travel switch is further provided in the reciprocating driving mechanism, the driving rod being capable of pressing the contact of the travel switch when being retracted.

3. The automatic pressing type precise liquid injection mechanism according to claim 1 or 2, characterized in that The piston valve assembly comprises a liquid outlet connector connected with the driving rod, a valve core being provided at a front end of the liquid outlet connector, a liquid outlet groove being provided on the valve core, a piston being sleeved on an outer side of the valve core, the piston valve assembly isolating the front and rear cavities of the valve body when the piston moves forward to abut against a beveled step of the valve core, the front and rear cavities of the valve body being communicated through the liquid outlet groove on the valve core when the piston moves backward to leave the beveled step of the valve core.

4. The automatic press-type precise liquid injection mechanism according to claim 3, characterized in that The piston moves backward to leave the beveled step of the valve core due to the friction between the piston and the inner wall of the valve core when the piston valve assembly moves forward, the front and rear cavities of the valve body being communicated through the liquid outlet groove on the valve core; the piston moves forward due to the friction between the piston and the inner wall of the valve core when the piston valve assembly moves backward, the piston valve assembly isolating the front and rear cavities of the valve body when the piston abuts against the beveled step of the valve core.

5. The automatic press-type precise liquid injection mechanism according to claim 3, characterized in that The beveled step of the valve core is provided with a beveled O-ring.

6. The automatic press-type precise liquid injection mechanism according to claim 3, wherein The valve core is buckled with the front end of the liquid outlet connector, the driving rod is buckled with the rear end of the liquid outlet connector, and a side hole is provided on a side wall of the liquid outlet connector and communicated with the liquid outlet groove on the valve core.

7. The automatic press-type precise liquid injection mechanism according to claim 3, characterized in that A negative pressure cavity plug is provided at a front end of the valve body, a waterproof plug is provided at a rear end of the valve body, and a waterproof sealing ring is provided on the negative pressure cavity plug and the waterproof plug.

8. The automatic press-type precise liquid injection mechanism according to claim 7, characterized in that A locking shaft is provided on the negative pressure cavity plug, an L-shaped clamping groove is provided at the front end of the valve body, and the locking shaft on the negative pressure cavity plug is inserted through the L-shaped clamping groove and then rotated to fix the negative pressure cavity plug at the front end of the valve body.

9. The automatic press-type precise liquid injection mechanism according to claim 3, characterized in that A liquid outlet check valve is installed on the liquid outlet opening, and a liquid inlet check valve is installed on the liquid inlet opening.

10. The automatic press-type precise liquid injection mechanism according to claim 3, wherein A water guide groove extending to the liquid outlet opening is provided in the liquid injection box.

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