Automatic liquid dispensing mechanism with crankshaft drive

Abstract

The utility model provides an automatic liquid throwing mechanism with crankshaft drive, which comprises a liquid storage tank installed on the door panel of a dishwasher, a liquid throwing box installed below the liquid storage tank, a valve body installed between the liquid storage tank and the liquid throwing box, a piston valve assembly installed in the valve body, a reciprocating drive mechanism installed at the rear end of the valve body and capable of driving the piston valve assembly to move forward and backward, a driving head of the reciprocating drive mechanism connected to the piston valve assembly, and a transverse long slot arranged on the driving head. The output end of an electric motor is provided with a driving gear, a driven gear and a crankshaft. When the electric motor drives the crankshaft to rotate, the driving head can be driven to move forward and backward through the cooperation of the transverse long slot. The utility model drives the driving head to move forward and backward through the crankshaft structure. One end of the crankshaft is inserted into a shaft sleeve. The crankshaft is used to rotate, support and limit the driven gear to prevent the driven gear from tilting due to uneven stress and improve the stability of the reciprocating drive mechanism.

Description

Technical Field

[0001] This utility model relates to a dishwasher accessory, specifically an automatic liquid dispensing mechanism with high stability of reciprocating drive mechanism, used for dispensing liquid into the 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] On August 12, 2022, the Patent Office published a liquid dispensing device with patent number 202220165493.4. The device includes a driver, a mounting cavity, a delivery pump, and a piston cylinder. The driver is located at the top of the mounting cavity, and the piston cylinder is located at the bottom of the mounting cavity, with the top of the piston cylinder communicating with the bottom of the mounting cavity. A piston assembly is located inside the piston cylinder. The delivery pump is connected to the output end of the piston cylinder and has an inlet and an outlet, both equipped with one-way valves. A moving wheel assembly is installed inside the mounting cavity. A drive gear is installed at the drive end of the driver, driving the moving wheel assembly to rotate. A movable push rod is installed on the moving wheel assembly, and the push rod, as the moving wheel assembly rotates, pushes the piston assembly mounted on the push rod to reciprocate. The device has an eccentric protrusion on the moving wheel assembly, which drives the push rod to move back and forth. However, the eccentric protrusion causes excessive resistance on one side of the moving wheel assembly, which can easily lead to the moving wheel assembly becoming jammed. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings and deficiencies of the prior art by providing an automatic liquid dispensing mechanism with high stability of the reciprocating drive mechanism for use in dishwashers.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: The automatic liquid dispensing mechanism with crankshaft drive 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. The reciprocating drive mechanism includes a drive housing and a motor and a drive head installed inside the drive housing. The front end of the drive head is connected to a piston valve assembly, and a transverse long slot is provided on the drive head. The output end of the motor is provided with a drive gear and a driven gear. A bushing is also provided inside the drive housing. The bushing is aligned with the central axis of the driven gear. A zigzag crankshaft is installed between the driven gear and the bushing. One end of the crankshaft is movably inserted into the bushing, and the other end passes through the transverse long slot of the drive head and is fixed to the end wall of the driven gear. When the motor drives the crankshaft to rotate, the drive head can be driven to reciprocate back and forth through the cooperation of the transverse long slot.

[0006] The piston valve assembly includes a valve stem connected to a drive head, a valve core at the front end of the valve stem, a liquid outlet groove on the valve core, and a piston fitted on the outside of the valve core. When the piston abuts 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 away from 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.

[0007] The outer wall of the piston is provided with grooves, and a rubber sealing ring is embedded in the grooves.

[0008] This invention uses a crankshaft structure to drive the drive head to reciprocate back and forth. One end of the crankshaft is inserted into a bushing. The crankshaft is used to rotate and support the driven gear, preventing the driven gear from tilting due to uneven force and improving the stability of the reciprocating drive mechanism. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model.

[0010] Figure 2 This is a schematic diagram of the reciprocating drive mechanism of this utility model.

[0011] Figure 3 This is a schematic diagram of the driven gear and crankshaft of this utility model.

[0012] Figure 4 This is a cross-sectional view of the structure of this utility model. Detailed Implementation

[0013] like Figure 1As shown in the figure, this utility model is an automatic liquid dispensing mechanism with crankshaft drive. It includes a liquid storage tank 10 installed on the door panel of a dishwasher, and a dispensing box 20 installed below the liquid storage tank 10. An automatic liquid dispensing module is installed between the liquid storage tank 10 and the dispensing box 20. The liquid storage tank 10 stores cleaning liquid, and the automatic liquid dispensing module automatically dispenses a measured amount of cleaning liquid into the dispensing box 20. The automatic liquid dispensing module includes a valve body 30. The front end of the valve body 30 is provided with an inlet 31 communicating with the upper liquid storage tank 10, and the rear side of the valve body 30 is provided with an outlet 32 ​​communicating with the dispensing box 20. The outlet 32 ​​is equipped with an outlet check valve, and the inlet 31 is equipped with an inlet check valve to prevent the cleaning liquid from flowing back.

[0014] like Figure 2 , Figure 3 As shown, a piston valve assembly is installed inside the valve body 30, 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 30. The reciprocating drive mechanism includes a drive housing 41, in which a motor 42 and a drive head 45 are installed. The front end of the drive head 45 is connected to the piston valve assembly, and a transverse long groove 46 is provided on the drive head 45. The output end of the motor 42 is provided with a drive gear 43 and a driven gear 44. A bushing 48 is also provided inside the drive housing 41. The bushing 48 and the central axis of the driven gear 44 are on the same straight line. A zigzag crankshaft 47 is installed between the driven gear 44 and the bushing 48. One end of the crankshaft 47 is movably inserted into the bushing 48, and the other end passes through the transverse long groove 46 of the drive head 45 and is fixed to the end wall of the driven gear 44. When the motor 42 drives the crankshaft 47 to rotate, it can drive the drive head 45 to reciprocate back and forth through the cooperation of the transverse long groove 46. The crankshaft 47 is used to provide rotational support and limit the driven gear 44, making the rotation of the driven gear 44 more stable.

[0015] like Figure 4As shown, the piston valve assembly is installed in the inner cavity of the valve body 30. The piston valve assembly includes a valve stem 33 connected to a drive head 45, a valve core 34 at the front end of the valve stem 33, a liquid outlet groove 37 on the valve core 34, and a piston 35 fitted on the outside of the valve core 34. When the piston 35 moves forward and abuts against the inclined step of the valve core 34, the piston valve assembly isolates the front and rear cavities of the valve body 30. The valve core 34 is engaged with the front end of the valve stem 33, and the drive head 45 is engaged with the rear end of the valve stem 33. A side hole communicating with the liquid outlet groove 37 on the valve core 34 is opened on the side wall of the valve stem 33. When the piston 35 moves backward and leaves the inclined step of the valve core 34, the front and rear cavities of the valve body 30 are connected through the liquid outlet groove 37 and the side hole on the valve core 34. A groove is provided on the outer wall of the piston 35, and a rubber sealing ring 36 is embedded in the groove. To ensure a tight seal between the piston 35 and the inner cavity of the valve body 30, since the piston 35 needs to move back and forth, the rubber sealing ring 36 is more wear-resistant and easy to replace, which can extend the life of the piston 35.

[0016] In this invention, when the piston valve assembly moves towards the front end of the valve body 30 under the action of the motor 42 and the drive head 45, the piston 35 remains stationary due to the friction with the inner wall of the valve core 34, moving away from the inclined step of the valve core 34 until it abuts against the valve stem 33. The piston 35 and valve stem 33 then move synchronously, and the front and rear chambers of the valve body 30 are connected through the liquid outlet groove 37 on the valve core 34 and the side hole of the valve stem 33, allowing the cleaning fluid in the front chamber of the valve body 30 to flow into the rear chamber. After the driven gear 44 rotates half a turn, the crankshaft 47 drives the drive head 45 to move forward, and the piston valve assembly also moves towards the rear end of the valve body 30. The piston 35 remains stationary due to the friction with the inner wall of the valve core 34 until it abuts against the inclined step of the valve core 34, isolating the front and rear chambers of the valve body 30. After the piston 35 abuts against the inclined step of the valve core 34, the piston 35 and the valve core 34 continue to move backward synchronously. A negative pressure is generated in the front chamber of the valve body 30, and the cleaning fluid in the storage tank 10 enters the front chamber of the valve body 30 through the inlet 31. The pressure in the rear chamber of the valve body 30 increases, and the cleaning fluid in the rear chamber is discharged into the liquid collection box 20 through the outlet 32. This invention uses a crankshaft 47 structure to drive the drive head 45 to reciprocate back and forth. One end of the crankshaft 47 is inserted into the bushing 48. The crankshaft 47 provides rotational support and limits the driven gear 44, preventing the driven gear 44 from tilting due to uneven force and improving the stability of the reciprocating drive mechanism.

Claims

1. An automatic liquid dispensing mechanism with crankshaft drive, comprising a liquid storage tank mounted on the door panel of a dishwasher, a liquid dispensing box mounted below the liquid storage tank, an automatic liquid dispensing module mounted between the liquid storage tank and the liquid dispensing box, the automatic liquid dispensing module comprising a valve body, an inlet port communicating with the upper liquid storage tank being provided at the front end of the valve body, and an outlet port communicating with the liquid dispensing box being provided on the rear side of the valve body; a piston valve assembly being mounted inside the valve body, and a reciprocating drive mechanism capable of driving the piston valve assembly to move back and forth being mounted at the rear end of the valve body; Its features The reciprocating drive mechanism includes a drive housing and a motor and a drive head installed inside the drive housing. The front end of the drive head is connected to a piston valve assembly, and a transverse long slot is provided on the drive head. The output end of the motor is provided with a drive gear and a driven gear. A bushing is also provided inside the drive housing. The bushing is aligned with the central axis of the driven gear. A zigzag crankshaft is installed between the driven gear and the bushing. One end of the crankshaft is movably inserted into the bushing, and the other end passes through the transverse long slot of the drive head and is fixed to the end wall of the driven gear. When the motor drives the crankshaft to rotate, the drive head can be driven to reciprocate back and forth through the cooperation of the transverse long slot.

2. The automatic liquid dispensing mechanism with crankshaft drive according to claim 1, characterized in that... The piston valve assembly includes a valve stem connected to a drive head, a valve core at the front end of the valve stem, a liquid outlet groove on the valve core, and a piston fitted on the outside of the valve core. When the piston abuts against the inclined step of the valve core, the piston valve assembly isolates the front and rear chambers of the valve body. The piston then moves away from 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.

3. The automatic liquid dispensing mechanism with crankshaft drive according to claim 2, characterized in that... The outer wall of the piston is provided with grooves, and a rubber sealing ring is embedded in the grooves.

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