Intelligent automatic liquid feeding mechanism driven by screw rod in reciprocating mode

Abstract

An intelligent screw reciprocating driving automatic liquid feeding mechanism comprises a liquid storage tank and a liquid feeding box, an automatic liquid feeding module is installed between the liquid storage tank and the liquid feeding box and comprises a valve body, a driving fixing seat is installed at the rear end of the valve body, a push rod is installed on the driving fixing seat, the front end of the push rod stretches into the valve body, and the front end of the push rod stretches into the valve body. The piston is installed on the push rod, and automatic liquid feeding is achieved through front-back movement of the push rod. A driving nut is installed in the driving fixing base, an internal thread blind hole is formed in the front end of the driving nut, a sealing ring is arranged between the outer wall of the driving nut and the driving fixing base, and when the driving nut rotates, liquid in the valve body is isolated from overflowing backwards. When the driving nut rotates to drive the push rod to stretch and retract back and forth, the sealing performance can be effectively ensured, liquid in the valve body is prevented from overflowing backwards, and the influence on the service life of a power device is prevented. The device has the advantages of simple and reasonable structure and accurate and reliable liquid feeding, and has a good market prospect.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of accessories of dish washer, specifically a kind of mechanism for automatically dispensing cleaning solution for dish washer. BACKGROUND

[0002] Dish washer is a very practical cleaning tool, it can effectively remove dirt and bacteria inside dish washer, so as to ensure the health and cleanliness of tableware. The dish washer on the market basically needs to manually add cleaning solution. Each time washes dish, it needs to pour dish washer cleaning liquid into the detergent box inside dish washer first, and the use amount of dish washer cleaning agent is determined according to the instruction manual of product. We need to carefully read the instruction manual and use the appropriate amount of cleaning agent according to the requirement, so the operation is very troublesome.

[0003] The patent office disclosed on November 25, 2022, patent number 202210965199.6, a kind of quantitative dispensing of washing liquid distributor, including washing liquid dispensing box, with the washing liquid dispensing box adaptation installation washing liquid storage cavity and transmission mechanism;The transmission mechanism and washing liquid storage cavity are all equipped with one-way flow valve;The washing liquid dispensing box is equipped with liquid injection port and liquid outlet, the liquid injection port is in communication with the washing liquid storage cavity one-way;The washing liquid storage cavity, transmission mechanism and the liquid outlet are sequentially one-way communicated through the one-way flow valve, and the transmission mechanism and the one-way flow valve are mutually matched to make washing liquid from the liquid outlet quantitative output, through the mutual cooperation of one-way flow valve, transmission mechanism, washing liquid storage cavity and washing liquid dispensing box, washing liquid is circulated and quantitatively dispensed according to the set direction. The transmission mechanism of this structure needs to move forward and backward, cannot set effective seal, is easy to cause liquid to seep out, thereby affecting the service life of rear power mechanism. SUMMARY

[0004] The utility model aims at the defects and deficiencies of the prior art, and provides an automatic liquid dispensing device that can effectively ensure sealing and prevent liquid in the valve body from overflowing backward, for liquid dispensing for dish washer.

[0005] The utility model discloses an automatic liquid injection mechanism of intelligent screw rod reciprocating drive which is installed on the door plate of a dishwasher, and comprises a liquid storage tank, a liquid injection box, an automatic liquid injection module, a valve body, a push rod, a piston, a drive fixed base, a drive nut, a drive gear, a power device, a guide sleeve, a screw rod, a sealing ring, a plurality of concave teeth, a plurality of convex teeth, a plurality of guide strips, a plurality of guide grooves, a plurality of liquid outlet grooves, a limit sleeve, a limit circuit and a circuit board.

[0006] The guide sleeve is inserted into the drive fixed base, and the convex teeth are engaged with the concave teeth to fix the guide sleeve and the drive fixed base.

[0007] The guide strips and the guide grooves limit the rotation of the push rod.

[0008] The push rod is provided with a plurality of liquid outlet grooves at the front end of the circumferential wall, and a slope step is arranged at the rear end of the liquid outlet grooves.

[0009] The push rod is provided with a limit sleeve at the front end, and the limit sleeve limits the front side of the piston.

[0010] After the push rod is inserted into the valve body, the piston moves backward and is attached to the slope step to isolate the front cavity and the rear cavity of the valve body.

[0011] The power device comprises a motor and a speed reduction gear box.

[0012] The power device is provided with a circuit board on the outside, and a limit circuit is arranged on the circuit board.

[0013] The liquid injection box is provided with a liquid outlet sleeve, the liquid outlet of the valve body is inserted into the liquid outlet sleeve, the liquid outlet sleeve is communicated with the inner cavity of the liquid injection box, a cover plate is arranged outside the inner cavity of the liquid injection box, a plurality of through holes opposite to the liquid outlet sleeve are formed in the cover plate, and the inner cavity of the liquid injection box is communicated with the inside of the dishwasher.

[0014] The utility model discloses when driving nut rotation drives push rod telescoping, can effectively ensure the leakproofness, insulates the liquid in valve body and overflows backward, prevents the influence to the life of power device. The limiting circuit on the circuit board is used for controlling the positive and negative rotation of motor, when push rod forward and backward movement hits the limit, the current generated by motor exceeds the setting value, automatically converts the positive and negative pole of current, makes motor reverse rotation. It has the advantages of simple structure, accurate and reliable liquid injection, and good market prospect. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 is a structural schematic diagram of the utility model.

[0016] Fig. 2 is a structural schematic diagram of the liquid injection box of the utility model.

[0017] Fig. 3 is a sectional view of the connecting structure of the liquid injection box of the utility model.

[0018] Fig. 4 is a structural schematic diagram of the automatic liquid injection device of the utility model.

[0019] Fig. 5 is a sectional view of the automatic liquid injection device of the utility model.

[0020] Fig. 6 is a structural schematic diagram of the valve body of the utility model.

[0021] Fig. 7 is a structural schematic diagram of the driving nut of the utility model.

[0022] Fig. 8 is a structural exploded view of the push rod, the piston and the limiting sleeve of the utility model.

[0023] Fig. 9 is a structural exploded view of the guide sleeve and the driving fixed seat of the utility model.

[0024] Fig. 10 is a structural sectional view when the push rod of the utility model is forwardly extended.

[0025] Fig. 11 is a structural sectional view when the push rod of the utility model is backwardly retracted. DETAILED DESCRIPTION

[0026] As shown in Figure 1, the utility model is a kind of automatic liquid injection mechanism of intelligent screw rod reciprocating drive, it includes the liquid tank 10 of installation on the door plate of dishwasher, when the door plate of dishwasher is closed, liquid tank 10 is in upright state, cleaning fluid will accumulate in the bottom of liquid tank 10.The bottom side of the liquid tank 10 is provided with liquid level sensor 11, for detecting the cleaning fluid capacity of liquid tank 10 to measure.Because the high viscosity of cleaning fluid, weak fluidity, resulting in detection needs long time to wait, and there is also the possibility of abnormal detection result due to its tackiness.Therefore the liquid level sensor 11 adopts multi-pole piece capacitance type response, and multiple pole pieces are placed in different positions in the liquid tank 10, through the data acquisition of the output signal of pole piece, after filtering part and calibration algorithm, obtain initial effective data, then effective data is analyzed and amplitude, frequency etc. Characteristic value extraction, comprehensive determination.In addition, liquid level sensor 11 can also use ultrasonic compensation unit, light sensing distance compensation unit, mass compensation unit gain compensation, temperature compensation unit gain compensation and so on, to realize the liquid level determination of high viscosity cleaning fluid.

[0027] Liquid injection box 20 is installed below the liquid tank 10, and an automatic liquid injection module is installed between the liquid tank 10 and the liquid injection box 20.

[0028] As shown in Figure 2 and Figure 3, the liquid injection box 20 is provided with an inner cavity 21, and a liquid injection port 22 connected with the liquid tank 10 is formed in the bottom of the inner cavity 21 of the liquid injection box 20, for injecting liquid into the liquid tank 10, and a cover plate 25 is arranged outside the inner cavity 21 of the liquid injection box 20, the cover plate 25 is hinged to the liquid injection box 20 through end shafts at both ends, and a lock groove 28 is arranged on the side away from the end shafts, and a lock catch 23 is arranged at the corresponding position of the liquid injection box 20, and the cover plate 25 is locked through the lock catch 23 and the lock groove 28 after being closed.

[0029] The back of the liquid injection box 20 is provided with a liquid outlet sleeve 24 for inserting the liquid outlet 51 of the valve body 50 of the automatic liquid injection module, the liquid outlet sleeve 24 is communicated with the inner cavity 21 of the liquid injection box 20, and a plurality of through holes 26 opposite to the liquid outlet sleeve 24 are formed in the cover plate 25, and the inner cavity 21 of the liquid injection box 20 can also be communicated with the inside of the dishwasher through the through holes 26 when the cover plate 25 is closed.

[0030] As shown in FIG. 4, FIG. 5, FIG. 6, the automatic liquid injection module includes a valve body 50, the side of the valve body 50 is provided with an upper liquid tank 10 connected liquid inlet 52, the liquid inlet 52 is installed with liquid inlet check valve, the front end of the valve body 50 is provided with a liquid outlet 51 connected with the liquid injection box 20, the liquid outlet 51 is installed with liquid outlet check valve. Therefore the cleaning liquid in the liquid tank 10 can only enter the valve body 50 through the liquid inlet check valve from the liquid inlet 52, and then through the liquid outlet check valve, and then be discharged into the liquid injection box 20 from the liquid outlet 51. The rear end of the valve body 50 is provided with a flange 53, the front end of the drive fixed seat 30 is butted with the rear end of the valve body 50 through the flange 53. The drive fixed seat 30 is provided with a push rod 80, the front end of the push rod 80 extends into the valve body 50. The drive fixed seat 30 is also provided with a drive nut 110, the drive nut 110 is installed at the rear end of the push rod 80, and the drive nut 110 can drive the push rod 80 to extend forward and backward when it rotates.

[0031] The rear end of the drive fixed seat 30 is provided with a power device, the power device can drive the drive nut 110 to rotate. The power device includes a motor 40 and a speed reducer gear box 42. The power device is provided with a circuit board 41 outside, the circuit board 41 is provided with a limit circuit, the limit circuit on the circuit board 41 is used to control the forward and reverse rotation of the motor 40, when the push rod 80 moves forward and backward and hits the limit, the current generated by the motor 40 exceeds the set value, the positive and negative poles of the current are automatically converted, so that the motor 40 rotates reversely. It has the advantages of simple and reasonable structure, accurate and reliable liquid injection, and good market prospect.

[0032] As shown in Fig. 7, the drive nut 110 rear side is provided with a drive gear 113, the drive gear 113 is engaged with the output end of the reduction gear box 42, so the motor 40 rotates, through the reduction gear box 42 transmission, can drive the drive nut 110 rotation. In the outer side of the drive nut 110 is also equipped with bearing 60, to reduce the friction of the drive nut 110 rotation, while ensuring the concentricity of rotation. The front end of the drive nut 110 is provided with an internal thread blind hole 112, the rear end of the push rod 80 is provided with a screw rod 84 connected with the internal thread blind hole 112. The outer wall of the drive nut 110 and the drive fixed seat 30 are provided with a sealing ring 111, which prevents the liquid in the valve body 50 from overflowing backward when the drive nut 110 rotates. The setting of the internal thread blind hole 112 and the sealing ring 111 completely eliminates the possibility of liquid backflow, preventing the life of the power device. In order to prevent the displacement of the sealing ring 111 when the drive nut 110 rotates, the sealing ring groove is opened in the outer wall of the drive nut 110 and the inner wall of the drive fixed seat 30.

[0033] As shown in Fig. 8, the front end of the push rod 80 is provided with a plurality of liquid outlet grooves 81, the liquid outlet grooves 81 extend axially forward until the end of the front end of the push rod 80, and the rear end of the liquid outlet grooves 81 is provided with a bevel step 82. The front end of the push rod 80 is provided with a movable piston 90, the material of the piston 90 is PP soft plastic, which needs a certain hardness. The front end of the push rod 80 is provided with a limiting sleeve 100, which limits the front side of the piston 90, the distance between the limiting sleeve 100 and the bevel step 82 is the moving distance of the piston 90 on the push rod 80. After the push rod 80 extends into the valve body 50, the piston 90 moves backward and fits with the bevel step 82, which can isolate the front cavity 54 and the rear cavity 55 of the valve body 50. After the piston 90 moves forward and leaves the bevel step 82, the front cavity 54 and the rear cavity 55 of the valve body 50 are connected through the liquid outlet grooves 81. The rear end of the piston 90 is provided with a horn 91 which can fit with the bevel step 82, to ensure close fitting, so that the front cavity 54 and the rear cavity 55 of the valve body 50 are completely isolated.

[0034] As shown in FIG. 9, the outer wall of the guide sleeve 70 is provided with a plurality of concave teeth 72, and the inner wall of the front end of the driving fixed seat 30 is provided with a plurality of convex teeth 31. After the guide sleeve 70 is inserted into the driving fixed seat 30, the convex teeth 31 are engaged with the concave teeth 72, and the guide sleeve 70 is fixed with the driving fixed seat 30. An outer seal 71 is further provided on the outside of the guide sleeve 70. After the driving fixed seat 30 is connected with the valve body 50, the outer seal 71 can ensure that the liquid in the valve body 50 does not overflow to the outside of the connection. The circumferential wall of the push rod 80 is uniformly provided with a plurality of guide strips 83, and the inside of the guide sleeve 70 is provided with corresponding guide grooves 73. The guide strips 83 and the guide grooves 73 limit the rotation of the push rod 80. Therefore, the forward and reverse rotation of the driving nut 110 can drive the push rod 80 to stretch and retract forward and backward.

[0035] As shown in FIG. 10 and FIG. 11, the motor 40 works to make the push rod 80 stretch forward, and the piston 90 moves backward relative to the push rod 80 under the resistance of the cleaning liquid until the horn mouth 91 at the rear end of the piston 90 is in close contact with the inclined stepped surface 82 of the push rod 80, thereby completely isolating the front cavity 54 from the rear cavity 55 of the valve body 50. The push rod 80 continues to stretch forward, and the cleaning liquid in the front cavity 54 of the valve body 50 is discharged to the liquid throwing box 20 through the liquid outlet check valve and is applied after being washed by water. The rear cavity 55 of the valve body 50 is isolated from the front cavity 54, so that negative pressure is generated, and the cleaning liquid in the liquid storage tank 10 enters the rear cavity 55 of the valve body 50 through the liquid inlet check valve. After the front cavity 54 is isolated from the rear cavity 55, the liquid inlet and the liquid outlet do not interfere with each other, and the problem of unsmooth liquid inlet or liquid outlet does not occur.

[0036] When the motor 40 works to make the push rod 80 retract backward, the piston 90 moves forward relative to the push rod 80 under the resistance of the cleaning liquid until the piston 90 abuts against the limiting sleeve 100 at the front end, and after the horn mouth 91 of the piston 90 is separated from the inclined stepped surface 82, the front cavity 54 of the valve body 50 is connected with the rear cavity 55 through the liquid outlet groove 81. The push rod 80 continues to retract backward, and the cleaning liquid in the rear cavity 55 of the valve body 50 flows into the front cavity 54 through the liquid outlet groove 81. The distance of backward movement of the push rod 80 can accurately control the volume of the cleaning liquid entering the front cavity 54, so that the liquid can be accurately used in the next throwing, and waste is avoided.

[0037] The utility model discloses a drive nut 110 rotation drive push rod 80 telescopic when, can effectively ensure the leakproofness, insulate the liquid in valve body 50 and overflow backward, prevent the life of power device from being influenced. The limit circuit on circuit board 41 is used for controlling the positive and negative rotation of motor 40, when push rod 80 forward and backward movement hits the limit, the current of motor 40 exceeds the set value, and the positive and negative pole of automatic conversion current makes motor 40 reverse rotation. It has simple and reasonable structure, and the advantages such as accurate and reliable injection, good market prospect.

Claims

1. An intelligent screw reciprocating driven automatic liquid dispensing mechanism, comprising a liquid storage tank installed on the door panel of a dishwasher, a liquid dispensing box installed below the liquid storage tank, an automatic liquid dispensing module installed 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 provided on the side of the valve body, an outlet port communicating with the liquid dispensing box provided at the front end of the valve body, and a drive fixing seat installed at the rear end of the valve body; a push rod extending into the valve body is installed on the drive fixing seat, and a piston is installed on the push rod, the automatic liquid dispensing is realized by the back-and-forth movement of the push rod; Its features A drive nut is installed inside the drive fixing seat, a drive gear is provided on the rear side of the drive nut, and a power device is provided on the rear side of the drive fixing seat. The output end of the power device meshes with the drive gear. The front end of the drive nut is provided with an internally threaded blind hole; the front end of the drive fixed seat is provided with a guide sleeve, the push rod is movably inserted into the guide sleeve, and the guide sleeve limits the rotation of the push rod; the rear end of the push rod is provided with a screw connected to the internally threaded blind hole, the rotation of the drive nut can drive the push rod to move back and forth, and a sealing ring is provided between the outer wall of the drive nut and the drive fixed seat, which prevents the liquid in the valve body from overflowing backward when the drive nut rotates.

2. The intelligent screw reciprocating automatic liquid dispensing mechanism according to claim 1, characterized in that... The guide sleeve has multiple concave teeth on its outer wall and multiple convex teeth on the inner wall of the front end of the drive fixing seat. After the guide sleeve is inserted into the drive fixing seat, the convex teeth and concave teeth mesh, and the guide sleeve is fixed to the drive fixing seat.

3. The intelligent screw reciprocating drive automatic liquid dispensing mechanism according to claim 1, characterized in that... The push rod has multiple guide strips evenly distributed on its peripheral wall, and a corresponding guide groove is provided inside the guide sleeve. The guide strips and guide groove limit the rotation of the push rod.

4. The intelligent screw reciprocating drive automatic liquid dispensing mechanism according to claim 1, characterized in that... The front end of the push rod has multiple liquid outlet grooves on its peripheral wall, and a sloping step is provided at the rear end of the liquid outlet grooves. A piston that can move back and forth is fitted at the front end of the push rod. When the piston moves backward and fits against the sloping step, the front cavity and rear cavity of the valve body are isolated. After the piston moves forward and leaves the sloping step, the front cavity and rear cavity of the valve body are connected through the liquid outlet grooves.

5. The intelligent screw reciprocating drive automatic liquid dispensing mechanism according to claim 4, characterized in that... The push rod has a limiting sleeve at its front end, which limits the front side of the piston.

6. The intelligent screw reciprocating drive automatic liquid dispensing mechanism according to claim 1, characterized in that... The power unit includes a motor and a reduction gearbox.

7. The intelligent screw reciprocating drive automatic liquid dispensing mechanism according to claim 6, characterized in that... The power unit is equipped with a circuit board on its outer side, and a limit circuit is provided on the circuit board. When the current exceeds the set value, the limit circuit can control the motor to rotate in the opposite direction.

8. The intelligent screw reciprocating drive automatic liquid dispensing mechanism according to claim 1, characterized in that... The liquid dispensing box is equipped with a liquid outlet sleeve, and the liquid outlet of the valve body is inserted into the liquid outlet sleeve. The liquid outlet sleeve is connected to the inner cavity of the liquid dispensing box. A cover plate is provided on the outer side of the inner cavity of the liquid dispensing box, and multiple through holes are opened on the cover plate opposite to the liquid outlet sleeve, so that the inner cavity of the liquid dispensing box is connected to the inside of the dishwasher.

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