Leak-proof metering pump

Abstract

The utility model discloses a leak -stoppage metering pump, increase the anti -leak mechanism on the structure of metering pump, design special upper cover sealing convex edge and plug and resist the sealing gasket on anti -leak mechanism, reach the anti -leak at the same time, do not influence the precision of metering pump, simultaneously, the liquid of water outlet hole is turned through the right angle through -hole and is tangent to the outermost circle of rotor rotation, makes rotor rotation start rotation more sensitive, and the measurement is more accurate, set up the magnet in the rotor pivot center, reduce the interference of magnet rotation inertia force to rotor rotation, make the measurement more accurate, the upper and lower shaft conical design of rotor, need not penetrate the upper cover and metering installation box, and the friction is small, and rotor rotates smoothly, and the service life is long, and the measurement precision is higher.

Description

TECHNICAL FIELD

[0001] The utility model relates to pump equipment technical field, more specifically, the utility model mainly relates to a leakproof metering pump. BACKGROUND

[0002] When the liquid level of the inlet end is higher than the liquid outlet of the motor pump, the greater the difference between the liquid level of the inlet end and the outlet end, the more liquid will flow out of the motor pump outlet due to gravity, and the greater the vertical distance between the inlet end and the outlet end, the more liquid will flow out of the outlet. When the appliance is not in use, liquid leakage into the appliance or outside the appliance will occur due to the presence of liquid in the liquid storage tank of the appliance, resulting in liquid entering the storage area and associated equipment, which poses a safety hazard. Therefore, improvements need to be made to the structure of the metering pump. SUMMARY

[0003] The utility model discloses to solve the technical problem that the metering pump cannot prevent leakage in the prior art.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme:

[0005] The utility model provides a leakproof metering pump, including base, motor fixed in the lower side of base, crank drive mechanism with motor power connection, pumping mechanism fixed in the upper side of base and with crank drive mechanism power connection, the coupler of sealed fixed suit is installed on the upper side of pumping mechanism, the upper side of coupler is sealed and is provided with leakproof mechanism and is sealed with upper cover, the center of upper cover is provided with water outlet hole, the upper side of water outlet hole is communicated with water outlet pipe through metering assembly, the lateral edge of center of upper cover is provided with water inlet hole and is communicated with the water inlet pipe of upper cover upper side, the outer side of water inlet hole is provided with first sealing convex edge and is directly communicated with the water inlet channel of leakproof mechanism, the lateral edge of water outlet hole of upper cover is provided with water outlet groove, the water outlet hole and water outlet groove are communicated through plug, the outer side of water outlet hole and the convex edge of plug bottom are surrounded and provided with second sealing convex edge and are sealed to the upper side of leakproof mechanism, the outer side of water outlet groove and the convex edge of plug bottom are surrounded and provided with third sealing convex edge and are directly communicated with the water outlet channel of leakproof mechanism.

[0006] Further, the metering assembly comprises a steering boss arranged at the center of the upper side of the cover, and a metering installation box arranged outside the steering boss is covered by the upper sealing ring; the upper end of the metering installation box is fixedly connected with and communicated with the water outlet pipe; a right-angle through hole is arranged in the steering boss to communicate with the water outlet hole of the cover; a rotor installation table is arranged in front of the outlet of the right-angle through hole; a rotor is rotatably arranged between the rotor installation table and the metering installation box; a magnet is arranged on the rotor; a fan blade is arranged on the side of the rotor in the direction of the outlet of the right-angle through hole; a Hall sensor PCB is arranged on the outer side of the metering installation box; and the Hall sensor PCB is located on the side of the rotor.

[0007] Further, the direction of the outlet of the right-angle through hole is tangent to the outermost circle of the rotor.

[0008] Further, the magnet is arranged at the center of the rotation shaft of the rotor.

[0009] Further, tapered holes corresponding to the tapered shafts are arranged in the inner sides of the rotor installation table and the metering installation box.

[0010] Further, the included angle between the two side waist lines on the side of the tapered hole is 50°.

[0011] Further, the leakage prevention mechanism comprises a spring, a movable sealing gasket, a shunt disc, and an upper sealing gasket.

[0012] The movable sealing gasket is provided with an annular sealing boss, a liquid outlet hole one, and a liquid inlet hole one; the liquid outlet hole one is located opposite to the liquid outlet passage of the connector; and the liquid inlet hole one is located opposite to the liquid inlet passage of the connector.

[0013] The shunt disc is provided with a sealing recessed table opposite to the annular sealing boss; the center of the sealing recessed table of the shunt disc is provided with a liquid outlet hole two; the shunt disc is provided with a liquid inlet hole two opposite to the position of the liquid inlet hole one; the shunt disc is provided with a liquid outlet hole three opposite to the position of the liquid outlet hole one; the liquid outlet hole three is in communication with the annular edge of the sealing recessed table on the other side close to the movable sealing gasket and is provided with a guide hole downward opposite to the annular sealing boss; the liquid outlet hole three is in communication with the liquid outlet passage of the connector through the liquid outlet hole one; and the liquid outlet hole three is in communication with the liquid outlet hole two through the guide hole.

[0014] The upper sealing gasket is provided with a liquid inlet hole three opposite to the position of the liquid inlet hole two; and the upper sealing gasket is provided with a liquid outlet hole four opposite to the position of the liquid outlet hole two.

[0015] The movable sealing gasket is abutted by the spring at the center of the annular sealing boss and is movably arranged between the lower side of the shunt disc and the upper side of the connector; and the upper sealing gasket is pressed by the cover to be close to the upper side of the shunt disc.

[0016] The upper cover inlet pipe is communicated with the liquid inlet channel on the connector through the liquid inlet hole three, the liquid inlet hole two and the liquid inlet hole one in sequence, and the upper cover outlet pipe is communicated with the liquid outlet channel on the connector through the metering assembly, the liquid outlet hole four, the liquid outlet hole two, the guide hole, the liquid outlet hole three and the liquid outlet hole one in sequence.

[0017] Further, the crank transmission mechanism comprises a crank, a shaft and a connecting rod, the crank is fixed on the motor power shaft to realize power connection, the connecting rod is fixedly connected with the crank through the shaft, and the connecting rod is in a three-blade sheet structure, the blades are provided with connecting holes and face the pumping mechanism, and the connecting rod blades are power-connected with the pumping mechanism to provide power.

[0018] Further, the pumping mechanism is an umbrella membrane pumping mechanism, comprising a diaphragm, a diaphragm support, a small umbrella valve, a valve support, a large umbrella valve, an outer ring sealing ring and an inner ring sealing ring, the diaphragm is in a three-branch foot corresponding to three membrane chamber structure, the three branch feet of the diaphragm are power-connected with the crank transmission mechanism, the diaphragm support presses the diaphragm and is fixed on the upper side of the base, the small umbrella valve is movably fixed on the valve support and seals the three membrane chambers of the diaphragm, the valve support is fixed on the upper side of the diaphragm support, the valve support is provided with an upward channel in the center, the large umbrella valve is movably arranged in the middle part of the connector and seals the upward channel of the valve support on the lower side, the upper side of the valve support clamps the outer ring sealing ring and abuts against the lower side outer ring of the connector, and the upper side of the valve support clamps the inner ring sealing ring and abuts against the lower side inner ring of the connector.

[0019] Compared with the prior art, the utility model has the advantages that: the anti-leakage mechanism is added to the structure of the metering pump, the special upper cover sealing convex edge and the plug abut against the sealing gasket of the anti-leakage mechanism, the precision of the metering pump is not affected while achieving the anti-leakage effect; the liquid outlet hole is turned to be tangent to the outermost circle of the rotor rotation through the right-angle through hole, the rotor rotation is more sensitive, and the metering is more accurate; the magnet is arranged at the center of the rotor rotating shaft, the interference of the magnet rotation inertia force on the rotor rotation is reduced, and the metering is more accurate; the upper and lower shafts of the rotor are designed in a conical shape, the upper cover and the metering installation box are not penetrated, the friction is small, the rotor rotates smoothly, the service life is long, and the metering precision is higher. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a split schematic view of the anti-leakage metering pump in the embodiment of the utility model;

[0021] Figure 2 It is a schematic view of the upper cover structure in the embodiment of the utility model;

[0022] Figure 3 It is a schematic view of the anti-leakage mechanism structure in the embodiment of the utility model.

[0023] The following is the explanation of the reference signs:

[0024] 1 is base, 2 is motor, 3 is crank drive mechanism, 31 is crank, 32 is shaft, 33 is connecting rod, 4 is pumping mechanism, 41 is diaphragm, 42 is diaphragm support, 43 is small umbrella valve, 44 is valve support, 45 is big umbrella valve, 46 is outer ring sealing ring, 47 is inner ring sealing ring, 48 is upward passage, 5 is coupler, 51 is liquid outlet passage, 52 is liquid inlet passage, 6 is leak-proof mechanism, 61 is spring, 62 is movable sealing gasket, 621 is annular sealing boss, 622 is liquid outlet hole one, 623 is liquid inlet hole one, 63 is shunt disc, 631 is sealing concave, 632 is liquid outlet hole two, 633 is liquid inlet hole two, 634 is liquid outlet hole three, 635 is guide hole, 64 is upper sealing gasket, 641 is liquid inlet hole three, 642 is liquid outlet hole four, 7 is upper cover, 71 is water outlet hole, 72 is water inlet hole, 73 is first sealing convex edge, 74 is water outlet groove, 75 is plug, 76 is second sealing convex edge, 77 is third sealing convex edge, 8 is metering assembly, 81 is turning boss, 82 is upper sealing ring, 83 is metering installation box, 84 is right-angle through hole, 85 is rotor installation table, 86 is rotor, 87 is Hall sensor PCB board, 88 is conical shaft, 89 is conical hole, 9 is water outlet pipe, 10 is water inlet pipe. DETAILED DESCRIPTION

[0025] The utility model will be further described below with reference to the drawings.

[0026] Reference Figure 1 And Figure 2 As shown in the figure, the embodiment of the utility model is a leak-proof metering pump, which comprises a base 1, a motor 2 fixed on the lower side of the base 1, a crank drive mechanism 3 connected with the motor 2, a pumping mechanism 4 fixed on the upper side of the base 1 and connected with the crank drive mechanism 3, and a coupler 5 sealingly sleeved on the upper side of the pumping mechanism 4. Importantly, the coupler 5 is sealingly connected with an upper cover 7 after being provided with a leak-proof mechanism 6 on the upper side. The center of the upper cover 7 is provided with a water outlet hole 71, the upper side of the water outlet hole 71 is connected with a water outlet pipe 9 through a metering assembly 8, the center side of the upper cover 7 is provided with a water inlet hole 72 connected with a water inlet pipe 10 on the upper side of the upper cover 7, the outer side of the water inlet hole 72 is provided with a first sealing convex edge 73 abutting against the outer ring of the water inlet passage of the leak-proof mechanism 6 to be directly connected with the water inlet passage of the leak-proof mechanism 6, the side of the water outlet hole 71 of the upper cover 7 is provided with a water outlet groove 74, the water outlet hole 71 and the water outlet groove 74 are connected through a plug 75, the outer side of the water outlet hole 71 and the convex edge surrounding the bottom of the plug 75 are provided with a second sealing convex edge 76 abutting against the upper side of the leak-proof mechanism 6 to be airtight, and the outer side of the water outlet groove 74 and the convex edge surrounding the bottom of the plug 75 are provided with a third sealing convex edge 77 abutting against the outer ring of the water outlet passage of the leak-proof mechanism 6 to be directly connected with the water outlet passage of the leak-proof mechanism 6.

[0027] The main feature of this utility model is that a leak-proof mechanism 6 is added to the structure of the metering pump. A special upper cover 7 with a sealing flange and a plug 75 are designed to abut against the upper side of the leak-proof mechanism 6, so as to achieve leak prevention without affecting the accuracy of the metering pump.

[0028] In some embodiments, reference Figure 1 As shown, the metering component 8 includes a steering boss 81 located at the center of the upper side of the upper cover 7, and a metering mounting box 83 located outside the steering boss 81 covered by an upper sealing ring 82. The upper outer side of the metering mounting box 83 is fixedly connected to and communicates with the water outlet pipe 9. A right-angle through hole 84 is provided in the steering boss 81 to communicate with the water outlet hole 71 of the upper cover 7. A rotor mounting platform 85 is provided in front of the outlet of the right-angle through hole 84 on the upper side of the steering boss 81. A rotor 86 is rotatably mounted between the rotor mounting platform 85 and the metering mounting box 83. A magnet is provided on the rotor 86. The side of the rotor 86... The fan blades are positioned at the upper outlet direction of the vertical right-angle through-hole 84. A Hall sensor PCB board 87 is mounted on the outer side of the metering mounting box 83, located on the side of the rotor 86. This metering structure is compact. Water flow drives the rotor (which contains a rubber-coated magnet) through the outlet of uniform diameter. The flow rate is constant per rotor revolution. Each rotor revolution is accompanied by a Hall chip on the side Hall sensor PCB board collecting a signal (pulse). Users can set the desired pulse signal via the main control board to control the flow rate. This design offers the following advantages: 1. The built-in flow meter at the outlet ensures more accurate and repeatable flow, meeting the needs of high-end customers; 2. The product is modular and easy to install; 3. It simplifies piping, reduces costs, and enhances market competitiveness.

[0029] Furthermore, in some embodiments, in order to make the rotor easier to rotate, the upper outlet direction of the right-angle through hole 84 is tangent to the outermost ring of the rotor 86. This design maximizes the impact arm of the water flow and the rotation force, making the rotor rotation start more sensitive and the metering more accurate.

[0030] Furthermore, in some embodiments, in order to reduce the impact of uneven mass distribution on rotor rotation, a magnet is placed at the center of the rotor 86 shaft to reduce the interference of the magnet's rotational inertial force on rotor rotation, making the measurement more accurate.

[0031] Furthermore, in some embodiments, in order to reduce the friction of the rotor 86 rotation, the rotor 86 is provided with tapered shafts 88 at both the top and bottom. The rotor mounting platform and the inner side of the metering mounting box are provided with tapered holes 89 corresponding to the tapered shafts 88. The tapered design of the upper and lower shafts of the rotor 86 does not require penetrating the upper cover 7 and the metering mounting box 83, resulting in low friction, smooth rotor rotation, long service life, and higher metering accuracy.

[0032] Further, in some embodiments, the two side lines of the conical hole 89 are opposite to each other at an angle of 50°, which is the optimal angle obtained through experimental tests, under the premise of ensuring the service life, the friction is small, the rotor 86 rotates smoothly, thereby improving the measurement accuracy.

[0033] In some embodiments, referring to Figure 1 and Figure 3 , one of the leak-proof mechanisms 6 is as follows: including a spring 61, a movable sealing gasket 62, a shunt disc 63, and an upper sealing gasket 64.

[0034] The movable sealing gasket 62 is provided with an annular sealing boss 621, a liquid outlet hole one 622, and a liquid inlet hole one 623, the liquid outlet hole one 622 is opposite to the position of the liquid outlet channel 51 of the coupler 5, and the liquid inlet hole one 623 is opposite to the position of the liquid inlet channel 52 of the coupler 5.

[0035] The shunt disc 63 is provided with a sealing recess 631 opposite to the annular sealing boss 621, the center of the sealing recess 631 of the shunt disc 63 is provided with a liquid outlet hole two 632, the shunt disc 63 is provided with a liquid inlet hole two 633 opposite to the position of the liquid inlet hole one 623, the shunt disc 63 is provided with a liquid outlet hole three 634 opposite to the position of the liquid outlet hole one 622, the liquid outlet hole three 634 is in communication with the annular edge of the sealing recess 631 on the other side close to the movable sealing gasket 62 and is provided with a guide hole 635 downwardly opposite to the annular sealing boss 621, the liquid outlet hole three 634 is in communication with the liquid outlet channel 51 of the coupler 5 through the liquid outlet hole one 622, and the liquid outlet hole three 634 is in communication with the liquid outlet hole two 632 through the guide hole 635.

[0036] The upper sealing gasket 64 is provided with a liquid inlet hole three 641 opposite to the position of the liquid inlet hole two 633, and is provided with a liquid outlet hole four 642 opposite to the position of the liquid outlet hole two 632.

[0037] The movable sealing gasket 62 is pressed against the center of the annular sealing boss 621 by the spring 61 and is movably arranged between the lower side of the shunt disc 63 and the upper side of the coupler 5; the upper sealing gasket 64 is pressed against the upper side of the shunt disc 63 by the upper cover 7.

[0038] The water inlet pipe 10 of the upper cover 7 is in communication with the liquid inlet channel 52 of the coupler 5 through the liquid inlet hole three 641, the liquid inlet hole two 633, and the liquid inlet hole one 623 in sequence, and the water outlet pipe 9 of the upper cover 7 is in communication with the liquid outlet channel 51 of the coupler 5 through the metering assembly 8, the liquid outlet hole four 642, the liquid outlet hole two 632, the guide hole 635, the liquid outlet hole three 634, and the liquid outlet hole one 622 in sequence.

[0039] This design allows the pressure medium to be guided through the guide hole 635 during motor pump operation to push open the movable sealing gasket 62 supported by the spring 61, without affecting the normal pumping pressure medium of the motor pump. When the motor pump stops running, the movable sealing gasket 62 supported by the spring 61 is pressed against the outlet hole 632 of the diverter plate 63, and together with the sealing gasket 64, it blocks the connection between the outlet channel 51 on the connector 5 and the outlet pipe 9 of the upper cover 7. This prevents the liquid from flowing rapidly towards the outlet pipe when there is a large drop (vertical distance) between the liquid level at the end of the inlet pipe 10 and the end of the outlet pipe 9, or when there is a large pressure at the end of the inlet pipe 10, or the leakage problem caused by the liquid flowing out of the outlet pipe 9 of the motor pump due to gravity.

[0040] In some embodiments, reference Figure 1 As shown, one type of crank transmission mechanism 3 includes a crank 31, a shaft 32, and a connecting rod 33. The crank 31 is fixed on the power shaft of the motor 2 to achieve power connection. The connecting rod 33 is fixedly connected to the crank 31 through the shaft 32. The connecting rod 33 has a three-blade plate structure. The blades are provided with connecting holes and face the pumping mechanism 4. The blades of the connecting rod 33 are powered by the pumping mechanism 4 to provide power.

[0041] In some embodiments, reference Figure 1 As shown, one type of pumping mechanism 4 is a diaphragm pumping mechanism, including a diaphragm 41, a diaphragm support 42, a small umbrella valve 43, a valve support 44, a large umbrella valve 45, an outer sealing ring 46, and an inner sealing ring 47. The diaphragm 41 has a three-leg structure corresponding to three diaphragm chambers. The three legs of the diaphragm 41 are connected to the crank transmission mechanism 3. The diaphragm support 42 presses the diaphragm 41 and fixes it on the upper side of the base 1. The small umbrella valve 43 has three movably fixed on the valve support 44 and seals the three diaphragm chambers of the diaphragm 41. The valve support 44 is fixed on the upper side of the diaphragm support 42. An upward channel 48 is provided in the center of the valve support 44. The large umbrella valve 45 is movably disposed in the middle of the connector 5 and its lower side seals the upward channel 48 of the valve support 44. The upper side of the valve support 44 clamps the outer sealing ring 46 and abuts against the lower outer ring of the connector 5. The upper side of the valve support 44 clamps the inner sealing ring 47 and abuts against the lower inner ring of the connector 5.

[0042] Specifically, after the motor 2 is connected to the rated voltage, it starts to rotate and applies torque to the crank 31. The crank 31 rotates with the motor 2 and transmits kinetic energy to the diaphragm 41 on the connecting rod 33 through the shaft 32 installed in its inner inclined hole. The diaphragm 41 moves up and down like a piston. When each independent chamber of the diaphragm 41 moves downward, the large umbrella valve 45 closes. At this time, a negative pressure is formed in this chamber, and the corresponding small umbrella valve 43 opens. Under atmospheric pressure, the liquid is drawn into each chamber of the diaphragm 41 through the designed flow channel and the water inlet pipe 10 of the upper cover 7, thus completing the liquid intake action.

[0043] As each individual chamber of diaphragm 41 moves upward, the corresponding small umbrella valve 43 closes, at which point the chamber creates a pressure greater than atmospheric pressure and opens large umbrella valve 45, and the liquid is pumped under pressure through the central upward passage 48 of the designed valve holder 44 through the coupling 5 outlet passage 51 to the pressure medium.

[0044] In addition, it should be noted that, in the description of the present application, the terms "one embodiment", "another embodiment", "an embodiment", etc. refer to specific features, structures or characteristics described in connection with the embodiment, which are included in at least one embodiment described in the general description of the present application. The same expression appearing in several places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in connection with any embodiment, it is claimed that the implementation of such feature, structure or characteristic in connection with other embodiments also falls within the scope of the present application.

[0045] Although the present application has been described herein with reference to the various illustrative embodiments, it should be understood that various modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the present application. More specifically, various modifications and improvements to the subject combination layout and / or layout of the constituent components can be made within the scope of the present application, drawings and claims. In addition to the modifications and improvements to the constituent components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A leak-proof metering pump, comprising a base (1), a motor (2) fixed to the lower side of the base (1), a crank transmission mechanism (3) poweredly connected to the motor (2), a pumping mechanism (4) fixed to the upper side of the base (1) and poweredly connected to the crank transmission mechanism (3), and a connector (5) sealed and fixedly fitted on the upper side of the pumping mechanism (4), characterized in that: The connector (5) is sealed with a leak-proof mechanism (6) on its upper side and then sealed to the upper cover (7). The upper cover (7) has a water outlet (71) in the center. The upper side of the water outlet (71) is connected to the water outlet pipe (9) through a metering component (8). The upper side of the upper cover (7) has a water inlet (72) on its center side, which is connected to the water inlet pipe (10) on the upper side of the upper cover (7). The outer side of the water inlet (72) has a first sealing flange (73) that abuts against the outer ring of the water inlet channel of the leak-proof mechanism (6) and is directly and sealed to the water inlet channel of the leak-proof mechanism (6). The upper cover (7) has a water outlet (71) with a water outlet groove (74) on the side. The water outlet (71) and the water outlet groove (74) are connected by a plug (75). The outer side of the water outlet (71) and the bottom protrusion of the plug (75) are surrounded by a second sealing protrusion (76) to seal against the upper side of the leak-proof mechanism (6). The outer side of the water outlet groove (74) and the bottom protrusion of the plug (75) are surrounded by a third sealing protrusion (77) to seal against the outer ring of the water outlet channel of the leak-proof mechanism (6) and directly connect with the water outlet channel of the leak-proof mechanism (6).

2. The leak-proof metering pump according to claim 1, characterized in that: The metering component (8) includes a steering boss (81) located at the center of the upper side of the cover (7), and a metering mounting box (83) located outside the steering boss (81) is covered by an upper sealing ring (82). The upper outer side of the metering mounting box (83) is fixedly connected to and communicates with the water outlet pipe (9). A right-angle through hole (84) is provided in the steering boss (81) to communicate with the water outlet hole (71) of the cover (7). A rotor mounting platform (85) is provided in front of the upper outlet of the right-angle through hole (84) of the steering boss (81). A rotor (86) is rotatably provided between the rotor mounting platform (85) and the metering mounting box (83). A magnet is provided on the rotor (86). A fan blade is provided on the side of the rotor (86) in the direction of the upper outlet of the right-angle through hole (84). A Hall sensor PCB board (87) is provided on the outer side of the metering mounting box (83). The Hall sensor PCB board (87) is located on the side of the rotor (86).

3. The leak-proof metering pump according to claim 2, characterized in that: The upper outlet direction of the right-angle through hole (84) is tangent to the outermost ring of the rotor (86).

4. The leak-proof metering pump according to claim 2, characterized in that: The magnet is located at the center of the rotor (86) shaft.

5. The leak-proof metering pump according to claim 2, characterized in that: The rotor (86) is provided with tapered shafts (88) on both the top and bottom, and the rotor mounting platform and the metering mounting box are provided with tapered holes (89) corresponding to the tapered shafts (88) on their inner sides.

6. The leak-proof metering pump according to claim 5, characterized in that: The angle between the two opposing side waistlines on the side of the tapered hole (89) is 50°.

7. The leak-proof metering pump according to claim 1, characterized in that: The leak-proof mechanism (6) includes a spring (61), a movable sealing gasket (62), a diverter plate (63), and an upper sealing gasket (64). The movable sealing gasket (62) is provided with an annular sealing boss (621), a liquid outlet hole (622), and a liquid inlet hole (623). The position of the liquid outlet hole (622) is directly opposite to the position of the liquid outlet channel (51) of the connector (5), and the position of the liquid inlet hole (623) is directly opposite to the position of the liquid inlet channel (52) of the connector (5). The diversion plate (63) is provided with a sealing recess (631) facing the annular sealing boss (621). The center of the sealing recess (631) of the diversion plate (63) is provided with a second liquid outlet (632). The diversion plate (63) is provided with a second liquid inlet (633) facing the first liquid inlet (623). The diversion plate (63) is provided with a third liquid outlet (634) facing the first liquid outlet (622). The third liquid outlet (634) is connected to the annular edge of the sealing recess (631) on the other side that is close to the movable sealing gasket (62) and is provided with a guide hole (635) facing downward facing the annular sealing boss (621). The third liquid outlet (634) is connected to the liquid outlet channel (51) of the connector (5) through the first liquid outlet (622). The third liquid outlet (634) is connected to the second liquid outlet (632) through the guide hole (635). The upper sealing gasket (64) is provided with a liquid inlet three (641) facing the liquid inlet two (633), and the upper sealing gasket (64) is provided with a liquid outlet four (642) facing the liquid outlet two (632). The movable sealing gasket (62) is pressed against the center of the annular sealing boss (621) by the spring (61) and is movably disposed between the lower side of the diverter plate (63) and the upper side of the connector (5); the upper sealing gasket (64) is pressed against the upper side of the diverter plate (63) by the upper cover (7); The water inlet pipe (10) of the upper cover (7) is connected to the liquid inlet channel (52) on the connector (5) in sequence through the liquid inlet hole three (641), liquid inlet hole two (633), and liquid inlet hole one (623) which are directly opposite each other. The water outlet pipe (9) of the upper cover (7) is connected to the liquid outlet channel (51) on the connector (5) in sequence through the metering component (8), liquid outlet four (642), liquid outlet two (632), guide hole (635), liquid outlet three (634), and liquid outlet one (622).

8. The leak-proof metering pump according to claim 1, characterized in that: The crank transmission mechanism (3) includes a crank (31), a shaft (32), and a connecting rod (33). The crank (31) is fixed on the power shaft of the motor (2) to achieve power connection. The connecting rod (33) is fixedly connected to the crank (31) through the shaft (32). The connecting rod (33) has a three-bladed structure. The blades are provided with connecting holes and face the pumping mechanism (4). The blades of the connecting rod (33) are powered by the pumping mechanism (4).

9. The leak-proof metering pump according to claim 1, characterized in that: The pumping mechanism (4) is a diaphragm pumping mechanism, including a diaphragm (41), a diaphragm support (42), a small umbrella valve (43), a valve support (44), a large umbrella valve (45), an outer sealing ring (46), and an inner sealing ring (47). The diaphragm (41) has a three-legged, three-chamber structure. The three legs of the diaphragm (41) are connected to the crank transmission mechanism (3). The diaphragm support (42) presses the diaphragm (41) and fixes it to the upper side of the base (1). The small umbrella valve (43) has three movable parts fixed to the valve support (45). 44) The valve bracket (44) is fixed on the upper side of the diaphragm (42) and the three chambers of the diaphragm (41) are sealed. The valve bracket (44) has an upward channel (48) in the center. The large umbrella valve (45) is movably disposed in the middle of the connector (5) and the lower side of the valve bracket (44) is sealed to the upward channel (48) of the valve bracket (44). The upper side of the valve bracket (44) clamps the outer ring sealing ring (46) and abuts against the lower outer ring of the connector (5). The upper side of the valve bracket (44) clamps the inner ring sealing ring (47) and abuts against the lower inner ring of the connector (5).

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