A metering pump with buffering and shock absorbing function

Abstract

The present invention discloses a metering pump with a buffering and shock absorbing function, and relates to the technical field of metering pumps. The metering pump includes a pump body, a driving device, a compensation device and a float. The driving device is connected to the pump body, and the compensation device is connected to the pump body. The pump body is provided with a liquid inlet, a working chamber and a liquid outlet from bottom to top, and a float is provided in the liquid inlet and the liquid outlet, respectively. The two floats are movably connected to the liquid inlet and the liquid outlet, respectively. The driving device includes a diaphragm, and the diaphragm is placed in the working chamber. The compensation device is used to compensate for the pressure loss in the working chamber. The driving device is a power source, and the pressure is adjusted by driving the deformation of the diaphragm, and the two floats are controlled to open and close the liquid inlet and the liquid outlet, so as to pump liquid. The use of mechanical transmission is prone to mechanical wear, which affects the transmission accuracy, thereby causing pressure loss of the pumped liquid and reducing the metering accuracy. The instantaneous pumped liquid volume is detected by setting a compensation device, so as to ensure the metering accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of metering pumps, in particular to a metering pump with buffering and shock absorbing functions. Background Art

[0002] At present, metering pumps are used in many fields such as electronic equipment, chemical products, and food. Metering pumps are used to transport, measure, and regulate liquids.

[0003] There are many types of metering pumps, which generally adopt diaphragm or plunger structures. Diaphragm metering pumps adjust the pressure by changing the shape of the diaphragm to pump liquid. The manufacturing cost is low, but the accuracy cannot be guaranteed. Compared with diaphragm metering pumps, plunger metering pumps have higher metering accuracy. However, long-term pumping can easily cause friction loss between the plunger and the cylinder wall, reduce air tightness, and thus affect metering accuracy.

[0004] In addition, the metering pump is prone to vibration during use due to the mechanical drive. The float that controls the pump inlet is also prone to impact vibration during the opening and closing process, resulting in impact wear and reducing the negative pressure efficiency, thereby affecting the metering accuracy. Summary of the invention

[0005] The object of the present invention is to provide a metering pump with a buffering and shock absorbing function to solve the problems raised in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A metering pump with a buffering and shock absorbing function comprises a pump body, a driving device, a compensating device and a floating ball. The driving device is connected to the pump body, and the compensating device is connected to the pump body. The pump body is provided with a liquid inlet, a working chamber and a liquid outlet in sequence from bottom to top. Floats are respectively provided in the liquid inlet and the liquid outlet, and the two floats are movably connected to the liquid inlet and the liquid outlet respectively. The driving device comprises a diaphragm, and the diaphragm is placed in the working chamber. The compensating device is used to compensate for the pressure loss in the working chamber.

[0008] The pump body serves as the main installation basis for installing and fixing other devices. The driving device is the power source. It adjusts the pressure by driving the deformation of the diaphragm and controls the two floats to open and close the liquid inlet and outlet to pump liquid. Mechanical transmission is prone to mechanical wear and affects transmission accuracy, resulting in pressure loss of the pumped liquid and reducing metering accuracy. A compensation device is set to detect the instantaneous pumped liquid volume to ensure metering accuracy.

[0009] Furthermore, a transmission cavity is provided on the pump body, and the driving device also includes a driving motor, a transmission assembly, a shock absorbing assembly and a reciprocating rod. The driving motor and the pump body are tightly connected, the output end of the driving motor is inserted into the transmission cavity, the transmission assembly is placed in the transmission cavity, the driving motor is connected to the shock absorbing assembly through the transmission assembly, the shock absorbing assembly and the reciprocating rod are tightly connected, the reciprocating rod is connected to the diaphragm at one end away from the transmission assembly, a membrane groove is circumferentially arranged in the working cavity, and the outer circle of the diaphragm is inserted into the membrane groove.

[0010] The main driving space of the transmission chamber is connected to the working chamber on one side of the diaphragm. The driving motor outputs torque, which is converted into lateral displacement through the transmission assembly, driving the reciprocating rod to move back and forth, thereby driving the diaphragm to deform, which is convenient for continuous pumping. The shock-absorbing assembly is placed between the transmission assembly and the reciprocating rod, converting the rigid transmission into a flexible transmission, thereby reducing vibration and ensuring the service life of the pump. The diaphragm is installed and fixed by setting a membrane groove around the working chamber, and sealed to prevent leakage during the pumping process, resulting in loss of pressure and affecting the pumping accuracy. The reciprocating rod is guided by sliding through the connection between the working chamber and the transmission chamber.

[0011] Furthermore, a plurality of constraint flow channels are provided at the lower end of the liquid inlet, the constraint flow channels are arranged in a spiral, and the spiral diameter of the constraint flow channels is smaller than the diameter of the liquid inlet.

[0012] Through the constraint flow channel set at the liquid inlet, when the reciprocating rod drives the diaphragm to move toward the transmission assembly, the internal pressure of the working chamber is reduced, and the upper float moves downward under the action of gravity, and the liquid outlet is blocked. Under the action of the negative pressure inside the working chamber, the liquid enters from the constraint flow channel. The constraint flow channel is arranged in a spiral shape, so that the entering liquid enters the liquid inlet in a spiral shape, moves upward along the liquid inlet, and drives the lower float to float up. During the floating process, due to the inclination of the liquid moving upward, vertical and horizontal forces are formed, thereby avoiding the direct impact of the incoming liquid on the float, reducing the impact damage of the float in the process of moving up to the limit, and ensuring the service life.

[0013] Furthermore, the transmission assembly includes a worm, a worm wheel, a support shaft, a slider and a transmission seat. The worm is tightly connected to the output end of the driving motor, the tooth surfaces of the worm and the worm wheel are meshing, the worm wheel is sleeved on the support shaft, both ends of the support shaft are respectively rotatably connected to the transmission chamber, an eccentric block is provided on the support shaft, the axis of the eccentric block and the axis of the worm wheel do not coincide, a fixed groove is provided on the slider, the eccentric block and the fixed groove are rotatably connected, a slide groove is provided on the transmission seat, the slider and the slide groove are slidably connected, and the transmission seat is transmission-connected to the shock-absorbing assembly at one end away from the slider.

[0014] The torque output by the driving motor is transmitted to the worm wheel through the worm. During the rotation of the worm wheel along the fixed axis of the support shaft, the eccentric block in the eccentric state is driven to rotate. During the rotation of the eccentric block, the difference between the shortest distance and the longest distance from the outer circle to the axis of the support shaft is the lateral displacement length of the transmission seat. During the rotation of the eccentric block in the fixed groove of the slider, the slider is driven to slide along the slide groove. Since the front end of the transmission seat is limited by the shock absorbing assembly, the transmission seat is driven to move in the horizontal direction. The transmission seat drives the reciprocating rod to move horizontally through the shock absorbing assembly.

[0015] Furthermore, a guide groove is provided at one end of the transmission seat near the shock absorbing assembly, one end of the reciprocating rod is inserted into the guide groove, the reciprocating rod and the guide groove are slidably connected, the shock absorbing assembly includes a transmission rod and a mounting plate, a shock absorbing cavity is provided on the reciprocating rod, two ends of the transmission rod are respectively inserted into the guide groove and the shock absorbing cavity, one end of the transmission rod is tightly connected to the wall surface of the guide groove, a shock absorbing spring is sleeved on the transmission rod, one end of the shock absorbing spring abuts against the transmission rod, and the other end abuts against the mounting plate;

[0016] The mounting plate and the shock absorbing chamber are tightly connected.

[0017] The reciprocating rod is guided by the guide groove for sliding. The reciprocating rod is limited by the connection between the working chamber and the transmission chamber and can only move horizontally. The reciprocating rod also limits the rotation of the transmission seat, so that the transmission seat can only move horizontally. When the transmission seat moves horizontally, it drives the transmission rod to move. The transmission rod drives the mounting plate to move through the shock-absorbing spring, thereby driving the reciprocating rod to move. Through elastic transmission, liquid is prevented from entering the working chamber to impact the diaphragm. The generated reverse vibration is transmitted to the connection between the worm wheel and the worm. Through vibration attenuation, the service life of the components is guaranteed.

[0018] Furthermore, the driving device also includes an adjusting component, which includes an eccentric motor, an eccentric wheel and a clamping block. A clamping slot is provided on the reciprocating rod, the lower end of the clamping block is inserted into the clamping slot, the eccentric motor and the pump body are tightly connected, the output end of the eccentric motor is inserted into the transmission cavity, the output end of the eccentric motor and the eccentric wheel are tightly connected, the axis of the eccentric motor and the axis of the eccentric wheel do not overlap, and the outer circle of the eccentric wheel abuts against the clamping block.

[0019] By setting the adjustment component, the instantaneous pumping liquid volume of the metering pump is positively correlated with the deformation degree of the diaphragm, that is, the greater the deformation of the diaphragm, the greater the instantaneous pumping liquid volume. The reciprocating rod is used to drive the deformation of the diaphragm, the block is inserted into the slot, and the moving distance of the block is limited by the eccentric wheel. Since the axis of the eccentric wheel and the axis of the eccentric motor do not coincide, the horizontal distance from the axis of the eccentric motor to the vertical center line of the block is different during the rotation of the eccentric wheel driven by the eccentric motor. This distance is the metering distance, and the metering distance can be adjusted as needed to adjust the instantaneous pumping liquid volume.

[0020] Furthermore, an induction chamber is provided on one side of the working chamber, and a compensation device is placed in the induction chamber. The compensation device includes a plunger, a coil and a compensation cylinder. One side of the plunger faces the working chamber, and the plunger and the induction chamber are slidably connected. A push rod is provided on the side of the plunger away from the working chamber, and the coil is placed in the induction chamber. The coil is sleeved on the outside of the push rod, and the side of the push rod away from the plunger is in contact with the preload spring. The push rod is made of a magnet. The compensation cylinder is placed in the induction chamber, and the output end of the compensation cylinder is in contact with the preload spring.

[0021] By setting up the induction chamber, the plunger is slidably guided, with the two sides of the plunger facing the working chamber and the induction chamber respectively. When liquid is aspirated, the working chamber is in a negative pressure state. Under the action of the negative pressure, the plunger drives the push rod to move away from the preload spring. When the push rod moves along the inner circle of the coil, the coil cuts the magnetic flux lines to generate an induced current. When the diaphragm is deformed into place, the current generated on the coil is the calibration current. When the diaphragm deformation is less than the standard deformation at this measuring distance, the current generated on the coil is less than the calibration current, thereby monitoring the diaphragm deformation in real time.

[0022] As an optimization, the coil and the compensation cylinder are electrically connected. According to the current signal measured on the coil, the compensation cylinder is controlled to move the ejector rod through the preload spring, thereby driving the plunger to move inward, so that negative pressure is further generated in the working chamber, thereby automatically compensating for the pressure loss and ensuring the metering accuracy.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: the shock-absorbing component is placed between the transmission component and the reciprocating rod, converting the rigid transmission into a flexible transmission, thereby reducing vibration and ensuring the service life of the pump liquid; under the action of the negative pressure inside the working chamber, the liquid enters from the constraint flow channel, and the spiral arrangement of the constraint flow channel allows the entered liquid to enter the liquid inlet in a spiral shape, and move upward along the liquid inlet, and drive the floating ball in the lower layer to float up. During the floating process, due to the inclined upward movement of the liquid, vertical and horizontal forces are formed, thereby avoiding the direct impact of the incoming liquid on the floating ball, reducing the impact damage of the floating ball in the process of moving up to the limit, and ensuring the service life; when the transmission seat moves horizontally, it drives the transmission rod to move, and the transmission rod drives the mounting plate to move through the shock-absorbing spring, thereby driving the reciprocating rod to move, and through elastic transmission, preventing the liquid from entering the working chamber and damaging the floating ball. The diaphragm is impacted, and the reverse vibration generated is transmitted to the connection between the worm wheel and the worm, and the service life of the parts is guaranteed by vibration attenuation. When liquid is absorbed, the working chamber is in a negative pressure state. Under the action of negative pressure, the plunger drives the push rod to move away from the preload spring. When the push rod moves along the inner circle of the coil, the coil cuts the magnetic flux lines to generate an induced current. When the diaphragm is deformed into place, the current generated on the coil is the calibration current. When the diaphragm deformation is less than the standard deformation at this metering distance, the current generated on the coil is less than the calibration current, thereby monitoring the diaphragm deformation in real time. According to the current signal measured on the coil, the compensation cylinder is controlled to drive the push rod to move through the preload spring, thereby driving the plunger to move inward, so that negative pressure is further generated in the working chamber, thereby automatically compensating for the pressure loss and ensuring metering accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of pressure compensation of the present invention;

[0026] Figure 3 It is a transmission schematic diagram of the driving device of the present invention;

[0027] Figure 4 It is a schematic diagram of the liquid inlet and flow guiding structure of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the regulating component of the present invention;

[0029] Figure 6 It is a schematic diagram of the transmission assembly structure of the present invention.

[0030] In the figure: 1, pump body; 11, liquid inlet; 12, working chamber; 13, liquid outlet; 14, transmission chamber; 15, induction chamber; 16, constraint flow channel; 2, driving device; 21, driving motor; 22, transmission assembly; 221, worm; 222, worm wheel; 223, support shaft; 224, slider; 225, transmission seat; 2251, slide groove; 2252, guide groove; 226, eccentric block; 2 3. Shock-absorbing assembly; 231. Transmission rod; 232. Shock-absorbing spring; 233. Mounting plate; 24. Reciprocating rod; 241. Shock-absorbing chamber; 242. Slot; 25. Diaphragm; 26. Adjustment assembly; 261. Eccentric motor; 262. Eccentric wheel; 263. Block; 3. Compensation device; 31. Plunger; 32. Push rod; 33. Coil; 34. Preload spring; 35. Compensation cylinder; 4. Float. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example: Figure 1-Figure 6 As shown, the present invention provides a technical solution for a metering pump with buffering and shock absorbing functions.

[0033] A metering pump with a buffering and shock absorbing function, the metering pump comprises a pump body 1, a driving device 2, a compensating device 3 and a floating ball 4, the driving device 2 is connected to the pump body 1, the compensating device 3 is connected to the pump body 1, the pump body 1 is provided with a liquid inlet 11, a working chamber 12 and a liquid outlet 13 from bottom to top, the liquid inlet 11 and the liquid outlet 13 are respectively provided with floating balls 4, the two floating balls 4 are respectively movably connected to the liquid inlet 11 and the liquid outlet 13, the driving device 2 comprises a diaphragm 25, the diaphragm 25 is placed in the working chamber 12, and the compensating device 3 is used to compensate for the pressure loss in the working chamber 12.

[0034] The pump body 1 is used as the main installation base for installing and fixing other devices. The driving device 2 is the power source. It adjusts the pressure by driving the diaphragm 25 to deform and controls the two floats 4 to open and close the liquid inlet 11 and the liquid outlet 13, thereby pumping liquid. The use of mechanical transmission is prone to mechanical wear and affects the transmission accuracy, thereby causing pressure loss of the pumped liquid and reducing the metering accuracy. The instantaneous pumped liquid volume is detected by setting a compensation device 3 to ensure the metering accuracy.

[0035] Furthermore, a transmission chamber 14 is provided on the pump body 1, and the driving device 2 also includes a driving motor 21, a transmission assembly 22, a shock absorbing assembly 23 and a reciprocating rod 24. The driving motor 21 and the pump body 1 are tightly connected, and the output end of the driving motor 21 is inserted into the transmission chamber 14. The transmission assembly 22 is placed in the transmission chamber 14. The driving motor 21 is connected to the shock absorbing assembly 23 through the transmission assembly 22. The shock absorbing assembly 23 and the reciprocating rod 24 are tightly connected. The reciprocating rod 24 is connected to the diaphragm 25 at one end away from the transmission assembly 22. A membrane groove is circumferentially arranged in the working chamber 12, and the outer circle of the diaphragm 25 is inserted into the membrane groove.

[0036] The main driving space of the transmission chamber 14 is connected to the working chamber 12 on one side of the diaphragm 25. The driving motor 21 outputs torque, and the torque is converted into lateral displacement through the transmission assembly 22, driving the reciprocating rod 24 to reciprocate and move horizontally, thereby driving the diaphragm 25 to deform, which is convenient for continuous pumping. The shock-absorbing assembly 23 is placed between the transmission assembly 22 and the reciprocating rod 24, converting the rigid transmission into a flexible transmission, thereby reducing vibration and ensuring the service life of the pump. The diaphragm 25 is installed and fixed by setting a membrane groove around the working chamber 12, and is sealed to prevent leakage during the pumping process, resulting in loss of pressure and affecting the pumping accuracy. The reciprocating rod 24 is guided by sliding through the connection between the working chamber 12 and the transmission chamber 14.

[0037] Furthermore, a plurality of constrained flow channels 16 are provided at the lower end of the liquid inlet 11 . The constrained flow channels 16 are arranged in a spiral shape, and the spiral diameter of the constrained flow channels 16 is smaller than the diameter of the liquid inlet 11 .

[0038] Through the constraint flow channel 16 set at the liquid inlet 11, when the reciprocating rod 24 drives the diaphragm 25 to move toward the transmission assembly 22, the internal pressure of the working chamber 12 is reduced, and the upper float 4 moves downward under the action of gravity, and blocks the liquid outlet 13. Under the action of the negative pressure inside the working chamber 12, the liquid enters from the constraint flow channel 16. The constraint flow channel 16 is spirally arranged, so that the entering liquid enters the liquid inlet 11 in a spiral shape, moves upward along the liquid inlet 11, and drives the lower float 4 to float. During the floating process, due to the upward inclination of the liquid, vertical and horizontal force components are formed, thereby avoiding the direct impact of the incoming liquid on the float 4, reducing the impact damage of the float 4 in the process of moving up to the limit, and ensuring the service life.

[0039] Furthermore, the transmission assembly 22 includes a worm 221, a worm wheel 222, a support shaft 223, a slider 224 and a transmission seat 225. The worm 221 is tightly connected to the output end of the drive motor 21, the tooth surfaces of the worm 221 and the worm wheel 222 are meshing, the worm wheel 222 is sleeved on the support shaft 223, and both ends of the support shaft 223 are respectively rotatably connected to the transmission chamber 14. An eccentric block 226 is provided on the support shaft 223, and the axis of the eccentric block 226 and the axis of the worm wheel 222 do not coincide. The slider 224 is provided with a fixed groove, and the eccentric block 226 is rotatably connected to the fixed groove. A slide groove 2251 is provided on the transmission seat 225, and the slider 224 and the slide groove 2251 are slidably connected. The transmission seat 225 is transmission-connected to the shock-absorbing assembly 23 at one end away from the slider 224.

[0040] The torque output by the driving motor 21 is transmitted to the worm wheel 222 through the worm 221. During the fixed-axis rotation of the worm wheel 222 along the support shaft 223, the eccentric block 226 in the eccentric state is driven to rotate. During the rotation of the eccentric block 226, the difference between the shortest distance and the longest distance from the outer circle to the axis of the support shaft 223 is the lateral displacement length of the transmission seat 225. During the rotation of the eccentric block 226 in the fixed groove of the slider 224, the slider 224 is driven to slide along the slide groove 2251. Since the front end of the transmission seat 225 is limited by the shock absorbing assembly 23, the transmission seat 225 is driven to move in the horizontal direction. The transmission seat 225 drives the reciprocating rod 24 to move horizontally through the shock absorbing assembly 23.

[0041] Further, a guide groove 2252 is provided at one end of the transmission seat 225 near the shock absorbing assembly 23, one end of the reciprocating rod 24 is inserted into the guide groove 2252, the reciprocating rod 24 and the guide groove 2252 are slidably connected, the shock absorbing assembly 23 includes a transmission rod 231 and a mounting plate 233, a shock absorbing cavity 241 is provided on the reciprocating rod 24, two ends of the transmission rod 231 are respectively inserted into the guide groove 2252 and the shock absorbing cavity 241, one end of the transmission rod 231 is tightly connected to the wall surface of the guide groove 2252, a shock absorbing spring 232 is sleeved on the transmission rod 231, one end of the shock absorbing spring 232 abuts against the transmission rod 231, and the other end abuts against the mounting plate 233;

[0042] The mounting plate 233 and the shock absorbing chamber 241 are tightly connected.

[0043] The reciprocating rod 24 is slidably guided by the guide groove 2252. The reciprocating rod 24 is limited by the connection between the working chamber 12 and the transmission chamber 14 and can only move horizontally. The reciprocating rod 24 also rotationally limits the transmission seat 225, so that the transmission seat 225 can only move horizontally. When the transmission seat 225 moves horizontally, it drives the transmission rod 231 to move. The transmission rod 231 drives the mounting plate 233 to move through the shock-absorbing spring 232, thereby driving the reciprocating rod 24 to move. Through elastic transmission, liquid is prevented from entering the working chamber 12 to impact the diaphragm 25. The generated reverse vibration is transmitted to the connection between the worm wheel 222 and the worm 221. Through vibration attenuation, the service life of the components is guaranteed.

[0044] Furthermore, the driving device 2 also includes an adjusting component 26, which includes an eccentric motor 261, an eccentric wheel 262 and a block 263. A slot 242 is provided on the reciprocating rod 24, and the lower end of the block 263 is inserted into the slot 242. The eccentric motor 261 and the pump body 1 are tightly connected, and the output end of the eccentric motor 261 is inserted into the transmission chamber 14. The output end of the eccentric motor 261 and the eccentric wheel 262 are tightly connected. The axis of the eccentric motor 261 and the axis of the eccentric wheel 262 do not coincide, and the outer circle of the eccentric wheel 262 abuts against the block 263.

[0045] By setting the adjustment component 26, the instantaneous pump liquid volume of the metering pump is positively correlated with the deformation degree of the diaphragm 25, that is, the greater the deformation of the diaphragm 25, the greater the instantaneous pump liquid volume. The reciprocating rod 24 is used to drive the deformation of the diaphragm 25, the block 263 is inserted into the slot 242, and the moving distance of the block 263 is limited by the eccentric wheel 262. Since the axis of the eccentric wheel 262 and the axis of the eccentric motor 261 do not coincide, the horizontal distance from the axis of the eccentric motor 261 to the vertical center line of the block 263 is different during the rotation of the eccentric wheel 262 driven by the eccentric motor 261. This distance is the metering distance, and the metering distance can be adjusted as needed to adjust the instantaneous pump liquid volume.

[0046] Furthermore, an induction chamber 15 is provided on one side of the working chamber 12, and the compensation device 3 is placed in the induction chamber 15. The compensation device 3 includes a plunger 31, a coil 33 and a compensation cylinder 35. One side of the plunger 31 faces the working chamber 12, and the plunger 31 and the induction chamber 15 are slidably connected. A push rod 32 is provided on the side of the plunger 31 away from the working chamber 12, and the coil 33 is placed in the induction chamber 15. The coil 33 is sleeved on the outside of the push rod 32. The side of the push rod 32 away from the plunger 31 abuts against the preload spring 34. The push rod 32 is made of magnet material. The compensation cylinder 35 is placed in the induction chamber 15, and the output end of the compensation cylinder 35 abuts against the preload spring 34.

[0047] By setting the induction chamber 15, the plunger 31 is slidably guided, and the two sides of the plunger 31 are respectively facing the working chamber 12 and the induction chamber 15. When liquid is aspirated, the working chamber 12 is in a negative pressure state. Under the action of the negative pressure, the plunger 31 drives the push rod 32 to move away from the preload spring 34. When the push rod 32 moves along the inner circle of the coil 33, the coil 33 cuts the magnetic flux lines to generate an induced current. When the diaphragm 25 is deformed into place, the current generated on the coil 33 is the calibration current. When the deformation of the diaphragm 25 is less than the standard deformation at this measuring distance, the current generated on the coil 33 is less than the calibration current, thereby real-time monitoring of the deformation of the diaphragm 25 is performed.

[0048] As an optimization, the coil 33 is electrically connected to the compensation cylinder 35. According to the current signal measured on the coil 33, the compensation cylinder 35 is controlled to drive the push rod 32 to move through the preload spring 34, thereby driving the plunger 31 to move inward, so that negative pressure is further generated in the working chamber 12, thereby automatically compensating for the pressure loss and ensuring the metering accuracy.

[0049] Working principle of the present invention: the shock absorbing assembly 23 is placed between the transmission assembly 22 and the reciprocating rod 24, converting the rigid transmission into a flexible transmission, thereby reducing vibration and ensuring the service life of the pump liquid; under the negative pressure inside the working chamber 12, the liquid enters from the constraint flow channel 16, and the spiral arrangement of the constraint flow channel 16 makes the entered liquid enter the liquid inlet 11 in a spiral shape, and move up along the liquid inlet 11, and drive the float 4 of the lower layer to float up. During the floating process, due to the inclined upward movement of the liquid, vertical and horizontal components of force are formed, thereby avoiding the direct impact of the incoming liquid on the float 4, reducing the impact damage of the float 4 in the process of moving up to the limit, and ensuring the service life; when the transmission seat 225 moves horizontally, it drives the transmission rod 231 to move, and the transmission rod 231 drives the mounting plate 233 to move through the shock absorbing spring 232, thereby driving the reciprocating rod 24 to move, and through elastic transmission, preventing the liquid from entering the working chamber 12 to impact the diaphragm 25 , the reverse vibration generated is transmitted to the connection between the worm wheel 222 and the worm 221, and the service life of the parts is guaranteed by vibration attenuation; when the liquid is sucked, the working chamber 12 is in a negative pressure state, and the plunger 31 drives the push rod 32 to move away from the preload spring 34 under the action of the negative pressure. When the push rod 32 moves along the inner circle of the coil 33, the coil 33 cuts the magnetic flux lines to generate an induced current. When the diaphragm 25 is deformed into place, the current generated on the coil 33 is the calibration current. When the deformation of the diaphragm 25 is less than the standard deformation under this metering distance, the current generated on the coil 33 is less than the calibration current, thereby monitoring the deformation of the diaphragm 25 in real time; according to the current signal measured on the coil 33, the compensation cylinder 35 is controlled to drive the push rod 32 to move through the preload spring 34, thereby driving the plunger 31 to move inward, so that negative pressure is further generated in the working chamber 12, thereby automatically compensating for the pressure loss and ensuring the metering accuracy.

[0050] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A metering pump with a buffering and shock absorbing function, characterized in that: The metering pump comprises a pump body (1), a driving device (2), a compensation device (3) and a float (4), wherein the driving device (2) is connected to the pump body (1), and the compensation device (3) is connected to the pump body (1), wherein the pump body (1) is provided with a liquid inlet (11), a working chamber (12) and a liquid outlet (13) in sequence from bottom to top, wherein the liquid inlet (11) and the liquid outlet (13) are respectively provided with a float (4), and the two floats (4) are respectively movably connected to the liquid inlet (11) and the liquid outlet (13), wherein the driving device (2) comprises a diaphragm (25), and the diaphragm (25) is disposed in the working chamber (12), and the compensation device (3) is used to compensate for the pressure loss in the working chamber (12); A sensing chamber (15) is provided on one side of the working chamber (12), and the compensation device (3) is placed in the sensing chamber (15). The compensation device (3) comprises a plunger (31), a coil (33) and a compensation cylinder (35). One side of the plunger (31) faces the working chamber (12), and the plunger (31) and the sensing chamber (15) are slidably connected. A push rod (32) is provided on the side of the plunger (31) away from the working chamber (12). The coil (33) is placed in the sensing chamber (15), and the coil (33) is sleeved on the outside of the push rod (32). The side of the push rod (32) away from the plunger (31) abuts against a preload spring (34), and the push rod (32) is made of a magnet. The compensation cylinder (35) is placed in the sensing chamber (15), and an output end of the compensation cylinder (35) abuts against the preload spring (34).

2. A metering pump with a buffering and shock absorbing function according to claim 1, characterized in that: The pump body (1) is provided with a transmission chamber (14), and the driving device (2) further comprises a driving motor (21), a transmission assembly (22), a shock absorbing assembly (23) and a reciprocating rod (24). The driving motor (21) and the pump body (1) are tightly connected, and the output end of the driving motor (21) is inserted into the transmission chamber (14). The transmission assembly (22) is placed in the transmission chamber (14). The driving motor (21) is connected to the shock absorbing assembly (23) through the transmission assembly (22). The shock absorbing assembly (23) and the reciprocating rod (24) are tightly connected. The reciprocating rod (24) is connected to a diaphragm (25) at one end away from the transmission assembly (22). A diaphragm groove is circumferentially arranged in the working chamber (12), and the outer circle of the diaphragm (25) is inserted into the diaphragm groove.

3. A metering pump with a buffering and shock absorbing function according to claim 2, characterized in that: A plurality of constrained flow channels (16) are provided at the lower end of the liquid inlet (11), the constrained flow channels (16) being arranged in a spiral, and the spiral diameter of the constrained flow channels (16) being smaller than the diameter of the liquid inlet (11).

4. A metering pump with a buffering and shock absorbing function according to claim 3, characterized in that: The transmission assembly (22) comprises a worm (221), a worm wheel (222), a support shaft (223), a slider (224) and a transmission seat (225); the worm (221) is tightly connected to the output end of the drive motor (21); the tooth surfaces of the worm (221) and the worm wheel (222) are meshed; the worm wheel (222) is sleeved on the support shaft (223); both ends of the support shaft (223) are rotatably connected to the transmission chamber (14); the support shaft (223) is An eccentric block (226) is provided on the driving seat (23), the axis of the eccentric block (226) and the axis of the worm wheel (222) do not overlap, the slider (224) is provided with a fixed groove, the eccentric block (226) and the fixed groove are rotatably connected, the transmission seat (225) is provided with a slide groove (2251), the slider (224) and the slide groove (2251) are slidably connected, and the transmission seat (225) is transmission-connected to the shock-absorbing assembly (23) at one end away from the slider (224).

5. A metering pump with a buffering and shock absorbing function according to claim 4, characterized in that: The transmission seat (225) is provided with a guide groove (2252) at one end close to the shock absorbing assembly (23), one end of the reciprocating rod (24) is inserted into the guide groove (2252), the reciprocating rod (24) and the guide groove (2252) are slidably connected, the shock absorbing assembly (23) comprises a transmission rod (231) and a mounting plate (233), the reciprocating rod (24) is provided with a shock absorbing cavity (241), two ends of the transmission rod (231) are respectively inserted into the guide groove (2252) and the shock absorbing cavity (241), one end of the transmission rod (231) is tightly connected to the wall surface of the guide groove (2252), a shock absorbing spring (232) is sleeved on the transmission rod (231), one end of the shock absorbing spring (232) is in contact with the transmission rod (231), and the other end is in contact with the mounting plate (233); The mounting plate (233) and the shock absorbing cavity (241) are tightly connected.

6. A metering pump with a buffering and shock absorbing function according to claim 5, characterized in that: The driving device (2) further comprises an adjusting component (26), the adjusting component (26) comprising an eccentric motor (261), an eccentric wheel (262) and a clamping block (263); a clamping slot (242) is provided on the reciprocating rod (24); the lower end of the clamping block (263) is inserted into the clamping slot (242); the eccentric motor (261) and the pump body (1) are tightly connected; the output end of the eccentric motor (261) is inserted into the transmission cavity (14); the output end of the eccentric motor (261) and the eccentric wheel (262) are tightly connected; the axis of the eccentric motor (261) and the axis of the eccentric wheel (262) do not overlap; the outer circle of the eccentric wheel (262) and the clamping block (263) are in abutment with each other.

7. A metering pump with a buffering and shock absorbing function according to claim 1, characterized in that: The coil (33) and the compensation cylinder (35) are electrically connected.

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