Hydraulic diaphragm metering pump

Abstract

The invention discloses a hydraulic diaphragm metering pump, and relates to the field of metering pumps, the hydraulic diaphragm metering pump comprises a transmission box body, a driving motor is mounted on the transmission box body, a plunger is mounted in the transmission box body, a diaphragm is fixed at one end of the plunger, a liquid inlet pipe is fixed on the transmission box body, and a liquid outlet pipe is fixed on the transmission box body; an impurity filtering mechanism is arranged in the liquid inlet pipe, and an impurity scraping mechanism is arranged in the liquid inlet pipe. The impurity filtering mechanism intercepts and filters impurities possibly existing in the liquid, when the liquid penetrates through the liquid inlet pipe, the impurity filtering mechanism drives the impurity scraping mechanism to move back and forth, and meanwhile, under the impact of liquid flowing, the impurity scraping mechanism rotates in the liquid inlet pipe, so that the probability that the impurity scraping mechanism scrapes the impurities when the liquid is conveyed can be reduced. The possibility that the liquid is mixed with impurities is reduced, the possibility that the diaphragm is damaged after the diaphragm is in contact with the impurities is reduced, and meanwhile the possibility that the impurities block the liquid inlet pipe after long-time use is reduced.

Description

Technical Field

[0001] The present application relates to the field of metering pumps, and in particular to a hydraulic diaphragm metering pump. Background Art

[0002] The hydraulic diaphragm metering pump is a specially designed pump that uses the movement of the diaphragm to complete the pumping work. The hydraulic diaphragm metering pump drives the worm through the motor, and the worm drives the worm wheel to reduce speed, so that the main shaft and the eccentric wheel rotate. The eccentric wheel converts the rotary motion into reciprocating motion through the connecting rod and transmits it to the plunger. The plunger pushes the oil, and the oil acts on the diaphragm, and the medium is transported through the inlet and outlet check valves.

[0003] The diaphragm of the hydraulic diaphragm metering pump is the core component of the pump. It is responsible for converting hydraulic and pneumatic forces into mechanical motion to achieve the delivery of the solution. The diaphragm metering pump uses hydraulic oil to evenly drive the diaphragm, which overcomes the disadvantage of excessive concentration of force on the pump diaphragm under mechanical direct drive, and improves the diaphragm life and working pressure limit. Rubber is the most commonly used material for diaphragms. It has good corrosion resistance, elasticity and fatigue resistance, and is suitable for a variety of media and environmental conditions, including strong acids and alkalis, high temperatures and high humidity. However, rubber materials may degrade under high temperatures and strong acids and alkalis, so their application range is subject to certain restrictions. Therefore, in addition to rubber materials, there are diaphragms made of polytetrafluoroethylene, polypropylene and other materials.

[0004] The material of the diaphragm is selected according to the properties of the liquid to be transported, but the flexible nature of the diaphragm itself will not change. During the liquid transportation process, there may be impurities in the liquid. When the impurities enter the hydraulic diaphragm metering pump, the impurities contained in the liquid may directly contact the diaphragm, causing damage or wear to the diaphragm. Summary of the invention

[0005] The purpose of the present application is to solve the problem raised in the above-mentioned background technology that during the liquid transportation process, impurities may exist in the liquid. When the impurities enter the hydraulic diaphragm metering pump, the impurities entrained in the liquid may directly contact the diaphragm, causing possible damage or wear to the diaphragm. The present application provides a hydraulic diaphragm metering pump.

[0006] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions: A hydraulic diaphragm metering pump comprises a transmission housing, a driving motor is mounted on the transmission housing, a plunger is mounted in the transmission housing, a diaphragm is fixed to one end of the plunger, a safety valve is mounted on the transmission housing, a liquid inlet pipe is fixed on the transmission housing, a liquid outlet pipe is fixed on the transmission housing, a one-way valve ball is mounted in both the liquid inlet pipe and the liquid outlet pipe, an impurity filtering mechanism is arranged in the liquid inlet pipe, and an impurity scraping mechanism is arranged in the liquid inlet pipe.

[0007] By adopting the above technical scheme, when the liquid enters the liquid inlet pipe from the external pipeline, passes through the one-way valve ball in the liquid inlet pipe, and then the liquid enters the impurity filtering mechanism, the impurity filtering mechanism intercepts and filters the impurities that may exist in the liquid, and then the liquid enters the movable cabin of the diaphragm and contacts the diaphragm, and then is pushed out of the liquid outlet pipe by the diaphragm. When the liquid passes through the liquid inlet pipe, the impurity filtering mechanism drives the impurity scraping mechanism to move back and forth, and the impurity scraping mechanism moves up and down against the inner wall of the liquid inlet pipe. At the same time, under the impact of the liquid flow, the impurity scraping mechanism rotates in the liquid inlet pipe, thereby reducing the possibility of impurities mixed in the liquid when conveying the liquid, reducing the possibility of damage to the diaphragm after contact with impurities, and reducing the possibility of impurities clogging the liquid inlet pipe due to long-term use.

[0008] Furthermore, the impurity filtering mechanism includes a filter cabin fixed on the liquid inlet pipe, the filter cabin is connected to the liquid inlet pipe, a filter plate is slidably connected in the filter cabin, a plurality of evenly distributed filter holes are opened on the filter plate, and an anti-blocking component is arranged between the filter plate and the filter cabin.

[0009] By adopting the above technical solution, when the liquid passes through the filter cabin, the liquid directly passes through the filter holes on the filter plate, allowing the filter holes on the filter plate to filter impurities that may exist in the liquid. At the same time, the anti-clogging component clears the filter holes on the filter plate, thereby filtering impurities in the liquid that is about to enter the diaphragm movable cabin, reducing the possibility of contact between the impurities entrained by the liquid and the diaphragm, causing damage to the diaphragm.

[0010] Furthermore, the anti-clogging component includes a support frame arranged in the filter cabin, a plurality of evenly distributed dredging needles are fixed on the support frame, the dredging needles correspond to the filter holes, and a reciprocating member is arranged on the filter plate.

[0011] By adopting the above technical solution, the reciprocating member is used to drive the filter plate to move back and forth in the filter chamber. When the filter plate moves back and forth, the fixed conveyor on the support frame clears the filter holes on the filter plate, thereby reducing the possibility of impurities clogging the filter plate and causing liquid to be blocked from passing through the filter holes.

[0012] Furthermore, the reciprocating member includes an interference wheel arranged on the filter plate, a reciprocating motor is fixed to one side of the filter chamber, an output end of the reciprocating motor passes through the filter chamber and is eccentrically fixedly connected to the interference wheel.

[0013] By adopting the above technical solution, the reciprocating motor drives the resistance wheel to rotate, and the resistance wheel resists the filter plate back and forth when rotating, so that the dredging needle can move back and forth in the filter hole conveniently, reducing the possibility of impurities clogging the filter hole.

[0014] Furthermore, two symmetrical return springs are arranged on the filter plate, and both ends of the return springs are fixedly connected to the filter plate and the filter chamber.

[0015] By adopting the above technical solution, the filter plate squeezes the return spring, and the return spring applies a force to the filter plate toward the resistance wheel, so that the filter plate and the resistance wheel can be easily resisted together, thereby improving the stability of the reciprocating movement of the filter plate.

[0016] Furthermore, the impurity scraping mechanism includes two scraping rods symmetrically arranged in the liquid inlet pipe, the scraping rods are in conflict with the inner wall of the liquid inlet pipe, connecting rods are fixed on the two scraping rods, and a rotating assembly is arranged between the two connecting rods and the filter plate.

[0017] By adopting the above technical solution, the filter plate drives the rotating assembly, which allows the rotating assembly to support the connecting rod, so that the scraping rod on the connecting rod contacts the inner wall of the liquid inlet pipe. When the liquid passes through the liquid inlet pipe, the liquid pushes the rotating assembly to allow the scraping rod to scrape the inner wall of the liquid inlet pipe, thereby scraping off impurities that may be attached to the inner wall of the liquid inlet pipe, reducing the possibility of long-term accumulation and agglomeration, which may cause impurities to block the filter holes on the liquid inlet pipe or the filter plate.

[0018] Furthermore, the rotating assembly includes a support rod fixed on the filter plate, the support rod is rotatably connected to a rotating rod, two connecting rods are fixedly connected to the rotating rod, and two symmetrical rotating leaves are fixed on the rotating rod.

[0019] By adopting the above technical solution, when the liquid passes through the liquid inlet pipe, the liquid pushes the rotating blades, the rotating blades drive the rotating rod, and the rotating rod rotates on the support rod. The rotating rod drives the connecting rod, and the connecting rod drives the scraper rod, so that the scraper rod can be easily rotated in the liquid inlet pipe, and at the same time the range of the scraper rod can be increased, while reducing the possibility of impurities adhering to the scraper rod.

[0020] Furthermore, an inclined baffle is arranged in the liquid inlet pipe, and the inclined baffle is trumpet-shaped and faces the filter cabin.

[0021] By adopting the above technical solution, the speed at which the liquid flows into the filter chamber is further accelerated under the action of the inclined surface of the inclined baffle, thereby reducing the possibility of impurities accumulating in the liquid inlet pipe.

[0022] In summary, the present application includes at least one of the following beneficial effects: 1. The present application directly utilizes the driving motor on the transmission box to drive the plunger to reciprocate when conveying liquid. When the plunger moves, it drives the diaphragm so that the diaphragm is squeezed and pulled back and forth. When the diaphragm is pulled, the liquid to be conveyed directly passes through the one-way valve ball in the liquid inlet pipe from the external conveying pipe into the liquid inlet pipe, and then the liquid enters the filter cabin. When the liquid passes through the filter cabin, the liquid directly passes through the filter holes on the filter plate, so that the filter holes on the filter plate filter the impurities that may exist in the liquid. At the same time, the reciprocating motor drives the resistance wheel to rotate. The output end of the reciprocating motor is eccentrically fixed to the resistance wheel, so that the resistance wheel resists the filter plate back and forth when rotating, so that the filter plate moves in the filter cabin under the action of the reset spring. The reciprocating movement in the filter allows the unblocking needle on the support frame to move back and forth in the filter hole, reducing the entry of impurities into the active area of ​​the diaphragm. At the same time, when the liquid passes through the liquid inlet pipe, the liquid pushes the rotating leaves, and the rotating leaves drive the rotating rod, allowing the rotating rod to rotate on the support rod, and the rotating rod drives the connecting rod, and the connecting rod drives the scraping rod, allowing the scraping rod to scrape the inner wall of the liquid inlet pipe. At the same time, the filter plate reciprocates and drives the support rod, and the support rod drives the rotating rod, so that the rotating rod drives the connecting rod and the scraping rod to move up and down, thereby improving the effect of the scraping rod in scraping impurities, thereby achieving the purpose of reducing the possibility of impurities mixed in the liquid when conveying the liquid, reducing the possibility of damage to the diaphragm after the diaphragm contacts with impurities, and reducing the possibility of impurities clogging the liquid inlet pipe due to long-term use.

[0023] 2. In the present application, when the resistance wheel pushes the filter plate back and forth, the filter plate squeezes the return spring, and the return spring applies a force toward the resistance wheel to the filter plate, so that the filter plate always resists against the resistance wheel during the back and forth movement, thereby achieving the purpose of making the filter plate and the resistance wheel resist each other conveniently and improving the stability of the reciprocating movement of the filter plate.

[0024] 3. In the present application, an inclined baffle is arranged at one end of the scraper rod away from the filter chamber. The inclined baffle is ring-shaped. When the liquid passes through the inclined baffle, the inclined surface of the inclined baffle further accelerates the speed at which the liquid flows into the filter chamber, thereby achieving the purpose of reducing the possibility of impurities accumulating in the liquid inlet pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a first three-dimensional structural schematic diagram of the hydraulic diaphragm metering pump in the present application; Figure 2 It is a first internal structure schematic diagram of the hydraulic diaphragm metering pump in the present application; Figure 3 It is a second internal structure schematic diagram of the hydraulic diaphragm metering pump in the present application; Figure 4 This application Figure 2 The enlarged schematic diagram at A in the middle; Figure 5 This application Figure 3 Enlarged schematic diagram of point B in the middle.

[0026] Description of reference numerals: 1. Transmission housing; 2. Diaphragm; 3. Plunger; 4. Safety valve; 5. Liquid inlet pipe; 6. Liquid outlet pipe; 7. Impurity filtering mechanism; 71. Filter cabin; 72. Filter plate; 73. Anti-clogging assembly; 731. Support frame; 732. Clearing needle; 733. Reciprocating member; 7331. Reciprocating motor; 7332. Resistance wheel; 74. Filter hole; 75. Reset spring; 8. Impurity scraping mechanism; 81. Scraping rod; 82. Connecting rod; 83. Rotating assembly; 831. Support rod; 832. Rotating rod; 833. Rotating blade; 84. Inclined baffle; 9. Driving motor. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1 —5 Further details of this application are provided.

[0028] The embodiment of the present application discloses a hydraulic diaphragm metering pump.

[0029] Reference Figure 1 , Figure 2 and Figure 3 A hydraulic diaphragm metering pump comprises a transmission box 1, a driving motor 9 is installed on the transmission box 1, a plunger 3 is installed in the transmission box 1, a diaphragm 2 is fixed at one end of the plunger 3, a safety valve 4 is installed on the transmission box 1, a liquid inlet pipe 5 is fixed on the transmission box 1, a liquid outlet pipe 6 is fixed on the transmission box 1, a one-way valve ball is installed in the liquid inlet pipe 5 and the liquid outlet pipe 6, an impurity filtering mechanism 7 is arranged in the liquid inlet pipe 5, and an impurity scraping mechanism 8 is arranged in the liquid inlet pipe 5.

[0030] When the hydraulic diaphragm 2 metering pump is needed, the metering pump is first fixed at the required position, and then the liquid inlet pipe 5 is fixedly connected to the external delivery pipeline by a flange, and then the liquid outlet pipe 6 is also fixedly connected to the external delivery pipeline by a flange, and then the chamber where the diaphragm 2 in the transmission box 1 moves is exhausted. When the liquid is transported, the driving motor 9 on the transmission box 1 is directly used to drive the plunger 3 to reciprocate, and the plunger 3 drives the diaphragm 2 when it moves, so that the diaphragm 2 is squeezed and pulled back and forth. When the diaphragm 2 is pulled, the liquid to be transported directly passes through the one-way valve ball in the liquid inlet pipe 5 from the external transport pipe, allowing the liquid to enter the compartment where the diaphragm 2 moves. Then, when the diaphragm 2 is pushed, the one-way valve ball in the liquid inlet pipe 5 blocks the liquid inlet pipe 5, allowing the liquid to push the one-way valve ball in the liquid outlet pipe 6, allowing the liquid to enter the external transport pipe from the liquid outlet pipe 6. When the liquid enters the liquid inlet pipe 5 from the external pipe, it passes through the one-way valve ball in the liquid inlet pipe 5, and then the liquid enters the impurity filtering mechanism 7, and the impurities The impurity filtering mechanism 7 intercepts and filters the impurities that may exist in the liquid, and then the liquid enters the movable cabin of the diaphragm 2 and contacts the diaphragm 2, and is then pushed out of the liquid outlet pipe 6 by the diaphragm 2. When the liquid passes through the liquid inlet pipe 5, the impurity filtering mechanism 7 drives the impurity scraping mechanism 8 to move back and forth, and the impurity scraping mechanism 8 moves up and down against the inner wall of the liquid inlet pipe 5. At the same time, under the impact of the liquid flow, the impurity scraping mechanism 8 rotates in the liquid inlet pipe 5 to scrape off the impurities that may be attached to the liquid inlet pipe 5, thereby reducing the adhesion of impurities to block the liquid inlet. Tube 5, by arranging an impurity filtering mechanism 7 on the liquid inlet pipe 5, when the liquid enters the liquid inlet pipe 5, the impurity filtering mechanism 7 filters the impurities, and then allows the liquid to contact with the diaphragm 2, and at the same time the impurity filtering mechanism 7 drives the impurity scraping mechanism 8, so that the impurity scraping mechanism 8 scrapes the inner wall of the liquid inlet pipe 5, thereby reducing the possibility of impurities mixed in the liquid when the liquid is transported, reducing the possibility of the diaphragm 2 being damaged after the diaphragm 2 contacts with impurities, and reducing the possibility of impurities clogging the liquid inlet pipe 5 after long-term use.

[0031] Reference Figure 2 , Figure 3 , Figure 4 and Figure 5 The impurity filtering mechanism 7 includes a filter cabin 71 fixed on the liquid inlet pipe 5, the filter cabin 71 is connected to the liquid inlet pipe 5, a filter plate 72 is slidably connected in the filter cabin 71, a plurality of evenly distributed filter holes 74 are opened on the filter plate 72, and an anti-blocking component 73 is arranged between the filter plate 72 and the filter cabin 71.

[0032] After the liquid enters the liquid inlet pipe 5 from the external pipeline, the one-way valve ball in the liquid inlet pipe 5 is pushed open, and then the liquid enters the filter cabin 71 along the liquid inlet pipe 5, and then enters the movable cabin of the diaphragm 2 from the filter cabin 71. When the liquid passes through the filter cabin 71, the liquid directly passes through the filter holes 74 on the filter plate 72, so that the filter holes 74 on the filter plate 72 can filter the impurities that may exist in the liquid. At the same time, the anti-clogging component 73 drives the filter plate 72 to move back and forth to clear the filter holes 74 on the filter plate 72. When the liquid passes through the liquid inlet pipe 5, it directly passes through the filter holes 74 of the filter plate 72 in the filter cabin 71, so that the filter plate 72 can block the impurities in the liquid, thereby filtering the impurities in the liquid that is about to enter the movable cabin of the diaphragm 2, reducing the possibility of the liquid entraining impurities contacting the diaphragm 2 and causing damage to the diaphragm 2.

[0033] Reference Figure 4 and Figure 5 The anti-clogging component 73 includes a support frame 731 arranged in the filter cabin 71, and a plurality of evenly distributed dredging needles 732 are fixed on the support frame 731. The dredging needles 732 correspond to the filter holes 74, and a reciprocating member 733 is arranged on the filter plate 72.

[0034] When the liquid passes through the filter holes 74 on the filter plate 72, the reciprocating member 733 is used to drive the filter plate 72 to move back and forth in the filter chamber 71. When the filter plate 72 moves back and forth, the conveying needle fixed on the support frame 731 clears the filter holes 74 on the filter plate 72. By allowing the filter plate 72 to move back and forth under the action of the reciprocating member 733, the clearing needle 732 on the support frame 731 moves back and forth in the filter holes 74, thereby reducing the possibility of impurities clogging the filter plate 72 and causing the liquid to be unable to pass through the filter holes 74.

[0035] Reference Figure 4 and Figure 5 The reciprocating member 733 includes a friction wheel 7332 arranged on the filter plate 72, and a reciprocating motor 7331 is fixed to one side of the filter chamber 71. The output end of the reciprocating motor 7331 passes through the filter chamber 71 and is eccentrically fixedly connected to the friction wheel 7332.

[0036] When the filter plate 72 needs to move back and forth, the reciprocating motor 7331 drives the resistance wheel 7332 to rotate. The output end of the reciprocating motor 7331 is eccentrically fixed to the resistance wheel 7332, so that the resistance wheel 7332 resists the filter plate 72 back and forth when rotating, and the filter plate 72 moves back and forth in the filter chamber 71, and the unclogging needle 732 moves back and forth in the filter hole 74. By allowing the eccentrically fixed resistance wheel 7332 to push the filter plate 72 back and forth, the unclogging needle 732 can be easily moved back and forth in the filter hole 74, thereby reducing the possibility of impurities clogging the filter hole 74.

[0037] Reference Figure 2 and Figure 4 Two symmetrical return springs 75 are arranged on the filter plate 72, and both ends of the return spring 75 are fixedly connected to the filter plate 72 and the filter chamber 71. When the contact wheel 7332 pushes the filter plate 72 back and forth, the filter plate 72 squeezes the return spring 75, and the return spring 75 applies a force toward the contact wheel 7332 to the filter plate 72, so that the filter plate 72 always contacts the contact wheel 7332 during the back and forth movement. By using the return spring 75 to support the filter plate 72, it is convenient to make the filter plate 72 contact with the contact wheel 7332, thereby improving the stability of the reciprocating movement of the filter plate 72.

[0038] Reference Figure 2 , Figure 3 , Figure 4 and Figure 5 The impurity scraping mechanism 8 includes two scraping rods 81 symmetrically arranged in the liquid inlet pipe 5, the scraping rods 81 are in conflict with the inner wall of the liquid inlet pipe 5, and a connecting rod 82 is fixed on the two scraping rods 81. A rotating assembly 83 is arranged between the two connecting rods 82 and the filter plate 72.

[0039] When the filter plate 72 moves back and forth, the filter plate 72 drives the rotating assembly 83, allowing the rotating assembly 83 to support the connecting rod 82, so that the scraping rod 81 on the connecting rod 82 contacts the inner wall of the liquid inlet pipe 5. When the liquid passes through the liquid inlet pipe 5, the liquid pushes the rotating assembly 83, the rotating assembly 83 drives the connecting rod 82, and the connecting rod 82 drives the scraping rod 81, so that the scraping rod 81 scrapes the inner wall of the liquid inlet pipe 5. By allowing the filter plate 72 to support the rotating assembly 83, the scraping rod 81 contacts the inner wall of the liquid inlet pipe 5, and then under the push of the liquid, the rotating assembly 83 drives the scraping rod 81 to rotate, so that impurities that may be attached to the inner wall of the liquid inlet pipe 5 can be scraped off, reducing the possibility of long-term accumulation and agglomeration, which may cause impurities to block the filter holes 74 on the liquid inlet pipe 5 or the filter plate 72.

[0040] Reference Figure 3 and Figure 5The rotating assembly 83 includes a support rod 831 fixed on the filter plate 72, a rotating rod 832 rotatably connected to the support rod 831, two connecting rods 82 are fixedly connected to the rotating rod 832, and two symmetrical rotating leaves 833 are fixed on the rotating rod 832. The filter plate 72 supports the support rod 831, and the support rod 831 supports the rotating rod 832. When the liquid passes through the liquid inlet pipe 5, the liquid pushes the rotating leaves 833, and the rotating leaves 833 drive the rotating rod 832 to rotate on the support rod 831, and the rotating rod 832 drives the connecting rod 82, and the connecting rod 82 drives the scraping rod 81, so that the scraping rod 81 scrapes the inner wall of the liquid inlet pipe 5. At the same time, the filter plate 72 reciprocates to drive the support rod 831, and the support rod 831 drives the rotating rod 832, so that the rotating rod 832 The movable rod 832 drives the connecting rod 82 and the scraper rod 81 to move up and down, thereby improving the effect of the scraper rod 81 in scraping off impurities and reducing the possibility of impurities adhering to the scraper rod 81. By allowing the liquid to push the rotating blade 833, the rotating rod 832 drives the scraper rod 81 to rotate under the support of the support rod 831, and at the same time, driven by the filter plate 72, the scraper rod 81 moves up and down, so that the scraper rod 81 can be easily rotated in the liquid inlet pipe 5, and the range of the scraper rod 81 can be increased, while reducing the possibility of impurities adhering to the scraper rod 81.

[0041] Reference Figure 2 and Figure 3 , an inclined baffle 84 is arranged in the liquid inlet pipe 5, the inclined baffle 84 is trumpet-shaped and faces the filter chamber 71. The inclined baffle 84 is arranged at one end of the scraper rod 81 away from the filter chamber 71, and the inclined baffle 84 is ring-shaped. When the liquid passes through the inclined baffle 84, the speed at which the liquid flows into the filter chamber 71 is further accelerated under the action of the inclined surface of the inclined baffle 84. By accelerating the flow rate of the liquid by the inclined baffle 84, the possibility of impurities accumulating in the liquid inlet pipe 5 can be reduced.

[0042] Working principle: When the hydraulic diaphragm 2 metering pump is needed, first fix the metering pump at the required position, then fix the liquid inlet pipe 5 with the external delivery pipeline by flange, and then fix the liquid outlet pipe 6 with the external delivery pipeline by flange. When conveying liquid, the driving motor 9 on the transmission box 1 is directly used to drive the plunger 3 to reciprocate. When the plunger 3 moves, it drives the diaphragm 2, so that the diaphragm 2 is squeezed and pulled back and forth.

[0043] When the diaphragm 2 is pulled, the liquid to be transported passes directly from the external transport pipe through the one-way valve ball in the liquid inlet pipe 5 and enters the liquid inlet pipe 5, and then the liquid enters the filter cabin 71 along the liquid inlet pipe 5, and then enters the movable cabin of the diaphragm 2 from the filter cabin 71. When the liquid passes through the filter cabin 71, the liquid directly passes through the filter holes 74 on the filter plate 72, allowing the filter holes 74 on the filter plate 72 to filter impurities that may exist in the liquid.

[0044] At the same time, the reciprocating motor 7331 drives the resistance wheel 7332 to rotate. The output end of the reciprocating motor 7331 is eccentrically fixed to the resistance wheel 7332, so that the resistance wheel 7332 resists the filter plate 72 back and forth when rotating, and the filter plate 72 moves back and forth in the filter chamber 71 under the action of the return spring 75, so that the clearing needle 732 on the support frame 731 moves back and forth in the filter hole 74, thereby reducing the entry of impurities into the active area of ​​the diaphragm 2.

[0045] At the same time, when the liquid passes through the liquid inlet pipe 5, the liquid pushes the rotating blade 833, and the rotating blade 833 drives the rotating rod 832, so that the rotating rod 832 rotates on the support rod 831, and the rotating rod 832 drives the connecting rod 82, and the connecting rod 82 drives the scraping rod 81, so that the scraping rod 81 scrapes the inner wall of the liquid inlet pipe 5. At the same time, the filter plate 72 reciprocates to drive the support rod 831, and the support rod 831 drives the rotating rod 832, so that the rotating rod 832 drives the connecting rod 82 and the scraping rod 81 to move up and down, thereby improving the effect of the scraping rod 81 in scraping impurities. After the liquid enters the active chamber of the diaphragm 2, and then when the diaphragm 2 is pushed, the one-way valve ball in the liquid inlet pipe 5 blocks the liquid inlet pipe 5, allowing the liquid to push the one-way valve ball of the liquid outlet pipe 6, allowing the liquid to enter the external conveying pipeline from the liquid outlet pipe 6.

Claims

1. A hydraulic diaphragm metering pump, comprising a transmission housing (1), characterized in that: A driving motor (9) is mounted on the transmission housing (1), a plunger (3) is mounted in the transmission housing (1), a diaphragm (2) is fixed to one end of the plunger (3), a safety valve (4) is mounted on the transmission housing (1), a liquid inlet pipe (5) is fixed to the transmission housing (1), a liquid outlet pipe (6) is fixed to the transmission housing (1), a one-way valve ball is mounted in each of the liquid inlet pipe (5) and the liquid outlet pipe (6), an impurity filtering mechanism (7) is arranged in the liquid inlet pipe (5), and an impurity scraping mechanism (8) is arranged in the liquid inlet pipe (5).

2. A hydraulic diaphragm metering pump according to claim 1, characterized in that: The impurity filtering mechanism (7) comprises a filter chamber (71) fixed on the liquid inlet pipe (5), the filter chamber (71) being in communication with the liquid inlet pipe (5), a filter plate (72) being slidably connected in the filter chamber (71), a plurality of evenly distributed filter holes (74) being formed on the filter plate (72), and an anti-clogging component (73) being provided between the filter plate (72) and the filter chamber (71).

3. A hydraulic diaphragm metering pump according to claim 2, characterized in that: The anti-clogging component (73) comprises a support frame (731) arranged in the filter chamber (71), a plurality of evenly distributed dredging needles (732) are fixed on the support frame (731), the dredging needles (732) correspond to the filter holes (74), and a reciprocating member (733) is arranged on the filter plate (72).

4. A hydraulic diaphragm metering pump according to claim 3, characterized in that: The reciprocating member (733) comprises a friction wheel (7332) arranged on the filter plate (72); a reciprocating motor (7331) is fixed to one side of the filter chamber (71); an output end of the reciprocating motor (7331) passes through the filter chamber (71) and is eccentrically fixedly connected to the friction wheel (7332).

5. A hydraulic diaphragm metering pump according to claim 4, characterized in that: Two symmetrical return springs (75) are provided on the filter plate (72), and both ends of the return spring (75) are fixedly connected to the filter plate (72) and the filter chamber (71).

6. A hydraulic diaphragm metering pump according to claim 2, characterized in that: The impurity scraping mechanism (8) comprises two scraping rods (81) symmetrically arranged in the liquid inlet pipe (5), the scraping rods (81) abutting against the inner wall of the liquid inlet pipe (5), a connecting rod (82) being fixed to the two scraping rods (81), and a rotating assembly (83) being arranged between the two connecting rods (82) and the filter plate (72).

7. A hydraulic diaphragm metering pump according to claim 6, characterized in that: The rotating assembly (83) comprises a support rod (831) fixed on the filter plate (72), a rotating rod (832) rotatably connected to the support rod (831), two connecting rods (82) fixedly connected to the rotating rod (832), and two symmetrical rotating leaves (833) fixed to the rotating rod (832).

8. A hydraulic diaphragm metering pump according to claim 6, characterized in that: An inclined baffle (84) is arranged in the liquid inlet pipe (5); the inclined baffle (84) is trumpet-shaped and faces the filter chamber (71).

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