Automatic metering pump with flow control function

Abstract

The invention relates to the technical field of metering equipment, in particular to an automatic metering pump with flow control, which comprises a casing, a driving motor is fixedly mounted at the upper end of the casing through bolts, an output pipe is fixedly connected to the left end of the casing, and a supporting pipe is fixedly connected to the left end of the output pipe through bolts. The end, away from the machine shell, of the supporting pipe is fixedly connected with a compression bin, a driving sleeve is fixedly installed at the inner end of the output pipe, a piston used for pumping air is slidably installed at the inner end of the driving sleeve, the inner end of the supporting pipe is sleeved with a compression ring, and the left end of the inner side of the compression ring is fixedly connected with two diaphragm pads used for pumping liquid. Through the design of the double diaphragm pads, the stress area of the outer surface of each diaphragm pad is more uniform, and local stress concentration is avoided, so that early aging of a supporting point caused by overlarge local stress is effectively prevented, the risk of rupture or failure of the diaphragm pads in the working process is further reduced, and the overall reliability and stability of equipment are improved.

Description

Technical Field

[0001] The invention relates to the technical field of metering equipment, in particular to an automatic metering pump with flow control. Background Art

[0002] A metering pump is a special positive displacement pump that can meet the needs of various stringent process flows. Its flow rate can be adjusted steplessly within the range of 0-100%. It is used to transport liquids (especially corrosive liquids). It is widely used in the quantitative and proportional addition of fluids (referred to as fluid proportional addition) in industries such as petroleum, chemical, water treatment, food, pharmaceutical, environmental protection, and medical equipment. It has become the heart and engine of the process industry.

[0003] After searching, it was found that the prior art publication number is CN 113833637 A, which discloses a high-precision automatic adjustment diaphragm metering pump, including a pump body, which is connected to one end of a transmission housing through a stroke section, and a fine-tuning section is connected to the other end of the transmission housing. A diaphragm is provided inside the pump body, and a drive assembly is provided inside the transmission housing. A first servo motor is installed on the outside of the transmission housing, and the first servo motor is driven and connected to the drive assembly. A piston rod is movably provided in a stroke chamber inside the stroke section, and a spring is sleeved on the outside of the piston rod. One end of the piston rod is connected to the diaphragm, and the other end of the piston rod is driven and connected to the drive assembly; a fine-tuning chamber is formed inside the fine-tuning chamber, and a matching piece is provided inside the fine-tuning chamber near one end of the transmission housing. A through hole is provided inside the matching piece along the length direction, and an adjusting screw is threadedly connected to the through hole. A displacement adjustment assembly is provided in the fine-tuning chamber, and one end of the adjusting screw is connected to a second servo motor located outside the stroke section through the displacement adjustment assembly, and the other end of the adjusting screw is operatively connected to the drive assembly.

[0004] Therefore, based on the above search and combined with existing technologies, during the operation of traditional diaphragm metering pumps, the diaphragm is pushed by the driving mechanism to perform reciprocating motion to achieve quantitative delivery of the medium. When the diaphragm reciprocates, due to the structural design or material properties, stress concentration may occur in specific areas, resulting in local fatigue accumulation and accelerated damage. Then, during long-term operation, the diaphragm is prone to fatigue damage due to excessive local force, which in turn affects the service life of the pump. For this reason, we propose an automatic metering pump with flow control. Summary of the Invention

[0005] The object of the present invention is to provide an automatic metering pump with flow control to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an automatic metering pump with flow control, comprising a casing, a driving motor fixedly installed on the upper end of the casing by bolts, an output pipe fixedly connected to the left end of the casing, the left end of the output pipe fixedly connected to a support tube by bolts, an end of the support tube away from the casing fixedly connected to a compression chamber, a driving sleeve fixedly installed on the inner end of the output pipe, a piston for extracting and compressing air slidably installed on the inner end of the driving sleeve, a compression ring sleeved on the inner end of the support tube, two diaphragm pads for pumping liquid fixedly connected to the inner left end of the compression ring, an attachment chamber sleeved on the outer surface of the support tube, a pressure stabilizing device provided inside the attachment chamber to prevent excessive deformation of the diaphragm pad, a movable sleeve passed through the inner end of the support tube, and a transmission device for assisting the diaphragm pad provided inside the movable sleeve.

[0007] As a further solution of the present invention, a drive disk is rotatably installed at the inner end of the casing, a pitch-adjusting rod is provided on the side of the drive disk away from the casing, and the end of the piston close to the drive disk is fixedly connected to the drive rod, and the drive rod is rotatably connected to the pitch-adjusting rod.

[0008] As a further solution of the present invention, the pressure stabilizing device includes a movable cylinder, which is inserted into the interior of the attachment bin. A fine-tuning knob is rotatably installed on the right end of the attachment bin. The fine-tuning knob corresponds to the movable cylinder. A sealing sleeve is fixedly welded to the left end of the fine-tuning knob. The sealing sleeve and the attachment bin are connected by a sealing bearing, and an extrusion screw is threadedly sleeved on the inner end of the sealing sleeve, and the extrusion screw and the movable cylinder are connected by a limit spring.

[0009] As a further solution of the present invention, a ventilation groove is provided on the inner side of the compression ring, and air guide holes are provided on the left and right ends of the lower side of the attachment bin and the left and right ends of the upper side of the support tube. The two air guide holes correspond to each other, and the bottom of the ventilation groove is connected to the chamber between the two diaphragm pads, and the top of the ventilation groove is connected to the ventilation groove on the left side of the support tube. The upper opening of the ventilation groove is wider than the air guide hole, so that when the compression ring moves left and right, the ventilation groove can always be connected with the air guide hole on the left side.

[0010] As a further solution of the present invention, a sealing plug is passed through the inner end of the movable cylinder, and a sealing rubber ring is provided on the outer surface of the sealing plug, which fits tightly with the inner wall of the movable cylinder to increase the sealing performance. The left end of the sealing plug is fixedly connected with a deflation rod, and the deflation rod is connected to the internal chamber of the sealing plug. The end of the deflation rod away from the sealing plug is fixedly connected with a limiting ring. The sealing plug fits tightly with the inner wall of the movable cylinder and cooperates with the sealing rubber ring to effectively prevent gas or liquid leakage and improve the sealing performance of the equipment.

[0011] As a further solution of the present invention, a limit block is fixedly installed on the inner wall of the movable cylinder, and the limit block is located on the right side of the limit ring. An air groove is provided on the outer surface of the sealing plug, and the air groove is located on the left side of the outer surface of the sealing plug, so that the gas on the left side of the movable cylinder can flow to the right side before the sealing plug is completely separated from the interior of the movable cylinder. Through the air groove design, it is ensured that the gas on the left side of the movable cylinder can flow smoothly to the right side before the sealing plug is completely separated from the movable cylinder, thereby avoiding sudden changes in air pressure or airflow blockage.

[0012] As a further solution of the present invention, the transmission device includes a limit plate, which is located on the left side of the movable sleeve and corresponds to the diaphragm pad. A center rod is fixedly installed on the right end of the limit plate, and the center rod is passed through the interior of the movable sleeve. A plurality of damping grooves are provided on the outer surface of the center rod, and damping plates are provided inside the damping grooves.

[0013] As a further solution of the present invention, the outer surface of the center rod is provided with an extrusion ring, and the extrusion ring is located on the outer surface of the damping plate. A plurality of triangular blocks are fixedly installed on the inner end of the extrusion ring, and the triangular blocks correspond to the damping plate. The right end of the extrusion ring is threadedly provided with a drive ring, and the right end of the drive ring is fixedly connected to an extension plate, and a transmission ring is provided on the right side of the drive ring, and the inner end of the transmission ring is clamped with the extension plate through a clamping plate.

[0014] As a further solution of the present invention, a passive ring is fixed on the outer surface of the transmission ring, and the right end of the support tube is rotatably connected to an adjustment ring, and the adjustment ring and the support tube are fixedly connected by a connecting plate. The adjustment ring and the support tube are fixedly connected by the connecting plate, which enhances the stability and rigidity of the overall structure and ensures that the equipment is not easily offset or loosened during operation.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. When the present invention is used, the design of the double diaphragm pad makes the outer surface stress area of ​​the diaphragm pad more uniform, avoiding local stress concentration, thereby effectively preventing the premature aging of the support point caused by excessive local stress, thereby reducing the risk of rupture or failure of the diaphragm pad during operation, and improving the overall reliability and stability of the equipment;

[0017] 2. When the present invention is used, the blocking effect of the limit plate and the cooperation of the adjustment ring and the fine-tuning knob can effectively adjust the deformation state between the two diaphragm pads, thereby controlling the moving speed of the movable cylinder and the deformation amplitude of the diaphragm pads, thereby realizing the precise extraction of small flow liquids. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of an automatic metering pump with flow control;

[0019] Figure 2 This is a disassembled diagram of an automatic metering pump with flow control;

[0020] Figure 3 This is a disassembly diagram of the interior of the casing;

[0021] Figure 4 This is a disassembled diagram of the interior of the support tube;

[0022] Figure 5 It is a schematic diagram of the structure inside the support tube and the attachment chamber;

[0023] Figure 6 Schematic diagram of the structure inside the movable cylinder;

[0024] Figure 7 It is a schematic diagram of the enlarged structure inside the support tube;

[0025] Figure 8 This is a disassembled diagram of the interior of the support tube;

[0026] Figure 9 The figure shows the morphological changes of the two diaphragm pads.

[0027] In the figure: 1, housing; 2, drive motor; 3, output pipe; 4, attachment chamber; 5, one-way valve; 6, compression chamber;

[0028] 101. Adjusting knob; 102. Adjusting screw; 103. Extrusion block; 104. Drive worm; 105. Drive shaft; 106. Drive plate; 107. Drive sleeve; 108. Piston; 109. Drive rod; 110. Pitch adjustment rod; 111. Push rod; 112. Driven gear; 113. Driven worm gear; 114. Drive gear;

[0029] 201, support tube; 202, adjustment ring; 203, passive ring; 204, support ring; 205, limit plate; 206, movable sleeve; 207, limit plate; 208, connecting plate;

[0030] 301, compression ring; 302, diaphragm pad; 303, fine-tuning knob; 304, sealing sleeve; 305, extrusion screw; 306, limit spring; 307, movable cylinder; 308, vent groove; 309, air guide hole; 310, limit ring; 311, air release rod; 312, sealing plug; 313, return spring; 314, sealing cover; 315, sealing ball;

[0031] 401. Center rod; 402. Damping groove; 403. Damping plate; 404. Extrusion ring; 405. Drive ring; 406. Extension plate; 407. Transmission ring; 408. Triangular block. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0033] Example 1: Please refer to Figure 1 - Figure 3 , an automatic metering pump with flow control, including a casing 1, a driving motor 2 is fixedly installed on the upper end of the casing 1 by bolts, an output pipe 3 is fixedly connected to the left end of the casing 1, the left end of the output pipe 3 is fixedly connected to the support pipe 201 by bolts, and the output pipe 3 and the support pipe 201 are connected by a sealing rubber ring to increase air tightness, the end of the support pipe 201 away from the casing 1 is fixedly connected to the compression chamber 6, and the upper and lower ends of the compression chamber 6 are fixedly connected to a one-way valve 5, wherein the water flows into the compression chamber 6 from the one-way valve 5 below and cannot flow out in the opposite direction, and then the water flows from the compression chamber 6 The air is discharged through the one-way valve 5 on the other side and cannot flow back into the compression chamber 6. A driving sleeve 107 is fixedly installed on the inner end of the output pipe 3. A piston 108 for extracting and compressing air is slidably installed on the inner end of the driving sleeve 107. The outer surface of the piston 108 and the inner wall of the driving sleeve 107 are smooth, and the two fit tightly, thereby achieving the sealing requirement. A driving disk 106 is rotatably installed on the inner end of the casing 1. A pitch-adjusting rod 110 is provided on the side of the driving disk 106 away from the casing 1. A driving rod 109 is fixedly connected to the end of the piston 108 close to the driving disk 106, and the driving rod 109 is rotatably connected to the pitch-adjusting rod 110.

[0034] Specifically, an adjusting knob 101 is rotatably mounted on the outer surface of the housing 1, an adjusting screw 102 is passed through the inner end of the housing 1, and the adjusting knob 101 is threadedly sleeved on the outer surface of the adjusting screw 102, and an end of the adjusting screw 102 away from the adjusting knob 101 is fixedly connected to an extrusion block 103, and a rectangular groove is formed on the outer surface of the extrusion block 103. A rectangular block is fixedly mounted on the inner end of the housing 1, and the rectangular block is passed through the rectangular groove, so that when the adjusting knob 101 is rotated, the extrusion block 103 can be driven to move forward and backward through the adjusting screw 102;

[0035] like Figure 2 、 Figure 4As shown, a sliding groove is provided on the outer surface of the driving disk 106, and the end of the pitch-adjusting rod 110 away from the driving rod 109 is inserted into the sliding groove. When the driving disk 106 rotates, the driving rod 109 is driven to reciprocate through the pitch-adjusting rod 110. The end of the pitch-adjusting rod 110 away from the driving rod 109 is connected to the extrusion block 103 through the pushing rod 111. Specifically, the left and right ends of the pushing rod 111 are respectively connected to the pitch-adjusting rod 110 and the extrusion block 103 through a universal shaft. By adjusting the distance between the pitch-adjusting rod 110 and the center of the driving disk 106, the amplitude of the reciprocating motion of the driving rod 109 is increased, and the pushing rod 111 is always in an inclined state to prevent the extrusion block 103 from being unable to move normally.

[0036] The output end of the drive motor 2 is fixedly connected to the drive shaft 105, and the bottom end of the drive shaft 105 is fixedly welded with a drive worm 104. The inner end of the casing 1 is rotatably connected to the drive gear 114. The end of the drive disk 106 away from the extrusion block 103 is fixedly connected to the passive gear 112, and the drive gear 114 is meshed with the passive gear 112. The right end of the drive gear 114 is fixedly welded with a passive worm gear 113, and the drive worm 104 is meshed with the passive worm gear 113.

[0037] like Figure 4 As shown, the inner end of the support tube 201 is sleeved with a compression ring 301, and the inner left end of the compression ring 301 is fixedly connected with two diaphragm pads 302 for sucking liquid. The diaphragm pads 302 are made of silicone rubber and have excellent corrosion resistance and folding resistance. The outer surface of the support tube 201 is sleeved with an attachment chamber 4, and a pressure stabilizing device is provided inside the attachment chamber 4 to prevent excessive deformation of the diaphragm pad 302. The inner end of the support tube 201 is penetrated by a movable sleeve 206, and the interior of the movable sleeve 206 is provided with a transmission device for assisting the diaphragm pad 302.

[0038] Example 2: Please refer to Figure 4 、 Figure 5 、 Figure 6, an automatic metering pump with flow control, based on embodiment 1, the pressure stabilizing device includes a movable cylinder 307, the movable cylinder 307 is arranged inside the attachment bin 4, the outer surface of the movable cylinder 307 is smooth, and the inner wall of the attachment bin 4 is also smooth, and the two are tightly fitted, thereby achieving the sealing requirement and avoiding excessive friction. The right end of the attachment bin 4 is rotatably installed with a fine-tuning knob 303, the fine-tuning knob 303 corresponds to the movable cylinder 307, and the left end of the fine-tuning knob 303 is fixedly welded with a sealing sleeve 304, the sealing sleeve 304 is connected to the attachment bin 4 through a sealing bearing, and the inner end threaded sleeve of the sealing sleeve 304 is provided with Extrusion screw 305, the outer surface of the extrusion screw 305 is provided with a rectangular groove, and a rectangular block is fixedly installed on the inner wall of the attachment bin 4, and the rectangular block is inserted into the rectangular groove, so that the extrusion screw 305 can move left and right on the inner wall of the attachment bin 4 without rotating. Specifically, the rectangular block in the inner wall of the attachment bin 4 is located on the right side of the inner wall of the attachment bin 4, which is only the combined length of the extrusion screw 305 and the sealing sleeve 304, and will not affect the normal left and right movement of the movable cylinder 307, and the extrusion screw 305 and the movable cylinder 307 are connected by a limit spring 306, and the inner wall of the attachment bin 4 is fixedly welded with a limit block, and the limit block is located on the left side of the movable cylinder 307.

[0039] A vent groove 308 is provided on the inner side of the compression ring 301, and air guide holes 309 are provided on the left and right ends of the lower side of the attachment chamber 4 and the left and right ends of the upper side of the support tube 201. The two air guide holes 309 correspond to each other. The lower side of the vent groove 308 is connected to the chamber between the two diaphragm pads 302, and the upper side of the vent groove 308 is connected to the vent groove 308 on the left side of the support tube 201. The outer wall of the compression ring 301 and the inner wall of the support tube 201 are both smooth, and the two fit tightly with each other to achieve the sealing requirement. Specifically, the vent groove 308 is The upper opening is wider than the air guide hole 309, so that when the compression ring 301 moves left and right, the vent groove 308 can always be connected to the left air guide hole 309, while the air guide hole 309 located on the right side of the support tube 201 is connected to the inner cavity of the support tube 201. Specifically, the air guide hole 309 located on the right side of the attachment chamber 4 is located on the left side of the rectangular block and passes over the air guide hole 309, preventing the movable cylinder 307 from completely blocking the air guide hole 309. Therefore, the movable cylinder 307 can only move freely in the chamber between the rectangular block and the limit block inside the attachment chamber 4;

[0040] When the cam 312 is in the closed position, the cam 312 is in the closed position, and the cam 312 is in the open position, so that the cam 312 is in the open position, and the cam 312 is in the open position, so that the cam 312 is in the open position, and the cam 312 is in the open position, so that the cam 312 is in the open position, and the cam 312 is in the open position, so that the cam 312 is in the open position, and the cam 312 is in the open position, so that the cam 312 is in the open position, and the cam 312 is in the open position,

[0041] More specifically, a sealing cover 314 is fixedly installed on the right side of the inner end of the sealing plug 312, and a sealing ball 315 is provided between the sealing cover 314 and the sealing plug 312. A vent hole is provided on the outer surface of the sealing cover 314, and the sealing ball 315 blocks the vent hole. The sealing ball 315 and the sealing plug 312 are connected by a return spring 313, so that the sealing ball 315 can always keep the vent hole blocked.

[0042] See also Figure 4 、 Figure 7 、 Figure 8 , Figure 9 The transmission device includes a limit plate 205, which is located on the left side of the movable sleeve 206. The limit plate 205 corresponds to the diaphragm pad 302. The left side of the limit plate 205 is concave, so that when the diaphragm pad 302 is deformed by force, it can better fit closely with the outer surface of the limit plate 205. At the same time, the limit plate 205 prevents the diaphragm pad 302 from being deformed by force due to different amplitudes, thereby affecting the pumping efficiency (the change effect is as follows Figure 9 The cam 404 is provided with a plurality of springs which are arranged in a ring shape, and the inner end of the movable sleeve 206 is fixed with a plurality of protrusions which are arranged in the inner part of the damping groove 402 to prevent the limit plate 205 from rotating. The inner part of the damping groove 402 is provided with a damping plate 403 which is provided with a diamond groove on the outer surface of the damping plate 403 and the inner part of the damping groove 402. When the damping plate 403 is tightly fitted in the damping groove 402, the reciprocating motion of the center rod 401 is limited by friction. The inner end of the support tube 201 is fixed with a support ring 204 which is sleeved on the outer surface of the movable sleeve 206, and the movable sleeve 206 is connected to the support ring 204 by a contact spring.

[0043] The outer surface of the center rod 401 is provided with an extrusion ring 404, which is located on the outer surface of the damping plate 403. The inner end of the extrusion ring 404 is fixedly installed with a plurality of triangular blocks 408, and the triangular blocks 408 correspond to the damping plate 403. When the extrusion ring 404 moves to the left, the damping plate 403 is pressed by the slope of the triangular blocks 408, so that the damping plate 403 is more closely fitted with the inner wall of the damping groove 402. Since the triangular blocks 408 are closely fitted with the outer surface of the damping plate 403, the triangular blocks 408 are also located in the damping groove 402. 02, so that the extrusion ring 404 can only move left and right, and cannot rotate. The right end of the extrusion ring 404 is threadedly sleeved with a drive ring 405, and the right end of the drive ring 405 is fixedly welded with an extension plate 406, and a transmission ring 407 is provided on the right side of the drive ring 405. The inner end of the transmission ring 407 is clamped with the extension plate 406 through a clamping plate. The transmission ring 407 can move left and right on the outer surface of the extension plate 406. The right end of the center rod 401 is fixedly installed with a limit plate 207, and the limit plate 207 is located on the right side of the transmission ring 407;

[0044] The outer surface of the transmission ring 407 is fixedly sleeved with a passive ring 203, and the right end of the support tube 201 is rotatably connected to the adjustment ring 202, and the adjustment ring 202 and the support tube 201 are fixedly connected by a connecting plate 208. Specifically, the right end of the support tube 201 is opened with a plurality of arc-shaped holes, and the connecting plate 208 is inserted into the arc-shaped holes. The arc-shaped holes are larger than the width of the connecting plate 208, so that the connecting plate 208 can move freely in the arc-shaped holes. Two sealing rings are fixedly welded to the right end of the support tube 201, and the connecting plate 208 is arranged between the two sealing rings. The left end of the adjustment ring 202 is sleeved with a sealing rubber ring and inserted into the gap between the two sealing rings, thereby enhancing air tightness.

[0045] More specifically, a clamping block is fixedly installed on the left end of the adjusting ring 202, and a clamping groove is opened on the inner wall of the sealing ring, so that when the adjusting ring 202 moves to the left, the clamping block is clamped in the clamping groove to prevent the adjusting ring 202 from detaching from the sealing ring during operation of the device.

[0046] The working principle of the present invention is:

[0047] During operation, the driving motor 2 drives the driving shaft 105 to rotate, causing the driving worm 104 to rotate, and then the driven worm gear 113 starts to rotate, and drives the driving disk 106 to rotate through the meshing action of the driving gear 114 and the driven gear 112. When the driving disk 106 rotates, it drives the driving rod 109 to reciprocate through the pitch-adjusting rod 110. To adjust the reciprocating amplitude of the driving rod 109, the adjusting knob 101 is turned at this time, so that the adjusting screw 102 drives the squeezing block 103 to move, so that the squeezing block 103 squeezes the push rod 111, allowing it to drive the pitch-adjusting rod 110 to move in the sliding groove on the outer surface of the driving disk 106, so that the reciprocating distance of the driving rod 109 becomes larger;

[0048] When the driving rod 109 reciprocates, it drives the piston 108 to move. Under the action of air pressure, the compression ring 301 is driven to move through the diaphragm pad 302, and the liquid is pumped into the interior of the compression chamber 6. Since there is a certain gap between the two diaphragm pads 302, there is air between them. In order to avoid the deformation amplitude of the right diaphragm pad 302 being greater than that of the right diaphragm pad 302 (such as Figure 9 At the same time, the movable cylinder 307 also moves with the movement of the piston 108, compressing the limit spring 306. During the movement toward the right, the air between the two diaphragm pads 302 is extracted. At this time, when the piston 108 moves to the rightmost position inside the drive sleeve 107, the movable cylinder 307 contacts the rectangular block at the inner right end of the attachment chamber 4 and stops moving. At this time, the sealing plug 312 will continue to move until the air groove on the outer surface of the sealing plug 312 is exposed outside the movable cylinder 307. At this time, the air pressure on the left and right sides of the movable cylinder 307 is the same.

[0049] If it is necessary to prevent the diaphragm pad 302 from returning to its initial state prematurely, the fine-tuning knob 303 is turned to drive the extrusion screw 305 to move through the sealing sleeve 304, compressing the limit spring 306, thereby increasing the resistance to the movement of the movable cylinder 307 (the air pressure is greater than the elastic force of the limit spring 306), thereby effectively delaying the diaphragm pad 302 from returning to its initial state prematurely.

[0050] When the piston 108 subsequently returns, the sealing plug 312 is squeezed by the limit spring 306, and air cannot circulate. At this time, the sealing ball 315 is pushed by the air to squeeze the return spring 313. Then, under the action of the air pressure squeezing the sealing ball 315, the air pressure on the left and right sides of the movable cylinder 307 is kept balanced. Subsequently, the movable cylinder 307 is returned to the inner center of the attachment chamber 4 under the elastic force of the return spring 313, so as to prevent the movable cylinder 307 from pressing the air back during the resetting process, causing the two diaphragm pads 302 to expand to the left and right sides.

[0051] When the diaphragm pad 302 located at the right end of the inner side of the compression ring 301 moves to the right, it contacts the outer surface of the limit plate 205 and drives the limit plate 205 to move to the left. Subsequently, the limit plate 205 drives the movable sleeve 206 to move. As the piston 108 returns, the movable sleeve 206 returns to its initial state under the elastic force of the resistance spring.

[0052] Since there is air between the two diaphragm pads 302, when the piston 108 reciprocates, the two diaphragm pads 302 are deformed in different states under the action of negative pressure (such as Figure 9 As shown), the volume of liquid extracted each time may not flow out according to the predetermined setting. At this time, the limit plate 205 can effectively prevent this situation from happening. At the same time, this situation can also be used to finely adjust the amount of water pumped each time. It is only necessary to unplug the connection between the adjustment ring 202 and the support tube 201, and then rotate the adjustment ring 202. The transmission ring 407 is driven to rotate by the passive ring 203, and the transmission ring 407 drives the drive ring 405 to rotate, so that the extrusion ring 404 moves to the right, and the center rod 401 can also move left and right. Then, the fine-tuning knob 303 is turned to compress the limit spring 306, so that the movement of the movable cylinder 307 slows down. At this time, the speed at which the air between the two diaphragm pads 302 is extracted is slowed down. At the same time, the inner cavity of the attachment chamber 4 is smaller, so the volume of air extracted is smaller. The diaphragm pads 302 can directly receive the air pressure generated by the movement of the piston 108. At this time, the deformation states of the two diaphragm pads 302 are different, and the amplitude of the left side is smaller than that of the right side, so as to achieve the extraction of a smaller amount of liquid.

[0053] At the same time, the design of the double diaphragm pad 302 has a certain gap between the two, so that the force-bearing area of ​​the outer surface is more uniform, avoiding local force causing premature aging of the support point and shortening the service life.

[0054] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An automatic metering pump with flow control, comprising a housing, characterized in that: A driving motor is fixedly installed on the upper end of the casing, and an output pipe is fixedly connected to the left end of the casing. The left end of the output pipe is fixedly connected to a support pipe by a bolt, and the end of the support pipe away from the casing is fixedly connected to a compression chamber. A driving sleeve is fixedly installed on the inner end of the output pipe, and a piston for extracting and compressing air is slidably installed on the inner end of the driving sleeve. The inner end of the support pipe is sleeved with a compression ring, and two diaphragm pads for sucking liquid are fixedly connected to the inner left end of the compression ring. The outer surface of the support pipe is sleeved with an attachment chamber, and a pressure stabilizing device is provided inside the attachment chamber to prevent excessive deformation of the diaphragm pad. A movable sleeve is passed through the inner end of the support pipe, and a transmission device for assisting the diaphragm pad is provided inside the movable sleeve.

2. An automatic metering pump with flow control according to claim 1, characterized in that: A driving disc is rotatably mounted on the inner end of the casing, a pitch-adjusting rod is provided on the side of the driving disc away from the casing, and the driving rod is fixedly connected to the end of the piston close to the driving disc, and the driving rod is rotatably connected to the pitch-adjusting rod.

3. The automatic metering pump with flow control according to claim 1, characterized in that: The pressure stabilizing device includes a movable cylinder, which is inserted into the interior of the attachment bin. A fine-tuning knob is rotatably installed on the right end of the attachment bin. The fine-tuning knob corresponds to the movable cylinder. The left end of the fine-tuning knob is fixedly connected to a sealing sleeve, and the inner end of the sealing sleeve is threadedly sleeved with an extrusion screw, and the extrusion screw and the movable cylinder are connected by a limit spring.

4. The automatic metering pump with flow control according to claim 3, characterized in that: A ventilation groove is provided on the inner side of the compression ring, and air guide holes are provided on the left and right ends of the lower side of the attachment bin and the left and right ends of the upper side of the support tube. The two air guide holes correspond to each other. The bottom of the ventilation groove is connected to the chamber between the two diaphragm pads, and the top of the ventilation groove is connected to the ventilation groove on the left side of the support tube. The upper opening of the ventilation groove is wider than the air guide hole, so that when the compression ring moves left and right, the ventilation groove can always be connected with the air guide hole on the left.

5. The automatic metering pump with flow control according to claim 4, characterized in that: A sealing plug is provided at the inner end of the movable cylinder, and a sealing rubber ring is provided on the outer surface of the sealing plug, which fits tightly with the inner wall of the movable cylinder to increase the sealing performance. A deflation rod is fixedly connected to the left end of the sealing plug, and the deflation rod is communicated with the internal chamber of the sealing plug. The end of the deflation rod away from the sealing plug is fixedly connected to a limiting ring.

6. The automatic metering pump with flow control according to claim 5, characterized in that: A limit block is fixedly installed on the inner wall of the movable cylinder, and the limit block is located on the right side of the limit ring. An air groove is opened on the outer surface of the sealing plug, and the air groove is located on the left side of the outer surface of the sealing plug, so that the gas on the left side of the movable cylinder can flow to the right side before the sealing plug is completely separated from the interior of the movable cylinder.

7. The automatic metering pump with flow control according to claim 1, characterized in that: The transmission device includes a limit plate, which is located on the left side of the movable sleeve and corresponds to the diaphragm pad. A center rod is fixedly installed on the right end of the limit plate, and the center rod is passed through the interior of the movable sleeve. A plurality of damping grooves are provided on the outer surface of the center rod, and damping plates are provided inside the damping grooves.

8. The automatic metering pump with flow control according to claim 7, characterized in that: The outer surface of the center rod is sleeved with an extrusion ring, which is located on the outer surface of the damping plate. A plurality of triangular blocks are fixedly installed on the inner end of the extrusion ring, and the triangular blocks correspond to the damping plate. A driving ring is threadedly sleeved on the right end of the extrusion ring, and the right end of the driving ring is fixedly connected to an extension plate, and a transmission ring is provided on the right side of the driving ring, and the inner end of the transmission ring is clamped with the extension plate through a clamping plate.

9. The automatic metering pump with flow control according to claim 8, characterized in that: The outer surface of the transmission ring is fixedly sleeved with a passive ring, the right end of the support tube is rotatably connected with an adjustment ring, and the adjustment ring and the support tube are fixedly connected via a connecting plate.

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