A liquid material transport pump

Abstract

The present invention relates to the technical field of liquid pumps, and provides a pumping pump for transporting liquid materials, comprising: a pump body, which has a feed port, a diaphragm cavity and a discharge port that are interconnected, and the feed end and the discharge end of the diaphragm cavity are respectively provided with a resettable one-way valve; a diaphragm, which is arranged in the diaphragm cavity to divide the diaphragm cavity into a liquid cavity and an air cavity; a connecting rod assembly, which is arranged on the side of the diaphragm located in the air cavity, and the connecting rod assembly includes: a sliding limit rod, which is arranged in the air cavity, and the sliding limit rod can reciprocate in the axial direction; a threaded rod, which is arranged at one end of the inner cavity of the sliding limit rod; a limit ring, which is connected to the sliding limit rod, and the diaphragm is arranged between the limit ring and the sliding limit rod. The present invention arranges a rotatable lever assembly on the outside of the diaphragm, so that during normal transportation, the movement of the diaphragm causes the lever assembly to rotate slowly to clean the surface of the diaphragm.

Description

Technical Field

[0001] The invention relates to the technical field of liquid pumps, and in particular to a material extraction pump for transporting liquid materials. Background Art

[0002] In the field of liquid material transportation, diaphragm pumps are widely used in various industrial productions due to their simple structure, good sealing, and easy maintenance. Diaphragm pumps transport materials through the reciprocating motion of the diaphragm and are suitable for a variety of media, including viscous liquid materials. However, diaphragm pumps face a series of technical challenges when transporting viscous materials such as liquid materials.

[0003] First, due to the uncertainty of viscous materials such as liquid materials, their physical properties (such as viscosity, density, etc.) may vary between different batches, which makes it difficult for the diaphragm pump to maintain a constant conveying efficiency during the conveying process. During the conveying process, the viscosity of the material may cause a boundary effect in the pump body, that is, the material adheres or sticks to the inner wall of the pump body. This phenomenon is aggravated as the conveying time increases. Long-term accumulation of material adhesion will gradually increase the friction resistance inside the pump body, thereby reducing the conveying efficiency.

[0004] Secondly, the diaphragm of the diaphragm pump is a key deformable component that is subjected to high working pressure. Under high pressure, the surface of the diaphragm is prone to wear, which makes it easier for materials to adhere to the surface of the diaphragm, further aggravating the degree of wear and forming a vicious cycle. The wear of the diaphragm not only affects the service life of the pump, but may also cause material leakage, affecting production safety and the environment.

[0005] In addition, the diaphragm pump will inevitably encounter downtime during use. During downtime, some materials will remain in the pump chamber, and these materials may solidify or settle in a static state. When the pump is started again, these solidified or settled materials will increase the starting resistance, affecting the normal delivery of the pump, and may even cause the pump to fail to start. Summary of the invention

[0006] Based on this, it is necessary to provide a liquid material transport pump to address the problems existing in the current diaphragm pump when transporting viscous materials.

[0007] The above purpose is achieved through the following technical solutions:

[0008] A material extraction pump for transporting liquid materials, comprising:

[0009] A pump body, which has a feed port, a diaphragm cavity and a discharge port which are interconnected, wherein the feed end and the discharge end of the diaphragm cavity are respectively provided with a resettable one-way valve;

[0010] a diaphragm disposed in the diaphragm cavity to divide the diaphragm cavity into a liquid cavity and an air cavity;

[0011] A connecting rod assembly is arranged on one side of the diaphragm located in the air cavity, and the connecting rod assembly comprises:

[0012] A sliding limit rod, which is arranged in the air cavity and can reciprocate along the axial direction;

[0013] A threaded rod, which is arranged at one end of the inner cavity of the sliding limit rod;

[0014] A limiting ring connected to the sliding limiting rod, wherein the diaphragm is arranged between the limiting ring and the sliding limiting rod;

[0015] A cleaning rod is rotatably arranged on the limiting ring, and one end of the cleaning rod passes through the limiting ring and the inner cavity of the sliding limiting rod and is connected to the threaded rod through a spiral transmission. When the sliding limiting rod moves horizontally, the limiting ring drives the cleaning rod to move horizontally, and when the cleaning rod moves, it rotates under the action of the threaded rod;

[0016] A driving device, which is arranged near the center of the pump body and connected to the sliding limit rod, the driving device is used to drive the sliding limit rod to reciprocate in the axial direction, and is also used to inflate or exhaust the air cavity to expand or contract the diaphragm;

[0017] The lever assembly is arranged on the side of the diaphragm located in the liquid cavity and is connected to the cleaning rod. When the cleaning rod rotates, the lever assembly is driven to move to clean the side of the diaphragm located in the liquid cavity.

[0018] Furthermore, the cleaning rod includes a mounting portion and a rod portion connected to the mounting portion, the mounting portion is a shell structure with an opening, the mounting portion is sleeved on the limiting ring, the rod portion has an internal thread groove, and is connected to the open end of the mounting portion.

[0019] Furthermore, a limiting screw is installed on the mounting portion, and an annular groove is provided on the outer peripheral wall of the limiting ring. One end of the limiting screw can be inserted into the annular groove and slide along the annular groove to connect the mounting portion and the limiting ring, and enable the cleaning rod to rotate relative to the limiting ring.

[0020] Furthermore, the lever assembly includes multiple hard rods and multiple soft rods, the multiple hard rods are distributed in a circle with the axis of the cleaning rod as the center, and soft rods are respectively installed on one end of the hard rod away from the cleaning rod, and the shape of the soft rod matches the shape of the diaphragm.

[0021] Furthermore, the liquid material transport pump further comprises a diaphragm limiting plate, wherein the diaphragm limiting plate is arranged between the diaphragm and the sliding limiting rod and is used for supporting the diaphragm.

[0022] Furthermore, a friction block is provided on the threaded rod, and the liquid material transport pump also includes an electromagnetic extrusion block. When the electromagnetic extrusion block acts on the friction block, the threaded rod remains stationary, so that the cleaning rod rotates under the action of the threaded rod when it moves.

[0023] Furthermore, a buffer diaphragm connected to the inner wall of the diaphragm cavity is provided in the liquid cavity, a buffer cavity is formed between the buffer diaphragm and the cavity wall of the diaphragm cavity, a first air inlet connected to the air source is opened on the cavity wall of the diaphragm cavity, and the first air inlet is connected to the buffer cavity.

[0024] Furthermore, a sealing diaphragm is provided on the inner wall of the diaphragm cavity close to the feed end, and an airbag is provided between the sealing diaphragm and the cavity wall of the diaphragm cavity. The airbag is used to adjust the space of the channel for liquid material to enter the diaphragm cavity from the feed end. A second air inlet nozzle connected to the air source is provided on the cavity wall of the diaphragm cavity, and the second air inlet nozzle is connected to the airbag.

[0025] Furthermore, the airbags are provided in plurality and are arranged in layers along the flow direction of the liquid, each layer having two symmetrically arranged airbags, the two airbags being able to seal the channel and selectively expand or contract during use; the airbags in any layer are arranged alternately with the airbags in the adjacent layer.

[0026] Furthermore, a first cross thread is provided in the feed port, and a second cross thread is provided in the discharge port, and the first cross thread and the second cross thread are used for mixing and conveying liquid.

[0027] The beneficial effects of the present invention are:

[0028] The present invention arranges a rotatable lever assembly on the outside of the diaphragm so that during normal conveying, the movement of the diaphragm causes the lever assembly to rotate slowly to clean the surface of the diaphragm; and when the pump is shut down (i.e., the pump is working but not conveying liquid material), the lever assembly disturbs the retained material in the pump body.

[0029] The present invention arranges a buffer diaphragm on the cavity wall of the diaphragm cavity on the opposite side of the diaphragm, and arranges a buffer cavity between the buffer diaphragm and the cavity wall of the diaphragm cavity, and controls the gas in the buffer cavity to change the initial position of the buffer diaphragm, so as to solve the problem that the buffer diaphragm has no space to move due to the random position of the diaphragm when the machine is shut down (the feed pump is working but not conveying liquid material).

[0030] In addition, when the machine is shut down, the buffer diaphragm and the diaphragm move simultaneously, so that the retained material in the pump body can flow without changing the pressure in the pump body, thereby avoiding problems such as solidification due to its stillness.

[0031] Furthermore, by keeping the buffer diaphragm in an incompletely fixed state when the feed pump is working normally (the feed pump is working and conveying liquid material), the resistance of the pump body when starting can be reduced, and the pumping pressure can be buffered, thereby reducing the stress on the diaphragm and reducing the scouring force on the pump body.

[0032] The present invention sets a soft inner wall (i.e., a sealing diaphragm) on the inner wall of the feed section of the diaphragm cavity, and sets a plurality of annularly distributed airbags between the soft inner wall and the cavity wall of the diaphragm cavity, and the same layer has two airbags that independently control the air intake, and the two airbags each occupy 180 degrees. Through a set control program, by intermittently changing the pressurization and decompression of different airbags, the sealing diaphragm can be made to present a changing curvature, and cooperate with the buffer diaphragm in an incompletely fixed state to avoid the influence of the boundary effect during normal transportation and maintain the transportation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic structural diagram of a material extraction pump according to an embodiment of the present invention;

[0034] Figure 2 A front view of a material extraction pump according to an embodiment of the present invention;

[0035] Figure 3 for Figure 2 The cross-sectional view along the AA line;

[0036] Figure 4 for Figure 3 A partial enlarged view of B in FIG.

[0037] Figure 5 A top view of a material extraction pump according to an embodiment of the present invention;

[0038] Figure 6 for Figure 5 A cross-sectional view along the CC line;

[0039] Figure 7 for Figure 6 A partial enlarged view of D in FIG.

[0040] Figure 8 for Figure 6 A partial enlarged view of E in FIG.

[0041] in:

[0042] 101. feed port; 1011. first cross thread; 1012. one-way valve; 1013. compression spring; 102. discharge port; 1021. second cross thread; 103. diaphragm cavity; 104. drive device; 105. air cavity; 106. liquid cavity; 107. buffer diaphragm; 108. first air inlet; 109. cleaning rod; 1091. internal thread groove; 1092. limit screw; 1093. hard rod; 1094. soft rod; 1095. limit ring; 110. sliding limit rod; 111. friction block; 112. threaded rod; 113. electromagnetic extrusion block; 114. buffer cavity; 115. diaphragm limit plate; 116. second air inlet nozzle; 117. air bag; 118. sealing diaphragm; 119. diaphragm. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0044] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0045] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] The embodiment of the present invention provides a liquid material transport pump, such as Figure 1-Figure 3 , Figure 5 and Figure 6As shown, the liquid material transport pump includes a pump body, a diaphragm 119, a connecting rod assembly, a sliding limit rod 110, a threaded rod 112, a limit ring 1095, a cleaning rod 109, a driving device 104 and a lever assembly.

[0047] The pump body has a feed port 101, a diaphragm cavity 103 and a discharge port 102 which are interconnected. The feed end and the discharge end of the diaphragm cavity 103 are respectively provided with a resettable one-way valve 1012, wherein the diaphragm cavity 103 is a chamber inside the pump body, and the feed end and the discharge end of the diaphragm cavity 103 are respectively provided with a compression spring 1013, and the compression spring 1013 is connected to the one-way valve 1012 to reset the one-way valve 1012. After the liquid material passes through the one-way valve 1012, the spring force of the compression spring 1013 helps the one-way valve 1012 to quickly reset, ensuring that the liquid material can only flow in one direction and preventing the liquid material from flowing back.

[0048] The diaphragm 119 is disposed in the diaphragm cavity 103 to divide the diaphragm cavity 103 into a liquid cavity 106 and an air cavity 105. The diaphragm 119 is a movable membrane, usually made of an elastic material, and can expand and contract under the action of pressure changes in the air cavity 105. The expansion and contraction of the diaphragm 119 provides continuous and smooth suction and pushing actions, thereby improving the working efficiency of the pump.

[0049] The connecting rod assembly is disposed on one side of the diaphragm 119 located in the air cavity 105 , and the connecting rod assembly includes a sliding limit rod 110 , a threaded rod 112 , a limit ring 1095 and a cleaning rod 109 .

[0050] The sliding limit rod 110 is disposed in the air cavity 105, and the sliding limit rod 110 can reciprocate in the axial direction. The sliding limit rod 110 has an inner cavity penetrating both ends thereof, and the outer peripheral wall of one end of the sliding limit rod 110 close to the diaphragm 119 protrudes outward to form an annular connecting portion, and the connecting portion is connected to the limit ring 1095 by bolts.

[0051] The threaded rod 112 is disposed at one end of the inner cavity of the sliding limit rod 110, that is, the threaded rod 112 is disposed near the driving device 104. The limit ring 1095 is connected to the sliding limit rod 110, and the diaphragm 119 is disposed between the limit ring 1095 and the sliding limit rod 110. When the sliding limit rod 110 moves horizontally, the diaphragm 119 is driven to move through the limit ring 1095.

[0052] The cleaning rod 109 is rotatably arranged on the limit ring 1095, and one end of the cleaning rod 109 passes through the inner cavity of the limit ring 1095 and the sliding limit rod 110 and is connected to the threaded rod 112 through a spiral transmission. When the sliding limit rod 110 moves horizontally, it drives the cleaning rod 109 to move horizontally through the limit ring 1095, and when the cleaning rod 109 moves, it rotates under the action of the threaded rod 112. Among them, since the threaded rod 112 is in a stationary state, the cleaning rod 109 has an internal thread groove 1091, so through the spiral transmission between the cleaning rod 109 and the threaded rod 112, when the sliding limit rod 110 drives the cleaning rod 109 to move, the linear motion of the cleaning rod 109 can be converted into a rotary motion.

[0053] The driving device 104 is arranged near the center of the pump body and connected to the sliding limit rod 110. The driving device 104 is used to drive the sliding limit rod 110 to reciprocate in the axial direction and to inflate or exhaust the air cavity 105 to expand or contract the diaphragm 119.

[0054] The lever assembly is disposed on the side of the diaphragm 119 located in the liquid chamber 106 and is connected to the cleaning rod 109. When the cleaning rod 109 rotates, the lever assembly is driven to move to clean the side of the diaphragm 119 located in the liquid chamber 106. The design of the lever assembly simplifies maintenance and cleaning, and prolongs the service life of the pump.

[0055] In this embodiment, the working process of the feed pump includes:

[0056] In the liquid absorption stage, the driving device 104 controls the air cavity 105 to exhaust air, so that negative pressure is generated in the air cavity 105. The negative pressure causes the diaphragm 119 to contract, and the volume of the liquid cavity 106 increases, forming a negative pressure, which attracts liquid material from the feed port 101 into the liquid cavity 106.

[0057] During the liquid discharge stage, the driving device 104 controls the inflation of the air cavity 105 to generate positive pressure in the air cavity 105. The positive pressure pushes the diaphragm 119 to expand, the volume of the liquid cavity 106 decreases, and the liquid material is pushed from the liquid cavity 106 to the discharge port 102 through the one-way valve 1012.

[0058] When the driving device 104 controls the air chamber 105 to exhaust or inflate, the sliding limit rod 110 moves back and forth under the drive of the driving device 104. The movement of the sliding limit rod 110 drives the diaphragm 119 and the cleaning rod 109 to move horizontally through the limit ring 1095. The cleaning rod 109 converts the linear motion into rotational motion under the action of the threaded rod 112. The lever assembly moves with the rotation of the cleaning rod 109 to clean the residue attached to the diaphragm 119.

[0059] The present invention provides a rotatable lever assembly on the outside of the diaphragm 119, which can not only drive the lever assembly to rotate slowly during normal delivery through the cleaning rod 109 to clean the surface of the diaphragm 119, but also effectively prevent the wear of the diaphragm 119 caused by the liquid material attached to the surface after the wear of the diaphragm 119. In addition, the present invention can also disturb the flow of the retained material in the pump body when the pump is stopped (that is, the pump is working but not delivering liquid material), prevent material deposition, and reduce the wear of the diaphragm 119.

[0060] In one embodiment, if Figure 6 As shown, a first cross thread 1011 is provided in the feed port 101, and a second cross thread 1021 is provided in the discharge port 102. The design of the cross thread allows the liquid material to have a complex flow path when passing through the thread, increasing the turbulence of the liquid material, thereby promoting the mixing of different components. In addition, when the liquid material passes through the cross thread, due to the scouring effect of the turbulent flow, the adhesion and deposition on the pump wall are reduced.

[0061] The first cross thread 1011 and the second cross thread 1021 of the present invention are used for mixing and conveying liquids, which not only improves the mixing efficiency, but also ensures that the liquid material has uniform composition during the conveying process. It is suitable for liquid materials that need to be uniformly mixed, such as chemical raw materials, coatings, medicines, etc.

[0062] In one embodiment, if Figure 7 As shown, the cleaning rod 109 includes a mounting portion and a rod portion connected to the mounting portion. The mounting portion is a shell structure with an opening. The mounting portion is sleeved on the limiting ring 1095. The rod portion has an internal thread groove 1091 and is connected to the open end of the mounting portion.

[0063] Among them, a limiting screw 1092 is installed on the mounting part, and a ring groove is provided on the outer peripheral wall of the limiting ring 1095. One end of the limiting screw 1092 can be inserted into the ring groove and slide along the ring groove to connect the mounting part and the limiting ring 1095, and enable the cleaning rod 109 to rotate relative to the limiting ring 1095.

[0064] In this embodiment, the sliding limit rod 110 is connected to the limit ring 1095, and the limit ring 1095 is connected to the cleaning rod 109, so the sliding limit rod 110 can drive the limit ring 1095 and the cleaning rod 109 to move axially. Because the limit ring 1095 and the cleaning rod 109 are rotatably connected, the cleaning rod 109 can rotate relative to the limit ring 1095 under the action of the threaded rod 112 to drive the lever assembly to clean the surface of the diaphragm 119.

[0065] In one embodiment, the lever assembly includes a plurality of hard rods 1093 and a plurality of soft rods 1094, wherein the plurality of hard rods 1093 are distributed in a circle with the axis of the cleaning rod 109 as the center, and soft rods 1094 are respectively installed on one end of the hard rod 1093 away from the cleaning rod 109, wherein the shape of the soft rod 1094 matches the shape of the diaphragm 119, wherein the soft rod 1094 is made of elastic material, and the soft rod 1094 can change with the change of the diaphragm 119 and maintain a tendency to stick to the diaphragm 119 during the change process.

[0066] In this embodiment, during the reciprocating motion of the diaphragm 119, the lever assembly moves along with it driven by the cleaning rod 109, and the hard rod 1093 and the soft rod 1094 on the lever assembly will contact the diaphragm 119 to remove the material attached to the diaphragm 119 and prevent the material from being deposited in the pump.

[0067] In one embodiment, if Figure 7 As shown, the liquid material transport pump further includes a diaphragm limit plate 115 , which is disposed between the diaphragm 119 and the sliding limit rod 110 to limit the movement range of the diaphragm 119 .

[0068] In this embodiment, when the driving device 104 pushes the sliding limit rod 110 to move, the diaphragm limit plate 115 limits the movement range of the diaphragm 119, and the diaphragm limit plate 115 provides additional protection for the diaphragm 119 to prevent it from excessive expansion and damage, thereby improving the reliability and durability of the pump.

[0069] In one embodiment, if Figure 4 As shown, a friction block 111 is provided on the threaded rod 112, and the liquid material transport pump further includes an electromagnetic extrusion block 113. When the electromagnetic extrusion block 113 acts on the friction block 111, the threaded rod 112 remains stationary, so that when the cleaning rod 109 moves, it rotates under the action of the threaded rod 112. The friction block 111 and the threaded rod 112 are fixedly connected.

[0070] In this embodiment, a friction block 111 is provided on the threaded rod 112, and an electromagnetic extrusion block 113 is provided, so that the threaded rod 112 can be accurately controlled to remain stationary when needed. When the electromagnetic extrusion block 113 acts on the friction block 111, the threaded rod 112 does not rotate, so that the cleaning rod 109 can stably rotate around the threaded rod 112 when moving.

[0071] However, during the high-speed movement of the material pump, the electromagnetic extrusion block 113 no longer acts on the friction block 111. Since the cleaning rod 109 and the threaded rod 112 are threadedly matched, when the sliding limit rod 110 drives the cleaning rod 109 to move, the cleaning rod 109 drives the threaded rod 112 and the friction block 111 to move axially.

[0072] The present invention uses the electromagnetic extrusion block 113 to act on the friction block 111 to keep the threaded rod 112 in a stationary state, thereby ensuring that the rotational movement of the cleaning rod 109 is more stable and controllable, thereby improving the working efficiency and reliability of the pump.

[0073] In one embodiment, if Figure 3 , Figure 6 and Figure 7 As shown, a buffer diaphragm 107 connected to the inner wall of the diaphragm cavity 103 is provided in the liquid cavity 106, a buffer cavity 114 is formed between the buffer diaphragm 107 and the cavity wall of the diaphragm cavity 103, a first air inlet 108 connected to the air source is provided on the cavity wall of the diaphragm cavity 103, and the first air inlet 108 is connected to the buffer cavity 114. Among them, the air cavity 105, the liquid cavity 106 and the buffer cavity 114 are not connected to each other.

[0074] In this embodiment, a buffer diaphragm 107 is arranged on the inner wall on the opposite side of the diaphragm 119 (i.e., the cavity wall of the diaphragm cavity 103), and a buffer cavity 114 is arranged between the buffer diaphragm 107 and the cavity wall of the diaphragm cavity 103. By adjusting the gas in the buffer cavity 114, the initial position of the buffer diaphragm 107 can be changed.

[0075] The present invention changes the initial position of the buffer diaphragm 107 through the buffer cavity 114 to ensure that the buffer diaphragm 107 has enough space to move, so as to solve the problem that when the feed pump stops conveying liquid material, the position of the diaphragm 119 is random, resulting in the buffer diaphragm 107 having no space to move.

[0076] Moreover, in actual application, the pump includes not only the suction state and the discharge state, but also the idling (dry running) state, that is, the mechanical parts of the pump are still running, but the liquid is not sucked in or discharged. This state can effectively maintain the pressure inside the pump to protect the pump from damage. For example, when the pump is waiting for further control instructions, it needs to remain in the idling state so that it can respond quickly when receiving the control instruction.

[0077] Therefore, when the material pump is in an idling state, the buffer diaphragm 107 and the diaphragm 119 move simultaneously, and the retained material in the liquid cavity 106 is caused to flow without changing the pressure in the pump body, thereby avoiding problems such as solidification caused by its stagnation.

[0078] When the material pump is working and conveying liquid materials, the pressure in the pump body will suddenly increase at the moment of pump startup by keeping the buffer diaphragm 107 in an incompletely fixed state. The movement of the buffer diaphragm 107 absorbs this initial impact energy and reduces the resistance when the pump is started.

[0079] The incompletely fixed buffer diaphragm 107 can buffer the pressure fluctuations in the pump when the pump is started and stopped, avoiding high resistance caused by a sudden increase in pressure. The incompletely fixed buffer diaphragm 107 can adapt to pressure changes more flexibly, reduce stress concentration, and thus reduce the stress on the diaphragm 119 and reduce the scouring force on the pump body.

[0080] Here, "incompletely fixed" means that the buffer diaphragm 107 has a certain amount of room for movement and is not completely rigidly fixed to the wall of the diaphragm cavity 103. This design allows the buffer diaphragm 107 to move or deform to a certain extent as the pressure in the pump changes, that is, the buffer diaphragm 107 dynamically adapts to the pressure fluctuations in the pump, rather than always maintaining a constant shape.

[0081] In one embodiment, if Figure 6 and Figure 8 As shown, a sealing diaphragm 118 is provided on the inner wall of the diaphragm cavity 103 near the feed end, and an airbag 117 is provided between the sealing diaphragm 118 and the cavity wall of the diaphragm cavity 103. The airbag 117 is used to adjust the space of the channel for liquid material to enter the diaphragm cavity 103 from the feed end. A second air inlet nozzle 116 connected to the air source is provided on the cavity wall of the diaphragm cavity 103, and the second air inlet nozzle 116 is connected to the airbag 117.

[0082] In this embodiment, through a set control program, the pressurization and decompression of different airbags 117 are intermittently changed. The change of the airbag 117 causes the corresponding part of the sealing diaphragm 118 of each airbag 117 to expand or contract. The expansion or contraction of the partial sealing diaphragm 118 at different positions causes the curvature of the wall of the diaphragm cavity 103 to change accordingly, thereby adjusting the channel space for the liquid material to enter the diaphragm cavity 103 from the feed end. The channel space cooperates with the buffer diaphragm 107 in an incompletely fixed state to avoid the influence of the boundary effect during normal transportation and maintain the transportation efficiency.

[0083] In one embodiment, a plurality of airbags 117 are provided, and the plurality of airbags 117 are arranged in layers along the flow direction of the liquid, and each layer has two symmetrically arranged airbags 117, and each airbag 117 in the same layer occupies 180 degrees, and the two airbags 117 can seal the passage, and one of them can be expanded or contracted when in use. The two airbags 117 in the same layer can control air intake independently.

[0084] Furthermore, the airbags 117 of any layer are arranged alternately with the airbags 117 of the adjacent layer. The positions of the lower layer airbags 117 and the upper layer airbags 117 are staggered by 90 degrees, so that the internal passage is more tortuous.

[0085] In this embodiment, by intermittently changing the pressurization and decompression of different air bags 117, the inner wall of the pump body is made to present a changing curvature, thereby avoiding the influence of the boundary effect and maintaining the efficiency of conveying. The constantly changing inner wall can also prevent the solidification of the retained material in the liquid cavity 106 to a certain extent.

[0086] In summary, the working process of the feed pump is as follows:

[0087] When sucking liquid, the driving device 104 controls the gas to leave the gas cavity 105, so that the liquid cavity 106 is negatively pressurized, and the negative pressure causes the material to enter the pump body from the feed port 101 through the first cross thread 1011. When discharging liquid, the driving device 104 controls the gas to enter the gas cavity 105, so that the liquid cavity 106 generates a positive pressure. The positive pressure pushes the fluid in the liquid cavity 106 to leave the discharge port 102 through the second cross thread 1021. When the fluid passes through the first cross thread 1011 and the second cross thread 1021, it will be mixed more evenly due to the effect of the threads.

[0088] During the discharge process, the multiple airbags 117 are alternately inflated and deflated, so that the part of the sealing diaphragm 118 connected to each airbag 117 expands or contracts, so as to change the use form of the entire sealing diaphragm 118, so as to achieve the purpose of changing the curvature of the inner wall (i.e., the channel) of the pump body, thereby avoiding the influence of the boundary effect during normal delivery and maintaining the delivery efficiency. In addition, during the discharge process, when the buffer diaphragm 107 is impacted, the buffer cavity 114 provides a buffering effect to reduce the internal pressure change.

[0089] During the continuous operation of the material pump, the driving device 104 drives the sliding limit rod 110 to move left and right, and the sliding limit rod 110 drives the cleaning rod 109 to move linearly. At this time, the friction block 111 is squeezed by the electromagnetic squeezing block 113, so that the threaded rod 112 connected to the friction block 111 remains stationary. Because the internal thread groove 1091 cooperates with the threaded rod 112, the linear motion of the cleaning rod 109 is converted into rotational motion. The rotation of the cleaning rod 109 drives the hard rod 1093 and the soft rod 1094 to rotate, so as to clean the residue on the diaphragm 119 and reduce deposition.

[0090] Among them, when the feed pump moves faster, the electromagnetic extrusion block 113 no longer limits the friction block 111. When the sliding limit rod 110 drives the cleaning rod 109 to move, the cleaning rod 109 drives the threaded rod 112 threadedly connected to it to move, so that the friction block 111 can move left and right, and the threaded rod 112 no longer causes the cleaning rod 109 to rotate, thereby reducing the working resistance of the diaphragm 119.

[0091] When the pump is in an idling state, in order to prevent the liquid material retained in the liquid cavity 106 from settling, the second air inlet nozzle 116 and the first air inlet 108 are still controlled to continue to work to prevent the internal fluid from settling. At this time, the air pressure in the air cavity 105 changes, causing the diaphragm 119 to still move left and right, and the buffer diaphragm 107 moves with it, preventing the volume change in the liquid cavity 106 from causing the liquid to flow out of the one-way valve 1012.

[0092] Since the stop position of the material pump is uncertain and the volume of the liquid in the liquid cavity 106 is uncertain, the distance that the sliding limit rod 110 moves left and right is affected by the volume of the buffer cavity 114 and cannot move too far to prevent the buffer cavity 114 from being unable to keep up with the changes in the air cavity 105. That is, when the pump is stopped and started, the change in the volume of the liquid in the liquid cavity 106 is adapted by reasonably controlling the moving distance of the sliding limit rod 110 and the volume of the buffer cavity 114 to ensure smooth start-up and operation of the pump.

[0093] The pump body maintains internal balance to prevent liquid material sedimentation and pump body damage until the liquid material is transported again.

[0094] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0095] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A liquid material transport pump, characterized in that: include: A pump body, comprising a feed port (101), a diaphragm cavity (103) and a discharge port (102) which are interconnected, wherein the feed end of the diaphragm cavity (103) and the discharge end thereof are respectively provided with a resettable one-way valve (1012); a diaphragm (119) disposed in the diaphragm cavity (103) to divide the diaphragm cavity (103) into a liquid cavity (106) and an air cavity (105); A connecting rod assembly is arranged on a side of the diaphragm (119) located in the air cavity (105), and the connecting rod assembly comprises: A sliding limit rod (110) is disposed in the air cavity (105), and the sliding limit rod (110) is capable of reciprocating along an axial direction; A threaded rod (112) disposed at one end of the inner cavity of the sliding limit rod (110); A limiting ring (1095) connected to the sliding limiting rod (110), wherein the diaphragm (119) is arranged between the limiting ring (1095) and the sliding limiting rod (110); A cleaning rod (109) is rotatably arranged on the limiting ring (1095), and one end of the cleaning rod (109) passes through the inner cavity of the limiting ring (1095) and the sliding limiting rod (110) and is connected to the threaded rod (112) through a spiral transmission. When the sliding limiting rod (110) moves horizontally, it drives the cleaning rod (109) to move horizontally through the limiting ring (1095), and when the cleaning rod (109) moves, it rotates under the action of the threaded rod (112); a driving device (104) disposed near the center of the pump body and connected to the sliding limit rod (110), the driving device (104) being used to drive the sliding limit rod (110) to reciprocate in the axial direction and also being used to inflate or exhaust the air cavity (105) so as to expand or contract the diaphragm (119); A lever assembly is arranged on a side of the diaphragm (119) located in the liquid chamber (106) and is connected to the cleaning rod (109). When the cleaning rod (109) rotates, the lever assembly is driven to move to clean the side of the diaphragm (119) located in the liquid chamber (106).

2. The liquid material transport pump according to claim 1, characterized in that: The cleaning rod (109) comprises a mounting portion and a rod portion connected to the mounting portion, wherein the mounting portion is a shell structure having an opening, the mounting portion is sleeved on the limiting ring (1095), and the rod portion has an internal thread groove (1091) and is connected to the open end of the mounting portion.

3. The liquid material transport pump according to claim 2, characterized in that: A limiting screw (1092) is installed on the mounting portion, and an annular groove is provided on the outer peripheral wall of the limiting ring (1095). One end of the limiting screw (1092) can be inserted into the annular groove and slide along the annular groove to connect the mounting portion and the limiting ring (1095) and enable the cleaning rod (109) to rotate relative to the limiting ring (1095).

4. The liquid material transport pump according to claim 2, characterized in that: The lever assembly includes a plurality of hard rods (1093) and a plurality of soft rods (1094). The plurality of hard rods (1093) are distributed in a circle with the axis of the cleaning rod (109) as the center. The soft rods (1094) are respectively installed on one end of the hard rod (1093) away from the cleaning rod (109). The shape of the soft rods (1094) matches the shape of the diaphragm (119).

5. The liquid material transport pump according to claim 4, characterized in that: The liquid material transport pump further comprises a diaphragm limit plate (115), wherein the diaphragm limit plate (115) is arranged between the diaphragm (119) and the sliding limit rod (110) and is used to support the diaphragm (119).

6. The liquid material transport pump according to claim 1, characterized in that: The threaded rod (112) is provided with a friction block (111), and the liquid material transport pump further comprises an electromagnetic extrusion block (113). When the electromagnetic extrusion block (113) acts on the friction block (111), the threaded rod (112) remains stationary, so that the cleaning rod (109) rotates under the action of the threaded rod (112) when it moves.

7. The liquid material transport pump according to claim 1, characterized in that: A buffer diaphragm (107) connected to the inner wall of the diaphragm cavity (103) is provided in the liquid cavity (106), and a buffer cavity (114) is formed between the buffer diaphragm (107) and the cavity wall of the diaphragm cavity (103). A first air inlet (108) connected to an air source is provided on the cavity wall of the diaphragm cavity (103), and the first air inlet (108) is connected to the buffer cavity (114).

8. The liquid material transport pump according to claim 1, characterized in that: A sealing diaphragm (118) is provided on the inner wall of the diaphragm cavity (103) close to the feed end, and an air bag (117) is provided between the sealing diaphragm (118) and the cavity wall of the diaphragm cavity (103). The air bag (117) is used to adjust the space of the channel for liquid material to enter the diaphragm cavity (103) from the feed end. A second air inlet nozzle (116) connected to an air source is provided on the cavity wall of the diaphragm cavity (103), and the second air inlet nozzle (116) is connected to the air bag (117).

9. The liquid material transport pump according to claim 8, characterized in that: A plurality of the airbags (117) are provided, and the plurality of the airbags (117) are arranged in layers along the flow direction of the liquid, and each layer has two symmetrically arranged airbags (117). The two airbags (117) can seal the channel, and can selectively expand or contract when in use; the airbags (117) in any layer are arranged alternately with the airbags (117) in the adjacent layer.

10. The liquid material transport pump according to claim 1, characterized in that: The feed port (101) is provided with a first cross thread (1011), and the discharge port (102) is provided with a second cross thread (1021), and the first cross thread (1011) and the second cross thread (1021) are used for mixing and conveying liquid.

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