Liquid variable-volume pump with leakage-proof function

Abstract

The invention belongs to the technical field of liquid variable displacement pumps, and discloses a liquid variable displacement pump with a leakage-proof function, the liquid variable displacement pump comprises a driving mechanism and a hydraulic mechanism, the hydraulic mechanism comprises a cylinder sleeve, a plunger movably sleeved in the cylinder sleeve, a communicating barrel arranged at the end part of the cylinder sleeve in a communicating manner, and a cylinder end sealing element positioned at the end part of the cylinder sleeve and sleeved on the outer side of the plunger. By means of the second hydraulic control part additionally arranged in the inlet ball valve part and the first hydraulic control part additionally arranged in the outlet ball valve part, inflation expansion of the sealing air bags at the corresponding positions of the inlet ball valve part and the outlet ball valve part is achieved, and the sealing air bags are matched with the stepped seal in the sealing seat; according to the liquid variable-volume pump, secondary reinforced sealing at the inlet and the outlet is achieved, the situation that impurity particles are blocked on the sealing seat to cause gaps in the sealing face is avoided, the sealing effect at the inlet and the outlet is enhanced through the multiple sealing effect achieved automatically, the leakage problem is effectively avoided, and the using effect and stability of the liquid variable-volume pump are greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid variable displacement pumps, and in particular relates to a liquid variable displacement pump with a leak-proof function. Background Art

[0002] A liquid variable displacement pump is a mechanical device that transports liquid by periodically changing the volume of the pump chamber. Its core feature is that the flow rate is proportional to the rotational speed and is independent of the outlet pressure. It mainly includes piston pumps, plunger pumps, diaphragm pumps and gear pumps.

[0003] The liquid variable displacement pump in the prior art, during use, is used to process the plunger pump, and usually uses two sets of ball valves directly connected by springs to realize automatic control of the inlet and outlet respectively. However, the current sealing only relies on the friction and extrusion between the ball valve and the sealing seat bracket. When the actual sealing surface is small and is interfered with by impurities such as particulate matter, the contact effect between the ball valve and the sealing seat becomes poor, thereby affecting the sealing effect and posing a risk of leakage. As a result, insufficient suction pressure and pumping leakage occur during the actual pumping process, which greatly reduces the pumping stability and has a poor use effect. Summary of the Invention

[0004] The object of the present invention is to provide a liquid variable displacement pump with a leak-proof function to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned object, the present invention provides the following technical solution: a liquid variable displacement pump with a leak-proof function, comprising a drive mechanism and a hydraulic mechanism, the hydraulic mechanism comprising a cylinder sleeve, a plunger movably sleeved in the cylinder sleeve, a connecting tube connected to the end of the cylinder sleeve, and a cylinder end seal located at the end of the cylinder sleeve and sleeved on the outside of the plunger, wherein an inlet ball valve component and an outlet ball valve component are respectively provided inside the connecting tube, a hydraulic control unit 2 is provided inside the inlet ball valve component, a hydraulic control unit 1 is provided inside the outlet ball valve component, two sets of sealing assemblies are respectively provided inside the connecting tube, and an outer sleeve is provided on the outside of the cylinder sleeve. The sealing assembly includes a sealing seat, a sealing airbag and an annular groove. The two groups of sealing assemblies respectively control the sealing and opening of the suction end and the pump outlet end of the connecting cylinder. The two groups of sealing assemblies correspond one-to-one to the inlet ball valve component and the outlet ball valve component respectively. The two groups of sealing airbags are respectively connected to the hydraulic control part 1 and the hydraulic control part 2. When the plunger moves to inhale, the hydraulic control part 2 inside the inlet ball valve component controls the corresponding sealing airbag to contract, and fully opens the inlet as the inlet ball valve component moves. When the plunger moves and compresses, the hydraulic control part 1 inside the outlet ball valve component controls the corresponding sealing airbag to contract, and fully opens the outlet as the outlet ball valve component moves.

[0006] Preferably, the top and bottom of the connecting tube are the outlet end and the inlet end respectively, the bottom of the connecting tube is detachably provided with a filter sleeve, the side of the connecting tube is provided with an intermediate cavity, and the interior of the connecting tube is provided with an assembly cavity, and the outlet ball valve component and the inlet ball valve component are arranged up and down in the assembly cavity of the connecting tube.

[0007] Preferably, the outlet ball valve component includes a ball valve 1, a spring 1 and a connecting ring 1, the ball valve 1 is located in the assembly cavity, one end of the spring 1 is fixed in the assembly cavity, and the other end is fixedly connected to the connecting ring 1, and the connecting ring 1 is fixed on the outside of the ball valve 1, and the inlet ball valve component includes a ball valve 2, a spring 2, a connecting ring 2 and a positioning frame, the spring 2 is fixedly connected between the positioning frame and the connecting ring 2, the connecting ring 2 is fixed on the outside of the ball valve 2, and the positioning frame is fixed in the intermediate cavity.

[0008] Preferably, the sealing seat includes an annular seat and an annular protrusion, the annular seat is fixedly sleeved in the assembly cavity, the annular protrusion is arranged on the annular inner wall of the annular seat, the outer side surface of the annular seat is provided with a sealing ring surface 1, and the outer side surface of the annular protrusion is provided with a sealing ring surface 2.

[0009] Preferably, the annular grooves are respectively opened on the outer sides of the first ball valve and the second ball valve, the annular grooves correspond to and are connected with the sealing airbags one by one, and the sealing airbags are nested in the side faces of the annular protrusions when inflated.

[0010] Preferably, the hydraulic control part 1 includes a through hole 1, a connecting slide cavity, a piston plate 1, a spring 3 and a piston frame. The connecting slide cavity and the through hole 1 are both opened inside the ball valve 1, and the two ends of the connecting slide cavity are respectively connected to the through hole 1 and the ring groove. The piston plate 1 is fixedly connected to the spring 3 and is elastically connected to the through hole 1 through the spring 3. One end of the piston frame is movably sleeved in the connecting slide cavity, and the other end is fixedly connected to the piston plate 1. When the piston plate 1 is compressed, the sealing airbag expands.

[0011] Preferably, the hydraulic control part 2 includes a through hole 2, a conducting cavity, a piston plate 2 and a spring 4. The through hole 2 and the conducting cavity are both opened inside the ball valve 2. The two ends of the conducting cavity are respectively connected to the through hole 2 and the ring groove. The piston plate 2 is fixedly connected to the spring 4 and is elastically connected to the inside of the through hole 2 through the spring 4. When the piston plate 2 is compressed, the sealing airbag expands.

[0012] Preferably, an impact column is fixedly provided at one end of the inlet ball valve member, the impact column is fixed on the second ball valve and moves with the second ball valve, and the impact column impacts the filter sleeve when the second ball valve is sealed with the sealing assembly.

[0013] Preferably, one end of the second hydraulic control part is fixedly connected to a linkage component, and an intermittent magnetic attraction part is provided inside the middle cavity. The linkage component causes the intermittent magnetic attraction part to generate local magnetism when the cylinder liner is sucked in, and the linkage component causes the local magnetism of the intermittent magnetic attraction part to disappear when the cylinder liner is pressed out.

[0014] Preferably, the linkage assembly includes a connecting rod, a fixed plate and a connecting curved plate, one end of the connecting rod is fixed on the piston plate 2, the fixed plate is fixedly connected to the outer end of the connecting rod, the connecting rod is fixedly connected to the connecting curved plate, the intermittent magnetic attraction part includes a metal rod, a permanent magnet, a connecting column and a spring five, an adaptation cavity is provided inside the connecting tube, the metal rod is fixed inside the connecting tube, the spring five is fixedly connected between the connecting column and the permanent magnet, the connecting curved plate is fixedly connected to the connecting column and controls the lateral movement of the connecting column, and the connecting column is located in the adaptation cavity.

[0015] The beneficial effects of the present invention are as follows: (1) The present invention utilizes the hydraulic control part 2 added to the inlet ball valve component and the hydraulic control part 1 added to the outlet ball valve component to respectively realize the inflation of the sealing airbags at the corresponding parts of the inlet ball valve component and the outlet ball valve component, and cooperates with the step seal in the sealing seat and the sealing airbag to realize the secondary reinforced sealing at the inlet and outlet, thereby avoiding the impurity particles from being stuck on the sealing seat and causing the gap in the sealing surface. Through the multiple sealing effects realized automatically, the sealing effect at the inlet and outlet is enhanced, the leakage problem is effectively avoided, and the use effect and stability of the liquid variable displacement pump are greatly improved.

[0016] (2) The present invention uses an inlet ball valve with automatic opening and closing action, and utilizes a reciprocating action to drive the movement of the connected impact column, which cooperates with the filter sleeve at the inlet. During the reciprocating action of the pump suction, the impact column realizes a reciprocating collision with the filter sleeve, so that the filter sleeve forms a stable self-vibration. The self-vibration is used to separate the blockage in the filter hole, realize automatic clearing, avoid suction fluctuations caused by blockage, improve suction stability, reduce the clearing process, and have a good use effect.

[0017] (3) The present invention further utilizes the hydraulic control part 2 in the imported ball valve member. When the hydraulic control part 2 moves back and forth during the pumping process, the intermittent magnetic attraction part is controlled to generate magnetism through the connected linkage component. Specifically, the permanent magnet is controlled to collide with the metal rod during the suction stage, so that the metal rod generates magnetism and absorbs metal impurities in the sucked liquid. In the pumping process, the permanent magnet and the metal rod are automatically separated, and the magnetism of the metal rod disappears, so that the metal impurities that have lost their magnetism are pumped out together with the pumped liquid. The position of the metal impurities in the liquid is effectively controlled to avoid entering the cylinder sleeve to cause plunger jamming and wear, and the use of the filter part built into the cylinder sleeve to affect the pumping effect is avoided. Under stable pumping processing, fixed-point collection during the liquid suction process and automatic separation during the pumping process are achieved, which greatly improves the service life of the plunger pump and has a good use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a cross-sectional schematic diagram of the present invention; Figure 3 It is a cross-sectional schematic diagram of the connecting cylinder, the inlet ball valve component and the outlet ball valve component of the present invention; Figure 4 It is a schematic cross-sectional view of the connecting tube of the present invention; Figure 5 Schematic cross-sectional view of the outlet ball valve and the hydraulic control unit of the present invention; Figure 6 It is a cross-sectional schematic diagram of the imported ball valve component and the hydraulic control unit 2 of the present invention; Figure 7 This is a schematic diagram of the connection between the linkage component and the intermittent magnetic attraction component of the present invention; Figure 8 It is a schematic cross-sectional view of the sealing seat of the present invention.

[0019] Figure: 1, cylinder sleeve; 2, outer sleeve; 3, connecting tube; 4, plunger; 5, cylinder end seal; 6, outlet ball valve component; 61, ball valve 1; 62, spring 1; 63, connecting ring 1; 7, inlet ball valve component; 71, ball valve 2; 72, spring 2; 73, connecting ring 2; 74, positioning frame; 8, filter sleeve; 9, intermediate chamber; 10, assembly chamber; 11, adapter chamber; 12, impact rod; 13, hydraulic control unit 1; 131, through hole 1; 132, connecting slide chamber; 133, piston plate 1; 134, spring 3; 135 , piston rack; 14, hydraulic control unit two; 141, through hole two; 142, conduction cavity; 143, piston plate two; 144, spring four; 15, sealing seat; 151, annular seat; 152, annular protrusion; 153, sealing ring surface one; 154, sealing ring surface two; 16, sealing airbag; 17, ring groove; 18, linkage assembly; 181, connecting rod; 182, fixed plate; 183, connecting curved plate; 19, intermittent magnetic attraction unit; 191, metal rod; 192, permanent magnet; 193, connecting column; 194, spring five. DETAILED DESCRIPTION

[0020] 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.

[0021] like Figures 1 to 8 As shown, an embodiment of the present invention provides a liquid variable displacement pump with a leak-proof function, including a driving mechanism and a hydraulic mechanism, the hydraulic mechanism including a cylinder sleeve 1, a plunger 4 movably sleeved in the cylinder sleeve 1, a connecting tube 3 arranged at the end of the cylinder sleeve 1, and a cylinder end seal 5 located at the end of the cylinder sleeve 1 and sleeved on the outside of the plunger 4, an inlet ball valve member 7 and an outlet ball valve member 6 are respectively provided inside the connecting tube 3, a hydraulic control part 2 14 is provided inside the inlet ball valve member 7, a hydraulic control part 1 13 is provided inside the outlet ball valve member 6, two sets of sealing components are respectively provided inside the connecting tube 3, the sealing components include a sealing seat 15, a sealing airbag 16 and an annular groove 17, the two The two sealing assemblies respectively control the sealing and opening of the suction end and the pump outlet end of the connecting cylinder 3. The two sealing assemblies correspond one to one with the inlet ball valve member 7 and the outlet ball valve member 6 respectively. The two sealing airbags 16 are respectively connected with the hydraulic control part 13 and the hydraulic control part 2 14. When the plunger 4 moves to inhale, the hydraulic control part 2 14 inside the inlet ball valve member 7 controls the corresponding sealing airbag 16 to contract, and fully opens the inlet as the inlet ball valve member 7 moves. When the plunger 4 moves for compression, the hydraulic control part 13 inside the outlet ball valve member 6 controls the corresponding sealing airbag 16 to contract, and fully opens the outlet as the outlet ball valve member 6 moves. An outer sleeve 2 is provided on the outside of the cylinder liner 1.

[0022] Example 1: During suction, the driving mechanism drives the plunger 4 to move along the inside of the cylinder sleeve 1 and expands the internal space of the cylinder sleeve 1, causing negative pressure inside the cylinder sleeve 1. The negative pressure acts on the hydraulic control part 2 14 inside the inlet ball valve member 7, causing the piston plate 2 143 in the through hole 2 141 to move, driving the spring 4 144 to stretch, so that the air in the sealing airbag 16 is sucked through the guide cavity 142 and the annular groove 17, causing the sealing airbag 16 to shrink. The negative pressure further acts on the ball valve 2 71 to compress the spring 2 72, opening the seal in the sealing assembly. Seat 15, the external liquid is filtered by the filter sleeve 8 and then sucked into the middle cavity 9 through the sealing seat 15, and then into the interior of the cylinder liner 1. At this time, the ball valve 161 is pressed against the sealing seat 15 under the action of negative pressure. At the same time, the negative pressure acts on the hydraulic control part 13, and the piston plate 133 in the through hole 131 moves downward, stretching the spring 3 134 and driving the piston rack 135 to move downward, pressing the air in the connecting sliding cavity 132 into the sealing airbag 16 through the annular groove 17. The sealing airbag 16 at the upper outlet is inflated and performs secondary sealing at the outlet. When pressing out, as the plunger 4 moves in the opposite direction and compresses, the internal hydraulic pressure increases, the spring 2 72 drives the ball valve 2 71 to reset first to complete the preliminary sealing of the inlet end, and the hydraulic pressure acts on the through hole 2 141, pushing the piston plate 2 143 to move, and compressing the spring 4 144 while compressing the air inside the conduction cavity 142 into the corresponding sealing airbag 16 through the annular groove 17. The expanded sealing airbag 16 is pressed and filled in the sealing seat 15 to complete the secondary sealing. At the same time, when the internal compression hydraulic pressure of the intermediate cavity 9 increases, the hydraulic pressure is The hydraulic pressure acts on the hydraulic control part 13 of the outlet ball valve member 6, and the hydraulic pressure acts on the through hole 131, pushing the piston plate 133 to move, compressing the spring 3 134, and driving the piston frame 135 to move upward along the connecting slide cavity 132, extracting the air in the connecting slide cavity 132, so that the air in the corresponding sealing airbag 16 is sucked through the annular groove 17, and the sealing airbag 16 contracts. The hydraulic pressure acts on the ball valve 61, so that the sealing seat 15 corresponding to the upper outlet is fully opened, and pumping is performed at this time.

[0023] First, by utilizing the hydraulic control unit 2 14 added to the inlet ball valve component 7 and the hydraulic control unit 1 13 added to the outlet ball valve component 6, the sealing airbags 16 at the corresponding positions of the inlet ball valve component 7 and the outlet ball valve component 6 are respectively inflated and expanded, and the stepped seal in the sealing seat 15 cooperates with the sealing airbag 16 to achieve secondary reinforced sealing at the inlet and outlet, thereby preventing foreign particles from being stuck on the sealing seat 15 and causing gaps in the sealing surface. Through the automatically realized multiple sealing effects, the sealing effect at the inlet and outlet is enhanced, leakage problems are effectively avoided, and the use effect and stability of the liquid variable displacement pump are greatly improved.

[0024] Example 2: As the plunger 4 reciprocates, the inlet ball valve member 7 reciprocates, and during the reciprocating movement, it drives the impact column 12 to reciprocate. The reciprocating impact column 12 continuously strikes the installed filter sleeve 8, causing the filter sleeve 8 itself to vibrate, so that the blocked impurities are separated and the blockage is automatically cleared; and as the reciprocating movement occurs, the hydraulic control part 2 14 in the inlet ball valve member 7 reciprocates synchronously, and during the reciprocating movement, it drives the connected linkage assembly 18 to reciprocate horizontally, and the linkage assembly 18 drives the connecting column 193 in the intermittent magnetic attraction part 19 to move, and drives the permanent magnet 192 to intermittently contact the metal rod 191 Contact and squeeze, and in the process of pumping, the elasticity of spring five 194 is cooperated to maintain the continuous resistance between the permanent magnet 192 and the metal rod 191. During the resistance period, the metal rod 191 obtains magnetic force, so that the metal impurities in the sucked liquid are adsorbed in the metal rod 191, and in the process of pumping out, as the hydraulic control part 2 14 moves in the opposite direction and resets, the connecting column 193 is driven to move in the opposite direction and reset, and the permanent magnet 192 is separated from the metal rod 191, so that the metal rod 191 loses its magnetic force, and the metal impurities adsorbed on the metal rod 191 are detached and pumped out together with the pumped liquid through the sealing seat 15 at the outlet.

[0025] Firstly, by using the inlet ball valve member 7 with automatic opening and closing action, the reciprocating action drives the movement of the connected impact column 12, and cooperates with the filter sleeve 8 at the inlet. During the reciprocating action of the pump suction, the impact column 12 realizes the reciprocating collision of the filter sleeve 8, so that the filter sleeve 8 forms a stable self-vibration, and utilizes its own vibration to separate the blockage in the filter hole, realizes automatic clearing, avoids suction fluctuations caused by blockage, improves suction stability, reduces the clearing process, and has a good use effect.

[0026] In addition, by further utilizing the hydraulic control part 2 14 in the inlet ball valve member 7, when the hydraulic control part 2 14 moves back and forth during the pumping process, the intermittent magnetic attraction part 19 is controlled to generate magnetism intermittently through the connected linkage component 18. Specifically, by controlling the permanent magnet 192 to conflict with the metal rod 191 during the suction stage, the metal rod 191 generates magnetism and absorbs metal impurities in the sucked liquid, and during the pumping process, the permanent magnet 192 is automatically separated from the metal rod 191, and the magnetism of the metal rod 191 disappears, so that the metal impurities that have lost their magnetic attraction are pumped out together with the pumped liquid, effectively controlling the position of the metal impurities in the liquid, avoiding entry into the cylinder sleeve 1 to cause the plunger 4 to be stuck and worn, and avoiding the use of the filter part built into the cylinder sleeve 1 to affect the pumping effect, ensuring stable pumping processing, realizing fixed-point collection during the liquid suction process, and automatic separation during the pumping process, greatly improving the service life of the plunger pump, and having good use effect.

[0027] Among them, the top and bottom of the connecting tube 3 are the outlet end and the inlet end respectively, the bottom of the connecting tube 3 is detachably provided with a filter sleeve 8, the side of the connecting tube 3 is provided with an intermediate cavity 9, and the interior of the connecting tube 3 is provided with an assembly cavity 10, and the outlet ball valve component 6 and the inlet ball valve component 7 are arranged up and down in the assembly cavity 10 of the connecting tube 3.

[0028] By using the filter sleeve 8 to achieve inlet filtration at the inlet end, a large amount of foreign particles are prevented from entering the pump body. The outlet ball valve member 6 and the inlet ball valve member 7 are aligned with the outlet end and the inlet end respectively.

[0029] Among them, the outlet ball valve component 6 includes a ball valve 1 61, a spring 1 62 and a connecting ring 1 63. The ball valve 1 61 is located in the assembly cavity 10. One end of the spring 1 62 is fixed in the assembly cavity 10, and the other end is fixedly connected to the connecting ring 1 63. The connecting ring 1 63 is fixed on the outside of the ball valve 1 61. The inlet ball valve component 7 includes a ball valve 2 71, a spring 2 72, a connecting ring 2 73 and a positioning frame 74. The spring 2 72 is fixedly connected between the positioning frame 74 and the connecting ring 2 73. The connecting ring 2 73 is fixed on the outside of the ball valve 2 71. The positioning frame 74 is fixed in the intermediate cavity 9.

[0030] The outlet ball valve member 6 realizes sealing control at the outlet, and the inlet ball valve member 7 realizes sealing at the inlet.

[0031] Among them, the sealing seat 15 includes an annular seat 151 and an annular protrusion 152. The annular seat 151 is fixedly sleeved in the assembly cavity 10. The annular protrusion 152 is arranged on the annular inner wall of the annular seat 151. The outer side surface of the annular seat 151 is provided with a sealing ring surface 153, and the outer side surface of the annular protrusion 152 is provided with a sealing ring surface 2 154.

[0032] The sealing seat 15 utilizes the sealing ring surface 153 and the sealing ring surface 2 154 to achieve multi-layer sealing, and the annular protrusion 152 cooperates with the inflated sealing airbag 16 to achieve three-level sealing.

[0033] The annular grooves 17 are respectively provided on the outer sides of the ball valve 1 61 and the ball valve 2 71 . The annular grooves 17 correspond to and are connected with the sealing airbags 16 . When the sealing airbags 16 are expanded, they are nested in the side faces of the annular protrusions 152 .

[0034] There are two annular grooves 17 , which are located on the outside of the first ball valve 61 and the second ball valve 71 respectively, and are used to control the ventilation and expansion of the sealing airbag 16 .

[0035] Among them, the hydraulic control part 13 includes a through hole 131, a connecting slide chamber 132, a piston plate 133, a spring 3 134 and a piston frame 135. The connecting slide chamber 132 and the through hole 131 are both opened inside the ball valve 61, and the two ends of the connecting slide chamber 132 are respectively connected to the through hole 131 and the annular groove 17. The piston plate 133 is fixedly connected to the spring 3 134 and elastically connected to the through hole 131 through the spring 3 134. One end of the piston frame 135 is movably sleeved in the connecting slide chamber 132, and the other end is fixedly connected to the piston plate 133. When the piston plate 133 is compressed, the sealing airbag 16 expands.

[0036] The hydraulic control unit 13 is used to realize the inflation expansion control of the sealing airbag 16 corresponding to the outlet ball valve member 6, and complete the automatic three-level sealing control.

[0037] Among them, the hydraulic control part 2 14 includes a through hole 2 141, a conducting cavity 142, a piston plate 2 143 and a spring 4 144. The through hole 2 141 and the conducting cavity 142 are both opened inside the ball valve 2 71. The two ends of the conducting cavity 142 are respectively connected to the through hole 2 141 and the annular groove 17. The piston plate 2 143 is fixedly connected to the spring 4 144 and elastically connected to the inside of the through hole 2 141 through the spring 4 144. When the piston plate 2 143 is compressed, the sealing airbag 16 expands.

[0038] The hydraulic control unit 2 14 is used to realize the inflation expansion control of the corresponding sealing airbag 16 of the imported ball valve member 7, and complete the automatic three-level sealing control.

[0039] Among them, an impact column 12 is fixed at one end of the inlet ball valve member 7. The impact column 12 is fixed on the second ball valve 71 and moves with the second ball valve 71. When the impact column 12 follows the second ball valve 71 to seal with the sealing assembly, it impacts the filter sleeve 8.

[0040] The reciprocating impact treatment of the filter sleeve 8 is achieved by utilizing the impact column 12 without the need for additional power. In conjunction with the action of the imported ball valve member 7, synchronous treatment is completed to achieve automatic blockage clearing and ensure stable suction hydraulic pressure.

[0041] Among them, one end of the hydraulic control part 14 is fixedly connected to a linkage assembly 18, and an intermittent magnetic part 19 is provided inside the middle cavity 9. The linkage assembly 18 makes the intermittent magnetic part 19 generate local magnetism when the cylinder liner 1 is sucked in, and the linkage assembly 18 makes the intermittent magnetic part 19 locally magnetized when the cylinder liner 1 is pressed out. The linkage assembly 18 includes a connecting rod 181, a fixed plate 182 and a connecting curved plate 183. One end of the connecting rod 181 is fixed on the piston plate 143, and the fixed plate 182 is fixedly connected to the connecting rod 18 1, the connecting rod 181 is fixedly connected to the connecting curved plate 183, the intermittent magnetic attraction portion 19 includes a metal rod 191, a permanent magnet 192, a connecting column 193 and a spring five 194, an adapting cavity 11 is provided inside the connecting cylinder 3, the metal rod 191 is fixed inside the connecting cylinder 3, the spring five 194 is fixedly connected between the connecting column 193 and the permanent magnet 192, the connecting curved plate 183 is fixedly connected to the connecting column 193, and controls the lateral movement of the connecting column 193, and the connecting column 193 is located in the adapting cavity 11.

[0042] By utilizing the reciprocating action of the hydraulic control unit 2 14 and cooperating with the linkage component 18, the intermittent magnetic control of the intermittent magnetic attraction unit 19 is realized, and a large area of magnetic attraction is generated when the liquid is sucked in to absorb the metal impurities in the liquid. The large area of magnetic attraction is canceled when the liquid is pumped out, so that the adsorbed metal impurities are discharged together with the pumped liquid.

[0043] The working principle and use process of the present invention are as follows: during suction, as the driving mechanism drives the plunger 4 to move along the inside of the cylinder sleeve 1 and expands the internal space of the cylinder sleeve 1, a negative pressure is generated inside the cylinder sleeve 1. The negative pressure acts on the hydraulic control part 2 14 inside the inlet ball valve 7, causing the piston plate 2 143 in the through hole 2 141 to move, driving the spring 4 144 to stretch, so that the air in the sealing airbag 16 is sucked through the conduction cavity 142 and the annular groove 17, causing the sealing airbag 16 to shrink. The negative pressure further acts on the ball valve 2 71 to compress the spring 2 72, opening the sealing group The external liquid is filtered by the filter sleeve 8 and then sucked into the middle cavity 9 through the sealing seat 15, and then into the interior of the cylinder liner 1. At this time, the ball valve 161 is pressed against the sealing seat 15 under the action of negative pressure. At the same time, the negative pressure acts on the hydraulic control part 13, and the piston plate 133 in the through hole 131 moves downward, stretching the spring 3 134 and driving the piston rack 135 to move downward, pressing the air in the connecting sliding cavity 132 into the sealing airbag 16 through the annular groove 17. The sealing airbag 16 at the upper outlet is inflated and performs a secondary seal at the outlet. When pressing out, as the plunger 4 moves in the opposite direction and compresses, the internal hydraulic pressure increases, the spring 2 72 drives the ball valve 2 71 to reset first to complete the preliminary sealing of the inlet end, and the hydraulic pressure acts on the through hole 2 141, pushing the piston plate 2 143 to move, and compressing the spring 4 144 while compressing the air inside the conduction cavity 142 into the corresponding sealing airbag 16 through the annular groove 17. The expanded sealing airbag 16 is pressed and filled in the sealing seat 15 to complete the secondary sealing. At the same time, when the internal compression hydraulic pressure of the intermediate cavity 9 increases, the hydraulic pressure is The hydraulic pressure then acts on the hydraulic control unit 13 of the outlet ball valve member 6. The hydraulic pressure acts on the through hole 131 and pushes the piston plate 133 to move. While compressing the spring 3 134, it drives the piston frame 135 to move upward along the connecting slide chamber 132, pumping out the air in the connecting slide chamber 132. The air in the corresponding sealing airbag 16 is sucked in through the annular groove 17, and the sealing airbag 16 contracts. The hydraulic pressure acts on the ball valve 61, causing the sealing seat 15 corresponding to the upper outlet to fully open, and pumping is now performed. As the plunger 4 reciprocates, the inlet ball valve member 7 reciprocates, and in the process of reciprocating movement, it drives the impact column 12 to reciprocate, and the reciprocating impact column 12 continuously strikes the installed filter sleeve 8, causing the filter sleeve 8 itself to vibrate, so that the blocked impurities are separated and the automatic blockage is completed; and as the reciprocating movement occurs, the hydraulic control part 2 14 in the inlet ball valve member 7 reciprocates synchronously, and the reciprocating movement drives the connected linkage component 18 to reciprocate horizontally, and the linkage component 18 drives the connecting column 193 in the intermittent magnetic attraction part 19 to move, and drives the permanent magnet 192 to intermittently contact and squeeze the metal rod 191. The metal rod 191 is pressurized and the elasticity of the spring five 194 is cooperated with during the pumping process to maintain the continuous resistance between the permanent magnet 192 and the metal rod 191. During the resistance period, the metal rod 191 obtains magnetic force, so that the metal impurities in the sucked liquid are adsorbed in the metal rod 191. In the process of pumping out, as the hydraulic control part 2 14 moves in the opposite direction and resets, the connecting column 193 is driven to move in the opposite direction and reset, and the permanent magnet 192 is separated from the metal rod 191, so that the metal rod 191 loses its magnetic force, and the metal impurities adsorbed on the metal rod 191 are detached and pumped out together with the pumped liquid through the sealing seat 15 at the outlet.

[0044] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A liquid variable displacement pump with a leak-proof function, comprising a drive mechanism and a hydraulic mechanism, the hydraulic mechanism comprising a cylinder sleeve (1), a plunger (4) movably sleeved in the cylinder sleeve (1), a connecting tube (3) arranged at the end of the cylinder sleeve (1), and a cylinder end seal (5) located at the end of the cylinder sleeve (1) and sleeved on the outside of the plunger (4), characterized in that: The interior of the connecting tube (3) is provided with an inlet ball valve component (7) and an outlet ball valve component (6), the interior of the inlet ball valve component (7) is provided with a second hydraulic control unit (14), the interior of the outlet ball valve component (6) is provided with a first hydraulic control unit (13), the interior of the connecting tube (3) is provided with two sets of sealing components, and the outer side of the cylinder sleeve (1) is provided with an outer sleeve (2). The sealing assembly includes a sealing seat (15), a sealing airbag (16) and an annular groove (17). Two groups of the sealing assemblies respectively control the sealing and opening of the suction end and the pump discharge end of the connecting tube (3). The two groups of sealing assemblies correspond to the inlet ball valve component (7) and the outlet ball valve component (6) respectively. The two groups of sealing airbags (16) are respectively connected to the hydraulic control part 1 (13) and the hydraulic control part 2 (14). When the plunger (4) moves to inhale, the hydraulic control part 2 (14) inside the inlet ball valve component (7) controls the corresponding sealing airbag (16) to contract, and the inlet is fully opened as the inlet ball valve component (7) moves. When the plunger (4) moves and compresses, the hydraulic control part 1 (13) inside the outlet ball valve component (6) controls the corresponding sealing airbag (16) to contract, and the outlet is fully opened as the outlet ball valve component (6) moves.

2. The liquid variable displacement pump with leak-proof function according to claim 1, characterized in that: The top and bottom of the connecting tube (3) are the outlet end and the inlet end respectively. The bottom of the connecting tube (3) is detachably provided with a filter sleeve (8). The side of the connecting tube (3) is provided with an intermediate cavity (9), and the interior of the connecting tube (3) is provided with an assembly cavity (10). The outlet ball valve component (6) and the inlet ball valve component (7) are arranged in the assembly cavity (10) of the connecting tube (3) from top to bottom.

3. The liquid variable displacement pump with leak-proof function according to claim 2, characterized in that: The outlet ball valve component (6) includes a ball valve (61), a spring (62) and a connecting ring (63). The ball valve (61) is located in the assembly cavity (10). One end of the spring (62) is fixed in the assembly cavity (10), and the other end is fixedly connected to the connecting ring (63). The connecting ring (63) is fixed on the outside of the ball valve (61). The inlet ball valve component (7) includes a ball valve (71), a spring (72), a connecting ring (73) and a positioning frame (74). The spring (72) is fixedly connected between the positioning frame (74) and the connecting ring (73). The connecting ring (73) is fixed on the outside of the ball valve (71). The positioning frame (74) is fixed in the intermediate cavity (9).

4. The liquid variable displacement pump with leak-proof function according to claim 3, characterized in that: The sealing seat (15) comprises an annular seat (151) and an annular protrusion (152). The annular seat (151) is fixedly sleeved in the assembly cavity (10). The annular protrusion (152) is arranged on the annular inner wall of the annular seat (151). The outer side surface of the annular seat (151) is provided with a sealing annular surface 1 (153). The outer side surface of the annular protrusion (152) is provided with a sealing annular surface 2 (154).

5. The liquid variable displacement pump with leak-proof function according to claim 4, characterized in that: The annular grooves (17) are respectively formed on the outer sides of the first ball valve (61) and the second ball valve (71). The annular grooves (17) correspond to and are connected to the sealing airbags (16). When the sealing airbags (16) are expanded, they are nested in the side surfaces of the annular protrusions (152).

6. The liquid variable displacement pump with leak-proof function according to claim 5, characterized in that: The hydraulic control unit (13) includes a through hole (131), a connecting slide cavity (132), a piston plate (133), a spring (134) and a piston frame (135). The connecting slide cavity (132) and the through hole (131) are both opened inside the ball valve (61), and the two ends of the connecting slide cavity (132) are respectively connected to the through hole (131) and the ring groove (17). The piston plate (133) is fixedly connected to the spring (134) and elastically connected to the through hole (131) through the spring (134). One end of the piston frame (135) is movably sleeved in the connecting slide cavity (132), and the other end is fixedly connected to the piston plate (133). When the piston plate (133) is compressed, the sealing airbag (16) is expanded.

7. The liquid variable displacement pump with leak-proof function according to claim 5, characterized in that: The hydraulic control unit 2 (14) includes a through hole 2 (141), a conducting cavity (142), a piston plate 2 (143) and a spring 4 (144). The through hole 2 (141) and the conducting cavity (142) are both provided inside the ball valve 2 (71). The two ends of the conducting cavity (142) are respectively connected to the through hole 2 (141) and the annular groove (17). The piston plate 2 (143) is fixedly connected to the spring 4 (144) and elastically connected to the inside of the through hole 2 (141) through the spring 4 (144). When the piston plate 2 (143) is compressed, the sealing airbag (16) expands.

8. The liquid variable displacement pump with leak-proof function according to claim 3, characterized in that: An impact column (12) is fixedly provided at one end of the inlet ball valve member (7). The impact column (12) is fixed on the second ball valve (71) and moves along with the second ball valve (71). When the impact column (12) follows the second ball valve (71) to seal with the sealing assembly, it impacts the filter sleeve (8).

9. The liquid variable displacement pump with leak-proof function according to claim 7, characterized in that: One end of the second hydraulic control part (14) is fixedly connected to a linkage component (18), and an intermittent magnetic attraction part (19) is provided inside the intermediate cavity (9). When the cylinder sleeve (1) is sucked in by the linkage component (18), the intermittent magnetic attraction part (19) generates local magnetism, and when the cylinder sleeve (1) is pressed out by the linkage component (18), the local magnetism of the intermittent magnetic attraction part (19) disappears.

10. The liquid variable displacement pump with leak-proof function according to claim 9, characterized in that: The linkage assembly (18) includes a connecting rod (181), a fixed plate (182) and a connecting curved plate (183), one end of the connecting rod (181) is fixed on the piston plate 2 (143), the fixed plate (182) is fixedly connected to the outer end of the connecting rod (181), the connecting rod (181) and the connecting curved plate (183) are fixedly connected, the intermittent magnetic attraction portion (19) includes a metal rod (191), a permanent magnet (192), a connecting column (193) and a spring five (194), an adapting cavity (11) is provided inside the connecting cylinder (3), the metal rod (191) is fixed inside the connecting cylinder (3), the spring five (194) is fixedly connected between the connecting column (193) and the permanent magnet (192), the connecting curved plate (183) is fixedly connected to the connecting column (193) and controls the lateral movement of the connecting column (193), and the connecting column (193) is located in the adapting cavity (11).

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