WO2021128685A1 - 一种压力泵泵头及压力泵 - Google Patents

一种压力泵泵头及压力泵 Download PDF

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Publication number
WO2021128685A1
WO2021128685A1 PCT/CN2020/088315 CN2020088315W WO2021128685A1 WO 2021128685 A1 WO2021128685 A1 WO 2021128685A1 CN 2020088315 W CN2020088315 W CN 2020088315W WO 2021128685 A1 WO2021128685 A1 WO 2021128685A1
Authority
WO
WIPO (PCT)
Prior art keywords
chamber
pressure pump
piston
pump head
cylinder
Prior art date
Application number
PCT/CN2020/088315
Other languages
English (en)
French (fr)
Inventor
金鸿雁
刘辉
庞金伟
冷德嵘
李常青
奚杰峰
李宁
刘春俊
唐志
韦建宇
Original Assignee
南微医学科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 南微医学科技股份有限公司 filed Critical 南微医学科技股份有限公司
Priority to DE212020000797.7U priority Critical patent/DE212020000797U1/de
Publication of WO2021128685A1 publication Critical patent/WO2021128685A1/zh
Priority to US17/842,696 priority patent/US20220316471A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A61M5/14212—Pumping with an aspiration and an expulsion action
    • A61M5/14216—Reciprocating piston type
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/1413—Modular systems comprising interconnecting elements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
    • A61M5/1452—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons
    • A61M5/14566—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons with a replaceable reservoir for receiving a piston rod of the pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F04B53/143—Sealing provided on the piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/12—General characteristics of the apparatus with interchangeable cassettes forming partially or totally the fluid circuit
    • A61M2205/123—General characteristics of the apparatus with interchangeable cassettes forming partially or totally the fluid circuit with incorporated reservoirs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
    • A61M39/22—Valves or arrangement of valves
    • A61M39/24—Check- or non-return valves

Definitions

  • This application relates to the technical field of medical devices, and specifically to a pressure pump head and a pressure pump.
  • a pressure pump is required for injection.
  • a pressure pump is required to achieve endoscopic submucosal injection bulge.
  • the sealing effect at the piston in the pressure pump is particularly important.
  • the problem of poor sealing effect at the piston often occurs, which affects the precise control of the infusion process and increases the risk of surgery.
  • the purpose of the present application includes, for example, to provide a pressure pump head, which can improve the phenomenon of poor sealing effect at the piston.
  • the object of the present application also includes providing a pressure pump including the above-mentioned pressure pump head.
  • the embodiment of the present application provides a pressure pump head, which includes a cylinder, the cylinder has a first chamber, an active chamber, and a second chamber that are connected in sequence; the cylinder has a first chamber, a movable chamber, and a second chamber.
  • the movable chamber is configured to be sealed to cooperate with the piston; one end of the first chamber away from the movable chamber has a first opening configured for the piston to enter, and the first chamber is configured to be in contact with the piston. Piston clearance fit.
  • the cylinder has a third inner wall corresponding to the movable chamber; a first guide surface is further provided between the first inner wall and the third inner wall, and the first guide surface is configured to The piston is guided to extend from the first chamber into the movable chamber.
  • the distance from the first guide surface to the axis of the movable chamber gradually decreases.
  • the first guide surface includes a tapered surface, and the tapered angle of the tapered surface is ⁇ , 30° ⁇ 150°.
  • both ends of the first guide surface are connected to the first inner wall and the third inner wall, respectively.
  • the first chamber and the movable chamber are both cylindrical, the corresponding radial dimension of the first chamber is r1, and the corresponding radial dimension of the movable chamber is r2, 0.2mm ⁇ (r1-r2).
  • the second chamber is configured to be in clearance fit with the piston.
  • the pressure pump head further includes a first sealing structure disposed at the first opening, and the first sealing structure is connected with the cylinder to close the first opening.
  • the first sealing structure includes a first connecting member and a first sealing member connected to the first connecting member; the first sealing member is located in the first chamber to close the first Opening; the first connecting piece is fixedly connected to the cylinder.
  • the pressure pump head further includes a fastener, a first connecting hole is provided on the cylinder, a second connecting hole is provided on the first connecting piece, and the fastener is simultaneously connected to the The first connecting hole and the second connecting hole cooperate to fix the first connecting member to the cylinder.
  • the number of the first connecting hole, the second connecting hole, and the fastener are multiple, and the first connecting hole, the second connecting hole, and the fastener One-to-one correspondence is provided, and a plurality of the first connecting holes are evenly distributed around the circumference of the first opening.
  • the cylinder further has a second opening communicating with the second chamber
  • the pressure pump head further includes a second sealing structure provided at the second opening; the second sealing The structure is connected with the cylinder to close the second opening.
  • the pressure pump head further includes a first one-way valve, a second one-way valve, a third one-way valve, and a fourth one-way valve;
  • the first check valve is installed at the first liquid inlet
  • the second check valve is installed at the first liquid outlet
  • the third check valve is installed at the second liquid inlet
  • the fourth one-way valve is installed at the second liquid outlet.
  • the embodiment of the application also provides a pressure pump.
  • the pressure pump includes any of the above-mentioned pressure pump heads.
  • the embodiment of the present application provides a pressure pump head, which includes a cylinder.
  • the cylinder has a first chamber, an active chamber, and a second chamber that are connected in sequence.
  • the cylinder also has a first inner wall corresponding to the first chamber and a second inner wall corresponding to the second chamber.
  • the first inner wall is provided with a first liquid inlet and a first liquid outlet
  • the second inner wall is provided with a second liquid inlet and a second liquid outlet.
  • the movable chamber is configured to be sealed and matched with the piston. When in use, the piston slides in the movable chamber to change the volume of the space on both sides of the piston.
  • the end of the first chamber away from the movable chamber has a first opening configured for the piston to enter.
  • the piston When installed, the piston enters the first chamber through the first opening, and enters the movable chamber after passing through the first chamber.
  • the chamber is set to be in clearance fit with the piston, so the size of the first chamber is larger than the piston, so as to avoid the piston from being affected by the first liquid inlet and the first liquid outlet when the piston passes through the first chamber.
  • the impact of the burr prevents the burr from damaging the piston, thereby avoiding the problem of affecting the sealing performance of the piston.
  • the sealing performance of the piston is guaranteed and the sealing effect is good.
  • the embodiment of the present application also provides a pressure pump, which includes the above-mentioned pressure pump head. Since the pressure pump includes the above-mentioned pressure pump head, it also has the beneficial effects of continuous liquid supply, the sealing performance of the piston is guaranteed, and the sealing effect is good.
  • FIG. 1 is a schematic cross-sectional structure diagram of a pump head of a pressure pump provided by an embodiment of the application from a first perspective;
  • FIG. 2 is a schematic diagram of a cross-sectional structure of a cylinder in a pump head of a pressure pump according to an embodiment of the application;
  • Figure 3 is an enlarged schematic diagram of the partial structure at III in Figure 2;
  • Figure 4 is an enlarged schematic diagram of the partial structure at IV in Figure 1;
  • FIG. 5 is a schematic structural diagram of another first guide surface in the pump head of the pressure pump provided by an embodiment of the application;
  • Fig. 6 is an enlarged schematic diagram of the partial structure at VI in Fig. 1;
  • Fig. 7 is an enlarged schematic diagram of the partial structure at VII in Fig. 1;
  • FIG. 8 is a schematic diagram of the structure of the cylinder in the pump head of the pressure pump provided by an embodiment of the application;
  • FIG. 9 is a schematic diagram of the structure of the cover in the pump head of the pressure pump provided by the embodiment of the application.
  • Fig. 10 is a schematic cross-sectional structure view of a pressure pump head provided by an embodiment of the application from a second perspective.
  • Icon 10-pressure pump head; 100-cylinder; 110-working chamber; 111-first chamber; 112-active chamber; 113-second chamber; 114-first inner wall; 115-second inner wall 116-third inner wall; 117-first guide surface; 1171-cone surface; 1172-arc surface; 118-second guide surface; 121-first liquid inlet; 122-first liquid outlet; 123- Second liquid inlet; 124-second liquid outlet; 125-first opening; 126-second opening; 131-first connecting hole; 132-clamping groove; 133-third opening; 134-first installation Hole; 210-first sealing structure; 211-first sealing member; 212-first connecting member; 213-second connecting hole; 220-second sealing structure; 221-second sealing member; 222-second connecting member 230-fasteners; 300-piston structure; 310-piston rod; 320-piston; 321-piston body; 322-rubber ring; 400-cover body; 411-liquid inlet channel;
  • FIG. 1 is a schematic cross-sectional structure diagram of a pressure pump pump head 10 provided by this embodiment from a first perspective
  • FIG. 2 is a schematic cross-sectional structure diagram of a cylinder 100 in the pressure pump pump head 10 provided by this embodiment. Please refer to FIG. 1 and FIG. 2 in combination.
  • This embodiment provides a pressure pump head 10, and correspondingly, a pressure pump (not shown) is provided.
  • the pressure pump head 10 includes a cylinder 100.
  • the cylinder 100 has a first chamber 111, an active chamber 112, and a second chamber 113 that are connected in sequence.
  • the cylinder 100 also has a first inner wall 114 corresponding to the first cavity 111 and a second inner wall 115 corresponding to the second cavity 113.
  • the first inner wall 114 is provided with a first liquid inlet 121 and a first liquid outlet 122
  • the second inner wall 115 is provided with a second liquid inlet 123 and a second liquid outlet 124.
  • the movable chamber 112 is configured to cooperate with the piston 320 in a sealed manner. When in use, the piston 320 slides in the movable chamber 112 to change the volume of the space on both sides of the piston 320.
  • One end of the first chamber 111 away from the movable chamber 112 has a first opening 125 configured for the piston 320 to enter.
  • the piston 320 enters the first chamber 111 through the first opening 125, and after passing through the first chamber 111 Into the active chamber 112, and the first chamber 111 is set to be in clearance fit with the piston 320, so the size of the first chamber 111 is larger than that of the piston 320, so as to prevent the piston 320 from being damaged during the process of passing through the first chamber 111.
  • the effect of the burr formed by the first liquid inlet 121 and the first liquid outlet 122 is to prevent the burr from damaging the piston 320, thereby avoiding the problem of affecting the sealing performance of the piston 320, the sealing performance of the piston 320 is guaranteed, and the sealing effect is good .
  • the pressure pump includes the above-mentioned pressure pump pump head 10, and the pressure pump also includes a liquid inlet pipe (not shown in the figure) and a liquid outlet pipe (not shown in the figure).
  • the liquid inlet pipe is connected to the first liquid inlet 121 and the second inlet.
  • the liquid ports 123 are all connected, so as to supply liquid to the first chamber 111 and the second chamber 113 with the movement of the piston 320; the liquid outlet pipe is in communication with the first liquid outlet 122 and the second liquid outlet 124, so as to follow the piston
  • the movement of 320 outputs the liquid in the first chamber 111 and the second chamber 113. Since the first chamber 111 and the second chamber 113 alternately discharge liquid, continuous liquid discharge from the liquid outlet pipe is realized.
  • the pressure pump pump head 10 includes a cylinder 100 and a piston 320.
  • the cylinder 100 has a working chamber 110.
  • the piston 320 and the working chamber 110 are slidably fitted, thereby connecting the working chamber 110 is divided into two independent sub-chambers, the two sub-chambers are the first sub-chamber and the second sub-chamber, and the volume of the first sub-chamber and the second sub-chamber is changed by the sliding of the piston 320 .
  • the working chamber 110 includes a first chamber 111, an active chamber 112, and a second chamber 113 connected in sequence.
  • the cylinder 100 has a first inner wall 114 corresponding to the first chamber 111 and a second chamber corresponding to the The second inner wall 115 of 113 and the third inner wall 116 corresponding to the active cavity 112.
  • the piston 320 can be slidably fitted with the movable chamber 112, and the piston 320 is in sealed contact with the third inner wall 116.
  • the first sub-chamber formed by the piston 320 is divided by the first chamber 111 and the movable chamber 112.
  • the movable chamber 112 is formed at the side of the piston 320 close to the first chamber 111, and the second sub-chamber is formed by the second chamber 113 and the part of the moving chamber 112 at the side of the piston 320 close to the second chamber 113.
  • the first inner wall 114 is provided with a first liquid inlet 121 and a first liquid outlet 122.
  • the piston 320 always slides back and forth in the movable chamber 112, so the first liquid inlet 121 and the first liquid outlet
  • the port 122 is always in communication with the first sub-chamber;
  • the second inner wall 115 is provided with a second liquid inlet 123 and a second liquid outlet 124.
  • the piston 320 always slides back and forth in the movable chamber 112, so The second liquid inlet 123 and the second liquid outlet 124 are always in communication with the second sub-chamber.
  • the volume of the first sub-chamber becomes smaller, the fluid in the first sub-chamber is squeezed out of the first liquid outlet 122, and the second sub-chamber The volume becomes larger, which causes the pressure in the second sub-chamber to decrease.
  • the fluid in the second liquid inlet 123 flows into the second sub-chamber under pressure; when the piston 320 moves toward the second chamber 113, The volume of the second sub-chamber becomes smaller, the fluid in the second sub-chamber is squeezed and flows out from the second liquid outlet 124, and the volume of the first sub-chamber becomes larger, resulting in a decrease in the pressure in the first sub-chamber.
  • the fluid in the first liquid inlet 121 flows into the first sub-chamber under pressure.
  • the first chamber 111, the movable chamber 112, and the second chamber 113 are cylindrical, respectively, and the first chamber 111, the movable chamber 112, and the second chamber 113 are coaxially arranged.
  • the shapes and relative positions of the first chamber 111, the movable chamber 112, and the second chamber 113 are not limited here. It should be understood that in other embodiments, it can also be specified according to the needs of the user.
  • the shape and relative positional relationship of the respective chambers are set, for example, the first chamber 111 is set in a square shape, or the second chamber 113 is set eccentrically with respect to the movable chamber 112.
  • One end of the first chamber 111 away from the movable chamber 112 has a first opening 125.
  • the piston 320 enters the first chamber 111 from the first opening 125, passes through the first chamber 111 and then enters the movable chamber 112, and then It is sealed and matched with the movable chamber 112.
  • the first cavity 111 and the piston 320 are in clearance fit, that is, the radial dimension r1 corresponding to the first cavity 111 is larger than the radial dimension r2 corresponding to the movable cavity 112.
  • the radial dimension is the radius dimension of the corresponding cylindrical shape.
  • 0.2mm ⁇ (r1-r2), optionally, (r1-r2) 0.2mm, 0.5mm or 0.8mm, etc.
  • the difference between r1 and r2 can be specifically set to other values according to requirements, to ensure that r1 is greater than r2, and the piston 320 will not be damaged due to burrs during installation and affect the sealing effect. That's it.
  • Fig. 3 is an enlarged schematic diagram of the partial structure at III in Fig. 2.
  • the cylinder 100 further has a first guide surface 117 disposed between the first inner wall 114 and the third inner wall 116, and the first guide surface 117 is configured to guide the piston 320 Extend from the first cavity 111 into the movable cavity 112, specifically, along the direction of the first cavity 111 pointing to the movable cavity 112 (ie the left and right directions as shown in FIG. 2), the first guide surface 117 reaches the movable cavity The distance of the axis of the chamber 112 gradually decreases. The installation of the piston 320 is guided by the first guide surface 117, so that the installation of the piston 320 is more convenient and the damage to the piston 320 is reduced.
  • Fig. 4 is an enlarged schematic diagram of the partial structure at IV in Fig. 1.
  • the pressure pump head 10 further includes a piston structure 300.
  • the piston structure 300 includes a piston rod 310 and a piston 320 connected to the piston rod 310.
  • the piston 320 includes a piston body 321 and a rubber ring 322 installed on the piston body 321.
  • the piston body 321 has a radially outwardly protruding structure formed by the peripheral surface located in the middle of the piston rod 310, and the piston body 321 has a sealing groove, and the rubber ring 322 is clamped in the sealing groove to be connected with the piston body 321 At the same time, the outer end of the rubber ring 322 protrudes from the peripheral surface of the piston body 321. It can be understood that, in other embodiments, the fixing rubber ring 322 and the piston body 321 can also be bonded in other ways, such as gluing.
  • the rubber ring 322 is squeezed and deformed by the third inner wall 116 to seal and fit with the third inner wall 116 to realize the sealing fit between the piston 320 and the movable chamber 112.
  • One end of the piston rod 310 extends from the first chamber 111
  • the piston rod 310 is connected to a power structure (not shown in the figure) outside the cylinder 100.
  • the power structure drives the piston rod 310 to reciprocate along its own axis, thereby driving the piston 320 to slide back and forth relative to the third inner wall 116.
  • the pumping of fluid is not shown in the figure.
  • the first guide surface 117 guides the piston 320 to be installed into the movable chamber 112, thereby guiding the rubber ring 322 to gradually deform during the installation process, which not only reduces the difficulty of installation, but also reduces the damage to the rubber ring 322.
  • the first guide surface 117 is a conical surface.
  • the first guide surface 117 is The radial dimension is gradually reduced. Therefore, when the piston 320 moves into the movable chamber 112 through the first guide surface 117, the rubber ring 322 is squeezed by the first guide surface 117 and gradually deforms until it deforms to the first inner wall 114. After matching, it enters the active chamber 112 smoothly.
  • the specific shape of the first guide surface 117 is not limited here. It is understandable that in other embodiments, the first guide surface 117 can also be specifically set according to requirements, for example, the first guide surface 117 is set as The arc surface may be formed by the combination of the arc surface 1172 and the tapered surface 1171 (as shown in FIG. 5). Along the direction from the first chamber 111 to the movable chamber 112, the first guide surface 117 to the working chamber 110 The distance between the axis (that is, the axis of the movable chamber 112) gradually decreases to be able to guide the piston 320 into the movable chamber 112. It should also be noted that the first guide surface 117 shown in FIG.
  • the first guide surface 117 may also be configured to include a tapered surface 1171 and a circular arc surface 1172.
  • the circular arc surface 1172 is located between the tapered surface 1171 and the first inner wall 114 or the circular arc surface 1172 is located between the tapered surface 1171 and the first inner wall 114.
  • Between the third inner walls 116, or the first guide surface is set to include two arc surfaces 1172, and the centers of the two arc surfaces 1172 are located on both sides of the first guide surface.
  • both ends of the first guide surface 117 are respectively connected to the first inner wall 114 and the third inner wall 116, and along the direction from the first chamber 111 to the movable chamber 112, the first inner wall 114, the first guide surface 117 and the second
  • the three inner walls 116 are connected in sequence, the radial size of the large end of the first guiding surface 117 is the same as the radial size of the first inner wall 114, and the radial size of the small end of the first guiding surface 117 is the same as the radial size of the third inner wall 116.
  • the first guide surface 117 is arranged at the junction of the first inner wall 114 and the third inner wall 116, and the arrangement of the first guide surface 117 is more convenient.
  • the position of the first guide surface 117 can also be set according to requirements.
  • the first guide surface 117 is set to protrude from the end of the third inner wall 116 close to the first inner wall 114 and to the third inner wall.
  • the inner wall 116 is close to the surface.
  • the second chamber 113 is also in clearance fit with the piston 320.
  • the chamber 113 has the same volume as the first chamber 111, which in turn helps to accurately control the injection.
  • the cylinder 100 also has a second guide surface 118 arranged between the second inner wall 115 and the third inner wall 116.
  • the second guide surface 118 has the same shape and size as the first guide surface 117, and the second guide surface 118 corresponds to the size of the space between the second cavity 113 and the movable cavity 112 and the first guide surface 117.
  • the correspondingly formed space between the first cavity 111 and the movable cavity 112 has the same size.
  • the cylinder 100 further has a second opening 126 communicating with the second chamber 113, and the second opening 126 is located at an end of the second chamber 113 away from the movable chamber 112. Due to the opening of the second opening 126, when the piston 320 is installed, the piston 320 can also be inserted into the second chamber 113 from the second opening 126. After passing through the second chamber 113, the piston 320 can be installed on the second guide surface 118. The installation of the piston 320 is easier and easier to install under the guidance of the movable chamber 112.
  • Fig. 6 is an enlarged schematic diagram of the partial structure at VI in Fig. 1. 1 and 6 in combination, in this embodiment, the pressure pump pump head 10 further includes a first sealing structure 210 disposed at the first opening 125, the first sealing structure 210 is connected with the cylinder 100 to close the first Opening 125, so as to prevent fluid from leaking from the first opening 125 during operation.
  • the first sealing structure 210 includes a first connecting member 212 and a first sealing member 211 connected to the first connecting member 212.
  • the first connecting member 212 is fixedly connected to the cylinder block 100 so as to fix the first sealing structure 210 to the cylinder block 100.
  • the first sealing member 211 is located in the first chamber 111 and is in sealing engagement with the first inner wall 114, thereby closing the first opening 125. By arranging the first sealing member 211 in the first chamber 111, it passes through the first chamber 111 at the same time.
  • the sealing member 211 and the first inner wall 114 are matched with each other to achieve sealing, which helps to improve the sealing effect.
  • the pressure pump head 10 further includes a fastener 230.
  • the cylinder 100 is provided with a first connecting hole 131, and the first connecting member 212 is opened with a second connecting hole 213.
  • the fastener 230 is matched with the first connecting hole 131 and the second connecting hole 213 at the same time, so as to fix the first connecting member 212 to the cylinder 100.
  • the fastener 230 is a screw, and the first connecting hole 131 is a threaded hole. The screw passes through the second connecting hole 213 and then is screwed to the first connecting hole 131, thereby realizing the fixation of the first connecting member 212 and the cylinder 100 connection.
  • other types of fasteners 230 may be used to fix the first connecting member 212 to the cylinder 100, such as pins.
  • connection manner of the first connecting member 212 and the cylinder 100 is not limited here. It is understood that in other embodiments, other methods may be selected to fix the first connecting member 212 to the cylinder according to requirements. 100, such as gluing, clamping, etc., can ensure the reliability of the connection between the first connecting member 212 and the cylinder 100.
  • the number of the first connecting hole 131, the second connecting hole 213, and the fastener 230 are multiple, and the first connecting hole 131, the second connecting hole 213, and the fastener 230 are arranged in one-to-one correspondence. That is, each first connecting hole 131 corresponds to a second connecting hole 213, and one of the fasteners 230 is matched with the first connecting hole 131 and the second connecting hole 213, and the fastener 230 is tightened.
  • the solid effect makes the connection between the first connecting member 212 and the cylinder 100 more reliable.
  • the plurality of first connecting holes 131 are evenly distributed along the circumferential direction of the first opening 125.
  • the number of the first connecting holes 131 is four.
  • the number of the second connecting holes 213 and the fastener 230 is also four. It is understood that in other embodiments, it may be specific according to requirements.
  • the number of the first connecting hole 131, the second connecting hole 213, and the fastener 230 is set, for example, the number of the first connecting hole 131, the second connecting hole 213, and the fastener 230 is set to three or six.
  • the first sealing structure 210 also has a through hole for the piston rod 310 to pass through. Specifically, the through hole passes through the first connecting member 212 and the first sealing member 211. After installation, the piston rod 310 passes through the through hole. The first chamber 111 is penetrated to connect with the power structure outside the cylinder 100, and then reciprocate under the drive of the power structure. The first seal 211 and the piston rod 310 are hermetically matched, so as to prevent the fluid in the cylinder 100 from leaking from the through hole, and the pressure pump head 10 has a better sealing effect.
  • Fig. 7 is an enlarged schematic diagram of the partial structure at VII in Fig. 1. 1 and 6 in combination, in this embodiment, the pressure pump head 10 further includes a second sealing structure 220 disposed at the second opening 126, the second sealing structure 220 is connected with the cylinder 100 to close the second The opening 126 prevents the fluid in the cylinder 100 from leaking from the second opening 126.
  • the second sealing structure 220 is the same as the first sealing structure 210.
  • the second sealing structure 220 includes a second connecting member 222 and a second sealing member 221 connected to the second connecting member 222.
  • the second connecting member 222 is fixedly connected to the cylinder block 100, so as to realize the fixation of the second sealing structure 220 and the cylinder block 100.
  • the second sealing member 221 is located in the second chamber 113 and is in sealing engagement with the second inner wall 115, thereby sealing the second opening 126, and the sealing effect is good. Furthermore, the second connecting member 222 and the cylinder 100 are fixed by a fastener 230.
  • the specific structure of the second sealing structure 220 is not limited here. It is understandable that in other embodiments, other structures can also be used to seal the second opening 126 as required to ensure the sealing effect. .
  • FIG. 8 is a schematic structural diagram of the cylinder 100 in the pressure pump pump head 10 provided by this embodiment
  • FIG. 9 is a structural schematic diagram of the cover 400 in the pressure pump pump head 10 provided by this embodiment
  • FIG. 10 is provided by this embodiment
  • the pressure pump head 10 further includes a cover 400 connected below the cylinder 100.
  • the cover 400 has a liquid inlet channel 411 and a liquid outlet channel 412.
  • the liquid inlet channel 411 communicates with the first liquid inlet 121 and the second liquid inlet 123, and the liquid outlet The channel 412 is in communication with the first liquid outlet 122 and the second liquid outlet 124.
  • the liquid inlet pipe of the pressure pump communicates with the liquid inlet channel 411, which is the first sub-chamber and the second sub-chamber with the movement of the piston 320.
  • the chamber supplies fluid, and the outlet pipe of the pressure pump communicates with the outlet channel 412. With the movement of the piston 320, the fluid in the first sub-chamber and the second sub-chamber alternately enters the outlet channel 412 and passes through the outlet channel 412 412 enters the liquid outlet pipe to realize continuous liquid supply.
  • the cylinder body 100 is provided with a clamping groove 132
  • the cover 400 is provided with a clamping protrusion 413 that is engaged with the clamping groove 132.
  • the clamping protrusion 413 and the clamping groove 132 are connected to each other.
  • the cylinder 100 and the cover 400 are connected and fixed.
  • the clamping groove 132 is opened on the lower side of the cylinder body 100, and at the same time, the side wall of the clamping groove 132 is provided with an opening that cooperates with the buckle protrusion 413, and the opening is the third opening 133.
  • the three openings 133 are arranged through the side wall of the cylinder body 100.
  • the buckle protrusion 413 extends from the lower end of the cylinder body 100 into the clamping groove 132, and opens and closes at the third opening 133, thereby realizing the connection between the cylinder body 100 and The cover 400 is locked and fixed.
  • the number of the locking grooves 132 and the locking protrusions 413 are both multiple, and the locking grooves 132 and the locking protrusions 413 are connected in one-to-one correspondence, and the plurality of locking grooves 132 are connected to the multiple locking protrusions.
  • the snap connection of 413 makes the connection and positioning of the cylinder 100 and the cover 400 more reliable.
  • the number of the buckle protrusions 413 is six, and the six buckle protrusions 413 are arranged in an array.
  • the number of the locking grooves 132 is six, and the positions are corresponding to the locking protrusions 413.
  • the number of buckle protrusions 413 and the number of buckle grooves 132 can also be specifically set according to the needs of users.
  • the numbers of buckle protrusions 413 and the number of buckle grooves 132 are both set to four. One or eight etc.
  • the pressure pump head 10 further includes a one-way valve, specifically, the number of one-way valves is four, and the four one-way valves are the first one-way valve 511, the second one-way valve 512, and the third one-way valve respectively.
  • the first one-way valve 511 is arranged corresponding to the first liquid inlet 121, so that the fluid at the first liquid inlet 121 flows in one direction from the liquid inlet channel 411 to the first chamber 111; the second one-way valve 512 is set corresponding to the first liquid outlet 122, so that the circulation at the first liquid outlet 122 flows in one direction from the first chamber 111 to the liquid outlet channel 412; the third one-way valve corresponds to the second inlet
  • the liquid port 123 is arranged so that the fluid at the second liquid inlet 123 flows unidirectionally from the liquid inlet channel 411 to the second chamber 113; the fourth one-way valve is arranged corresponding to the second liquid outlet 124 to The fluid at the second liquid outlet 124 flows unidirectionally in the direction from the second chamber 113 to the liquid outlet channel 412.
  • the cylinder 100 is provided with first mounting holes 134, the number of the first mounting holes 134 is four, and the four first mounting holes 134 respectively correspond to the first liquid inlet 121, the first liquid outlet 122, The second liquid inlet 123 and the second liquid outlet 124 are connected and arranged;
  • the cover 400 is provided with a second mounting hole 414, the number of the second mounting hole 414 is four, and the four second mounting holes 414 are connected to the four
  • the first mounting holes 134 are correspondingly arranged, and two of the four mounting holes are communicated with the liquid inlet channel 411, and the other two are communicated with the liquid outlet channel 412.
  • the first mounting hole 134 communicates with the second mounting hole 414 to form an accommodating space configured to install the one-way valve.
  • the working principle of the pressure pump pump head 10 is as follows:
  • the piston 320 enters the first chamber 111 through the first opening 125, and then enters the movable chamber 112 under the guidance of the first guide surface 117, and seals and cooperates with the movable chamber 112, thereby closing the cylinder 100
  • the working chamber 110 is divided into two independent sub-chambers. Since the first inner wall 114 corresponding to the first cavity 111 is injection-molded or punched to form a first liquid inlet 121 and a second liquid inlet 123, the first liquid inlet 121 and the second liquid inlet 123 are Burrs may occur.
  • the piston 320 By setting the first chamber 111 to be in clearance fit with the piston 320, the piston 320 is prevented from contacting the burrs when passing through the first chamber 111 and into the movable chamber 112, which prevents the burrs from damaging the rubber of the piston 320. Ring 322, thereby avoiding the problem of causing damage to the rubber ring 322 and affecting the sealing effect.
  • the piston 320 reciprocates under the drive of the power structure to change the volume of the first sub-chamber and the second sub-chamber.
  • the piston 320 moves in a direction close to the first chamber 111, the volume of the first sub-chamber becomes smaller, and the fluid in the first sub-chamber is squeezed through the first liquid outlet 122 into the liquid outlet channel 412, thereby performing Infusion; the volume of the second sub-chamber becomes larger, and the fluid in the liquid inlet channel 411 enters the second sub-chamber through the second liquid inlet 123.
  • the pressure pump head 10 provided in this embodiment has at least the following advantages:
  • the embodiment of the present application provides a pressure pump head 10, which opens a first liquid inlet 121 and a first liquid outlet 122 communicating with a first sub-chamber, and a second liquid outlet 122 communicating with a second sub-chamber.
  • the liquid inlet 123 and the second liquid outlet 124 realize the continuous infusion of the pressure pump, and the use effect is good.
  • the first liquid inlet 121 and the first liquid outlet 122 are opened at the first inner wall 114 corresponding to the first chamber 111, and the first chamber 111 is set to be in clearance fit with the piston 320, thereby avoiding The burr damages the piston 320 during the installation process, thereby avoiding problems affecting the sealing performance of the piston 320, and the sealing effect is better.
  • This embodiment also provides a pressure pump, which includes the above-mentioned pressure pump head 10. Since the pressure pump includes the above-mentioned pressure pump head 10, it also has the beneficial effects of continuous infusion, good sealing performance of the piston 320, and more precise control of the infusion process.

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Abstract

提供一种压力泵泵头（10）及压力泵。其中压力泵泵头（10）包括缸体（100），缸体（100）具有依次连通的第一腔室（111）、活动腔室（112）和第二腔室（113）；活动腔室（112）用于与活塞（320）密封配合。第一腔室（111）远离活动腔室（112）的一端具有用于供活塞（320）进入的第一开口（125），安装时，活塞（320）通过第一开口（125）进入第一腔室（111），穿过第一腔室（111）后进入活动腔室（112），同时第一腔室（111）设置为与活塞（320）间隙配合，因此第一腔室（111）的尺寸大于活塞（320），从而避免在活塞（320）穿过第一腔室（111）的过程中，受到由于设置第一进液口（121）和第一出液口（122）所形成的毛刺影响，进而也就避免了毛刺损伤活塞、影响活塞密封性能的问题，活塞的密封性能得到保证，密封效果得到提高。

Description

一种压力泵泵头及压力泵
相关申请的交叉引用
本申请要求于2019年12月27日提交中国专利局的申请号为CN201911377484.0、名称为“一种压力泵泵头及压力泵”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及医疗器械技术领域，具体而言，涉及一种压力泵泵头及压力泵。
背景技术
在一些临床手术过程中，需要使用压力泵进行注射，例如在粘膜下切除术中，需要通过压力泵实现内镜粘膜下注射隆起。
而在压力泵的泵进过程中，为了确保输注过程的精确控制，压力泵中活塞处的密封效果尤为重要。然而目前的压力泵中安装活塞后，往往会出现活塞处密封效果差的问题，进而对输注过程的精确控制造成影响，增加手术风险。
发明内容
本申请的目的包括，例如，提供了一种压力泵泵头，其能够改善活塞处出现密封效果差的现象。
本申请的目的还包括，提供了一种压力泵，该压力泵包括上述的压力泵泵头。
本申请的实施例可以这样实现：
本申请的实施例提供了一种压力泵泵头，其包括缸体，所述缸体具有依次连通的第一腔室、活动腔室以及第二腔室；所述缸体具有与所述第一腔室对应的第一内壁和与所述第二腔室对应的第二内壁；所述第一内壁上开设有第一进液口和第一出液口，所述第二内壁上开设有第二进液口和第二出液口；
所述活动腔室配置成与活塞密封配合；所述第一腔室远离所述活动腔室的一端具有配置成供所述活塞进入的第一开口，所述第一腔室配置成与所述活塞间隙配合。
可选地，所述缸体具有与所述活动腔室对应的第三内壁；所述第一内壁和所述第三内壁之间还设置有第一引导面，所述第一引导面配置成引导所述活塞从所述第一腔室伸入所 述活动腔室内。
可选地，沿所述第一腔室指向所述活动腔室的方向，所述第一引导面至所述活动腔室的轴线的距离逐渐减小。
可选地，所述第一引导面包括锥面，所述锥面的锥角为α，30°≤α≤150°。
可选地，所述第一引导面的两端分别与所述第一内壁和所述第三内壁连接。
可选地，所述第一腔室和所述活动腔室均呈圆柱形，所述第一腔室对应的径向尺寸为r1，所述活动腔室对应的径向尺寸为r2，0.2mm≤(r1-r2)。
可选地，所述第二腔室配置成与所述活塞间隙配合。
可选地，所述压力泵泵头还包括设置在所述第一开口处的第一密封结构，所述第一密封结构与所述缸体连接以封闭所述第一开口。
可选地，所述第一密封结构包括第一连接件以及连接于所述第一连接件的第一密封件；所述第一密封件位于所述第一腔室内，以封闭所述第一开口；所述第一连接件与所述缸体固定连接。
可选地，所述压力泵泵头还包括紧固件，所述缸体上设置有第一连接孔，所述第一连接件上设置有第二连接孔，所述紧固件同时与所述第一连接孔和所述第二连接孔配合，以将所述第一连接件固定至所述缸体。
可选地，所述第一连接孔、所述第二连接孔以及所述紧固件的数量均为多个，且所述第一连接孔、所述第二连接孔以及所述紧固件一一对应设置，多个所述第一连接孔绕所述第一开口的周向均匀分布。
可选地，所述缸体还具有与所述第二腔室连通的第二开口，所述压力泵泵头还包括设置在所述第二开口处的第二密封结构；所述第二密封结构与所述缸体连接以封闭所述第二开口。
可选地，所述压力泵泵头还包括第一单向阀、第二单向阀、第三单向阀以及第四单向阀；
所述第一单向阀安装于第一进液口，所述第二单向阀安装于所述第一出液口，所述第三单向阀安装于所述第二进液口，所述第四单向阀安装于所述第二出液口。
本申请的实施例还提供了一种压力泵。该压力泵包括上述任意一种压力泵泵头。
本申请实施例的压力泵泵头及压力泵的有益效果包括，例如：
本申请的实施例提供了一种压力泵泵头，其包括缸体。缸体具有依次连通的第一腔室、活动腔室和第二腔室。缸体还具有与第一腔室对应的第一内壁以及和第二腔室对应的第二内壁。第一内壁上开设有第一进液口和第一出液口，第二内壁上开设有第二进液口和第二出液口。活动腔室配置成与活塞密封配合，使用时，活塞在活动腔室内滑动，以改变活塞两侧空间的容积。当活塞沿从第一腔室指向第二腔室的方向运动时，从第一进液口处的流体流入第一腔室，第二腔室内的流体从第二出液口流出；当活塞沿从第二腔室指向第一腔室的方向运动时，第一腔室中的流体从第一出液口流出，第二进液口处的流体进入第二腔室中，从而通过两个腔室的交替出液，实现了泵头的连续供液。
第一腔室远离活动腔室的一端具有配置成供活塞进入的第一开口，安装时，活塞通过第一开口进入第一腔室，穿过第一腔室后进入活动腔室，同时第一腔室设置为与活塞间隙配合，因此第一腔室的尺寸大于活塞，从而避免在活塞穿过第一腔室的过程中，受到由于设置第一进液口和第一出液口所形成的毛刺影响，也就避免了毛刺损伤活塞，进而避免了影响活塞密封性能的问题，活塞的密封性能得到保证，密封效果好。
本申请的实施例还提供了一种压力泵，其包括上述的压力泵泵头。由于该压力泵包括上述的压力泵泵头，因此也具有可以连续供液、活塞的密封性能得到保证以及密封效果好的有益效果。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，应当理解，以下附图仅示出了本申请的某些实施例，因此不应被看作是对范围的限定，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他相关的附图。
图1为本申请实施例提供的压力泵泵头在第一视角下的剖面结构示意图；
图2为本申请实施例提供的压力泵泵头中缸体的剖面结构示意图；
图3为图2中Ⅲ处的局部结构放大示意图；
图4为图1中Ⅳ处的局部结构放大示意图；
图5为本申请实施例提供的压力泵泵头中另一种第一引导面的结构示意图；
图6为图1中Ⅵ处的局部结构放大示意图；
图7为图1中Ⅶ处的局部结构放大示意图；
图8为本申请实施例提供的压力泵泵头中缸体的结构示意图；
图9为本申请实施例提供的压力泵泵头中盖体的结构示意图；
图10为本申请实施例提供的压力泵泵头在第二视角下的剖面结构示意图。
图标：10-压力泵泵头；100-缸体；110-工作腔；111-第一腔室；112-活动腔室；113-第二腔室；114-第一内壁；115-第二内壁；116-第三内壁；117-第一引导面；1171-锥面；1172-圆弧面；118-第二引导面；121-第一进液口；122-第一出液口；123-第二进液口；124-第二出液口；125-第一开口；126-第二开口；131-第一连接孔；132-卡接槽；133-第三开口；134-第一安装孔；210-第一密封结构；211-第一密封件；212-第一连接件；213-第二连接孔；220-第二密封结构；221-第二密封件；222-第二连接件；230-紧固件；300-活塞结构；310-活塞杆；320-活塞；321-活塞本体；322-橡胶圈；400-盖体；411-进液通道；412-出液通道；413-卡扣凸起；414-第二安装孔；511-第一单向阀；512-第二单向阀。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚和完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。通常在此处附图中描述和示出的本申请实施例的组件可以以各种不同的配置来布置和设计。
因此，以下对在附图中提供的本申请的实施例的详细描述并非旨在限制要求保护的本申请的范围，而是仅仅表示本申请的选定实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步定义和解释。
在本申请的描述中，需要说明的是，若出现术语“上”、“下”、“内”或“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，或者是该发明产品使用时惯常摆放的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件 必须具有特定的方位或者必须以特定的方位构造和操作，因此不能理解为对本申请的限制。
此外，若出现术语“第一”或“第二”等仅用于区分描述，而不能理解为指示或暗示相对重要性。
需要说明的是，在不冲突的情况下，本申请的实施例中的特征可以相互结合。
图1为本实施例提供的压力泵泵头10在第一视角下的剖面结构示意图，图2为本实施例提供的压力泵泵头10中缸体100的剖面结构示意图。请结合参考图1和图2，本实施例提供了一种压力泵泵头10，相应地，提供了一种压力泵(图未示出)。
压力泵泵头10包括缸体100。缸体100具有依次连通的第一腔室111、活动腔室112和第二腔室113。缸体100还具有与第一腔室111对应的第一内壁114以及和第二腔室113对应的第二内壁115。第一内壁114上开设有第一进液口121和第一出液口122，第二内壁115上开设有第二进液口123和第二出液口124。活动腔室112配置成与活塞320密封配合，使用时，活塞320在活动腔室112内滑动，以改变活塞320两侧空间的容积。当活塞320沿从第一腔室111指向第二腔室113的方向运动时，从第一进液口121处的流体流入第一腔室111，第二腔室113内的流体从第二出液口124流出；当活塞320沿从第二腔室113指向第一腔室111的方向运动时，第一腔室111中的流体从第一出液口122流出，第二进液口123处的流体进入第二腔室113中，从而通过两个腔室的交替出液，实现了压力泵泵头10的连续供液。
第一腔室111远离活动腔室112的一端具有配置成供活塞320进入的第一开口125，安装时，活塞320通过第一开口125进入第一腔室111，穿过第一腔室111后进入活动腔室112，同时第一腔室111设置为与活塞320间隙配合，因此第一腔室111的尺寸大于活塞320，从而避免在活塞320穿过第一腔室111的过程中，受到由于设置第一进液口121和第一出液口122所形成的毛刺影响，也就避免了毛刺损伤活塞320，进而避免影响活塞320密封性能的问题，活塞320的密封性能得到保证，密封效果好。
压力泵包括上述的压力泵泵头10，同时压力泵还包括进液管(图未示出)和出液管(图未示出)，进液管与第一进液口121和第二进液口123均连通，从而随活塞320的运动为第一腔室111和第二腔室113供液；出液管与第一出液口122和第二出液口124均连通，从而随活塞320的运动将第一腔室111和第二腔室113中的液体输出，由于第一腔室111和第 二腔室113交替出液，从而实现了出液管的连续出液。
下面对本实施例提供的压力泵泵头10进行进一步说明：
请结合参照图1和图2，在本实施例中，压力泵泵头10包括缸体100和活塞320，缸体100内具有工作腔110，活塞320与工作腔110滑动配合，从而将工作腔110分隔成两个相互独立的子腔室，两个子腔室分别为第一子腔室和第二子腔室，并且通过活塞320的滑动改变第一子腔室和第二子腔室的容积。
具体地，工作腔110包括依次连接的第一腔室111、活动腔室112和第二腔室113，缸体100具有对应于第一腔室111的第一内壁114、对应于第二腔室113的第二内壁115以及对应于活动腔室112的第三内壁116。活塞320安装进入工作腔110中后，活塞320与活动腔室112可滑动配合，且活塞320与第三内壁116密封接触，通过活塞320分隔形成的第一子腔室由第一腔室111和活动腔室112位于活塞320靠近第一腔室111一侧的部分构成，第二子腔室由第二腔室113和活动腔室112位于活塞320靠近第二腔室113一侧的部分构成。
第一内壁114上开设有第一进液口121和第一出液口122，压力泵工作过程中活塞320始终在活动腔室112内往复滑动，因此第一进液口121和第一出液口122始终与第一子腔室连通；第二内壁115上开设有第二进液口123和第二出液口124，压力泵工作过程中活塞320始终在活动腔室112内往复滑动，因此第二进液口123和第二出液口124始终与第二子腔室连通。当活塞320向靠近第一腔室111的方向运动时，第一子腔室的容积变小，第一子腔室内的流体受到挤压从第一出液口122流出，第二子腔室的容积变大，从而导致第二子腔室内的压力降低，第二进液口123中的流体在压力作用下流入第二子腔室；当活塞320向靠近第二腔室113的方向运动时，第二子腔室的容积变小，第二子腔室内的流体受到挤压从第二出液口124流出，第一子腔室的容积变大，从而导致第一子腔室内的压力降低，第一进液口121中的流体在压力作用下流入第一子腔室。
可选地，第一腔室111、活动腔室112和第二腔室113分别呈圆柱形，且第一腔室111、活动腔室112和第二腔室113同轴设置。需要说明的，此处并不对第一腔室111、活动腔室112和第二腔室113的形状以及相对位置进行限制，可以理解的，在其他实施例中，也可以根据用户的需求，具体设置各个腔室的形状和相对位置关系，例如将第一腔室111设置为方形，或者将第二腔室113相对活动腔室112偏心设置等。
第一腔室111远离活动腔室112的一端具有第一开口125，安装时，活塞320从第一开 口125进入第一腔室111，穿过第一腔室111后进入活动腔室112，进而与活动腔室112密封配合。第一腔室111与活塞320间隙配合，即第一腔室111对应的径向尺寸r1大于活动腔室112对应的径向尺寸r2。需要说明的，在本实施例的描述中，径向尺寸为相应圆柱形的半径尺寸。由于第一腔室111与活塞320间隙配合，因此在活塞320沿第一腔室111的轴向向活动腔室112运动的过程中，活塞320与第一内壁114之间存在间隙，即活塞320与第一内壁114无接触，从而能够有效避免由于在第一内壁114上开设第一进液口121和第一出液口122所产生的毛刺等与活塞320接触，也就避免了活塞320与毛刺接触而导致受损，进而避免了影响密封性能的问题。
为了保证活塞320在安装过程中不与毛刺接触受损，进一步地，0.2mm≤(r1-r2)，可选地，(r1-r2)＝0.2mm、0.5mm或0.8mm等。可以理解的，在其他实施例中，也可以根据需求，具体将r1和r2的差值设置为其他数值，能够保证r1大于r2、活塞320在安装过程中不会由于毛刺受损、影响密封效果即可。
图3为图2中Ⅲ处的局部结构放大示意图。请结合参照图1-图3，在本实施例中，缸体100还具有设置在第一内壁114和第三内壁116之间的第一引导面117，第一引导面117配置成引导活塞320从第一腔室111伸入活动腔室112，具体的，沿第一腔室111指向活动腔室112的方向(即如图2中所示的左右方向)，第一引导面117至活动腔室112的轴线的距离逐渐减小。通过设置第一引导面117引导活塞320安装，从而使活塞320的安装更加方便，减小对活塞320的损伤。
图4为图1中Ⅳ处的局部结构放大示意图。请参照图4，压力泵泵头10还包括活塞结构300，具体地，活塞结构300包括活塞杆310和连接在活塞杆310上的活塞320。活塞320包括活塞本体321以及安装在活塞本体321上的橡胶圈322。活塞本体321为由位于活塞杆310中部的周面沿径向向外凸出形成凸出结构，且活塞本体321上具有密封槽，橡胶圈322卡设在密封槽内，从而与活塞本体321连接，同时橡胶圈322的外端凸出活塞本体321的周面设置。可以理解的，在其他实施例中，也可以采用其他方式将固定橡胶圈322和活塞本体321，例如胶粘。
安装后，橡胶圈322受到第三内壁116的挤压变形从而与第三内壁116密封贴合，实现活塞320与活动腔室112的密封配合，活塞杆310的一端从第一腔室111内伸出，从而将活塞杆310与位于缸体100外的动力结构(图未示出)连接，通过动力结构带动活塞杆310沿自身轴线往复运动，进而带动活塞320相对第三内壁116往复滑动，实现对流体的 泵进。通过设置第一引导面117引导活塞320安装进入活动腔室112，从而引导橡胶圈322在安装过程中逐渐进行变形，不仅能够降低安装难度，同时可以减小对橡胶圈322的损伤。
由于第一腔室111和活动腔室112均为圆柱形，可选地，第一引导面117为锥面，沿从第一腔室111指向活动腔室112的方向，第一引导面117的径向尺寸逐渐减小，因此在活塞320经过第一引导面117向活动腔室112内运动时，橡胶圈322受到第一引导面117的挤压逐渐变形，直至变形到与第一内壁114相匹配后顺利进入活动腔室112中。
需要说明的，此处并不对第一引导面117的具体形状进行限制，可以理解的，在其他实施例中，也可以根据需求具体设置第一引导面117，例如将第一引导面117设置为圆弧面或者设置为由圆弧面1172和锥面1171组合形成(如图5所示)，沿从第一腔室111指向活动腔室112的方向，第一引导面117到工作腔110的轴线(即活动腔室112的轴线)的距离逐渐减小、能够引导活塞320进入活动腔室112即可。还需要说明的，图5中所示出的第一引导面117包括锥面1171以及两个圆弧面1172，两个圆弧面1172分别位于锥面1171的两侧，可以理解的，在其他实施例中，也可以将第一引导面117设置为包括一个锥面1171以及一个圆弧面1172，圆弧面1172位于锥面1171与第一内壁114之间或圆弧面1172位于锥面1171与第三内壁116之间，或者将第一引导面设置为包括两个圆弧面1172，两个圆弧面1172的圆心分别位于第一引导面的两侧。
进一步地，锥面的锥角(即第一引导面117在如图2和图3所示的截面上的投影所形成的等腰梯形中，两腰夹设形成的角度)为α，30°≤α≤150°，可选地，α＝30°、90°或150°。
进一步地，第一引导面117的两端分别与第一内壁114和第三内壁116连接，沿第一腔室111到活动腔室112的方向，第一内壁114、第一引导面117和第三内壁116依次连接，第一引导面117大端的径向尺寸与第一内壁114的径向尺寸相同，第一引导面117小端的径向尺寸与第三内壁116的径向尺寸相同。将第一引导面117设置在第一内壁114和第三内壁116的连接处，第一引导面117的设置更加方便。可以理解的，在其他实施例中，也可以根据需求设置第一引导面117的位置，例如将第一引导面117设置为从第三内壁116靠近第一内壁114的一端凸出且向第三内壁116靠近的面。
请参照图2，在本实施例中，第二腔室113也与活塞320间隙配合，可选地，第二腔室113对应的径向尺寸为r3，r3＝r1，从而便于保证第二腔室113具有与第一腔室111相同的容积，进而有助于对注射进行精确控制。进一步地，缸体100还具有设置在第二内壁115和第三内壁116之间的第二引导面118。具体地，第二引导面118的形状尺寸与第一引导面 117相同，进而第二引导面118对应形成的位于第二腔室113与活动腔室112之间的空间大小与第一引导面117对应形成的位于第一腔室111与活动腔室112之间的空间大小相等。
进一步地，缸体100还具有与第二腔室113连通的第二开口126，第二开口126位于第二腔室113远离活动腔室112的一端。由于开设第二开口126，在进行活塞320安装时，也可以将活塞320从第二开口126处装入第二腔室113中，穿过第二腔室113后，在第二引导面118的引导下安装进入活动腔室112，活塞320的安装更加简便。
图6为图1中Ⅵ处的局部结构放大示意图。请结合参照图1和图6，在本实施例中，压力泵泵头10还包括设置在第一开口125处的第一密封结构210，第一密封结构210与缸体100连接以封闭第一开口125，从而避免在工作过程中，流体从第一开口125处泄漏。
可选地，第一密封结构210包括第一连接件212以及连接于第一连接件212的第一密封件211。第一连接件212与缸体100固定连接，从而将第一密封结构210固定至缸体100。第一密封件211位于第一腔室111内，且与第一内壁114密封配合，从而将第一开口125封闭，通过将第一密封件211设置在第一腔室111内，同时通过第一密封件211与第一内壁114的密封配合实现密封，有助于提高密封效果。
进一步地，压力泵泵头10还包括紧固件230。缸体100上开设有第一连接孔131，第一连接件212上开合有第二连接孔213。紧固件230同时与第一连接孔131和第二连接孔213配合，从而将第一连接件212固定至缸体100。具体地，紧固件230为螺钉，第一连接孔131为螺纹孔，螺钉穿过第二连接孔213后与第一连接孔131螺接，从而实现第一连接件212与缸体100的固定连接。可以理解的，在其他实施例中，也可以采用其他类型的紧固件230将第一连接件212固定至缸体100，例如销钉。
需要说明的，此处并不对第一连接件212和缸体100的连接方式进行限制，可以理解的，在其他实施例中，也可以根据需求选择其他方式将第一连接件212固定至缸体100，例如胶粘、卡接等，能够保证第一连接件212和缸体100连接可靠性即可。
进一步地，第一连接孔131、第二连接孔213以及紧固件230的数量均为多个，且第一连接孔131、第二连接孔213以及紧固件230一一对应设置。即每一第一连接孔131与一个第二连接孔213对应，且紧固件230中的一个与该第一连接孔131和该第二连接孔213配合，通过多个紧固件230的紧固作用，使得第一连接件212与缸体100的连接更加可靠。同时多个第一连接孔131沿第一开口125的周向均匀分布。可选地，第一连接孔131的数量为四个，相应地，第二连接孔213以及紧固件230的数量也为四个，可以理解的，在其 他实施例中，也可以根据需求具体设置第一连接孔131、第二连接孔213以及紧固件230的数量，例如将第一连接孔131、第二连接孔213以及紧固件230的数量设置为三个或者六个等。
进一步地，第一密封结构210还具有供活塞杆310穿设的通孔，具体地，该通孔穿过第一连接件212和第一密封件211设置，安装后，活塞杆310从通孔穿出第一腔室111，从而与位于缸体100外的动力结构连接，进而在动力结构的驱动下往复运动。第一密封件211与活塞杆310密封配合，从而避免缸体100内的流体从通孔内泄漏，压力泵泵头10的密封效果更好。
图7为图1中Ⅶ处的局部结构放大示意图。请结合参照图1和图6，在本实施例中，压力泵泵头10还包括设置在第二开口126处的第二密封结构220，第二密封结构220与缸体100连接以封闭第二开口126，防止缸体100内的流体从第二开口126处泄漏。第二密封结构220与第一密封结构210相同。具体地，第二密封结构220包括第二连接件222以及连接在第二连接件222上的第二密封件221。第二连接件222与缸体100固定连接，从而实现第二密封结构220与缸体100的固定。第二密封件221位于第二腔室113内，且与第二内壁115密封配合，从而将第二开口126封闭，密封效果好。进一步地，第二连接件222与缸体100通过紧固件230实现固定。
需要说明的，此处并不对第二密封结构220的具体结构进行限制，可以理解的，在其他实施例中，也可以根据需求采用其他结构对第二开口126进行密封，能够保证密封效果即可。
图8为本实施例提供的压力泵泵头10中缸体100的结构示意图，图9为本实施例提供的压力泵泵头10中盖体400的结构示意图，图10为本实施例提供的压力泵泵头10在第二视角下的剖面结构示意图。请结合参照图8-图10，在本实施例中，压力泵泵头10还包括连接在缸体100下方的盖体400。盖体400内具有进液通道411和出液通道412，当缸体100安装到盖体400上后，进液通道411与第一进液口121和第二进液口123均连通，出液通道412与第一出液口122和第二出液口124均连通，使用时，压力泵的进液管与进液通道411连通，随活塞320的运动为第一子腔室和第二子腔室供应流体，压力泵的出液管与出液通道412连通，随活塞320的运动，第一子腔室和第二子腔室中的流体交替进入出液通道412，并通过出液通道412进入出液管中，实现连续供液。
进一步地，缸体100上开设有卡接槽132，盖体400上设置有与卡接槽132卡接配合 的卡扣凸起413，通过卡扣凸起413与卡接槽132的卡接将缸体100与盖体400连接固定。具体地，进一步地，卡接槽132开设在缸体100的下侧，同时在卡接槽132的侧壁上设置有与卡扣凸起413配合的开口，该开口为第三开口133，第三开口133贯通缸体100的侧壁设置，卡接时，卡扣凸起413从缸体100下端伸入卡接槽132内，且开合于第三开口133处，从而实现缸体100与盖体400的卡合固定。
进一步地，卡接槽132和卡扣凸起413的数量均为多个，且卡接槽132与卡扣凸起413一一对应连接，通过多个卡接槽132与多个卡扣凸起413的卡接，使得缸体100与盖体400的连接定位更加可靠。可选地，卡扣凸起413的数量为六个，六个卡扣凸起413阵列设置。相应地，卡接槽132的数量为六个，且位置与卡扣凸起413对应设置。可以理解的，在其他实施例中，也可以根据用户的需求，具体设置卡扣凸起413和卡接槽132的数量，例如将卡扣凸起413和卡接槽132的数量均设置为四个或八个等。
进一步地，压力泵泵头10还包括单向阀，具体地，单向阀的数量为四个，四个单向阀分别为第一单向阀511、第二单向阀512、第三单向阀(图未示出)和第四单向阀(图未示出)。第一单向阀511对应于第一进液口121设置，以使第一进液口121处的流体沿从进液通道411向第一腔室111的方向单向流动；第二单向阀512对应于第一出液口122设置，以使第一出液口122处的流通沿从第一腔室111向出液通道412的方向单向流动；第三单向阀对应于第二进液口123设置，以使第二进液口123处的流体沿从进液通道411向第二腔室113的方向单向流动；第四单向阀对应于第二出液口124设置，以使第二出液口124处的流体沿从第二腔室113向出液通道412的方向单向流动。
具体地，缸体100上设置有第一安装孔134，第一安装孔134的数量为四个，四个第一安装孔134分别对应与第一进液口121、第一出液口122、第二进液口123和第二出液口124连通设置；盖体400上设置有第二安装孔414，第二安装孔414的数量为四个，四个第二安装孔414分别与四个第一安装孔134对应设置，且四个安装孔中的两个与进液通道411连通，另外两个与出液通道412连通。当缸体100与盖体400卡合安装后，第一安装孔134与第二安装孔414连通形成配置成安装单向阀的容置空间。
根据本实施例提供的一种压力泵泵头10，压力泵泵头10的工作原理：
安装时，活塞320通过第一开口125进入第一腔室111中，随后在第一引导面117的引导作用下进入活动腔室112，并与活动腔室112密封配合，从而将缸体100的工作腔110分隔成两个独立的子腔室。由于与第一腔室111对应的第一内壁114上注塑或打孔形成有 第一进液口121和第二进液口123，因此在第一进液口121和第二进液口123处会出现毛刺，通过将第一腔室111设置为与活塞320间隙配合，避免在活塞320穿过第一腔室111进入活动腔室112时与毛刺接触，也就避免了毛刺损伤活塞320的橡胶圈322，进而避免造成橡胶圈322损伤影响密封效果的问题。
使用时，活塞320在动力结构的驱动下往复运动，以改变第一子腔室和第二子腔室的容积大小。当活塞320向靠近第一腔室111的方向运动时，第一子腔室的容积变小，第一子腔室内的流体受到挤压通过第一出液口122进入出液通道412，从而进行输注；第二子腔室的容积变大，进液通道411中的流体通过第二进液口123进入第二子腔室后。当活塞320向靠近第二腔室113的方向运动时，第一子腔室的容积变大，进液通道411内的流体通过第一进液口121进入第一子腔室中；第二子腔室的容积变小，第二腔室113中的流体通过第二出液口124进入出液通道412，从而进行输注。
本实施例提供的一种压力泵泵头10至少具有以下优点：
本申请的实施例提供了一种压力泵泵头10，其通过开设与第一子腔室连通的第一进液口121和第一出液口122以及与第二子腔室连通的第二进液口123和第二出液口124，实现了压力泵的连续输注，使用效果好。同时通过将第一进液口121和第一出液口122开设在与第一腔室111对应的第一内壁114处，并且将第一腔室111设置为与活塞320间隙配合，从而避免了在安装过程中毛刺损伤活塞320，进而避免了影响活塞320的密封性能的问题，密封效果更好。
本实施例也提供了一种压力泵，其包括上述的压力泵泵头10。由于该压力泵包括上述的压力泵泵头10，因此也具有能连续输注，活塞320密封性能好，能更加精准地控制输注过程的有益效果。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (14)

  1. 一种压力泵泵头，其特征在于，包括缸体，所述缸体具有依次连通的第一腔室、活动腔室以及第二腔室；所述缸体具有与所述第一腔室对应的第一内壁和与所述第二腔室对应的第二内壁；所述第一内壁上开设有第一进液口和第一出液口，所述第二内壁上开设有第二进液口和第二出液口；
    所述活动腔室配置成与活塞密封配合；所述第一腔室远离所述活动腔室的一端具有配置成供所述活塞进入的第一开口，所述第一腔室配置成与所述活塞间隙配合。
  2. 根据权利要求1所述的压力泵泵头，其特征在于，所述缸体具有与所述活动腔室对应的第三内壁；所述第一内壁和所述第三内壁之间还设置有第一引导面，所述第一引导面配置成引导所述活塞从所述第一腔室伸入所述活动腔室内。
  3. 根据权利要求2所述的压力泵泵头，其特征在于，沿所述第一腔室指向所述活动腔室的方向，所述第一引导面至所述活动腔室的轴线的距离逐渐减小。
  4. 根据权利要求3所述的压力泵泵头，其特征在于，所述第一引导面包括锥面，所述锥面的锥角为α，30°≤α≤150°。
  5. 根据权利要求2所述的压力泵泵头，其特征在于，所述第一引导面的两端分别与所述第一内壁和所述第三内壁连接。
  6. 根据权利要求1所述的压力泵泵头，其特征在于，所述第一腔室和所述活动腔室均呈圆柱形，所述第一腔室对应的径向尺寸为r1，所述活动腔室对应的径向尺寸为r2，0.2mm≤(r1-r2)。
  7. 根据权利要求1所述的压力泵泵头，其特征在于，所述第二腔室配置成与所述活塞间隙配合。
  8. 根据权利要求1-7任一项所述的压力泵泵头，其特征在于，所述压力泵泵头还包括设置在所述第一开口处的第一密封结构，所述第一密封结构与所述缸体连接以封闭所述第一开口。
  9. 根据权利要求8所述的压力泵泵头，其特征在于，所述第一密封结构包括第一连接件以及连接于所述第一连接件的第一密封件；所述第一密封件位于所述第一腔室内，以封闭所述第一开口；所述第一连接件与所述缸体固定连接。
  10. 根据权利要求9所述的压力泵泵头，其特征在于，所述压力泵泵头还包括紧固件， 所述缸体上设置有第一连接孔，所述第一连接件上设置有第二连接孔，所述紧固件同时与所述第一连接孔和所述第二连接孔配合，以将所述第一连接件固定至所述缸体。
  11. 根据权利要求10所述的压力泵泵头，其特征在于，所述第一连接孔、所述第二连接孔以及所述紧固件的数量均为多个，且所述第一连接孔、所述第二连接孔以及所述紧固件一一对应设置，多个所述第一连接孔沿所述第一开口的周向均匀分布。
  12. 根据权利要求1-7任一项所述的压力泵泵头，其特征在于，所述缸体还具有与所述第二腔室连通的第二开口，所述压力泵泵头还包括设置在所述第二开口处的第二密封结构；所述第二密封结构与所述缸体连接以封闭所述第二开口。
  13. 根据权利要求1-7任一项所述的压力泵泵头，其特征在于，所述压力泵泵头还包括第一单向阀、第二单向阀、第三单向阀以及第四单向阀；
    所述第一单向阀安装于第一进液口，所述第二单向阀安装于所述第一出液口，所述第三单向阀安装于所述第二进液口，所述第四单向阀安装于所述第二出液口。
  14. 一种压力泵，其特征在于，所述压力泵包括如权利要求1-13任一项所述的压力泵泵头。
PCT/CN2020/088315 2019-12-27 2020-04-30 一种压力泵泵头及压力泵 WO2021128685A1 (zh)

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