An infusion device

Abstract

The utility model belongs to grouting machine technical field especially relates to a kind of infusion devices, including the confluence seat, infusion channel is set in the confluence seat, infusion channel two ends are respectively provided with liquid inlet connector and liquid outlet connector, and infusion channel middle part is connected with plunger cavity, plunger cavity is movably provided with plunger rod, liquid inlet connector includes liquid inlet nozzle and connecting seat, connecting seat is detachably connected with the confluence seat, connecting seat is provided with connecting hole, first liquid inlet hole is provided in liquid inlet nozzle, connecting hole and liquid inlet are communicated by first installation cavity;First installation cavity is provided with compression spring and sealing ball, connecting hole end is provided with first fixed base, first fixed base is provided with flow guide hole, alloy sealing gasket is fixedly arranged on the side of first fixed base away from connecting hole, compression spring drives sealing ball to be tightly on alloy sealing gasket and seal flow guide hole, the utility model aims at providing a kind of infusion devices with long service life and convenient maintenance replacement.

Description

Technical Field

[0001] This utility model belongs to the field of grouting machine technology, and specifically relates to an infusion device. Background Technology

[0002] High-pressure grouting machines are professional construction tools used for chemical grouting and sealing of cracks, expansion joints, construction joints, and structural joints in various buildings and underground concrete structures, as well as for structural reinforcement. High-pressure grouting machines can seal leaks without trenching, have high pressure, can be used on the back side of water, and have higher pressure, higher efficiency, and better quality than hand pumps.

[0003] The outlet connector is a connector on the grouting machine used to dispense the sealing agent. Traditional outlet connectors are one-piece structures, with a one-way valve between the outlet connector and the grouting machine to prevent backflow of the sealing agent, as illustrated in Chinese Utility Model Patent CN202420117439.1. A grouting machine is disclosed, comprising a frame, a liquid discharge device, a power unit, and a transmission device connecting the power unit and the liquid discharge device. The transmission device includes a reduction gear set and a crankshaft, which is rotatably mounted on the frame and connected to the output end of the reduction gear set. Two sets of eccentric portions are provided on the crankshaft, eccentrically positioned relative to each other. Connecting rods are rotatably mounted on each of the two eccentric portions, and each connecting rod is connected to a liquid discharge device. The liquid discharge device includes a manifold with a cavity. A plunger is slidably mounted in the cavity and rotatably connected to the connecting rod. An inlet channel and an outlet channel are connected to the inner cavity, and one-way valves are respectively provided in the inlet and outlet channels. The eccentric portions on the crankshaft drive the two sets of liquid discharge devices to discharge liquid alternately.

[0004] As shown in the attached diagram of the instruction manual, the one-way valve in the above structure includes a compression spring and a ball bearing. The compression spring directly drives the ball bearing to press against the manifold seat. However, the compression spring and the ball bearing are easily lost during the disassembly and maintenance of the grouting machine, which affects the disassembly and maintenance of the grouting machine. In addition, the ball bearing and the connection between the manifold seat and the ball bearing are easily damaged during use, which affects the service life of the grouting machine. The ball bearing is easy to replace, but the manifold seat is not convenient to replace, which affects the maintenance cost of the grouting machine. Summary of the Invention

[0005] In order to overcome the defects in the prior art, the purpose of this utility model is to provide an infusion device that is easy to maintain and replace and has a long service life.

[0006] The purpose of this utility model is achieved as follows:

[0007] An infusion device includes a manifold, an infusion channel in the manifold, an inlet connector and an outlet connector at both ends of the infusion channel, and a plunger cavity connected in the middle of the infusion channel. A plunger rod is movably disposed in the plunger cavity. The inlet connector includes a detachably connected inlet nozzle and a connecting seat. The connecting seat is detachably connected to the manifold. The connecting seat has a connecting hole communicating with the infusion channel. The inlet nozzle has a first inlet hole. The connecting hole and the inlet hole are connected through a first mounting cavity.

[0008] The first mounting cavity is equipped with a compression spring and a sealing ball. A first fixing seat is provided at the end of the connecting hole. A guide hole is provided in the first fixing seat. Liquid in the first inlet hole enters the first mounting cavity after passing through the guide hole. An annular alloy sealing gasket is fixedly provided on the side of the first fixing seat away from the connecting hole. The compression spring drives the sealing ball to press against the alloy sealing gasket and seal the guide hole. High-pressure liquid can drive the sealing ball to disengage from the alloy sealing gasket, so that the liquid can pass through the guide hole and the first mounting cavity and enter the infusion channel and plunger cavity.

[0009] The present invention is further configured such that: the inlet end is provided with an installation hole, the connecting seat is provided with a positioning wall, the connecting seat is threadedly connected to the installation hole, and the end of the installation hole can drive the alloy sealing gasket to press against the positioning wall, thereby fixing the alloy sealing gasket in place.

[0010] The present invention is further configured such that: the first fixing seat is provided with a fixing groove adapted to the alloy sealing gasket, the fixing groove is connected to the first liquid inlet hole, and one end of the alloy sealing gasket passes through the fixing groove, so that the end of the mounting hole can be pressed against the step portion by the first fixing seat.

[0011] The present invention is further configured such that: the first fixing seat is made of plastic, and the alloy sealing gasket is tightly fitted with the fixing groove.

[0012] The present invention is further configured such that the sealing ball is made of ceramic material.

[0013] The present invention is further configured such that: the alloy sealing gasket is a tungsten carbide sealing ring, the tungsten carbide sealing ring is provided with a through hole connecting the first liquid inlet hole and the first mounting cavity, and a tapered sealing slope is provided at the end of the through hole near the sealing ball, and the compression spring drives the sealing ball to press against the sealing slope.

[0014] The present invention is further configured such that: the liquid outlet connector includes a connector body, the connector body is provided with a liquid outlet nozzle and a control part, the liquid outlet nozzle is provided with a liquid outlet hole, the connector body is provided with a connecting part connected to the manifold at the end away from the liquid outlet nozzle, the connecting part is provided with a second mounting cavity, one end of the second mounting cavity is connected to the liquid outlet hole, the other end of the second mounting cavity is provided with an opening, the second mounting cavity is provided with a compression spring and a sealing ball, the opening is detachably provided with a second fixing seat, the second fixing seat is provided with a second liquid inlet hole, and an annular alloy sealing gasket is provided on one side of the second fixing seat. The compression spring drives the sealing ball to press against the alloy sealing gasket to seal the second liquid inlet hole; high pressure liquid can drive the sealing ball to disengage from the alloy sealing gasket, so that liquid can be discharged from the liquid outlet hole through the second mounting cavity.

[0015] The present invention is further configured such that: a threaded portion is provided on the outer periphery of the connecting portion, a second fixing hole is provided on the manifold, one end of the second fixing hole is provided with an internal thread adapted to the threaded portion, a sealing groove is provided on the side of the threaded portion away from the control portion, a sealing ring is provided in the sealing groove, an annular pressure groove is provided on the side of the sealing groove away from the threaded portion, a through hole connected to the annular pressure groove is provided on the side wall of the second mounting cavity, both the sealing ring and the annular pressure groove pass through the second fixing hole, a pressure measuring hole connected to the annular pressure groove is provided on the side wall of the second fixing hole, and a pressure gauge is installed in the pressure measuring hole.

[0016] The present invention is further configured such that: the side of the second mounting cavity extends outward to form a stepped portion, and one end of the fixing seat protrudes from the second mounting cavity; the end of the second fixing hole drives the alloy sealing gasket to press against the stepped portion through the second fixing seat, and fixes the alloy sealing gasket in the second mounting cavity.

[0017] The present invention is further configured such that: the second fixing seat is made of plastic, the second fixing seat is tightly fitted with the second mounting cavity and the second fixing seat is relatively fixed to the connecting part, and an inclined guide surface is provided on the side of the second mounting cavity or the side of the second fixing seat, and the second fixing seat is guided into the second mounting cavity through the guide surface.

[0018] The advantages of this utility model compared to the prior art are:

[0019] The liquid inlet connector of this utility model includes a detachably connected liquid inlet nozzle and a connecting seat. The compression spring, sealing ball, alloy sealing gasket, and first fixing seat are all disposed between the liquid inlet nozzle and the connecting seat. During assembly or disassembly, the user can directly disassemble and install the liquid inlet connector as a whole, which is convenient for disassembly and maintenance. In addition, the compression spring and sealing ball do not contact the manifold in this structure, which helps to reduce the wear of the manifold during use and extends the service life of the infusion device. The alloy sealing gasket helps to improve the sealing effect of the sealing ball on the liquid inlet. When the sealing ball and the alloy sealing gasket are worn, the user can replace the sealing ball and the alloy sealing gasket to continue using the liquid outlet connector, which helps to reduce the maintenance cost of the liquid outlet connector and extend its service life.

[0020] The mounting holes and positioning walls in this invention facilitate the positioning and installation of the first fixed seat and the alloy sealing gasket, preventing the initial deformation of the compression spring from affecting its initial elastic force. This also ensures that the minimum inlet pressure of the liquid inlet connector is the same, preventing the minimum inlet pressure of the grouting machine from being affected by maintenance or replacement of the liquid inlet connector, thus making it convenient for users. The fixed groove facilitates the pre-assembly and mating of the fixed seat and the alloy sealing gasket. Since one end of the alloy sealing gasket protrudes from the fixed groove, the first fixed seat can easily press the alloy sealing gasket against the step, facilitating the assembly and maintenance of the liquid inlet connector. The first fixed seat, made of plastic, has low production costs and facilitates the assembly and disassembly of the alloy sealing gasket and the fixed groove.

[0021] In this invention, the sealing ball made of ceramic material has high hardness and long service life. Ceramic material is also highly corrosion resistant, which can reduce static charge and heat generated by friction under high-speed movement, reducing the possibility of material sticking to the ball surface and thus extending the service life of the liquid inlet connector. The tungsten steel sealing ring has high wear resistance, high corrosion resistance, and high pressure resistance, avoiding damage to the alloy sealing gasket during use and further extending the service life of the liquid inlet connector.

[0022] In this invention, the compression spring and sealing ball are fixed in the second mounting cavity by the second fixing seat, resulting in a simple structure that is easy to manufacture and process. Furthermore, the grouting machine can be repaired by disassembling and installing the entire grouting connector, facilitating disassembly and maintenance. When the sealing ball and alloy sealing gasket wear out, the user can simply replace them to continue using the grouting connector, reducing maintenance costs and extending its service life. The annular pressure groove and pressure testing hole facilitate the measurement of hydraulic pressure in the second mounting cavity by a pressure gauge, making it convenient for the user.

[0023] The stepped portion of this invention facilitates defining the distance between the alloy sealing gasket and the end of the compression spring, thereby determining the initial elastic force of the compression spring. This ensures that the minimum pressure of the liquid outlet joint is the same, preventing the minimum liquid outlet pressure of the grouting machine from being affected by maintenance or replacement of the liquid outlet joint, thus facilitating user operation. Furthermore, since the end of the second fixing hole drives the alloy sealing gasket to press against the stepped portion through the second fixing seat, it prevents the connection between the second fixing seat and the joint body from loosening during use, which is beneficial for the stable installation of the alloy sealing gasket. The plastic second fixing seat is easy to manufacture and has low production costs. It is also easy to install and disassemble, and can be repeatedly disassembled and installed, avoiding wear on the second fixing seat and the side wall of the second mounting cavity during disassembly, which would affect the use of the second fixing seat. The guide surface facilitates the disassembly and installation of the second fixing seat, making it convenient for the assembly and maintenance of the liquid outlet joint. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a cross-sectional view of the present invention;

[0026] Figure 3 This is a cross-sectional view of the busbar in this utility model;

[0027] Figure 4 This is a cross-sectional view of the liquid inlet connector in this utility model;

[0028] Figure 5 This is an exploded schematic diagram of the liquid inlet connector in this utility model;

[0029] Figure 6 This is a cross-sectional view of the connection structure between the liquid inlet nozzle and the connecting seat in this utility model;

[0030] Figure 7 This is a schematic diagram of the liquid outlet connector in this utility model;

[0031] Figure 8 This is an exploded schematic diagram of the liquid outlet connector in this utility model;

[0032] Figure 9 This is a cross-sectional view of the liquid outlet connector in this utility model;

[0033] Figure 10 yes Figure 9 A magnified view of a section at point A in the middle;

[0034] Figure 11 This is a cross-sectional view of the connector body in this utility model;

[0035] Figure 12 This is a schematic diagram of the alloy sealing gasket in this utility model;

[0036] Figure 13 This is a structural schematic diagram of the fixed base in this utility model.

[0037] The labels in the diagram mean: 1-Manifold; 11-Infusion channel; 12-Plunger cavity; 13-First fixing hole;

[0038] 14-Second fixing hole; 15-Internal thread; 16-Pressure testing hole; 17-Sealing ring; 2-Liquid inlet connector; 21-Liquid inlet nozzle;

[0039] 22-Connecting seat; 23-Compression spring; 24-Sealing ball; 25-Alloy sealing gasket; 26-First fixing seat;

[0040] 211-First liquid inlet; 212-Mounting hole; 221-Connecting hole; 222-First mounting cavity; 251-Through hole;

[0041] 252-Sealing bevel; 261-Guide hole; 262-Fixing groove; 3-Liquid outlet connector; 31-Connector body;

[0042] 32-Second fixed seat; 311-Dispensing nozzle; 312-Control unit; 313-Connecting part; 314-Threaded part;

[0043] 315 - Sealing groove; 316 - Annular pressure groove; 317 - Through hole; 318 - Liquid outlet hole; 319 - Second mounting cavity;

[0044] 3191 - Step section; 3192 - Guide surface; 4 - Piston rod; 5 - Pressure gauge. Detailed Implementation

[0045] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0046] See Figures 1 to 13As shown, an infusion device includes a manifold 1 with an infusion channel 11. An inlet connector 2 and an outlet connector 3 are respectively provided at both ends of the infusion channel 11. A plunger cavity 12 is connected to the middle of the infusion channel 11, and a plunger rod 4 is movably disposed in the plunger cavity 12. The inlet connector 2 includes a detachably connected inlet nozzle 21 and a connecting seat 22. The connecting seat 22 is detachably connected to the manifold 1. The connecting seat 22 has a connecting hole 221 communicating with the infusion channel 11. The inlet nozzle 21 has a first inlet hole 211. The connecting hole 221 and the inlet hole 211 are connected through a first mounting cavity 222. The first mounting cavity 222 has a... The compression spring 23 and sealing ball 24 are provided. A first fixing seat 26 is provided at the end of the connecting hole 221. A guide hole 261 is provided in the first fixing seat 26. The liquid in the first liquid inlet 211 enters the first mounting cavity 222 after passing through the guide hole 261. An annular alloy sealing gasket 25 is fixedly provided on the side of the first fixing seat 26 away from the connecting hole 221. The compression spring 23 drives the sealing ball 24 to press against the alloy sealing gasket 25 and seal the guide hole 261. High pressure liquid can drive the sealing ball 24 to disengage from the alloy sealing gasket 25, so that the liquid can pass through the guide hole 261 and the first mounting cavity 222 and enter the infusion channel 11 and the plunger cavity 12.

[0047] In the above structure, the inlet connector 2 includes a detachably connected inlet nozzle 21 and a connecting seat 22. The compression spring 23, sealing ball 24, alloy sealing gasket 25, and first fixing seat 26 are all located between the inlet nozzle 21 and the connecting seat 22. During assembly or disassembly, the user can directly disassemble and install the inlet connector 2 as a whole, which is convenient for disassembly and maintenance. In this structure, the compression spring 23 and sealing ball 24 do not contact the manifold 1, which helps to reduce the wear of the manifold 1 during use and extends the service life of the infusion device. The alloy sealing gasket 25 helps to improve the sealing effect of the sealing ball 24 on the inlet hole. When the sealing ball 24 and the alloy sealing gasket 25 wear out, the user can replace the sealing ball 24 and the alloy sealing gasket 25 to continue using the outlet connector 3, which helps to reduce the maintenance cost of the outlet connector 3 and extend its service life.

[0048] In this invention, the inlet hole 211 is provided with an installation hole 212 at its end, and the connecting seat 22 is provided with a positioning wall. The connecting seat 22 is threadedly connected to the installation hole 212, and the end of the installation hole 212 can drive the alloy sealing gasket 25 to press against the positioning wall, thereby fixing the alloy sealing gasket 25 in place. The installation hole 212 and the positioning wall facilitate the positioning and installation of the first fixed seat 26 and the alloy sealing gasket 25, avoid the initial deformation of the compression spring 23 affecting the initial elastic force of the compression spring 23, and ensure that the minimum inlet pressure of the inlet connector 2 is the same. This prevents the minimum inlet pressure of the grouting machine from being affected by maintenance or replacement of the inlet connector 2, making it convenient for users.

[0049] In this embodiment, the infusion channel 11 is L-shaped. The two ends of the infusion channel 11 are respectively provided with a first fixing hole 13 and a second fixing hole 14. The inlet connector 2 and the outlet connector 3 are respectively detachably installed in the first fixing hole 13 and the second fixing hole 14. The plunger cavity 12 is connected to the bend of the infusion channel 11. When in use, the plunger rod 14 slides out of the plunger cavity 12 and creates a negative pressure in the plunger cavity 12 and the infusion channel 11, thereby causing the sealing ball 24 in the inlet connector 2 to move, thereby drawing the liquid into the manifold 1.

[0050] The first fixing seat 26 is provided with a fixing groove 262 that is adapted to the alloy sealing gasket 25. The fixing groove 262 is connected to the first liquid inlet 211, and one end of the alloy sealing gasket 25 passes through the fixing groove 262, so that the end of the mounting hole 212 can be pressed against the step portion 3191 by the first fixing seat 26. The fixing groove 262 facilitates the pre-assembly and mating of the fixing seat and the alloy sealing gasket 25. Since one end of the alloy sealing gasket 25 passes through the fixing groove 262, it is convenient for the first fixing seat 26 to press the alloy sealing gasket 25 against the step portion 3191, which facilitates the assembly and maintenance of the liquid inlet connector 2.

[0051] In this embodiment, the first fixing seat 26 is made of plastic, and the alloy sealing gasket 25 is tightly fitted with the fixing groove 262. The first fixing seat 26 made of plastic has low production cost and is easy to assemble and disassemble with the alloy sealing gasket 25 and the fixing groove 262.

[0052] The sealing ball 24 is made of ceramic material. Ceramic material sealing ball 24 has high hardness, long service life, and strong corrosion resistance. Under high speed, it can reduce static charge and heat generated by friction, reduce the possibility of material sticking to the ball surface, and help extend the service life of the liquid inlet connector 2.

[0053] In this embodiment, the alloy sealing gasket 25 is a tungsten carbide sealing ring. The tungsten carbide sealing ring is provided with a through hole 251 that connects the first liquid inlet hole 211 and the first mounting cavity 222. A tapered sealing slope 252 is provided at the end of the through hole 251 near the sealing ball 24. The compression spring 23 drives the sealing ball 24 to press against the sealing slope 252. The tungsten carbide sealing ring has high wear resistance, high corrosion resistance and high pressure resistance, which avoids damage to the alloy sealing gasket 25 during use and helps to extend the service life of the liquid inlet connector 2.

[0054] The liquid outlet connector 3 described in this utility model includes a connector body 31, on which a liquid outlet nozzle 311 and a control part 312 are provided. A liquid outlet hole 318 is provided in the liquid outlet nozzle 311. A connecting part 313, which connects to the manifold 1, is provided at the end of the connector body 31 away from the liquid outlet nozzle 311. A second mounting cavity 319 is provided in the connecting part 313. One end of the second mounting cavity 319 communicates with the liquid outlet hole 318, and the other end of the second mounting cavity 319 has an opening. A compression spring 23 and a sealing ball 24 are provided in the second mounting cavity 319. A second fixing seat 32 is detachably provided in the opening. A second liquid inlet hole is provided in the second fixing seat 32. An annular alloy sealing gasket 25 is provided on one side of the second fixing seat 32. The compression spring 23 drives... The sealing ball 24 presses against the alloy sealing gasket 25 to seal the second inlet hole; high-pressure liquid can drive the sealing ball 24 to disengage from the alloy sealing gasket 25, so that the liquid can be discharged from the outlet hole 318 through the second mounting cavity 319. In this structure, the compression spring 23 and the sealing ball 24 are fixed in the second mounting cavity 319 by the second fixing seat 32. The structure is simple and easy to manufacture. During the maintenance of the grouting machine, the outlet connector 3 can be disassembled and installed as a whole, which is convenient for disassembly and maintenance. When the sealing ball 24 and the alloy sealing gasket 25 are worn, the user can replace the sealing ball 24 and the alloy sealing gasket 25 to continue using the outlet connector 3, which helps to reduce the maintenance cost of the outlet connector 3 and extend the service life of the outlet connector 3.

[0055] The compression spring 23, sealing ball 24, and alloy sealing gasket 25 in the preferred liquid inlet connector 2 and liquid outlet connector 3 have the same or similar structures.

[0056] The connecting part 313 has a threaded part 314 on its outer periphery. The manifold 1 has a second fixing hole 14. One end of the second fixing hole 14 has an internal thread 15 that matches the threaded part 314. A sealing groove 315 is provided on the side of the threaded part 314 away from the control part 312. A sealing ring 17 is provided in the sealing groove 315. An annular pressure groove 316 is provided on the side of the sealing groove 315 away from the threaded part 314. A through hole 317 connected to the annular pressure groove 316 is provided on the side wall of the second mounting cavity 319. The sealing ring 17 and the annular pressure groove 316 are both inserted into the second fixing hole 14. A pressure measuring hole 16 connected to the annular pressure groove 316 is provided on the side wall of the second fixing hole 14. A pressure gauge 5 is installed in the pressure measuring hole 16. The annular pressure groove 316 and the pressure measuring hole 16 facilitate the pressure gauge 5 to measure the hydraulic pressure in the second mounting cavity 319, making it convenient for the user. The sealing ring 17 is provided to improve the sealing of the connection between the liquid outlet connector 3 and the second fixing hole 14.

[0057] In this invention, the second mounting cavity 319 extends outward from its side to form a stepped portion 3191, and one end of the fixing seat protrudes from the second mounting cavity 319. The end of the second fixing hole 14 drives the alloy sealing gasket 25 to press against the stepped portion 3191 through the second fixing seat 32, thus fixing the alloy sealing gasket 25 in the second mounting cavity 319. The step portion 3191 facilitates limiting the distance between the alloy sealing gasket 25 and the end of the compression spring 23, thereby determining the initial elastic force of the compression spring 23. This helps to ensure that the minimum pressure of the liquid outlet joint 3 is the same, and the minimum liquid outlet pressure of the grouting machine will not be affected by maintenance or replacement of the liquid outlet joint 3, making it convenient for users. Furthermore, since the end of the second fixing hole 14 drives the alloy sealing gasket 25 to press against the stepped portion 3191 through the second fixing seat 32, it prevents the connection between the second fixing seat 32 and the joint body 31 from becoming loose during use, which is beneficial to the stable installation of the alloy sealing gasket 25.

[0058] Preferably, the second fixing seat 32 is made of plastic. The second fixing seat 32 is tightly fitted with the second mounting cavity 319 and is relatively fixed to the connecting part 313. An inclined guide surface 3192 is provided on the side of the second mounting cavity 319 or the side of the second fixing seat 32. The second fixing seat 32 is guided into the second mounting cavity 319 by the guide surface 3192. The second fixing seat 32 made of plastic is easy to manufacture and has low production cost. The second fixing seat 32 is easy to install and disassemble and can be repeatedly disassembled and installed. This avoids wear on the side walls of the second fixing seat 32 and the second mounting cavity 319 during disassembly, which would affect the use of the second fixing seat 32. The guide surface 3192 facilitates the disassembly and installation of the second fixing seat 32 and facilitates the assembly and maintenance of the liquid outlet connector 3.

[0059] In this embodiment, the second liquid inlet hole and the guide hole 261 have the same structure, and the first fixing seat 26 and the second fixing seat 32 can have the same structure. The guide surface 3192 may not be provided on the outside of the first fixing seat 26. Therefore, only the first fixing seat 26 is shown in the drawings of this utility model specification, but those skilled in the art can realize the second fixing seat 32 therefrom.

[0060] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. An infusion device, comprising a manifold (1), wherein an infusion channel (11) is provided in the manifold (1), and an inlet connector (2) and an outlet connector (3) are respectively provided at both ends of the infusion channel (11), and a plunger cavity (12) is connected in the middle of the infusion channel (11), wherein a plunger rod (4) is movably disposed in the plunger cavity (12), characterized in that: The liquid inlet connector (2) includes a detachably connected liquid inlet nozzle (21) and a connecting seat (22). The connecting seat (22) is detachably connected to the manifold (1). The connecting seat (22) is provided with a connecting hole (221) communicating with the infusion channel (11). The liquid inlet nozzle (21) is provided with a first liquid inlet hole (211). The connecting hole (221) and the liquid inlet are connected through a first mounting cavity (222). The first mounting cavity (222) is provided with a compression spring (23) and a sealing ball (24). The end of the connecting hole (221) is provided with a first fixing seat (26). The first fixing seat (26) is provided with a guide hole (261). The liquid in the first liquid inlet (211) enters the first mounting cavity (222) after passing through the guide hole (261). An annular alloy sealing gasket (25) is fixedly provided on the side of the first fixing seat (26) away from the connecting hole (221). The compression spring (23) drives the sealing ball (24) to press against the alloy sealing gasket (25) and seal the guide hole (261). The high pressure liquid can drive the sealing ball (24) to separate from the alloy sealing gasket (25), so that the liquid can pass through the guide hole (261) and the first mounting cavity (222) and enter the infusion channel (11) and the plunger cavity (12). The first fixing seat (26) is provided with a fixing groove (262) that is adapted to the alloy sealing gasket (25). The fixing groove (262) is connected to the first liquid inlet hole (211), and one end of the alloy sealing gasket (25) passes through the fixing groove (262), so that the end of the mounting hole (212) can be pressed against the step portion (3191) through the first fixing seat (26).

2. The infusion device according to claim 1, characterized in that: The inlet end is provided with an installation hole (212), and the connecting seat (22) is provided with a positioning wall. The connecting seat (22) is threadedly connected to the installation hole (212), and the end of the installation hole (212) can drive the alloy sealing gasket (25) to press against the positioning wall, and fix the alloy sealing gasket (25) in place.

3. An infusion device according to claim 1 or 2, characterized in that: The first fixing seat (26) is made of plastic, and the alloy sealing gasket (25) is tightly fitted with the fixing groove (262).

4. The infusion device according to claim 1, characterized in that: The sealing ball (24) is made of ceramic material.

5. An infusion device according to claim 1, characterized in that: The alloy sealing gasket (25) is a tungsten carbide sealing ring. The tungsten carbide sealing ring is provided with a through hole (251) that connects the first liquid inlet hole (211) and the first mounting cavity (222). A tapered sealing slope (252) is provided at the end of the through hole (251) near the sealing ball (24). The compression spring (23) drives the sealing ball (24) to press against the sealing slope (252).

6. An infusion device according to claim 1, characterized in that: The liquid outlet connector (3) includes a connector body (31), on which a liquid outlet nozzle (311) and a control unit (312) are provided. A liquid outlet hole (318) is provided in the liquid outlet nozzle (311). A connecting part (313) for connecting to the manifold (1) is provided at one end of the connector body (311) away from the liquid outlet nozzle (311). A second mounting cavity (319) is provided in the connecting part (313). One end of the second mounting cavity (319) is connected to the liquid outlet hole (318), and the other end of the second mounting cavity (319) is provided with an opening. A compression spring (23) and a sealing ball (24) are provided in the middle. A second fixing seat (32) is detachably provided in the opening. A second liquid inlet is provided in the second fixing seat (32). An annular alloy sealing gasket (25) is provided on one side of the second fixing seat (32). The compression spring (23) drives the sealing ball (24) to press against the alloy sealing gasket (25) to seal the second liquid inlet. High pressure liquid can drive the sealing ball (24) to separate from the alloy sealing gasket (25), so that the liquid can be discharged from the liquid outlet (318) through the second mounting cavity (319).

7. An infusion device according to claim 6, characterized in that: The connecting part (313) is provided with a threaded part (314) on its outer periphery. The manifold (1) is provided with a second fixing hole (14). One end of the second fixing hole (14) is provided with an internal thread (15) that is adapted to the threaded part (314). A sealing groove (315) is provided on the side of the threaded part (314) away from the control part (312). A sealing ring (17) is provided in the sealing groove (315). An annular pressure groove (316) is provided on the side of the sealing groove (315) away from the threaded part (314). A through hole (317) connected to the annular pressure groove (316) is provided on the side wall of the second mounting cavity (319). The sealing ring (17) and the annular pressure groove (316) are both inserted in the second fixing hole (14). A pressure measuring hole (16) connected to the annular pressure groove (316) is provided on the side wall of the second fixing hole (14). A pressure gauge (5) is installed in the pressure measuring hole (16).

8. An infusion device according to claim 7, characterized in that: The second mounting cavity (319) extends outward to form a step portion (3191) on its side, and one end of the fixing seat protrudes from the second mounting cavity (319). The end of the second fixing hole (14) drives the alloy sealing gasket (25) to press against the step portion (3191) through the second fixing seat (32), and fixes the alloy sealing gasket (25) in the second mounting cavity (319).

9. An infusion device according to claim 8, characterized in that: The second fixing seat (32) is made of plastic. The second fixing seat (32) is tightly fitted with the second mounting cavity (319) and the second fixing seat (32) is fixed relative to the connecting part (313). An inclined guide surface (3192) is provided on the side of the second mounting cavity (319) or the side of the second fixing seat (32). The second fixing seat (32) is guided into the second mounting cavity (319) through the guide surface (3192).

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