Liquid adding injection device and injection system

Abstract

The utility model discloses a liquid adding injection device and an injection system. The injection device comprises a main body, a piston mechanism and a change-over valve, the main body is provided with a liquid storage chamber, an injection chamber and a liquid outlet channel, the liquid storage chamber is communicated with the injection chamber through a first channel, the injection chamber is communicated with the liquid outlet channel through a second channel, and the change-over valve is connected with the main body, so that one of the first channel and the second channel is in a conducting state; the piston mechanism is used for adjusting the space volume of the first sub-chamber, in the first state, the space volume of the first sub-chamber is increased to enable the liquid to enter the injection chamber from the liquid storage chamber, and in the second state, the space volume of the first sub-chamber is reduced to enable the liquid to enter the injection chamber from the liquid storage chamber to enter the injection chamber from the liquid storage chamber. And the liquid enters the liquid outlet channel from the injection cavity. By adopting the integrated structure, the connecting distance of the pipeline is reduced, the problem that bubbles exist in the pipeline is effectively solved, and the liquid quantification precision is improved.

Description

Technical Field

[0001] The utility model relates to a liquid adding injection device and an injection system, belonging to the technical field of medium injection equipment. Background Art

[0002] In the fine chemical, pharmaceutical, related laboratories and emerging flow chemistry industries, there is a great demand for various liquid supply systems (including various pumps and valves). The syringe pump liquid adding system is a liquid adding system widely used in the above industries. Among them, when the syringe pump in the liquid adding system is used alone, the diameter of the pump tube and the plunger is thick and thin, the length is designed, and the wall thickness of the pump tube is thick and thin, so that the displacement of the syringe pump can be large or small, the flow rate can be fast or slow, and the pressure can be high or low. It is a very promising pump type. The commonly used syringe pump currently includes an injection frame and a syringe and a screw mechanism arranged on the injection frame. The syringe structure includes a piston and a liquid cylinder structure. The screw structure converts the rotational motion of the motor into a motion, and connects the piston to realize the suction or ejection of the liquid. At the same time, if a pipeline switching device is connected, continuous and precise delivery of the liquid can be achieved.

[0003] In the fields of medicine, chemical engineering and biopharmaceuticals, liquids passing through syringe pump systems usually need to avoid external contamination and cross-contamination. Before using a syringe pump, it is necessary to undergo preparation procedures such as sterilization, disinfection, cleaning and even verification. The complexity of its use limits the use of syringe pumps.

[0004] In addition, due to the traditional syringe pump liquid filling system, the connection scheme of connecting the syringe pump to the syringe pump through a pipeline, and then the syringe pump to the use equipment. The syringe pump system pipeline is long, especially for more expensive materials, there is a waste problem. In addition, when using the syringe pump, because the inside of the pipeline is filled with air before the syringe pump is used, during use, when the precision syringe pump is extracting liquid, especially when it is used for the first time, it is easy for a small amount of bubbles to mix into the syringe pump cavity. The mixed bubbles will gather at the top edge of the cavity. When draining, the bubbles gathered at the top edge of the cavity will be pushed into the connecting pipe not far from the inlet and outlet after the liquid in the cavity is drained. At the next sampling, it will be drawn into the syringe pump cavity again, causing the remaining bubbles to repeatedly move in the connecting pipe and the syringe pump cavity, and cannot be discharged from the quantitative system. Since air is easily compressed, the quantitative accuracy of the precision syringe pump is reduced. Even if a small amount of bubbles are discharged, the time of bubble discharge is random, which further increases the error of the syringe pump. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a liquid adding injection device and an injection system.

[0006] In order to achieve the above-mentioned utility model purpose, the technical solution adopted by the utility model includes:

[0007] The utility model provides a liquid-adding injection device, which comprises a main body, a piston mechanism and a conversion valve. The main body is provided with a liquid storage chamber, an injection chamber and a liquid outlet channel. The liquid storage chamber is communicated with the injection chamber through a first channel, and the injection chamber is communicated with the liquid outlet channel through a second channel. The conversion valve is connected to the main body and is used to at least make one of the first channel and the second channel in a conducting state while making the other channel in a blocked state. The injection chamber is provided with a first sub-chamber for accommodating the liquid. The piston mechanism is movably connected to the injection chamber to adjust the spatial volume of the first sub-chamber, and there are a first state and a second state. In the first state, the spatial volume of the first sub-chamber is increased so that the liquid enters the injection chamber from the liquid storage chamber. In the second state, the spatial volume of the first sub-chamber is reduced so that the liquid enters the liquid outlet channel from the injection chamber.

[0008] Furthermore, the piston mechanism includes a piston rod and a first piston body, the first piston body is fixed to one end of the piston rod, the first piston body is movably sealed with the inner wall of the injection chamber, the injection chamber is provided with a first opening, and one end of the piston rod relative to the first piston body extends to the outside of the main body through the first opening, and the piston rod is driven by external force to move along its own axial direction to drive the first piston body to move between a first position and a second position in the injection chamber; when the first piston body moves from the second position to the first position, the piston mechanism is in the first state, and when the first piston body moves from the first position to the second position, the piston mechanism is in the second state.

[0009] Furthermore, the diameter of the liquid storage chamber is greater than the diameter of the injection chamber.

[0010] Further, when the piston mechanism is in the first state and the second state, the first opening is formed at the bottom of the injection chamber along the vertical direction, the axial direction of the piston rod is in the vertical direction, and the first passage is formed at the top of the injection chamber along the vertical direction.

[0011] Furthermore, the piston mechanism includes a second piston body, which is movably sealed to the inner wall of the injection chamber, and the first piston body and the second piston body are fixed on the piston rod in sequence along the axial direction of the piston rod, and the distance between the first piston body and the second piston body is not less than the distance between the first position and the second position.

[0012] Furthermore, the main body is provided with a valve chamber, the liquid storage chamber is connected with the valve chamber through a liquid inlet, the injection chamber is connected with the valve chamber through an injection port, the liquid outlet channel is connected with the valve chamber through the liquid outlet, the conversion valve includes a three-way valve core, the three-way valve core is movably sealed with the inner wall of the valve chamber, the three-way valve core rotates around its own axis so that the injection port is connected with the liquid inlet to form the first passage, or the three-way valve core rotates around its own axis so that the liquid outlet is connected with the injection port to form the second passage.

[0013] Furthermore, one end of the three-way valve core extends to the outside of the main body to form a rotation execution part, so that an external force can be applied to the rotation execution part to drive the three-way valve core to rotate around its own axis.

[0014] Furthermore, the rotation executing part is provided with a driving slot, and the driving slot is a groove-like structure formed by an end surface of the rotation executing part away from the main body being recessed inward along its own axial direction.

[0015] Furthermore, it also includes: a cover body, the liquid storage chamber is provided with a second opening, and the cover body is cooperatively connected with the main body to open or close the second opening.

[0016] Furthermore, a hinge portion is provided at one end of the cover body, and the main body is hinged to the hinge portion.

[0017] Furthermore, the cover body is provided with a first end face and a second end face opposite to each other, and the second end face is provided with a plug structure. When the cover body closes the second opening, the plug structure extends into the liquid storage chamber through the second opening and seals with the inner wall of the liquid storage chamber.

[0018] Furthermore, the cover body is provided with a flange structure, and when the cover body closes the second opening, the flange structure protrudes from the outer surface of the main body.

[0019] Furthermore, a baffle is provided on the second end surface opposite to the flange structure, and the baffle is provided around the plug body structure.

[0020] Furthermore, the cover body is provided with a vent which passes through the first end surface and the second end surface, and the cover body is provided with a sterile filtration vent membrane, and the sterile filtration vent membrane covers the vent.

[0021] Furthermore, the liquid adding injection device also includes: a liquid outlet pipeline, the liquid outlet channel is provided with a third opening, one end of the liquid outlet pipeline is cooperatively connected with the third opening, so that the liquid outlet pipeline is in communication with the liquid outlet channel.

[0022] Furthermore, it also includes a conical liquid outlet joint, wherein the end with a larger diameter of the conical liquid outlet joint is connected to one end of the liquid outlet pipeline, and the end with a smaller diameter of the conical liquid outlet joint is plugged into the third opening to connect the liquid outlet pipeline with the liquid outlet channel.

[0023] Furthermore, a plurality of snap-fit ​​structures are provided on the outer side surface of the main body, and the snap-fit ​​structures are provided with snap-fitting spaces, and the snap-fitting spaces can accommodate the fixed snap-fitting of the liquid outlet pipeline.

[0024] Furthermore, the snap-fit ​​structure includes a fixed portion and a clamping portion connected to each other, the fixed portion is fixedly connected to the main body, and the clamping portion, the fixed portion and an outer side surface of the main body form a clamping space.

[0025] Furthermore, the extending directions of the clamping parts in two adjacent clamping structures are opposite.

[0026] Furthermore, the diameter of the liquid outlet pipeline is 0.1-2 mm.

[0027] Furthermore, the main body is an integrally injection-molded plastic structure.

[0028] The utility model also provides an injection system, which includes an automatic injection device and the above-mentioned liquid-adding injection device, the automatic injection device includes a fixing part and a driving mechanism, the fixing part is fixedly connected to the main body, and the driving mechanism cooperates with the piston mechanism to drive the piston mechanism to switch between the first state and the second state.

[0029] Furthermore, the main body is provided with at least two positioning holes along its length direction, and the fixing portion is provided with a positioning column, and the positioning column can be plugged and fixed in cooperation with one of the positioning holes.

[0030] Compared with the prior art, the advantages of the utility model include:

[0031] The utility model adopts an integrated structure setting to replace the traditional split structure of the injection pump liquid filling system, reduces the connection distance of the pipeline, effectively reduces the problem of bubbles in the pipeline, thereby improving the quantitative accuracy of the liquid filling, and also reduces the pipeline residue and waste generated during the liquid filling. In addition, by setting a conversion valve to realize the structure of a one-way valve, and setting a piston mechanism to adjust the pressure difference in the injection chamber to drive the flow of the liquid, the quantitative accuracy of the liquid filling is further improved, and it is easy to control and simple to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 This is a schematic diagram of the structure of an injection device in one embodiment of the utility model;

[0034] Figure 2 It is a schematic cross-sectional structure diagram of a piston mechanism in an injection device in an embodiment of the utility model when it is in a second state;

[0035] Figure 3 yes Figure 2 The enlarged view of point A in the middle;

[0036] Figure 4 yes Figure 3 A schematic cross-sectional view of the piston mechanism in the injection device in the embodiment shown is in the first state;

[0037] Figure 5 yes Figure 1 A schematic structural diagram of the injection device in another perspective of the embodiment shown;

[0038] Figure 6 It is a working principle diagram of the injection device in one embodiment of the utility model.

[0039] Description of reference numerals:

[0040] 100, main body; 110, liquid storage chamber; 111, liquid inlet; 112, second opening; 120, injection chamber; 121, first opening; 122, injection port; 130, liquid outlet channel; 131, liquid outlet; 132, third opening; 140, valve chamber; 150, buckle structure; 151, fixing part; 152, clamping part; 153, clamping space; 160, positioning hole; 200, piston mechanism; 210, piston rod; 220, third opening A piston body; 230, a second piston body; 300, a conversion valve; 310, a three-way valve core; 311, a first channel; 312, a second channel; 313, a rotary actuator; 314, a drive slot; 400, a cover body; 410, a first end face; 420, a second end face; 430, a hinged portion; 440, a plug body structure; 450, a flange structure; 460, a baffle; 470, a sterile filtration breathable membrane; 500, a liquid outlet pipeline; 510, a conical liquid outlet connector. DETAILED DESCRIPTION

[0041] In view of the deficiencies in the prior art, the inventor of this case has proposed the technical solution of the utility model after long-term research and extensive practice. The technical solution, its implementation process and principle will be further explained as follows.

[0042] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0043] In addition, in the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", "horizontal", "vertical", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "an embodiment", "the embodiment", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0045] The technical solution, its implementation process and principle will be further explained below in conjunction with the accompanying drawings.

[0046] Example 1

[0047] See also Figure 1-Figure 6As shown, a liquid adding injection device includes a main body 100, a piston mechanism 200 and a conversion valve 300. The main body 100 is provided with a liquid storage chamber 110, an injection chamber 120, and a liquid outlet channel 130. The liquid storage chamber 110 is connected with the injection chamber 120 through a first passage, and the injection chamber 120 is connected with the liquid outlet channel 130 through a second passage. The conversion valve 300 is connected with the main body 100 and is used to make at least one of the first passage and the second passage in a conducting state while making the other passage in a blocked state. The injection chamber 120 is provided with a first sub-chamber for accommodating liquid. The piston mechanism 200 is movably connected with the injection chamber 120 to adjust the spatial volume of the first sub-chamber, and there are a first state and a second state. In the first state, the spatial volume of the first sub-chamber is increased so that the liquid enters the injection chamber 120 from the liquid storage chamber 110. In the second state, the spatial volume of the first sub-chamber is reduced so that the liquid enters the liquid outlet channel 130 from the injection chamber 120.

[0048] In this embodiment, if Figure 1 , 2As shown in Figure 6, the interior of the main body 100 is provided with a liquid storage chamber 110, an injection chamber 120 and a liquid outlet channel 130 along the vertical direction. The liquid storage chamber 110 is arranged above the injection chamber 120 and the liquid outlet channel 130. The liquid storage chamber 110 can store the required liquid, and the liquid outlet channel 130 can be externally connected to the equipment for injecting the required liquid. The liquid storage chamber 110 and the injection chamber 120 can be connected through a first passage, so that the required liquid can enter the first sub-chamber of the injection chamber 120 through the first passage, and the injection chamber 120 and the liquid outlet channel 130 can be connected through a second passage, so that the liquid in the first sub-chamber of the injection chamber 120 can enter the liquid outlet channel 130. In addition, the conversion valve 300 is connected to the main body 100, and the conversion valve 300 can control the opening and closing of the first passage and the second passage. The piston mechanism 200 is movably connected to the injection chamber 120, and the piston mechanism 200 can move in the injection chamber 120 to be in a first state and a second state respectively, so as to change the spatial volume of the first chamber, and then adjust the pressure difference between the injection chamber 120 and the liquid storage chamber 110 and the liquid outlet channel 130 to drive the flow of liquid, wherein, in the first state, the spatial volume of the first chamber is increased, so that the pressure in the injection chamber 120 is reduced, and a pressure difference is formed between the liquid storage chamber 110 and the injection chamber 120, so that the liquid in the liquid storage chamber 110 enters the injection chamber 120; in the second state, the spatial volume of the first chamber is reduced, so that the pressure in the injection chamber 120 is increased, and a pressure difference is formed between the injection chamber 120 and the liquid outlet channel 130, so that the liquid in the injection chamber 120 enters the liquid outlet channel 130. When in use, a certain amount of liquid to be filled is first stored in the liquid storage chamber 110, and the first passage is opened and the second passage is closed by controlling the conversion valve 300, so that the liquid storage chamber 110 and the injection chamber 120 are connected, and then the piston mechanism 200 is controlled to be in the first state, so that the liquid to be filled can be sucked from the liquid storage chamber 110 into the injection chamber 120, and then the conversion valve 300 is controlled to close the first passage and open the second passage, so that the injection chamber 120 and the liquid outlet channel 130 are connected, and the piston mechanism 200 is controlled to be in the second state, and the liquid to be filled in the injection chamber 120 is pushed into the liquid outlet channel 130, and then filled into the corresponding equipment, thereby completing the filling work.

[0049] In the above structure, a liquid storage chamber 110, an injection chamber 120 and a liquid outlet channel 130 are provided in the main body, and an integrated structural setting is adopted to replace the traditional separate structure of the injection pump liquid filling system, thereby reducing the connecting pipelines between components and the connection distance of the pipelines, and effectively reducing the problem of bubbles in the liquid to be filled caused by the air in the pipeline, thereby improving the quantitative accuracy of the filled liquid and reducing the pipeline residue and waste generated during the filling of the liquid. In addition, by setting the conversion valve 300 to control the alternating conduction of the first passage and the second passage, a one-way valve structure is realized. When the liquid to be filled in the liquid storage chamber 110 is sucked into the injection chamber 120, the first passage is opened and the second passage is closed, which effectively avoids the air in the liquid outlet channel 130 from being sucked into the injection chamber 120, reduces the problem of bubbles generated in the injection chamber 120, and when the liquid to be filled in the injection chamber 120 is injected into the liquid outlet channel 130, the second passage is opened and the first passage is closed, which effectively avoids the problem of inaccurate amount of liquid to be filled caused by the liquid to be filled in the injection chamber 120 flowing back into the liquid storage chamber 110. By setting the piston mechanism 200 to adjust the gas volume in the injection chamber 120 to drive the flow of the liquid, the quantitative accuracy of the liquid to be filled can be further improved, which is convenient for control and simple to operate.

[0050] In the specific structure of the piston mechanism 200, the piston mechanism 200 includes a piston rod 210 and a first piston body 220. The first piston body 220 is fixed at one end of the piston rod 210. The first piston body 220 is movably sealed with the inner wall of the injection chamber 120. The injection chamber 120 is provided with a first opening 121. One end of the piston rod 210 relative to the first piston body 220 extends to the outside of the main body 100 through the first opening 121. The piston rod 210 is driven by external force to move along its own axial direction to drive the first piston body 220 to move between the first position and the second position in the injection chamber 120. When the first piston body 220 moves from the second position to the first position, the piston mechanism 200 is in the first state. When the first piston body 220 moves from the first position to the second position, the piston mechanism 200 is in the second state.

[0051] In this embodiment, if Figure 2 , 3As shown in Figure 4, the injection chamber 120 is a cylindrical chamber structure, the piston column is also a cylindrical shaft structure, and a first piston body 220 is fixedly provided at one end of the piston rod 210. The first piston body 220 is also a cylindrical structure, wherein the piston column, the first piston body 220 and the injection chamber 120 are coaxially arranged, and a first opening 121 is provided at one end of the injection chamber 120. The piston rod 210 drives the first piston body 220 to extend into the injection chamber 120 through the first opening 121, and moves along its axis in the injection chamber 120. It moves between the first position and the second position, and the first piston body 220 and the inner wall of the injection chamber form a first sub-chamber, and one end of the piston rod 210 relative to the first piston body 220 is located outside the main body 100, so as to facilitate driving the piston rod 210 to move, wherein the first position is close to the first opening 121, and the second position is far away from the second opening 112, and the diameter of the first piston body 220 is not less than the diameter of the inner wall of the injection chamber 120, so that the first piston body 220 can achieve a movable seal with the inner wall of the injection chamber 120. When in use, by driving the piston rod 210 located outside the main body 100 to move outward along its axial direction, the first piston body 220 is driven to move from the second position to the first position, the gas volume in the injection chamber 120 increases, the pressure decreases, and a negative pressure is generated in the injection chamber 120, thereby sucking the liquid to be filled in the liquid storage chamber 110 into the injection chamber 120, and then by driving the piston rod 210 to move inward along its axial direction, the first piston body 220 is driven to move from the first position to the second position, the gas volume in the injection chamber 120 decreases, the pressure increases, and a positive pressure is generated in the injection chamber 120, thereby pushing the liquid to be filled in the injection chamber 120 into the liquid outlet channel 130, and the filling operation is realized. By setting the movement of the piston rod 210 and the first piston body 220 to achieve pressure on the injection chamber 120, the structure is simple and easy to operate.

[0052] Specifically, the diameter of the liquid storage chamber 110 is greater than the diameter of the injection chamber 110 .

[0053] In this embodiment, the diameter of the liquid storage chamber 110 is larger than the diameter of the injection chamber 120, so that the volume of the liquid storage chamber 110 is larger than the volume of the injection chamber 120. When adding liquid, it is necessary to push and pull the piston rod multiple times, so as to achieve large-capacity and high-precision liquid addition. Among them, the diameter of the injection chamber can be 2-10mm, and the injection chamber 120 is set as a small-diameter structure, so that the piston area of ​​the first piston body 220 is small, which is about one-tenth of the piston area of ​​a traditional syringe, and higher-precision liquid addition can be achieved, thereby avoiding the contradiction between the traditional disposable liquid-adding syringe, that is, the amount of liquid added is insufficient when using a small syringe, and the accuracy of liquid addition is insufficient when using a large syringe.

[0054] In addition, when the piston mechanism 200 is in the first state and the second state, the first opening 121 is vertically formed at the bottom of the injection chamber 120, the axial direction of the piston rod 210 is vertical, and the first passage is vertically formed at the top of the injection chamber 120.

[0055] In this embodiment, the liquid storage chamber 110 is arranged above the injection chamber 120, the axial direction of the injection chamber 120 is the vertical direction, the first passage is formed at the upper end of the injection chamber 120, the first opening 121 is arranged at the lower end of the injection chamber 120, the piston rod 210 moves in the vertical direction, and the first position is at the lower side of the second position, wherein, when it is necessary to inhale the liquid to be filled from the liquid storage chamber 110, the first passage is opened, and the piston rod 210 is driven to move downward in the vertical direction to drive the first piston body 220 to move from the second position to the first position, and when it is necessary to inject the liquid to be filled in the injection chamber 120 into the liquid outlet channel 130, the second passage is opened, and the piston rod 210 is driven to move upward in the vertical direction to drive the first piston body 220 to move from the first position to the second position. The piston rod 210 and the first piston body 220 are arranged below the injection chamber 120, so that during the initial injection action, when the body fluid to be filled is inhaled, the air in the first passage and the internal hole enters the injection chamber 120 and exists above the injection chamber 120. When the liquid to be filled is injected into the liquid outlet channel 130, the air above the injection chamber 120 is first discharged, effectively avoiding air residue in the pipeline when filling the liquid. The second opening 112 is arranged below the injection chamber 120, which can effectively prevent external sedimentation bacteria from falling into the injection chamber 120 from the second opening 112.

[0056] In addition, the piston mechanism 200 includes a second piston body 230, which is movably sealed to the inner wall of the injection chamber 120. The first piston body 220 and the second piston body 230 are fixed on the piston rod 210 in sequence along the axial direction of the piston rod 210, and the distance between the first piston body 220 and the second piston body 230 is not less than the distance between the first position and the second position.

[0057] In this embodiment, the first piston body 220 and the second piston body 230 are respectively fixed on the piston rod 210, wherein the first piston body 220 is located at one end of the piston rod 210, and the second piston body 230 is arranged at the lower side of the first piston body 220 in the vertical direction, and there is a certain distance between the first piston body 220 and the second piston body 230, wherein the spacing between the first piston body 220 and the second piston body 230 is not less than the stroke distance of the first piston body 220, that is, the distance between the first position and the second position, the second piston body 230 is a cylindrical structure, the first piston body 220, the second piston body 230 and the piston rod 210 are coaxially arranged, and the second piston is connected to the inner portion of the injection chamber 120. The wall is movable and sealed, and the first piston body 220, the second piston body 230 and the inner wall of the injection chamber 120 form a closed space, which is isolated from the outside world. During the initial injection movement, the piston rod 210 drives the first piston body 220 and the second piston body 230 to move from the second position to the first position, and the closed space also moves accordingly. The liquid to be filled enters the injection chamber 120, and the part of the liquid that contacts the inner wall of the injection chamber 120 is the inner wall part of the previous closed space. The inner wall of this part is isolated from the outside world, which effectively avoids the inner wall of the injection chamber 120 being exposed to the outside world and then contacting with the liquid, thereby preventing liquid contamination and avoiding the risk of cross-zone contamination. In addition, a first piston body 220 and a second piston body 230 are arranged on the piston rod 210, and the first piston body 220 and the second piston body 230 are both movably sealed with the inner wall of the injection chamber 120, further ensuring the coaxiality of the piston rod 210 with the injection chamber 120 during movement. The first piston body 220 and the second piston body 230 can achieve a double sealing effect, further protecting the liquid in the injection chamber 120.

[0058] In the specific structure of the conversion valve 300, the main body 100 is provided with a valve chamber 140, the liquid storage chamber 110 is connected to the valve chamber 140 through the liquid inlet 111, the injection chamber 120 is connected to the valve chamber 140 through the injection port 122, and the liquid outlet channel 130 is connected to the valve chamber 140 through the liquid outlet 131. The conversion valve 300 includes a three-way valve core 310, and the three-way valve core 310 is movably sealed with the inner wall of the valve chamber 140. The three-way valve core 310 rotates around its own axis so that the injection port 122 is connected to the liquid inlet 111 to form a first passage, or the three-way valve core 310 rotates around its own axis so that the liquid outlet 131 is connected to the injection port 122 to form a second passage. One end of the three-way valve core 310 extends to the outside of the main body 100 to form a rotation actuator 313, so that an external force can be applied to the rotation actuator 313 to drive the three-way valve core 310 to rotate around its own axis.

[0059] In this embodiment, if Figure 3 , 4As shown, the liquid storage chamber 110 is arranged at the upper inner part of the main body 100 along the vertical direction, the injection chamber 120 and the liquid outlet channel 130 are arranged at the lower side of the liquid storage chamber 110, and the injection chamber 120 and the liquid outlet channel 130 are arranged on opposite sides of the axis of the liquid storage chamber 110, and a valve chamber 140 is provided directly below the liquid storage chamber 110, wherein a liquid inlet 111 is provided at the lower end of the liquid storage chamber 110, and two ends of the liquid inlet 111 are respectively formed on the inner wall of the liquid storage chamber 110 and the inner wall of the valve chamber 140, an injection port 122 is provided at the upper end of the injection chamber 120, and two ends of the injection port 122 are respectively formed on the inner wall of the injection chamber 120 and the inner wall of the valve chamber 140, and a liquid outlet 131 is provided at the upper end of the liquid outlet channel 130, and two ends of the liquid outlet 131 are respectively formed on the inner wall of the liquid outlet channel 130 and the inner wall of the valve chamber 140. One end of the three-way valve core 310 is then set in the valve chamber 140, and the three-way valve core 310 of this part is movably sealed with the inner wall of the valve chamber 140, and the other end of the three-way valve core 310 extends from the main body 100 to the outside to form a rotating actuator 313, and an external force can drive the three-way valve core 310 to rotate through the rotating actuator 313, wherein the interior of the three-way valve core 310 is provided with a first channel 311 and a second channel 312 that are connected to each other, and the three-way valve core 310 can rotate around its own axis in the valve chamber 140. When it is necessary to transfer the liquid to be filled from the liquid storage chamber 110 into the injection chamber 120, the three-way valve core 310 is driven to rotate around its own axis to a set angle, so that the first channel 311 is connected to the injection port 122, and the second channel 312 is connected to the liquid inlet 111. At the same time, the outer wall of the three-way valve core 310 closes the liquid outlet 131. In this state, the liquid storage chamber 110 is connected to the injection chamber 120 through the liquid inlet 111, the second channel 312, the first channel 311 and the injection port 122, thereby forming the first channel 311. A passage; when it is necessary to inject the liquid to be added from the injection chamber 120 into the liquid outlet channel 130, the three-way valve core 310 is rotated around its own axis to another set angle, so that the first channel 311 is connected with the liquid outlet 131, and the second channel 312 is connected with the injection port 122. At the same time, the outer wall of the three-way valve core 310 closes the liquid inlet 111. In this state, the injection chamber 120 is connected with the liquid outlet channel 130 through the injection port 122, the second channel 312, the first channel 311 and the liquid outlet 131.

[0060] In this structure, by setting the first channel 311 and the second channel 312 inside the three-way valve core 310, and by rotating the three-way valve core 310, the first channel 311 and the second channel 312 can be selectively connected to two ports among the liquid inlet 111, the injection port 122, and the liquid outlet 131 respectively, while the other port is in a blocked state, which is convenient to operate and easy to implement.

[0061] Specifically, the rotary actuator 313 is provided with a driving slot 314, which is a groove-shaped structure formed by an end surface of the rotary actuator 313 away from the main body 100 and is recessed inward along its own axial direction. The driving slot 314 is provided on the outer end surface of the rotary actuator 313, and the driving member can be inserted into the driving slot 314. The driving slot 314 provides a limiting effect on the driving member, so that the driving member drives the three-way valve core 310 to rotate. In another embodiment, the rotary actuator 313 can also be provided with a driving protrusion structure, so that the driving protrusion structure cooperates with the corresponding driving member to drive the three-way valve core 310 to rotate.

[0062] In addition, the injection device further comprises a cover body 400, the liquid storage chamber 110 is provided with a second opening 112, and the cover body 400 is connected with the main body 100 to open or close the second opening 112. A hinge part 430 is provided at one end of the cover body 400, and the main body 100 is hinged to the hinge part 430. The cover body 400 is provided with a first end face 410 and a second end face 420 opposite to each other, and the second end face 420 is provided with a plug structure 440. When the cover body 400 closes the second opening 112, the plug structure 440 extends into the liquid storage chamber 110 through the second opening 112 and seals with the inner wall of the liquid storage chamber 110.

[0063] In this embodiment, if Figure 1 , 5 As shown, the upper end of the liquid storage chamber 110 is provided with a second opening 112, and the second opening 112 is communicated with the outside, so as to facilitate the replenishment of liquid into the liquid storage chamber 110 through the second opening 112. In order to further avoid the contamination of the liquid in the liquid storage chamber 110, the main body 100 is also hinged with a cover body 400, the upper end surface of the cover body 400 forms a first end surface 410, and the lower end surface forms a second end surface 420. A plug body structure 440 is provided on the second end surface 420, wherein the plug The extension direction of the plug structure 440 is perpendicular to the extension direction of the second end surface 420, so that when the cover body 400 is rotated to cooperate with the main body 100, the plug structure 440 can extend into the liquid storage chamber 110 through the second opening 112, and seal with the inner wall of the liquid storage chamber 110 to close the second opening 112. When liquid replenishment is needed, the cover body 400 is rotated again to separate the plug structure 440 from the liquid storage chamber 110 to open the second opening 112. This structure can realize liquid replenishment while opening the cover without interrupting the injection of liquid, thereby improving the working efficiency of injection.

[0064] In addition, the cover 400 is provided with a flange structure 450, which protrudes from the outer surface of the main body 100 when the cover 400 closes the second opening 112. A baffle 460 is provided on the second end surface 420 opposite to the flange structure 450, and the baffle 460 is provided around the plug structure 440. A flange structure 450 is provided at the outer edge of the cover body 400, so that the user can apply force to the cover body 400 through the flange structure 450 to facilitate rotating the cover body 400 to open the second opening 112, wherein a baffle 460 is also provided on the second end face 420, and the extension direction of the baffle 460 is consistent with the extension direction of the plug body structure 440, and the baffle 460 is arranged around the plug body structure 440 at the corresponding position of the flange structure 450, that is, the baffle 460 is arranged on the outside of the plug body structure 440, so that when the user rotates the cover body 400 through the flange structure 450, the baffle 460 can effectively prevent fingers or gloves from directly contacting the plug body structure 440, thereby reducing the risk of contamination.

[0065] Specifically, the cover body 400 is provided with a vent that passes through the first end face 410 and the second end face 420, and the cover body 400 is provided with a sterile filtration vent membrane 470, which covers the vent. The sterile filtration vent membrane 470 can ensure that the cover body 400 is closed, and at the same time, the pressure in the liquid storage chamber 110 can be kept stable, and the liquid in the liquid storage chamber 110 can be prevented from being contaminated by the outside world.

[0066] In the specific structure of the liquid outlet channel 130, the injection device further includes a liquid outlet pipeline 500, the liquid outlet channel 130 is provided with a third opening 132, and one end of the liquid outlet pipeline 500 is matched and connected with the third opening 132, so that the liquid outlet pipeline 500 is connected with the liquid outlet channel 130. The injection device also includes a conical liquid outlet joint 510, the end of the conical liquid outlet joint 510 with a larger diameter is connected with one end of the liquid outlet pipeline 500, and the end of the conical liquid outlet joint 510 with a smaller diameter is matched and plugged with the third opening 132, so that the liquid outlet pipeline 500 is connected with the liquid outlet channel 130.

[0067] In this embodiment, if Figure 1 , 2 As shown, the lower end of the liquid outlet channel 130 is provided with a third opening 132, and the liquid outlet pipeline 500 is connected to the third opening 132 through the tapered liquid outlet joint 510, and the liquid in the liquid outlet channel 130 can flow to the corresponding equipment through the liquid outlet pipeline 500. The provision of the liquid outlet pipeline 500 can improve the applicability of the injection device. In terms of the connection structure, the end with a smaller diameter on the tapered liquid outlet joint 510 is inserted into the third opening 132, so as to facilitate plugging.

[0068] In addition, a plurality of buckle structures 150 are provided on the outer side of the main body 100, and the buckle structures are provided with a buckle space 153, and the buckle space 153 can accommodate the fixed buckle of the liquid outlet pipeline. The buckle structure 150 includes a fixed portion 151 and a buckle portion 152 connected to each other, the fixed portion 151 is fixedly connected to the main body 100, and the buckle portion 152, the fixed portion 151 and the outer side of the main body 100 enclose the buckle space 153. The extension directions of the buckle portions 152 in two adjacent buckle structures 150 are opposite.

[0069] In this embodiment, the outer side surface of the main body 100 is provided with a plurality of bayonet structures, wherein the extension direction of the fixing portion 151 of the bayonet structure is perpendicular to the extension direction of the clamping portion 152, one end of the fixing portion 151 is connected to the outer side surface of the main body 100, and the other end is connected to the clamping portion 152, so that the clamping portion 152, the fixing portion 151 and the outer side surface of the main body 100 form a clamping space 153, and an opening is formed on the clamping space 153 at the end opposite to the fixing portion 151, so that the liquid outlet pipeline 500 can be clamped in the clamping space 153 through the opening, thereby facilitating the arrangement of the liquid outlet pipeline 500, making the liquid outlet pipeline 500 neat and orderly, and convenient for storage, wherein the plurality of clamping structures 150 are arranged in sequence along the vertical direction, and the openings of two adjacent clamping structures 150 are arranged in opposite directions, so as to ensure the clamping stability of the liquid outlet pipeline 500.

[0070] The diameter of the liquid outlet pipeline 500 is 0.1-2 mm. The liquid outlet pipeline 500 is a microporous structure, so that the surface tension of the liquid is obvious, so that the air will be discharged preferentially along the liquid outlet pipeline 500, effectively avoiding the influence of air in the subsequent liquid addition process, and improving the accuracy and stability of liquid addition.

[0071] It is particularly important to note that the main body 100 is an integrally injection-molded plastic structure. In the present embodiment, the main body 100 can be an integrally molded structure through an injection molding process. The main body 100 adopts a disposable compact structure and a disposable sterilized non-pyrogenic material, so that the liquid addition action can be easily performed. After the liquid addition or the end of the experiment, there is no need to clean and disinfect, which simplifies the action operation process. Due to the use of disposable materials, the problem of cross contamination can be avoided. Since there is no need for cleaning and disinfection, the experimental time can be greatly shortened and the experimental efficiency is improved. Grouped consumables reduce the connection operation of external pipelines and also reduce the occurrence of verification and risks. The injection device can be used as a disposable consumable. Compared with the traditional stainless steel or glass ceramic injection pump structure, the disposable consumable structure has many advantages such as simple operation, short batch preparation time, high production efficiency, no need for complex pipelines and other ancillary facilities, no need for cleaning and disinfection, low production cost, and easy to pass verification.

[0072] Example 2

[0073] The utility model also provides an injection system, including an automatic injection device and a liquid injection device, the automatic injection device includes a fixing part and a driving mechanism, the fixing part is fixedly connected to a fixed main body 100, and the driving mechanism cooperates with a piston mechanism 200 to drive the piston mechanism 200 to switch between a first state and a second state. The main body 100 is provided with at least two positioning holes 160 along its length direction, and the fixing part is provided with a positioning column, which can be plugged and fixed with a positioning hole 160.

[0074] In this embodiment, the automatic injection device is provided with a fixing part, and a driving mechanism is provided on the fixing part. When in use, a part of the main body 100 is installed on the fixing part, and the piston mechanism 200 is connected with the driving mechanism in cooperation, so that the piston rod 210 is connected with the driving mechanism, and the driving mechanism drives the piston rod 210 to move in the vertical direction, so as to drive the first piston body 220 to move between the first position and the second position, thereby completing the filling work. In addition, at least two positioning holes 160 are provided on the main body 100 along the vertical direction, and a positioning column is provided in the fixing part. When the main body 100 is placed on the fixing part, the positioning column is matched with one of the positioning holes 160 at the corresponding position according to the installation position of the main body 100 and inserted for positioning.

[0075] It should be understood that the above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the utility model.

Claims

1. A liquid injection device, characterized in that: include: A main body, a piston mechanism and a conversion valve, wherein the main body is provided with a liquid storage chamber, an injection chamber and a liquid outlet channel, the liquid storage chamber is connected to the injection chamber through a first passage, and the injection chamber is connected to the liquid outlet channel through a second passage, the conversion valve is connected to the main body, and is used to at least make one of the first passage and the second passage in a conducting state while making the other passage in a blocked state, the injection chamber is provided with a first sub-chamber for accommodating liquid, the piston mechanism is movably connected to the injection chamber to adjust the spatial volume of the first sub-chamber, and there are a first state and a second state, in the first state, the spatial volume of the first sub-chamber is increased, so that the liquid enters the injection chamber from the liquid storage chamber, and in the second state, the spatial volume of the first sub-chamber is reduced, so that the liquid enters the liquid outlet channel from the injection chamber.

2. A liquid adding injection device according to claim 1, characterized in that: The piston mechanism comprises a piston rod and a first piston body, wherein the first piston body is fixed at one end of the piston rod, and the first piston body is movably sealed with the inner wall of the injection chamber, and the injection chamber is provided with a first opening, and one end of the piston rod opposite to the first piston body extends to the outside of the main body through the first opening, and the piston rod is driven to move along its own axial direction by an external force, so as to drive the first piston body to move between a first position and a second position in the injection chamber; When the first piston body moves from the second position to the first position, the piston mechanism is in the first state; when the first piston body moves from the first position to the second position, the piston mechanism is in the second state; And / or, the diameter of the liquid storage chamber is greater than the diameter of the injection chamber.

3. A liquid adding injection device according to claim 2, characterized in that: When the piston mechanism is in the first state and the second state, the first opening is vertically formed at the bottom of the injection chamber, the axial direction of the piston rod is vertical, and the first passage is vertically formed at the top of the injection chamber.

4. A liquid adding injection device according to claim 2, characterized in that: The piston mechanism includes a second piston body, which is movably sealed to the inner wall of the injection chamber. The first piston body and the second piston body are fixed on the piston rod in sequence along the axial direction of the piston rod, and the distance between the first piston body and the second piston body is not less than the distance between the first position and the second position.

5. The liquid adding injection device according to claim 1, characterized in that: The main body is provided with a valve chamber, the liquid storage chamber is communicated with the valve chamber through a liquid inlet, the injection chamber is communicated with the valve chamber through an injection port, the liquid outlet channel is communicated with the valve chamber through a liquid outlet, the conversion valve comprises a three-way valve core, the three-way valve core is movably sealed with the inner wall of the valve chamber, the three-way valve core rotates around its own axis so that the injection port is communicated with the liquid inlet to form the first passage, or the three-way valve core rotates around its own axis so that the liquid outlet is communicated with the injection port to form the second passage; And / or, one end of the three-way valve core extends to the outside of the main body to form a rotation execution part, so that an external force can be applied to the rotation execution part to drive the three-way valve core to rotate around its own axis; And / or, the rotation executing part is provided with a driving slot, and the driving slot is a groove-like structure formed by an end surface of the rotation executing part away from the main body being recessed inward along its own axial direction.

6. A liquid adding injection device according to claim 1, characterized in that: Also includes: A cover body, wherein the liquid storage chamber is provided with a second opening, and the cover body is cooperatively connected with the main body to open or close the second opening; And / or, a hinged portion is provided at one end of the cover, and the main body is hinged to the hinged portion; And / or, the cover body is provided with a first end face and a second end face opposite to each other, the second end face is provided with a plug structure, and when the cover body closes the second opening, the plug structure extends into the liquid storage chamber through the second opening and seals with the inner wall of the liquid storage chamber; And / or, the cover body is provided with a flange structure, and when the cover body closes the second opening, the flange structure protrudes from the outer surface of the main body; And / or, a baffle is arranged on the second end surface opposite to the flange structure, and the baffle is arranged around the plug body structure.

7. A liquid adding injection device according to claim 6, characterized in that: The cover body is provided with a vent which passes through the first end surface and the second end surface, and the cover body is provided with a sterile filtration vent membrane, and the sterile filtration vent membrane covers the vent.

8. The liquid adding injection device according to claim 1, characterized in that: Also includes: A liquid outlet pipeline, wherein the liquid outlet channel is provided with a third opening, and one end of the liquid outlet pipeline is cooperatively connected with the third opening so that the liquid outlet pipeline is in communication with the liquid outlet channel; And / or, it also includes a conical liquid outlet joint, wherein an end of the conical liquid outlet joint with a larger diameter is connected to one end of the liquid outlet pipeline, and an end of the conical liquid outlet joint with a smaller diameter is plugged into the third opening, so that the liquid outlet pipeline is connected to the liquid outlet channel; And / or, the outer side surface of the main body is provided with a plurality of buckle structures, the buckle structures are provided with a clamping space, and the clamping space can accommodate the fixed clamping of the liquid outlet pipeline; And / or, the buckle structure comprises a fixed portion and a clamping portion connected to each other, the fixed portion is fixedly connected to the main body, and the clamping portion, the fixed portion and the outer side surface of the main body form a clamping space; And / or, the extending directions of the clamping parts in two adjacent clamping structures are opposite; And / or, the diameter of the liquid outlet pipeline is 0.1-2 mm.

9. A liquid adding injection device according to any one of claims 1 to 8, characterized in that: The main body is an integrally injection-molded plastic structure.

10. An injection system, characterized in that: include: An automatic injection device and a liquid injection apparatus as claimed in any one of claims 1 to 9, wherein the automatic injection device comprises a fixing portion and a driving mechanism, wherein the fixing portion is fixedly connected to the main body, and the driving mechanism cooperates with the piston mechanism to drive the piston mechanism to switch between the first state and the second state; And / or, the main body is provided with at least two positioning holes along its length direction, and the fixing portion is provided with a positioning column, and the positioning column can be plugged and fixed in cooperation with one of the positioning holes.

Images