Liquid check valve and infusion device

Abstract

The utility model provides a liquid check valve and an infusion device.The liquid check valve comprises a valve body and an elastic membrane, the valve body comprises a liquid inlet part and a liquid outlet part which are connected with each other, a containing cavity is formed in the connecting position of the liquid inlet part and the liquid outlet part, a first channel is formed in the liquid outlet part, and a second channel is formed in the liquid inlet part; the first channel and the second channel are both communicated with the containing cavity, and the liquid outlet part is further provided with a first protrusion facing the liquid inlet part in the protruding direction. The elastic membrane is arranged in the containing cavity, the first protrusion abuts against the first portion of the elastic membrane, the channel tail end, close to the first channel, of the second channel abuts against the second portion of the elastic membrane, and the second portion surrounds the first portion. According to the scheme, the liquid check effect can be improved on the premise that the structural complexity of the liquid check valve is reduced as much as possible.

Description

Technical Field

[0001] The present application relates to the technical field of medical equipment, and in particular to a liquid check valve and an infusion device. Background Art

[0002] Infusion equipment is currently widely used in clinical practice. Medical staff use infusion equipment and infusion lines to inject liquid medicine into patients.

[0003] To prevent liquid backflow during infusion interruptions, conventional technology requires installing a check clamp on the infusion line during infusion pauses. This clamp compresses the line and stops the flow of liquid. However, the use of the check clamp requires manual operation, which can lead to slow installation, partial clamping, or even complete failure to clamp the line, causing liquid backflow within the infusion line. Failure to install the check clamp in a timely manner can even result in bleeding back into the patient. Therefore, improving the liquid check valve's effectiveness while minimizing the structural complexity of the check valve has become a pressing issue. Utility Model Content

[0004] The main technical problem solved by the present application is to provide a liquid check valve and an infusion device, which can improve the liquid check effect while reducing the structural complexity of the liquid check valve as much as possible.

[0005] In order to solve the above-mentioned technical problems, the first aspect of the present application provides a liquid check valve, including a valve body and an elastic diaphragm, the valve body including a liquid inlet and a liquid outlet connected to each other, a accommodating chamber is formed at the connection between the liquid inlet and the liquid outlet, a first channel is provided in the liquid outlet, and a second channel is provided in the liquid inlet, the first channel and the second channel are both connected to the accommodating chamber, and the liquid outlet is also provided with a first protrusion with the protrusion direction facing the liquid inlet; the elastic diaphragm is arranged in the accommodating chamber, and the first protrusion abuts against the first part of the elastic diaphragm, and the channel end of the second channel close to the first channel abuts against the second part of the elastic diaphragm, and the second part surrounds the first part.

[0006] The beneficial effects of the present application are as follows: different from the prior art, the liquid check valve provided by the present application is provided with a valve body and an elastic diaphragm, the valve body includes a liquid inlet and a liquid outlet connected to each other, a first channel is provided in the liquid outlet, a second channel is provided in the liquid inlet, and an accommodating chamber is formed at the connection between the liquid inlet and the liquid outlet, the first channel and the second channel are both connected to the accommodating chamber, thereby forming a liquid flow passage, and the liquid outlet is further provided with a first protrusion with a protruding direction facing the liquid inlet, the elastic diaphragm is provided in the accommodating chamber, and the first protrusion abuts against the first part of the elastic diaphragm, the channel end of the second channel close to the first channel abuts against the second part of the elastic diaphragm, and the second part surrounds the first part, so that when the liquid flows from the liquid inlet to the liquid outlet, the liquid flow is generated by Pressure from the liquid inlet to the liquid outlet is applied to the elastic diaphragm. Because the second portion of the elastic diaphragm surrounds the first portion, the area of ​​the outer ring of the elastic diaphragm not abutted by the first boss deforms in the same direction as the pressure. Therefore, after the elastic diaphragm deforms, liquid flows from the second channel to the accommodating chamber and then out of the first channel. When liquid refluxes, that is, when liquid flows from the liquid outlet to the liquid inlet, the liquid flow generates pressure from the liquid outlet to the liquid inlet and applies it to the elastic diaphragm. Because the second portion of the elastic diaphragm surrounds the first portion, the liquid inlet provides support for the elastic diaphragm, so that the second portion of the elastic diaphragm does not deform after abutting against the end of the second channel near the first channel, thereby blocking the passage between the second channel and the accommodating chamber and preventing liquid backflow. In addition, because the check valve is directly located at the connection between the liquid inlet and the liquid outlet, compared to a check valve located outside the connection between the liquid inlet and the liquid outlet, the assembly difficulty of the check valve is reduced, and the passage distance during liquid backflow is shortened, thereby reducing the flow rate of the backflowing liquid. Therefore, the liquid check effect can be improved while reducing the structural complexity of the liquid check valve as much as possible.

[0007] The first protrusion is in the shape of a cone or a boss.

[0008] Therefore, while improving the liquid check effect, the complexity of the valve body structure can be reduced.

[0009] Wherein, the number of the first protrusion is at least one.

[0010] Therefore, the structure of the valve body is diverse and can meet as many application scenarios as possible.

[0011] Wherein, a second protrusion is provided at the end of the second channel close to the first channel, with the protrusion direction facing the liquid outlet. The second protrusion abuts against the second portion of the elastic diaphragm, and the shape of the second portion is annular.

[0012] Therefore, when the liquid refluxes, that is, the liquid flows to the liquid inlet through the liquid outlet, the liquid flow generates pressure in the direction from the liquid outlet to the liquid inlet and applies it to the elastic diaphragm. Since the second part of the elastic diaphragm surrounds the first part, the liquid inlet provides a supporting force for the elastic diaphragm, so that the second part of the elastic diaphragm does not deform after it presses against the end of the second channel close to the first channel, thereby blocking the passage between the second channel and the accommodating chamber and preventing liquid reflux. The second protrusion is in a ring shape and presses against the elastic diaphragm, thereby improving the uniformity of the force applied to the elastic diaphragm, preventing the elastic diaphragm from displacement, and improving the effect of liquid non-return.

[0013] Among them, the second channel is provided with a second protrusion at the end of the channel close to the first channel, with the protrusion direction facing the liquid outlet. The second protrusion presses against the second part of the elastic diaphragm, and the second part is formed by a combination of multiple sub-parts, and the multiple sub-parts are arranged in a ring.

[0014] Therefore, when the liquid refluxes, that is, the liquid flows to the liquid inlet through the liquid outlet, the liquid flow generates pressure in the direction from the liquid outlet to the liquid inlet and applies it to the elastic diaphragm. Since the second part of the elastic diaphragm surrounds the first part, the liquid inlet provides a supporting force for the elastic diaphragm, so that the second part of the elastic diaphragm does not deform after it presses against the end of the second channel close to the first channel, thereby blocking the passage between the second channel and the accommodating chamber and preventing liquid reflux. The second protrusion is in a ring shape and presses against the elastic diaphragm, thereby improving the uniformity of the force applied to the elastic diaphragm, preventing the elastic diaphragm from displacement, and improving the effect of liquid non-return.

[0015] The first protrusion is a cone, and a plurality of first protrusions are arranged in a ring and abut against the first portion of the elastic diaphragm.

[0016] Therefore, the plurality of first protrusions arranged in an annular pattern and abutting against the first portion of the elastic diaphragm can reduce the difficulty of assembling the liquid check valve.

[0017] The end of the second channel close to the first channel is arranged in a ring and presses against the second part of the elastic diaphragm, and the center point of the ring of the first part and the center point of the ring of the second part are located at the same point.

[0018] Therefore, the elastic diaphragm can be subjected to the pressure generated by the uniform liquid flow, thereby preventing the elastic diaphragm from being displaced and improving the liquid check effect.

[0019] The joint between the liquid inlet and the liquid outlet is sealed.

[0020] Therefore, a liquid circulation passage is formed, thereby improving the effect of liquid circulation.

[0021] In order to solve the above technical problems, the second aspect of the present application provides an infusion device, including a liquid inlet tube, a liquid outlet tube and the liquid check valve of the first aspect above, one end of the liquid inlet tube is connected to the liquid inlet part of the liquid check valve and forms a liquid medicine flow path, and one end of the liquid outlet tube is connected to the liquid outlet part of the liquid check valve and forms a liquid medicine flow path.

[0022] Therefore, one end of the liquid inlet pipe is connected to the liquid inlet part of the liquid check valve and a liquid flow passage is formed therein, and one end of the liquid outlet pipe is connected to the liquid outlet part of the liquid check valve and a liquid flow passage is formed therein. When the liquid flows from the liquid inlet part to the liquid outlet part, the liquid flow generates pressure in the direction from the liquid inlet part to the liquid outlet part and is applied to the elastic diaphragm. Since the second portion of the elastic diaphragm surrounds the first portion, the area of ​​the outer ring of the elastic diaphragm that is not pressed by the first boss is deformed in the same direction as the pressure. Therefore, after the elastic diaphragm is deformed, the liquid flows from the second channel to the accommodating chamber and then out of the first channel. When the liquid refluxes, that is, the liquid flows from the liquid outlet part to the liquid inlet part, the liquid flow generates pressure in the direction from the liquid outlet part to the liquid inlet part and is applied to the elastic diaphragm. Since the second portion of the elastic diaphragm surrounds the first portion, the liquid inlet part provides support force for the elastic diaphragm, so that the second portion of the elastic diaphragm does not deform after pressing against the channel end of the second channel close to the first channel, thereby blocking the passage between the second channel and the accommodating chamber and preventing liquid reflux. Furthermore, since the check valve is directly located at the connection between the inlet and outlet, compared to a check valve located elsewhere, it simplifies assembly of the check valve and shortens the path distance for liquid backflow, thereby reducing the flow rate of the backflowing liquid. Therefore, the check valve can improve the liquid backflow prevention effect within the infusion device while minimizing the assembly complexity of the infusion device.

[0023] The liquid inlet pipe and the liquid inlet portion of the liquid check valve are integrally formed, and the liquid outlet pipe and the liquid outlet portion of the liquid check valve are integrally formed.

[0024] Therefore, the liquid inlet pipe and the liquid outlet pipe are respectively integrally formed with the liquid check valve, which can reduce the difficulty of assembling the infusion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of this application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be derived from these drawings without inventive effort. Among them:

[0026] Figure 1 This is a structural diagram of an embodiment of the liquid check valve of the present application;

[0027] Figure 2 This is a structural diagram of another embodiment of the liquid check valve of the present application;

[0028] FIG3 (a) is a schematic top view of an embodiment of a first boss of a liquid check valve of the present application;

[0029] FIG3 ( b ) is a structural diagram of an embodiment of the first boss of the liquid check valve of the present application;

[0030] Figure 4 This is a structural diagram of another embodiment of the first boss of the liquid check valve of the present application;

[0031] Figure 5 It is a structural schematic diagram of an embodiment of the infusion device of the present application. DETAILED DESCRIPTION

[0032] The following is a clear and complete description of the technical solutions in the embodiments of this application in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] Please refer to Figure 1 and Figure 2 , Figure 1 This is a structural diagram of an embodiment of the liquid check valve 10 of the present application. Figure 2 FIG. 1 is a structural diagram of another embodiment of the liquid check valve 10 of the present application. Figure 1 and Figure 2 As shown, Figure 2The middle dotted line represents the direction of liquid flow. The liquid check valve 10 includes a valve body 11 and an elastic diaphragm 12. When the liquid flows from the liquid inlet 111 to the liquid outlet 112, the liquid flow generates pressure from the liquid inlet 111 to the liquid outlet 112 and applies it to the elastic diaphragm 12. Since the second portion of the elastic diaphragm 12 surrounds the first portion, the area of ​​the outer ring of the elastic diaphragm 12 that is not supported by the first boss is deformed in the same direction as the pressure. Therefore, after the elastic diaphragm 12 is deformed, the liquid flows from the second channel D2 to the accommodating chamber R1 and then flows out of the second channel D2. When liquid backflows through channel D1, i.e., flows from the liquid outlet 112 to the liquid inlet 111, the liquid flow generates pressure from the liquid outlet 112 to the liquid inlet 111, which is applied to the elastic diaphragm 12. Because the second portion of the elastic diaphragm 12 surrounds the first portion, the liquid inlet 111 provides support for the elastic diaphragm 12, preventing the second portion of the elastic diaphragm 12 from deforming after contacting the end of the second channel D2 near the first channel D1. This blocks the passage between the second channel D2 and the accommodating chamber R1, preventing liquid backflow. Furthermore, since the check valve is directly located at the junction of the liquid inlet 111 and the liquid outlet 112, compared to a check valve located outside the junction of the liquid inlet 111 and the liquid outlet 112, the assembly difficulty of the check valve is reduced, and the distance of the passageway during liquid backflow is shortened, thereby reducing the flow rate of the backflowing liquid. Therefore, the liquid check valve 10 can improve its liquid backflow prevention effect while minimizing the structural complexity.

[0034] In one implementation scenario, the valve body 11 includes a liquid inlet 111 and a liquid outlet 112 connected to each other. The material of the valve body 11 is not limited in this application, such as metal, plastic, rubber, composite material, etc., and the materials of the liquid inlet 111 and the liquid outlet 112 can be the same or different. A accommodating cavity R1 is formed at the connection between the liquid inlet 111 and the liquid outlet 112, a first channel D1 is provided in the liquid outlet 112, and a second channel D2 is provided in the liquid inlet 111. The first channel D1 and the second channel D2 are both connected. The liquid flows into the accommodating chamber R1 from the liquid inlet 111 of the valve body 11, passes through the second channel D2, the accommodating chamber R1 and the first channel D1 in sequence, and flows out of the liquid outlet 112. The liquid outlet 112 is further provided with a first protrusion T1 with the protrusion direction facing the liquid inlet 111. The elastic diaphragm 12 is disposed in the accommodating chamber R1, and the first protrusion T1 abuts against a first portion of the elastic diaphragm 12. The channel end of the second channel D2 close to the first channel D1 abuts against a second portion of the elastic diaphragm 12, and the second portion surrounds the first portion.

[0035] In one implementation scenario, the elastic diaphragm 12 is made of rubber, silicone, elastic composite materials, etc., and can produce a certain amount of deformation under a certain pressure. It is understandable that the elastic diaphragm 12 can produce deformation consistent with the flow direction under the pressure exerted by the liquid flow.

[0036] In a specific implementation scenario, the selection of the material of the elastic diaphragm 12 can be determined based on information such as the flow rate of the liquid, the diameter of the first channel D1, and the diameter of the second channel D2. For example, in an application scenario with a relatively high flow rate, the elastic diaphragm 12 can be made of a material with a larger deformation pressure threshold. In an application scenario with a relatively low flow rate, the elastic diaphragm 12 can be made of a material with a smaller deformation pressure threshold. It should be noted that the above embodiment is only one possible implementation method, and the material of the elastic diaphragm 12 is not limited in this application.

[0037] In one implementation scenario, the shape of the elastic diaphragm 12 is circular, square, elliptical, etc. Specifically, the shape of the elastic diaphragm 12 is consistent based on the outer edge shape of the cross-section of the channel end of the second channel D2 close to the first channel D1, and the size of the elastic diaphragm 12 is set based on the cross-section of the channel end of the second channel D2 close to the first channel D1. For example, the outer edge shape of the cross-section of the channel end of the second channel D2 close to the first channel D1 is circular, and the shape of the elastic diaphragm 12 is set to a circular diaphragm with a uniform diameter, which can avoid as much as possible the elastic diaphragm 12 from undergoing a large displacement in the accommodating cavity R1 to affect the non-return effect.

[0038] In one implementation scenario, the liquid outlet 112 is further provided with a first protrusion T1 with its protruding direction facing the liquid inlet 111. It should be noted that the material of the first protrusion T1 may be consistent with or inconsistent with the material of the liquid outlet 112, which is not limited in this application.

[0039] In one implementation scenario, the shape of the first protrusion T1 is any one of a cone and a boss. Specifically, the cone includes three-dimensional figures including cones, prisms, etc., which are defined by a circular or other closed plane base and a surface formed by line segments connecting each point on the boundary of the base to a common vertex. The shape of the boss can be a U-shaped boss, a cylindrical boss, etc., which can reduce the complexity of the valve body 11 structure while improving the liquid check effect.

[0040] In one implementation scenario, the number of the first protrusion T1 is at least one, and the structure of the valve body 11 is diverse, which can meet as many application scenarios as possible.

[0041] In a specific implementation scenario, when the first protrusion T1 is a cone, the top of the cone abuts against the first portion of the elastic diaphragm 12. Specifically, when there is only one cone, the first portion abutted by the top of the cone is located at the center point of the elastic diaphragm 12. When the liquid flows from the second channel D2 to the first channel D1, the elastic diaphragm 12 is subjected to uniform force, which can prevent the elastic diaphragm 12 from undergoing a large displacement within the accommodating chamber R1. When there are multiple first protrusions T1, the first portions abutted by the tops of the cones are symmetrical about the center point of the elastic diaphragm 12. When the liquid flows from the second channel D2 to the first channel D1, the elastic diaphragm 12 is subjected to uniform force, which can prevent the elastic diaphragm 12 from undergoing a large displacement within the accommodating chamber R1. It will be understood that the above-mentioned arrangement of the first protrusion T1 is only a preferred embodiment, and the specific arrangement of the first protrusion T1 is not limited in this application.

[0042] In a specific implementation scenario, when the first protrusion T1 is a boss, the top surface of the boss in the protruding direction abuts against the first part of the elastic diaphragm 12. Specifically, when the number of bosses is one, the center point of the first part abutted by the top surface of the boss is consistent with the center point of the elastic diaphragm 12. When the liquid flows from the second channel D2 to the first channel D1, the elastic diaphragm 12 is subjected to uniform force, which can prevent the elastic diaphragm 12 from undergoing a large displacement in the accommodating chamber R1. When the number of first protrusions T1 is multiple, the first part abutted by the top surface of each boss is symmetrical about the center point of the elastic diaphragm 12. When the liquid flows from the second channel D2 to the first channel D1, the elastic diaphragm 12 is subjected to uniform force, which can prevent the elastic diaphragm 12 from undergoing a large displacement in the accommodating chamber R1. Or when the number of a protrusion is multiple and the top surfaces of each boss are not completely consistent, the center point of the first part abutted by the top surface of each boss is symmetrical about the center point of the elastic diaphragm 12. It can be understood that the above-mentioned arrangement of the first protrusion T1 is only a preferred embodiment, and the specific arrangement of the first protrusion T1 is not limited in this application.

[0043] Please refer to Figures 3(a) and 3(b) in conjunction. Figure 3(a) is a schematic top view of an embodiment of the first boss T1 of the liquid check valve 10 of the present application, and Figure 3(b) is a schematic structural view of an embodiment of the first boss T1 of the liquid check valve 10 of the present application. As shown in Figures 3(a) and 3(b), in a specific implementation scenario, when there are multiple first bosses T1, the first bosses T1 may include a plurality of cones and a plurality of bosses. As one possible embodiment, the center points of the first portion abutted by the apex of each cone and the first portion abutted by the top surface of each boss are symmetrical about the center point of the elastic diaphragm 12.

[0044] Please refer to Figure 4 , Figure 4This is a structural diagram of another embodiment of the first boss T1 of the liquid check valve 10 of the present invention. Figure 4 As shown, in a specific implementation scenario, when the number of first protrusions T1 is one, a mounting portion is provided on the first protrusion T1 away from the protrusion direction, and the mounting portion is fixedly connected to the channel end of the first channel D1 of the liquid outlet portion 112 close to the second channel D2. Specifically, when the mounting portion blocks the channel end of the first channel D1 of the liquid outlet portion 112 close to the second channel D2, the mounting portion shell is provided with at least one through hole for connecting the accommodating cavity R1 and the first channel D1, or, when the mounting portion is provided in the cross-section of the channel end of the first channel D1 close to the second channel D2 and does not block the channel end of the first channel D1 of the liquid outlet portion 112, the liquid outlet portion 112 further includes a mounting surface, the mounting portion of the first protrusion T1 is installed on the mounting surface of the liquid outlet portion 112, and the mounting surface of the liquid outlet portion 112 is provided with at least one through hole for connecting the accommodating cavity R1 and the first channel D1. Alternatively, the mounting portion is arranged on one side of the channel end of the first channel D1 of the liquid outlet portion 112. The mounting portion shell may have a through hole, or may not have a through hole and rely on the other side of the channel end of the first channel D1 of the liquid outlet portion 112 to connect the accommodating cavity R1 and the first channel D1.

[0045] In a specific implementation scenario, the first protrusion T1 is a cone, and several first protrusions T1 are arranged in a ring and abut against the first part of the elastic diaphragm 12. Several first protrusions T1 arranged in a ring and abut against the first part of the elastic diaphragm 12 can reduce the difficulty of assembling the liquid check valve 10.

[0046] In one implementation scenario, the housing of the second channel D2 of the liquid inlet portion 111 close to the channel end of the first channel D1 presses against the second portion of the elastic diaphragm 12 .

[0047] In a specific implementation scenario, the cross section of the shell of the second channel D2 of the liquid inlet portion 111 close to the channel end of the first channel D1 is an annular surface with a certain width to abut against the elastic diaphragm 12 .

[0048] In another implementation scenario, a second protrusion T2 facing the liquid outlet 112 is provided at the end of the second channel D2 close to the first channel D1 , and the second protrusion T2 abuts against the second portion of the elastic diaphragm 12 .

[0049] In a specific implementation scenario, the second protrusion T2 is in the shape of a boss, and the number of the second protrusion T2 is at least one.

[0050] In a specific implementation scenario, a second protrusion T2 is provided at the channel end of the second channel D2 near the first channel D1, with the protrusion direction facing the liquid outlet portion 112. The second protrusion T2 abuts against the second portion of the elastic diaphragm 12, and the second portion is annular in shape. Specifically, the second protrusion T2 is an annular boss. When liquid refluxes, that is, when the liquid flows from the liquid outlet portion 112 to the liquid inlet portion 111, the liquid flow generates pressure in the direction from the liquid outlet portion 112 to the liquid inlet portion 111 and applies it to the elastic diaphragm 12. Since the second portion of the elastic diaphragm 12 surrounds the first portion, the liquid inlet portion 111 provides support for the elastic diaphragm 12, so that the second portion of the elastic diaphragm 12 does not deform after abutting against the channel end of the second channel D2 near the first channel D1, thereby blocking the passage between the second channel D2 and the accommodating chamber R1 and preventing liquid reflux. The second protrusion T2 is annular in shape and abuts against the elastic diaphragm 12, thereby improving the uniformity of the force applied to the elastic diaphragm 12, preventing displacement of the elastic diaphragm 12, and improving the liquid check effect.

[0051] In another specific implementation scenario, the second part is formed by a combination of multiple sub-parts, and the multiple sub-parts are arranged in a ring. When the liquid refluxes, that is, the liquid flows to the liquid inlet 111 through the liquid outlet 112, the liquid flow generates pressure in the direction from the liquid outlet 112 to the liquid inlet 111 and is applied to the elastic diaphragm 12. Since the second part of the elastic diaphragm 12 surrounds the first part, the liquid inlet 111 provides support for the elastic diaphragm 12, so that the second part of the elastic diaphragm 12 does not deform after it presses against the channel end of the second channel D2 close to the first channel D1, blocking the passage between the second channel D2 and the accommodating chamber R1, preventing liquid reflux, and the second protrusion T2 is in a ring shape and presses against the elastic diaphragm 12, thereby improving the uniformity of the force applied to the elastic diaphragm 12, preventing the elastic diaphragm 12 from displacement, and improving the liquid check effect.

[0052] In a specific implementation scenario, the shape of each sub-part is not limited in this application. For example, the sub-part can be any one of a triangle, trapezoid, rectangle, and arc, and the shape and size of each sub-part can be the same or different.

[0053] In a specific implementation scenario, a plurality of second protrusions T2 facing the liquid outlet 112 are provided at the end of the second channel D2 close to the first channel D1, and the heights of the second protrusions T2 are consistent.

[0054] It should be noted that any of the above embodiments regarding the first protrusion T1 and the second protrusion T2 can be arbitrarily combined to form the valve body 11 described in this application. For the sake of simplicity, the specific structure can be referred to the above embodiments and will not be repeated here.

[0055] In one implementation scenario, the channel end of the second channel D2 close to the first channel D1 is arranged in a ring and presses against the second part of the elastic diaphragm 12, and the ring center point of the first part and the ring center point of the second part are located at the same point. The elastic diaphragm 12 can receive the pressure generated by the uniform liquid flow, prevent the elastic diaphragm 12 from displacement, and enhance the liquid check effect.

[0056] In one implementation scenario, the joint between the liquid inlet portion 111 and the liquid outlet portion 112 is sealed to form a liquid flow passage, thereby improving the effect of liquid flow.

[0057] In a specific implementation scenario, the liquid inlet portion 111 and the liquid outlet portion 112 are fixedly connected, and the connection method can be threaded connection, welding, riveting, bonding, snap connection, etc. Specifically, the liquid inlet portion 111 and the liquid outlet portion 112 can be bonded into one based on UV glue.

[0058] In the above solution, when the liquid flows from the liquid inlet 111 to the liquid outlet 112, the liquid flow generates pressure from the liquid inlet 111 to the liquid outlet 112 and applies it to the elastic diaphragm 12. Since the second portion of the elastic diaphragm 12 surrounds the first portion, the outer ring of the elastic diaphragm 12 is deformed in the area not supported by the first boss in the same direction as the pressure. Therefore, after the elastic diaphragm 12 is deformed, the liquid flows from the second channel D2 to the accommodating chamber R1 and then flows out of the first channel D1. When the liquid flows back, that is, the liquid When the liquid flows from the liquid outlet 112 to the liquid inlet 111, the flow generates pressure from the liquid outlet 112 to the liquid inlet 111, which is applied to the elastic diaphragm 12. Because the second portion of the elastic diaphragm 12 surrounds the first portion, the liquid inlet 111 provides support for the elastic diaphragm 12, so that the second portion of the elastic diaphragm 12 does not deform after abutting against the end of the second channel D2 near the first channel D1, thereby blocking the passage between the second channel D2 and the accommodating chamber R1 and preventing liquid backflow. In addition, because the check valve is directly connected to the liquid inlet 111 and the liquid outlet 112, compared to a check valve located outside the connection between the liquid inlet 111 and the liquid outlet 112, the assembly difficulty of the check valve is reduced, and the path distance of the liquid backflow is shortened, thereby reducing the flow rate of the backflowing liquid. Therefore, the liquid check valve 10 can improve its liquid backflow prevention effect while minimizing the structural complexity.

[0059] See also Figure 5 , Figure 5 Schematic diagram of the structure of an embodiment of the infusion device 20 of the present application. Figure 5As shown, the infusion device 20 includes a liquid inlet tube 21, a liquid outlet tube 22 and the liquid check valve 10 of the first aspect mentioned above. One end of the liquid inlet tube 21 is connected to the liquid inlet part 111 of the liquid check valve 10 and forms a liquid medicine circulation passage. One end of the liquid outlet tube 22 is connected to the liquid outlet part 112 of the liquid check valve 10 and forms a liquid medicine circulation passage.

[0060] In one implementation scenario, the liquid check valve 10 includes a valve body 11 and an elastic diaphragm 12, one end of the liquid inlet pipe 21 is connected to the liquid inlet portion 111 of the liquid check valve 10 and forms a liquid flow passage, and one end of the liquid outlet pipe 22 is connected to the liquid outlet portion 112 of the liquid check valve 10 and forms a liquid flow passage. When the liquid flows from the liquid inlet portion 111 to the liquid outlet portion 112, the liquid flow generates pressure from the liquid inlet portion 111 to the liquid outlet portion 112 and applies it to the elastic diaphragm 12. Since the second portion of the elastic diaphragm 12 surrounds the first portion, the outer ring of the elastic diaphragm 12 is deformed in the area not pressed by the first boss in the direction of the pressure. Therefore, after the elastic diaphragm 12 deforms, the liquid flows from the second channel D2 to the accommodating chamber R1 and then out of the first channel D1. When the liquid flows back, that is, when the liquid flows through the liquid outlet 112 to the liquid inlet 111, the liquid flow generates pressure from the liquid outlet 112 to the liquid inlet 111 and applies it to the elastic diaphragm 12. Because the second portion of the elastic diaphragm 12 surrounds the first portion, the liquid inlet 111 provides support for the elastic diaphragm 12, so that the second portion of the elastic diaphragm 12 does not deform after it contacts the end of the second channel D2 near the first channel D1, blocking the passage between the second channel D2 and the accommodating chamber R1 and preventing liquid backflow. Therefore, the liquid check valve 10 can improve the liquid check effect in the infusion device 20 while minimizing the structural complexity of the liquid check valve 10.

[0061] In one implementation scenario, the materials used to make the liquid inlet pipe 21 and the liquid outlet pipe 22 are not limited in this application, for example, PVC material, PE material, PP material, etc., and the liquid inlet pipe 21 and the liquid outlet pipe 22 are respectively sealed and connected to the liquid check valve 10.

[0062] In a specific implementation scenario, the liquid inlet pipe 21 and the liquid outlet pipe 22 are respectively connected to the liquid check valve 10 by threaded connection, welding, riveting, bonding, snap connection, etc. Specifically, they can be bonded into one body based on UV glue.

[0063] In a specific implementation scenario, the liquid inlet pipe 21 is integrally formed with the liquid inlet portion 111 of the liquid check valve 10, and the liquid outlet pipe 22 is integrally formed with the liquid outlet portion 112 of the liquid check valve 10, which can improve the sealing between the infusion pipeline and the liquid check valve 10, increase the service life of the infusion device 20 and reduce the difficulty of assembling the infusion device 20.

[0064] In a specific implementation scenario, the liquid check valve 10 can be installed at one end of the infusion device 20 close to the liquid outlet tube 22, reducing the difficulty of assembling the check valve and shortening the path distance when the liquid refluxes, thereby reducing the flow rate of the reflux liquid.

[0065] The above description is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A liquid check valve, characterized in that: include: The valve body includes a liquid inlet and a liquid outlet connected to each other, wherein a receiving cavity is formed at the connection between the liquid inlet and the liquid outlet, a first channel is provided in the liquid outlet, and a second channel is provided in the liquid inlet, wherein both the first channel and the second channel are connected to the receiving cavity, and the liquid outlet is further provided with a first protrusion with a protrusion direction facing the liquid inlet; The elastic diaphragm is arranged in the accommodating cavity, and the first protrusion presses against the first part of the elastic diaphragm, the channel end of the second channel close to the first channel presses against the second part of the elastic diaphragm, and the second part surrounds the first part.

2. The liquid check valve according to claim 1, characterized in that: The first protrusion is in a shape of a cone or a boss.

3. The liquid check valve according to claim 1, characterized in that: The number of the first protrusion is at least one.

4. The liquid check valve according to claim 1, characterized in that: A second protrusion is provided at the end of the second channel close to the first channel, with the protrusion facing the liquid outlet. The second protrusion abuts against the second portion of the elastic diaphragm, and the second portion is annular in shape.

5. The liquid check valve according to claim 1, characterized in that: The second channel is provided with a second protrusion at the end of the channel close to the first channel, with the protrusion direction facing the liquid outlet. The second protrusion presses against the second part of the elastic diaphragm, and the second part is formed by a combination of multiple sub-parts, and the multiple sub-parts are arranged in a ring.

6. The liquid check valve according to claim 1, characterized in that: The first protrusion is a cone, and a plurality of the first protrusions are arranged in a ring shape and abut against the first portion of the elastic diaphragm.

7. The liquid check valve according to claim 6, characterized in that: The end of the second channel close to the first channel is arranged in a ring and presses against the second part of the elastic diaphragm, and the ring center point of the first part and the ring center point of the second part are located at the same point.

8. The liquid check valve according to claim 1, characterized in that: The junction of the liquid inlet portion and the liquid outlet portion is sealed and connected.

9. An infusion device, characterized in that: It comprises a liquid inlet pipe, a liquid outlet pipe and a liquid check valve as described in any one of claims 1 to 8, one end of the liquid inlet pipe is connected to the liquid inlet part of the liquid check valve and forms a liquid medicine circulation passage, and one end of the liquid outlet pipe is connected to the liquid outlet part of the liquid check valve and forms a liquid medicine circulation passage.

10. The infusion device according to claim 9, characterized in that: The liquid inlet pipe and the liquid inlet portion of the liquid check valve are integrally formed, and the liquid outlet pipe and the liquid outlet portion of the liquid check valve are integrally formed.

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