Three-way valve device and pumping infusion system

Abstract

The utility model provides a three-way valve device and a pumping infusion system. The three-way valve device comprises a valve sleeve and a valve element, the valve sleeve is provided with a through hole, the valve element is arranged in the through hole, the two ends of the valve element are connected with the inner wall of the valve sleeve in a sealed mode, a valve sleeve outlet and two valve sleeve inlets are formed in the side wall of the valve sleeve, the valve sleeve inlets and the valve sleeve outlet are arranged at intervals in the axial direction, and a plurality of valve element outlets and valve element inlets are formed in the valve element. And the valve core inlet and the valve core outlet are arranged at an interval in the axial direction. The valve sleeve outlet is selectively communicated with one valve element outlet, one valve sleeve inlet is communicated with the corresponding valve element inlet, the valve element is located at the first position, the valve sleeve outlet is communicated with one valve element outlet, and meanwhile one valve sleeve inlet is communicated with the corresponding valve element inlet, so that conveying of liquid needing to be conveyed is achieved; the valve sleeve outlet is communicated with the other valve element outlet, and meanwhile the other valve sleeve inlet is communicated with the corresponding valve element inlet, so that conveying of another liquid needing to be conveyed is achieved, and conveying of various kinds of liquid needing to be conveyed is achieved.

Description

Technical Field

[0001] This utility model relates to the field of pumping and infusion technology, and in particular to a three-way valve device and a pumping and infusion system. Background Technology

[0002] Currently, single-drug bag infusion is more common in pump-assisted infusion. Medical staff pre-mix the medication and then inject it into the drug box that works with the infusion pump. In particular, most chemotherapy patients need to flush the tubing with saline after the chemotherapy drugs are infused. This can improve the clinical efficacy of chemotherapy, prevent extravasation of chemotherapy drugs from damaging surrounding tissues, and reduce the risk of other complications.

[0003] However, to achieve a three-way valve for dual-drug bags, it is necessary to allow the infusion pump to automatically rotate and switch the drug bags, maintain a small volume, and ensure that the three-way valve itself has sufficient sealing to prevent leakage and cross-contamination. This has become a major obstacle limiting the widespread use of three-way valves in dual-drug bag infusions.

[0004] It should be noted that the information disclosed in the background section of this utility model is intended only to enhance the understanding of the general background of this utility model, and should not be regarded as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a three-way valve device and pump infusion system that can achieve double-bag infusion with small size and good sealing performance.

[0006] To achieve the above objectives, this utility model provides a three-way valve device, including a valve sleeve and a valve core. The valve sleeve has a through hole; the valve core is disposed within the through hole, and both ends of the valve core are sealed to the inner wall of the valve sleeve; the side wall of the valve sleeve has a valve sleeve outlet and two valve sleeve inlets, which are axially spaced apart; the valve core has multiple valve core outlets and two valve core inlets corresponding to the valve sleeve inlets, which are axially spaced apart from the valve core outlets; the valve sleeve outlets selectively communicate with one of the valve core outlets, and one of the valve sleeve inlets communicates with a corresponding valve core inlet.

[0007] Optionally, the valve core has a specific region, the outer diameter of which is smaller than the inner diameter of the valve sleeve.

[0008] Optionally, the number of valve core outlets is two; the central axes of the two valve sleeve outlets are located on the same plane in the axial direction and are spaced apart in the radial direction; the two valve core outlets are spaced apart in the radial direction, and the valve core inlet corresponds to the valve core outlet one by one.

[0009] Optionally, the central axes of the two valve sleeve inlets are located on the same straight line.

[0010] Optionally, the valve core includes a first part, a second part, and a third part connected sequentially in the axial direction, wherein the outer diameter of the first part is larger than the outer diameters of the second part and the third part; the valve core outlet and the valve core inlet are located in the first part and the third part, respectively; the second part is a specific area, and the outer diameter of the second part is smaller than the inner diameter of the valve sleeve.

[0011] Optionally, the number of valve core outlets is three; the three valve core outlets are arranged radially spaced apart, and the two valve core inlets are arranged axially and radially spaced apart, with each of the two valve core inlets corresponding to one of the two valve core outlets.

[0012] Optionally, the end of the valve core near the valve core outlet has a specific area, the outer diameter of which is smaller than the inner diameter of the valve sleeve.

[0013] Optionally, the end of the valve core near the valve core outlet has the largest outer diameter, and a first groove is formed on the end.

[0014] Optionally, a boss is provided between the end and the valve core outlet, and a second groove corresponding to the boss is provided on the inner wall of the valve sleeve, with the boss and the second groove being interference-fitted; and / or, an indicator groove is provided on the side wall of the end; and / or, a limiting member is provided on the side of the end near the valve core outlet, and a limiting groove is provided on the inner wall of the valve sleeve, with the limiting member movable along the limiting groove.

[0015] To achieve the above objectives, this utility model also provides a pumping and infusion system, including the aforementioned three-way valve device.

[0016] Compared with the prior art, the three-way valve device and pump delivery system provided by this utility model have the following advantages:

[0017] The three-way valve device includes a valve sleeve and a valve core. The valve sleeve has a through hole, and the valve core is located in the through hole. Both ends of the valve core are sealed to the inner wall of the valve sleeve. The side wall of the valve sleeve has a valve sleeve outlet and two valve sleeve inlets, which are spaced apart axially. The valve core has multiple valve core outlets and two valve core inlets corresponding to the valve sleeve inlets, which are spaced apart axially. The valve sleeve outlet is selectively connected to a valve core outlet, and a valve sleeve inlet is connected to a corresponding valve core inlet. That is, when the valve core is in the first position, the valve sleeve outlet is connected to one of the multiple valve core outlets, and at the same time, one of the two valve sleeve outlets is connected to its corresponding valve core inlet. The two ends of the valve core are sealed to the inner wall of the valve sleeve, thereby realizing the transportation of the liquid to be transported. When another liquid to be transported needs to be transported, the valve core can be rotated, and the valve core is in the second position. The valve sleeve outlet is connected to another valve core outlet, and at the same time, another valve sleeve inlet is connected to its corresponding valve core inlet, thereby realizing the transportation of another liquid to be transported. That is, through this three-way valve device, multiple liquids to be transported can be transported. Moreover, the device has a high degree of structural integration, small size, and good sealing performance. Attached Figure Description

[0018] Figure 1 A schematic diagram of the structure of a three-way valve device provided in one embodiment of this utility model;

[0019] Figure 2 for Figure 1 A schematic diagram of the valve sleeve shown;

[0020] Figure 3 for Figure 1 The diagram shows the structure of the valve core.

[0021] Figure 4 for Figure 1 The front view of the valve core shown;

[0022] Figure 5 A schematic diagram of the structure of a three-way valve device provided in another embodiment;

[0023] Figure 6 for Figure 5 The diagram shows the structure of the valve core. Detailed Implementation

[0024] The following detailed description of the three-way valve device and pumping infusion system proposed in this utility model, in conjunction with the accompanying drawings and specific embodiments, will provide further details. The advantages and features of this utility model will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, intended only to facilitate and clarify the explanation of the embodiments of this utility model. Please refer to the drawings to make the objectives, features, and advantages of this utility model more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only for illustrative purposes and to enable those skilled in the art to understand and read them, and are not intended to limit the implementation conditions of this utility model. Any modifications to the structure, changes in proportions, or adjustments to the size, provided they produce the same or similar effects and achieve the same objectives as this utility model, should still fall within the scope of the technical content disclosed in this utility model. Specific design features of this utility model disclosed herein, including, for example, specific dimensions, orientations, positions, and shapes, will be determined in part by the specific application and usage environment. Furthermore, in the embodiments described below, the same reference numerals are sometimes used across different figures to denote the same parts or parts having the same function, and their repeated descriptions are omitted. In this specification, similar reference numerals and letters are used to denote similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor should they be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The singular forms “a,” “one,” and “the” include plural objects. The term “or” is generally used to mean “and / or.” The term “several” is generally used to mean “at least one.” The term “at least two” is generally used to mean “two or more.” The term “multiple” is generally used to mean “at least two.”

[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction relationship between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Moreover, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] The core idea of ​​this utility model is to provide a three-way valve device, including a valve sleeve and a valve core. This three-way valve device is used in a pump infusion system to achieve dual-bag delivery. Specifically, the valve sleeve of the three-way valve device has a through hole, and the valve core is disposed within the through hole, with both ends of the valve core sealed to the inner wall of the valve sleeve. The side wall of the valve sleeve has a valve sleeve outlet and two valve sleeve inlets, which are axially spaced apart. The valve core has multiple valve core outlets and two valve core inlets corresponding to the valve sleeve inlets, which are axially spaced apart from the valve core outlets. The valve sleeve outlets selectively communicate with one valve core outlet, and one valve sleeve inlet communicates with a corresponding valve core inlet.

[0028] In other words, when the valve core is in the first position, the valve sleeve outlet is connected to one of the multiple valve core outlets, and simultaneously, one of the two valve sleeve inlets is connected to its corresponding valve core inlet. Furthermore, both ends of the valve core are sealed to the inner wall of the valve sleeve, thus enabling the delivery of the liquid to be transported. When another liquid needs to be transported, the valve core can be rotated, causing the valve sleeve outlet to connect to another of the multiple valve core outlets, and simultaneously, the other valve sleeve inlet to connect to its corresponding valve core inlet, thereby enabling the transport of the other liquid. Thus, this three-way valve device can transport two different liquids, and the device has a high degree of structural integration, small size, and good sealing performance. It should be noted that the liquid being transported in this application can be a drug, which flows from a drug bag and is infused via a pump. Furthermore, in one embodiment, the valve core has a specific region whose outer diameter is smaller than the inner diameter of the valve sleeve. That is, the valve core is not a constant diameter structure, but has a portion of smaller diameters, and the outer diameter of this portion is smaller than the inner diameter of the valve sleeve. This allows the portion to be clearance-fitted with the valve sleeve, thereby enabling the infusion pump to switch delivery with less torque by rotating the valve core, resulting in less power loss.

[0029] Please refer to the reference. Figures 1-4 One embodiment of the three-way valve device 100 includes a valve sleeve 110 and a valve core 120. The valve sleeve 110 has a through hole 111, and the valve core 120 is disposed within the through hole 111. Both ends of the valve core 120 are sealed to the inner wall of the valve sleeve 110, thereby ensuring the sealing performance of the entire three-way valve device 100. The two ends of the valve core 120 can be sealed to the inner wall of the valve sleeve 110 by means of interference fit or other methods. A valve sleeve outlet 112 and two valve sleeve inlets (113a, 113b) are provided on the side wall of the valve sleeve 110, and the valve sleeve outlet 112 and valve sleeve inlets are spaced apart axially. In this embodiment, the central axes of the two valve sleeve inlets 113a and 113b are located on the same plane axially and are spaced apart radially, that is, the central axes of the valve sleeve inlets 113a and 113b are at the same height and spaced apart at a certain angle in the diametrical direction. The central axes of valve sleeve inlet 113a and valve sleeve inlet 113b are spaced 180 degrees apart in the diametrical direction, meaning their central axes are radially aligned. This arrangement allows for more precise rotation of the valve core 120. Furthermore, in this embodiment, the valve sleeve 110 can be cylindrical, with the valve sleeve outlet 112 and two valve sleeve inlets (113a, 113b) located on the side wall of the valve sleeve 110. The valve sleeve outlet is positioned above valve sleeve inlets 113a and 113b. The valve sleeve outlet 112, valve sleeve inlet 113a, and valve sleeve inlet 113b can all be formed by extending outwards from the side wall of the valve sleeve 110.

[0030] Correspondingly, in this embodiment, there are two valve core outlets, 121a and 121b, which are radially spaced apart. That is, the central axes of the two valve core outlets 121a and 121b are at the same height axially and are arranged at a certain angle radially. The valve core inlet corresponds to the valve sleeve inlet, so there are also two valve core inlets, 122a and 122b, which correspond one-to-one with the two valve core outlets 121a and 121b. That is, valve core outlet 121a and valve core inlet 122a correspond to each other and are located on the same generatrix axially, while valve core outlet 121b and valve core inlet 122b correspond to each other and are radially spaced apart. Using this structure, as... Figure 1 As shown, when the valve core 120 is in the first position, the valve core inlet 121a and the valve core outlet 122a are connected, corresponding to the valve sleeve inlet 113a and the valve sleeve outlet 112 respectively. That is, the valve core inlet 121a and the valve sleeve inlet 113a are connected, and the valve core outlet 122a and the valve sleeve outlet 112 are connected, thus enabling the infusion of medicine from medicine bag A. Rotating the valve core 120 closes the valve core inlet 121a and the valve core outlet 122a for infusing medicine bag A through an interference fit with the inner wall of the valve sleeve 110, connecting the valve core inlet 121b and the valve core outlet 122b. The valve core inlet 121b and the valve core outlet 122b are also connected to the valve sleeve inlet 113b and the valve sleeve outlet 112 respectively. At this time, medicine bag B is opened, and medicine from medicine bag B is infused. Therefore, this three-way valve device 100 can convey two types of liquids, and the device has a high degree of structural integration, small size, and good sealing performance.

[0031] It should be noted that the valve core 120 has a first groove 123, which is used to pass through the three-way valve motor shaft of the infusion pump. This allows the valve core 120 to rotate clockwise or counterclockwise via the three-way valve motor shaft. When switching medication bags is required, the rotation of the three-way valve motor shaft is controlled to achieve automatic control of the infusion pump and switching of medication bags for infusion.

[0032] Further, in one embodiment, the end 124 of the valve core 120 near the valve core outlet has the largest outer diameter, that is, the diameter of the upper end of the valve core 120 is larger than the diameter of other parts of the valve core 120, and the upper end of the valve core 120 has the largest outer diameter. Also, the first groove is formed at the end 124, and the end 124 has the largest diameter, thereby providing support for the three-way valve motor shaft. Further, in one embodiment, a limiting member 125 is provided on the side of the end 124 near the valve core outlet, that is, a limiting member 125 is provided on the lower surface of the end 124, and this limiting member 125 can be a protruding structure. Correspondingly, the inner wall of the valve sleeve 110 is provided with a limiting groove 114, and the limiting member 125 can move along the limiting groove 114. Specifically, the limiting groove 114 is formed on the upper surface of the valve sleeve 110. Therefore, when the valve core 120 is installed in the valve sleeve 110, the limiting member 125 can be aligned with the limiting groove 114, and the valve core 120 can be pressed vertically into the valve sleeve 110 to complete the installation of the three-way valve device. The limiting groove 114 of the valve sleeve 110 is used to limit the limiting member 125 of the valve core. The limiting member 125 can only rotate freely in the limiting groove 114, which further improves the accuracy of the valve core 120 when rotating.

[0033] Please refer to the references. Figure 2 and Figure 3 In one embodiment, the valve core 120 includes a first part 126, a second part 127, and a third part 128 connected sequentially in the axial direction. That is, the valve core 120 has an unequal diameter structure, with its structure, excluding the end 124, comprising three regions of different diameters, corresponding to the first part 126, the second part 127, and the third part 128, respectively. The valve core 120 can be integrally molded, further ensuring sealing performance. Specifically, the outer diameter of the first part 126 is larger than the outer diameters of the second part 127 and the third part 128, while the outer diameters of the second part 127 and the third part 128 are the same. In other words, the valve core 120 has a segmented equal-diameter structure. In this embodiment, the valve core outlet and valve core inlet are located in the first part 126 and the third part 128, respectively, and the second part 127 is a specific area. The outer diameter of the second part 127 is smaller than the inner diameter of the valve sleeve 110. That is, after the valve core 120 is assembled into the valve sleeve 110, the second part 127 is in clearance fit with the corresponding area of ​​the valve sleeve 110, thereby enabling the infusion pump to switch delivery by rotating the valve core with less torque and less power loss.

[0034] In one embodiment, a boss 129 is provided between the end portion 124 and the valve core outlet, and a second groove 115 corresponding to the boss 129 is provided on the inner wall of the valve sleeve 110. The boss 129 and the second groove 115 are interference-fitted to prevent the valve core 120 from being dislodged from the valve sleeve 110 due to force, thereby preventing leakage of the three-way valve device. Specifically, the boss 129 is located between the end portion 124 and the first part 126.

[0035] Specifically, in this embodiment, as described above, the valve core 120 has four parts, i.e., four regions, and the corresponding valve sleeve 110 also has four regions: the anti-detachment region 110a, the upper region 110b, the middle region 110c, and the lower region 110d. That is, when the valve core 120 is installed in the valve sleeve 110, the region where the boss 129 is located corresponds to the anti-detachment region 110a, and the upper region 110b, the middle region 110c, and the lower region 110d correspond to the first part 126, the second part 127, and the third part 128, respectively. The boss 129 and the anti-detachment region 110a are interference-fitted, causing the anti-detachment region 110a to press the region where the boss 129 is located downwards, preventing the valve core 120 from being dislodged from the valve sleeve 110 due to force, thus preventing leakage from the three-way valve device. In addition, the upper region 110b of the valve sleeve 110 is used for interference fit with the first part 126 of the upper region of the valve core, that is, the inner diameter of the first part 126 is tightly fitted with the outer diameter of the upper region 110b of the valve core to prevent liquid from flowing or leaking inside the valve sleeve and outside the valve core.

[0036] The middle section 110c of the valve sleeve is clearance-fitted with the second part 127 of the valve core, and the inner diameter of the middle section 110c is smaller than the inner diameter of the upper section 110b. This clearance fit reduces the interference area, thereby reducing the rotational torque when the valve core 120 and valve sleeve 110 are engaged, and consequently reducing the power loss of the infusion pump. The lower section 110d of the valve sleeve is interference-fitted with the third part 128 of the valve core, meaning the inner diameter of the lower section 110d is interference-fitted with the outer diameter of the third part 128 of the valve core, preventing cross-contamination or leakage of the medication inside the valve sleeve and outside the valve core. It should be noted that the outer diameters of the second part 127 and the third part 128 of the valve core are the same, and the outer diameter of the middle section 110c of the valve sleeve is smaller than the outer diameter of the lower section 110d. Therefore, it can be seen that the outlets of both the valve sleeve and the valve core are located in their corresponding upper regions, while the inlets are located in their corresponding lower regions. The outlets and inlets serve as channels for the liquid in the pipeline. Furthermore, in both the upper and lower regions, the valve core and valve sleeve are circumferentially interference-fitted to maintain a seal. When the middle region of the valve sleeve mates with the valve core, there are no inlet or outlet channels. The middle region 110c and the second part 127 are configured as clearance fits. Since both the outlets and inlets in the upper and lower regions are sealed, the liquid only passes through and is stored within the inner diameter of the valve core 120. The clearance fit also reduces the area of ​​the interference region, allowing the infusion pump to switch the medicine bag with less torque, reducing power loss. It also reduces the rotational shear stress on the valve core, thus extending the lifespan of the three-way valve device.

[0037] The aforementioned three-way valve device 100 ensures sufficient sealing of the interference area by using an interference fit on the circumferential sections of the inlet and outlet along their axial directions. Additionally, a clearance fit is used on the middle layer, allowing the valve core 120 to rotate freely. This reduces torque by minimizing unnecessary interference and eliminates the need for draft during demolding, ensuring that the upper and lower layers are not affected by the draft angle and thus providing better sealing. Furthermore, the interference fit design of the anti-detachment zone 110a of the valve sleeve 110 and the boss 129 of the valve core 129 provides a secondary seal to prevent leakage from the internal three-way valve. Additionally, a "safety lock" design is added to prevent the valve core from detaching under abnormal conditions such as accidental drops, impacts, or vibrations.

[0038] Please refer to the reference. Figure 5 and Figure 6 Another embodiment of the three-way valve device 200 includes a valve sleeve 210 and a valve core 220. The valve sleeve 210 has a through hole, and the valve core 220 is disposed within the through hole. Both ends of the valve core 220 are sealed to the inner wall of the valve sleeve 210, thereby ensuring the sealing performance of the entire three-way valve device 200. The two ends of the valve core 220 can be sealed to the inner wall of the valve sleeve 210 by means of interference fit or other methods. A valve sleeve outlet 212 and two valve sleeve inlets (213a, 213b) are provided on the side wall of the valve sleeve 110, and the valve sleeve outlet 212 and valve sleeve inlets are spaced apart axially. In this embodiment, the central axes of the two valve sleeve inlets 213a and 213b are parallel and spaced apart axially, and the two valve sleeve inlets 213a and 213b are located on the same generatrix axially. Furthermore, in this embodiment, the valve sleeve 210 can be cylindrical. The valve sleeve outlet 212 and two valve sleeve inlets (213a, 213b) are located on the side wall of the valve sleeve 110. The valve sleeve outlet is located above the valve sleeve inlets 213a and 213b, and the valve sleeve inlet 213a is located above the valve sleeve inlet 213b. The valve sleeve outlet 212, valve sleeve inlet 213a, and valve sleeve inlet 213b can all be formed by extending outward from the side wall of the valve sleeve 210. That is, in this embodiment, one outlet of the valve sleeve 210 is in the upper row, and the two inlets are located in the middle and lower rows, respectively.

[0039] In this embodiment, there are three valve core outlets, which are radially spaced apart. That is, the central axes of the three valve core outlets are at the same height axially and are arranged at a certain angle radially. The three valve core outlets can be arranged radially at intervals of 0 degrees, 90 degrees, and 180 degrees. The valve core inlet corresponds to the valve sleeve inlet, so there are also two valve core inlets. The two valve core inlets 222a and 222b correspond one-to-one with the two valve core outlets. That is, valve core inlet 222a corresponds to one of the valve core outlets, and both are located on the same generatrix axially. Similarly, valve core inlet 222b corresponds to the other valve core outlet. With this structure, when the valve core 220 is in the first position, the valve sleeve inlet 213a is connected to the valve core inlet 222a, and the valve sleeve outlet 212 is connected to the valve core outlet 221, thus realizing the infusion of medicine bag A. When infusion of medicine bag B is required, the valve core 220 is rotated. In this embodiment, it is rotated 90 degrees, placing the valve core 220 in the second position. The valve sleeve inlet 213b and the valve core inlet 222b are connected, enabling infusion of medicine bag B. In this embodiment, sterilization can also be performed. In this case, the valve core 220 can be rotated another 90 degrees, i.e., 180 degrees relative to the first position. The valve core 220 is then in the third position, with the valve sleeve inlet 213a and valve sleeve inlet 213b connected to the valve core inlet 222a and valve core inlet 222b respectively, and the valve sleeve outlet 212 connected to the valve core outlet 221. This state directly facilitates sterilization. Thus, the three-way valve device 200 can achieve the delivery of two types of liquids, and the device has a high degree of structural integration, small size, and good sealing performance.

[0040] It should be noted that the valve core 220 has a first groove 223, which is used to pass through the three-way valve motor shaft of the infusion pump. This allows the valve core 220 to rotate clockwise or counterclockwise via the three-way valve motor shaft. When switching medication bags is required, the rotation of the three-way valve motor shaft is controlled to achieve automatic control of the infusion pump and switching of medication bags for infusion.

[0041] Further, in one embodiment, the end 224 of the valve core 220 near the valve core outlet has the largest outer diameter, that is, the diameter of the upper end of the valve core 220 is larger than the diameter of other parts of the valve core 220, and the upper end of the valve core 220 has the largest outer diameter. Also, the first groove is formed at the end 224, and the end 224 has the largest diameter, thereby providing support for the three-way valve motor shaft. Further, in one embodiment, a limiting member is provided on the side of the end 224 near the valve core outlet, that is, a limiting member is provided on the lower surface of the end 224, and this limiting member can be a protruding structure. Correspondingly, the inner wall of the valve sleeve 210 is provided with a limiting groove, and the limiting member can move along the limiting groove. Specifically, the limiting groove is formed on the upper surface of the valve sleeve 210. Therefore, when the valve core 20 is installed in the valve sleeve 210, the limiting member can be aligned with the limiting groove, and the valve core 220 can be pressed vertically into the valve sleeve 210 to complete the installation of the three-way valve device 200. The limiting groove of the valve sleeve 210 is used to limit the limiting member of the valve core. The limiting member can only rotate freely in the limiting groove, which further improves the accuracy of the valve core 220 when rotating.

[0042] Please refer to this again. Figure 6 In one embodiment, the valve core 220 includes an end portion 224, a specific region 225, and a body portion 226. In this embodiment, both the valve core outlet and the valve core inlet are located in the body portion 226. The outer diameter of the specific region 225 is smaller than the inner diameter of the valve sleeve 110. That is, after the valve core 220 is assembled into the valve sleeve 210, the specific region 225 has a clearance fit with the corresponding area of ​​the valve sleeve 210, thereby allowing the infusion pump to switch delivery with a smaller torque when rotating the valve core, resulting in less power loss. The outer diameter of the end portion 224 is larger than the outer diameter of the body portion 226, and the outer diameter of the body portion 226 is larger than the maximum outer diameter of the specific region 225.

[0043] In one embodiment, a boss 229 is provided between the end 224 and the valve core outlet, and a second groove corresponding to the boss 229 is provided on the inner wall of the valve sleeve 210. The boss 229 and the second groove are interference-fitted to prevent the valve core 220 from being dislodged from the valve sleeve 210 due to force, thereby preventing leakage of the three-way valve device. Specifically, the boss 229 is located in a specific area 225.

[0044] Specifically, in this embodiment, as described above, the valve core 220 has three parts, i.e., three regions, and the corresponding valve sleeve 210 also has three regions: an upper region, a middle region, and a lower region. That is, when the valve core 220 is installed in the valve sleeve 210, the region where the boss 229 is located corresponds to the middle region, the body corresponds to the lower region, and the end corresponds to the upper region. The boss 229 is press-fitted with the middle region, causing the middle region to press the region where the boss 229 is located downwards, preventing the valve core 220 from being dislodged from the valve sleeve 210 due to force, thus preventing leakage from the three-way valve device. Furthermore, the lower region of the valve sleeve 210 is press-fitted with the body of the valve core 210, meaning the inner diameter of the lower region is tightly fitted with the outer diameter of the valve core body, preventing liquid from mixing or leaking between the valve sleeve and the valve core.

[0045] The clearance fit between the specific area 225 and the inner wall of the valve sleeve 210 reduces the interference area, thereby reducing the rotational torque when the valve core 220 and valve sleeve 210 are engaged. This reduces the power loss of the infusion pump and also reduces the rotational shear stress of the valve core, extending the life of the three-way valve device. The boss design ensures the sealing of the upper part of the valve sleeve and valve core. To further improve sealing, such as... Figure 5 As shown, a seal is provided at the valve core sealing groove 227 to further prevent leakage of the medicine.

[0046] It should be noted that the valve core 220 in this embodiment basically adopts a frustum-shaped design, and the valve sleeve 210 that cooperates with it also adopts this design, thereby solving the problem of derived axial force caused by the conical surface cooperation between the valve sleeve and the valve core. By setting a specific area between the end and the body, the problem of the valve core and valve sleeve coming off due to temperature or other factors, resulting in liquid leakage, can be solved.

[0047] This application also provides a pumping infusion system, including a three-way valve device and a valve rotating shaft as described in any of the above embodiments. The connection relationships and structural features between the structures of this application are as described in any of the above embodiments, and will not be repeated here.

[0048] It should be noted that in the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0049] It should also be noted that the above description is only a description of the preferred embodiment of this utility model and is not intended to limit the scope of this utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure are within the protection scope of this utility model. Obviously, those skilled in the art can make various modifications and variations to the utility model without departing from the spirit and scope of this utility model. Therefore, if these modifications and variations fall within the scope of this utility model and its equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A three-way valve device, characterized in that, The device includes a valve sleeve and a valve core. The valve sleeve has a through hole. The valve core is disposed within the through hole, and both ends of the valve core are sealed to the inner wall of the valve sleeve. The side wall of the valve sleeve has a valve sleeve outlet and two valve sleeve inlets, which are axially spaced apart. The valve core has multiple valve core outlets and two valve core inlets corresponding to the valve sleeve inlets, which are axially spaced apart from the valve core outlets. The valve sleeve outlets are selectively connected to one of the valve core outlets, and one of the valve sleeve inlets is connected to a corresponding valve core inlet.

2. The three-way valve device according to claim 1, characterized in that, The valve core has a specific area, the outer diameter of which is smaller than the inner diameter of the valve sleeve.

3. The three-way valve device according to claim 1 or 2, characterized in that, The valve core outlet has two outlets; the central axes of the two valve sleeve outlets are located on the same plane in the axial direction and are spaced apart in the radial direction; the two valve core outlets are spaced apart in the radial direction, and the valve core inlet corresponds to the valve core outlet one by one.

4. The three-way valve device according to claim 3, characterized in that, The central axes of the two valve sleeve inlets are located on the same straight line.

5. The three-way valve device according to claim 3, characterized in that, The valve core includes a first part, a second part, and a third part connected sequentially in the axial direction. The outer diameter of the first part is larger than the outer diameters of the second part and the third part. The valve core outlet and the valve core inlet are located in the first part and the third part, respectively. The second part is a specific area, and the outer diameter of the second part is smaller than the inner diameter of the valve sleeve.

6. The three-way valve device according to claim 1 or 2, characterized in that, The valve core outlet has three outlets; the three outlets are radially spaced apart, and the two inlets are axially and radially spaced apart, with each inlet corresponding to one of the two outlets.

7. The three-way valve device according to claim 6, characterized in that, The valve core has a specific area at the end near the valve core outlet, and the outer diameter of the specific area is smaller than the inner diameter of the valve sleeve.

8. The three-way valve device according to claim 1 or 2, characterized in that, The end of the valve core near the valve core outlet has the largest outer diameter, and a first groove is formed on the end.

9. The three-way valve device according to claim 8, characterized in that, A boss is provided between the end and the valve core outlet, and a second groove corresponding to the boss is provided on the inner wall of the valve sleeve; the boss and the second groove are interference-fitted; and / or, An indicator groove is provided on the side wall of the end; and / or, A limiting member is provided on the side of the end near the valve core outlet, and a limiting groove is provided on the inner wall of the valve sleeve, and the limiting member can move along the limiting groove.

10. A pumping and infusion system, characterized in that, Includes a three-way valve device as described in any one of claims 1-9.

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