A backflow valve with adjustable backstop direction

Abstract

The present application relates to a kind of adjustable check direction's backflow valve, for pipeline, including fixedly arranged in pipeline intermediate layer board, setting above intermediate layer board upper adjusting device and setting below intermediate layer board lower adjusting device.In use, suppose needle of needle tube is located in the lower end position of pipeline, rotates lower adjusting handle, and lower layer rubber valve has certain gap with the elliptical through hole of intermediate layer. Pull needle tube, liquid passes through the remaining four upper layer plate through holes of upper layer plate, four elliptical through holes of intermediate layer and lower layer plate through hole in turn, so that a certain amount of liquid is extracted in needle tube, due to the characteristics of lower layer rubber valve, if backflow occurs, the four elliptical through holes of intermediate layer that can flow will be blocked by lower layer rubber valve.

Description

Technical Field

[0001] This invention relates to a backflow valve with adjustable non-reverse direction. Background Technology

[0002] When taking liquid samples from a tubing for testing or observation, a syringe is usually used to extract the liquid. However, air in the syringe can contaminate the sample and affect the test results.

[0003] Existing document CN202110327984.4 discloses a method for detecting the status of a backflow valve, comprising the following steps: hardware topology connection, adding an electromagnetic reset device to the backflow valve of a fan, and connecting a BMC to the electromagnetic reset device, the fan, and the backflow valve respectively; the BMC detects the fan speed signal and controls the electromagnetic reset device; when the server supplies power to the fan and the BMC detects the speed signal, the backflow valve status is detected, and a first fault is determined based on the detection result, and the first fault is reported to the server based on the determination result; when the power supply to the server is interrupted, the backflow valve status is detected, and a second fault is determined based on the detection result, and the second fault is reported to the server based on the determination result; this invention detects the status of the backflow valve, thereby determining whether a fault has occurred, further determining the cause of the fault, and performing maintenance actions as early as possible to ensure normal server operation and improve server stability.

[0004] Existing document CN201810248390.2 discloses a venous blood sample collection anti-backflow valve device and a blood collection needle device, relating to the field of medical device technology. The blood collection needle device provided by this invention includes a venous blood collection needle, a tubing puncture needle, and a connecting part connecting the venous blood collection needle and the tubing puncture needle. The connecting part is equipped with a venous blood sample collection anti-backflow valve device. The anti-backflow valve device includes: a first connecting seat with a through hole in the middle, an elastic anti-backflow valve installed on the first connecting seat, and a second connecting seat that cooperates with the first connecting seat to form a cavity accommodating the elastic anti-backflow valve. The second connecting seat is engaged with the first connecting seat. The second connecting seat has a through hole communicating with the outside, effectively preventing the collected blood from flowing back into the body, avoiding contaminated blood from entering the body and causing harm. Furthermore, it eliminates the need for aseptic treatment of the entire blood collection container, saving costs.

[0005] The above two methods cannot remove the gas in the syringe, and cannot solve the problem of gas bubbles in the syringe affecting the experimental results. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a backflow valve with adjustable check direction that can remove gas from a syringe.

[0007] The present invention adopts the following technical solution:

[0008] The present invention is used in pipelines and includes an intermediate layer plate fixedly installed on the pipeline, an upper adjustment device installed above the intermediate layer plate, and a lower adjustment device installed below the intermediate layer plate.

[0009] The intermediate layer plate of the present invention is provided with eight elliptical through holes distributed around the center of the intermediate layer plate.

[0010] The intermediate layer plate of the present invention has a guide post through the middle position, the elliptical through holes are distributed between the guide post and the edge of the intermediate layer plate, and the upper adjustment device and the lower adjustment device are both arranged on the guide post.

[0011] The upper adjustment device of the present invention includes an upper guide barrel with an opening facing downward, an upper plate fixedly disposed at the lower end of the upper guide barrel and located on the outer wall of the upper guide barrel, eight upper plate through holes disposed on the upper plate, four upper rubber flaps disposed between the upper plate and the middle plate and fixedly connected to the upper plate, and an upper position adjustment device disposed on one side of the upper guide barrel. The upper plate through holes are disposed between the edges of the upper guide barrel and the upper plate and divide the upper plate evenly. The upper plate through holes are arranged opposite to the elliptical through holes, and the upper rubber flaps are staggered at the positions of the upper plate through holes.

[0012] The upper position adjustment device of the present invention includes a first adjustment tooth disposed on the side wall of the upper guide barrel, an upper adjustment shaft disposed on one side of the upper guide barrel, and a second adjustment tooth disposed on the upper adjustment shaft and meshing with the first adjustment tooth. The first adjustment tooth is vertically distributed on the side wall of the upper guide barrel, and the second adjustment tooth is disposed on the outer surface of the upper adjustment shaft. One end of the upper adjustment shaft is rotatably connected to the inner side wall of the pipeline, and the other end passes through the side wall of the pipeline to the outer side of the pipeline.

[0013] The upper adjusting shaft and the pipeline of the present invention are provided with an upper sealing ring, and the upper adjusting shaft and the upper sealing ring are interference fit.

[0014] The upper adjustment shaft of the present invention is provided with an upper adjustment handle at one end located outside the pipeline.

[0015] The lower adjustment device of the present invention includes an upward-opening lower guide barrel, a lower plate fixedly disposed at the upper end of the lower guide barrel and located on the outer side wall of the lower guide barrel, eight lower plate through holes disposed on the lower plate, four lower rubber valves disposed between the lower plate and the middle plate and fixedly connected to the lower plate, and a lower position adjustment device disposed on one side of the lower guide barrel. The lower plate through holes are disposed between the lower guide barrel and the edge of the lower plate and divide the lower plate evenly. The lower plate through holes are arranged opposite to the elliptical through holes. The lower rubber valves are staggered at the positions of the lower plate through holes. The lower rubber valves and the upper rubber valves are staggered.

[0016] The lower position adjustment device of the present invention includes a third adjustment tooth disposed on the side wall of the lower guide barrel, a lower adjustment shaft disposed on one side of the lower guide barrel, and a fourth adjustment tooth disposed on the lower adjustment shaft and meshing with the third adjustment tooth. The third adjustment tooth is vertically distributed under the side wall of the lower guide barrel, and the fourth adjustment tooth is disposed under the outer surface of the lower adjustment shaft. One end of the lower adjustment shaft is rotatably connected to the inner side wall of the pipeline, and the other end passes through the side wall of the pipeline to the outer side of the pipeline.

[0017] The lower adjusting shaft of the present invention is provided with a lower sealing ring at the penetration point of the pipeline, the lower adjusting shaft and the lower sealing ring are interference fit, and a lower adjusting handle is provided at the end of the lower adjusting shaft located outside the pipeline.

[0018] The positive effects of this invention are as follows:

[0019] When using the syringe, assuming the needle is at the lower end of the tubing, rotate the adjustment handle to create a gap between the lower rubber valve and the elliptical through-holes in the middle layer. Pull the syringe; the liquid will sequentially pass through the remaining four through-holes in the upper plate, the four elliptical through-holes in the middle layer, and the through-holes in the lower plate, drawing a certain amount of liquid into the syringe. Due to the characteristics of the lower rubber valve, if backflow occurs, the four elliptical through-holes in the middle layer that allow flow will be blocked by the lower rubber valve.

[0020] Rotate the lower adjustment handle to ensure the lower rubber valve is flush with the elliptical through-hole in the middle layer. Rotate the upper adjustment handle to create a gap between the upper rubber valve and the elliptical through-hole in the middle layer. Push the syringe; the liquid will pass sequentially through the remaining four through-holes in the lower plate, the four elliptical through-holes in the middle layer, and the through-holes in the upper plate. This allows the liquid in the syringe to be discharged along with the gas to the upper end of the tubing. Due to the characteristics of the upper rubber valve, if backflow occurs, the four elliptical through-holes in the middle layer that allow flow will be blocked by the lower rubber valve.

[0021] Repeat the above steps several times, and the liquid that removes the gas will be obtained in the syringe. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram showing the location of the intermediate layer plate in this invention;

[0024] Figure 3 This is a schematic diagram of the intermediate layer plate structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the distribution of the upper rubber valve in this invention;

[0026] Figure 5This is a schematic diagram showing the positions of the upper plate and the upper rubber flap of the present invention;

[0027] Figure 6 This is a schematic diagram of the distribution of the lower layer rubber valve in this invention;

[0028] Figure 7 This is a schematic diagram showing the positions of the lower plate and the lower rubber flap of the present invention;

[0029] Figure 8 This is a schematic diagram of the position adjustment device structure of the present invention;

[0030] Figure 9 This is a schematic diagram of the position adjustment device of the present invention.

[0031] In the attached diagram: 1. Pipeline; 2. Intermediate layer plate; 3. Elliptical through hole; 4. Guide post; 5. Upper guide barrel; 6. Upper layer plate; 7. Upper layer plate through hole; 8. Upper rubber valve; 9. First adjusting tooth; 10. Upper adjusting shaft; 11. Second adjusting tooth; 12. Upper sealing ring; 13. Upper adjusting handle; 14. Lower guide barrel; 15. Lower layer plate; 16. Lower layer plate through hole; 17. Lower rubber valve; 18. Third adjusting tooth; 19. Lower adjusting shaft; 20. Fourth adjusting tooth; 21. Lower sealing ring; 22. Lower adjusting handle. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0035] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0036] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0037] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0038] Example 1

[0039] As attached Figure 1 As shown in Figure 9, the present invention is used on a pipeline 1 and includes an intermediate layer plate 2 fixedly installed on the pipeline 1, an upper adjustment device installed above the intermediate layer plate 2, and a lower adjustment device installed below the intermediate layer plate 2.

[0040] The intermediate layer plate 2 is provided with eight elliptical through holes 3 distributed around the center of the intermediate layer plate 2.

[0041] A guide post 4 is provided through the middle of the intermediate layer plate 2, and the elliptical through holes 3 are distributed between the guide post 4 and the edge of the intermediate layer plate 2. The upper adjustment device and the lower adjustment device are both provided on the guide post 4.

[0042] The upper adjustment device includes an upper guide barrel 5 with its opening facing downwards, an upper plate 6 fixedly installed at the lower end of the upper guide barrel 5 and located on the outer wall of the upper guide barrel 5, eight upper plate through holes 7 installed on the upper plate 6, four upper rubber valves 8 installed between the upper plate 6 and the middle plate 2 and fixedly connected to the upper plate 6, and an upper position adjustment device installed on one side of the upper guide barrel 5. The upper plate through holes 7 are located between the edges of the upper guide barrel 5 and the upper plate 6 and divide the upper plate 6 evenly. The upper plate through holes 7 are arranged opposite to the elliptical through holes 3. The upper rubber valves 8 are staggered at the positions of the upper plate through holes 7.

[0043] The upper position adjustment device includes a first adjustment tooth 9 disposed on the side wall of the upper guide barrel 5, an upper adjustment shaft 10 disposed on one side of the upper guide barrel 5, and a second adjustment tooth 11 disposed on the upper adjustment shaft 10 and meshing with the first adjustment tooth 9. The first adjustment tooth 9 is vertically distributed on the side wall of the upper guide barrel 5, and the second adjustment tooth 11 is disposed on the outer surface of the upper adjustment shaft 10. One end of the upper adjustment shaft 10 is rotatably connected to the inner side wall of the pipe 1, and the other end passes through the side wall of the pipe 1 to the outer side of the pipe 1.

[0044] An upper sealing ring 12 is provided at the penetration point between the upper adjusting shaft 10 and the pipeline 1, and the upper adjusting shaft 10 and the upper sealing ring 12 are interference fit.

[0045] Example 2

[0046] As attached Figure 1 As shown in Figure 9, based on Example 1, the following is the same as in Example 1:

[0047] The present invention is used on a pipeline 1 and includes an intermediate layer plate 2 fixedly installed on the pipeline 1, an upper adjustment device installed above the intermediate layer plate 2, and a lower adjustment device installed below the intermediate layer plate 2.

[0048] The intermediate layer plate 2 is provided with eight elliptical through holes 3 distributed around the center of the intermediate layer plate 2.

[0049] A guide post 4 is provided through the middle of the intermediate layer plate 2, and the elliptical through holes 3 are distributed between the guide post 4 and the edge of the intermediate layer plate 2. The upper adjustment device and the lower adjustment device are both provided on the guide post 4.

[0050] The upper adjustment device includes an upper guide barrel 5 with its opening facing downwards, an upper plate 6 fixedly installed at the lower end of the upper guide barrel 5 and located on the outer wall of the upper guide barrel 5, eight upper plate through holes 7 installed on the upper plate 6, four upper rubber valves 8 installed between the upper plate 6 and the middle plate 2 and fixedly connected to the upper plate 6, and an upper position adjustment device installed on one side of the upper guide barrel 5. The upper plate through holes 7 are located between the edges of the upper guide barrel 5 and the upper plate 6 and divide the upper plate 6 evenly. The upper plate through holes 7 are arranged opposite to the elliptical through holes 3. The upper rubber valves 8 are staggered at the positions of the upper plate through holes 7.

[0051] The upper position adjustment device includes a first adjustment tooth 9 disposed on the side wall of the upper guide barrel 5, an upper adjustment shaft 10 disposed on one side of the upper guide barrel 5, and a second adjustment tooth 11 disposed on the upper adjustment shaft 10 and meshing with the first adjustment tooth 9. The first adjustment tooth 9 is vertically distributed on the side wall of the upper guide barrel 5, and the second adjustment tooth 11 is disposed on the outer surface of the upper adjustment shaft 10. One end of the upper adjustment shaft 10 is rotatably connected to the inner side wall of the pipe 1, and the other end passes through the side wall of the pipe 1 to the outer side of the pipe 1.

[0052] An upper sealing ring 12 is provided at the penetration point between the upper adjusting shaft 10 and the pipeline 1, and the upper adjusting shaft 10 and the upper sealing ring 12 are interference fit.

[0053] The difference is:

[0054] The upper adjustment shaft 10 is provided with an upper adjustment handle 13 at one end located outside the pipe 1.

[0055] Example 3

[0056] As attached Figure 1 As shown in Figure 9, based on Example 2, the following is the same as in Example 2:

[0057] The present invention is used on a pipeline 1 and includes an intermediate layer plate 2 fixedly installed on the pipeline 1, an upper adjustment device installed above the intermediate layer plate 2, and a lower adjustment device installed below the intermediate layer plate 2.

[0058] The intermediate layer plate 2 is provided with eight elliptical through holes 3 distributed around the center of the intermediate layer plate 2.

[0059] A guide post 4 is provided through the middle of the intermediate layer plate 2, and the elliptical through holes 3 are distributed between the guide post 4 and the edge of the intermediate layer plate 2. The upper adjustment device and the lower adjustment device are both provided on the guide post 4.

[0060] The upper adjustment device includes an upper guide barrel 5 with its opening facing downwards, an upper plate 6 fixedly installed at the lower end of the upper guide barrel 5 and located on the outer wall of the upper guide barrel 5, eight upper plate through holes 7 installed on the upper plate 6, four upper rubber valves 8 installed between the upper plate 6 and the middle plate 2 and fixedly connected to the upper plate 6, and an upper position adjustment device installed on one side of the upper guide barrel 5. The upper plate through holes 7 are located between the edges of the upper guide barrel 5 and the upper plate 6 and divide the upper plate 6 evenly. The upper plate through holes 7 are arranged opposite to the elliptical through holes 3. The upper rubber valves 8 are staggered at the positions of the upper plate through holes 7.

[0061] The upper position adjustment device includes a first adjustment tooth 9 disposed on the side wall of the upper guide barrel 5, an upper adjustment shaft 10 disposed on one side of the upper guide barrel 5, and a second adjustment tooth 11 disposed on the upper adjustment shaft 10 and meshing with the first adjustment tooth 9. The first adjustment tooth 9 is vertically distributed on the side wall of the upper guide barrel 5, and the second adjustment tooth 11 is disposed on the outer surface of the upper adjustment shaft 10. One end of the upper adjustment shaft 10 is rotatably connected to the inner side wall of the pipe 1, and the other end passes through the side wall of the pipe 1 to the outer side of the pipe 1.

[0062] An upper sealing ring 12 is provided at the penetration point between the upper adjusting shaft 10 and the pipeline 1, and the upper adjusting shaft 10 and the upper sealing ring 12 are interference fit.

[0063] The upper adjustment shaft 10 is provided with an upper adjustment handle 13 at one end located outside the pipe 1.

[0064] The difference is:

[0065] The lower adjustment device includes an upward-opening lower guide barrel 14, a lower plate 15 fixedly disposed on the upper end of the lower guide barrel 14 and located on the outer side wall of the lower guide barrel 14, eight lower plate through holes 16 disposed on the lower plate 15, four lower rubber valves 17 disposed between the lower plate 15 and the intermediate plate 2 and fixedly connected to the lower plate 15, and a lower position adjustment device disposed on one side of the lower guide barrel 14. The lower plate through holes 16 are disposed between the edges of the lower guide barrel 14 and the lower plate 15 and divide the lower plate 15 evenly. The lower plate through holes 16 are disposed opposite to the elliptical through holes 3. The lower rubber valves 17 are staggered at the positions of the lower plate through holes 16. The lower rubber valves 17 and the upper rubber valves 8 are staggered.

[0066] Example 4

[0067] As attached Figure 1 As shown in Figure 9, based on Example 3, the following are the same as in Example 3:

[0068] The present invention is used on a pipeline 1 and includes an intermediate layer plate 2 fixedly installed on the pipeline 1, an upper adjustment device installed above the intermediate layer plate 2, and a lower adjustment device installed below the intermediate layer plate 2.

[0069] The intermediate layer plate 2 is provided with eight elliptical through holes 3 distributed around the center of the intermediate layer plate 2.

[0070] A guide post 4 is provided through the middle of the intermediate layer plate 2, and the elliptical through holes 3 are distributed between the guide post 4 and the edge of the intermediate layer plate 2. The upper adjustment device and the lower adjustment device are both provided on the guide post 4.

[0071] The upper adjustment device includes an upper guide barrel 5 with its opening facing downwards, an upper plate 6 fixedly installed at the lower end of the upper guide barrel 5 and located on the outer wall of the upper guide barrel 5, eight upper plate through holes 7 installed on the upper plate 6, four upper rubber valves 8 installed between the upper plate 6 and the middle plate 2 and fixedly connected to the upper plate 6, and an upper position adjustment device installed on one side of the upper guide barrel 5. The upper plate through holes 7 are located between the edges of the upper guide barrel 5 and the upper plate 6 and divide the upper plate 6 evenly. The upper plate through holes 7 are arranged opposite to the elliptical through holes 3. The upper rubber valves 8 are staggered at the positions of the upper plate through holes 7.

[0072] The upper position adjustment device includes a first adjustment tooth 9 disposed on the side wall of the upper guide barrel 5, an upper adjustment shaft 10 disposed on one side of the upper guide barrel 5, and a second adjustment tooth 11 disposed on the upper adjustment shaft 10 and meshing with the first adjustment tooth 9. The first adjustment tooth 9 is vertically distributed on the side wall of the upper guide barrel 5, and the second adjustment tooth 11 is disposed on the outer surface of the upper adjustment shaft 10. One end of the upper adjustment shaft 10 is rotatably connected to the inner side wall of the pipe 1, and the other end passes through the side wall of the pipe 1 to the outer side of the pipe 1.

[0073] An upper sealing ring 12 is provided at the penetration point between the upper adjusting shaft 10 and the pipeline 1, and the upper adjusting shaft 10 and the upper sealing ring 12 are interference fit.

[0074] The upper adjustment shaft 10 is provided with an upper adjustment handle 13 at one end located outside the pipe 1.

[0075] The lower adjustment device includes an upward-opening lower guide barrel 14, a lower plate 15 fixedly disposed on the upper end of the lower guide barrel 14 and located on the outer side wall of the lower guide barrel 14, eight lower plate through holes 16 disposed on the lower plate 15, four lower rubber valves 17 disposed between the lower plate 15 and the intermediate plate 2 and fixedly connected to the lower plate 15, and a lower position adjustment device disposed on one side of the lower guide barrel 14. The lower plate through holes 16 are disposed between the edges of the lower guide barrel 14 and the lower plate 15 and divide the lower plate 15 evenly. The lower plate through holes 16 are disposed opposite to the elliptical through holes 3. The lower rubber valves 17 are staggered at the positions of the lower plate through holes 16. The lower rubber valves 17 and the upper rubber valves 8 are staggered.

[0076] The difference is:

[0077] The lower position adjustment device includes a third adjustment tooth 18 disposed on the side wall of the lower guide barrel 14, a lower adjustment shaft 19 disposed on one side of the lower guide barrel 14, and a fourth adjustment tooth 20 disposed on the lower adjustment shaft 19 and meshing with the third adjustment tooth 18. The third adjustment tooth 18 is vertically distributed under the side wall of the lower guide barrel 14, and the fourth adjustment tooth 20 is disposed under the outer surface of the lower adjustment shaft 19. One end of the lower adjustment shaft 19 is rotatably connected to the inner side wall of the pipe 1, and the other end passes through the side wall of the pipe 1 to the outer side of the pipe 1.

[0078] Example 5

[0079] As attached Figure 1 As shown in Figure 9, based on Example 4, the following is the same as in Example 4:

[0080] The present invention is used on a pipeline 1 and includes an intermediate layer plate 2 fixedly installed on the pipeline 1, an upper adjustment device installed above the intermediate layer plate 2, and a lower adjustment device installed below the intermediate layer plate 2.

[0081] The intermediate layer plate 2 is provided with eight elliptical through holes 3 distributed around the center of the intermediate layer plate 2.

[0082] A guide post 4 is provided through the middle of the intermediate layer plate 2, and the elliptical through holes 3 are distributed between the guide post 4 and the edge of the intermediate layer plate 2. The upper adjustment device and the lower adjustment device are both provided on the guide post 4.

[0083] The upper adjustment device includes an upper guide barrel 5 with its opening facing downwards, an upper plate 6 fixedly installed at the lower end of the upper guide barrel 5 and located on the outer wall of the upper guide barrel 5, eight upper plate through holes 7 installed on the upper plate 6, four upper rubber valves 8 installed between the upper plate 6 and the middle plate 2 and fixedly connected to the upper plate 6, and an upper position adjustment device installed on one side of the upper guide barrel 5. The upper plate through holes 7 are located between the edges of the upper guide barrel 5 and the upper plate 6 and divide the upper plate 6 evenly. The upper plate through holes 7 are arranged opposite to the elliptical through holes 3. The upper rubber valves 8 are staggered at the positions of the upper plate through holes 7.

[0084] The upper position adjustment device includes a first adjustment tooth 9 disposed on the side wall of the upper guide barrel 5, an upper adjustment shaft 10 disposed on one side of the upper guide barrel 5, and a second adjustment tooth 11 disposed on the upper adjustment shaft 10 and meshing with the first adjustment tooth 9. The first adjustment tooth 9 is vertically distributed on the side wall of the upper guide barrel 5, and the second adjustment tooth 11 is disposed on the outer surface of the upper adjustment shaft 10. One end of the upper adjustment shaft 10 is rotatably connected to the inner side wall of the pipe 1, and the other end passes through the side wall of the pipe 1 to the outer side of the pipe 1.

[0085] An upper sealing ring 12 is provided at the penetration point between the upper adjusting shaft 10 and the pipeline 1, and the upper adjusting shaft 10 and the upper sealing ring 12 are interference fit.

[0086] The upper adjustment shaft 10 is provided with an upper adjustment handle 13 at one end located outside the pipe 1.

[0087] The lower adjustment device includes an upward-opening lower guide barrel 14, a lower plate 15 fixedly disposed on the upper end of the lower guide barrel 14 and located on the outer side wall of the lower guide barrel 14, eight lower plate through holes 16 disposed on the lower plate 15, four lower rubber valves 17 disposed between the lower plate 15 and the intermediate plate 2 and fixedly connected to the lower plate 15, and a lower position adjustment device disposed on one side of the lower guide barrel 14. The lower plate through holes 16 are disposed between the edges of the lower guide barrel 14 and the lower plate 15 and divide the lower plate 15 evenly. The lower plate through holes 16 are disposed opposite to the elliptical through holes 3. The lower rubber valves 17 are staggered at the positions of the lower plate through holes 16. The lower rubber valves 17 and the upper rubber valves 8 are staggered.

[0088] The lower position adjustment device includes a third adjustment tooth 18 disposed on the side wall of the lower guide barrel 14, a lower adjustment shaft 19 disposed on one side of the lower guide barrel 14, and a fourth adjustment tooth 20 disposed on the lower adjustment shaft 19 and meshing with the third adjustment tooth 18. The third adjustment tooth 18 is vertically distributed under the side wall of the lower guide barrel 14, and the fourth adjustment tooth 20 is disposed under the outer surface of the lower adjustment shaft 19. One end of the lower adjustment shaft 19 is rotatably connected to the inner side wall of the pipe 1, and the other end passes through the side wall of the pipe 1 to the outer side of the pipe 1.

[0089] The difference is:

[0090] A lower sealing ring 21 is provided at the penetration point between the lower adjusting shaft 19 and the pipeline 1. The lower adjusting shaft 19 and the lower sealing ring 21 are interference fit. A lower adjusting handle 22 is provided at the end of the lower adjusting shaft 19 located outside the pipeline 1.

[0091] Working principle: During use, assuming the needle of the syringe is located at the lower end of tubing 1, rotate the lower adjustment handle 22 to create a certain gap between the lower rubber valve 17 and the elliptical through-hole 3 in the middle layer. Pull the syringe, and the liquid sequentially passes through the remaining four through-holes of the upper plate 6, the four elliptical through-holes 3 in the middle layer, and the through-holes of the lower plate 15, drawing a certain amount of liquid into the syringe. Due to the characteristics of the lower rubber valve 17, if backflow occurs, the four elliptical through-holes 3 in the middle layer that allow flow will be blocked by the lower rubber valve 17.

[0092] Rotate the lower adjustment handle 22 to make the lower rubber valve 17 fit tightly against the elliptical through hole 3 of the middle layer. Rotate the upper adjustment handle 13 to create a certain gap between the upper rubber valve 8 and the elliptical through hole 3 of the middle layer. Push the syringe, and the liquid will pass through the remaining four through holes of the lower plate 15, the four elliptical through holes 3 of the middle layer, and the through holes of the upper plate 6 in sequence, allowing the liquid in the syringe to be discharged with gas to the upper end of the tubing 1. Due to the characteristics of the upper rubber valve 8, if backflow occurs, the four elliptical through holes 3 of the middle layer that allow flow will be blocked by the lower rubber valve 17.

[0093] Repeat the above steps several times, and the liquid that removes the gas will be obtained in the syringe.

[0094] Currently, the technical solution of this application has undergone pilot testing, which is a small-scale experiment before the product is mass-produced. After the pilot testing was completed, a user survey was conducted on a small scale, and the survey results showed that user satisfaction was high. Now, preparations are underway for the formal production and industrialization of the product (including intellectual property risk warning surveys).

[0095] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A backflow valve with adjustable check direction, used on pipeline (1), characterized in that: It includes an intermediate layer plate (2) fixedly installed on the pipeline (1), an upper adjustment device installed above the intermediate layer plate (2), and a lower adjustment device installed below the intermediate layer plate (2); The intermediate layer plate (2) is provided with eight elliptical through holes (3) distributed around the center of the intermediate layer plate (2); The upper adjustment device includes an upper guide barrel (5) with its opening facing downwards, an upper plate (6) fixedly disposed at the lower end of the upper guide barrel (5) and located on the outer side wall of the upper guide barrel (5), eight upper plate through holes (7) disposed on the upper plate (6), four upper rubber valves (8) disposed between the upper plate (6) and the middle plate (2) and fixedly connected to the upper plate (6), and an upper position adjustment device disposed on one side of the upper guide barrel (5). The upper plate through holes (7) are disposed between the edges of the upper guide barrel (5) and the upper plate (6) and divide the upper plate (6) evenly. The upper plate through holes (7) are disposed opposite to the elliptical through holes (3). The upper rubber valves (8) are disposed alternately at the positions of the upper plate through holes (7). The lower adjustment device includes an upward-opening lower guide barrel (14), a lower plate (15) fixedly disposed on the upper end of the lower guide barrel (14) and located on the outer side wall of the lower guide barrel (14), eight lower plate through holes (16) disposed on the lower plate (15), four lower rubber valves (17) disposed between the lower plate (15) and the middle plate (2) and fixedly connected to the lower plate (15), and a lower position adjustment device disposed on one side of the lower guide barrel (14). The lower plate through holes (16) are disposed between the edges of the lower guide barrel (14) and the lower plate (15) and divide the lower plate (15) evenly. The lower plate through holes (16) are disposed opposite to the elliptical through holes (3). The lower rubber valves (17) are staggered at the positions of the lower plate through holes (16). The lower rubber valves (17) and the upper rubber valves (8) are staggered. When in use, if the needle of the syringe is located at the lower end of the tubing (1), the lower position adjustment device drives the lower guide barrel (14) to move, so that the lower rubber valve (17) and the elliptical through hole (3) of the middle plate (2) are separated; when the syringe is pulled, the liquid passes through the remaining four upper plate through holes (7) of the upper plate (6), the four elliptical through holes (3) of the middle plate (2) and the lower plate through hole (16) in sequence, so that a certain amount of liquid is drawn from the syringe. If backflow occurs, the four elliptical through holes (3) of the middle plate (2) that can flow through will be blocked by the lower rubber valve (17); The lower position adjustment device drives the lower guide barrel (14) to move, so that the lower rubber valve (17) is in close contact with the elliptical through hole (3) of the middle plate (2); the upper position adjustment device drives the upper guide barrel (5) to move, so that the upper rubber valve (8) and the elliptical through hole (3) of the middle plate (2) are separated, pushing the syringe, and the liquid passes through the remaining four lower plate through holes (16) of the lower plate (15), the four elliptical through holes (3) of the middle plate (2) and the upper plate through hole (7) in sequence, so that the liquid in the syringe along with the gas is discharged to the upper end of the pipeline (1). If backflow occurs, the four elliptical through holes (3) of the middle plate (2) that can flow are blocked by the lower rubber valve (17).

2. The adjustable check valve according to claim 1, characterized in that: A guide post (4) is provided through the middle position of the intermediate layer plate (2), and the elliptical through hole (3) is distributed between the guide post (4) and the edge of the intermediate layer plate (2). The upper adjustment device and the lower adjustment device are both provided on the guide post (4).

3. A backflow valve with adjustable check direction according to claim 2, characterized in that: The upper position adjustment device includes a first adjustment tooth (9) disposed on the side wall of the upper guide barrel (5), an upper adjustment shaft (10) disposed on one side of the upper guide barrel (5), and a second adjustment tooth (11) disposed on the upper adjustment shaft (10) and meshing with the first adjustment tooth (9). The first adjustment tooth (9) is vertically distributed on the side wall of the upper guide barrel (5), and the second adjustment tooth (11) is disposed on the outer surface of the upper adjustment shaft (10). One end of the upper adjustment shaft (10) is rotatably connected to the inner side wall of the pipeline (1), and the other end passes through the side wall of the pipeline (1) to the outer side of the pipeline (1).

4. A backflow valve with adjustable check direction according to claim 3, characterized in that: An upper sealing ring (12) is provided at the penetration point between the upper adjusting shaft (10) and the pipeline (1), and the upper adjusting shaft (10) and the upper sealing ring (12) are interference fit.

5. A backflow valve with adjustable check direction according to claim 4, characterized in that: The upper adjustment shaft (10) is provided with an upper adjustment handle (13) at one end located outside the pipeline (1).

6. A backflow valve with adjustable check direction according to claim 5, characterized in that: The lower position adjustment device includes a third adjustment tooth (18) disposed on the side wall of the lower guide barrel (14), a lower adjustment shaft (19) disposed on one side of the lower guide barrel (14), and a fourth adjustment tooth (20) disposed on the lower adjustment shaft (19) and meshing with the third adjustment tooth (18). The third adjustment tooth (18) is vertically distributed under the side wall of the lower guide barrel (14), and the fourth adjustment tooth (20) is disposed under the outer surface of the lower adjustment shaft (19). One end of the lower adjustment shaft (19) is rotatably connected to the inner side wall of the pipeline (1), and the other end passes through the side wall of the pipeline (1) to the outer side of the pipeline (1).

7. A backflow valve with adjustable check direction according to claim 6, characterized in that: A lower sealing ring (21) is provided at the penetration point between the lower adjusting shaft (19) and the pipeline (1). The lower adjusting shaft (19) and the lower sealing ring (21) are interference fit. A lower adjusting handle (22) is provided at the end of the lower adjusting shaft (19) located outside the pipeline (1).

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