Four-way ball valve and hemodialysis device

Abstract

The utility model discloses a four-way ball valve which comprises a valve body, four through holes are sequentially formed in the periphery of the valve body and communicated with an inner cavity of the valve body, and the four through holes are a through hole A, a through hole B, a through hole a and a through hole b respectively, the through hole A and the through hole B are arranged in a 180-degree opposite mode, and the through hole a and the through hole b are arranged in a 180-degree opposite mode. The ball core comprises an upper ball body and a lower ball body, the upper ball body is provided with three upper flow holes which are communicated with one another, the lower ball body is provided with three lower flow holes which are communicated with one another, and when the ball core is rotationally arranged in the inner cavity of the valve body, the three upper flow holes correspond to the through hole A, the through hole a and the through hole B respectively, and the three lower flow holes correspond to the through hole A, the through hole b and the through hole B respectively; an inner cavity of the valve body is provided with an upper check block used for preventing the through hole B from communicating with any upper flow hole, and the inner cavity of the valve body is provided with a lower check block used for preventing the through hole A from communicating with any lower flow hole. Flow path switching can be achieved only by rotating the ball core by 180 degrees, cost is saved, the switch does not need to be switched on and off in sequence in the switching process, and instant switching of the flow paths can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and more specifically, to a four-way ball valve. In addition, the utility model also relates to a hemodialysis device including the above four-way ball valve. Background Art

[0002] Four-way ball valves are often used in hemodialysis devices, which have four ports (such as ports A, a, B, and b) all connected to pipelines, and the on-off and flow direction of the fluid are controlled by rotating the ball core. Existing ball valves only achieve one-way or three-way arbitrary two-way connection, and cannot meet the requirement of switching the flow path from A→a, B→b to A→b, B→a at the same time. Currently, if a four-way ball valve wants to meet the above flow path switching requirement, as Figure 1 shown, usually multiple pipelines need to be installed, that is, port A is connected to ports a and b respectively through two pipelines, port B is connected to ports a and b respectively through two pipelines, and switches are provided on each pipeline. In this way, first, the pipelines of A→a and B→b are disconnected, and then the pipelines of A→b and B→a are opened to complete the flow path switching. However, the four-way ball valve with the above settings not only requires multiple pipelines to be set, increasing costs, but also has a delay during flow path switching.

[0003] In summary, how to provide a four-way ball valve with low cost and instant flow path switching is an urgent problem to be solved by those skilled in the art at present. Summary of the Utility Model

[0004] In view of this, the purpose of the utility model is to provide a four-way ball valve, which has low cost and can achieve instant switching of the flow path.

[0005] Another purpose of the utility model is to provide a hemodialysis device including the above four-way ball valve.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A four-way ball valve includes:

[0008] A valve body, on which four through holes are sequentially arranged around and all communicate with its inner cavity. The four through holes are respectively through hole A and through hole B which are arranged opposite to each other at 180°, and through hole a and through hole b which are arranged opposite to each other at 180°.

[0009] A ball core, including an upper sphere and a lower sphere. The upper sphere is provided with three upper flow holes communicating with each other, and the lower sphere is provided with three lower flow holes communicating with each other. When the ball core rotates and is placed in the inner cavity of the valve body, the three upper flow holes are respectively arranged corresponding to through hole A, through hole a, and through hole B, and the three lower flow holes are respectively arranged corresponding to through hole A, through hole b, and through hole B.

[0010] Wherein, an upper stopper for blocking the flow between the through hole B and any one of the upstream holes is provided in the inner cavity of the valve body, and a lower stopper for blocking the flow between the through hole A and any one of the downstream holes is provided in the inner cavity of the valve body.

[0011] Preferably, the valve body includes an upper valve body and a lower valve body connected as a whole. The side edges of the upper valve body and the lower valve body form the through hole A, the through hole a, the through hole B, and the through hole b, and an upper valve cavity and a lower valve cavity are formed in the middle of the upper valve body and the lower valve body;

[0012] Wherein, the upper sphere is located in the upper valve cavity, and the upper stopper is arranged at a position corresponding to the through hole B in the upper valve cavity, and its contour dimension is larger than the contour dimension of any one of the upstream holes and smaller than the contour dimension of the through hole B;

[0013] The lower sphere is located in the lower valve cavity, and the lower stopper is arranged at a position corresponding to the through hole A in the lower valve cavity, and its contour dimension is larger than the contour dimension of any one of the downstream holes and smaller than the contour dimension of the through hole B.

[0014] Preferably, a through hole is provided in the middle of the upper valve body. The top end of the rotating rod is connected to a rotation control member, and the bottom end passes through the through hole and is connected to the ball core.

[0015] Preferably, a gland hole coaxial with and communicating with the through hole is further provided in the middle of the upper valve body. The packing gland is sleeved on the rotating rod and is threadedly connected to the gland hole.

[0016] Preferably, a sealing packing is provided between the packing gland and the gland hole, and / or a sealing ring is provided between the rotating rod and the through hole.

[0017] Preferably, the ball core is of a shell structure, and a horizontal partition is provided inside the ball core to form the upper sphere and the lower sphere.

[0018] Preferably, the contour dimensions of the three upstream holes and the three downstream holes are the same.

[0019] A hemodialysis device includes the four-way ball valve described in any one of the above.

[0020] Compared with the above background art, the four-way ball valve provided by the present utility model can achieve instantaneous switching of the flow path. The first flow path is through hole A → a, through hole B → b, and the second flow path is through hole A → b, through hole B → a. The specific process of switching between the two flow paths is as follows: Both through hole A and through hole B are connected to the liquid inlet pipe, and both through hole a and through hole b are connected to the liquid outlet pipe. When the ball core is in the initial state, that is, when the ball core is in the first valve position, the first upper flow hole, the second upper flow hole, and the third upper flow hole correspond to through hole A, through hole a, and through hole B one by one, and the first lower flow hole, the second lower flow hole, and the third lower flow hole correspond to through hole A, through hole b, and through hole B one by one. At this time, the upper stopper blocks the connection between through hole B and the third upper flow hole, and the lower stopper blocks the connection between through hole A and the first lower flow hole. Liquid enters from through hole A and flows through the first upper flow hole and the second upper flow hole in sequence and then exits from through hole a. At the same time, the fluid enters from through hole B and flows through the third lower flow hole and the second lower flow hole in sequence and then exits from through hole b. That is, through hole A is connected to through hole a, and through hole B is connected to through hole b to form the first flow path; when the ball core is rotated counterclockwise by 180° from the first valve position to the second valve position, the first upper flow hole, the second upper flow hole, and the third upper flow hole correspond to through hole B, through hole b, and through hole A one by one, and the first lower flow hole, the second lower flow hole, and the third lower flow hole correspond to through hole B, through hole a, and through hole A one by one. At this time, the upper stopper blocks the connection between through hole B and the first upper flow hole, and the lower stopper blocks the connection between through hole A and the third lower flow hole. Liquid enters from through hole A and flows through the third upper flow hole and the second upper flow hole in sequence and then exits from through hole b. At the same time, the fluid enters from through hole B and flows through the first lower flow hole and the second lower flow hole in sequence and then exits from through hole a. That is, through hole A is connected to through hole b, and through hole B is connected to through hole a to form the second flow path; when the ball core is rotated clockwise by 180° from the second valve position, it can be switched back to the first flow path. Therefore, compared with the existing four-way ball valve that realizes flow path switching by adding pipelines and switches, in this application, the flow path can be switched only by rotating the ball core by 180°, which saves costs, and there is no need to successively turn on and off the switch during the switching process, and instantaneous switching of the flow path can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0022] Figure 1 Schematic diagram of the design solution of the four-way ball valve in the prior art;

[0023] Figure 2 Schematic diagram of the structure of the four-way ball valve provided by the present utility model;

[0024] Figure 3Explosion diagram of the four-way ball valve provided by the present utility model;

[0025] Figure 4 Cross-sectional schematic diagram of the four-way ball valve provided by the present utility model;

[0026] Figure 5 Longitudinal sectional schematic diagram of the four-way ball valve provided by the present utility model;

[0027] Figure 6 Structural schematic diagram of the ball core provided by the present utility model;

[0028] Figure 7 Rear view of the ball core provided by the present utility model;

[0029] Figure 8 Left view of the ball core provided by the present utility model;

[0030] Figure 9 Schematic diagram of the upper sphere of the four-way ball valve provided by the present utility model in the first valve position;

[0031] Figure 10 Schematic diagram of the upper sphere of the four-way ball valve provided by the present utility model in the second valve position;

[0032] Figure 11 Schematic diagram of the upper sphere of the four-way ball valve provided by the present utility model in the third valve position;

[0033] Figure 12 Schematic diagram of the lower sphere of the four-way ball valve provided by the present utility model in the first valve position;

[0034] Figure 13 Schematic diagram of the lower sphere of the four-way ball valve provided by the present utility model in the second valve position;

[0035] Figure 14 Schematic diagram of the lower sphere of the four-way ball valve provided by the present utility model in the third valve position.

[0036] Reference numerals:

[0037] 1 - valve body; 12 - through hole A; 13 - through hole a; 14 - through hole B; 15 - through hole b; 16 - upper valve body; 17 - lower valve body; 18 - upper valve cavity; 19 - lower valve cavity;

[0038] 2 - ball core; 21 - upper sphere; 211 - first upper flow hole; 212 - second upper flow hole; 213 - third upper flow hole; 22 - lower sphere; 221 - first lower flow hole; 222 - second lower flow hole; 223 - third lower flow hole; 23 - partition;

[0039] 3 - Upper stopper; 4 - Lower stopper; 5 - Rotary rod; 6 - Rotary control member; 7 - Stuffing gland; 8 - Sealing packing; 9 - Sealing ring. Detailed implementation manner

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] The core of the present invention is to provide a four-way ball valve, which has a low cost and can realize instant switching of the flow path.

[0042] It should be noted that in this embodiment, the orientation or positional relationship indicated by "upper", "lower", "front", "rear", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0043] Please refer to Figure 2 , Figure 3 and Figure 6 , the present application provides a four-way ball valve, including a valve body 1 and a ball core 2. There are four through holes arranged in sequence around the valve body 1 and all communicating with its inner cavity. The four through holes are through hole A12 and through hole B14 arranged opposite to each other at 180°, and through hole a13 and through hole b15 arranged opposite to each other at 180°; the ball core 2 includes an upper sphere 21 and a lower sphere 22. The upper sphere 21 is provided with three upper flow holes communicating with each other, and the lower sphere 22 is provided with three lower flow holes communicating with each other. When the ball core 2 rotates and is placed in the inner cavity of the valve body 1, the three upper flow holes are respectively arranged corresponding to through hole A12, through hole a13, and through hole B14, and the three lower flow holes are respectively arranged corresponding to through hole A12, through hole b15, and through hole B14.

[0044] Among them, an upper stopper 3 for blocking the flow between through hole B14 and any upper flow hole is provided in the inner cavity of the valve body 1, and a lower stopper 4 for blocking the flow between through hole A12 and any lower flow hole is provided in the inner cavity of the valve body 1.

[0045] It should be noted that as Figure 2 shown, through hole A12, through hole a13, through hole B14, and through hole b15 are arranged at intervals in sequence around the circumferential direction of the valve body 1. Through hole A12, through hole a13, through hole B14, and through hole b15 all communicate with the inner cavity of the valve body 1, and through hole A12 and through hole B14, as well as through hole a13 and through hole b15, are arranged opposite to each other at 180°.

[0046] Please refer to Figures 6 to 9 , the ball core 2 is composed of two independent upper spheres 21 and lower spheres 22. The first upper flow hole 211, the second upper flow hole 212 and the third upper flow hole 213 are sequentially arranged on the upper sphere 21 along the arrangement path of the through hole A12, the through hole a13, and the through hole B14 and are interconnected with each other. Even if the included angle between the center lines of the first upper flow hole 211 and the second upper flow hole 212 is the same as the included angle between the center lines of the through hole A12 and the through hole a13, and the included angle between the center lines of the second upper flow hole 212 and the third upper flow hole 213 is the same as the included angle between the center lines of the through hole a13 and the through hole B14, the second upper flow hole 212 is arranged between the first upper flow hole 211 and the second upper flow hole 212 which are arranged opposite to each other at 180°. At the same time, the first lower flow hole 221, the second lower flow hole 222 and the third lower flow hole 223 are sequentially arranged on the lower sphere 22 along the arrangement path of the through hole A12, the through hole b15, and the through hole B14 and are interconnected with each other. Even if the included angle between the center lines of the first lower flow hole 221 and the second lower flow hole 222 is the same as the included angle between the center lines of the through hole A12 and the through hole b15, and the included angle between the center lines of the second lower flow hole 222 and the third lower flow hole 223 is the same as the included angle between the center lines of the through hole b15 and the through hole B14, the second lower flow hole 222 is arranged between the first lower flow hole 221 and the second lower flow hole 222 which are arranged opposite to each other at 180°. In addition, since the through hole A12, the through hole a13, the through hole B14 and the through hole b15 are sequentially arranged in a circle, the first upper flow hole 211 and the first lower flow hole 221 are located on the front side of the ball core 2 and are arranged vertically opposite to each other, the third upper flow hole 213 and the third lower flow hole 223 are located on the rear side of the ball core 2 and are arranged vertically opposite to each other, and the second upper flow hole 212 and the second lower flow hole 222 are respectively located on the left side and the right side of the ball core 2 and are arranged vertically. Therefore, when the ball core 2 is in the first valve position, the first upper flow hole 211, the second upper flow hole 212 and the third upper flow hole 213 correspond to the through hole A12, the through hole a13, and the through hole B14 one by one, as Figure 9 shown, and at the same time, the first lower flow hole 221, the second lower flow hole 222 and the third lower flow hole 223 correspond to the through hole A12, the through hole b15, and the through hole B14 one by one, as Figure 12 shown. When the ball core 2 is rotated 180° from the first valve position to the second valve position, the first upper flow hole 211, the second upper flow hole 212 and the third upper flow hole 213 correspond to the through hole B14, the through hole b15, and the through hole A12 one by one, as Figure 10 shown, and at the same time, the first lower flow hole 221, the second lower flow hole 222 and the third lower flow hole 223 correspond to the through hole B14, the through hole a13, and the through hole A12 one by one, as Figure 13 shown.

[0047] Please refer to Figures 9 to 14, the inner cavity of the valve body 1 is in sealed cooperation with the ball core 2, and the fluid flow between the four through holes is only realized through the connection of the upper and lower flow holes of the ball core 2. An upper stopper 3 is provided at the connection between the inner cavity of the valve body 1 and the through hole B14, and the contour dimension of the upper stopper 3 is smaller than the contour dimension of the through hole B14 to prevent hindering the fluid from entering the lower sphere 22 through the through hole B14, and the contour dimension of the upper stopper 3 is larger than the contour dimension of any upper flow hole to block the fluid from entering the upper sphere 21 through B, so that the upper sphere 21 is only fed with liquid through the through hole A12; A lower stopper 4 is provided at the connection between the inner cavity of the valve body 1 and the through hole A12, and the contour dimension of the lower stopper 4 is smaller than the contour dimension of the through hole A12 to prevent hindering the fluid from entering the upper sphere 21 through the through hole A12, and the contour dimension of the lower stopper 4 is larger than the contour dimension of any lower flow hole to block the fluid from entering the lower sphere 22 through A, so that the lower sphere 22 is only fed with liquid through the through hole B14.

[0048] The four-way ball valve arranged with the above structure can realize the instantaneous switching of two flow paths. The first flow path is through hole A → a, through hole B → b, and the second flow path is through hole A → b, through hole B → a. The specific process of switching between the two flow paths is that both the through hole A12 and the through hole B14 are connected to the liquid inlet pipe, and both the through hole a13 and the through hole b15 are connected to the liquid outlet pipe. When the ball core 2 is in the initial state, that is, when the ball core 2 is in the first valve position, the first upper flow hole 211, the second upper flow hole 212, and the third upper flow hole 213 correspond to the through hole A12, the through hole a13, and the through hole B14 one by one, and the first lower flow hole 221, the second lower flow hole 222, and the third lower flow hole 223 correspond to the through hole A12, the through hole b15, and the through hole B14 one by one. At this time, the upper stopper 3 blocks the through hole B14 from the third upper flow hole 213, and the lower stopper 4 blocks the through hole A12 from the first lower flow hole 221. The liquid enters from the through hole A12 and flows through the first upper flow hole 211 and the second upper flow hole 212 of the upper sphere 21 in sequence and then exits from the through hole a13, as Figure 9 shown, and at the same time, the fluid enters from the through hole B14 and flows through the third lower flow hole 223 and the second lower flow hole 222 of the lower sphere 22 in sequence and then exits from the through hole b15, as Figure 12 shown, that is, the through hole A12 is connected to the through hole a13, and the through hole B14 is connected to the through hole b15 to form the first flow path; When the ball core 2 is rotated counterclockwise 180° from the first valve position to the second valve position, the first upper flow hole 211, the second upper flow hole 212, and the third upper flow hole 213 correspond to the through hole B14, the through hole b15, and the through hole A12 one by one, and the first lower flow hole 221, the second lower flow hole 222, and the third lower flow hole 223 correspond to the through hole B14, the through hole a13, and the through hole A12 one by one. At this time, the upper stopper 3 blocks the through hole B14 from the first upper flow hole 211, and the lower stopper 4 blocks the through hole A12 from the third lower flow hole 223. The liquid enters from the through hole A12 and flows through the third upper flow hole 213 and the second upper flow hole 212 of the upper sphere 21 in sequence and then exits from the through hole b15, as Figure 10As shown, while the fluid enters through the through-hole B14 and successively flows through the first downstream hole 221 and the second downstream hole 222 of the lower sphere 22 and then exits through the through-hole a13, as Figure 13 shown, that is, the through-hole A12 communicates with the through-hole b15, and the through-hole B14 communicates with the through-hole a13 to form a second flow path; when the ball core 2 is rotated clockwise by 180° from the second valve position, the first flow path can be switched again. Therefore, compared with the existing four-way ball valve that realizes the flow path switching by adding pipelines and switches, the present application can realize the flow path switching only by rotating the ball core 2 by 180°, saving costs, and there is no need to successively turn on and off the switch during the switching process, and the flow path can be instantaneously switched.

[0049] To provide a valve body 1 structure with high structural strength and strong stability, on the basis of the above embodiment, please refer to Figure 3 , the valve body 1 includes an upper valve body 16 and a lower valve body 17. Both the upper valve body 16 and the lower valve body 17 are composed of two arc-shaped shells intersecting in the middle. The two are connected into an integrated structure, so that the valve body 1 has good structural strength and stability. It should be noted that the specific connection method between the upper valve body 16 and the lower valve body 17 is determined by their materials. If plastic materials are used, ultrasonic welding can be used. If metal materials are used, through-holes need to be drilled in both the upper and lower valve bodies, and then they are connected into an integrated body by screws and nuts. In addition, the four side edges of the upper valve body 16 and the lower valve body 17 correspond to form the through-hole A12, the through-hole a13, the through-hole B14 and the through-hole b15. An upper valve cavity 18 and a lower valve cavity 19 are formed in the middle of the upper valve body 16 and the lower valve body 17. The upper valve cavity 18 and the lower valve cavity 19 together form the inner cavity of the valve body 1.

[0050] In addition, the upper valve chamber 18 is provided with a sealing and rotating fit with the upper spherical body 21. Moreover, at the position of the upper valve chamber 18 corresponding to the through hole B14, a upper stop block 3 is arranged. The contour dimension of the upper stop block 3 is larger than the contour dimension of any upper flow hole and smaller than the contour dimension of the through hole B14, so as to ensure that the upper spherical body 21 only receives liquid through the through hole A12. The lower valve chamber 19 is provided with a sealing and rotating fit with the lower spherical body 22. And at the position of the lower valve chamber 19 corresponding to the through hole A12, a lower stop block 4 is arranged. The contour dimension of the lower stop block 4 is larger than the contour dimension of any lower flow hole and smaller than the contour dimension of the through hole B14, so as to ensure that the lower spherical body 22 only receives liquid through the through hole B14. In this way, the through hole A12 and the through hole B14 can be connected to different liquid inlet pipes to conduct different liquid transports. The specific implementation manner is that the through hole A12 is connected to the I liquid inlet pipe, and the through hole B14 is connected to the II liquid inlet pipe. Correspondingly, the through hole a13 is connected to the I liquid outlet pipe, and the through hole b15 is connected to the II liquid outlet pipe. In the first flow path, that is, the through hole A → a, the through hole B → b, the liquid in the I liquid inlet pipe flows into the I liquid outlet pipe, and the liquid in the II liquid inlet pipe flows into the II liquid outlet pipe. In the second flow path, that is, the through hole A → b, the through hole B → a, the liquid in the I liquid inlet pipe flows into the II liquid outlet pipe, and the liquid in the II liquid inlet pipe flows into the I liquid outlet pipe, so that the liquid in the I liquid inlet pipe or the II liquid inlet pipe has two independent transport paths, ensuring that the liquid is not mixed and contaminated with other liquids.

[0051] Optionally, the length and width dimensions of the through hole A12, the through hole a13, the through hole B14, and the through hole b15 are all the same, which is convenient for the upper valve body 16 and the lower valve body 17 to be butt-welded, improves the welding quality, and further improves the structural strength of the valve body 1.

[0052] For facilitating the control of the rotation action of the ball core 2, on the basis of the above-mentioned embodiment, please refer to Figure 4 and Figure 5 , a perforation is provided in the middle of the upper valve body 16. The top end of the rotating rod 5 is connected to the rotation control member 6, and the bottom end passes through the perforation and is connected to the ball core 2, so that an operator controls the rotation control member 6 to drive the ball core 2 to rotate to achieve an instantaneous switching of the flow path, thereby facilitating the instantaneous switching action of the flow path.

[0053] Optionally, the rotation control member 6 is a handle, so that the operator manually rotates the handle to drive the ball core 2 to rotate to achieve an instantaneous switching of the flow path. Or, the rotation control member 6 is a driving motor, the output shaft of the driving motor is connected to the top end of the rotating rod 5, and the ball core 2 is driven to rotate by the driving motor to achieve an instantaneous switching of the flow path. This method saves time and effort.

[0054] To prevent the liquid in the valve body 1 from leaking out, on the basis of the above-mentioned embodiment, please refer to Figure 4 , a gland hole coaxial with and communicating with the perforation is further provided in the middle of the upper valve body 16. The packing gland 7 is sleeved on the rotating rod 5 and is threadedly connected to the gland hole, so that a pressing force is generated between the packing gland 7 and the gland hole, achieving the effect of preventing the liquid flowing through the ball core 2 from leaking out, that is, ensuring the sealing of the valve body 1.

[0055] Further, a sealing packing 8 is provided between the stuffing gland 7 and the gland hole, and / or a sealing ring 9 is provided between the screw rod 5 and the perforation to improve the sealing performance of the valve body 1 and prevent liquid leakage, such as Figure 4 shown.

[0056] To provide a ball core 2 structure that is lightweight and allows liquid to flow easily, based on the above embodiments, please refer to Figure 5 and Figure 6 , the ball core 2 is a shell structure. Even if the inside of the ball core 2 is hollow, and a horizontal partition 23 is provided inside the ball core 2. The partition 23 divides the ball core 2 into a non-communicating upper sphere 21 and a lower sphere 22. The ball core 2 with this structure is lightweight, facilitating the rotation operation of the ball core 2. Moreover, both the upper and lower spheres 22 are hollow inside, which can reduce the liquid flow resistance and allow the liquid to flow easily.

[0057] Optionally, the contour dimensions of the three upstream holes and the three downstream holes are the same. When machining the ball core 2, the upper and downstream holes can be formed by pressing the ball core 2 with the same hole press, facilitating the machining and production of the ball core 2.

[0058] To expand the flow path of the four-way ball valve of the present application, based on the above embodiments, the through hole A12, the through hole a13, the through hole B14, and the through hole b15 are evenly distributed around the circumference of the valve body 1 in sequence, and the included angle between the centerlines of any two adjacent ones is 90°. It should be noted that at this time, the included angle between the centerlines of any two adjacent upstream holes is 90°, the included angle between the centerlines of any two adjacent downstream holes is 90°, and on the basis that the contour dimensions of the three upstream holes and the three downstream holes are the same, the three upstream holes are rotationally symmetric up and down with the initial positions of the three downstream holes after rotating 180° around the center of the ball core 2.

[0059] When the ball core 2 is rotated counterclockwise 90° from the first valve position to the third valve position, the first upstream hole 211, the second upstream hole 212, the third upstream hole 213 correspond to the through hole b15, the through hole A12, the through hole a13 one by one, and the first downstream hole 221, the second downstream hole 222, the third downstream hole 223 correspond to the through hole b15, the through hole B14, the through hole a13 one by one. At this time, liquid enters from the through hole A12. A part of the liquid flows through the second upstream hole 212 and the first upstream hole 211 of the upper sphere 21 in sequence and then exits from the through hole b15, and another part of the liquid flows through the second upstream hole 212 and the third upstream hole 213 of the upper sphere 21 in sequence and then exits from the through hole a13, such as Figure 11 shown. At the same time, liquid enters from the through hole B14. A part of the liquid flows through the second downstream hole 222 and the first downstream hole 221 of the lower sphere 22 in sequence and then exits from the through hole b15, and another part of the liquid flows through the second downstream hole 222 and the third downstream hole 223 of the lower sphere 22 in sequence and then exits from the through hole a13, such as Figure 14As shown, the third flow path of through holes A→a, A→b, B→a, and B→b is formed, thus expanding the flow path of the four-way ball valve of the present application, and further improving the applicability of the four-way ball valve of the present application to meet the requirements of various regulation working conditions.

[0060] In addition to the above four-way ball valve, the present utility model also provides a hemodialysis device including the four-way ball valve disclosed in the above embodiment. For the structures of other parts of the hemodialysis device, reference can be made to the prior art and will not be elaborated herein.

[0061] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0062] The various embodiments in this specification are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0063] The above has introduced in detail a four-way ball valve and a hemodialysis device provided by the present utility model. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A four-way ball valve, characterized in that: include: The valve body (1) is provided with four through holes in sequence around the valve body and are all connected to the inner cavity thereof, wherein the four through holes include a through hole A (12) and a through hole B (14) which are arranged opposite to each other at 180 degrees, and a through hole a (13) and a through hole b (15) which are arranged opposite to each other at 180 degrees; The ball core (2) comprises an upper ball body (21) and a lower ball body (22), wherein the upper ball body (21) is provided with three mutually connected upper flow holes, and the lower ball body (22) is provided with three mutually connected lower flow holes, and when the ball core (2) is rotated and placed in the inner cavity of the valve body (1), the three upper flow holes are respectively arranged corresponding to the through hole A (12), the through hole a (13), and the through hole B (14), and the three lower flow holes are respectively arranged corresponding to the through hole A (12), the through hole b (15), and the through hole B (14); The inner cavity of the valve body (1) is provided with an upper stopper (3) for blocking the flow between the through hole B (14) and any of the upper flow holes, and the inner cavity of the valve body (1) is provided with a lower stopper (4) for blocking the flow between the through hole A (12) and any of the lower flow holes.

2. The four-way ball valve according to claim 1, characterized in that: The valve body (1) comprises an upper valve body (16) and a lower valve body (17) which are connected as one body, the side edges of the upper valve body (16) and the lower valve body (17) forming the through hole A (12), the through hole a (13), the through hole B (14) and the through hole b (15), and the middle of the upper valve body (16) and the lower valve body (17) forming an upper valve cavity (18) and a lower valve cavity (19); The upper sphere (21) is located in the upper valve cavity (18), and the upper stopper (3) is provided at a position of the upper valve cavity (18) corresponding to the through hole B (14), and its outline size is larger than the outline size of any of the upper flow holes and smaller than the outline size of the through hole B (14); The lower sphere (22) is located in the lower valve cavity (19), and the lower stopper (4) is provided at a position of the lower valve cavity (19) corresponding to the through hole A (12), and its outline size is larger than the outline size of any of the lower flow holes and smaller than the outline size of the through hole B (14).

3. The four-way ball valve according to claim 2, characterized in that: A through hole is provided in the middle of the upper valve body (16); the top end of the rotary rod (5) is connected to the rotary control component (6), and the bottom end passes through the through hole and is connected to the ball core (2).

4. The four-way ball valve according to claim 3, characterized in that: A gland hole coaxial with and in communication with the through hole is also provided in the middle of the upper valve body (16); a packing gland (7) is sleeved on the rotary rod (5) and is threadedly connected to the gland hole.

5. The four-way ball valve according to claim 4, characterized in that: A sealing filler (8) is provided between the filler gland (7) and the gland hole, and / or a sealing ring (9) is provided between the rotary rod (5) and the through hole.

6. The four-way ball valve according to claim 1, characterized in that: The ball core (2) is a shell structure, and a horizontal partition (23) is provided inside the ball core (2) to form the upper sphere (21) and the lower sphere (22).

7. The four-way ball valve according to claim 1, characterized in that: The three upper flow holes and the three lower flow holes have the same outline size.

8. A hemodialysis device, characterized in that: A four-way ball valve comprising any one of claims 1 to 7.

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