Check valve with adjustable check direction

Abstract

The invention relates to the technical field of check valves, in particular to a check valve with an adjustable check direction, which comprises a valve body and further comprises an adjusting assembly, a main valve assembly, an auxiliary valve assembly and a drainage assembly, the adjusting assembly is connected with the valve body, the main valve assembly and the auxiliary valve assembly are both connected with the adjusting assembly, and the drainage assembly is connected with the main valve assembly. The main valve assembly and the auxiliary valve assembly divide the interior of the valve body into three cavities which are the left cavity, the middle cavity and the right cavity in sequence from left to right. The valve body is divided into the three cavities through the main valve assembly and the auxiliary valve assembly, the non-return effect is improved, meanwhile, in the process of adjusting the non-return direction of the valve body, a medium which is left in the middle cavity and circulates last time is discharged through the flow discharging assembly, and therefore the medium which is left in the valve body and circulates next time is prevented from polluting the medium which is left in the valve body and circulates next time. And therefore, the quality of the medium flowing each time is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of check valves, and specifically to a check valve with adjustable check direction. Background Art

[0002] A check valve is an automatic valve mainly used to prevent the backflow of media and is widely used in various fluid systems. Its working principle is to use the flow of the fluid itself to drive the opening of the valve flap (or valve core and other components). When the fluid flows in the reverse direction, the valve flap will automatically close to prevent the backflow of the media.

[0003] In some chemical proportioning production processes, even for a single pipeline, a check valve with adjustable check direction may be required. However, existing check valves usually have only one fixed check direction. If multiple-direction check is needed, multiple pipelines usually need to be laid, which will complicate the pipeline system and make the operation of switching pipelines rather cumbersome.

[0004] In response to the above problems, some solutions have been proposed in the prior art. For example, a mechanically linked check valve with adjustable check direction with the publication number CN112145759B can identify the upstream and downstream relationships of the flow direction at the beginning of liquid transportation in the flow path through the pressure values of pressure transmitters at two interfaces, so as to allocate an appropriate check direction; in some chemical raw material proportioning factories, it often occurs that a pipeline needs to introduce two or more media in different directions. Although the prior art realizes the function of adjustable check direction, since two or more different media usually flow through this pipeline, a part of the first introduced medium often remains in the chamber of the valve body after flowing through the valve body. When the next medium is introduced, the flowing medium often mixes with the remaining previous medium in the valve body, thus polluting the next flowing medium and affecting the quality of the subsequently introduced medium.

[0005] Therefore, a check valve with adjustable check direction is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a check valve with adjustable check direction, which solves the problem that the quality of the next flowing medium is affected by the residual medium in the valve body. By setting an adjustment component and a drain component, while using the adjustment component to change the check direction, the residual previous medium inside the valve body is discharged, so as to ensure the quality of the next flowing medium.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] A check valve with adjustable check direction, comprising a valve body, and further comprising an adjusting assembly, a main valve assembly, a sub-valve assembly and a drain assembly. The adjusting assembly is connected to the valve body. The main valve assembly and the sub-valve assembly are both connected to the adjusting assembly. The main valve assembly and the sub-valve assembly divide the interior of the valve body into three chambers, which are, from left to right, a left chamber, a middle chamber and a right chamber. The drain assembly is connected to the valve body. The flow of the medium pushes the main valve assembly to open, and at the same time drives the sub-valve assembly to open synchronously. After the medium stops flowing, the main valve assembly closes and the sub-valve assembly closes slowly. When adjusting the check direction, rotate the adjusting assembly to drive the main valve assembly and the sub-valve assembly to change positions, and at the same time open the drain assembly to discharge the residual medium in the middle chamber. After adjusting to the specified position, close the drain assembly through the adjusting assembly.

[0009] Through the above solution, three chambers are formed by using the main valve assembly and the sub-valve assembly, so that the counter-flow medium must pass through the main valve assembly and the sub-valve assembly to flow back, improving the check effect. After the medium stops flowing, the main valve assembly closes immediately to prevent the medium from flowing back to the upstream, ensuring the check effect. The sub-valve assembly closes slowly, thereby reducing the impact of water hammer caused by the medium flowing back from the right chamber. At the same time, the drain assembly can prevent the medium remaining inside the valve body from contaminating the medium flowing through next time, and can discharge the medium from the middle chamber through the drain assembly when switching the check direction, thereby ensuring the quality of the medium flowing through each time.

[0010] Preferably, the adjusting assembly includes a handwheel, a rotating shaft, a mounting block, a connecting shaft, a plug rod and a stop block. The rotating shaft is connected to the valve body. The handwheel is connected to the upper end of the rotating shaft. The mounting block is connected to the rotating shaft. The connecting shaft is arranged inside the rotating shaft. The plug rod is connected to the connecting shaft. The lower end of the plug rod is conical. The stop blocks are connected to the left and right sides of the rotating shaft. The width of the stop block is greater than the diameter value of the plug rod. There is a gap between the bottom of the stop block and the inner wall of the bottom of the valve body.

[0011] Through the above solution, when it is necessary to adjust the check direction, the staff only needs to rotate the handwheel to adjust the positions of the main valve assembly and the sub-valve assembly, and then adjust the check direction. Since the positions of the main valve assembly and the sub-valve assembly will change when adjusting the check direction, if they are not adjusted to the appropriate positions, it is easy to affect the sealing performance and thus the check effect. The plug rod in this solution can cooperate with the drain assembly. When the main valve assembly and the sub-valve assembly are adjusted to the appropriate positions, insert the plug rod into the drain assembly. While closing the drain assembly, use the drain assembly to limit and fix the rotation position of the handwheel. At the same time, since the lower end of the plug rod is conical, that is, it gradually becomes thicker from bottom to top, the narrower position at its lower end can make the plug rod more conveniently inserted into the drain assembly, and due to its gradually thickening design, it can completely block the drain assembly after being inserted into the drain assembly, thereby ensuring the sealing performance of the check valve during the flow of the medium.

[0012] Preferably, the middle cavity of the valve body is spherical, and the flow discharge assembly is arranged at the lowest point of the middle cavity.

[0013] Through the above solution, the spherical middle cavity can facilitate the position adjustment of the main valve assembly and the sub-valve assembly, and thus facilitate the adjustment of the check direction; the medium remaining in the middle cavity will flow to the lowest point due to the influence of gravity, and then be discharged from the flow discharge assembly, ensuring that there is no residual medium inside the valve body.

[0014] Preferably, the flow discharge assembly includes a flow splitting port and a flow merging port. Both the flow splitting port and the flow merging port are opened on the valve body. The flow splitting port is communicated with the flow merging port and connects the inside of the valve body with the outside. The cross-sectional area of the flow merging port is larger than that of the flow splitting port, and the aperture of the flow splitting port is the same as the diameter value of the plug rod.

[0015] Through the above solution, after the previous medium flow is completed, a part of the medium usually remains in the middle cavity of the valve body. In order to avoid the problem that the medium remains in the valve body and mixes with the medium flowing next time, thus affecting the quality of the medium flowing next time, when adjusting the check direction in this solution, the plug rod will be lifted first to open the flow splitting port. At this time, the medium remaining in the middle cavity will be discharged from the flow splitting port through the flow merging port, and then the residual medium in the valve body will be cleaned; in addition, when adjusting the check direction, if the positions of the main valve assembly and the sub-valve assembly change and do not rotate to the appropriate positions, the plug rod cannot accurately block the flow splitting port, so that the flowing medium will drip from the flow discharge assembly, enabling the staff to discover this problem in time and make adjustments, ensuring the check effect of the check valve.

[0016] Preferably, a main cavity is arranged inside the mounting block; the main valve assembly includes a main fixing plate, a main valve plate, a main connecting rod and a return spring. The main fixing plate is connected to the rotating shaft, the main connecting rod is connected to the mounting block, the main valve plate is connected to the left end of the main connecting rod, and the return spring is arranged inside the main cavity, and its two ends are respectively connected to the main connecting rod and the mounting block.

[0017] Through the above solution, during the process of medium flow, the medium will move the main valve plate to the right, thus connecting the left cavity with the middle cavity. At this time, the main connecting rod will compress the return spring. When the medium stops flowing, the elastic force of the return spring will immediately close the main valve plate, thus ensuring the check effect of the main valve assembly.

[0018] Preferably, a secondary chamber is provided inside the mounting block; the secondary valve assembly includes a secondary fixing plate, a secondary valve plate, a secondary connecting rod, and a compression spring. The secondary fixing plate is connected to the rotating shaft, the secondary connecting rod is connected to the mounting block, the secondary valve plate is connected to the right end of the secondary connecting rod, the compression spring is sleeved on the secondary connecting rod, and its two ends are respectively connected to the mounting block and the secondary valve plate. The reset stroke time of the compression spring is greater than that of the reset spring.

[0019] Through the above solution, during the process of medium flow, the medium located in the middle chamber will push the secondary valve plate to move to the right, thus connecting the middle chamber with the right chamber. At this time, the compression spring will be stretched. Since the reset stroke time of the compression spring is relatively long, when the medium stops flowing, the secondary valve plate will reset at a relatively slow speed, thereby reducing the impact of water hammer caused by the reflux of the medium from the right chamber.

[0020] Preferably, a buffer hole is provided on the mounting block, and the buffer hole connects the middle chamber with the secondary chamber.

[0021] Through the above solution, the secondary connecting rod and the secondary chamber will form a structure similar to a piston. When the secondary connecting rod moves to the right, it will draw in external gas through the buffer hole, and when the secondary connecting rod moves to the left, it needs to squeeze out all the gas in the secondary chamber, thereby slowing down the closing speed of the secondary valve plate and further reducing the water hammer effect.

[0022] Preferably, a first push plate is connected to the right side of the main valve plate, and a second push plate is connected to the left side of the secondary valve plate. The end shapes of the first push plate and the second push plate are matched.

[0023] Through the above solution, since gas will be drawn into the secondary chamber through the buffer hole during the opening process of the secondary valve plate, the opening speed of the secondary valve plate will be significantly lower than that of the main valve plate. Through the arrangement of the first push plate and the second push plate, when the main valve plate opens, it will push the secondary valve plate to open synchronously through the first push plate and the second push plate, thereby ensuring the medium flow efficiency. And when the medium stops flowing, since the first push plate and the second push plate are not fixed together, the main valve plate will immediately move to the left with the first push plate, while the secondary valve plate will slowly close under the action of the gas in the secondary chamber and the compression spring.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. For a check valve with adjustable check direction of the present invention, the valve body is divided into three chambers by the main valve assembly and the secondary valve assembly, improving the check effect. At the same time, during the process of adjusting the check direction of the valve body, the residual medium from the previous flow in the middle chamber is discharged by the flow discharge assembly, thereby preventing the medium remaining inside the valve body from contaminating the medium flowing in the next time, and further ensuring the quality of the medium flowing each time.

[0026] 2. A check valve with adjustable check direction according to the present invention, by setting an adjustment assembly and a flow discharge assembly, on the one hand, it can empty the residual medium in the valve body through the flow discharge assembly, and on the other hand, it can position the adjustment of the positions of the main valve assembly and the sub-valve assembly through the cooperation of the flow diversion port and the insertion rod. When it does not rotate to the appropriate position and the insertion rod cannot accurately block the flow diversion port, the flowing medium will drip from the confluence port, so that the staff can timely discover the problems of the equipment and thus take countermeasures, ensuring the check effect of the check valve.

[0027] 3. A check valve with adjustable check direction according to the present invention, by setting a main valve assembly and a sub-valve assembly, when the medium flows, the main valve plate controls the synchronous opening of the sub-valve plate through the cooperation of the first push plate and the second push plate, thereby ensuring the efficiency of the medium flow. When the medium stops flowing, the main valve plate will immediately close under the action of the return spring, ensuring the check effect of the valve body, while the sub-valve plate will slowly close under the influence of the return stroke time of the compression spring, thereby reducing the influence of the water hammer caused by the reflux of the medium from the right chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of the whole of the present invention;

[0029] Figure 2 is a schematic structural diagram of the valve body after being cut in half of the present invention;

[0030] Figure 3 is a schematic structural diagram of the adjustment assembly of the present invention;

[0031] Figure 4 of the present invention Figure 2 is an enlarged view of part A in;

[0032] Figure 5 is a schematic structural diagram of the main valve assembly and the sub-valve assembly of the present invention;

[0033] Figure 6 of the present invention Figure 3 is an enlarged view of part B in;

[0034] Figure 7 is a motion state diagram of the main valve assembly and the sub-valve assembly during the medium flow of the present invention;

[0035] Figure 8 is a state diagram when adjusting the check direction of the present invention.

[0036] In the figure: 1. Valve body; 101. Left chamber; 102. Intermediate chamber; 103. Right chamber; 2. Adjusting assembly; 201. Handwheel; 202. Rotating shaft; 203. Mounting block; 2031. Main chamber; 2032. Sub-chamber; 2033. Buffer hole; 204. Connecting shaft; 205. Plug rod; 206. Stop block; 3. Main valve assembly; 301. Main fixing plate; 302. Main valve plate; 303. Main connecting rod; 304. Return spring; 305. First push plate; 4. Sub-valve assembly; 401. Sub-fixing plate; 402. Sub-valve plate; 403. Sub-connecting rod; 404. Compression spring; 405. Second push plate; 5. Drainage assembly; 501. Diversion port; 502. Confluence port. Detailed implementation manners

[0037] 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] Please refer to Figures 1 to 8 , the present invention provides a check valve with adjustable check direction, and the technical solution is as follows:

[0039] Specifically, please refer to Figure 1 and Figure 2, a check valve with adjustable check direction, comprising a valve body 1, and further comprising an adjusting component 2, a main valve component 3, a sub-valve component 4 and a flow discharge component 5. The adjusting component 2 is connected to the valve body 1, the main valve component 3 and the sub-valve component 4 are both connected to the adjusting component 2. The main valve component 3 and the sub-valve component 4 divide the interior of the valve body 1 into three chambers, which are, from left to right, a left chamber 101, a middle chamber 102 and a right chamber 103. By forming three chambers with the main valve component 3 and the sub-valve component 4, the reverse-flow medium must pass through the main valve component 3 and the sub-valve component 4 to flow back, improving the check effect. The middle chamber 102 of the valve body 1 is spherical, which can facilitate the position adjustment of the main valve component 3 and the sub-valve component 4, and thus facilitate the adjustment of the check direction. The flow discharge component 5 is arranged at the lowest point of the middle chamber 102. The medium remaining in the middle chamber 102 will flow to the lowest point due to the influence of gravity, and then be discharged from the flow discharge component 5, so as to ensure that there is no residual medium inside the valve body 1. The flow of the medium pushes the main valve component 3 to open, and at the same time drives the sub-valve component 4 to open synchronously, thus ensuring the flow efficiency of the medium. After the medium stops flowing, the main valve component 3 closes immediately to prevent the medium from flowing back to the upstream, ensuring the check effect, while the sub-valve component 4 closes slowly, thereby reducing the influence of water hammer caused by the medium flowing back from the right chamber 103. When adjusting the check direction, rotate the adjusting component 2 to drive the main valve component 3 and the sub-valve component 4 to change positions, and at the same time open the flow discharge component 5 to discharge the residual medium in the middle chamber 102, so as to prevent the residual medium inside the valve body 1 from contaminating the medium flowing in the next time, and thus ensuring the quality of the medium flowing each time. After adjusting to the specified position, close the flow discharge component 5 through the adjusting component 2.

[0040] As an embodiment of the present invention, refer to Figure 3 and Figure 6, the adjusting assembly 2 includes a handwheel 201, a rotating shaft 202, a mounting block 203, a connecting shaft 204, a plug rod 205 and a stop block 206. The rotating shaft 202 is rotatably connected to the valve body 1. The handwheel 201 is connected to the upper end of the rotating shaft 202. An arrow is provided on the upper surface of the handwheel 201, and this arrow points to the flow direction of the medium, which is convenient for observation. When adjusting the check direction, the staff only needs to rotate the handwheel 201 to adjust the positions of the main valve assembly 3 and the sub-valve assembly 4, and then adjust the check direction; the mounting block 203 is connected to the rotating shaft 202. The mounting block 203 is square. A main chamber 2031 is provided on the left side of the mounting block 203, and a sub-chamber 2032 is provided on the right side of the mounting block 203. Both the main chamber 2031 and the sub-chamber 2032 are cylindrical, and the inner diameter value of the main chamber 2031 is smaller than the inner diameter value of the sub-chamber 2032. A buffer hole 2033 is provided on the mounting block 203. The buffer hole 2033 communicates the intermediate chamber 102 with the sub-chamber 2032. When the sub-connecting rod 403 moves to the right, it will extract external gas through the buffer hole 2033, and when the sub-connecting rod 403 moves to the left, it is necessary to squeeze out all the gas in the sub-chamber 2032, so as to slow down the closing speed of the sub-valve plate 402, and further reduce the water hammer effect;

[0041] The connecting shaft 204 is arranged inside the rotating shaft 202. The plug rod 205 is connected to the connecting shaft 204. The lower end of the plug rod 205 is conical. The plug rod 205 can cooperate with the flow discharging assembly 5. After the main valve assembly 3 and the sub-valve assembly 4 are adjusted to the appropriate positions, the plug rod 205 is inserted into the flow discharging assembly 5. While closing the flow discharging assembly 5, the rotating position of the handwheel 201 is limited and fixed by using the flow discharging assembly 5. The stop blocks 206 are connected to the left and right sides of the rotating shaft 202. The width of the stop block 206 is greater than the diameter value of the plug rod 205. A gap is left between the bottom of the stop block 206 and the bottom inner wall of the valve body 1, so as to prevent the stop block 206 from rubbing against the valve body 1 and affecting the rotation of the handwheel 201.

[0042] As an implementation manner of the present invention, refer to Figure 4, the flow discharge component 5 is connected to the valve body 1. The flow discharge component 5 includes a flow splitting port 501 and a flow combining port 502. Both the flow splitting port 501 and the flow combining port 502 are formed on the valve body 1. The flow splitting port 501 is in communication with the flow combining port 502 and connects the interior of the valve body 1 with the outside. When adjusting the check direction, the plug rod 205 is first lifted to open the flow splitting port 501. At this time, the medium remaining in the intermediate cavity 102 will be discharged from the flow combining port 502 through the flow splitting port 501, thereby cleaning the residual medium in the valve body 1. The cross-sectional area of the flow combining port 502 is larger than that of the flow splitting port 501. The aperture of the flow splitting port 501 is the same as the diameter value of the plug rod 205. When adjusting the check direction, the positions of the main valve assembly 3 and the sub-valve assembly 4 change. If they are not rotated to the appropriate positions, the plug rod 205 cannot accurately block the flow splitting port 501, so that the flowing medium will drip from the flow discharge component 5, enabling the staff to promptly discover this problem and make adjustments, ensuring the check effect of the check valve.

[0043] As an implementation manner of the present invention, referring to Figure 2 and Figure 5 , the main valve assembly 3 includes a main fixing plate 301, a main valve plate 302, a main connecting rod 303, and a return spring 304. The main fixing plate 301 is connected to the rotating shaft 202. When the handwheel 201 is rotated, the rotating shaft 202 rotates accordingly, driving the main fixing plate 301 to rotate, thereby adjusting the check direction. The main connecting rod 303 is slidably connected to the mounting block 203. The main valve plate 302 is connected to the left end of the main connecting rod 303. During the flow of the medium, the medium will move the main valve plate 302 to the right, connecting the left chamber 101 with the intermediate cavity 102. The return spring 304 is disposed inside the main chamber 2031, and its two ends are respectively connected to the main connecting rod 303 and the mounting block 203. When the medium stops flowing, the elastic force of the return spring 304 will immediately close the main valve plate 302, thereby ensuring the check effect of the main valve assembly 3;

[0044] The auxiliary valve assembly 4 includes an auxiliary fixed plate 401, an auxiliary valve plate 402, an auxiliary connecting rod 403, and a compression spring 404. The auxiliary fixed plate 401 is connected to the rotating shaft 202, the auxiliary connecting rod 403 is connected to the mounting block 203, and the auxiliary valve plate 402 is connected to the right end of the auxiliary connecting rod 403. During the process of medium flow, the medium located in the intermediate cavity 102 will push the auxiliary valve plate 402 to move to the right, thereby connecting the intermediate cavity 102 with the right cavity 103. The compression spring 404 is sleeved on the auxiliary connecting rod 403, and its two ends are respectively connected to the mounting block 203 and the auxiliary valve plate 402. The reset stroke time of the compression spring 404 is greater than the reset stroke time of the reset spring 304. When the auxiliary valve plate 402 moves to the right, the compression spring 404 is stretched. Due to the longer reset stroke time of the compression spring 404, when the medium stops flowing, the auxiliary valve plate 402 will reset at a relatively slow speed, thereby reducing the impact of water hammer caused by the reflux of the medium from the right cavity 103; A first push plate 305 is connected to the right side of the main valve plate 302, and a second push plate 405 is connected to the left side of the auxiliary valve plate 402. The end shapes of the first push plate 305 and the second push plate 405 are matched with each other.

[0045] Through the above solution, since gas will be drawn into the auxiliary cavity 2032 through the buffer hole 2033 during the opening process of the auxiliary valve plate 402, the opening speed of the auxiliary valve plate 402 will be significantly lower than that of the main valve plate 302. Through the arrangement of the first push plate 305 and the second push plate 405, when the main valve plate 302 opens, the auxiliary valve plate 402 will be pushed to open synchronously through the first push plate 305 and the second push plate 405, thereby ensuring the flow efficiency of the medium. When the medium stops flowing, since the first push plate 305 and the second push plate 405 are not fixed together, the main valve plate 302 will immediately move to the left with the first push plate 305, while the auxiliary valve plate 402 will slowly close under the action of the gas in the auxiliary cavity 2032 and the compression spring 404.

[0046] The specific working principle is as follows: When the medium flows in the valve body 1, it will first push the main valve assembly 3 to open, and at the same time, the main valve assembly 3 will drive the auxiliary valve assembly 4 to open synchronously, thereby ensuring the flow efficiency of the medium;

[0047] Specifically, first, the flowing medium will push the main valve plate 302 to move to the right, thereby connecting the left cavity 101 with the intermediate cavity 102. During this process, the first push plate 305 connected to the main valve plate 302 will push the auxiliary valve plate 402 to move to the right through the second push plate 405 connected to the auxiliary valve plate 402, thereby connecting the intermediate cavity 102 with the right cavity 103, and further forming a passage inside the valve body 1. By synchronously opening the auxiliary valve plate 402 and the main valve plate 302, the flow efficiency of the medium is ensured.

[0048] When the medium stops flowing, the main valve assembly 3 closes immediately, thus ensuring the check valve effect of the valve body 1, while the sub-valve assembly 4 closes slowly, thereby reducing the impact of water hammer caused by the medium flowing back from the right chamber 103;

[0049] Specifically, first, the main valve assembly 3 will immediately move to the left under the action of the return spring 304 and cooperate with the main fixed plate 301 to cut off the left chamber 101 from the intermediate chamber 102, thus ensuring the check valve effect of the non-return valve; at the same time, since the first push plate 305 and the second push plate 405 are only in contact connection, and the return stroke time of the compression spring 404 is greater than the return stroke time of the return spring 304, the sub-valve plate 402 will gradually and slowly close after the main valve plate 302 closes, thereby reducing the impact of water hammer caused by the medium flowing back from the right chamber 103; during this process, the flowing-back medium will accumulate in the intermediate chamber 102. Before the next medium circulation, the residual medium needs to be cleaned, otherwise it will affect the quality of the next circulated medium.

[0050] When adjusting the check direction of the non-return valve, first stop the medium circulation, and then rotate the adjusting assembly 2 to adjust the positions of the main valve assembly 3 and the sub-valve assembly 4, and clean the residual medium in the intermediate chamber 102;

[0051] Specifically, first, lift the connecting shaft 204 by using the hand ring at the upper end of the connecting shaft 204, so that the insertion rod 205 is separated from the shunt port 501, thereby releasing the fixation of the hand wheel 201; then rotate the hand wheel 201, which will drive the main valve assembly 3 and the sub-valve assembly 4 to rotate together. During this rotation process, the shunt port 501 will communicate with the intermediate chamber 102. At this time, the residual medium in the intermediate chamber 102 will be discharged to the outside through the shunt port 501 from the confluence port 502, thereby cleaning the residual medium during the previous circulation, and thus ensuring the quality of the next medium circulation;

[0052] When the hand wheel 201 is rotated to the appropriate position, press down the connecting shaft 204 to insert the insertion rod 205 into the shunt port 501, which can not only seal the intermediate chamber 102 to prevent the flowing medium from leaking, but also fix the hand ring to prevent it from deviating from its original position during use; if there is a deviation in the position of the hand wheel 201 during the process of adjusting the check direction, this will cause the insertion rod 205 to be unable to accurately block the shunt port 501, so that the flowing medium will drip out from the confluence port 502, enabling the staff to discover the problem in time and make adjustments, thus ensuring the check valve effect of the non-return valve.

[0053] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A check valve with adjustable check direction, comprising a valve body (1), characterized in that: It also includes an adjusting component (2), a main valve component (3), a sub-valve component (4) and a flow discharge component (5). The adjusting component (2) is connected to the valve body (1), the main valve component (3) and the sub-valve component (4) are both connected to the adjusting component (2). The main valve component (3) and the sub-valve component (4) divide the interior of the valve body (1) into three chambers, which are, from left to right, a left chamber (101), an intermediate chamber (102) and a right chamber (103). The flow discharge component (5) is connected to the valve body (1). The medium flow pushes the main valve component (3) to open, and at the same time drives the sub-valve component (4) to open synchronously. After the medium stops flowing, the main valve component (3) closes and the sub-valve component (4) closes slowly. When adjusting the check direction, rotate the adjusting component (2) to drive the main valve component (3) and the sub-valve component (4) to change positions, and at the same time open the flow discharge component (5) to discharge the residual medium in the intermediate chamber (102). After adjusting to the specified position, close the flow discharge component (5) through the adjusting component (2).

2. The check valve with adjustable check direction according to claim 1, wherein: The adjusting component (2) includes a handwheel (201), a rotating shaft (202), a mounting block (203), a connecting shaft (204), a plug rod (205) and a stop block (206). The rotating shaft (202) is connected to the valve body (1), the handwheel (201) is connected to the upper end of the rotating shaft (202), the mounting block (203) is connected to the rotating shaft (202), the connecting shaft (204) is arranged inside the rotating shaft (202), the plug rod (205) is connected to the connecting shaft (204), the lower end of the plug rod (205) is conical, and the stop blocks (206) are connected to the left and right sides of the rotating shaft (202).

3. The check valve with adjustable check direction according to claim 2, characterized in that: The width of the stop block (206) is greater than the diameter value of the plug rod (205), and there is a gap between the bottom of the stop block (206) and the bottom inner wall of the valve body (1).

4. The check valve with adjustable check direction according to claim 1, characterized in that: The intermediate chamber (102) of the valve body (1) is spherical, and the flow discharge component (5) is arranged at the lowest point of the intermediate chamber (102).

5. A check valve with adjustable check direction according to claim 4, characterized in that: The flow discharge component (5) includes a flow splitting port (501) and a flow combining port (502). The flow splitting port (501) and the flow combining port (502) are both opened on the valve body (1). The flow splitting port (501) is communicated with the flow combining port (502) and connects the interior of the valve body (1) with the outside.

6. The check valve with adjustable check direction according to claim 5, characterized in that: The cross-sectional area of the flow combining port (502) is greater than the cross-sectional area of the flow splitting port (501), and the aperture of the flow splitting port (501) is the same as the diameter value of the plug rod (205).

7. A check valve with adjustable check direction according to claim 2, characterized in that: The installation block (203) is internally provided with a main chamber (2031); the main valve assembly (3) includes a main fixing plate (301), a main valve plate (302), a main connecting rod (303) and a return spring (304). The main fixing plate (301) is connected to the rotating shaft (202), the main connecting rod (303) is connected to the installation block (203), the main valve plate (302) is connected to the left end of the main connecting rod (303), and the return spring (304) is arranged inside the main chamber (2031) and its two ends are respectively connected to the main connecting rod (303) and the installation block (203).

8. A check valve with adjustable check direction according to claim 7, characterized in that: The installation block (203) is internally provided with a secondary chamber (2032); the secondary valve assembly (4) includes a secondary fixing plate (401), a secondary valve plate (402), a secondary connecting rod (403) and a compression spring (404). The secondary fixing plate (401) is connected to the rotating shaft (202), the secondary connecting rod (403) is connected to the installation block (203), the secondary valve plate (402) is connected to the right end of the secondary connecting rod (403), the compression spring (404) is sleeved on the secondary connecting rod (403), and its two ends are respectively connected to the installation block (203) and the secondary valve plate (402). The reset travel time of the compression spring (404) is greater than the reset travel time of the return spring (304).

9. The check valve with adjustable check direction according to claim 8, characterized in that: A buffer hole (2033) is formed in the installation block (203), and the buffer hole (2033) communicates the intermediate chamber (102) with the secondary chamber (2032).

10. A check valve with adjustable check direction according to claim 8, characterized in that: A first push plate (305) is connected to the right side of the main valve plate (302), a second push plate (405) is connected to the left side of the secondary valve plate (402), and the end shapes of the first push plate (305) and the second push plate (405) are matched with each other.

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