One-way valve

Abstract

The utility model discloses a one-way valve which comprises a valve body provided with an inflow channel, an outflow channel and a valve cavity, and a flow guide inlet and a flow guide outlet are formed in the two ends of the valve cavity. The valve element assembly is arranged in the valve cavity and comprises a valve rod and an elastic piece, the valve rod is slidably connected into the valve cavity, and the elastic piece elastically abuts against the valve rod so as to be used for pushing the valve rod to close the flow guide inlet; a stop part is arranged in the valve cavity, a receding groove is formed in the valve cavity and located in the side, facing the flow guide inlet, of the stop part, and the end face, facing the flow guide inlet, of the stop part and the inner side face, close to the flow guide outlet, of the receding groove are coplanar. The receding groove is formed in the inner wall of the valve cavity so as to avoid the sliding end of the valve rod, chamfers are prevented from being generated at the connecting corner of the stopping part and the inner wall of the valve cavity, the situation that the valve cavity is opened insufficiently due to the chamfers is avoided, meanwhile, due to the arrangement of the receding groove, the valve rod and the valve cavity cannot be blocked, the valve rod can reset smoothly, and the service life of the valve rod is prolonged. And stable and reliable operation of the one-way valve is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of valves, specifically relating to a one-way valve. Background Technology

[0002] One-way valves are widely used as valves to control the flow of fluids (gas or liquid) in pipelines. They typically consist of a valve body, a valve stem, and a resilient element. The valve body has an inflow channel, an outflow channel, and a valve cavity connecting the two. The valve stem is slidably connected within the valve cavity. When fluid flows from the inflow channel to the outflow channel, the fluid compresses the resilient element through the valve stem, opening the valve cavity. When the fluid stops flowing from the inflow channel to the outflow channel, the resilient element pushes the valve stem to close the valve cavity, preventing the fluid from flowing back from the outflow channel to the inflow channel, thus achieving unidirectional fluid flow.

[0003] like Figure 1 As shown, in existing modular gas supply systems, check valves (also known as non-return valves) typically have a stop 200' within the valve body 100' to limit the sliding stroke of the valve stem 300' when the fluid pushes the valve stem to open the valve chamber. However, due to manufacturing limitations, a first chamfer 210' (bevel or rounded corner) inevitably exists at the corner where the stop and the inner wall of the valve chamber meet, and a second chamfer 310' (bevel or rounded corner) inevitably exists on the outer edge of the valve stem that contacts the stop. When the valve stem contacts the stop, there may be mutual interference between the first and second chamfers. On the one hand, this prevents the valve stem from moving into position to abut the stop when opening the valve chamber, resulting in insufficient valve stem opening. On the other hand, when the valve stem closes the valve chamber under the push of the elastic element, it is easy for the valve stem and valve chamber to jam at the chamfer due to inconsistent slopes of the first chamfer 210′ ​​and the second chamfer 310′, or for the first chamfer 210′ ​​being a rounded corner. This can prevent the valve stem from resetting to close the valve chamber, thus causing the check valve to fail. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a one-way valve to solve the problem of chamfer interference between the valve stem and the valve cavity of the one-way valve.

[0005] To solve the above technical problems, the utility model discloses the following technical scheme: a check valve, comprising: a valve body having an inflow channel, an outflow channel and a valve cavity for fluid to pass through, the two ends of the valve cavity are equipped with a guide inlet for communicating the inflow channel and a guide outlet for communicating the outflow channel;Valve core assembly is equipped in the valve cavity, including valve rod and elastic part, the valve rod is connected in the valve cavity for opening and closing the guide inlet and is slid, and the elastic part is elastically pressed against the valve rod for pushing the valve rod to close the guide inlet;The valve cavity is equipped with a stop portion, the stop portion limits the stroke of the valve rod by abutting against one end of the valve rod towards the guide outlet, the inner wall of the valve cavity is equipped with an avoidance slot adjacent to the stop portion, the avoidance slot is located on the side of the stop portion towards the guide inlet, and the end face of the stop portion towards the guide inlet is coplanar with the inner side face of the avoidance slot close to the guide outlet.The technical scheme has the following technical effects:

[0006] Because the corner where the stop portion is connected with the inner wall of the valve cavity inevitably produces a chamfer during production and processing, the chamfer may block the sliding of the valve rod when the valve rod opens the guide inlet, so that the valve rod cannot slide in place and abuts against the stop portion, that is, the valve cavity is not fully opened, reducing the fluid flow in the check valve, or the valve rod may be stuck between the chamfer and the valve rod when the valve rod closes the valve cavity, for example, because the slope of the chamfer is inconsistent with the slope of the chamfer of the end of the valve rod, so that the valve rod cannot reset to close the valve cavity, resulting in failure of the check valve, therefore, the utility model sets the avoidance slot on the inner wall of the valve cavity, sets the avoidance slot adjacent to the stop portion and on the side of the stop portion close to the guide inlet, and sets the inner side face of the avoidance slot close to the guide outlet to be coplanar with the end face of the stop portion towards the guide inlet, so that when the valve rod slides between the guide inlet and the stop portion, the inner wall of the valve cavity can be recessed to itself through the avoidance slot to form avoidance for the end of the sliding valve rod, that is, the corner where the stop portion is connected with the inner wall of the valve cavity can form avoidance for the valve rod through the avoidance slot, eliminating the chamfer produced at the corner where the stop portion is connected with the inner wall of the valve cavity, and further avoiding the chamfer to cause insufficient opening of the valve cavity and reduce the fluid flow in the check valve, at the same time, the setting of the avoidance slot makes the chamfer of the end of the valve rod can be of any slope, and the valve rod and the valve cavity will not be stuck, the valve rod can reset smoothly, ensuring stable and reliable operation of the check valve and avoiding failure of the check valve.

[0007] In the above check valve, the stop portion is a ring-shaped protrusion protruding from the inner wall of the valve cavity, and the avoidance slot is a ring-shaped groove, and the ring-shaped protrusion and the ring-shaped groove are arranged around the central axis of the valve cavity. By setting the stop portion as a ring-shaped protrusion structure, the stop portion can stably position the valve rod end at various positions, and the stress of the stop portion and the valve rod is more uniform, prolonging the service life, and by setting the avoidance slot as a ring-shaped groove structure, the chamfer produced at any position of the corner where the stop portion is connected with the inner wall of the valve cavity is eliminated, and further avoiding the chamfer to affect the sliding of the valve rod, and at the same time, the production and processing difficulty is low, facilitating production and processing.

[0008] In the one-way valve, the stop portion includes a plurality of stop protrusions arranged around the central axis of the valve cavity at intervals, and the avoiding grooves are provided in one-to-one correspondence with the plurality of stop protrusions. By arranging the stop portion as a plurality of stop protrusions arranged around the central axis of the valve cavity at intervals, the stop portion can stabilize the positioning of the valve rod while also allowing fluid to pass through, increasing the flow at the position of the stop portion, reducing the obstruction of the stop portion to the fluid, and making the flow of the fluid smoother. Alternatively, the stop portion includes a plurality of stop protrusions arranged around the central axis of the valve cavity at intervals, and the avoiding grooves are annular grooves arranged around the central axis of the valve cavity. By arranging the avoiding grooves as a discontinuous structure, the chamfer at the corner of the stop protrusion and the inner wall of the valve cavity that affects the sliding of the valve rod can be eliminated, while the influence of the avoiding grooves on the strength of the valve body is also minimized to avoid deformation or damage of the valve body at the position where the avoiding grooves are provided.

[0009] In the one-way valve, the valve body includes a first body provided with an inflow passage, a second body provided with an outflow passage, and a guide cylinder provided with a stop portion at an end portion. The end portions of the first body and the second body are connected to be sleeved on the outside of the guide cylinder, and the inner cavity of the guide cylinder constitutes a valve cavity. The valve rod is slidably connected in the guide cylinder. By arranging the valve body as a structure in which the first body, the second body, and the guide cylinder cooperate, the guide cylinder guides the fluid in the valve cavity and forms a shield at the connection of the first body and the second body, enhancing the sealing performance of the valve cavity and reducing the possibility of leakage of the fluid in the valve cavity through the connection of the first body and the second body, making the transmission of the fluid safer and more reliable.

[0010] In the one-way valve, a sealing ring is provided on the outer periphery of the guide cylinder, and the sealing ring is clamped between the first body and the second body. The sealing ring can be in abutment with the first body and the second body respectively, so that the guide cylinder is firmly fixed in the first body and the second body, preventing the guide cylinder from shaking and ensuring the stable opening and closing of the valve rod to the flow inlet. At the same time, the sealing ring can increase the sealing area between the guide cylinder and the first body and between the guide cylinder and the second body, thereby enhancing the sealing performance of the connection of the first body and the second body, preventing the fluid in the valve cavity from leaking through the gap between the guide cylinder and the inner wall of the valve cavity and the connection of the first body and the second body, and improving the overall sealing performance of the one-way valve.

[0011] In the one-way valve, a sealing step is provided in the first body, and the end portion of the second body extends into the first body and is threadedly connected with the first body, so that the second body and the sealing step jointly clamp the sealing ring. By threadedly connecting the end portions of the first body and the second body, the installation and disassembly of the first body and the second body are more convenient. At the same time, the sealing step increases the sealing area between the sealing ring and the first body, and the part where the first body and the second body are sleeved increases the sealing area between the first body and the second body, thereby enhancing the sealing performance of the connection of the first body and the second body.

[0012] In the one-way valve, a leak detection hole is further arranged on the first body, the leak detection hole penetrates the side wall of the first body in the radial direction of the first body, and is arranged opposite to the outer circumferential side of the sealing ring. A fluid detection device can be arranged at the leak detection hole outside the one-way valve. If the sealing ring and the first body are not completely sealed or the sealing ring and the second body are not completely sealed, the fluid detection device can detect the leakage of the fluid at the leak detection hole in the first time, so that the sealing effect of the sealing ring is ensured.

[0013] In the one-way valve, the guide cylinder comprises a cylinder body provided with the sealing ring and a valve seat provided with the flow guide inlet, the valve seat is arranged at one end of the cylinder body facing the inflow channel and is in sealing abutment with the first body on the circumferential side of the inflow channel, and a mounting gap is formed between the end of the cylinder body away from the valve seat and the inner wall of the second body. The valve seat seals between the end of the guide cylinder and the first body, ensures that the fluid flowing out of the inflow channel can only enter the valve cavity from the flow guide inlet, prevents the fluid from entering the gap between the guide cylinder and the first body, enhances the sealing effect between the guide cylinder and the first body, and the mounting gap can provide a certain mounting allowance for the guide cylinder and the second body, so that the guide cylinder does not block the installation of the second body and the first body, and the sealing between the sealing ring and the second body is not hindered.

[0014] In the one-way valve, the valve seat is provided with an annular protruding rib around the flow guide inlet on the side facing the valve rod, and the annular protruding rib is in sealing abutment with the end of the valve rod when the valve rod closes the flow guide inlet. The annular protruding rib can enhance the sealing between the valve seat and the valve rod, so that the valve rod has better closing effect on the flow guide inlet.

[0015] In the one-way valve, the valve rod comprises a sealing section for opening and closing the flow guide inlet and a sliding section slidingly connected in the valve cavity, the outer diameter of the sealing section is smaller than the inner diameter of the valve cavity to form a first flow channel therebetween, the valve rod is provided with a second flow channel communicating with the outflow channel, and the inlet of the second flow channel is arranged on the sealing section to communicate with the first flow channel. The sliding section can ensure stable sliding of the valve rod in the valve cavity and prevent the valve rod from shaking, the sealing section can stably open and close the flow guide inlet and form the first flow channel with the inner wall of the valve cavity, when the valve rod opens the flow guide inlet, the fluid in the inflow channel flows into the first flow channel through the flow guide inlet, and then flows into the outflow channel through the second flow channel and the flow guide outlet, so that the fluid flows smoothly.

[0016] The characteristics and advantages of the utility model will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] The utility model will be further described below in combination with the drawings and specific embodiments:

[0018] Figure 1Partial sectional view of a one-way valve in the prior art

[0019] Figure 2 Perspective view of the one-way valve in Example 1

[0020] Figure 3 Exploded view of the one-way valve in Example 1

[0021] Figure 4 Schematic view of the one-way valve in Example 1

[0022] Figure 5 Schematic view of the cylinder in Example 1

[0023] Figure 6 Schematic view of the valve stem in Example 1

[0024] Figure 7 Schematic view of the cylinder in Example 2

[0025] Figure 8 Schematic view of the cylinder in Example 3

[0026] Reference signs:

[0027] 100, valve body

[0028] 200, first body; 210, inflow passage; 220, sealing step; 230, leak detection hole

[0029] 300, second body; 310, outflow passage

[0030] 400, guide cylinder; 410, cylinder; 411, avoidance groove; 4111, annular groove; 4112, avoidance surface; 412, stopper; 4121, annular protrusion; 4122, stopper protrusion; 4123, stopper surface; 413, sealing ring; 414, valve cavity; 415, flow guiding outlet; 420, valve seat; 421, flow guiding inlet; 422, annular protrusion; 430, installation gap

[0031] 600, valve stem; 610, sealing section; 611, first flow channel; 620, sliding section; 621, second flow channel; 6211, inlet; 630, support step

[0032] 700, elastic member DETAILED DESCRIPTION

[0033] The utility model provides a check valve, include: the valve body has the inflow channel, the outflow channel and the valve cavity for the fluid to pass, the both ends of valve cavity are equipped with the guide inlet for the intercommunication inflow channel and the guide outlet for the intercommunication outflow channel, the valve core subassembly is equipped in the valve cavity, includes the valve rod and the elastic part, the valve rod is connected in the valve cavity for opening and closing the guide inlet and is slid, the elastic part is elastically pressed the valve rod, is used for pushing the valve rod to close the guide inlet, the valve cavity is equipped with the stop portion, the stop portion is through with the valve rod the end of the direction guide outlet abuts and restricts the stroke of valve rod, the inner wall of valve cavity is equipped with the adjacent stop portion of the avoidance slot, the avoidance slot is located the side of stop portion direction guide inlet, and the end face of stop portion direction guide inlet is with the inner side face of avoidance slot close to the guide outlet is coplanar, the utility model discloses through setting the avoidance slot on the inner wall of valve cavity, sets up the avoidance slot in adjacent with the stop portion and is located the side of stop portion close to guide inlet, and the inner side face of avoidance slot close to the guide outlet is set into with the end face of stop portion direction guide inlet coplanar, so that when the valve rod is slid between the guide inlet and the stop portion, the inner wall of valve cavity can be recessed to its own interior through the avoidance slot, to form the avoidance of the sliding valve rod end, that is, the corner of the stop portion and the inner wall of the valve cavity is connected to the valve rod through the avoidance slot, eliminating the chamfer produced at the corner of the stop portion and the inner wall of the valve cavity, thereby avoiding the chamfer to cause the valve cavity to open insufficiently and reduce the fluid flow in the check valve, at the same time, the setting of the avoidance slot makes the chamfer of the valve rod end can be any slope, the valve rod and the valve cavity will not be stuck, the valve rod can reset smoothly, ensure that the check valve operates stably and reliably, and avoid the check valve failure.

[0034] The technical solutions of the embodiments of the utility model will be explained and described below in combination with the drawings of the embodiments of the utility model. However, the following embodiments are only preferred embodiments of the utility model, not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0035] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0036] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or a recited technical feature to the exclusion of other features. Thus, a feature defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" or "eighth" can implicitly or explicitly include one or more of the other features.

[0037] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or it can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical direction of the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "lower", "lower" and "lower" of the first feature to the second feature include the vertical direction of the first feature below and obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0039] Embodiment one:

[0040] A one-way valve, such as Figures 2 to 6As shown, the valve includes a valve body 100 and a valve core assembly, the valve body 100 is provided with an inflow passage 210, an outflow passage 310 and a valve cavity 414, the valve cavity 414 is provided with a flow guide inlet 421 and a flow guide outlet 415 at two ends, the flow guide inlet 421 is used for connecting the inflow passage 210, the flow guide outlet 415 is used for connecting the outflow passage 310, the valve core assembly is arranged in the valve cavity 414, the valve core assembly includes a valve rod 600 and an elastic member 700, the valve rod 600 is slidingly connected in the valve cavity 414 to open and close the flow guide inlet 421, the elastic member 700 elastically abuts against the valve rod 600 to push the valve rod 600 to close the flow guide inlet 421 under the action of the elastic force. A stop portion 412 is arranged in the valve cavity 414, when the valve rod 600 slides towards the flow guide outlet 415 to open the flow guide inlet 421, the stop portion 412 can abut against one end of the valve rod 600 towards the flow guide outlet 415 to prevent the valve rod 600 from continuing to slide, thereby limiting the stroke of the valve rod 600. An avoiding groove 411 is arranged on the inner wall of the valve cavity 414 slidingly connected with the valve rod 600, the avoiding groove 411 is arranged adjacent to the stop portion 412, the avoiding groove 411 is located on the side of the stop portion 412 towards the flow guide inlet 421, the end face of the stop portion 412 towards the flow guide inlet 421 is defined as a stop face 4123, the inner side face of the avoiding groove 411 close to the flow guide outlet 415 is defined as an avoiding face 4112, the stop face 4123 is coplanar with the avoiding face 4112, that is, the stop face 4123 extends into the avoiding groove 411 along the radial direction of the valve cavity 414 to form the avoiding face 4112.

[0041] The valve rod 600 has a communication position for opening the flow guide inlet 421 and a non-communication position for closing the flow guide inlet 421; when there is no fluid flowing from the inflow passage 210 to the outflow passage 310, at this time the valve rod 600 is in the non-communication position, that is, the valve rod 600 is pushed by the elastic member 700 to close the flow guide inlet 421 of the valve cavity 414, thereby cutting off the communication between the inflow passage 210 and the valve cavity 414, and preventing the fluid in the outflow passage 310 from flowing to the inflow passage 210 through the valve cavity 414; when there is fluid flowing from the inflow passage 210 to the outflow passage 310, the fluid pushes the valve rod 600 to slide along the axial direction of the valve cavity 414 towards the flow guide outlet 415 until the end of the valve rod 600 abuts against the stop portion 412, at this time the valve rod 600 is in the communication position, the flow guide inlet 421 is opened to make the inflow passage 210 and the valve cavity 414 communicate through the flow guide inlet 421, so that the inflow passage 210 communicates with the outflow passage 310 through the valve cavity 414, the flowing direction of the fluid is inflow passage 210, flow guide inlet 421, valve cavity 414, flow guide outlet 415 and outflow passage 310 in sequence; if the fluid flows reversely, the valve rod 600 will slide towards the flow guide inlet 421 under the pushing of the fluid and the elastic member 700 to reset to the non-communication position, thereby preventing the fluid from flowing reversely, and realizing the one-way flow of the fluid in the one-way valve.

[0042] Because the corner where the stop portion 412 is connected with the inner wall of the valve cavity 414 inevitably produces a chamfer during production and processing, the chamfer can block the sliding of the valve rod 600 when the valve rod 600 opens the flow guide inlet 421, so that the valve rod 600 cannot slide in place and abut against the stop portion 412, that is, the valve cavity 414 is insufficiently opened to reduce the fluid flow in the check valve, and the chamfer can also cause the valve rod 600 to be stuck between the valve rod 600 and the valve cavity 414 when the valve rod 600 closes the valve cavity 414, so that the valve rod 600 cannot reset to close the valve cavity 414, resulting in failure of the check valve, therefore, the utility model sets the avoiding groove 411 on the inner wall of the valve cavity 414, sets the avoiding groove 411 adjacent to the stop portion 412 and on the side of the stop portion 412 close to the flow guide inlet 421, and sets the inner side of the avoiding groove 411 close to the flow guide outlet 415 to be coplanar with the end surface of the stop portion 412 facing the flow guide inlet 421, so that when the valve rod 600 slides between the flow guide inlet 421 and the stop portion 412 (that is, the communication position and the stop position), the inner wall of the valve cavity 414 can be recessed to the inside of itself through the avoiding groove 411 to form an avoiding for the end of the sliding valve rod 600, that is, the corner where the stop portion 412 is connected with the inner wall of the valve cavity 414 can form an avoiding for the valve rod 600 through the avoiding groove 411, eliminate the chamfer produced at the corner where the stop portion 412 is connected with the inner wall of the valve cavity 414, and further avoid that the chamfer causes the valve cavity 414 to be insufficiently opened to reduce the fluid flow in the check valve, meanwhile, the setting of the avoiding groove 411 makes the chamfer of the end of the valve rod 600 can be of any slope, the valve rod 600 and the valve cavity 414 will not be stuck, the valve rod 600 can be reset smoothly, the stable and reliable operation of the check valve is ensured, and the failure of the check valve is avoided.

[0043] In the embodiment, as shown in Figure 5 the stop portion 412 is a ring-shaped protrusion 4121 surrounding the central axis of the valve cavity 414, and the avoiding groove 411 is a ring-shaped groove 4111 surrounding the central axis of the valve cavity 414, and the inner side wall of the ring-shaped groove 4111 close to the flow guide outlet 415 is coplanar with the outer side wall of the ring-shaped protrusion 4121 facing the flow guide inlet 421. By setting the stop portion 412 as the structure of the ring-shaped protrusion 4121, the stop portion 412 can stably position each position of the end of the valve rod 600, the stress of the stop portion 412 and the valve rod 600 is more uniform, and the service life is prolonged, by setting the avoiding groove 411 as the structure of the ring-shaped groove 4111, the chamfer produced at any position of the corner where the stop portion 412 is connected with the inner wall of the valve cavity 414 is eliminated, and further the chamfer is avoided to affect the sliding of the valve rod 600, and meanwhile, the production and processing difficulty is low and convenient for production and processing.

[0044] As Figure 3As shown, the valve body 100 in this embodiment includes a first body 200, a second body 300, and a guide cylinder 400. An inflow channel 210 is provided on the first body 200, and an outflow channel 310 is provided on the second body 300. The ends of the first body 200 and the second body 300 are connected to form a cavity. The guide cylinder 400 is disposed in the cavity, and the outer periphery of the guide cylinder 400 is attached to the inner wall of the cavity so that the first body 200 and the second body 300 are sleeved on the outer side of the guide cylinder 400. The inner cavity of the cylindrical guide cylinder 400 forms a valve cavity 414. A stop portion 412 is provided at one end of the guide cylinder 400 near the guide outlet 415. A cylindrical valve stem 600 is slidably connected inside the guide cylinder 400. By configuring the valve body 100 into a structure consisting of a first body 200, a second body 300, and a guide cylinder 400, the guide cylinder 400 guides the fluid within the valve cavity 414 and forms a shield at the connection between the first body 200 and the second body 300, thereby enhancing the sealing performance of the valve cavity 414 and reducing the possibility of fluid leakage through the connection between the first body 200 and the second body 300. This makes fluid transmission safer and more reliable. Of course, it is understood that the above embodiment is only a preferred embodiment. In other embodiments, the valve body may not have a guide cylinder; that is, the valve body may only include a first body and a second body, with the valve stem slidably connected within the valve cavity formed by the first and second bodies, and a stop portion disposed on the inner wall of the second body.

[0045] In this embodiment, the preferred embodiment is as follows: Figure 4 As shown, a sealing ring 413 is provided on the outer periphery of the guide cylinder 400. The sealing ring 413 is arranged around the central axis of the guide cylinder 400. When the first body 200 and the second body 300 are locked, the first body 200 and the second body 300 together clamp the sealing ring 413. The sealing ring 413 can abut against the first body 200 and the second body 300 respectively, so that the guide cylinder 400 is firmly fixed in the first body 200 and the second body 300, preventing the guide cylinder 400 from shaking and ensuring the stable opening and closing of the valve stem 600 to the flow inlet 421. At the same time, the sealing ring 413 can increase the sealing area between the guide cylinder 400 and the first body 200 and between the guide cylinder 400 and the second body 300, thereby enhancing the sealing performance at the connection between the first body 200 and the second body 300, preventing the fluid in the valve cavity 414 from leaking through the gap between the guide cylinder 400 and the inner wall of the valve cavity 414 and the connection between the first body 200 and the second body 300, and improving the overall sealing performance of the one-way valve.

[0046] The first body 200 in the embodiment is sleeved on the outer periphery of the end of the second body 300, the sealing step 220 is arranged on the inner wall of the first body 200, the end of the second body 300 extends into the first body 200 and is threadedly connected with the first body 200, the two sides of the sealing ring 413 abut against the end of the second body 300 and the sealing step 220 respectively, so as to be clamped between the end of the second body 300 and the sealing step 220. By threadedly connecting the ends of the first body 200 and the second body 300, the installation and dismounting between the first body 200 and the second body 300 are more convenient, meanwhile, the sealing step 220 increases the sealing area between the sealing ring 413 and the first body 200, the part of the first body 200 and the second body 300 sleeved with each other increases the sealing area between the first body 200 and the second body 300, and thus the sealing performance of the connection part of the first body 200 and the second body 300 is enhanced. Of course, it can be understood that in another embodiment, the sealing step 220 can also be arranged on the second body 300, that is, the end of the second body 300 is sleeved on the outer periphery of the end of the first body 200, the end of the first body 200 extends into the second body 300 and is threadedly connected with the second body 300, and the two sides of the sealing ring 413 abut against the end of the first body 200 and the sealing step 220 respectively.

[0047] As shown in Figure 4 The leak detection hole 230 is further arranged on the first body 200, the leak detection hole 230 penetrates the side wall of the first body 200 along the radial direction of the first body 200, the leak detection hole 230 is arranged opposite to the outer periphery of the sealing ring 413, and the user can arrange the fluid detection device at the leak detection hole outside the one-way valve. If the sealing ring 413 and the first body 200 or the sealing ring 413 and the second body 300 are not completely sealed, the fluid detection device can detect the leakage of the fluid at the leak detection hole 230 in the first time, the detection is timely, and the sealing effect of the sealing ring 413 is ensured.

[0048] In the embodiment, the guide cylinder 400 comprises a cylinder body 410 and a valve seat 420 arranged separately, the sealing ring 413 is arranged on the outer sidewall of the cylinder body 410, the stopper 412 is arranged at one end of the cylinder body 410 facing the outflow channel 310, the valve seat 420 is arranged at one end of the cylinder body 410 facing the inflow channel 210, the guide inlet 421 is arranged at the center of the valve seat 420, so that the valve seat 420 is a hollow ring, the valve seat 420 is pressed on the inner wall of the first body 200 by the cylinder body 410, the valve seat 420 is arranged around the outlet of the inflow channel 210 to seal the gap between the end of the guide cylinder 400 and the first body 200, to ensure that the fluid flowing out of the inflow channel 210 can only enter the valve cavity 414 from the guide inlet 421, to prevent the fluid from entering the gap between the guide cylinder 400 and the first body 200, to enhance the sealing effect between the guide cylinder 400 and the first body 200, and at the same time, because the cylinder body 410 and the valve seat 420 are arranged separately, the valve seat 420 can be made of a material with better sealing effect, to further enhance the sealing effect between the guide cylinder 400 and the first body 200.

[0049] Preferably, the valve seat 420 is made of fluororubber material, and the other parts of the valve body 100 are made of metal material. The mounting gap 430 is formed between the end of the cylinder body 410 away from the valve seat 420 and the inner wall of the second body 300, the mounting gap 430 can provide a certain mounting allowance for the guide cylinder 400 and the second body 300, to avoid that the guide cylinder 400 is too long to block the installation of the second body 300 and the first body 200, and to avoid that the guide cylinder 400 blocks the sealing between the sealing ring 413 and the second body 300. The annular rib 422 is arranged on the side of the valve seat 420 facing the valve rod 600, the annular rib 422 is arranged around the guide inlet 421, when the valve rod 600 closes the guide inlet 421, the end of the valve rod 600 and the annular rib 422 abut to seal the guide inlet 421, the annular rib 422 can enhance the sealing between the valve seat 420 and the valve rod 600 by pressure deformation, so that the valve rod 600 has better closing effect on the guide inlet 421.

[0050] The valve stem 600 includes an integrally formed sealing section 610 and a sliding section 620. The sealing section 610 is located on the side of the sliding section 620 near the flow inlet 421 for opening and closing the flow inlet 421. The outer diameter of the sliding section 620 is the same as the inner diameter of the valve cavity 414 for sliding connection within the valve cavity 414. The outer diameter of the sealing section 610 is smaller than the inner diameter of the valve cavity 414 to form a first flow channel 611 between the sealing section 610 and the inner wall of the valve cavity 414. A second flow channel 621 is provided on the valve stem 600. The inlet 6211 of the second flow channel 621 is located on the side wall of the sealing section 610 to communicate with the first flow channel 611 and the second flow channel 621. The outlet of the second flow channel 621 is located at the end of the sliding section 620 facing the outflow channel 310 for communication with the outflow channel 310. The sliding section 620 ensures stable sliding of the valve stem 600 within the valve cavity 414, preventing the valve stem 600 from shaking. The sealing section 610 can stably open and close the flow inlet 421 while also forming a first flow channel 611 with the inner wall of the valve cavity 414. When the valve stem 600 opens the flow inlet 421, the fluid flowing into the channel 210 flows into the first flow channel 611 through the flow inlet 421, then through the second flow channel 621 and the flow outlet 415 into the outflow channel 310, ensuring smooth fluid flow. A support step 630 is provided on the inner wall of the second flow channel 621. The elastic element 700 is preferably a spring, with one end of the spring abutting against the support step 630 and the other end abutting against the second body 300. Of course, the end of the spring used to abut against the second body 300 can also directly abut against the stop part 412.

[0051] Example 2:

[0052] like Figure 7 As shown, the difference between this embodiment and Embodiment 1 is that, in this embodiment, the stop portion includes multiple stop protrusions 4122, which are spaced apart around the central axis of the valve cavity 414. The clearance groove is an annular groove 4111, which is also spaced around the central axis of the valve cavity 414. The inner wall of the annular groove 4111 near the flow outlet is coplanar with the outer wall of the stop protrusions 4122 facing the flow inlet. By configuring the stop portion with multiple stop protrusions 4122 spaced apart around the central axis of the valve cavity 414, the stop portion can stably limit the valve stem while allowing fluid to pass through, increasing the flow rate at the location of the stop portion, reducing the obstruction of the fluid by the stop portion, and making the fluid flow smoother.

[0053] Example 3:

[0054] like Figure 8As shown, the difference between the embodiment and the embodiment one is that, in the embodiment, the stop portion comprises a plurality of stop protrusions 4122 which are arranged at intervals around the central axis of the valve cavity 414, and the avoidance groove 411 is also provided with a plurality of avoidance grooves 411, the number of the avoidance grooves 411 is the same as that of the stop protrusions 4122, and the avoidance grooves 411 are arranged one by one corresponding to the stop protrusions 4122.

[0055] By arranging the avoidance groove 411 into a discontinuous structure, the chamfer which influences the sliding of the valve rod at the corner of the inner wall of the valve cavity 414 can be avoided, and at the same time, the influence of the avoidance groove 411 on the strength of the valve body is also minimized, so that the position of the valve body provided with the avoidance groove 411 is not too low in strength and is not deformed or damaged.

[0056] The above is only the preferred embodiment of the present application, the protection scope of the present application is not limited to the above-mentioned embodiments, any technical solution which belongs to the idea of the present application is within the protection scope of the present application. It should be pointed out that, for the ordinary skilled in the art, some improvements and decorations without departing from the principle of the present application are also considered as the protection scope of the present application.

Claims

1. A one-way valve, comprising: a valve body having an inflow passage, an outflow passage and a valve cavity, the valve cavity having a flow guide inlet for communicating with the inflow passage and a flow guide outlet for communicating with the outflow passage; a valve core assembly arranged in the valve cavity, comprising a valve stem and a resilient member, the valve stem being slidably connected in the valve cavity for opening and closing the flow guide inlet, the resilient member elastically abutting against the valve stem for pushing the valve stem to close the flow guide inlet; characterized in that a stopper is arranged in the valve cavity, the stopper limiting the stroke of the valve stem by abutting against one end of the valve stem towards the flow guide outlet, an avoiding groove is arranged on the inner wall of the valve cavity adjacent to the stopper, the avoiding groove is located on the side of the stopper towards the flow guide inlet, and the end face of the stopper towards the flow guide inlet is coplanar with the inner side face of the avoiding groove close to the flow guide outlet.

2. A check valve according to claim 1, characterized in that: The stopper is an annular protrusion protruding from the inner wall of the valve cavity, and the avoiding groove is an annular groove, the annular protrusion and the annular groove are arranged around the central axis of the valve cavity.

3. A check valve according to claim 1, wherein: The stopper comprises a plurality of stopper protrusions arranged around the central axis of the valve cavity at intervals, and the avoiding groove is arranged in plurality, the plurality of avoiding grooves are arranged one-to-one corresponding to the plurality of stopper protrusions; or the stopper comprises a plurality of stopper protrusions arranged around the central axis of the valve cavity at intervals, and the avoiding groove is an annular groove arranged around the central axis of the valve cavity.

4. A check valve according to claim 1, wherein: The valve body comprises a first body provided with the inflow passage, a second body provided with the outflow passage, and a guide cylinder provided with the stopper, the end portions of the first body and the second body are connected to be sleeved on the outside of the guide cylinder, the inner cavity of the guide cylinder constitutes the valve cavity, and the valve stem is slidably connected in the guide cylinder.

5. A check valve according to claim 4, wherein: A sealing ring is arranged on the outer circumferential side of the guide cylinder, and the sealing ring is clamped between the first body and the second body.

6. A check valve according to claim 5, wherein: A sealing step is arranged in the first body, the end portion of the second body extends into the first body and is threadedly connected with the first body, so that the second body and the sealing step jointly clamp the sealing ring.

7. A one-way valve according to claim 5 or 6, characterised in that: A leak detection hole is further arranged on the first body, the leak detection hole penetrates through the side wall of the first body along the radial direction of the first body, and is arranged opposite to the outer circumferential side of the sealing ring.

8. A check valve according to claim 5 wherein: The guide cylinder comprises a cylinder body provided with the sealing ring and a valve seat provided with the flow guide inlet, the valve seat is arranged at one end of the cylinder body towards the inflow passage and sealingly abuts against the first body on the circumferential side of the inflow passage, and an installation gap is formed between the end of the cylinder body away from the valve seat and the inner wall of the second body.

9. A check valve according to claim 8, wherein: An annular protruding rib surrounding the flow guide inlet is arranged on one side of the valve seat towards the valve stem, and the annular protruding rib sealingly abuts against the end portion of the valve stem when the valve stem closes the flow guide inlet.

10. A check valve according to claim 1, characterized in that: The valve stem comprises a sealing section for opening and closing the flow inlet and a sliding section slidingly connected in the valve cavity, the outer diameter of the sealing section is smaller than the inner diameter of the valve cavity to form a first flow channel therebetween, a second flow channel is provided on the valve stem and communicates with the outflow channel, and the inlet of the second flow channel is provided on the sealing section to communicate with the first flow channel.

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