Stop check valve

Abstract

The utility model belongs to the technical field of valves, and discloses a stop check valve. The stop check valve comprises a valve shell, a valve rod and a valve element, the valve element is arranged in the valve shell, one end of the valve rod rotatably extends into the valve shell and is matched with the valve element, a guide cavity is formed in the end, close to the valve element, of the valve rod, and a guide rod in sliding fit with the guide cavity is arranged at the end, close to the valve rod, of the valve element. According to the stop check valve, a single-guide structure is adopted, the action sensitivity of the valve element is improved, and compared with a traditional double-guide structure, the stop check valve is simple in structure, the coaxiality of the valve element is easier to guarantee, and the production and manufacturing difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a globe check valve. Background Art

[0002] The globe check valve is a three-proof valve applied to the water pipeline network, generally used in the hard water pipeline network in the north. The existing patent with the publication number CN210088078U discloses a magnetic seal valve, which mainly includes a valve body and a valve cover. A valve stem movably connected to the valve cover is arranged in the valve cover. A valve seat is also arranged on the valve body. A valve flap assembly is further arranged on the valve seat. An elastic diaphragm assembly is arranged on the valve flap assembly and is connected to the valve stem movably at the other end. If the movement of the elastic diaphragm assembly is not perpendicular, it will lead to a decrease in the sensitivity of the valve core assembly. Therefore, this magnetic seal valve adopts a double-guide structure to guide the movement of the valve flap assembly, that is, a guide hole is arranged inside the guide rod of the elastic diaphragm assembly, and the valve flap rod of the valve flap assembly moves in the guide hole of the elastic diaphragm assembly. At the same time, a guide hole is also arranged in the valve stem, and the guide rod of the elastic diaphragm assembly moves in the guide hole of the valve stem. The dimensional accuracy requirements of this double-guide structure are relatively high, it is difficult to ensure the coaxiality, and the production and manufacturing are more difficult.

[0003] Therefore, there is an urgent need to provide a globe check valve to solve the above problems. Content of the Utility Model

[0004] The purpose of the utility model is to provide a globe check valve, which adopts a single-guide structure, has a simple structure, is easier to ensure the coaxiality of the valve core, has high action sensitivity, and reduces the production and manufacturing difficulty compared with the traditional double-guide structure.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] The globe check valve includes a valve housing, a valve stem and a valve core. The valve core is arranged inside the valve housing. One end of the valve stem rotatably extends into the valve housing and cooperates with the valve core. A guide cavity is arranged at one end of the valve stem close to the valve core, and a guide rod slidably matched with the guide cavity is arranged at one end of the valve core close to the valve stem.

[0007] As an optional solution, a plurality of guide ribs contacting the cavity wall of the guide cavity are convexly arranged on the circumferential side of the guide rod, or a plurality of guide ribs contacting the circumferential side of the guide rod are convexly arranged on the cavity wall of the guide cavity.

[0008] As an optional solution, the guide ribs are convexly arranged on the circumferential side of the guide rod, and the guide ribs are in line contact with the cavity wall of the guide cavity.

[0009] As an optional solution, the cross section of the guide rib is semicircular arc.

[0010] As an alternative, a plurality of the guiding ribs are arranged at intervals and evenly along the circumferential direction of the guiding rod.

[0011] As an alternative, the cross sections of both the guiding cavity and the guiding rod are circular.

[0012] As an alternative, a magnetic member is connected or abutted to one end of the valve stem close to the valve core. A first accommodation groove is provided on one side surface of the valve core close to the valve stem. A first magnetic steel is installed in the first accommodation groove. The magnetic force between the first magnetic steel and the magnetic member is repulsive.

[0013] As an alternative, the magnetic member includes a mounting seat and a second magnetic steel. The mounting seat is connected or abutted to the bottom end of the valve stem and sleeved outside the guiding rod. A second accommodation groove is formed in the mounting seat. The second magnetic steel is installed in the second accommodation groove and the magnetic force between the second magnetic steel and the first magnetic steel is repulsive.

[0014] As an alternative, a clamping plate is used to block the notch of the first accommodation groove and / or the second accommodation groove.

[0015] As an alternative, a sealing gasket is provided on one side of the valve core away from the valve stem.

[0016] Advantages of the present utility model:

[0017] The present utility model provides a stop check valve. When the valve core moves up and down, the guiding rod on the valve core moves in the guiding cavity of the valve stem, guiding the movement of the valve core, improving the action sensitivity of the valve core. Compared with the double-guiding structure in the prior art, the use of the elastic diaphragm assembly is cancelled. The guiding rod on the valve core is directly guided and matched with the guiding cavity of the valve stem, adopting a single-guiding structure, with a simple structure, easier to ensure the coaxiality of the valve core, and reducing the difficulty of production and manufacturing. Description of the Drawings

[0018] Figure 1 is a schematic structural view of the stop check valve provided by the present utility model;

[0019] Figure 2 is a longitudinal sectional view of the stop check valve provided by the present utility model in the valve-closed state;

[0020] Figure 3 is a transverse sectional view of the cooperation between the guiding rod and the valve stem provided by the present utility model;

[0021] Figure 4 is a longitudinal sectional view of the cooperation between the valve core and the magnetic member provided by the present utility model;

[0022] Figure 5It is a longitudinal sectional view of the globe check valve provided by the present utility model in the open valve state;

[0023] Figure 6 It is a longitudinal sectional view of the globe check valve provided by the present utility model in the anti-backflow state.

[0024] In the figure:

[0025] 10. Valve housing; 11. Valve body; 111. Inlet liquid flow channel; 112. Outlet liquid flow channel; 113. First communication port; 114. Second communication port; 12. Valve cover; 13. Valve cavity;

[0026] 20. Valve stem; 21. Guide cavity;

[0027] 30. Valve core; 31. Guide rod; 311. Guide rib; 32. First accommodation groove; 33. First magnet; 34. Sealing gasket;

[0028] 40. Magnetic part; 41. Mounting seat; 411. Second accommodation groove; 42. Second magnet;

[0029] 50. Buckle plate; 60. Handwheel. Specific embodiments

[0030] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only parts related to the present utility model are shown in the drawings, rather than all the structures.

[0031] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0033] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] As Figure 1 and Figure 2 shown, this embodiment provides a stop check valve, which includes a valve housing 10, a valve stem 20 and a valve core 30. The valve housing 10 includes a valve body 11 and a valve cover 12. The valve cover 12 is fastened on the valve body 11 to form a valve cavity 13. The valve body 11 includes a liquid inlet channel 111 and a liquid outlet channel 112 located on the same straight line. The liquid inlet channel 111 has a first communication port 113 communicating with the valve cavity 13, and the liquid outlet channel 112 has a second communication port 114 communicating with the valve cavity 13. The valve core 30 is located in the valve cavity 13 and is used to open or seal the first communication port 113. One end of the valve stem 20 rotatably extends into the valve cover 12 and cooperates with the valve core 30, and the other end extends out of the valve cover 12.

[0035] Specifically, the valve stem 20 is threadedly connected to the valve cover 12. By rotating the valve stem 20 around the axis in different directions, the lifting of the valve stem 20 can be realized, thereby driving the valve core 30 to rise or fall to open or seal the first communication port 113, and realizing the flow or cut-off of the medium. As Figure 2 shown, when the valve core 30 rises to open the first communication port 113, the medium enters the liquid inlet channel 111, enters the valve cavity 13 through the first communication port 113, and then enters the liquid outlet channel 112 through the second communication port 114 for normal water supply; when the valve core 30 descends to seal and close the first communication port 113, a cut-off is formed between the liquid inlet channel 111 and the liquid outlet channel 112 to cut off the supply of the medium.

[0036] Furthermore, as Figure 2As shown, one end of the valve stem 20 close to the valve core 30 is provided with a guiding cavity 21, and one end of the valve core 30 close to the valve stem 20 is provided with a guiding rod 31 that is slidably engaged with the guiding cavity 21. When the valve core 30 moves up and down, the guiding rod 31 on the valve core 30 moves within the guiding cavity 21 of the valve stem 20, guiding the movement of the valve core 30, improving the movement sensitivity of the valve core 30. And compared with the double-guiding structure in the prior art, the use of the elastic diaphragm assembly is eliminated. The guiding rod 31 on the valve core 30 is directly guided and engaged with the guiding cavity 21 of the valve stem 20, adopting a single-guiding structure. The structure is simple, the coaxiality of the valve core 30 is easier to ensure, and the difficulty of production and manufacturing is reduced.

[0037] In this embodiment, as Figure 3 shown, a plurality of guiding ribs 311 are protruded on the circumferential side of the guiding rod 31 and arranged at intervals along its circumferential direction. The plurality of guiding ribs 311 are in contact with the cavity wall of the guiding cavity 21. By protruding a plurality of guiding ribs 311 on the circumferential side of the guiding rod 31 and contacting the cavity wall of the guiding cavity 21, while playing a guiding role, the contact area between the guiding cavity 21 and the guiding rod 31 is reduced, and the gap between the guiding cavity 21 and the guiding rod 31 is increased. Thus, the resistance of the guiding rod 31 to move up and down in the guiding cavity 21 can be reduced, the sensitivity is improved, and the influence of scale formation in the guiding cavity 21 on the up and down movement of the guiding rod 31 is reduced, making it difficult for the guiding rod 31 to be stuck after scale formation in the guiding cavity 21.

[0038] In another alternative embodiment, a plurality of guiding ribs 311 protruding from the cavity wall of the guiding cavity 21 and contacting the circumferential side of the guiding rod 31 can also achieve the above effects, which will not be elaborated here. In this embodiment, the guiding ribs 311 are provided on the circumferential side of the guiding rod 31 as an example for illustration.

[0039] Furthermore, as Figure 3 shown, the guiding ribs 311 are in line contact with the cavity wall of the guiding cavity 21. With this setting, compared with surface contact, the friction of the guiding ribs 311 moving in the guiding cavity 21 is further reduced, the sensitivity is improved, and the influence of scale formation in the guiding cavity 21 on the up and down movement of the guiding rod 31 is reduced, making it difficult for the guiding rod 31 to be stuck after scale formation in the guiding cavity 21.

[0040] Optionally, as Figure 3 shown, the cross-section of the guiding ribs 311 is semi-circular. In this way, when the guiding rod 31 is inserted into the guiding cavity 21, the guiding ribs 311 and the cavity wall of the guiding cavity 21 are in line contact, effectively reducing the friction of the guiding ribs 311 moving in the guiding cavity 21, making it difficult for the guiding rod 31 to be stuck after scale formation in the guiding cavity 21, and being convenient for processing.

[0041] In this embodiment, as Figure 3As shown, the guiding ribs 311 are provided in four numbers, and the four guiding ribs 311 are spaced and evenly arranged along the circumferential direction of the guiding rod 31. With such an arrangement, it can play a stable and reliable guiding role in the movement of the guiding rod 31, enabling the guiding rod 31 to move smoothly, improving the action sensitivity of the valve core 30, and having a simple structure and being convenient for processing. In other embodiments, the number of the guiding ribs 311 can also be set to three, five or more numbers that are evenly distributed, and can be flexibly set according to actual needs, without specific limitation here.

[0042] As Figure 3 shown, in this embodiment, the cross-sections of the guiding cavity 21 and the guiding rod 31 are both circular. With such an arrangement, the resistance of the guiding rod 31 to rise and fall in the guiding cavity 21 can be reduced, ensuring the smooth movement of the guiding rod 31 in the guiding cavity 21, and having a simple structure and being convenient for processing. In other embodiments, the cross-sections of the guiding cavity 21 and the guiding rod 31 can also be set to a square, a regular pentagon or other regular polygons, as long as it is ensured that the guiding rod 31 can rise and fall in the guiding cavity 21.

[0043] In this embodiment, the valve core 30 of the stop check valve realizes sealing by means of magnetism. Specifically, as Figure 2 shown, one end of the valve stem 20 close to the valve core 30 is connected or abutted with a magnetic member 40, and a first accommodation groove 32 is provided on the surface of the valve core 30 close to the valve stem 20. A first magnet 33 is installed in the first accommodation groove 32, and the magnetic force of the first magnet 33 repels the magnetic member 40.

[0044] As Figure 2 shown, when the valve stem 20 is rotated and lowered, it can drive the magnetic member 40 to approach the first magnet 33. Under the thrust of the valve stem 20, the magnetic member 40 is pressed against the valve core 30, and the valve core 30 is pressed against the port of the first communication port 113 to realize the closing of the valve. As Figure 5 shown, when the valve needs to be opened, the valve stem 20 is rotated and raised, so that the magnetic member 40 is away from the first magnet 33. At this time, the valve core 30 is in a floating state. When a medium is introduced into the liquid inlet channel 111 and the medium pressure is greater than the magnetic repulsion force between the first magnet 33 and the magnetic member 40, the medium will push the valve core 30 open, and the guiding rod 31 will rise along the guiding cavity 21. The medium enters the valve cavity 13 through the first communication port 113, and then enters the liquid outlet channel 112 through the second communication port 114 for normal water supply; as Figure 6 shown, when the medium pressure is less than the magnetic repulsion force between the first magnet 33 and the magnetic member 40, the magnetic repulsion force between the magnetic member 40 and the first magnet 33 presses the valve core 30 against the port of the first communication port 113 to realize sealing and prevent dripping.

[0045] Thus, by using the principle of magnetic repulsion, not only can the valve be closed, but also the valve core 30 can be kept closed within a certain pressure difference to prevent water leakage from the faucet and prevent the water meter from idling; in addition, as Figure 6 shown, when the medium flows backward, the return water pressure is greater than the inlet water pressure. Under the action of the reverse pressure and the magnetic repulsive force, the valve core 30 is pressed downward against the first communication port 113 to close the valve, prevent backflow and leakage, achieve an effective check valve function, prevent the water meter from rotating backward, and further ensure the accurate measurement of the water meter.

[0046] In an alternative embodiment, as Figure 4 shown, the magnetic member 40 includes a mounting seat 41 and a second magnet 42. The mounting seat 41 is connected to or abuts against the bottom end of the valve stem 20 and is sleeved outside the guide rod 31. The mounting seat 41 can slide up and down along the guide rod 31. A second accommodation groove 411 is formed in the mounting seat 41, and the second magnet 42 is installed in the second accommodation groove 411. The second magnet 42 repels the first magnet 33 magnetically, thereby pressing the valve core 30 against the first communication port 113. In another alternative embodiment, the magnetic member 40 can also be a whole magnet that magnetically repels the first magnet 33.

[0047] In an alternative embodiment, as Figure 4 shown, the openings of the first accommodation groove 32 and the second accommodation groove 411 are both sealed with a buckle plate 50. By providing the buckle plate 50, each magnet can be sealed in the corresponding accommodation groove to prevent the magnet from detaching from the accommodation groove. In addition, all the magnets are completely covered by non-metals and do not come into direct contact with water, preventing rust.

[0048] In an alternative embodiment, both the first magnet 33 and the second magnet 42 are annular and are arranged around the guide rod 31. Correspondingly, both the first accommodation groove 32 and the second accommodation groove 411 are annular. Such a setting makes the areas of the first magnet 33 and the second magnet 42 large enough to ensure the magnetic repulsive force between the first magnet 33 and the second magnet 42, thereby ensuring the sealing reliability of the valve core 30. In another alternative embodiment, the first magnet 33 and the second magnet 42 can also be arranged at intervals along the circumferential direction of the guide rod 31 and are in one-to-one correspondence.

[0049] In an alternative embodiment, as Figure 2 and Figure 4 shown, a sealing gasket 34 is provided on the side of the valve core 30 away from the valve stem 20. The sealing gasket 34 is made of rubber. When the valve core 30 is pressed against the first communication port 113, the valve core 30 deforms the sealing gasket 34 by extrusion, thereby ensuring the sealing performance of the first communication port 113.

[0050] In an alternative embodiment, as Figure 1 and Figure 2As shown, a hand wheel 60 is connected to one end of the valve stem 20 extending outside the valve cover 12. By rotating the hand wheel 60, the valve stem 20 can be driven to rotate, which is convenient for the operator to apply force, is convenient and fast to operate, and reduces the use of tools.

[0051] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A stop check valve, comprising a valve housing (10), a valve stem (20) and a valve core (30), wherein the valve core (30) is arranged in the valve housing (10), one end of the valve stem (20) is rotatably extended into the valve housing (10) and cooperates with the valve core (30), characterized in that: A guide cavity (21) is provided at one end of the valve stem (20) close to the valve core (30), and a guide rod (31) slidably matched with the guide cavity (21) is provided at one end of the valve core (30) close to the valve stem (20).

2. The stop check valve according to claim 1, characterized in that: A plurality of guide ribs (311) in contact with the cavity wall of the guide cavity (21) are convexly provided on the circumferential side of the guide rod (31), or a plurality of guide ribs (311) in contact with the circumferential side of the guide rod (31) are convexly provided on the cavity wall of the guide cavity (21).

3. The stop check valve according to claim 2, characterized in that: The guide rib (311) is protrudingly arranged on the circumferential side of the guide rod (31), and the guide rib (311) is in linear contact with the cavity wall of the guide cavity (21).

4. The stop check valve according to claim 3, characterized in that: The cross section of the guide rib (311) is semicircular.

5. The stop check valve according to claim 3, characterized in that: The plurality of guide ribs (311) are spaced and evenly arranged along the circumference of the guide rod (31).

6. The stop check valve according to any one of claims 1 to 5, characterized in that: The cross sections of the guide cavity (21) and the guide rod (31) are both circular.

7. The stop check valve according to any one of claims 1 to 5, characterized in that: One end of the valve stem (20) close to the valve core (30) is connected to or abuts against a magnetic member (40), and a first accommodating groove (32) is provided on a side surface of the valve core (30) close to the valve stem (20), and a first magnetic steel (33) is installed in the first accommodating groove (32), and the magnetic forces of the first magnetic steel (33) and the magnetic member (40) repel each other.

8. The stop check valve according to claim 7, characterized in that: The magnetic member (40) comprises a mounting seat (41) and a second magnetic steel (42); the mounting seat (41) is connected to or abuts against the bottom end of the valve stem (20) and is sleeved outside the guide rod (31); a second accommodating groove (411) is provided on the mounting seat (41); the second magnetic steel (42) is installed in the second accommodating groove (411) and repels the magnetic force of the first magnetic steel (33).

9. The stop check valve according to claim 8, characterized in that: The notch openings of the first accommodating groove (32) and / or the second accommodating groove (411) are blocked with a buckle plate (50).

10. The stop check valve according to any one of claims 1 to 5, characterized in that: A sealing gasket (34) is provided on a side of the valve core (30) away from the valve stem (20).

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