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 clack, the valve clack is arranged in the valve shell, one end of the valve rod rotatably extends into the valve shell and is matched with the valve clack, a guide cavity is formed in the end, close to the valve clack, of the valve rod, a guide rod in sliding fit with the guide cavity is arranged at the end, close to the valve rod, of the valve clack, and the guide rod makes linear contact with the cavity wall of the guide cavity. By changing surface contact between the guide rod and the cavity wall of the guide cavity into line contact, the contact area between the guide cavity and the guide rod is reduced, and the gap between the guide cavity and the guide rod is increased, so that the lifting resistance of the guide rod in the guide cavity can be reduced, the influence of scaling in the guide cavity on lifting of the guide rod is reduced, and the service life of the guide rod is prolonged. And after scaling in the guide cavity, the guide rod is not easy to be stuck.

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 in a water pipeline network, generally applied to the hard water pipeline network in the north, where the water quality is prone to scale formation. The globe check valve usually includes a valve housing, a valve stem and a valve flap. One end of the valve stem close to the valve flap is provided with a guiding cavity, and one end of the valve flap close to the valve stem is provided with a guiding rod, and the guiding rod is in sliding fit with the guiding cavity.

[0003] In the prior art, the cross sections of the guiding cavity and the guiding rod are usually circular, so the guiding cavity and the guiding rod are in surface contact, and the contact area is large. However, scale is easily formed in the guiding cavity, which easily jams the guiding rod and makes it unable to move, resulting in the valve flap being unable to be normally opened and closed, and thus the function of the globe check valve fails.

[0004] Therefore, there is an urgent need to provide a globe check valve to solve the above problems. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a globe check valve, which can reduce the influence of scale formation in the guiding cavity on the lifting of the guiding rod, so that the guiding rod is not easily jammed after scale is formed in the guiding groove.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The globe check valve includes a valve housing, a valve stem and a valve flap. The valve flap is arranged in the valve housing. One end of the valve stem is rotatably inserted into the valve housing and cooperates with the valve flap. One end of the valve stem close to the valve flap is provided with a guiding cavity, and one end of the valve flap close to the valve stem is provided with a guiding rod that is in sliding fit with the guiding cavity, and the guiding rod and the cavity wall of the guiding cavity are in line contact.

[0008] As an optional solution, the cross section of the guiding cavity is square, and the cross section of the guiding rod is circular.

[0009] As an optional solution, the cross section of the guiding cavity is circular, and the cross section of the guiding rod is square.

[0010] As an optional solution, one end of the valve stem close to the valve flap is connected or abutted with a magnetic part, and a first accommodation groove is arranged on one side surface of the valve flap close to the valve stem, and a first magnetic steel is installed in the first accommodation groove, and the magnetic force of the first magnetic steel and the magnetic part repels each other.

[0011] As an alternative, the magnetic member includes a mounting base and a second magnet. The mounting base is connected to or abuts against the bottom end of the valve stem and is sleeved outside the guide rod. A second accommodation groove is formed in the mounting base, and the second magnet is installed in the second accommodation groove and repels the magnetic force of the first magnet.

[0012] As an alternative, the openings of the first accommodation groove and / or the second accommodation groove are blocked by a buckle plate.

[0013] As an alternative, both the first magnet and the second magnet are annular and are arranged around the guide rod.

[0014] As an alternative, the valve housing includes a valve body and a valve cover. The valve cover is buckled on the valve body to form a valve cavity. The valve body includes a liquid inlet flow channel and a liquid outlet flow channel located on the same straight line. The liquid inlet flow channel has a first communication port communicating with the valve cavity, and the liquid outlet flow channel has a second communication port communicating with the valve cavity. The valve flap is located in the valve cavity and is used to seal the first communication port.

[0015] As an alternative, a sealing washer is further provided between the valve flap and the top end of the first communication port.

[0016] As an alternative, a handwheel is connected to one end of the valve stem extending outside the valve housing.

[0017] Advantages of the present utility model:

[0018] The present utility model provides a stop check valve. By changing the surface contact between the guide rod and the inner wall of the guide cavity to line contact, the contact area between the guide cavity and the guide rod is reduced, and the gap between the guide cavity and the guide rod is increased. Therefore, the resistance of the guide rod to lift in the guide cavity can be reduced, the sensitivity is improved, and the influence of scale formation in the guide cavity on the lifting of the guide rod is reduced, so that the guide rod is not easily stuck after scale formation in the guide cavity. Description of the Drawings

[0019] Figure 1 is a schematic structural view of the stop check valve provided by the present utility model;

[0020] Figure 2 is a longitudinal sectional view of the stop check valve provided by the present utility model;

[0021] Figure 3 is a transverse sectional view of the stop check valve provided by the present utility model Figure 1 ;

[0022] Figure 4 is a transverse sectional view of the stop check valve provided by the present utility model Figure 2 。

[0023] In the figure:

[0024] 10. Valve housing; 11. Valve body; 111. Liquid inlet flow channel; 112. Liquid outlet flow channel; 113. First communication port; 114. Second communication port; 12. Valve cover; 13. Valve cavity;

[0025] 20. Valve stem; 21. Guide cavity;

[0026] 30. Valve flap; 31. Guide rod; 32. First accommodation groove; 33. First magnet; 34. Sealing washer;

[0027] 40. Magnetic part; 41. Mounting seat; 411. Second accommodation groove; 42. Second magnet;

[0028] 50. Clamping plate; 60. Handwheel. Specific embodiments

[0029] 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 the parts related to the present utility model rather than all the structures are shown in the drawings.

[0030] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can 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 situations.

[0031] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the 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 other features between them. Moreover, the first feature being "above", "above and over", and "on the 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", "below and under", and "beneath" 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.

[0032] In the description of this embodiment, the terms "upper", "lower", "right", etc., which represent the orientation or positional relationship, are based on the orientation or positional relationship 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 operated 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.

[0033] 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 flap 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 flow channel 111 and a liquid outlet flow channel 112 that are located on the same straight line. The liquid inlet flow channel 111 has a first communication port 113 that communicates with the valve cavity 13, and the liquid outlet flow channel 112 has a second communication port 114 that communicates with the valve cavity 13. The valve flap 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 flap 30, and the other end extends out of the valve cover 12.

[0034] 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 achieved, thereby driving the valve flap 30 to rise or fall to open or seal the first communication port 113, realizing the flow or cutoff of the medium. As Figure 2 shown, when the valve flap 30 rises to open the first communication port 113, the medium enters the liquid inlet flow channel 111, enters the valve cavity 13 through the first communication port 113, and then enters the liquid outlet flow channel 112 through the second communication port 114 for normal water supply; when the valve flap 30 descends to seal and close the first communication port 113, a cutoff is formed between the liquid inlet flow channel 111 and the liquid outlet flow channel 112, cutting off the supply of the medium.

[0035] Furthermore, as Figure 2 shown, a guiding cavity 21 is provided at one end of the valve stem 20 close to the valve flap 30, and a guiding rod 31 that is slidably matched with the guiding cavity 21 is provided at one end of the valve flap 30 close to the valve stem 20. The guiding rod 31 and the cavity wall of the guiding cavity 21 are in line contact. By changing the surface contact between the guiding rod 31 and the cavity wall of the guiding cavity 21 to line contact, 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 rise and fall 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 rise and fall 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.

[0036] In an alternative embodiment, asFigure 3 As shown, the cross-section of the guiding cavity 21 is square, and the cross-section of the guiding rod 31 is circular. When the guiding rod 31 is inserted into the guiding cavity 21, the guiding rod 31 and the cavity wall of the guiding cavity 21 are in line contact. Compared with the prior art where the cross-sections of both the guiding cavity 21 and the guiding rod 31 are circular, in this embodiment, the square guiding cavity 21 is matched with the circular guiding rod 31, changing the contact between the guiding rod 31 and the cavity wall of the guiding cavity 21 from surface contact to line contact, reducing the contact area between the guiding cavity 21 and the guiding rod 31, increasing the gap between the guiding cavity 21 and the guiding rod 31, thereby reducing the resistance of the guiding rod 31 to rise and fall in the guiding cavity 21, reducing the influence of scale formation in the guiding cavity 21 on the rise and fall of the guiding rod 31, and making it difficult for the guiding rod 31 to be stuck after scale formation in the guiding cavity 21.

[0037] In another alternative embodiment, as Figure 4 shown, the cross-section of the guiding cavity 21 is circular, and the cross-section of the guiding rod 31 is square. When the guiding rod 31 is inserted into the guiding cavity 21, the guiding rod 31 and the cavity wall of the guiding cavity 21 are also in line contact. Compared with the prior art where the cross-sections of both the guiding cavity 21 and the guiding rod 31 are circular, in this embodiment, the circular guiding cavity 21 is matched with the square guiding rod 31, changing the contact between the guiding rod 31 and the cavity wall of the guiding cavity 21 from surface contact to line contact, reducing the contact area between the guiding cavity 21 and the guiding rod 31, increasing the gap between the guiding cavity 21 and the guiding rod 31, thereby reducing the resistance of the guiding rod 31 to rise and fall in the guiding cavity 21, reducing the influence of scale formation in the guiding cavity 21 on the rise and fall of the guiding rod 31, and making it difficult for the guiding rod 31 to be stuck after scale formation in the guiding cavity 21.

[0038] In this embodiment, the valve flap 30 of the stop check valve realizes sealing by means of magnetism. Specifically, as Figure 2As shown, one end of the valve stem 20 close to the valve flap 30 is connected or abutted with a magnetic member 40. A first accommodation groove 32 is provided on one side surface of the valve flap 30 close to the valve stem 20. A first permanent magnet 33 is installed in the first accommodation groove 32, and the magnetic force between the first permanent magnet 33 and the magnetic member 40 is repulsive. When the valve stem 20 is rotated downward, it can drive the magnetic member 40 close to the first permanent magnet 33. Under the thrust of the valve stem 20, the magnetic member 40 is pressed against the valve flap 30, and the valve flap 30 is pressed against the port of the first communication port 113 to realize the closing of the valve. When the valve needs to be opened, the valve stem 20 is rotated upward, so that the magnetic member 40 is away from the first permanent magnet 33. At this time, the valve flap 30 is in a floating state. When the medium is introduced into the liquid inlet channel 111 and the medium pressure is greater than the magnetic repulsive force between the first permanent magnet 33 and the magnetic member 40, the medium pushes the valve flap 30 open, and the guide rod 31 rises along the guide 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. When the medium pressure is less than the magnetic repulsive force between the first permanent magnet 33 and the magnetic member 40, the magnetic repulsive force between the magnetic member 40 and the first permanent magnet 33 presses the valve flap 30 against the port of the first communication port 113.

[0039] Thus, by using the principle of magnetic repulsion, not only can the valve be closed, but also the valve flap 30 can be kept closed within a certain pressure difference to prevent the faucet from dripping and the water meter from idling; in addition, when the medium flows backward, the medium drives the valve flap 30 to move downward to further close the first communication port 113, and the magnetic repulsive force also presses the valve flap 30 against the first communication port 113, thereby preventing the medium from flowing backward, achieving an effective check valve function, preventing the water meter from rotating backward, and further ensuring the accurate measurement of the water meter.

[0040] In an optional embodiment, as Figure 2 shown, the magnetic member 40 includes a mounting seat 41 and a second permanent magnet 42. The mounting seat 41 is connected or abutted to the bottom end of the valve stem 20 and sleeved outside the guide rod 31. A second accommodation groove 411 is formed on the mounting seat 41, and the second permanent magnet 42 is installed in the second accommodation groove 411. The second permanent magnet 42 is magnetically repulsive to the first permanent magnet 33, thereby pressing the valve flap 30 against the first communication port 113. In another optional embodiment, the magnetic member 40 can also be a whole permanent magnet that is magnetically repulsive to the first permanent magnet 33.

[0041] In an optional embodiment, as Figure 2 shown, the openings of the first accommodation groove 32 and the second accommodation groove 411 are both blocked by a buckle plate 50. By providing the buckle plate 50, each permanent magnet can be blocked in the corresponding accommodation groove to prevent the permanent magnet from detaching from the accommodation groove. In addition, all the permanent magnets are completely covered by non-metals and do not directly contact water, preventing rust.

[0042] 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 receiving groove 32 and the second receiving groove 411 are annular. Such an arrangement 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 flap 30. In another alternative embodiment, the first magnet 33 and the second magnet 42 can also be arranged as a plurality of circumferentially spaced and one-to-one corresponding magnets along the guide rod 31.

[0043] In an alternative embodiment, as Figure 2 shown, a sealing gasket 34 is further provided between the top end of the valve flap 30 and the first communication port 113. The sealing gasket 34 is fixed to the lower side of the valve flap 30. The sealing gasket 34 is made of rubber. When the magnetic repulsive force presses the valve flap 30 against the first communication port 113, the valve flap 30 deforms the sealing gasket 34, thereby ensuring the sealing performance at the first communication port 113.

[0044] In an alternative embodiment, as Figure 1 and Figure 2 shown, one end of the valve rod 20 extending out of the valve cover 12 is connected with a handwheel 60. By rotating the handwheel 60, the valve rod 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.

[0045] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating 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 flap (30), wherein the valve flap (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 flap (30), characterized in that: A guide cavity (21) is provided at one end of the valve stem (20) close to the valve flap (30), and a guide rod (31) slidably matched with the guide cavity (21) is provided at one end of the valve flap (30) close to the valve stem (20), and the guide rod (31) is in linear contact with the cavity wall of the guide cavity (21).

2. The stop check valve according to claim 1, characterized in that: The cross section of the guide cavity (21) is square, and the cross section of the guide rod (31) is circular.

3. The stop check valve according to claim 1, characterized in that: The cross section of the guide cavity (21) is circular, and the cross section of the guide rod (31) is square.

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

5. The stop check valve according to claim 4, 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).

6. The stop check valve according to claim 5, 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).

7. The stop check valve according to claim 5, characterized in that: The first magnetic steel (33) and the second magnetic steel (42) are both annular and are arranged around the guide rod (31).

8. The stop check valve according to any one of claims 1 to 7, characterized in that: The valve housing (10) comprises a valve body (11) and a valve cover (12); the valve cover (12) is buckled onto the valve body (11) and forms a valve cavity (13); the valve body (11) comprises 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) connected to the valve cavity (13); the liquid outlet channel (112) has a second communication port (114) connected to the valve cavity (13); the valve flap (30) is located in the valve cavity (13) and is used to seal the first communication port (113).

9. The stop check valve according to claim 8, characterized in that: A sealing gasket (34) is also provided between the valve flap (30) and the top end of the first communication port (113).

10. The stop check valve according to any one of claims 1 to 7, characterized in that: One end of the valve stem (20) extending outside the valve housing (10) is connected to a hand wheel (60).

Images