A heating and ventilation one-way valve with prolonged service life

Abstract

The utility model belongs to valve technical field especially relates to a warm and pass one -way valve of life -time promotion, include: joint sleeve, joint sleeve one end is provided with first threaded joint, the other end is provided with second threaded joint, first bush, first bush bottom is provided with first limit edge, first bush top is provided with close -mouthed structure, first bush's close -mouthed structure one end is connected to first threaded joint inboard, and the limit is formed between first limit edge and first threaded joint, second bush, second bush bottom is provided with second limit edge, second bush top is open -ended and is connected to first bush close -mouthed end outside, and second bush's close -mouthed structure one end is connected to second threaded joint inboard, and the limit is formed between second limit edge and second threaded joint, float ball, float ball sets up in second bush, and cooperates with close -mouthed structure.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and in particular relates to a HVAC check valve with improved service life. Background Technology

[0002] HVAC check valves are mainly used in heating systems to prevent backflow of media and ensure stable system pressure. The main function of check valves in HVAC systems is to prevent backflow of water or gas, ensure unidirectional flow of media in heating pipes, and avoid system pressure imbalance or equipment damage caused by backflow.

[0003] Existing HVAC check valves typically use a valve core spring structure. However, the spring structure is prone to fatigue failure under long-term use, which affects the service life of the HVAC check valve. Therefore, we have specially designed an HVAC check valve to improve its service life. Utility Model Content

[0004] The purpose of this utility model is to address the aforementioned technical problems by providing a HVAC check valve with an extended service life, achieving a durable effect.

[0005] In view of this, the present invention provides a heating and ventilation check valve with improved service life, comprising: The connector sleeve has a first threaded connector at one end and a second threaded connector at the other end. The first bushing has a first limiting edge at its bottom and a closing structure at its top. One end of the closing structure of the first bushing is connected to the inside of the first threaded joint, and a limiting is formed between the first limiting edge and the first threaded joint. The second bushing has a second limiting edge at its bottom and an open top that is connected to the outside of the closed end of the first bushing. One end of the closed structure of the second bushing is connected to the inside of the second threaded joint, and a limiting is formed between the second limiting edge and the second threaded joint. The float is located inside the second bushing and mates with the closing structure. The first bushing contains an inlet channel, the second bushing contains an outlet channel, and the constriction structure connects the inlet and outlet channels.

[0006] In the above technical solution, a limiting groove is further provided on a section of the water outlet channel inside the bottom port of the second bushing, and a limiting block is movably provided on the limiting groove; The limiting block divides the cross-section of the water outlet channel and limits the movement of the float.

[0007] In the above technical solution, the limiting block is further made of rubber material.

[0008] In the above technical solution, further, the joint sleeve has a raised structure that tightens inward on a section of the wall surface on which the second bushing covers the outside of the first bushing, and the raised structure is tightly against the second bushing.

[0009] In the above technical solution, further, the flared end of the second bushing has a conical surface corresponding to the wall surface of the protruding structural part.

[0010] Furthermore, the above technical solution also includes: A sealing ring is disposed in the inner gap of the joint sleeve between the first limiting edge and the opening of the second bushing, and is tightly pressed against the inner wall of the first limiting edge by the closing end of the second bushing.

[0011] In the above technical solution, the float further includes: The first shell is a solid shell; The second housing is hollow inside, and a rotating blade is provided on the outer peripheral surface of the second housing; The counterweight is located inside the second housing. When the buoy is suspended in the water, the first shell is located on top of the second shell.

[0012] The beneficial effects of this utility model are as follows: the rigid connection of the double bushing reduces structural looseness, the float-sealing structure replaces the easily fatigued spring component, and the divided flow channel reduces fluid scouring and wear. It solves the life shortcomings of leakage, jamming and fatigue from three key dimensions: structural stability, sealing reliability and component wear resistance, and achieves the product design goal of long life. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of this utility model; Figure 3 This is an exploded view of the float structure of this utility model; Figure 4 This is a schematic diagram of the limiting block and float of this utility model; the markings in the figure are as follows: 1, connector sleeve; 11, first threaded connector; 12, second threaded connector; 3, first bushing; 31, first limiting edge; 32, constriction structure; 33, water inlet channel; 4, second bushing; 41, second limiting edge; 42, flared end; 43, water outlet channel; 5, float; 51, first shell; 52, second shell; 521, rotating vane; 53, counterweight; 7, limiting block; 8, protruding structure; 9, sealing ring. Detailed Implementation

[0014] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0015] Example 1:

[0016] This embodiment provides a heating and ventilation check valve with improved service life, including: The connector sleeve 1 has a first threaded connector 11 at one end and a second threaded connector 12 at the other end. The first bushing 3 has a first limiting edge 31 at its bottom and a closing structure 32 at its top. One end of the closing structure 32 of the first bushing 3 is connected to the inner side of the first threaded joint 11, and a limiting is formed between the first limiting edge 31 and the first threaded joint 11. The second bushing 4 has a second limiting edge 41 at its bottom and an open top that is connected to the outside of the closed end of the first bushing 3. One end of the closed structure 32 of the second bushing 4 is connected to the inside of the second threaded joint 12. The second limiting edge 41 and the second threaded joint 12 form a limiting relationship. Float 5 is set inside the second bushing 4 and cooperates with the closing structure 32; The first bushing 3 is configured with a water inlet channel 33, the second bushing 4 is configured with a water outlet channel 43, and the closing structure 32 connects the water inlet channel 33 and the water outlet channel 43.

[0017] As can be seen from this embodiment, a HVAC check valve with improved service life includes a connector sleeve 1, a first bushing 3, a second bushing 4, and a float 5; The first threaded connector 11 and the second threaded connector 12 enable the connector sleeve 1 to be directly connected to the pipes of the HVAC system (such as water supply pipes and return pipes) via threads. The connection method conforms to the industry standard, which not only makes assembly convenient, but also reduces the risk of interface leakage caused by mismatched connection methods (such as welding and snap-fit ​​connection), and further improves the stability of system operation.

[0018] The first bushing 3 is mechanically limited by the first limiting edge 31 at the bottom and the first threaded connector 11. The second bushing 4 is limited by the second limiting edge 41 at the bottom and the second threaded connector 12. At the same time, the open end of the top of the second bushing 4 is connected to the outside of the closed end of the first bushing 3, forming a nested assembly structure. The first bushing 3, the second bushing 4 and the connector sleeve 1 form a rigid connection, which effectively disperses fluid pressure and vibration impact, avoids deformation of the valve body cavity due to loosening of components during long-term use, and provides a structural basis for the long-term operation of the check valve.

[0019] The constriction structure 32 at the top of the first bushing 3 serves as the switching node for the fluid channel, and cooperates with the float 5 inside the second bushing 4. When the fluid flows from the inlet channel 33 (inside the first bushing 3) to the outlet channel 43 (inside the second bushing 4), the fluid pressure pushes the float 5 away from the constriction structure 32, and the inlet channel 33 and the outlet channel 43 are connected at the constriction structure 32, and the HVAC check valve opens. When the fluid flows in the opposite direction, the float 5 adheres tightly to the constriction structure 32 under the action of reverse pressure, and the inlet channel 33 and the outlet channel 43 are blocked by the float 5 at the constriction structure 32. Furthermore, compared to the traditional valve core spring structure, it reduces the risk of spring fatigue failure, and the sealing surface (the surface of the float 5 and the inner wall of the closing structure 32) fits tightly, resulting in extremely low reverse leakage. This effectively prevents heat loss, pump idling, or equipment damage (such as boiler dry burning) caused by fluid backflow in the HVAC system.

[0020] The core components, such as the first bushing 3, the second bushing 4, and the float 5, are all independently modularly designed. During assembly, they can be fixed by "limiting edge + nested connection" without complicated welding or bonding processes. This not only improves production efficiency but also reduces product performance differences caused by assembly errors. In later maintenance, if the float 5 or bushing is worn, the component can be quickly replaced by disassembling the threaded joint without replacing the entire check valve, thus reducing maintenance costs.

[0021] The rigid connection of the double bushing reduces structural loosening, the float 5-retractable structure 32 replaces the easily fatigued spring components, and the divided flow channel reduces fluid scouring and wear. From the three key dimensions of structural stability, sealing reliability and component wear resistance, the shortcomings of leakage, jamming and fatigue life are solved, and the product design goal of long life is achieved.

[0022] Example 2:

[0023] This embodiment provides a HVAC check valve with improved service life. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0024] A limiting groove is provided on a section of the water outlet channel 43 located inside the bottom port of the second bushing 4, and a limiting block 7 is movably provided on the limiting groove; Among them, the limiting block 7 divides the cross section of the water outlet channel 43 and limits the float 5.

[0025] As can be seen from this embodiment, a limiting groove is provided on the inner side of the bottom port of the second bushing 4. The limiting block 7, which is movably assembled, forms a physical obstruction to the float 5 in the downward direction. When the fluid impacts the float 5, the float 5 moves downward under the impact force. The limiting block 7 can accurately limit the lowest position of the float 5, preventing it from directly detaching from the second bushing 4, and playing a role in limiting protection.

[0026] Example 3:

[0027] This embodiment provides a HVAC check valve with improved service life. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0028] The limiting block 7 is made of rubber material.

[0029] As can be seen from this embodiment, the rubber material has the characteristics of high elasticity and low hardness. Compared with rigid materials such as metal and plastic, when the float 5 moves downward and hits the limiting block 7 under the action of reverse pressure or gravity, the rubber can absorb the impact energy through its own deformation, which greatly weakens the impact force. This avoids the "hard contact" damage (such as scratches or deformation on the surface of the float 5, or breakage of the limiting block 7) that occurs when the traditional rigid limiting block 7 collides with the float 5, and at the same time reduces the noise generated by the impact (especially suitable for the quiet requirements of home heating and ventilation systems).

[0030] In long-term use, it can significantly reduce the wear of the sealing surface of the float 5 caused by repeated impacts, and extend the service life of the float 5.

[0031] Example 4:

[0032] This embodiment provides a HVAC check valve with improved service life. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0033] The connector sleeve 1 is located on a section of the wall surface of the second bushing 4 covering the outside of the first bushing 3, and has a raised structure 8 that tightens inward. The raised structure 8 is tightly against the second bushing 4.

[0034] As can be seen in this embodiment, the connector sleeve 1 has a raised structure 8 on the inner side of the wall section of the second bushing 4 covering the first bushing 3. The raised structure 8 is tightly against the outer side of the second bushing 4 (the raised structure 8 is formed by a hydraulic closing device). Through the mechanical processing method of "tightening the raised structure", the raised structure 8 is directly pressed against the outer wall of the second bushing 4. This design is equivalent to forming a "radial compression fixing point" in the double bushing nesting area, which completely solves the problem that the traditional nesting connection only relies on the fitting of the assembly gap and is prone to loosening due to fluid pressure fluctuations or vibration.

[0035] Especially during the long-term operation of the HVAC system, the repeated impact of fluid on the bushing will cause a slight displacement tendency. The tight resistance of the protruding structure 8 can form a rigid constraint to ensure that the first bushing 3 and the second bushing 4 always remain in a coaxial nested state, avoiding flow channel displacement caused by structural misalignment between the first bushing 3, the second bushing 4, and the joint sleeve 1.

[0036] Example 5:

[0037] This embodiment provides a HVAC check valve with improved service life. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0038] The flared end 42 of the second bushing 4 is set in a conical shape on the wall surface corresponding to the protruding structure 8.

[0039] As can be seen from this embodiment, the wall surface of the second bushing 4 corresponding to the protruding structure 8 is designed as a conical surface (i.e., the wall surface is inclined from the inside to the outside). When the protruding structure 8 of the connector sleeve 1 is tightly pressed against the conical surface, a "wedge-shaped extrusion" effect is formed. The pressure of the protruding structure 8 is decomposed into "radial clamping force" and "axial auxiliary fixing force" along the normal direction of the conical surface. The radial clamping force can further enhance the radial constraint of the protruding structure 8 on the second bushing 4 and avoid the bushing from radial displacement. The axial auxiliary fixing force works in conjunction with the axial limit of the original first and second limiting edges 41 to reduce the tendency of the bushing to move along the fluid direction. Compared with the design of the planar wall surface which can only withstand radial pressure, the conical wall surface upgrades the fixing effect of the protruding structure 8 from "single radial" to "radial + axial" dual constraint, and the overall stability of the double bushing nest is significantly improved.

[0040] Example 6:

[0041] This embodiment provides a HVAC check valve with improved service life. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0042] The sealing ring 9 is disposed in the inner gap of the connector sleeve 1 between the first limiting edge 31 and the opening of the second bushing 4, and is tightly pressed against the inner wall of the first limiting edge 31 by the closing end of the second bushing 4.

[0043] As can be seen from this embodiment, the gap formed by the first limiting edge 31, the open end of the second bushing 4 and the inner side of the connector sleeve 1 is a "composite gap of multiple components" (including radial gap and axial gap), which cannot be completely sealed by the rigid fit of the metal components alone.

[0044] The sealing ring 9 is placed in the gap and can fill the gap in all directions through its own elastic deformation. In the radial direction, the sealing ring 9 fits tightly against the inner wall of the joint sleeve 1 and the outer wall of the second bushing 4. In the axial direction, it is pressed tightly against the inner wall of the first limiting edge 31 by the closing end of the second bushing 4, forming a double sealing effect of "axial compression + radial wrapping", which completely blocks the path of fluid leakage from the gap. Compared with the "metal hard contact gap" without the sealing ring 9, the sealing reliability is qualitatively improved.

[0045] Example 7:

[0046] This embodiment provides a HVAC check valve with improved service life. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0047] Float 5 includes: First housing 51, the first housing 51 is a solid housing; The second housing 52 is hollow inside, and a rotating blade 521 is provided on the outer peripheral surface of the second housing 52. Counterweight 53 is disposed inside the second housing 52; When the float 5 is suspended in the water, the first shell 51 is located on the upper side of the second shell 52.

[0048] As can be seen from this embodiment, the float 5 includes a first shell 51, a second shell 52, and a counterweight 53; The float 5 employs a design that combines a counterweight 53 within the second housing 52 with a solid first housing 51, creating a "bottom-heavy, top-light" weight distribution. The counterweight 53 is concentrated on the lower side of the second housing 52, while the upper housing 51 is a solid structure (with a higher density than the hollow second housing 52). This dual design ensures that the float 5 maintains a fixed posture with the first housing 51 on top and the second housing 52 on the bottom when suspended in water. This orientation prevents the float 5 from flipping or tilting due to water flow impact, ensuring that the top of the float 5 (on the side of the first housing 51) is precisely aligned with the closing structure 32 of the first bushing 3, providing a fundamental guarantee for the reliability of the one-way seal.

[0049] During use, the ball is impacted by the fluid at the constriction structure 32 and then detaches from the constriction structure 32. As the fluid passes through, the vane 521 guides the fluid to flow along the direction of the blade rotation axis. At the same time, since the float 5 has no fixed structure, the float 5 rotates along with it. During the rotation, the fluid at the bottom of the float 5 forms a vortex and adsorbs the float 5, thus allowing the fluid at the constriction structure 32 to flow normally.

[0050] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A HVAC check valve with improved service life, characterized in that it comprises: The connector sleeve (1) is provided with a first threaded connector (11) at one end and a second threaded connector (12) at the other end. The first bushing (3) has a first limiting edge (31) at its bottom and a closing structure (32) at its top. One end of the closing structure (32) of the first bushing (3) is connected to the inside of the first threaded joint (11), and a limiting is formed between the first limiting edge (31) and the first threaded joint (11). The second bushing (4) has a second limiting edge (41) at its bottom and an open top that is connected to the outside of the closed end of the first bushing (3). The closed structure (32) of the second bushing (4) is connected to the inside of the second threaded connector (12). The second limiting edge (41) and the second threaded connector (12) form a limiting relationship. Float (5), the float (5) is disposed in the second bushing (4) and cooperates with the closing structure (32); The first bushing (3) is configured with an inlet channel (33), the second bushing (4) is configured with an outlet channel (43), and the closing structure (32) connects the inlet channel (33) and the outlet channel (43).

2. The HVAC check valve with improved service life according to claim 1, characterized in that, A limiting groove is provided on a section of the water outlet channel (43) located inside the bottom port of the second bushing (4), and a limiting block (7) is movably provided on the limiting groove. The limiting block (7) divides the cross section of the water outlet channel (43) and limits the float (5).

3. A HVAC check valve with improved service life according to claim 2, characterized in that, The limiting block (7) is made of rubber material.

4. A HVAC check valve with improved service life according to claim 1, characterized in that, The connector sleeve (1) is located on a section of the wall surface of the second bushing (4) covering the outside of the first bushing (3), and a raised structure (8) is tightened inward. The raised structure (8) abuts against the second bushing (4).

5. A HVAC check valve with improved service life according to claim 4, characterized in that, The flared end (42) of the second bushing (4) is conical in shape corresponding to the wall surface of the protruding structure (8).

6. A HVAC check valve with improved service life according to claim 1, characterized in that it further... include: The sealing ring (9) is disposed in the inner gap of the connector sleeve (1) between the first limiting edge (31) and the opening of the second bushing (4), and is tightly pressed against the inner wall of the first limiting edge (31) by the closing end of the second bushing (4).

7. A HVAC check valve with extended service life according to claim 1, characterized in that, The buoy (5) includes: The first housing (51) is a solid housing; The second housing (52) is hollow inside, and a rotating blade (521) is provided on the outer peripheral surface of the second housing (52). A counterweight (53) is disposed inside the second housing (52); When the float (5) is suspended in the water, the first shell (51) is located on the upper side of the second shell (52).

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