A drain valve

Abstract

This utility model discloses a drain valve, including a valve core, a valve body, a main sealing ring, and a secondary sealing ring. The valve body has a valve core hole, an inlet, and an outlet, which communicate with the valve core hole. The valve core includes a valve stem and a valve core body, with the valve core body located at the lower end of the valve stem. The valve stem and valve body are movably inserted into each other. The main sealing ring is located at the top of the valve core body, and the valve core hole has a trapezoidal through hole inside. After the main sealing ring moves down, it seals with the inner wall of the trapezoidal through hole. The secondary sealing ring is sleeved at the bottom of the valve core body, and the bottom of the valve core body has a central through hole communicating with the inside of the valve core hole. The bottom of the central through hole has radial micro-holes, the bottom of which extends out of the bottom of the secondary sealing ring. The bottom of the valve body has a drain groove, and the bottom of the drain groove has an inclined guide hole communicating with the outside. The outer surface of the valve core body has at least two right-handed spiral grooves, and the inner wall of the valve body has left-handed guide ribs. The left-handed guide ribs and the right-handed spiral grooves are asymmetrically distributed. This structure improves the sealing effect and also avoids internal scale buildup during long-term use.

Description

Technical Field

[0001] This utility model relates to the technical field of valves, specifically a drain valve. Background Technology

[0002] Currently, there are many types of valves, mainly including ball valves, safety valves, and air valves. Among the existing safety valve categories is the drain valve, primarily used to prevent technical problems caused by excessive water pressure in pipelines. Due to the huge market demand for drain valves, even small improvements can bring significant market benefits. How to simplify and reduce manufacturing costs has always been a research focus for those skilled in the art. Drain valves have many applications, especially in water heater drain pipes.

[0003] However, the current drain valve has the following problems:

[0004] 1. Currently, the water flow channel between the valve core and the valve body adopts a straight-through structure, which is prone to internal scale accumulation and is inconvenient for later cleaning;

[0005] 2. The sealing structure uses a single-layer rubber ring seal, which is prone to aging and leakage after a long period of time, so it needs to be improved. Utility Model Content

[0006] The purpose of this utility model is to provide a drain valve to solve the problems mentioned in the background art, such as poor sealing effect, easy aging and leakage, easy accumulation of dirt inside, and inconvenience for later cleaning.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a drain valve, comprising a valve core and a valve body, wherein the valve body is provided with a valve core hole, an inlet, and an outlet, the inlet and outlet being respectively connected to the valve core hole; the valve core includes a valve stem and a valve core body, the lower end of the valve stem being provided with a valve core body placed within the valve core hole, and an operating pressure plate being provided after the valve stem extends out of the valve body; characterized in that: it further includes a main sealing ring and a secondary sealing ring; the valve stem adopts a threaded rod structure, and the threaded rod is threadedly engaged with the valve body, enabling the valve core body to move up and down after the threaded rod rotates; the main sealing ring is located at the top of the valve core body, and a trapezoidal through hole is provided inside the valve core hole; the main sealing ring, after moving down, seals with the inner wall of the trapezoidal through hole; the secondary sealing ring is sleeved on the bottom of the valve core body; the valve core... The valve core body has a central through hole at its bottom that communicates with the interior of the valve core hole. A radial micro-hole is located at the bottom of the central through hole, extending beyond the bottom of the secondary sealing ring. A drainage chamber communicating with the outlet is located at the bottom of the valve core hole. A drainage groove is located at the bottom of the drainage chamber, and an inclined guide hole communicating with the outside is located at the bottom of the drainage groove. When the valve core body moves down to the closed position, the secondary sealing ring is compressed and deformed, sealing the outlet. Simultaneously, the radial micro-hole communicates with the drainage groove. At least two right-handed spiral grooves are located on the outer surface of the valve core body. The inner wall of the valve core body has the same number of left-handed guide ribs as the right-handed spiral grooves. The left-handed guide ribs and right-handed spiral grooves are asymmetrically distributed. The projected angle between the left-handed guide ribs and the right-handed spiral grooves is 5°-10°. When the valve core body moves down, the right-handed spiral grooves and left-handed guide ribs form an asymmetrical gap channel.

[0008] Preferably, there are three right-handed spiral grooves, with a spiral angle of 15°-25°, a groove depth of 0.5-1.2mm, and a groove width of 2-3mm. The three right-handed spiral grooves are non-uniformly distributed on the circumference of the valve core, and the ratio of the distance between adjacent grooves is 2:1:2, which breaks the symmetry to enhance the eddy current.

[0009] Preferably, the inner side of the secondary sealing ring is provided with two symmetrical pressure balancing holes, and the diameter of the pressure balancing holes is 0.5mm, so as to avoid excessive pressure difference between the inside and outside of the sealing ring, which may lead to deformation and failure.

[0010] Preferably, the main sealing ring is made of fluororubber and has a trapezoidal cross-section.

[0011] Preferably, the secondary sealing ring is a tapered silicone ring, and the elastic modulus of the secondary sealing ring is in the range of 0.5-1.2 MPa.

[0012] Preferably, the axis of the radial micro-orifice is inclined at a 10°-15° angle to the radial direction of the valve core.

[0013] Preferably, the inner wall of the radial micropores is coated with a Teflon coating to reduce scale adhesion; during drainage, the high-speed water flow self-flushes the channels.

[0014] Preferably, 12-24 radial micro-holes are machined at the bottom of the valve core, and the diameter of each radial micro-hole ranges from 0.8 to 1.5 mm, and all radial micro-holes are evenly distributed in a ring at the bottom of the valve core.

[0015] Preferably, the bottom of the valve core hole is provided with a tapered guide surface, and the bottom of the tapered guide surface is connected to the upper end of the water outlet.

[0016] Preferably, the valve stem can also be in the form of a smooth rod, and the valve stem is movably inserted into the valve body. The extended part of the valve stem is fitted with a spring, one end of which abuts against the bottom of the operating pressure plate and the other end of which abuts against the upper end of the valve body.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. The misaligned shear structure of the right-hand spiral groove and the left-hand guide rib in this structure forces the water flow to generate a three-dimensional spiral motion, further improving drainage efficiency;

[0019] 2. Self-cleaning mechanism: The centrifugal force of the vortex throws impurities toward the inner wall of the valve core hole, and they are flushed to the inlet by the high-speed water flow, thus avoiding sedimentation;

[0020] 3. This structure adopts a double seal to further improve the sealing effect and avoid water leakage problems after a long period of time. Attached Figure Description

[0021] Figure 1 This is an internal cross-sectional view of a drain valve in Example 1;

[0022] Figure 2 for Figure 1 Enlarged view of point A;

[0023] Figure 3 This is an internal cross-sectional view of a drain valve in Example 2;

[0024] Figure 4 for Figure 3 Enlarged view of point B;

[0025] Figure 5 This is an internal cross-sectional view of a drain valve in Example 3;

[0026] Figure 6 for Figure 5 Enlarged view of point C;

[0027] Figure 7 This is an internal cross-sectional view of a drain valve in Example 4.

[0028] In the diagram: Valve core 1, valve stem 101, valve core body 102, drain chamber 1021, operating pressure plate 103, central through hole 104, valve body 2, valve core hole 201, inlet 202, outlet 203, main sealing ring 3, secondary sealing ring 4, trapezoidal through hole 5, radial micro-hole 6, drain groove 7, inclined guide hole 8, right-hand spiral groove 9, left-hand guide rib 10, pressure balance hole 11, Teflon coating 12, conical guide surface 13, spring 14. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of the present utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0030] Example 1

[0031] Please see Figures 1-2As shown in this embodiment, a drain valve is disclosed. To achieve the above-mentioned objective, this utility model provides the following technical solution: A drain valve includes a valve core 1, a valve body 2, a main sealing ring 3, and a secondary sealing ring 4. The valve body 2 is provided with a valve core hole 201, an inlet 202, and an outlet 203. The inlet 202 and the outlet 202 are respectively connected to the valve core hole 201. The valve core 1 includes a valve stem 101 and a valve core body 102. The lower end of the valve stem 101 is provided with a valve core body 102 placed in the valve core hole 201, and an operating pressure plate 103 is provided after the valve stem 101 extends out of the valve body 2. The valve stem 101 adopts a threaded rod structure, and the threaded rod is threadedly engaged with the valve body 2. Rotation of the threaded rod allows the valve core 102 to move up and down. In this structure, by using a threaded rod for the valve stem 101, the internal flow channel can be adjusted by rotation. Once rotated to the correct position, the internal flow channel is closed, eliminating the need for continuous manual pressing, thus simplifying user operation. To restore flow later, the threaded rod can be rotated in the opposite direction to move the valve core 102 upwards, thus opening the main internal flow channel. The main sealing ring 3 is located at the top of the valve core 102. The valve core hole 201 has a trapezoidal through hole 5 inside. After the main sealing ring 3 moves down, it seals against the inner wall of the trapezoidal through hole 5. The secondary sealing ring 4 is sleeved on the bottom of the valve core body 102. The bottom of the valve core body 102 has a central through hole 104 communicating with the inside of the valve core hole 201. The bottom of the central through hole 104 has a radial micro-hole 6. The bottom of the radial micro-hole 6 extends out of the bottom of the secondary sealing ring 4. The bottom of the valve core hole 201 has a drain cavity 1021 communicating with the outlet 203. The bottom of the drain cavity 1021 has a drain groove 7. The bottom of the drain groove 7 has a connecting... The inclined guide hole 8 leads to the external flow. When the valve core 102 moves down to the closed position, the secondary sealing ring 4 is compressed and deformed to seal the outlet 203. At the same time, the radial micro-hole 6 connects with the drainage groove 7. The outer surface of the valve core 102 is provided with at least two right-handed spiral grooves 9, and the inner wall of the valve body 2 is provided with the same number of left-handed guide ribs 10 as the right-handed spiral grooves 9. The left-handed guide ribs 10 and the right-handed spiral grooves 9 are asymmetrically distributed, and the included angle between the projections of the left-handed guide ribs 10 and the right-handed spiral grooves 9 is 5°-10°. When the valve core 102 moves down, the right-handed spiral grooves 9 and the left-handed guide ribs 10 form an asymmetrical gap channel. This structure guides the directional discharge of residual water through the radial micro-hole 6 connecting the drainage groove 7 and the inclined guide hole 8.

[0032] Preferably, there are three right-handed spiral grooves 9, with a spiral angle of 15°-25°, a groove depth of 0.5-1.2 mm, and a groove width of 2-3 mm. The three right-handed spiral grooves 9 are non-uniformly distributed on the circumference of the valve core 102, with an adjacent groove spacing ratio of 2:1:2, breaking the symmetry to enhance the vortex and further improve the drainage speed.

[0033] Preferably, the main sealing ring 3 is made of fluororubber, and the cross-section of the main sealing ring 3 is trapezoidal.

[0034] Preferably, the secondary sealing ring 4 is a conical silicone ring, and the elastic modulus of the secondary sealing ring 4 is in the range of 0.5-1.2MPa. The cone angle of the secondary sealing ring 4 is 45°, and the compression is 30%-40%, which realizes secondary sealing in the low-pressure area and triggers the discharge of residual water.

[0035] Preferably, 12-24 radial microholes 6 are machined on the bottom of the valve core 102, and the diameter of each radial microhole 6 ranges from 0.8 to 1.5 mm, and all radial microholes 6 are evenly distributed in a ring on the bottom of the valve core 102.

[0036] Preferably, a tapered guide surface 13 is provided at the bottom of the valve core hole 201, and the bottom of the tapered guide surface 13 is connected to the upper end of the outlet 203. This structure further improves the drainage efficiency by adding a tapered guide surface 13 at the bottom of the valve core hole 201.

[0037] Preferably, the extended portion of the valve stem 101 is fitted with a spring 14, one end of which abuts against the bottom of the operating pressure plate 103 and the other end of which abuts against the upper end of the valve body 2. By fitting the spring 14 over the valve stem 101 exposed in the valve body 2, the entire valve core 1 can be quickly reset when the operating pressure plate 103 is released, facilitating drainage.

[0038] Preferably, the axis of the radial micro-hole 6 is inclined at a 10°-15° angle to the radial direction of the valve core 102.

[0039] In this structure, the specific operation process for closing the main internal water flow channel is as follows:

[0040] Phase 1 (Main Seal Takes Effect):

[0041] By rotating the operating pressure plate 103 by hand, the threaded rod is rotated, causing the valve core 102 to be pressed down until the main sealing ring 3 contacts the inner wall of the trapezoidal through hole 5 inside the valve core hole 201, blocking the main water flow channel and ensuring that the inlet 202 and the outlet 203 are not connected.

[0042] Second stage (secondary seal linkage);

[0043] Then continue to rotate the operating pressure plate 103 to ensure that the valve core 102 continues to move down 3-5mm. The secondary sealing ring 4 is pressed into the drain cavity 1021 at the bottom of the valve core 102 (the side of the drain cavity 1021 is connected to the outlet 203). At this time, the secondary sealing ring 4 is compressed and deformed, and the outer diameter is reduced to fit tightly against the inner wall of the drain cavity 1021, and the outlet 203 is blocked to form a second seal.

[0044] At this time, the radial micro-holes 6 at the bottom of the valve core 102 are aligned with the drainage groove 7, and the residual water in the valve core hole 201 is discharged through the central through hole 104, the radial micro-holes 6, the drainage groove 7, and the inclined guide hole 8.

[0045] In this structure, the opening process of the main internal water flow channel is as follows:

[0046] When the valve core 102 is lifted by rotating the pressure plate 103 in the opposite direction, the threaded rod rotates, causing the valve core 102 to rise. The secondary sealing ring 4 then elastically recovers, the radial micro-hole 6 and the drainage groove 7 are misaligned and closed, and the main sealing ring 3 separates from the trapezoidal through hole 5, exposing the trapezoidal through hole 5. This allows the pressure on the main sealing ring 3 and the secondary sealing ring 4 to be released simultaneously. Water flows normally from the inlet 202 and out from the outlet 203, opening the water flow channel. Simultaneously, the water flows through the asymmetrical gap between the right-hand spiral groove 9 and the left-hand guide rib 10, creating the following effect:

[0047] Vortex generation: The misalignment and shearing of the right-hand spiral groove 9 and the left-hand guide rib 10 force the water flow to generate a three-dimensional spiral motion (axial + tangential velocity components), further improving drainage efficiency;

[0048] Self-cleaning mechanism: The centrifugal force of the vortex throws impurities toward the inner wall of the valve core hole 201, and they are flushed to the inlet 202 by the high-speed water flow, thus avoiding deposition;

[0049] At the same time, as the valve core 102 is pressed down, the right-hand spiral groove 9 and the left-hand guide rib 10 are gradually misaligned until they are completely closed.

[0050] Furthermore, since the diameter of the drain trough 7 is relatively small, during normal drainage, the water flows directly through the outlet 203 under pressure, with only a small portion seeping out from the drain trough 7. However, this structure is only used in the water heater drain pipe to drain the water in the storage water heater when cleaning the water heater. Therefore, this small amount of seepage does not affect normal drainage and has no impact.

[0051] The structure has been experimentally tested and proven to be effective.

[0052] 1. Sealing performance: Under a water pressure of 1.6MPa, the leakage of the double-sealed structure is ≤0.1mL / min (national standard requires ≤0.5mL / min). Therefore, this structure adopts double sealing to further improve the sealing effect and avoid water leakage problems after a long period of time.

[0053] 2. Drainage efficiency: ≥95% of residual water is discharged within 3 seconds after closing, which is 80% higher than that of a single-seal structure.

[0054] 3. Life test: After 5000 opening and closing cycles, the compression permanent deformation rate of the secondary sealing ring (4) is <8% (silicone industry standard ≤15%).

[0055] 4. Simultaneously, this structure adopts an asymmetrical layout: the left-handed guide ribs 10 are distributed left-handedly on the inner wall of the valve body 2, while the right-handed spiral grooves 9 on the valve core 102 are right-handed, forming a reverse shear force (similar to the principle of turbine blades). Experiments have shown that compared with the ordinary straight-through structure, this structure has a +40% increase in eddy current intensity; a +35% increase in shear force; and a +50% increase in water flow disturbance uniformity, further improving drainage efficiency.

[0056] 5. Cleaning efficiency: After 200 hours of continuous operation in water containing silt (particle diameter ≤ 0.5 mm), there is no scale buildup on the inner wall of the valve body (2) (the scale thickness of traditional structures reaches 1.2 mm);

[0057] 6. Flow loss: The pressure drop caused by the spiral flow guide is only 12% of that of the traditional right angle valve (final measured flow loss ≤3%).

[0058] Example 2

[0059] Please see Figure 3 , Figure 4 As shown in this embodiment, a drain valve is preferably provided with two symmetrical pressure balance holes 11 on the inner side of the secondary sealing ring 4, and the diameter of the pressure balance holes 11 is 0.5mm, so as to avoid excessive pressure difference between the inside and outside of the sealing ring, which would lead to deformation and failure.

[0060] Example 3

[0061] Please see Figure 5 , Figure 6 As shown in this embodiment, a drain valve is preferably provided in which the inner wall of the radial micropores 6 is coated with a Teflon coating 12. By coating the radial micropores 6 with a Teflon coating 12, scale adhesion can be reduced; during drainage, the high-speed water flow self-flushes the channel.

[0062] Example 4

[0063] Please see Figure 7 As shown in this embodiment, a drain valve is preferably provided. The valve stem 101 can also be in the form of a smooth rod, and the valve stem 101 is movably inserted into the valve body 2. The extended part of the valve stem 101 is fitted with a spring 14, one end of which abuts against the bottom of the operating pressure plate 103 and the other end of which abuts against the upper end of the valve body 2. The valve body water flow is controlled by a push-to-close mechanism through the above structure. After the operating pressure plate 103 is released, the valve body is reset under the action of the spring 14.

[0064] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A drain valve, comprising a valve core (1) and a valve body (2), wherein the valve body (2) is provided with a valve core hole (201), an inlet (202) and an outlet (203), the inlet (202) and the outlet (202) being respectively connected to the valve core hole (201), the valve core (1) comprising a valve stem (101) and a valve core body (102), wherein the lower end of the valve stem (101) is provided with a valve core body (102) placed in the valve core hole (201), and an operating pressure plate (103) is provided after the valve stem (101) extends out of the valve body (2), characterized in that: It also includes a main sealing ring (3) and a secondary sealing ring (4). The valve stem (101) adopts a threaded rod structure, and the threaded rod is threadedly engaged with the valve body (2), and can drive the valve core (102) to move up and down after the threaded rod rotates. The main sealing ring (3) is set on the top of the valve core (102). A trapezoidal through hole (5) is provided inside the valve core hole (201). After the main sealing ring (3) moves down, it seals with the inner wall of the trapezoidal through hole (5). The secondary sealing ring (4) is sleeved on the bottom of the valve core (102). A central through hole (104) communicating with the inside of the valve core hole (201) is provided inside the bottom of the valve core (102). A radial micro hole (6) is provided at the bottom of the central through hole (104). (6) The bottom of the auxiliary sealing ring (4) extends out. The bottom of the valve core hole (201) is provided with a drainage chamber (1021) that communicates with the outlet (203). The bottom of the drainage chamber (1021) is provided with a drainage groove (7). The bottom of the drainage groove (7) is provided with an inclined guide hole (8) that communicates with the outside. When the valve core body (102) moves down to the closed position, the auxiliary sealing ring (4) is deformed by pressure and closes the outlet (203). At the same time, the radial micro-hole (6) communicates with the drainage groove (7). The outer surface of the valve core body (102) is provided with at least two right-hand spiral grooves (9). The inner wall of the valve body (2) is provided with left-hand guide ribs (10) in the same number as the right-hand spiral grooves (9). The left-hand guide ribs (10) and the right-hand spiral grooves (9) are asymmetrically distributed.

2. A drain valve according to claim 1, characterized in that: There are 3 right-hand spiral grooves (9), and the spiral angle of the right-hand spiral grooves (9) is 15°-25°, the groove depth of the right-hand spiral grooves (9) is 0.5-1.2mm, the groove width of the right-hand spiral grooves (9) is 2-3mm, and the three right-hand spiral grooves (9) are not uniformly distributed on the circumference of the valve core body (102), and the ratio of the distance between adjacent grooves is 2:1:

2.

3. A drain valve according to claim 1 or 2, characterized in that: The inner side of the secondary sealing ring (4) is provided with two symmetrical pressure balance holes (11), and the diameter of the pressure balance holes (11) is 0.5 mm.

4. A drain valve according to claim 1 or 2, characterized in that: The main sealing ring (3) is made of fluororubber and has a trapezoidal cross-section. The secondary sealing ring (4) is made of conical silicone and has an elastic modulus range of 0.5-1.2 MPa.

5. A drain valve according to claim 1 or 2, characterized in that: The axis of the radial micro-hole (6) is inclined at a 10°-15° angle to the radial direction of the valve core (102).

6. A drain valve according to claim 1, characterized in that: The inner wall of the radial micropore (6) is coated with a Teflon coating (12).

7. A drain valve according to claim 1, characterized in that: 12-24 radial micro-holes (6) are machined at the bottom of the valve core (102), and the diameter of each radial micro-hole (6) ranges from 0.8 to 1.5 mm. All radial micro-holes (6) are evenly distributed in a ring at the bottom of the valve core (102).

8. A drain valve according to claim 1 or 2, characterized in that: The bottom of the valve core hole (201) is provided with a conical guide surface (13), and the bottom of the conical guide surface (13) is connected to the upper end of the outlet (203).

9. A drain valve according to claim 1 or 2, characterized in that: The valve stem (101) can also be in the form of a smooth rod, and the valve stem (101) is movably inserted into the valve body (2). The extended part of the valve stem (101) is fitted with a spring (14) with one end abutting against the bottom of the operating pressure plate (103) and the other end abutting against the upper end of the valve body (2).

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