Leak-proof double-check-valve structure

Abstract

The invention relates to the technical field of water meter equipment, in particular to a leakage-proof double-check-valve structure which comprises an upper shell and two check valves which are connected in series and are the same in structure, and core components of the check valves comprise check valve shells, tension springs, check valve covers, silica gel flat washers and sealing O-shaped rings. The rocker arm type structure is matched with the design of the tension spring and matched with the concave chute, so that the movement range of the check valve clack is larger, the opening degree is remarkably improved during forward flow, the flow area is increased, the fluid resistance is reduced, the pressure drop loss is reduced, the check valve clack can be rapidly pulled back through the tension spring during reverse flow, a flow path is cut off, the water hammer phenomenon can be effectively prevented, and meanwhile, the water hammer phenomenon is effectively prevented. The opening and closing stroke of the valve clack of the check valve can be shorter through the angle fitting matching design of the inclined faces, flow guide or check can be rapidly achieved, the elastic fitting of the silica gel plane and the inclined faces is combined, microscopic gaps are effectively filled, efficient sealing under high pressure is achieved, opening and closing are flexible, and meanwhile pressure drop is smaller.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of water meter equipment, and in particular to a double check valve structure capable of preventing leakage. BACKGROUND

[0002] In a water supply system, a water meter often idles due to reasons such as pipeline pressure fluctuation, water flow backflow or air mixing, which leads to metering deviation, resource waste and billing disputes. In the field of water meters and fluid control, a check valve is a key component for preventing medium backflow.

[0003] In the prior art, a single check valve structure is often used to prevent backflow, but in actual use, there are problems such as poor sealing, easy leakage, slow opening and closing response, obvious water hammer effect, and the like. In addition, the check valve disc of a traditional check valve is usually spring-pressed, and the sealing surface between the check valve disc and the valve body is in rigid contact, which is prone to leakage due to manufacturing tolerances or impurities, especially under low pressure or backflow conditions. The risk of sealing failure is high. Although there are double check valve structures in the prior art, most of them have complex structures, cumbersome assembly processes and high costs, and the sealing performance is unstable under high-frequency opening and closing or different installation directions, so it is difficult to achieve efficient leakage prevention.

[0004] Therefore, there is an urgent need for a double check valve structure that is simple in structure, reliable in sealing and flexible in opening and closing. SUMMARY

[0005] The application provides a double check valve structure capable of preventing leakage, which solves the problems of poor sealing, easy leakage, slow opening and closing response and obvious water hammer effect in the traditional check valve structure in the prior art.

[0006] The application provides a double check valve structure capable of preventing leakage, which solves the problems of poor sealing, easy leakage, slow opening and closing response and obvious water hammer effect in the traditional check valve structure in the prior art. The double check valve structure comprises two check valves arranged in series and an upper housing for accommodating the two check valves. The check valve is composed of a check valve shell, a tension spring, a check valve cover, a silica gel flat gasket and a sealing O-ring. A first small groove is formed in the check valve shell, and a slope, a rocker seat, an elastic slope and a sealing ring groove are further arranged in the first small groove. The check valve cover is provided with an adhesive surface, and the silica gel flat gasket is adhered to the adhesive surface of the check valve cover by a rubber adhesive to form a check valve disc. The sealing O-ring is nested in the sealing ring groove of the check valve shell.

[0007] Preferably, the check valve disc is further provided with a silica gel flat surface, a second small groove, a rocker shaft and a concave slope groove, and the check valve disc is rotatably installed in the rocker seat through the rocker shaft.

[0008] Preferably, the silica gel flat surface is tightly attached to the slope in the closed state.

[0009] Preferably, the silicone plane of the check valve disc is in surface contact with the inclined plane of the check valve shell, and the inclined angle at the contact surface is 30-60 degrees.

[0010] Preferably, one end of the tension spring is fixed in the second small groove, and the other end is fixed in the first small groove.

[0011] Preferably, the depth of the inclined groove is 1.2-1.5 times the diameter of the tension spring, and the width is 1.1-1.3 times the diameter of the tension spring.

[0012] Preferably, the cross section of the sealing o-ring is circular or elliptical, and the outer surface of the sealing o-ring is tightly fitted with the inner wall of the upper shell.

[0013] Preferably, the upper shell is provided with an inner plane and a notch groove for fixing the check valve, and two check valves are axially installed in the interior of the upper shell.

[0014] Preferably, the bottom plane of one of the check valves is fitted with the inner plane, and the elastic inclined sheet of the other check valve is detachably embedded in the notch groove.

[0015] Preferably, the two rocker arm seats are provided with inclined guide sliding grooves, and the outer surface of the rocker arm shaft is rotatably arranged in the interior of the guide sliding groove, thereby connecting the check valve disc with the rocker arm seat.

[0016] The beneficial effects of the present application are as follows: The anti-leakage double check valve structure of the present application is designed by combining the rocker arm structure with the tension spring, and is matched with the inclined groove, so that the movement range of the check valve disc is larger, the opening degree is significantly improved during forward flow, the flow area is increased, the fluid resistance is reduced, the pressure drop loss is reduced, the check valve disc can be quickly pulled back by the tension spring during reverse flow, the flow path is cut off, and the water hammer phenomenon and reverse flow can be effectively prevented. At the same time, the opening and closing stroke of the check valve disc is shorter through the angle fitting design of the inclined surface, and the diversion or check is quickly realized. Combined with the elastic fitting of the silicone plane and the inclined surface, the micro gap is effectively filled, high-efficiency sealing under high pressure is realized, the opening and closing are flexible, and the pressure drop is smaller. Further, the double valve structure formed by connecting the double check valves in series can still provide protection even if a single check valve disc fails, thereby providing double protection for the water meter against reverse flow, reducing the risk of water meter idling and measurement error. Especially, the modular assembly design simplifies the assembly process, makes the structure simple and easy to assemble, reduces the manufacturing cost, and improves the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0018] Figure 1 The overall structure schematic diagram of the anti-leakage double check valve structure provided in the embodiments of the present application is shown in the figure. Figure 2 The overall structure explosion diagram of the double check valve structure in the present application is shown in the figure. Figure 3 The closed / opened state section view diagram of the double check valve structure in the present application is shown in the figure. Figure 4 The overall structure schematic diagram of the single check valve in the present application is shown in the figure. Figure 5 The overall structure explosion diagram of the single check valve in the present application is shown in the figure. Figure 6 The installation structure schematic diagram of the inclined surface in the check valve shell in the present application is shown in the figure. Figure 7 The installation structure schematic diagram of the rocker arm seat in the check valve shell in the present application is shown in the figure. Figure 8 The back surface structure schematic diagram of the check valve cover in the present application is shown in the figure. Figure 9 The overall structure schematic diagram of the check valve disc in the present application is shown in the figure. Figure 10 The overall structure schematic diagram of the upper shell in the present application is shown in the figure.

[0019] Reference signs: 1, check valve; 2, upper shell; 3, guide chute; 4, check valve disc; 1.1, check valve shell; 1.1.1, first small groove; 1.1.2, inclined surface; 1.1.3, rocker arm seat; 1.1.4, elastic inclined plate; 1.1.5, sealing ring groove; 1.2, tension spring; 1.3, check valve cover; 1.3.1, bonding surface; 1.4, silica gel flat washer; 4.1, silica gel flat surface; 4.2, second small groove; 4.3, rocker arm shaft; 4.4, concave inclined groove; 1.5, sealing o-ring. Specific embodiments

[0020] The technical solutions of the present application will be described below in conjunction with the embodiments, obviously, the described embodiments are some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0021] The anti-leakage double check valve structure provided by the embodiments of the present application is described below. Figures 1-10

[0022] Referring to FIG. 1, Figures 1-7 The anti-leakage double check valve structure provided by the embodiments of the present application mainly consists of an upper shell 2 and two check valves 1 which are arranged in series and have the same structure. The core components of the check valve 1 include a check valve housing 1.1, a tension spring 1.2, a check valve cover 1.3, a silica gel flat gasket 1.4, and a sealing O-ring 1.5. The check valve housing 1.1 is provided with a first small groove 1.1.1, and further provided with an inclined surface 1.1.2, a rocker seat 1.1.3, an elastic inclined plate 1.1.4, and a sealing ring groove 1.1.5. The check valve housing 1.1 is preferably made of high-strength engineering plastic, such as PP or nylon, and is integrally injection molded, so as to ensure the structural strength and the accuracy of each feature. The inclined surface 1.1.2 is arranged at the bottom of the inner wall of the check valve housing 1.1. The included angle between the inclined surface and the bottom surface of the check valve housing 1.1 is greater than or equal to 30° and less than or equal to 60°, and is preferably 45°. This angle design ensures that the check valve disc 4 can form an effective surface seal when closed, and shortens the opening and closing stroke. The rocker seat 1.1.3 has two, and the two rocker seats 1.1.3 are symmetrically arranged at one end of the inner wall of the check valve housing 1.1 away from the inclined side of the inclined surface. Each rocker seat 1.1.3 is provided with an inclined guide slot 3, which provides a sliding and rotating track for the rocker shaft 4.3. The elastic inclined plate 1.1.4 is provided with multiple, and the multiple elastic inclined plates 1.1.4 are arranged at the outer periphery of the upper surface of the check valve housing 1.1. The sealing ring groove 1.1.5 is arranged on the outer surface of the check valve housing 1.1 near the bottom side, and is used to install the sealing O-ring 1.5. The elastic inclined plate 1.1.4 can cooperate with the notch groove 2.2 of the upper shell 2 to position and clamp the axial direction of the check valve 1 to be installed. The elastic inclined plate 1.1.4 of the check valve housing 1.1 is an integral structure, and the free end of the elastic inclined plate 1.1.4 is provided with an arc-shaped chamfer to avoid jamming when assembled with the notch groove 2.3 of the upper shell 2. The check valve cover 1.3 is provided with an adhesive surface 1.3.1, and the silica gel flat gasket 1.4 is bonded to the adhesive surface 1.3.1 of the check valve cover 1.3 by rubber adhesive to form the check valve disc 4. The sealing O-ring 1.5 is nested in the sealing ring groove 1.1.5 of the check valve housing 1.1, and is used to seal with the inner wall of the upper shell.

[0023] ​By the cooperation of the rocker arm structure and the tension spring design, the concave inclined groove is matched, the movable range of the check valve disc is larger, the opening degree is significantly improved when the flow is normal, the flow area is increased, the fluid resistance is reduced, the pressure drop loss is reduced, the check valve disc can be quickly pulled back by the tension spring when the flow is reversed, the flow path is cut off, the water hammer phenomenon can be effectively prevented, the backflow can be prevented, at the same time, the opening and closing stroke of the check valve disc can be shorter through the angle of the inclined surface, the flow guiding or check can be quickly realized, the elastic fitting of the silica gel plane and the inclined surface is combined, the micro gap is effectively filled, the high-efficiency sealing under high pressure is realized, the opening and closing are flexible, and the pressure drop is smaller.

[0024] Please continue to refer to Figure 8 and Figure 9 as shown in Figure 8 and Figure 9 , wherein Figure 8 is a back surface structure diagram of the check valve cover in the application, Figure 9 is a whole structure diagram of the check valve disc in the application. In some embodiments, the check valve disc 4 is further provided with a silica gel plane 4.1, a second small groove 4.2, a rocker arm shaft 4.3 and a concave inclined groove 4.4, and the check valve disc 4 is rotatably installed in the rocker arm seat 1.1.3 through the rocker arm shaft 4.3.

[0025] Specifically, the check valve disc 4 is provided with the silica gel plane 4.1 matched with the inclined surface 1.1.2 of the check valve shell 1.1, the small groove 4.2 for fixing one end of the tension spring 1.2, the rocker arm shaft 4.3 matched with the rocker arm seat 1.1.3, and the concave inclined groove 4.4 for accommodating the tension spring 1.2.

[0026] In some embodiments, the silica gel plane 4.1 is closely fitted with the inclined surface 1.1.2 in the closed state, and the bonding surface 1.3.1 of the check valve cover 1.3 is provided with an annular positioning groove, the edge of the silica gel gasket 1.4 is embedded in the annular positioning groove, so as to realize the pre-positioning of the silica gel gasket 1.4 and avoid the deviation during bonding.

[0027] Specifically, before bonding, the edge of the silica gel gasket 1.4 can be first embedded in the above-mentioned annular positioning groove for pre-positioning, and then it is fully bonded with the bonding surface 1.3.1 of the valve cover 1.3 by using a special rubber adhesive, and after applying appropriate pressure for curing, a complete check valve disc 4 is formed, which effectively avoids the deviation problem in the bonding process.

[0028] In some embodiments, the silica gel plane 4.1 of the check valve disc 4 and the inclined surface 1.1.2 of the check valve shell 1.1 are in surface contact fitting, and the inclination angle at the fitting surface is thirty to sixty degrees, so as to shorten the opening and closing angle stroke of the check valve disc.

[0029] In some embodiments, one end of the tension spring 1.2 is fixed in the second small groove 4.2, and the other end is fixed in the first small groove 1.1.1. The tension spring 1.2 is made of high elastic coefficient alloy material to provide stable rebound force in the stretched state. The inner wall of the first small groove 1.1.1 in the check valve shell 1.1 and the second small groove 4.2 in the check valve disc 4 can also be provided with anti-skid lines. The hook end of the tension spring 1.2 is clamped with the anti-skid lines to prevent the tension spring 1.2 from falling off after long-term use.

[0030] In some embodiments, the depth of the recessed inclined groove 4.4 is 1.2-1.5 times the diameter of the tension spring 1.2, and the width is 1.1-1.3 times the diameter of the tension spring 1.2, so that the tension spring 1.2 can be completely accommodated in the recessed inclined groove 4.4 when the check valve disc is opened, without affecting the opening degree of the check valve disc.

[0031] In some embodiments, the cross section of the sealing o-ring 1.5 is circular or elliptical. The outer surface of the sealing o-ring 1.5 is tightly fitted with the inner wall of the upper shell 2 to enhance the sealing effect and prevent liquid leakage. The sealing o-ring 1.5 is sealed with the inner wall of the upper shell 2 through elastic deformation.

[0032] Please continue to refer to Figure 10 As Figure 10 shown, it is the overall structure schematic diagram of the upper shell in the present application; In some embodiments, the inner plane 2.1 and the notch groove 2.2 are provided in the upper shell 2 for fixing the check valve 1. Two check valves 1 are respectively axially installed in the interior of the upper shell 2.

[0033] In some embodiments, the bottom plane of one check valve 1 is fitted with the inner plane 2.2, and the elastic inclined plate 1.1.4 of the other check valve 1 is detachably embedded in the notch groove 2.1.

[0034] In some embodiments, the inclined guide sliding groove 3 is provided on each of the two rocker arm seats 1.1.3. The outer surface of the rocker arm shaft 4.3 is rotatably arranged in the interior of the guide sliding groove 3, thereby connecting the check valve disc 4 and the rocker arm seat 1.1.3.

[0035] The overall assembly steps are as follows: First, the sealing o-ring 1.5 is installed in the sealing ring groove 1.1.5 of the first check valve shell 1.1. Then, one end of the tension spring 1.2 is hooked into the second small groove 4.2 of the check valve disc 4. The silica gel plane 4.1 of the check valve disc 4 is directed towards the direction of the inclined surface 1.1.2 of the check valve shell 1.1. The rocker arm shafts 4.3 on both sides are pushed into the guide sliding grooves 3 of the rocker arm seats 1.1.3 of the check valve shell 1.1. Subsequently, the other end of the tension spring 1.2 is hung into the first small groove 1.1.1 of the check valve shell 1.1, at this time, under the tension provided by the tension spring 1.2, the silica gel plane 4.1 of the check valve disc 4 can be naturally and closely fitted with the inclined surface 1.1.2.

[0036] Repeat the above steps to assemble the second check valve 1.

[0037] One of the assembled check valves 1 is installed into the upper shell 2, with its bottom flatly attached to the inner plane 2.1 of the upper shell, and the other check valve 1 is installed into the upper shell 2 in series, and is gently pressed to deform the elastic inclined plate 1.1.4 and slide into the notch groove 2.2 of the upper shell, and is clamped in place, at this time, the sealing o-rings 1.5 of the two check valves 1 are in interference fit with the inner wall of the upper shell 2, forming reliable sealing, and the assembly is completed.

[0038] Specifically, when the water flow is flowing forward, the pressure acts on the back of the check valve disc 4, the check valve disc 4 opens under the impact of the water flow, the silica gel plane 4.1 of the check valve disc 4 opens upward, driving the rocker shaft 4.3 to slide outward along the guide sliding groove 3 on the rocker seat 1.1.3, so that the check valve disc 4 can open a larger angle, enhancing the activity range of the check valve disc 4, on this basis, the opening is larger when flowing forward, and the flow area is also larger, thereby reducing the resistance to fluid flow and reducing the pressure drop loss; On the other hand, when the water flow stops or reverses, the tension spring 1.2 in the tension state can quickly pull the rocker shaft 4.3 along the guide sliding groove 3 to the corresponding position of the two rocker seats 1.1.3, and then drive the opened check valve disc 4 to fit with the inclined surface 1.1.2 of the check valve shell 1.1, instantaneously cutting off the flow path, realizing the anti-leakage sealing, and effectively preventing the water hammer phenomenon; At the same time, through the series working of the two check valves 1, even if one of them cannot seal due to failure, the other can still work normally, providing double anti-backflow protection, greatly reducing the risk of water meter idling.

[0039] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] In addition, the terms "first", "second", etc. are used herein only to describe different instances, and do not imply or suggest relative importance or a number of the technical features indicated. Thus, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0041] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected or can communicate with each other; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0043] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A double check valve structure for preventing leakage, comprising two check valves arranged in series and an upper housing for accommodating the two check valves, characterized in that: the check valve is composed of a check valve housing, a tension spring, a check valve cover, a silica gel flat washer and a sealing o-ring; the check valve housing is provided with a first small groove, and is further provided with a bevel, a rocker seat, an elastic bevel and a sealing ring groove; the check valve cover is provided with a bonding surface, and the silica gel flat washer is bonded to the bonding surface of the check valve cover by rubber adhesive to form a check valve clapper; the sealing o-ring is nested in the sealing ring groove of the check valve housing.

2. The leak-proof double check valve structure according to claim 1, wherein the check valve clapper is further provided with a silica gel flat surface, a second small groove, a rocker shaft and a concave bevel groove, and the check valve clapper is rotatably installed in the rocker seat through the rocker shaft.

3. The leak-proof double check valve structure according to claim 2, wherein the silica gel flat surface is closely attached to the bevel in the closed state.

4. The leak-proof double check valve structure according to claim 3, wherein the silica gel flat surface of the check valve clapper and the bevel of the check valve housing are in surface contact, and the inclination angle at the contact surface is thirty to sixty degrees.

5. The leak-proof double check valve structure according to claim 4, wherein one end of the tension spring is fixed in the second small groove, and the other end is fixed in the first small groove.

6. The leak-proof double check valve structure according to claim 5, wherein the depth of the concave bevel groove is 1.2-1.5 times the diameter of the tension spring, and the width is 1.1-1.3 times the diameter of the tension spring.

7. The leak-proof double check valve structure according to claim 6, wherein the cross section of the sealing o-ring is circular or elliptical, and the outer surface of the sealing o-ring is closely attached to the inner wall of the upper housing.

8. The leak-proof double check valve structure according to claim 7, wherein the upper housing is provided with an inner flat surface and a notch groove for fixing the check valves, and the two check valves are axially installed in the inner part of the upper housing.

9. The leak-proof double check valve structure according to claim 8, wherein the bottom flat surface of one of the check valves is attached to the inner flat surface, and the elastic bevel of the other check valve is detachably embedded in the notch groove.

10. The leak-proof double check valve structure according to claim 9, wherein both rocker seats are provided with obliquely inclined guide sliding grooves, and the outer surface of the rocker shaft is rotatably arranged in the guide sliding grooves, thereby hingedly connecting the check valve clapper and the rocker seat.

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