Check valve applied to sewage lifting device and provided with backflow structure
By designing a check valve with a reflux structure on the sewage lifting device and using a screw mechanism and O-ring radial seal, the problems of sewage being unable to be emptied and poor sealing are solved, effective sealing and detachable replacement are achieved, and maintenance costs are reduced.
Patent Information
- Application Number
- CN202421841892.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The general check valve of the existing sewage lifting device lacks a reflux structure, which makes it impossible to drain the sewage in the pipeline, resulting in poor sealing effect and high replacement cost.
A check valve with a backflow structure is designed. The valve plate is lifted and sealed by a screw mechanism, and an O-ring is used for radial sealing. The valve body and base can be disassembled to replace the valve plate.
It realizes the sewage backflow function, avoids pipe overflow, improves the sealing effect and reduces the replacement cost.
Smart Images
Figure CN223360001U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of check valves, in particular to a check valve which is applied to a sewage lifting device and has a reflux structure. Background Art
[0002] The check valves used in current sewage lifting devices are usually universal check valves. Universal check valves mean that the check valves can be used in sewage lifting devices as well as in sewage pumps, rainwater pumps, tap water booster pumps and other pump products. However, universal check valves have disadvantages:
[0003] 1. Some general-purpose check valves do not have a backflow structure (the internal valve core can be opened through an external rotating structure to allow the sewage in the pipe to flow back to the collecting tank through the check valve). As a result, when the sewage lifting device is overhauled or the pipeline needs to be dismantled, the sewage in the pipeline cannot be emptied, causing the sewage in the pipeline to overflow.
[0004] 2. Universal check valves in pipelines all use a "flange plus rubber flat gasket" seal, which is a flat seal. This flat seal is not suitable for use in sewage lifting systems. The check valve of a sewage lifting system is connected to the sewage lifting system's water collection tank, which is typically made of plastic through a rotational molding process. This material and molding method cannot guarantee the flatness and strength of the water collection tank surface connected to the sewage lifting system check valve. Therefore, universal check valves using flat seals do not provide an effective seal in sewage lifting systems.
[0005] 3. When some general check valves are damaged, they need to be replaced as a whole. It is impossible to replace the valve plate inside the check valve alone, which increases the cost.
[0006] To this end, a check valve with a reflux structure for use in a sewage lifting device is proposed. Utility Model Content
[0007] In view of the above problems, the present invention provides a check valve applied to a sewage lifting device and having a backflow structure, so as to solve the problems raised in the above background technology.
[0008] The technical solution of the utility model is:
[0009] A check valve used in a sewage lifting device and having a backflow structure comprises a check valve body and a stopper of a water collecting tank of the sewage lifting device, the check valve body being installed on the surface of the stopper of the water collecting tank of the sewage lifting device, a flange stopper being provided at the bottom of the outer surface of the check valve body, a screw rod being threadedly connected to the upper surface of the flange stopper, a first O-ring being provided on the outer surface of the screw rod, a second O-ring being provided at the bottom of the flange stopper, a check valve plate being hinged at the inner center of the flange stopper, a check valve base being provided on the inner wall of the bottom of the flange stopper, and a third O-ring being provided on the outer surface of the check valve base.
[0010] The working principle of the above technical solution is as follows:
[0011] In the process of the screw rod moving into the check valve body, since the diameter of the threaded part of the screw rod is larger than the diameter of the sliding hole in the semi-threaded hole of the check valve body, the screw rod will not completely enter the check valve body. The threaded part of the screw rod exceeds the thread in the semi-threaded hole of the check valve body and cannot rotate inward any further. At this time, the valve plate and the check valve base present the maximum angle, and the two circles of O-rings on the screw rod are still in the semi-threaded holes of the check valve body, and the sewage in the check valve body will not flow out through the semi-threaded holes.
[0012] In a further technical solution, the second O-ring is sleeved on the flange stop surface of the check valve body.
[0013] Through the above technical solution, the check valve body and the stop of the water collecting tank of the sewage lifting device are locked by bolts, and the O-ring is pressed between the flange stop and the stop of the water collecting tank of the sewage lifting device to achieve radial sealing.
[0014] In a further technical solution, the non-threaded part of the screw rod surface is provided with two circle grooves, the first O-ring is located in the groove of the screw rod, the screw rod is located in the semi-threaded hole of the check valve body, and under normal circumstances, the end of the first O-ring is flush with the outer surface of the check valve body.
[0015] Through the above technical solution, in this state, the valve plate in the check valve body and the check valve base contact each other to achieve the non-return effect of the check valve. When the sewage in the sealed pipe needs to be drained, a flat-blade screwdriver is used to pass through the flat-blade slot at the end of the screw rod and rotate the screw rod clockwise. The screw rod will rotate inward in the semi-threaded hole of the check valve body, and gradually approach the valve plate and finally lift the valve plate. The sewage in the sealed pipe will flow back into the water collecting tank of the sewage lifting device through the gap between the lifted valve plate and the check valve base.
[0016] In a further technical solution, an annular groove is provided on the outer surface of the check valve base, the third O-ring is arranged in the annular groove of the check valve base, and the check valve base and the check valve body are connected to each other.
[0017] In a further technical solution, a semicircular groove is provided on the surface of the check valve base, and the check valve plate is located in the semicircular groove of the check valve base.
[0018] In a further technical solution, the check valve body and the check valve base are connected to each other.
[0019] Through the above technical solution, the valve plate is clamped between the check valve body and the check valve base, and the check valve body and the check valve base are radially sealed by an O-ring. Replacement can be done by separating the check valve body and the check valve base to replace the valve plate.
[0020] Compared with the prior art, the present invention has the following beneficial effects:
[0021] The screw mechanism with backflow function can allow the sewage in the closed pipe to flow back to the collecting tank of the sewage lifting device through the check valve. When the pipe is removed or maintained later, the sewage is prevented from overflowing from the sewage lifting device and the pipe. The sealing form adopts "O-ring plus stop" radial seal, which is used on the sewage lifting device. The sealing effect is better than the flat seal of the general check valve. The internal valve plate of the check valve can be replaced to reduce after-sales cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0023] Figure 2 This is a structural diagram of the check valve body of the utility model being installed at the stop of the water collecting tank of a sewage lifting device;
[0024] Figure 3 This is a schematic diagram of the closing structure of the check valve plate and the check valve base of the utility model;
[0025] Figure 4 The utility model is a structural schematic diagram of a screw rod lifting a check valve plate.
[0026] Description of reference numerals:
[0027] 1. Check valve body; 2. Screw; 3. First O-ring; 4. Second O-ring; 5. Check valve plate; 6. Third O-ring; 7. Check valve base; 8. Water collecting tank stop for sewage lifting device; 10. Flange stop; 11. Semi-threaded hole in the check valve body. DETAILED DESCRIPTION
[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.
[0029] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this 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.
[0030] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc. should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0031] Example:
[0032] See also Figure 1-4 A check valve used in a sewage lifting device and having a backflow structure, comprising a check valve body 1 and a water collection tank stop 8 of the sewage lifting device, the check valve body 1 being mounted on the surface of the water collection tank stop 8 of the sewage lifting device, a flange stop 10 being provided at the bottom of the outer surface of the check valve body 1, a screw rod 2 being threadedly connected to the upper surface of the flange stop 10, a first O-ring 3 being sleeved on the outer surface of the screw rod 2, a second O-ring 4 being sleeved on the bottom of the flange stop 10, the second O-ring 4 being sleeved on the surface of the flange stop 10 of the check valve body 1, a check valve being hinged at the inner center of the flange stop 10 The check valve plate 5 and the bottom inner wall of the flange stop 10 are provided with a check valve base 7, and the outer surface of the check valve base 7 is sleeved with a third O-ring 6. The non-threaded part of the surface of the screw rod 2 is provided with two circle grooves. The first O-ring 3 is located in the groove of the screw rod 2, and the screw rod 2 is located in the semi-threaded hole 11 of the check valve body. Under normal circumstances, the end of the first O-ring 3 is flush with the outer surface of the check valve body 1. The check valve body 1 and the stop 8 of the water collecting tank of the sewage lifting device are locked by bolts, and the O-ring 4 is pressed between the flange stop 10 and the stop 8 of the water collecting tank of the sewage lifting device to achieve radial sealing.
[0033] The working principle of the above technical solution is as follows:
[0034] In the process of the screw rod 2 moving into the check valve body 1, since the diameter of the threaded portion of the screw rod 2 is larger than the diameter of the sliding hole in the semi-threaded hole 11 of the check valve body 1, the screw rod 2 will not completely enter the check valve body 1. The threaded portion of the screw rod 2 exceeds the thread in the semi-threaded hole 11 of the check valve body 1 and cannot rotate inward any further. At this time, the valve plate 5 and the check valve base 7 present the maximum angle, and the two circles of O-rings 3 on the screw rod 2 are still in the semi-threaded hole 11 of the check valve body 1, and the sewage in the check valve body 1 will not pass through the semi-threaded hole 11. The water flows outward from the hole 11 of the check valve body 1. In this state, the valve plate 5 in the check valve body 1 contacts the check valve base 7 to achieve the non-return effect of the check valve. When the sewage in the sealed pipe needs to be emptied, a flat-head screwdriver is used to pass through the flat-head slot at the end of the screw rod and rotate the screw rod 2 clockwise. The screw rod 2 will rotate inward in the semi-threaded hole 11 of the check valve body 1, and gradually approach the valve plate 5 and finally lift the valve plate 5. The sewage in the sealed pipe will flow back to the water collecting tank of the sewage lifting device through the gap between the lifted valve plate 5 and the check valve base 7.
[0035] See also Figure 1 and Figure 3 The outer surface of the check valve base 7 is provided with an annular groove, the third O-ring 6 is sleeved in the annular groove of the check valve base 7, the check valve base 7 and the check valve body 1 are connected to each other, the surface of the check valve base 7 is provided with a semicircular groove, the check valve plate 5 is located in the semicircular groove of the check valve base 7, and the check valve body 1 and the check valve base 7 are connected to each other.
[0036] The valve plate 5 is clamped between the check valve body 1 and the check valve base 7, and the check valve body 1 and the check valve base 7 are radially sealed by an O-ring 6. The valve plate 5 can be replaced by separating the check valve body 1 from the check valve base 7.
[0037] When working, a screw rod 2 structure is set on the check valve body 1, and the screw rod 2 can move toward the inside of the check valve body 1 by rotating, so that the screw rod 2 contacts the check valve plate 5 inside the check valve body 1, and the check valve plate 5 is lifted, so that the sewage in the pipeline can flow back through the inside of the check valve to the water collecting tank of the sewage lifting device and then remove the pipeline. At the same time, the non-threaded part of the screw rod 2 is also provided with two rings of the first O-ring 3 for sealing, so as to ensure the sealing of the screw rod 2 while moving on the check valve body 1. In terms of formula, flat sealing is no longer used, but a "flange stop 10 plus O-ring" structure is adopted. This structure is a radial seal, which can avoid the water collecting tank of the sewage lifting device. Due to the plane defects caused by the rotational molding process of the plastic material, the strength is insufficient, and the seal fails. The check valve plate 5 is clamped by the check valve body 1 and the check valve base. The check valve body 1 and the check valve base 7 can be completely disassembled. Axial sealing is achieved between the check valve body 1 and the check valve base 7 in the form of an O-ring to ensure the overall airtightness of the check valve.
[0038] The above-described embodiments merely represent specific implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.
Claims
1. A check valve with a reflux structure used in a sewage lifting device, characterized in that: The invention comprises a check valve body (1) and a water collecting tank stop (8) of a sewage lifting device, wherein the check valve body (1) is installed on the surface of the water collecting tank stop (8) of the sewage lifting device, a flange stop (10) is provided at the bottom of the outer surface of the check valve body (1), a screw rod (2) is threadedly connected to the upper surface of the flange stop (10), a first O-ring (3) is sleeved on the outer surface of the screw rod (2), a second O-ring (4) is provided at the bottom of the flange stop (10), a check valve plate (5) is hinged at the inner center of the flange stop (10), a check valve base (7) is provided on the inner wall of the bottom of the flange stop (10), and a third O-ring (6) is sleeved on the outer surface of the check valve base (7).
2. A check valve with a reflux structure used in a sewage lifting device according to claim 1, characterized in that: The second O-ring (4) is sleeved on the surface of the flange stop (10) of the check valve body (1).
3. A check valve with a reflux structure used in a sewage lifting device according to claim 1, characterized in that: The non-threaded portion of the surface of the screw rod (2) is provided with two circular grooves, the first O-ring (3) is located in the groove of the screw rod (2), the screw rod (2) is located in the semi-threaded hole (11) of the check valve body, and the end of the first O-ring (3) is flush with the outer surface of the check valve body (1) under normal conditions.
4. A check valve with a reflux structure used in a sewage lifting device according to claim 1, characterized in that: The outer surface of the check valve base (7) is provided with an annular groove, the third O-ring (6) is sleeved in the annular groove of the check valve base (7), and the check valve base 7 and the check valve body 1 are butted against each other.
5. A check valve with a backflow structure used in a sewage lifting device according to claim 1, characterized in that: A semicircular groove is provided on the surface of the check valve base (7), and the check valve plate (5) is located in the semicircular groove of the check valve base (7).
6. A check valve with a reflux structure used in a sewage lifting device according to claim 1, characterized in that: The check valve body (1) and the check valve base (7) are connected to each other.