Drainage anti-freezing check valve and drainage system

Abstract

The utility model discloses a drainage anti-freezing check valve and a drainage system, and relates to the field of drainage systems, the drainage anti-freezing check valve comprises a valve body, a valve cover is installed on the valve body, a water escape valve is installed on the valve cover, the water escape valve comprises a water escape valve main body and a valve rod, a valve cavity communicated with the valve body is formed in the water escape valve main body, and a drainage hole is formed in one side of the water escape valve main body; the valve rod is in threaded connection with the water escape valve body, and the drainage hole can be communicated with the valve cavity or the drainage hole and the valve cavity can be blocked by rotating the valve rod. Manual or automatic water drainage can be achieved, and the purposes that it is guaranteed that the check valve and a pipeline of the check valve are not frozen to crack in winter, and safe and stable operation is achieved are achieved.

Description

Technical Field

[0001] This utility model relates to the field of drainage systems, and in particular to a drainage antifreeze check valve and a drainage system. Background Technology

[0002] With the frequent occurrence of extremely cold weather in winter, the safety and stability of subway station drainage systems, especially those in ventilation shafts and entrance / exit pits, are significantly threatened. Routine winter antifreeze measures for drainage systems primarily involve increased equipment inspections and opening backflushing valves to drain accumulated water from the pipes. Because most pits use a design where two pumps share a single backflushing pipe, and some employ a drain pipe design, simply opening the backflushing or drain valves is insufficient to completely drain the water from the pipes and check valves, leading to annual damage from frozen check valves and pipes. To prevent check valves and pipes from freezing, a common solution is to loosen the valve cover bolts of all potentially frozen check valves one by one, creating a gap between the valve cover and the valve body to allow water to continue draining. Once the temperature rises, the check valve covers are then tightened. Each line requires hundreds of check valves to be handled in this way every year, which is a huge amount of labor. It can also easily lead to aging and deformation of the check valve rubber gaskets and water-stopping diaphragms, affecting normal use later. In fact, if a large amount of water enters the station during this period, it poses a significant safety hazard. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a drainage antifreeze check valve and drainage system, which can realize manual or automatic water drainage, so as to ensure that the check valve and its pipeline are not frozen and cracked in winter, and to ensure safe and stable operation.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] In a first aspect, embodiments of this utility model provide a drainage antifreeze check valve, comprising a valve body, a valve cover mounted on the valve body, a drain valve mounted on the valve cover, the drain valve comprising a drain valve body and a valve stem, the drain valve body having a valve cavity communicating with the valve body, and a drain hole provided on one side of the drain valve body; the valve stem is threadedly connected to the drain valve body, and rotating the valve stem can enable the drain hole to communicate with the valve cavity, or block the drain hole and the valve cavity.

[0006] As a further implementation, the outer wall of the drain valve body is provided with external threads, which are used for threaded connection with the valve cover.

[0007] As a further implementation, the drain valve body has an internal thread section.

[0008] As a further implementation, the drain valve body has a prismatic structure for the drain hole portion.

[0009] As a further implementation, a knob is installed at one end of the valve stem extending out of the drain valve body.

[0010] As a further implementation, a valve disc is installed in the water-stopping part inside the valve body, and the valve disc adopts a rubber diaphragm valve structure.

[0011] As a further implementation, an extension is connected to one side of the valve disc, and the extension is pressed and fixed to the valve cover.

[0012] As a further implementation, a threaded hole is provided at the center of the valve cover.

[0013] Secondly, embodiments of this utility model also provide a drainage system, including the aforementioned drainage antifreeze check valve.

[0014] As a further implementation, one end of the valve body is connected to the water inlet pipe, and the other end is connected to the drain pipe.

[0015] The beneficial effects of this utility model are as follows:

[0016] This utility model's drain valve and check valve are internally connected, utilizing pipeline water pressure to drain water. When the room temperature is low and the valve stem is opened, water flows out through the valve stem gap and drain hole under water pressure. Further loosening of the valve stem increases the gap and water flow; conversely, tightening the valve stem stops the water flow. During normal use, the set screw can also be loosened to achieve automatic draining. It does not generate additional electricity or labor. It prevents the check valve and its piping from freezing and cracking in winter. Manual or automatic draining modes can be selected as needed, and operation is simple. It reduces the aging of the check valve's sealing gasket and rubber valve, extending its service life. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0018] Figure 1 This is a schematic diagram of the structure of the drainage antifreeze check valve according to one or more embodiments of the present invention;

[0019] Figure 2 This is a schematic diagram of the valve disc structure according to one or more embodiments of the present invention;

[0020] Figure 3 This is a schematic diagram of the valve cover structure according to one or more embodiments of the present invention;

[0021] Figure 4 This is a schematic diagram of the drain valve structure according to one or more embodiments of the present invention;

[0022] Figure 5 This is a schematic diagram of the internal structure of the drain valve according to one or more embodiments of the present invention.

[0023] The components are: 1. Valve body, 2. Valve cover, 3. Drain valve, 4. Pipe mounting hole, 5. Valve cover mounting hole, 6. Valve disc, 7. Drain hole, 8. External thread, 9. Knob, 10. Valve cavity, and 11. Drain valve body. Detailed Implementation

[0024] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0025] Example 1:

[0026] This embodiment provides a drainage antifreeze check valve. A drain valve 3 is installed on the valve cover 2 of the check valve. When the water pump starts to drain, the water pressure pushes open the valve disc 6 inside the check valve, and the water flows through the valve body 1 cavity and the drainage pipe into the outdoor pressure relief well. When the water pump stops, there is no water pressure at the bottom of the check valve, and the valve disc 6 is pushed back by the water pressure in the upper part of the valve body 1 pipe, which cuts off the water flow in the pipeline and plays the role of preventing backflow.

[0027] Specifically, such as Figures 1-3 As shown, the valve includes a valve body 1, a valve cover 2, a valve disc 6, and a drain valve 3. One end of the valve body 1 is used to connect to the inlet pipe, and the other end is used to connect to the drain pipe. Multiple pipe mounting holes 4 are provided at the corresponding ends of the valve body 1 to facilitate the installation of the inlet and drain pipes. Multiple valve cover mounting holes 5 are provided on one side of the valve body 1, and the valve cover 2 is installed by bolts installed in the valve cover mounting holes 5. The valve disc 6 (water-stopping part) is installed inside the valve body 1 and adopts a rubber diaphragm flap structure. An extension is connected to one side of the valve disc 6, and the end of the extension is a rectangular part, which is pressed and fixed by the valve body 1 and the valve cover 2.

[0028] like Figure 3 As shown, the valve cover 2 has a drain valve 3 mounting hole 11 at its center. The drain valve 3 mounting hole 11 is a threaded hole, which is drilled by a tap and has a smooth thread to facilitate the smooth installation and removal of the drain valve 3 and ensure good sealing after the drain valve 3 is installed.

[0029] like Figure 4 and Figure 5As shown, the drain valve 3 includes a drain valve body and a valve stem. A valve stem mounting cavity and a valve cavity 10 are coaxially arranged within the drain valve body. The valve cavity 10 and the valve stem mounting cavity are connected by a through hole, which can be sealed by the valve stem. After installation, the drain valve 3 connects the valve cavity 10 to the valve body 1. A drain hole 7 is provided on one side of the drain valve body, which connects to the valve stem mounting cavity, and the axis of the drain hole 7 is perpendicular to the axis of the valve cavity 10. The valve stem is installed within the valve stem mounting cavity, and its end is a tapered tip, which can block the through hole between the valve cavity 10 and the valve stem mounting cavity.

[0030] In this embodiment, the valve stem mounting cavity has an internal thread section, and the valve stem has an external thread section, achieving a threaded connection between the valve stem and the valve stem mounting cavity. Rotating the valve stem causes it to rise or fall. When the valve stem rises, the conical tip disengages from the through hole, allowing the drain hole 7 to connect with the valve cavity 10; conversely, when the valve stem falls, the conical tip blocks the through hole, preventing the drain hole 7 from connecting with the valve cavity 10. To facilitate rotation, a knob 9 is connected to the end of the valve stem extending from the drain valve body.

[0031] like Figure 4 As shown, the main body of the drain valve is a cylindrical structure. Following the view direction, the knob 9 is located at the top of the valve stem, and the bottom of the drain valve body has an external thread that mates with the drain valve body 11. A prismatic structure is located in the middle section of the drain valve body, and the drain hole 7 is located on this prismatic structure. This prismatic structure facilitates the installation of the drain valve 3 using tools such as wrenches.

[0032] The working principle of this embodiment is as follows:

[0033] The installed drain valve 3 is internally connected to the check valve. After each drainage, water accumulates in the check valve and the pipe above it, generating a certain water pressure. When the room temperature is low, the valve stem of drain valve 3 is opened, and water flows out through the threaded gap of the valve stem and the drain hole 7 under water pressure. If the valve stem is loosened further, the gap will widen and the water flow will increase. Conversely, if the valve stem of drain valve 3 is tightened, the water will stop. During normal use, the valve stem can also be loosened to achieve automatic drainage.

[0034] This embodiment utilizes pipeline water pressure to complete water drainage, without generating additional electricity or labor costs; it can avoid damage to the drainage system's check valve and its pipelines due to freezing in winter; manual or automatic drainage can be selected as needed, and operation is simple; it can reduce the aging of check valve gaskets and rubber valves, extending their service life.

[0035] Example 2:

[0036] This embodiment provides a drainage system, including the drainage antifreeze check valve described in Embodiment 1. One end of the check valve body 1 is connected to the inlet pipe, and the other end is connected to the drain pipe.

[0037] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A drainage antifreeze check valve, comprising a valve body, wherein a valve cover is mounted on the valve body, characterized in that, The valve cover is equipped with a drain valve, which includes a drain valve body and a valve stem. The drain valve body has a valve cavity that communicates with the valve body, and a drain hole is provided on one side of the drain valve body. The valve stem is threadedly connected to the drain valve body. Rotating the valve stem can make the drain hole communicate with the valve cavity, or block the drain hole and the valve cavity.

2. The drain antifreeze check valve according to claim 1, characterized in that, The outer wall of the drain valve body is provided with external threads, which are used for threaded connection with the valve cover.

3. A drainage antifreeze check valve according to claim 1 or 2, characterized in that, The drain valve body has an internal thread section.

4. A drainage antifreeze check valve according to claim 1 or 2, characterized in that, The drain valve body has a prismatic structure for the drain hole portion.

5. A drainage antifreeze check valve according to claim 1, characterized in that, A knob is installed at one end of the valve stem that extends out of the drain valve body.

6. A drainage antifreeze check valve according to claim 1, characterized in that, The valve disc is installed in the water-stopping part inside the valve body, and the valve disc adopts a rubber diaphragm valve structure.

7. A drainage antifreeze check valve according to claim 6, characterized in that, One side of the valve disc is connected to an extension, which is pressed and fixed to the valve cover.

8. A drainage antifreeze check valve according to claim 1, characterized in that, The valve cover has a threaded hole at its center.

9. A drainage system, characterized in that, Includes the drain antifreeze check valve as described in any one of claims 1-8.

10. A drainage system according to claim 9, characterized in that, One end of the valve body is connected to the water inlet pipe, and the other end is connected to the drain pipe.

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