Check valve

Abstract

The utility model belongs to the technical field of valve switches, and relates to a check valve. According to the main technical scheme, the valve comprises a valve body composed of an upper valve cylinder and a lower valve cylinder, a valve cover covering the end of the upper valve cylinder and a valve element mechanism arranged in the valve body, and a water inlet hole is formed in the cylinder wall of the lower valve cylinder; wherein a movable connection structure is arranged between the valve cover and the upper valve cylinder; the valve element mechanism is composed of an inner barrel and a switching mechanism, the inner barrel can be movably fixed to the inner wall of the valve body and is provided with a table ring, the switching mechanism can achieve opening and closing of the inner barrel, the inner barrel penetrates into the lower valve body, and a plurality of water holes wrapped by permeable geotextile are formed in the side wall of the inner barrel. The check valve with the structure has the characteristic of long service life due to the fact that the valve core which is tightly pasted by silt can be replaced.

Description

Technical Field

[0001] The utility model belongs to the technical field of valve switches, and particularly relates to a check valve. Background Art

[0002] A check valve is a mechanism arranged at the bottom of a canal for balancing the groundwater pressure and preventing the excessive groundwater pressure from arching the ground at the bottom of the canal, resulting in the canal being unable to transport canal water normally. The structure of the check valve includes a valve body composed of a valve barrel, a valve cover covering the end of the valve barrel, and a valve core mechanism arranged in the valve body. Among them, the lower end of the valve body is communicated with the groundwater, the valve cover is used to control the outflow of groundwater and prevent the sediment in the surface water of the irrigation canal from entering the valve body, and the valve core mechanism arranged in the valve body is used to control the opening and closing of the groundwater discharge.

[0003] In the section where the soil of the built irrigation canal is relatively soft, the sand content in the groundwater is relatively high. Since the valve barrel constituting the check valve is directly communicated with the groundwater, after a long time of accumulation, the sediment in the groundwater is very likely to block the valve body constituting the check valve, resulting in the failure of the check valve. To solve this problem, a number of water inlet holes are arranged on the barrel wall and the bottom of the valve barrel, and then it is coated with geotextile to achieve the purpose of sediment isolation through the geotextile. However, after the check valve with this structure operates for a period of time, the sediment will paste the coated geotextile tightly, which will also cause the failure of the check valve, and the function of the check valve cannot be restored through maintenance. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a check valve with a long service life that can be maintained and have its components replaced.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A check valve includes a valve body composed of upper and lower valve barrels, a valve cover covering the end of the upper valve barrel, and a valve core mechanism arranged in the valve body. The barrel wall of the lower valve barrel is provided with water inlet holes; it is characterized in that:

[0007] The valve cover and the upper valve barrel are in an activity connection structure;

[0008] The valve core mechanism is composed of an inner cylinder with a stepped ring that can be movably fixed to the inner wall of the valve body and a switching mechanism that can open and close the inner cylinder. The inner cylinder extends into the lower valve barrel, and a number of water holes wrapped with permeable geotextile are arranged on its side wall.

[0009] The additional technical features constituting the above-mentioned check valve further include:

[0010] 1. The switching mechanism is composed of a switching piece fixed to the stepped ring through a shaft;

[0011] 2. The switch mechanism is composed of a sealing disk with water holes arranged around its circumference and a diameter matching that of the upper valve cylinder;

[0012] 3. The upper valve cylinder constituting the valve body is flush with the ground of the irrigation canal and higher than the top surface of the valve cover, forming a concave structure; a removable cover plate corresponding to the thickness thereof is provided on the top surface of the valve cover constituting the concave structure;

[0013] 4. The cover plate is made of soft rubber and plastic material.

[0014] The utility model provides a check valve with the following characteristics: first, since the valve core mechanism constituting the check valve is composed of an inner cylinder with a stage ring that can be movably fixed to the inner wall of the valve body and a switch mechanism that can realize the switch of the inner cylinder, a plurality of water holes are arranged on the side wall of the inner cylinder and covered with a water-permeable geotextile, when the mud and sand of the groundwater make the geotextile tightly waterproof, the valve core mechanism can be replaced, thereby extending the service life of the check valve and effectively avoiding the water channel project from being damaged due to the water stop during its design and use period. The failure of the internal components of the valve leads to the failure of the check valve, which affects the operation of the canal; secondly, since the valve ring constituting the valve body of the check valve is higher than the top surface of its valve cover, a recessed structure is formed, which can effectively avoid the destructive wear of the valve cover of the check valve by flowing mud and sand in the canal with a large slope, and effectively extend the service life of the valve cover and the check valve as a whole; thirdly, a removable cover plate corresponding to its thickness is provided on the top surface of the valve cover in the recessed structure constituting the valve cover of the check valve, which is particularly convenient for the installation and construction of the check valve body in the canal. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a check valve provided by the utility model;

[0016] Figure 2 This is a schematic diagram of the second structure of the check valve. DETAILED DESCRIPTION

[0017] The structure and working principle of the check valve provided by the utility model are further described in detail below in conjunction with the accompanying drawings.

[0018] like Figure 1As shown in the figure, it is a schematic structural diagram of a check valve provided by the present utility model. The structure of the check valve includes a valve body 1 composed of upper and lower valve barrels 11 and 12 which are integrally structured, a valve cover 2 covering the upper end of the upper valve barrel, and a valve core mechanism 3 disposed in the valve body. Among them, the valve cover 2 and the upper valve barrel 11 are structurally connected by a screw thread 21 (or a plugging mechanism), and the two can be disassembled and assembled. The valve core mechanism 3 is composed of a switch mechanism 31 formed by an inner cylinder 32 with a stepped ring 35 and a switch piece 312 fixed by a shaft 311. The inner cylinder 32 constituting the valve core mechanism 3 is movably fixed to the valve body through the stepped ring 35 by a screw thread 21 (or a plugging mechanism) and extends into the lower valve barrel 12 whose barrel wall is provided with a water inlet hole 121 to form a check valve. A number of water holes 33 are provided on the side wall of the inner cylinder and are covered by a water-permeable geotextile 34.

[0019] During use, the lower end of the valve body 1 constituting the valve body is communicated with the groundwater (or communicated with the groundwater collection pipeline, or inserted into the groundwater collection gravel pit). The high-pressure groundwater enters the inner cylinder through the water inlet hole 121 of the lower valve barrel and the water holes 33 on the inner cylinder covered with the water-permeable geotextile. The switch mechanism 31 is opened by the hole 36 at the upper bottom of the inner cylinder, and then discharged to the ground through the valve cover 2 provided with a water outlet hole 22, which can reduce the groundwater pressure and effectively prevent the phenomenon that the bottom of the water channel is arched by the high-pressure groundwater. When the check valve has been operating for a period of time and the sediment in the groundwater has sealed the geotextile tightly and made it impermeable to water, the valve cover 2 can be removed, and then the valve core mechanism with the inner cylinder can be removed, replaced (the wrapped geotextile can also be replaced) with a new valve core mechanism, and then the valve cover can be reset. That is, without damaging the upper and lower valve bodies constituting the check valve, the valve core can be updated, the service life of the check valve is extended, and it is effectively avoided that during the designed service period of the irrigation canal project, the check valve will not fail due to the failure of the internal components of the check valve, resulting in the influence on the operation of the water channel.

[0020] In the structure of the above-mentioned check valve,

[0021] 1. The switch mechanism 31 constituting the valve core mechanism 3 can also be, for example, Figure 2 a stainless steel composite silica gel sealing disc 314 with a diameter matching that of the valve barrel 1 and having water-emitting holes 313 provided on its circumference. That is, the stainless steel composite silica gel sealing disc 314 can move up and down in the upper valve barrel 11 constituting the valve body 1. Figure 1 The check valve shown is that the high-pressure groundwater realizes its function of discharging groundwater and preventing backflow of surface water through opening and closing the switch piece 312. The Figure 2The structure of the check valve is that high-pressure groundwater pushes up the stainless steel composite silicone sealing disk 314, and the groundwater emerges from the ground through the water emitting holes 313 arranged around it to achieve groundwater pressure relief. After the groundwater pressure is relieved, the stainless steel composite silicone sealing disk 314 falls back onto the inner cylinder 32 with the platform ring 35 to achieve the closing function, that is, the check valve realizes the function of removing groundwater and balancing its water pressure.

[0022] 2. In order to meet the requirement that the check valve of this structure can be used in a canal with a large slope, so as to overcome the destructive wear of the gravel in the flowing water on the valve body (upper valve cylinder 11) and the valve cover 2 of the check valve, the upper valve cylinder 11 constituting the valve body is flush with the bottom surface 4 of the canal and higher than the top surface 24 of the valve cover, forming a concave 23 structure; that is, due to the large slope of the canal bottom, the gravel will be wrapped by the high-speed flowing water and flow through the concave 23 structure, so the impact of the gravel on the valve body and the valve cover can be effectively avoided, greatly extending its service life;

[0023] 3. In order to facilitate the installation of the check valve during canal construction, the top surface 25 of the upper valve cylinder 11 of the check valve body 1 is made flush with the canal bottom 4, and the valve ring 11 of the valve body and the top surface 24 of the valve cover form a concave structure 23, and a removable cover plate 5 corresponding to its thickness is provided on the top surface of the valve cover constituting the concave structure; when the canal bottom construction is completed, the cover plate 5 is removed, and the concave structure 23 can be formed in which gravel will be wrapped by high-speed water and flow through; wherein the cover plate is made of soft rubber and plastic material, which is more convenient to install and remove, and has the characteristic of convenient construction.

Claims

1. A check valve, comprising a valve body consisting of an upper valve cylinder and a lower valve cylinder, a valve cover covering the end of the upper valve cylinder and a valve core mechanism arranged in the valve body, wherein the cylinder wall of the lower valve cylinder has a water inlet hole; characterized in that: The valve cover and the upper valve cylinder are in a movable connection structure; The valve core mechanism is composed of an inner cylinder with a stage ring that can be movably fixed to the inner wall of the valve body and a switch mechanism that can realize the switch of the inner cylinder. The inner cylinder penetrates into the lower valve cylinder, and its side wall is provided with a plurality of water holes covered with permeable geotextile.

2. The check valve according to claim 1, characterized in that: The switch mechanism is composed of a switch sheet fixed on the table ring through a shaft.

3. The check valve according to claim 1, characterized in that: The switch mechanism is composed of a sealing disk with water-emission holes arranged around its circumference and a diameter matching that of the upper valve cylinder.

4. A check valve as claimed in claim 1, wherein: The upper valve cylinder constituting the valve body is flush with the ground of the irrigation channel and higher than the top surface of the valve cover, forming a concave structure; a removable cover plate corresponding to its thickness is arranged on the top surface of the valve cover constituting the concave structure.

5. The check valve according to claim 4, characterized in that: The cover plate is made of soft rubber and plastic material.

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