Drainage device for preventing backflow of water

Abstract

The present invention relates to a drainage device for preventing wading backflow, comprising an installation sleeve with a stepped hole inside, in which a floating ball and a water-permeable plugging core are installed; the stepped hole in the installation sleeve is divided into a water leakage hole section, a conical section for matching with the floating ball to block the water leakage hole, a buoyancy valve section for accommodating the floating ball, and a water-permeable plugging core installation section for fixing and sealing the water-permeable plugging core; the water-permeable plugging core is provided with a water-permeable hole, and the upper end surface of the water-permeable plugging core is provided with a first groove for preventing the floating ball from blocking the water-permeable hole, and the water-permeable hole is connected to the first groove. The installation accessories involved in the present invention are few, and the installation is very convenient.

Description

Technical Field

[0001] The invention relates to a drainage device for preventing wading backflow. Background Art

[0002] For the engine and motor of ordinary vehicles, or for the motor of new energy vehicles, when the vehicle wades through water, external sewage will enter the engine or motor through the drainage holes of the engine or motor.

[0003] In order to solve this problem, a Chinese patent document with the authorization announcement number CN201953526U discloses a structure, including a valve housing 1, a bottom cover 4, a float 3, a guide seal ring 2 and an umbrella rod 8. The guide seal ring 2 is arranged above the umbrella rod 8 and is in a spherical crown shape; the umbrella rod 8 is installed in the water-permeable hole on the bottom cover 4, and the float 3 is sleeved on the umbrella rod 8. Water inlet holes 7 are arranged around the bottom cover 4. When wading, water enters from the water inlet hole 7 to float the float 3, driving the umbrella rod 8 and the guide seal ring 2 to block the drainage hole 6 on the upper part of the valve housing. When not wading, the water in the drainage hole 6 flows away through the water inlet hole 7.

[0004] The disadvantages of the above solution are:

[0005] First, there are many accessories involved, the structure is complicated, and it is not conducive to assembly;

[0006] Second, on the one hand, the water inlet hole 7 is arranged around the bottom cover 4, and on the other hand, the float 3 needs to drive the heavier umbrella rod 8 and the guide sealing ring 2. Therefore, when the sewage from the lower part enters, the movement of the float 3 is relatively delayed, and part of the sewage will enter the drainage hole before the guide sealing ring blocks the drainage hole, causing pollution to the drainage hole and affecting the blocking effect. Summary of the invention

[0007] The purpose of the present invention is to provide a drainage device for preventing water backflow, so as to solve the problem of complex structure and inconvenient assembly in the prior art.

[0008] To achieve the above-mentioned purpose, the present invention proposes a drainage device for preventing wading backflow, including an installation sleeve with a stepped hole inside, in which a float and a water-permeable plugging core are installed; the stepped hole in the installation sleeve is divided into a drainage hole section, a conical section for adapting to the float to block the drainage hole, a buoyancy valve section for accommodating the float, and a water-permeable plugging core installation section for fixedly sealing and installing the water-permeable plugging core; the water-permeable plugging core is provided with a water-permeable hole, and the upper end surface of the water-permeable plugging core is provided with a first groove for preventing the float from blocking the water-permeable hole, and the water-permeable hole is connected to the first groove.

[0009] The present invention involves few installation accessories and is very convenient to install.

[0010] In order to solve the second drawback pointed out in the background technology, the aperture of the lower hole section of the water-permeable hole is larger than that of the upper hole section of the water-permeable hole. Since the aperture of the lower hole section is larger than that of the upper hole section, the water flow will be accelerated after entering the water-permeable hole section, thereby forming a certain impact force on the float, so that the float quickly enters the conical section to block the water leakage hole.

[0011] Similarly, a second groove is provided on the lower end surface of the water-permeable plugging core, and the second groove is connected to the water-permeable hole. The cross-sectional area of ​​the second groove is larger than the water-permeable hole, so the water flow will accelerate after entering the water-permeable hole, thereby forming a certain impact force on the float, so that the float quickly enters the conical section to block the water leakage hole.

[0012] In order to facilitate the installation of the drainage device on the motor or engine housing, the installation sleeve is a threaded sleeve with external threads.

[0013] In order to facilitate the assembly of the water-permeable plugging core, the water-permeable plugging core and the water-permeable plugging core installation section are installed by threaded fixing and sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a drainage one-way valve for preventing water backflow in the prior art;

[0015] Figure 2 It is a structural schematic diagram of an embodiment provided by the present invention;

[0016] Figure 3 yes Figure 2 AA section view;

[0017] Figure 4 This is the structural diagram of the water-permeable plugging core;

[0018] Figure 5 It is the structural diagram of the drainage device and the motor installation;

[0019] In the figure: 1 is the valve housing, 2 is the guide seal ring, 3 is the float, 4 is the bottom cover, 6 is the drain hole, 7 is the water inlet hole, and 8 is the umbrella rod;

[0020] 20 is a drainage device, 10 is a screw sleeve, 11 is a float, 12 is a water-permeable plug, 101 is a drain hole, 102 is a tapered section, 103 is a buoyancy valve section, 105 is an external thread, 121 is a water-permeable hole, 122 is a first groove, 123 is a second groove, 30 is a motor housing, 31 is the inside of the motor housing, and 32 is the outside of the motor housing. DETAILED DESCRIPTION

[0021] like Figure 2 , 3A drainage device 20 for preventing water backflow shown in the figure includes a screw sleeve 10 with an external thread 105, and the screw sleeve 10 has an internal stepped hole. The relationship between the upper and lower positions is defined according to the orientation shown in the figure. The stepped hole is composed of a drainage hole section, an upwardly converging conical section 102, a buoyancy valve section 103 and a permeable plug installation section from the upper end to the lower end.

[0022] The water leakage hole section has the smallest aperture, the buoyancy valve section has the second largest aperture, and the water permeable plugging core installation section has the largest aperture. The water leakage hole section corresponds to the water leakage port on the upper end face of the screw sleeve, forming a water leakage hole 101. A floating ball 11 is arranged in the cavity of the buoyancy valve section 103. When the floating ball 11 floats, it enters the tapered section 102 adapted thereto, thereby blocking the water leakage hole 101. The water permeable plugging core installation section is used to install a water permeable plugging core 12, which is fixedly and sealedly assembled with the water permeable plugging core installation section through threads.

[0023] The structure of the water-permeable plugging core 12 is as follows: Figure 4 As shown, the upper end surface is connected to the buoyancy valve section 103. The water-permeable plugging core 12 includes a water-permeable hole 121, and the upper end surface of the water-permeable plugging core is provided with a first groove 122, and the first groove 122 is connected to the upper part of the water-permeable hole 121. The lower end surface of the water-permeable plugging core is provided with a second groove 123, and the second groove 123 is connected to the lower part of the water-permeable hole 121. The first groove 122 and the second groove 123 are arranged perpendicular to each other (as other embodiments, they can also be parallel to each other or at other angles). The water-permeable hole 121 is located at the center of the water-permeable plugging core or at any other position, as long as the upper and lower end surfaces are connected.

[0024] When assembling the drainage device 20 , firstly put the float ball 11 into the buoyancy valve section 103 , and then screw the water-permeable plugging core 12 into place.

[0025] Compared with the reference document of the background technology, the structure of this embodiment only needs to install the float 11 and the water-permeable plug 12 into the screw sleeve 10 in sequence, which is not only simple in structure but also easy to assemble.

[0026] The water-permeable plugging core 12 and the water-permeable plugging core installation section are screwed to achieve fixed sealing. As other implementations, other types of fixed sealing methods, such as bonding, etc., can also be used.

[0027] The drainage device of this embodiment can be used for the engine and motor of a general vehicle, or the motor of a new energy vehicle (the motor of a new energy vehicle is installed at the bottom of the vehicle). The motor of a new energy vehicle is used as an example for description.

[0028] like Figure 5 As shown, the upper end of the drainage device 20 corresponds to the interior 31 of the motor housing, and the lower end of the drainage device 20 corresponds to the exterior 32 of the motor housing; the drainage device 20 assembled in the above embodiment is installed into the drainage threaded hole on the motor housing 30, thus completing the installation of the drainage device on the motor.

[0029] Here’s how it works:

[0030] When the vehicle is wading, water will enter the buoyancy valve section 103 through the water permeable hole 121 of the water permeable plugging core, and the float 11 will rise synchronously with the water surface due to the buoyancy of the water until the drain hole 101 is completely blocked, thereby realizing the function of automatic closing when the vehicle is wading.

[0031] When the vehicle is traveling in a waterless area, if there is water inside the motor, due to the gravity of the water itself, the water flows to the outside of the motor housing through the water drain hole 101, the buoyancy valve section 103 and the water permeable hole 121 of the water permeable plug. At this time, the first groove 122 on the upper end surface of the water permeable plug is used to prevent the float from blocking the water permeable hole during drainage.

[0032] In addition, when the vehicle is wading, water enters the water hole 121 from the second groove 123 of the water-permeable plug. Since the cross-sectional area of ​​the second groove is larger than the water hole, the water flow will be accelerated after entering the water hole 121, thereby exerting a certain impact force on the float 11, so that the float 11 quickly enters the conical section 102 to block the drainage hole 101. Compared with the solution in the comparative document of the background technology that sets the water inlet hole around the bottom cover, it can prevent some sewage from entering the interior of the equipment. In order to achieve the above-mentioned effect of accelerating the water flow rate, the second groove can be transformed into a large-diameter section as the lower hole section of the water hole, and the aperture of the large-diameter section is larger than that of the upper hole section of the water hole; the second groove can also be transformed into a conical hole section that converges upward.

[0033] In order to achieve the above-mentioned purpose of impacting the float, preferably, the water-permeable hole should be set at the center or near the center of the water-permeable plug. This is because the water-permeable hole needs to be below the float when not wading, and the volume of the float 11 is basically the same as the buoyancy valve section 103, so the water-permeable hole is preferably set at the center or near the center.

[0034] The drain device 20 selects a screw sleeve structure to cooperate with the drain threaded hole to complete the fixed seal. As other embodiments, the drain device 20 may not use a screw sleeve structure, but adopt other fixed sealing methods, such as bonding to the drain hole with a sealant, or a commonly used fixed sealing method in the prior art.

Claims

1. A drainage device for preventing wading backflow, characterized in that: It comprises an installation sleeve with a stepped hole inside, in which a floating ball and a water-permeable plugging core are installed; the stepped hole in the installation sleeve is divided into a water leakage hole section, a tapered section adapted to the floating ball to block the water leakage hole, a buoyancy valve section for accommodating the floating ball, and a water-permeable plugging core installation section for fixing and sealing the water-permeable plugging core; the water-permeable plugging core is provided with a water-permeable hole, and the upper end surface of the water-permeable plugging core is provided with a first groove for preventing the floating ball from blocking the water-permeable hole, and the water-permeable hole is connected to the first groove; A second groove is provided on the lower end surface of the water-permeable plugging core, and the second groove is connected to the water-permeable hole; Wherein, the cross-sectional area of ​​the second groove is larger than the cross-sectional area of ​​the water permeable hole; The hole diameter of the lower hole section of the water permeable hole is larger than that of the upper hole section of the water permeable hole.

2. A drainage device for preventing wading backflow according to claim 1, characterized in that: The installation sleeve is a threaded sleeve with external threads.

3. The drainage device for preventing wading backflow according to claim 1, characterized in that: The water-permeable plugging core and the water-permeable plugging core installation section are installed by threaded fixing and sealing.

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