Anti-overflow device for sewage suction truck

Abstract

A sewage suction truck overflow prevention device comprises an air inlet cylinder and an air outlet pipe, the air inlet cylinder is located below the air outlet pipe, a float is placed in the air inlet cylinder, and a distance is left between the float and the air outlet pipe, and the characteristic is that: the upper end of the air inlet cylinder is connected to a mounting seat, a wave-breaking cylinder for preventing liquid from entering is arranged outside the air inlet cylinder, an inlet for air flow is left at the upper end of the wave-breaking cylinder, an air flow channel is left between the side wall of the wave-breaking cylinder and the side wall of the air inlet cylinder, the lower end of the wave-breaking cylinder is fixedly connected to the outer periphery of the air inlet cylinder to form a closure, a concave float support plate is provided at the lower part of the air inlet cylinder, the float support plate is conical, a liquid inlet hole is provided at the center of the bottom end of the conical float support plate, the diameter of the liquid inlet hole is smaller than the diameter of the float, the float is placed on the float support plate to block the liquid inlet hole, a vent is provided on the side wall of the air inlet cylinder to communicate with the air flow channel, and the vent is located above the float support plate.

Description

Technical Field

[0001] The invention relates to the technical field of sewage suction trucks, and in particular to an anti-overflow device for sewage suction trucks. Background Art

[0002] Vacuum pumps on the sewage suction trucks on the market often get stuck. One of the main reasons for not working is that sewage enters the pump. To address this problem, vacuum pump manufacturers have designed an anti-overflow valve installed on the tank to solve this problem. However, this structure has little effect on media with a large number of bubbles such as septic tanks and sewage wells. The anti-overflow valve on the market relies on the buoyancy of sewage to float the ball to block the medium from entering the vacuum pump. In actual use, the bubbles float on the liquid surface, and the liquid surface has not yet floated the float ball, and the full alarm device of the vehicle has not alarmed, but the bubbles on the liquid surface have entered the air intake cylinder, and after being sucked into the vacuum pipe and ruptured, they condense into water. The commonly used rotary vane vacuum pumps on the market do not allow water to enter. After water enters, the vacuum pump is very likely to be stuck and damaged because water cannot be compressed. When used in areas with high temperatures, a very small amount of water can be evaporated by the vacuum pump along with the air. However, when used in areas below zero degrees, the temperature of the vacuum pump itself is not high, and the water cannot be taken away and evaporated, and even freezes. This working condition is very likely to cause damage to the vacuum pump. In this way, in order to prevent the bubbles on the liquid surface from being sucked into the vacuum pipe, the sewage suction truck must stop sucking before the sewage reaches the rated capacity. Summary of the invention

[0003] In order to solve the above problems in the prior art, the present invention provides an anti-overflow device for a sewage suction truck, which can prevent bubbles from entering the vacuum pump. The technical solution of the present invention is as follows:

[0004] A sewage suction truck overflow prevention device comprises an air intake cylinder (3) and an air outlet pipe (2), wherein the air intake cylinder (3) is located below the air outlet pipe (2), a floating ball (4) is placed in the air intake cylinder (3), a spacing is left between the floating ball (4) and the air outlet pipe (2), the upper end of the air intake cylinder (3) is connected to a mounting seat (5), a wave-proof cylinder (1) for preventing liquid from entering is arranged outside the air intake cylinder (3), an inlet for air flow to enter is left at the upper end of the wave-proof cylinder (1), an air flow channel is left between the side wall of the wave-proof cylinder (1) and the side wall of the air intake cylinder (3), and a lower portion of the wave-proof cylinder (1) is provided with a plurality of air-flow passages. The end is fixedly connected to the outer periphery of the air inlet cylinder (3) to form a closure, the lower part of the air inlet cylinder (3) is provided with a concave float support plate (7), the float support plate (7) is conical, and a liquid inlet hole (8) is provided at the center of the bottom end of the conical float support plate (7), the diameter of the liquid inlet hole (8) is smaller than the diameter of the float (4), the float (4) is placed on the float support plate (7) to block the liquid inlet hole (8), and a vent hole (6) is provided on the side wall of the air inlet cylinder (3) to communicate with the air flow channel, and the vent hole (6) is located above the float support plate (7).

[0005] The diameter of the liquid inlet hole (8) is 3 / 10 to 1 / 2 of the diameter of the float ball (4).

[0006] The air flow inlet at the upper end of the wave-breaking tube (1) is at least 200 mm higher than the alarm liquid level.

[0007] An outer flange (10) is provided on the outer periphery of the air inlet cylinder (3), an inner flange (9) is provided at the lower end of the wave-breaking cylinder (1), and the wave-breaking cylinder (1) is fixedly connected to the outer flange (10) of the air inlet cylinder (3) via the inner flange (9).

[0008] The air outlet pipe (2) is arranged in the mounting seat (5), the upstream end of the air outlet pipe (2) is located above the float, and the downstream end of the air outlet pipe (2) extends out of the mounting seat (5) and is used to connect to the air extraction pipe of the vacuum pump.

[0009] An upper cover is provided at the upper end of the mounting seat (5), and the downstream end of the air outlet pipe (2) extends out from the side wall of the mounting seat (5).

[0010] The diameter of the float ball (4) is larger than the aperture of the air outlet pipe (2).

[0011] The above technical solution comprises an air inlet cylinder (3) and an air outlet pipe (2), wherein the air inlet cylinder (3) is located below the air outlet pipe (2), a floating ball (4) is placed in the air inlet cylinder (3), a distance is left between the floating ball (4) and the air outlet pipe (2), the upper end of the air inlet cylinder (3) is connected to a mounting seat (5), a wave-breaking cylinder (1) is arranged outside the air inlet cylinder (3) for preventing liquid from entering, an inlet for air flow is left at the upper end of the wave-breaking cylinder (1), an air flow channel is left between the side wall of the wave-breaking cylinder (1) and the side wall of the air inlet cylinder (3), and the lower end of the wave-breaking cylinder (1) is provided with a plurality of air-flow passages. The end is fixedly connected to the outer periphery of the air inlet cylinder (3) to form a closure, the lower part of the air inlet cylinder (3) is provided with a concave float support plate (7), the float support plate (7) is conical, and a liquid inlet hole (8) is provided at the center of the bottom end of the conical float support plate (7), the diameter of the liquid inlet hole (8) is smaller than the diameter of the float (4), the float (4) is placed on the float support plate (7) to block the liquid inlet hole (8), and a vent hole (6) is provided on the side wall of the air inlet cylinder (3) to communicate with the air flow channel, and the vent hole (6) is located above the float support plate (7). The anti-overflow device of the sewage suction truck has a wave-proof cylinder (1) added outside the air inlet cylinder (3) to prevent bubbles on the liquid surface from entering the air inlet cylinder (3), and the floating ball support plate (7) at the bottom of the air inlet cylinder (3) blocks the liquid inlet hole (8) by the gravity of the floating ball (4), thereby preventing bubbles from entering the air inlet cylinder (3) from the liquid inlet hole (8), but does not affect the sewage from entering the air inlet cylinder (3) from the liquid inlet hole (8). When the sewage is about to float the floating ball (4), the liquid level alarm starts to alarm, indicating that the rated capacity of the tank body of the sewage suction truck has been reached, and the vacuum pump stops suctioning. In this way, the sewage suction truck can suck the rated capacity of sewage without bubbles entering the vacuum pipe, thereby improving the working efficiency, protecting the vacuum pump from damage, and extending the service life of the vacuum pump.

[0012] The diameter of the liquid inlet hole (8) is 3 / 10 to 1 / 2 of the diameter of the float ball (4).

[0013] The air flow inlet at the upper end of the wave-breaking tube (1) is at least 200 mm higher than the alarm liquid level to ensure that when the alarm is triggered, the bubbles on the liquid surface have not risen to the air flow inlet of the wave-breaking tube (1), thereby preventing bubbles from entering the wave-breaking tube (1).

[0014] An outer flange (10) is provided on the outer periphery of the air inlet cylinder (3), an inner flange (9) is provided at the lower end of the wave-breaking cylinder (1), and the wave-breaking cylinder (1) is fixedly connected to the outer flange (10) of the air inlet cylinder (3) via the inner flange (9).

[0015] The air outlet pipe (2) is arranged in the mounting seat (5), the upstream end of the air outlet pipe (2) is located above the float, and the downstream end of the air outlet pipe (2) extends out of the mounting seat (5) and is used to connect to the air extraction pipe of the vacuum pump.

[0016] An upper cover is provided at the upper end of the mounting seat (5), and the downstream end of the air outlet pipe (2) extends out from the side wall of the mounting seat (5).

[0017] The diameter of the float (4) is larger than the aperture of the outlet pipe (2). The float (4) serves as the last barrier. If the vacuum pump does not stop working, the float (4) can block the outlet of the outlet pipe (2) to prevent sewage from entering the outlet pipe (2).

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is a partial cross-sectional view of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the air intake cylinder;

[0022] Figure 4 This is a schematic diagram of the air flow direction when the vacuum pump is working. DETAILED DESCRIPTION

[0023] An embodiment of the anti-overflow device of the sewage suction truck of the present invention:

[0024] See also Figure 1-Figure 4A sewage suction truck overflow prevention device comprises an air inlet cylinder (3) and an air outlet pipe (2), wherein the air inlet cylinder (3) is located below the air outlet pipe (2), a floating ball (4) is placed in the air inlet cylinder (3), a spacing is left between the floating ball (4) and the air outlet pipe (2), the upper end of the air inlet cylinder (3) is connected to a mounting seat (5), the air outlet pipe (2) is arranged in the mounting seat (5), the upstream end of the air outlet pipe (2) is located above the floating ball, and the downstream end of the air outlet pipe (2) extends out of the mounting seat (5) for connecting to the suction pipe of a vacuum pump. An upper cover (11) is arranged at the upper end of the mounting seat (5), and the downstream end of the air outlet pipe (2) extends from the side wall of the mounting seat (5). A wave-proof cylinder (1) is arranged outside the air inlet cylinder (3) for preventing liquid from entering. An inlet for airflow is reserved at the upper end of the wave-proof cylinder (1). An airflow passage is reserved between the side wall of the wave-proof cylinder (1) and the side wall of the air inlet cylinder (3). The lower end of the wave-proof cylinder (1) is fixedly connected to the outer periphery of the air inlet cylinder (3) to form a seal. An outer flange (10) is arranged on the outer periphery of the air inlet cylinder (3). An inner flange (9) is arranged at the lower end of the wave-proof cylinder (1). The wave-proof cylinder (1) is fixedly connected to the outer flange (10) of the air inlet cylinder (3) through the inner flange (9). The inner flange (9) and the outer flange (10) are fixedly connected by bolts. A concave float support plate (7) is arranged at the lower part of the air inlet cylinder (3). The float support plate (7) is conical. A liquid inlet hole (8) is arranged at the center of the bottom end of the conical float support plate (7). The diameter of the liquid inlet hole (8) is 3 / 10 to 1 / 2 of the diameter of the float (4). The float (4) is placed on the float support plate (7) to block the liquid inlet hole (8). The side wall of the air inlet cylinder (3) is provided with a vent hole (6) communicating with the air flow channel. The air inlet cylinder (3) in this embodiment is provided with four rectangular vent holes (6), and the vent holes (6) are located above the float support plate (7). The air flow inlet at the upper end of the wave-breaking cylinder (1) is at least 200 mm higher than the alarm liquid level to ensure that when the alarm is triggered, the bubbles on the liquid surface have not risen to the air flow inlet of the wave-breaking cylinder (1), thereby preventing bubbles from entering the wave-breaking cylinder (1). If there is a working condition where the bubble layer is thicker, the distance between the air flow inlet and the alarm liquid level is increased. The mounting seat (5) of the present embodiment is a cylindrical structure, the diameter of the cylinder is smaller than the diameter of the wave-proof cylinder (1), the lower end of the cylinder is provided with a mounting bracket, which is used to be fixedly connected to the mounting bracket provided at the upper end of the air inlet cylinder (3), the cylinder is welded to the tank body (12) of the sewage suction truck, and an upper cover (11) is provided at one end extending out of the tank body (12), and a clamping structure is also provided outside the upper cover (11). The diameter of the float (4) is larger than the aperture of the air outlet pipe (2), and the float (4) is used as the last checkpoint. In case the vacuum pump has not stopped working, the float (4) can block the outlet of the air outlet pipe (2) to prevent sewage from entering the air outlet pipe (2).The anti-overflow device of the sewage suction truck has a wave-proof cylinder (1) added outside the air inlet cylinder (3) to prevent bubbles on the liquid surface from entering the air inlet cylinder (3), and the floating ball support plate (7) at the bottom of the air inlet cylinder (3) blocks the liquid inlet hole (8) by the gravity of the floating ball (4), thereby preventing bubbles from entering the air inlet cylinder (3) from the liquid inlet hole (8), but does not affect the sewage from entering the air inlet cylinder (3) from the liquid inlet hole (8). When the sewage is about to float the floating ball (4), the liquid level alarm starts to alarm, indicating that the rated capacity of the tank body of the sewage suction truck has been reached, and the vacuum pump stops suctioning. In this way, the sewage suction truck can suck the rated capacity of sewage without bubbles entering the vacuum pipe, thereby improving the working efficiency, protecting the vacuum pump from damage, and extending the service life of the vacuum pump.

[0025] When the vacuum pump is working, the addition of the wave-breaking cylinder (1) changes the direction of the air flow, so that the air flow enters from the upper end of the wave-breaking cylinder (1), then goes downward to the vent hole (6) on the side wall of the air inlet cylinder (3), as shown in FIG. Figure 4 As shown, at this time, the sewage is slowly sucked into the tank of the sewage suction truck, and the liquid level gradually rises. The wave-breaking cylinder (1) blocks the bubbles on the liquid surface outside the air inlet cylinder (3). When the sewage is about to float the float (4), the liquid level alarm starts to alarm, indicating that the sewage has reached the rated capacity of the tank of the sewage suction truck, and then the vacuum pump stops sucking.

Claims

1. An anti-overflow device for a sewage suction truck, comprising an air inlet cylinder (3) and an air outlet pipe (2), wherein the air inlet cylinder (3) is located below the air outlet pipe (2), a floating ball (4) is placed in the air inlet cylinder (3), and a distance is left between the floating ball (4) and the air outlet pipe (2), characterized in that: The upper end of the air inlet cylinder (3) is connected to a mounting seat (5), and a wave-proof cylinder (1) for preventing liquid from entering is arranged outside the air inlet cylinder (3). An inlet for airflow is reserved at the upper end of the wave-proof cylinder (1), and an airflow channel is reserved between the side wall of the wave-proof cylinder (1) and the side wall of the air inlet cylinder (3). The lower end of the wave-proof cylinder (1) is fixedly connected to the outer periphery of the air inlet cylinder (3) to form a closure. A concave float support plate (7) is arranged at the lower part of the air inlet cylinder (3), and the float support plate (7) is conical. A liquid inlet hole (8) is arranged at the center of the bottom end of the conical float support plate (7). The diameter of the liquid inlet hole (8) is smaller than the diameter of the float (4). The float (4) is placed on the float support plate (7) to block the liquid inlet hole (8). A vent hole (6) is arranged on the side wall of the air inlet cylinder (3) to communicate with the airflow channel, and the vent hole (6) is located above the float support plate (7); The diameter of the liquid inlet hole (8) is 3 / 10 to 1 / 2 of the diameter of the float ball (4); The air flow inlet at the upper end of the wave-breaking tube (1) is at least 200 mm higher than the alarm liquid level; An outer flange (10) is provided on the outer periphery of the air intake cylinder (3); an inner flange (9) is provided at the lower end of the wave-breaking cylinder (1); and the wave-breaking cylinder (1) is fixedly connected to the outer flange (10) of the air intake cylinder (3) via the inner flange (9); The air outlet pipe (2) is arranged in the mounting seat (5), the upstream end of the air outlet pipe (2) is located above the float, and the downstream end of the air outlet pipe (2) extends out of the mounting seat (5) and is used to connect to the air extraction pipe of the vacuum pump; An upper cover (11) is provided at the upper end of the mounting seat (5), and a downstream end of the air outlet pipe (2) extends out from a side wall of the mounting seat (5).

2. The anti-overflow device for a sewage suction truck according to claim 1, characterized in that: The diameter of the float ball (4) is larger than the aperture of the air outlet pipe (2).

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