CN111114573B - Gravity blowdown mechanism of excrement collecting system for train and vacuum excrement collecting system - Google Patents

Abstract

The invention relates to a gravity sewage discharging mechanism of a excrement collecting system for a train and a vacuum excrement collecting system, which comprise a transfer box and a sewage box, wherein the transfer box is arranged above the sewage box, the transfer box is communicated with the sewage box through a communication port, a valve for controlling the on-off of the communication port is arranged at the communication port, the valve is a plug valve or a diaphragm valve, and the transfer box discharges sewage into the sewage box through gravity. The gravity sewage draining device has a simple integral structure, the caliber of a communication port can be not limited, and a plug valve or a diaphragm valve is used for replacing a slide valve in the prior art, so that gravity sewage draining is more stable and reliable, and maintenance cost is reduced.

Description

Gravity blowdown mechanism of excrement collecting system for train and vacuum excrement collecting system

Technical Field

The invention relates to a vacuum excrement collecting system for a train, in particular to a gravity sewage draining mechanism of the excrement collecting system for the train, and belongs to the technical field of railway vehicle manufacturing.

Background

In recent years, domestic high-speed rail cars and the like are all equipped with a vacuum excrement collecting system for collecting dirt and washing wastewater of a toilet, wherein the vacuum excrement collecting system with the largest equipment body amount is a transit type vacuum excrement collecting system. The transit type vacuum excrement collecting system has the characteristics of low energy consumption, short using waiting time of the excrement and urine, and the like. The relay type vacuum excrement collecting system has the defects of too many control parts, more fault points, low system cost performance and the like. Meanwhile, as the transit type vacuum excrement collecting system in the prior art adopts positive pressure to transfer dirt, reverse spraying failure can occur when the reliability of the components is reduced, and the use of the sanitary system is seriously affected.

In order to solve the above problems, a vacuum excrement collecting system for a train is disclosed in patent number 201822272624.5, wherein a transfer box is arranged above a sewage box, and the lower part of the transfer box is connected with the sewage box through a large-caliber discharge valve in a vacuum sewage suction gravity sewage discharge mode. However, the biggest difficulty of the system is that the large-caliber discharge valve, the currently commonly used slide valve and butterfly valve have the problems of small caliber, complex structure, inconvenient daily maintenance, poor reliability and the like, and can not be applied to a excrement collecting system which performs sewage discharge by means of gravity.

Disclosure of Invention

The invention mainly solves the technical problem of providing the gravity sewage draining mechanism of the excrement collecting system for the train, which has a simple structure and can greatly improve the working reliability, and simultaneously provides the vacuum excrement collecting system provided with the gravity sewage draining mechanism.

In order to achieve the above purpose, the technical scheme of the invention is as follows:

The utility model provides a gravity blowdown mechanism of excrement collecting system for train, includes transfer case and filth case, the top of filth case is arranged in to the transfer case, communicate through the intercommunication mouth between transfer case and the filth case the valve that is used for controlling the intercommunication mouth break-make is installed to intercommunication mouth department, the valve is plug valve or diaphragm valve, the transfer case passes through gravity and arranges filth to the filth incasement.

Further, the plug valve comprises a plug and a driving mechanism, wherein the output end of the driving mechanism is connected with the plug, the plug is driven by the driving mechanism to block the communication port to disconnect the communication port or separate from the communication port to open the communication port, and the driving mechanism is arranged outside the transfer box.

Further, a first opening is formed in the top plate of the transfer box, the driving mechanism is fixed on the top plate at the first opening through a first sealing and fixing structure, the output end of the driving mechanism penetrates through the opening to be connected with the valve plug, and the valve plug moves in the transfer box;

Or be provided with the second opening on the roof of transfer case, be provided with confined valve plug chamber in second open-ended top, the valve plug stretches into the transfer incasement portion when the shutoff state, upwards remove the accommodation in the valve plug intracavity when the open state, actuating mechanism fixes on the casing in valve plug chamber, the valve plug chamber passes through the roof fixed connection of second seal fixed knot constructs with the transfer case.

Further, a cylindrical guide cylinder extends out of the first opening or the second opening towards the interior of the transfer box, the valve plug moves linearly in the guide cylinder, and at least part of the height of the guide cylinder is located in the guide cylinder when the valve plug is in a blocking state.

Further, the first opening, the second opening or the guide cylinder is matched with the valve plug in size, and the inner ring of the first opening or the second opening and/or the cylinder wall of the guide cylinder are/is contacted with the outer peripheral surface of the valve plug when moving;

or the size of the first opening or the second opening and/or the guide cylinder is slightly larger than that of the valve plug, and a flexible scraping blade is arranged on the wall of the first opening, the second opening or the guide cylinder and is in contact with the outer peripheral surface of the valve plug when moving.

Further, the method comprises the steps of, when the valve plug is in a blocking state, the bottom plane of the valve plug is positioned below the communication port.

Further, the diaphragm valve comprises a diaphragm and a valve body, the valve body is of a cylindrical structure extending to the inner direction of the dirt box at the communication port, the bottom surface of the valve body is a conical surface with a certain inclination angle, the diaphragm is installed on the bottom surface of the valve body, the diaphragm is connected with one end of the valve body, which is high in position, through a fixed point, and the diaphragm is made of a material with certain forming hardness, so that the diaphragm can sufficiently seal the valve body in a non-pressure or negative pressure state and can deform to open the valve body in a pressed state.

Further, the inclination angle of the diaphragm in the blocking state is 20-70 degrees.

Further, the transfer box is a box-shaped structure formed by a bottom plate, a top plate and a coaming, the bottom plate of the transfer box is of a conical structure protruding downwards, the communication port is arranged at the bottommost end of the conical structure, the top plate is integrally of a flat plate-shaped structure, and the top plate is one of a round shape, a square shape, a semicircular shape, an elliptic shape and a fan shape.

Further, the top plate has a downwardly recessed portion, and the driving mechanism is mounted on the top plate of the recessed portion.

The other technical scheme of the invention is as follows:

A vacuum excrement collecting system for a train, comprising a sewage and waste water discharging device, a transfer box, a sewage box and a vacuum generator 18, wherein the sewage and waste water discharging device is connected with the transfer box through a sewage discharge pipe, the vacuum generator 18 is connected with the transfer box through an air pipe, and a gravity sewage discharge mechanism as claimed in any one of claims 1-9 is arranged between the transfer box and the sewage box.

In summary, the gravity pollution discharge mechanism and the vacuum excrement collecting system of the excrement collecting system for the train have the following advantages compared with the prior art:

(1) The gravity drainage mechanism has simple integral structure, can not limit the caliber of the communication port, and replaces a sliding plate valve in the prior art by a plug valve or a diaphragm valve, so that gravity drainage is more stable and reliable, and maintenance cost is reduced.

(2) The gravity pollution discharge mechanism scrapes off dirt on the valve plug when the valve plug moves by utilizing an opening formed in the top plate of the middle rotating box or the wall of the valve plug guide cylinder or a scraping blade arranged at the opening or on the guide cylinder, plays a self-cleaning role on the valve plug, and is beneficial to further reducing daily maintenance cost.

(3) The gravity sewage draining mechanism adopts the diaphragm valve to control the on-off of the communication port, so that the structure can be further simplified, the sewage draining mechanism can still be used under the condition of no air and no electricity, and the peculiar smell in the sewage box can be prevented from entering the carriage.

(4) The transfer box in the gravity sewage draining mechanism can select any shape structure according to actual installation requirements, and the universality of the sewage draining mechanism is improved.

(5) In the gravity sewage draining mechanism, the transfer box is directly connected with the sewage box, so that structures such as a sewage draining valve arranged between the transfer box and the sewage box in the prior art are omitted, and the total height occupied by the transfer box and the sewage box is reduced.

Drawings

FIG. 1 is a schematic view of a sewage draining mechanism (closed state) according to an embodiment of the present invention;

FIG. 2 is a schematic view of a sewage draining mechanism (sewage draining state) according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a second embodiment of the present invention;

FIG. 4 is a schematic view of a third embodiment of the present invention (closed state);

FIG. 5 is a schematic view of a third embodiment of the present invention (blowdown state);

FIG. 6 is a schematic view of a fifth embodiment of the present invention (closed state);

As shown in fig. 1 to 6, the transfer box 1, the bottom plate 1a, the top plate 1b, the coaming 1c, the dirt box 2, the top plate 2a, the communication port 3, the frustum-shaped structure 3a, the valve 4, the driving mechanism 5, the valve plug 6, the frustum-shaped structure 6a, the first opening 7, the cover plate 8, the guide cylinder 9, the concave portion 10, the second opening 11, the valve plug cavity 12, the fixing seat 13, the diaphragm 14, the valve body 15, the fixing point 16, the toilet 17, the vacuum generator 18, the toilet drain valve 19, and the access door 20.

Detailed Description

The invention is described in further detail below with reference to the attached drawings and detailed description:

embodiment one:

As shown in fig. 1 and 2, the gravity sewage draining mechanism of the excrement collecting system for the train provided in this embodiment comprises a transfer box 1 and a sewage box 2, wherein the transfer box 1 is arranged above the sewage box 2, a bottom plate 1a of the transfer box 1 is communicated with a top plate 2a of the sewage box 2 through a communication port 3, a valve 4 for controlling the on-off of the communication port 3 is arranged at the communication port 3, and sewage, waste water and the like entering the transfer box 1 are discharged into the sewage box 2 below through the action of gravity.

The communication port 3 is formed by abutting an opening formed in the bottom plate 1a of the transfer box 1 and an opening formed in the top plate 2a of the dirt box 2, and the transfer box 1 and the dirt box 2 are fixedly connected together at the corresponding openings through fastening devices such as flanges, so that daily maintenance and overhaul are facilitated. In order to ensure the tightness of the communication port 3, a circle of sealing rings (not shown in the figure) are arranged at the opening where the transfer box 1 is in butt joint with the sewage box 2. The transfer box 1 is directly connected with the sewage box 2, so that the structures such as a blow-off valve and the like arranged between the transfer box 1 and the sewage box 2 in the prior art are omitted, and the total height occupied by the transfer box 1 and the sewage box 2 is reduced. Because the transfer box 1 is arranged on the sewage box 2, a plurality of toilets and wastewater collection of a train can share the same transfer box 1 for collection, parts are saved, and the high-efficiency use and low energy consumption of the toilet 17 are realized.

As shown in fig. 1 and 2, the transfer box 1 is a box-shaped structure composed of a bottom plate 1a, a top plate 1b and a coaming 1c, the top plate 1b of the transfer box 1 is a flat plate structure, the top plate 1b can be one of a circle, a square, a semicircle, an ellipse and a fan, and one of the transfer box 1 structures can be selected according to the actual installation space. Of course, the transfer box 1 can also adopt other special-shaped structures. The end of the sewage drain pipe of the toilet 17 is connected to the coaming 1c of the transfer box 1, the water drain pipe of the waste water box is also connected to the coaming 1c of the transfer box 1, and the end of the exhaust pipe of the vacuum generator 18 is connected to the top plate 1b of the transfer box 1. An access door (not shown in the figure) for servicing the transfer box 1 is provided on the coaming 1 c.

The bottom plate 1a of transfer case 1 is downward convex toper structure, and the intercommunication mouth 3 sets up in toper structure bottom position, and this structure is favorable to making the filth that gets into in the transfer case 1 flow to the intercommunication mouth 3 department at bottom center, and then is favorable to making the filth in the transfer case 1 discharge to the filth case 2 of below in whole through the action of gravity.

In this embodiment, the valve 4 is preferably a plug valve, which includes a driving mechanism 5 and a plug 6, where an output end of the driving mechanism 5 is connected to the plug 6, and a movement direction of the plug 6 is perpendicular to a plane in which the communication port 3 is located. The connection between the output end of the driving mechanism 5 and the valve plug 6 can be flange connection or screw connection, so as to facilitate daily maintenance. The valve plug 6 is driven by the driving mechanism 5 to block the communication port 3 to disconnect the communication port 3 when the transfer box 1 sucks sewage in vacuum, or to disconnect the communication port 3 to open the communication port 3 when the transfer box 1 discharges sewage to the sewage box 2.

The driving mechanism 5 can adopt an air cylinder, a hydraulic cylinder or a motor and the like, and can drive the valve plug 6 to do linear motion, and the driving mechanism 5 is arranged outside the transfer box 1.

The roof 1b of the transfer box 1 is provided with a first opening 7, the driving mechanism 5 is fixed on the roof 1b at the first opening 7 through a first sealing and fixing structure, in this embodiment, the first sealing and fixing structure preferably adopts a cover plate 8, the diameter of the cover plate 8 is larger than that of the first opening 7, the cover plate 8 is fixedly mounted on the roof 1b through bolts, the driving mechanism 5 is fixedly mounted on the cover plate 8, and the output end of the driving mechanism 5 passes through the cover plate 8 and the first opening 7 to be fixedly connected with the valve plug 6. In order to ensure tightness at the first opening 7, a ring of sealing gasket (not shown in the figure) is arranged between the cover plate 8 and the top plate 1b, so that leakage is prevented when the transfer box 1 is vacuumized.

In this embodiment, whether in the blocking state or in the open state, the valve plug 6 moves in the transfer box 1, the diameter of the first opening 7 may be matched with the diameter of the output end of the driving mechanism 5, which is far smaller than the diameter of the valve plug 6, and the valve plug 6 may be subjected to routine maintenance through an access door on one side. In this embodiment, in order to facilitate routine maintenance and repair of the valve plug 6, it is preferable that the diameter of the first opening 7 is matched with the diameter of the valve plug 6, so that the valve plug 6 can be taken out from the first opening 7 only by opening the cover plate 8 above during maintenance and repair.

In order to ensure that the movement of the valve plug 6 is smoother, in this embodiment, it is more preferable that a cylindrical guide cylinder 9 extends toward the interior of the transfer box 1 at the first opening 7, the inner diameter of the guide cylinder 9 is the same as the inner diameter of the first opening 7, and is an equal diameter cylinder, and the valve plug 6 moves linearly in the guide cylinder 9. The height of the guide cylinder 9 at least ensures that the valve plug 6 remains partially positioned in the guide cylinder 9 in the plugged state.

When the diameter of the first opening 7 is matched with the diameter of the valve plug 6, the outer peripheral surface of the valve plug 6 contacts with the inner ring of the first opening 7 or the cylinder wall of the guide cylinder 9 when moving, when the valve plug 6 moves upwards, dirt adhered to the valve plug 6 can be scraped by the cylinder wall of the guide cylinder 9, and falls into the transfer box 1, so that the valve plug 6 has a self-cleaning function, and the daily maintenance cost is further reduced.

The valve plug 6 can be made of metal materials, hard rubber, nylon, plastics and other materials. The bottom of the valve plug 6 is in a frustum-shaped structure 6a converging towards the center, and the communication port 3 is matched with the bottom of the valve plug 6 to form a frustum-shaped structure 3a with a large upper part and a small lower part, so that the sealing performance during plugging is ensured. For convenience of manufacture, the top plate 2a of the dirt box 2 has a flat-mouth structure at the opening, and the transfer box 1 has a frustum-shaped structure 3a protruding toward the dirt box 2 at the opening.

The valve plug 6 is located the below of intercommunication mouth 3 in the shutoff state its bottom plane for when the valve plug 6 removes to the direction of intercommunication mouth 3, can push away the filth that glues in intercommunication mouth 3 department to the filth case 2 of below in, guarantee reliable seal when shutoff state.

The sewage disposal mechanism can complete the connection or disconnection of the communication port 3 through the simple up-down linear motion of the valve plug 6, has simple overall structure and simple control, can not limit the caliber of the communication port 3, replaces a slide valve in the prior art with the valve plug, can not only enable gravity sewage disposal to be more stable and reliable, but also is beneficial to reducing maintenance cost.

The embodiment also provides a vacuum excrement collecting system for a train, which comprises sewage and wastewater discharge equipment, a transfer box 1, a sewage box 2, a wastewater tank, a vacuum generator 18, a pneumatic control unit, an electric control unit, a water pressurizing unit, a flushing button and the like, wherein the sewage and wastewater discharge equipment comprises an excrement collector 17, a wash basin, a floor drain and the like, the excrement collector 17 is connected with the transfer box 1 through a drain pipe, a excrement collector drain valve 19 is arranged on the drain pipe, the wash basin, the floor drain and the like are connected with the wastewater box through drain pipes, the wastewater box is connected with the transfer box 1 through drain pipes, the vacuum generator 18 is connected with the transfer box 1 through air pipes, the gravity sewage discharging mechanism as described above is arranged between the transfer box 1 and the sewage box 2, and a driving mechanism 5 is connected with an electric control unit or a pneumatic control unit in the excrement collecting system.

The plug valve is normally in a closed state, when a passenger uses the toilet 17, the vacuum generator 18 works to vacuumize the transfer box1, when the vacuum degree reaches a set value of the vacuum switch, the vacuum generator 18 stops working, the toilet drain valve 19 is opened, dirt is pumped into the transfer box1 under the action of negative pressure, the toilet drain valve 19 is closed, the control valve plug 6 moves upwards to open the communication port 3, and the dirt in the transfer box1 is discharged into the dirt box 2 under the gravity. The sewage transfer process in the transfer box1 is completely free from positive pressure by using gravity sewage discharge, so that the problem that the toilet 17 is reversely sprayed when the parts of the original transfer box1 with the same low energy consumption are failed due to the adoption of positive pressure for transferring the sewage is solved.

The structure and the working principle of the vacuum excrement collecting system are the same as those of the prior art, and are not described in detail here.

Embodiment two:

As shown in fig. 3, the top plate 1b of the rotating box 1 has a flat plate structure, and the top plate 1b may have one of a circular shape, a square shape, a semicircular shape, an elliptical shape, and a fan shape, and the top plate 1b shown in fig. 3 has a semicircular structure, which is different from the first embodiment in that in the present embodiment, a downward concave portion is provided on the top plate 1b, the position of the concave portion 10 is not limited, and the driving mechanism 5 is mounted on the top plate 1b in the concave portion 10 as long as it is disposed opposite to the communication port 3. Providing the recessed portion 10 on the top plate 1b is advantageous in further reducing the installation height of the driving mechanism 5 while ensuring the capacity of the transfer box 1, and in shortening the stroke of the valve plug 6.

The bottom plate 1a of the transfer box 1 is also of a conical structure protruding downwards, and the communication port 3 is arranged at the center position of the bottommost part of the conical structure. An access door 20 for servicing the transfer box 1 is provided on the coaming 1 c.

Embodiment III:

As shown in fig. 4 and 5, in the present embodiment, a second opening 11 is provided in the top plate 1b of the transfer box 1, a closed valve plug cavity 12 is provided above the second opening 11, and the valve plug 6 extends into the interior of the transfer box 1 in the blocking state, and is accommodated in the valve plug cavity 12 in an upward moving manner in the open state, which is different from the first embodiment or the second embodiment. The driving mechanism 5 is fixed on the shell of the valve plug cavity 12, the valve plug cavity 12 is fixedly connected with the top plate 1b of the transfer box 1 through a second sealing and fixing structure, the second sealing and fixing structure is an annular fixing seat 13, and a sealing ring is arranged between the fixing seat 13 and the top plate 1b to realize sealing connection.

In this structure, the diameter of second opening 11 matches with the diameter of valve plug 6, and the peripheral surface of valve plug 6 contacts with the inner circle of second opening 11 when removing, when valve plug 6 upwards removes, can utilize the inner circle of second opening 11 to scrape the filth of adhesion on the valve plug 6, and the filth drops in transfer case 1, plays the effect of self-cleaning to valve plug 6, is favorable to further reducing daily maintenance cost.

Embodiment four:

The difference from the first, second and third embodiments is that the diameters of the guide cylinder 9 and the second opening 11 are slightly larger than the diameter of the valve plug 6, and flexible wiper blades (not shown) are disposed on the cylinder wall of the guide cylinder 9 or on the second opening 11, and the flexible wiper blades may be uniformly disposed in a plurality of circumferential directions or may be disposed in a ring shape. The flexible doctor blade contacts with the outer peripheral surface of the valve plug 6 when moving, and dirt adhered to the valve plug 6 is scraped by the flexible doctor blade and falls into the transfer box 1, so that the valve plug 6 is self-cleaned.

Fifth embodiment:

Under special conditions such as vehicle faults, passengers are trapped in a train carriage temporarily, and under the worse conditions, the train is powered off and disconnected, so that the vacuum toilet for the toilet cannot work, and in order to solve the emergency available problem of the toilet 17 under the special conditions, the difficulty in using the toilet for temporarily trapping passengers is relieved, and as shown in fig. 6, in the embodiment, a valve for controlling the on-off of the communication port 3 between the transfer box 1 and the sewage box 2 adopts a membrane valve with simpler structure and control.

The diaphragm valve comprises a diaphragm 14 and a valve body 15, wherein the valve body 15 is of a cylindrical structure extending to the inner direction of the dirt box 2 at the communication port 3, the bottom surface of the valve body 15 is a conical surface with a certain inclination angle, the diaphragm 14 is arranged on the bottom surface of the valve body 15, and the diaphragm 14 is connected with one end of the valve body 15, which is positioned at a high position, through a fixed point 16. In the present embodiment, preferably, the bottom of the valve body 15 is inclined downward from the position of the communication port 3, and the fixing point of the diaphragm 14 is provided on the ceiling 2a of the dirt box 2 at the communication port 3.

The diaphragm 14 is made of a material with certain forming hardness, the material has certain elasticity at the same time, when no sewage is discharged, the diaphragm 14 can block the valve body 15 by means of the hardness of the material, so that the communication port 3 is blocked, when sewage enters the transfer box 1, the sewage firstly enters the valve body 15, at the moment, the weight of the sewage can enable the diaphragm 14 to be deformed under pressure and incline downwards, so that the communication port 3 is opened, the sewage enters the sewage box 2, after the sewage is discharged, the good weight disappears, and the diaphragm 14 automatically returns to the blocking state. Depending on the material chosen for the membrane 14, the membrane 14 preferably has an inclination in the closed state of between 20 and 70 °, more preferably between 30 and 45 °.

The vacuum excrement collecting system for the train is also provided in the implementation, and the structure and the working principle of the vacuum excrement collecting system are the same, so that detailed description is omitted.

In this embodiment, the toilet drain valve 19 is a pinch valve, when the vehicle is running normally, the pinch valve of the toilet 17 is in a closed state, when the passenger uses the toilet 17, the vacuum generator 18 works to vacuumize the transfer box 1, at this time, the diaphragm 14 of the diaphragm valve at the communication port 3 of the transfer box 1 is subjected to negative pressure and is adsorbed on the conical valve body 15 to form a seal, when the vacuum degree reaches the set value of the vacuum switch, the vacuum generator 18 stops working, the pinch valve is opened, dirt is pumped into the transfer box 1 under the action of the negative pressure, the pinch valve is closed, and the diaphragm 14 of the diaphragm valve is pressed by the dirt under the action of gravity to fall into the dirt box 2.

When the train is in an electroless and airless condition, the pipe clamp valve is automatically in an open state under the airless condition, and when a passenger uses the toilet 17, dirt flows into the transfer box 1 along the open pipe clamp valve, the dirt in the transfer box 1 flows into the diaphragm valve below through the conical structure at the bottom of the transfer box 1, and the diaphragm 14 of the diaphragm valve is pressed under the action of gravity to fall into the dirt box 2. The emergency use of passengers under the non-pneumatic and non-electric conditions is solved, the diaphragm 14 of the diaphragm valve is sealed by the diaphragm forming hardness and the conical valve body at ordinary times, the peculiar smell in the dirt box 2 can be effectively prevented from entering the carriage, and the environmental comfort in the carriage is ensured to a certain extent.

As mentioned above, similar technical solutions can be derived from the solution content presented in connection with the figures. However, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.

Claims (6)

1. The utility model provides a gravity blowdown mechanism of collection just system for train, includes transfer case and filth case, the top of filth case is arranged in to the transfer case, its characterized in that: the transfer box is communicated with the sewage box through a communication port, a valve for controlling the on-off of the communication port is arranged at the communication port, the valve is a plug valve or a diaphragm valve, and the transfer box discharges sewage into the sewage box through gravity;

The plug valve comprises a plug and a driving mechanism, wherein the output end of the driving mechanism is connected with the plug, the plug is driven by the driving mechanism to block the communication port to disconnect the communication port or separate from the communication port to open the communication port, and the driving mechanism is arranged outside the transfer box;

The top plate of the transfer box is provided with a first opening, the driving mechanism is fixed on the top plate at the first opening through a first sealing and fixing structure, the output end of the driving mechanism penetrates through the opening to be connected with the valve plug, and the valve plug moves in the transfer box; or, a second opening is formed in the top plate of the transfer box, a closed valve plug cavity is formed above the second opening, the valve plug stretches into the transfer box in a blocking state, and is upwards moved and accommodated in the valve plug cavity in an opening state, the driving mechanism is fixed on the shell of the valve plug cavity, and the valve plug cavity is fixedly connected with the top plate of the transfer box through a second sealing and fixing structure;

A cylindrical guide cylinder extends from the first opening or the second opening to the interior of the transfer box, the valve plug moves linearly in the guide cylinder, and the height of the guide cylinder at least ensures that at least part of the valve plug is positioned in the guide cylinder in a blocking state;

The first opening, the second opening or the guide cylinder is matched with the valve plug in size, and the inner ring of the first opening or the second opening and/or the cylinder wall of the guide cylinder are/is contacted with the outer peripheral surface of the valve plug when moving; or the size of the first opening or the second opening and/or the guide cylinder is slightly larger than that of the valve plug, and a flexible scraping blade is arranged on the wall of the first opening, the second opening or the guide cylinder and is in contact with the outer peripheral surface of the valve plug when moving;

The diaphragm valve comprises a diaphragm and a valve body, the valve body is of a cylindrical structure extending to the inner direction of the dirt box at the communication port, the bottom surface of the valve body is a conical surface with a certain inclination angle, the diaphragm is installed on the bottom surface of the valve body, the diaphragm is connected with one end of the valve body, which is high in position, through a fixed point, and the diaphragm is made of a material with certain forming hardness, so that the diaphragm can sufficiently seal the valve body in a non-pressure or negative pressure state and can deform to open the valve body in a pressed state.

2. The gravity drainage mechanism of a urine collection system for a train according to claim 1, wherein: when the valve plug is in a blocking state, the bottom plane of the valve plug is positioned below the communication port.

3. The gravity drainage mechanism of a urine collection system for a train according to claim 1, wherein: the inclination angle of the diaphragm in the blocking state is 20-70 degrees.

4. A gravity drainage mechanism of a urine collection system for a train according to any one of claims 1 to 3, wherein: the transfer box is a box-shaped structure formed by a bottom plate, a top plate and coamings, the bottom plate of the transfer box is of a conical structure protruding downwards, the communication port is arranged at the bottommost end of the conical structure, the top plate is integrally of a flat plate-shaped structure, and the top plate is one of a round shape, a square shape, a semicircular shape, an oval shape and a fan shape.

5. The gravity drainage mechanism of a urine collection system for a train according to claim 4, wherein: the top plate has a downwardly recessed portion, and the drive mechanism is mounted on the top plate of the recessed portion.

6. The utility model provides a collection just system for train, includes filth and waste water discharging equipment, transfer case, filth case and vacuum generator, and filth and waste water discharging equipment pass through the blow off pipe and are connected with the transfer case, and vacuum generator passes through the trachea and is connected with the transfer case, its characterized in that: a gravity drainage mechanism as claimed in any one of claims 1 to 5 mounted between the transfer box and the waste box.