Patent Publication Number: US-2011056008-A1

Title: Waste Water Tank of a Portable Multifunctional Toilet Having a Liquid Level Display Structure and an Exhaust Valve

Description:
FIELD OF THE INVENTION  
     The utility model relates to a relatively airtight container which is provided with an inductive liquid level display structure and is mounted with a self-sealing exhaust valve device, more particularly to a waste water tank of a portable flushing toilet, the waste water tank is provided with an inductive liquid level display structure and an exhaust valve device to form a portable multifunctional flushing toilet. The utility model belongs to the field of environmental health. 
     BACKGROUND OF THE INVENTION  
     The portable flushing toilet is widely applicable to such fields as outdoors, nursing care and vehicle mounting. Although there are quite a number of patents relating to the portable flushing toilet, no more feasible technical solutions of how to determine the amount of content in the waste water tank are available. The Chinese patent 200720183864.7 relates to the similar problem, but does not provide a complete implementation solution, thereby not being capable of solving the problem of how to be reliably mounted with the container itself as well as the problems of the reliable sealing of the container itself, and the reliable operation. A feasible solution relating to the exhaust valve structure of the like container is also not available, so that the pressure generated by filth in the waste water tank cannot be discharged, and the filth swashes outwards when the valve is opened, which is very unsanitary. 
     SUMMARY OF THE INVENTION  
     The present utility model successfully realizes that a complicated buoyant support structure is reliably mounted in a small-opening container and then the container is reliably sealed. A display mechanism is mounted on the upper edge of the container, and the height of the filth inside the container is displayed by means of magnetic force induction so as to achieve the effect that the amount of the content is determined without directly observing the filth. Meanwhile, the present utility model successfully and reliably realizes that the gas pressure generated by the filth is released through the exhaust valve, thereby being capable of easily reaching an ordinary pressure and preventing filth from swashing, so as to use the waste water tank more safely, sanitarily and cleanly. 
     The technical solution is as follows: 
     The rising and falling of the buoyant on the buoyant support in the container are converted into the rotational motion of the support so as to rotate the magnet mounted at the other end of the support for radiating magnetic force through a tank body outwardly, 
     A magnet mutually induced with the magnet on the internal support is mounted on a cone wheel of the display structure component at the edge of the container so as to be rotated with the magnet on the support. A balancing weight is mounted at a position symmetrical from the magnet mounted on the cone wheel so as to guarantee a balancing and sensitive motion of the cone wheel. A scale mark on the cone wheel clearly shows the level of the content similar to a needle pointer of a meter. 
     The plane position of the induction display structure with rising and falling buoyant in the waste water tank is designed to be the position where the induction display structure can not be touched by a linear article such as a brush that is stretched into the container from its opening, as shown in  FIG. 3 , while the spatial position of the induction display structure is designed at an angle of 45 degrees with respect to the contour of the container, which angle being the best angle for observation from the upper part, as shown in  FIG. 5 . 
     The buoyant support is placed into an axle seat hole reserved in the container through an outlet of the container, and is sealed and fixed by a sealing plug integrated with an sealing ring, a cylindrical sealing plug, an inner-pentagon irregular-shaped screwing-down structure and an anti-loosing structure with a ratchet wheel, as shown in  FIG. 2 . 
     An outer cover of a transparent window is provided outside the cone wheel for display, for protecting the reliable operation of the mechanism. A corresponding liquid level height schematic is inscribed thereon. The scale mark on the cone wheel, the green region at the left of the scale mark, the red region at the right of the scale mark, and the liquid level schematic on the cover constitute a combined display, for convenient and clear use by different people, as shown in  FIG. 6 . 
     By screwing the exhaust valve at a corresponding position in the tank body, a sealing plate, a spring and the sealing ring are mounted at appropriate positions at the same time, and a non-return structure is brought into use and is sealed automatically. A button is encased from the outside and the outer cover is fixed, and the assembly is finished. When the button is pushed, air is discharged rapidly and immediately so that the gas pressure inside the tank returns to normal, as shown in  FIG. 7 . 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS  
         FIG. 1  is a schematic illustrating the final assembly of the liquid level display embodiment of the utility model. 
         FIG. 2  is a schematic illustrating the assembly operation of the liquid level display embodiment of the utility model. 
         FIG. 3  is a schematic illustrating the plane position of the liquid level display and the exhaust valve of the utility model. 
         FIG. 4  is a schematic illustrating a liquid level display sealing plug and a non-return structure with a ratchet wheel. 
         FIG. 5  is a side sectional schematic of the liquid level display of the utility model. 
         FIG. 6  is a front schematic of the liquid level display part of the utility model. 
         FIG. 7  is a side sectional schematic of the exhaust valve of the utility model. 
         FIG. 8  is a schematic illustrating the final assembly of the exhaust valve of the utility model. 
         FIG. 9  is a schematic illustrating the assembly operation of the exhaust valve embodiment of the utility model. 
         FIG. 10  is a schematic illustrating a sealing plug of the exhaust valve and a non-return structure with a ratchet wheel. 
     
    
    
     SPECIFIC EMBODIMENTS  
     A waste water tank  1  of a portable flushing toilet is shown in  FIG. 1 . At the same time of molding the tank body of the waste water tank  1 , axle seat  1 - 31  of support shafts, a threaded hole  1 - 3  of a sealing plug, an axle seat  1 - 21  of a cone wheel and an cone wheel mounting recess  1 - 2  are molded. Meanwhile,  FIG. 1  clearly indicates that the liquid level display mechanism is mounted on the contour of the waste water tank.  FIG. 5  clearly indicates the position of the liquid level display mechanism on the plan view of the waste water tank, the liquid level display mechanism being mounted at the top left corner region shown by dash line  10 - 1 , where the liquid level display mechanism can not be touched by a long and straight article such as a brush stretched into the waste water tank  1  from the outlet  10  of the tank  1 . The aim is that the internal structure could not be damaged easily during cleaning. An exhaust valve mounting hole  1 - 5  is located at a front position at the same side, as shown in  FIG. 5 . 
     As shown in  FIG. 1 , the buoyant is mounted at a actuation part  3 - 6  of the buoyant support causing the support to rise and fall, and the support  3  is mounted into the threaded hole  1 - 3  of the sealing plug and the axle seat of support shafts  1 - 31  from the outlet  10  of the waste water tank  1 . 
     As shown in  FIG. 3 , the hole for the sealing plug  4  and ratchet wheel  1 - 4  are one through hole formed by secondarily processing a molding product, for making the support shafts enter conveniently and making the tank body communicate with the outside conveniently. 
     As shown in  FIG. 2 , after the support  3  is mounted at an appropriate position, the sealing ring  5  is placed inside, the sealing plug  4  is subsequently screwed into the appropriate position, and a positioning pin  4 - 1  inside the support stretches between the support shafts, so that the support shafts are permitted to rotate without falling off. 
     As shown in  FIG. 4 , the screwing-in structure of the sealing plug is non-standard inner-pentagon structure, with the purpose of avoiding using a common tool to screw the sealing plug off. To prevent the threaded part from loosening and influencing the tightness, the utility model is additionally provided with an anti-loosing ratchet wheel structure. The ratchet wheel  1 - 4  can be screwed down only clockwise to press the sealing ring without the possibility of leakage due to loosing. 
     As shown in  FIG. 2 , the support  3 , the sealing ring  5  and the sealing plug  4  are mounted at appropriate positions to form a fully-sealed structure. The content inside the waste water tank does not leak out, saying nothing of being seen. 
     The cone wheel  2  is mounted into the recess  1 - 2  pre-molded on the waste water tank  1 . The triangle shape of the cone naturally limits the mounting direction nonreversible, and avoids the occurrence of mounting error. 
     The rising and falling of the actuation part  3 - 6  of the support causes a rotational motion of the support about the support shafts  3 - 1 , and drives the integrated magnet  3 - 2  to rotate. The magnetic force permeates the wall of the waste water tank through radiation, and the magnet  2 - 2  on the cone wheel  2  is induced and attracted, causing the synchronous rotation of the cone wheel, thereby realizing the function of displaying the height of the content in the waste water tank. 
     To make the cone wheel move sensitively and freely, a balancing weight  2 - 3  with the same weight as the magnet is additionally mounted at a symmetrical position with the magnet on the cone wheel taking the axle as the center. 
     As shown in  FIG. 1 , after the cone wheel  2  and the sealing plug  4  are mounted to the waste water tank  1 , in order to make the cone wheel normally and stably operate, an outer cover  6  is additionally mounted; meanwhile, a transparent window  7  is reserved, and both the outer cover and the transparent window are mounted at the waste water tank  1  sequentially by means of elastic clamp. After transparent window  7  is mounted at an appropriate position, a plane  7 - 1  presses a cone wheel shaft  2 - 1  in the axle seat  1 - 31  so that the cone wheel  2  can only rotate about its shaft  2 - 1 . 
     As shown in  FIG. 5 , the transparent window  7  on the contour position of the waste water tank displays in a direction of an angle of 45 degrees, with the purpose of ensuring that a person can look down the transparent window more conveniently and accurately when standing. 
     As shown in  FIG. 6 , three marks of the portable flushing toilet are inscribed at the upper part of the transparent window from left to right, wherein the left mark represents the state of not full, the middle mark represents half full, and the right mark represents full. 
     There is an upward white arrow  8  on the cone wheel at the part visible from the transparent window, the region at the right side of the arrow in green and the region at the left side of the arrow in red. When the waste water tank is not full, the arrow is at the left side, the arrow and only the green region are visible from the transparent window. When the waste water tank is half full, the arrow points to the middle part, with the right half part in green and the left half part in red. When the waste water tank is full, the arrow points to the right part, and only the red region is visible from the window. The liquid level of the content is displayed comprehensively, intuitively, iconically and in multi-level by the arrow, with the display manner of the toilet simulation schematic ( FIG. 9 ) and schematic colors of red and green complying with the international tradition, so that the display is widely suitable for persons in different countries and regions with different culture backgrounds to use it correctly. 
     As shown in  FIGS. 7-10 , a threaded hole  1 - 5  of the exhaust valve is preformed on the tank body  1 . A sealing valve plug  15  provided with a sealing ring  15 - 1 , a spring  15 - 2  and a sealing plate  15 - 3  consisting of a soft material and a hard material is screwed in. After the sealing valve plug  15  is mounted at an appropriate position, loosing is effectively prevented by the non-return structure with a ratchet wheel. The spring  15 - 2  is compressed to form an expansionary force so that the sealing plate  15 - 3  and the operation surface of the sealing valve plug  15  are sealed and do not cause leakage. A button  16  is inserted into the sealing plate  15 - 3 , and a button cover  17  is fixed and the assembly is finished. In operation, when the button is pushed downwards and the sealing plate  15 - 3  leaves the sealing surface, the inner space of the tank body is communicated with the outside, and the inner gas pressure reducing to be in a normal state.