Abstract:
The invention discloses an integrated SCR reducing agent storage device. The integrated SCR includes a liquid storage box and a metering injection unit, the liquid storage box is used for storing reducing agent, the metering injection unit is integrated with the liquid storage box, the metering injection unit at least includes a pump body, and a membrane pump, a filter, a metering valve and a control unit all arranged on the pump body, and the metering injection unit is integrally arranged on the liquid storage box to inject the reducing agent under the control of the control unit, thus avoiding the use of pipes for suction, reflux and heating and of relevant pipe joints and decreasing the leakage risk of the reducing agent, meanwhile, the metering injection device is compact in structure, good is pressure stabilizing effect and accurate in control for injection of the reducing agent.

Description:
TECHNICAL FIELD 
       [0001]    The invention relates to a reducing agent storage and injection control device in a diesel exhaust treatment purification system, in particular to a reducing agent storage device in an integrated SCR (Selective Catalyst Reaction) system. 
       BACKGROUND 
       [0002]    With the increasing social requirement on environmental protection, our country has put more and more efforts into environmental protection and appropriate polices regarding vehicle emission have been put forward by relevant national departments, and especially, introduction of ‘National Standard IV’ results in more stringent control for vehicle emission, which means that the standard can be met only after 30%-50% of pollutant is reduced on the basis of ‘National Standard IV’, and ‘National Standard IV’ will come into force nationwide on 2012 in accordance with normal standard implementation procedure. 
         [0003]    Now, it is acknowledged that the technology of selective catalytic reduction (SCR) has dominated among vehicle emission post-treatment technologies, that is, a reducing agent (referred to as ‘Ad-Blue’ in this field) is quantitatively injected into an exhaust pipe by atomization and the primary harmful gas NOX in exhaust gas is converted through an SCR catalyst into nitrogen and water which are then discharged out, thus the purpose of exhaust purification is achieved, and this is also the commonest technical route for reaching the ‘National Standard IV’. 
         [0004]    An SCR system generally includes a urea box, a metering injection pump, a nozzle and the like, however in the prior art, the modular units above are all independent of each other, just as disclosed in the China patent CN101240729A entitled  Diesel Vehicle Emission and Urea Box Reactor , and connection among the urea box, the metering injection pump and other devices is realized by means of pipes and pipe joints. This typically will lead to the shortcomings below: 
         [0005]    1. Mutual independence of the units and a large number of pipes (including pipes for suction, reflux and the like) result in great difficulty in arrangement, and pipe junctions are liable to be polluted, which brings difficult protection and also the hidden risk of leakage. 
         [0006]    2. There is a high possibility of icing the reducing agent in various pipes under an environment with a relatively low temperature, and ice melting is difficult. 
         [0007]    3. The system cost is high, and a large arrangement space is required by the units. 
         [0008]    4. During practical mounting on vehicle, the matching effect in assembly is poor because the units are independent of each other and provided by different manufacturers, and pipe connection is carried out after all the units are properly mounted, which causes great difficulty in mounting and high possibility of pollution. 
       SUMMARY OF THE INVENTION 
       [0009]    The objective of the invention is to overcome the shortcomings in the prior art and provides an integrated SCR reducing agent storage device with high degree of integration, compact structure, good easiness in ice melting and great convenience for maintenance. 
         [0010]    To fulfill the objective above, the technical proposal below is presented in the invention: the integrated SCR reducing agent storage device includes a liquid storage box and a metering injection unit, the liquid storage box is used for storing reducing agent, and the metering injection unit is integrated with the liquid storage box. 
         [0011]    Preferably, the integrated SCR reducing agent storage device further includes a transition plate, and the metering injection unit is integrated with the liquid storage box via the transition plate. 
         [0012]    The integrated SCR reducing agent storage device includes a water heating unit for heating the liquid storage box and the metering injection unit. 
         [0013]    The metering injection unit further includes a cover body, a pump body, a membrane pump, a filter and a metering valve, the cover body is buckled on the pump body, a closed space is formed between the cover body and the pump body, and the membrane pump is at least arranged in the closed space. 
         [0014]    The integrated SCR reducing agent storage device further includes a transition plate, and the metering injection unit is integrated with the liquid storage box via the transition plate. 
         [0015]    The metering injection unit includes a water heating unit, the water heating unit is downwards extended into the liquid storage box from the transition plate and is used for heating the liquid storage box and the metering injection unit. 
         [0016]    The water heating unit includes a water inlet pipe, a water outlet pipe, and a water circulation pipe arranged in the metering injection unit, the pipes are connected with each other, and the water inlet pipe and the water outlet pipe are extended into the liquid storage box. 
         [0017]    The water heating unit further includes a water inlet joint and a water outlet joint, the water inlet joint and the water outlet joint are arranged on the pump body, and the water inlet joint, the water inlet pipe, the water outlet pipe, the water circulation pipe and the water outlet joint are communicated with each other. 
         [0018]    The integrated SCR reducing agent storage device further includes a sensing component arranged in the liquid storage box, and the sensing components is composed of a liquid level sensor and a first temperature sensor. 
         [0019]    The heat insulating sleeve is further arranged on the water inlet pipe. 
         [0020]    A multi-section liquid flow pipe for circulation of the reducing agent is formed in the pump body. 
         [0021]    The metering injection unit further includes a first pressure sensor and a second pressure sensor arranged at the two ends of the metering valve. 
         [0022]    The metering injection unit further includes a control unit, and the control unit is electrically connected with the membrane pump and the metering valve to control injection of the reducing agent. 
         [0023]    The integrated SCR reducing agent storage device further includes a second temperature sensor arranged in the pump body. 
         [0024]    Compared with the prior art, the integrated SCR reducing agent storage device of the invention has the advantages: 
         [0025]    1) superior design scheme and high degree of integration; 
         [0026]    2) the use of pipes for suction, reflux and heating and of relevant pipe joints is avoided and the leakage risk of the reducing agent is decreased; 
         [0027]    3) heated engine cooling water passes by the metering pump and the liquid storage box directly, which avoids using a water heating device or an electric heating device for heating the metering pump independently; 
         [0028]    4) a heat insulating sleeve is wrapped on the upper portion of the water inlet pipe to heat the reducing agent at the bottom at first, which brings good heating effect and helps timely ice melting and suction of the reducing agent; 
         [0029]    5) the metering pump and the urea box are structurally integrated, so the occupied space is small and the cost is relatively low, meanwhile, convenient disassembly and mounting and excellent matching effect are achieved due to the modularized arrangement. 
         [0030]    6) a filtration cavity and a pressure stabilizing cavity are integrally designed, thus bringing compact structure and good pressure stabilizing effect and contributing to control for the metering valve; 
         [0031]    7) a cyclone mixing cavity is employed to achieve the purposes of small pressure loss, good stirring and atomization effects and low possibility of crystallization blockage. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0032]      FIG. 1  is a stereogram of the integrated SCR reducing agent storage device of the invention; 
           [0033]      FIG. 2  is an exploded stereogram of  FIG. 1 ; 
           [0034]      FIG. 3  is a wiring diagram of the integrated SCR reducing agent storage device of the invention; 
           [0035]      FIG. 4  is an exploded stereogram of the filter in  FIG. 3 ; 
           [0036]      FIG. 5  is a partial sectional view of connection among the filter, the metering valve and the mixing cavity in the invention; 
           [0037]      FIG. 6  is a sectional view in a CC direction of  FIG. 5 ; 
           [0038]      FIG. 7  is a bottom view of the pump body in the integrated SCR reducing agent storage device of the invention; 
           [0039]      FIG. 8  is a top view of the pump body in the integrated SCR reducing agent storage device of the invention; 
           [0040]      FIG. 9  is a stereogram of the transition plate in the invention; 
           [0041]      FIG. 10  is a wiring diagram of the embodiment 2 of the integrated SCR reducing agent storage device of the invention; 
           [0042]      FIG. 11  is a wiring diagram of the embodiment 3 of the integrated SCR reducing agent storage device of the invention. 
           [0000]    
         
           
                 
               
                 
                 
                 
                 
                 
                 
               
             
                 
                     
                 
                 
                   REFERENCE NUMERALS OF ELEMENTS IN THE DRAWINGS 
                 
                 
                     
                 
               
               
                 
                     
                 
               
            
             
                 
                   metering 
                   1 
                   cover body 
                   11 
                   pump body 
                   12 
                 
                 
                   injection unit 
                 
                 
                   lower surface of 
                   121 
                   membrane 
                   13 
                   the first pressure 
                   14 
                 
                 
                   the pump body 
                     
                   pump 
                     
                   sensor 
                 
                 
                   the second 
                   15 
                   liquid flow pipe 
                   16 
                   control unit 
                   17 
                 
                 
                   pressure sensor 
                 
                 
                   annular groove 
                   161 
                   liquid outlet 
                   18 
                   sensing 
                   19 
                 
                 
                     
                     
                   joint 
                     
                   component 
                 
                 
                   liquid storage 
                   2 
                   transition plate 
                   3 
                 
                 
                   box 
                 
                 
                   suction pipe 
                   31 
                   filter 
                   4 
                   filter cavity shell 
                   41 
                 
                 
                   end cover 
                   42 
                   filter core 
                   43 
                   liquid inlet 
                   44 
                 
                 
                   liquid outlet 
                   45 
                   metering valve 
                   5 
                   mixing cavity 
                   6 
                 
                 
                   air throttle 
                   61 
                   check valve 
                   71 
                   membrane valve 
                   72 
                 
                 
                   orifice 
                 
                 
                   the first 
                   73 
                   the third 
                   74 
                   through hole 
                   75 
                 
                 
                   electromagnetic 
                     
                   electromagnetic 
                 
                 
                   valve 
                     
                   valve 
                 
                 
                   nozzle 
                   76 
                   exhaust pipe 
                   77 
                   ventilation pipe 
                   79 
                 
                 
                   water heating 
                   8 
                   water inlet joint 
                   81 
                   water inlet pipe 
                   82 
                 
                 
                   unit 
                 
                 
                   water outlet pipe 
                   83 
                   water outlet 
                   84 
                   water circulation 
                   85 
                 
                 
                     
                     
                   joint 
                     
                   pipe 
                 
                 
                   the first flow 
                   86 
                   heat exchanger 
                   87 
                   heat insulating 
                   88 
                 
                 
                   passage 
                     
                     
                     
                   sleeve 
                 
                 
                   compressed air 
                   9 
                   air source 
                   91 
                   the second 
                   92 
                 
                 
                   unit 
                     
                     
                     
                   electromagnetic 
                 
                 
                     
                     
                     
                     
                   valve 
                 
                 
                   reducing valve 
                   93 
                   the second 
                   94 
                   rough filtration 
                   32 
                 
                 
                     
                     
                   temperature 
                     
                   device 
                 
                 
                     
                     
                   sensor 
                 
                 
                     
                 
               
            
           
         
       
       
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0043]    The technical proposal in the preferred embodiment of the invention will be described below in a clear and complete way with reference to the drawings of the invention. 
         [0044]    As shown in  FIG. 1  and  FIG. 2 , the integrated SCR reducing agent storage device of the invention includes a metering injection unit  1  and a liquid storage box  2 , the metering injection unit  1  is integrated with the liquid storage box  2  via a transition plate  3 , and the metering injection unit includes a cover body  11 , a pump body  12 , a membrane pump  13 , a filter  4 , a metering valve  5 , a mixing cavity  6 , a first pressure sensor  14 , a second pressure sensor  15 , a liquid flow pipe  16  arranged on the pump body and a control unit  17 . 
         [0045]    As shown in  FIG. 3 , the cover body  11  is buckled on the pump body  12 , a closed space is formed between the cover body  11  and the pump body  12 , the membrane pump  13 , the metering valve  5 , the mixing cavity  6 , the first pressure sensor  14  and the second pressure sensor  15  are all arranged in the closed space formed between the cover body  11  and the pump body  12 , the filter  4  is arranged on the pump body  12  at the outer side of the cover body  11  for the purpose of facilitating cleaning and maintenance; the membrane pump  13  is used for sucking the reducing agent from the liquid storage box  2  to the liquid flow pipe  16  of the pump body, in order to offer a power source to convey the reducing agent. 
         [0046]    In the metering injection unit as shown in  FIG. 4  to  FIG. 6 , the filter  4  is fixedly mounted on the pump body  12  and is used for filtering and inhibiting pressure fluctuation, the filter  4  includes a filter cavity shell  41 , an end cover  42  and a filter core  43  arranged in the filter cavity shell and the end cover, the filter cavity shell  41  is integrally formed on the pump body  12 , the end cover  42  is arranged, in a sealing manner, on one end of the filter cavity shell  41 , a liquid inlet  44  and a liquid outlet  45  are arranged on the filter cavity shell  41 , and the liquid outlet  45  is communicated with the liquid inlet of the metering valve  5  via the liquid flow pipe  16  arranged in the pump body. As shown in  FIG. 4 , the liquid inlet  44  of the filter  4  is arranged in a direction tangent to the inner wall of the filter cavity shell  41  of the filter, and such a tangent arrangement of the liquid inlet is implemented to avoid damage to the filter core, which is caused by the fact that, due to vertical arrangement of the liquid inlet and the filter cavity shell  41 , the filter core is directly impacted by the reducing agent under excessive pressure; meanwhile, the reducing agent enters a liquid storage cavity in a manner of deviating from the core shaft direction and then flows in a wall adherence manner to create cushion, thus preventing obvious pressure fluctuation generated by liquid disturbance under vertical entrance of the reducing agent, and playing a role of pressure stabilization. 
         [0047]    As shown in  FIG. 5  and  FIG. 7 , a high-precision metering valve dedicated to urea is used as the metering valve  5  in this embodiment and is used for metering injection of the reducing agent. One end of the metering valve  5  is connected with the filter  4  via a through hole  75  and the liquid flow pipe  16  in the pump body, while the other end thereof is connected with the mixing cavity  6 , which is connected in series at the downstream of the metering valve  5  and mainly has the function of mixing atomization for air-liquid, in order to form homogeneous suspension and optimize purification effect. 
         [0048]    In this embodiment, an injection hole portion at one end of the metering valve  5  stretches into the mixing cavity  6 , an air throttle orifice  61  is arranged on the inner wall of the mixing cavity  6 , the other end of the air throttle orifice is communicated with an air source, the air throttle orifice  61  is tangent to the inner wall of the mixing cavity  6  and provides an inlet of compressed air source for air-liquid mixing in the mixing cavity  6 , and in the process of injecting the reducing agent by the metering valve  5 , a high-speed airflow tangentially enters the mixing cavity  6  via the air throttle orifice  61 . 
         [0049]    Based on the principle of cyclone separator, when a tangent airflow enters the mixing cavity  6 , an outward rotation airflow and an inward rotation airflow are formed in the cavity, the outward rotation airflow is rotated in a manner of cavity wall adherence and is blown in a direction away from the liquid outlet joint, i.e. in a direction towards the metering valve  5 , the inward rotation airflow, which moves in a direction opposite to the outward rotation airflow, is formed when the tangent airflow reaches the top of the mixing cavity  6 , at the same time, when the airflows are converged at the injection hole of the metering valve  5 , the injected reducing agent is fully stirred by the inward rotation airflow under the action of the injection pressure from the metering valve and is then blown downwards and injected out through the liquid outlet joint, urea aqueous solution can be formed into homogeneous suspension due to the stirring effect in the mixing cavity  6 , thus reducing the crystallization risk and contributing to forming homogeneous spray at an atomization nozzle at the downstream of the liquid outlet joint so as to improve the effect of selective catalytic reaction. 
         [0050]    One end of the mixing cavity  6 , which is far away from the metering valve  5 , is communicated with the liquid outlet joint  18  on the sidewall of the pump body via the liquid flow pipe  16  in the pump body, and the liquid outlet joint  18  is connected with an exhaust pipe  77  via an injection pipe and a nozzle  76 . Preferably, the position of the liquid outlet joint  18  is lower than that of the metering valve  5 , an acute angle is formed between the axis of the mixing cavity  6  and the horizontal direction, that is to say, the mixing cavity  6  is arranged obliquely, preferably a 20-degree angle formed between the mixing cavity  6  and the horizontal direction, in this way, after the injection operation comes to an end, the reducing agent is not refluxed to block off the injection hole of the metering valve, instead, it flows downwards (i.e. the direction of the liquid outlet joint) under the action of gravity even if there is reducing agent remaining in the mixing cavity. 
         [0051]    As shown in  FIG. 7  and  FIG. 8 , the liquid flow pipe  16  consists of multiple sections of pipes that are arranged at the inner side of the pump body  12  and in the space between the lower surface  121  of the pump body and the transition plate  3  in a penetrating manner, the membrane pump  13 , the filter  4  and the metering valve  5  are sequentially communicated with each other via the liquid flow pipe  16  in the pump body, one end of the liquid flow pipe  16  is connected with a suction pipe  31  extending downwards from the lower side of the transition plate  3  and then sequentially connected with the membrane pump  13  and a check valve  71  mounted on the pump body  12  to be divided into two flow passages, one of the flow passages is connected with the liquid inlet  44  of the filter  4  via the through hole  75  penetrating through the pump body in the drawing and via an annular groove  161 , so that the reducing agent that needs to be injected is conveyed into the filter  4  and then filtered, and finally conveyed into the metering valve  5 ; the other flow passage forms a liquid reflux pipe connected with a membrane valve  72  and the liquid storage box, as shown in  FIG. 10 , and the bottom of the suction pipe  31  is connected with a rough filtration device  32  in order to prevent blockage in the injection system caused by entrance of the impurities in the reducing agent. 
         [0052]    As shown in  FIG. 2 ,  FIG. 3 ,  FIG. 7  and  FIG. 9 , the integrated SCR reducing agent storage device of the invention further includes a water heating unit  8 , the water heating unit  8  uses heated engine cooling water in a recycling manner, so the reducing agent in the metering injection unit and the liquid storage box can be heated in cold seasons, meanwhile, the heated engine cooling water flows circularly inside the water circulation pipe to heat the pump body  12 . 
         [0053]    The water heating unit  8  includes a water inlet joint  81 , a water inlet pipe  82 , a water outlet pipe  83 , a water outlet joint  84  and a multi-section water circulation pipe  85 , the water circulation pipe  85  includes a first flow passage  851  and a second flow passage  852  both arranged inside the pump body  12 , and a third flow passage  853  formed between the lower surface  121  of the pump body  12  and the transition plate  3 , and the first flow passage  851  and the second flow passage  852  are respectively connected with the water inlet joint  81  and the water outlet joint  84  arranged on the sidewall of the pump body. 
         [0054]    The water inlet pipe  82  and the water outlet pipe  83  are formed in a manner of extending downwards from the lower side of the transition plate  3 , the upper ends of the both are communicated with the third flow passage  853  of the water circulation pipe  85  respectively and the bottoms of the both are communicated with each other through a heat exchanger  87 , and the water inlet joint  81 , the water inlet pipe  82 , the water outlet pipe  83  and the water outlet joint  84  are communicated with each other in sequence through the water circulation pipe  85  in order to impart a good heating on the reducing agent in the pump body  12  and the liquid storage box  2 . 
         [0055]    Preferably, the heat exchanger  87 , which is formed on the bottom of the liquid storage box at the junction of the water inlet pipe  82  and the water outlet pipe  83 , is a spiral structure for increasing the heating area, a heat insulating sleeve  88  is wrapped on the outer surface of the upper portion of the water inlet pipe  82 , and the heat insulating sleeve  88  is arranged to avoid, when the heated cooling water flows by the upper portion of the water inlet pipe, loss of excessive heat, which in turn melts the ice at the bottom of the urea box at first in order to contribute to suction. 
         [0056]    More preferably, the metering injection device of the invention further includes a ventilation pipe  79 , and the ventilation pipe  79 , the suction pipe  31  and the water inlet pipe  82  are all wrapped in the heat insulating sleeve  88 . 
         [0057]    As shown in  FIG. 3 , a first electromagnetic valve  73  is further arranged on the pipeline of the water inlet pipe in the water heating unit  8 , the first electromagnetic valve  73  is electrically connected with the control unit  17 , and the control unit  17  controls the heated cooling water to perform cyclic heating and ice melting by controlling the first electromagnetic valve  73 . 
         [0058]    The control unit  17  is electrically connected with the membrane pump  13 , the metering valve  5 , and the first pressure sensor  14  and the second pressure sensor  15  mounted on the two ends of the metering valve  5  and the mixing cavity  6 , wherein the first pressure sensor  14  is arranged at the upstream end of the metering valve  5 , the second pressure sensor  15  is arranged at the downstream end of the metering valve  5 , and according to a specified injection amount received by the control unit and a pressure difference between the two ends of the metering valve, the first pressure sensor  14  and the second pressure sensor  15  calculate the duty ratio of the starting pulse of the metering valve  5  to achieve the purpose of accurate metering. 
         [0059]    The metering injection device in this embodiment further includes a compressed air unit  9 , the compressed air unit  9  includes an air source  91 , a second electromagnetic valve  92  and a reducing valve  93  which are serially connected in sequence, the second electromagnetic valve  92  is in circuit connection with the control unit  17 , an air filter is further arranged at the downstream of the air source  91 , the compressed air unit can not only provide air pressure for opening or closing of the membrane valve  71 , but also provide compressed air for atomization of the reducing agent in the mixing cavity  6 . 
         [0060]    As shown in  FIG. 3  and  FIG. 9 , the metering injection device of the invention further includes a sensing component  19 , the sensing component  19  is composed of a displacement sensor and a first temperature sensor, the sensing component and the water heating unit are integrated below the metering injection unit, the sensing component is electrically connected with the control unit in the metering injection unit, and the sensing component provides sensed information regarding liquid level and temperature in the liquid storage box. More preferably, a second temperature sensor  94  for measuring the reducing agent in the pump body is further mounted in the pump body  12 . 
         [0061]    When the control unit receives an engine ignition signal, the control unit  17  controls a motor in the membrane pump  13  to begin an emptying action at a certain fixed rotating speed, so that the reducing agent in the liquid flow pipe  16  is returned to the liquid storage box  2  through a reflux pipe, and about 30 seconds later, the control unit  17  controls the second electromagnetic valve  72  to open the air source and close an emptying loop, the membrane pump  13  continues working at this moment, the reducing agent is conveyed to the upstream of the metering valve  5  by the pump body after passing through the liquid flow pipe  16  and the filter  4 , the pressure of the reducing agent increases ceaselessly, the motor of the membrane pump stops operating when a pressure value P1 of the first pressure sensor  14  at the upstream of the metering valve  5  reaches a set value, the control unit receives an injection request and controls the metering valve  5  to begin metering injection, and the second pressure sensor  15  is used for acquiring a pressure value P2 at the downstream of the metering valve to calculate the pressure difference, and for regulating the opening pulse width of the metering valve. 
         [0062]    The pressure value (P1) of the first pressure sensor  14  is relatively small after the control unit  17  controls the compressed air unit to close a liquid return membrane and before injection, at this moment, the control unit  17  controls the motor in the membrane pump to operate at a preset rotating speed, and about 5 seconds later, the pressure value P1 in the filtration cavity reaches an injection pressure value; P1 will decrease after injection begins, specifically depending on the injection amount, and in order to keep P1 stable, the motor begins working and the reducing agent is supplemented into the filtration cavity to keep the P1 value stable, furthermore, during this procedure, the rotating speed of the motor is subjected to closed-loop control in accordance with the injection amount and the current P1 value, so as to achieve the purpose of accurate metering. 
         [0063]    When heating is needed at a relatively low temperature, the control unit  17  controls the second electromagnetic valve  92  to open the water heating unit after receiving a low temperature signal from the temperature sensor in inductive sensors, the heated engine cooling water flows by the water inlet joint  81 , the water inlet pipe  82 , the water outlet pipe  83  and the water outlet joint  84  in sequence, which realizes heating not only for the metering injection unit, but also for the reducing agent in the liquid storage box  2 . 
         [0064]      FIG. 10  is a system control diagram of the embodiment 2 of the invention, an air injection system is involved in both this embodiment and the embodiment 1, which have the difference that the pipe of the nozzle  76  at the downstream of the metering injection unit  1  is communicated with the compressed air unit  9  to achieve the effect of secondary atomization. 
         [0065]      FIG. 11  is a system control diagram of the embodiment 3 of the invention, an airless injection system is involved in this embodiment, and the difference between this embodiment and the embodiment 1 consists in the fact that no compressed air unit is required in this embodiment, the reducing agent is directly injected into the exhaust pipe  77  by the metering valve  5 , and on the reflux pipe, a third electromagnetic valve  74  is in direct circuit connection with the control unit  17 , which directly controls opening and closing of the third electromagnetic valve  74  to control reflux and further finish the emptying operation. 
         [0066]    The technical contents and features of the invention have been disclosed above, however, a variety of substitutions and modifications not departing from the spirit of the invention may still be made by those skilled familiar with the art based upon the instruction and disclosure of the invention, thus, the scope of the invention shall not be limited to the contents disclosed in the embodiments, instead, it shall include a variety of substitutions and modifications that do not depart from the invention and is covered by the claims of this patent application.