CN110208479B - Data management system for water quality detection data - Google Patents
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- CN110208479B CN110208479B CN201910543535.6A CN201910543535A CN110208479B CN 110208479 B CN110208479 B CN 110208479B CN 201910543535 A CN201910543535 A CN 201910543535A CN 110208479 B CN110208479 B CN 110208479B
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Abstract
The invention discloses a data management system for water quality detection data, which comprises a water purifier, a TDS detector and an intelligent terminal. Improve the detection data abundance through the TDS detector that can gather check-out time, gather position, collection result, improve work efficiency through the step when retrenching data acquisition's step and data transmission the TDS detector includes detection module, first NFC module, first bluetooth module, data storage module: the detection module acquires temperature data and ppm concentration data through a detection probe and takes the temperature data and the ppm concentration data as detection data; improve the detection data abundance through the TDS detector that can gather check-out time, gather position, collection result, improve work efficiency through the step when retrenching data acquisition's step and data transmission.
Description
Technical Field
The invention relates to the field of water quality detection equipment, in particular to a data management system for water quality detection data.
Background
The water quality test pen is also called TDS test pen. TDS water quality test pen is a simple and easy portable water quality testing instrument for the TDS value of test water or the conductivity of water, in order to judge the purity or the pollution degree of water. Meanwhile, the device has the function of testing water temperature and ambient temperature. The product can be widely applied to water treatment industry, drinking water industry, families, individual families, travel, field operation and the like as a tool for detecting and distinguishing water quality.
The existing TDS test pen has single function, only can simply record ppm and temperature values, if the water quality of a plurality of water intakes is required to be detected, liquid is generally required to be prepared for detection, data is read after detection, next detection can be carried out after manual recording, the data acquisition and transmission process are very complicated, a large amount of data cannot be faced, and the data arrangement and sharing are also very inconvenient. According to prior art, want to acquire other data, need cooperate other equipment to gather, lead to operating procedure loaded down with trivial details, reduce work efficiency.
As disclosed in patent document CN207300954U, a TDS test pen is disclosed, which comprises: a pen body; the power supply assembly is arranged on the pen body; the detection assembly is arranged on the pen body and comprises a probe and a temperature sensor; the display assembly comprises a display screen and a backlight sheet, the display screen is used for displaying detection numerical values, and the backlight sheet is used for displaying different colors according to the detection numerical values; and the electric control board is respectively connected with the power supply assembly, the detection assembly and the display assembly. According to the TDS detection pen, by simultaneously arranging the display screen and the backlight piece, the display component can realize the backlight effect of simultaneously displaying the detection value and the value range, thereby realizing the function of double reminding of the detected TDS value; the method has the advantages of single obtained detection data, low richness and no contribution to later-stage data analysis and mining.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a data management system for water quality inspection data, which improves the richness of inspection data by a TDS inspection apparatus capable of acquiring inspection time, an acquisition position, and an acquisition result, and improves the work efficiency by simplifying the steps of data acquisition and the steps of data transmission.
The technical problem to be solved by the invention is as follows:
(1) how to improve the detection data abundance of water quality detection of the water purifier.
(2) How to improve the work efficiency in the process of detecting data acquisition and transmission.
The purpose of the invention can be realized by the following technical scheme:
a data management system for water quality detection data comprises a water purifier, a TDS detector and an intelligent terminal,
TDS detector includes detection module, a NFC module, a bluetooth module, data storage module: the detection module acquires temperature data and ppm concentration data through a detection probe and takes the temperature data and the ppm concentration data as detection data; the first NFC module is used for receiving basic information sent by the third NFC module, and is also used for pairing with the intelligent terminal after water quality detection is finished and establishing Bluetooth connection; the data storage module is used for storing basic information and detection data, classifying the detection data and clearing all the detection data after the detection data are transmitted to the intelligent terminal; the first Bluetooth module is used for sending the classified detection data to the intelligent terminal after the first NFC module is connected with the intelligent terminal; the basic information includes a machine number, detection time information, and position information.
The intelligent terminal comprises a second NFC module and a second Bluetooth module; the second NFC module is used for pairing with the first NFC module; the second Bluetooth module is used for receiving the detection data sent by the first Bluetooth module and storing the detection data in the intelligent terminal;
the water purifier comprises a third NFC module and a network module; the third NFC module is used for sending basic information to the first NFC module after the purifier is connected with the TDS detector, and the network module is used for acquiring real-time as detection time information when detecting and acquiring positioning data as position information when detecting through network positioning.
Furthermore, the TDS detector comprises a shell, the shell is arranged in a sealed mode, a sealing adhesive layer is laid on the outer surface of the shell, one end of the shell is fixedly connected with a detection probe, the detection probe comprises a temperature probe and a group of ppm probes, a pair of parallel protection plates are arranged on two sides of the detection probe, the protection plates are fixedly connected to the outer wall of the shell, a limiting plate is fixedly sleeved on the shell, the first NFC module is fixedly embedded in the limiting plate, and iron plates fixedly embedded in the limiting plate in a parallel mode are arranged on two sides of the first NFC module;
the water outlet end of the water purifier is fixedly connected with a connecting pipe which is longitudinally arranged in a run-through manner, the side wall of the connecting pipe is connected with a water outlet pipe in a run-through manner, the water outlet pipe and the connecting pipe are rigid pipes, the inner side wall of the connecting pipe is provided with a pair of longitudinal sliding grooves which are parallel to each other, the two longitudinal sliding grooves are positioned at two sides of the joint of the water outlet pipe and the connecting pipe, the lower end of the connecting pipe is connected with the upper end surface of the detection box in a run-through manner, the joint of the inner side wall of the detection box is provided with four transverse sliding grooves which are parallel to the water outlet pipe, the four transverse sliding grooves are all connected with the same transverse adjusting plate in a sliding manner, each transverse adjusting plate is composed of a connecting plate, a first transverse sliding plate and a second transverse sliding plate, the connecting, the first transverse sliding plate is connected in two transverse sliding grooves on the same horizontal plane in a sliding manner, the upper end surface of the connecting plate is fixedly connected with the second transverse sliding plate, the second transverse sliding plate is connected in the other two transverse sliding grooves on the same horizontal plane in a sliding manner, the second transverse sliding plate is provided with a liquid guide hole, a longitudinal adjusting plate is movably inserted in the liquid guide hole, the longitudinal adjusting plate consists of a buoyancy plate and a longitudinal sliding plate, the upper end of the buoyancy plate is fixedly connected with the longitudinal sliding plate, the longitudinal sliding plate is provided with a water drain hole, the longitudinal sliding plate is connected in the two longitudinal sliding grooves in a sliding manner, sealing glue layers are respectively paved on the outer walls of the longitudinal sliding plate and the second transverse sliding plate, the side wall of a return spring far away from the detection box is provided with an insertion hole matched with a shell, and the inner side wall of the detection box above, the lateral wall that the detection case is located the patchhole top is fixed to be inlayed and is matchd the third NFC module of first NFC module, the both sides of third NFC module are provided with the magnetic stripe of matching iron plate, the magnetic stripe is fixed to be inlayed in the lateral wall of detection case.
Further, the buoyancy plate is a foam plate, and the interior of the buoyancy plate is of a hollow structure.
Further, the longitudinal section of the shell is in any one of a rectangle or an isosceles trapezoid.
The invention has the beneficial effects that:
(1) the information richness of the detection data is improved: carry out water quality testing time, insert the TDS detector from the patchhole, conflict until limiting plate and third NFC module, because iron plate and magnetic stripe are close to and have the appeal, and then make TDS detector and detection case adsorb together fixedly, because first NFC module in the limiting plate is close to with third NFC module, make the purifier be connected with the TDS detector, every obtain one detection data back of TDS detector, because this data volume is less, through first NFC module and the primary information of third NFC module receiving and dispatching, the operation is simple and fast, need not unnecessary setting and connection step, and bind this primary information as the label of latest detection data. Can accomplish the injection into of detection liquid when inserting the TDS detector, reduced the liquid flow rate simultaneously to the influence of detecting data, accomplish and detect the back, extract the TDS detector, repeat above-mentioned operation, can note the multiunit and detect data, data acquisition is quick more and convenient, realized every detection data simultaneously and all have corresponding machine serial number, detection time information, positional information, make things convenient for the arrangement in later stage and look up, avoided the influence of temperature to detection data.
(2) Efficiency in data acquisition and transmission process is improved: after the water quality detection of a plurality of water purifiers is finished, a large amount of detection data are stored in the TDS detector, the data volume is large, a module with higher transmission speed is needed to finish data transmission, at the moment, the first NFC module is close to the second NFC module of the intelligent terminal and serves as a tool for realizing Bluetooth pairing, the pairing step before data transmission is simplified, after the TDS detector is paired with the intelligent terminal, the first Bluetooth module of the TDS detector is automatically connected with the second Bluetooth module of the intelligent terminal, at the moment, the data storage module puts the detection data into a file according to a tree pile structure of machine number, position information and detection time information and compresses the detection data into a single file, the improvement of data transmission efficiency is facilitated, the detection data can be conveniently checked on the intelligent terminal, all compressed files are sequentially transmitted to the intelligent terminal, and after the transmission is finished, the data storage module carries out formatting processing on the detection data, the utilization rate of the storage module is improved, the functions of storing detection data and sharing data by the TDS detector are realized, the working efficiency of water quality detection of the water purifier can be improved, and the data sharing mode is simple, fast and convenient to use.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a system block diagram of the present invention;
FIG. 2 is a schematic diagram of the TDS detector of the present invention;
FIG. 3 is a schematic view of a partial structure of the water purifier of the present invention;
FIG. 4 is a perspective view, partially in section, of the TDS meter of the invention inserted into a test chamber;
FIG. 5 is a perspective view, partially in section, of the TDS meter of the invention shown without the test chamber inserted therein;
FIG. 6 is a schematic view of the construction of a lateral adjustment plate of the present invention;
fig. 7 is a schematic view of the structure of the longitudinal adjustment plate of the present invention.
In the figure: the device comprises a shell 1, a detection probe 2, a protection plate 3, a limit plate 4, a connecting pipe 5, a longitudinal sliding groove 501, a water outlet pipe 6, a detection box 7, a transverse sliding groove 701, a magnetic strip 8, a third NFC module 9, an insertion hole 10, a return spring 11, a transverse adjusting plate 12, a connecting plate 1201, a first transverse sliding plate 1202, a second transverse sliding plate 1203, a liquid guide hole 1204, a longitudinal adjusting plate 13, a buoyancy plate 1301, a longitudinal sliding plate 1302, a water drainage hole 1303 and a shielding plate 14.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 7, the present embodiment provides a data management system for water quality detection data, including a water purifier, a TDS detector, and an intelligent terminal.
TDS detector includes detection module, a NFC module, a bluetooth module, data storage module: the detection module acquires temperature data and ppm concentration data through the detection probe 2 and takes the temperature data and the ppm concentration data as detection data; the first NFC module is used for receiving basic information sent by the third NFC module 9, and is also used for pairing with the intelligent terminal after water quality detection is finished and establishing Bluetooth connection; the data storage module is used for storing basic information and detection data, classifying the detection data and clearing all the detection data after the detection data are transmitted to the intelligent terminal; the first Bluetooth module is used for sending the classified detection data to the intelligent terminal after the first NFC module is connected with the intelligent terminal; the basic information includes a machine number, detection time information, and position information.
The intelligent terminal comprises a second NFC module and a second Bluetooth module; the second NFC module is used for pairing with the first NFC module; the second Bluetooth module is used for receiving the detection data sent by the first Bluetooth module and storing the detection data in the intelligent terminal;
the water purifier comprises a third NFC module 9 and a network module; the third NFC module 9 is used for sending basic information to the first NFC module after the water purifier is connected with the TDS detector, and the network module is used for acquiring real-time as detection time information when detecting and acquiring positioning data as position information when detecting through network positioning.
The TDS detector comprises a shell 1, elements of the TDS detector are all arranged in the shell 1, the shell 1 is arranged in a sealed mode, a sealing adhesive layer is paved on the outer surface of the shell 1, one end of the shell 1 is fixedly connected with a detection probe 2, the detection probe 2 comprises a temperature probe and a group of ppm probes and is respectively used for detecting water temperature and ppm numerical values, a pair of parallel protection plates 3 are arranged on two sides of the detection probe 2, the protection plates 3 are fixedly connected to the outer wall of the shell 1, a limiting plate 4 is fixedly sleeved on the shell 1, a first NFC module is fixedly embedded in the limiting plate 4, and iron plates fixedly embedded in the limiting plate 4 in parallel are arranged on two sides of the first NFC module; the protection plate 3 can play a role of protecting the probe when not in use, can be used for abutting against the transverse adjusting plate 12 when in detection, can reduce the shaking degree of local water flow, and is beneficial to improving the accuracy of water quality detection data;
the water outlet end of the water purifier is fixedly connected with a connecting pipe 5 which is longitudinally arranged in a through manner, the side wall of the connecting pipe 5 is connected with a water outlet pipe 6 in a through manner, the water outlet pipe 6 and the connecting pipe 5 are rigid pipes, the inner side wall of the connecting pipe 5 is provided with a pair of longitudinal sliding grooves 501 which are parallel to each other and used for realizing the up-and-down sliding of a longitudinal adjusting plate 13, the two longitudinal sliding grooves 501 are positioned at two sides of the joint of the water outlet pipe 6 and the connecting pipe 5, the lower end of the connecting pipe 5 is connected with the upper end surface of a detection box 7 in a through manner, the joint of the inner side wall of the detection box 7 is provided with four transverse sliding grooves 701 which are parallel to the water outlet pipe 6 and used for realizing the transverse sliding of a transverse adjusting plate 12, and the groove-shaped arrangement is higher in, the four transverse sliding grooves 701 are all connected with the same transverse adjusting plate 12 in a sliding manner, the transverse adjusting plate 12 is composed of a connecting plate 1201, a first transverse sliding plate 1202 and a second transverse sliding plate 1203, the connecting plate 1201 is fixedly connected with one end of a return spring 11, the other end of the return spring 11 is fixedly connected to the inner side wall of the detection box 7, the lower end surface of the connecting plate 1201 is fixedly connected with the first transverse sliding plate 1202, the first transverse sliding plate 1202 is slidably connected in the two transverse sliding grooves 701 on the same horizontal plane, the upper end surface of the connecting plate 1201 is fixedly connected with the second transverse sliding plate 1203, the second transverse sliding plate 1203 is slidably connected in the other two transverse sliding grooves 701 on the same horizontal plane, a liquid guide hole 1204 is formed in the second transverse sliding plate 1203, and a longitudinal adjusting plate 13 is movably inserted in the liquid guide hole 1204, the longitudinal adjusting plate 13 is composed of a buoyancy plate 1301 and a longitudinal sliding plate 1302, the upper end of the buoyancy plate 1301 is fixedly connected with the longitudinal sliding plate 1302, the longitudinal sliding plate 1302 is provided with a drain hole 1303, the longitudinal sliding plate 1302 is slidably connected in the two longitudinal sliding grooves 501, sealing glue layers are laid on the outer walls of the longitudinal sliding plate 1302 and the second transverse sliding plate 1203, the side wall of a return spring 11 far away from the detection box 7 is provided with an insertion hole 10 matched with the housing 1, the inner side wall of the detection box 7 above the insertion hole 10 is rotatably connected with a shielding plate 14, the outer side wall of the detection box 7 above the insertion hole 10 is fixedly embedded with a third NFC module 9 matched with the first NFC module, magnetic strips 8 matched with iron plates are arranged on two sides of the third NFC module 9, and the magnetic strips 8 are fixedly embedded in the side wall of the detection.
The buoyancy plate 1301 is a foam plate, the interior of the buoyancy plate is of a hollow structure, the weight is lighter, and the provided buoyancy is larger.
The longitudinal section of the shell 1 is any one of rectangle or isosceles trapezoid, and the fool-proof design prevents reverse insertion when the insertion hole 10 is inserted.
The specific working process of this embodiment is as follows:
1) when the TDS detecting device is not inserted into the detecting box 7, as shown in fig. 5, the thrust of the return spring 11 makes the lateral adjusting plate 12 located at the right side inside the detecting box 7, at this time, the second lateral sliding plate 1203 blocks the connection between the detecting box 7 and the connecting pipe 5, at the same time, because the second lateral sliding plate 1203 provides a supporting force, the longitudinal adjusting plate 13 is entirely located in the connecting pipe 5, at this time, the water discharging hole 1303 is located at the connection between the connecting pipe 5 and the water outlet pipe 6, at this time, water flows from the connecting pipe 5 to the water outlet pipe 6, and at the same time, the insertion hole 10 is blocked by.
2) When water quality detection is carried out, the TDS detector is inserted into the insertion hole 10, as shown in fig. 4, the shielding plate 14 is pushed away to make the protective plate 3 abut against the connecting plate 1201, and the reset spring 11 is compressed to make the transverse adjusting plate 12 move leftwards along the transverse sliding groove 701 as a whole until the limiting plate 4 abuts against the third NFC module 9, because the iron plate and the magnetic strip 8 are close to each other, the TDS detector and the detection box 7 are adsorbed and fixed together, meanwhile, the transverse adjusting plate 12 is pushed to the leftmost end, at this time, the liquid guide hole 1204 moves to the connection position of the connecting pipe 5 and the detection box 7 to make the connecting pipe 5 communicate with the detection box 7, meanwhile, the longitudinal adjusting plate 13 is no longer supported by the second transverse sliding plate 1203, because of gravity, the longitudinal adjusting plate 13 moves downwards along the longitudinal sliding groove 501 as a whole until the longitudinal adjusting plate 13 abuts against the inner bottom wall of the detection box, at this time, the drain hole 1303 is no longer located at the connection position of the connection pipe 5 and the water outlet pipe 6, the connection position of the connection pipe 5 and the water outlet pipe 6 is blocked by the longitudinal sliding plate 1302, at this time, water flows from the connection pipe 5 to the detection box 7, the buoyancy plate 1301 receives the buoyancy of the water along with the rise of the water level in the detection box 7 to drive the longitudinal adjustment plate 13 to move upwards integrally until the longitudinal adjustment plate 13 integrally enters the connection pipe 5 again, the water flows from the connection pipe 5 to the water outlet pipe 6 again, and at this time, the injection of the detection liquid is. The detection liquid is located the detection case 7, even if the water inlet machine is used at the same time, the interference of water flow on the liquid in the detection case 7 is small, and the data error caused by liquid shaking and temperature change can be reduced.
3) Because first NFC module in the limiting plate 4 is close to with third NFC module 9, make the purifier be connected with the TDS detector, make the TDS detector begin to detect this moment, every obtain a detected data after the TDS detector, because this data volume is less, basic information is once received and dispatched with third NFC module 9 through first NFC module, and bind this basic information as the label of newest detected data, make every detected data all have the machine number that corresponds, detection time information, positional information, make things convenient for the arrangement in later stage and look up, accomplish and detect the back, extract the TDS detector, resume the state in 1 again this moment, repeat above-mentioned step many times, can note multiunit detected data.
4) After the water quality testing of a plurality of water purifiers is completed, a large amount of detection data are stored in the TDS detector, the data volume is large, the first NFC module is close to the second NFC module of the intelligent terminal, the TDS detector is matched with the intelligent terminal, the first Bluetooth module of the TDS detector is automatically connected with the second Bluetooth module of the intelligent terminal, the detection data are placed into a file by the data storage module according to a tree pile structure of machine number, position information and detection time information and are compressed into a single file, all compressed files are transmitted to the intelligent terminal in sequence, and after the transmission is completed, the data storage module carries out formatting processing on the detection data.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
Claims (1)
1. The utility model provides a data management system for water quality testing data, includes purifier, TDS detector, intelligent terminal, its characterized in that:
TDS detector includes detection module, a NFC module, a bluetooth module, data storage module: the detection module acquires temperature data and ppm concentration data through the detection probe (2) and takes the temperature data and the ppm concentration data as detection data; the first NFC module is used for receiving basic information sent by the third NFC module (9), and is also used for pairing with the intelligent terminal after water quality detection is finished and establishing Bluetooth connection; the data storage module is used for storing basic information and detection data, classifying the detection data and clearing all the detection data after the detection data are transmitted to the intelligent terminal; the first Bluetooth module is used for sending the classified detection data to the intelligent terminal after the first NFC module is connected with the intelligent terminal; the basic information comprises a machine number, detection time information and position information;
the intelligent terminal comprises a second NFC module and a second Bluetooth module; the second NFC module is used for pairing with the first NFC module; the second Bluetooth module is used for receiving the detection data sent by the first Bluetooth module and storing the detection data in the intelligent terminal;
the water purifier comprises a third NFC module (9) and a network module; the third NFC module (9) is used for sending basic information to the first NFC module after the water purifier is connected with the TDS detector, and the network module is used for acquiring real-time as detection time information during detection and acquiring positioning data as position information during detection through network positioning;
the TDS detector comprises a shell (1), wherein the shell (1) is arranged in a sealed mode, a sealing adhesive layer is laid on the outer surface of the shell, one end of the shell (1) is fixedly connected with a detection probe (2), the detection probe (2) comprises a temperature probe and a group of ppm probes, a pair of parallel protection plates (3) is arranged on two sides of the detection probe (2), the protection plates (3) are fixedly connected to the outer wall of the shell (1), a limiting plate (4) is fixedly sleeved on the shell (1), a first NFC module is fixedly embedded in the limiting plate (4), and iron plates fixedly embedded in the limiting plate (4) in a parallel mode are arranged on two sides of the first NFC module;
the water outlet end of the water purifier is fixedly connected with a connecting pipe (5) which is longitudinally arranged in a through mode, the side wall of the connecting pipe (5) is connected with a water outlet pipe (6) in a through mode, the water outlet pipe (6) and the connecting pipe (5) are rigid pipes, a pair of longitudinal sliding grooves (501) which are parallel to each other are formed in the inner side wall of the connecting pipe (5), the longitudinal sliding grooves (501) are located on two sides of the joint of the water outlet pipe (6) and the connecting pipe (5), the lower end of the connecting pipe (5) is connected to the upper end face of a detection box (7) in a through mode, four transverse sliding grooves (701) which are parallel to the water outlet pipe (6) are formed in the joint of the inner side wall of the detection box (7), the four transverse sliding grooves (701) are all connected with the same transverse adjusting plate (12) in a, The detection box comprises a second transverse sliding plate (1203), the connecting plate (1201) is fixedly connected with one end of a return spring (11), the other end of the return spring (11) is fixedly connected to the inner side wall of the detection box (7), the lower end face of the connecting plate (1201) is fixedly connected with a first transverse sliding plate (1202), the first transverse sliding plate (1202) is slidably connected into two transverse sliding grooves (701) on the same horizontal plane, the upper end face of the connecting plate (1201) is fixedly connected with a second transverse sliding plate (1203), the second transverse sliding plate (1203) is slidably connected into the other two transverse sliding grooves (701) on the same horizontal plane, a liquid guide hole (1204) is formed in the second transverse sliding plate (1203), a longitudinal adjusting plate (13) is movably inserted in the liquid guide hole (1204), and the longitudinal adjusting plate (13) comprises a buoyancy plate (1301) and a longitudinal sliding plate (1302), the upper end of the buoyancy plate (1301) is fixedly connected with a longitudinal sliding plate (1302), the longitudinal sliding plate (1302) is provided with a water drainage hole (1303), the longitudinal sliding plate (1302) is connected in a sliding way in two longitudinal sliding grooves (501), sealing glue layers are respectively paved on the outer walls of the longitudinal sliding plate (1302) and the second transverse sliding plate (1203), an insertion hole (10) matched with the shell (1) is formed in the side wall, away from the return spring (11), of the detection box (7), the inner side wall of the detection box (7) above the insertion hole (10) is rotatably connected with a shielding plate (14), a third NFC module (9) matched with the first NFC module is fixedly embedded in the outer side wall of the detection box (7) above the insertion hole (10), magnetic stripes (8) matched with the iron plates are arranged on two sides of the third NFC module (9), and the magnetic stripes (8) are fixedly embedded in the side wall of the detection box (7);
the buoyancy plate (1301) is a foam plate, and the interior of the buoyancy plate is of a hollow structure;
the longitudinal section of the shell (1) is any one of a rectangle or an isosceles trapezoid.
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