An urn-type septic tank for rural sanitary toilets

Abstract

The present invention discloses an earthenware septic tank for rural sanitary toilets, which comprises an earthenware body. The upper part of the earthenware body is respectively provided with a fecal inlet and an outlet. The fecal inlet and the outlet are vertically opened upward along the two axial sides of the earthenware body. The fecal inlet is connected to a toilet through a fecal inlet pipe. The outlet is used for discharging fecal sewage or connecting to the next-level septic tank through a connecting pipe. The present invention can effectively solve the technical problems existing in the existing earthenware septic tank due to the lateral setting of the pipe connection port, such as easy leakage, easy sedimentation and blockage, large floor area of the earthenware body, low utilization rate of the internal volume, etc. due to unreasonable structure. And by setting annular ribs and longitudinal ribs on the earthenware body, the compressive capacity and ring stiffness of the septic tank can be greatly improved. The earthenware body is made by a rotational molding one-piece forming process, the product is formed without pressure, has good edge strength, high compressive strength, is acid and alkali resistant, corrosion resistant, and can be buried deeply, and is widely applicable to septic tanks for rural toilet renovation in collapsible loess geological areas in the cold and arid regions of northwest China.

Description

Technical Field

[0001] The present invention belongs to the technical field of domestic sewage treatment, and relates to a septic tank, specifically an earthenware septic tank suitable for the rural toilet renovation plan. Background Art

[0002] With the rapid growth of economic construction, the living conditions in rural areas are gradually improving. Most traditional rural toilets are open pit dry toilets, which are dirty, smelly, have many mosquitoes and are prone to disease transmission; they cannot be flushed, especially during rain, and are easily washed into river ditches and water bodies, polluting groundwater, seriously affecting environmental hygiene, and there are also great safety hazards. According to statistics, 80% of infectious diseases in rural areas of our country are caused by toilet fecal pollution and unhygienic drinking water, and there are more than 30 infectious diseases related to feces. Widely implementing the rural toilet renovation plan can effectively reduce the incidence of intestinal infectious diseases and parasitic diseases in rural areas and improve the health level and quality of life of rural residents. However, the core of rural toilet renovation is "what to renovate". What is renovated is to replace the original earthen pit of the dry toilet with a septic tank that does not leak, so as to prevent fecal sewage from running, seeping and leaking, and solve the problems of the traditional dry toilet being dirty, smelly, having many mosquitoes, being prone to disease transmission, and seriously polluting environmental hygiene. Then, what kind of septic tank is suitable for the needs of rural toilet renovation in various places, especially the collapsible loess geology in cold and arid northern regions of our country.

[0003] At present, there are problems with unreasonable structural design in the septic tanks used for rural toilets. First of all, the current ones are made by the injection molding process of splicing two halves. The tank body is divided into upper and lower parts. After laying a layer of rubber strip or applying glue at the joint, it is connected and fixed with screws and nuts. There are situations such as improper installation, terrain subsidence, and screw rust, which are prone to cause leakage of the tank body. Secondly, the connection ports between the septic tank body and the pipelines are all set horizontally on the side. There are not only serious leakage hazards at the connection between the tank body and the pipelines, which are dirty, smelly, and pollute environmental hygiene, but also a risk of polluting groundwater; moreover, the connection between the pipeline and the tank body bears a large vertical soil pressure, which will greatly affect the service life of the pipeline. Thirdly, the lateral connection of the pipeline will form a downward bend angle, which is prone to sedimentation of fecal sewage, blockage of the pipeline, easy freezing in winter, and will also affect normal cleaning and increase the construction volume. Moreover, the existing earthenware septic tanks have insufficient strength and poor load-bearing and compressive performance. When buried below the frozen soil layer, problems such as depression, deformation, and cracking are likely to occur. In addition, the waist size of the earthenware body is large and the upper and lower body shapes are tall, resulting in a large floor area of the earthenware body, a large amount of earthwork excavation and landfill, and low internal volume utilization rate. Finally, in the northern region of our country, the winter is long, the climate is cold, and the environmental temperature is low. When the indoor temperature of the toilet is below zero degrees, the fecal water retained in the toilet bowl and pipeline is likely to freeze; even the septic tank and the fecal inlet pipe may freeze, which not only affects the normal use of the toilet, but also affects the layering and fermentation effect of feces. Therefore, it is urgent to innovate the structure of the existing septic tank to solve the above technical problems. Summary of the Invention

[0004] In view of the above technical problems, the present invention provides an earthenware septic tank for rural sanitary toilets, which can effectively solve the technical problems existing due to unreasonable structure, such as easy leakage, easy sedimentation and blockage, insufficient strength of the earthenware body, easy depression, deformation and cracking, large floor area of the earthenware body, low utilization rate of the internal volume and easy freezing.

[0005] The present invention is achieved through the following technical solutions:

[0006] An earthenware septic tank for rural sanitary toilets includes an earthenware body. An inlet for feces and an outlet are respectively provided at the upper part of the earthenware body. The inlet for feces and the outlet are vertically upwardly opened along both sides of the earthenware body in the axial direction. The inlet for feces is connected to a toilet through a feces inlet pipe, and the outlet is used for discharging fecal sewage or connecting to the next-level septic tank through a connecting pipe.

[0007] Preferably, the feces inlet pipe and the connecting pipe are respectively connected to the inlet for feces and the outlet by an inner plug direct insertion connection.

[0008] Preferably, the earthenware body is an integral closed container composed of a bottom cylindrical barrel and an upper conical transition section.

[0009] Preferably, a plurality of annular grooves are uniformly distributed on the inner wall of the earthenware body. The annular grooves protrude outward and form uniform annular ribs on the outer wall of the earthenware body.

[0010] Preferably, the thickest point of the convex wall thickness of the annular rib ≥ 7.0 mm, and the thinnest point of the concave wall thickness adjacent to the annular rib ≥ 2.0 mm.

[0011] Preferably, longitudinal reinforcing ribs are uniformly distributed on the outer wall of the earthenware body. Among them, the bearing surface of the longitudinal reinforcing ribs located on the bottom cylindrical barrel is lower than the bearing surface of the annular rib, and the bearing surface of the longitudinal reinforcing ribs located on the upper conical transition section is higher than the bearing surface of the annular rib.

[0012] Preferably, a cleaning port is provided at the top of the earthenware body. A heat preservation pipe is connected to the cleaning port. The heat preservation pipe is vertically communicated with the earthenware body. The top of the heat preservation pipe is sealed and an exhaust pipe is connected to its side.

[0013] Preferably, the vertical length of the heat preservation pipe is greater than or equal to the thickness of the frozen soil layer where the septic tank is buried.

[0014] Preferably, the earthenware body is manufactured by a rotational molding one-piece forming process.

[0015] Preferably, the earthenware body can be assembled into a double-urn or triple-urn or tank-urn multi-stage septic tank through a connecting pipe.

[0016] The beneficial effects of the present invention are:

[0017] 1. By changing the fecal inlet and outlet of the septic tank from the lateral position to the vertically upward position, on the one hand, it can prevent serious leakage at the connection between the urn body and the pipeline, greatly eliminate the vertical soil pressure on the pipeline, and ensure the service life of the pipeline; on the other hand, it can avoid the formation of a downward bend angle at the pipeline connection, thus preventing pipeline blockage caused by sedimented fecal sewage. And setting the opening upward does not affect the normal cleaning of fecal sewage, ensuring the operation efficiency.

[0018] 2. The urn body consists of a bottom cylindrical barrel and an upper conical transition section to form an integrated sealed container. Compared with the existing urn - type septic tank, it has a large effective volume, a small amount of excavated soil, and a shallow burial depth, solving the problems of large floor area of the urn body, large amount of deep - excavated soil during burial, and low internal volume utilization rate; and to a certain extent, it improves the installation stability and bearing capacity of the septic tank.

[0019] 3. Through the uniformly distributed annular ribs (i.e., inner - wall annular grooves) on the outer wall of the urn body, in view of the large lateral and axial stresses borne by the septic tank, it can greatly improve the compressive capacity and ring stiffness of the septic tank, making it not easy to dent, deform, or crack; and the convex surface of the annular rib is the bearing surface, with the thickest wall thickness point ≥ 7.0 mm, while the concave surface adjacent to the annular rib is the non - bearing surface, with the thinnest wall thickness point ≥ 2.0 mm. This structure makes the edge strength of the urn body good, the compressive strength high, and the overall structure stress prominent; in addition, the sewage flows into the tank in a circulating manner, which can play a certain stirring role, is conducive to the stratification of fecal sewage in the tank, and improves the microbial treatment effect, making the sewage treatment capacity of the present invention significantly higher than that of traditional septic tanks of the same volume.

[0020] 4. By setting the insulation pipe, the length of which adapts to the frozen soil layers in different regions, it can not only solve the freezing of fecal liquid in the septic tank and pipeline; but also when it is buried underground, it can play a positioning role to prevent the lateral displacement of the septic tank with the terrain; and it can also adjust the internal air pressure of the septic tank and serve the purpose of increasing the capacity.

[0021] 5. The urn body is made by the rotational molding one - piece forming process. The product is formed without pressure, with good edge strength, high compressive strength, and is acid - alkali resistant and corrosion - resistant; it can overcome the problems of the existing septic tank made by the injection - molding two - half splicing process, which is easy to crack and leak and is not suitable for collapsible loess areas prone to collapse.

[0022] 6. The structure is reasonable, the effect is remarkable, with good market benefits and economic prospects, and is suitable for popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of the urn - type septic tank for rural sanitary toilets of the present invention;

[0024] Figure 2 It is a schematic structural diagram of the urn body in the present invention;

[0025] Figure 3 This is the side view of the urn body in the present invention;

[0026] In the figure: 1-urn body, 2-fecal inlet, 3-outlet, 4-fecal inlet pipe, 5-connecting pipe, 6-insulation pipe, 7-exhaust pipe, 8-bottom cylindrical barrel, 9-upper conical transition section, 10-annular groove, 11-longitudinal stiffening rib, 12-annular rib, 13-cleaning port. Specific embodiments

[0027] The present invention and its effects will be further described below in conjunction with the drawings and embodiments.

[0028] As Figures 1 - 3 shown, an urn-type septic tank for rural sanitary toilets includes an urn body 1. The upper part of the urn body 1 is respectively provided with a fecal inlet 2 and an outlet 3. Both the fecal inlet 2 and the outlet 3 are vertically upwardly opened along the axial directions on both sides of the urn body 1. The fecal inlet 2 is connected to a toilet through a fecal inlet pipe 4, and the outlet 3 is used for discharging fecal sewage or connecting to the next-level septic tank through a connecting pipe 5. In the present invention, the fecal inlet and the outlet on the septic tank are changed from lateral side positions to vertically upward openings. On the one hand, it can prevent serious leakage at the connection between the urn body and the pipeline, greatly eliminate the vertical soil pressure borne by the pipeline, and ensure the service life of the pipeline; on the other hand, it can avoid the formation of a downward bend angle at the pipeline connection, thereby preventing pipeline blockage caused by sedimentation of fecal sewage, and the upward opening setting will not affect the normal cleaning of fecal sewage, ensuring the operation efficiency. Moreover, the fecal inlet pipe 4 and the connecting pipe 5 are respectively connected to the fecal inlet 2 and the outlet 3 by an inner plug direct insertion connection. On the one hand, it can be freely assembled into a multi-stage septic tank in the form of a double-urn or triple-urn or tank-urn as needed, greatly improving the installation speed, meeting the needs of large-scale construction, and at the same time avoiding the problems of easy inversion and blockage of the pipelines of other septic tanks; on the other hand, due to the lateral horizontal connection of the pipelines in the existing septic tanks, the septic tanks can only be installed in a straight position, which has great limitations. The present invention can flexibly arrange the installation position and angle between the septic tanks according to the actual situation.

[0029] Furthermore, the urn body 1 is composed of a bottom cylindrical barrel 8 and an upper conical transition section 9 to form an integral sealed container. Compared with the existing urn-type septic tank, it has a large effective volume, small excavation volume of soil, and shallow burial depth, solving the problems of large floor area of the existing urn body, large excavation volume of soil during burial, and low internal volume utilization rate. The bottom cylindrical barrel 8 can improve the installation stability of the septic tank to a certain extent, and the upper conical transition section 9 can greatly improve the pressure-bearing capacity. A number of annular grooves 10 are evenly distributed on the inner wall of the urn body 1. The annular grooves 10 protrude outward and form uniform annular ribs 12 on the outer wall of the urn body 1. The arc radius of the annular ribs 12 is 10-100 mm, and the height of the annular ribs 12 is 20-200 mm. On the one hand, it can greatly improve the compressive strength and ring stiffness of the septic tank, and it is not easy to dent, deform, or crack; on the other hand, the sewage flows into the tank in a circulating manner, which can play a certain stirring role, is beneficial to the stratification of feces and sewage in the tank, and improves the microbialization effect, making the sewage treatment capacity of the present invention significantly higher than that of traditional septic tanks of the same volume. Among them, the convex surface of the annular rib is the pressure-bearing surface, and the thickest point of its wall thickness ≥ 7.0 mm, while the concave surface adjacent to the annular rib is the non-pressure-bearing surface, and the thinnest point of its wall thickness ≥ 2.0 mm. This structure makes the edge strength of the urn body good and the compressive strength high, and the overall structure stress is highlighted.

[0030] To further improve the stiffness and pressure-bearing capacity of the urn body, longitudinal reinforcing ribs 11 are also evenly distributed on the outer wall of the urn body 1. Among them, the pressure-bearing surface of the longitudinal reinforcing ribs 11 located on the bottom cylindrical barrel 8 is lower than the pressure-bearing surface of the annular ribs 12. The longitudinal reinforcing ribs 11 at this position are mainly used to resist the internal pressure of the urn body, while the annular ribs 12 are mainly used to bear the external pressure; the pressure-bearing surface of the longitudinal reinforcing ribs 11 located on the upper conical transition section 9 is higher than the pressure-bearing surface of the annular ribs 12. The longitudinal reinforcing ribs 11 and the annular ribs 12 at this position form a triangular load-bearing surface, greatly strengthening the pressure-bearing capacity of the shoulder of the urn body, increasing the burial depth of the urn body, and the protruding longitudinal reinforcing ribs 11 can effectively prevent the deformation of the annular ribs 12.

[0031] Furthermore, a cleaning port 13 is provided at the top of the urn body 1 for cleaning feces and sewage or checking the situation inside the tank. A heat preservation pipe 6 is connected to the cleaning port 13. The heat preservation pipe 6 is vertically connected to the urn body 1. The top of the heat preservation pipe 6 is sealed and an exhaust pipe 7 is connected to its side. By setting the heat preservation pipe 6, the vertical length of the heat preservation pipe 6 is greater than or equal to the thickness of the frozen soil layer where the septic tank is buried, so that the urn body 1 is located below the frozen soil layer, which can not only solve the freezing of fecal liquid in the septic tank and pipeline, saving the process and cost of adding a heat preservation layer on the ground; moreover, when the heat preservation pipe 6 is buried underground, it can play a positioning role, effectively slowing down the lateral displacement of the septic tank along with the terrain, and can also adjust the internal air pressure of the septic tank and achieve the purpose of increasing the capacity. The odor in the septic tank gathers upward in the heat preservation pipe 6 and is discharged by the exhaust pipe 7. The outer diameter of the exhaust pipe 7 uses a 110 mm pipe, and the height should exceed the toilet roof by at least 50 cm, and right-angle turning should be avoided.

[0032] The urn body 1 is made by the rotational molding one-piece forming process, and the raw material is polyethylene polymer material resin. The product is formed without pressure, with uniform wall thickness, good edge strength, high compressive strength, acid and alkali resistance, corrosion resistance, and is not easy to dent, deform or crack; it can overcome the problems of the existing septic tanks made by the injection molding two-half splicing process, which are easy to crack and leak and cannot be applied to the collapsible loess areas prone to subsidence. Compared with the existing septic tanks, the present invention is a standardized monomer without partitions inside the tank, overcoming the problems of poor partition sealing and poor fecal harmlessness effect commonly existing in the existing septic tanks, and can truly realize the harmless treatment of fecal sewage.

[0033] The effective volume of the urn-type septic tank can be calculated according to the total fecal excretion volume of the household population and the water consumption of the flushing toilet at 2L / (person·day) and the sum of the water added before use at 1 / 3 of the total volume. It is required that the feces must be stored in the previous septic tank for more than 30 days. The specifications are mainly divided into 0.2 m³, 0.5m³, 0.75m³, 1.0m³, 1.5m³, 2.0m³, 3.0m³, 5.0m³, 10 m³......500 m³, etc. It can be used alone with one urn body or combined into multi-stage septic tanks of different specifications. It overcomes the problems of small capacity and single selectivity of other septic tank products.

[0034] The above embodiments are only exemplary and will not limit the present invention. It should be pointed out that for those skilled in the art, under the technical inspiration provided by the present invention, other equivalent variations and improvements made should be regarded as the protection scope of the present invention.

Claims

1. An earthenware septic tank for rural sanitary toilets, comprising an earthenware body, wherein a fecal inlet (2) and an outflow port (3) are respectively arranged on the upper part of the earthenware body, and it is characterized in that: The feces inlet (2) and the outflow port (3) are vertically opened upward along the axis of the urn body (1). The feces inlet (2) is connected to the toilet through a feces inlet pipe (4). The outflow port (3) is used for discharging fecal sewage or connecting to the next-level septic tank through a connecting pipe (5). The feces inlet pipe (4) and the connecting pipe (5) are respectively connected to the feces inlet (2) and the outflow port (3) by an inner plug direct insertion connection; a plurality of annular grooves (10) are evenly distributed on the inner wall of the urn body (1). The annular grooves (10) protrude outward and form uniform annular ribs (12) on the outer wall of the urn body (1); the arc radius of the annular ribs (12) is 10-100 mm, the height is 20-200 mm, the thickest point of the convex wall thickness of the annular ribs (12) ≥ 7.0 mm, and the thinnest point of the concave wall thickness adjacent to the annular ribs (12) ≥ 2.0 mm; the urn body (1) is an integral closed container composed of a bottom cylindrical barrel (8) and an upper conical transition section (9); longitudinal reinforcing ribs (11) are evenly distributed on the outer wall of the urn body (1). The bearing surface of the longitudinal reinforcing ribs (11) located on the bottom cylindrical barrel (8) is lower than the bearing surface of the annular ribs (12), and the bearing surface of the longitudinal reinforcing ribs (11) located on the upper conical transition section (9) is higher than the bearing surface of the annular ribs (12).

2. The urn-type septic tank for rural sanitary toilets according to claim 1, wherein: A cleaning port (13) is provided at the top of the urn body (1). A heat preservation pipe (6) is connected to the cleaning port (13). The heat preservation pipe (6) is vertically communicated with the urn body (1). The top of the heat preservation pipe (6) is sealed and an exhaust pipe (7) is connected to its side. The height of the exhaust pipe (7) should exceed the toilet roof by at least 50 cm.

3. The urn - type septic tank for rural sanitary toilets according to claim 2, characterized in that: The vertical length of the heat preservation pipe (6) is greater than or equal to the thickness of the frozen soil layer where the septic tank is buried.

4. The urn - type septic tank for rural sanitary toilets according to claim 1, wherein: The urn body (1) is made by a rotational molding one-piece forming process.

5. The urn - type septic tank for rural sanitary toilets according to claim 1, characterized in that: The urn body (1) can be assembled into a double-urn or triple-urn multi-stage septic tank through the connecting pipe (5).

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