Gas circuit control system for underground pipe networks and septic tank hazardous gas concentration monitoring equipment

Abstract

The present invention relates to the field of underground pipe networks and septic tank control technology, specifically to an air circuit control system for underground pipe networks and septic tank hazardous gas concentration monitoring equipment. The system comprises a main control device, an air-water separation device, an air collection port, an air circuit switching device, a vacuum pump, and biogas equipment. The air circuit switching device comprises a first multi-way solenoid valve and a second multi-way solenoid valve. The first multi-way solenoid valve comprises at least two air inlets and one air outlet, and the second multi-way solenoid valve comprises at least one air inlet and two air outlets. The air inlet of the first multi-way solenoid valve is respectively connected to the air collection port and the air-water separation device, the air outlet of the first multi-way solenoid valve is connected to the vacuum pump, the other end of the vacuum pump is connected to the air inlet of the second multi-way solenoid valve, and the air outlet of the second multi-way solenoid valve is respectively connected to the air-water separation device and the biogas equipment. The main control device is electrically connected to the air circuit switching device and the vacuum pump. This technical solution can automatically switch the air circuit to achieve different operations.

Description

Technical Field

[0001] The present invention relates to the technical field of underground pipe network and septic tank control, in particular to a gas path control system of underground pipe network and septic tank hazardous gas concentration monitoring equipment. Background Art

[0002] There are generally a variety of toxic or explosive dangerous gases in underground pipes and septic tanks, such as methane, ammonia, carbon monoxide, hydrogen sulfide, sulfur dioxide, etc. The existing technology extracts the gas in the underground pipes and septic tanks into the biogas equipment, and installs various monitoring sensors in the biogas equipment to form a detection gas chamber to monitor the concentration of dangerous gases.

[0003] Due to the high humidity of the gas, the moisture in the gas will cause various monitoring sensors to rust and be damaged and affect the detection accuracy; at the same time, the water level in the underground pipeline network and septic tank fluctuates greatly. When the rainfall is too heavy, it may even completely submerge the internal space, and the extracted gas is easily mixed with liquid.

[0004] Currently, there are some underground pipe networks and septic tank hazardous gas concentration monitoring equipment on the market, including gas-water separation devices, but the following problems still exist:

[0005] 1. When the accumulated water in the gas-water separation device reaches a certain amount, it needs to be discharged. In actual use, the accumulated water often enters the rear drying device or even the detection chamber due to failure to drain the water in time, causing detection failure or even device damage.

[0006] 2. Oil or foreign matter often floats on the water surface, which can easily cause the biogas collection port to be blocked, thereby causing gas line blockage. It is difficult to detect when the biogas collection port is blocked by foreign matter or oil, which will cause detection failure. At the same time, since the biogas collection port is set up inside the underground pipe network / septic tank, it is difficult to dredge it.

[0007] 3. The exhaust gas after testing is directly discharged into the atmosphere, which is likely to produce bad odor and seriously affect the lives of surrounding residents;

[0008] 4. There is no clean air collection function, so the sensor cannot be automatically zeroed and can only be zeroed manually. Summary of the Invention

[0009] The purpose of the present invention is to propose a gas path control system for underground pipeline networks and septic tank hazardous gas concentration monitoring equipment. This technical solution can automatically switch the gas path and realize different operations to address the above-mentioned problems.

[0010] To solve the above problems, the present invention provides a basic solution: a gas circuit control system for underground pipe networks and septic tank hazardous gas concentration monitoring equipment, including a main control device, a gas-water separation device, an air collection port, a gas circuit switching device, and a vacuum pump;

[0011] The gas-water separation device includes a first air vent, a second air vent, and a water outlet, wherein the first air vent is connected to the biogas collection port;

[0012] The gas path switching device includes a first multi-way solenoid valve and a second multi-way solenoid valve, the first multi-way solenoid valve includes at least two air inlet ends and one air outlet end, the second multi-way solenoid valve includes at least one air inlet end and two air outlet ends, the air inlet end of the first multi-way solenoid valve is respectively connected to the air collection port and the gas-water separation device, the air outlet end of the first multi-way solenoid valve is connected to the vacuum pump, the other end of the vacuum pump is connected to the air inlet end of the second multi-way solenoid valve, and the air outlet end of the second multi-way solenoid valve is respectively connected to the gas-water separation device and the biogas gas user;

[0013] The main control device is electrically connected to the gas path switching device and the vacuum pump.

[0014] Beneficial effects of the basic solution: The vacuum pump serves as a power source to enable biogas or air to flow; the main control device can control and adjust the working state of the multi-way solenoid valve, switch the air inlet end of the first multi-way solenoid valve and switch the air outlet end of the second multi-way solenoid valve to achieve switching of the air path.

[0015] When the air inlet of the first multi-way solenoid valve connected to the gas-water separation device and the air outlet of the second multi-way solenoid valve connected to the biogas equipment are in the open state, the gas path system can perform the "biogas collection" operation to ensure that the biogas can be smoothly collected into the biogas equipment.

[0016] When the air inlet end of the first multi-way solenoid valve connected to the air collection port and the air outlet end of the second multi-way solenoid valve connected to the gas-water separation equipment are in the open state, the air path system can pass the collected air into the gas-water separation equipment, forming a certain pressure in the gas-water separation equipment, and can perform an "air path backwash" operation to clear the air path of the biogas collection port, or perform a "drainage" operation to speed up the drainage and make the drainage more thorough.

[0017] When the air inlet end of the first multi-way solenoid valve connected to the air collection port and the air outlet end of the second multi-way solenoid valve connected to the biogas gas-using equipment are in the open state, the collected air can be passed into the biogas gas-using equipment. When the biogas gas-using equipment is a detection air chamber, the "zeroing" operation can also be achieved.

[0018] As a preferred solution, the biogas-using equipment is provided with an air inlet and an air outlet, and the air inlet of the detection chamber is provided with a multi-way connector.

[0019] The biogas is dispersed and introduced into the detection chamber through a multi-channel interface, allowing the biogas to enter more evenly, thereby improving the monitoring accuracy.

[0020] As a preferred solution, the gas-water separation device further includes a liquid level switch, and the height of the liquid level switch can be adjusted.

[0021] The liquid level switch can detect the water level in the gas-water separation device, facilitating timely drainage. The frequency of drainage can be adjusted by adjusting the height of the liquid level switch.

[0022] As a preferred solution, it further includes a host system, which is electrically connected to both the liquid level switch and the main control device.

[0023] The upper system can communicate with the main control device and provide power to the main control device. The liquid level switch can also communicate with the main control device through the upper system, so that the main control device can control the gas circuit switching after the liquid level reaches the set height, thereby realizing the automatic drainage function.

[0024] As a preferred solution, the gas-water separation device also has a built-in filter strip, the first air vent is arranged on the outside of the filter strip, the water outlet and the second air vent are arranged on the inside of the filter strip, and the bottle body of the gas-water separation device is made of transparent PET material.

[0025] The filter strip can separate the liquid that may be mixed in the gas, and at the same time prevent impurities from entering the rear gas path or blocking the drain outlet; the bottle body of the gas-water separation device is made of transparent PET material, which is convenient for observing the amount of impurities in the bottle and cleaning them in time.

[0026] As a preferred solution, a drying device is further included, wherein vents are respectively provided at the top and bottom of the drying device, the drying device is connected in series between the gas path switching device and the gas-water separation device, the drying device has a built-in desiccant, and flame-retardant filter sponges are provided around the desiccant, and the bottle body of the drying device is made of transparent PET material.

[0027] The drying device can further absorb moisture in the biogas. The desiccant is surrounded by flame-retardant filter sponges. The vent design allows the gas to pass through the drying device and fully dry the gas. The bottle of the drying device is made of transparent PET material, which allows the use of the desiccant to be observed and facilitates the replacement of the desiccant.

[0028] As a preferred embodiment, the gas circuit switching device also includes a third multi-way solenoid valve, which includes at least two air inlet ends and one air outlet end. The air inlet end of the third multi-way solenoid valve is respectively connected to the water outlet of the gas-water separation device and the air outlet end of the biogas use device, and the air outlet end of the third multi-way solenoid valve is connected to the drain / exhaust port.

[0029] The gas outlet of the biogas device and the drain outlet of the gas-water separation device can be finally merged and introduced into a unified drain / exhaust outlet, making the system structure more compact and easier to manage.

[0030] As a preferred solution, the drain / exhaust port has a check design, and the check design adopts a one-way valve.

[0031] Prevent moisture or liquid from flowing back through drain / vents in underground pipe networks or septic tanks. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural diagram of the gas circuit control system of the underground pipe network and septic tank hazardous gas concentration monitoring equipment;

[0033] Figure 2 This is a gas path diagram of the system when performing the "biogas collection" operation;

[0034] Figure 3 This is a gas path diagram of the system when performing the "gas path backflush" operation;

[0035] Figure 4 This is a gas path diagram of the system when performing the "drainage" operation;

[0036] Figure 5 This is a gas path diagram of the system when performing the "zero adjustment" operation;

[0037] Figure 6 This is the structural diagram of the gas-water separation device in this system;

[0038] Figure 7 This is the structural diagram of the drying device in this system. DETAILED DESCRIPTION

[0039] The technical solution of this application is further described in detail below through specific implementation methods:

[0040] The names of the corresponding symbols in the accompanying drawings are:

[0041] First multi-way solenoid valve 1, second multi-way solenoid valve 2, third multi-way solenoid valve 3, first multi-way connector 4, second multi-way connector 5, liquid level switch 6, one-way valve 7, filter strip 8, first air vent 9, second air vent 10, drain port 11, third air vent 12, fourth air vent 13, flame retardant filter sponge 14.

[0042] In the description of the present invention, it should be noted that the terms "upper," "lower," and "outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and should not be construed as indicating or implying relative importance.

[0043] It should also be noted that, in the description of this invention, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood broadly. For example, they can refer to fixed, removable, or integrated connections; they can be mechanical (including various mechanical connection forms, such as couplings or gear pairs) or electrical connections; they can be direct or indirect through an intermediary, and they can also refer to internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this invention based on the specific circumstances.

[0044] Example 1

[0045] like Figure 1 As shown in the figure, the underground pipe network and septic tank hazardous gas gas circuit control system includes the upper system, main control device, biogas pretreatment device, gas circuit switching device, vacuum pump, and detection gas chamber. The connection between the above parts is the same as Figure 1 consistent.

[0046] The gas circuit switching device includes several multi-way solenoid valves. In this embodiment, the multi-way solenoid valves are direct-acting miniature three-way solenoid valves; the multi-way solenoid valves include a first multi-way solenoid valve 1, a second multi-way solenoid valve 2, and a third multi-way solenoid valve 3. The system also includes multi-way connectors for merging or splitting gas circuits. The multi-way connectors include a first multi-way connector 4 and a second multi-way connector 5. The first multi-way solenoid valve 1 and the third multi-way solenoid valve 3 have at least two air inlets and one air outlet, while the second multi-way solenoid valve 2 has at least one air inlet and two air outlets.

[0047] like Figure 1 As shown, the two air inlet ends of the first multi-way solenoid valve 1 are respectively connected to the air collection port and the first multi-way connector 4, and the air outlet end of the first multi-way solenoid valve 1 is connected to a vacuum pump. In this embodiment, the vacuum pump adopts an adjustable speed diaphragm vacuum pump product; the other end of the vacuum pump is connected to the air inlet end of the second multi-way solenoid valve 2, and the two air outlet ends of the second multi-way solenoid valve 2 are respectively connected to the first multi-way connector 4 and the biogas gas equipment. The biogas gas equipment includes a detection gas chamber. The other end of the biogas gas equipment is connected to an air inlet end of the third multi-way solenoid valve 3. In one embodiment, the second A second multi-way connector 5 is also provided on the air path before the multi-way solenoid valve 2 is connected to the detection air chamber, which can make the gas entering the detection air chamber more uniform and make the detection more accurate; the other air inlet end of the third multi-way solenoid valve 3 is connected to the gas-water separation device, and the air outlet end of the third multi-way solenoid valve 3 is connected to the drain / exhaust port, and the drain / exhaust port also has a check design. In order to prevent moisture or liquid inside the underground pipeline or septic tank from flowing back into the detection air chamber through the drain / exhaust port and causing damage to various sensors, in this embodiment, the check design adopts a valve-type one-way valve 7 product.

[0048] The first multi-way connector 4 is also connected to the gas-water separation device, which is provided with a liquid level switch 6. In this embodiment, the liquid level switch 6 preferably adopts a capacitive patch liquid sensing switch. The liquid level switch 6 is electrically connected to the upper system, and the upper system provides power for the liquid level switch 6. The liquid level switch 6 feeds back the liquid level switch signal to the upper system, and transmits the signal to the main control device through the upper system, so that the main control device can judge whether the liquid level in the gas-water separation device is too high and whether it is necessary to control the gas path switching device to perform a "drainage" operation, so as to automatically drain the water when the water level is too high to prevent the accumulated water from entering the rear device. Figure 6 As shown, the gas-water separation device also has a built-in filter strip 8. In this embodiment, the filter strip 8 is preferably made of PP filter cotton. A first air vent 9 is provided on the outside of the filter strip 8, and a water outlet and a second air vent 10 are provided on the inside of the filter strip 8. The first air vent 9 is connected to the biogas collection port, and the second air vent 10 is connected to the gas path switching device. The gas entering the gas-water separation device can separate the liquid that may be mixed after filtering, and at the same time prevent impurities from entering the rear gas path or clogging the drain outlet 11; the bottle body of the gas-water separation device is made of transparent PET material, which is convenient for observing the amount of impurities in the bottle and cleaning them in time.

[0049] It also includes a drying device, which is connected in series between the first multi-way connector 4 and the gas-water separation device. Figure 7 As shown, the drying device has a built-in desiccant. In this embodiment, silica gel desiccant is preferably used, which can further absorb moisture in the biogas. Flame-retardant filter sponges 14 are provided around the desiccant, and a second air vent 12 and a fourth air vent 13 are provided on the top and bottom respectively. Biogas enters at one end and exits at the other end, and can pass through the drying device for sufficient drying. The bottle body of the drying device is made of transparent PET material, and the color of the silica gel desiccant can be observed (from blue to red indicates excessive moisture absorption and needs to be replaced), which makes it convenient to replace the desiccant.

[0050] In this embodiment, the gas or water lines between the various parts are preferably connected by silicone hoses, the biogas collection port and the drainage / exhaust port are connected to the underground pipe network or the inside of the septic tank, and the air collection port is connected to the atmosphere.

[0051] In this embodiment, the main control device preferably uses a high-performance MCU from the HC32F460 series. The main control device is electrically connected to the host system and communicates via a 232 serial port. The host system also provides power to the main control device. The main control device is electrically connected to the vacuum pump, providing power and a PWM speed control signal to the vacuum pump. The vacuum pump feeds back speed and current signals to the main control device, and the presence of gas path blockage is determined by detecting the vacuum pump current value. The main control device is electrically connected to the multi-way solenoid valve, providing power to the multi-way solenoid valve and controlling its operating state and on / off state. The main control device can control the vacuum pump and the gas path switching device to switch between four operating gas paths: "biogas collection," "gas path backwash," "drainage," and "zeroing."

[0052] When the "biogas collection" operation is performed, the vacuum pump is running, the first multi-way solenoid valve 1 works in the normal position, the second multi-way solenoid valve 2 works in the normal position, and the third multi-way solenoid valve 3 works in the normal position. Figure 2 As shown, biogas enters from the biogas collection port, passes through the gas-water separation device and the drying device, is sent into the detection gas chamber, and is finally discharged from the drainage / exhaust port.

[0053] When the "gas line backflush" operation is performed, the vacuum pump is running, the first multi-way solenoid valve 1 works in the excitation state, the second multi-way solenoid valve 2 works in the excitation state, and the third multi-way solenoid valve 3 works in the normal position. Figure 3 As shown, air enters from the air collection port, passes through the drying device and the gas-water separation device and is discharged from the biogas collection port. This air path reversely transports the positive pressure generated by the vacuum pump back to the biogas collection port to clear the blockage point.

[0054] When the "drainage" operation is performed, the vacuum pump is running, the first multi-way solenoid valve 1 works in the excitation state, the second multi-way solenoid valve 2 works in the excitation state, and the third multi-way solenoid valve 3 works in the excitation state. Figure 4 As shown, the accumulated water inside the air-water separation device is discharged through the water outlet, and at the same time, air is sent into the air-water separation device from the air collection port to eliminate possible negative pressure and avoid poor drainage.

[0055] When various sensors are installed in the detection chamber of the biogas equipment, they need to be zeroed regularly. When the "zeroing" operation is performed, the vacuum pump is running, the first multi-way solenoid valve 1 works in the excitation state, the second multi-way solenoid valve 2 works in the normal position, and the third multi-way solenoid valve 3 works in the excitation state. Figure 5 As shown, air enters from the air collection port and is sent to the detection air chamber, and is finally discharged from the drain / exhaust port.

[0056] The main control device is also used to process gas concentration data collected by sensors, etc., to achieve real-time monitoring of hazardous gas concentrations in underground pipelines and septic tanks.

[0057] Example 2

[0058] This embodiment differs from the first embodiment in that the biogas utilization device further includes a mixing chamber for adjusting the biogas concentration to meet various applications. Because this gas path control system can collect both biogas and air, the main control device can control the operating state of the multi-way solenoid valve in the gas path switching device according to the target biogas concentration, allowing biogas and air to be introduced into the mixing chamber in corresponding proportions, thereby generating a mixed gas with the target biogas concentration. This mixed gas can then be introduced into other biogas utilization devices for use as fuel or for other purposes.

[0059] The above is only an embodiment of the present invention. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the field are aware of all common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. Gas circuit control system for underground pipe network and septic tank hazardous gas concentration monitoring equipment, characterized by: It includes main control device, air-water separation device, air collection port, air path switching device and vacuum pump; The gas-water separation device includes a first air vent, a second air vent, and a water outlet, wherein the first air vent is connected to the biogas collection port; The gas path switching device includes a first multi-way solenoid valve and a second multi-way solenoid valve, the first multi-way solenoid valve includes at least two air inlet ends and one air outlet end, the second multi-way solenoid valve includes at least one air inlet end and two air outlet ends, the air inlet end of the first multi-way solenoid valve is respectively connected to the air collection port and the gas-water separation device, the air outlet end of the first multi-way solenoid valve is connected to the vacuum pump, the other end of the vacuum pump is connected to the air inlet end of the second multi-way solenoid valve, and the air outlet end of the second multi-way solenoid valve is respectively connected to the gas-water separation device and the biogas gas user; The main control device is electrically connected to the gas circuit switching device and the vacuum pump; The main control device controls the vacuum pump and the gas circuit switching device to switch among the four operating gas circuits: biogas collection, gas circuit backwash, drainage and zeroing; During the biogas collection operation, the vacuum pump is running, the first multi-way solenoid valve is in the normal position, the second multi-way solenoid valve is in the normal position, and the third multi-way solenoid valve is in the normal position; biogas enters from the biogas collection port, passes through the gas-water separation device and the drying device, is sent to the detection gas chamber, and is finally discharged from the drain / exhaust port; When the gas circuit is backflushing, the vacuum pump is running, the first multi-way solenoid valve is working in the excitation state, the second multi-way solenoid valve is working in the excitation state, and the third multi-way solenoid valve is working in the normal position; air enters from the air collection port, passes through the drying device and the gas-water separation device, and is discharged from the biogas collection port; During drainage operation, the vacuum pump is running, the first multi-way solenoid valve is working in the excitation state, the second multi-way solenoid valve is working in the excitation state, and the third multi-way solenoid valve is working in the excitation state; the accumulated water inside the gas-water separation device is discharged through the water outlet, and at the same time, air is sent into the gas-water separation device from the air collection port; When performing zeroing operation, the vacuum pump runs, the first multi-way solenoid valve works in the excitation state, the second multi-way solenoid valve works in the normal position, and the third multi-way solenoid valve works in the excitation state; air enters from the air collection port and is sent to the detection air chamber, and finally discharged from the drain / exhaust port.

2. The gas circuit control system of the underground pipe network and septic tank hazardous gas concentration monitoring equipment according to claim 1 is characterized by: The biogas-using equipment is provided with an air inlet end and an air outlet end, and the air inlet end of the biogas-using equipment is provided with a multi-way connector.

3. The gas circuit control system for underground pipe network and septic tank hazardous gas concentration monitoring equipment according to claim 1, characterized in that: The gas-water separation device further comprises a liquid level switch, the height of which can be adjusted.

4. The gas circuit control system for underground pipe network and septic tank hazardous gas concentration monitoring equipment according to claim 3, characterized in that: It also includes an upper system, which is electrically connected to the liquid level switch and the main control device.

5. The gas circuit control system of the underground pipe network and septic tank hazardous gas concentration monitoring equipment according to claim 3 is characterized by: The gas-water separation device also has a built-in filter strip, the first vent is arranged on the outside of the filter strip, the water outlet and the second vent are arranged on the inside of the filter strip, and the bottle body of the gas-water separation device is made of transparent PET material.

6. The gas circuit control system for underground pipe network and septic tank hazardous gas concentration monitoring equipment according to claim 1, characterized in that: It also includes a drying device, which is respectively provided with vents at the top and bottom. The drying device is connected in series between the gas path switching device and the gas-water separation device. The drying device has a built-in desiccant, and flame-retardant filter sponges are provided around the desiccant. The bottle body of the drying device is made of transparent PET material.

7. The gas circuit control system for underground pipe network and septic tank hazardous gas concentration monitoring equipment according to claim 1, characterized in that: The gas path switching device also includes a third multi-way solenoid valve, which includes at least two air inlet ends and one air outlet end. The air inlet end of the third multi-way solenoid valve is respectively connected to the water outlet of the gas-water separation device and the air outlet end of the biogas gas equipment, and the air outlet end of the third multi-way solenoid valve is connected to the drain / exhaust port.

8. The gas circuit control system for underground pipe network and septic tank hazardous gas concentration monitoring equipment according to claim 7, characterized in that: The drain / vent has a non-return design, and the non-return design adopts a one-way valve.

Images