阅读说明：本技术 基坑降水自动启停装置 (Automatic start and stop device for foundation pit dewatering ) 是由 张永伟 孔维龙 韩美增 李香振 杜永刚 孔玉花 江姣姣 韩自颖 于 2020-07-28 设计创作，主要内容包括：本发明属于基坑降水施工技术领域,特别是涉及一种基坑降水自动启停装置。随着降水工作的推进,单位时间的渗水量慢慢减少,但是单位时间内水泵抽水的量是一定的,一定时间内水泵无水可抽,水泵空转导致损坏基坑降水自动启动装置,压力传感器感应到水位的升高或降低,压力传感器传出相应的信号后,中间继电器根据相应信号动作,闭合或切断水泵控制线路进而启动或停止水泵运转。基坑降水施工过程中,使用该自动启停装置,可以自动控制降水水泵的运转或停止运转,提高降水效率,减少施工人员工作量,提升降水效果。(The invention belongs to the technical field of foundation pit dewatering construction, and particularly relates to an automatic start-stop device for foundation pit dewatering. Along with the propulsion of precipitation work, the infiltration volume of unit interval slowly reduces, but the volume that the water pump drew water in unit interval is certain, and the water pump is anhydrous can be taken out in certain time, and the pump idle running leads to damaging foundation ditch precipitation automatic start device, and pressure sensor senses the rising or the reduction of water level, and after pressure sensor transmitted corresponding signal, the auxiliary relay acted according to corresponding signal, closed or cut off water pump control circuit and then started or stopped the water pump operation. In the foundation ditch precipitation work progress, use this automation to open and stop the device, the operation or the stall that can automatic control precipitation water pump improve precipitation efficiency, reduce constructor work load, promote precipitation effect.)

1. The utility model provides an automatic device that stops that opens of foundation ditch precipitation, characterized by: the pressure sensor senses pressure change generated by that the water level in the motor shaft rises to a certain height, the pressure sensor can transmit signals, an intermediate relay connected with the pressure sensor generates state change because of the signals, the state change of the intermediate relay can cause the normally open contact of the intermediate relay to be closed, the normally open contact of the intermediate relay is connected in series with a control circuit of the water pump, the closing of the normally open contact of the intermediate relay triggers the control circuit of the water pump to be switched on, the switched-on control circuit controls the main circuit of the water pump to be switched on, and the main circuit of the water pump is switched on to control the water pump to operate;

as the water pump operates, water in the motor well is pumped out of the motor well, the water level in the motor well slowly decreases, after the water level in the motor well decreases to a certain degree, the pressure sensor transmits a signal, an intermediate relay connected with the pressure sensor generates a state change because of the signal, the state change of the intermediate relay can cause a normally open contact of the intermediate relay to be opened, the normally open contact of the intermediate relay is connected in series with a control circuit of the water pump, the opening of the normally open contact of the intermediate relay causes the control circuit of the water pump to be electrically disconnected and opened, the control circuit after being electrically disconnected breaks a main circuit of the water pump, and the main circuit of the water pump after being disconnected is electrically disconnected causes the water pump to stop operating;

after the water pump stops operating, the water level in the motor well rises due to the existence of underground water, and the pressure sensor senses the pressure change generated when the water level rises to a certain height, so that the process is repeated.

2. The automatic start and stop device for foundation pit dewatering of claim 1, wherein: the water level refers to the level of the permeate water collected in the well.

3. An automatic start and stop device for foundation pit dewatering according to claim 1 and claim 2, wherein: after the seepage water is pumped out of the motor-pumped well, the foundation pit water level is slowly reduced.

4. An automatic start and stop device for foundation pit dewatering according to claim 1, claim 2 and claim 3, characterized in that: the motor-pumped well is arranged around the foundation pit or at a set position.

5. The automatic start and stop device for foundation pit dewatering of claim 1, wherein: the water pump can be a single-phase water pump or a three-phase water pump.

6. The pressure sensor can be wired, wireless or other.

7. The automatic start and stop device for foundation pit dewatering of claim 1, wherein: the intermediate relay plays a role of a switch, and after the intermediate relay receives the signal, the state of the intermediate relay changes.

Technical Field

The invention belongs to the technical field of foundation pit dewatering construction, and particularly relates to an automatic start-stop device for foundation pit dewatering.

Background

The foundation pit dewatering refers to the dewatering work which is performed for ensuring that the foundation pit can be constructed under the dry condition and preventing the instability of a side slope, the basic quicksand, the pit bottom uplift, the pit bottom piping and the reduction of the bearing capacity of a foundation.

The foundation pit dewatering method mainly comprises the following steps: open ditches are added with water collecting well dewatering, light well point dewatering, jet well point dewatering, electroosmosis well point dewatering, deep well point dewatering and the like; no matter which method is used for precipitation, a water pumping device is required, namely, the water pump cannot be started.

The final purpose of precipitation is to reduce the groundwater level to a certain range below the excavation bottom surface, and in the foundation pit precipitation propulsion process, the concrete expression is that seepage water is continuously pumped out until the water level is reduced to the expected requirement; the most ideal water pumping state is that the continuous seepage water is pumped away continuously, the seepage water amount in unit time and the water pumping amount in unit time are kept balanced, and the water pump keeps a continuous working state; in the actual precipitation process, the water pumping amount in unit time is always larger than the water seepage amount in unit time, the difference value between the water pumping amount in unit time and the water seepage amount in unit time is continuously increased along with the propulsion of precipitation work, and the water level is reduced, so that the water seepage amount is temporarily and completely pumped after the water pump works for a period of time, at the moment, the water pump can pump no water, but the water pump still runs, and the water pump motor is possibly burnt out to cause the damage of the water pump if the water pump idle time exceeds a certain time and is not found; in order to avoid the water pump damage caused by the condition, the inspection force is increased in the construction process, measures are taken in time when the water pump water yield is reduced, but the inspection interval is too large or the inspection is not strong, particularly the inspection difficulty is increased or the inspection times are reduced at night, and the like, so that the water pump damage probability is greatly increased, the damage is maintained, the construction cost is increased, the damage is replaced, the foundation pit precipitation is suspended, and the foundation pit precipitation efficiency is reduced.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an automatic start-stop device for foundation pit dewatering, which can automatically stop the operation of a water pump when the seepage collected in a motor well can not meet the operation requirement of the water pump; after the collected seepage reaches a certain requirement, the water pump is automatically started to pump water, so that the probability of damage caused by the idling of the water pump is reduced

The technical scheme for realizing the purpose is as follows:

the invention provides a foundation pit dewatering automatic start-stop device, which comprises a pressure sensor and an intermediate relay, wherein the intermediate relay is connected into a water pump control circuit; the water level changes to cause the pressure change sensed by the pressure sensor, the result of different pressure changes is that the signal transmitted by the pressure sensor changes, the signal transmitted by the pressure sensor changes to cause the working state of the intermediate relay to change, the on-off state of the water pump control circuit is changed by changing the working state of the intermediate relay, the on-off state of the water pump control circuit changes to cause the on-off state of the main circuit of the water pump to change, and then the purpose of automatically starting and stopping the water pump is achieved.

A pressure sensor is arranged, when the water level rises to a certain height, certain water pressure is generated, the pressure sensor transmits a signal after sensing the pressure change, the state of the intermediate relay is changed after the signal reaches the intermediate relay, the intermediate relay acts, the state of the intermediate relay is changed, a normally open contact is driven to be closed, the normally open contact is connected in series in a water pump power control circuit, the water pump power control circuit is connected after the normally open contact is closed, the connected control circuit controls the closing of a main circuit of a water pump, the water pump starts to work after the main circuit is closed, and the permeated water exceeding a certain water level is pumped out through the water pump; the method comprises the following steps that (1) seepage water is collected continuously, a water pump pumps the collected seepage water away continuously, when the pumping speed of the water pump is higher than the seepage speed, the collected water level is reduced slowly, when the water level is reduced to a certain degree, a pressure sensor cannot sense the existence of water pressure, the pressure sensor stops transmitting signals, an intermediate relay cannot receive the signals, the state of the intermediate relay is changed, the state is recovered, a normally open contact is reset and disconnected, a normally open contact connected in series with a power control circuit of the water pump is disconnected after the normally open contact of the power control circuit of the water pump is disconnected, a main circuit of the water pump is disconnected after the power control; the seepage water is collected slowly and continuously, the water level rises slowly, the pressure is increased, the pressure sensor transmits signals, and the operation is repeated in such a way.

The invention has the beneficial effects that: as long as the water level in the motor well is higher than a certain degree, the water pump can work all the time to pump water, so that the continuity of precipitation work is ensured; when the water level in the machine well is lower than a certain degree and the water pump is possibly damaged if the water pump continuously operates, the control circuit is automatically disconnected, then the main circuit of the water pump is disconnected, and the water pump stops operating; when the water level in the machine well is restored to a certain degree, the water pump can be automatically started to perform precipitation operation; the water pump is not only ensured not to be damaged due to no water being pumped, but also the seepage water is ensured to be pumped away by the water pump in time after being collected to a certain degree, the precipitation efficiency is improved, and the precipitation effect is improved; the number of times of tour of constructors is reduced, even personnel are not needed to take care of, the damage probability of the water pump is reduced, and the maintenance workload can be reduced to the minimum.

Drawings

FIG. 1: and the automatic start-stop device is provided with a circuit control diagram.

FIG. 2: the structure of the automatic start-stop device is schematically shown.

In the figure: 1-signal and/or power lines of the pressure sensor; 2: a pressure sensor; 3-a water pump; 4-a water pump power line; and 5, water outlet of the water pump.

Detailed Description

In order to make the technical solutions of the present invention more clear and definite for those skilled in the art, the present invention is further described below with reference to the following examples and drawings, but the embodiments of the present invention are not limited thereto.

As shown in fig. 1-2, the present embodiment includes a pressure sensor and a signal line and/or a power line of the pressure sensor, an intermediate relay and a normally open contact of the intermediate relay, a water pump, a main line of the water pump and a control line of the water pump, wherein the normally open contact of the intermediate relay is connected in series in the control line, 1 is the signal line and/or the power line of the pressure sensor, is a part of the pressure sensor, and is listed in single column for convenience of description; 2 is a pressure sensor schematic; 3 is a water pump; 4 is a power circuit of the water pump, is an essential part of the water pump, and is listed out for convenience of description; 5 is the water outlet of the water pump and is an indispensable part of the water pump, different water pumps can be arranged at different positions, and the water pumps are listed for convenience of description.

The water flows to the depression part due to the natural characteristic, underground water around the motor-pumped well is slowly collected in the motor-pumped well, the water level in the motor-pumped well slowly rises, the pressure sensor senses the pressure of the rising water level and then transmits the pressure to the intermediate relay through a signal wire of the pressure sensor, the state of the intermediate relay is changed, the normally open contact of the intermediate relay acts and is closed, the normally open contact of the intermediate relay is connected with a water inlet pump control circuit in series, the closed normally open contact is connected with a water pump control circuit, and then the water pump main circuit is connected, and the water pump starts to operate and pump water; the water level in the motor-pumped well is continuously reduced along with the continuous pumping of the water in the motor-pumped well, until the pressure sensor can not sense the water level pressure, the pressure sensor transmits a signal to the intermediate relay, the intermediate relay resets, the normally open contact is disconnected, the water pump control circuit is disconnected, the water pump main circuit is disconnected, and the water pump stops pumping; the underground water around the motor-pumped well continuously infiltrates into the motor-pumped well, the water level in the motor-pumped well is gradually increased, the process is repeated, and the purpose of automatically starting and stopping the foundation pit dewatering is achieved.

Furthermore, the pressure sensor is fixed at one position, the pressure sensor senses the pressure generated by the change of the water level, the water level is reduced, and the pressure sensed by the pressure sensor is reduced until no pressure exists; when the water level rises, the pressure sensed by the pressure sensor becomes larger and exceeds a certain critical value, and the pressure sensor outputs a signal to the intermediate relay through a signal wire of the pressure sensor.

Further, the pressure sensor can be arranged on the top surface, the upper part, the middle part or the lower part of the surface of the water pump, or can be arranged at the position of a terminal of a water pump control circuit on the water pump or other positions near the water pump, the pressure sensor is shown to be arranged on the top surface of the water pump, and the pressure sensor can also be arranged at other positions.

Further, the signal line of the pressure sensor in this embodiment is also only an example, and may be wired, wireless or in other forms when actually used; the wired connection may be two, three, four or some other number of wires; the pressure sensor signal line can be a signal line only, can also be composed of a signal line and a power line, and can also be composed of a signal line and other types of lines which are all integral parts of the sensor.

Furthermore, when no signal is input into the intermediate relay, the intermediate relay keeps the original state, the normally open contact is opened, and the normally closed contact is closed; when the signal is input, the intermediate relay acts, the normally open contact is closed, and the normally closed contact is opened.

Further, this embodiment is a three-phase water pump as an example, and the water pump may be a single-phase or three-phase water pump.

Furthermore, in order to prevent the water pump from being started and stopped frequently due to water level change, a time delay device can be added in the actual construction process; the water pump is started in a delayed manner after the water level exceeds a certain degree, so that the long-time operation of the water pump is ensured as much as possible, and the starting and stopping times are reduced under the condition of ensuring the precipitation effect; stopping when the water level is lower than a certain degree in a delayed manner, and pumping away a part of the seepage water in the motor-pumped well as much as possible, so as to reduce the starting and stopping times and lay a foundation for collecting more seepage water next time; or according to different water seepage conditions, water pump power and field reality, set up the pressure value that different open stops the water pump, both will satisfy the precipitation requirement, reduce simultaneously and open and stop the number of times as far as possible.

The above description is only for the purpose of illustrating the present invention and is not intended to limit the scope of the present invention, and any person skilled in the art can substitute or change the technical solution of the present invention and its conception within the scope of the present invention.