Automatic water replenishing protection structure of self-priming pump

Abstract

The utility model discloses an automatic water replenishing protection structure of a self-priming pump, which is characterized in that an electric contact pressure gauge is kept to be triggered and a first time relay is kept to be electrified for timing in a time period when the self-priming pump is started and cannot work normally due to water shortage of a pump body and the pressure in a water outlet pipe is relatively low, and a control circuit cuts off power supply of a motor after timing is completed, so that the motor is stopped; therefore, the self-priming pump is prevented from being burnt or damaged due to long-time idling or abnormal operation; besides, in the period when the second time relay finishes timing and the first time relay performs timing, the first electromagnetic valve and the second electromagnetic valve are opened, automatic water replenishing is performed on the pump body, and the self-priming pump is assisted to recover normal operation under the partial condition with light faults, so that the frequency of manual water replenishing and maintenance is reduced; if the self-priming pump cannot work normally through automatic water replenishing, the self-priming pump is stopped as well; the problem that the self-priming pump in a sewage treatment plant is easy to damage due to water shortage can be effectively solved, and the service life and the working stability of the self-priming pump can be improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of pumping device in mechanical engineering, concretely relates to a self-priming pump automatic water replenishing protection structure. BACKGROUND

[0002] The self-priming pump is widely applied in the sewage treatment plant, and the main reason is that the self-priming pump is allowed to be installed above the water pool due to its own design, which not only can reduce the mechanical failure caused by long-term underwater operation, but also can overhaul the pump body or motor by simply disassembling without emptying the water pool or diving operation, so that the work efficiency can be improved and the maintenance cost can be reduced.

[0003] When the self-priming pump is started for the first time, liquid is filled in the pump body through the water injection bolt interface of the self-priming pump, and the air in the pump body is discharged through the air outlet of the self-priming pump; in the sewage treatment plant, the installation position of the self-priming pump is mostly higher than the water intake position, and generally a one-way valve is arranged at the mouth of the water inlet pipe to avoid the water in the pump body flowing back and discharging through the water inlet pipe after the self-priming pump stops, so as to cause the self-priming pump to be unable to be normally started and operated again due to water shortage. However, it is found in actual use that due to the poor quality of the water in the sewage treatment plant, after the self-priming pump works for a long time, the water in the pump body will flow back and discharge after the self-priming pump stops due to the sealing failure of the water inlet pipe connection, the breakage of the pipe section immersed in sewage due to erosion, and the one-way valve being stuck by particles in sewage and unable to be closed, etc. When starting again, if the abnormal condition that the self-priming pump cannot normally discharge water is not observed in time, and the pump body is replenished with water through the air outlet and the water injection bolt interface, or the self-priming pump is cut off for maintenance, the self-priming pump is easy to be damaged and the motor is overheated and burned due to long-time idling. Therefore, in order to improve the service life and working stability of the self-priming pump in the sewage treatment plant, a structure capable of automatically replenishing water or cutting off power supply to protect the motor when the pump body is short of water needs to be designed. SUMMARY

[0004] In view of the above shortcomings of the prior art, the utility model aims at providing a self-priming pump automatic water replenishing protection structure to solve the technical problem that the self-priming pump in the sewage treatment plant is easy to be damaged due to water shortage, and to achieve the effect of improving the service life and working stability of the self-priming pump.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme:

[0006] The application discloses a self-priming pump automatic water supplement protection structure.

[0007] Further, the water injection bolt interface of the self-priming pump is connected with an automatic water supplement pipe, the exhaust port of the self-priming pump is connected with an automatic drainage pipe, and the automatic water supplement pipe and the automatic drainage pipe are respectively provided with electromagnetic valves which are electrically connected in the control circuit, and the control circuit keeps the electromagnetic valves open when the pressure switch is triggered.

[0008] Further, the pressure switch is an electric contact pressure gauge, the water injection bolt interface of the self-priming pump is connected with a manual water supplement pipe, the exhaust port of the self-priming pump is connected with a manual drainage pipe, and the manual water supplement pipe and the manual drainage pipe are respectively provided with manual valves.

[0009] Further, the control circuit comprises a main control circuit, a vice control circuit and a driving circuit for supplying power to the motor of the self-priming pump, the first end of the main control circuit is connected with a positive electrode of a power supply, the tail end is connected with a negative electrode of the power supply, the main control circuit is sequentially connected with a normally closed button switch, a normally open button switch, a contactor and a delay opening contact of a first time relay in series, the normally open main contact of the contactor is connected in series in the driving circuit, and the normally open auxiliary contact of the contactor is connected in parallel with the normally open button switch; the first end of the vice control circuit is connected between the normally open button switch and the contactor, and the tail end is connected with the negative electrode of the power supply, the vice control circuit comprises a water supplement control circuit and a loss prevention control circuit which are connected in parallel, the pressure switch comprises a single-pole double-throw contact and is electrically connected in the water supplement control circuit, the single-pole double-throw contact comprises a moving contact, a first static contact and a second static contact, the moving contact and the first static contact are kept connected when the pressure in the water outlet pipe is lower than the set value, the moving contact is connected with the first end of the vice control circuit, the tail end of the vice control circuit is connected with the first static contact through a first water supplement branch and connected with the second static contact through a second water supplement branch; the first water supplement branch comprises a first branch and a second branch which are connected in parallel, the first branch is connected with a normally closed contact of a second intermediate relay and a second time relay in series, the second branch is connected with a delay closing contact of the second time relay and a first intermediate relay in series, and the second intermediate relay is connected in series in the second water supplement branch; the normally open contact of the first intermediate relay and the first time relay are sequentially connected in the loss prevention control circuit, and the first electromagnetic valve and the second electromagnetic valve are located in the loss prevention control circuit and connected in parallel with the first time relay.

[0010] Further, the loss prevention control circuit is further provided with a third branch which is connected in parallel with the first time relay, the third branch is connected with a delay closing contact of the first time relay and an audible and visual alarm in series.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] 1, the self priming pump automatic water replenishment protection structure, start self priming pump, self priming pump because the pump body is short of water and can not work normally, the pressure in the water outlet pipe is lower in the time period, the electric contact pressure gauge keeps triggering, the first time relay keeps the electric timing, and the control circuit cuts off the motor power supply after timing is completed, so that the motor stops, thereby avoiding self priming pump from being burnt out or damaged due to long time idling or abnormal operation, can effectively solve the problem that self priming pump in sewage treatment plant is easily damaged due to water shortage, and is favorable to improve the service life and working stability of self priming pump.

[0013] 2, the self priming pump automatic water replenishment protection structure, through setting up automatic water replenishment pipe, automatic drain pipe, first electromagnetic valve and second electromagnetic valve, the control circuit is in the second time relay timing completion, the first time relay timing is in the period, controls first electromagnetic valve and second electromagnetic valve to open, and the pump body is automatically replenished with water, attempts to assist self priming pump to restore normal operation under the condition that the partial failure is lighter, so as to reduce the frequency of manual water replenishment and maintenance, and when automatic water replenishment still cannot make self priming pump work normally, also make self priming pump stop, thereby avoiding self priming pump from being damaged. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the schematic view of the self priming pump automatic water replenishment protection structure of the embodiment;

[0015] Figure 2 It is the wiring schematic diagram of the control circuit of the embodiment;

[0016] Among them, water body 1, check valve 2, inlet pipe 3, pump body 4, motor 5, water outlet pipe 6, electric contact pressure gauge 7, automatic water replenishment pipe 8, automatic drain pipe 9, first electromagnetic valve 10, second electromagnetic valve 11, manual water replenishment pipe 12, manual drain pipe 13, first manual valve 14, second manual valve 15, third manual valve 16, fourth manual valve 17. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the utility model embodiment more clear, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings in the utility model embodiment.

[0018] Embodiment:

[0019] Please see Figure 1The utility model discloses a self-priming pump automatic water replenishing protection structure, including self-priming pump and control circuit, and self-priming pump includes pump body 4 and motor 5, and motor 5 is connected with pump body 4 transmission, and pump body 4 has water inlet, water outlet, water injection bolt interface and exhaust port, and water inlet is connected with water inlet pipe 3, and the inlet end of water inlet pipe 3 is immersed in water body 1 and is equipped with check valve 2, and water outlet is connected with water outlet pipe 6, and water outlet pipe 6 is equipped with pressure switch near the water outlet of self-priming pump, and pressure switch detects the pressure in water outlet pipe 6, and in the embodiment, pressure switch adopts electric contact pressure gauge 7, electric contact pressure gauge 7 has set value and triggers when the pressure in water outlet pipe 6 is lower than set value, and electric contact pressure gauge 7 and motor 5 are electrically connected in control circuit, and still electrically connected with first time relay in control circuit, and control circuit makes first time relay be electrified timing when electric contact pressure gauge 7 triggers, and makes motor 5 stop after the timing of first time relay is completed, when the utility model is implemented, set value is reasonably arranged according to the water pressure of self-priming pump normal work, and ensures that electric contact pressure gauge 7 can trigger when self-priming pump does not work normally, and the length of time of the timing of first time relay should be greater than the time required for the normal start of self-priming pump to avoid misjudgment, and on this basis, the length of time of the timing of first time relay should be short to avoid self-priming pump from being burnt or damaged due to long time idling or abnormal operation.

[0020] The self-priming pump automatic water replenishing protection structure sets the electric contact pressure gauge 7 for detecting the pressure in the water outlet pipe 6, and connects the electric contact pressure gauge 7, the first time relay and the motor 5 of the self-priming pump into the control circuit. When the pressure in the water outlet pipe 6 is lower than the set value of the electric contact pressure gauge 7, the electric contact pressure gauge 7 is in the triggered state. At this time, the control circuit makes the first time relay keep electrified, and the first time relay starts timing. The control circuit makes the motor 5 stop after the timing of the first time relay is completed.

[0021] Please refer to Figure 1The water injection bolt interface of the self-priming pump is connected with an automatic water supplement pipe 8, the other end of the automatic water supplement pipe 8 is communicated with a pressure water source, the exhaust port of the self-priming pump is connected with an automatic water discharge pipe 9, the other end of the automatic water discharge pipe 9 is communicated with a water drain channel or returns to the pressure water source, the first electromagnetic valve 10 and the second electromagnetic valve 11 are respectively arranged on the automatic water supplement pipe 8 and the automatic water discharge pipe 9, the first electromagnetic valve 10 and the second electromagnetic valve 11 are electrically connected in the control circuit, and the control circuit makes the first electromagnetic valve 10 and the second electromagnetic valve 11 keep open when the electric contact pressure gauge 7 is triggered; in the embodiment, the third manual valve 16 is further arranged on the automatic water supplement pipe 8, the fourth manual valve 17 is further arranged on the automatic water discharge pipe 9, and the third manual valve 16 and the fourth manual valve 17 keep open in the normal state and are used for controlling the opening and closing of the automatic water supplement pipe 8 and the automatic water discharge pipe 9 when the first electromagnetic valve 10 and the second electromagnetic valve 11 are faulty.

[0022] In this way, when the self-priming pump is started, during the period when the self-priming pump does not normally operate due to water shortage of the pump body 4 and the pressure in the water outlet pipe 6 is low, the electric contact pressure gauge 7 keeps triggering, the control circuit not only makes the first time relay keep electrified timing, but also makes the first electromagnetic valve 10 and the second electromagnetic valve 11 keep open. After the first electromagnetic valve 10 and the second electromagnetic valve 11 are opened, the automatic water supplement pipe 8 introduces liquid into the pump body 4, and the automatic water discharge pipe 9 discharges air and excess liquid in the pump body 4, so as to realize automatic water supplement of the pump body 4 and promote the self-priming pump to resume normal operation under the condition that the water inlet pipe 3 is not damaged in a large area and the one-way valve 2 is not completely stuck, thereby reducing the frequency of manual water supplement and maintenance. Meanwhile, if the automatic water supplement still cannot make the self-priming pump resume normal operation and make the pressure in the water outlet pipe 6 reach the standard, the self-priming pump will also be stopped after the first time relay completes timing, thereby avoiding damage of the self-priming pump.

[0023] Please refer to Figure 1 The water injection bolt interface of the self-priming pump is connected with a manual water supplement pipe 12, the exhaust port of the self-priming pump is connected with a manual water discharge pipe 13, and the first manual valve 14 and the second manual valve 15 are respectively arranged on the manual water supplement pipe 12 and the manual water discharge pipe 13.

[0024] In this way, on the basis that the pressure switch adopts the electric contact pressure gauge 7, when the control circuit fails or the self-priming pump and the pipeline are maintained, the pressure in the water inlet pipe 3 can be directly mastered through the dial plate of the electric contact pressure gauge 7, when the pressure is low, the pump body 4 can be supplemented with water through manual operation of the first manual valve 14 and the second manual valve 15, and the practicability of the self-priming pump automatic water supplement protection structure is improved.

[0025] Please refer to Figure 2 In order to realize and further improve the function of the control circuit, the control circuit used in the utility model is as follows:

[0026] The control circuit includes a main control circuit, a secondary control circuit, and a drive circuit for powering the motor M of the self-priming pump. The first end of the main control circuit is connected to the positive terminal of the power supply, and the last end is connected to the negative terminal of the power supply. The main control circuit is connected in series with the first normally closed push button switch SB11, the first normally open push button switch SB12, the contactor KM, and the time-delayed disconnecting contact KT1-1 of the first time relay KT1. The normally open main contact of the contactor KM is connected in series in the drive circuit, and the normally open secondary contact of the contactor KM is connected in parallel with the first normally open push button switch SB12.

[0027] The first end of the secondary control circuit is connected between the first normally open push button switch SB12 and the contactor KM, and the last end is connected to the negative terminal of the power supply. The secondary control circuit includes a water replenishment control circuit and a damage prevention control circuit connected in parallel. The electric contact pressure gauge includes a single-pole double-throw contact YX and is electrically connected to the water replenishment control circuit. The single-pole double-throw contact YX includes a moving contact and a first stationary contact ( Figure 2 The "low" position) and the second static contact (corresponding to) Figure 2 (At the "high" position), the moving contact is connected to the beginning of the secondary control circuit, and the end of the secondary control circuit is connected to the first stationary contact through the first water supply branch and to the second stationary contact through the second water supply branch;

[0028] The first water replenishment branch includes a first branch and a second branch connected in parallel. The first branch is connected in series with the normally closed contact of the second intermediate relay KA2 and the second time relay KT2. The second branch is connected in series with the delayed closing contact KT2-1 of the second time relay KT2 and the first intermediate relay KA1. The second intermediate relay KA2 is connected in series in the second water replenishment branch. The normally open contact of the first intermediate relay KA1 and the first time relay KT1 are connected in series in the loss prevention control circuit. The first solenoid valve YV1 and the second solenoid valve YV2 are located in the loss prevention control circuit and are connected in parallel with the first time relay KT1, respectively.

[0029] In this embodiment, the electric contact pressure gauge has two set values, namely a lower limit and an upper limit. When the pressure in the outlet pipe is lower than the lower limit, the moving contact remains connected to the first stationary contact. When the pressure in the outlet pipe is higher than the upper limit, the moving contact remains connected to the second stationary contact. The lower limit can be set to be lower than atmospheric pressure to ensure that the second time relay is energized and starts timing at the same time that the self-priming pump starts and the secondary control circuit is energized. The upper limit should be lower than and close to the pressure value in the outlet pipe when the self-priming pump is working normally.

[0030] The principle of the control circuit is as follows: the first normally closed push button switch SB11 is used as a stop button, the first normally open push button switch SB13 is used as a start button, when the first normally open push button switch SB12 is pressed, the main control circuit is turned on, the contact KM is powered on, the normally open auxiliary contact of the contact KM is closed to complete self-locking, and after the first normally open push button switch SB12 is released, the main control circuit remains on, the normally open main contact of the contact KM is closed, the driving circuit is turned on, and the motor M is powered on to work, so that the self-priming pump is started;

[0031] At the same time, the auxiliary control circuit remains powered on, because the self-priming pump is just started, the pressure in the water outlet pipe is low, the moving contact and the first static contact of the electric contact pressure gauge remain connected, the first branch of the first water supplement branch is turned on, and the second time relay KT2 is powered on to start timing; if the pressure in the water outlet pipe rises to the upper limit value during this period, that is, the self-priming pump is running normally, the single-pole double-throw contact YX of the electric contact pressure gauge is switched to the moving contact and the second static contact to remain connected, the first water supplement branch is cut off, the second time relay KT2 is de-energized to reset, the second water supplement branch is turned on, the second intermediate relay KA2 is powered on, the normally closed contact of the second intermediate relay KA2 is opened, and interlocking is formed;

[0032] If the pressure in the water outlet pipe does not rise to the upper limit value during this period, that is, the self-priming pump does not run normally, after the timing of the second time relay KT2 is completed, the delay closing contact KT2-1 of the second time relay KT2 is closed, the second branch of the first water supplement branch is turned on, and the first intermediate relay KA1 is powered on; the normally open contact of the first intermediate relay KA1 is closed, the damage prevention control circuit is turned on, the first time relay KT1 is powered on to start timing, at the same time, the first electromagnetic valve YV1 and the second electromagnetic valve YV2 are powered on to open, and the automatic water supplement pipe and the automatic drainage pipe start to automatically supplement water to the pump body,

[0033] If the pressure in the water outlet pipe does not rise to the upper limit value after the timing of the first time relay KT1 is completed, the delay opening contact KT1-1 of the first time relay KT1 is opened to cut off the main circuit, the contact KM is de-energized, the normally open main contact of the contact KM is opened, the driving circuit is disconnected, and the motor M of the self-priming pump is de-energized to stop, thereby avoiding burning or damage due to long-term idling or abnormal operation;

[0034] The second time relay KT2 is added, and the circuit is designed to not enable automatic water supplement during the time period when the second time relay KT2 is powered on and timed, because the self-priming pump needs a certain time to start. In this embodiment, the timing length of the second time relay KT2 is set to 60 seconds, and the timing length of the first time relay KT1 is set to 180 seconds. This not only avoids frequent opening and closing of the first electromagnetic valve YV1 and the second electromagnetic valve YV2, but also avoids interference of automatic water supplement with normal start of the self-priming pump, and is conducive to improving the reliability and practicality of the self-priming pump automatic water supplement protection structure.

[0035] In implementation, the time length counted by the second time relay KT2 should be close to the time required for the self-priming pump to start normally

[0036] Please refer to Figure 2 The loss prevention control circuit further has a third branch in parallel with the first time relay KT1, and the third branch has the delay closing contact KT1-2 of the first time relay KT1 and the audible and visual alarm BSG connected in series; in this way, when the first time relay KT1 finishes counting, the delay closing contact KT1-2 of the first time relay KT1 is closed, the third branch is turned on, and the audible and visual alarm BSG is powered to emit an alarm light effect and sound, reminding the staff to pay attention to the situation that the self-priming pump fails to start normally, so as to process it in time and avoid affecting the progress and quality of sewage treatment.

[0037] Please refer to Figure 2 In this embodiment, the main control circuit further has the second normally closed button switch SB21 connected in series between the first normally closed button switch SB11 and the first normally open button switch SB12, and the second normally open button switch SB22 connected in parallel with the first normally open button switch SB12, the first normally closed button switch SB11 and the first normally open button switch SB12 form a group, and the second normally closed button switch SB21 and the second normally open button switch SB22 form a group, one group is arranged in the control room, so as to remotely control the self-priming pump, and the other group is arranged in the control box near the self-priming pump, so as to control the self-priming pump nearby and cooperate with the first manual valve and the second manual valve to maintain the self-priming pump.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the technical solutions, and those of ordinary skill in the art should understand that those who modify or equivalently replace the technical solutions of the present application without departing from the purpose and scope of the present application should be covered in the scope of the claims of the present application.

Claims

1. A self-priming pump automatic water replenishment protection structure, characterized in that: The water outlet pipe is connected with the water outlet of the self-priming pump, a pressure switch is arranged on the water outlet pipe close to the water outlet of the self-priming pump, the pressure switch has a set value and keeps triggering when the pressure in the water outlet pipe is lower than the set value, the pressure switch and the motor of the self-priming pump are electrically connected in the control circuit, and the control circuit makes the first time relay be powered when the pressure switch triggers and makes the motor of the self-priming pump stop after the first time relay finishes timing.

2. The automatic water replenishing protection structure of a self-priming pump according to claim 1, characterized in that: The water injection bolt interface of the self-priming pump is connected with an automatic water supplement pipe, the exhaust port of the self-priming pump is connected with an automatic drainage pipe, and the automatic water supplement pipe and the automatic drainage pipe are respectively provided with electromagnetic valves, which are electrically connected in the control circuit, and the control circuit makes the electromagnetic valves keep open when the pressure switch triggers.

3. The automatic water replenishing protection structure of a self-priming pump according to claim 2, characterized in that: The pressure switch adopts an electric contact pressure gauge, the water injection bolt interface of the self-priming pump is connected with a manual water supplement pipe, the exhaust port of the self-priming pump is connected with a manual drainage pipe, and the manual water supplement pipe and the manual drainage pipe are respectively provided with manual valves.

4. The automatic water replenishing protection structure of a self-priming pump according to claim 2, characterized in that: The control circuit comprises a main control circuit, a sub-control circuit and a driving circuit for supplying power to the motor of the self-priming pump, the first end of the main control circuit is connected with the positive pole of the power supply, the last end is connected with the negative pole of the power supply, the normally closed button switch, the normally open button switch, the contactor and the delay opening contact of the first time relay are connected in sequence on the main control circuit, the normally open main contact of the contactor is connected in series in the driving circuit, and the normally open auxiliary contact of the contactor is connected in parallel with the normally open button switch; The first end of the sub-control circuit is connected between the normally open button switch and the contactor, and the last end is connected with the negative pole of the power supply, the sub-control circuit comprises a water supplement control circuit and a loss prevention control circuit connected in parallel, the pressure switch comprises a single-pole double-throw contact and is electrically connected in the water supplement control circuit, the single-pole double-throw contact comprises a moving contact, a first static contact and a second static contact, the moving contact keeps connected with the first static contact when the pressure in the water outlet pipe is lower than the set value, the moving contact is connected with the first end of the sub-control circuit, the last end of the sub-control circuit is connected with the first static contact through a first water supplement branch and connected with the second static contact through a second water supplement branch; the first water supplement branch comprises a first branch and a second branch connected in parallel, the normally closed contact of the second intermediate relay and the second time relay are connected in series on the first branch, the delay closing contact of the second time relay and the first intermediate relay are connected in series on the second branch, and the second intermediate relay is connected in series on the second water supplement branch; the normally open contact of the first intermediate relay and the first time relay are connected in sequence on the loss prevention control circuit, and the first electromagnetic valve and the second electromagnetic valve are located on the loss prevention control circuit and connected in parallel with the first time relay.

5. The automatic water replenishment protection structure of a self-priming pump according to claim 4, characterized in that: The loss prevention control circuit further has a third branch connected in parallel with the first time relay, the delay closing contact of the first time relay and the audible and visual alarm are connected in series on the third branch.

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