Automatic stop control device of water pump
By introducing automatic shutdown control devices with time relays and pressure switches into high-pressure washer, the problem of long-term idle rotation of the high-pressure washer is solved, and the automatic shutdown of the equipment is achieved, reducing wear and failure rates and saving electricity.
Patent Information
- Application Number
- CN202422642600.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-10-30
AI Technical Summary
The high-pressure washing machine idles for a long time when it is not cleaned, resulting in wear of equipment components, increased failure rate and power loss.
The automatic shutdown control device consisting of a time relay, a three-phase AC contactor and a pressure switch is used to detect the water flow pressure value through the pressure switch to control the timing circuit to realize automatic shutdown of the water pump.
Reduce wear of equipment components, reduce failure rate, save electricity, and improve the stability and service life of equipment.
Smart Images
Figure CN223190601U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of deck high-pressure cleaning, and particularly relates to an automatic shutdown control device. Background Art
[0002] When cleaning the deck in an outdoor area, fresh water enters the high-pressure pump of the high-pressure washer. Driven by the motor, the high-pressure pump compresses the fresh water under normal pressure, and the generated high-pressure fresh water is frequently used for cleaning the platform deck and cleaning a small amount of mud in the drilling area. When the deck is not being cleaned, the high-pressure washer runs idly for a long time without automatic shutdown, which will cause wear of equipment components, an increase in failure rate, and even power consumption. Content of the Utility Model
[0003] The technical problem to be solved by the utility model is to provide an automatic shutdown control device for a water pump.
[0004] The technical solution adopted by the utility model to solve its technical problem is: an automatic shutdown control device for a water pump, which includes a time relay, a three-phase AC contactor, and a pressure switch;
[0005] The time relay includes a time relay coil and a delay-off auxiliary contact;
[0006] The three-phase AC contactor includes three main contacts and a three-phase AC contact coil;
[0007] The pressure switch is connected in series with the time relay coil to form a timing circuit;
[0008] The three-phase AC contact coil and the delay-off auxiliary contact are connected in series to form a control circuit;
[0009] The three-phase power supply is connected to the motor of the water pump through the three main contacts to supply power to the motor;
[0010] The pressure switch disconnects or connects the timing circuit according to the water flow pressure value at the outlet of the water pump;
[0011] When the timing circuit is conducting, the time relay coil is powered on for timing. When the timing reaches the preset duration, the delay auxiliary contact is disconnected, thereby disconnecting the control circuit; the three-phase AC contact coil is powered off, controlling the three main contacts to disconnect the motor from the three-phase power supply, and the water pump stops.
[0012] Preferably, the timing circuit further includes a timing power switch;
[0013] The timing power switch is connected in series with the time relay coil;
[0014] When the timing power switch is turned off, the coil of the time relay is de-energized.
[0015] Preferably, the three-phase AC contactor further includes a normally open auxiliary contact;
[0016] The normally open auxiliary contact is connected in series in the timing circuit;
[0017] When the coil of the three-phase AC contactor is de-energized, the normally open auxiliary contact is opened, and the coil of the time relay is de-energized.
[0018] Preferably, an overload protection module is further included;
[0019] The overload protection module includes a thermal relay; the thermal relay includes a thermal element and an auxiliary contact of the thermal relay;
[0020] The auxiliary contact of the thermal relay is connected in series in the control circuit;
[0021] If the motor is overloaded, the current passing through the thermal element increases, and the auxiliary contact of the thermal relay is opened, thereby cutting off the power supply of the motor.
[0022] Preferably, the timing circuit is connected in parallel with the control circuit; or,
[0023] The motor, the timing circuit and the control circuit are connected in parallel.
[0024] Preferably, when the motor, the timing circuit and the control circuit are connected in parallel, the automatic shutdown control device further includes a three-phase circuit breaker; the three-phase power supply is connected to the motor, the control circuit and the timing circuit through the three-phase circuit breaker to supply power to the motor, the control circuit and the timing circuit.
[0025] Preferably, a fuse tube module is further included; the fuse tube module is respectively connected to the power input ends of the timing circuit and the control circuit.
[0026] Preferably, a start-stop module is further included; the start-stop module includes a stop button and a start button;
[0027] The start button and the stop button are connected in series; the start button and the stop button are connected in series in the control circuit.
[0028] Preferably, the three-phase AC contactor further includes three-phase auxiliary contacts; the three-phase auxiliary contacts are connected in parallel with the start button and in series with the stop button.
[0029] Preferably, the control circuit further includes a bypass switch; the bypass switch is connected in parallel with the auxiliary contact of the time relay.
[0030] The implementation of the present utility model has the following beneficial effects:
[0031] Through the cooperation between the pressure switch and the time relay, the present utility model can achieve the function of disconnecting the circuit by using the time relay within a certain period after the pressure switch is closed. After the pump is started by the present utility model, if the cleaning operation is not actually carried out for a long time, the pump will automatically stop, thereby reducing the wear of equipment components, reducing the failure rate of the equipment, and saving electric energy. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] The present utility model will be further described below in conjunction with the drawings and embodiments:
[0033] Figure 1 It is the electrical schematic diagram of the automatic shutdown control device;
[0034] Figure 2 is Figure 1 The electrical schematic diagram of the automatic shutdown control device shown in some other scenarios. SPECIFIC EMBODIMENTS
[0035] In order to have a clearer understanding of the technical features, objectives, and effects of the present utility model, the specific embodiments of the present utility model will now be described in detail in contrast to the drawings.
[0036] Terms such as "first", "second", etc. are only used for the purpose of convenient description, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of technical features. The meaning of "multiple" is two or more, unless otherwise specifically and clearly defined.
[0037] The above terms are only for the purpose of convenient description and cannot be understood as a limitation to the present technical solution.
[0038] An automatic shutdown control device for a water pump provided by an embodiment of the present utility model.
[0039] In an executable embodiment, as Figure 1 shown, where KM1 is a three-phase AC contactor; SJ is a time relay; P is a pressure switch; 101 is three main contacts; 102 is a three-phase AC contact coil; 201 is a time relay coil; 202 is a delay-off auxiliary contact.
[0040] The automatic shutdown control device includes a time relay SJ, a three-phase AC contact KM1, and a pressure switch P.
[0041] The time relay SJ includes a time relay coil 201 and a delay-off auxiliary contact 202.
[0042] Specifically, the time relay SJ is a commonly used relay in electrical control systems. It is mainly used to implement time control functions in circuits. The time relay SJ can close or open the circuit according to the set time delay, thereby controlling the start and stop of the water pump. After the time relay coil 201 is powered on, the delayed break auxiliary contact 202 will close or open according to the set time delay. By means of the delayed break auxiliary contact 202, the operation of the water pump can be stopped after a period of time, thus reducing the waste of electric power resources.
[0043] The three-phase AC contactor KM1 includes three main contacts 101 and a three-phase AC contact coil 102.
[0044] Specifically, the three-phase AC contactor KM1 controls the start, stop and reverse of the motor by attracting and releasing the main contacts through the three-phase AC contact coil 102.
[0045] The pressure switch P is connected in series with the time relay coil 201 to form a timing circuit.
[0046] The three-phase AC contact coil 102 and the delayed break auxiliary contact 202 are connected in series to form a control circuit.
[0047] Furthermore, the three main contacts 101 of the three-phase AC contactor KM1 are respectively connected to the three phase lines of the three-phase power supply.
[0048] The three-phase power supply is connected to the motor of the water pump through the three main contacts 101 to supply power to the motor.
[0049] The pressure switch P disconnects or connects the timing circuit according to the water flow pressure value at the outlet of the water pump.
[0050] Specifically, the pressure switch P detects the water flow pressure at the outlet of the water pump through an internal sensing element. When the pressure reaches or exceeds the preset threshold, the sensing element will drive the contact to close, allowing current to flow through and activating the time relay coil to start timing; on the contrary, when the pressure drops below the preset value, the contact will open, interrupting the current supply to the time relay coil 202 and stopping the timing, thereby automatically disconnecting or connecting the timing circuit according to the real-time change of the water flow pressure.
[0051] The sensing element included in the pressure switch P can be a diaphragm, a bellows or a piston, etc. When the water flow pressure at the outlet of the water pump changes, this sensing element will sense the change in pressure.
[0052] When the timing circuit is conducting, the time relay coil 201 is powered on for timing. When the preset time duration is reached, the delayed auxiliary contact 202 is disconnected, thereby disconnecting the control circuit. The three-phase AC contact coil 102 is de-energized, controlling the three main contacts 101 to disconnect the motor from the three-phase power supply, and the water pump stops operating.
[0053] This utility model realizes that after the water pump starts, if water pumping is not carried out for a long time, causing water flow with insufficient pressure to pass through the pressure switch, the water pump will automatically shut down through the cooperation of a pressure sensor and a time relay.
[0054] Further, in one embodiment, the time relay SJ is a power-off delay type relay, which starts timing after power-off and delays to disconnect the auxiliary contact 202 after reaching the set time.
[0055] In some executable embodiments, the sensing element of the pressure switch can also be a weight, and the weight of the fixed weight is used to control the pressure required for the pressure switch to open and close. As a pressure sensing element, the weight is usually used in combination with a lever system. This mechanical design is simple and reliable and is not easily affected by electromagnetic interference. Moreover, the weight can accurately control the trigger pressure of the pressure switch by adding, reducing or adjusting the position, which makes the setting of the pressure switch very flexible and accurate.
[0056] At the same time, since the weight type pressure switch has fewer mechanical components, it is relatively simple to maintain, and only the position of the weight and the flexibility of the lever need to be checked regularly.
[0057] In addition, since the weight type pressure switch depends on mechanical components, they are usually more durable than electronic sensors and can work for a long time in a harsh environment. For example, in working scenarios such as offshore oilfields, traditional electromagnetic devices are prone to corrosion and failure. While the weight type pressure switch has better corrosion resistance, which further improves the stability of equipment operation, reduces the failure rate and prolongs the service life of the equipment.
[0058] In an executable embodiment, the timing circuit further includes a timing power switch. The timing power switch is connected in series with the time relay coil. When the timing power switch is disconnected, the time relay coil is powered off.
[0059] The timing power switch provides a manual control point, allowing the operator to turn on or off the timing function at any time according to needs, increasing the flexibility of the system. At the same time, when the timing function is not required, the power supply of the time relay coil can be cut off by disconnecting the timing power switch, reducing unnecessary energy consumption.
[0060] In some scenarios of this embodiment, if the timing circuit fails, disconnecting the timing power switch can quickly isolate the problem, facilitating diagnosis and repair.
[0061] During maintenance or overhaul, disconnecting the timing power switch can ensure that the time relay will not start accidentally, thus avoiding possible safety risks.
[0062] In an executable embodiment, the three-phase AC contactor further includes a normally open auxiliary contact.
[0063] The normally open auxiliary contact is connected in series in the timing circuit.
[0064] When the three-phase AC contactor coil is powered off, the normally open auxiliary contact is disconnected, and the time relay coil is powered off.
[0065] Connecting the normally open auxiliary contact in the three-phase AC contactor in series in the timing circuit can ensure that the three-phase AC contactor and the time relay are in synchronous operation. When the three-phase AC contactor is powered off, the normally open auxiliary contact is disconnected, and the time relay also stops timing, which can avoid the situation that the time relay is still timing after the three-phase AC contactor has already disconnected the circuit. This ensures the safety of users during operation.
[0066] In an executable embodiment, the automatic shutdown control device further includes an overload protection module.
[0067] The overload protection module includes a thermal relay. The thermal relay includes a heating element and a thermal relay auxiliary contact.
[0068] The heating element is connected in series with the motor; the thermal relay auxiliary contact is connected in series in the control circuit.
[0069] If the motor is overloaded, the current through the heating element increases, and the thermal relay auxiliary contact is disconnected, thereby cutting off the power supply of the motor.
[0070] The thermal relay is specifically designed to protect the motor from overload, rather than for short-circuit protection. It can protect according to the thermal characteristics of the motor, match the overload characteristics of the motor, and provide more precise protection. The thermal relay has an inverse time characteristic, that is, the greater the overload current, the shorter the operating time. This characteristic enables the thermal relay to respond quickly when the water pump is overloaded, thereby reducing the damage to the water pump.
[0071] In an executable embodiment, the timing circuit is connected in parallel with the control circuit.
[0072] Specifically, the timing circuit and the control circuit use different power supplies from the motor. The timing circuit can provide precise time control to ensure that the control circuit is disconnected after a specific duration, thereby achieving precise control of the equipment. The parallel design enables the timing circuit to work independently without the control circuit operating, achieving automatic control of the water pump shutdown and reducing manual intervention.
[0073] Furthermore, through the parallel design, additional hardware requirements can be reduced, thereby saving costs.
[0074] In an executable embodiment, the motor, the timing circuit, and the control circuit are connected in parallel.
[0075] Specifically, the motor, the timing circuit, and the control circuit are in a parallel relationship with each other. The motor, the timing circuit, and the control circuit share the three-phase power supply. Connecting the motor, the timing circuit, and the control circuit in parallel can provide a flexible and reliable control mechanism, enabling the timing circuit to independently operate the motor when the control circuit is not working, achieving precise time control and overload protection, while increasing the redundancy and fault isolation capabilities of the system, simplifying the diagnosis and maintenance process, and improving the overall operating efficiency and safety.
[0076] In an executable embodiment, when the motor, the timing circuit, and the control circuit are connected in parallel, the automatic shutdown control device further includes a three-phase circuit breaker. The three-phase power supply is connected to the motor, the control circuit, and the timing circuit through the three-phase circuit breaker to supply power to the motor, the control circuit, and the timing circuit.
[0077] The main function of the three-phase circuit breaker is to provide overload, short-circuit, and isolation protection in the three-phase power system. It can automatically cut off the circuit with abnormal current to protect electrical equipment from damage, and at the same time facilitate safe maintenance and repair. Using the three-phase circuit breaker enables the water pump to operate frequently without damage. At the same time, the three-phase circuit breaker also has selective protection to achieve rapid fault location and isolation, integrates multiple protection functions to provide comprehensive circuit protection. And the three-phase circuit breaker also supports remote control and automated operation, improving the reliability and safety of the system.
[0078] In an executable embodiment, the automatic shutdown control device further includes a fuse module. The fuse module is respectively connected to the power input terminals of the timing circuit and the control circuit.
[0079] Specifically, the fuse module can provide an additional protection layer for the timing circuit and the control circuit. When a fault occurs in a certain part of the timing circuit, the control circuit, or the motor, the corresponding fuse blows, isolating the faulty part and preventing the fault from spreading to other circuits.
[0080] In some executable embodiments, the fuse module includes two groups of fuses. The first group of fuses is connected in series with the timing circuit and in parallel with the control circuit. The second group of fuses is connected in series with the control circuit and in parallel with the timing circuit.
[0081] In some executable embodiments, the fuse module is connected in series with both the timing circuit and the control circuit at the same time.
[0082] See Figure 2 , in an executable embodiment, it further includes a start-stop module SB. The start-stop module includes a stop button SB0 and a start button SB1.
[0083] The start button SB1 and the stop button SB0 are connected in series in the control circuit.
[0084] Specifically, when the stop button SB0 is pressed, the motor does not stop running, only the water outlet of the water pump stops discharging water. At this time, the time relay starts timing. When the time relay reaches the preset time, the delayed break auxiliary contact disconnects, the three-phase AC contactor coil loses power, the three main contacts disconnect, and the motor stops running.
[0085] The series design can prevent the start and stop buttons from being pressed simultaneously, thus avoiding possible misoperations and damage to the motor and control system.
[0086] See Figure 2 , in an executable embodiment, the three-phase AC contactor KM1 further includes three-phase auxiliary contacts 104. The three-phase auxiliary contacts 104 are connected in parallel with the start button SB1 and in series with the stop button SB0.
[0087] Specifically, this embodiment allows the start button to provide an additional closed path in the control circuit, while the stop button directly cuts off the circuit, ensuring that the device can be stopped quickly and safely in case of an emergency.
[0088] See Figure 2 , in an executable embodiment, the control circuit further includes a bypass switch K2; the bypass switch K2 is connected in parallel with the time relay auxiliary contact 202.
[0089] The bypass switch provides an option for manual intervention, allowing the operator to bypass the control of the time relay and directly control the start and stop of the motor when needed. If the time relay auxiliary contact fails, the bypass switch can serve as an alternative path to ensure the normal operation of the motor.
[0090] In an executable embodiment, as Figure 2 shown, where KM1 is a three-phase AC contactor; SJ is a time relay; P is a pressure switch; FU is a fuse module; SB is a start-stop module; FR is a thermal relay; K2 is a bypass switch; QF is a three-phase circuit breaker; K1 is a timing power switch.
[0091] 101 are three main contacts; 102 is a three-phase AC contactor coil; 103 is a normally open auxiliary contact; 104 are three-phase auxiliary contacts. 201 is a time relay coil; 202 is a delayed break auxiliary contact. FU1 is the first fuse; FU2 is the second fuse. SB0 is the stop button; SB2 is the start button. FR0 is a thermal element; FR1 is a thermal relay auxiliary contact.
[0092] Current flows into the three-phase circuit breaker QF and is divided into two paths; one path passes through the three main contacts 101 and the thermal element FR0 to the motor. The other path passes through the fuse tube module FU and is further divided into two paths that flow into the control circuit and the timing circuit respectively. The first fuse FU1 and the second fuse FU2 are respectively connected in series with the input and output ends of the control circuit and the timing circuit. The control circuit includes a start-stop module SB, three-phase auxiliary contacts 104, a three-phase AC contact coil 102, a thermal relay auxiliary contact FR1, and a delay-off auxiliary contact 202. The timing circuit includes a timing power switch K1, a bypass switch K2, a normally open auxiliary contact 103, a pressure switch P, and a time relay coil 201.
[0093] In this embodiment, a pressure switch can be installed at the outlet of the high-pressure cleaner. The on-off quantity of the pressure change is used to control the time relay. It has been observed that when the high-pressure cleaner is in use, the outlet pressure is between 2200 PSI - 3000 PSI, the outlet pressure is 0 during idling, and occasionally there is a small amount of leakage in the unit, the pressure is replenished, and the unit makes a momentary jog, and the pressure is between 800 PSI - 1000 PSI. The on-off quantity of the pressure sensor is used to control the time relay.
[0094] The timing power switch K14 is the power switch of the timing circuit. If a fault occurs in the timing circuit, this power switch can be disconnected.
[0095] The bypass switch K2 is the bypass switch for the auxiliary contact of the time relay. If the auxiliary contact of the time relay fails, this switch can be directly bypassed. Adding this bypass switch is to ensure the reliability of the original circuit.
[0096] The utility model adds a pressure switch and a time relay accessory to the original control circuit, which essentially ensures the good applicability of the high-pressure cleaner. After activation, the high-pressure cleaner will automatically stop after idling for a certain period of time, solving the problems of equipment component wear and increased failure rate caused by the long-term idling of the cleaner when the deck personnel do not clean the deck after use.
[0097] The above embodiments only represent the preferred implementation modes of the utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent; it should be noted that for those of ordinary skill in the art, without departing from the concept of the utility model, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the utility model; therefore, all equivalent transformations and modifications made to the scope of the utility model's claims shall fall within the scope covered by the utility model's claims.
Claims
1. An automatic shutdown control device for a water pump, characterized in that: Including time relay, three-phase AC contactor and pressure switch; The time relay comprises a time relay coil and a delayed disconnection auxiliary contact; The three-phase AC contactor includes three main contacts and a three-phase AC contact coil; The pressure switch is connected in series with the time relay coil to form a timing circuit; The three-phase AC contact coil and the delayed-off auxiliary contact are connected in series to form a control circuit; The three-phase power supply is connected to the motor of the water pump through the three main contacts to supply power to the motor; The pressure switch disconnects or connects the timing circuit according to the water flow pressure value at the water pump outlet; When the timing circuit is turned on, the time relay coil is energized to start timing. When the timing reaches a preset time, the delayed disconnection auxiliary contact is disconnected, thereby disconnecting the control circuit; the three-phase AC contact coil is de-energized, controlling the three main contacts to disconnect the motor from the three-phase power supply, and the water pump stops.
2. The automatic shutdown control device according to claim 1, characterized in that: The timing circuit also includes a timing power switch; The timing power switch is connected in series with the time relay coil; When the timing power switch is turned off, the time relay coil is de-energized.
3. The automatic shutdown control device according to claim 1, characterized in that: The three-phase AC contactor also includes a normally open auxiliary contact; The normally open auxiliary contact is connected in series in the timing circuit; When the three-phase AC contact coil is de-energized, the normally open auxiliary contact is disconnected and the time relay coil is de-energized.
4. The automatic shutdown control device according to claim 1, characterized in that: Also includes overload protection module; The overload protection module includes a thermal relay; the thermal relay includes a thermal element and a thermal relay auxiliary contact; The thermal element is connected in series with the motor; the auxiliary contact of the thermal relay is connected in series with the control circuit; If the motor is overloaded, the current flowing through the thermal element increases, and the auxiliary contacts of the thermal relay are disconnected, thereby cutting off the power supply to the motor.
5. The automatic shutdown control device according to claim 1, characterized in that: The timing circuit is connected in parallel with the control circuit; or, The motor, the timing circuit and the control circuit are connected in parallel.
6. The automatic shutdown control device according to claim 5, characterized in that: When the motor, the timing circuit and the control circuit are connected in parallel, the automatic shutdown control device also includes a three-phase circuit breaker; the three-phase power supply is connected to the motor, the control circuit and the timing circuit through the three-phase circuit breaker to supply power to the motor, the control circuit and the timing circuit.
7. The automatic shutdown control device according to any one of claims 1 to 6, characterized in that: It also includes a fuse module; the fuse module is connected to the power input end of the timing circuit and the control circuit respectively.
8. The automatic shutdown control device according to claim 1, characterized in that: Also includes a start-stop module; the start-stop module includes a stop button and a start button; The start button and the stop button are connected in series in the control loop.
9. The automatic shutdown control device according to claim 8, characterized in that: The three-phase AC contactor further includes a three-phase auxiliary contact; the three-phase auxiliary contact is connected in parallel with the start button and in series with the stop button.
10. The automatic shutdown control device according to claim 1, characterized in that: The control loop further includes a bypass switch; the bypass switch is connected in parallel with the auxiliary contact of the time relay.