Multi-user control box common water pump control system

Abstract

The invention discloses a multi-user control box common water pump control circuit and system, normally open contacts of contactors of all user water pump control boxes of the system are connected to a main water pump starting control loop in parallel, and the number of the user control boxes can be flexibly expanded by increasing the number of parallel loops; the control circuit realizes independent control of the same main water pump by a plurality of user water pump control boxes through independent control design; the control circuit and the system are suitable for a plurality of users in the same transformer substation to control the water demands of the jurisdiction areas of the users respectively, economic disputes and management contradictions caused by water supply management among different users are effectively avoided, and the practicability and the reliability of the system are improved.

Description

Technical Field

[0001] The present invention relates to a multi-user control box shared water pump control system, belonging to the field of substation water pump control. Background Art

[0002] With the reform of the global power grid operation mechanism, the privatization operation of foreign power grids has gradually become the mainstream, and the operation and maintenance management mode of substations has also changed significantly. In this mode, a substation is usually operated and managed by multiple operation and maintenance users, and the situation where multiple users need to jointly control a water pump is becoming increasingly common. However, most of the water pump control systems in domestic substations adopt a single-user control method, which cannot meet the needs of multi-user simultaneous control. Although some existing intelligent control systems can achieve multi-user control, they usually rely on complex communication modules and software systems, resulting in high costs.

[0003] The existing patent CN204716519U proposes a new type of multi-user shared water pump control box. By setting multiple control lines, each user can control the water pump through one control loop. Although this solution solves the basic need for multiple users to jointly control a water pump, this patent shares a single water pump control box among different users, and fails to meet the requirement of independent control of the water pump by different users in different control rooms within the same substation.

[0004] The substation has low requirements for the complexity of the water pump control system, and pays more attention to the reliability and economy of the water pump system. Therefore, there is an urgent need for a new multi-user control box to control a single water pump system to effectively solve the above problems, and be able to achieve multi-user joint control of the water pump through a simple control circuit without relying on complex communication modules and software, ensuring the low cost, high reliability and ease of use of the system. Summary of the Invention

[0005] The present invention aims to provide a multi-user control box shared water pump control system, which enables the multi-user control box to jointly control a single water pump, ensuring the economy, reliability and ease of use of the system.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a multi-user control box shared water pump control system, including: a shared main water pump system, and n user control systems;

[0007] The shared main water pump system includes: a main water pump and a main water pump starting box; the main water pump starting box includes: a soft starter and a main water pump starting control circuit; the i-th user control system includes: an i-th user control box, an i-th user water tank, a solenoid valve DCFi, and an i-th user control box control circuit; the i-th user control box includes: a contactor KAi, a selector switch Si, a start button BLi, and a stop button BDi; the i-th user water tank includes: a sensor FQi for detecting the liquid level of the i-th user water tank; the solenoid valve DCFi is used to control the water inlet of the i-th user water tank; the selector switch Si includes an automatic gear and a manual gear; the main water pump starting control circuit includes: one end of the soft starter is connected to the power supply circuit, and the other end is connected to the main water pump motor for controlling the start and stop of the main water pump motor; the normally open contacts of the contactors KA1, KA2,..., KAn of all user control boxes are connected in parallel and are all connected between the power supply circuit and the soft starter; the i-th user control box control circuit includes: the normally open contact of the sensor FQi is connected in series between the coil of the contactor KAi and the automatic gear of the selector switch Si; the start button BLi is connected in series between the coil of the contactor KAi and the manual gear of the selector switch Si, the start button BLi is connected in parallel with the normally open contact of the contactor KAi, and they are all connected between the coil of the contactor KAi and the manual gear of the selector switch Si, and the normally closed contact of the stop button BDi is connected in series between the manual gear of the selector switch Si and the start button BLi; the normally closed coil of the solenoid valve DCFi is connected in series with the normally open contact of the contactor KAi; where 1 ≤ i ≤ n and n ≥ 2.

[0008] The above solution realizes the independent control of the same main water pump by setting multiple user water pump control boxes. The normally open contacts of the contactors of each water pump control box are connected in parallel to the main water pump starting control circuit. By increasing the number of parallel circuits, the number of user control boxes can be flexibly expanded to meet different user needs. The above solution is applicable to multiple users in the same substation to separately control the water use requirements of their respective jurisdictions. Through independent control design, it effectively avoids economic disputes and management contradictions caused by water supply management between different users, and improves the practicability and reliability of the system.

[0009] According to the embodiments of the present invention, the present invention can be further optimized. The following is the technical solution formed after optimization:

[0010] In one preferred embodiment, the i-th user control box further includes: an i-th main water pump start signal lamp and an i-th main water pump stop signal lamp; the i-th user control box control circuit further includes: the normally open contact of the contactor KAi is connected in series with the i-th main water pump start signal lamp, and the normally closed contact of the contactor KAi is connected in series with the i-th main water pump stop signal lamp; the i-th main water pump start signal lamp indicates that the i-th user controls the main water pump to be in the start state, and the i-th main water pump stop signal lamp indicates that the i-th user controls the main water pump to be in the stop state. Users can monitor the start and stop states of the main water pump through the signal lamps.

[0011] In one preferred embodiment, the i-th user control system further includes: m water distribution pump systems; the k-th water distribution pump system includes: the k-th water distribution pump and the k-th water distribution tank; the i-th user control box further includes: the relay K corresponding to the k-th water distribution pump i k , selector switch S i k , Start button BL i k , Stop button BD i k ; The kth water distribution tank includes: sensor FQ i k , used to detect the liquid level of the k-th water distribution tank; the i-th user water tank also includes: the sensor FQ corresponding to the k-th water distribution tank i q , used to detect the liquid level of the i-th user water tank; the i-th user control box control circuit also includes: m water distribution pump control circuits; the k-th water distribution pump control circuit includes: relay K i k The coil and selector switch S i k Connect sensor FQ in series between automatic gears i q Normally closed contact and sensor FQ i k Normally open contact of relay K i k The coil and selector switch S i k Connect the start button BL between the manual gear i k , start button BL i k With relay K i k The normally open contacts of the relay are connected in parallel and connected to the relay K i k The coil and selector switch S i k Select the manual mode by switching to S i k Manual transmission and start button BL i k Connect the stop button BD in series i k Normally closed contact; where 1≤k≤m, 1≤q≤m, m≥1.

[0012] The above solution flexibly expands the control quantity of each user's sub-pump by increasing the number of relays in a single user control box, meeting the water use requirements of different production and office locations for each user. While ensuring the operation of the main pump, the independence of the operation and maintenance management of each user is maintained.

[0013] In one preferred embodiment, the i-th user control box further includes: the k-th sub-pump start signal lamp and the k-th sub-pump stop signal lamp; the k-th sub-pump control circuit further includes: relay K i k The normally open contact of is connected in series with the k-th sub-pump start signal lamp, and the relay K i k The normally closed contact of is connected in series with the k-th sub-pump stop signal lamp; the k-th sub-pump start signal lamp indicates that the k-th sub-pump is in the start state, and the k-th sub-pump stop signal lamp indicates that the k-th sub-pump is in the stop state. The user can monitor the start and stop states of the sub-pump through the signal lamp.

[0014] In one preferred embodiment, the main pump starting box further includes: a circuit breaker; the main pump starting control circuit further includes: one end of the circuit breaker is connected to the power supply circuit, and the other end is connected to the parallel circuit of the normally open contacts of the contactors KA1, KA2,..., KAn of all user control boxes; and / or the i-th user control box further includes: the i-th circuit breaker; the i-th user control box control circuit further includes: one end of the i-th circuit breaker is connected to the power supply circuit, and the other end is connected to the selector switch Si; and / or the i-th user control box further includes: the k-th circuit breaker; the k-th sub-pump control circuit further includes: one end of the k-th circuit breaker is connected to the power supply circuit, and the other end is connected to the selector switch S i k .

[0015] Through the above solution, when a short circuit or overload fault occurs in the control circuit, the circuit breaker can cut off the circuit within milliseconds, avoiding the thyristor of the soft starter from being burned by the surge current and protecting the contactor coil or contacts from being burned.

[0016] In one preferred embodiment, the main pump starting box further includes: a fuse; the main pump starting control circuit further includes: the fuse is connected in series to the power supply circuit; and / or the i-th user control box further includes: the i-th fuse; the i-th user control box control circuit further includes: the i-th fuse is connected in series to the power supply circuit; and / or the i-th user control box further includes: the k-th fuse; the k-th sub-pump control circuit further includes: the k-th fuse is connected in series to the power supply circuit. In the above solution, when a short circuit occurs in the circuit, the fuse melts and the power supply is disconnected. The fuse is used as a backup to cope with extreme short-circuit currents for short-circuit protection.

[0017] In one preferred embodiment, the main water pump starting box further includes: a water pump speed governor; the water pump speed governor is connected in parallel with the main water pump starting control circuit. In the above solution, the water pump speed governor is used to adjust the rotational speed of the main water pump motor.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: A multi-user control box shared water pump control system provided by the present invention realizes independent control of the same main water pump by multiple user water pump control boxes through independent control design. The normally open contacts of the contactors of each user water pump control box are connected in parallel to the main water pump starting control circuit. By increasing the number of parallel circuits, the number of user control boxes can be flexibly expanded to meet different user requirements. This system is applicable to multiple users within the same substation to separately control the water use requirements in their respective jurisdictions, effectively avoiding economic disputes and management contradictions caused by water supply management between different users, and improving the practicability and reliability of the system. Description of the Drawings

[0019] Figure 1 is a schematic diagram of a multi-user control box shared water pump control system according to an embodiment of the present invention;

[0020] Figure 2 is a control circuit diagram of the main water pump starting box according to an embodiment of the present invention;

[0021] Figure 3 is a control circuit diagram of the control box 1 of user 1 according to an embodiment of the present invention;

[0022] Figure 4 is a control circuit diagram of the control box 2 of user 2 according to an embodiment of the present invention;

[0023] Figure 5 is a control circuit diagram of the sub-water pump 21 of user 2 according to an embodiment of the present invention;

[0024] Figure 6 is a control circuit diagram of the sub-water pump 22 of user 2 according to an embodiment of the present invention. Detailed Embodiments

[0025] The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0026] Embodiment 1

[0027] Embodiment 1 provides a multi-user control box common water pump control system, including: a main water pump starting box, user water pump control boxes 1 / 2 / … / n, float level sensors FQ1 / FQ2 / … / FQn, solenoid valves DCF1 / DCF2 / … / DCFn and corresponding control circuits. Each user water pump control box 1 / 2 / … / n is located in a different control room and independently controls the starting control circuit of the same main water pump. By starting contactors in different user water pump control boxes through float level sensors in different user water tanks, the main water pump starting box receives the starting signals of contactors in different user control boxes, thereby realizing the independent start and stop of the main water pump by different users. Each user solenoid valve receives the starting signal of the contactor in the different user control box, and the valves of each user solenoid valve are opened, thereby realizing the independent control of the solenoid valves of their respective user water pipes. Among them, the float level sensor can be replaced by a photoelectric level sensor, a pressure level sensor, a ultrasonic level sensor, etc., which can detect the level height through different principles.

[0028] The main water pump starting box includes: a soft starter, a water pump gear speed regulator, a circuit breaker, a fuse and its control circuit. A soft starter is arranged in the main water pump starting box, which is used to control the smooth start of the water pump motor by controlling the rising rate of voltage or current, and integrates protection functions such as overload, short circuit, and phase loss protection to realize the protection of the motor and water pump system [Reference: Wang Mingjun. Improvement of the control circuit of the inlet water pump soft starter [J]. Equipment Management and Maintenance, 2005, 21: 47-48.]. The normally open contacts of contactors KA1 / KA2 / … / KAn in different user control boxes are connected in parallel to the main control circuit of the soft starter. The fuse is connected in series in the total power supply circuit, and the circuit breaker is connected in series in the main control circuit of the soft starter, and the start and stop control of the water pump motor is realized through the soft starter. When a short circuit or overload fault occurs in the soft starter or the motor, the circuit breaker can cut off the circuit within milliseconds to prevent the thyristor of the soft starter from being burned by the surge current. The fuse in the power supply circuit is used for short circuit protection. When a short circuit occurs in the circuit, the fuse melts and the power supply is disconnected. The fuse is used as a backup to cope with extreme short circuit currents.

[0029] The user water pump control box includes: a control box body, a contactor, a relay, a circuit breaker, a fuse, a three-position selector switch, a red signal lamp, a green signal lamp, a control button and its control circuit. The fuse is connected in series in the total power supply circuit, and the circuit breaker is connected in series in the contactor control circuit. When a short circuit or overload fault occurs in the contactor control circuit, the circuit breaker can cut off the circuit within milliseconds to protect the contactor coil or contacts from being burned. The fuse in the power supply circuit is used for short circuit protection. When a short circuit occurs in the circuit, the fuse melts and the power supply is disconnected. The fuse is used as a backup to cope with extreme short circuit currents.

[0030] The control loop of the user water pump control box includes: a main control loop, a solenoid valve control loop, and a signal loop. The main control loop is connected in series with a three-position selector switch, a normally open contact of a low liquid level float sensor, a contactor coil, a normally open contact of the contactor, a start button, and a stop button. The solenoid valve control loop is connected in series with a normally open contact of the contactor and a normally closed coil of the solenoid valve. The signal loop is connected in series with a normally open contact of the contactor and a red main signal lamp, and the red main signal lamp is used to indicate that the main water pump is in the starting state; the signal loop is connected in series with a normally open contact and a normally closed contact of the contactor and a green main signal lamp, and the green main signal lamp is used to indicate that the main water pump is in the stopped state.

[0031] Embodiment 2

[0032] In this Embodiment 2, each user water tank can also be connected in series with the signal of the float level sensor of each user sub-water tank through an additional float level sensor, so as to start the start relay of each user's sub-water pump, thereby realizing the control of the water pumps in different location areas by each user.

[0033] In this Embodiment 2, the control loop of the sub-water pump of the user water pump control box includes: a main control loop and a signal loop. The main control loop is connected in series with a three-position selector switch for the sub-water pump, a normally closed contact of the float level sensor of the user water tank and a normally open contact of the float level sensor of the sub-water tank, a start relay coil, a normally open contact of the start relay, a start button, and a stop button. The signal loop is connected in series with a normally open contact of the start relay and a red sub-signal lamp; the signal loop is connected in series with a normally closed contact of the start relay and a green sub-signal lamp.

[0034] Embodiment 3

[0035] As Figure 1 shown, taking two user control boxes as an example in this Embodiment 3, the water supply system includes the following three parts:

[0036] (1) The shared water pump system, including: a main water pump in the well and a main water pump starting box;

[0037] (2) The water pump system of User 1, including: solenoid valve DCF1, User 1 control box 1, water tank 1, and float level sensor FQ1;

[0038] (3) The water pump system of User 2, including: solenoid valve DCF2, User 2 control box 2, water tank 2, float level sensors FQ2 / FQ21 / FQ22 of water tank 2, sub-water tanks 21 / 22, float level sensor FQ211 of sub-water tank 21, float level sensor FQ221 of sub-water tank 22, and sub-water pumps 21 / 22.

[0039] Figure 2It is the control circuit diagram of the main water pump starting box. The normally open contacts of the contactors KA1 / KA2 in different user control boxes are connected in parallel and then connected in series to the soft start switch circuit of the main water pump. When the coils of the contactors KA1 / KA2 are energized, the normally open contacts of KA1 / KA2 close, the soft start circuit of the main water pump is turned on, and the main water pump starts.

[0040] Figure 3 It is the control circuit diagram of the control box 1 of user 1. Each user water pump control box control circuit has a water pump control automatic / manual switching circuit, which can better meet the on-site requirements. When the three-position switch S1 is selected to the manual gear, the start button BL1 can be manually pressed to energize the contactor KA1, and the main water pump starts; when the three-position switch S1 is selected to the automatic gear, when the water level in the water tank is lower than the preset value, the floating ball liquid level sensor FQ1 circuit is closed and conducted, the contactor KA1 is energized, and the water pump starts automatically.

[0041] Each user control box control circuit has an independent control circuit for starting their respective user solenoid valves. For example, when the coil of the contactor KA1 is energized, the water pump starts. The normally open contact of KA1 closes, the coil of the solenoid valve relay DCF1 is energized, and the valve of the corresponding user water pipe solenoid valve is opened, so as to realize the independent control of the water inlet of each user water pipe.

[0042] Each user control box control circuit has a self-locking circuit. For example, the self-locking contact (normally open contact of KA1) is connected in parallel with the start button BL1. When the start button BL1 is pressed, the coil of KA1 is energized, the main contacts close, and the main water pump starts to run. At the same time, the self-locking contact also closes, forming a closed circuit. Even if the start button BL1 is released, the coil of the contactor KA1 can still maintain the energized state through the self-locking contact, so as to keep the main water pump running. The normally closed contact of the stop button BD1 is connected in series in the self-locking circuit. When the stop button BD1 is pressed, its normally closed contact is disconnected, the contactor KA1 loses power, and the main water pump stops running.

[0043] Each user control box control circuit has a water pump start-stop signal circuit. The normally open contact of KA1 is connected in series with the red water pump start signal lamp, and the normally closed contact of KA1 is connected in series with the green water pump stop signal. When the coil of the contactor KA1 is energized and the main water pump starts, the normally open contact of KA1 closes, and the red water pump start signal lamp circuit is turned on. When the main water pump stops when the contactor KA1 loses power, the normally closed contact of KA1 closes, and the green water pump stop signal lamp circuit is turned on. Users can monitor the start-stop state of the main water pump through the signal lamp.

[0044] Figure 4It is the control circuit diagram of the control box 2 for User 2. In addition to having the same main water pump control circuit as the control box 1 for User 1, the water pump control box 2 for User 2 also has a sub-water pump control circuit. When the three-position switch is switched to the automatic gear, when the liquid level in the water tank 2 of User 2 is higher than the first preset value, the normally closed contacts of the float level sensors FQ21 / FQ22 are closed; when the liquid level in the sub-water tanks 21 / 22 of User 2 is lower than the second preset value, the normally open contacts of the float level sensors FQ211 / FQ221 are closed. When the liquid level in the water tank 2 of User 2 is higher than the first preset value and at the same time the liquid level in the sub-water tanks 21 / 22 of User 2 is lower than the second preset value, it indicates that the water volume in the water tank 2 of User 2 is sufficient and the water volume in the sub-water tanks 21 / 22 of User 2 is on the low side. Then the series-connected circuit of the normally closed contacts of the float level sensors FQ21 / FQ22 and the normally open contacts of the float level sensors FQ211 / FQ221 is closed. The sub-water pump relays K21 / K22 are energized, and the sub-water pumps 21 / 22 are started, and the water tank 2 of User 2 supplies water to the sub-water tanks 21 / 22 of User 2.

[0045] The content clarified in the above embodiments should be understood that these embodiments are only used to illustrate the present invention more clearly, rather than to limit the scope of the present invention. After reading the present invention, various equivalent forms of modification of this embodiment by those skilled in the art all fall within the scope defined by the appended claims of the present invention.

Claims

1. A multi-user control box shared water pump control system, characterized in that, Comprising: A shared main water pump system and n user control systems; The shared main water pump system includes: a main water pump and a main water pump starting box; the main water pump starting box includes: a soft starter and a main water pump starting control circuit; The i-th user control system includes: an i-th user control box, an i-th user water tank, a solenoid valve DCFi and an i-th user control box control circuit; The i-th user control box includes: a contactor KAi, a selector switch Si, a start button BLi, and a stop button BDi; The i-th user water tank includes: a sensor FQi for detecting the liquid level of the i-th user water tank; The solenoid valve DCFi is used to control the water inlet of the i-th user water tank; The selector switch Si includes an automatic gear and a manual gear; The main water pump starting control circuit includes: one end of the soft starter is connected to the power supply circuit, and the other end is connected to the main water pump motor for controlling the start and stop of the main water pump motor; the normally open contacts of the contactors KA1, KA2,..., KAn of all user control boxes are connected in parallel and are all connected between the power supply circuit and the soft starter; The i-th user control box control circuit includes: the normally open contact of the sensor FQi is connected in series between the coil of the contactor KAi and the automatic gear of the selector switch Si; the start button BLi is connected in series between the coil of the contactor KAi and the manual gear of the selector switch Si, the start button BLi is connected in parallel with the normally open contact of the contactor KAi, and both are connected between the coil of the contactor KAi and the manual gear of the selector switch Si, and the normally closed contact of the stop button BDi is connected in series between the manual gear of the selector switch Si and the start button BLi; The normally closed coil of the solenoid valve DCFi is connected in series with the normally open contact of the contactor KAi; Wherein, 1 ≤ i ≤ n, n is an integer, and n ≥ 2.

2. The multi-user control box shared water pump control system according to claim 1, characterized in that, The i-th user control box further includes: an i-th main water pump start signal lamp and an i-th main water pump stop signal lamp; The i-th user control box control circuit further includes: the normally open contact of the contactor KAi is connected in series with the i-th main water pump start signal lamp, and the normally closed contact of the contactor KAi is connected in series with the i-th main water pump stop signal lamp; The i-th main water pump start signal lamp indicates that the i-th user controls the main water pump to be in the start state, and the i-th main water pump stop signal lamp indicates that the i-th user controls the main water pump to be in the stop state.

3. The multi-user control box common water pump control system according to claim 1, wherein The i-th user control system further includes: m sub-water pump systems; The k-th sub-water pump system includes: a k-th sub-water pump and a k-th sub-water tank; The i-th user control box further includes: a relay K corresponding to the k-th water pump i k , a selector switch S i k , a start button BL i k , a stop button BD i k ; The k-th sub-water tank includes: a sensor FQ i k , which is used to detect the liquid level of the k-th sub-water tank; The water tank of the i-th user further includes: a sensor FQ corresponding to the k-th sub-tank i q , which is used to detect the liquid level of the water tank of the i-th user; The i-th user control box control circuit further includes: m sub-water pump control circuits; The k-th water pump control circuit includes: relay K i k whose coil is connected in series with sensor FQ between the automatic gear of selector switch S i k and the normally closed contact of sensor FQ i q and the normally open contact of sensor FQ i k ; relay K i k whose coil is connected in series with start button BL between the manual gear of selector switch S i k ; start button BL i k is in parallel with the normally open contact of relay K i k and both are connected between the coil of relay K i k and the manual gear of selector switch S i k ; between the manual gear of selector switch S i k and start button BL i k is connected in series with stop button BD i k 's normally closed contact; i k ​ Wherein, 1 ≤ k ≤ m, 1 ≤ q ≤ m, and m ≥ 1.

4. The multi-user control box shared water pump control system according to claim 3, wherein The i-th user control box further includes: a k-th sub-water pump start signal lamp and a k-th sub-water pump stop signal lamp; The k-th sub-water pump control loop further includes: relay K i k The normally open contact of is connected in series with the k-th sub-water pump start signal lamp, and relay K i k The normally closed contact of is connected in series with the k-th sub-water pump stop signal lamp; The k-th sub-water pump start signal lamp indicates that the k-th sub-water pump is in the start state, and the k-th sub-water pump stop signal lamp indicates that the k-th sub-water pump is in the stop state.

5. The multi-user control box common water pump control circuit according to claim 3, wherein The main water pump starting box further includes: a circuit breaker; The main water pump starting control circuit further includes: one end of a circuit breaker is connected to the power supply circuit, and the other end is connected to a parallel circuit of normally open contacts of contactors KA1, KA2, …, KAn of all user control boxes; and / or The i-th user control box further includes: the i-th circuit breaker; The control circuit of the i-th user control box further includes: one end of the i-th circuit breaker is connected to the power supply circuit, and the other end is connected to the selector switch Si; and / or The i-th user control box further includes: the k-th circuit breaker; The k-th sub-pump control circuit further includes: one end of the k-th circuit breaker is connected to the power supply circuit, and the other end is connected to the selector switch S i k .

6. The multi-user control box common water pump control circuit according to claim 3, characterized in that The main water pump starting box further includes: a fuse; The main water pump starting control circuit further includes: the fuse is connected in series to the power supply circuit; and / or The i-th user control box further includes: the i-th fuse; The control circuit of the i-th user control box further includes: the i-th fuse is connected in series to the power supply circuit; and / or The i-th user control box further includes: the k-th fuse; The control circuit of the k-th sub-water pump further includes: the k-th fuse is connected in series to the power supply circuit.

7. The multi-user control box common water pump control circuit according to claim 1, characterized in that The main water pump starting box further includes: a water pump speed governor; the water pump speed governor is connected in parallel with the main water pump starting control circuit.

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