A water pump control switching module

Abstract

The present invention provides a water pump control switching module, which includes a control system connection terminal, a signal transmitter connection terminal, an external power supply connection terminal, a device connection terminal, a mode conversion switch, and a third water pump manual control switch; the switching module is respectively connected to a control system, a signal transmitter, an external power supply, and a device terminal through the control system connection terminal, the signal transmitter connection terminal, the external power supply connection terminal, and the device connection terminal. The switching module is connected to a contactor through the device terminal, and then controls the power supply of the frequency converter to the water pump through the contactor; the water pump control switching module provided by the present invention can drive three water pumps through two frequency converters, and the three water pumps can take turns to stop, and only two are left to work simultaneously; the water pump control switching module provided by the present invention realizes one-key switching between automatic and manual control modes, and one-key switching of water pump selection in the manual mode.

Description

Technical Field

[0001] The present invention belongs to the technical field of automatic control, and particularly relates to a water pump control switching module. Background Art

[0002] In various water circulation systems, one or more redundant water pumps are sometimes equipped to improve the reliability and service life of the system. A typical situation is to equip 3 water pumps, but only 2 of them need to run simultaneously to meet the flow requirements. In the above situation, if a water pump is left idle as a backup for a long time, it is easy to cause equipment damage due to problems such as rust, which is obviously unreasonable. Therefore, in actual use, generally 3 water pumps are made to work and stop alternately, thereby improving the overall life of the water circulation system.

[0003] Since the water pumps operate alternately, equipping each water pump with an individual frequency converter will result in unnecessary cost expenditure. The most ideal situation is to supply power to 3 water pumps through 2 frequency converters. For example: water pump A is driven by frequency converter No. 1, water pump B is driven by frequency converter No. 2, and water pump C is alternately driven by frequency converters No. 1 and No. 2, so that only 2 of the 3 water pumps are running, and each water pump can stop alternately.

[0004] In the above mode, the water pump control system should be able to achieve the following functions through simple operations: (1) manual and automatic modes can be conveniently switched; (2) manual control cannot intervene in the automatic control mode, and the automatic control system cannot intervene in the manual control mode, that is, the modes are interlocked; (3) in the manual mode, it is necessary to ensure that the water pump alternately driven by 2 frequency converters will not be powered by 2 frequency converters simultaneously, eliminating the potential risk of manual misoperation. Summary of the Invention

[0005] In view of this, the present invention aims to overcome the above deficiencies in the prior art and proposes a water pump control switching module.

[0006] To achieve the above object, the technical solution of the present invention is realized as follows:

[0007] A water pump control switching module includes a control system connection end, a signal transmitter connection end, an external power supply connection end, a device connection end, a mode conversion switch, and a third water pump manual control switch; the switching module is respectively connected to the control system, signal transmitter, external power supply, and device end through the control system connection end, signal transmitter connection end, external power supply connection end, and device connection end. The switching module is connected to a contactor through the device end, and then controls the power supply of the frequency converter to the water pump through the contactor;

[0008] The control system connection end includes interface C K1 、C K2 、C K3 、CK4 、C K5 、C K6 、C K7 、C K8 The signal transmitter connection end includes an interface C X1 、C X2 、C X3 、C X4 、C X5 、C X6 、C X7 、C X8 、C X9 、C X10 The external power supply connection terminal includes an interface C D1 、C D2 The device connection end includes an interface C J1 、C J2 、C J3 、C J4 、C J5 、C J6 ;

[0009] The interface C K1 One side is connected to the first automatic mode signal terminal of the control system, and the other side is connected to the normally open switch K 1-1 , then through interface C K2 Access the second automatic mode signal terminal of the control system;

[0010] The interface C K3 、C K4 One side is connected to the third automatic mode signal terminal of the control system and the fourth automatic mode signal terminal of the control system, and the other side is connected to the node C. S10 , and then through the normally open switch K 1-2 Connecting Node C S9 ;

[0011] The node C S9 The other side is divided into two paths, one of which passes through the normally open switch K 2-1 Then connect the common end of switch K4 and the other end through node C S8 Connect the normally open switch K 2-2 , and then connect the common end of switch K3, node C S8 Also through interface C D1 Connect external power supply DC 24V+;

[0012] The switch K3 comprises two contacts, one of which is connected via node C. S11 Connect the positive electrode of diode VD5 and the negative electrode of VD5 to node C S1 ; Interface C K8One side is connected to the automatic operation signal terminal of the first water pump of the control system, and the other side is connected to the positive electrode of diode VD1. The negative electrode of VD1 is also connected to node C. S1 , node C S1 is connected to the first operation signal terminal of the signal transmitter for the first water pump through interface C X1 ; The other contact of switch K3 is connected to the positive electrode of diode VD6 through node C S12 , and the negative electrode of VD6 is connected to node C S2 ; Interface C K7 One side is connected to the first automatic operation signal terminal of the third water pump of the control system, and the other side is connected to the positive electrode of diode VD2. The negative electrode of VD2 is also connected to node C S2 , node C S2 is connected to the first operation signal terminal of the signal transmitter for the third water pump through interface C X2 ;

[0013] The switch K4 includes two contacts. One of the contacts is connected to the positive electrode of diode VD7 through node C S13 , and the negative electrode of VD7 is connected to node C S3 ; Interface C K6 One side is connected to the automatic operation signal terminal of the second water pump of the control system, and the other side is connected to the positive electrode of diode VD3. The negative electrode of VD3 is also connected to node C S3 , node C S3 is connected to the first operation signal terminal of the signal transmitter for the second water pump through interface C X3 ; The other contact of switch K4 is connected to the positive electrode of diode VD8 through node C S14 , and the negative electrode of VD8 is connected to node C S4 ; Interface C K5 One side is connected to the second automatic operation signal terminal of the third water pump of the control system, and the other side is connected to the positive electrode of diode VD4. The negative electrode of VD4 is also connected to node C S4 , node C S4 is connected to the second operation signal terminal of the signal transmitter for the third water pump through interface C X4 ;

[0014] The mode conversion switch is a rotary switch that controls switches K 1-1 , K 1-2 , K 2-1 , K 2-2 ; Among them, the normally open switches K 1-1 , K 1-2 are linked, and both close or open synchronously; the normally open switches K 2-1 , K 2-2 are linked, and both close or open synchronously;

[0015] The third water pump manual control switch is a rotary switch, controlling switches K3 and K4. Each of switches K3 and K4 contains 2 contacts. One contact of switch K3 is connected to C S11 One side is a normally closed contact, connected to C S12 One side is a normally open contact. One contact of switch K4 is connected to C S13 One side is a normally closed contact, connected to C S14 One side is a normally open contact;

[0016] The interface C D1 One side is connected to the external power supply DC 24V+. The other side is divided into two paths through node C S5 One path is connected to node C S8 , and the other path is connected to the device-side DC 24V+ power supply interface through interface C J1 ;

[0017] The interface C D2 One side is connected to the external power supply DC 24V-. The other side is divided into two paths through node C S6 One path is connected to interface C X9 , and through interface C X9 is connected to the negative pole of the primary signal of the signal transmitter. The other path is divided into two paths through node C S7 One path is connected to the negative pole of the secondary signal of the signal transmitter through interface C X10 , and the other path is connected to the device-side DC 24V- power supply interface through interface C J2 ;

[0018] The interface C X5 One side is connected to the secondary operation signal of the first water pump of the signal transmitter. The other side is connected to the operation signal of the first water pump of the device through interface C J3 ;

[0019] The interface C X6 One side is connected to the first and second operation signals of the third water pump of the signal transmitter. The other side is connected to the first operation signal of the third water pump of the device through interface C J4 ;

[0020] The interface C X7 One side is connected to the secondary operation signal of the second water pump of the signal transmitter. The other side is connected to the operation signal of the second water pump of the device through interface C J5 ;

[0021] The interface C X8 One side is connected to the second and second operation signals of the third water pump of the signal transmitter. The other side is connected to the second operation signal of the third water pump of the device through interface C J6 ;

[0022] Further, the mode conversion switch includes three gears: when the knob is in the middle position, all four switches are disconnected; when the knob is rotated counterclockwise, K 1-1 , K 1-2 are disconnected, and K 2-1 , K 2-2 are closed; when the knob is rotated clockwise, K 1-1 , K 1-2 are closed, and K 2-1 , K 2-2 are disconnected;

[0023] Switches K 1-1 , K 1-2 are used to enable the water pump control to enter or exit the automatic mode: when the switch is closed, it enters the automatic mode, and when it is disconnected, it exits the automatic mode;

[0024] Switches K 2-1 , K 2-2 are used to enable the water pump control to enter or exit the manual mode: when the switch is closed, it enters the manual mode, and when it is disconnected, it exits the manual mode.

[0025] Further, the third water pump manual control switch includes three gears: when the knob is in the middle position, both K3 and K4 are connected to the normally closed contacts; when the knob is rotated counterclockwise, K3 is connected to the normally open contact and K4 is connected to the normally closed contact; when the knob is rotated clockwise, K3 is connected to the normally closed contact and K4 is connected to the normally open contact.

[0026] Further, the control system includes a DDC controller.

[0027] Further, four contactors are provided at the device end, which are used to receive the water pump operation signal and drive the contactors to close by using the operation signal, so as to realize the power supply from the frequency converter to the water pump.

[0028] Compared with the prior art, the water pump control switching module of the present invention has the following advantages:

[0029] 1. The water pump control switching module provided by the present invention can drive three water pumps through two frequency converters, and the three water pumps can take turns to stop, leaving only two working simultaneously;

[0030] 2. The water pump control switching module provided by the present invention realizes the one-key switching between the automatic and manual control modes, as well as the one-key switching of the water pump selection in the manual mode;

[0031] 3. The water pump control switching module provided by the present invention realizes the interlock between the manual and automatic control modes, that is, in the automatic control mode, the manual control circuit is cut off; in the manual control mode, the automatic control signal is not connected;

[0032] 4. The water pump control switching module provided by the present invention creates a situation where, in the manual mode, the water pumps alternately driven by two inverters will not be powered by both inverters simultaneously, thus eliminating the potential risk of manual misoperation.

[0033] 5. For the water pump control switching module provided by the present invention, the communication between the peripheral systems and devices connected to it is centrally transmitted through this switching module, making the wiring simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which form a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0035] Figure 1 is a circuit schematic diagram of a water pump control switching module of the present invention;

[0036] Figure 2 is a principle schematic diagram of a water pump control switching module of the present invention;

[0037] Figure 3 is a connection schematic diagram of a water pump control switching module of the present invention and peripheral devices. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] 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.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0040] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art can understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0041] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0042] like Figures 1-2 As shown, the present invention provides a water pump control switching module, including a circuit board, and a control system connection terminal, a signal transmitter connection terminal, an external power supply connection terminal, a device connection terminal, a mode conversion switch, and a third water pump manual control switch provided on the circuit board; the switching module is connected to the control system, the signal transmitter, the external power supply, and the device terminal through the control system connection terminal, the signal transmitter connection terminal, the external power supply connection terminal, and the device connection terminal respectively;

[0043] The control system connection end includes an interface C K1 、C K2 、C K3 、C K4 、C K5 、C K6 、C K7 、C K8 The signal transmitter connection end includes an interface C X1 、C X2 、C X3 、C X4 、C X5 、C X6 、C X7 、C X8 、C X9 、C X10 The external power connection terminal includes an interface C D1 、C D2 The device connection end includes an interface C J1 、C J2 、C J3 、C J4 、C J5 、C J6 ;

[0044] The interface C K1 One side is connected to the first automatic mode signal terminal of the control system, and the other side is connected to the normally open switch K 1-1 , then through interface C K2Second automatic mode signal terminal of the access control system;

[0045] The interface C K3 , C K4 One side is respectively connected to the third automatic mode signal terminal and the fourth automatic mode signal terminal of the control system, and the other side is commonly connected to node C S10 , and then through the normally open switch K 1-2 Connected to node C S9 ;

[0046] The node C S9 The other side is divided into two paths. One path is connected to the common terminal of switch K4 through the normally open switch K 2-1 , and the other path is connected to the normally open switch K through node C S8 , and then connected to the common terminal of switch K3. Node C 2-2 is also connected to the external power supply DC 24V+ through interface C S8 ; D1 The switch K3 includes two contacts. One side contact is connected to the positive pole of diode VD5 through node C

[0047] , and the negative pole of VD5 is connected to node C S11 ; Interface C S1 One side is connected to the first water pump automatic operation signal terminal of the control system, and the other side is connected to the positive pole of diode VD1. The negative pole of VD1 is also connected to node C K8 , node C S1 is connected to the first water pump primary operation signal terminal of the signal transmitter through interface C S1 ; The other side contact of switch K3 is connected to the positive pole of diode VD6 through node C X1 S12 , and the negative pole of VD6 is connected to node C S2 , interface C K7 One side is connected to the first automatic operation signal terminal of the third water pump of the control system, and the other side is connected to the positive pole of diode VD2. The negative pole of VD2 is also connected to node C S2 S2 , node C X2 is connected to the first primary operation signal terminal of the third water pump of the signal transmitter through interface C X2 ;

[0048] The switch K4 includes two contacts. One side contact is connected to the positive pole of diode VD7 through node C S13 , and the negative pole of VD7 is connected to node C <9000161>; Interface C K6 One side is connected to the second water pump automatic operation signal terminal of the control system, and the other side is connected to the positive pole of diode VD3. The negative pole of VD3 is also connected to node C S3 , node C S3 is connected to the signal transmitter through interface C X3Connect the second water pump primary operation signal terminal of the signal transmitter; the contact on the other side of switch K4 passes through node C S14 Connect the positive electrode of diode VD8 and the negative electrode of VD8 to node C S4 ; Interface C K5 One side is connected to the second automatic operation signal terminal of the third water pump of the control system, and the other side is connected to the positive electrode of diode VD4. The negative electrode of VD4 is also connected to node C. S4 , node C S4 Through interface C X4 Connect the signal transmitter to the second primary operation signal terminal of the third water pump;

[0049] The mode conversion switch is a knob switch, and the control switch K 1-1 , K 1-2 , K 2-1 , K 2-2 ; Among them, the normally open switch K 1-1 , K 1-2 Linkage, the two are closed or opened synchronously; normally open switch K 2-1 , K 2-2 Linkage, the two are closed or opened synchronously;

[0050] The third water pump manual control switch is a knob switch, which controls switches K3 and K4. Switches K3 and K4 each have two contacts, wherein the contact of switch K3 is connected to C S11 One side is a normally closed contact, connected to C S12 One side is a normally open contact, and the switch K4 contact is connected to C S13 One side is a normally closed contact, connected to C S14 One side is a normally open contact;

[0051] The interface C D1 One side is connected to the external power supply DC 24V+, and the other side is connected to the external power supply DC 24V+ through the node C S5 Divided into two paths, one connecting to node C S8 , the other way through interface C J1 Connect to the DC 24V+ power supply interface on the device side;

[0052] The interface C D2 One side is connected to the external power supply DC 24V-, and the other side is connected to the external power supply DC 24V- through the node C S6 Divided into two paths, one path connects to interface C X9 , through interface C X9 Connect the negative pole of the primary signal of the signal transmitter and the other pole through node C S7 Divided into two paths, one path through interface C X10 Connect to the negative pole of the secondary signal of the signal transmitter, and the other one is connected through the interface C J2 Connect to the DC 24V power supply interface on the device side;

[0053] The interface C X5 is connected to the first secondary operation signal of the water pump of the signal transmitter on one side, and on the other side, it is connected to the first operation signal of the water pump at the equipment end through the interface C J3 ;

[0054] The interface C X6 is connected to the first secondary operation signal of the third water pump of the signal transmitter on one side, and on the other side, it is connected to the first operation signal of the third water pump at the equipment end through the interface C J4 ;

[0055] The interface C X7 is connected to the secondary operation signal of the second water pump of the signal transmitter on one side, and on the other side, it is connected to the operation signal of the second water pump at the equipment end through the interface C J5 ;

[0056] The interface C X8 is connected to the second secondary operation signal of the third water pump of the signal transmitter on one side, and on the other side, it is connected to the second operation signal of the third water pump at the equipment end through the interface C J6 ;

[0057] Specifically, the mode conversion switch includes three gears: when the knob is in the middle position, all four switches are disconnected; when the knob is rotated counterclockwise, K 1-1 , K 1-2 are disconnected, and K 2-1 , K 2-2 are closed; when the knob is rotated clockwise, K 1-1 , K 1-2 are closed, and K 2-1 , K 2-2 are disconnected;

[0058] The switches K 1-1 , K 1-2 are used to make the water pump control enter or exit the automatic mode: when the switch is closed, it enters the automatic mode, and when it is disconnected, it exits the automatic mode;

[0059] The switches K 2-1 , K 2-2 are used to make the water pump control enter or exit the manual mode: when the switch is closed, it enters the manual mode, and when it is disconnected, it exits the manual mode.

[0060] Specifically, the manual control switch of the third water pump includes three gears: when the knob is in the middle position, K3 and K4 are both connected to the normally closed contacts; when the knob is rotated counterclockwise, K3 is connected to the normally open contact and K4 is connected to the normally closed contact; when the knob is rotated clockwise, K3 is connected to the normally closed contact and K4 is connected to the normally open contact.

[0061] Specifically, the control system includes a DDC controller.

[0062] Specifically, the device end is provided with four contactors, which are used to receive the water pump operation signal and drive the contactors to close by using the operation signal, so as to realize the power supply from the frequency converter to the water pump; among them, one ends of the first contactor, the third contactor, the second contactor, and the fourth contactor are respectively connected to C J3 ~C J6 , that is, connect to the corresponding water pump operation signal, and the other ends are all connected to C J2 , that is, connect to the external power supply DC 24V-. When a certain interface among C J3 ~C J6 receives the DC 24V+ operation signal of the corresponding water pump, the corresponding contactor is powered on and closed, realizing the power supply from the frequency converter to the water pump.

[0063] When in use, after the external power supply is started, DC 24V+ is transmitted to the nodes C S8 and C S9 for automatic and manual control on the one hand, and input to the device end on the other hand; DC 24V- is respectively input to the signal transmitter and the device end.

[0064] The mode conversion switch X1 has 3 gears:

[0065] (1) Stop mode: In this mode, the four switches K 1-1 , K 1-2 , K 2-1 , and K 2-2 are all in the off state. At this time, the control system end does not receive the start signal and cannot output the operation signal (DC 24V+) to the interfaces C K5 ~C K8 ; the switches K3 and K4 are not connected to DC24V+ and cannot output the operation signal to the nodes C S11 ~C S14 . Therefore, all water pumps are in the shutdown state in the stop mode.

[0066] (2) Automatic mode: In this mode, the switches K 1-1 , K 1-2 are closed, and K 2-1 , K 2-2 are kept off. At this time, the first automatic mode signal terminal and the second automatic mode signal terminal at the control system end are short-circuited to form a path of automatic mode start signal; the third automatic mode signal terminal and the fourth automatic mode signal terminal are respectively connected to DC 24V+ to form two paths of automatic mode start signals. Therefore, this module provides 2 modes with a total of 3 paths of automatic mode start signals, which can adapt to various common signal modes of the control system. After receiving the above automatic mode start signal, the control system issues a DC 24V+ operation signal through the interfaces C K5 ~C K8 according to the program setting. At this time, since the switches K 2-1 , K2-2 Disconnected, switches K3 and K4 cannot output operating signals.

[0067] (3) Manual mode: In this mode, switch K 2-1 and K 2-2 are closed, and K 1-1 and K 1-2 remain open. At this time, switches K3 and K4 are connected to DC 24V+. K3 and K4 each have two contacts, and the opening and closing states of the contacts are both controlled by the manual control switch of the third water pump: when the third water pump is in the stop mode, K3 and K4 are respectively connected to C S11 and C S13 , that is, the first water pump and the second water pump are running, and the third water pump is shut down; when the third water pump is in the mode of replacing the first water pump, K3 and K4 are respectively connected to C S12 and C S13 , that is, the third water pump and the second water pump are running, and the first water pump is shut down; when the third water pump is in the mode of replacing the second water pump, K3 and K4 are respectively connected to C S11 and C S14 , that is, the first water pump and the third water pump are running, and the second water pump is shut down. At the same time, since switches K 1-1 and K 1-2 are open, the control system does not receive the automatic mode start command and does not issue the water pump operation signal.

[0068] The primary operation signal from the control system terminal interface C K5 to C K8 or the control switching module node C S11 to C S14 is input to the signal transmitter through the interface C X1 to C X4 , and a secondary operation signal is formed through the signal transmitter, and then transmitted to the equipment end through the interface C X5 to C X8 . The secondary operation signal is used to control the corresponding contactor to close, and the water pump is connected to the corresponding frequency converter through the contactor, as Figure 2 shown. There are two reasons for using the signal transmitter: First, it can support contactors with a working voltage higher than DC 24V+; second, the signal transmitter can isolate the contactor control signal (i.e., the water pump operation signal) from the main body of the control switching module, and play a certain protective role for the main body of the switching module when the contactor has overvoltage and other situations.

[0069] In summary, it can be seen that the system can achieve one-key switching between the automatic control and manual control modes. Among the two modes, at most only one can run, realizing the interlock between the two modes. In the manual mode, the third water pump can only replace one of the first water pump or the second water pump, that is, it will not be powered by two frequency converters at the same time.

[0070] Diodes VD1 - VD8 are used to isolate the manual operation signal and the automatic operation signal of the water pump to prevent them from affecting each other. In particular, it is used to avoid the manual operation signal being transmitted to the automatic operation signal terminal of the water pump in the control system to prevent interference or damage to the control system.

[0071] In addition, it can be seen that the communication between the peripheral systems and devices such as the control system, signal transmitter, controlled device, and external power supply connected to this module is all centrally transmitted through this switching module. As Figure 3 shown, this makes the on-site wiring simpler, less prone to errors, and has higher reliability.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A water pump control switching module, characterized in that: It includes a control system connection terminal, a signal transmitter connection terminal, an external power supply connection terminal, a device connection terminal, a mode conversion switch, and a third water pump manual control switch; the switching module is respectively connected to the control system, the signal transmitter, the external power supply, and the device terminal through the control system connection terminal, the signal transmitter connection terminal, the external power supply connection terminal, and the device connection terminal. The switching module is connected to the contactor through the device terminal, and then controls the power supply of the frequency converter to the water pump through the contactor; The connection terminal of the control system includes interface C K1 、C K2 、C K3 、C K4 、C K5 、C K6 、C K7 、C K8 ; The connection terminal of the signal transmitter includes interface C X1 、C X2 、C X3 、C X4 、C X5 、C X6 、C X7 、C X8 、C X9 、C X10 , The connection terminal of the external power supply includes interface C D1 、C D2 , The connection terminal of the device includes interface C J1 、C J2 、C J3 、C J4 、C J5 、C J6 ; The interface C K1 is connected to the first automatic mode signal terminal of the control system on one side, and on the other side, it first passes through the normally open switch K 1-1 , and then through the interface C K2 to access the second automatic mode signal terminal of the control system; The interface C K3 , C K4 One side is respectively connected to the third automatic mode signal terminal and the fourth automatic mode signal terminal of the control system, and the other side is commonly connected to node C S10 , and then through the normally open switch K 1-2 connected to node C S9 ; The said node C S9 On the other side, it is divided into two paths. One path passes through the normally open switch K 2-1 and then connects to the common terminal of switch K4. The other path passes through node C S8 to connect to the normally open switch K 2-2 , and further connects to the common terminal of switch K3. Node C S8 also connects to the external power supply DC24V+ through interface C D1 ; The switch K3 includes two contacts. One side contact is connected to the positive electrode of the diode VD5 through the node C S11 and the negative electrode of VD5 is connected to the node C S1 ; The interface C K8 is connected to the first water pump automatic operation signal terminal of the control system on one side and the positive electrode of the diode VD1 on the other side, and the negative electrode of VD1 is also connected to the node C S1 , and the node C S1 is connected to the first water pump primary operation signal terminal of the signal transmitter through the interface C X1 ; The other side contact of the switch K3 is connected to the positive electrode of the diode VD6 through the node C S12 and the negative electrode of VD6 is connected to the node C S2 ; The interface C K7 is connected to the first automatic operation signal terminal of the third water pump of the control system on one side and the positive electrode of the diode VD2 on the other side, and the negative electrode of VD2 is also connected to the node C S2 , and the node C S2 is connected to the first primary operation signal terminal of the third water pump of the signal transmitter through the interface C X2 . The switch K4 includes two contacts, and one side contact is connected to the positive electrode of the diode VD7 through the node C S13 The negative electrode of VD7 is connected to the node C S3 ; The interface C K6 One side is connected to the second water pump automatic operation signal terminal of the control system, and the other side is connected to the positive electrode of the diode VD3. The negative electrode of VD3 is also connected to the node C S3 , The node C S3 is connected to the second water pump primary operation signal terminal of the signal transmitter through the interface C X3 ; The other side contact of the switch K4 is connected to the positive electrode of the diode VD8 through the node C S14 The negative electrode of VD8 is connected to the node C S4 ; The interface C K5 One side is connected to the third water pump second automatic operation signal terminal of the control system, and the other side is connected to the positive electrode of the diode VD4. The negative electrode of VD4 is also connected to the node C S4 , The node C S4 is connected to the third water pump second primary operation signal terminal of the signal transmitter through the interface C X4 ; The mode conversion switch is a rotary switch that controls switches K 1-1 , K 1-2 , K 2-1 , K 2-2 ; among which the normally open switches K 1-1 , K 1-2 are linked, and both are closed or opened synchronously; the normally open switches K 2-1 , K 2-2 are linked, and both are closed or opened synchronously; The third water pump manual control switch is a rotary switch, controlling switches K3 and K4. Each of switches K3 and K4 contains 2 contacts. One side of the contacts of switch K3 is a normally closed contact, connecting to C S11 and the other side is a normally open contact. One side of the contacts of switch K4 is a normally closed contact, connecting to C S12 and the other side is a normally open contact; S13 One side of the contacts of switch K4 is a normally closed contact, connecting to C S14 and the other side is a normally open contact; The interface C D1 is connected to the external power supply DC 24V+ on one side, and on the other side, through node C S5 it is divided into two paths. One path is connected to node C S8 , and the other path is connected to the device-side DC 24V+ power supply interface through interface C J1 ; The interface C D2 is connected to the external power supply DC 24V- on one side, and on the other side, it is divided into two paths through node C S6 One path is connected to the interface C X9 and through the interface C X9 it is connected to the negative pole of the primary signal of the signal transmitter. The other path is divided into two paths through node C S7 One path is connected to the negative pole of the secondary signal of the signal transmitter through the interface C X10 and the other path is connected to the DC 24V- power supply interface of the device end through the interface C J2 ; The interface C X5 is connected to the first water pump secondary operation signal of the signal transmitter on one side, and on the other side, it is connected to the first water pump operation signal of the equipment end through the interface C J3 ; The interface C X6 is connected to the first and second operation signals of the third water pump of the signal transmitter on one side, and is connected to the first operation signal of the third water pump of the device end through the interface C J4 on the other side; The interface C X7 is connected to the second water pump secondary operation signal of the signal transmitter on one side, and on the other side, it is connected to the second water pump operation signal of the equipment end through the interface C J5 ; The interface C X8 is connected to the third water pump's second secondary operation signal of the signal transmitter on one side, and on the other side, it is connected to the third water pump's second operation signal of the device end through the interface C J6 ​ 2. The water pump control switching module according to claim 1, characterized in that: The mode conversion switch includes three gears: when the knob is in the middle position, all four switches are off; when the knob is rotated counterclockwise, K 1-1 , K 1-2 are off, and K 2-1 , K 2-2 are on; when the knob is rotated clockwise, K 1-1 , K 1-2 are on, and K 2-1 , K 2-2 are off; Switch K 1-1 , K 1-2 For enabling the water pump control to enter or exit the automatic mode: when the switch is closed, it enters the automatic mode; when it is opened, it exits the automatic mode. Switch K 2-1 , K 2-2 Used to enable the water pump control to enter or exit the manual mode: when the switch is closed, it enters the manual mode, and when it is open, it exits the manual mode.

3. The water pump control switching module according to claim 1, characterized in that: The third water pump manual control switch has three gears: when the knob is in the middle position, both K3 and K4 are connected to the normally closed contacts; when the knob is rotated counterclockwise, K3 is connected to the normally open contact and K4 is connected to the normally closed contact; when the knob is rotated clockwise, K3 is connected to the normally closed contact and K4 is connected to the normally open contact.

4. The water pump control switching module according to claim 1, wherein: The control system includes a DDC controller.

5. A water pump control switching module according to claim 1, characterized in that: Four contactors are provided at the device terminal, which are used to receive the water pump operation signal and drive the contactor to close by using the operation signal to realize the power supply of the frequency converter to the water pump.

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