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 first / third water pump mode switching switch, and a second / fourth water pump mode switching switch. The switching module is respectively connected to the control system, the signal transmitter, the external power supply, and the device end 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 end, and then controls the power supply of the frequency converter to the water pump through the closing of the contactor. The present invention provides a water pump control switching module, which can drive four water pumps through two frequency converters, and the four pumps can take turns to stop, only two pumps work simultaneously. The water pump control switching module provided by the present invention realizes the one-key switching between automatic and manual control modes.

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 common situation is to equip 4 water pumps, but only 2 of them need to run simultaneously to meet the flow requirements. In the above situation, if 2 pumps are left idle as backups 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 4 pumps work and stop alternately, so as to improve the overall life of the water circulation system.

[0003] Since the water pumps operate alternately, equipping each water pump with an inverter separately will cause unnecessary cost expenditures. Ideally, the power supply for 4 water pumps is achieved through 2 inverters. For example, water pumps A and B are driven by the 1st inverter, and water pumps C and D are driven by the 2nd inverter, so that only 2 of the 4 water pumps are running, and each 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 switched conveniently; (2) The manual / automatic mode switching of water pumps A and B is independently controlled from that of water pumps C and D, without mutual influence, so as to prevent the entire automatic control system from failing due to a fault of one water pump; (3) For any water pump, 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. 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 terminal, a signal transmitter connection terminal, an external power supply connection terminal, an equipment connection terminal, a first / third water pump mode switching switch, and a second / fourth water pump mode switching switch. The switching module is respectively connected to the control system, the signal transmitter, the external power supply, and the equipment terminal through the control system connection terminal, the signal transmitter connection terminal, the external power supply connection terminal, and the equipment connection terminal. The switching module is connected to a contactor through the equipment terminal, and then controls the power supply of the water pump through the contactor;

[0008] The control system connection terminal 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 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 closed switch K 3-1 , K 1-1 After connecting node C S8 ;

[0010] The interface C K2 One side is connected to the second automatic mode signal terminal of the control system, and the other side is connected to the normally closed switch K 4-1 , K 2-1 After connecting node C S9 , and then connect to node C S8 ;

[0011] The interface C K3 One side is connected to the third automatic mode signal terminal of the control system, and the other side is connected in series with resistors R0, R1, and R2, and then connected through interface C K4 Connect the fourth automatic mode signal terminal of the control system, normally closed switch K 3-2 , K 1-2 After connecting in series, pass through node C S14 、C S15 In parallel with R1, normally closed switch K 4-2 , K 2-2 After connecting in series, pass through node C S16 、C S17 In parallel with R2;

[0012] The node C S8 Also directly connected to node C S10 、C S11 , where: Node CS10 Through the normally open switch K 1-3 Connect the positive electrode of the diode VD5, and the negative electrode of VD5 is connected to the node C S1 ; Interface C K8 One 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 the diode VD1. The negative electrode of VD1 is also connected to the node C S1 , Node C S1 Through interface C X1 Connect to the primary start signal terminal of the first water pump of the signal transmitter;

[0013] The node C S11 Through the normally open switch K 3-3 Connect the positive electrode of the diode VD6, and the negative electrode of VD6 is connected to the node C S2 ; Interface C K7 One side is connected to the automatic operation signal terminal of the third water pump of the control system, and the other side is connected to the positive electrode of the diode VD2. The negative electrode of VD2 is also connected to the node C S2 , Node C S2 Through interface C X2 Connect to the primary start signal terminal of the third water pump of the signal transmitter;

[0014] The node C S9 Is also directly connected to the node C S12 、C S13 , Where: Node C S12 Through the normally open switch K 2-3 Connect the positive electrode of the diode VD7, and the negative electrode of VD7 is connected to the 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 the diode VD3. The negative electrode of VD3 is also connected to the node C S3 , Node C S3 Through interface C X3 Connect to the primary start signal terminal of the second water pump of the signal transmitter;

[0015] The node C S13 Through the normally open switch K 4-3 Connect the positive electrode of the diode VD8, and the negative electrode of VD8 is connected to the node C S4 ; Interface C K5 One side is connected to the automatic operation signal terminal of the fourth water pump 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 , Node C S4 Through interface C X4 Connect to the primary start signal terminal of the fourth water pump of the signal transmitter;

[0016] The first / third water pump mode switching switch is a knob switch, control switch K 1-1 、K1-2 , K 1-3 , K 3-1 , K 3-2 , K 3-3 , where the normally closed switch K 1-1 , K 1-2 and the normally open switch K 1-3 are linked, and the open / closed state of K 1-1 , K 1-2 is always opposite to that of K 1-3 ; the normally closed switch K 3-1 , K 3-2 and the normally open switch K 3-3 are linked, and the open / closed state of K 3-1 , K 3-2 is always opposite to that of K 3-3 ;

[0017] The second / fourth water pump mode switch is a rotary switch, controlling the switches K 2-1 , K 2-2 , K 2-3 , K 4-1 , K 4-2 , K 4-3 , where the normally closed switch K 2-1 , K 2-2 and the normally open switch K 2-3 are linked, and the open / closed state of K 2-1 , K 2-2 is always opposite to that of K 2-3 ; the normally closed switch K 4-1 , K 4-2 and the normally open switch K 4-3 are linked, and the open / closed state of K 4-1 , K 4-2 is always opposite to that of K 4-3 ;

[0018] One side of the interface C D1 is connected to the external power supply DC 24V+, and the other side is divided into two paths through the node C S5 , one path is connected to the node C S8 , and the other path is connected to the device-side DC 24V+ power supply interface through the interface C J1 ;

[0019] One side of the interface C D2 is connected to the external power supply DC 24V-, and the other side is divided into two paths through the node C S6 , one path is connected to the interface C X9 , and the primary signal negative pole of the signal transmitter is accessed through the interface C X9 , and the other path is divided into two paths through the node C S7 , one path is through the interface C X10Connect to the negative pole of the secondary signal of the access signal transmitter, and the other path passes through Interface C J2 Connect to the DC 24V- power supply interface at the device end;

[0020] The said Interface C X5 One side is connected to the secondary start signal terminal of the first water pump of the signal transmitter, and the other side passes through Interface C J3 Connect to the start signal terminal of the first water pump at the device end;

[0021] The said Interface C X6 One side is connected to the secondary start signal terminal of the third water pump of the signal transmitter, and the other side passes through Interface C J4 Connect to the start signal terminal of the third water pump at the device end;

[0022] The said Interface C X7 One side is connected to the secondary start signal terminal of the second water pump of the signal transmitter, and the other side passes through Interface C J5 Connect to the start signal terminal of the second water pump at the device end;

[0023] The said Interface C X8 One side is connected to the secondary start signal terminal of the fourth water pump of the signal transmitter, and the other side passes through Interface C J6 Connect to the start signal terminal of the fourth water pump at the device end.

[0024] Furthermore, the first / third water pump mode switch includes three gears: when in the middle position, K 1-1 , K 1-2 , K 3-1 , K 3-2 are closed, and K 1-3 , K 3-3 are open; when the knob is rotated counterclockwise, K 1-1 , K 1-2 , K 3-3 are open, and K 3-1 , K 3-2 , K 1-3 are closed; when the knob is rotated clockwise, K 1-1 , K 1-2 , K 3-3 are closed, and K 3-1 , K 3-2 , K 1-3 are open.

[0025] Furthermore, the second / fourth water pump mode switch includes three gears: when in the middle position, K 2-1 , K 2-2 , K 4-1 , K 4-2 are closed, and K 2-3 , K 4-3 are open; when the knob is rotated counterclockwise, K 2-1 , K2-2 , K 4-3 Disconnect, K 4-1 , K 4-2 , K 2-3 Closed; when the knob is turned clockwise, K 2-1 , K 2-2 , K 4-3 Closed, K 4-1 , K 4-2 , K 2-3 disconnect.

[0026] Furthermore, the switch K 1-1 , K 1-2 and K 3-1 , K 3-2 Used to make the first and third water pumps enter or exit the automatic control mode: when all switches are closed, the first and third water pumps enter the automatic control mode; if any one of the switches is disconnected, the first and third water pumps will exit the automatic control mode at the same time and enter the manual control mode;

[0027] The switch K 2-1 , K 2-2 and K 4-1 , K 4-2 Used to make the second and fourth water pumps enter or exit the automatic control mode: when all switches are closed, the second and fourth water pumps enter the automatic control mode; if any one of the switches is disconnected, the second and fourth water pumps will exit the automatic control mode at the same time and enter the manual control mode;

[0028] The switch K 1-3 , K 2-3 , K 3-3 , K 4-3 They correspond to the manual operation instructions of the first to fourth water pumps respectively. When the switch is closed, the corresponding water pump is manually started.

[0029] Furthermore, the control system includes a DDC controller.

[0030] Furthermore, the device end is provided with four contactors for receiving a water pump start signal and using the start signal to drive the contactors to close, thereby enabling the frequency converter to supply power to the water pump.

[0031] Compared with the prior art, the water pump control switching module created by the present invention has the following advantages:

[0032] 1. The present invention provides a water pump control switching module that can drive four water pumps through two inverters, and the four pumps can be shut down in turn, leaving only two pumps working at the same time;

[0033] 2. The water pump control switching module provided by the invention realizes one-button switching between automatic and manual control modes;

[0034] 3. The pump control switching module provided by the present invention has independent manual / automatic modes for the pumps belonging to the two inverters. That is, when the pump corresponding to one inverter has to be switched to the manual mode due to reasons, the pump corresponding to the other inverter can still maintain the automatic mode.

[0035] 4. The 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.

[0036] 5. For the 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

[0037] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0038] Figure 1 is the circuit diagram of a pump control switching module of the present invention;

[0039] Figure 2 is the schematic diagram of the principle of a pump control switching module of the present invention;

[0040] Figure 3 is the connection schematic diagram of a pump control switching module of the present invention and peripheral devices. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] 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.

[0042] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are 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. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, 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 stated, the meaning of "a plurality" is two or more.

[0043] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0044] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0045] As Figure 1 shown, the present invention provides a water pump control switching module, which includes a circuit board, and a control system connection terminal, a signal transmitter connection terminal, an external power connection terminal, a device connection terminal, a first / third water pump mode switching switch, and a second / fourth water pump mode switching switch provided on the circuit board. The switching module is respectively connected to a control system, a signal transmitter, an external power supply, and a device end through the control system connection terminal, the signal transmitter connection terminal, the external power connection terminal, and the device connection terminal. The switching module is connected to a contactor through the device end, and further controls the power supply of the frequency converter to the water pump through the suction of the contactor;

[0046] The control system connection terminal includes interface C K1 、C K2 、C K3 、C K4 、C K5 、C K6 、C K7 、C K8 ;The signal transmitter connection terminal includes interface C X1 、CX2 , C X3 , C X4 , C X5 , C X6 , C X7 , C X8 , C X9 , C X10 , the external power connection terminal includes interface C D1 , C D2 , the device connection terminal includes interface C J1 , C J2 , C J3 , C J4 , C J5 , C J6 ;

[0047] The interface C K1 is connected to the first automatic mode signal terminal of the control system on one side, and is connected to node C through the normally closed switches K 3-1 , K 1-1 in sequence on the other side. S8 ;

[0048] The interface C K2 is connected to the second automatic mode signal terminal of the control system on one side, and is connected to node C through the normally closed switches K 4-1 , K 2-1 in sequence on the other side, and then connected to node C S9 , and further connected to node C S8 ;

[0049] The interface C K3 is connected to the third automatic mode signal terminal of the control system on one side, and is connected in series with resistors R0, R1, and R2 in sequence on the other side, and then connected to the fourth automatic mode signal terminal of the control system through interface C K4 . The normally closed switches K 3-2 , K 1-2 are connected in series and then connected in parallel with R1 through node C S14 , C S15 . The normally closed switches K 4-2 , K 2-2 are connected in series and then connected in parallel with R2 through node C S16 , C S17 ;

[0050] The node C S8 is also directly connected to node C S10 , C S11 , where: node C S10 is connected to the positive electrode of diode VD5 through the normally open switch K 1-3 , and the negative electrode of VD5 is connected 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 pole of the diode VD1. The negative pole of VD1 is also connected to the node C S1 , the node C S1 is connected to the primary start signal terminal of the first water pump of the signal transmitter through the interface C X1 ;

[0051] The said node C S11 is connected to the positive pole of the diode VD6 through the normally open switch K 3-3 , and the negative pole of VD6 is connected to the node C S2 ; The interface C K7 One side is connected to the automatic operation signal terminal of the third water pump of the control system, and the other side is connected to the positive pole of the diode VD2. The negative pole of VD2 is also connected to the node C S2 , the node C S2 is connected to the primary start signal terminal of the third water pump of the signal transmitter through the interface C X2 ;

[0052] The said node C S9 is also directly connected to the node C S12 、C S13 , where: the node C S12 is connected to the positive pole of the diode VD7 through the normally open switch K 2-3 , and the negative pole of VD7 is connected to the node C S3 ; The 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 pole of the diode VD3. The negative pole of VD3 is also connected to the node C S3 , the node C S3 is connected to the primary start signal terminal of the second water pump of the signal transmitter through the interface C X3 ;

[0053] The said node C S13 is connected to the positive pole of the diode VD8 through the normally open switch K 4-3 , and the negative pole of VD8 is connected to the node C S4 ; The interface C K5 One side is connected to the automatic operation signal terminal of the fourth water pump of the control system, and the other side is connected to the positive pole of the diode VD4. The negative pole of VD4 is also connected to the node C S4 , the node C S4 is connected to the primary start signal terminal of the fourth water pump of the signal transmitter through the interface C X4 ;

[0054] The said first / third water pump mode switch is a rotary switch, controlling the switches K 1-1 、K 1-2 、K 1-3 、K 3-1 、K 3-2 、K 3-3 , among which, the normally closed switch K1-1 , K 1-2 and normally open switch K 1-3 are linked. The on / off state of K 1-1 , K 1-2 is always opposite to that of K 1-3 ; The normally closed switch K[[ID=**12**]] 3-1 , K 3-2 and normally open switch K 3-3 are linked. The on / off state of K 3-1 , K 3-2 is always opposite to that of K 3-3 ;

[0055] The second / fourth water pump mode switching switch is a rotary switch, controlling switches K 2-1 , K 2-2 , K 2-3 , K 4-1 , K 4-2 , K 4-3 , where the normally closed switch K 2-1 , K 2-2 and normally open switch K 2-3 are linked. The on / off state of K 2-1 , K 2-2 is always opposite to that of K 2-3 ; The normally closed switch K 4-1 , K 4-2 and normally open switch K 4-3 are linked. The on / off state of K 4-1 , K 4-2 is always opposite to that of K 4-3 ;

[0056] The interface C D1 is connected to the external power supply DC 24V+ on one side, and is divided into two paths through the node C S5 on the other side. One path is connected to the node C S8 , and the other path is connected to the device-side DC 24V+ power supply interface through the interface C J1 ;

[0057] The interface C D2 is connected to the external power supply DC 24V- on one side, and is divided into two paths through the node C S6 on the other side. One path is connected to the interface C X9 , and is connected to the negative pole of the primary signal of the signal transmitter through the interface C X9 . The other path is divided into two paths through the 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 device-side DC 24V- power supply interface through the interface C J2 ;

[0058] The interface C X5One side is connected to the second start signal terminal of the first water pump of the signal transmitter, and the other side is connected to the first water pump start signal terminal of the equipment end through interface C J3 ;

[0059] The said interface C X6 One side is connected to the second start signal terminal of the third water pump of the signal transmitter, and the other side is connected to the third water pump start signal terminal of the equipment end through interface C J4 ;

[0060] The said interface C X7 One side is connected to the second start signal terminal of the second water pump of the signal transmitter, and the other side is connected to the second water pump start signal terminal of the equipment end through interface C J5 ;

[0061] The said interface C X8 One side is connected to the second start signal terminal of the fourth water pump of the signal transmitter, and the other side is connected to the fourth water pump start signal terminal of the equipment end through interface C J6 ;

[0062] Specifically, the first / third water pump mode switch includes three gears: when in the middle position, K 1-1 , K 1-2 , K 3-1 , K 3-2 are closed, and K 1-3 , K 3-3 are open; when the knob is rotated counterclockwise, K 1-1 , K 1-2 , K 3-3 are open, and K 3-1 , K 3-2 , K 1-3 are closed; when the knob is rotated clockwise, K 1-1 , K 1-2 , K 3-3 are closed, and K 3-1 , K 3-2 , K 1-3 are open.

[0063] Specifically, the second / fourth water pump mode switch includes three gears: when in the middle position, K 2-1 , K 2-2 , K 4-1 , K 4-2 are closed, and K 2-3 , K 4-3 are open; when the knob is rotated counterclockwise, K 2-1 , K 2-2 , K 4-3 are open, and K 4-1 , K 4-2 , K 2-3 are closed; when the knob is rotated clockwise, K 2-1 , K2-2 , K 4-3 closes, K 4-1 , K 4-2 , K 2-3 disconnects.

[0064] Furthermore, the switch K 1-1 , K 1-2 and K 3-1 , K 3-2 are used to enable the first and third water pumps to enter or exit the automatic control mode: when all the switches are closed, the first and third water pumps enter the automatic control mode, and when any one group is disconnected, the first and third water pumps simultaneously exit the automatic control mode and enter the manual control mode;

[0065] The switch K 2-1 , K 2-2 and K 4-1 , K 4-2 are used to enable the second and fourth water pumps to enter or exit the automatic control mode: when all the switches are closed, the second and fourth water pumps enter the automatic control mode, and when any one group is disconnected, the second and fourth water pumps simultaneously exit the automatic control mode and enter the manual control mode;

[0066] The switch K 1-3 , K 2-3 , K 3-3 , K 4-3 respectively correspond to the manual operation instructions of the first to fourth water pumps. When the switch is closed, the corresponding water pump is manually started.

[0067] Specifically, the control system includes a DDC controller.

[0068] Specifically, the device end is provided with four contactors, which are used to receive the water pump start signal and use the start signal to drive the contactor to close, so as to realize the power supply of 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, connected to the corresponding water pump start signal, and the other ends are all connected to C J2 , that is, connected to the external power supply DC 24V-. When a certain interface in C J3 ~C J6 receives the DC 24V+ operation signal of the corresponding water pump, its corresponding contactor is powered on and closed, so as to realize the power supply of the frequency converter to the water pump.

[0069] In use, the present invention is used to realize the control of 4 water pumps by 2 frequency converters, wherein: the first and third water pumps are driven by the first frequency converter, and the second and fourth water pumps are driven by the second frequency converter. The 2 water pumps corresponding to each frequency converter start and stop alternately, that is, only 2 of the 4 water pumps remain working.

[0070] After the external power supply is started, DC 24V+ is transmitted to node C on the one hand S8 、C S9 for automatic and manual control, and on the other hand, it is input to the device end; DC 24V- is respectively input to the signal transmitter and the device end.

[0071] This control switching module provides the following two automatic mode start signals for the control system to be compatible with different models of control systems:

[0072] (1) Method 1: The first automatic mode signal terminal and the second automatic mode signal terminal adopt positive pressure (DC 24V+) digital signals. Among them, the first automatic mode signal terminal is used to control the first water pump and the third water pump corresponding to the first frequency converter to enter the automatic control mode, and the second automatic mode signal terminal is used to control the second water pump and the fourth water pump corresponding to the second frequency converter to enter the automatic control mode.

[0073] (2) Method 2: The third automatic mode signal terminal and the fourth automatic mode signal terminal form a loop, with resistors R0, R1, and R2 connected in series in the middle, and the resistance values of the three are different. Among them, R1 corresponds to the first water pump and the third water pump, and R2 corresponds to the second water pump and the fourth water pump. When all the water pumps are in the automatic control state, both R1 and R2 are short-circuited, and only Rθ is connected to the circuit. When one or all two groups of water pumps need to enter the manual mode, by changing the corresponding knob switch gear, the short-circuit wire of the corresponding resistor is disconnected, so that the resistor is connected to the circuit. By reading the total resistance value (or the corresponding current value) of the loop between the third automatic mode signal terminal and the fourth automatic mode signal terminal, the control system can analyze whether R1 and R2 are connected through the analog parameter input, and then confirm the water pumps that need to be automatically controlled.

[0074] The specific operation method is as follows:

[0075] The first / third water pump mode switching switch X1 has 3 gears:

[0076] (1) Automatic mode: In this mode, K 1-1 、K 1-2 、K 2-1 、K 2-2 are closed, and K 1-3 、K 2-3 are disconnected. At this time, interface C K1 is connected to the external power supply DC 24V+, and the first automatic mode signal terminal receives the DC 24V+ signal; the resistor R1 is short-circuited by the switches K 1-2 and K 3-2 , and the third automatic mode signal terminal and the fourth automatic mode signal terminal receive the corresponding analog signals. The above two signals both correspond to the automatic control mode of the first water pump and the third water pump. The control system, according to the program setting, passes through interface CK8 or C K7 separately send an automatic operation signal to node C S1 or C S2 Output an automatic operation signal. Since switch K 1-3 、K 3-3 is disconnected, it is impossible to send a manual operation signal to node C S1 、C S2 Output a manual operation signal.

[0077] (2) First water pump operation mode: In this mode, K 1-1 、K 1-2 、K 3-3 are disconnected, and K 3-1 、K 3-2 、K 1-3 are closed. At this time, due to K 1-1 being disconnected, there is no DC 24V+ signal at interface C K1 ; due to K 1-2 being disconnected, resistor R1 is connected to the corresponding circuit, and the third automatic mode signal terminal and the fourth automatic mode signal terminal receive corresponding analog signals. The above two signals both correspond to the first water pump and the third water pump exiting the automatic mode. Since switch K 1-3 is closed, node C S1 receives a DC 24V+ start signal, that is, the first water pump operates in the manual mode, while the third water pump does not start because switch K 3-3 is disconnected and there is no operation signal.

[0078] (3) Third water pump operation mode: The operation principle is the same as that of the first water pump. Switches K 3-1 、K 3-2 are disconnected, and the first water pump and the third water pump exit the automatic mode. Switch K 3-3 is turned on, and the third water pump operates in the manual mode. The first water pump does not start because switch K 1-3 is disconnected and there is no operation signal.

[0079] Similarly, the second / fourth water pump mode switch X2 also has three gears: automatic mode, second water pump operation mode, and fourth water pump operation mode. The operation method is the same as the principle of mode switch X1 and will not be elaborated.

[0080] In addition, it can be seen that the manual and automatic controls of the first water pump and the third water pump are completely independent of the second water pump and the fourth water pump. The controls of the two groups of pumps are independent of each other. When the first water pump and the third water pump need to exit the automatic control due to reasons, the second water pump and the fourth water pump can still maintain the automatic control, and vice versa.

[0081] From the interface C K5 ~C K8 of the control system end or the node C S11 ~C S14The primary start signal passes through interface C X1 ~C X4 to the input signal transmitter, and a secondary start signal is formed through the signal transmitter, and then passes through interface C X5 ~C X8 and is transmitted to the device end. The secondary start 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.

[0082] In summary, it can be seen that the manual / automatic control modes of the first water pump, the third water pump and the second water pump, the fourth water pump can be switched with one key respectively. For the same group of water pumps, at most only one of the two modes can operate, realizing the interlock between the two modes. And, the manual / automatic modes of the water pumps belonging to the two frequency converters are independent of each other, that is, when the water pump corresponding to one frequency converter has to be switched to the manual mode due to a fault, the water pump corresponding to the other frequency converter can still maintain the automatic mode.

[0083] 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. Especially to avoid that when the manual operation signal starts, the DC 24V+ signal is transmitted to the automatic operation signal end of the control system, causing interference or damage to the control system.

[0084] In addition, it can be seen that the communication between the peripheral systems and devices connected to this module is all centrally transmitted through this switching module, as Figure 3 shown, which can make the on-site wiring simpler, not easy to make mistakes, and has extremely high reliability.

[0085] The above is only a preferred embodiment of the present invention, and it 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 in 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 first / third water pump mode switch, and a second / fourth water pump mode 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 further controls the power supply of the frequency converter to the water pump by the suction of 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 is sequentially connected to the node C through the normally closed switches K 3-1 , K 1-1 ; S8 ; The interface C K2 is connected to the second automatic mode signal terminal of the control system on one side, and on the other side, it is sequentially connected to the node C 4-1 through the normally closed switch K 2-1 and K S9 and then connected to the node C S8 ; The interface C K3 is connected to the third automatic mode signal terminal of the control system on one side, and on the other side, resistors R0, R1, and R2 are connected in series in turn, and then through the interface C K4 is connected to the fourth automatic mode signal terminal of the control system, and the normally closed switches K 3-2 , K 1-2 are connected in series and then through the node C S14 , C S15 are connected in parallel with R1, and the normally closed switches K 4-2 , K 2-2 are connected in series and then through the node C S16 , C S17 are connected in parallel with R2; The node C S8 is also directly connected to the node C S10 、C S11 , where: the node C S10 is connected to the positive electrode of the diode VD5 through a normally open switch K 1-3 , the negative electrode of VD5 is connected to the node C S1 ; the interface C K8 is connected to the automatic operation signal terminal of the first water pump of the control system on one side, and the positive electrode of the diode VD1 on the other side. The negative electrode of VD1 is also connected to the node C S1 , the node C S1 is connected to the first start signal terminal of the first water pump of the signal transmitter through the interface C X1 . The node C S11 is connected to the positive electrode of the diode VD6 through the normally open switch K 3-3 , and the negative electrode of the VD6 is connected to the node C S2 ; The interface C K7 is connected to the automatic operation signal terminal of the third water pump of the control system on one side, and to the positive electrode of the diode VD2 on the other side. The negative electrode of the VD2 is also connected to the node C S2 , and the node C S2 is connected to the primary start signal terminal of the third water pump of the signal transmitter through the interface C X2 ; The node C S9 is also directly connected to the node C S12 , C S13 , where: the node C S12 is connected to the positive electrode of the diode VD7 through a normally open switch K 2-3 , and the negative electrode of VD7 is connected to the node C S3 ; the interface C K6 is connected to the automatic operation signal terminal of the second water pump of the control system on one side, and to the positive electrode of the diode VD3 on the other side. The negative electrode of VD3 is also connected to the node C S3 , and the node C S3 is connected to the primary start signal terminal of the second water pump of the signal transmitter through the interface C X3 . The node C S13 is connected to the positive electrode of the diode VD8 through the normally open switch K 4-3 , and the negative electrode of the VD8 is connected to the node C S4 ; The interface C K5 is connected to the automatic operation signal terminal of the fourth water pump of the control system on one side, and to the positive electrode of the diode VD4 on the other side. The negative electrode of the VD4 is also connected to the node C S4 , and the node C S4 is connected to the primary start signal terminal of the fourth water pump of the signal transmitter through the interface C X4 . The first / third water pump mode changeover switch is a rotary switch, controlling switches K 1-1 , K 1-2 , K 1-3 , K 3-1 , K 3-2 , K 3-3 , where the normally-closed switches K 1-1 , K 1-2 are interlocked with the normally-open switch K 1-3 , and the open / closed states of K 1-1 , K 1-2 are always opposite to those of K 1-3 ; the normally-closed switches K 3-1 , K 3-2 are interlocked with the normally-open switch K 3-3 , and the open / closed states of K 3-1 , K 3-2 are always opposite to those of K 3-3 . The second / fourth water pump mode changeover switch is a rotary switch, controlling switches K 2-1 、K 2-2 、K 2-3 、K 4-1 、K 4-2 、K 4-3 ,wherein, normally-closed switches K 2-1 、K 2-2 and normally-open switch K 2-3 are interlocked, and the on / off states of K 2-1 、K 2-2 are always opposite to those of K 2-3 ; normally-closed switches K 4-1 、K 4-2 and normally-open switch K 4-3 are interlocked, and the on / off states of K 4-1 、K 4-2 are always opposite to those of K 4-3 ; The interface C D1 One side is connected to the external power supply DC 24V+, and the other side is connected to the node C S5 Divided into two paths, one path is connected to the node C S8 , and the other path is connected to the device-side DC 24V+ power supply interface through the interface C J1 ; The interface C D2 One side is connected to the external power supply DC 24V-, and the other side is divided into two paths through node C S6 One path is connected to the interface C X9 Through the interface C X9 Connect to the negative pole of the primary signal of the signal transmitter, and 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 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 second start signal terminal of the first water pump of the signal transmitter on one side, and on the other side, it is connected to the first water pump start signal terminal of the equipment end through the interface C J3 ; The interface C X6 is connected to the third water pump secondary start signal terminal of the signal transmitter on one side, and is connected to the third water pump start signal terminal of the equipment end through the interface C J4 on the other side; The interface C X7 is connected to the second start signal terminal of the signal transmitter of the second water pump on one side, and is connected to the second start signal terminal of the equipment side water pump through the interface C J5 on the other side; The interface C X8 is connected to the secondary start signal terminal of the fourth water pump of the signal transmitter on one side, and is connected to the start signal terminal of the fourth water pump of the equipment end through the interface C J6 on the other side.

2. The water pump control switching module according to claim 1, characterized in that: The first / third water pump mode switch includes three gears: when in the middle position, K 1-1 , K 1-2 , K 3-1 , K 3-2 are closed, and K 1-3 , K 3-3 are open; when the knob is rotated counterclockwise, K 1-1 , K 1-2 , K 3-3 are open, and K 3-1 , K 3-2 , K 1-3 are closed; when the knob is rotated clockwise, K 1-1 , K 1-2 , K 3-3 are closed, and K 3-1 , K 3-2 , K 1-3 are open.

3. The water pump control switching module according to claim 1, wherein: The second / fourth water pump mode switch includes three gears: when in the middle position, K 2-1 , K 2-2 , K 4-1 , K 4-2 are closed, and K 2-3 , K 4-3 are open; when the knob is rotated counterclockwise, K 2-1 , K 2-2 , K 4-3 are open, and K 4-1 , K 4-2 , K 2-3 are closed; when the knob is rotated clockwise, K 2-1 , K 2-2 , K 4-3 are closed, and K 4-1 , K 4-2 , K 2-3 are open.

4. A water pump control switching module according to claim 1, characterized in that: The switch K 1-1 , K 1-2 and K 3-1 , K 3-2 are used to enable the first and third water pumps to enter or exit the automatic control mode: when all the switches are closed, the first and third water pumps enter the automatic control mode, and when any group is disconnected, the first and third water pumps simultaneously exit the automatic control mode and enter the manual control mode; The switch K 2-1 , K 2-2 and K 4-1 , K 4-2 are used to enable the second and fourth water pumps to enter or exit the automatic control mode: when all the switches are closed, the second and fourth water pumps enter the automatic control mode, and when any one group is disconnected, the second and fourth water pumps simultaneously exit the automatic control mode and enter the manual control mode; The switch K 1-3 , K 2-3 , K 3-3 , K 4-3 respectively correspond to the manual operation instructions of the first to fourth water pumps. When the switch is closed, the corresponding water pump is manually started.

5. A water pump control switching module according to claim 1, characterized in that: The control system includes a DDC controller.

6. The water pump control switching module according to claim 1, wherein: Four contactors are provided at the device terminal, which are used to receive the water pump start signal and drive the contactor to suck by using the start signal to realize the power supply of the frequency converter to the water pump.

Images