Control system for the ventilation of a cold store

Abstract

The application discloses a low-temperature warehouse ventilation control system, comprising an upper end machine, a control end, an execution end, a ventilation and heat preservation window execution mechanism and a ventilation fan. The application can realize the operation function and signal feedback of original multiple cables through only one cable, can adapt to most different implementation devices on the market, integrates multiple systems through one cable, can greatly save the wiring cost of constructors, reduces the failure rate of the whole system in the use process, and is low in cost due to the adoption of standard components.

Description

TECHNICAL FIELD

[0001] The present application relates to a low-temperature warehouse ventilation control system. BACKGROUND

[0002] At present, the low-temperature warehouse ventilation system is generally composed of a ventilation and heat preservation window and a ventilation fan. If the control cabinet needs to control the ventilation and heat preservation window and the ventilation fan, it must lead two or more cables to the ventilation and heat preservation window and the ventilation fan. The installation position of the ventilation fan often includes the ventilation and heat preservation window. The window needs to be opened and closed by the corresponding actuator. The existing solution basically controls the equipment separately by deploying two or more cables to the ventilation and heat preservation window actuator and the ventilation fan. This is a waste of wire and the linkage effect is not good.

[0003] At present, the ventilation and heat preservation window actuator (window opener) has two execution voltages, which are 220V AC and 24V DC, and the execution positive rotation (window opening) and reverse rotation (window closing) functions are changed by line sequence. The execution mechanism signal feedback voltage is DC 12V or 24V, which is judged by the connection and disconnection. The working voltage of the ventilation fan is AC 380V, which is started by the power supply. The control cabinet provides the corresponding power supply and output.

[0004] Work flow:

[0005] The control cabinet presses the "window opening" button → outputs the window opening voltage (24V DC or 220V AC) → the ventilation and heat preservation window actuator motor is powered on and works → the ventilation and heat preservation window actuator opens to the maximum stroke and triggers the limit switch (closes the signal feedback terminal, connects the feedback common terminal and the opening feedback terminal of the control cabinet) → the control cabinet automatically disconnects the ventilation and heat preservation window actuator motor power supply (closes the ventilation fan start power supply circuit) → completes the window opening action.

[0006] The control cabinet presses the "ventilation" button → outputs the ventilation fan voltage (380V AC) → the ventilation fan is powered on and executes the work;

[0007] The control cabinet presses the "stop" button → disconnects the output ventilation fan voltage (the control cabinet automatically closes the window closing switch circuit).

[0008] The control cabinet presses the "window closing" button → reverses the output window opening voltage (24V DC or 220V AC) → the ventilation and heat preservation window actuator motor is powered on and works → the ventilation and heat preservation window actuator closes to the limit switch (closes the signal feedback terminal, connects the feedback common terminal and the closing feedback terminal of the control cabinet) → completes the window closing action.

[0009] This work flow involves two different systems, and the voltage difference is large, so the cable cannot be directly shared. SUMMARY

[0010] To address the shortcomings of the existing technology, the purpose of this invention is to provide a low-temperature warehouse ventilation control system. This invention introduces control signals to the control terminal via an upper unit (control cabinet), which is then connected to the execution terminal via cables. The relevant functions are then separated and connected to the ventilation fan and the ventilation and insulation window actuators respectively.

[0011] The specific technical solution adopted in this invention is as follows:

[0012] A low-temperature warehouse ventilation control system includes an upper unit, a control unit, an execution unit, a ventilation and insulation window execution mechanism, and a ventilation fan. The upper unit includes a ventilation window control switch and a ventilation fan control switch. The ventilation window control switch includes a common power terminal, a power window opening terminal, a power window closing terminal, a common feedback terminal, an open-position feedback terminal, and a closed-position feedback terminal. The ventilation fan control switch has three live wires L1, L2, and L3 and one ground wire PE. The control unit includes a ventilation window access terminal, a ventilation fan access terminal, a logic control circuit, and an output terminal. The ventilation window access terminal includes U, V, W, X, Y, and Z terminals, which are electrically connected to the common power terminal, the power window opening terminal, the power window closing terminal, the common feedback terminal, the open-position feedback terminal, and the closed-position feedback terminal, respectively. The ventilation fan access terminal includes K, L, M, and N terminals, which are electrically connected to L1, L2, L3, and PE of the ventilation fan control switch, respectively. The output terminal includes four output terminals, specifically... The system comprises G, H, I, and J terminals; U, V, W, X, Y, and Z terminals of the ventilation window access terminal are electrically connected to the logic control circuit for voltage transformation and logic processing, resulting in a three-core output that is electrically connected to H, I, and J terminals; K, L, M, and N terminals of the ventilation fan access terminal are sequentially electrically connected to G, H, I, and J terminals of the control terminal; the execution terminal includes an access terminal, a ventilation window connection terminal, and a ventilation fan connection terminal. The access terminal includes G, H, I, and J terminals, which are sequentially connected to G, H, I, and J terminals of the control terminal; the ventilation window connection terminal includes X, Y, and Z terminals, which are connected to the ventilation and heat preservation window actuator and its limit switch; the ventilation fan connection terminal includes K, L, M, and N terminals, which are connected to the ventilation fan wiring terminal; the execution terminal is also equipped with a relay conversion box. When the access terminal receives voltage from the control terminal, it transmits current to the ventilation window connection terminal and / or the ventilation fan connection terminal through the relay conversion box.

[0013] Furthermore, when the upstream unit executes the "open window" command, the signal is input to the control terminal through the X and Z terminals, and the V and U terminals are monitored to see if they are closed. Once the U and V terminals are closed, the output of the X and Z terminals will be automatically disconnected immediately. The control terminal receives the voltage from the X and Z terminals, transforms and adjusts it, and outputs 24V DC. This output is then sent to the I and J terminals through the logic circuit, with the I terminal outputting a DC "+" terminal and the J terminal outputting a DC "-" terminal. The G terminal is the feedback receiving terminal. After the "open window" action is completed, the J terminal of the control terminal receives a 24V voltage and feeds it back to the logic control circuit of the control terminal. The logic control circuit judges and closes the U and V terminals, so that the upstream unit receives the "open in place" signal feedback.

[0014] Furthermore, according to claim 1, the low-temperature warehouse ventilation control system is characterized in that when the upper unit executes the "close window" command, the signal is input to the control terminal through the Y and Z terminals, and the W and U terminals are monitored to see if they are in a closed state. Once the U and V terminals are closed, the output of the Y and Z terminals will be automatically disconnected immediately. The control terminal will receive the voltage from the Y and Z terminals, perform voltage transformation and adjustment, and output it to the logic circuit on the J and I terminals. The I terminal outputs a DC "-" terminal, the J terminal outputs a DC "+" terminal, and the G terminal is the feedback receiving terminal. After the "close window" action is completed at the front end, the J terminal of the control terminal will receive a 24V voltage and feed it back to the logic control circuit of the control terminal. The logic control circuit will judge and close the U and W terminals, so that the upper unit receives the "closed in place" signal feedback.

[0015] Furthermore, when the upper unit executes the "ventilation" command, the operating current of the control terminal will be input from the K(L1), L(L2), M(L3), and N(PE) terminals, and output from the G(L1), H(L2), I(L3), and J(PE) terminals.

[0016] Furthermore, when the J, I, and H terminals of the actuator receive the voltage sent from the control terminal (I is "+", J is "-", and G), the current is output to the Y and X terminals (Y is "+" and X is "-") through the protection of the intermediate relay conversion box, driving the motor of the ventilation and heat preservation window actuator to perform the window opening operation; after the front end "opening" action is completed, the Z terminal of the control terminal will receive a 24V voltage and feed it back to the G terminal of the actuator through the circuit, so that the control terminal can obtain the "open in place" signal feedback through the cable.

[0017] Furthermore, when the J, I, and H terminals of the actuator receive the voltage from the control terminal (I is "+", J is "-", and G), the current is output to the Y and X terminals (Y is "-" and X is "+") through the protection of the intermediate relay conversion box, driving the motor of the ventilation and heat preservation window actuator to perform the window opening operation; after the front end "opens the window" action is completed, the Z terminal of the control terminal will receive a 24V voltage and feed it back to the G terminal of the actuator through the circuit, so that the control terminal can obtain the "closed" signal feedback through the cable.

[0018] Furthermore, when the J, I, H, and G terminals of the actuator receive a 380V voltage from the control terminal (I is "L1", J is "L2", H is "L3", and G is "PE"), the H and J terminals, and the J and I terminals, will activate the corresponding intermediate relays, causing the X, Y, and Z terminals of the actuator to be protected against circuit breaks. The operating current will be output to the fan from the K (L1), L (L2), M (L3), and N (PE) terminals.

[0019] Furthermore, when the 380V operating voltage from the J, I, H, and G terminals of the control terminal is disconnected, the circuit in the execution terminal will automatically reconnect the circuits at the X, Y, and Z terminals.

[0020] The beneficial effects of this invention are as follows: This invention integrates operational functions and signal feedback that previously required multiple cables into a single cable using only two boxes (control unit and execution unit). It is adaptable to the vast majority of different implementation devices on the market. By integrating multiple systems into a single cable, this invention significantly reduces wiring costs for builders. It also lowers the failure rate of the entire system during later use. Furthermore, the use of standard components in the assembly process results in low cost. Attached Figure Description

[0021] Fig. 1 This is a schematic diagram of the overall connection structure of the low-temperature warehouse ventilation control system in an embodiment of the present invention;

[0022] Fig. 2 This is a schematic diagram of the control terminal in an embodiment of the present invention;

[0023] Fig. 3 A schematic diagram of the off-center execution terminal of this invention. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] likeFigs. 1-3 As shown, this embodiment provides a low-temperature warehouse ventilation control system, including an upper unit, a control unit, an execution unit, a ventilation and insulation window execution mechanism, and a ventilation fan. The upper unit includes a ventilation window control switch and a ventilation fan control switch. The ventilation window control switch includes a common power terminal, a power window opening terminal, a power window closing terminal, a common feedback terminal, an open position feedback terminal, and a closed position feedback terminal. The ventilation fan control switch is equipped with three live wires L1, L2, and L3 (in order as follows). Figs. 1-3 The control terminal includes a U, V, W, X, Y, and Z terminal, which are electrically connected to the common power supply terminal, the power supply window opening terminal, the power supply window closing terminal, the common feedback terminal, the open position feedback, and the close position feedback, respectively. The ventilation fan connection terminal includes K, L, M, and N terminals, which are electrically connected to the L1, L2, L3, and PE terminals of the ventilation fan control switch, respectively. The output terminal includes four output terminals, specifically G, H, I, and J terminals. The U, V, W, X, Y, and Z terminals of the ventilation window connection terminal are electrically connected to the logic control circuit for voltage transformation and logic processing, converting it into a three-core output and electrically connecting it. The ventilation fan input terminal is connected to terminals H, I, and J; terminals K, L, M, and N of the ventilation fan input terminal are electrically connected to terminals G, H, I, and J of the control terminal, respectively; the execution terminal includes an input terminal, a ventilation window connection terminal, and a ventilation fan connection terminal. The input terminal includes terminals G, H, I, and J, which are connected to terminals G, H, I, and J of the control terminal, respectively; the ventilation window connection terminal includes terminals X, Y, and Z, which are connected to the ventilation and heat preservation window actuator and the ventilation and heat preservation window actuator limiter; the ventilation fan connection terminal includes terminals K, L, M, and N, which are connected to the ventilation fan wiring terminal; the execution terminal is also equipped with a relay conversion box. When the input terminal receives voltage from the control terminal, it transmits current to the ventilation window connection terminal and / or the ventilation fan connection terminal through the relay conversion box.

[0026] Among them, the working principle of the control end ( Fig. 2 ):

[0027] The functions and outputs of terminals G, H, I, and J in the diagram differ at different working stages. This example environment uses a 24V DC motor for the ventilation and insulation window actuator (window opener); the ventilation fan operates at 380V AC; and the upper unit (control cabinet) outputs a 220V AC voltage for the ventilation and insulation window actuator (window opener) (i.e., the output terminal and common terminal are both 220V).

[0028] The control terminal connects to the six wires of the ventilation and heat preservation window actuator led out from the upper unit (control cabinet) (namely: common power supply terminal (Z), window opening terminal (Y), window closing terminal (X), common feedback terminal (U), open position feedback (V), and close position feedback (W)) for voltage transformation and logic processing. The three-core output is connected to the output terminals (H, I, J) of the control terminal.

[0029] The control terminal connects the four wires of the ventilation fan led out from the upper unit (control cabinet) to the control terminal (these are: three live wires and one ground wire, shown in the figure as: K (L1), L (L2), M (L3), N (PE) terminals).

[0030] Window opening action execution status:

[0031] When the upper-level unit (control cabinet) executes the "open window" command, the signal is input to the control terminal through the X and Z terminals, and the V and U terminals are monitored to see if they are closed. Once the U and V terminals are closed, the output of the X and Z terminals will be automatically disconnected immediately. The control terminal receives the voltage from the X and Z terminals, transforms and adjusts it, and outputs 24V DC. This output is then passed through logic circuitry to the I and J terminals, with the I terminal output as the DC "+" terminal and the J terminal output as the DC "-" terminal. The G terminal is the feedback receiving terminal.

[0032] After the "window opening" action at the front end is completed, the J terminal of the control terminal will receive a 24V voltage and feed it back to the logic control circuit of the control terminal. The logic control circuit will then make a judgment and close the U and V terminals, so that the upper-end machine (control cabinet) receives the "open in place" signal feedback.

[0033] Window closing action execution status:

[0034] When the upper-level unit (control cabinet) executes the "close window" command, the signal is input to the control terminal through the Y and Z terminals, and the W and U terminals are monitored to see if they are closed. Once the U and V terminals are closed, the output of the Y and Z terminals will be automatically disconnected immediately. The control terminal receives the voltage from the Y and Z terminals, transforms and adjusts it, and outputs it to the logic circuit on the J and I terminals. The I terminal outputs as the DC "-" terminal, the J terminal outputs as the DC "+" terminal, and the G terminal is the feedback receiving terminal.

[0035] After the "close window" action is completed at the front end, the J terminal of the control terminal will receive a 24V voltage and feed it back to the logic control circuit of the control terminal. The logic control circuit will then make a judgment and close the U and W terminals, so that the upper-end machine (control cabinet) receives the "closed in place" signal feedback.

[0036] Ventilation operation status of the fan:

[0037] When the upper unit (control cabinet) executes the "ventilation" command, the operating current will be input from the K(L1), L(L2), M(L3), and N(PE) terminals and output from the G(L1), H(L2), I(L3), and J(PE) terminals.

[0038] How the execution end works: Fig. 3 )

[0039] The actuator terminals G, H, I, and J are connected to the control terminals G, H, I, and J respectively (using one cable). The X, Y, and Z terminals are connected to the ventilation and insulation window actuator and its limit switch. The L, M, N, and K terminals are connected to the ventilation fan terminals.

[0040] Window opening action execution status:

[0041] When the J, I, and H terminals of the actuator receive the voltage sent from the control terminal (I is "+", J is "-", and G is "-"), the current is output to the Y and X terminals (Y is "+" and X is "-") through the protection of the intermediate relay conversion box, thereby driving the motor of the ventilation and heat preservation window actuator to perform the window opening operation.

[0042] After the "window opening" action at the front end is completed, the Z terminal of the control terminal will receive a 24V voltage and feed it back to the G terminal of the execution terminal through the circuit. The control terminal will then receive a "window opening complete" signal feedback through the cable.

[0043] Window closing action execution status:

[0044] When the J, I, and H terminals of the actuator receive the voltage sent from the control terminal (I is "+", J is "-", and G is "-"), the current is output to the Y and X terminals (Y is "-" and X is "+") through the protection of the intermediate relay conversion box, thereby driving the motor of the ventilation and heat preservation window actuator to perform the window opening operation.

[0045] After the "open window" action at the front end is completed, the Z terminal of the control terminal will receive a 24V voltage and feed it back to the G terminal of the execution terminal through the circuit. The control terminal will then receive a "closed" signal feedback through the cable.

[0046] Ventilation operation status of the fan:

[0047] When the J, I, H, and G terminals of the actuator receive a 380V voltage from the control terminal (I is "L1", J is "L2", H is "L3", and G is "PE"), the intermediate relays at H and J terminals, and J and I terminals, will activate, causing the circuits at the X, Y, and Z terminals of the actuator to be open-circuited. The operating current will be output to the fan from the K (L1), L (L2), M (L3), and N (PE) terminals.

[0048] Work protection:

[0049] When the 380V operating voltage from the J, I, H, and G terminals of the control terminal is disconnected, the circuit in the execution terminal will automatically reconnect the circuits at the X, Y, and Z terminals.

[0050] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A ventilation control system for a low-temperature warehouse, characterized in that, The system includes an upper unit, a control unit, an actuator, a ventilation and insulation window actuator, and a ventilation fan. The upper unit includes a ventilation window control switch and a ventilation fan control switch. The ventilation window control switch includes a common power terminal, a power window opening terminal, a power window closing terminal, a common feedback terminal, an open position feedback terminal, and a closed position feedback terminal. The ventilation fan control switch has three live wires L1, L2, and L3 and one ground wire PE. The control unit includes a ventilation window input terminal, a ventilation fan input terminal, a logic control circuit, and an output terminal. The ventilation window input terminal includes U, V, W, X, Y, and Z terminals. The components are sequentially connected to the power common terminal, power window opening terminal, power window closing terminal, common feedback terminal, open-position feedback, and closed-position feedback, respectively. The ventilation fan input terminal includes K, L, M, and N terminals, which are sequentially connected to the ventilation fan control switch L1, L2, L3, and PE, respectively. The output terminal includes four output terminals, specifically G, H, I, and J terminals. The ventilation window input terminal's U, V, W, X, Y, and Z terminals are electrically connected to the logic control circuit for voltage transformation and logic processing, converting it into a three-core output and electrically connecting it to the H, I, and J terminals. The K, L, M, and N terminals of the ventilation fan input terminal are electrically connected to the G, H, I, and J terminals of the control terminal, respectively. The execution terminal includes an input terminal, a ventilation window connection terminal, and a ventilation fan connection terminal. The input terminal includes G, H, I, and J terminals, which are connected to the G, H, I, and J terminals of the control terminal, respectively. The ventilation window connection terminal includes X, Y, and Z terminals, which are connected to the ventilation and insulation window actuator and the ventilation and insulation window actuator limiter. The ventilation fan connection terminal includes K, L, M, and N terminals, which are connected to the ventilation fan wiring terminal. The execution terminal... It is also equipped with a relay conversion box. When the input end receives the voltage sent by the control end, the current is transmitted to the ventilation window connection end or the ventilation fan connection end through the relay conversion box. When the upper unit executes the "ventilation" command, the operating current of the control end will be input from the K, L, M, N terminals and output from the G, H, I, J terminals. When the J, I, H, G terminals of the execution end receive the 380V voltage sent by the control end, the H and J terminals and the J and I terminals will activate the corresponding intermediate relays, so that the circuit of the X, Y, Z terminals of the execution end is protected by circuit breaking, and the operating current will be output from the K, L, M, N terminals to the fan. When the 380V operating voltage from the J, I, H, and G terminals of the control terminal is disconnected, the circuit in the execution terminal will automatically reconnect the circuits at the X, Y, and Z terminals.

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