Control device of electric valve of heat supply system

Abstract

The utility model relates to a control device of an electric valve of a heat supply system. The control device is characterized by comprising a first current acquisition module, a second current acquisition module, a first comparator, a second comparator, a first timer, a second timer, a first AND gate, a second AND gate, a first switch and a second switch. By using the device, the opening degree control current is given, and the opening degree control current is converted into switching quantity output, so that the control on the opening degree of the valve is realized, the valve not only has two limit states of'opening 'and'closing', but also can have different opening degrees, and the regulation on the air supply flow can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of centralized heating, in particular to a control device for an electric valve of a heating system. Background Art

[0002] A large number of on-off electric valves are used in central heating applications. They are mainly used to control the on-off of gate valves, stop valves, etc., so as to manage the steam supply and stop of steam users.

[0003] With the promotion of centralized heating projects, more and more companies use centralized heating to obtain heat energy, which often leads to unbalanced load of heating pipe network and insufficient steam supply capacity. Many users cannot stop steam supply after the equipment is put into operation, otherwise waste or other safety accidents will occur. Therefore, when the heating capacity is insufficient, it is not possible to completely cut off steam for all steam users, but different valve opening control must be implemented for different steam users to ensure the safe operation of the heating network.

[0004] At present, most heating pipelines use on-off type electric valves, which only accept on-off control signals and cannot directly accept opening control. As a result, the valve has only two states: "open" and "closed", and the valve opening cannot be adjusted. Utility Model Content

[0005] Based on the above description, the utility model provides a control device for an electric valve of a heating system, which can adjust the opening of the electric valve.

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] A control device for an electric valve of a heating system, comprising a first current acquisition module, a second current acquisition module, a first comparator, a second comparator, a first timer, a second timer, a first AND gate and a second AND gate, a first switch and a second switch; the input end of the first current acquisition module is connected to the signal output end of the controller of the electric actuator, the output end of the first current acquisition module is connected to the positive input end of the first comparator, and the output end of the first comparator is connected to the first input end of the first AND gate; the input end of the second current acquisition module is connected to the output end of a valve position opening sensor of the valve, the output end of the second current acquisition module is connected to the positive input end of the second comparator, and the output end of the second comparator is connected to the first input end of the second AND gate ; The output end of the first current acquisition module is also connected to the reverse input end of the second comparator; the output end of the second current acquisition module is also connected to the reverse input end of the first comparator; the trigger end of the first timer is connected to the output end of the first comparator, and the output end of the first timer is connected to the second input end of the first AND gate; the trigger end of the second timer is connected to the output end of the second comparator, and the output end of the second timer is connected to the second input end of the second AND gate; the output end of the first AND gate is connected to the control end of the first switch, and the first switch is used to control the electric actuator to perform the "open" valve action; the output end of the second AND gate is connected to the control end of the second switch, and the second switch is used to control the electric actuator to perform the "close" valve action.

[0008] As a preferred solution: it also includes a key module, the output end of the key module is connected to the third input end of the first AND gate, and the output end of the key module is connected to the third input end of the second AND gate, and the output end of the key module can be switched between high level and low level by pressing the key module.

[0009] As a preferred solution: the first timer is a rising edge timer.

[0010] As a preferred solution: the second timer is a rising edge timer.

[0011] As a preferred solution: the first switch is a relay or a contactor.

[0012] As a preferred solution: the second switch is a relay or a contactor.

[0013] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0014] By using this device, the opening control current is given and converted into a switch output, thereby realizing the control of the valve opening size, so that the valve not only has two extreme states of "open" and "closed", but also has different openings, which can realize the regulation of the gas supply flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 4 is a circuit schematic diagram of the control device in this embodiment. DETAILED DESCRIPTION

[0016] Reference Figure 1 , an opening control device for an electric valve of a heating system, comprising a first current acquisition module 1, a second current acquisition module 2, a first comparator 3, a second comparator 4, a first timer 5, a second timer 6, a first AND gate 8 and a second AND gate 9, a first switch 10 and a second switch 11.

[0017] The input end of the first current acquisition module 1 is connected to the signal output end of the controller of the electric actuator, the output end of the first current acquisition module 1 is connected to the positive input end of the first comparator 3, and the output end of the first comparator 3 is connected to the first input end of the first AND gate 8. The first current acquisition module 1 is used to collect the opening control current given by the controller of the electric actuator, and output the collected opening control current value to the first comparator 3.

[0018] The input end of the second current acquisition module 2 is connected to the output end of the valve position opening sensor of the valve, the output end of the second current acquisition module 2 is connected to the positive input end of the second comparator 4, and the output end of the second comparator 4 is connected to the first input end of the second AND gate 9. The second current acquisition module 2 is used to collect the opening feedback current value output by the valve position opening sensor, and output the collected opening feedback current value to the second comparator 4.

[0019] The output end of the first current acquisition module 1 is also connected to the inverting input end of the second comparator 4 ; the output end of the second current acquisition module 2 is also connected to the inverting input end of the first comparator 3 .

[0020] The trigger end of the first timer 5 is connected to the output end of the first comparator 3, and the output end of the first timer 5 is connected to the second input end of the first AND gate 8; the trigger end of the second timer 6 is connected to the output end of the second comparator 4, and the output end of the second timer 6 is connected to the second input end of the second AND gate 9.

[0021] The output end of the first AND gate 8 is connected to the control end of the first switch 10, and the first switch 10 is used to control the electric actuator to perform the "open" valve action. The output end of the second AND gate 9 is connected to the control end of the second switch 11, and the second switch 11 is used to control the electric actuator to perform the "close" valve action.

[0022] The working principle of the device is:

[0023] The first current acquisition module 1 acquires the opening control current signal given by the controller of the electric actuator, and the opening control current signal is input to the positive input end of the first comparator 3 and the reverse input end of the second comparator 4; the second current acquisition module 2 acquires the opening feedback current signal output by the valve opening sensor, and the opening feedback current signal is input to the reverse input end of the first comparator 3 and the positive input end of the second comparator 4.

[0024] The first comparator 3 and the second comparator 4 respectively compare the opening control current signal with the opening feedback current signal. When the opening control current value is greater than the opening feedback current value, the first comparator 3 outputs a high level signal and the second comparator 4 outputs a low level signal. At this time, the first timer 5 is triggered, and the first timer 5 starts to output a high level signal and starts timing.

[0025] In this state, the first comparator 3 and the first timer 5 both output high-level signals, the first AND gate 8 outputs a high-level signal to the first switch 10, and the first switch 10 changes from an off state to an on state. At this time, the electric actuator begins to perform the "open" valve action, and the opening feedback current continues to increase during the valve opening process. When the opening feedback current is equal to the opening control current, the first comparator 3 outputs a low-level signal, and at this time, the first timer 5 is reset and outputs a level signal, the first AND gate 8 outputs a low-level signal, the first switch 10 changes from an on state to an off state, the electric actuator stops running, and the valve stops at the current opening.

[0026] When the opening control current value given by the controller is less than the opening feedback current value, the first comparator 3 outputs a low level signal and the second comparator 4 outputs a high level signal. At this time, the second timer 6 is triggered, and the second timer 6 starts to output a high level signal and start timing.

[0027] In this state, the second comparator 4 and the second timer 6 both output high-level signals, the second AND gate 9 outputs a high-level signal to the second switch 11, and the second switch 11 changes from an off state to an on state. At this time, the electric actuator begins to perform the "closing" valve action, and the opening feedback current continues to decrease during the valve closing process. When the opening feedback current is equal to the opening control current, the second comparator 4 outputs a low-level signal, and the second timer 6 is reset and outputs a level signal. The second AND gate 9 outputs a low-level signal, and the second switch 11 changes from an on state to an off state. The electric actuator stops running, and the valve stops at the current opening.

[0028] By using this device, the valve opening can be controlled by adjusting the size of the given opening control current of the controller of the electric actuator, so that the valve not only has two extreme states of "open" and "closed", but also has different openings, so that the gas supply flow can be adjusted.

[0029] It should be noted that the time constants of the first timer 5 and the second timer 6 in this embodiment are determined by the control opening and the valve travel time. When the valve opening feedback current conversion time is long, the timer can be used to assist in resetting the switch value instruction.

[0030] The control device in this embodiment further includes a key module 7, the output end of the key module 7 is connected to the third input end of the first AND gate 8, and the output end of the key module 7 is connected to the third input end of the second AND gate 9. By pressing the key module 7, its output end can be switched between a high level and a low level.

[0031] In this embodiment, the first timer 5 and the second timer 6 are both rising edge timers.

[0032] In this embodiment, the first switch 10 and the second switch 11 are relays or contactors.

[0033] When the device is not needed, the button module 7 is pressed to make it output a low-level signal. At this time, both the first AND gate 8 and the second AND gate 9 output low-level signals, and the valve opening adjustment function is disabled.

[0034] When the device needs to be used, the button module 7 is pressed to make it output a high-level signal, and the valve opening adjustment function is enabled.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A control device for an electric valve of a heating system, characterized in that: It includes a first current acquisition module, a second current acquisition module, a first comparator, a second comparator, a first timer, a second timer, a first AND gate and a second AND gate, a first switch and a second switch; the input end of the first current acquisition module is connected to the signal output end of the controller of the electric actuator, the output end of the first current acquisition module is connected to the positive input end of the first comparator, and the output end of the first comparator is connected to the first input end of the first AND gate; The input end of the second current acquisition module is connected to the output end of the valve position opening sensor of the valve, the output end of the second current acquisition module is connected to the positive input end of the second comparator, and the output end of the second comparator is connected to the first input end of the second AND gate; the output end of the first current acquisition module is also connected to the negative input end of the second comparator; The output end of the second current acquisition module is also connected to the reverse input end of the first comparator; the trigger end of the first timer is connected to the output end of the first comparator, and the output end of the first timer is connected to the second input end of the first AND gate; the trigger end of the second timer is connected to the output end of the second comparator, and the output end of the second timer is connected to the second input end of the second AND gate; the output end of the first AND gate is connected to the control end of the first switch, and the first switch is used to control the electric actuator to perform the "open" valve action; the output end of the second AND gate is connected to the control end of the second switch, and the second switch is used to control the electric actuator to perform the "close" valve action.

2. The control device for the electric valve of the heating system according to claim 1 is characterized in that: It also includes a key module, the output end of the key module is connected to the third input end of the first AND gate, and the output end of the key module is connected to the third input end of the second AND gate. By pressing the key module, its output end can be switched between a high level and a low level.

3. The control device for the electric valve of the heating system according to claim 1 is characterized in that: The first timer is a rising edge timer.

4. The control device for the electric valve of the heating system according to claim 1 is characterized in that: The second timer is a rising edge timer.

5. The control device for the electric valve of the heating system according to claim 1, characterized in that: The first switch is a relay or a contactor.

6. The control device for the electric valve of the heating system according to claim 1, characterized in that: The second switch is a relay or a contactor.

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