CN218955236U

CN218955236U - Device for directly driving electronic expansion valve by PLC

Info

Publication number: CN218955236U
Application number: CN202223540068.8U
Authority: CN
Inventors: 胡祥江
Original assignee: Tofflon Science and Technology Group Co Ltd
Current assignee: Tofflon Science and Technology Group Co Ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-05-02
Anticipated expiration: 2032-12-29

Abstract

The utility model relates to the field of electronic expansion valves, and particularly discloses a device for directly driving an electronic expansion valve by using a PLC (programmable logic controller), which comprises an electronic expansion valve body, wherein an electronic expansion valve coil is arranged above the electronic expansion valve body, one side of the electronic expansion valve coil is provided with a plurality of paths of solid relays, one end of each path of solid relay is connected with a PLC, a connecting wire group is arranged between each path of solid relay and the electronic expansion valve coil, and the connecting wire group comprises: an A phase positive electrode lead, an A phase negative electrode lead, a B phase positive electrode lead and a B phase negative electrode lead. The PLC is directly driven by the electronic expansion valve, so that the dependence on the driving of the special electronic expansion valve is eliminated, and the scheme not only enhances the universality of the control of the electronic expansion valve, but also reduces the cost of equipment.

Description

Device for directly driving electronic expansion valve by PLC

Technical Field

The utility model relates to the field of electronic expansion valves, in particular to a device for directly driving an electronic expansion valve by a Programmable Logic Controller (PLC).

Background

The electronic expansion valve is widely used in various refrigeration systems because of the advantages of large control range, sensitive response, rapid action, fine adjustment and the like, the electronic expansion valve of a stepping motor is commonly used in the field of freeze-drying machines and comprises a stepping motor and a valve body, the opening of the valve body is controlled through the rotation of the stepping motor, the stepping electronic expansion valve is driven by a special driver to be connected with the stepping motor, and when the electronic expansion valve is required to be driven, the controller sends pulse control signals to the driver so as to drive the stepping motor to rotate.

However, since the stepper electronic expansion valve driver is bulky, the installation requirements cannot be met for some miniaturized products.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model provides a device for directly driving an electronic expansion valve by using a PLC, which solves the problems in the background.

The utility model provides the following technical scheme: the utility model provides a device of PLC direct drive electronic expansion valve, includes the electronic expansion valve body, the electronic expansion valve coil is installed to the top of electronic expansion valve body, one side of electronic expansion valve coil is provided with multichannel solid-state relay, the one end of multichannel solid-state relay is connected with the PLC controller, multichannel solid-state relay with install the connecting wire group between the electronic expansion valve coil, the connecting wire group includes: an A phase positive electrode lead, an A phase negative electrode lead, a B phase positive electrode lead and a B phase negative electrode lead.

As still further aspects of the utility model: and the PLC controller, the multipath solid state relay and the electronic expansion valve coil are all externally connected with a public terminal outgoing line.

As still further aspects of the utility model: and a plurality of groups of input and output ports are formed in the multipath solid state relay.

As still further aspects of the utility model: and the PLC is externally connected with a 24V direct current power supply negative electrode through the public end outgoing line.

As still further aspects of the utility model: the output ends of the multi-path solid state relay are externally connected with a 24V direct current power supply negative electrode through the public end outgoing line, and the output ends of the multi-path solid state relay are externally connected with a 12V direct current power supply negative electrode through the public end outgoing line.

As still further aspects of the utility model: and the PLC is electrically connected with the multipath solid state relay.

Compared with the prior art, the utility model has the beneficial effects that:

1. the PLC is directly driven by the electronic expansion valve, so that the dependence on the driving of the special electronic expansion valve is eliminated, and the scheme not only enhances the universality of the control of the electronic expansion valve, but also reduces the cost of equipment.

Drawings

FIG. 1 is a schematic diagram of a device for directly driving an electronic expansion valve by a PLC;

fig. 2 is a schematic diagram of circuit connection in a device in which a PLC directly drives an electronic expansion valve.

In the figure: 1. a PLC controller; 2. a multi-path solid state relay; 3. an electronic expansion valve coil; 4. an electronic expansion valve body; 5. a public end outgoing line; 6. a phase A positive electrode outgoing line; 7. a phase A negative electrode outgoing line; 8. a phase B positive lead wire; 9. and a phase B negative electrode outgoing line.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1-2, this embodiment provides a device for directly driving an electronic expansion valve by using a PLC, which includes an electronic expansion valve body 4, an electronic expansion valve coil 3 is installed above the electronic expansion valve body 4, one side of the electronic expansion valve coil 3 is provided with a plurality of solid state relays 2, one end of the plurality of solid state relays 2 is connected with a PLC controller 1, the PLC controller 1 is electrically connected with the plurality of solid state relays 2, a connection line group is installed between the plurality of solid state relays 2 and the electronic expansion valve coil 3, and the connection line group includes: the lead wires are an A-phase positive lead wire 6, an A-phase negative lead wire 7, a B-phase positive lead wire 8 and a B-phase negative lead wire 9.

As shown in fig. 1-2, the PLC controller 1, the multiple solid state relays 2 and the electronic expansion valve coil 3 are all externally connected with a common terminal lead-out wire 5, the PLC controller 1 is externally connected with a 24V dc power supply negative electrode through the common terminal lead-out wire 5, multiple groups of input and output ports are formed in the multiple solid state relays 2, the output ends of the multiple solid state relays 2 are externally connected with a 24V dc power supply negative electrode through the common terminal lead-out wire 5, and the output ends of the multiple solid state relays 2 are externally connected with a 12V dc power supply negative electrode through the common terminal lead-out wire 5.

The working principle of the utility model is as follows: the electronic expansion valve body 4 can be driven to operate in a two-phase four-beat or two-phase eight-beat mode, and the following driving mode can be realized through a program of the PLC controller 1:

two-phase four-beat forward rotation: a+ & gtB+ & gtA- & gtB- & gtA+;

two-phase four-beat inversion: a+ & gt, B- & gt, A- & gt, B+ & gt, A+ >

two phases of eight beats rotate positively: a+ & gtA+B+ & gtB+ & gtB+A- & gtA-B- & gtB-A+ & gtA+ & gtA.

Two-phase eight-beat inversion: a+ & gtA+B- & gtB-A- & gtA- + → B +. B+ase:Sub>A + → ase:Sub>A +;

the process comprises the following steps:

a+ represents a high level of the phase a positive electrode lead-out wire 6 connected with one pulse period;

b+ represents a high level at which the a-phase negative electrode lead-out line 7 is turned on for one pulse period;

a-represents that the B phase positive lead-out wire 8 is connected with a high level of one pulse period;

b-represents that the negative electrode lead-out wire 9 of the B phase is connected with a high level of one pulse period;

a+b+ represents a high level in which the a-phase positive electrode lead 6 and the a-phase negative electrode lead 7 are simultaneously turned on for one pulse period;

B+A- (or A-B+) represents the high level of the A phase negative electrode outgoing line 7 and the B phase positive electrode outgoing line 8 which are simultaneously connected for one pulse period;

a-B-represents a high level of one pulse period of connection of the B-phase positive electrode lead-out wire 8 and the B-phase negative electrode lead-out wire 9 at the same time;

B-A+ (or A+B-) represents the high level of the B-phase negative electrode lead 9 and the A-phase positive electrode lead 6 being simultaneously turned on for one pulse period.

It is noted that relational terms such as first and second, and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions, and further, that the terms "comprise," "include," or any other variation thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a device of PLC direct drive electronic expansion valve, includes electronic expansion valve body (4), its characterized in that, electronic expansion valve coil (3) are installed to the top of electronic expansion valve body (4), one side of electronic expansion valve coil (3) is provided with multichannel solid state relay (2), the one end of multichannel solid state relay (2) is connected with PLC controller (1), multichannel solid state relay (2) with install the connecting wire group between electronic expansion valve coil (3), the connecting wire group includes: an A-phase positive electrode lead wire (6), an A-phase negative electrode lead wire (7), a B-phase positive electrode lead wire (8) and a B-phase negative electrode lead wire (9).

2. The device for directly driving the electronic expansion valve by the PLC according to claim 1, wherein the PLC controller (1), the multipath solid state relay (2) and the electronic expansion valve coil (3) are externally connected with a public terminal outgoing line (5).

3. The device for directly driving the electronic expansion valve by the PLC according to claim 2, wherein a plurality of groups of input ports and output ports are formed in the multipath solid state relay (2).

4. A device for directly driving an electronic expansion valve by a PLC according to claim 3, wherein the PLC controller (1) is externally connected with a 24V dc power supply negative electrode through the common terminal lead wire (5).

5. A device for directly driving an electronic expansion valve by using a PLC according to claim 3, wherein the output end of the multi-path solid state relay (2) is externally connected with a 24V dc power supply negative electrode through the common terminal lead wire (5), and the output end of the multi-path solid state relay (2) is externally connected with a 12V dc power supply negative electrode through the common terminal lead wire (5).

6. The device for directly driving the electronic expansion valve by using the PLC according to claim 1, wherein the PLC controller (1) is electrically connected with the multipath solid state relay (2).