CN211785840U

CN211785840U - Electronic expansion valve detection device

Info

Publication number: CN211785840U
Application number: CN201922252359.9U
Authority: CN
Inventors: 张凯
Original assignee: Shanghai Fu Filter Enterprise Development Co ltd
Current assignee: Shanghai Fu Filter Enterprise Development Co ltd
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2020-10-27
Anticipated expiration: 2029-12-13

Abstract

The utility model discloses an electronic expansion valve detection device, including the needle, the needle is fixed and is served at regulation pole one, the regulation pole other end passes a detection section of thick bamboo respectively, excessive pressure cover, it is fixed with the assembly of regulation section of thick bamboo to adjust the pole top, adjust the inside hollow regulation inner tube that is of a section of thick bamboo, block in the regulation inner tube, slidable is equipped with the electrically conductive main aspects, electrically conductive main aspects one end is connected with first wire is electrically conductive, be fixed with on the other end and lead electrical pillar, it passes the regulation section of thick bamboo to lead electrical pillar, be connected with the conducting block is electrically conductive behind the regulating spring, electrically conductive connection of conducting pillar one end and second wire, first wire is connected with DC power supply's anodal electrically conductive, the second wire is connected with DC power supply's negative pole is electrically conductive, first wire respectively with the negative pole of voltmeter, anodal electrically. The utility model discloses simple structure, and the mode through forming the slide rheostat between conducting block, the conducting strip converts the needle displacement volume, and its precision is high, with low costs, maintains simply.

Description

Electronic expansion valve detection device

Technical Field

The utility model relates to an expansion valve especially relates to an electronic expansion valve detection device.

Background

The electronic expansion valve controls the voltage or current applied to the expansion valve by using the electric signal generated by the regulated parameter, thereby achieving the purpose of regulating the liquid supply amount. The detection device of the electronic expansion valve is used for detecting the position of the valve needle, so as to calculate the opening degree of the valve hole, which is very important for a precisely controlled refrigeration system. The main way at present is to install a magnet on the valve needle and then detect the position through a hall sensor, which is high in precision but high in cost, and the magnet has a risk of demagnetization, so that the later maintenance cost is high.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defects in the prior art, the technical problem to be solved in the utility model is to provide an electronic expansion valve detection device, its is with low costs, and is high to the detection precision of needle position.

In order to achieve the above purpose, the utility model provides an electronic expansion valve detection device, which is installed in a valve casing, wherein a hollow valve cavity is arranged inside the valve casing, a valve body is installed inside the valve cavity, the valve body is respectively provided with a passageway and a valve hole, the valve hole is communicated with one end of the passageway, the other end of the passageway is communicated with an input pipe, and the input pipe inputs liquid refrigerant; the valve hole is clamped and assembled in a sealing way with one end of the valve needle provided with the needle body, and the valve hole is communicated with the output hole; the needle is fixed and is served at regulation pole one, and the regulation pole other end passes detection section of thick bamboo, excessive pressure cover respectively, it is fixed with a regulation section of thick bamboo assembly to adjust the top, adjusts the inside hollow regulation inner tube that is of a section of thick bamboo, and block, slidable are equipped with electrically conductive main aspects in the regulation inner tube, and electrically conductive main aspects one end is connected with first wire is electrically conductive, is fixed with on the other end and leads electrical pillar, leads electrical pillar and is connected with the conducting block is electrically conductive after passing regulation section of thick bamboo, adjusting spring, conducting pillar one end is connected with second wire is electrically conductive, first wire is connected with DC power supply's anodal electrically conductive, the second wire is connected with DC power supply's negative pole electrically conductive, the anodal electrically conductive connection of second wire, first wire respectively with the negative pole of voltmeter, the signal terminal and.

Preferably, the valve body is provided with an overpressure cover, the interior of the overpressure cover is a hollow inner cover, the inner cover is communicated with the passageway through a communicating groove, the inner cover is internally clamped, sealed and slidably provided with a detection cylinder, and a detection spring is arranged between the top of the detection cylinder and the top of the inner cover;

the overvoltage detection box is characterized in that a detection rod is fixed on the detection cylinder, one end of the detection rod penetrates through the overvoltage cover to enter the overvoltage detection cavity and be fixedly assembled with the trigger plate, the trigger plate is slidably mounted in the overvoltage detection cavity and is just opposite to the trigger end of the overvoltage switch, the overvoltage switch is fixed in the overvoltage detection cavity, and the overvoltage detection cavity is arranged inside the overvoltage detection box.

Preferably, a limiting plate is further fixed near the overvoltage switch and in the overvoltage detection cavity, the limiting plate is used for limiting the maximum displacement of the trigger plate to the overvoltage switch, a signal end of the overvoltage switch is in communication connection with a signal end of the PLC, and the PLC is installed in the electrical box.

Preferably, a locking block and a tooth groove are respectively fixed on one end of the adjusting rod, which penetrates through the overpressure cover, the adjusting rod is respectively assembled with the detection cylinder and the overpressure cover in a sealing and sliding manner, the tooth groove is in meshing transmission with a driven gear, the driven gear is in meshing transmission with a driving gear, and the driving gear is fixed on an output shaft of the motor; the motor is driven by the motor driver, and the control end of the motor driver is in communication connection with the signal end of the PLC.

Preferably, the dc power supply outputs a constant current, the conductive block, the conductive sheet, the conductive pillar, and the conductive big end are all conductors, the conductive sheet is fixed in the insulating seat, the insulating seat is fixed in the valve cavity, and the insulating seat is made of an insulating material.

Preferably, a groove is formed in one side of the locking block, and the groove and the protrusion are clamped and assembled to relatively fix the locking block; the locking device comprises a locking plate, a locking rod, a locking spring, a locking mounting groove and a stop plate, wherein the protrusion is arranged on the locking plate, the locking plate is fixedly assembled with one end of the locking rod, the other end of the locking rod passes through the locking spring, the locking mounting groove and the stop plate and then is fixedly assembled with a driving plate, the locking mounting groove is arranged on the stop plate, and the stop plate is fixed in a valve cavity;

the driving plate is fixed with a driving column, the open end of the driving column is fixed with a driving pin, the driving pin is arranged in a driving chute, the driving chute is arranged on a movable plate, the movable plate is clamped and slidably arranged in a movable chute, the movable chute is arranged in a movable seat, and the movable seat is fixed in the valve cavity.

Preferably, the bottom of the movable plate and the top surface of the overpressure cover are respectively fixedly assembled with two ends of a return spring, and the return spring is a tension spring; the top of the movable plate is fixedly assembled with a telescopic shaft of the electromagnet, the electromagnet is fixed on the partition plate, the partition plate is fixed in the valve cavity, the power connection end of the electromagnet is in conductive connection with the movable contact of the contactor, the static contact of the contactor is in conductive connection with the power supply, and the control end of the contactor is in electrical connection with the signal end of the PLC.

Preferably, a second travel switch and a first travel switch are respectively installed at the top of the overpressure cover and at the corresponding positions of the partition plate and the locking block, and signal ends of the second travel switch and the first travel switch are respectively in communication connection with a signal end of the PLC.

The utility model has the advantages that: the utility model discloses simple structure, and the mode through forming the slide rheostat between conducting block, the conducting strip converts the needle displacement volume, and its precision can compare favourably with hall sensor, but with low costs, maintains simply, and is real durable than leather, very is applicable to among the vibration environment.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an enlarged view of fig. 1 at F1.

Fig. 3 is an enlarged view of fig. 1 at F2.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Referring to fig. 1 to 3, the electronic expansion valve detecting device of the present embodiment is installed in a valve housing 110, a hollow valve cavity 111 is inside the valve housing 110, a valve body 330 is installed inside the valve cavity 111, the valve body 330 is respectively provided with a passageway 332 and a valve hole 331, the valve hole 331 is communicated with one end of the passageway 332, the other end of the passageway 332 is communicated with an input pipe 310, and the input pipe 310 inputs liquid refrigerant; the valve hole 331 is engaged with and sealably assembled with one end of the valve needle 340 provided with the needle body 341, and the valve hole 331 is communicated with the output hole 320. In use, liquid refrigerant enters from the input pipe, then passes through the valve hole 331 to form a gaseous state (similar to an atomizing nozzle), and then is output from the output port to refrigerate an external medium, which is the basic principle of the current compression refrigeration equipment such as an air conditioner.

The valve body 330 is provided with an overpressure cover 410, the interior of the overpressure cover 410 is provided with a hollow inner cover 411, the inner cover 411 is communicated with the passageway 332 through a communicating groove 333, the inner cover 411 is internally provided with a detection cylinder 430 in a clamping, sealing and sliding manner, a detection spring 420 is arranged between the top of the detection cylinder 430 and the top of the inner cover 411, and the detection spring 420 is used for generating elastic force for preventing the detection cylinder 430 from moving upwards;

the detection cylinder 430 is fixedly provided with a detection rod 431, one end of the detection rod 431 penetrates through the overpressure cover 410 and then enters the overpressure detection cavity 451 and is fixedly assembled with the trigger plate 440, the trigger plate is slidably installed in the overpressure detection cavity 451, the trigger end of the trigger plate 440 is opposite to the trigger end of the overpressure switch 220, the overpressure switch 220 is fixedly arranged in the overpressure detection cavity 451, and the overpressure detection cavity 451 is arranged inside the overpressure detection box 450. A limiting plate 452 is further fixed in the overvoltage detection cavity 451 near the overvoltage switch 220, and the limiting plate 452 is used for limiting the maximum displacement of the trigger plate to the overvoltage switch, so that the overvoltage switch is prevented from being damaged by the pressure. In this embodiment, the signal terminal of the over-voltage switch is connected to the signal terminal of the PLC, the PLC is installed in the electrical box 280, and the over-voltage switch selects the micro-switch. During the use, in case the passageway internal pressure is too big, then can drive and detect a section of thick bamboo and overcome the elasticity that detects spring 420 and shift up, until triggering the excessive pressure switch, PLC input signal after the excessive pressure switch is triggered, PLC judges for the excessive pressure to adjust valve needle position, further open the valve hole and carry out the pressure release.

The valve needle 340 is fixed on one end of the adjusting rod 350, the other end of the adjusting rod 350 respectively penetrates through the detecting cylinder 430 and the overpressure cover 410, one end of the adjusting rod 350, which penetrates through the overpressure cover 410, is respectively fixed with a locking block 830 and a tooth space 351, the adjusting rod 350 is respectively assembled with the detecting cylinder 430 and the overpressure cover 410 in a sealing and sliding manner, the tooth space 351 is in meshing transmission with the driven gear 512, the driven gear 512 is in meshing transmission with the driving gear 511, the driving gear 511 is fixed on an output shaft of the motor 230, and the driving gear 511 can be driven to rotate circumferentially after the motor 230 is.

The motor 230 is driven by a motor driver, the motor 230 is a stepping motor or a servo motor, and a control end of the motor driver is in communication connection with a signal end of the PLC, so that the PLC can control the operation of the motor. The top of the adjusting rod 350 is fixedly assembled with an adjusting cylinder 740, a hollow adjusting inner cylinder 741 is arranged inside the adjusting cylinder 740, a conductive big end 720 is clamped and slidably assembled inside the adjusting inner cylinder 741, one end of the conductive big end 720 is electrically connected with a first conducting wire 251, a conductive post 721 is fixed at the other end of the conductive big end 720, the conductive post 721 penetrates through the adjusting cylinder 740 and the adjusting spring 730 and is electrically connected with a conductive block 261, the adjusting spring 730 is used for generating elastic force for pushing the conductive block 261 to the conductive sheet 262, so that the conductive block 261 is always kept to be tightly pressed and electrically conductive with the conductive sheet 262, one end of the conductive sheet 262 is electrically connected with a second conducting wire 252, the first conducting wire 251 is electrically connected with a positive electrode of a direct-current power supply, the second conducting wire 252 is electrically connected with a negative electrode of the direct-current power supply, the second conducting wire 252 and the first conducting wire 251 are respectively electrically connected with a negative electrode and a, The voltage value between the first conducting wires 251 and the signal end of the voltmeter are in communication connection with the signal end of the PLC. The DC power supply is used to output a constant current, and in this embodiment, the DC power supply is an AC-DC converter. When the valve needle is used, the sliding rheostat is formed between the conducting strips and the conducting blocks, the conducting blocks are in contact conduction with the conducting strips at different parts, so that the resistance between the conducting strips is changed, the voltage is changed accordingly, the resistance value between the conducting strips and the conducting blocks can be calculated through the change of the voltage, only the resistance value at the conducting strips is changed, the contact positions of the conducting strips and the conducting blocks can be deduced according to the size, the conductivity and the like of the conducting strips, the positions of the conducting strips on the conducting strips are converted, and the displacement and the relative position of the valve needle are calculated (when the valve needle is in the initial state, the parameter values at the moment are required to be collected completely). The design structure is very simple, the accuracy rate is high, and the device is more real and durable.

The conductive block 261, the conductive sheet 262, the conductive column 721 and the conductive big end 720 are all conductors, the conductive sheet 262 is fixed in the insulating seat 710, and the insulating seat 710 is fixed in the valve cavity 111.

A groove 831 is arranged on one side of the locking block 830, and the groove 831 is clamped and assembled with the protrusion 821 to fix the locking block relatively, namely, fix the adjusting rod and the valve needle axially; the boss 821 is arranged on the locking plate 820, the locking plate 820 and one end of the locking rod 633 are assembled and fixed, the other end of the locking rod 633 passes through the locking spring 840, the locking installation groove 811 and the stop plate 810 and then is assembled and fixed with the driving plate 630, the locking installation groove 811 is arranged on the stop plate 810, the stop plate 810 is fixed in the valve cavity 111, and the locking spring 840 is used for generating pushing force for the locking plate 820 to move towards the locking block 830;

a driving column 631 is fixed on the driving plate 630, a driving pin 632 is fixed on an open end of the driving column 631, the driving pin 632 is installed in a driving chute 611, the driving chute 611 is arranged on the movable plate 610, the movable plate 610 is clamped and slidably installed in the movable chute 131, the movable chute 131 is arranged in the movable seat 130, and the movable seat 130 is fixed in the valve cavity 111;

the bottom of the movable plate 610 and the top surface of the overpressure cover 410 are respectively assembled and fixed with two ends of a return spring 620, and the return spring is a tension spring; the top of the movable plate 610 is fixedly assembled with a telescopic shaft of the electromagnet 210, the electromagnet is fixed on the partition plate 120, the partition plate 120 is fixed in the valve cavity, the power connection end of the electromagnet 210 is electrically connected with the movable contact of the contactor, the static contact of the contactor is electrically connected with a power supply, and the control end of the contactor is electrically connected with the signal end of the PLC, so that the PLC can control the start and stop of the electromagnet 210.

At the initial state, the movable plate 610 is pulled downwards by the return spring 620, so that the driving inclined groove 611 is always at the bottommost part, the locking spring generates a thrust force to the locking block on the locking plate 820 at the moment, and the locking plate 820 is tightly matched with the locking block to relatively fix the adjusting rod.

When the valve needle needs to be adjusted, the PLC controls the contactor to be closed, the electromagnet is electrified to drive the movable plate 610 to move upwards, so that the driving chute 611 enables the locking plate 820 to overcome the elastic force of the locking spring 840 to move towards the stop plate through the driving pin, and the locking plate is separated from the locking block; then the motor is started, and the position of the valve needle can be adjusted by axially adjusting the adjusting rod through the meshing of the driven gear and the tooth socket.

Preferably, the top of the overpressure cover 410 and the corresponding position of the partition 120 and the locking block are respectively provided with a second travel switch 272 and a first travel switch 271, and the signal ends of the second travel switch 272 and the first travel switch 271 are respectively in communication connection with the signal end of the PLC. When the locking block triggers the second travel switch 272 or the first travel switch 271, the PLC determines that the upward or downward movement reaches the maximum position.

The details of the present invention are well known to those skilled in the art.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. The electronic expansion valve detection device is arranged in a valve shell, a hollow valve cavity is arranged in the valve shell, a valve body is arranged in the valve cavity, the valve body is respectively provided with a passageway and a valve hole, the valve hole is communicated with one end of the passageway, the other end of the passageway is communicated with an input pipe, and liquid refrigerating fluid is input into the input pipe; valve opening and needle are provided with the one end block of needle body, can seal the assembly, and valve opening and delivery port intercommunication, characterized by:

the needle is fixed and is served at regulation pole one, and the regulation pole other end passes detection section of thick bamboo, excessive pressure cover respectively, it is fixed with the assembly of regulation section of thick bamboo top, and regulation section of thick bamboo is inside to be hollow regulation inner tube, and block, slidable are equipped with the electrically conductive main aspects in the regulation inner tube, and electrically conductive main aspects one end is connected with first wire is electrically conductive, is fixed with on the other end and leads electrical pillar, leads electrical pillar and is connected with the conducting block is electrically conductive after passing regulation section of thick bamboo, adjusting spring, and adjusting spring is used for producing the elasticity that promotes to the conducting block, conducting strip one end is connected with second wire is electrically conductive, first wire is connected with DC power supply's positive electrically conductive, the second wire is connected with DC power supply's negative pole electrically conductive, second wire, first wire are connected with negative pole, the anodal electrically conductive of voltmeter respectively, and.

2. The electronic expansion valve detecting device according to claim 1, wherein: the valve body is provided with an overpressure cover, a hollow inner cover is arranged in the overpressure cover, the inner cover is communicated with the passageway through a communicating groove, a detection cylinder is clamped, sealed and slidably assembled in the inner cover, and a detection spring is arranged between the top of the detection cylinder and the top of the inner cover;

3. The electronic expansion valve detecting device according to claim 2, wherein: a limiting plate is further fixed near the overvoltage switch and in the overvoltage detection cavity and used for limiting the maximum displacement of the trigger plate to the overvoltage switch, a signal end of the overvoltage switch is in communication connection with a signal end of a PLC, and the PLC is installed in the electric box.

4. The electronic expansion valve detecting device according to claim 1, wherein: a locking block and a tooth groove are respectively fixed on one end of the adjusting rod, which penetrates out of the overpressure cover, the adjusting rod is respectively assembled with the detection cylinder and the overpressure cover in a sealing and sliding manner, the tooth groove is in meshing transmission with a driven gear, the driven gear is in meshing transmission with a driving gear, and the driving gear is fixed on an output shaft of a motor; the motor is driven by the motor driver, and the control end of the motor driver is in communication connection with the signal end of the PLC.

5. The electronic expansion valve detecting device according to claim 1, wherein: the direct-current power supply outputs constant current, the conductive block, the conductive sheet, the conductive column and the conductive big end are all conductors, the conductive sheet is fixed in the insulating seat, the insulating seat is fixed in the valve cavity, and the insulating seat is made of insulating materials.

6. The electronic expansion valve detecting device according to claim 4, wherein: a groove is formed in one side of the locking block, and the groove and the protrusion are clamped and assembled to relatively fix the locking block; the locking device comprises a locking plate, a locking rod, a locking spring, a locking mounting groove and a stop plate, wherein the protrusion is arranged on the locking plate, the locking plate is fixedly assembled with one end of the locking rod, the other end of the locking rod passes through the locking spring, the locking mounting groove and the stop plate and then is fixedly assembled with a driving plate, the locking mounting groove is arranged on the stop plate, and the stop plate is fixed in a valve cavity;

7. The electronic expansion valve detecting device according to claim 6, wherein: the bottom of the movable plate and the top surface of the overpressure cover are respectively assembled and fixed with two ends of a return spring, and the return spring is a tension spring; the top of the movable plate is fixedly assembled with a telescopic shaft of the electromagnet, the electromagnet is fixed on the partition plate, the partition plate is fixed in the valve cavity, the power connection end of the electromagnet is in conductive connection with the movable contact of the contactor, the static contact of the contactor is in conductive connection with the power supply, and the control end of the contactor is in electrical connection with the signal end of the PLC.

8. The electronic expansion valve detecting device according to claim 6, wherein: and the top of the overpressure cover, the corresponding positions of the partition plate and the locking block are respectively provided with a second travel switch and a first travel switch, and the signal ends of the second travel switch and the first travel switch are respectively in communication connection with the signal end of the PLC.