CN220669838U

CN220669838U - Electromagnetic driving type electronic expansion valve with signal feedback

Info

Publication number: CN220669838U
Application number: CN202321823426.8U
Authority: CN
Inventors: 李江; 陆新宇; 史云龙; 卢世军; 李志凯
Original assignee: SUZHOU XINZHI ELECTRO-MECHANICAL INDUSTRIES CO LTD
Current assignee: SUZHOU XINZHI ELECTRO-MECHANICAL INDUSTRIES CO LTD
Priority date: 2023-07-12
Filing date: 2023-07-12
Publication date: 2024-03-26
Anticipated expiration: 2033-07-12

Abstract

The utility model relates to the technical field of automobile air conditioners and discloses an electromagnetic drive type electronic expansion valve with signal feedback, which comprises a valve body and a valve core, wherein a valve cavity, a radial channel and an axial channel are formed in the valve body; the valve body is provided with a driving mechanism for driving the valve core to axially move, and the valve body is also provided with an opening detection mechanism for detecting the opening of the valve port; the sensor circuit control panel component is used for sensing the displacement magnetic field variation caused by the motion of the permanent magnet, so as to measure the opening variation of the valve port; the structure device can solve the problem that the existing expansion valve cannot accurately control the opening of the valve port, so that an air conditioning system can conveniently identify the actual working state of the valve port, and the accurate control and fault alarm of the opening of the valve port of the electronic expansion valve can be realized.

Description

Electromagnetic driving type electronic expansion valve with signal feedback

Technical Field

The utility model relates to the technical field of automobile air conditioners, in particular to an electromagnetic driving type electronic expansion valve with signal feedback.

Background

The electronic expansion valve is a throttling element capable of entering the refrigerant flow of the refrigerating device according to a preset program; in some occasions with severe load variation or wider operating condition range, the system (such as a new energy automobile heat pump system) with more accurate requirements on the superheat control of the evaporator can not meet the requirements on comfort and energy conservation, and the traditional throttling elements (such as a capillary tube, a thermal expansion valve and the like) are increasingly widely applied by combining the variable capacity technology of the compressor.

Existing electronic expansion valves for automotive air conditioning systems generally fall into two categories:

(1) Motor driving type: the expansion valve is a needle valve directly driven by a pulse stepping motor. When the pulse voltage of the control circuit acts on each phase coil of the motor stator according to a certain logic relationship, the motor rotor made of the permanent magnet generates rotary motion under the action of magnetic moment, and the needle valve is enabled to ascend or descend through the transmission of threads, so that the flow of the valve is regulated.

(2) Electromagnetic drive type: after the electromagnetic coil of the expansion valve is electrified, the electromagnetic iron core axially displaces to push the needle valve to ascend or descend, the flow of the valve is regulated, and the position of the needle valve is determined by the electromagnetic force generated by the current of the coil and the counter force balance of the supporting spring.

The two types of electronic expansion valves are characterized in that: the control precision of the valve port of the motor-driven electronic expansion valve is high, LIN communication (Local Interconnect Network is a serial communication network with low cost for realizing the control of a distributed electronic system in an automobile) can be realized, and the opening of the valve port is monitored; the electromagnetic driven electronic expansion valve has the advantages of quick valve opening action, quick response within 200 milliseconds, simple structure, low working noise and high reliability; but cannot realize accurate detection of the valve port opening and fault alarm, which will affect the practical performance.

Disclosure of Invention

The utility model aims to solve the problem of providing an electromagnetic driving type electronic expansion valve with signal feedback, and the opening detection mechanism with the structure can directly output the valve core displacement through signals, so that an air conditioning system can conveniently identify the actual working state of a valve port, and the accurate control of the valve port opening of the electronic expansion valve is realized.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an electromagnetic driving type electronic expansion valve with signal feedback comprises a valve body and a valve core, wherein a valve cavity, a radial channel and an axial channel which are mutually communicated are formed in the valve body, one end of the valve core penetrates through the axial channel to extend into the valve cavity, and a valve port is formed between the valve core and the axial channel; the valve body is provided with a driving mechanism for driving the valve core to move along the axial direction, and the driving mechanism comprises a stator component and a moving component which is in butt joint with the top of the valve core; the valve body is also provided with an opening detection mechanism for detecting the opening of the valve port, the opening detection mechanism comprises a permanent magnet arranged at the tail end of the moving part, and a sensing circuit control board assembly capable of detecting the magnetic field variation of the permanent magnet is arranged above the permanent magnet.

In a preferred embodiment of the utility model, the lower part of the valve core is provided with a conical surface, the bottom of the axial channel is provided with a round angle, and the sealing of the valve port adopts a line sealing mode that the conical surface contacts with the round angle.

In a preferred embodiment of the present utility model, the stator component includes a housing mounted on the top of the valve body, a fixed iron core is disposed in the housing, an electromagnetic coil assembly is sleeved outside the fixed iron core, and the moving component can drive the valve core to move axially after the electromagnetic coil assembly is electrified.

In a preferred embodiment of the utility model, a guide sleeve is arranged between the fixed iron core and the electromagnetic coil assembly, the moving component comprises a movable iron core movably embedded in the guide sleeve, a valve rod is fixedly connected to the bottom of the movable iron core, and one end of the valve rod penetrates through the fixed iron core and is fixedly connected with the valve core; the top of the movable iron core is fixedly connected with a fixed seat, and the permanent magnet is arranged at the top of the fixed seat.

In a preferred embodiment of the utility model, a junction box assembly is arranged above the shell, the junction box assembly comprises a box body arranged at the top of the shell, and a spacer is arranged between the box body and the electromagnetic coil assembly; the closed end of the guide sleeve extends to the inside of the box body, and the sensing circuit control board assembly is installed in the box body and is located above the closed end of the guide sleeve.

In a preferred embodiment of the utility model, an air outlet is formed on the outer side of the valve cavity, an elastic component for supporting the valve core is arranged in the valve cavity, and a limit spring is arranged between the fixing seat and the guide sleeve.

In a preferred embodiment of the utility model, the elastic component comprises a steel ball support contacted with the bottom end of the valve core, a supporting spring and a spring seat for supporting the supporting spring are arranged below the steel ball support, and the spring seat is fixedly embedded at the bottom of the valve cavity.

In a preferred embodiment of the utility model, the valve core and the axial channel are sealed by a sealing ring, and an air guide channel which is used for communicating the valve cavity and the upper cavity of the valve core is also arranged in the valve body along the axial direction.

The utility model solves the defects existing in the background technology, and has the beneficial effects that:

(1) In the utility model, the valve core and the permanent magnet synchronously move along with the moving part, and the sensor circuit control panel component senses the displacement magnetic field variation caused by the movement of the permanent magnet, so as to measure the opening variation of the valve port; the structure device can solve the problem that the existing expansion valve cannot accurately control the opening of the valve port, so that an air conditioning system can conveniently identify the actual working state of the valve port, and the accurate control and fault alarm of the opening of the valve port of the electronic expansion valve can be realized.

(2) In the utility model, compared with a driving mode of a miniature motor, the electromagnetic driving structure is simpler, the fixed iron core generates electromagnetic force after the electromagnetic coil assembly is electrified, and the movable iron core directly drives the valve core to move so as to control the opening and closing of the valve port; the valve port can be opened and closed at a higher corresponding speed by the structure, and the noise generated during working is smaller.

Drawings

The utility model will be further described with reference to the drawings and examples.

FIG. 1 is a schematic view of the construction of a preferred embodiment of the present utility model;

FIG. 2 is a schematic view of the structure of a valve body according to a preferred embodiment of the present utility model;

FIG. 3 is a schematic view of the structure of the air guide channel according to the preferred embodiment of the present utility model;

wherein, 1, the valve body; 101. a radial passage; 102. an axial passage; 103. a valve cavity; 104. an air outlet; 2. a valve core; 3. a valve stem; 401. a housing; 402. an electromagnetic coil assembly; 403. fixing an iron core; 404. a movable iron core; 501. a fixing seat; 502. a permanent magnet; 503. a sensing circuit control board assembly; 6. guide sleeve; 7. a case body; 8. an elastic component; 801. a steel ball support; 802. a spring seat; 803. a support spring; 9. a spacer bush; 10. a limit spring; 11. and an air guide channel.

Detailed Description

The utility model will now be described in further detail with reference to the drawings and examples, which are simplified schematic illustrations of the basic structure of the utility model, which are presented only by way of illustration, and thus show only the structures that are relevant to the utility model.

As shown in fig. 1-2, an electromagnetic driving type electronic expansion valve with signal feedback comprises a valve body 1 and a valve core 2, wherein a radial channel 101, an axial channel 102 and a valve cavity 103 are formed on the valve body 1, and the radial channel 101 and the axial channel 102 are communicated with each other and are vertical to each other; one end of the valve core 2 passes through the axial channel 102 to extend into the valve cavity 103, a valve port is formed between the valve core and the axial channel 102, and an air outlet 104 is formed at the outer side of the valve cavity 103; the radial passage 101 serves as an intake port connected to a discharge line from the compressor; the air outlet 104 is connected with a pipeline of the evaporator (or condenser).

Specifically, the lower part of the valve core 2 is provided with a conical surface, the bottom of the axial channel 102 is provided with a round angle, the sealing of the valve port adopts a line sealing mode that the conical surface contacts with the round angle, and the taper of the conical surface of the lower part of the valve core 2 is related to the curve of flow opening; the diameter D3 of the sealing line when the valve port is opened is substantially the same as the diameters D1 and D2 of the valve core 2 in the axial passage 102, and the purpose is to balance the pressure acting on the inlet portion of the valve core 2; when the valve port is opened, air flow enters from the radial channel 101, enters the valve cavity 103 downwards along the axial channel 102, is discharged through the air outlet 104, the vertical distance between the circular angle surface and the conical surface is the opening of the valve port, and the opening of the valve port can be controlled by controlling the movement of the valve core 2 in the axial channel 102.

Further, the valve core 2 and the axial channel 102 are sealed by a sealing ring, so that gas entering through the radial channel 101 cannot enter the upper space of the valve body 1, and the risk of clamping stagnation caused by impurity flow in the refrigerant is reduced.

As shown in fig. 3, an air guide channel 11 for communicating the valve cavity 103 with the upper cavity of the valve core 2 is also axially arranged in the valve body 1; based on the fact that the dimensions of the valve core 2 and the valve core 2 are basically the same, after the valve cavity 103 is communicated with the cavity at the upper part of the valve core 2 through the air guide channel 11, the gas pressure born by the top and the bottom of the valve core 2 can be the same, and therefore the valve core can be kept in an equilibrium state.

As shown in fig. 1, a driving mechanism is provided in the valve body 1 so that the valve element 2 can be driven to move in the axial direction to control the opening degree of the valve port.

The driving mechanism comprises a stator component and a moving component; the stator component comprises a shell 401 arranged at the top of the valve body 1, a fixed iron core 403 is arranged in the shell 401, and an electromagnetic coil assembly 402 is sleeved outside the fixed iron core 403; the electromagnetic coil assembly 402 includes an annular bracket and a coil wound on the bracket, based on the relation between the electromagnetism, a certain magnetic field is generated inside the coil after the coil is electrified, and the fixed iron core 403 has the function of increasing the magnetic field intensity, so that the moving component is subjected to the action of magnetic force under the action of the magnetic field, and the valve core 2 is driven to move along the axial direction.

The guide sleeve 6 is arranged between the fixed iron core 403 and the electromagnetic coil assembly 402, the moving component comprises a movable iron core 404 movably embedded in the guide sleeve 6, the bottom of the movable iron core 404 is fixedly connected with the valve rod 3, and one end of the valve rod 3 passes through the fixed iron core 403 and is fixedly connected with the valve core 2; the guide sleeve 6 is used for limiting the freedom degree of the movable iron core 404 so that the movable iron core can only move along the axial direction; under the action of electromagnetic field, the movable iron core 404 is attracted to drive the valve core 2 to move through the valve rod 3; the larger the current flowing into the electromagnetic coil assembly 402 is, the larger the valve core 2 moves downwards, until the valve port is completely opened; the guide sleeve 6 and the shell 401 are preferably sealed by an O-shaped sealing ring so as to ensure that refrigerating fluid cannot enter the electromagnetic coil part.

The motor-free rotating assembly and the screw transmission pair are not used, the reliability of electromagnetic driving is high, the failure rate is low, and the control precision is not reduced due to screw abrasion.

As shown in fig. 1, the valve body 1 is further provided with an opening detecting mechanism for detecting the opening of the valve port, and the magnetic fluxes at different positions in the magnetic field are different, so that the amount of change of the displacement of the target object can be known by detecting the change of the magnetic flux of the target object, thereby determining the opening of the valve port.

The opening detection mechanism includes a permanent magnet 502, the position of the permanent magnet 502 is outside the upper end of the magnetic field generated by the electromagnetic coil assembly 402, the top of the movable iron core 404 is fixedly connected with a fixed seat 501, and the permanent magnet 502 is disposed on the top of the fixed seat 501, i.e. the displacement of the movable iron core 404 can drive the permanent magnet 502 to perform the same displacement, and the permanent magnet 502 itself has the magnetic field; based on this, a sensing circuit control board assembly 503 capable of detecting the magnetic field variation of the permanent magnet 502 is disposed above the permanent magnet 502, so as to determine the displacement of the permanent magnet 502 through the magnetic field variation of the permanent magnet 502, and further accurately calculate the opening of the valve port.

Specifically, the sensing circuit control board component 503 includes a corresponding magnetic field sensor and a circuit control board, and specifically includes a linear hall sensor WSH138, a dual-channel amplifier LM358, an adjustable potentiometer, a red LED lamp, a patch capacitor 100nF, and the like; the magnetic field sensor can be used for detecting a magnetic field and changes thereof, and the application thereof can be divided into direct application and indirect application; the former is to directly detect the magnetic field or magnetic property of the detected object, and the latter is to detect the magnetic field set by the person on the detected object and take the magnetic field as the carrier of the detected information; converting physical quantities such as force, torque, pressure, stress, position, displacement, speed, acceleration, angle, angular velocity, rotating speed and rotating speed into electric signals; and the connection of the signals and the corresponding systems is controlled by a circuit, namely the signals for controlling the displacement change are connected with an automobile air conditioner control system.

A junction box assembly is arranged above the shell 401 and comprises a box body 7 arranged at the top of the shell 401, and a spacer 9 is arranged between the box body 7 and the electromagnetic coil assembly 402; the closed end of the guide sleeve 6 extends to the inside of the box body 7, and the sensing circuit control board component 503 is installed in the box body 7 and is positioned above the closed end of the guide sleeve 6; the device can be signally connected to the corresponding system by means of a junction box assembly.

The valve cavity 103 is internally provided with an elastic component 8 for receiving the valve core 2, and the valve port is in a closed state in an initial state under the action of the elastic component 8.

The elastic component 8 comprises a steel ball support 801 contacted with the bottom end of the valve core 2, a supporting spring 803 and a spring seat 802 for supporting the supporting spring 803 are arranged below the steel ball support 801, and the spring seat 802 is fixedly embedded in the bottom of the valve cavity 103. The spring seat 802 and the valve body 1 can be fixed by riveting, interference fit or screw fit, and the setting of the valve opening current can be controlled by adjusting the pressing-in amount of the spring seat 802.

Besides, a limit spring 10 is arranged between the fixed seat 501 and the guide sleeve 6, and the limit spring 10 adopts a tower-type spiral spring, namely, an elastic motion assembly is formed between the valve core 2 and the moving part, the permanent magnet 502 and the limit spring 10, so that the valve core 2 can reach a stable equilibrium state under the action of electromagnetic force and spring force.

The working principle of the technical scheme disclosed above is as follows:

the initial state of the valve port is in a closed state under the action of the elastic component 8, and after the electromagnetic coil component 402 is electrified, the movable iron core 404 moves downwards under the action of electromagnetic force and pushes the valve core 2 to move downwards through the valve rod 3; the bottom end of the valve core 2 is contacted with the steel ball support 801, a supporting spring 803 is supported between the steel ball support 801 and the spring seat 802, the supporting spring 803 generates a counter force after being compressed to resist electromagnetic thrust, the opening of the valve port is finally formed, the opening of the valve port is proportional to the current of the electromagnetic coil, and the larger the current of the electromagnetic coil is, the larger the downward movement stroke of the valve core 2 is, until the valve port is completely opened.

Because the fixed seat 501 and the permanent magnet 502 are fixedly arranged at the upper end of the movable iron core 404, the displacement change of the movable iron core 404 also causes the magnetic field intensity between the permanent magnet 502 and the sensing circuit control board assembly 503 arranged at the upper end of the electromagnetic coil to change, the sensing circuit control board assembly 503 can convert the magnetic field change into an electric signal to be transmitted to an air conditioner control system, and the air conditioner control system can accurately sense the opening of the valve port of the expansion valve and perform closed-loop control and fault alarm.

Since the diameter of the guiding part of the valve core 2 at the valve port pressure sensing part is basically the same as the diameter of the valve port sealing belt, namely the sizes of D1, D2 and D3 are basically the same, and the valve body 1 is provided with the air guide channel 11 for transmitting the pressure of the valve port outlet part to the upper end space of the valve body 1, the valve body 1 is provided with the air guide channel, so that: the valve core 2 is only subjected to electromagnetic thrust and spring resistance, which avoids pressure interference.

In summary, the electronic expansion valve with the structure can directly output the displacement of the valve core 2 through signals, so that an air conditioning system can recognize the actual working state of the valve port, and accurate control and fault alarm of the electronic expansion valve can be realized.

The above-described preferred embodiments according to the present utility model are intended to suggest that, from the above description, various changes and modifications can be made by the person skilled in the art without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.

Claims

1. The utility model provides an electromagnetic drive formula electronic expansion valve of tape signal feedback, includes valve body (1) and case (2), valve pocket (103) and radial passageway (101) and axial passageway (102) that link up each other have been seted up on valve body (1), the one end of case (2) is passed axial passageway (102) extend to in valve pocket (103), and with form the valve port between axial passageway (102), its characterized in that: the valve body (1) is provided with a driving mechanism for driving the valve core (2) to move along the axial direction, and the driving mechanism comprises a stator component and a moving component which is in butt joint with the top of the valve core (2); the valve body (1) is also provided with an opening detection mechanism for detecting the opening of the valve port, the opening detection mechanism comprises a permanent magnet (502) arranged at the tail end of the moving part, and a sensing circuit control board assembly (503) capable of detecting the magnetic field variation of the permanent magnet is arranged above the permanent magnet (502).

2. The electromagnetically driven electronic expansion valve with signal feedback as claimed in claim 1, wherein: the lower part of the valve core (2) is provided with a conical surface, the bottom of the axial channel (102) is provided with a round angle, and the sealing of the valve port adopts a line sealing mode that the conical surface is contacted with the round angle.

3. The electromagnetically driven electronic expansion valve with signal feedback as claimed in claim 1, wherein: the stator component comprises a shell (401) arranged at the top of the valve body (1), a fixed iron core (403) is arranged in the shell (401), an electromagnetic coil component (402) is sleeved outside the fixed iron core (403), and the moving component can drive the valve core (2) to move along the axial direction after the electromagnetic coil component (402) is electrified.

4. The electromagnetic driven electronic expansion valve with signal feedback of claim 3, wherein: a guide sleeve (6) is arranged between the fixed iron core (403) and the electromagnetic coil assembly (402), the moving component comprises a movable iron core (404) movably embedded in the guide sleeve (6), a valve rod (3) is fixedly connected to the bottom of the movable iron core (404), and one end of the valve rod (3) passes through the fixed iron core (403) and is fixedly connected with the valve core (2); the top of the movable iron core (404) is fixedly connected with a fixed seat (501), and the permanent magnet (502) is arranged at the top of the fixed seat (501).

5. The electromagnetic driven electronic expansion valve with signal feedback of claim 4, wherein: a junction box assembly is arranged above the shell (401), the junction box assembly comprises a box body (7) arranged at the top of the shell (401), and a spacer bush (9) is arranged between the box body (7) and the electromagnetic coil assembly (402); the closed end of the guide sleeve (6) extends to the inside of the box body (7), and the sensing circuit control board assembly (503) is installed in the box body (7) and is located above the closed end of the guide sleeve (6).

6. The electromagnetic driven electronic expansion valve with signal feedback of claim 5, wherein: an air outlet (104) is formed in the outer side of the valve cavity (103), an elastic assembly (8) for supporting the valve core (2) is arranged in the valve cavity (103), and a limit spring (10) is arranged between the fixing seat (501) and the guide sleeve (6).

7. The electromagnetic driven electronic expansion valve with signal feedback of claim 6, wherein: the elastic assembly (8) comprises a steel ball support (801) contacted with the bottom end of the valve core (2), a supporting spring (803) and a spring seat (802) for supporting the supporting spring (803) are arranged below the steel ball support (801), and the spring seat (802) is fixedly embedded in the bottom of the valve cavity (103).

8. The electromagnetic driven electronic expansion valve with signal feedback according to any of claims 2-7, wherein: the valve core (2) is sealed with the axial channel (102) through a sealing ring, and an air guide channel (11) which is communicated with the valve cavity (103) and the upper cavity of the valve core (2) is also arranged in the valve body (1) along the axial direction.