CN218672719U - Electronic expansion valve with circuit board - Google Patents

Abstract

The utility model discloses an electronic expansion valve with a circuit board, which comprises a stator assembly and a valve seat assembly, wherein the valve seat assembly is arranged at one side of the stator assembly; the stator assembly includes the shell and sets up the stator module in the shell inside, and the upper portion of shell is provided with the control installation cavity that is located the stator module upside, installs the circuit board in the control installation cavity, and stator module links to each other with the circuit board through the electrically conductive contact pin of its one side, the lateral part of shell is provided with the interface, and the interface is vertical setting up, links to each other through switching contact pin spare between interface and the circuit board. The utility model discloses the assembly precision is high, and structure integration degree is higher, can save the installation volume, has solved the various assembly problems among the current electronic expansion valve.

Description

Electronic expansion valve with circuit board

Technical Field

The utility model relates to an electronic expansion valve field specifically is an electronic expansion valve that has a circuit board that precision is high, energy-conserving effect is obvious, simple structure, simple to operate, have the balanced pressure function.

Background

Energy conservation and emission reduction are problems to be solved urgently by people nowadays. The throttling device plays a key role in the refrigeration system, and the energy consumption of the whole refrigeration system can be reduced by selecting a proper throttling mechanism to be matched with the refrigeration system. The working principle of throttling is that when the refrigerant flows through the valve, the flow section is suddenly contracted, the flow speed of the fluid is accelerated, and the pressure is reduced, so that the functions of regulating the flow, controlling the superheat degree and evaporating the liquid level are achieved. Therefore, the flow regulation of the throttling mechanism plays an important role in saving energy and reducing consumption of the refrigerating device. On some occasions with severe load change or wide operation condition range, the traditional throttling elements (such as capillary tubes, thermal expansion valves and the like) cannot meet the requirements on comfort and energy conservation. The temperature sensing package of the thermostatic expansion valve has obvious delay characteristic, and is difficult to cooperate with the displacement of the compressor to make quick and effective reaction to the flow change, finally resulting in the oscillation of system regulation, causing unstable machine operation, even damaging the compressor network, so the electronic expansion valve is gradually replacing the traditional throttling element. The electronic expansion valve is superior to the traditional throttling mechanism in superheat degree control (liquid level control) and flow regulation, and has the advantages of higher reaction speed, wider regulation range, more obvious energy-saving effect and wide application prospect. However, the existing electronic expansion valve has more parts and high assembly requirements, and has the following disadvantages:

(a) In order to realize better control of the conventional electronic expansion valve, a circuit board is generally additionally arranged in a stator. Due to structural limitations, the circuit board is generally disposed horizontally on the upper portion of the stator with the socket facing horizontally outward. The socket adopts a universal structure and size, so that the socket forms a convex structure on the stator, the length of the electronic expansion valve in the mounting direction of the socket is longer, and the mounting space of the electronic expansion valve is seriously influenced. The horizontal socket requires a certain space for the external connector in the horizontal direction, which further increases the volume of the heat pump and is very inconvenient for the connection of the connector in the horizontal direction. In addition, the stator assembly of the conventional electronic expansion valve is also provided with a circuit board which is instable in installation, is easy to collide and even damaged by static electricity, and directly influences the performance to cause failure;

(b) The valve body structure of the current electronic expansion valve generally comprises a valve base, a valve seat, a valve needle assembly and the like, wherein the valve base is pressed on the valve seat, and the valve needle is assembled in the valve base. The valve seat is provided with a thread surface for installation, the valve base is provided with a flow guide channel, the middle part of the valve seat is provided with a valve needle assembly, and the gap between the valve needle sealing surface and the valve base sealing surface is changed by controlling the up-and-down movement of the valve needle, so that the flow is regulated. The structure has more components, so that not only are more assembling procedures and more complex processes, but also more material waste is caused; valve base and disk seat need press fitting earlier, carries out laser welding again, and this is difficult to not only guarantee the axiality and the intensity of disk seat and valve base, and welded heat altered shape also influences critical dimension easily to laser welding's is with high costs.

(c) The magnetic rotor assembly of the conventional electronic expansion valve generally includes a magnetic rotor, a stop rod, and a fixing plate. The magnetic rotor and the fixed plate are molded together to form a magnetic rotor assembly, the stop rod is sleeved on the magnetic rotor, and the magnetic rotor can be damaged in an assembly mode and cannot be easily perceived.

(d) The existing nut assembly of the electronic expansion valve is generally matched with a sliding ring through a spring guide rail, an insert is molded on a nut in an injection mode, and then the tail end of the spring guide rail is clamped into a notch in the nut. This type of assembly may involve a risk of the spring rail being connected to the nut only loosely and thus falling off.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electronic expansion valve with circuit board, the assembly precision is high, and structure integration level is higher, can save the installation volume, has solved the various assembly problems among the current electronic expansion valve.

In order to achieve the above object, the utility model provides a following technical scheme: an electronic expansion valve with a circuit board comprises a stator assembly and a valve seat assembly, wherein the valve seat assembly is arranged on one side of the stator assembly; the stator assembly comprises a shell and a stator assembly arranged in the shell, wherein a control installation cavity located on the upper side of the stator assembly is arranged on the upper portion of the shell, a circuit board is installed in the control installation cavity, the stator assembly is connected with the circuit board through a conductive contact pin on one side of the stator assembly, a socket is arranged on the lateral portion of the shell and vertically arranged upwards, the socket is connected with the circuit board through a switching contact pin piece, the socket adopts a vertical arrangement mode to facilitate connection of an external connector, the length of a stator injection molding body in the horizontal direction is reduced through the socket in the vertical direction, and an installation space does not need to be reserved in the horizontal direction when the electronic expansion valve is loaded, so that the size of a heat pump is smaller, and the installation is more flexible.

The valve seat assembly comprises a valve seat, a nut component and a valve needle component, wherein the nut component is positioned on the upper side of the valve seat, the valve needle component is positioned in the valve seat, the nut component is positioned in a magnetic rotor component, the magnetic rotor component is positioned in a magnetic isolation pipe, the magnetic isolation pipe is positioned in a stator component, a first flow valve port is formed in the bottom of the valve seat, the nut component moves axially under the driving of the magnetic rotor component to drive the valve needle component to move axially, and the first flow valve port is blocked and opened.

Preferably, the valve needle component comprises a valve core sleeve and a valve needle, the valve needle is arranged at a first end of the valve core sleeve and is inserted into a first flow-through valve port at the bottom of the valve seat, a second end of the valve core sleeve is connected with one end of a screw rod in the nut component, a spring is arranged in the valve core sleeve, and one end of the spring is axially connected with one end of the valve needle; the inside axial of disk seat be provided with needle subassembly mounting hole, needle subassembly mounting hole in be provided with needle direction portion, the outside of needle be provided with needle direction boss, needle direction boss hug closely with needle direction portion, as an organic whole injection moulding between shell and the stator module, be provided with the connection rand between stator assembly and disk seat assembly, stator assembly with through hot rivet welding with be connected the rand and link to each other, there is hot riveting point the lower part of shell, the disk seat assembly passes through the screw thread on the disk seat and is connected with the valve body, stator assembly passes through the connection rand and links to each other with the valve body, press on the disk seat assembly, electronic expansion valve needs ground connection, connection rand direct mount welding is on the shell, with shell electric connection, the other end is fixed on the valve body, thereby realized the ground connection of shell, avoid static and magnetic field to disturb transmission and the feedback of control signal, avoid disturbing stator module's operation, and realized with the fixed connection of valve body and with the location of disk seat be connected, simple structure, simple to operate.

In this patent, disk seat formula structure as an organic whole, the valve base has been saved, needle part direct mount is in needle subassembly mounting hole, the case cover can carry out axial direction guide movement in needle subassembly mounting hole under the effect of screw rod, and the needle can realize the accurate lift of needle through the direction cooperation of needle direction boss with the needle guide part, the spring force that the spring produced is used for guaranteeing the sealed of needle and disk seat, reduce the impact force of needle to the disk seat when closing simultaneously, play the cushioning effect.

Preferably, the valve core sleeve is provided with a valve needle sleeve at one end corresponding to the valve needle, an opening is formed in the middle of the valve needle sleeve, a perforating shaft penetrating through the opening is arranged at one end of the valve needle, one end of the valve needle penetrates through the opening, a bushing is arranged on the inner side of the valve needle sleeve and comprises an annular base and a cylindrical part arranged on one side of the annular base, the spring is sleeved on the outer side of the cylindrical part and abuts against the annular base, one end of the valve needle is inserted into a central hole of the bushing to be connected, the valve needle sleeve and the valve core sleeve are in interference press fit, the perforating shaft can guide the lifting of the valve needle, the inserting shaft and the bushing are in interference press fit connection, the valve needle sleeve is limited in the valve core sleeve, the valve needle can be lifted by the valve needle sleeve when the valve core sleeve is lifted, and meanwhile, the bushing can position the spring.

As preferred, stator module include first skeleton and second skeleton, first skeleton and second skeleton be arranged from top to bottom, first skeleton and second skeleton on have the first coil and the second coil of having wound respectively, one side of first skeleton and second skeleton all stretch out and be provided with two at least boss A, all vertically be provided with a contact pin on every boss A at least, the one end tip that contact pin and boss A are connected expose at boss A outside formation coil link, the coil link on cup jointed the sleeve pipe, the sleeve pipe and the end connection of first coil or second coil, first coil and second coil need be connected with different contact pins, and adopt the sleeve pipe to be connected with first coil and second coil, because the sleeve pipe outside is circular, no edges and corners, can prevent effectively that the number of turns and the length of first coil and second coil from being drawn absolutely to the enameled wire when the winding on the sleeve pipe, can control winding angle and length etc. easily, also can prevent effectively that the enameled wire from being pulled apart, sleeve pipe and contact pin can carry out certain slip motion when the assembly, have certain pretightning force and the wire winding of certain compact, make the wire winding assembly have the cooperation more.

Preferably, the magnetic rotor assembly comprises a magnetic rotor and a fixing plate arranged at the upper end of the magnetic rotor, and further comprises a stop rod, the stop rod is located inside the magnetic rotor and is arranged along the axial direction of the magnetic rotor, one end of the stop rod is eccentrically connected with the fixing plate, the stop rod and the fixing plate are in interference press fit, the stop rod is in press fit with the fixing plate without complex installation methods, the structure is simple, the installation is convenient, the stop rod is prevented from being sleeved on the magnetic rotor, the magnetic rotor cannot be damaged, and the strength of the whole assembly is improved.

Preferably, a stop rod press-fitting groove is formed in the edge of one side of the fixing plate, a press-fitting plate is arranged at one end of the stop rod, the press-fitting plate is embedded into the stop rod press-fitting groove to be in interference fit, the stop rod press-fitting groove and the press-fitting plate are matched to realize rapid interference press-fitting combination between the stop rod and the press-fitting plate, and the press-fitting of the stop rod press-fitting groove and the press-fitting plate is favorable for integrated injection molding of the magnetic rotor.

Preferably, the nut component comprises a nut and a screw rod located at the axial center of the nut, the nut is installed at an opening on the upper side of the valve seat, an insert is fixedly arranged on the outer side of the nut, the insert is embedded into the opening of the valve seat and is pressed with the valve seat, the nut is combined with the valve seat through the insert, the insert is used for realizing press fitting and firm connection, the number of integral parts is small, the assembly is more convenient, the light weight is facilitated, the quality is better, and the cost is more advantageous.

Preferably, a press-fitting groove is formed in the opening of the valve seat, the insert is embedded and installed in the press-fitting groove, the height of the side wall of the press-fitting groove is larger than the thickness of the insert, a blank pressing part is formed at a part, higher than the insert, of the side wall of the press-fitting groove to press and fix the insert, the press-fitting groove can be used for positioning the insert, the blank pressing part can be used for press-fitting deformation, the insert is pressed conveniently, and firm connection is guaranteed.

Preferably, the nut member further includes a spring guide rail and a sliding ring, the nut includes a base portion and a cylinder disposed on one side of the base portion, the spring guide rail is sleeved on the outside of the cylinder, the sliding ring is sleeved on the outside of the cylinder and rotates around the spring guide rail while ascending and descending along the cylinder, a stopper is vertically disposed at a lower end of the spring guide rail, a limit groove is vertically disposed on a sidewall of the base portion, the stopper is embedded into the limit groove, limit protrusions are disposed on two sides of the limit groove, the limit protrusions can deform under an external force to cover the limit groove and limit the stopper in the limit groove, when the magnetic rotor assembly outside the nut member rotates, a stopper rod on the magnetic rotor assembly can shift the sliding ring to rotate around the spring guide rail and simultaneously ascend and descend, when the sliding ring moves to a position of the stopper, the magnetic rotor assembly cannot rotate, the stopper is embedded into the limit groove and is riveted by the limit protrusions, so that the spring guide rail can be securely mounted, the stopper is prevented from being separated from the limit groove, and a normal operation of the expansion valve can be guaranteed.

Preferably, the edge of the insert is provided with a plurality of first vent grooves, the side wall of the base part is provided with a second vent groove corresponding to the first vent grooves, the bottom of the valve seat is provided with a balance air passage communicated with the outside, the balance air passage enables a fluid medium to be filled in the upper cavity of the whole valve seat assembly so as to reduce the pressure difference between high pressure and low pressure at the inlet side and the outlet side, and the first vent grooves and the second vent grooves can not only ensure the strength of the nut and the insert, but also ensure the balance of air pressure realized by matching with the balance air passage.

Preferably, the middle of the control installation cavity is provided with a bulge, a valve body installation cavity penetrating through the stator assembly is formed inside the bulge, a through hole is formed in the middle of the circuit board, the bulge penetrates through the through hole, the bulge and the stator injection molding body are of an integrally formed structure, water vapor possibly existing in the valve body installation cavity cannot enter the control installation cavity, the sealing performance of the control installation cavity is improved, the bulge can position the circuit board, the circuit board is installed as low as possible, and the height of the whole stator is reduced.

Preferably, the bottom of control installation cavity be provided with a plurality of support protruding muscle for support the circuit board, the protruding muscle of support on be provided with a plurality of opening reference column, the opening reference column insert the locating hole that corresponds on the circuit board in to the circuit board fix a position, support protruding muscle can make the downside most region of circuit board be unsettled when improving the whole structural strength of stator body of moulding plastics, be favorable to the heat dissipation. The opening positioning column enables the circuit board to be installed more stably, shaking collision cannot occur, and even the circuit board is damaged by static electricity to lose efficacy.

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

(1) The socket on the outer casing is arranged upwards, so that the length of the electronic expansion valve in the horizontal direction is greatly reduced, the volume of the heat pump is reduced, the opening positioning column on the outer casing is provided with an open inverted buckle structure, the circuit boards are provided with positioning holes which are mutually assembled to be beneficial to positioning and fixing the circuit boards, and the circuit boards are prevented from falling and colliding;

(2) The valve seat adopts an integrated design, so that the number of parts is reduced, the coaxiality and strength of parts are improved, and the processing cost is reduced; the structure integration level is high, the number of parts is small, the assembly is more convenient, the light weight is facilitated, and the cost is more advantageous;

(3) The integrated insert and nut structure is adopted, the firm connection between the nut and the valve seat is realized by pressing the insert and the valve seat, the integration degree of the whole structure of the valve seat and the nut assembly is high, the number of parts is small, the assembly is more convenient, the light weight is facilitated, the quality is better, and the cost is more advantageous; the insert and the nut are provided with vent grooves to reduce the pressure difference between high pressure and low pressure at the inlet side and the outlet side;

(4) The magnetic rotor adopts an integrated design, is integrally formed with the fixed plate and the stop rod, and has high integral strength; the fixed plate and the stop rod are connected in an interference press-fitting mode, so that the magnetic rotor is prevented from being damaged by the stop rod, the functionality and the strength of parts are improved, and the processing cost is reduced;

(5) The nut and the spring guide rail are connected in a new way, the stop part of the spring guide rail can be firmly limited through the limiting groove and the bulge part, the nut is prevented from being separated from the spring guide rail, and the integral strength of the assembly is greatly improved;

(6) Set up the sleeve pipe at the tip of contact pin and connect the enameled wire, can prevent that the enameled wire from being drawn absolutely by contact pin edges and corners, the sleeve pipe can rotate, can adjust rotation angle wantonly, adjusts wire-wound pretightning force and holistic structural strength.

Drawings

FIG. 1 is a three-dimensional structure of the present invention;

FIG. 2 is a three-dimensional exploded view of the present invention;

fig. 3 is a three-dimensional exploded structural view of the stator assembly of the present invention;

FIG. 4 is a sectional view of the stator assembly of the present invention

Fig. 5 is a three-dimensional structure diagram of the housing of the present invention;

FIG. 6 is a cross-sectional view of the valve seat assembly of the present invention;

FIG. 7 is a block diagram of the bushing of the present invention;

FIG. 8 is a view of the structure of the valve needle sheath of the present invention;

fig. 9 is a structural view of the valve needle of the present invention;

fig. 10 is a schematic structural diagram of a first coil according to the present invention;

FIG. 11 is a schematic diagram of the pin of the present invention;

FIG. 12 is a partial cross-sectional structural view of the present invention;

fig. 13 is a perspective view of the nut assembly of the present invention;

fig. 14 is a perspective view of the nut assembly of the present invention;

fig. 15 is a top cross-sectional structural view of the nut assembly of the present invention;

fig. 16 is a three-dimensional structure view of the connection between the nut and the valve seat of the present invention;

fig. 17 is a sectional view of the nut and the valve seat of the present invention;

fig. 18 is a structural view of an insert of the present invention;

FIG. 19 is an exploded view of the magnetic rotor assembly of the present invention;

fig. 20 is a partial perspective view of the magnetic rotor assembly according to the present invention.

Reference numerals:

stator assembly 1, connecting collar 2, valve seat assembly 3, housing 11, second row of pins 110, opening positioning column 112, supporting convex rib 113, conductive pin 114, valve body mounting cavity 115, hall sensor assembly 116, stator assembly 12, boss 13, control mounting cavity 14, circuit board 16, socket 17, first row of pins 18, connecting block 19, stator housing 121, pin 123, electromagnetic pole plate 124, first skeleton 1211, second skeleton 1212, first coil 1221, second coil 1222, first pin 1231, second pin 1232, third pin 1233, fourth pin 1234, sleeve 1241, valve seat 31, limiting step 3132, pressing part 1, pressing groove 3134, nut part 32, nut 321, insert 322, spring guide 324, slip ring 325, stop portion 3211, groove 3222, first vent groove 3231, balance flow channel 32, base portion 3241, cylinder 3242, second vent groove 3243, limiting groove 3245, limiting protrusion 3246, flat cut surface 3247, screw 323, valve needle member 33, valve core housing 332, valve ball 334, spring 335, bushing 336, annular base 3361, first conical surface 3362, cylindrical portion 3363, first crimping portion 3364, guide portion 3365, valve needle housing 337, second conical surface 3371, second crimping portion 3372, limiting boss 3373, valve needle 338, cylindrical transition portion 3381, valve needle guide boss 3382, conical guide portion 3385, conical seal portion 3386, second flow valve port 3311, first flow valve port 3313, valve needle guide portion 3314, valve needle assembly mounting hole 3315, magnetic rotor assembly 34, fixing plate 341, stop rod 342, magnetic rotor 343, stop rod press-fit groove 3411, press-fit plate 3421, magnetic isolation tube 35, outer leak O-type seal 41, inner leak O-type seal 42, boss a.

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.

As shown in fig. 1-20, the present invention provides the following technical solutions to solve various problems in the prior art: an electronic expansion valve with a circuit board comprises a stator assembly 1 and a valve seat assembly 3, wherein the valve seat assembly 3 is arranged on one side of the stator assembly 1; the stator assembly 1 comprises a shell 11 and a stator assembly 12 arranged inside the shell 11, a control installation cavity 14 located on the upper side of the stator assembly 12 is arranged on the upper portion of the shell 11, a circuit board 16 is installed in the control installation cavity 14, the stator assembly 12 is connected with the circuit board 16 through a conductive contact pin 114 on one side of the stator assembly, a socket 17 is arranged on the side portion of the shell 11, the socket 17 is vertically arranged upwards, the socket 17 is connected with the circuit board 16 through a switching contact pin piece, the socket is vertically arranged, connection of external connectors is facilitated, the length of a stator injection molding body in the horizontal direction is reduced through the socket in the vertical direction, and an installation space does not need to be reserved in the horizontal direction when the electronic expansion valve is loaded, so that the heat pump is smaller in size and more flexible in installation.

The valve seat assembly 3 comprises a valve seat 31, a nut member 32 positioned on the upper side of the valve seat 31, and a valve needle member 33 positioned in the valve seat 31, wherein the nut member 32 is positioned in a magnetic rotor assembly 34, the magnetic rotor assembly 34 is positioned in a magnetic isolation pipe 35, the magnetic isolation pipe 35 is positioned in the stator assembly 12, and the valve needle member 33 is coaxially arranged in the valve seat 31.

Specifically, the housing 11 and the socket 17 are of an integral injection molding structure, the adapter pin is wrapped by the housing 11 and installed when the housing 11 is injection molded, the hall sensor assembly 116 can be installed on the lower side of the circuit board 16 close to the stator assembly 12, and the hall sensor assembly 116 includes a hall element and a hall bracket and is used for measuring a magnetic field around the current of the coil. The hall bracket may be replaced with other sensors to achieve the same effect.

Switching contact pin spare include connecting block 19, set up at the one end of connecting block 19 and vertically insert the first row of needle 18 in interface 17 and set up at the other end of connecting block 19 and the vertical second row of needle 110 that links to each other with circuit board 16, first row of needle 18 and second row of needle 110 correspond and link to each other, connecting block 19 shaping can prevent that first row of needle 8 and second row of needle 10 from being broken by injection pressure when shell 11 is moulded plastics, guarantees that the location of contact pin is accurate, makes the structure more stable firm, is favorable to external signal's stable receipt.

Wherein, connecting block 19 be horizontal setting or vertical setting, can adjust as required, connecting block 19 can rational utilization shell 11 in limited space, in this embodiment, shell 11's top install the top cap 15 that is used for sealed control installation cavity 14, top cap 15 sets up the installation and the maintenance that make things convenient for circuit board 16, simultaneously, control installation cavity 14's middle part be provided with bellying 13, bellying 13's inside form the valve body installation cavity 115 that runs through stator module 12, bellying 13 and shell 11 are the integrated into one piece structure, steam that valve body installation cavity 115 probably exists can not enter into control installation cavity 14, has improved the leakproofness of control installation cavity 14. Specifically, the top cover 15 is fitted to the housing 11, and is typically sealed by ultrasonic welding to seal the structure including the circuit board and the like inside the stator. The middle part of the circuit board 16 is provided with a through hole, the bulge part 13 passes through the through hole, and the bulge part 13 can position the circuit board 16, so that the circuit board 16 can be installed as low as possible, and the height of the whole stator is reduced.

In order to stably install the circuit board 16, the bottom of the control installation cavity 14 is provided with a plurality of supporting ribs 113 for supporting the circuit board 16, and the supporting ribs 113 can suspend most of the area of the lower side of the circuit board 16 while improving the whole structural strength of the stator injection molding body 1, thereby being beneficial to heat dissipation. Meanwhile, the support ribs 113 are provided with a plurality of opening positioning columns 12, and the opening positioning columns 112 are inserted into corresponding positioning holes in the circuit board 16 to position the circuit board 16, so that the circuit board 16 is more stably installed, cannot shake and collide, and even is damaged by static electricity to fail.

In this embodiment, the valve needle member 33 includes a valve core sleeve 332 and a valve needle 338, the valve needle 338 is disposed at a first end of the valve core sleeve 332 and is inserted into the first flow valve port 3313 at the bottom of the valve seat 31, a second end of the valve core sleeve 332 is connected to one end of the screw 323 in the nut member 32, a spring 335 is installed inside the valve core sleeve 332, and one end of the spring 335 is axially connected to one end of the valve needle 338; the inside axial of disk seat 31 be provided with needle subassembly mounting hole 3315, needle subassembly mounting hole 3315 in be provided with needle guide part 3314, the outside of needle 338 be provided with needle direction boss 3382, needle direction boss 3382 hug closely with needle guide part 3314, as an organic whole injection moulding between shell 11 and stator module 12, be provided with between stator assembly 1 and disk seat assembly 3 and connect rand 2, stator assembly 1 with through hot rivet welding and connect rand 2 and link to each other, there is hot rivet pressure point the lower part of shell 11, disk seat assembly 3 is connected with the valve body through the screw on the disk seat 31, stator assembly 1 links to each other with the valve body through connecting rand 2, press on disk seat assembly 3, electronic expansion valve need carry out ground connection, connect rand 2 direct mount welding on shell 11, with shell 11 electric connection, the other end is fixed on the valve body, thereby realized the ground connection of shell 11, avoid static and magnetic field interference control signal's transmission and feedback, avoid interfering with the operation, and realized being connected with stator module's fixed connection and being connected with the location of valve seat, simple structure, simple to install conveniently.

Specifically, when the electronic expansion valve starts to operate, the liquid high-pressure fluid medium throttles through the first circulation valve port 3313, so that the pressure of the high-pressure fluid medium decreases, the high-pressure fluid medium becomes a gas-liquid mixed fluid medium, and heat is released at the same time. The temperature-pressure sensor corresponding to the second flow valve port 3311 inputs the collected temperature signal and pressure signal to the controller, the controller outputs a signal to the electronic expansion valve after calculation according to a related control program, the current in the winding coil in the stator assembly 12 is controlled to change, so as to control the stator assembly 12 to generate a changing excitation magnetic field, the magnetic rotor assembly 34 rotates under the action of the excitation magnetic field, so as to drive the screw 323 to move, and further, the valve core sleeve 332 drives the valve needle 338 to move, so as to realize the opening change of the valve port of the electronic expansion valve, and further, the purpose of adjusting the flow rate and pressure of the fluid medium is achieved.

In order to ensure the sealing performance of the installation, an outer leakage O-ring 41 and an inner leakage O-ring 42 may be installed outside the valve seat assembly 3, and the outer leakage O-ring 41 and the inner leakage O-ring 42 are installed in the O-ring groove of the valve seat 31 of the valve seat assembly 3 to prevent the leakage of the fluid medium at the connection.

In this patent, the valve seat 31 is an integral structure, the valve base is omitted, the valve needle component 33 is directly installed in the valve needle assembly mounting hole 3315, the valve core sleeve 332 can perform axial guiding movement in the valve needle assembly mounting hole 3315 under the action of the screw 323, the valve needle 338 can realize accurate lifting of the valve needle 338 through the guiding cooperation of the valve needle guiding boss 3382 and the valve needle guiding part 3314, the spring force generated by the spring 335 is used for ensuring the sealing of the valve needle 338 and the valve seat 31, and meanwhile, the impact force of the valve needle 338 on the valve seat 31 when being closed is reduced, so that the buffering effect is achieved.

The valve core sleeve 332 is closed at one end far away from the valve needle 338, the valve ball 334 abutting against the closed end is arranged in the valve core sleeve 332, one end of the spring 335 is connected with the valve ball 334, the valve ball 334 is used for ensuring the axial fixation of the spring 335, meanwhile, the friction loss can be reduced by the contact of the spherical surface and the end surface of the inner cavity of the valve core sleeve 332, the screw 323 is fixedly connected with the closed section of the valve core sleeve 332 and can also be in rotating connection, the screw 323 can lift while rotating, the valve core sleeve 332 can also lift along with the screw, the valve ball 324 is simple to install, and the using effect is good.

In order to limit the space between one end of the valve needle 338 and the spring 335, the valve needle sleeve 337 is installed at one end of the valve core sleeve 332 corresponding to the valve needle 338, an opening is formed in the middle of the valve needle sleeve 337, a perforated shaft penetrating through the opening is formed at one end of the valve needle 338, one end of the valve needle 338 penetrates through the opening, a bushing 336 is arranged inside the valve needle sleeve 337, the bushing 336 comprises an annular base 3361 and a cylindrical portion 3363 arranged on one side of the annular base 3361, the spring 335 is sleeved outside the cylindrical portion 3363 and abuts against the annular base 3361, one end of the valve needle 338 is inserted into the central hole of the bushing 336 to be connected, the valve needle sleeve 337 and the valve core sleeve 332 are in interference press fit, the perforated shaft can guide the lifting and dropping of the valve needle, the insertion shaft and the bushing 336 are in interference press fit, the valve needle sleeve 337 is limited inside the valve core sleeve 332, the valve needle sleeve 338 can be lifted up by the valve needle sleeve 337 when the valve core sleeve 332 is lifted, and the bushing 336 can position the spring 335 at the same time.

As a specific structure of the bushing 336, as shown in fig. 3, the central hole of the bushing 336 includes a guide portion 3365 and a first press-contact portion 3364, the first press-contact portion 3364 is in interference fit with the plug shaft, and the guide portion 3365 can guide the plug shaft when the plug shaft is inserted into the central hole, so as to facilitate interference press-contact with the first press-contact portion 3364. In addition, a first conical surface 3362 is arranged on one side of the annular base 3361, a second conical surface 3371 is arranged at one end of the valve needle sleeve 337, the first conical surface 3362 is in contact with the second conical surface 3371, so that the center guide function is realized, the first conical surface 3362 and the second conical surface 3371 can rotate relatively, and the guide effect is better.

The outer side wall of the valve needle sleeve 337 is provided with a second crimping part 3372, one axial side of the second crimping part 3372 is provided with a limiting boss 3373, the second crimping part 3372 is in interference fit with the inner side wall of the valve core sleeve 332, the limiting boss 3373 abuts against the axial end face of the valve core sleeve 332, the second crimping part 3372 is fixedly connected between the valve needle sleeve 337 and the valve core sleeve 332, and the limiting boss 3373 can limit the installation of the valve needle sleeve 337, so that the installation convenience is improved.

In addition, a conical guide portion 3385 is disposed at the other end of the valve needle 338, a cylindrical transition portion 3381 corresponding to the second flow port 3311 on the sidewall of the valve seat 31 is disposed between the conical guide portion 3385 and the valve needle guide boss 3382, a conical sealing portion 3386 is disposed between the conical guide portion 3385 and the cylindrical transition portion 3381, the conical sealing portion 3386 contacts with the rim of the first flow port 3313, and the conical sealing portion 3386 and the first flow port 3313 realize line contact sealing, so that abrasion can be reduced, and the cylindrical transition portion 3381 corresponds to the second flow port 3311 and does not obstruct the flow between the first flow port 3313 and the second flow port 3311.

The valve seat 31 is provided with at least one balance flow channel 3232 around the valve needle assembly mounting hole 3315, the balance flow channel 3232 communicates the inner cavity of the valve seat 31 with the outside, and the balance flow channel 3232 can enable a fluid medium to fill the whole upper cavity of the valve seat 31, so as to reduce the pressure difference between high pressure and low pressure at the inlet and outlet sides and reduce the action resistance of the valve needle 338. The balance flow channel 3232 comprises a small-diameter section and a large-diameter section which are coaxially arranged, the large-diameter section is communicated with an inner cavity of the valve seat 31, so that fluid media can enter an upper cavity of the valve seat 31, the structure ensures the overall strength of the valve seat, meanwhile, the processing is more convenient, and the processing time and the processing cost are reduced.

In this embodiment, as a specific embodiment of the stator assembly 12, the stator assembly 12 includes a first bobbin 1211, a second bobbin 1212, and a stator housing 121 disposed outside the first bobbin 1211 and the second bobbin 1212, the first bobbin 1211 and the second bobbin 1212 are disposed in an up-and-down arrangement, the first bobbin 1211 and the second bobbin 1212 are respectively wound with a first coil 1221 and a second coil 1222, an electromagnetic pole plate 124 is installed between the first bobbin 1211 and the second bobbin 1212, the electromagnetic pole plate 124 is assembled with the first bobbin 1211 and the second bobbin 1212 through a positioning pin hole, at least two bosses a extend from one side of each of the first bobbin 1211 and the second bobbin 1212, at least one contact pin 123 is vertically disposed on each boss 124a, one end of the contact pin 123 connected with the boss 124a is exposed outside the boss 124a to form a coil, a sleeve 1241 is sleeved on a connecting end of the sleeve 1241, the sleeve 1241 is connected with an end of the first coil 1221 or the first coil 1221, the first coil 1241 and the second coil 1241 need to be connected with different coils 1241, the first coil 1241 and the second coil 1241, the sleeve 1241 and the sleeve 1222 are connected with a coil, the sleeve 1222 is capable of being able to prevent the coil and the coil from being torn off when the sleeve, and the sleeve 1222 is not to be easily, and the sleeve 1222, and the sleeve is able to be adjusted in a certain angle, and the sleeve.

The sleeve 1241 and the pin 123 are in interference fit at the edge of the pin, and the winding outside the sleeve 1241 also has a certain pressure, so that the sleeve 1241 and the pin 123 are more firmly matched and are not easy to fall off. The sleeve 1241 and the pin 123 can slide to a certain extent during assembly, and a certain adjusting space is provided, so that a certain pretightening force is provided between the winding and the sleeve 1241 and the pin 123, and the whole assembly is more compact and coordinated in matching. If the mating strength between the sleeve 1241 and the pin 123 is not sufficient, soldering may also be performed between the sleeve 1241 and the pin. The inner shape of the sleeve 1241 is round, a certain gap exists between the sleeve and the square coil connecting end, and the sleeve can be used for filling soldering flux; this welding step can be performed in synchronization with the welding between the enamel wire and the sleeve 1241, saving processing costs.

First skeleton 1211 and second skeleton 1212 on boss A be the dislocation and set up side by side, dislocation arrangement's boss A makes first skeleton 1211 and second skeleton 1212 form when the assembly and detains certainly, makes the assembly more convenient firm, specifically, boss A including set up two first bosss 1242 in one side of first skeleton 11 side by side to and set up two second bosss 1243 in one side of second skeleton 1212 side by side, first boss 1242 on be provided with first contact pin 1231 and third contact pin 1233 respectively, second boss 1243 on be provided with second contact pin 1232 and fourth contact pin 1234 respectively for the contact pin on first skeleton 1211 and the second skeleton 1212 is alternate arrangement setting, is favorable to the rational utilization in space.

As a connection mode of the contact pins, one end of each of the first contact pin 1231 and the third contact pin 1233 is inserted from the end of the first boss 1242, and extends out from the lower end surface of the first boss 1242 to form a coil connection end, the sleeve 1241 sleeved on the first contact pin 1231 and the third contact pin 1233 is connected to the second coil 1222, one end of each of the second contact pin 1232 and the fourth contact pin 1234 is inserted from the end of the second boss 1243, and extends out from the upper end surface of the second boss 1243 to form a coil connection end, the sleeve 1241 sleeved on the second contact pin 1232 and the fourth contact pin 1234 is connected to the first coil 1221, and the connection between the contact pins and the corresponding coil enameled wires is facilitated through the difference of the structures of the first contact pin 1231 and the third contact pin 1233 and the structures of the second contact pin 1232 and the fourth contact pin 1234.

As a specific embodiment of the magnetic rotor assembly 34, the magnetic rotor assembly 34 includes a magnetic rotor 343, a fixing plate 341 mounted on an upper end of the magnetic rotor 343, and a stop rod 342, the stop rod 342 is located inside the magnetic rotor 343 and is axially disposed along the magnetic rotor 343, one end of the stop rod 342 is eccentrically connected to the fixing plate 341, and the stop rod 342 and the fixing plate 341 are in interference press-fit engagement, and the stop rod 342 is press-fit engagement with the fixing plate 341 without a complicated mounting method. In this embodiment, the edge of the fixing plate 341 and one end of the stop rod 342 are integrally injection-molded with the magnetic rotor 343, the integrated injection-molding process and the interference press-fitting process realize the combination of the machining process and the powder metallurgy process, the qualification rate of the parts is greatly improved and the reject ratio of the parts is reduced by a mature process manufacturing mode, and the press-fitting of the stop rod press-fitting groove 3411 and the press-fitting plate 3421 is favorable for the integrated injection-molding of the magnetic rotor 343. In order to further improve the connection strength between the stopping rod 342 and the fixing plate 341, the stopping rod 342 and the fixing plate 341 are welded after being press-fitted with interference, and the welding may further improve the bonding strength between the stopping rod 342 and the fixing plate 341. In the practical application process, if the press-fitting strength of the stop rod and the fixing plate is enough, welding can be cancelled.

Specifically, a stop rod press-fitting groove 3411 may be formed in an edge of one side of the fixing plate 351, a press-fitting plate 3421 is disposed at one end of the stop rod 342, the press-fitting plate 3421 is inserted into the stop rod press-fitting groove 3411 for interference fit, the stop rod press-fitting groove 3411 and the press-fitting plate 3421 are matched to achieve rapid interference press-fitting between the stop rod and the press-fitting plate 3421, and the press-fitting of the stop rod press-fitting groove 3411 and the press-fitting plate 3421 facilitates the integrated injection molding of the magnetic rotor. Can also be in fixed plate 1 on round its center be provided with a plurality of through-hole, more convenient processing when guaranteeing self intensity reduces process time and cost.

In this embodiment, as a specific embodiment mode of the nut member 32, the nut member 32 includes a nut 321 and a screw 323 located at an axial center of the nut 321, the nut 321 is installed at an opening on an upper side of the valve seat 31, an insert 322 is fixedly disposed on an outer side of the nut 321, the insert 322 is embedded into the opening of the valve seat 31 and is press-fitted with the valve seat 31, the nut 321 is combined with the valve seat through the insert, and the insert 322 is used for realizing press-fitting and firm connection. Concretely, nut 321 links to each other with valve seat 31 from the one end opening side of valve seat 31, and a tip of nut 321 is arranged in the valve pocket, and inserts 322 adopt metalwork or other high strength material to make, can realize being connected with valve seat 31's pressure equipment, and inserts 322 are the platykurtic, and the pressure equipment is convenient, inserts 322 the opening part that is embedded into the valve pocket together with valve seat 31 pressure equipment, nut 321 combines together with valve seat 31 through inserts 322, and the rethread inserts 322 realizes turn-ups riveting dress firm connection.

The insert 322 is annular and is sleeved outside the nut 321, the contact area between the annular insert 322 and the valve seat 31 is large, riveting fixation is facilitated, and an inner hole of the insert 322 can be embedded into the outer side wall of the nut 31. Wherein, inserts 322 and nut 321 can adopt integrative injection moulding, can guarantee the bonding strength between inserts 2 and the nut 1, just wrap up around inserts 322's hole when nut 1 injection moulding, in addition, inserts 322's hole on be provided with a plurality of recess 3222, recess 3222 can fill when inserts 322 and the integrative injection moulding of nut 321, improves the bonding strength between inserts 322 and the nut 321, can't rotate between inserts 322 and the nut 321.

The opening of the valve seat 31 is provided with a press-fitting groove 3134, the insert 322 is embedded into the press-fitting groove 3134, the height of the side wall of the press-fitting groove 3134 is greater than the thickness of the insert 322, a press-fitting part 3131 is formed at a position, higher than the insert 322, of the side wall of the press-fitting groove 3134 to press and fix the insert 322, the press-fitting groove 3134 can position the insert, the press-fitting part 3131 can be pressed and deformed to press the insert 322, and firm connection is guaranteed.

In this embodiment, as a specific embodiment of the nut component 32, the nut component 32 further includes a spring guide rail 324 and a sliding ring 325, the nut 321 includes a base portion 3241 and a cylinder 3242 disposed on one side of the base portion 3241, the spring guide rail 324 is sleeved on an outer side of the cylinder 3242, the sliding ring 325 is sleeved on an outer side of the cylinder 3242 and moves up and down along the cylinder 3242 while rotating around the spring guide rail 324, a stopper portion 3211 is vertically disposed at a lower end of the spring guide rail 324, a stopper groove 3245 is vertically disposed on a sidewall of the base portion 3241, the stopper portion 3211 is embedded in the stopper groove 3245, stopper protrusions 3246 are disposed on two sides of the stopper groove 3245, the stopper protrusion 46 can deform under an external force to cover the stopper groove 3245 to limit the stopper portion 3245 in the stopper groove 3245, when the magnetic component 34 outside the nut component 32 rotates, the stopper rod 32325 on the magnetic component 34 can be shifted to rotate around the spring guide rail 32324, and move to the stopper portion 3245 while the stopper portion 3211 is pressed and the stopper portion 3246 can be removed from the stopper groove, and the magnetic component can be mounted.

The limiting convex part 3246 can be deformed by a hot riveting process, meanwhile, a plain surface 3247 is vertically arranged on the side wall of the base part 3241, the limiting groove 3245 is arranged on the plain surface 3247, the limiting convex part 3246 and the limiting groove 3245 are arranged on the plain surface 3247, the limiting convex part 3246 is conveniently riveted, and the stop part 3211 is conveniently embedded into the limiting groove 3245.

The edge of the insert 322 is provided with a plurality of first vent grooves 3231, the side wall of the base portion 3241 is provided with a second vent groove 3243 corresponding to the first vent groove 3231, the bottom of the valve seat 31 is provided with a balance air passage 3232 communicated with the outside, the balance air passage 3232 enables fluid media to fill the upper cavity of the whole valve seat assembly 3 so as to reduce the pressure difference between high pressure and low pressure at the inlet side and the outlet side, the first vent groove 3231 and the second vent groove 3243 not only can ensure the self-strength of the nut 321 and the insert 322, but also can ensure the balance of air pressure by matching with the balance air passage 3232. Nut 321 outside be provided with spacing step 3112 of round, inserts 322 be located one side of spacing step 3112, spacing step 3112 hug closely with the lateral wall of valve pocket, just second vent groove 3243 sets up on spacing step 3112, and spacing step 3112 can carry out spacingly to inserts 322's axial position, and spacing step 3112 hugs closely with the lateral wall of valve pocket simultaneously and has the guide effect when the pressure equipment. More convenient processing when guaranteeing self intensity reduces process time and cost, reduces the consumptive material, and has strengthened the exhaust performance of whole valve, and the portion of moulding plastics of nut component is apart from more than or equal to 0.3mm with first air channel 3231 on the inserts 322 to guarantee that the portion of moulding plastics seals glue and intensity, ensure the logical in the same direction as in air channel.

When the electronic expansion valve starts to work, the liquid high-pressure fluid medium is throttled by the valve port, so that the pressure of the high-pressure fluid medium is reduced, the high-pressure fluid medium is changed into a gas-liquid mixed fluid medium, and heat is released at the same time. The temperature-pressure sensor at the outlet end can input the collected temperature signal and pressure signal into the controller, the controller outputs the signal to the electronic expansion valve after calculation according to the related control program, LIN communication is completed through the circuit board 16, high-precision stable adjustment of current in a winding coil in the stator assembly 12 is realized, so that the stator assembly 12 is controlled to generate a changed excitation magnetic field, the magnetic rotor component 34 rotates under the action of the excitation magnetic field, the screw rod assembly 335 is driven to move, the valve needle is further driven to move, the opening change of a valve port of the electronic expansion valve is realized, and the purpose of adjusting the flow and the pressure of a fluid medium is further achieved.

It should be noted that all directional indicators (such as up, down, left, right, front, and back) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless expressly specified otherwise.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.

Claims (10)

1. An electronic expansion valve with a circuit board, comprising:

the stator assembly (1) and the valve seat assembly (3), wherein the valve seat assembly (3) is arranged on one side of the stator assembly (1);

the stator assembly (1) comprises a shell (11) and a stator assembly (12) arranged in the shell (11), a control installation cavity (14) located on the upper side of the stator assembly (12) is arranged on the upper portion of the shell (11), a circuit board (16) is installed in the control installation cavity (14), the stator assembly (12) is connected with the circuit board (16) through a conductive contact pin (114) on one side of the stator assembly, a socket (17) is arranged on the side portion of the shell (11), the socket (17) is vertically arranged upwards, and the socket (17) is connected with the circuit board (16) through a switching contact pin piece;

the valve seat assembly (3) comprises a valve seat (31), a nut component (32) located on the upper side of the valve seat (31) and a valve needle component (33) located in the valve seat (31), the nut component (32) is located in a magnetic rotor component (34), the magnetic rotor component (34) is located inside a magnetic isolation pipe (35), the magnetic isolation pipe (35) is located inside a stator component (12), a first flow valve port (3313) is formed in the bottom of the valve seat (31), the nut component (32) moves axially under the driving of the magnetic rotor component (34), the valve needle component (33) is driven to move axially, and the first flow valve port (3313) is blocked and opened.

2. The electronic expansion valve with circuit board of claim 1, wherein: the valve needle component (33) is coaxially arranged inside the valve seat (31), the valve needle component (33) comprises a valve core sleeve (332) and a valve needle (338), the valve needle (338) is arranged at a first end of the valve core sleeve (332) and is inserted into a first flow-through valve port (3313) at the bottom of the valve seat (31), a second end of the valve core sleeve (332) is connected with one end of a screw rod (323) in the nut component (32), a spring (335) is arranged inside the valve core sleeve (332), and one end of the spring (335) is axially connected with one end of the valve needle (338); a valve needle assembly mounting hole (3315) is axially formed in the valve seat (31), a valve needle guide part (3314) is arranged in the valve needle assembly mounting hole (3315), a valve needle guide boss (3382) is arranged outside the valve needle (338), and the valve needle guide boss (3382) is tightly attached to the valve needle guide part (3314).

3. The electronic expansion valve with circuit board of claim 2, wherein: the valve core sleeve (332) is provided with a valve needle sleeve (337) at one end corresponding to the valve needle (338), the middle of the valve needle sleeve (337) is provided with an opening, one end of the valve needle (338) penetrates through the opening, a lining (336) is arranged on the inner side of the valve needle sleeve (337), the lining (336) comprises an annular base (3361) and a cylindrical part (3363) arranged on one side of the annular base (3361), the spring (335) is sleeved on the outer side of the cylindrical part (3363) and abuts against the annular base (3361), and one end of the valve needle (338) is inserted into a central hole of the lining (336) to be connected.

4. The electronic expansion valve with circuit board of claim 1, wherein: the stator assembly (12) comprises a first framework (1211) and a second framework (1212), the first framework (1211) and the second framework (1212) are arranged up and down, a first coil (1221) and a second coil (1222) are respectively wound on the first framework (1211) and the second framework (1212), at least two bosses (A) extend out of one side of the first framework (1211) and one side of the second framework (1212), at least one contact pin (123) is vertically arranged on each boss (A), one end portion of each contact pin (123) connected with the corresponding boss (A) is exposed outside the corresponding boss (A) to form a coil connecting end, a sleeve (1241) is sleeved on the coil connecting end, and the sleeve (1241) is connected with the end portion of the first coil (1221) or the end portion of the second coil (1222).

5. The electronic expansion valve with circuit board of claim 1, wherein: the magnetic rotor assembly (34) comprises a magnetic rotor (343), a fixing plate (341) mounted at the upper end of the magnetic rotor (343), and a stop rod (342), wherein the stop rod (342) is located inside the magnetic rotor (343) and axially arranged along the magnetic rotor (343), one end of the stop rod (342) is eccentrically connected with the fixing plate (341), the stop rod (342) and the fixing plate (341) are in interference press fit, a stop rod press-fit groove (3411) is formed in one side edge of the fixing plate (341), a press-fit plate (3421) is arranged at one end of the stop rod (342), and the press-fit plate (3421) is embedded into the stop rod press-fit groove (3411) for interference fit.

6. The electronic expansion valve with circuit board of claim 1, wherein: nut part (32) include nut (321) and be located screw rod (323) of nut (321) axial direction center, nut (321) install the opening part of valve seat (31) upside, the outside of nut (321) fixed be provided with inserts (322), inserts (322) the opening part of embedding valve seat (31) together with valve seat (31) pressure equipment, the edge of inserts (322) be provided with a plurality of first air channel (3231), the lateral wall of nut (321) on be provided with second air channel (3243) that correspond with first air channel (3231), the bottom of valve seat (31) be provided with the outside balanced air flue (3232) of intercommunication.

7. The electronic expansion valve with circuit board of claim 6, wherein: the opening of the valve seat (31) is provided with a press-fitting groove (3134), the insert (322) is embedded into the press-fitting groove (3134), the height of the side wall of the press-fitting groove (3134) is larger than the thickness of the insert (322), and a part of the side wall of the press-fitting groove (3134) which is higher than the insert (322) forms a pressing edge part (3131) to press and fix the insert (322).

8. The electronic expansion valve with circuit board of claim 6, wherein: the nut component (32) further comprises a spring guide rail (324) and a sliding ring (325), the nut (321) comprises a base portion (3241) and a cylinder (3242) arranged on one side of the base portion (3241), the spring guide rail (324) is sleeved on the outer side of the cylinder (3242), the sliding ring (325) is sleeved on the outer side of the cylinder (3242) and rotates around the spring guide rail (324) and lifts along the cylinder (3242), a stopping portion (3211) is vertically arranged at the lower end of the spring guide rail (324), a limiting groove (3245) is vertically arranged on the side wall of the base portion (3241), the stopping portion (3211) is embedded into the limiting groove (3245), limiting convex portions (3246) are arranged on two sides of the limiting groove (3245), and the limiting convex portions (3246) can deform under external force to cover the limiting groove (3245) to limit the stopping portion (3211) in the limiting groove (3245).

9. The electronic expansion valve with circuit board of claim 1, wherein: the middle part of control installation cavity (14) be provided with bellying (13), the inside valve body installation cavity (115) that runs through stator module (12) that form of bellying (13), the middle part of circuit board (16) open and to have the through-hole, bellying (13) follow pass in the through-hole.

10. The electronic expansion valve with circuit board of claim 1, wherein: the bottom of control installation cavity (14) be provided with a plurality of support protruding muscle (113) for support circuit board (16), support protruding muscle (113) on be provided with a plurality of opening reference column (112), opening reference column (112) insert circuit board (16) on the corresponding locating hole in fix a position circuit board (16).

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