Electronic expansion valve

Abstract

The utility model provides an electronic expansion valve. The electronic expansion valve comprises a sleeve, a valve element and a valve element, the rotor assembly is arranged on the inner side of the sleeve and comprises a first magnetic rotor, a second magnetic rotor and a speed increasing mechanism, the first magnetic rotor is used for driving the valve needle to rotate, the first magnetic rotor is in driving connection with the speed increasing mechanism, the speed increasing mechanism is in driving connection with the second magnetic rotor, and the rotating speed of the first magnetic rotor is smaller than that of the second magnetic rotor; and the sensor is arranged on the outer side of the sleeve and is used for detecting the rotation angle of the second magnetic rotor. According to the technical scheme, the problem that in the prior art, a Hall sensor is low in sensing precision can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic expansion valve technical field, specifically, electronic expansion valve. BACKGROUND

[0002] In prior art, electronic expansion valve usually has rotor and valve needle, rotor and valve needle are fixedly connected, rotor is driven by electromagnetic coil to drive valve needle to rotate and relatively valve port to move for flow regulation.

[0003] However, in the cooperation process of rotor and hall inductor, the induction effect is poor when rotor cooperates with hall inductor because the rotation speed of rotor is slow, the sensing precision of hall inductor is low when monitoring work such as locked-rotor judgment or forward-reverse rotation judgment, which will affect the monitoring accuracy of electronic expansion valve operating state. UTILITY MODEL CONTENTS

[0004] The utility model provides an electronic expansion valve to solve the problem of low sensing precision of hall inductor in prior art.

[0005] The utility model provides an electronic expansion valve, electronic expansion valve includes: sleeve, rotor assembly, rotor assembly sets up inside the sleeve, rotor assembly includes first magnetic rotor, second magnetic rotor and speed increasing mechanism, first magnetic rotor is used for driving valve needle to rotate, first magnetic rotor is drivenly connected with speed increasing mechanism, speed increasing mechanism is drivenly connected with second magnetic rotor, the rotation speed of first magnetic rotor is less than the rotation speed of second magnetic rotor, sensor, set up outside the sleeve, sensor is used for detecting the rotation angle of second magnetic rotor.

[0006] Further, the speed increasing mechanism includes a transmission wheel set, the input end of the transmission wheel set is connected with the first magnetic rotor, the output end of the transmission wheel set is connected with the second magnetic rotor, and the transmission ratio of the transmission wheel set is less than 1.

[0007] Further, the transmission wheel set includes a sun gear and a planet wheel, the planet wheel is engaged with the sun gear, the first magnetic rotor is drivingly connected with the planet wheel to drive the planet wheel to rotate, and the sun gear is fixedly connected with the second magnetic rotor to drive the second magnetic rotor to rotate synchronously with the sun gear.

[0008] Further, the transmission wheel set further includes an internal gear structure and a planet carrier, the planet carrier is fixedly arranged in the sleeve, the planet wheel is rotatably arranged on the planet carrier and located on the side of the planet carrier close to the first magnetic rotor, the internal gear structure is arranged on the first magnetic rotor and engaged with the planet wheel, and the first magnetic rotor can drive the planet wheel to rotate around the axis of the planet wheel through the internal gear structure.

[0009] Further, the first magnetic rotor has a first driving section and a second driving section connected in sequence, an inner wall of the first driving section is provided with an internal gear structure, the second driving section is drivingly connected with the valve needle, and the first driving section is integrally formed with the second driving section.

[0010] Further, the speed increasing mechanism further comprises a first ring gear, an inner wall of the first ring gear is provided with an internal gear structure, and the first ring gear is fixedly connected with the first magnetic rotor.

[0011] Further, a plurality of planetary gears are arranged, the plurality of planetary gears are annularly and spacedly arranged around the outer periphery of the sun gear, the carrier is provided with a first mounting hole, the first mounting hole is provided with a first connecting shaft, the plurality of first mounting holes and the plurality of first connecting shafts are respectively and correspondingly arranged with the plurality of planetary gears, and the planetary gears are mounted on the first connecting shafts.

[0012] Further, the planetary gear has a first connecting hole, the first connecting shaft is arranged in the first connecting hole and fixedly connected with the carrier, and the first connecting shaft and the first connecting hole are in clearance fit; or, the planetary gear has a first connecting hole, the first connecting shaft is arranged in the first connecting hole and fixedly connected with the planetary gear, and the first connecting shaft and the carrier are in clearance fit.

[0013] Further, the sun gear has an engaging portion and a connecting portion, the engaging portion is used for engaging with the planetary gear, and the connecting portion is used for connecting the second magnetic rotor, the carrier is provided with a first through hole, the connecting portion is arranged in the first through hole, and the connecting portion and the first through hole are in clearance fit.

[0014] Further, the carrier is welded or riveted with the sleeve.

[0015] Further, the first magnetic rotor comprises a first body and a first rotor connecting plate, the first body is fixedly connected with the first rotor connecting plate, the first rotor connecting plate is located on a side of the planetary gear close to the first body, the speed increasing mechanism further comprises an internal gear structure, the internal gear structure is fixedly arranged in the sleeve and engaged with the planetary gear, the planetary gear is rotatably arranged on the first rotor connecting plate, and the first magnetic rotor can drive the planetary gear to rotate around the axis of the planetary gear and revolve around the sun gear through the first rotor connecting plate.

[0016] Further, a plurality of planetary gears are arranged, the plurality of planetary gears are annularly and spacedly arranged around the outer periphery of the sun gear, the first rotor connecting plate is provided with a second mounting hole, the second mounting hole is provided with a second connecting shaft, the plurality of second mounting holes and the plurality of second connecting shafts are respectively and correspondingly arranged with the plurality of planetary gears, and the planetary gears are mounted on the second connecting shafts.

[0017] Further, the second connecting shaft is in clearance fit with the second mounting hole, and the planet wheel is in fixed connection with the second connecting shaft; or the second connecting shaft is in fixed fit with the second mounting hole, and the planet wheel is in clearance fit with the second connecting shaft.

[0018] Further, the speed increasing mechanism further comprises a second ring gear, which is fixedly arranged in the sleeve, and an inner gear structure is arranged on an inner wall of the second ring gear.

[0019] Further, the sun gear has an engaging portion and a connecting portion, the engaging portion is used for engaging with the planet wheel, and the connecting portion is used for connecting the second magnetic rotor, an end portion of the second ring gear away from the first magnetic rotor is provided with an end plate, the end plate is provided with a second through hole, the connecting portion is arranged in the second through hole, and the connecting portion is in clearance fit with the second through hole.

[0020] Further, the second magnetic rotor comprises a second body and a second rotor connecting plate, the second body is arranged at an outer periphery of the second rotor connecting plate, and the end portion of the sun gear is fixedly connected with the second rotor connecting plate.

[0021] Further, the second body and the second rotor connecting plate are integrally formed.

[0022] Further, an end portion of the second rotor connecting plate away from the sun gear is provided with a protruding portion, and the protruding portion is used for abutting against an inner wall of an end portion of the sleeve.

[0023] Further, the sensor comprises one Hall sensor or two Hall sensors, and in the case that the sensor comprises two Hall sensors, the phase difference between the two Hall sensors is 90 degrees.

[0024] Further, a transmission ratio of the transmission wheel set is N x (A / B x C / 2), wherein N is a positive integer, A is the pole pair number of the first magnetic rotor, B is the pole pair number of the second magnetic rotor, and C is the driving beat number of driving and controlling the pair of magnetic poles.

[0025] According to the technical scheme of the utility model, in the process that the first magnetic rotor of the electronic expansion valve drives the valve needle to rotate, the second magnetic rotor can be driven to rotate simultaneously by the speed increasing mechanism, so that the rotation speed of the second magnetic rotor is indirectly improved by the speed increasing mechanism, when the first magnetic rotor rotates through an angle, the second magnetic rotor is accelerated to rotate through a larger angle by the speed increasing mechanism, the sensor can make multiple judgments on the detection of the second magnetic rotor in unit time, the probability that the sensor cannot accurately detect due to the slow rotation of the first magnetic rotor is reduced, and compared with directly detecting the rotation angle of the first magnetic rotor, the accuracy of the sensor in detecting the state of the valve needle can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings accompanying the specification provide further understanding of the present application, serve as an example of the embodiments of the present application, and explain the present application, and do not constitute an improper limitation to the present application. In the drawings:

[0027] Figure 1 A structure schematic view of the electronic expansion valve provided by the first embodiment of the present application is shown;

[0028] Figure 2 A structure schematic view of the electronic expansion valve provided by the second embodiment of the present application is shown;

[0029] Figure 3 A partial sectional view of the electronic expansion valve provided by the first embodiment of the present application is shown;

[0030] Figure 4 A structure schematic view of the first magnetic rotor provided by the first embodiment of the present application is shown;

[0031] Figure 5 A partial structure schematic view of the planetary gear cooperating with the planet carrier provided by the first embodiment of the present application is shown;

[0032] Figure 6 A structure schematic view of the sun gear cooperating with the second magnetic rotor provided by the present application is shown;

[0033] Figure 7 A partial sectional view of the electronic expansion valve provided by the second embodiment of the present application is shown;

[0034] Figure 8 A partial structure schematic view of the planetary gear cooperating with the second rotor connecting plate provided by the second embodiment of the present application is shown;

[0035] Figure 9 A structure schematic view of the second gear ring provided by the second embodiment of the present application is shown.

[0036] Among the above drawings, the following reference signs are included:

[0037] 100, sleeve;

[0038] 200, first magnetic rotor; 201, first driving section; 202, second driving section; 210, first body; 220, first rotor connecting plate;

[0039] 300, second magnetic rotor; 310, second body; 320, second rotor connecting plate; 321, protruding part;

[0040] 400, speed increasing mechanism;

[0041] 410, sun gear; 411, meshing part; 412, connecting part; 413, limiting shaft hole;

[0042] 420, planetary gear;

[0043] 421, first connecting shaft; 4211, first connecting section; 4212, first extension section; 4213, first stop section;

[0044] 422, second connecting shaft; 4221, second connecting section; 4222, second extension section; 4223, limiting boss;

[0045] 430, planet carrier;

[0046] 440, second ring gear; 441, end plate; 4411, second through hole;

[0047] 500, valve needle;

[0048] 600, sensor. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0050] As shown in Figure 1 and Figure 2 The present application provides an electronic expansion valve, which comprises a sleeve 100, a rotor assembly and a sensor 600. The rotor assembly is arranged inside the sleeve 100, and comprises a first magnetic rotor 200, a second magnetic rotor 300 and a speed increasing mechanism 400. The first magnetic rotor 200 is used to drive the valve needle 500 to rotate, and is drivingly connected with the speed increasing mechanism 400. The speed increasing mechanism 400 is drivingly connected with the second magnetic rotor 300, and the rotation speed of the first magnetic rotor 200 is less than that of the second magnetic rotor 300. The sensor 600 is arranged outside the sleeve 100, and is used to detect the rotation angle of the second magnetic rotor 300.

[0051] The technical scheme of the utility model, the first magnetic rotor 200 of the electronic expansion valve can drive the second magnetic rotor 300 to rotate simultaneously through the speed increasing mechanism 400 in the process of driving the valve needle 500 to rotate, so as to improve the rotating speed of the second magnetic rotor 300 indirectly through the speed increasing mechanism 400, when the first magnetic rotor 200 rotates through an angle, the second magnetic rotor 300 is accelerated to rotate through a larger angle by the speed increasing mechanism 400, the sensor 600 can judge the detection of the second magnetic rotor 300 for multiple times in a unit time, the probability of inaccurate detection of the sensor 600 caused by the slow rotation of the first magnetic rotor 200 is reduced, compared with directly detecting the rotating angle of the first magnetic rotor 200, the accuracy of the sensor 600 in detecting the state of the valve needle 500 can be improved.

[0052] In some embodiments of the application, the sensor 600 includes a Hall sensor.

[0053] In some embodiments of the application, the sensor 600 includes two Hall sensors, and the phase difference between the two Hall sensors is 90°.

[0054] Specifically, the speed increasing mechanism 400 includes a transmission gear set, the input end of the transmission gear set is connected with the first magnetic rotor 200, the output end of the transmission gear set is connected with the second magnetic rotor 300, and the transmission ratio of the transmission gear set is less than 1. Through the above setting, the transmission gear set can form a speed increasing gear set to amplify the rotating speed of the first magnetic rotor 200, so that the second magnetic rotor 300 rotates at a higher rotating speed, so that the rotating speed of the second magnetic rotor 300 after speed increasing can be matched with the sensitivity of the Hall sensor, so as to improve the sensing accuracy of the Hall sensor. Further, the problem of low sensing accuracy of the Hall sensor caused by the slow rotating speed of the transmission rotor of the electronic expansion valve is solved.

[0055] Specifically, the transmission gear set includes a sun gear 410 and a planetary gear 420, the planetary gear 420 is engaged with the sun gear 410, the first magnetic rotor 200 is drivingly connected with the planetary gear 420 to drive multiple planetary gears 420 to rotate, and the sun gear 410 is fixedly connected with the second magnetic rotor 300 to drive the second magnetic rotor 300 to rotate synchronously with the sun gear 410. By setting the transmission gear set as a planetary gear set matched with the sun gear 410 and the planetary gear 420, the power and the torque can be stably transmitted, and the structure of the planetary gear set is compact, so that efficient transmission can be realized in the limited axial dimension of the sleeve 100. This design not only saves space, but also improves the transmission efficiency.

[0056] Referring to Figure 1 , Figures 3 to 5As shown, in the first embodiment of the present application, the transmission wheel set further comprises an internal gear structure and a planet carrier 430, the planet carrier 430 is fixedly arranged in the sleeve 100, the planet carrier 430 is located between the first magnetic rotor 200 and the second magnetic rotor 300, the planet wheel 420 is rotatably arranged on the planet carrier 430 and located on the side of the planet carrier 430 close to the first magnetic rotor 200, the internal gear structure is arranged on the first magnetic rotor 200 and meshes with the planet wheel 420, and the first magnetic rotor 200 can drive the planet wheel 420 to rotate around the axis of the planet wheel 420 through the internal gear structure. Through the above arrangement, when the first magnetic rotor 200 rotates, the power output of the internal gear structure can be output to the planet wheel 420, because the planet wheel 420 is fixed on the fixedly arranged planet carrier 430, the planet wheel 420 will produce rotation and drive the sun gear 410 to rotate, so as to accelerate the second magnetic rotor 300.

[0057] In some embodiments of the present application, as shown, Figure 4 The first magnetic rotor 200 has a first driving section 201 and a second driving section 202 connected in sequence, the internal gear structure is arranged on the inner wall of the first driving section 201, the second driving section 202 is drivingly connected with the valve needle 500, and the first driving section 201 and the second driving section 202 are integrally formed. In this way, the overall structural performance of the first magnetic rotor 200 can be improved, the first magnetic rotor 200 is easy to process and form, and the production efficiency of the parts is improved.

[0058] Specifically, the integrally forming process of the first magnetic rotor 200 can be selected as integrally injection molding.

[0059] Optionally, in still some embodiments of the present application, the speed increasing mechanism 400 further comprises a first gear ring, the internal gear structure is arranged on the inner wall of the first gear ring, and the first gear ring is fixedly connected with the first magnetic rotor 200. Through the above arrangement, the machining accuracy of the first gear ring can be ensured during machining, the transmission gap of the planet wheel set can be reduced, and the accuracy of transmission can be ensured.

[0060] Further, the planet wheel 420 is provided in plurality, the plurality of planet wheels 420 are annularly and spacedly arranged around the outer periphery of the sun gear 410, the planet carrier 430 is provided with a first mounting hole, the first mounting hole is provided in plurality, a first connecting shaft 421 is arranged in the first mounting hole, the plurality of first mounting holes, the plurality of first connecting shafts 421 and the plurality of planet wheels 420 are arranged one by one in correspondence, and the planet wheel 420 is mounted on the first connecting shaft 421. Through the above arrangement, the plurality of planet wheels 420 are arranged, so as to ensure the stability of the rotation of the transmission wheel set. Specifically, the planet wheel 420 can be provided in three, four or five.

[0061] In the present application, the planet wheel 420 has a first connecting hole, the first connecting shaft 421 is arranged in the first connecting hole and fixedly connected with the planet carrier 430, the first connecting shaft 421 is in clearance fit with the first connecting hole, or the planet wheel 420 has a first connecting hole, the first connecting shaft 421 is arranged in the first connecting hole and fixedly connected with the planet wheel 420, and the first connecting shaft 421 is in clearance fit with the planet carrier 430. Through the above arrangement, the rotation effect of the planet wheel 420 can be ensured, the internal friction of the speed increasing wheel set is reduced, and then the torque loss is reduced, and the output efficiency of the speed increasing wheel set is ensured.

[0062] It can be understood that, in the first embodiment of the present application, the clearance fit means that the inner diameter of the first connecting hole is slightly larger than the diameter of the first connecting shaft 421.

[0063] Referring to FIG. 1, Figure 5 The first connecting shaft 421 has a first connecting section 4211, a first extending section 4212 and a first stop section 4213 connected in sequence and arranged in steps, the diameter of the first connecting section 4211 is smaller than the diameter of the first extending section 4212, the first connecting section 4211 is used for fixedly connecting with the planet carrier 430 to fix the first connecting shaft 421 on the planet carrier 430, the diameter of the first extending section 4212 is smaller than the diameter of the first stop section 4213, the shape of the first mounting hole is matched with the shape of the first extending section 4212 and the first stop section 4213, that is, the first mounting hole also has a stepped hole section connected in sequence, and the stepped surface between the first extending section 4212 and the first stop section 4213 is matched with the inner wall of the first connecting hole to support the planet wheel 420 to limit the displacement of the planet wheel 420 in the axial direction.

[0064] Similarly, referring to FIG. 1, Figure 6 The sun gear 410 has an engaging portion 411 and a connecting portion 412, the engaging portion 411 is used for engaging with the planet wheel 420, and the connecting portion 412 is used for connecting the second magnetic rotor 300. The planet carrier 430 is provided with a first through hole, and the connecting portion 412 is arranged in the first through hole and in clearance fit with the first through hole. Through the above arrangement, the friction between the sun gear 410 and the planet carrier 430 can be reduced, the friction loss of the torque of the sun gear 410 can be reduced, and the transmission efficiency of the speed increasing wheel set can be ensured.

[0065] Optionally, the planet carrier 430 is welded or riveted with the sleeve 100 to ensure the stability of the planet carrier 430 fixed in the sleeve 100, prevent the planet carrier 430 from rotating, and ensure the system stability of the speed increasing wheel set.

[0066] Referring to FIG. 1, Figures 7 to 9As shown, in the second embodiment of the present application, the first magnetic rotor 200 comprises a first body 210 and a first rotor connecting plate 220, the first body 210 is fixedly connected with the first rotor connecting plate 220, the first rotor connecting plate 220 is located on the side of the planetary gear 420 close to the first body 210, the speed increasing mechanism 400 further comprises an internal gear structure, the internal gear structure is fixedly arranged in the sleeve 100 and engaged with the planetary gear 420, the planetary gear 420 is rotatably arranged on the first rotor connecting plate 220, and the first magnetic rotor 200 can drive the planetary gear 420 to rotate around the axis of the planetary gear 420 and revolve around the sun gear 410 through the first rotor connecting plate 220. Through the above arrangement, when the first magnetic rotor 200 rotates, it can drive the first rotor connecting plate 220 to rotate, and when the first rotor connecting plate 220 rotates, it can drive the planetary gear 420 to revolve around the sun gear 410, and when the planetary gear 420 rotates, it will rotate itself and drive the sun gear 410 to rotate, so as to accelerate the second magnetic rotor 300.

[0067] Specifically, the first rotor connecting plate 220 is fixedly connected with the valve needle 500, and the first rotor connecting plate 220 drives the valve needle 500 to rotate when the planetary gear 420 rotates, so as to realize the function of electronic expansion valve flow adjustment.

[0068] Further, the planetary gear 420 is provided in plurality, the plurality of planetary gears 420 are annularly and spacedly arranged around the outer periphery of the sun gear 410, the first rotor connecting plate 220 is provided with a second mounting hole, the second mounting hole is correspondingly provided with plurality, a second connecting shaft 422 is arranged in the second mounting hole, the plurality of second mounting holes, the plurality of second connecting shafts 422 and the plurality of planetary gears 420 are one-to-one correspondingly arranged, and the planetary gear 420 is mounted on the second connecting shaft 422. In this way, the plurality of planetary gears 420 are arranged, which can ensure the stability of the transmission gear set rotation. Specifically, the planetary gear 420 can be provided with 3, 4 or 5.

[0069] Specifically, the second connecting shaft 422 is in clearance fit with the second mounting hole, and the planetary gear 420 is fixedly connected with the second connecting shaft 422; or, the second connecting shaft 422 is in fixed fit with the second mounting hole, and the planetary gear 420 is in clearance fit with the second connecting shaft 422. Through the above arrangement, the rotation effect of the planetary gear 420 can be ensured, the internal friction of the speed increasing gear set is reduced, the torque loss is further reduced, and the output efficiency of the speed increasing gear set is ensured.

[0070] It can be understood that, in the second embodiment of the present application, the clearance fit means that the inner diameter of the second mounting hole is slightly larger than the diameter of the second connecting shaft 422.

[0071] Reference Figure 8As shown, the second connecting shaft 422 has a second connecting section 4221 and a second extending section 4222 connected with each other, the outer side wall of the second extending section 4222 is provided with a limiting boss 4223, the diameter of the second connecting section 4221 is smaller than that of the second extending section 4222, the diameter of the second extending section 4222 is smaller than that of the limiting boss 4223, the planetary gear 420 is sleeved on the second extending section 4222 and located at the side of the limiting boss 4223 away from the first rotor connecting plate 220, the planetary gear 420 is in clearance fit with the second extending section 4222, and the limiting boss 4223 is used for supporting the planetary gear 420 to limit the displacement of the planetary gear 420 towards the side of the first rotor connecting plate 220.

[0072] With reference to Figure 9 As shown, the speed increasing mechanism 400 further comprises a second ring gear 440 fixedly arranged in the sleeve 100, and the inner wall of the second ring gear 440 is provided with an internal gear structure. By fixing the second ring gear 440 in the sleeve 100, the second ring gear 440 can be matched with the planetary gear 420 to drive the sun gear 410 to rotate at a high speed.

[0073] Specifically, the second ring gear 440 is welded or riveted with the sleeve 100 to ensure the stability of the second ring gear 440 fixed in the sleeve 100, prevent the second ring gear 440 from rotating, and ensure the system stability of the speed increasing gear set.

[0074] Further, in the second embodiment of the present application, the connecting part 412 of the sun gear 410 is used for connecting the second magnetic rotor 300, the end part of the second ring gear 440 away from the first magnetic rotor 200 is provided with an end plate 441, the end plate 441 is provided with a second through hole 4411, the connecting part 412 is arranged in the second through hole 4411, and the connecting part 412 is in clearance fit with the second through hole 4411. Through the above arrangement, the stability of the sun gear 410 rotating can be ensured, the friction between the sun gear 410 and the second ring gear 440 can be reduced, the friction loss of the torque of the sun gear 410 can be reduced, and the transmission efficiency of the speed increasing gear set can be ensured.

[0075] Specifically, in the present application, with reference to Figure 6 As shown, the second magnetic rotor 300 comprises a second body 310 and a second rotor connecting plate 320, the second body 310 is arranged at the outer periphery of the second rotor connecting plate 320, the end part of the sun gear 410 forms an output end of the speed increasing gear set and is fixedly connected with the second rotor connecting plate 320. Through the above arrangement, the second body 310 can be fixedly connected with the speed increasing gear set through the second rotor connecting plate 320 to realize synchronous rotation with the first magnetic rotor 200.

[0076] Further, the second body 310 and the second rotor connecting plate 320 are integrally formed. In this way, the overall structural performance of the second magnetic rotor 300 can be improved, and the second magnetic rotor 300 is convenient to process and form, thereby improving the production efficiency of the parts.

[0077] Specifically, the integrally formed process of the second magnetic rotor 300 can be selected as integrally injection molding.

[0078] In some optional embodiments of the present application, the end of the second rotor connecting plate 320 away from the sun gear 410 is provided with a protruding portion 321, and the protruding portion 321 is used to abut against the inner wall of the end of the sleeve 100. In this way, the protruding portion 321 on the second rotor connecting plate 320 can limit the displacement of the second magnetic rotor 300 and the speed increasing gear set in the sleeve 100, support the second magnetic rotor 300 and the speed increasing gear set in the sleeve 100 as a whole, and reduce the frictional resistance between the second rotor connecting plate 320 and the sleeve 100, prevent the rotation speed of the second magnetic rotor 300 from being reduced due to the frictional resistance, and ensure the speed increasing effect of the speed increasing gear set.

[0079] Further, the side of the second rotor connecting plate 320 close to the connecting portion 412 can be provided with a mounting boss, which can be used for limiting cooperation with the planet carrier 430 in the first embodiment of the present application or the end plate 441 in the second embodiment of the present application, so as to limit the displacement of the second magnetic rotor 300 to the first magnetic rotor 200. At the same time, the frictional resistance between the second rotor connecting plate 320 and the planet carrier 430 or the frictional resistance between the second rotor connecting plate 320 and the second gear ring 440 can be reduced, and the speed increasing effect of the speed increasing gear set can be ensured.

[0080] Specifically, the sun gear 410 is also provided with a limiting shaft hole 413, and the valve needle 500 is partially inserted into the limiting shaft hole 413. In this way, the rotation axis of the sun gear 410 can be limited by the valve needle 500, the deflection of the sun gear 410 can be prevented, the stability of the rotation of the speed increasing gear set can be ensured, and the space required for the installation of the speed increasing gear set in the sleeve 100 can be further reduced, which is conducive to the miniaturization of the electronic expansion valve.

[0081] The transmission ratio of the transmission gear set provided in the present application is N×(A / B×C / 2), wherein N is a positive integer, A is the pole pair number of the first magnetic rotor 200, B is the pole pair number of the second magnetic rotor 300, and C is the driving beat number of the driving control rotation of a pair of magnetic poles. In order to realize accurate pulse feedback, the minimum transmission ratio of the transmission gear set needs to be i=A / B×C / 2, at this time N=1, and N can also be set as a positive integer such as 2, 3 or 4 according to different feedback needs.

[0082] According to another aspect of the present application, a control method applied to the above-mentioned electronic expansion valve is provided, and the control method comprises:

[0083] Step 1, according to 1 pulse signal input to the first magnetic rotor 200, the theoretical pulse number of the second magnetic rotor 300 is obtained; the theoretical pulse number of the second magnetic rotor 300 corresponding to 1 pulse signal input to the first magnetic rotor 200 is obtained;

[0084] Step 2, 1 pulse signal is input to the first magnetic rotor 200, and the actual pulse number of the second magnetic rotor 300 is obtained through the sensor;

[0085] Step 3, according to the actual pulse number and the theoretical pulse number, the actual running state of the current first magnetic rotor 200 is judged.

[0086] By applying the control method provided in the present application, a more accurate pulse signal can be fed back from the second magnetic rotor 300, the running state of the electronic expansion valve can be accurately judged, and based on the design transmission ratio N x i of the planetary gear set, the control software can accurately judge the pulse number through the Hall waveform fed back by the second magnetic rotor 300. In theory, when 1 pulse signal is input to the first magnetic rotor, the Hall inductor changes N times of electrode change, so the theoretical pulse number of the second magnetic rotor 300 can be obtained. When 1 pulse signal is actually input to the first magnetic rotor, the actual number of electrode changes of the Hall inductor is compared with N, and it can be judged whether the actual position of the valve has run 1 pulse, so as to judge the actual running state of the electronic expansion valve and improve the controllability of the electronic expansion valve.

[0087] Specifically, the actual running state includes a stop state, which is the actual position of the valve needle 500 of the electronic expansion valve when moving to the upper limit position and the lower limit position. At this time, the electronic expansion valve is in a 0 pulse position of full opening state or full closing state. After the electronic expansion valve is in the stop state, the first magnetic rotor 200 will still rotate slightly due to the step control of the electronic expansion valve. At this time, 1 pulse signal is input to the first magnetic rotor 200, and the actual pulse number of the second magnetic rotor 300 obtained will have multiple steps. When the sensor includes 1 Hall inductor, the actual pulse number is multiple pulse numbers, and the feedback signal is multiple steps. When the sensor includes 2 Hall inductors, the feedback signal of the multiple actual pulse numbers is reverse multiple steps due to the 90° phase difference between the 2 Hall inductors. Because the actual pulse number will deviate due to the gear gap and material elasticity of the transmission gear set, when the actual pulse number is within a preset range, it is judged that the electronic expansion valve is in the stop state, and the current actual pulse number is recorded as the step number of multiple pulses, so as to determine the actual 0 pulse position, or the position after inputting multiple pulse numbers to the first magnetic rotor 200 is recorded as the 0 pulse position, and it is judged that the electronic expansion valve is in the stop state.

[0088] In the above control method, the number of pulses is determined according to the number of magnetic poles of the first magnetic rotor 200, which can be 3, 5, or 7, etc.

[0089] Further, the preset range is 2N-10N, and N is a positive integer in the transmission ratio of the transmission wheel set.

[0090] Further, the preset range is 2N-10N, and N is a positive integer in the transmission ratio of the transmission wheel set.

[0091] Specifically, the actual running state also includes a step-out state. During the operation of the electronic expansion valve, the first magnetic rotor 200 may not rotate according to the preset angle due to the load and other reasons, and the feedback on the second magnetic rotor 300 will be that the second magnetic rotor 300 also does not rotate according to the preset angle. For example, when 1 pulse signal is input to the first magnetic rotor 200, if the actual number of pulses is less than the theoretical number of pulses, i.e., the actual number of pulses is less than N, it can be judged that the electronic expansion valve is in a step-out state, a compensation pulse signal is calculated and input to the first magnetic rotor 200 to compensate for the step-out of the electronic expansion valve.

[0092] Further, the actual running state also includes a stall state. When there is no signal feedback from the sensor, i.e., the Hall sensor cannot sense the change in the magnetic pole of the second magnetic rotor 300, it is judged that the first magnetic rotor 200 does not rotate, and at this time the actual running state is a stall state, and the machine should be stopped for maintenance to ensure the normal use of the electronic expansion valve.

[0093] Further, because of the gear backlash of the transmission wheel set, when the rotation direction of the first magnetic rotor 200 changes, the rotation of the second magnetic rotor 300 will be delayed, and at this time the actual number of pulses of the second magnetic rotor 300 needs to be compensated in real time in the control software to ensure the accuracy of the judgment.

[0094] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0095] The foregoing description, for purposes of explanation, sets forth specific values and arrangements of components and steps that are subject to many variations in the light of specific circumstances and / or material or workpiece shapes. Such examples, while indicating preferred embodiments, are not intended to limit or restrict the various concepts taught herein. It will be appreciated that the dimensions of the parts shown in the drawings are not necessarily to scale, and have been shown as such for illustrative purposes only. Techniques, methods, and apparatus known to those of ordinary skill in the art can not be discussed in detail, but are contemplated as being part of the specification, where appropriate. In all examples shown and discussed herein, any specific values are to be interpreted as merely illustrative of the examples, and not as a limitation thereon. Thus, other examples of the exemplary embodiments can have different values. It is noted that like numbers and letters on the figures identify like parts throughout the disclosure, and thus, once an item is defined in one figure, it is not necessary to discuss it further in connection with other figures where it is shown and / or discussed.

[0096] In the description of the present application, it is necessary to understand that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship is usually based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the scope of protection of the present application; The orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0097] For the convenience of description, spatial relative terms such as "above", "upper", "on", "top", "bottom", etc. can be used herein to describe the spatial relationship of one device or feature to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0098] In addition, it should be noted that the use of the words "first", "second" and the like to describe various components is merely intended to facilitate the differentiation of the corresponding components, and the above words have no special meaning unless otherwise stated, therefore, it cannot be understood as a limitation on the scope of protection of the present application.

[0099] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electronic expansion valve characterized by, The electronic expansion valve comprises: a sleeve (100); a rotor assembly arranged inside the sleeve (100), the rotor assembly comprising a first magnetic rotor (200), a second magnetic rotor (300) and a speed increasing mechanism (400), the first magnetic rotor (200) being used to drive a valve needle (500) to rotate, the first magnetic rotor (200) being drivingly connected with the speed increasing mechanism (400), the speed increasing mechanism (400) being drivingly connected with the second magnetic rotor (300), the rotation speed of the first magnetic rotor (200) being less than that of the second magnetic rotor (300); a sensor (600) arranged outside the sleeve (100), the sensor (600) being used to detect the rotation angle of the second magnetic rotor (300).

2. The electronic expansion valve according to claim 1, characterized in that The speed increasing mechanism (400) comprises a transmission wheel set, the input end of the transmission wheel set being connected with the first magnetic rotor (200), the output end of the transmission wheel set being connected with the second magnetic rotor (300), and the transmission ratio of the transmission wheel set being less than 1.

3. The electronic expansion valve according to claim 2, characterized in that The transmission wheel set comprises a sun gear (410) and a plurality of planet gears (420), the planet gears (420) being engaged with the sun gear (410), the first magnetic rotor (200) being drivingly connected with the planet gears (420) to drive the planet gears (420) to rotate, and the sun gear (410) being fixedly connected with the second magnetic rotor (300) to drive the second magnetic rotor (300) to rotate synchronously with the sun gear (410).

4. The electronic expansion valve according to claim 3, characterized in that The transmission wheel set further comprises an internal gear structure and a planet carrier (430), the planet carrier (430) being fixedly arranged in the sleeve (100), the planet gears (420) being rotatably arranged on the planet carrier (430) and located on the side of the planet carrier (430) close to the first magnetic rotor (200), and the internal gear structure being arranged on the first magnetic rotor (200) and engaged with the planet gears (420), the first magnetic rotor (200) being capable of driving the planet gears (420) to rotate around the axis of the planet gears (420) through the internal gear structure.

5. The electronic expansion valve according to claim 4, wherein The first magnetic rotor (200) has a first driving section (201) and a second driving section (202) connected in sequence, the internal gear structure being arranged on the inner wall of the first driving section (201), the second driving section (202) being drivingly connected with the valve needle (500), and the first driving section (201) and the second driving section (202) being integrally formed.

6. The electronic expansion valve according to claim 4, wherein The speed increasing mechanism (400) further comprises a first ring gear, the internal gear structure being arranged on the inner wall of the first ring gear, and the first ring gear being fixedly connected with the first magnetic rotor (200).

7. The electronic expansion valve according to claim 4, wherein The planet wheel (420) is provided with a plurality of planet wheels (420) arranged annularly and spaced around the outer periphery of the sun wheel (410), the planet carrier (430) is provided with a first mounting hole, a first connecting shaft (421) is arranged in the first mounting hole, a plurality of first mounting holes and a plurality of first connecting shafts (421) are respectively arranged one-to-one corresponding to a plurality of planet wheels (420), and the planet wheel (420) is mounted on the first connecting shaft (421).

8. The electronic expansion valve according to claim 7, characterized in that The planet wheel (420) has a first connecting hole, the first connecting shaft (421) is arranged in the first connecting hole and fixedly connected with the planet carrier (430), and the first connecting shaft (421) and the first connecting hole are in clearance fit. Or, the planet wheel (420) has a first connecting hole, the first connecting shaft (421) is arranged in the first connecting hole and fixedly connected with the planet wheel (420), and the first connecting shaft (421) and the planet carrier (430) are in clearance fit.

9. The electronic expansion valve according to claim 4, wherein The sun wheel (410) has an engaging portion (411) and a connecting portion (412), the engaging portion (411) is used for engaging with the planet wheel (420), the connecting portion (412) is used for connecting the second magnetic rotor (300), the planet carrier (430) is provided with a first perforation, the connecting portion (412) is arranged in the first perforation, and the connecting portion (412) and the first perforation are in clearance fit.

10. The electronic expansion valve according to claim 4, wherein The planet carrier (430) and the sleeve (100) are welded or riveted.

11. The electronic expansion valve according to claim 3, wherein The first magnetic rotor (200) comprises a first body (210) and a first rotor connecting plate (220), the first body (210) is fixedly connected with the first rotor connecting plate (220), the first rotor connecting plate (220) is located on the side of the planet wheel (420) close to the first body (210), the speed increasing mechanism (400) further comprises an internal gear structure, the internal gear structure is fixedly arranged in the sleeve (100) and engaged with the planet wheel (420), the planet wheel (420) is rotatably arranged on the first rotor connecting plate (220), and the first magnetic rotor (200) can drive the planet wheel (420) to rotate around the axis of the planet wheel (420) and revolve around the sun wheel (410) through the first rotor connecting plate (220).

12. The electronic expansion valve according to claim 11, wherein The planet wheel (420) is provided with a plurality of planet wheels (420) arranged annularly and spaced around the outer periphery of the sun wheel (410), the first rotor connecting plate (220) is provided with a second mounting hole, a second connecting shaft (422) is arranged in the second mounting hole, a plurality of second mounting holes and a plurality of second connecting shafts (422) are respectively arranged one-to-one corresponding to a plurality of planet wheels (420), and the planet wheel (420) is mounted on the second connecting shaft (422).

13. The electronic expansion valve according to claim 12, wherein The second connecting shaft (422) is in clearance fit with the second mounting hole, and the planet wheel (420) is in fixed connection with the second connecting shaft (422); or the second connecting shaft (422) is in fixed fit with the second mounting hole, and the planet wheel (420) is in clearance fit with the second connecting shaft (422).

14. The electronic expansion valve of claim 11, wherein, The speed increasing mechanism (400) further comprises a second ring gear (440) fixedly arranged in the sleeve (100), and an inner gear structure is arranged on an inner wall of the second ring gear (440).

15. The electronic expansion valve according to claim 14, wherein The sun gear (410) has an engaging portion (411) for engaging with the planet wheel (420) and a connecting portion (412) for connecting the second magnetic rotor (300), an end portion of the second ring gear (440) away from the first magnetic rotor (200) is provided with an end plate (441), the end plate (441) is provided with a second through hole (4411), the connecting portion (412) is arranged in the second through hole (4411), and the connecting portion (412) is in clearance fit with the second through hole (4411).

16. The electronic expansion valve according to claim 3, wherein The second magnetic rotor (300) comprises a second body (310) and a second rotor connecting plate (320), the second body (310) is arranged at an outer periphery of the second rotor connecting plate (320), and an end portion of the sun gear (410) is fixedly connected with the second rotor connecting plate (320).

17. The electronic expansion valve according to claim 16, wherein The second body (310) and the second rotor connecting plate (320) are integrally formed.

18. The electronic expansion valve of claim 16, wherein, An end portion of the second rotor connecting plate (320) away from the sun gear (410) is provided with a protruding portion (321) for abutting against an inner wall of an end portion of the sleeve (100).

19. The electronic expansion valve according to claim 1, wherein The sensor (600) comprises one Hall sensor; or The sensor (600) comprises two Hall sensors, and a phase difference between the two Hall sensors is 90°.

20. The electronic expansion valve of claim 2, wherein, A transmission ratio of the transmission wheel set is N×(A / B×C / 2), wherein N is a positive integer, A is a pole pair number of the first magnetic rotor (200), B is a pole pair number of the second magnetic rotor (300), and C is a driving beat number of driving and controlling a pair of magnetic poles.

Images