US-12624871-B2 - Electronic expansion valve

US12624871B2US 12624871 B2US12624871 B2US 12624871B2US-12624871-B2

Abstract

An electronic expansion valve, including a valve body, the valve body having an accommodating cavity and a valve port, and the accommodating cavity being in communication with the valve port; a rotor arranged in the accommodating cavity; a stator assembly; a screw rod assembly arranged in the accommodating cavity, the screw rod assembly including a screw rod and a nut sleeve, the rotor being fixedly connected to an end of the screw rod away from the valve port; and a valve sleeve, the screw rod being in driving connection with the valve sleeve, where when the valve port is in a fully open state, the number of pulses is A, and when a central line of the stator assembly coincides with a central line of the rotor, the corresponding number of pulses is B, where 0.3*A≤B≤0.7*A.

Inventors

Yuchen He
Guanjun XU
Yonghao Chen
Hongfeng Huang

Assignees

ZHEJIANG DUNAN ARTIFICIAL ENVIRONMENT CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20220930
Priority Date: 20210930

Claims (19)

1 . An electronic expansion valve, comprising: a valve body, the valve body having an accommodating cavity and a valve port, and the accommodating cavity being in communication with the valve port; a rotor, the rotor being arranged in the accommodating cavity; a stator assembly, the stator assembly being arranged outside the valve body in a sleeving manner, and the stator assembly being arranged corresponding to the rotor; a screw rod assembly, the screw rod assembly being arranged in the accommodating cavity, the screw rod assembly comprising a screw rod and a nut sleeve, the nut sleeve being fixed to the valve body, the screw rod being arranged in the nut sleeve in a penetrating manner and being in threaded connection with the nut sleeve, the rotor being fixedly connected to an end of the screw rod away from the valve port, and the rotor driving the screw rod to rotate along the nut sleeve such that the screw rod and the rotor move in a direction toward or away from the valve port; and a valve sleeve, the screw rod being in driving connection with the valve sleeve, and the valve sleeve being used to block or open the valve port, wherein when the valve port is in a fully close state, a number of pulses is 0, when the valve port is in a fully open state, a number of pulses is A, and when a central line of the stator assembly that is perpendicular to an axis coincides with a central line of the rotor that is perpendicular to the axis, a corresponding number of pulses is B, wherein 0.3*A≤B≤0.7*A.
2 . The electronic expansion valve as claimed in claim 1 , wherein B=0.5*A.
3 . The electronic expansion valve as claimed in claim 1 , wherein a length of the rotor along an axial direction is L1, the stator assembly is provided with an upper polar plate and a lower polar plate that are arranged at an interval along the axial direction, and a distance between the upper polar plate and the lower polar plate is L2, wherein L2 is greater than L1.
4 . The electronic expansion valve as claimed in claim 3 , wherein 0.2 mm≤L2−L1≤1 mm; or 18 mm≤L1≤23 mm.
5 . The electronic expansion valve as claimed in claim 1 , wherein an outer diameter of the rotor is D1, and an inner diameter of the accommodating cavity is D2, wherein 0.3 mm≤D2−D1≤1 mm; or an outer diameter of the rotor is D1, wherein 13 mm≤D1≤18 mm.
6 . The electronic expansion valve as claimed in claim 1 , wherein an outer diameter of the valve body is D3, and an inner diameter of the stator assembly is D4, wherein 0.05 mm≤D4−D3≤0.5 mm.
7 . The electronic expansion valve as claimed in claim 1 , wherein a balancing channel is arranged in the valve sleeve, and the balancing channel can enable two ends of the valve sleeve to be communicated; wherein the valve sleeve is internally provided with a through hole, the through hole comprises a first hole section, a second hole section and a third hole section that are arranged in sequence, a diameter of the first hole section and a diameter of the third hole section are greater than a diameter of the second hole section, an end of the screw rod close to the valve port is arranged in the third hole section in a penetrating manner, a fixing piece is fixedly connected to the end of the screw rod close to the valve port, a diameter of the fixing piece is greater than the diameter of the second hole section, the fixing piece is arranged at an end of the third hole section away from the valve port, a connecting hole is formed in the fixing piece, an end part of the screw rod is arranged in the connecting hole in a penetrating manner, a first tangential structure is arranged on a side wall of the end of the screw rod close to the valve port, the first tangential structure extends to the first hole section, a first gap is formed between the first tangential structure and an inner wall of the through hole, a second gap is formed between the connecting hole and the first tangential structure, the first gap is in communication with the second gap, and the first gap and the second gap form the balancing channel, so as to balance air pressure at two ends of the valve sleeve.
8 . The electronic expansion valve as claimed in claim 1 , wherein the valve sleeve has a blocking position and a maximum opening position that are arranged oppositely, when the valve sleeve is positioned at the maximum opening position, a spacing L3 is formed between an end of the screw rod away from the valve sleeve and an inner wall of an end of the valve body away from the valve port, wherein the spacing L3 is between 0.8 mm and 2.1 mm.
9 . The electronic expansion valve as claimed in claim 8 , wherein the screw rod is provided with a connecting end and a driving end that are arranged oppositely, the driving end is arranged close to the valve port, the rotor is connected with the connecting end, and the driving end is in driving connection with the valve sleeve.
10 . The electronic expansion valve as claimed in claim 9 , wherein the rotor comprises a rotor body and a rotor connecting plate, the rotor body being arranged at a periphery of the screw rod, the rotor connecting plate being located between the rotor body and the screw rod, the rotor body being connected with the rotor connecting plate, the rotor connecting plate being provided with a mounting hole, and the connecting end penetrating out of the mounting hole and being connected with the rotor connecting plate.
11 . The electronic expansion valve as claimed in claim 9 , wherein the rotor comprises a rotor body and a rotor connecting plate, the rotor connecting plate has a first end surface and a second end surface that are arranged oppositely along an axis direction of the rotor, the first end surface is arranged toward the valve port, and an interval between the first end surface and an end surface of the connecting end is L4, wherein the L4 is between 4.9 mm and 5.5 mm.
12 . The electronic expansion valve as claimed in claim 10 , wherein when the valve sleeve is positioned at the blocking position along an axis direction of the screw rod, an interval between an end surface of a side of the rotor connecting plate close to the valve port and an end surface of an end of the nut sleeve away from the valve port is L5, wherein the L5 is between 0.7 mm and 2 mm.
13 . The electronic expansion valve as claimed in claim 12 , wherein a displacement of the valve sleeve moving from the blocking position to the maximum opening position is S, the nut sleeve has a first threaded section, and a length of the first threaded section is L6, wherein 1.5 S≤L6≤2.5 S; wherein the screw rod has a second threaded section, the second threaded section is in threaded connection with the first threaded section, and a length of the second threaded section is L7, wherein 1.5 S≤L7≤2.5 S.
14 . The electronic expansion valve as claimed in claim 13 , wherein the L7 is greater than the L6, and a difference between the L7 and the L6 is between 0 mm and 4 mm.
15 . The electronic expansion valve as claimed in claim 1 , further comprising: a rotor connecting plate, which is located in the accommodating cavity, wherein an outer peripheral edge of the rotor connecting plate is connected with the rotor, the rotor connecting plate is provided with a mounting hole formed in an axis direction, the screw rod has a first section, a second section and a third section that are arranged in sequence along the axial direction, the second section is arranged in the mounting hole in a penetrating manner and is connected with the mounting hole, a second tangential structure is arranged on a side wall of the screw rod, the second tangential structure extends to the second section from the first section, and the second tangential structure is configured to be matched with a fixture for positioning, wherein a distance between an end surface of the third section close to the second section and an end part of the mounting hole away from the third section is L8, and a distance between the end surface of the third section close to the second section and an end of the second tangential structure close to the third section is L9, wherein L9−L8≥0.15 mm.
16 . The electronic expansion valve as claimed in claim 15 , wherein L8 is between 1 mm and 3 mm; or, the first section is a tapered section, and a diameter of the first section is gradually increased toward a direction close to the second section; or, a diameter of the third section is greater than a diameter of the second section.
17 . The electronic expansion valve as claimed in claim 15 , wherein a diameter of the second section is D9, wherein D9 is between 1.2 mm and 4 mm.
18 . The electronic expansion valve as claimed in claim 17 , wherein a diameter of an end surface of the first section away from the second section is D10, wherein D10>0.5 mm.
19 . The electronic expansion valve as claimed in claim 18 , wherein a radial depth of the second tangential structure on the second section is T, wherein T<0.5*(D9−D10); or a distance between the end surface of the first section away from the second section and an end of the second tangential structure close to the third section is L10, wherein L10≥1 mm.

Description

CROSS-REFERENCE TO RELATED APPLICATION The present disclosure claims the priority to the patent application No. 202122405095.3 entitled “Electronic Expansion Valve”, the patent application No. 202122404589X entitled “Electronic Expansion Valve”, the patent application No. 202111166805X entitled “Electronic Expansion Valve”, and the patent application No. 2021224113524 entitled “Electronic Expansion Valve”, filed on Sep. 30, 2021 to Chine National Intellectual Property Administration. TECHNICAL FIELD The present disclosure relates to the technical field of control valves, in particular to an electronic expansion valve. BACKGROUND An electronic expansion valve includes a valve body, a rotor, a stator assembly, a screw rod assembly, a valve sleeve, and other components. The valve body has a cavity and a valve port, the rotor is arranged in the cavity, the rotor is connected with the screw rod assembly, the screw rod assembly is connected with the valve sleeve, the stator assembly is arranged outside the valve body, the stator assembly is arranged corresponding to the rotor, the stator assembly interacts with the rotor to enable the rotor to drive the screw rod assembly, and the rotor and the screw rod assembly do linear motion along an axis of the valve body, so as to drive the valve sleeve to block or open the valve port. The larger an area of a winding of the stator assembly directly facing the rotor is, the larger driving forces of the stator assembly and the rotor are. In a prior art, the positions of the stator assembly and the rotor are generally designed in that when the valve port is in a fully close state, the area of the rotor directly facing the stator assembly is maximum, and the driving force of the rotor driving the screw rod assembly to move is maximum. According to the above solution, when the valve body is in a fully open state, the area of the rotor directly facing the stator assembly is too small, resulting in that the valve sleeve is out-of-step or the valve port cannot be closed. SUMMARY The present disclosure provides an electronic expansion valve to solve the problem that when the electronic expansion valve in the prior art is in a fully open state, the driving force is relatively weak. The present disclosure provides an electronic expansion valve, including a valve body, the valve body having an accommodating cavity and a valve port, and the accommodating cavity being in communication with the valve port; a rotor, the rotor being arranged in the accommodating cavity; a stator assembly, the stator assembly being arranged outside the valve body in a sleeving manner, and the stator assembly being arranged corresponding to the rotor; a screw rod assembly, the screw rod assembly being arranged in the accommodating cavity, the screw rod assembly comprising a screw rod and a nut sleeve, the nut sleeve being fixed to the valve body, the screw rod being arranged in the nut sleeve in a penetrating manner and being in threaded connection with the nut sleeve, the rotor being fixedly connected to an end of the screw rod away from the valve port, and the rotor driving the screw rod to rotate along the nut sleeve such that the screw rod and the rotor move in a direction toward or away from the valve port; and a valve sleeve, the screw rod being in driving connection with the valve sleeve, and the valve sleeve being used to block or open the valve port, wherein when the valve port is in a fully close state, a number of pulses is 0, when the valve port is in a fully open state, a number of pulses is A, and when a central line of the stator assembly that is perpendicular to an axis coincides with a central line of the rotor that is perpendicular to the axis, a corresponding number of pulses is B, wherein 0.3*A≤B≤0.7*A. In an embodiment, B may be 0.3*A, 0.4*A, 0.5*A or 0.7*A. By applying the technical solution of the present disclosure, when the central line of the stator assembly that is perpendicular to the axis coincides with that of the rotor that is perpendicular to the axis, the force of the rotor driving the screw rod to rotate is maximum. If the number of pulses is less than 0.3*A, the driving force of the rotor is maximum when the valve port is close to be in a fully close state, that is, the driving force becomes weaker and weaker in the process of opening the valve port, resulting in that the valve port is slowly closed or cannot be fully closed. If the number of pulses is greater than 0.7*A, the driving force of the rotor is maximum when the valve port is close to be in a fully open state, that is, the driving force becomes weaker and weaker in the process of closing the valve port, resulting in that the valve port is slowly opened or cannot be fully opened. Therefore, the relationship between A and B is set to 0.3*A≤B≤0.7*A, and the driving force of the rotor is maximum when the valve port is in a semi-open state, such that the driving force is relatively balanced in the process of opening or