CN114352750A

CN114352750A - Valve needle assembly, electronic expansion valve and refrigeration equipment

Info

Publication number: CN114352750A
Application number: CN202210093242.4A
Authority: CN
Inventors: 曾庆军; 陈超; 杨茂
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd
Priority date: 2022-01-26
Filing date: 2022-01-26
Publication date: 2022-04-15
Anticipated expiration: 2042-01-26
Also published as: WO2023142223A1; CN114352750B; CN116753319A; CN116771935A

Abstract

The invention discloses a valve needle assembly, an electronic expansion valve and refrigeration equipment, wherein the valve needle assembly comprises: the valve needle is provided with a first end and a second end which are opposite, and the first end is used for being detachably arranged on a valve port of the electronic expansion valve; the limiting lantern ring is fixedly connected to the second end, at least one of the second end and the limiting lantern ring is provided with a mounting groove, the bearing is arranged in the mounting groove, and two end faces of an outer ring of the bearing are respectively limited and abutted by the valve needle and the limiting lantern ring; the valve rod penetrates through the limiting lantern ring and is movably inserted into the inner ring of the bearing; one end of the elastic piece is connected to the valve rod, and the other end of the elastic piece is connected to the bearing. The technical scheme of the invention aims to solve the technical problem that the valve needle is easy to wear because the valve needle rotates relative to the valve port in the prior art.

Description

Valve needle assembly, electronic expansion valve and refrigeration equipment

Technical Field

The invention relates to the field of electronic expansion valves, in particular to a valve needle assembly, an electronic expansion valve and refrigeration equipment.

Background

At present, an electronic expansion valve utilizes the principle of a stepping motor, a coil drives a magnetic rotor to rotate, the rotary motion of the magnetic rotor is converted into the axial motion of a valve rod, and the valve rod drives a valve needle connected with the valve rod to ascend or descend so as to control the flow rate of the electronic expansion valve.

In the related art, an electronic expansion valve mainly comprises a rotor, a valve rod, a nut and a valve needle, wherein the valve rod is rotatably connected with the nut, the valve needle is arranged at the lower end of the valve rod, and the rotor drives the valve rod to move axially so as to drive the valve needle to move axially, so that the purposes of plugging and opening the valve port are achieved. However, with the above structure, when the valve port is blocked and opened, the valve needle rotates relative to the valve port, so that the valve needle and the valve port are abraded, and the service life of the valve needle is shortened.

The above is only for the purpose of assisting understanding of the technical solutions of the present invention, and does not represent an admission that the above is the prior art.

Disclosure of Invention

The invention mainly aims to provide a valve needle assembly, and aims to solve the technical problem that in the prior art, a valve needle is easy to wear due to the fact that the valve needle rotates relative to a valve port.

In order to achieve the above object, the present invention provides a valve needle assembly for an electronic expansion valve, including:

a valve needle having first and second opposing ends, the first end for detachable mounting to a valve port of the electronic expansion valve;

the limiting sleeve ring is fixedly connected to the second end, and at least one of the second end and the limiting sleeve ring is provided with a mounting groove;

the bearing is arranged in the mounting groove, and two end surfaces of an outer ring of the bearing are respectively limited and abutted by the valve needle and the limiting lantern ring;

the valve rod is movably inserted in the inner ring of the bearing; and

and one end of the elastic piece is connected with the valve rod, and the other end of the elastic piece is connected with the bearing.

Optionally, the second end is provided with a mounting groove, the mounting groove arranged at the second end is provided with a first groove section and a second groove section which are distributed in the axial direction, the inner diameter of the first groove section is larger than that of the second groove section, a limiting step is formed at the communication position of the first groove section and the second groove section, and the limiting step is in limit abutment with the end surface, close to the first end, of the outer ring of the bearing.

Optionally, the end surface of the limiting lantern ring close to the first end is limited and abutted to the end surface of the outer ring of the bearing far away from the first end, and the limiting lantern ring is fixedly connected to the groove wall of the mounting groove of the second end.

Optionally, the position limiting lantern ring is inserted into the first groove section.

Optionally, the position limiting lantern ring is connected with the groove wall of the first groove section in a welding mode.

Optionally, the valve needle assembly further comprises a driving collar fixedly sleeved on the tail end of the valve needle, and the driving collar is located on one side of the bearing close to the first end.

Optionally, the terminal end of the valve needle is provided with a positioning step, and the driving collar abuts against the positioning step.

Optionally, the valve needle includes a needle body and a connecting portion connected to each other, the first end is located at the needle body, the second end is located at the connecting portion, the needle body and the connecting portion are integrally formed, or the needle body and the connecting portion are respectively and independently formed and then fixedly connected to each other.

Optionally, the elastic element is a spring, a flange portion is convexly disposed on one side of the circumferential wall of the valve rod, which is far away from the first end, of the bearing, the spring is sleeved on the valve rod, one end of the spring abuts against the flange portion, and the other end of the spring naturally abuts against an end surface of the bearing.

The invention also provides an electronic expansion valve, comprising:

the nut is provided with a mounting hole;

in the valve needle assembly, the valve rod of the valve needle assembly penetrates through the mounting hole and is in threaded connection with the nut.

The invention also provides refrigeration equipment comprising the electronic expansion valve.

In the technical scheme of the invention, the outer ring of the bearing is limited at two axial sides of the bearing through the valve needle and the limiting lantern ring respectively, so that the bearing can be fixedly arranged in the mounting groove. Therefore, when the valve rod synchronously rotates in the circumferential direction and moves in the axial direction to drive the valve needle to move, even if the bearing inner ring is driven to rotate along with the valve rod, the bearing outer ring fixedly connected with the valve needle can also keep static in the circumferential direction, and the valve needle cannot be driven to rotate in the circumferential direction. In the invention, the valve rod is matched with the bearing, so that the circumferential motion transmitted by the valve rod to the valve needle is counteracted, the valve needle only receives the axial motion transmitted by the valve rod and cannot rotate relative to the valve port, the abrasion between the valve needle and the valve port is favorably reduced, and the working reliability of the electronic expansion valve is ensured. Specifically, the valve rod drives the valve needle to move axially through the elastic part, and the valve needle can move axially relative to the bearing at least, so that when the valve needle supports the valve port, the valve rod can continue to move downwards relative to the valve needle, thereby compressing the elastic part, so that the elastic part can provide pretightening force for the valve needle, so that the valve needle can stably support the valve port, and meanwhile, the valve needle can be prevented from excessively extruding the valve port, and abrasion between the valve needle and the valve port is caused.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of one embodiment of a valve pin assembly of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at F;

FIG. 3 is an enlarged view of a portion of FIG. 1 at G;

FIG. 4 is a schematic structural diagram of an electronic expansion valve according to an embodiment of the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

FIG. 6 is a partial enlarged view of the portion B in FIG. 4;

FIG. 7 is an enlarged view of a portion of FIG. 4 at C;

FIG. 8 is an enlarged view of a portion of FIG. 4 at D;

fig. 9 is a partial enlarged view at E in fig. 4.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

The terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating 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 addition, if appearing throughout the text, "and/or" is meant to include three juxtaposed aspects, taking "A and/or B" as an example, including either the A aspect, or the B aspect, or both A and B satisfied aspects. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides an electronic expansion valve.

Referring to fig. 4, the electronic expansion valve according to the present invention includes a valve housing 100, a magnetic rotor 900, a nut 200, and a valve needle assembly. The valve housing 100 comprises an outer cover 101 and a valve seat 102 fixedly connected with the outer cover 101, the outer cover 101 and the valve seat 102 enclose to form a valve cavity 103, the magnetic rotor 900, the nut 200 and the valve needle assembly are all arranged in the valve cavity 103, the magnetic rotor 900 can rotate relative to the valve housing 100, the nut 200 is fixedly connected with the valve seat 102, and the magnetic rotor 900 drives the valve needle assembly to move so as to control the flow of the electronic expansion valve.

The structure of the valve pin assembly will now be described.

Referring to fig. 1 and 4 together, the valve pin assembly includes: a valve needle 500, a position-limiting collar 700, a bearing 600, a valve stem 300 and an elastic element 310, wherein the valve needle 500 has a first end 501 and a second end 502 which are opposite to each other, and the first end 501 is used for being detachably mounted on a valve port 104 of the electronic expansion valve; the position-limiting lantern ring 700 is fixedly connected to the second end 502, at least one of the second end 502 and the position-limiting lantern ring 700 is provided with a mounting groove, the bearing 600 is arranged in the mounting groove, and two end faces of an outer ring of the bearing 600 are respectively abutted by the valve needle 500 and the position-limiting lantern ring 700; the valve rod 300 is movably inserted into the inner ring of the bearing 600 after penetrating through the limit lantern ring 700; the elastic member 310 has one end connected to the valve stem 300 and the other end connected to the bearing 600.

It can be understood that one of the position-limiting collar 700 and the second end 502 may be provided with a mounting groove for mounting the bearing, an end surface of the other one directly abuts against one end surface of the outer ring of the bearing 600, and a position-limiting structure is formed in the mounting groove for abutting against the other end surface of the outer ring of the bearing 600; also, the limiting collar 700 and the second end 502 are respectively provided with mounting grooves with opposite notches, and limiting structures are arranged in the two mounting grooves and used for abutting against different end faces of the outer ring of the bearing 600. Therefore, the valve needle 500 and the position-restricting collar 700 can be brought into position-restricting abutment against both end surfaces of the outer ring of the bearing 600.

In the electronic expansion valve of the present invention, as shown in fig. 1, the nut 200 is provided with a mounting hole 210 extending along an axial direction thereof, the needle assembly is inserted into the mounting hole 210, and the valve rod 300 is in threaded connection with the nut 200. Specifically, one end of the valve rod 300 away from the first opening end is provided with a threaded rod section, and the mounting hole 210 includes a threaded hole 211 section matched with the threaded rod section, and the threaded rod section is matched with the threaded hole 211 section. The valve seat 102 is provided with a valve port 104 corresponding to the valve needle 500, and the valve needle 500 is detachably installed in the valve port 104. So, coil drive magnetic rotor 900 rotates, and magnetic rotor 900 drives the valve rod 300 and rotates, through the cooperation with screw rod section and screw hole 211 section, valve rod 300 can carry out circumferential direction and axial motion in step, and valve rod 300 drives needle 500 axial upward movement or axial downward movement again to control electronic expansion valve's flow size.

In the valve needle assembly of the present invention, the outer ring of the bearing 600 is limited at both sides of the bearing 600 in the axial direction by the valve needle 500 and the limiting collar 700, so that the bearing 600 can be fixedly installed in the installation groove. Therefore, when the valve rod 300 synchronously performs circumferential rotation and axial movement to drive the valve needle 500 to move, even if the inner ring of the bearing 600 is driven to rotate along with the valve rod 300, the outer ring of the bearing 600 fixedly connected with the valve needle 500 can be kept stationary in the circumferential direction, and the valve needle 500 cannot be driven to rotate in the circumferential direction. In the invention, the valve rod 300 is matched with the bearing 600, so that the circumferential motion transmitted from the valve rod 300 to the valve needle 500 is counteracted, the valve needle 500 only receives the axial motion transmitted by the valve rod 300 and does not rotate relative to the valve port 104, the abrasion between the valve needle 500 and the valve port 104 is favorably reduced, and the working reliability of the electronic expansion valve is ensured. Specifically, valve needle 500 is driven by valve rod 300 through elastic element 310 to move axially, and valve needle 500 is at least capable of moving axially relative to bearing 600, so that after valve needle 500 abuts against valve port 104, valve rod 300 can continue to move downward relative to valve needle 500, thereby compressing elastic element 310, so that elastic element 310 can provide a pre-tightening force for valve needle 500, thereby enabling valve needle 500 to stably abut against valve port 104, and simultaneously avoiding valve needle 500 from excessively pressing against valve port 104, which causes wear between valve needle 500 and valve port 104.

Specifically, an end of the elastic member 310 is connected to an end surface of the inner race of the bearing 600, which is away from the first end 501, and alternatively, the end of the elastic member 310 may be connected to end surfaces of the valve stem 300 and the inner race of the bearing 600 by abutting or fitting. The end of the elastic member 310 may directly contact the end surface of the inner ring of the valve stem 300 or the bearing 600, or may indirectly contact the end surface of the inner ring of the valve stem 300 or the bearing 600 through another member. Without loss of generality, as shown in fig. 1, in the present embodiment, the elastic member 310 is provided as a spring, the peripheral wall of the valve rod 300 is provided with a flange portion 320, and the spring is sleeved on the valve rod 300, and one end of the spring abuts against the flange portion 320, and the other end abuts against the end surface of the bearing 600, so as to respectively realize connection with the end surfaces of the valve rod 300 and the inner ring of the bearing 600. Of course, in other embodiments, the elastic member 310 may also be configured as a spring sheet, an elastic rubber sleeve or an elastic silicone sleeve.

In some embodiments, referring to fig. 1 and fig. 2, the mounting groove 530 is disposed at the second end 502, the mounting groove 530 disposed at the second end 502 has a first groove section and a second groove section distributed in an axial direction, an inner diameter of the first groove section is greater than an inner diameter of the second groove section, a limiting step 532 is formed at a communication position of the first groove section and the second groove section, and the limiting step 532 is limited and abutted to an end surface of an outer ring of the bearing 600 close to the first end 501. So, the second groove section is formed with the space of stepping down 531 promptly, the end of valve rod 300 can be convexly located the space of stepping down 531, so, the end of valve rod 300 can be to the space of stepping down 531 motion to compression spring provides the pretightning force for needle 500. Of course, in other embodiments, it is also possible to extend the axial length of the bearing 600 to provide enough space for the valve rod 300 to move axially, so as to ensure that the spring can be compressed into position to provide enough preload to the valve needle 500.

Further, referring to fig. 1 and fig. 3, an end surface of the position-limiting collar 700 close to the first end 501 is abutted to an end surface of an outer ring of the bearing 600 far from the first end 501, and the position-limiting collar 700 is fixedly connected to a groove wall of the mounting groove 530 of the second end 502. Without loss of generality, the position limiting lantern ring 700 is inserted into the first groove section and is fixedly connected to the groove wall of the first groove section in a welding manner. Of course, in other embodiments, the end surface of the bearing 600 may be flush with the end surface of the first groove section, and the position-limiting collar 700 is fixed to the end surface of the first groove section, i.e., may abut against the outer ring of the bearing 600, and in addition, the position-limiting collar 700 may be fixed to the mounting groove 530 in a clamping manner.

It can be understood that the limiting step 532 and the limiting collar 700 should only abut against the end surface of the outer ring of the bearing 600 to limit the axial movement and the circumferential rotation of the outer ring of the bearing 600 at the same time, and the axial movement of the inner ring of the bearing 600 will be limited accordingly, but the circumferential rotation of the inner ring of the bearing 600 will not be affected to ensure that the inner ring of the bearing 600 can be driven by the valve stem 300 to counteract the circumferential rotation of the valve stem 300. Moreover, the limiting step 532 and the limiting collar 700 cooperate to provide a large clamping force in the axial direction of the bearing 600, so that friction between the outer side surface of the bearing 600 and the groove wall of the mounting groove 530 can be avoided, thereby ensuring that the bearing 600 can be stably mounted in the mounting groove 530.

Further, as shown in fig. 3, the position limiting collar 700 includes a first guiding section 710 and a first connecting section 720 distributed and connected in the axial direction, the first connecting section 720 is connected to a groove wall of the first groove section, and an outer diameter of the first guiding section 710 is gradually decreased from an end connected to the first connecting section 720 toward an end away from the first connecting section 720. Thus, the mounting of the position limiting collar 700 into the mounting groove 530 can be more easily performed under the guidance of the first guide section 710. Of course, in other embodiments, the end surface of the first slot segment away from the second slot segment may be provided with a guiding structure for guiding the position limiting collar 700 and the bearing 600 to be installed in the installation slot 530.

Further, as shown in fig. 3, the first connecting section 720 is connected to the first guiding section 710 at two ends thereof. That is, both end surfaces of the position limiting collar 700 have guide structures, and when the position limiting collar 700 is assembled, the direction does not need to be distinguished, and when any end of the position limiting collar 700 is installed in the installation groove 530, the position limiting collar can be guided by the first guide section 710. Therefore, the production efficiency of the electronic expansion valve can be improved by the foolproof design of the limiting lantern ring 700.

In some embodiments, as shown in fig. 1, the valve needle assembly further includes a driving collar 800 fixedly sleeved on the end of the valve needle 500, and the driving collar 800 is located on a side of the bearing 600 close to the first end 501 and detachably abuts against an end surface of the bearing 600. Thus, when the valve rod 300 moves axially upward, the position-limiting collar 700 abuts against the end surface of the bearing 600, the position-limiting collar 700 is driven by the bearing 600 to move axially upward, the thrust force applied to the bearing 600 will also move upward, and the valve needle 500 fixedly connected to the bearing 600 will also move upward. Of course, in other embodiments, the periphery of the end of the valve rod 300 may be provided with a driving protrusion, so that when the valve rod 300 moves axially upwards, the driving protrusion pushes against the end surface of the bearing 600, and the valve needle 500 is also driven to move upwards.

Further, referring to fig. 1 and fig. 2, the end of the valve needle 500 is provided with a positioning step 330, and the driving collar 800 abuts against the positioning step 330. In this way, the positioning step 330 can play a role of positioning in the process of mounting the drive collar 800 on the valve needle 500, and when the end surface of the drive collar 800 abuts against the positioning step 330, it means that the drive collar 800 is mounted in place. Of course, in other embodiments, the inner side of the driving collar 800 may be provided with a positioning step 330, and when the end of the valve stem 300 abuts against the positioning step 330, it means that the driving collar 800 is installed in place.

Further, as shown in fig. 2, the driving collar 800 includes a second guiding section 820 and a second connecting section 810 distributed in the axial direction, the valve rod 300 is in interference fit with the second connecting section 810, the second guiding section 820 is located on one side of the second connecting section 810 close to the bearing 600, and the inner diameter of the second guiding section 820 gradually increases from one end close to the second connecting section 810 to one end far from the second connecting section 810. In this manner, the second guiding section 820 can guide the valve stem 300 and the driving collar 800 during the assembly process, so that the valve stem 300 can be inserted into the driving collar 800 more easily and quickly.

Further, as shown in fig. 2, the driving collar 800 further includes a transition section 830 located on a side of the second connecting section 810 close to the bearing 600, and the driving collar 800 has two second guiding sections 820, the transition section 830 is connected to an end surface of the driving collar 800 through one second guiding section 820, and is connected to the second connecting section 810 through the other second guiding section 820. That is, between the end of the driving collar 800 close to the bearing 600 and the end far from the bearing 600, there are a second guiding section 820, a transition section 830, a second guiding section 820 and a second connecting section 810 connected in sequence, wherein the transition section 830 is in clearance fit with the valve stem 300. When the driving collar 800 is assembled, the valve rod 300 is inserted from one end of the driving collar 800 close to the bearing 600, so that the end of the valve rod 300 contacts the position with the largest inner diameter of the second guide section 820 at the end of the driving collar 800 first, the end of the valve rod 300 can be conveniently clamped in a positioning manner, under the guide of the second guide section 820, the end of the valve rod 300 can be inserted into the transition section 830 in a relatively labor-saving manner, and then reaches another second guide section 820 through the transition section 830, the second guide section 820 is used for guiding the valve rod 300 to be inserted into the second connecting section 810, and because the second connecting section 810 is in interference fit with the valve rod 300, after the end of the valve rod 300 enters the second connecting section 810, the acting force needs to be increased, so that the valve rod 300 is continuously inserted into the driving collar 800 until the driving collar 800 abuts against the positioning step 330. Therefore, the assembly of the driving sleeve ring 800 and the valve rod 300 can be realized more conveniently and more labor-saving, and the production efficiency of the electronic expansion valve is improved.

In the electronic expansion valve of the present invention, as shown in fig. 4, a guide collar 400 is further installed in the valve chamber 103, and the guide collar 400 is located on one side of the nut 200 close to the valve port 104; the valve needle 500 is inserted into the valve port 104 after passing through the guide collar 400, and under the driving of the valve rod 300, the valve needle 500 moves relative to the valve port 104 along the axial direction under the guidance of the guide collar 400, so as to open or close the valve port 104. It will be appreciated that the guide collar 400 is disposed coaxially with the valve port 104. On one hand, the coaxiality of the valve needle 500 and the valve port 104 can be improved by the limitation of the guide collar 400 on the valve needle 500; on the other hand, when the valve rod 300 drives the valve needle 500 to move, the guide collar 400 can guide the axial movement of the valve needle 500 to ensure the smooth movement of the valve needle 500. Therefore, the valve needle 500 can keep high coaxiality with the valve port 104 in both the static state and the moving state, which is beneficial to ensuring the control accuracy of the opening degree of the valve port 104, thereby ensuring the working reliability of the electronic expansion valve. Moreover, under the guidance of the guide collar 400, the valve needle 500 does not unnecessarily move relative to the valve port 104, thereby reducing the wear between the valve needle 500 and the valve port 104, and being beneficial to prolonging the service life of the valve needle assembly, so as to further guarantee the operational reliability of the electronic expansion valve.

Further, in the present embodiment, referring to fig. 4 and fig. 9, the valve needle 500 includes a needle body 510 and a connecting portion 520 connected to each other, the needle body 510 is inserted into the valve port 104 after passing through the guiding collar 400, and the connecting portion 520 has a portion located in the inner cavity of the nut 200. Specifically, the nut 200 is provided with a first guide hole 212, the connecting portion 520 is inserted into the first guide hole 212 and has a portion located in the inner cavity of the nut 200, and the nut 200 provides guidance for the axial movement of the connecting portion 520 through the first guide hole 212; the guide collar 400 is provided with a second guide hole 401 for the needle body 510 to pass through, thereby guiding the axial movement thereof. It can be understood that the first guiding hole 212 and the second guiding hole 401 are coaxial with the valve port 104, and due to the dual limiting and guiding effects of the first guiding hole 212 of the nut 200 and the second guiding hole 401 of the guiding collar 400, the valve needle 500 and the valve port 104 have high coaxiality, which is beneficial to ensuring the accuracy of controlling the opening degree of the valve port 104, thereby ensuring the operational reliability of the electronic expansion valve. In particular, the depth of the second guiding hole 401 is greater than or equal to 1mm to satisfy the maximum axial motion progress of the needle body 510, so that the second guiding hole 401 can provide guiding function in the axial motion of the needle body 510. In addition, optionally, the needle body 510 and the connecting portion 520 may be integrally formed to improve the production and processing efficiency of the valve needle 500; or, the needle body 510 and the connecting portion 520 are separately molded and then fixedly connected to simplify the structure of the mold and ensure the yield of the finished product.

In some embodiments, as shown in fig. 9, the guide collar 400 further has a first yielding hole 402 axially distributed and communicated with the second guide hole 401, and one end of the connecting portion 520 connected to the needle body 510 protrudes out of the inner cavity of the nut 200 and is received in the first yielding hole 402. Further, a second yielding hole 403 is further formed in the guide collar 400, the second yielding hole 403 is communicated with one end, far away from the second guide hole 401, of the first yielding hole 402, and the nut 200 is partially accommodated in the second yielding hole 403. It can be understood that the second guiding hole 401 of the guiding collar 400 is required for guiding engagement of the valve needle 500, and the valve needle 500 is located close to the valve port 104, so that if the guiding collar 400 is connected to the valve housing 100 through the outer wall of the second guiding hole 401, the flow of the refrigerant near the valve port 104 is easily affected. In this embodiment, the first yielding hole 402 for yielding the connecting portion 520 and the second yielding hole 403 for yielding the nut 200 are sequentially disposed on the side of the second guiding hole 401 away from the valve port 104, so that the guiding collar 400 is fixedly connected to the valve housing 100 through the outer wall of the first yielding hole 402 or the outer wall of the second yielding hole 403, that is, the connecting structure between the guiding collar 400 and the valve housing 100 may have an adverse effect on the flow of the refrigerant.

In some embodiments, referring to fig. 4, 8 and 9, the outer wall of the guide collar 400 is protruded with a mounting step 410, the inner wall of the valve housing 100 is correspondingly provided with a step space 110, and the mounting step 410 is engaged with the step space 110. Specifically, the mounting step 410 is formed on the outer wall of the first and

second relief holes

402 and 403 opposite to each other, and the mounting step 410 is engaged with the step space 110, so that the guide collar 400 can be fixedly mounted on the valve housing 100.

Further, as shown in fig. 9, the stepped space 110 is formed by a first stepped surface 111 and a second stepped surface 112 which are connected together, the mounting step 410 includes a third stepped surface 411 abutting against the first stepped surface 111 and a fourth stepped surface 412 abutting against the second stepped surface 112, and the first stepped surface 111 is disposed in parallel to the axial direction of the guide collar 400. At least one of an end of the first step surface 111 away from the second step surface 112 and an end of the third step surface 411 close to the fourth step surface 412 is provided with a guide structure for guiding the mounting step 410 to be caught in the step space 110 when the guide collar 400 is assembled to the valve housing 100.

Specifically, as shown in fig. 9, in the present embodiment, a first guide surface 113 is provided on a side of the first step surface 111 away from the second step surface 112, and the first guide surface 113 is gradually disposed away from the third step surface 411 in a direction away from the first step surface 111. Further, the third step surface 411 is close to one end of the fourth step surface 412 is provided with two second guide surfaces 413, the second guide surfaces 413 are far away from the direction of the fourth step surface 412 and are gradually close to the first step surface 111, two a transition surface 414 is arranged between the second guide surfaces 413, the transition surface 414 is parallel to the axial direction of the guide lantern ring 400, the transition surface 414 is connected to the third step surface 411 through one of the second guide surfaces 413, and is connected to the fourth step surface 412 through the other guide surface. In order to obtain the best guiding effect, the first guiding surface 113 and the second guiding surface 413 may be arranged in parallel, i.e. in parallel or approximately in parallel.

During the assembly of the guide collar 400 in the valve housing 100, the second guide surface 413 closer to the fourth step surface 412 first enters the space inside the first guide surface 113, and then, as the installation step 410 is gradually clamped into the step space 110, the transition surface 414, the other guide surface, and the third step surface 411 sequentially enter the space inside the first guide surface 113, during which at least one of the first guide surface 113 and the second guide surface 413 can play a role in guiding the assembly until the third step surface 411 contacts the first step surface 111. Thus, through the stepped guide structure, the process of assembling the guide sleeve ring 400 on the valve housing 100 is more labor-saving and faster, and the production efficiency of the electronic expansion valve is improved.

In some embodiments, referring to fig. 4 and 9, the side wall of the valve housing 100 is formed with a refrigerant inlet 105, and the guiding collar 400 is formed with a guiding cone 420 opposite to the refrigerant inlet 105. Thus, when the refrigerant flows between the refrigerant passage opening 105 and the valve port 104, the flow guiding conical surface 420 can play a role in guiding the refrigerant to flow, and the working performance of the electronic expansion valve is prevented from being influenced by disordered flow of the refrigerant.

In some embodiments, referring to fig. 4, the valve chamber 103 includes a first valve chamber 1031 and a second valve chamber 1032 respectively located at two axial sides of the guide collar 400, and a balance passage for communicating the first valve chamber 1031 and the second valve chamber 1032 is provided on the guide collar 400 or the valve housing 100. Due to the arrangement of the balance passage, the air pressures of the first valve chamber 1031 and the second valve chamber 1032 can be balanced, which is beneficial to ensuring the stability of the internal pressure of the electronic expansion valve, and the action resistance of the valve needle 500 can be reduced, thereby ensuring the working performance of the electronic expansion valve.

Optionally, at least one of the first step surface 111 and the third step surface 411 is concavely provided with a first air passing groove, and at least one of the second step surface 112 and the fourth step surface 412 is concavely provided with a second air passing groove communicated with the first air passing groove, so as to form the balance channel in the first air passing groove and the second air passing groove. Without loss of generality, in an embodiment, the first step surface 111, the second step surface 112, the third step surface 411 and the fourth step surface 412 are all arranged in a ring shape, so that the installation step 410 and the step space 110 are correspondingly in a ring shape, the first step surface 111 and the third step surface 411 have a part which is abutted with each other and a part which is recessed to form a first air passing groove, and similarly, the second step surface 112 and the fourth step surface 412 have a part which is abutted with each other and a part which is recessed to form a second air passing groove. Thus, the mounting step 410 can be stably engaged with the step space 110, and a balance passage can be formed for the first valve chamber 1031 and the second valve chamber 1032 to communicate with each other. In this embodiment, the first valve chamber 1031 is located on the side of the guiding collar 400 away from the valve port 104, two ends of the first air passing groove are respectively communicated with one ends of the first valve chamber 1031 and the second air passing groove, and the other end of the second air passing groove is communicated with the second valve chamber 1032, so that the first valve chamber 1031 is communicated with the second valve chamber 1032, which is beneficial to ensuring the stability of the internal pressure of the electronic expansion valve, thereby ensuring the working stability of the electronic expansion valve.

Optionally, as shown in fig. 9, the outer wall of the guide collar 400 is further provided with a connecting surface 430, the mounting step 410 is connected to the flow guiding cone 420 through the connecting surface 430, and the connecting surface 430 is provided with a through air hole 440 penetrating through the inner wall of the guide collar 400, so as to form the balance channel in the through air hole 440. Specifically, a gap is formed between the connection surface 430 and the inner wall surface of the valve housing 100, the connection surface 430 is disposed opposite to the first relief hole 402, and the air passing hole 440 penetrates from the connection surface 430 to the inner wall surface of the first relief hole 402. Thus, the first valve chamber 1031 can communicate with the first relief hole 402 through the air passing hole 440. It can be understood that the first yielding hole 402 is a yielding connecting portion 520 with a larger gap from the connecting portion 520, and the second yielding hole 403 is a yielding nut 200 with a larger gap from the nut 200, so that the space in the first yielding hole 402 and the space in the second yielding hole 403 both belong to the space of the second valve chamber 1032. The first valve chamber 1031 is communicated with the first yielding hole 402, i.e. the second valve chamber 1032, so as to ensure the stability of the internal pressure of the electronic expansion valve, thereby ensuring the working stability of the electronic expansion valve.

Further, referring to fig. 4 to 7, the needle body 510 and the guiding collar 400 and the needle body 510 and the valve port 104 are in clearance fit, the connecting portion 520 and the inner wall surface of the nut 200 are in clearance fit, the fit clearance between the connecting portion 520 and the nut 200 is greater than the minimum fit clearance between the needle body 510 and the inner wall surface of the valve port 104, and the fit clearance between the needle body 510 and the guiding collar 400 is greater than the minimum fit clearance between the needle body 510 and the inner wall surface of the valve port 104.

Specifically, the fitting clearance between the connecting portion 520 and the nut 200 is a clearance between the outer wall surface of the connecting portion 520 and the inner wall surface of the first guide hole 212 (i.e., D3 in fig. 7). The needle body 510 has a main body segment 511 and a tip 512 distributed along the axial direction, the main body segment 511 is arranged through the second guiding hole 401 and is in clearance fit with the second guiding hole 401, and the fit clearance between the needle body 510 and the guiding collar 400 is the clearance between the outer wall surface of the main body segment 511 and the inner wall surface of the second guiding (i.e. D2 in fig. 6); the tip 512 is the first end 501 for inserting into the valve port 104, and the tip 512 is in clearance fit with the inner wall surface of the valve port 104 after being inserted into the valve port 104, and the minimum fit clearance between the needle body 510 and the inner wall surface of the valve port 104 is the minimum fit clearance (i.e., D1 in fig. 5) between the tip 512 and the inner wall surface of the valve port 104. In addition, due to the existence of the minimum fit clearance, when the valve needle 500 closes the valve port 104, a certain clearance is formed between the outer wall surface of the tip 512 and the inner wall surface of the valve port 104, so that the friction between the valve needle 500 and the valve port 104 can be reduced, and the valve needle 500 is prevented from being stuck.

In the electronic expansion valve of the present invention, when a foreign object is caught between the valve port 104 and the valve needle 500, even if the tip end 512 of the needle body 510 is deflected, since the fitting gap between the body section 511 of the needle body 510 and the second guide hole 401 is larger than the minimum fitting gap between the tip end 512 and the inner wall surface of the valve port 104, a sufficient moving space is provided between the body section 511 and the inner wall surface of the second guide hole 401, the body section 511 is brought into inclination with respect to the second guide hole 401, and is not caught with the second guide hole 401, but a certain gap is maintained with the inner wall surface of the second guide hole 401, and thus the up-and-down movement of the needle body 510 is not affected, and since the gap between the outer wall surface of the connection part 520 and the inner wall surface of the nut 200 is larger than the minimum fitting gap between the tip end 512 and the inner wall surface of the valve port 104, a sufficient moving space is provided between the connection part 520 and the first guide hole 212 of the nut 200, similarly, the connection portion 520 is inclined with respect to the inner wall surface of the first guide hole 212, and thus, does not get stuck to the first guide hole 212, but keeps a certain gap with the inner wall surface of the first guide hole 212, and thus, does not affect the up-and-down movement of the entire needle 500. In summary, when a foreign object is caught between the tip end 512 of the valve needle 500 and the valve port 104, since the main body section 511 of the valve needle 500 has enough deviation movement space in the inner cavity of the guide collar 400 and the connection part 520 in the inner cavity of the nut 200, the valve needle 500 can still move smoothly in the up-and-down direction, so that the valve needle 500 can be effectively prevented from being stuck, and simultaneously, the influence of eccentricity on the valve needle 500 caused by the coaxiality deviation in the valve needle assembly assembling process can be avoided.

Further, in the present embodiment, a fitting gap between the coupling part 520 and the nut 200 is larger than a fitting gap between the needle body 510 and the guide collar 400, that is, a gap D3 between an outer wall surface of the coupling part 520 and an inner wall surface of the first guide hole 212 is larger than a gap D2 between an outer wall surface of the main body segment 511 and an inner wall surface of the second guide hole 401. It can be understood that when the valve port 104 is opened, the tip 512 of the needle body 510 is separated from the valve port 104, and at this time, if a foreign object is caught in the gap between the main body segment 511 and the second guiding hole 401, even if the main body segment 511 tilts with respect to the second guiding hole 401 and drives the connecting portion 520 to tilt with respect to the first guiding hole 212, the connecting portion 520 will not be locked with the first guiding hole 212, but still maintain a certain gap with the inner wall surface of the first guiding hole 212, and thus, the up-and-down movement of the valve needle 500 as a whole will not be affected.

Further, in this embodiment, as shown in fig. 4, the nut 200 is provided with a threaded hole 211 communicated with the first guiding hole 212, the threaded hole 211 is located on a side of the first guiding hole 212 away from the valve port 104, one end of the valve rod 300 is connected to the connecting portion 520 in a driving manner, and the other end of the valve rod 300 is connected to the threaded hole 211 in a threaded manner, so that the coil drives the magnetic rotor 900 to rotate, the magnetic rotor 900 drives the valve rod 300 to rotate, the valve rod 300 can synchronously perform circumferential rotation and axial movement by matching with the threads of the nut 200, and the valve rod 300 drives the valve needle 500 to axially move upwards or axially downwards, thereby controlling the flow rate of the electronic expansion valve. And the thread section of the valve rod 300 is in clearance fit with the threaded hole 211, so that the valve rod 300 can have certain movement deviation in the radial direction relative to the nut 200, and the valve rod 300 and the nut 200 can further absorb the concentric deviation to improve the whole coaxiality.

In this embodiment, the fitting clearance between the valve stem 300 and the threaded hole 211 is larger than the fitting clearance (i.e., D3) between the connecting portion 520 and the first guide hole 212. It can be understood that the valve stem 300 is coaxially engaged with the valve needle 500, when the connection part 520 is inclined with respect to the first guide hole 212, since the minimum engagement gap between the valve stem 300 and the nut 200 occurs between the threaded section of the valve stem 300 and the threaded hole 211, which is greater than the engagement gap between the connection part 520 and the first guide hole 212, there is sufficient clearance between the valve stem 300 and the threaded section and the threaded hole 211, and even if the valve stem 300 is driven to incline with respect to the nut 200, the threaded section of the valve stem 300 will not be locked with the threaded hole 211 of the nut 200, and the up-down movement of the valve needle assembly of the electronic expansion valve will not be affected.

The present invention further provides a refrigeration device, which includes an electronic expansion valve, and the specific structure of the electronic expansion valve refers to the above embodiments, and since the refrigeration device adopts all the technical solutions of all the above embodiments, the refrigeration device at least has all the beneficial effects brought by the technical solutions of the above embodiments, and details are not repeated herein. The refrigeration equipment can be an air conditioner, a refrigerator, a heat pump water heater and the like.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A valve needle assembly for use in an electronic expansion valve, the valve needle assembly comprising:

the valve rod penetrates through the limiting lantern ring and is movably inserted into the inner ring of the bearing; and

2. The valve needle assembly of claim 1, wherein the mounting groove is formed at the second end, the mounting groove formed at the second end has a first groove section and a second groove section distributed in the axial direction, the inner diameter of the first groove section is larger than that of the second groove section, and a limit step is formed at the communication position of the first groove section and the second groove section, and the limit step is in limit abutment with an end surface of the outer ring of the bearing close to the first end.

3. The valve needle assembly of claim 2 wherein an end surface of the stop collar proximate the first end stops against an end surface of the outer race of the bearing distal the first end, and the stop collar is fixedly attached to a groove wall of the mounting groove at the second end.

4. The valve needle assembly of claim 3 wherein the stop collar is inserted into the first groove section.

5. The valve pin assembly of claim 4 wherein the stop collar is connected to the groove wall of the first groove segment by welding.

6. The valve needle assembly of claim 1 further comprising a drive collar fixedly disposed about the terminal end of the valve needle, the drive collar being disposed on a side of the bearing proximate the first end.

7. The valve needle assembly of claim 6 wherein the distal end of the valve stem is provided with a locating step against which the drive collar abuts.

8. The valve needle assembly of any one of claims 1 to 7, wherein the valve needle comprises a needle body and a connecting part which are connected, the first end is located at the needle body, the second end is located at the connecting part, and the needle body and the connecting part are integrally formed or are fixedly connected after being separately formed;

and/or the elastic element is a spring, a flange part is convexly arranged on one side, far away from the first end, of the peripheral wall of the valve rod on the bearing, and the spring is sleeved on the valve rod and is positioned between the flange part and the end surface of the bearing.

9. An electronic expansion valve, comprising:

the nut is provided with a mounting hole;

the valve needle assembly of any one of claims 1 to 8, wherein a valve stem of the valve needle assembly is arranged through the mounting hole and is in threaded connection with the nut.

10. A refrigeration appliance comprising the electronic expansion valve of claim 9.