CN114352750B

CN114352750B - Valve needle assembly, electronic expansion valve and refrigeration equipment

Info

Publication number: CN114352750B
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: 2023-12-12
Anticipated expiration: 2042-01-26
Also published as: CN116753319A; WO2023142223A1; CN114352750A; CN116771935A

Abstract

The invention discloses a valve needle assembly, an electronic expansion valve and refrigeration equipment, wherein the valve needle assembly comprises: the electronic expansion valve comprises a valve needle, a limiting collar, a bearing, a valve rod and an elastic piece, wherein 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 installed 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 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 into the inner ring of the bearing after penetrating through the limit lantern ring; 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. The technical scheme of the invention aims to solve the technical problem that in the prior art, the valve needle can rotate relative to the valve port to cause the valve needle to be easily worn.

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, the electronic expansion valve utilizes the principle of a stepping motor, drives a magnetic rotor to rotate through a coil, converts the rotary motion of the magnetic rotor into the axial motion of a valve rod, and drives a valve needle connected with the valve rod to ascend or descend by the valve rod to control the flow of the electronic expansion valve.

In the related art, the electronic expansion valve mainly comprises a rotor, a valve rod, a nut and a valve needle, wherein the valve rod is rotationally connected with the nut, the valve needle is arranged at the lower end of the valve rod, the rotor drives the valve rod to axially move, and then the valve needle is driven to axially move, so that the purposes of blocking and opening the valve port are achieved. However, by adopting the structure, when the valve port is plugged and opened, the valve needle can rotate relative to the valve port, so that the valve needle and the valve port are worn, and the service life of the valve needle is shortened.

The foregoing is merely provided to facilitate an understanding of the principles of the invention and is not admitted to be 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, the valve needle is easy to wear due to the fact that the valve needle rotates relative to a valve port.

To achieve the above object, the present invention provides a valve needle assembly applied to an electronic expansion valve, comprising:

a valve needle having opposed first and second ends, the first end for being detachably mounted to a port of the electronic expansion valve;

the limiting lantern ring is fixedly connected to the second end, and 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 surfaces of the outer ring of the bearing are respectively limited and abutted by the valve needle and the limiting collar;

the valve rod is movably inserted into 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 the mounting groove, locates the mounting groove of second end has first slot section and the second slot section that distributes in the axial, the internal diameter of first slot section is greater than the internal diameter of second slot section, and the department of communicating of first slot section with second slot section is formed with spacing step, spacing butt in the terminal surface that is close to of the outer lane of bearing the first end.

Optionally, the end face of the limiting collar, which is close to the first end, is in limiting abutment with the end face of the outer ring of the bearing, which is far away from the first end, and the limiting collar is fixedly connected to the groove wall of the mounting groove of the second end.

Optionally, the limit collar is inserted into the first groove section.

Optionally, the limit collar is connected with the groove wall of the first groove section in a welding manner.

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, close to the first end, of the bearing.

Optionally, a positioning step is arranged at the tail end of the valve needle, and the driving lantern ring is abutted against the positioning step.

Optionally, the valve needle includes needle body and connecting portion that are connected, first end is located the needle body, the second end is located connecting portion, the needle body with connecting portion integrated into one piece, or, the needle body with connecting portion respectively independent shaping back fixed connection.

Optionally, the elastic component sets up to the spring, the perisporium of valve rod is in the bearing keep away from one side of first end is protruding to be equipped with flange portion, the spring cover is located the valve rod, and one end butt in flange portion, the other end natural butt in the terminal surface of bearing.

The invention also proposes 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.

According to the technical scheme, the valve needle and the limiting lantern ring are used for limiting the outer ring of the bearing on two sides of the axial direction of the bearing respectively, so that the bearing can be fixedly arranged in the mounting groove. Therefore, when the valve rod synchronously performs circumferential rotation and axial movement 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 still in the circumferential direction, and the valve needle cannot be driven to rotate in the circumferential direction. According to the invention, the valve rod is matched with the bearing, so that the circumferential movement transmitted by the valve rod to the valve needle is counteracted, the valve needle only receives the axial movement transmitted by the valve rod and cannot rotate relative to the valve port, the abrasion between the valve needle and the valve port is reduced, and the working reliability of the electronic expansion valve is ensured. Specifically, the valve rod drives the valve needle to axially move through the elastic element, and the valve needle can at least axially move relative to the bearing, so that after the valve needle abuts against the valve port, the valve rod can continuously move downwards relative to the valve needle, and the elastic element is compressed, so that the elastic element can provide pretightening force for the valve needle, the valve needle can stably abut against 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 avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of an embodiment of a valve needle assembly of the present invention;

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

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

FIG. 4 is a schematic 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 at B in FIG. 4;

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

FIG. 8 is a partial enlarged view at D in FIG. 4;

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

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

The terms "coupled," "mounted," "secured," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, if there is a description of "first", "second", etc. in the embodiments 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 a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if the meaning of "and/or" is presented throughout this document, it is intended to include three schemes in parallel, taking "a and/or B" as an example, including a scheme, or B scheme, or a scheme where a and B meet simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in 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 are enclosed 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 needle assembly will be described.

Referring to fig. 1 and 4, the valve needle assembly includes: a valve needle 500, a stop collar 700, a bearing 600, a valve stem 300, and an elastic member 310, the valve needle 500 having opposed first and second ends 501, 502, the first end 501 for releasable mounting to the port 104 of the electronic expansion valve; the limit collar 700 is fixedly connected to the second end 502, at least one of the second end 502 and the limit collar 700 is provided with a mounting groove, the bearing 600 is arranged in the mounting groove, and two end surfaces of an outer ring of the bearing 600 are respectively abutted by the valve needle 500 and the limit collar 700; the valve rod 300 is movably inserted into the inner ring of the bearing 600 after penetrating through the limit collar 700; one end of the elastic member 310 is connected to the valve stem 300, and the other end is connected to the bearing 600.

It can be appreciated that one of the limit collar 700 and the second end 502 may be provided with a mounting groove for bearing installation, the end surface of the other end directly abuts against one end surface of the outer ring of the bearing 600, and a limit structure is formed in the mounting groove for abutting against the other end surface of the outer ring of the bearing 600; alternatively, the limiting collar 700 and the second end 502 are respectively provided with a mounting groove with opposite notches, and both the two mounting grooves are internally provided with limiting structures for abutting against different end surfaces of the outer ring of the bearing 600. Thus, both the needle 500 and the stopper collar 700 can come into stopper contact with 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 through the mounting hole 210, and the valve rod 300 is screwed with the nut 200. Specifically, the end of the valve rod 300 remote from the first opening end is provided with a threaded rod section, and the mounting hole 210 includes a threaded hole 211 section adapted to 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. In this way, 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 through the cooperation of the threaded rod section and the threaded hole 211 section, and the valve rod 300 drives the valve needle 500 to axially move upwards or axially move downwards, so that the flow of the electronic expansion valve is controlled.

In the needle assembly of the present invention, the outer ring of the bearing 600 is limited at both sides of the axial direction of the bearing 600 by the needle 500 and the limiting collar 700, respectively, so that the bearing 600 can be fixedly installed in the installation groove. Thus, when the valve rod 300 performs the circumferential rotation and the axial movement synchronously 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 remain stationary in the circumferential direction, and the valve needle 500 is not driven to perform the circumferential rotation. In the invention, by matching the valve rod 300 with the bearing 600, the circumferential movement transmitted by the valve rod 300 to the valve needle 500 is counteracted, so that the valve needle 500 only receives the axial movement transmitted by the valve rod 300 and cannot rotate relative to the valve port 104, thereby being beneficial to reducing the abrasion between the valve needle 500 and the valve port 104 and further ensuring the working reliability of the electronic expansion valve. Specifically, the valve rod 300 drives the valve needle 500 to axially move through the elastic member 310, and the valve needle 500 can at least axially move relative to the bearing 600, so that when the valve needle 500 abuts against the valve port 104, the valve rod 300 can continuously move downwards relative to the valve needle 500, thereby compressing the elastic member 310, so that the elastic member 310 can provide a pre-tightening force for the valve needle 500, and the valve needle 500 can stably abut against the valve port 104, and meanwhile, the valve needle 500 can be prevented from excessively pressing the valve port 104, so that abrasion between the valve needle 500 and the valve port 104 is avoided.

Specifically, the end of the elastic member 310 is connected to the end surface of the inner ring of the bearing 600 away from the first end 501, alternatively, the end of the elastic member 310 is connected to the valve stem 300 and the end surface of the inner ring of the bearing 600 in an abutting or caulking manner. 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. In this embodiment, as shown in fig. 1, the elastic member 310 is provided as a spring, the peripheral wall of the valve rod 300 is provided with a flange portion 320, the spring is sleeved on the valve rod 300, one end of the spring abuts against the flange portion 320, and the other end abuts against the end face of the bearing 600, so as to achieve connection between the spring and the valve rod 300 and the end face of the inner ring of the bearing 600. Of course, in other embodiments, the elastic member 310 may be configured as a spring plate, an elastic rubber sleeve, or an elastic silica gel sleeve.

In some embodiments, referring to fig. 1 and 2 together, the second end 502 is provided with the mounting groove 530, the mounting groove 530 provided at the second end 502 has a first groove section and a second groove section distributed in an axial direction, the inner diameter of the first groove section is larger than that of the second groove section, and a limiting step 532 is formed at a connection position of the first groove section and the second groove section, and the limiting step 532 is in limiting abutment with an end face of an outer ring of the bearing 600, which is close to the first end 501. In this way, the second groove section is formed with the space 531 that gives way, the end of the valve rod 300 can be convexly arranged in the space 531 that gives way, so that the end of the valve rod 300 can move towards the space 531 that gives way to compress the spring, thereby providing the pretightening force for the valve needle 500. Of course, in other embodiments, it is also possible to provide sufficient preload to the valve needle 500 by extending the axial length of the bearing 600 to provide sufficient space for axial movement of the valve stem 300, ensuring that the spring can be compressed into place.

Further, referring to fig. 1 and fig. 3 together, the end face of the limit collar 700 near the first end 501 is in limit contact with the end face of the outer ring of the bearing 600 far away from the first end 501, and the limit collar 700 is fixedly connected to the groove wall of the mounting groove 530 of the second end 502. Without loss of generality, the limiting collar 700 is inserted into the first groove section and is fixedly connected to the groove wall of the first groove section in a welding mode. Of course, in other embodiments, the end face of the bearing 600 may be flush with the end face of the first groove section, and the stop collar 700 may be fixed to the end face of the first groove section, i.e. may abut against the outer ring of the bearing 600, and the stop collar 700 may be fixed to the mounting groove 530 by means of a snap connection.

It will be appreciated that the stop steps 532 and the stop collar 700 should only abut against the end surface of the outer ring of the bearing 600 to simultaneously limit the axial movement and circumferential rotation of the outer ring of the bearing 600, and the axial movement of the inner ring of the bearing 600 will be limited therewith, but the circumferential rotation of the inner ring of the bearing 600 will not be affected, so as to ensure that the inner ring of the bearing 600 can be driven by the valve rod 300 to perform the function of counteracting the circumferential rotation of the valve rod 300. Moreover, the cooperation of the limiting step 532 and the limiting collar 700 can 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, and the bearing 600 can be stably mounted in the mounting groove 530.

Further, as shown in fig. 3, the stop collar 700 includes a first guide section 710 and a first connection section 720 which are axially distributed and connected, the first connection section 720 is connected with a groove wall of the first groove section, and an outer diameter of the first guide section 710 is gradually reduced from an end connected to the first connection section 720 toward an end far from the first connection section 720. In this way, the collar 700 can be more easily fitted into the mounting groove 530 under the guide of the first guide section 710. Of course, in other embodiments, the end surface of the first groove section away from the second groove section may be provided with a guiding structure, so that the limit collar 700 may be guided to be installed in the installation groove 530, or the bearing 600 may be guided to be installed in the installation groove 530.

Further, as shown in fig. 3, the first guide sections 710 are connected to both ends of the first connecting section 720. That is, both end surfaces of the stopper collar 700 have a guide structure, and when the stopper collar 700 is assembled, it is unnecessary to distinguish directions, and when any one end of the stopper collar 700 is fitted into the mounting groove 530, it can be guided by the first guide section 710. Thus, the production efficiency of the electronic expansion valve can be improved by carrying out fool-proof design on the limit collar 700.

In some embodiments, as shown in fig. 1, the valve needle assembly further includes a driving collar 800 fixedly sleeved on the distal end of the valve needle 500, where the driving collar 800 is located on a side of the bearing 600 near the first end 501 and detachably abuts against an end surface of the bearing 600. Thus, when the valve rod 300 moves upwards axially, since the limit collar 700 abuts against the end face of the bearing 600, the limit collar 700 is driven by the bearing 600 to move upwards axially, the bearing 600 will also move upwards under the pushing force, and the valve needle 500 fixedly connected with the bearing 600 will also move upwards. 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 upward, the driving protrusion pushes the end face of the bearing 600, and the valve needle 500 can be driven to move upward.

Further, referring to fig. 1 and 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 may play a role in positioning during the process of mounting the driving collar 800 on the valve needle 500, when the end surface of the driving collar 800 abuts against the positioning step 330, that is, it represents that the driving collar 800 is mounted in place. Of course, in other embodiments, the positioning step 330 may be disposed inside the driving collar 800, and when the end of the valve rod 300 abuts against the positioning step 330, it represents that the driving collar 800 is 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 an axial direction, the valve rod 300 is in interference fit with the second connecting section 810, the second guiding section 820 is located at one side of the second connecting section 810 near the bearing 600, and an inner diameter of the second guiding section 820 gradually increases from one end near the second connecting section 810 toward one end far from the second connecting section 810. In this manner, the second guide section 820 may act as a guide during assembly of the valve stem 300 and the drive collar 800, enabling a more labor-efficient and faster operation of inserting the valve stem 300 into the drive collar 800.

Further, as shown in fig. 2, the driving collar 800 further includes a transition section 830 located at a side of the second connection section 810 near the bearing 600, and the driving collar 800 has two sections of the second guide section 820, and the transition section 830 is connected to an end surface of the driving collar 800 through one of the second guide sections 820 and is connected to the second connection section 810 through the other of the second guide sections 820. That is, between the end of the driving collar 800 near the bearing 600 and the end far from the bearing 600 are a second guide section 820, a transition section 830, a second guide section 820 and a second connection section 810, which are sequentially connected, 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 should be inserted from one end of the driving collar 800 near the bearing 600, therefore, the end portion of the valve rod 300 will contact the position with the largest inner diameter of the second guiding section 820 at the end of the driving collar 800, the end portion of the valve rod 300 can be conveniently aligned and clamped in, the end portion of the valve rod 300 can be inserted into the transition section 830 with relatively saving effort under the guidance of the second guiding section 820, and then the second guiding section 820 reaches another second guiding section 820 through the transition section 830, the second guiding 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, the acting force needs to be increased after the end portion of the valve rod 300 enters the second connecting section 810, so that the valve rod 300 continues to be inserted into the driving collar 800 until the driving collar 800 abuts against the positioning step 330. Thus, the assembly of the driving collar 800 and the valve rod 300 can be realized more effort-saving and faster, which is beneficial to improving the production efficiency of the electronic expansion valve.

In the electronic expansion valve of the present invention, as shown in fig. 4, a guiding collar 400 is further installed in the valve cavity 103, and the guiding collar 400 is located at one side of the nut 200 near the valve port 104; the valve needle 500 is inserted into the valve port 104 after penetrating through the guide collar 400, and the valve needle 500 moves axially relative to the valve port 104 under the guidance of the guide collar 400 under the driving of the valve rod 300, so as to open or close the valve port 104. It is understood that the guide collar 400 is disposed coaxially with the valve port 104. On the one hand, the coaxiality of the valve needle 500 and the valve port 104 can be improved by limiting the valve needle 500 by the guide collar 400; on the other hand, when the stem 300 drives the needle 500 to move, the guide collar 400 can guide the axial movement of the needle 500 to ensure smooth movement of the needle 500. In this way, 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 accuracy of controlling the opening degree of the valve port 104, thereby ensuring the working reliability of the electronic expansion valve. Moreover, the valve needle 500 does not unnecessarily move relative to the valve port 104 under the guidance of the guide collar 400, so that the abrasion between the valve needle 500 and the valve port 104 can be reduced, the service life of the valve needle assembly can be prolonged, and the working reliability of the electronic expansion valve can be further ensured.

Further, in the present embodiment, referring to fig. 4 and 9, the valve needle 500 includes a needle body 510 and a connecting portion 520 that are connected, the needle body 510 is inserted into the valve port 104 after passing through the guide 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 connection part 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 connection part 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 guide hole 212 and the second guide hole 401 are coaxial with the valve port 104, and the coaxiality of the valve needle 500 and the valve port 104 is high due to the dual limiting function and the guiding function of the first guide hole 212 of the nut 200 and the second guide hole 401 of the guide collar 400, so that the accuracy of controlling the opening degree of the valve port 104 is ensured, and the working reliability of the electronic expansion valve can be ensured. In particular, the second guiding hole 401 has a hole depth greater than or equal to 1mm to satisfy the maximum axial movement progress of the needle body 510, so that the second guiding hole 401 can provide guiding function in the axial movement of the needle body 510. In addition, alternatively, the needle body 510 and the connecting part 520 may be integrally formed, so as to improve the production efficiency of the valve needle 500; or, the needle body 510 and the connecting portion 520 are formed separately and then fixedly connected to simplify the structure of the mold and ensure the yield.

In some embodiments, as shown in fig. 9, the guide collar 400 is further provided with first relief holes 402 axially distributed and communicated with the second guide holes 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 accommodated in the first relief holes 402. Further, a second abdication hole 403 is further provided in the guide collar 400, the second abdication hole 403 is communicated with one end of the first abdication hole 402 away from the second guide hole 401, and the nut 200 is partially accommodated in the second abdication hole 403. It will be appreciated that the second guide bore 401 of the guide collar 400 is required for guiding engagement of the valve needle 500, and that the valve needle 500 is positioned adjacent to the valve port 104, which tends to affect the flow of refrigerant adjacent to the valve port 104 if the guide collar 400 is coupled to the valve housing 100 via the outer wall of the second guide bore 401. In this embodiment, the first relief hole 402 of the relief connection portion 520 and the second relief hole 403 of the relief nut 200 are sequentially disposed on the side of the second guide hole 401 away from the valve port 104, so that the guide collar 400 is fixedly connected to the valve housing 100 through the outer wall of the first relief hole 402 or the outer wall of the second relief hole 403, and the connection structure between the guide collar 400 and the valve housing 100 can adversely affect the flow of the refrigerant.

In some embodiments, referring to fig. 4, 8 and 9, the outer wall of the guide collar 400 is convexly provided 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 opposite to the first relief hole 402 and the second relief hole 403, and the mounting step 410 engages with the step space 110, so that the guide collar 400 is fixedly mounted to the valve housing 100.

Further, as shown in fig. 9, the step space 110 is formed by commonly constructing a first step surface 111 and a second step surface 112 that are connected, the installation step 410 includes a third step surface 411 abutting against the first step surface 111 and a fourth step surface 412 abutting against the second step surface 112, and the first step surface 111 is disposed in parallel with the axial direction of the guide collar 400. Wherein at least one of an end of the first step surface 111 remote 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 provided away from the third step surface 411 in a direction away from the first step surface 111. Further, two second guiding surfaces 413 are disposed at one end of the third step surface 411, which is close to the fourth step surface 412, the second guiding surfaces 413 are gradually disposed close to the first step surface 111 in a direction away from the fourth step surface 412, a transition surface 414 is disposed between the two second guiding surfaces 413, the transition surface 414 is parallel to the axial direction of the guiding collar 400, and the transition surface 414 is connected to the third step surface 411 through one second guiding surface 413, and is connected to the fourth step surface 412 through the other guiding surface. In order to obtain an optimal guiding effect, the first guiding surface 113 and the second guiding surface 413 may be arranged in parallel, i.e. parallel or approximately parallel.

During the assembly of the guide collar 400 to 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 gradually snaps 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, and during this process, 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. Therefore, the step-type guiding structure can make the assembling process of the guiding collar 400 on the valve housing 100 more labor-saving and faster, and is beneficial to improving the production efficiency of the electronic expansion valve.

In some embodiments, referring to fig. 4 and 9, the side wall of the valve housing 100 is provided with a refrigerant passing opening 105, and the guide collar 400 is provided with a guide cone 420 opposite to the refrigerant passing opening 105. Thus, when the refrigerant flows between the refrigerant passing port 105 and the valve port 104, the flow guiding conical surface 420 can play a role in guiding the refrigerant to flow, so that the disorder of the refrigerant flow is avoided, and the working performance of the electronic expansion valve is influenced.

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

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 provided in a ring shape, so that the installation step 410 and the step space 110 are respectively in a ring shape, the first step surface 111 and the third step surface 411 have both a portion abutted against each other and a portion recessed to form the first air passing groove, and similarly, the second step surface 112 and the fourth step surface 412 have both a portion abutted against each other and a portion recessed to form the second air passing groove. In this way, 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. In this embodiment, the first valve cavity 1031 is located at one side of the guide collar 400 far away from the valve port 104, two ends of the first air passing groove are respectively connected to one ends of the first valve cavity 1031 and the second air passing groove, and the other end of the second air passing groove is connected to the second valve cavity 1032, so that the communication between the first valve cavity 1031 and the second valve cavity 1032 can be realized, 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 connection surface 430, the installation step 410 is connected to the diversion cone 420 through the connection surface 430, and the connection surface 430 is provided with an air passing hole 440 penetrating through the inner wall of the guide collar 400, so as to form the balance channel in the air passing hole 440. Specifically, a gap is provided between the connection surface 430 and the inner wall surface of the valve housing 100, and 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 be communicated with the first relief hole 402 through the air passing hole 440. It can be understood that the first relief hole 402 is formed by avoiding the connecting portion 520, and has a larger gap with the connecting portion 520, and the second relief hole 403 is formed by avoiding the nut 200, and also has a larger gap with the nut 200, so that the spaces in the first relief hole 402 and the second relief hole 403 are all the spaces of the second valve cavity 1032. The first valve cavity 1031 is communicated with the first relief hole 402, that is, is communicated with the second valve cavity 1032, so that the stability of the internal pressure of the electronic expansion valve can be ensured, and the working stability of the electronic expansion valve can be ensured.

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

Specifically, the fit clearance between the connection portion 520 and the nut 200 is a clearance between the outer wall surface of the connection portion 520 and the inner wall surface of the first guide hole 212 (i.e., D3 in fig. 7). The needle body 510 is provided with a main body section 511 and a tip 512 which are distributed along the axial direction, the main body section 511 penetrates through the second guide hole 401 and is in clearance fit with the second guide hole 401, and a fit clearance between the needle body 510 and the guide collar 400 is a clearance between the outer wall surface of the main body section 511 and the inner wall surface of the second guide (namely D2 in fig. 6); the tip 512 is the first end 501 for inserting 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 between the tip 512 and the inner wall surface of the valve port 104 (i.e. D1 in fig. 5). 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 friction between the valve needle 500 and the valve port 104 can be reduced, and the valve needle 500 is prevented from being blocked.

In the electronic expansion valve of the present invention, when foreign matter is trapped between the valve port 104 and the valve needle 500, even if the tip 512 of the needle body 510 is deflected, and since the fit clearance between the main body section 511 of the needle body 510 and the second guide hole 401 is larger than the minimum fit clearance between the tip 512 and the inner wall surface of the valve port 104, there is enough space between the main body section 511 and the inner wall surface of the second guide hole 401, the main body section 511 is driven to tilt relative to the second guide hole 401, and is not jammed with the second guide hole 401, but still keeps a certain clearance with the inner wall surface of the second guide hole 401, and also does not affect the up-down movement of the needle body 510, and since the clearance between the outer wall surface of the connecting portion 520 and the inner wall surface of the nut 200 is larger than the minimum fit clearance between the tip 512 and the inner wall surface of the valve port 104, the connecting portion 520 and the first guide hole 212 of the nut 200 have enough space, and likewise, after the connecting portion is driven to tilt relative to the inner wall surface of the first guide hole 212, the connecting portion 520 is not jammed with the first guide hole 212, but still does not affect the up-down movement of the whole valve needle 500. In summary, when the foreign matter is trapped between the tip 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 connecting portion 520 in the inner cavity of the nut 200, the valve needle 500 can still move smoothly in the up-down direction, so that the valve needle 500 can be effectively prevented from being blocked, and meanwhile, the influence of the eccentricity caused by the coaxiality deviation on the valve needle 500 in the assembly process of the valve needle assembly can be avoided.

Further, in the present embodiment, the fit clearance between the connection part 520 and the nut 200 is larger than the fit clearance between the needle body 510 and the guide collar 400, that is, the clearance D3 between the outer wall surface of the connection part 520 and the inner wall surface of the first guide hole 212 is larger than the clearance D2 between the outer wall surface of the main body section 511 and the inner wall surface of the second guide hole 401. It will be appreciated 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 jammed in the gap between the main body section 511 and the second guiding hole 401, even if the main body section 511 is inclined relative to the second guiding hole 401 and the connecting portion 520 is driven to incline relative to the first guiding hole 212, the connecting portion 520 will not be jammed with the first guiding hole 212, but still keeps a certain gap with the inner wall surface of the first guiding hole 212, so that the overall up-and-down movement of the valve needle 500 will not be affected.

Further, in this embodiment, as shown in fig. 4, the nut 200 is provided with a threaded hole 211 that is communicated with the first guide hole 212, the threaded hole 211 is located on a side of the first guide hole 212 away from the valve port 104, one end of the valve rod 300 is drivingly connected to the connecting portion 520, and the other end of the valve rod 300 is threadedly connected with the threaded hole 211, so that the coil drives the magnetic rotor 900 to rotate, the magnetic rotor 900 drives the valve rod 300 to rotate, and the valve rod 300 can synchronously perform circumferential rotation and axial movement, and the valve rod 300 drives the valve needle 500 to axially move upwards or axially move downwards, thereby controlling the flow rate of the electronic expansion valve. The threaded section of the valve rod 300 is in clearance fit with the threaded hole 211, so that the valve rod 300 can have a 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 concentricity deviation to improve the overall coaxiality.

In this embodiment, the fit-in gap between the valve rod 300 and the threaded hole 211 is larger than the fit-in gap (i.e., D3) between the connecting portion 520 and the first guide hole 212. It will be appreciated that when the valve stem 300 is coaxially engaged with the valve needle 500 and the connection portion 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 larger than the engagement gap between the connection portion 520 and the first guide hole 212, there is a sufficient space 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 is not 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 is not affected.

The invention also provides a refrigeration device, which comprises an electronic expansion valve, and the specific structure of the electronic expansion valve refers to the embodiment, and because the refrigeration device adopts all the technical schemes of all the embodiments, the refrigeration device at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein. The refrigerating equipment can be an air conditioner, a refrigerator, a heat pump water heater and the like.

The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.

Claims

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

the bearing is arranged in the mounting groove, and two end surfaces of the outer ring of the bearing are respectively limited and abutted by the valve needle and the limiting collar so as to be fixedly mounted in the mounting groove;

the valve rod is movably inserted into the inner ring of the bearing after penetrating through the limit lantern ring; and

one end of the elastic piece is connected with the valve rod, the other end of the elastic piece is connected with the bearing, and the elastic piece is positioned at one side of the bearing, which is away from the bottom of the mounting groove;

the second end is provided with the 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 part of the first groove section and the second groove section, and the limiting step is in limiting abutting joint with the end face, close to the first end, of the outer ring of the bearing;

the limiting lantern ring is inserted into the first groove section and is connected with the groove wall of the first groove section in a welding mode;

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

2. The valve needle assembly of claim 1, wherein the distal end of the stem is provided with a locating step, the drive collar abutting the locating step.

3. A valve needle assembly according to claim 1 or 2, wherein the valve needle comprises a needle body and a connecting part which are connected, the first end is positioned on the needle body, the second end is positioned on the connecting part, the needle body and the connecting part are integrally formed, or the needle body and the connecting part are respectively and independently formed and then fixedly connected;

and/or the elastic piece is provided with a spring, the peripheral wall of the valve rod is convexly provided with a flange part at one side of the bearing, which is far away from the first end, and the spring is sleeved on the valve rod and is positioned between the flange part and the end face of the bearing.

4. An electronic expansion valve, comprising:

the nut is provided with a mounting hole;

a valve needle assembly according to any one of claims 1 to 3, a stem of the valve needle assembly passing through the mounting bore and being threadably connected to the nut.

5. A refrigeration device comprising the electronic expansion valve of claim 4.