CN113294528A - Electronic expansion valve and refrigeration equipment - Google Patents

Abstract

The invention discloses an electronic expansion valve and refrigeration equipment. The electronic expansion valve comprises a valve seat, a nut, a valve needle and a magnetic rotor. The nut is fixedly connected to the valve seat and forms a refrigerant cavity in a surrounding manner with the valve seat, the nut is provided with a mounting hole communicated with the refrigerant cavity, at least part of the mounting hole is a threaded hole section, and the valve seat is provided with a valve port communicated with the refrigerant cavity; the outer peripheral surface of the valve needle is provided with a thread section, and the valve needle extends into the refrigerant cavity from the mounting hole and is in threaded connection with the mounting hole; the magnetic rotor is sleeved on the valve needle outside the refrigerant cavity and can drive the valve needle to rotate relative to the nut, so that the valve needle can be lifted in the mounting hole and inserted into the valve port or separated from the valve port. The technical scheme of the invention can simplify the structure of the electronic expansion valve, thereby reducing the manufacturing cost.

Description

Electronic expansion valve and refrigeration equipment

Technical Field

The invention relates to the technical field of control valves, in particular to an electronic expansion valve and refrigeration equipment using the same.

Background

In the related art, the electronic expansion valve mainly includes a valve seat, a rotor, a screw rod, a nut and a valve needle, wherein the screw rod is rotatably connected with the nut, the valve needle is arranged at the lower end of the screw rod, and the magnetic rotor drives the screw rod to axially move so as to drive the valve needle to axially move, so that a valve port on the valve seat is blocked or opened. However, the electronic expansion valve drives the valve needle to close and open the valve port through the additionally arranged screw rod, so that the electronic expansion valve has more parts and relatively complex structure, and the manufacturing cost of the electronic expansion valve is increased.

Disclosure of Invention

The invention mainly aims to provide an electronic expansion valve, aiming at simplifying the structure of the electronic expansion valve so as to reduce the manufacturing cost.

In order to achieve the above object, the present invention provides an electronic expansion valve comprising:

a valve seat;

the nut is fixedly connected to the valve seat and forms a refrigerant cavity by enclosing with the valve seat, the nut is provided with a mounting hole communicated with the refrigerant cavity, at least part of the mounting hole is a threaded hole section, and the valve seat is provided with a valve port communicated with the refrigerant cavity;

the valve needle is provided with a thread section on the outer peripheral surface, extends into the refrigerant cavity from the mounting hole and is in threaded connection with the mounting hole; and

the magnetic rotor is sleeved on the valve needle outside the refrigerant cavity and can drive the valve needle to rotate relative to the nut, so that the valve needle can lift in the mounting hole and is inserted into the valve port or is separated from the valve port.

In an embodiment of the present invention, in a direction in which the valve needle approaches the valve port, the valve needle sequentially includes a first segment, a second segment, and a third segment, the magnetic rotor is sleeved on the first segment, an outer circumferential surface of the second segment is a threaded segment, and the third segment is insertable into the valve port;

the mounting hole includes first hole section, second hole section and third hole section in proper order, the second hole section is the screw hole section, the first section body with first hole section cooperatees, the second section body with second hole section cooperatees, the third section body with third hole section cooperatees.

In an embodiment of the present invention, a diameter of the first segment is defined as d1, a diameter of the second segment is defined as d2, and a diameter of the third segment is defined as d3, which satisfy the following relations: d1 > d2 > d 3.

In an embodiment of the present invention, the valve needle further includes an insertion section, the insertion section is connected to an end of the third section, which is far away from the second section, and the diameter of the insertion section is smaller than that of the third section and is insertable into the valve opening.

In an embodiment of the present invention, when the insertion section body is inserted into the valve port, a gap is formed between the insertion section body and the valve port.

In an embodiment of the present invention, the insertion segment body includes:

the constant-diameter section is connected to one end, far away from the second section body, of the third section body, the constant-diameter section can be inserted into the valve port, and a gap is formed between the constant-diameter section and the valve port; and

the conical section is connected to one end, far away from the third section body, of the constant-diameter section, the area of the cross section of the conical section is reduced in the direction that the valve needle is close to the valve port, and a gap is formed between the conical section and the valve port.

In an embodiment of the present invention, the valve needle further includes a fixing segment, the fixing segment is connected to an end of the first segment away from the second segment, and a diameter of the fixing segment is smaller than a diameter of the first segment;

the magnetic rotor is sleeved on the fixed section body and is abutted against the surface of the first section body, which is far away from the second section body.

In an embodiment of the present invention, the magnetic rotor includes:

the magnetic body is of a cylindrical structure with openings at two ends; and

the limiting plate is connected to the inner side wall of the magnetic body and sleeved on the valve needle located outside the refrigerant cavity, and the magnetic body drives the valve needle to rotate relative to the nut through the limiting plate.

In an embodiment of the present invention, a guide rail is disposed on an outer side wall of the nut, the guide rail extends spirally in a direction in which the valve needle approaches the valve port, the electronic expansion valve further includes a sliding part, and a portion of the sliding part is embedded in the guide rail and can slide along an extending direction of the guide rail;

the magnetic rotor further comprises a butting part, the butting part is connected to the limiting plate, and the butting part butts and drives the sliding part when the valve needle is driven by the magnetic rotor to rotate relative to the nut.

In an embodiment of the present invention, the electronic expansion valve further includes a spring, and the spring is sleeved on the nut and forms a guide rail by enclosing with the nut;

the slider includes ring body and extension rod, the ring body is the heliciform setting, and is located in the guide rail, the extension rod connect in the ring body, and can by the butt piece butt drives.

In an embodiment of the present invention, the electronic expansion valve further includes an outer cover, the outer cover is a cylindrical structure with an opening at one end, the outer cover is connected to the valve seat and covers the nut, the valve needle and the magnetic rotor;

and/or, the electronic expansion valve further comprises a refrigerant inlet pipe and a refrigerant outlet pipe, the refrigerant inlet pipe is communicated with the refrigerant cavity, and the refrigerant outlet pipe is communicated with the valve port.

The present invention also provides a refrigeration apparatus comprising an electronic expansion valve, the electronic expansion valve comprising:

a valve seat;

the nut is fixedly connected to the valve seat and forms a refrigerant cavity by enclosing with the valve seat, the nut is provided with a mounting hole communicated with the refrigerant cavity, at least part of the mounting hole is a threaded hole section, and the valve seat is provided with a valve port communicated with the refrigerant cavity;

the valve needle is provided with a thread section on the outer peripheral surface, extends into the refrigerant cavity from the mounting hole and is in threaded connection with the mounting hole; and

the magnetic rotor is sleeved on the valve needle outside the refrigerant cavity and can drive the valve needle to rotate relative to the nut, so that the valve needle can lift in the mounting hole and is inserted into the valve port or is separated from the valve port.

When the electronic expansion valve is used, the magnetic rotor can sense the electromagnetic force rotary motion of the coil component and drive the valve needle to rotate relative to the nut. Because the valve needle is in threaded fit with the nut, the valve needle can slide axially in the rotating process, namely, the valve needle can lift and fall along the valve port close to or far away from the valve seat in the mounting hole. So that the valve needle can be inserted into or separated from the valve port, thereby realizing the control of the closing and opening of the electronic expansion valve.

In addition, the valve needle of the electronic expansion valve in the scheme is provided with the thread section, so that the electronic expansion valve can be directly matched with the nut in a thread manner. Compared with the prior art, the electronic expansion valve drives the valve needle to close and open the valve port through the additional screw rod and nut which are in threaded fit, so that the electronic expansion valve has more parts and relatively complex structure. The electronic expansion valve in the scheme does not need to additionally arrange the screw rod to drive the valve needle, so that the number of parts of the electronic expansion valve can be reduced, the structure is relatively simple, and the manufacturing cost of the electronic expansion valve is favorably reduced.

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 cross-sectional view of an overall structure of an electronic expansion valve according to an embodiment of the present invention;

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

fig. 3 is an exploded view of the valve needle and nut of the electronic expansion valve of fig. 1;

fig. 4 is a schematic structural view of a sliding member of the electronic expansion valve of fig. 1.

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 all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are 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, 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.

Referring to fig. 1, the present invention provides an electronic expansion valve 100, which can be used for controlling the flow rate of a refrigerant of a refrigeration device.

In an embodiment of the present invention, the electronic expansion valve 100 includes a valve seat 10, a nut 20, a valve needle 30, and a magnetic rotor 40. The nut 20 is fixedly connected to the valve seat 10 and forms a refrigerant cavity 101 by enclosing with the valve seat 10, the nut 20 is provided with a mounting hole 21 communicated with the refrigerant cavity 101, at least part of the mounting hole 21 is a threaded hole section, and the valve seat 10 is provided with a valve port 11 communicated with the refrigerant cavity 101; the outer peripheral surface of the valve needle 30 is provided with a threaded section, and the valve needle 30 extends into the refrigerant cavity 101 from the mounting hole 21 and is in threaded connection with the mounting hole 21; the magnetic rotor 40 is sleeved on the valve needle 30 outside the refrigerant cavity 101, and can drive the valve needle 30 to rotate relative to the nut 20, so that the valve needle 30 is lifted in the mounting hole 21 and inserted into the valve port 11, or separated from the valve port 11.

In an embodiment of the present invention, the valve seat 10 may be used to mount and carry components such as the nut 20, the valve needle 30, and the magnetic rotor 40, so that the components of the electronic expansion valve 100 may be assembled into a whole. The valve seat 10 may be a cylindrical structure with openings at two ends, one of the openings may be formed as the valve port 11, and the other opening is covered by the nut 20. The valve seat 10 may be a circular structure so that the shape is regular and the valve seat is easy to machine. Of course, the present application is not limited thereto, and in other embodiments, the valve seat 10 may also have a square structure or other shape structures. The nut 20 may be used to form a cooling medium chamber 101 with the valve seat 10, and the mounting hole 21 of the nut 20 may be coaxially disposed with the valve port 11 of the valve seat 10, so as to facilitate the accurate insertion of the valve needle 30 into the valve port 11. The nut 20 may be completely disposed outside the valve seat 10, or may be partially embedded in an opening formed at an end of the valve seat 10 away from the valve port 11. This can increase the abutting area of the nut 20 and the valve seat 10, thereby contributing to the improvement of the stability of the connection of the both and the sealing member. Further, the nut 20 may be sleeved with a connecting piece 22, and the connecting piece 22 may cover the connection between the nut 20 and the valve seat 10, so as to further improve the sealing performance of the connection between the nut 20 and the valve seat 10. The connecting piece 22 and the nut 20 can be embedded into the outer peripheral surface of the nut 20 to realize clamping fixation of the two, and can be fixed with the nut 20 by welding, so as to better connect stability of the two during explosion. In addition, the nut 20 may also be a circular structure, so that the shape is regular and the nut is convenient to machine and form, and meanwhile, the size is relatively small, which is beneficial to reducing the occupied space. The mounting hole 21 of the nut 20 may be a partially threaded hole section, and in this case, the upper end, the middle portion or the lower end of the mounting hole 21 may be formed as a threaded hole section. Of course, the upper end, middle portion or lower end of the mounting hole 21 may be formed as a threaded hole section. One end of the valve needle 30 can be inserted into the mounting hole 21 and is screwed with the mounting hole 21. The valve needle 30 extending into the refrigerant cavity 101 from the mounting hole 21 may be inserted into the valve port 11 to completely close the valve port 11 (i.e., the valve needle 30 is tightly attached to the valve port 11 so that refrigerant cannot pass through) or partially close the valve port 11 (i.e., a gap is formed between the valve needle 30 and the valve port 11 so that a small amount of refrigerant can pass through); and can be separated from the valve port 11 to fully open the valve port 11. The magnetic rotor 40 may be used to provide power to rotate the valve needle 30 relative to the nut 20. Specifically, a coil member may be provided outside the magnet rotor 40, and the magnet rotor 40 may sense the electromagnetic force rotation motion of the coil member. The valve needle 30 and the magnetic rotor 40 are connected to rotate synchronously, and the valve needle is lifted and lowered to and from the valve port 11 under the action of the threaded cooperation between the nut 20 segment of the valve needle 30 and the mounting hole 21 of the nut 20, so that the valve port 11 can be inserted and separated. The magnetic rotor 40 may be a cylindrical structure with an open end, so that the shape of the magnetic rotor is adapted to the rotation track to reduce the possibility of interference during the movement.

When the electronic expansion valve 100 according to the present invention is used, the magnetic rotor 40 senses the electromagnetic rotation of the coil component, and drives the valve needle 30 to rotate relative to the nut 20. Due to the threaded engagement of the valve needle 30 and the nut 20, the valve needle 30 is capable of sliding axially during rotation, i.e. lifting and lowering along the mounting hole 21 towards and away from the valve port 11 on the valve seat 10. So that the valve needle 30 can be inserted into the valve port 11 or separated from the valve port 11, thereby realizing the control of the closing and opening of the electronic expansion valve 100.

In addition, the valve needle 30 of the electronic expansion valve 100 in the present embodiment has a threaded section, so that it can be directly screwed with the nut 20. Compared with the prior art in which the electronic expansion valve 100 drives the valve needle 30 to close and open the valve port 11 through the additional screw rod and the nut 20 in threaded fit, the electronic expansion valve 100 has relatively more parts and relatively more complex structure. The electronic expansion valve 100 in the present embodiment does not need to additionally provide a lead screw to drive the valve needle 30, so that the number of parts of the electronic expansion valve 100 can be reduced, and the structure is relatively simple, thereby being beneficial to reducing the manufacturing cost of the electronic expansion valve 100.

Referring to fig. 1 and fig. 3, in an embodiment of the present invention, in a direction in which the valve needle 30 approaches the valve port 11, the valve needle 30 sequentially includes a first segment 31, a second segment 33, and a third segment 35, the magnetic rotor 40 is sleeved on the first segment 31, an outer circumferential surface of the second segment 33 is a threaded segment, and the third segment 35 is insertable into the valve port 11; the mounting hole 21 sequentially comprises a first hole section 211, a second hole section 213 and a third hole section 215, the second hole section 213 is a threaded hole section, the first section 31 is matched with the first hole section 211, the second section 33 is matched with the second hole section 213, and the third section 35 is matched with the third hole section 215.

It can be understood that, only the outer peripheral surface of the second section of the valve needle 30 is a threaded section, so that the length of the threaded section is not too long, and thus the two are convenient to complete the screwing process quickly, which is beneficial to improving the convenience of installing the valve needle 30. Meanwhile, since the second segment 33 is located at the middle of the valve needle 30, the valve needle 30 and the mounting hole 21 can be connected at a middle position. This contributes to a more uniform distribution of the locking force between the valve needle 30 and the mounting bore 21 over the valve needle 30, which contributes to an improved stability of the mounting of the valve needle 30 as a whole on the nut 20. Of course, it should be noted that the present application is not limited thereto, and in other embodiments, the outer peripheral surface of the first segment 31 may be a threaded segment, and in this case, the first mounting hole 21 may be correspondingly configured as a threaded hole segment. Or, the outer peripheral surfaces of the first segment 31 and the second segment 33 are both threaded sections, and at this time, the first mounting hole 21 and the second mounting hole 21 are both correspondingly provided as threaded hole sections.

Referring to fig. 3, in an embodiment of the invention, the diameter of the first segment 31 is defined as d1, the diameter of the second segment 33 is defined as d2, and the diameter of the third segment 35 is defined as d3, which satisfy the following relation: d1 > d2 > d 3.

It can be understood that, since the diameters of the first, second and third segments 31, 33 and 35 are sequentially reduced (in this case, the diameters of the first, second and third hole sections 211, 213 and 215 are also sequentially reduced), the valve needle 30 can extend one end of the third segment 35 into the refrigerant cavity 101 through the mounting hole 21 from top to bottom, so as to achieve relatively fast mounting. Moreover, the arrangement also enables the valve needle 30 to be inserted into the nut 20 after the nut 20 and the valve seat 10 are installed, thereby avoiding the influence on the subsequent installation of the nut 20 and the valve seat 10 caused by the valve needle 30 being inserted into the nut 20 first. Of course, it should be noted that the present application is not limited thereto, and in other embodiments, the diameter d1 of the first segment 31, the diameter d2 of the second segment 33, and the diameter d3 of the third segment 35 may also be the same. Alternatively, d1 < d2 < d 3.

Referring to fig. 1, fig. 2 and fig. 3, in an embodiment of the present invention, the valve needle 30 further includes an insertion section 37, the insertion section 37 is connected to an end of the third section 35 away from the second section 33, and the diameter of the insertion section 37 is smaller than that of the third section 35 and is insertable into the valve port 11.

It will be appreciated that, since the valve port 11 is generally provided to be relatively small, the valve needle 30 includes the insertion section 37, and the valve needle is inserted into the valve port 11 through the insertion section 37. This allows the diameters of the first, second and third segments 31, 33, 35 of the valve needle 30 to be set relatively large (i.e., larger than the valve port 11) to increase the overall strength of the valve needle 30, thereby facilitating the service life of the valve needle 30. Moreover, when the second segment 33 of the valve pin 30 is relatively large, it is also convenient to form a threaded segment on the valve pin 30, thereby improving the convenience of processing and manufacturing the valve pin. Of course, it should be noted that the present application is not limited thereto, and in other embodiments, when the valve needle 30 does not include the insertion section 37, it is also possible to directly set the diameter of the second section 33 to be relatively small.

Referring to fig. 2, in an embodiment of the present invention, when the insertion section 37 is inserted into the valve port 11, a gap is formed between the insertion section 37 and the valve port 11.

Among them, in some systems, especially in a household air conditioning system with one drive, if the electronic expansion valve 100 fails in a fully closed state, it is easy to cause partial vacuum pumping in the refrigeration circuit, and further damage the compressor and even the entire refrigeration system. Therefore, when the insertion segment 37 is inserted into the valve port 11, a gap is formed between the insertion segment 37 and the valve port 11, so that when the electronic expansion valve is in a closed state, the refrigerant in the refrigerant cavity 101 can still pass through a certain amount through the gap between the insertion segment 37 and the valve port 11, thereby effectively solving the problem of vacuum in a refrigeration system loop caused by the continuous operation of the compressor when the electronic expansion valve 100 is in the closed state. The insertion section 37 may have gaps between the valve port 11 and the insertion section 37 in the circumferential direction, or a gap between the insertion section 37 and the valve port 11. In other embodiments, the insertion section 37 may be inserted into the valve port 11 to completely seal the valve port 11.

Referring to fig. 2, in an embodiment of the present invention, the insertion section 37 includes an equal-diameter section 371 and a tapered section 373, the equal-diameter section 371 is connected to an end of the third section 35 away from the second section 33, the equal-diameter section 371 is insertable into the valve port 11, and a gap is formed between the equal-diameter section 371 and the valve port 11; the tapered section 373 is connected to the end of the constant-diameter section 371 away from the third section 35, the cross-sectional area of the tapered section 373 decreases in the direction in which the valve needle 30 approaches the valve port 11, and a gap is formed between the tapered section 373 and the valve port 11.

It can be understood that the equal-diameter section 371 is disposed such that the insertion section 37 maintains a certain gap with the valve port 11 after being inserted into the valve port 11, thereby achieving that a portion of the refrigerant still passes through the valve port 11 when the electronic expansion valve 100 is in the closed state. The conical section 373 is configured to enable the size of the gap between the valve needle 30 and the valve port 11 to be changed by the conical section 373 during the lifting process of the valve needle 30 driven by the magnetic rotor 40, so as to achieve the adjustment of the flow rate of the valve port 11. Further, the insertion section body 37 further includes a transition section 375, and opposite ends of the transition section 375 are connected to the third section body 35 and the constant diameter section 371, respectively. At this time, since the diameters of the constant diameter section 371 and the tapered section 373 are relatively small, the transition section 375 connected to the third section body 35 can make the diameter of the valve needle 30 change from top to bottom more uniformly, which is beneficial to ensure the uniformity of the strength everywhere. The transition section 375 may have a cylindrical portion and a conical portion in sequence in the direction of the valve needle 30 approaching the valve port 11, and the cross section of the conical portion decreases in the direction of the valve needle 30 approaching the valve port 11. So can make this transition portion have the assurance intensity of certain diameter, have better play transition connection effect. At this time, one end of the mounting hole 21 close to the refrigerant cavity 101 may be flared so as to better correspond to the conical portion of the transition section 375, and also perform a flow guiding function on the refrigerant in the refrigerant cavity 101. Similarly, the end of the mounting hole 21 away from the refrigerant cavity 101 may be flared, so that the refrigerant can flow out faster after passing through the gap between the tapered section 373 of the insertion section 37 and the valve port 11. Of course, the transition section 375 may also be only a cylindrical or conical portion in the direction of the valve needle 30 approaching the valve port 11. Further, the insertion section body 37 may further include a needle section 377, and the needle section 377 is connected to an end tapered away from the constant diameter section 371, so as to prevent the valve pin 30 from being easily damaged by forming a sharp edge at the end. In addition, in other embodiments, the insertion section body 37 may only include the equal-diameter section 371 or the tapered section 373.

Referring to fig. 1, in an embodiment of the present invention, the valve needle 30 further includes a fixing section 39, the fixing section 39 is connected to an end of the first section 31 away from the second section 33, and a diameter of the fixing section 39 is smaller than a diameter of the first section 31; the magnetic rotor 40 is sleeved on the fixed segment 39 and abuts against the surface of the first segment 31 away from the second segment 33.

It can be understood that, since the diameter of the fixed segment 39 is smaller than that of the first segment 31, the surface of the first segment 31 far from the second segment 33 can form a limit step. So locate the fixed segment body 39 with the magnetic rotor 40 cover on, can play spacing supporting role to magnetic rotor 40 through spacing step to be convenient for with accurate the installing in predetermineeing the mounted position of magnetic rotor 40, also can improve the stability of magnetic rotor 40 installation simultaneously. Of course, when the needle 30 does not include the fixed segment 39, the magnetic rotor 40 may be directly sleeved on the first segment 31. In one embodiment, the valve needle 30 may include a fixing section 39, a first section 31, a second section 33, a third section 35, and an inserting section 37, and at this time, the fixing section 39, the first section 31, the second section 33, the third section 35, and the inserting section 37 may be an integral structure, so as to ensure the overall strength of the valve needle 30 and simplify the process for machining the valve needle, thereby improving the production efficiency.

Referring to fig. 1, in an embodiment of the present invention, a magnetic rotor 40 includes a magnetic body 41 and a position-limiting plate 43, where the magnetic body 41 has a cylindrical structure with openings at two ends; the limit plate 43 is connected to the inner sidewall of the magnet body 41 and is sleeved on the needle 30 outside the refrigerant cavity 101, and the magnet body 41 drives the needle 30 to rotate relative to the nut 20 through the limit plate 43.

It can be understood that the magnet rotor 40 is composed of the magnet body 41 and the position limiting plate 43, so that the magnet body 41 and the position limiting plate 43 can be separately manufactured first and then assembled into a whole after being molded respectively, thereby facilitating the convenience of processing and manufacturing the magnet rotor. The position limiting plate 43 may be a circular structure and is embedded into the inner peripheral surface of the magnet body 41 to achieve clamping fixation. When the valve needle 30 only includes the first segment 31, the second segment 33 and the third segment 35, the limiting plate 43 may be sleeved on the first segment 31. When the valve needle 30 further includes the fixed segment 39, the limiting plate 43 may be sleeved on the fixed segment 39. In addition, in another embodiment, the magnetic rotor 40 includes a magnetic body 41 and a connecting rod, the magnetic body 41 is sleeved on the needle 30, and the connecting rod may connect the needle 30 and the magnetic body 41.

Referring to fig. 1, in an embodiment of the present invention, a guide rail 23 is disposed on an outer side wall of the nut 20, the guide rail 23 extends spirally in a direction in which the valve needle 30 approaches the valve port 11, the electronic expansion valve 100 further includes a sliding member 60, a portion of the sliding member 60 is embedded in the guide rail 23 and can slide along an extending direction of the guide rail 23; the magnetic rotor 40 further comprises an abutting piece 45, the abutting piece 45 is connected to the limit plate 43, and when the magnetic rotor 40 drives the needle 30 to rotate relative to the nut 20, the abutting piece 45 abuts to drive the sliding piece 60.

It can be understood that the sliding member 60 can be driven by the abutting member 45 in the rotating process of the magnetic rotator, and the stroke of the guide rail 23 has an upper limit and a lower limit, so that the sliding member 60 also has an upper limit position and a lower limit position in the lifting process along the set guide rail 23. At this time, the control of the lifting stroke of the needle 30 by the magnetic rotor 40 is correspondingly realized. The abutting member 45 may include a connection plate 451 and an abutting plate 453, wherein the connection plate 451 is sleeved on the fixed segment 39 of the needle 30 and connected to the lower surface of the limit plate 43; the connection plate 451 is connected to the stopper plate 43 and extends in a direction of the valve needle 30 toward the valve port 11. Thus, when the abutting piece 45 is installed, the needle can be directly sleeved on the needle 30 and then further limited and fixed, so that the convenience of installation and the stability of installation abutting are improved.

Referring to fig. 1 and fig. 4, in an embodiment of the present invention, the electronic expansion valve 100 further includes a spring 50, the spring 50 is sleeved on the nut 20 and forms a guide rail 23 with the nut 20; the sliding member 60 includes a ring body 51 and an extension rod 53, the ring body 51 is disposed spirally and is located in the guide rail 23, and the extension rod 53 is connected to the ring body 51 and can be driven by the abutting member 45.

It will be appreciated that the formation of the rail 23 by the cooperation of the spring 50 and the nut 20 eliminates the need to form the rail 23 directly on the outer peripheral surface of the nut 20, thereby simplifying the complexity of forming the rail 23. The spring 50 and the nut 20 may be fixed by being clamped, that is, the nut 20 may be provided with a clamping groove 25 for inserting one end of the spring 50. Of course, it is also possible to weld the spring 50 directly to the nut 20. In other embodiments, the guide rail 23 may be formed by directly forming a spiral groove in the nut 20.

Referring to fig. 1, in an embodiment of the present invention, the electronic expansion valve 100 further includes a housing 70, the housing 70 is a cylindrical structure with one end open, the housing 70 is connected to the valve seat 10 and covers the nut 20, the valve needle 30 and the magnetic rotor 40.

It can be understood that the nut 20, the valve needle 30 and the magnetic rotor 40 can be covered by the cover 70, that is, the nut 20, the valve needle 30 and the magnetic rotor 40 can be shielded and protected to reduce the possibility of damage, thereby being beneficial to prolonging the service life of the nut 20, the valve needle 30 and the magnetic rotor 40. Wherein, the outer cover 70 and the valve seat 10 can be fixed by welding to improve the stability of the connection between the two. Of course, the present application is not limited thereto, and in other embodiments, the cover 70 and the valve seat 10 may be connected by screws or snap-fit connection.

Referring to fig. 1, in an embodiment of the present invention, the electronic expansion valve 100 further includes a refrigerant inlet pipe 80 and a refrigerant outlet pipe 90, the refrigerant inlet pipe 80 is communicated with the refrigerant cavity 101, and the refrigerant outlet pipe 90 is communicated with the valve port 11.

It can be understood that the arrangement of the refrigerant inlet pipe 80 and the refrigerant outlet pipe 90 provides a connection position for connecting with an external pipe body on the electronic expansion valve 100, thereby facilitating the installation of the electronic expansion valve 100 on a pipeline. The refrigerant inlet pipe 80 and the refrigerant outlet pipe 90 may be welded to the valve seat 10, so as to improve the sealing property and the connection stability at the connection. Of course, the present invention is not limited thereto, and in other embodiments, the refrigerant inlet pipe 80 and the refrigerant outlet pipe 90 may be connected to the valve seat 10 by a snap connection or a screw connection.

The assembly process of the electronic expansion valve 100 of the present invention is: sleeving the spring 50 on the nut 20, and limiting and fixing the spring 50 on the nut 20 to form a guide rail 23 by enclosing the spring 50 and the nut 20; then, the sliding part 60 is sleeved on the nut 20 and embedded into the guide rail 23; then fixedly connecting the nut 20 to the valve seat 10;

then, one end of the valve needle 30 penetrates into the valve seat 10 from the mounting hole 21, and the valve needle 30 is rotated in the first direction, so that the valve needle 30 is adjusted to insert the tapered section 373 of the valve needle 30 into the valve port 11; then, the valve needle 30 is rotated by a preset angle in a second direction opposite to the first direction, so that a gap is formed between the tapered section 373 of the valve needle 30 and the valve port 11; then the magnetic rotor 40 is sleeved on the valve needle 30; then the valve needle 30 is kept still, and the magnetic rotor 40 is rotated, so that the abutting piece 45 of the magnetic rotor 40 abuts to drive the sliding piece 60 to slide to the end position of one end of the guide rail 23 close to the valve port 11; then the magnetic rotor 40 is welded and fixed with the valve seat 10; the cover 70 then covers the nut 20, the valve needle 30 and the magnet rotor 40, and the cover 70 is fixedly attached to the valve seat 10. The spring 50 may be fixed to the nut 20 by providing a clamping groove 25 on the outer circumferential surface of the nut 20, and one end of the spring 50 is embedded in the clamping groove 25 to fix the spring 50 and the nut. The sliding member 60 may include a ring body 51 and an extension rod 53, the ring body 51 is spirally disposed and slidably embedded in the guide rail 23, one end of the extension rod 53 is connected to the ring body 51, and the other end extends outside. And the nut 20 and the valve seat 10 may be fixed by welding to improve the sealing and stability of the connection therebetween. Of course, a screw connection or a snap connection may be used. After one end of the valve needle 30 passes through the mounting hole 21, the valve needle 30 can be rotated in the first direction so that the valve needle 30 can be lowered to be inserted into the valve port 11. At this time, the first direction may be one of clockwise and counterclockwise. The valve needle 30 may then be rotated in the second direction to accurately adjust the valve needle 30 such that a clearance is formed between the tapered section 373 of the valve needle 30 and the valve port 11. At this time, the second direction is opposite to the first direction, i.e., the other of the clockwise direction and the counterclockwise direction. After the magnetic rotor 40 is sleeved on the valve needle 30, the magnetic rotor 40 may be rotated in the first direction, so that the abutting member 45 of the magnetic rotor 40 abuts to drive the sliding member 60 to slide to the end position of the guide rail 23 close to the end of the valve port 11, that is, the lower limit position of the sliding member 60 sliding on the guide rail 23. After the electronic expansion valve 100 is assembled, the assembly structure of the electronic expansion valve 100 can be referred to fig. 1.

The present invention also proposes a refrigeration device comprising an electronic expansion valve 100, the electronic expansion valve 100 comprising a valve seat 10, a nut 20, a valve needle 30 and a magnetic rotor 40. The nut 20 is fixedly connected to the valve seat 10 and forms a refrigerant cavity 101 by enclosing with the valve seat 10, the nut 20 is provided with a mounting hole 21 communicated with the refrigerant cavity 101, at least part of the mounting hole 21 is a threaded hole section, and the valve seat 10 is provided with a valve port 11 communicated with the refrigerant cavity 101; the outer peripheral surface of the valve needle 30 is provided with a threaded section, and the valve needle 30 extends into the refrigerant cavity 101 from the mounting hole 21 and is in threaded connection with the mounting hole 21; the magnetic rotor 40 is sleeved on the valve needle 30 outside the refrigerant cavity 101, and can drive the valve needle 30 to rotate relative to the nut 20, so that the valve needle 30 is lifted in the mounting hole 21 and inserted into the valve port 11, or separated from the valve port 11.

In an embodiment of the present invention, the valve seat 10 may be used to mount and carry components such as the nut 20, the valve needle 30, and the magnetic rotor 40, so that the components of the electronic expansion valve 100 may be assembled into a whole. The valve seat 10 may be a cylindrical structure with openings at two ends, one of the openings may be formed as the valve port 11, and the other opening is covered by the nut 20. The valve seat 10 may be a circular structure so that the shape is regular and the valve seat is easy to machine. Of course, the present application is not limited thereto, and in other embodiments, the valve seat 10 may also have a square structure or other shape structures. The nut 20 may be used to form a cooling medium chamber 101 with the valve seat 10, and the mounting hole 21 of the nut 20 may be coaxially disposed with the valve port 11 of the valve seat 10, so as to facilitate the accurate insertion of the valve needle 30 into the valve port 11. The nut 20 may be completely disposed outside the valve seat 10, or may be partially embedded in an opening formed at an end of the valve seat 10 away from the valve port 11. This can increase the abutting area of the nut 20 and the valve seat 10, thereby contributing to the improvement of the stability of the connection of the both and the sealing member. Further, the nut 20 may be sleeved with a connecting piece 22, and the connecting piece 22 may cover the connection between the nut 20 and the valve seat 10, so as to further improve the sealing performance of the connection between the nut 20 and the valve seat 10. The connecting piece 22 and the nut 20 can be embedded into the outer peripheral surface of the nut 20 to realize clamping fixation of the two, and can be fixed with the nut 20 by welding, so as to better connect stability of the two during explosion. In addition, the nut 20 may also be a circular structure, so that the shape is regular and the nut is convenient to machine and form, and meanwhile, the size is relatively small, which is beneficial to reducing the occupied space. The mounting hole 21 of the nut 20 may be a partially threaded hole section, and in this case, the upper end, the middle portion or the lower end of the mounting hole 21 may be formed as a threaded hole section. Of course, the upper end, middle portion or lower end of the mounting hole 21 may be formed as a threaded hole section. One end of the valve needle 30 can be inserted into the mounting hole 21 and is screwed with the mounting hole 21. The valve needle 30 extending into the refrigerant cavity 101 from the mounting hole 21 may be inserted into the valve port 11 to completely close the valve port 11 (i.e., the valve needle 30 is tightly attached to the valve port 11 so that refrigerant cannot pass through) or partially close the valve port 11 (i.e., a gap is formed between the valve needle 30 and the valve port 11 so that a small amount of refrigerant can pass through); and can be separated from the valve port 11 to fully open the valve port 11. The magnetic rotor 40 may be used to provide power to rotate the valve needle 30 relative to the nut 20. Specifically, a coil member may be provided outside the magnet rotor 40, and the magnet rotor 40 may sense the electromagnetic force rotation motion of the coil member. The valve needle 30 and the magnetic rotor 40 are connected to rotate synchronously, and the valve needle is lifted and lowered to and from the valve port 11 under the action of the threaded cooperation between the nut 20 segment of the valve needle 30 and the mounting hole 21 of the nut 20, so that the valve port 11 can be inserted and separated. The magnetic rotor 40 may be a cylindrical structure with an open end, so that the shape of the magnetic rotor is adapted to the rotation track to reduce the possibility of interference during the movement.

When the electronic expansion valve 100 according to the present invention is used, the magnetic rotor 40 senses the electromagnetic rotation of the coil component, and drives the valve needle 30 to rotate relative to the nut 20. Due to the threaded engagement of the valve needle 30 and the nut 20, the valve needle 30 is capable of sliding axially during rotation, i.e. lifting and lowering along the mounting hole 21 towards and away from the valve port 11 on the valve seat 10. So that the valve needle 30 can be inserted into the valve port 11 or separated from the valve port 11, thereby realizing the control of the closing and opening of the electronic expansion valve 100.

In addition, the valve needle 30 of the electronic expansion valve 100 in the present embodiment has a threaded section, so that it can be directly screwed with the nut 20. Compared with the prior art in which the electronic expansion valve 100 drives the valve needle 30 to close and open the valve port 11 through the additional screw rod and the nut 20 in threaded fit, the electronic expansion valve 100 has relatively more parts and relatively more complex structure. The electronic expansion valve 100 in the present embodiment does not need to additionally provide a lead screw to drive the valve needle 30, so that the number of parts of the electronic expansion valve 100 can be reduced, and the structure is relatively simple, thereby being beneficial to reducing the manufacturing cost of the electronic expansion valve 100.

Referring to fig. 1 and fig. 3, in an embodiment of the present invention, in a direction in which the valve needle 30 approaches the valve port 11, the valve needle 30 sequentially includes a first segment 31, a second segment 33, and a third segment 35, the magnetic rotor 40 is sleeved on the first segment 31, an outer circumferential surface of the second segment 33 is a threaded segment, and the third segment 35 is insertable into the valve port 11; the mounting hole 21 sequentially comprises a first hole section 211, a second hole section 213 and a third hole section 215, the second hole section 213 is a threaded hole section, the first section 31 is matched with the first hole section 211, the second section 33 is matched with the second hole section 213, and the third section 35 is matched with the third hole section 215.

It can be understood that, only the outer peripheral surface of the second section of the valve needle 30 is a threaded section, so that the length of the threaded section is not too long, and thus the two are convenient to complete the screwing process quickly, which is beneficial to improving the convenience of installing the valve needle 30. Meanwhile, since the second segment 33 is located at the middle of the valve needle 30, the valve needle 30 and the mounting hole 21 can be connected at a middle position. This contributes to a more uniform distribution of the locking force between the valve needle 30 and the mounting bore 21 over the valve needle 30, which contributes to an improved stability of the mounting of the valve needle 30 as a whole on the nut 20. Of course, it should be noted that the present application is not limited thereto, and in other embodiments, the outer peripheral surface of the first segment 31 may be a threaded segment, and in this case, the first mounting hole 21 may be correspondingly configured as a threaded hole segment. Or, the outer peripheral surfaces of the first segment 31 and the second segment 33 are both threaded sections, and at this time, the first mounting hole 21 and the second mounting hole 21 are both correspondingly provided as threaded hole sections.

Referring to fig. 3, in an embodiment of the invention, the diameter of the first segment 31 is defined as d1, the diameter of the second segment 33 is defined as d2, and the diameter of the third segment 35 is defined as d3, which satisfy the following relation: d1 > d2 > d 3.

It can be understood that, since the diameters of the first, second and third segments 31, 33 and 35 are sequentially reduced (in this case, the diameters of the first, second and third hole sections 211, 213 and 215 are also sequentially reduced), the valve needle 30 can extend one end of the third segment 35 into the refrigerant cavity 101 through the mounting hole 21 from top to bottom, so as to achieve relatively fast mounting. Moreover, the arrangement also enables the valve needle 30 to be inserted into the nut 20 after the nut 20 and the valve seat 10 are installed, thereby avoiding the influence on the subsequent installation of the nut 20 and the valve seat 10 caused by the valve needle 30 being inserted into the nut 20 first. Of course, it should be noted that the present application is not limited thereto, and in other embodiments, the diameter d1 of the first segment 31, the diameter d2 of the second segment 33, and the diameter d3 of the third segment 35 may also be the same. Alternatively, d1 < d2 < d 3.

Referring to fig. 1, fig. 2 and fig. 3, in an embodiment of the present invention, the valve needle 30 further includes an insertion section 37, the insertion section 37 is connected to an end of the third section 35 away from the second section 33, and the diameter of the insertion section 37 is smaller than that of the third section 35 and is insertable into the valve port 11.

It will be appreciated that, since the valve port 11 is generally provided to be relatively small, the valve needle 30 includes the insertion section 37, and the valve needle is inserted into the valve port 11 through the insertion section 37. This allows the diameters of the first, second and third segments 31, 33, 35 of the valve needle 30 to be set relatively large (i.e., larger than the valve port 11) to increase the overall strength of the valve needle 30, thereby facilitating the service life of the valve needle 30. Moreover, when the second segment 33 of the valve pin 30 is relatively large, it is also convenient to form a threaded segment on the valve pin 30, thereby improving the convenience of processing and manufacturing the valve pin. Of course, it should be noted that the present application is not limited thereto, and in other embodiments, when the valve needle 30 does not include the insertion section 37, it is also possible to directly set the diameter of the second section 33 to be relatively small.

Referring to fig. 2, in an embodiment of the present invention, when the insertion section 37 is inserted into the valve port 11, a gap is formed between the insertion section 37 and the valve port 11.

Among them, in some systems, especially in a household air conditioning system with one drive, if the electronic expansion valve 100 fails in a fully closed state, it is easy to cause partial vacuum pumping in the refrigeration circuit, and further damage the compressor and even the entire refrigeration system. Therefore, when the insertion segment 37 is inserted into the valve port 11, a gap is formed between the insertion segment 37 and the valve port 11, so that when the electronic expansion valve is in a closed state, the refrigerant in the refrigerant cavity 101 can still pass through a certain amount through the gap between the insertion segment 37 and the valve port 11, thereby effectively solving the problem of vacuum in a refrigeration system loop caused by the continuous operation of the compressor when the electronic expansion valve 100 is in the closed state. The insertion section 37 may have gaps between the valve port 11 and the insertion section 37 in the circumferential direction, or a gap between the insertion section 37 and the valve port 11. In other embodiments, the insertion section 37 may be inserted into the valve port 11 to completely seal the valve port 11.

Referring to fig. 2, in an embodiment of the present invention, the insertion section 37 includes an equal-diameter section 371 and a tapered section 373, the equal-diameter section 371 is connected to an end of the third section 35 away from the second section 33, the equal-diameter section 371 is insertable into the valve port 11, and a gap is formed between the equal-diameter section 371 and the valve port 11; the tapered section 373 is connected to the end of the constant-diameter section 371 away from the third section 35, the cross-sectional area of the tapered section 373 decreases in the direction in which the valve needle 30 approaches the valve port 11, and a gap is formed between the tapered section 373 and the valve port 11.

It can be understood that the equal-diameter section 371 is disposed such that the insertion section 37 maintains a certain gap with the valve port 11 after being inserted into the valve port 11, thereby achieving that a portion of the refrigerant still passes through the valve port 11 when the electronic expansion valve 100 is in the closed state. The conical section 373 is configured to enable the size of the gap between the valve needle 30 and the valve port 11 to be changed by the conical section 373 during the lifting process of the valve needle 30 driven by the magnetic rotor 40, so as to achieve the adjustment of the flow rate of the valve port 11. Further, the insertion section body 37 further includes a transition section 375, and opposite ends of the transition section 375 are connected to the third section body 35 and the constant diameter section 371, respectively. At this time, since the diameters of the constant diameter section 371 and the tapered section 373 are relatively small, the transition section 375 connected to the third section body 35 can make the diameter of the valve needle 30 change from top to bottom more uniformly, which is beneficial to ensure the uniformity of the strength everywhere. The transition section 375 may have a cylindrical portion and a conical portion in sequence in the direction of the valve needle 30 approaching the valve port 11, and the cross section of the conical portion decreases in the direction of the valve needle 30 approaching the valve port 11. So can make this transition portion have the assurance intensity of certain diameter, have better play transition connection effect. At this time, one end of the mounting hole 21 close to the refrigerant cavity 101 may be flared so as to better correspond to the conical portion of the transition section 375, and also perform a flow guiding function on the refrigerant in the refrigerant cavity 101. Similarly, the end of the mounting hole 21 away from the refrigerant cavity 101 may be flared, so that the refrigerant can flow out faster after passing through the gap between the tapered section 373 of the insertion section 37 and the valve port 11. Of course, the transition section 375 may also be only a cylindrical or conical portion in the direction of the valve needle 30 approaching the valve port 11. Further, the insertion section body 37 may further include a needle section 377, and the needle section 377 is connected to an end tapered away from the constant diameter section 371, so as to prevent the valve pin 30 from being easily damaged by forming a sharp edge at the end. In addition, in other embodiments, the insertion section body 37 may only include the equal-diameter section 371 or the tapered section 373.

Referring to fig. 1, in an embodiment of the present invention, the valve needle 30 further includes a fixing section 39, the fixing section 39 is connected to an end of the first section 31 away from the second section 33, and a diameter of the fixing section 39 is smaller than a diameter of the first section 31; the magnetic rotor 40 is sleeved on the fixed segment 39 and abuts against the surface of the first segment 31 away from the second segment 33.

It can be understood that, since the diameter of the fixed segment 39 is smaller than that of the first segment 31, the surface of the first segment 31 far from the second segment 33 can form a limit step. So locate the fixed segment body 39 with the magnetic rotor 40 cover on, can play spacing supporting role to magnetic rotor 40 through spacing step to be convenient for with accurate the installing in predetermineeing the mounted position of magnetic rotor 40, also can improve the stability of magnetic rotor 40 installation simultaneously. Of course, when the needle 30 does not include the fixed segment 39, the magnetic rotor 40 may be directly sleeved on the first segment 31. In one embodiment, the valve needle 30 may include a fixing section 39, a first section 31, a second section 33, a third section 35, and an inserting section 37, and at this time, the fixing section 39, the first section 31, the second section 33, the third section 35, and the inserting section 37 may be an integral structure, so as to ensure the overall strength of the valve needle 30 and simplify the process for machining the valve needle, thereby improving the production efficiency.

Referring to fig. 1, in an embodiment of the present invention, a magnetic rotor 40 includes a magnetic body 41 and a position-limiting plate 43, where the magnetic body 41 has a cylindrical structure with openings at two ends; the limit plate 43 is connected to the inner sidewall of the magnet body 41 and is sleeved on the needle 30 outside the refrigerant cavity 101, and the magnet body 41 drives the needle 30 to rotate relative to the nut 20 through the limit plate 43.

It can be understood that the magnet rotor 40 is composed of the magnet body 41 and the position limiting plate 43, so that the magnet body 41 and the position limiting plate 43 can be separately manufactured first and then assembled into a whole after being molded respectively, thereby facilitating the convenience of processing and manufacturing the magnet rotor. The position limiting plate 43 may be a circular structure and is embedded into the inner peripheral surface of the magnet body 41 to achieve clamping fixation. When the valve needle 30 only includes the first segment 31, the second segment 33 and the third segment 35, the limiting plate 43 may be sleeved on the first segment 31. When the valve needle 30 further includes the fixed segment 39, the limiting plate 43 may be sleeved on the fixed segment 39. In addition, in another embodiment, the magnetic rotor 40 includes a magnetic body 41 and a connecting rod, the magnetic body 41 is sleeved on the needle 30, and the connecting rod may connect the needle 30 and the magnetic body 41.

Referring to fig. 1, in an embodiment of the present invention, a guide rail 23 is disposed on an outer side wall of the nut 20, the guide rail 23 extends spirally in a direction in which the valve needle 30 approaches the valve port 11, the electronic expansion valve 100 further includes a sliding member 60, a portion of the sliding member 60 is embedded in the guide rail 23 and can slide along an extending direction of the guide rail 23; the magnetic rotor 40 further comprises an abutting piece 45, the abutting piece 45 is connected to the limit plate 43, and when the magnetic rotor 40 drives the needle 30 to rotate relative to the nut 20, the abutting piece 45 abuts to drive the sliding piece 60.

It can be understood that the sliding member 60 can be driven by the abutting member 45 in the rotating process of the magnetic rotator, and the stroke of the guide rail 23 has an upper limit and a lower limit, so that the sliding member 60 also has an upper limit position and a lower limit position in the lifting process along the set guide rail 23. At this time, the control of the lifting stroke of the needle 30 by the magnetic rotor 40 is correspondingly realized. The abutting member 45 may include a connection plate 451 and an abutting plate 453, wherein the connection plate 451 is sleeved on the fixed segment 39 of the needle 30 and connected to the lower surface of the limit plate 43; the connection plate 451 is connected to the stopper plate 43 and extends in a direction of the valve needle 30 toward the valve port 11. Thus, when the abutting piece 45 is installed, the needle can be directly sleeved on the needle 30 and then further limited and fixed, so that the convenience of installation and the stability of installation abutting are improved.

Referring to fig. 1 and fig. 4, in an embodiment of the present invention, the electronic expansion valve 100 further includes a spring 50, the spring 50 is sleeved on the nut 20 and forms a guide rail 23 with the nut 20; the sliding member 60 includes a ring body 51 and an extension rod 53, the ring body 51 is disposed spirally and is located in the guide rail 23, and the extension rod 53 is connected to the ring body 51 and can be driven by the abutting member 45.

It will be appreciated that the formation of the rail 23 by the cooperation of the spring 50 and the nut 20 eliminates the need to form the rail 23 directly on the outer peripheral surface of the nut 20, thereby simplifying the complexity of forming the rail 23. The spring 50 and the nut 20 may be fixed by being clamped, that is, the nut 20 may be provided with a clamping groove 25 for inserting one end of the spring 50. Of course, it is also possible to weld the spring 50 directly to the nut 20. In other embodiments, the guide rail 23 may be formed by directly forming a spiral groove in the nut 20.

Referring to fig. 1, in an embodiment of the present invention, the electronic expansion valve 100 further includes a housing 70, the housing 70 is a cylindrical structure with one end open, the housing 70 is connected to the valve seat 10 and covers the nut 20, the valve needle 30 and the magnetic rotor 40.

It can be understood that the nut 20, the valve needle 30 and the magnetic rotor 40 can be covered by the cover 70, that is, the nut 20, the valve needle 30 and the magnetic rotor 40 can be shielded and protected to reduce the possibility of damage, thereby being beneficial to prolonging the service life of the nut 20, the valve needle 30 and the magnetic rotor 40. Wherein, the outer cover 70 and the valve seat 10 can be fixed by welding to improve the stability of the connection between the two. Of course, the present application is not limited thereto, and in other embodiments, the cover 70 and the valve seat 10 may be connected by screws or snap-fit connection.

Referring to fig. 1, in an embodiment of the present invention, the electronic expansion valve 100 further includes a refrigerant inlet pipe 80 and a refrigerant outlet pipe 90, the refrigerant inlet pipe 80 is communicated with the refrigerant cavity 101, and the refrigerant outlet pipe 90 is communicated with the valve port 11.

It can be understood that the arrangement of the refrigerant inlet pipe 80 and the refrigerant outlet pipe 90 provides a connection position for connecting with an external pipe body on the electronic expansion valve 100, thereby facilitating the installation of the electronic expansion valve 100 on a pipeline. The refrigerant inlet pipe 80 and the refrigerant outlet pipe 90 may be welded to the valve seat 10, so as to improve the sealing property and the connection stability at the connection. Of course, the present invention is not limited thereto, and in other embodiments, the refrigerant inlet pipe 80 and the refrigerant outlet pipe 90 may be connected to the valve seat 10 by a snap connection or a screw connection.

The above description is only a preferred 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 (12)

1. An electronic expansion valve, comprising:

a valve seat;

the nut is fixedly connected to the valve seat and forms a refrigerant cavity by enclosing with the valve seat, the nut is provided with a mounting hole communicated with the refrigerant cavity, at least part of the mounting hole is a threaded hole section, and the valve seat is provided with a valve port communicated with the refrigerant cavity;

the valve needle is provided with a thread section on the outer peripheral surface, extends into the refrigerant cavity from the mounting hole and is in threaded connection with the mounting hole; and

the magnetic rotor is sleeved on the valve needle outside the refrigerant cavity and can drive the valve needle to rotate relative to the nut, so that the valve needle can lift in the mounting hole and is inserted into the valve port or is separated from the valve port.

2. The electronic expansion valve according to claim 1, wherein the valve needle comprises a first segment, a second segment and a third segment in sequence in a direction in which the valve needle approaches the valve port, the magnetic rotor is sleeved on the first segment, an outer circumferential surface of the second segment is a threaded segment, and the third segment is insertable into the valve port;

the mounting hole includes first hole section, second hole section and third hole section in proper order, the second hole section is the screw hole section, the first section body with first hole section cooperatees, the second section body with second hole section cooperatees, the third section body with third hole section cooperatees.

3. The electronic expansion valve of claim 2, wherein the diameter of the first segment is defined as d1, the diameter of the second segment is defined as d2, and the diameter of the third segment is defined as d3, satisfying the relationship: d1 > d2 > d 3.

4. The electronic expansion valve of claim 2, wherein the valve needle further comprises an insertion section, the insertion section is connected to an end of the third section away from the second section, and the insertion section has a diameter smaller than that of the third section and is insertable into the valve port.

5. The electronic expansion valve of claim 4, wherein when the insertion section is inserted into the valve port, there is a gap between the insertion section and the valve port.

6. The electronic expansion valve of claim 5, wherein the insert segment comprises:

the constant-diameter section is connected to one end, far away from the second section body, of the third section body, the constant-diameter section can be inserted into the valve port, and a gap is formed between the constant-diameter section and the valve port; and

the conical section is connected to one end, far away from the third section body, of the constant-diameter section, the area of the cross section of the conical section is reduced in the direction that the valve needle is close to the valve port, and a gap is formed between the conical section and the valve port.

7. The electronic expansion valve of claim 2, wherein the valve needle further comprises a fixed segment connected to an end of the first segment remote from the second segment, the fixed segment having a diameter smaller than a diameter of the first segment;

the magnetic rotor is sleeved on the fixed section body and is abutted against the surface of the first section body, which is far away from the second section body.

8. The electronic expansion valve of any of claims 1 to 7, wherein the magnetic rotor comprises:

the magnetic body is of a cylindrical structure with openings at two ends; and

the limiting plate is connected to the inner side wall of the magnetic body and sleeved on the valve needle located outside the refrigerant cavity, and the magnetic body drives the valve needle to rotate relative to the nut through the limiting plate.

9. The electronic expansion valve according to claim 8, wherein an outer sidewall of the nut is provided with a guide rail extending spirally in a direction in which the valve needle approaches the valve port, and the electronic expansion valve further comprises a sliding member, a portion of the sliding member being embedded in the guide rail and being slidable along an extending direction of the guide rail;

the magnetic rotor further comprises a butting part, the butting part is connected to the limiting plate, and the butting part butts and drives the sliding part when the valve needle is driven by the magnetic rotor to rotate relative to the nut.

10. The electronic expansion valve of claim 9, further comprising a spring, wherein the spring is sleeved on the nut and encloses with the nut to form a guide rail;

the slider includes ring body and extension rod, the ring body is the heliciform setting, and is located in the guide rail, the extension rod connect in the ring body, and can by the butt piece butt drives.

11. The electronic expansion valve according to any one of claims 1 to 7, further comprising a cover having a cylindrical structure with one end open, the cover being connected to the valve seat and covering the nut, the valve needle, and the magnetic rotor;

and/or, the electronic expansion valve further comprises a refrigerant inlet pipe and a refrigerant outlet pipe, the refrigerant inlet pipe is communicated with the refrigerant cavity, and the refrigerant outlet pipe is communicated with the valve port.

12. Refrigeration device, comprising an electronic expansion valve according to any of claims 1 to 11.

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