Electric valve and refrigeration equipment

Abstract

The utility model discloses an electrically operated valve and refrigeration equipment, and relates to the technical field of refrigeration control, the electrically operated valve comprises a valve body, a rotor assembly and a nut assembly, the valve body is provided with a valve cavity and a valve port communicated with the valve cavity; the rotor assembly comprises a rotor and a lead screw fixedly connected to the rotor. The nut assembly comprises a nut and a valve element. The other end of the nut is in threaded fit with the lead screw. The length of the internal thread of the nut is set to be larger than that of the external thread of the lead screw, so that when the valve element is located at the upper limit position and the lower limit position, the external thread of the lead screw is completely meshed with the internal thread of the nut, and the effects of stable thread transmission and even abrasion are kept in the whole stroke. The rotor and the lead screw are axially positioned, the valve element is driven to move only through the nut, axial displacement of the rotor is avoided, and electromagnetic force is kept consistent in the whole opening and closing stroke. Due to the fact that the nut is long and the effective thread of the lead screw is short, the lead screw is more compact in structure, easier to manufacture and higher in coaxiality and strength.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration control technology, and in particular to an electric valve and a refrigeration device. Background Technology

[0002] In traditional electric valve structures, electromagnetic drive is typically used to open and close the valve. Specifically, when a coil is energized, it generates a magnetic field that drives a magnetic rotor to rotate. This magnetic rotor is connected to a lead screw and a fixed nut via a threaded drive mechanism. As the magnetic rotor rotates, it drives the lead screw to move axially, thus achieving the linear reciprocating motion of the valve core assembly to open or close the valve. However, in this design, because the magnetic rotor participates in the threaded drive and generates axial displacement during rotation, its relative position to the coil changes. Especially with long strokes, the magnetic rotor may exceed the effective electromagnetic field of the coil, causing axial misalignment between the two.

[0003] This axial misalignment significantly reduces the efficiency of the electromagnetic driving force output from the coil to the magnetic rotor, affecting the driving capability and response performance of the electric valve. When the magnetic rotor moves away from the effective range of the coil, the electromagnetic force weakens significantly, potentially leading to drive failure, thus limiting the opening and closing stroke range and control accuracy of the electric valve. Therefore, how to improve the existing electromagnetic drive structure of electric valves to achieve stable drive with a larger stroke has become a key technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] The main objective of this invention is to provide an electric valve and a refrigeration device, which aims to provide an electric valve capable of stable drive with a larger stroke.

[0005] To achieve the above objectives, the electric valve proposed in this utility model includes:

[0006] The valve body has a valve cavity and a valve port communicating with the valve cavity;

[0007] The rotor assembly includes a rotor rotatably mounted inside the valve chamber and a lead screw fixedly connected to the rotor;

[0008] A nut assembly includes a nut and a valve core connected to one end of the nut. The other end of the nut is threaded into a lead screw. When the lead screw rotates, the nut can drive the valve core to move along its axial direction in a direction close to and away from the valve port, so as to have a lower limit position for closing the valve port and an upper limit position away from the valve port.

[0009] The length of the internal thread of the nut is set to be greater than the length of the external thread of the lead screw. At both the upper limit position and the lower limit position, the external thread of the lead screw is fully engaged with the internal thread of the nut.

[0010] In one embodiment, the lead screw includes a plurality of rod segments, the plurality of rod segments including a first rod segment, a second rod segment and a third rod segment arranged sequentially in the direction near the valve port;

[0011] The rotor assembly also includes:

[0012] A fixed plate connects the rotor and the lead screw. The fixed plate has a connecting hole through which the first rod segment passes to connect with the fixed plate.

[0013] A bearing assembly is fixedly connected to the valve body, and the bearing assembly is sleeved around the second rod segment;

[0014] The third rod segment is threadedly engaged with the nut. The third rod segment includes a clearance section and a mating section arranged sequentially in the direction close to the valve port. The mating section is provided with the external thread.

[0015] In one embodiment, the length of the mating section is a, the length of the clearance section is b, and the length of the internal thread of the nut is c, where a+b>c>a.

[0016] In one embodiment, the lead screw further includes a plurality of limiting protrusions protruding from the side wall of the lead screw, the plurality of limiting protrusions including:

[0017] A first limiting protrusion, disposed between the first rod segment and the second rod segment, is used to axially limit the movement of the fixing plate; and...

[0018] The second limiting protrusion is provided between the second rod segment and the third rod segment, and is used to limit the bearing axially.

[0019] In one embodiment, the diameter of the first rod segment is D1, the diameter of the second rod segment is D2, and the diameter of the third rod segment is D3, where D1 < D2 < D3.

[0020] In one embodiment, the plurality of rod segments further includes a guide segment disposed at one end of the third rod segment away from the second rod segment, and the diameter of the guide segment is set to be smaller than the diameter of the third rod segment.

[0021] In one embodiment, the first rod segment is welded to the fixing plate; and / or,

[0022] The second rod segment is welded to the bearing assembly.

[0023] In one embodiment, the valve body includes a lower valve seat, an upper valve seat, and a housing that together enclose the valve cavity. The lower valve seat has a first end and a second end that are disposed opposite to each other. The first end of the upper valve seat is provided with the lower valve seat, and the second end is provided with the housing. The lower valve seat is provided with the valve port, and the rotor assembly is disposed inside the housing.

[0024] The upper valve seat is provided with guide holes extending through both ends thereto, and the valve core is movably disposed along the guide holes.

[0025] In one embodiment, the valve core has a recessed receiving groove at the end opposite to the valve port;

[0026] The nut assembly also includes:

[0027] A pressure plate is provided on the opening of the receiving groove. The pressure plate has a through hole communicating with the receiving groove. The nut passes through the through hole. A stop protrusion is provided on the outer side wall of the nut at one end inside the receiving groove, and the stop protrusion is used to limit the axial movement of the nut; and...

[0028] A spring is disposed within the receiving groove and located at the end of the nut near the valve port. The spring is used to provide a counterforce when the nut moves toward the valve port.

[0029] In one embodiment, the outer peripheral wall of the valve core is provided with a first annular step portion and a second step portion along its circumference, the second step portion being located on the side of the first step portion away from the valve port and extending through the end of the valve core;

[0030] The nut assembly further includes a sealing ring and an annular pressure sleeve. The sealing ring is supported on the first stepped portion, and the annular pressure sleeve is at least partially supported on the second stepped portion. The annular pressure sleeve is laterally protruding from the second stepped portion to form a sealing groove between itself and the first annular stepped portion for the sealing ring to be received.

[0031] This utility model provides a refrigeration device, the refrigeration device including an electric valve, the electric valve comprising:

[0032] The valve body has a valve cavity and a valve port communicating with the valve cavity;

[0033] The rotor assembly includes a rotor rotatably mounted inside the valve chamber and a lead screw fixedly connected to the rotor;

[0034] A nut assembly includes a nut and a valve core connected to one end of the nut. The other end of the nut is threaded into a lead screw. When the lead screw rotates, the nut can drive the valve core to move along its axial direction in a direction close to and away from the valve port, so as to have a lower limit position for closing the valve port and an upper limit position away from the valve port.

[0035] The length of the internal thread of the nut is set to be greater than the length of the external thread of the lead screw. At both the upper limit position and the lower limit position, the external thread of the lead screw is fully engaged with the internal thread of the nut.

[0036] In one embodiment, the refrigeration equipment includes an air conditioner.

[0037] In the technical solution of this utility model, by setting the internal thread length of the nut to be greater than the external thread length of the lead screw, the external thread of the lead screw is fully engaged with the internal thread of the nut when the valve core is at both the upper and lower limit positions, achieving the effect of maintaining smooth thread transmission and uniform wear throughout the entire stroke. By positioning the rotor and lead screw axially, the valve core is moved only by the nut, thus avoiding axial displacement of the rotor and lead screw, keeping the electromagnetic force consistent throughout the entire opening and closing stroke, improving drive stability and valve control accuracy. By setting the nut to be longer and the effective thread of the lead screw to be shorter, the lead screw structure is more compact, easier to manufacture, and has higher coaxiality and strength, which is beneficial to improving assembly accuracy and product reliability. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0039] Figure 1 A schematic diagram of an embodiment of the electric valve provided by this utility model;

[0040] Figure 2 for Figure 1 Schematic diagram of the lead screw;

[0041] Figure 3 and Figure 4 Dimensional diagram of the lead screw;

[0042] Figure 5 for Figure 1 Schematic diagram of the structure of the middle nut;

[0043] Figure 6 for Figure 1 Assembly diagram of the lead screw and nut;

[0044] Figure 7 for Figure 1 Assembly diagram of the middle rotor assembly and the upper valve seat;

[0045] Figure 8 for Figure 1 Assembly diagram of the rotor assembly and nut assembly.

[0046] Explanation of icon numbers:

[0047] 100. Electric valve; 1. Valve body; a. Valve cavity; b. Valve port; 11. Lower valve seat; 12. Upper valve seat; 12a. Guide hole; 13. Housing; 20. Rotor assembly; 21. Rotor; 22. Lead screw; 221. First rod section; 222. Second rod section; 223. Third rod section; 2231. Clearance section; 2232. Fitting section; 224. First limiting protrusion; 225. Second limiting protrusion; 226. Guide section; 23. Fixing plate; 24. Bearing assembly; 30. Nut assembly; 31. Nut; 311. Stop protrusion; 32. Valve core; 32a. Receiving groove; 33. Pressure plate; 33a. Through hole; 34. Spring; 35. Sealing ring; 36. Annular pressure sleeve.

[0048] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0049] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0050] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0051] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0052] In related technologies, because the magnetic rotor participates in the threaded drive and generates axial displacement during rotation, the relative position of the magnetic rotor and the coil changes. Especially when the stroke is long, the magnetic rotor may exceed the effective electromagnetic field of the coil, causing axial misalignment between the two. When the magnetic rotor moves away from the effective range of the coil, the electromagnetic force weakens significantly, and may even lead to drive failure, thus limiting the opening and closing stroke range and control accuracy of the electric valve.

[0053] This utility model proposes an electric valve, aiming to provide an electric valve that can achieve stable drive with a larger stroke.

[0054] Please see Figure 1 and Figure 6 In one embodiment of this utility model, the electric valve 100 includes a valve body 1, a rotor assembly 20, and a nut assembly 30. The valve body 1 has a valve cavity a and a valve port b communicating with the valve cavity a. The rotor assembly 20 includes a rotor 21 rotatably mounted in the valve cavity a and a lead screw 22 fixedly connected to the rotor 21. The nut assembly 30 includes a nut 31 and a valve core 32 connected to one end of the nut 31. The other end of the nut 31 is threadedly engaged with the lead screw 22. When the lead screw 22 rotates, the nut 31 can drive the valve core 32 to move along its axial direction in directions close to and away from the valve port b, so as to have a lower limit position closing the valve port b and an upper limit position away from the valve port b. The length of the internal thread of the nut 31 is set to be greater than the length of the external thread of the lead screw 22. At the upper limit position and the lower limit position, the external thread of the lead screw 22 is fully engaged with the internal thread of the nut 31.

[0055] It is understood that the electric valve 100 comprises three main parts: a valve body 1, a rotor assembly 20, and a nut assembly 30. The valve body 1 has a valve cavity a and a valve port b communicating with the valve cavity a. The rotor assembly 20 includes a magnetic rotor 21 rotatably mounted within the valve cavity a and a lead screw 22 fixedly connected to one end of the rotor 21. The lead screw 22 and the rotor 21 rotate synchronously via a fixing plate 23 and are axially positioned by bearings to ensure a stable coaxial state during operation. The nut assembly 30 includes a nut 31 and a valve core 32 fixedly connected to one end of the nut 31. The other end of the nut 31 forms a threaded drive engagement with the lead screw 22.

[0056] During operation, the electric valve 100 drives the magnetic rotor 21 to rotate via a coil, which in turn drives the lead screw 22, which is fixedly connected to it, to rotate synchronously. The lead screw 22 and the nut 31 are connected by a threaded drive. The nut 31 is designed to move only axially and not rotate. Therefore, when the lead screw 22 rotates, the nut 31 will be displaced axially, causing the valve core 32 connected to it to move together, thereby opening and closing the valve. In this process, both the lead screw 22 and the rotor 21 only rotate without axial displacement, ensuring that the rotor 21 is always within the effective electromagnetic field generated by the coil. This avoids the axial misalignment problem between the rotor 21 and the coil caused by axial movement in traditional structures.

[0057] Since the rotor 21 and the lead screw 22 remain axially fixed during operation, their relative positions with the coil are always consistent, thus ensuring that the electromagnetic driving force remains stable throughout the entire valve opening and closing stroke, and that the electromagnetic force does not weaken as the rotor 21 moves away from the coil.

[0058] It should be noted that in related technologies, the thread engagement length between the lead screw 22 and the nut 31 of the electric valve 100 changes during the valve opening or closing stroke, resulting in problems such as unstable transmission, uneven wear, and limited stroke. This invention addresses this by making the internal thread length of the nut 31 greater than the external thread length of the lead screw 22. When the valve core 32 is in its upper limit position (fully open) or lower limit position (fully closed), the external thread of the lead screw 22 always maintains full engagement with the internal thread of the nut 31. This ensures that the thread engagement area between the lead screw 22 and the nut 31 remains stable throughout the entire opening and closing stroke, not only avoiding the problems of contact stress concentration and increased local wear caused by changes in thread engagement length with stroke in traditional structures, but also improving the smoothness and reliability of the transmission.

[0059] Furthermore, in traditional structures, in order to achieve a longer stroke, the lead screw 22 usually needs to be designed to be longer and to mate with a shorter nut 31. This not only increases the difficulty of manufacturing the lead screw 22, but also places higher demands on the coaxiality of the lead screw 22. In particular, in long-stroke applications, bending deformation or accumulation of assembly errors are likely to occur.

[0060] This invention designs the nut 31 as a hollow tubular structure with a relatively long internal thread, which not only meets the thread engagement length required for a large stroke, but also offers advantages in terms of material usage and strength due to its hollow structure. Meanwhile, the lead screw 22 only needs a shorter effective external thread length to meet the full engagement requirement, thus shortening its overall length, facilitating manufacturing, and improving its coaxiality and assembly accuracy, thereby enhancing the operational stability and service life of the entire electric valve 100.

[0061] In this invention, by setting the internal thread length of the nut 31 to be greater than the external thread length of the lead screw 22, the external thread of the lead screw 22 is fully engaged with the internal thread of the nut 31 when the valve core 32 is at its upper and lower limit positions, achieving smooth thread transmission and uniform wear throughout the entire stroke. By positioning the rotor 21 and the lead screw 22 axially, the valve core 32 is moved only by the nut 31, thus preventing axial displacement of the rotor 21 and the lead screw 22. This ensures that the electromagnetic force remains consistent throughout the opening and closing stroke, improving drive stability and valve control accuracy. By setting the nut 31 to be longer and the effective thread of the lead screw 22 to be shorter, the lead screw 22 structure is more compact, easier to manufacture, and has higher coaxiality and strength, which is beneficial to improving assembly accuracy and product reliability. This effectively solves the problems of limited electromagnetic force range, uneven thread wear, and unstable transmission existing in traditional structures.

[0062] Specifically, please refer to Figures 2 to 4 In this embodiment, the lead screw 22 includes multiple rod segments, including a first rod segment 221, a second rod segment 222, and a third rod segment 223 arranged sequentially in the direction near the valve port b; the rotor assembly 20 also includes a fixing plate 23 and a bearing assembly 24. The fixing plate 23 connects the rotor 21 and the lead screw 22, and the fixing plate 23 is provided with a connecting hole. The first rod segment 221 passes through the connecting hole to connect with the fixing plate 23; the bearing assembly 24 is fixedly connected to the valve body 1, and the bearing assembly 24 is sleeved around the second rod segment 222; the third rod segment 223 is threadedly engaged with the nut 31, and the third rod segment 223 includes a clearance section 2231 and a mating section 2232 arranged sequentially in the direction near the valve port b. The mating section 2232 is provided with the external thread.

[0063] It is understood that the electric valve 100 in this embodiment has a functional partition design for the lead screw 22. Specifically, the lead screw 22 includes multiple segments, namely a first segment 221, a second segment 222, and a third segment 223 arranged sequentially along the direction near the valve port b. The first segment 221 passes through the connecting hole on the fixing plate 23 and is rigidly connected to the rotor 21 through the fixing plate 23, ensuring that the rotor 21 can drive the lead screw 22 to rotate synchronously when it rotates. The second segment 222 is provided with a bearing assembly 24 on its periphery. 4 is fixed inside the valve body 1 to support the lead screw 22 and enable its stable rotation; the third rod section 223 forms a threaded transmission engagement with the nut 31 to drive the valve core 32 to move. The third rod section 223 is further divided into a clearance section 2231 and a mating section 2232. The clearance section 2231 is located on the side of the mating section 2232 away from the valve port b and does not participate in the threaded engagement. It only serves as a space clearance area during stroke movement. The mating section 2232 is provided with an external thread that engages with the internal thread of the nut 31 to enable the nut 31 to reciprocate along the axial direction.

[0064] By dividing the lead screw 22 into multiple segments with different functions, each segment undertakes the functions of positioning connection, rotation support and thread transmission, which not only achieves a reasonable division of labor in the structure, but also helps to improve the overall assembly accuracy and operational stability.

[0065] Specifically, to ensure that the lead screw 22 and nut 31 remain effectively engaged throughout the entire stroke range, while also considering the space requirements of the clearance section 2231, please refer to [link / reference needed]. Figure 3 and Figure 5 In this embodiment, the length of the mating section 2232 is a, the length of the clearance section 2231 is b, and the internal thread length of the nut 31 is c, where a+b>c>a.

[0066] Through the design of the above-mentioned dimensional relationship, as the nut 31 moves from the upper limit position (away from valve port b) to the lower limit position (close to valve port b), the nut 31 always maintains a partial or complete engagement with the mating section 2232 of the lead screw 22. Even when the nut 31 is close to the end of its stroke, its internal thread can still cover all the external threads of the mating section 2232, thereby ensuring continuous and stable transmission and avoiding disengagement or jamming due to insufficient engagement length. At the same time, the existence of the clearance section 2231 provides the necessary clearance space for the extreme position of the nut 31, preventing mechanical interference, reducing wear, and improving smooth operation.

[0067] Further, please refer to Figure 2In this embodiment, the lead screw 22 further includes a plurality of stop protrusions 311 protruding from the side wall of the lead screw 22. The plurality of stop protrusions 311 include: a first limiting protrusion 224 and a second limiting protrusion 225. The first limiting protrusion 224 is disposed between the first rod segment 221 and the second rod segment 222 and is used to axially limit the fixed plate 23. The second limiting protrusion 225 is disposed between the second rod segment 222 and the third rod segment 223 and is used to axially limit the bearing.

[0068] Understandably, the first limiting protrusion 224 is located between the first rod segment 221 and the second rod segment 222 to axially limit the fixing plate 23, ensuring that it can be accurately positioned in the designated position of the lead screw 22 during assembly, and avoiding the impact of displacement or loosening on transmission stability; the second limiting protrusion 225 is located between the second rod segment 222 and the third rod segment 223 to axially limit the bearing assembly 24, so that the bearing maintains a stable position after installation, and the reliable fixing of each component can be achieved without the need for additional positioning snap rings, washers or other limiting tooling.

[0069] By directly setting the stop protrusion 311 on the side wall of the lead screw 22, not only is the overall structural design simplified, but assembly efficiency and accuracy are also improved. Since the stop protrusion 311 is integrated on the body of the lead screw 22, the additional parts or special tooling used for axial positioning in the traditional structure are eliminated, reducing the number of parts and assembly complexity, while also reducing running deviation or wear problems caused by inaccurate positioning.

[0070] Specifically, please refer to Figure 4 In this embodiment, the diameter of the first rod segment 221 is D1, the diameter of the second rod segment 222 is D2, and the diameter of the third rod segment 223 is D3, where D1 < D2 < D3.

[0071] In this embodiment, the electric valve 100 employs a stepped design for the diameters of each segment of the lead screw 22. Specifically, the lead screw 22 includes a first segment 221, a second segment 222, and a third segment 223, with diameters D1, D2, and D3 respectively, satisfying the relationship D1 < D2 < D3. That is, the outer diameter of the lead screw 22 gradually increases from the end closer to the rotor 21 to the end farther away from the rotor 21. This not only facilitates the orderly assembly of various functional components but also improves the stability and fitting accuracy of the overall structure.

[0072] During assembly, the lead screw 22 first uses its second segment 222 (with a larger diameter) to install the bearing assembly 24. Because this segment's diameter is larger than the first segment 221, it facilitates a tighter fit with the bearing and improves the rigidity of the rotational support. Subsequently, the first segment 221, with a smaller diameter, passes through the connecting hole on the fixing plate 23, enabling precise alignment and connection with the rotor 21. Finally, the third segment 223, with its largest diameter portion, forms a threaded drive fit with the nut 31, ensuring transmission strength while also improving the load-bearing capacity and bending resistance of the threaded pair. This gradual increase in diameter distribution makes the assembly sequence between the lead screw 22, bearing, fixing plate 23, and nut 31 more rational, avoiding assembly interference and improving assembly efficiency and product consistency.

[0073] Furthermore, for easier screwing with nut 31, please refer to... Figure 2 In this embodiment, the plurality of rod segments further includes a guide segment 226, which is disposed at the end of the third rod segment 223 away from the second rod segment 222, and the diameter of the guide segment is set to be smaller than the diameter of the third rod segment 223.

[0074] The guide section 226 is located at the end of the third rod section 223 away from the second rod section 222, and its diameter is smaller than that of the third rod section 223, forming a guide structure with a reduced front diameter. This guide section 226 plays a preliminary centering and guiding role during assembly. When the nut 31 is axially fitted onto the lead screw 22, the guide section 226 first enters the inner hole of the nut 31. Its smaller outer diameter forms a smooth guide fit with the inner wall of the nut 31, thereby guiding the nut 31 to accurately align and engage with the threaded section of the lead screw 22, avoiding assembly jamming or thread damage due to initial positional deviation or angular misalignment.

[0075] By setting a guide section 226 at the end of the lead screw 22, not only is the smoothness of the assembly process and the efficiency of operation improved, but also the excessive requirements for assembly accuracy are reduced, and the rework or scrap rate caused by improper assembly is reduced. At the same time, the guide structure does not require additional independent guide components and is directly integrated into the lead screw 22 body. The structure is simple and easy to manufacture, which is conducive to improving the overall assembly quality and product consistency.

[0076] Specifically, in order to achieve a stable connection between the lead screw 22, the fixed plate 23, and the bearing assembly 24, in this embodiment, the first rod segment 221 is welded to the fixed plate 23; and / or, the second rod segment 222 is welded to the bearing assembly 24.

[0077] The first rod segment 221 is fixedly connected to the fixed plate 23 by welding, ensuring sufficient connection strength and transmission stability when the rotor 21 drives the lead screw 22 to rotate synchronously through the fixed plate 23. At the same time, the second rod segment 222 can also be selectively fixed to the bearing assembly 24 by welding to enhance the axial and radial positioning reliability of the bearing assembly 24 on the lead screw 22, prevent it from loosening or shifting during operation, and thus improve the rigidity and smooth operation of the overall structure.

[0078] Further, please refer to Figure 7 and Figure 8 In this embodiment, the valve body 1 includes a lower valve seat 11, an upper valve seat 12, and a housing 13 that together enclose the valve cavity a. The lower valve seat 11 has a first end and a second end that are arranged opposite to each other. The first end of the upper valve seat 12 is provided with the lower valve seat 11, and the second end is provided with the housing 13. The valve port b is provided on the lower valve seat 11. The rotor assembly 20 is disposed inside the housing 13. The upper valve seat 12 is provided with a guide hole 12a that passes through both ends thereto. The valve core 32 is movably disposed along the guide hole 12a.

[0079] In this embodiment, the electric valve 100 adopts a combined structure in its valve body 1, consisting of a lower valve seat 11, an upper valve seat 12, and a housing 13, forming a valve cavity a. The lower valve seat 11 has a first end and a second end arranged opposite to each other, with a valve port b for controlling fluid flow. The first end of the upper valve seat 12 is connected to the lower valve seat 11, and the second end is fixedly connected to the housing 13, thereby accommodating the rotor assembly 20 within the housing 13 and achieving protection and sealing of the drive component. The upper valve seat 12 also has guide holes 12a extending through both ends, which provide a precise axial movement path for the valve core 32, enabling the valve core 32 to move stably in a straight line during opening and closing, avoiding impact on sealing performance or wear due to skewness or shaking.

[0080] By designing the upper valve seat 12 as a composite component that not only undertakes the function of sealing the valve cavity a, but also serves as a guide and mating part for the valve core 32, and has both structural connection and guiding functions, the overall structural layout is simplified, the smoothness of the valve core 32's movement and the guiding accuracy are improved, the number of parts is reduced, and the assembly efficiency is increased.

[0081] Further, please refer to Figure 8In this embodiment, the valve core 32 has a recessed receiving groove 32a at one end away from the valve port b; the nut assembly 30 also includes a pressure plate 33 and a spring 34. The pressure plate 33 covers the opening of the receiving groove 32a. The pressure plate 33 has a through hole 33a communicating with the receiving groove 32a. The nut 31 passes through the through hole 33a. The outer side wall of the nut 31 located inside the receiving groove 32a has a stop protrusion 311. The stop protrusion 311 is used to limit the axial movement of the nut 31 and is movable relative to the valve core 32. The spring 34 is located inside the receiving groove 32a and at the end of the nut 31 near the valve port b. The spring 34 is used to provide a reverse force when the nut 31 moves towards the valve port b.

[0082] Understandably, a receiving groove 32a is recessed at the end of the valve core 32 away from the nut 31, and a through hole 33a is formed through the bottom of the receiving groove 32a for the nut 31 to pass through. After the nut 31 passes through the through hole 33a, a stop protrusion 311 is provided on the outer wall of the end of the nut 31 located in the receiving groove 32a. The stop protrusion 311 serves to limit the axial movement range of the nut 31 on the valve core 32, and allows the nut 31 to undergo axial displacement relative to the valve core 32 within a certain range.

[0083] In addition, the valve core 32 assembly also includes a spring 34 and a limiting sleeve. The spring 34 is disposed between the limiting sleeve and the nut 31 and is located inside the receiving groove 32a. When the nut 31 drives the valve core 32 to move toward the valve port b and completes the closing action, the spring 34 is compressed to store elastic potential energy and applies a force to the nut 31 that is always toward the valve port b, so that the valve core 32 can fit more tightly against the periphery of the valve port b and improve the sealing performance.

[0084] This structural design is particularly suitable for applications of the electric valve 100 in high-temperature environments. In the prior art, when the electric valve 100 is in the closed state and experiences a high-temperature environment, the valve port b (usually made of plastic material) may expand due to heat and push the valve core 32 assembly upward, causing a small gap to appear in the originally closed valve port b. After the temperature returns to normal, the valve port b material shrinks, but at this time, due to the gap between the threaded pair between the lead screw 22 and the nut 31, the valve core 32 assembly may not be able to automatically return to the initial closed position, causing problems such as poor sealing or even leakage.

[0085] In this invention, since the spring 34 is always in a compressed state during the closing process of the valve core 32 assembly, it can provide continuous preload under any temperature change conditions. This not only helps to enhance the sealing pressure between the valve core 32 and the valve port b under normal conditions, but also automatically compensates for the displacement deviation caused by the threaded pair clearance through the elastic restoring force of the spring 34 after high temperature retraction, so that the valve core 32 always maintains good contact with the periphery of the valve port b, ensuring stable and reliable sealing performance.

[0086] Further, please refer to Figure 8 In this embodiment, the outer peripheral wall of the valve core 32 is provided with a first annular step portion and a second step portion along its circumference. The second step portion is located on the side of the first step portion away from the valve port b and is provided through the end of the valve core 32. The nut assembly 30 also includes a sealing ring 35 and an annular pressure sleeve 36. The sealing ring 35 is supported on the first step portion, and the annular pressure sleeve 36 is at least partially supported on the second step portion. The annular pressure sleeve 36 is provided to protrude laterally from the second step portion so as to form a sealing groove for the sealing ring 35 to be accommodated between it and the first annular step portion.

[0087] The first annular step portion is arranged circumferentially along the outer peripheral wall of the valve core 32 to support the sealing ring 35. The second step portion is integrally formed on the side of the first step portion away from the valve port b and passes through the end of the valve core 32 to support the annular pressure sleeve 36.

[0088] The sealing ring 35, when assembled on the first step, can effectively block the fluid passage between the valve port b and the medium inlet when the valve core 32 closes the valve port b, preventing the medium from leaking through the gap between the valve core 32 and the upper valve seat 12, thereby improving the sealing performance of the valve.

[0089] The annular pressure sleeve 36 is installed on the second step, with one part supported on the step and the other part protruding outward. It forms a stop and limit on the sealing ring 35 in the axial direction to prevent the sealing ring 35 from shifting or falling off during movement. At the same time, the outer peripheral wall of the annular pressure sleeve 36 is flush with the outer peripheral wall of the valve core 32, and can serve as part of the guide structure to assist the valve core 32 in moving smoothly within the guide hole 12a.

[0090] By setting a stepped structure on the valve core 32 and assembling it with the sealing ring 35 and the annular pressure sleeve 36, not only is a good dynamic sealing effect achieved, but the stability and guidance of the valve core 32 during movement are also enhanced, avoiding problems such as leakage and jamming caused by seal failure or poor guidance.

[0091] This utility model also proposes a refrigeration device, which can be an air conditioner or a refrigerator, etc. The refrigeration device includes a heat exchanger and an electric valve 100. The specific structure of the electric valve 100 is as described in the above embodiments. Since this refrigeration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0092] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An electric valve, characterized in that, include: The valve body has a valve cavity and a valve port communicating with the valve cavity; The rotor assembly includes a rotor rotatably mounted inside the valve chamber and a lead screw fixedly connected to the rotor; A nut assembly includes a nut and a valve core connected to one end of the nut. The other end of the nut is threaded into a lead screw. When the lead screw rotates, the nut can drive the valve core to move along its axial direction in a direction close to and away from the valve port, so as to have a lower limit position for closing the valve port and an upper limit position away from the valve port. The length of the internal thread of the nut is set to be greater than the length of the external thread of the lead screw. At both the upper limit position and the lower limit position, the external thread of the lead screw is fully engaged with the internal thread of the nut.

2. The electric valve as described in claim 1, characterized in that, The lead screw includes multiple rod segments, which include a first rod segment, a second rod segment, and a third rod segment arranged sequentially in the direction close to the valve port; The rotor assembly also includes: A fixed plate connects the rotor and the lead screw. The fixed plate has a connecting hole through which the first rod segment passes to connect with the fixed plate. A bearing assembly is fixedly connected to the valve body, and the bearing assembly is sleeved around the second rod segment; The third rod segment is threadedly engaged with the nut. The third rod segment includes a clearance section and a mating section arranged sequentially in the direction close to the valve port. The mating section is provided with the external thread.

3. The electric valve as described in claim 2, characterized in that, The length of the mating section is a, the length of the clearance section is b, and the length of the internal thread of the nut is c, where a+b>c>a.

4. The electric valve as described in claim 2, characterized in that, The lead screw also includes a plurality of stop protrusions protruding from the side wall of the lead screw, the plurality of stop protrusions including: A first limiting protrusion, disposed between the first rod segment and the second rod segment, is used to axially limit the movement of the fixing plate; and... The second limiting protrusion is provided between the second rod segment and the third rod segment, and is used to limit the bearing axially.

5. The electric valve as described in claim 2, characterized in that, The diameter of the first rod segment is D1, the diameter of the second rod segment is D2, and the diameter of the third rod segment is D3, where D1 < D2 < D3.

6. The electric valve as described in claim 2, characterized in that, The plurality of rod segments further includes a guide segment, which is located at the end of the third rod segment away from the second rod segment, and the diameter of the guide segment is set to be smaller than the diameter of the third rod segment.

7. The electric valve as described in claim 2, characterized in that, The first rod segment is welded to the fixed plate; and / or, The second rod segment is welded to the bearing assembly.

8. The electric valve as described in any one of claims 1 to 7, characterized in that, The valve body includes a lower valve seat, an upper valve seat, and a housing that together enclose the valve cavity. The lower valve seat has a first end and a second end that are arranged opposite to each other. The first end of the upper valve seat is provided with the lower valve seat, and the second end is provided with the housing. The valve port is provided on the lower valve seat, and the rotor assembly is disposed inside the housing. The upper valve seat is provided with guide holes extending through both ends thereto, and the valve core is movably disposed along the guide holes.

9. The electric valve as described in claim 8, characterized in that, The valve core has a recessed receiving groove at the end opposite to the valve port; The nut assembly also includes: A pressure plate is provided on the opening of the receiving groove. The pressure plate has a through hole communicating with the receiving groove. The nut passes through the through hole. A stop protrusion is provided on the outer side wall of the nut at one end inside the receiving groove. The stop protrusion is used to limit the axial movement of the nut; and... A spring is disposed within the receiving groove and located at the end of the nut near the valve port. The spring is used to provide a counterforce when the nut moves toward the valve port.

10. The electric valve as claimed in claim 8, characterized in that, The outer peripheral wall of the valve core is provided with a first annular step portion and a second step portion along its circumference. The second step portion is located on the side of the first annular step portion away from the valve port and is provided through the end of the valve core. The nut assembly further includes a sealing ring and an annular pressure sleeve. The sealing ring is supported on the first annular step portion, and the annular pressure sleeve is at least partially supported on the second step portion. The annular pressure sleeve is laterally protruding from the second step portion to form a sealing groove between itself and the first annular step portion for the sealing ring to be received.

11. A refrigeration device, characterized in that, Includes the electric valve as described in any one of claims 1 to 10.

12. The refrigeration equipment as described in claim 11, characterized in that, The refrigeration equipment includes an air conditioner.

Images