Electrically powered valve and refrigeration appliance

Abstract

The utility model discloses an electric valve and refrigeration equipment relates to refrigeration control technical field, wherein, electric valve includes lower valve seat, upper valve seat, rotor subassembly and valve core subassembly, and rotor subassembly includes screw rod, valve core subassembly includes valve core, nut, spring and spacing pressure cover, and the end of valve core towards valve port recessed has the accommodation groove, and the groove bottom of accommodation groove is equipped with the through -hole, and the nut is worn in the through -hole and is threadedly cooperated with screw rod, and the outside wall of one end in the accommodation groove of nut is provided with first limit convex part, and first limit convex part is used for the axial movement limit of nut, spring and spacing pressure cover are located in the accommodation groove, and spacing pressure cover is fixedly connected in valve core, and spring is located between spacing pressure cover and nut, and under the valve door closed state, spring is always in compression state, can provide pre -tightening force for valve core subassembly under different temperature change conditions, effectively avoid the sealing failure problem caused by thermal expansion or cold shrink, thereby improve the overall sealing reliability of valve.

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 existing technologies, when an electric valve is in the closed state and exposed to high temperatures, its valve port, typically made of plastic material, may expand upon heating, pushing the valve core assembly upwards. This causes a tiny gap to form between the originally closed valve ports, affecting sealing performance. When the ambient temperature returns to normal, the valve port material contracts, but due to the clearance between the threads of the lead screw and nut, the valve core assembly cannot automatically return to its initial closed position, resulting in poor valve sealing or even leakage. Utility Model Content

[0003] The main purpose of this utility model is to propose an electric valve and refrigeration equipment, which aims to solve the problem that the valve core assembly of existing electric valves is prone to poor sealing or even leakage.

[0004] To achieve the above objectives, the electric valve proposed in this utility model includes:

[0005] The lower valve seat and the upper valve seat together form a valve cavity, and the lower valve seat is also provided with a valve port that communicates with the valve cavity;

[0006] Rotor assembly, including a rotatably mounted lead screw;

[0007] Valve core assembly, including:

[0008] The valve core is movably disposed in the direction of approaching and away from the valve port, and the end of the valve core facing the valve port is recessed with a receiving groove, and the bottom of the receiving groove is provided with a through hole;

[0009] A nut, threaded through the through hole and connected to the lead screw, allows the nut to move axially towards and away from the valve port as the lead screw rotates. A first limiting protrusion protrudes from the outer wall of the nut at one end within the receiving groove, the first limiting protrusion limiting the axial movement of the nut; and...

[0010] A spring and a limiting sleeve are provided in the receiving groove. The limiting sleeve is fixedly connected to the valve core. The spring is provided between the limiting sleeve and the nut to provide a reverse force when the nut moves toward the valve port.

[0011] In one embodiment, the nut has a recessed positioning groove at one end near the valve port, and the end of the spring is positioned within the positioning groove; and / or,

[0012] The limiting sleeve has a limiting groove recessed at one end facing the spring, and the spring is installed in the limiting groove.

[0013] In one embodiment, the limiting groove includes a first groove segment and a second groove segment arranged sequentially from the inside to the outside, wherein the second groove segment is arranged outwardly in a direction away from the first groove segment to make way when the nut moves toward the valve port.

[0014] In one embodiment, the receiving groove includes a third groove segment and a fourth groove segment arranged sequentially from the inside to the outside, the third groove segment being recessed relative to the fourth groove segment to form a first annular stepped surface facing the valve port between the third groove segment and the fourth groove segment;

[0015] The limiting sleeve is supported on the first annular step surface.

[0016] In one embodiment, the upper valve seat has a guide groove recessed at one end facing the valve port, and the valve core is movably mounted in the guide groove to have a lower limit position for closing the valve port and an upper limit position away from the valve port.

[0017] The bottom of the guide groove is provided with a mounting hole extending axially along the upper valve seat, and the nut passes through the mounting hole to engage with the lead screw thread.

[0018] In one embodiment, the inner wall of the mounting hole is provided with an anti-rotation part, and the outer wall of the nut is provided with a mating part that engages with the anti-rotation part to restrict the circumferential rotation of the nut.

[0019] In one embodiment, the valve core extends at least partially out of the guide groove, and the outer side wall of the valve core is also provided with a second limiting protrusion. The second limiting protrusion is used to cooperate with the lower end face of the upper valve seat to stop the valve core when it moves away from the valve port, so as to limit the valve core to the upper limit position.

[0020] In one embodiment, at the upper limit position, a cavity is defined between the valve core and the inner wall of the guide groove;

[0021] The electric valve also includes a housing, which is mounted on the side of the upper valve seat opposite to the lower valve seat, so as to form a mounting cavity for mounting the rotor assembly.

[0022] The upper valve seat is provided with a first communication channel connecting the mounting cavity and the cavity;

[0023] The valve core assembly is provided with a second communication channel connecting the cavity and the valve cavity.

[0024] In one embodiment, the limiting sleeve is recessed at one end facing the spring, and at least one first connecting hole is provided at the bottom of the limiting groove;

[0025] A first communicating groove is defined between the outer wall of the nut and the hole wall of the valve core, and the first communicating groove connects the cavity and the limiting groove.

[0026] The second connecting channel includes the first connecting hole, the limiting groove, and the first connecting slot.

[0027] In one embodiment, the first limiting protrusion is arranged in a ring shape, and at least one vent groove is provided on the first limiting protrusion, the vent groove connecting the through hole and the limiting groove.

[0028] In one embodiment, the valve core assembly further includes a filter screen disposed corresponding to the first connecting hole.

[0029] In one embodiment, the filter screen is disposed at the bottom of the limiting groove, and the filter screen is disposed at the end of the spring away from the nut.

[0030] In one embodiment, the valve core assembly further includes a sealing ring;

[0031] The outer wall of the valve core is recessed with a sealing groove along its circumference, and the sealing ring is installed in the sealing groove.

[0032] This utility model also provides a refrigeration device, the refrigeration device including an electric valve, the electric valve comprising:

[0033] The lower valve seat and the upper valve seat together form a valve cavity, and the lower valve seat is also provided with a valve port that communicates with the valve cavity;

[0034] Rotor assembly, including a rotatably mounted lead screw;

[0035] Valve core assembly, including:

[0036] The valve core is movably disposed in the direction of approaching and away from the valve port, and the end of the valve core facing the valve port is recessed with a receiving groove, and the bottom of the receiving groove is provided with a through hole;

[0037] A nut, threaded through the through hole and connected to the lead screw, allows the nut to move axially towards and away from the valve port as the lead screw rotates. A first limiting protrusion protrudes from the outer wall of the nut at one end within the receiving groove, the first limiting protrusion limiting the axial movement of the nut; and...

[0038] A spring and a limiting sleeve are provided in the receiving groove. The limiting sleeve is fixedly connected to the valve core. The spring is provided between the limiting sleeve and the nut to provide a reverse force when the nut moves toward the valve port.

[0039] In one embodiment, the refrigeration equipment includes an air conditioner.

[0040] The technical solution of this utility model uses a spring and a limiting sleeve jointly set inside the receiving groove. The limiting sleeve is fixedly connected to the valve core, and the spring is arranged between the limiting sleeve and the nut. As the nut moves towards the valve port, the spring is compressed and provides a reverse force to assist the valve core in returning to its original position and enhance the sealing performance. When assembling the valve core assembly, simply flip the valve core so that the opening of the receiving groove faces upward, and then pass the nut through the through hole from the receiving groove. At this time, the first limiting protrusion on the nut will naturally cooperate with the valve core stop to achieve initial positioning. Then, place the spring into the receiving groove and support one end of it on the end of the nut. Finally, press the limiting sleeve into the receiving groove and fix it to the valve core to complete the assembly. The entire assembly process has good guidance and limiting properties, simplifies the operation steps, improves assembly efficiency, and reduces production costs. Attached Figure Description

[0041] 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.

[0042] Figure 1 A schematic diagram of an embodiment of the electric valve provided by this utility model;

[0043] Figure 2 for Figure 1 A schematic diagram of the assembly of the upper valve seat and the lead screw;

[0044] Figure 3 for Figure 1 A cross-sectional schematic diagram of the first embodiment of the valve core assembly;

[0045] Figure 4 for Figure 3 A cross-sectional schematic diagram of the middle limiting pressure sleeve;

[0046] Figure 5 for Figure 1 A cross-sectional schematic diagram of the second embodiment of the valve core assembly;

[0047] Figure 6 for Figure 5A cross-sectional schematic diagram of the middle limiting pressure sleeve;

[0048] Figure 7 for Figure 1 A cross-sectional schematic diagram of the valve core;

[0049] Figure 8 and Figure 9 for Figure 1 A schematic diagram of the structure of the nut.

[0050] Explanation of icon numbers:

[0051] 100. Electric valve; 1. Lower valve seat; 2. Upper valve seat; 2a. Guide groove; 2b. Mounting hole; 2c. First connecting channel; 21. Anti-rotation part; a. Valve cavity; b. Valve port; c. Cavity; d. Mounting cavity; 30. Rotor assembly; 31. Lead screw; 40. Valve core assembly; 40a. Second connecting channel; 41. Valve core; 41a. Receiving groove; 41a1. Third groove segment; 41a2. Fourth groove segment; 41b. Through hole; 411 412. First annular stepped surface; 413. Second limiting protrusion; 414. Sealing groove; 42. Nut; 425. First limiting protrusion; 426. Vent groove; 427. Positioning groove; 428. Mating part; 419. First connecting groove; 420. Spring; 421. Limiting sleeve; 421. Limiting groove; 421. First groove segment; 421. Second groove segment; 422. First connecting hole; 43. Filter screen; 444. Sealing ring; 5. Housing.

[0052] 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

[0053] 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.

[0054] 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.

[0055] 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. 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.

[0056] In existing technologies, when an electric valve is in the closed state and exposed to high temperatures, its valve port, typically made of plastic material, may expand upon heating, pushing the valve core assembly upwards. This causes a tiny gap to form between the originally closed valve ports, affecting sealing performance. When the ambient temperature returns to normal, the valve port material contracts, but due to the clearance between the threads of the lead screw and nut, the valve core assembly cannot automatically return to its initial closed position, resulting in poor valve sealing or even leakage.

[0057] This utility model proposes an electric valve 100, which aims to solve the problem that the valve core assembly of existing electric valves is prone to poor sealing or even leakage.

[0058] Please see Figures 1 to 3In one embodiment of this utility model, the electric valve 100 includes a lower valve seat 1, an upper valve seat 2, a rotor assembly 30, and a valve core assembly 40. The lower valve seat 1 and the upper valve seat 2 enclose a valve cavity a, and the lower valve seat 1 is also provided with a valve port b communicating with the valve cavity a. The rotor assembly 30 includes a rotatably disposed lead screw 31. The valve core assembly 40 includes a valve core 41, a nut 42, a spring 43, and a limiting sleeve 44. The valve core 41 is movably disposed in the direction approaching and away from the valve port b. The end of the valve core 41 facing the valve port b is recessed with a receiving groove 41a, and the bottom of the receiving groove 41a is provided with a through hole 41b. The nut 42 passes through the through hole. 41b is threaded into the lead screw 31 so that when the lead screw 31 rotates, the nut 42 can move along its axial direction in the direction approaching and away from the valve port b. The outer wall of the nut 42 located at one end inside the receiving groove 41a is provided with a first limiting protrusion 421, which is used to limit the axial movement of the nut 42. A spring 43 and a limiting sleeve 44 are provided in the receiving groove 41a. The limiting sleeve 44 is fixedly connected to the valve core 41. The spring 43 is provided between the limiting sleeve 44 and the nut 42 to provide a reverse force when the nut 42 moves towards the valve port b.

[0059] It is understood that the electric valve 100 includes a lower valve seat 1 and an upper valve seat 2, which are connected to each other and enclose to form a valve cavity a. The lower valve seat 1 is provided with a valve port b that communicates with the valve cavity a, so as to realize the opening and closing control of the fluid channel.

[0060] The rotor assembly 30 includes a rotatably mounted lead screw 31, which is linked to a drive device (such as a motor) to convert rotational motion into linear motion.

[0061] The valve core assembly 40 mainly includes structural components such as valve core 41, nut 42, spring 43, and limiting sleeve 44. The valve core 41 can reciprocate in the direction of approaching or away from the valve port b, and completes the action by cooperating with the internal components through the receiving groove 41a provided at the end facing the valve port b.

[0062] The bottom of the receiving groove 41a has a through hole 41b for the nut 42 to pass through and form a threaded engagement with the lead screw 31, so that when the lead screw 31 rotates, the nut 42 can move axially relative to the valve core 41. A first limiting protrusion 421 is provided on the outer wall of one end of the nut 42 located within the receiving groove 41a. This limiting protrusion engages with a corresponding structural stop on the valve core 41, thereby limiting the axial movement range of the nut 42.

[0063] Spring 43 and limiting sleeve 44 are both disposed inside receiving groove 41a. Limiting sleeve 44 is fixedly connected to valve core 41, and spring 43 is arranged between limiting sleeve 44 and nut 42. During the process of nut 42 moving towards valve port b, spring 43 is compressed and provides a reverse force to assist valve core 41 to return to its original position and enhance sealing performance.

[0064] Specifically, when the valve is closed, the spring 43 is always in a compressed state, which can continuously provide preload to the valve core assembly 40 under different temperature changes, effectively avoiding sealing failure caused by thermal expansion or contraction, thereby improving the overall sealing reliability of the valve.

[0065] In terms of assembly, the electric valve 100 provided in this application has a more reasonable structural design and is easier to operate. Specifically, when assembling the valve core assembly 40, simply flip the valve core 41 so that the opening of the receiving groove 41a faces upward, and then pass the nut 42 through the receiving groove 41a through the through hole 41b. At this time, the first limiting protrusion 421 on the nut 42 will naturally cooperate with the stop of the valve core 41 to achieve initial positioning. Then, place the spring 43 into the receiving groove 41a and support one end of it on the end of the nut 42. Finally, press the limiting sleeve 44 into the receiving groove 41a and fix it to the valve core 41 to complete the assembly.

[0066] Compared to the existing technology, which requires sequentially inserting the spring 43, nut 42, and pressure sleeve into the closed cavity inside the valve core 41, the spring 43 is usually in an extended state before the pressure sleeve is pressed in. Therefore, the top of the nut 42 may protrude from the surface of the valve core 41. In this case, the installation of the pressure sleeve not only needs to overcome the reverse elastic force of the spring 43, but also needs to accurately align the position of the pressure sleeve with the opening of the valve core 41. The process is cumbersome and can easily cause misalignment or even damage to parts.

[0067] This application, by setting an open receiving slot 41a structure, allows each component to be loaded sequentially from the slot opening direction. The entire assembly process has good guidance and positioning, simplifies operation steps, improves assembly efficiency, and reduces production costs.

[0068] Furthermore, to enhance the assembly stability of the spring 43 within the valve core assembly 40 and ensure that it accurately transmits the elastic force to the nut 42 during compression and rebound, please refer to... Figure 3 and Figure 9 In this embodiment, the end of the nut 42 facing the spring 43 is recessed with a positioning groove 42a, and one end of the spring 43 is positioned in the positioning groove 42a.

[0069] Understandably, the shape of the positioning groove 42a is adapted to the end of the spring 43, allowing one end of the spring 43 to be embedded and positioned within the groove. This structural design not only helps improve the installation accuracy of the spring 43 within the receiving groove 41a, preventing the spring 43 from shifting or tilting during force application, thus affecting its elastic performance, but also effectively prevents the spring 43 from dislodging due to vibration or impact during long-term use, thereby improving the overall reliability and service life of the structure.

[0070] During actual assembly, when the spring 43 is pressed into the receiving groove 41a and engages with the limiting sleeve 44, its end near the nut 42 naturally embeds into the positioning groove 42a on the nut 42, forming a stable connection. This allows the spring 43 to act more evenly on the nut 42 when compressed, thereby causing the valve core 41 to tightly fit against the periphery of the valve port b. Furthermore, the positioning groove 42a simplifies the assembly process, allowing operators to install the spring 43 without the need for additional fixtures or auxiliary positioning structures, thus improving production efficiency and assembly consistency.

[0071] Furthermore, in order to improve the assembly accuracy and stress stability of the spring 43 within the receiving groove 41a, and to prevent it from shifting, tilting, or even dislodging during compression or rebound, thereby affecting the sealing performance and action response of the valve core assembly 40, in this embodiment, please refer to... Figures 3 to 6 The limiting sleeve 44 has a limiting groove 44a recessed at one end facing the spring 43, and the spring 43 is installed in the limiting groove 44a.

[0072] It should be noted that the shape and size of the limiting groove 44a are adapted to most of the structure along the length of the spring 43, allowing one end of the spring 43 to be embedded and stably installed within the limiting groove 44a. The limiting groove 44a not only serves to axially position the spring 43, preventing unnecessary displacement during assembly or operation, but also provides a certain guiding function when the spring 43 undergoes compression deformation, ensuring it is evenly stressed along a predetermined direction, thereby improving the stability and consistency of elastic force transmission.

[0073] The design of the limiting groove 44a simplifies the assembly process of the spring 43, allowing operators to quickly position and install the spring 43 without the need for additional tools, thus improving overall assembly efficiency and product consistency. Compared to existing technologies where the spring 43 may be freely placed or rely on external structural constraints, this invention directly positions and guides the spring 43 through the limiting groove 44a on the limiting sleeve 44. This results in a compact structure with a clear function, significantly improving the sealing stability and responsiveness of the electric valve 100 during long-term operation.

[0074] Further, please refer to Figures 3 to 6In this embodiment, the limiting groove 44a includes a first groove segment 44a1 and a second groove segment 44a2 arranged sequentially from the inside to the outside. The second groove segment 44a2 is arranged to expand outward in a direction away from the first groove segment 44a1, so as to make way when the nut 42 moves toward the groove opening of the limiting groove 44a.

[0075] The limiting groove 44a includes a first groove segment 44a1 and a second groove segment 44a2 arranged sequentially from the inside to the outside. The first groove segment 44a1 is located close to the spring 43 to achieve stable installation of the end of the spring 43. The second groove segment 44a2 has an outward expansion structure in the direction away from the first groove segment 44a1, that is, its cross-sectional area gradually increases along the groove depth direction. Please refer to [link / reference]. Figures 3 to 5 The first limiting protrusion 421 of the nut 42 has a maximum radial dimension of L, and the second groove segment 44a2 of the limiting groove 44a has a maximum radial dimension of D. D is set to be greater than L. In this way, when the nut 42 moves toward the groove opening of the limiting groove 44a, it provides sufficient room for movement and avoids affecting the smooth movement of the valve core assembly 40 due to structural interference.

[0076] Specifically, when the nut 42 moves upward driven by the lead screw 31, the part of it that enters the limiting groove 44a will gradually approach the groove opening as it moves. At this time, the second groove section 44a2 in the form of outward expansion can effectively provide clearance space to prevent jamming or increased resistance caused by insufficient fitting clearance, thereby ensuring the smooth operation and consistent response of the valve core assembly 40 throughout the entire stroke range.

[0077] Specifically, please refer to Figure 3 and Figure 7 In this embodiment, the receiving groove 41a includes a third groove segment 41a1 and a fourth groove segment 41a2 arranged sequentially from the inside to the outside. The third groove segment 41a1 is recessed relative to the fourth groove segment 41a2 to form a first annular stepped surface 411 facing the valve port b between the third groove segment 41a1 and the fourth groove segment 41a2. The limiting sleeve 44 is supported on the first annular stepped surface 411.

[0078] The receiving groove 41a of the valve core 41 adopts a segmented structure design, including a third groove segment 41a1 and a fourth groove segment 41a2 arranged sequentially from the inside to the outside. The inner diameter of the third groove segment 41a1 is relatively small and it tapers inward, forming a first annular stepped surface 411 facing the valve port b between it and the fourth groove segment 41a2, which has a larger outer diameter. This first annular stepped surface 411 not only provides a stable support base for the limiting sleeve 44, but also effectively limits its axial position.

[0079] Specifically, the third groove 41a1 is mainly used to accommodate the first limiting protrusion 421 on the nut 42, ensuring that it has a clear stopping boundary during movement; while the fourth groove 41a2 is used to accommodate the limiting sleeve 44, allowing it to be stably embedded and fixed inside the valve core 41. Since the size of the fourth groove 41a2 is adapted to the shape of the limiting sleeve 44, and the first annular stepped surface 411 is located between the two, the limiting sleeve 44 is confined within this area after assembly, preventing axial displacement, thereby ensuring the stability and reliability of the overall structure.

[0080] This structural design offers advantages in assembly and subsequent processing, particularly in the connection between the limiting sleeve 44 and the valve core 41. The presence of the first annular stepped surface 411 allows the limiting sleeve 44 to naturally conform to this surface during installation, facilitating axial positioning and providing a good contact surface for subsequent welding operations. Compared to traditional structures that require complex alignment and clamping methods for fixation, this application effectively improves welding accuracy and efficiency while enhancing connection strength through the guiding effect of the stepped surface.

[0081] Further, please refer to Figure 1 and Figure 2 In this embodiment, the upper valve seat 2 is recessed with a guide groove 2a at one end facing the valve port b. The valve core 41 is movably installed in the guide groove 2a to have a lower limit position for closing the valve port b and an upper limit position away from the valve port b. The bottom of the guide groove 2a is provided with a mounting hole 2b extending axially along the upper valve seat 2. The nut 42 passes through the mounting hole 2b to be threadedly engaged with the lead screw 31.

[0082] The upper valve seat 2 has a recessed guide groove 2a at one end facing the valve port b. This guide groove 2a is used to slidably mount the valve core 41 and limits its reciprocating motion between the lower limit position of closing the valve port b and the upper limit position away from the valve port b. The bottom of the guide groove 2a has a mounting hole 2b extending axially along the upper valve seat 2. The nut 42 passes through the mounting hole 2b and forms a threaded engagement with the lead screw 31, thereby converting the rotational motion of the lead screw 31 into the linear displacement of the nut 42 and the valve core assembly 40, realizing the opening and closing action of the valve.

[0083] By directly machining the guide groove 2a on the upper valve seat 2 to guide the valve core 41, the structure is not only compact, but also eliminates the need for the guide bushing and related fixing parts that are required in the traditional structure to achieve the guiding function. This effectively simplifies the overall structural design, reduces the number of parts and assembly processes, and improves manufacturing efficiency and assembly accuracy.

[0084] Compared to the existing technology, which usually requires a guide bushing to be installed separately inside the valve seat and fixed by a clamping cap or other positioning structure, this application realizes the guiding function of the valve core 41 by integrally forming a guide groove 2a on the upper valve seat 2, thus avoiding the problem of unstable operation of the valve core 41 due to improper assembly or loosening of the guide component.

[0085] Furthermore, to ensure that when the lead screw 31 rotates relative to the nut 42, the nut 42 only produces linear motion along its axial direction to drive the valve core 41 to open or close the valve port b, and to avoid transmission failure or control instability caused by the nut 42's own circumferential rotation, in this embodiment, please refer to... Figure 2 and Figure 8 The inner wall of the mounting hole 2b is provided with an anti-rotation part 21, and the outer wall of the nut 42 is provided with a mating part 422 that engages with the anti-rotation part 21 to restrict the circumferential rotation of the nut 42.

[0086] An anti-rotation part 21 is provided on the inner wall of the mounting hole 2b, and correspondingly, a mating part 422 that mates with the anti-rotation part 21 is provided on the outer wall of the nut 42. This anti-rotation mating structure can effectively restrict the circumferential degree of freedom of the nut 42 after assembly, so that it can only move axially under the guidance of the guide groove 2a.

[0087] Specifically, the anti-rotation part 21 can be one or more limiting protrusions protruding from a local area of ​​the inner wall of the mounting hole 2b, while the mating part 422 is a groove or planar structure correspondingly provided on the outer wall of the nut 42. The two are adapted to each other to form an anti-rotation mating relationship.

[0088] As another implementation, the cross-sectional shape of at least one segment of the mounting hole 2b can be designed to be non-circular, such as an elongated hole or other irregularly shaped hole with a limiting function. Correspondingly, the outer peripheral part of the nut 42 that mates with the segment of the hole is also machined to match the cross-sectional shape, so that the nut 42 cannot rotate around its own axis after being inserted into the mounting hole 2b, but can still slide freely along the axial direction of the hole.

[0089] Through the design of the anti-rotation structure, during the operation of the electric valve 100, when the lead screw 31 rotates under the drive of the motor, the nut 42 cannot rotate synchronously due to the restriction of the anti-rotation structure. Therefore, it can only move along the axial direction under the drive of the lead screw 31, thereby pushing or pulling the valve core 41 to make linear reciprocating motion in the guide groove 2a, so as to achieve precise control of the opening degree of the valve port b.

[0090] In this embodiment, please refer to Figure 3The valve core 41 extends at least partially out of the guide groove 2a; the limiting structure includes a second limiting protrusion 412 disposed on the outer side wall of the valve core 41. The second limiting protrusion 412 is located outside the guide groove 2a and is used to cooperate with the lower end face of the upper valve seat 2 to stop the valve core 41 when it moves away from the valve port b, so as to limit the valve core 41 to the upper limit position.

[0091] The valve core 41 extends at least partially out of the guide groove 2a to achieve a limiting engagement with the upper valve seat 2 when it is in the upper limit position. The limiting structure includes a second limiting protrusion 412 disposed on the outer side wall of the valve core 41. The second limiting protrusion 412 is located outside the guide groove 2a. During the movement of the valve core 41 toward the upper limit position, when the valve core 41 reaches the predetermined position, the second limiting protrusion 412 can make a stop contact with the lower end face of the upper valve seat 2, thereby limiting the valve core 41 from moving further upward and keeping it stably in the upper limit position.

[0092] Specifically, when the valve core 41 is in the upper limit position, a mechanical limiting structure is formed between the second limiting protrusion 412 and the lower end face of the upper valve seat 2. This limiting cooperation prevents the valve core 41 from deviating from the set position due to external vibration or fluid impact, while ensuring that the valve core 41 maintains a stable high position without being driven by force, providing an accurate starting position basis for subsequent valve opening or closing actions.

[0093] The design of the above-mentioned limiting structure is not only simple and easy to manufacture, but also exhibits good limiting reliability and action consistency in actual operation, making it particularly suitable for the use of electric valve 100 under frequent opening and closing conditions.

[0094] By providing the second limiting protrusion 412 on the outer wall of the valve core 41 and arranging it outside the guide groove 2a, the limiting effect occurs outside the guide groove 2a, avoiding interference with the sliding process of the valve core 41 within the guide groove 2a, thereby ensuring the smoothness of the valve core 41's movement and the guiding accuracy. Furthermore, this limiting method achieves reliable limiting functionality without additional power components, helping to simplify the overall structure and reduce manufacturing costs.

[0095] Further, please refer to Figure 1 and Figure 3In this embodiment, at the upper limit position, a cavity c is defined between the valve core 41 and the inner wall of the guide groove 2a; the electric valve 100 also includes a housing 5, which is installed on the side of the upper valve seat 2 away from the lower valve seat 1, so as to form an installation cavity d for mounting the rotor assembly 30 by surrounding the upper valve seat 2; the upper valve seat 2 is provided with a first communication channel 2c connecting the installation cavity d and the cavity c; the valve core assembly 40 is provided with a second communication channel 40a connecting the cavity c and the valve cavity a.

[0096] When the valve core 41 is at its upper limit position away from the valve port b, its end face is spaced apart from the bottom of the guide groove 2a, forming a relatively closed cavity c. This cavity c, as a key part of the gas flow path, is connected to the mounting cavity d located above it via a first connecting channel 2c provided on the upper valve seat 2. The mounting cavity d is formed by the housing 5 and the upper valve seat 2 and is used to accommodate the rotor assembly 30 (such as the lead screw 31, motor, and other drive components). At the same time, a second connecting channel 40a is also provided on the valve core assembly 40 to connect the cavity c and the valve cavity a, thereby forming a continuous gas flow path between the mounting cavity d, the cavity c, and the valve cavity a.

[0097] This structural design not only achieves air pressure balance among multiple chambers inside the electric valve 100, but also helps reduce the instability of the valve core 41 movement caused by air pressure difference, thereby improving the smoothness and response accuracy of the valve action.

[0098] Furthermore, the first connecting channel 2c is directly set in the upper valve seat 2 body, without the need for additional connecting pipes or sealing structures, simplifying the overall structure and improving assembly efficiency; while the second connecting channel 40a is integrated on the valve core assembly 40, for example by opening a flow channel inside the valve core 41 or reserving a gap between the mating parts 422, which facilitates processing and maintenance.

[0099] Through the synergistic effect of the two connecting channels, abnormal stress caused by air pressure changes during high-temperature or rapid opening and closing can be effectively avoided, thereby preventing valve core 41 from jamming, shifting, or failing to seal. This ensures that the electric valve 100 maintains good operating performance and sealing reliability even under complex operating conditions. In addition, this air pressure balancing structure can reduce the additional resistance that the drive components need to overcome, extending the service life of the electric valve 100.

[0100] Further, please refer to Figure 3In this embodiment, the limiting sleeve 44 is recessed at one end facing the spring 43 with a limiting groove 44a, and at least one first connecting hole 44b is provided through the bottom of the limiting groove 44a; a first connecting groove e is defined between the outer wall of the nut 42 and the hole wall of the valve core 41, and the first connecting groove e connects the cavity c and the limiting groove 44a; the second connecting channel 40a includes the first connecting hole 44b, the limiting groove 44a and the first connecting groove e.

[0101] It should be noted that the first connecting groove e connects the cavity c to the limiting groove 44a, so that the gas can sequentially pass through the cavity c, the first connecting groove e, and the first connecting hole 44b into the limiting groove 44a, and finally connect with the valve cavity a, thereby achieving pressure balance between the mounting cavity d, the cavity c, and the valve cavity a.

[0102] The first connecting hole 44b, the limiting groove 44a and the first connecting groove e together constitute the specific structural form of the second connecting channel 40a. Its design is not only compact and easy to process, but also can keep the gas flow path unobstructed during the movement of the valve core 41, effectively avoiding pressure imbalance caused by local blockage or structural interference.

[0103] By specifically constructing the second connecting channel 40a into a composite air circuit structure consisting of the first connecting hole 44b, the limiting groove 44a, and the first connecting groove e, a reliable air pressure balance function can be achieved by making full use of the existing fitting clearance and structural features inside the valve core assembly 40 without adding additional complex processing technology.

[0104] Specifically, please refer to Figure 8 and Figure 9 In this embodiment, the outer wall of the nut 42 located at one end of the receiving groove 41a is provided with an annular limiting protrusion, which is used to limit the axial movement of the nut 42; the first limiting protrusion 421 is arranged in annular shape, and at least one vent groove 421a is provided on the first limiting protrusion 421, which connects the through hole 41b and the limiting groove 44a.

[0105] The second limiting protrusion 412 is configured as an annular structure surrounding the outer wall of the nut 42. This structure can provide a stable and uniform stop and limit effect on the upward movement of the nut 42 in its axial direction, avoiding the phenomenon of deflection or jamming caused by uneven local force, thereby improving the reliability and repeatability of the limiting action.

[0106] Furthermore, at least one vent groove 421a is provided through the annular structure. This vent groove 421a is used to realize the gas flow function between the through hole 41b and the limiting groove 44a, thereby providing a smooth air path for the entire air pressure balance system. The vent groove 421a can take various forms, such as a through hole structure that directly penetrates the thickness direction of the second limiting protrusion 412, or a groove-shaped structure that extends circumferentially and passes through both ends while also laterally penetrating its outer wall. The specific form can be selected according to the processing technology and spatial layout requirements.

[0107] By providing a vent groove 421a on the second limiting protrusion 412, not only is the limiting function achieved, but the need for air passage connectivity is also effectively taken into account, allowing gas to flow smoothly between the various chambers inside the valve core assembly 40, thereby maintaining the pressure balance between the mounting chamber d, the cavity c, and the valve chamber a. Especially when the valve core 41 is in the upper limit position, even if a closed chamber is formed between the valve core 41 and the upper valve seat 2, the air pressure can still be maintained through the air passage formed by the vent groove 421a, preventing vibration that occurs when the valve core 41 detaches from the upper valve seat 2 due to pressure difference release.

[0108] Furthermore, during the operation of the electric valve 100, especially when the valve is open, the cold medium in valve cavity a may enter cavity c through the second connecting channel 40a and further flow to mounting cavity d. It may also enter the threaded mating area between the lead screw 31 and nut 42. If the medium contains particulate impurities, these impurities may be carried by the airflow into the aforementioned precision moving mating part 422, causing wear, jamming, or even transmission failure. To avoid such problems, please refer to [link to relevant documentation]. Figure 5 and Figure 6 In this embodiment, the valve core assembly 40 further includes a filter screen 45 disposed corresponding to the first connecting hole 44b.

[0109] By setting a filter screen 45, and positioning the filter screen 45 corresponding to the first connecting hole 44b, impurities can be effectively intercepted without affecting the gas flow capacity, ensuring the long-term stable operation of the transmission components. This improves the adaptability and reliability of the electric valve 100 under complex operating conditions, while also extending the service life of the internal transmission mechanism and reducing the failure rate caused by impurities entering.

[0110] Specifically, in this embodiment, please refer to Figure 5 The filter screen 45 is located at the bottom of the limiting groove 44a, and the filter screen 45 is located at the end of the spring 43 away from the nut 42.

[0111] The filter screen 45 is positioned at the bottom of the limiting groove 44a and at the end of the spring 43 away from the nut 42. This allows the filter screen 45 to be directly pressed and fixed in the corresponding position of the limiting groove 44a by the elastic force of the spring 43. This structure eliminates the need for additional components for installation or fixation; the stable positioning and sealing support of the filter screen 45 are achieved solely through the cooperation between the spring 43 and the limiting groove 44a. This simplifies the overall structural design and improves assembly efficiency. Since the spring 43 is always under compression, it provides preload while ensuring that the filter screen 45 will not loosen or shift during long-term operation, thus effectively maintaining its filtration function.

[0112] This arrangement further optimizes the utilization of the internal space of the valve core assembly 40, combines the mechanical limiting function of the spring 43 with the installation requirements of the filter screen 45, and improves the structural integration.

[0113] This application uses a spring 43 to directly fix the filter screen 45, which not only reduces the number of parts and assembly steps, but also reduces the processing cost and maintenance difficulty caused by the complex structure.

[0114] Specifically, in this embodiment, please refer to Figure 3 and Figure 7 The valve core assembly 40 also includes a sealing ring 46, which is sleeved around the valve core 41.

[0115] It should be noted that the sealing ring 46 is usually made of a material with certain elasticity and temperature resistance, such as rubber or fluororubber, and is used to achieve a sealing fit between the valve core 41 and the upper valve seat 2 when the valve core 41 closes the valve port b.

[0116] When the valve core 41 moves towards the valve port b under the drive of the lead screw 31 and nut 42 and reaches the closed position, the sealing ring 46 is compressed and tightly fitted between the valve core 41 and the upper valve seat 2, effectively blocking the possibility of refrigerant leakage from the gap between them. Especially under high temperature or high pressure conditions, if this sealing structure is not provided, the refrigerant may flow along the gap between the outer wall of the valve core 41 and the guide groove 2a to the cavity c communicating with the refrigerant inlet and the mounting cavity d, thereby affecting the sealing performance of the electric valve 100, and even leading to external leakage or a decrease in system efficiency.

[0117] Furthermore, in order to ensure the sealing performance between the valve core 41 and the upper valve seat 2, and to prevent the sealing ring 46 from shifting or affecting the smoothness of movement during the sliding of the valve core 41, in this embodiment, the outer side wall of the valve core 41 is recessed with a sealing groove 41c along its circumference, and the sealing ring 46 is installed in the sealing groove 41c.

[0118] A sealing groove 41c is recessed along the circumference of the outer wall of the valve core 41, and a sealing ring 46 is embedded in the sealing groove 41c. This structural design not only provides stable axial positioning for the sealing ring 46, preventing it from moving up and down or falling off during the reciprocating motion of the valve core 41, but also allows the sealing ring 46 to maintain reasonable compression deformation in its groove, thereby achieving a good sealing effect.

[0119] In addition, the groove depth of the sealing groove 41c is reasonably designed according to the cross-sectional diameter of the selected sealing ring 46, so that the sealing ring 46 only partially protrudes outside the groove opening of the sealing groove 41c after installation. This ensures effective contact pressure between the sealing ring 46 and the inner wall of the guide groove 2a, and avoids the problem of excessive sliding resistance or even jamming between the valve core 41 and the upper valve seat 2 due to excessive protrusion of the sealing ring 46.

[0120] 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.

[0121] 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 lower valve seat and the upper valve seat together form a valve cavity, and the lower valve seat is also provided with a valve port that communicates with the valve cavity; Rotor assembly, including a rotatably mounted lead screw; Valve core assembly, including: The valve core is movably disposed in the direction of approaching and away from the valve port, and the end of the valve core facing the valve port is recessed with a receiving groove, and the bottom of the receiving groove is provided with a through hole; A nut, threaded through the through hole and connected to the lead screw, allows the nut to move axially towards and away from the valve port as the lead screw rotates. A first limiting protrusion protrudes from the outer wall of the nut at one end within the receiving groove, the first limiting protrusion limiting the axial movement of the nut; and... A spring and a limiting sleeve are provided in the receiving groove. The limiting sleeve is fixedly connected to the valve core. The spring is provided between the limiting sleeve and the nut to provide a reverse force when the nut moves toward the valve port.

2. The electric valve as described in claim 1, characterized in that, The nut has a recessed positioning groove at one end near the valve port, and the end of the spring is positioned within the positioning groove; and / or, The limiting sleeve has a limiting groove recessed at one end facing the spring, and the spring is installed in the limiting groove.

3. The electric valve as described in claim 2, characterized in that, The limiting groove includes a first groove segment and a second groove segment arranged sequentially from the inside to the outside. The second groove segment is arranged to expand outward in the direction away from the first groove segment so as to make way when the nut moves toward the valve port.

4. The electric valve as described in claim 1, characterized in that, The receiving groove includes a third groove segment and a fourth groove segment arranged sequentially from the inside to the outside. The third groove segment is recessed relative to the fourth groove segment to form a first annular stepped surface facing the valve port between the third groove segment and the fourth groove segment. The limiting sleeve is supported on the first annular step surface.

5. The electric valve as described in claim 1, characterized in that, The upper valve seat has a guide groove recessed at one end facing the valve port, and the valve core is movably mounted in the guide groove so as to have a lower limit position for closing the valve port and an upper limit position away from the valve port. The bottom of the guide groove is provided with a mounting hole extending axially along the upper valve seat, and the nut passes through the mounting hole to engage with the lead screw thread.

6. The electric valve as described in claim 5, characterized in that, The inner wall of the mounting hole is provided with an anti-rotation part, and the outer wall of the nut is provided with a mating part that cooperates with the anti-rotation part to restrict the circumferential rotation of the nut.

7. The electric valve as described in claim 5, characterized in that, The valve core extends at least partially out of the guide groove, and the outer side wall of the valve core is also provided with a second limiting protrusion. The second limiting protrusion is used to cooperate with the lower end face of the upper valve seat to stop the valve core when it moves away from the valve port, so as to limit the valve core to the upper limit position.

8. The electric valve as described in claim 5, characterized in that, At the upper limit position, a cavity is defined between the valve core and the inner wall of the guide groove; The electric valve also includes a housing, which is mounted on the side of the upper valve seat opposite to the lower valve seat, so as to form a mounting cavity for mounting the rotor assembly. The upper valve seat is provided with a first communication channel connecting the mounting cavity and the cavity; The valve core assembly is provided with a second communication channel connecting the cavity and the valve cavity.

9. The electric valve as described in claim 8, characterized in that, The limiting sleeve is recessed at one end facing the spring, and at least one first connecting hole is provided at the bottom of the limiting groove. A first communicating groove is defined between the outer wall of the nut and the hole wall of the valve core, and the first communicating groove connects the cavity and the limiting groove. The second connecting channel includes the first connecting hole, the limiting groove, and the first connecting slot.

10. The electric valve as described in claim 9, characterized in that, The first limiting protrusion is arranged in a ring shape, and at least one vent groove is provided on the first limiting protrusion, the vent groove connecting the through hole and the limiting groove.

11. The electric valve as described in claim 9, characterized in that, The valve core assembly also includes a filter screen disposed corresponding to the first connecting hole.

12. The electric valve as claimed in claim 11, characterized in that, The filter screen is located at the bottom of the limiting groove, and the filter screen is located at the end of the spring that is away from the nut.

13. The electric valve as claimed in claim 1, characterized in that, The valve core assembly also includes a sealing ring; The outer wall of the valve core is recessed with a sealing groove along its circumference, and the sealing ring is installed in the sealing groove.

14. A refrigeration device, characterized in that, Includes the electric valve as described in any one of claims 1 to 13.

15. The refrigeration equipment as described in claim 14, characterized in that, The refrigeration equipment includes an air conditioner.

Images