Electronic expansion valve and air conditioner refrigerating system

Abstract

The invention relates to an electronic expansion valve and an air conditioner refrigerating system.The electronic expansion valve comprises a rotor assembly, a lead screw, a valve element assembly and a valve seat assembly, the valve seat assembly is provided with a valve cavity, the valve element assembly is movably arranged in the valve cavity, one end of the lead screw is fixedly connected to the rotor assembly, and the other end of the lead screw is connected to the valve element assembly; the rotor assembly can drive the lead screw to drive the valve element assembly to axially move relative to the valve seat assembly. The valve element assembly comprises a main element body, a first throttling element, a second throttling element and an elastic component, the main element body is sleeved with the first throttling element and the second throttling element, and the elastic component is located between the first throttling element and the second throttling element. The valve seat assembly comprises a second valve port and a fourth valve port; and after the fourth valve port is closed by the second throttling element, the rotor assembly can continuously drive the screw rod to drive the main core body and the first throttling element to move and compress the elastic component until the second valve port is closed by the first throttling element. According to the electronic expansion valve provided by the invention, the problem that a plurality of valve port parts are easy to fail in sealing is solved.

Description

Technical Field

[0001] The present application relates to the technical field of valve bodies, and particularly to an electronic expansion valve and an air-conditioning refrigeration system. Background Art

[0002] As a new type of control element, the electronic expansion valve has long broken through the concept of a throttling mechanism. It is an important link in the intelligentization of the refrigeration system, an important means and guarantee for the real realization of the optimization of the refrigeration system, and a symbol of the mechatronics of the refrigeration system, and has been applied in more and more fields.

[0003] In order to increase the connection modes of the electronic expansion valve, multiple axially arranged valve orifice parts are provided in the valve seat assembly of the existing electronic expansion valve. Correspondingly, multiple axially arranged sealing washers are sleeved outside the valve core assembly, and each sealing washer needs to be independently installed at the corresponding position of the valve core assembly. In this way, the accuracy requirements for the installation position of the sealing washer are extremely high, and the position of the sealing washer cannot be changed after being set. The multiple sealing washers correspond to the multiple valve orifice parts one by one and reach the sealing state at the same time. When there are machining and assembly errors in the dimensions between the valve orifice parts, the sealing of the valve orifice parts will fail. Summary of the Invention

[0004] Based on this, it is necessary to provide an electronic expansion valve and an air-conditioning refrigeration system to solve the problem that the multiple valve orifice parts of the existing electronic expansion valve are prone to sealing failure.

[0005] The electronic expansion valve provided by the present application includes a rotor assembly, a lead screw, a valve core assembly, and a valve seat assembly. The valve seat assembly is provided with a valve cavity, the valve core assembly is movably arranged in the valve cavity, one end of the lead screw is fixedly connected to the rotor assembly, and the other end is connected to the valve core assembly, and the rotor assembly can drive the lead screw to drive the valve core assembly to axially move relative to the valve seat assembly. The valve core assembly includes a main core body, a first throttling member, a second throttling member, and an elastic member. The first throttling member and the second throttling member are sleeved outside the main core body, and the elastic member is located between the first throttling member and the second throttling member. The valve seat assembly includes a second valve orifice and a fourth valve orifice; when the second throttling member closes the fourth valve orifice, the rotor assembly can continue to drive the lead screw to drive the main core body and the first throttling member to move and compress the elastic member until the first throttling member closes the second valve orifice.

[0006] In one embodiment, the outer wall of the main core body is provided with a mounting ring groove extending around its own axis, and the mounting ring groove includes a first side wall, a second side wall and a mounting bottom wall, the first side wall is provided at one end of the mounting ring groove close to the rotor assembly, the second side wall is provided at one end of the mounting ring groove away from the rotor assembly, and the mounting bottom wall is a part of the outer wall of the main core body and is provided between the first side wall and the second side wall. The valve core assembly also includes a movable sleeve, which is located between the first throttle member and the second throttle member; the first throttle member, the movable sleeve and the second throttle member are movably sleeved on the mounting bottom wall in sequence, and the length A of the first throttle member along the axial direction of the main core body, the length B of the second throttle member along the axial direction of the main core body, the length C of the movable sleeve along the axial direction of the main core body, and the distance L between the first side wall and the second side wall along the axial direction of the main core body satisfy, A+B+C <L。

[0007] In one embodiment, 0.05 mm <L-A-B-C<0.5mm。

[0008] In one embodiment, the elastic component includes a first elastic ring and a second elastic ring; the first elastic ring is sleeved on the installation bottom wall and clamped between the first throttling member and the movable sleeve, and the first elastic ring is always in a compressed state; the second elastic ring is sleeved on the installation bottom wall and clamped between the second throttling member and the movable sleeve, and the second elastic ring is always in a compressed state.

[0009] In one embodiment, the valve port portion further includes a first valve port and a third valve port; when the first throttle member closes the first valve port, the rotor assembly can continue to drive the screw rod to drive the main core body and the first throttle member to move and compress the elastic component until the second throttle member closes the third valve port.

[0010] In one embodiment, along the direction from the rotor assembly to the valve seat assembly, the outer wall of the valve seat assembly is also provided with a first interface, a second interface, a third interface and a fourth interface respectively connected to the external pipe, and the first valve port, the first interface, the second valve port, the second interface, the third valve port, the third interface, the fourth valve port and the fourth interface are sequentially distributed along the axial direction of the valve seat assembly. When the rotor assembly drives the valve core assembly to move to the first preset position in the direction away from the rotor assembly through the screw rod, the first throttle can close the second valve port, and the second throttle can close the fourth valve port, the first interface is connected to the fourth interface through the first valve port, and the second interface is connected to the third interface through the third valve port. When the rotor assembly drives the valve core assembly to move to the second preset position in the direction close to the rotor assembly through the screw rod, the first throttle can close the first valve port and the second throttle can close the third valve port, the first interface is connected to the second interface through the second valve port, and the third interface is connected to the fourth interface through the fourth valve port. When the valve core assembly is between the first preset position and the second preset position, the first valve port, the first interface, the second valve port, the second interface, the third valve port, the third interface, the fourth valve port and the fourth interface are connected to each other.

[0011] In one embodiment, the main core body is provided with a first hollow cavity communicating with the fourth interface and a first communication hole communicating with the first hollow cavity and the valve cavity. Moreover, the first communication hole is arranged at one end of the main core body close to the rotor assembly. When the valve core assembly is in the first preset position, the first interface can communicate with the fourth interface in sequence through the first valve port, the valve cavity, the first communication hole and the first hollow cavity.

[0012] In one embodiment, the distance M between the first valve port and the third valve port along the axial direction of the valve seat assembly and the distance N between the second valve port and the fourth valve port along the axial direction of the valve seat assembly satisfy A + B + C ≤ M < L and A + B + C ≤ N < L.

[0013] In one embodiment, the electronic expansion valve further has a first pre-tightening structure. When the lead screw drives the valve core assembly to block the second valve port and the fourth valve port, the first pre-tightening structure can apply a force to the valve core assembly to press the second valve port and the fourth valve port.

[0014] In one embodiment, the valve core assembly further includes a first valve needle and a second valve needle. The lead screw can drive the second valve needle to move along its own axis toward or away from the rotor assembly through the first valve needle, so as to open or close the valve port part. The first pre-tightening structure is a first elastic member. One end of the first elastic member is connected to the lead screw, and the other end is connected to the first valve needle. When the valve core assembly moves to the first preset position, the first valve needle is in contact with the second valve needle, and the first elastic member is in a compressed state.

[0015] In one embodiment, the electronic expansion valve further has a second pre-tightening structure. When the lead screw drives the valve core assembly to block the first valve port and the third valve port, the second pre-tightening structure can apply a force to the valve core assembly to press the first valve port and the third valve port.

[0016] In one embodiment, the second pre-tightening structure is a second elastic member. One end of the second elastic member is connected to the first valve needle, and the other end is connected to the second valve needle. When the rotor assembly drives the valve core assembly to move toward the rotor assembly to the second preset position through the lead screw, the first valve needle is separated from the second valve needle, and the second elastic member is in a compressed state.

[0017] In one embodiment, the electronic expansion valve further includes a stop seat connected to the valve seat assembly. The stop seat is sleeved outside the lead screw. The valve core assembly further includes a sliding nut. One end of the lead screw away from the rotor assembly is in threaded cooperation with the sliding nut. The sliding nut and the stop seat are matched through a limiting structure, so that the lead screw can drive the sliding nut to drive the valve core assembly to move axially relative to the stop seat along the lead screw to open or close the valve port part, and the limiting structure can prevent the sliding nut from rotating around the axis of the lead screw relative to the stop seat.

[0018] The present application also provides an air-conditioning refrigeration system, which includes the electronic expansion valve described in any one of the above embodiments.

[0019] Compared with the prior art, for the electronic expansion valve provided by the present application, the elastic member can respectively apply acting forces in opposite directions to the first throttling member and the second throttling member, increasing the distance between the first throttling member and the second throttling member, so that when the second throttling member seals the fourth valve port, the first throttling member and the second valve port are still in a non-sealed state. At this time, the second throttling member remains stationary, and the main core body can continue to drive the first throttling member to move and compress the elastic member until the first throttling member and the second valve port reach a sealed state. Therefore, the elastic member enables the first throttling member to move relative to the second throttling member, compensating for the errors caused by processing and assembly in the dimensions between the second valve port and the fourth valve port, so that the fourth valve port and the second valve port can be sealed successively. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic structural diagram of an electronic expansion valve according to an embodiment provided by the present application;

[0022] Figure 2 It is a sectional view of an electronic expansion valve according to an embodiment provided by the present application;

[0023] Figure 3 For Figure 2 an enlarged view of the Q shown;

[0024] Figure 4 It is a partial structural schematic diagram of an electronic expansion valve according to another embodiment provided by the present application.

[0025] Reference numerals: 100, rotor assembly; 200, lead screw; 210, limiting protrusion; 300, valve seat assembly; 310, valve cavity; 321, first valve port; 322, second valve port; 323, third valve port; 324, fourth valve port; 331, first interface; 332, second interface; 333, third interface; 334, fourth interface; 400, housing; 510, main core body; 511, first hollow cavity; 512, first communication hole; 521, first side wall; 522, second side wall; 523, mounting bottom wall; 530, first throttle member; 540, second throttle member; 550, movable sleeve; 551, first flange; 552, second flange; 553, sleeve body; 560, first valve needle; 561, second hollow cavity; 562, second communication hole; 570, second valve needle; 580, sliding nut; 590, limiting structure; 610, first elastic ring; 620, second elastic ring; 710, first elastic member; 720, second elastic member; 810, nut seat; 820, limiting sleeve; 830, movable bearing; 840, fixed snap ring; 841, movable cavity; 842, communication gap; 850, stop seat. Detailed implementation manners

[0026] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0027] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0028] In this application, unless otherwise clearly specified or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] In this application, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal level than the second feature.

[0030] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manners.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the technical field to which this application belongs. The terms used herein in the description of this application are only for the purpose of describing specific implementation manners and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] Please refer to Figures 1 - 4 , the electronic expansion valve includes a rotor assembly 100, a lead screw 200, a valve core assembly, and a valve seat assembly 300. One end of the lead screw 200 is fixedly connected to the rotor assembly 100, and the other end is connected to the valve core assembly, and the rotor assembly 100 can drive the lead screw 200 to drive the valve core assembly to move axially relative to the valve seat assembly 300 along the lead screw 200.

[0033] It should be noted that as Figure 1 and Figure 2As shown, the electronic expansion valve further includes a housing 400, which covers the outside of the rotor assembly 100, part of the lead screw 200, and part of the valve core assembly and is welded to the valve seat.

[0034] In one embodiment, the lead screw 200 and the valve core assembly are movably threadedly engaged.

[0035] Further, as Figure 2 shown, the valve core assembly includes a main core body 510, a movable sleeve 550, a first throttle member 530, and a second throttle member 540. Among them, the first throttle member 530 and the second throttle member 540 are respectively used to open or close the valve port portions distributed along the axial direction of the valve seat assembly 300. An installation ring groove extending around its own axis is provided on the outer wall of the main core body 510. The installation ring groove includes a first side wall 521, a second side wall 522, and an installation bottom wall 523. Among them, the first side wall 521 is provided at one end of the installation ring groove close to the rotor assembly 100, the second side wall 522 is provided at one end of the installation ring groove far from the rotor assembly 100, and the installation bottom wall 523 is a part of the outer wall of the main core body 510 and is provided between the first side wall 521 and the second side wall 522. Along the direction from the rotor assembly 100 to the valve seat assembly 300, the first throttle member 530, the movable sleeve 550, and the second throttle member 540 are sequentially movably sleeved on the installation bottom wall 523, and the length A of the first throttle member 530 along the axial direction of the main core body 510, the length B of the second throttle member 540 along the axial direction of the main core body 510, the length C of the movable sleeve 550 along the axial direction of the main core body 510, and the distance L between the first side wall 521 and the second side wall 522 along the axial direction of the main core body 510 satisfy A + B + C < L.

[0036] Specifically, in one embodiment, 0.05 mm < L - A - B - C < 0.5 mm.

[0037] It should be noted that the rotor assembly 100, the lead screw 200, the main core body 510, the movable sleeve 550, the first throttle member 530, the second throttle member 540, and the valve seat assembly 300 are all coaxially arranged.

[0038] Specifically, the first flow component 530 and the second flow component 540 are elastic components, and the movable sleeve 550 is a rigid component. For example, the first flow component 530 and the second flow component 540 can be rubber components, silica gel components or soft plastic components, and the movable sleeve 550 can be a hard plastic component or a metal component. In this way, it is beneficial for the first flow component 530 and the second flow component 540 to seal the valve orifice, preventing leakage of the electronic expansion valve. Moreover, the rigid movable sleeve 550 is beneficial for effectively supporting the first flow component 530 and the second flow component 540, preventing eccentricity of the first flow component 530 and the second flow component 540. First, with such a setting, the valve core assembly can be driven by the lead screw 200 to move towards or away from the rotor assembly 100, so as to respectively control the opening or closing of the first valve orifice 321, the second valve orifice 322, the third valve orifice 323 and the fourth valve orifice 324, thereby realizing the mutual connection between the four external communication ports of the first interface 331, the second interface 332, the third interface 333 and the fourth interface 334, that is, realizing the four-way function of the electronic expansion valve.

[0039] Further, since A + B + C < L, therefore, the first flow component 530, the movable sleeve 550 and the second flow component 540 can be more easily installed in the installation ring groove. Also, because along the direction from the rotor assembly 100 to the valve seat assembly 300, the first flow component 530, the movable sleeve 550 and the second flow component 540 are sequentially and movably sleeved on the installation bottom wall 523. Therefore, when there is a deviation in the size between the first valve orifice 321 or the third valve orifice 323, or a deviation in the size between the second valve orifice 322 and the fourth valve orifice 324, the first flow component 530 and the second flow component 540 can move relative to each other, so as to successively realize the closing effect of the first flow component 530 and the second flow component 540 on the valve orifice. As can be seen from the above, with such a setting, the double-sealing effect of the first flow component 530 and the second flow component 540 is improved.

[0040] Specifically, in one embodiment, 0.05 mm < L - A - B - C < 0.5 mm, that is, the range of the installation gap is between 0.05 mm and 0.5 mm. Preferably, L - A - B - C is 0.1 mm. The difference gap of L - A - B - C can be used to install the elastic component between the first flow component 530 and the second flow component 540.

[0041] In one embodiment, in order to facilitate the installation of the first flow component 530, the second flow component 540 and the movable sleeve 550, the second side wall 522 is a welded component. In this way, the first flow component 530, the second flow component 540 and the movable sleeve 550 can be first sleeved on the installation bottom wall 523, and then the welded component is welded to one end of the main core body 510 to enclose and form the installation ring groove.

[0042] In order to improve the supporting effect of the movable sleeve 550 on the first throttle member 530 and the second throttle member 540, in one embodiment, as shown in FIG. Figure 2 As shown, the movable sleeve 550 includes a first flange 551, a second flange 552 and a sleeve body 553, and the sleeve body 553 is sleeved on the main core body 510, and the first flange 551 and the second flange 552 are respectively connected to the two ends of the sleeve body 553 along the axial direction of the main core body 510, and one end of the sleeve body 553 extends along its own radial direction away from the main core body 510 to form the first flange 551, and the first throttling member 530 is arranged between the first flange 551 and the first side wall 521, and the other end of the sleeve body 553 extends along its own radial direction away from the main core body 510 to form the second flange 552, and the second throttling member 540 is arranged between the second flange 552 and the second side wall 522.

[0043] In this way, the contact area between the movable sleeve 550 and the first throttle member 530 is increased, and the contact area between the movable sleeve 550 and the second throttle member 540 is increased, thereby preventing the first throttle member 530 and the second throttle member 540 from deforming and moving to the outside of the movable sleeve 550 under the squeezing of the movable sleeve 550, causing the electronic expansion valve to be unable to achieve sealing.

[0044] Specifically, the first flange 551, the second flange 552 and the sleeve body 553 are integrally formed parts. For example, the first flange 551, the second flange 552 and the sleeve body 553 can be integrally turned parts, integrally injected parts, integrally cast parts or 3D printed parts.

[0045] Further, in one embodiment, if Figure 2 As shown, along the direction from the rotor assembly 100 to the valve seat assembly 300, the valve port portion includes a first valve port 321, a second valve port 322, a third valve port 323 and a fourth valve port 324 which are distributed in sequence, and the outer wall of the valve seat assembly 300 is also provided with a first interface 331, a second interface 332, a third interface 333 and a fourth interface 334 which are respectively connected to the external connecting pipe, and the first valve port 321, the first interface 331, the second valve port 322, the second interface 332, the third valve port 323, the third interface 333, the fourth valve port 324 and the fourth interface 334 are distributed in sequence along the axial direction of the valve seat assembly 300.

[0046] When the rotor assembly 100 drives the valve core assembly to move to a first preset position in a direction away from the rotor assembly 100 through the screw rod 200, the first throttle member 530 can close the second valve port 322, and the second throttle member 540 can close the fourth valve port 324, and the first interface 331 is connected to the fourth interface 334 through the first valve port 321, and the second interface 332 is connected to the third interface 333 through the third valve port 323.

[0047] It should be noted that in this embodiment, as Figure 2 shown, the valve seat assembly 300 is provided with a valve cavity 310, the valve core assembly is movably disposed in the valve cavity 310, the main core body 510 is provided with a first hollow cavity 511 communicating with the fourth interface 334 and a first communication hole 512 communicating the first hollow cavity 511 and the valve cavity 310, and the first communication hole 512 is disposed at one end of the main core body 510 close to the rotor assembly 100. When the valve core assembly is in the first preset position, the first interface 331 can communicate with the fourth interface 334 through the first valve port 321, the valve cavity 310, the first communication hole 512 and the first hollow cavity 511 in sequence.

[0048] When the rotor assembly 100 drives the valve core assembly to move towards the direction close to the rotor assembly 100 to the second preset position through the lead screw 200, the first throttle member 530 can close the first valve port 321 and the second throttle member 540 can close the third valve port 323, and the first interface 331 communicates with the second interface 332 through the second valve port 322, and the third interface 333 communicates with the fourth interface 334 through the fourth valve port 324.

[0049] When the valve core assembly is between the first preset position and the second preset position, the first valve port 321, the first interface 331, the second valve port 322, the second interface 332, the third valve port 323, the third interface 333, the fourth valve port 324 and the fourth interface 334 communicate with each other.

[0050] It should be noted that the outer wall of the valve seat assembly 300 includes the side wall and the bottom wall of the valve seat assembly 300, that is, the fourth interface 334 can be disposed on the side wall of the valve seat assembly 300, or can be disposed at the end of the valve seat assembly 300 away from the rotor assembly 100, that is, on the bottom wall of the valve seat assembly 300.

[0051] Furthermore, in one embodiment, as Figure 2 shown, the electronic expansion valve further includes an elastic member. The first throttle member 530 and the second throttle member 540 are sleeved outside the main core body 510, and the elastic member is located between the first throttle member 530 and the second throttle member 540; the valve seat assembly 300 includes the second valve port 322 and the fourth valve port 324; when the second throttle member 540 closes the fourth valve port 324, the rotor assembly 100 can continue to drive the lead screw 200 to drive the main core body 510 and the first throttle member 530 to move and compress the elastic member until the first throttle member 530 closes the second valve port 322.

[0052] With such a setting, the elastic member can respectively apply acting forces in opposite directions to the first throttle member 530 and the second throttle member 540, increasing the distance between the first throttle member 530 and the second throttle member 540, so that when the second throttle member 540 seals the fourth valve port 324, the first throttle member 530 and the second valve port 322 are still in an unsealed state. At this time, the second throttle member 540 remains stationary, and the main core body 510 can continue to drive the first throttle member 530 to move and compress the elastic member until the first throttle member 530 and the second valve port 322 reach a sealed state. Therefore, the elastic member enables the first throttle member 530 to move relative to the second throttle member 540, compensating for the errors in the dimensions between the second valve port 322 and the fourth valve port 324 caused by processing and assembly, so that the fourth valve port 324 and the second valve port 322 can be sealed successively.

[0053] In one embodiment, the elastic member includes a first elastic ring 610 and a second elastic ring 620. The first elastic ring 610 is sleeved on the installation bottom wall 523 and clamped between the first throttle member 530 and the movable sleeve 550 to respectively apply elastic acting forces in opposite directions to the first throttle member 530 and the movable sleeve 550. The second elastic ring 620 is sleeved on the installation bottom wall 523 and clamped between the second throttle member 540 and the movable sleeve 550 to respectively apply elastic acting forces in opposite directions to the second throttle member 540 and the movable sleeve 550. To ensure that the first valve port 321 and the third valve port 323 are sealed simultaneously or successively, and the distance M along the axis of the valve seat assembly 300 between the first valve port 321 and the third valve port 323 satisfies A + B + C ≤ M < L. To ensure that the second valve port 322 and the fourth valve port 324 are sealed simultaneously or successively, and the distance N along the axis of the valve seat assembly 300 between the second valve port 322 and the fourth valve port 324 satisfies A + B + C ≤ N < L.

[0054] When the seal uses the first elastic ring 610 and the second elastic ring 620, and the movable sleeve 550 is made of rigid material, the first elastic ring 610 can not only seal the first throttle member 530 and the main core body 510, but also provide a certain amount of elastic deformation to compensate for the deviation distance between the two valve ports. The second elastic ring 620 can not only seal the second throttle member 540 and the main core body 510, but also provide a certain amount of elastic deformation to compensate for the deviation distance between the two valve ports. When the seal uses the first elastic ring 610 and the second elastic ring 620, the movable sleeve 550 can also be replaced with an elastic structure (including but not limited to a compression spring and a shrapnel structure). The first elastic ring 610 can not only seal the first throttle member 530 and the main core body 510, but also provide a certain amount of elastic deformation to compensate for the deviation distance between the two valve ports. The second elastic ring 620 can not only seal the second throttle member 540 and the main core body 510, but also provide a certain amount of elastic deformation to compensate for the deviation distance between the two valve ports. In addition, the elastic deformation of the movable sleeve 550 can also compensate for the deviation distance between the two valve ports.

[0055] In order to reduce costs, the first elastic ring 610 and the second elastic ring 620 can be O-rings.

[0056] Since the first elastic ring 610 can apply elastic forces in opposite directions to the first throttle member 530 and the movable sleeve 550 respectively, and the second elastic ring 620 can apply elastic forces in opposite directions to the second throttle member 540 and the movable sleeve 550 respectively, therefore, without being affected by other external forces and only under the elastic expansion of the first elastic ring 610 and the second elastic ring 620, the first throttle member 530 will move away from the movable sleeve 550 and firmly abut against the first side wall 521, and the second throttle member 540 will move away from the movable sleeve 550 and firmly abut against the second side wall 522. With such a setting, the value of L-A-B-C can be reduced, and the movement stroke of the main core 510 can be reduced. Specifically, when the second throttle member 540 seals the fourth valve port 324, the second throttle member 540 remains stationary, and the main core 510 still moves axially towards the fourth valve port 324. The first side wall 521 of the main core 510 drives the first throttle member 530 to move simultaneously until the first throttle member 530 seals the second valve port 322. Without being affected by other external forces, assuming that the first throttle member 530 is at a certain distance from the first side wall 521, when the second throttle member 540 seals the fourth valve port 324, the second throttle member 540 remains stationary, and the main core 510 needs to move axially towards the fourth valve port 324 by a certain distance before the first side wall 521 of the main core 510 drives the first throttle member 530 to move simultaneously until the first throttle member 530 seals the second valve port 322. Therefore, without being affected by other external forces, the first throttle member 530 abuts against the first side wall 521, which can reduce the movement stroke of the main core 510. The principle of the second throttle member 540 abutting against the second side wall 522 without being affected by other external forces is similar.

[0057] When the rotor assembly 100 drives the valve core assembly to move towards the first preset position away from the rotor assembly 100 through the lead screw 200, since N < L and the fourth valve port 324 is provided at one end of the second valve port 322 away from the rotor assembly 100, the distance between the surface of the first throttle member 530 for sealing the second valve port 322 and the surface of the second throttle member 540 for sealing the fourth valve port 324 is greater than N. Therefore, the second throttle member 540 first contacts the fourth valve port 324. At this time, the first throttle member 530 has not yet contacted the second valve port 322. After that, the valve core assembly continues to move away from the rotor assembly 100. Since A + B + C ≤ N, the first elastic ring 610 and the second elastic ring 620 will be compressed until the first throttle member 530 contacts and seals the second valve port 322. In this way, the complete closing of the second valve port 322 and the fourth valve port 324 is achieved.

[0058] Similarly, when the rotor assembly 100 drives the valve core assembly to move towards the second preset position in the direction close to the rotor assembly 100 through the lead screw 200, since M < L, and the first valve port 321 is provided at one end of the third valve port 323 close to the rotor assembly 100, the distance between the surface of the first throttle member 530 for sealing the first valve port 321 and the surface of the second throttle member 540 for sealing the third valve port 323 is greater than M. Therefore, the first throttle member 530 first contacts the first valve port 321. At this time, the second throttle member 540 has not yet contacted the third valve port 323. After that, the valve core assembly continues to move in the direction close to the rotor assembly 100. Since A + B + C ≤ M, the first elastic ring 610 and the second elastic ring 620 will be compressed until the second throttle member 540 contacts and seals the third valve port 323. In this way, the complete closing of the first valve port 321 and the third valve port 323 is achieved.

[0059] Therefore, from the above, by setting A + B + C ≤ M < L and A + B + C ≤ N < L, and setting the first elastic ring 610 and the second elastic ring 620, it is possible to ensure the sealing setting of the two valve ports, avoid the situation where one of the valve ports cannot be sealed due to machining errors, and thus greatly ensure the sealing performance of the electronic expansion valve.

[0060] It should be noted that, in order to further increase the connection modes of the electronic expansion valve, in one embodiment, the number of installation annular grooves is multiple, and the multiple installation annular grooves are distributed along the axial direction of the main core body 510.

[0061] Since the number of valve ports included in the valve port part provided in each installation annular groove is 4, which is essentially a four-way valve with two groups of valve ports. Therefore, by setting multiple installation annular grooves, the electronic expansion valve can be changed into a multi-way valve with a multiple of 4, such as an eight-way valve, a twelve-way valve or a sixteen-way valve. However, it is not limited to this. In other embodiments, through the cooperation of the installation annular groove and other structures, the design and manufacture of multi-way valves other than multiples of 4 can also be realized, which will not be listed one by one here.

[0062] In one embodiment, as Figure 2 shown, the electronic expansion valve further has a first pre-tightening structure and a second pre-tightening structure. When the lead screw 200 drives the valve core assembly to block the second valve port 322 and the fourth valve port 324, the first pre-tightening structure can apply a force to the valve core assembly to press the second valve port 322 and the fourth valve port 324; when the lead screw 200 drives the valve core assembly to block the first valve port 321 and the third valve port 323, the second pre-tightening structure can apply a force to the valve core assembly to press the first valve port 321 and the third valve port 323.

[0063] In this way, the pre-tightening force of the valve core assembly on the first valve port 321 or the second valve port 322 can be improved, and further the sealing performance of the electronic expansion valve can be improved.

[0064] Further, in one embodiment, as Figure 2 shown, the electronic expansion valve further includes a nut seat 810 connected to the valve seat assembly 300. The nut seat 810 is sleeved on the outer periphery of the lead screw 200 and is in movable threaded cooperation with the lead screw 200, so that the lead screw 200 can move axially relative to the nut seat 810 along its own axis. The valve core assembly further includes a first valve needle 560 and a second valve needle 570. The lead screw 200 can drive the second valve needle 570 to move along its own axis in a direction close to or away from the rotor assembly 100 through the first valve needle 560, so as to open or close the valve port.

[0065] It should be noted that the second valve needle 570 includes a main core body 510, a movable sleeve 550, a first throttle member 530 and a second throttle member 540.

[0066] However, it is not limited thereto. In another embodiment, as Figure 4 shown, the electronic expansion valve further includes a stop seat 850 connected to the valve seat assembly 300. The stop seat 850 is sleeved outside the lead screw 200. The valve core assembly further includes a sliding nut 580. One end of the lead screw 200 away from the rotor assembly 100 is in threaded cooperation with the sliding nut 580. The sliding nut 580 and the stop seat 850 are matched through a limiting structure 590, so that the lead screw 200 can drive the sliding nut 580 to drive the valve core assembly to move axially relative to the stop seat 850 along the lead screw 200 to open or close the valve port, and the limiting structure 590 can prevent the sliding nut 580 from rotating around the axis of the lead screw 200 relative to the stop seat 850.

[0067] Furthermore, in one embodiment, as Figure 2 shown, the first pre-tightening structure is a first elastic member 710. One end of the first elastic member 710 is connected to the lead screw 200, and the other end is connected to the first valve needle 560. The connection here can be abutting or fixed connection. The first elastic member 710 is a compression elastic member, so that the lead screw 200 and the first valve needle 560 can be in movable cooperation along the axis of the lead screw 200 through the first elastic member 710.

[0068] When the spool assembly moves to the first preset position and the rotor assembly 100 continues to rotate along the preset direction, the first valve needle 560 fits with the second valve needle 570, and the first elastic member 710 is in a compressed state. Neither the first valve needle 560 nor the second valve needle 570 can move further. Since the lead screw 200 and the first valve needle 560 can be axially movably engaged through the first elastic member 710 along the axial direction of the lead screw 200, the lead screw 200 and the rotor assembly 100 move toward the direction close to the fourth valve port 324. Moreover, during the movement of the lead screw 200, the first elastic member 710 is compressed. Under the push of the reaction force, the first elastic member 710 generates an elastic force on the second valve needle 570, and this elastic force causes the first valve needle 560 to further press against the second valve port 322 and the fourth valve port 324, so as to generate a pre-tightening force on the second valve port 322 and the fourth valve port 324, improving the sealing performance of the second valve port 322 and the fourth valve port 324.

[0069] Specifically, as Figure 2 shown, the electronic expansion valve further includes a limit sleeve 820. A limit protrusion 210 is provided at one end of the lead screw 200 away from the rotor assembly 100. One end of the limit sleeve 820 is fixedly connected to the first valve needle 560, and the other end is sleeved on the first elastic member 710 and abuts against the side of the limit protrusion 210 away from the first valve needle 560, so that the lead screw 200 can drive the limit sleeve 820 and the first valve needle 560 to move away from the fourth valve port 324 through the limit protrusion 210.

[0070] In this way, the axial cooperation between the lead screw 200 and the first valve needle 560 has a limit. When the lead screw 200 drives the first valve needle 560 to move away from the fourth valve port 324, the first elastic member 710 does not need to act. Only the limit sleeve 820 is needed to drive the first valve needle 560 to move. Moreover, at this time, the distance between the first valve needle 560 and the lead screw 200 will not increase. On the contrary, when the lead screw 200 drives the first valve needle 560 to move toward the direction close to the fourth valve port 324, the limit sleeve 820 does not act, and the lead screw 200 applies an elastic force (pressure) to the first valve needle 560 by the first elastic member 710, so that the second valve needle 570 plays a pre-tightening role.

[0071] Furthermore, as Figure 2 shown, the electronic expansion valve further includes a movable bearing 830. The inner ring of the movable bearing 830 is fixedly sleeved on the lead screw 200, and the outer ring of the movable bearing 830 can be axially movably engaged with the limit sleeve 820, and the inner wall of the limit sleeve 820 can prevent the outer ring of the movable bearing 830 from rotating.

[0072] With such a setting, it is beneficial to reduce the frictional resistance between the lead screw 200 and the limit sleeve 820, thereby reducing the rotational resistance of the electronic expansion valve.

[0073] In one embodiment, as Figure 2 shown, the second pre-tightening structure is a second elastic member 720. One end of the second elastic member 720 is connected to the first valve needle 560, and the other end is connected to the second valve needle 570. The connection here can be abutting or fixed connection. The second elastic member 720 is a compression elastic member, so that the first valve needle 560 and the second valve needle 570 can be movably matched along the axial direction of the lead screw 200 through the second elastic member 720.

[0074] When the valve core assembly moves to the second preset position and the rotor assembly 100 continues to rotate along the preset direction, the first valve needle 560 is separated from the second valve needle 570, and the second elastic member 720 is in a compressed state. The second valve needle 570 cannot move further. Since the first valve needle 560 and the second valve needle 570 can be movably matched along the axial direction of the lead screw 200 through the second elastic member 720, at this time, the lead screw 200 drives the first valve needle 560 to disengage from the second valve needle 570 and move away from the fourth valve port 324. And, during the movement of the lead screw 200, the first valve needle 560 is driven to squeeze the second elastic member 720, so that the second elastic member 720 generates an elastic force on the second valve needle 570, and this elastic force can drive the second valve needle 570 to further squeeze the first valve port 321 and the third valve port 323, so that the second valve needle 570 generates a pre-tightening force on the first valve port 321 and the third valve port 323, improving the sealing performance of the first valve port 321 and the second valve port 322.

[0075] Specifically, as Figure 2 and Figure 3 shown, the electronic expansion valve further includes a fixed snap ring 840. The fixed snap ring 840 is fixedly connected to the second valve needle 570 and encloses an activity cavity 841 with the second valve needle 570. The second elastic member 720 is arranged in the activity cavity 841, and one end of the second elastic member 720 away from the rotor assembly 100 abuts against the first valve needle 560, and one end of the second elastic member 720 close to the rotor assembly 100 abuts against the fixed snap ring 840.

[0076] In this way, the axial cooperation between the first valve needle 560 and the second valve needle 570 is limited. When the lead screw 200 drives the first valve needle 560 to move towards the fourth valve port 324, the second elastic member 720 does not need to act. At this time, the first valve needle 560 directly pushes the second valve needle 570 to move. On the contrary, when the lead screw 200 drives the first valve needle 560 to move away from the fourth valve port 324, the first valve needle 560 applies an elastic force (pressure) to the second valve needle 570 through the second elastic member 720, so that the second valve needle 570 plays a pre-tightening role.

[0077] Furthermore, in one embodiment, the first elastic member 710 is a compression spring and the second elastic member 720 is also a compression spring.

[0078] In this way, the processing difficulty of the first elastic member 710 and the second elastic member 720 is significantly reduced.

[0079] It should be noted that the first hollow cavity 511 is provided in the second valve needle 570.

[0080] In one embodiment, as Figure 2 and Figure 3 shown, the first valve needle 560 is provided with a second hollow cavity 561 communicating with the first hollow cavity 511 and a second communication hole 562 communicating with the second hollow cavity 561 and the movable cavity 841. Moreover, a communication gap 842 is formed by arranging the fixed snap ring 840 and the first valve needle 560 at intervals, and the communication gap 842 communicates the movable cavity 841 and one end of the valve cavity 310 close to the rotor assembly 100.

[0081] With such an arrangement, one end of the valve cavity 310 far from the rotor assembly 100 can be communicated with one end of the valve cavity 310 close to the rotor assembly 100 through the first hollow cavity 511, the second hollow cavity 561, the second communication hole 562, the movable cavity 841 and the communication gap 842 in sequence. In this way, when the valve core assembly moves relative to the valve seat assembly 300, the pressure balance can be maintained at various parts of the valve cavity 310, and the moving resistance of the valve core assembly can be reduced.

[0082] The specific principle is as follows: In the initial state, the first throttle member 530 is in contact with the first side wall 521, and the second throttle member 540 is in contact with the second side wall 522. There is a certain elastic distance D1 between the first throttle member 530 and the first elastic ring 610, and there is a certain elastic distance D2 between the second throttle member 540 and the second elastic ring 620. When the rotor assembly 100 drives the valve core assembly to move away from the rotor assembly 100 through the lead screw 200, the second throttle member 540 first seals with the fourth valve port 324. After that, the second throttle member 540 remains stationary, and the main core body 510 drives the first throttle member 530 to move. The first elastic ring 610 and the second elastic ring 620 are compressed until the rotor assembly 100 moves to the first preset position, and the first throttle member 530 seals with the second valve port 322. At this time, there is a certain elastic distance D3 between the second throttle member 540 and the second side wall 522, and D3 can be equal to D1 + D2. After that, the rotor assembly 100 drives the valve core assembly to move towards the direction close to the rotor assembly 100 through the lead screw 200. The second throttle member 540 remains stationary, and the main core body 510 first moves D3. At this time, the elastic distance D1 is restored between the first throttle member 530 and the first elastic ring 610, and the elastic distance D2 is restored between the second throttle member 540 and the second elastic ring 620. Then, it drives the first throttle member 530 and the second throttle member 540 to move as a whole until the first throttle member 530 seals the first valve port 321. After that, the first throttle member 530 remains stationary, and the main core body 510 drives the second throttle member 540 to move. The first elastic ring 610 and the second elastic ring 620 are compressed until the rotor assembly 100 moves to the second preset position, and the second throttle member 540 seals with the third valve port 323. At this time, there is a certain elastic distance D4 between the first throttle member 530 and the first side wall 521, and D4 can be equal to D1 + D2. The present application also provides an air-conditioning refrigeration system, and this air-conditioning refrigeration system includes the electronic expansion valve described in any one of the above embodiments.

[0083] The technical features of the above-mentioned embodiments can be combined arbitrarily. For the sake of brief description, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0084] The above-mentioned embodiments only express several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An electronic expansion valve, characterized in that, It includes a rotor assembly (100), a lead screw (200), a valve core assembly and a valve seat assembly (300). The valve seat assembly (300) is provided with a valve cavity (310). The valve core assembly is movably arranged in the valve cavity (310). One end of the lead screw (200) is fixedly connected to the rotor assembly (100), and the other end is connected to the valve core assembly. Moreover, the rotor assembly (100) can drive the lead screw (200) to drive the valve core assembly to axially move relative to the valve seat assembly (300); The valve core assembly includes a main core body (510), a first throttle member (530), a second throttle member (540) and an elastic member. The first throttle member (530) and the second throttle member (540) are sleeved outside the main core body (510), and the elastic member is located between the first throttle member (530) and the second throttle member (540); The valve seat assembly (300) is provided with a second valve port (322) and a fourth valve port (324); after the second throttle member (540) closes the fourth valve port (324), the rotor assembly (100) can continue to drive the lead screw (200) to drive the main core body (510) and the first throttle member (530) to move and compress the elastic member until the first throttle member (530) closes the second valve port (322).

2. The electronic expansion valve according to claim 1, wherein The outer wall of the main core body (510) is provided with a mounting ring groove extending around its own axis. The mounting ring groove includes a first side wall (521), a second side wall (522) and a mounting bottom wall (523). The first side wall (521) is arranged at one end of the mounting ring groove close to the rotor assembly (100), the second side wall (522) is arranged at one end of the mounting ring groove far from the rotor assembly (100), and the mounting bottom wall (523) is a part of the outer wall of the main core body (510) and is arranged between the first side wall (521) and the second side wall (522); The valve core assembly further includes a movable sleeve (550). The movable sleeve (550) is located between the first throttle member (530) and the second throttle member (540); the first throttle member (530), the movable sleeve (550) and the second throttle member (540) are sequentially movably sleeved on the mounting bottom wall (523), and the length A of the first throttle member (530) along the axis of the main core body (510), the length B of the second throttle member (540) along the axis of the main core body (510), the length C of the movable sleeve (550) along the axis of the main core body (510), and the distance L between the first side wall (521) and the second side wall (522) along the axis of the main core body (510) satisfy A + B + C < L.

3. The electronic expansion valve according to claim 2, wherein, 0.05mm < L - A - B - C < 0.5mm.

4. The electronic expansion valve according to claim 2, wherein The elastic member includes a first elastic ring (610) and a second elastic ring (620); The first elastic ring (610) is sleeved on the mounting bottom wall (523) and clamped between the first throttle member (530) and the movable sleeve (550), and the first elastic ring (610) is always in a compressed state; The second elastic ring (620) is sleeved on the mounting bottom wall (523) and clamped between the second throttle member (540) and the movable sleeve (550), and the second elastic ring (620) is always in a compressed state.

5. The electronic expansion valve according to claim 1, characterized in that, The valve port part further includes a first valve port (321) and a third valve port (323); after the first throttle member (530) closes the first valve port (321), the rotor assembly (100) can continue to drive the lead screw (200) to drive the main core body (510) and the first throttle member (530) to move and compress the elastic member until the second throttle member (540) closes the third valve port (323).

6. The electronic expansion valve according to claim 5, characterized in that, Along the direction from the rotor assembly (100) to the valve seat assembly (300), the outer wall of the valve seat assembly (300) is further provided with a first interface (331), a second interface (332), a third interface (333) and a fourth interface (334) respectively connected to external connecting pipes, and the first valve port (321), the first interface (331), the second valve port (322), the second interface (332), the third valve port (323), the third interface (333), the fourth valve port (324) and the fourth interface (334) are sequentially distributed along the axial direction of the valve seat assembly (300); When the rotor assembly (100) drives the valve core assembly to move away from the rotor assembly (100) to a first preset position through the lead screw (200), the first throttle member (530) can close the second valve port (322), and the second throttle member (540) can close the fourth valve port (324), the first interface (331) communicates with the fourth interface (334) through the first valve port (321), and the second interface (332) communicates with the third interface (333) through the third valve port (323); When the rotor assembly (100) drives the valve core assembly to move towards the rotor assembly (100) to a second preset position through the lead screw (200), the first throttle member (530) can close the first valve port (321) and the second throttle member (540) can close the third valve port (323), the first interface (331) communicates with the second interface (332) through the second valve port (322), and the third interface (333) communicates with the fourth interface (334) through the fourth valve port (324); When the valve core assembly is between the first preset position and the second preset position, the first valve port (321), the first interface (331), the second valve port (322), the second interface (332), the third valve port (323), the third interface (333), the fourth valve port (324) and the fourth interface (334) are in communication with each other.

7. The electronic expansion valve according to claim 6, wherein The main core body (510) is provided with a first hollow cavity (511) communicating with the fourth interface (334) and a first communication hole (512) communicating with the first hollow cavity (511) and the valve cavity (310). Moreover, the first communication hole (512) is provided at one end of the main core body (510) close to the rotor assembly (100). When the valve core assembly is in the first preset position, the first interface (331) can communicate with the fourth interface (334) through the first valve port (321), the valve cavity (310), the first communication hole (512) and the first hollow cavity (511) in sequence.

8. The electronic expansion valve according to claim 6, characterized in that, The axial distance M between the first valve port (321) and the third valve port (323) along the valve seat assembly (300) and the axial distance N between the second valve port (322) and the fourth valve port (324) along the valve seat assembly (300) satisfy A + B + C ≤ M < L and A + B + C ≤ N < L.

9. The electronic expansion valve according to claim 5, characterized in that, There is also a first pre-tightening structure. When the lead screw (200) drives the valve core assembly to block the second valve port (322) and the fourth valve port (324), the first pre-tightening structure can apply a force to the valve core assembly to press the second valve port (322) and the fourth valve port (324).

10. The electronic expansion valve according to claim 9, characterized in that, The valve core assembly further includes a first valve needle (560) and a second valve needle (570). The lead screw (200) can drive the second valve needle (570) to move along its own axis in a direction close to or away from the rotor assembly (100) through the first valve needle (560), so as to open or close the valve port part. The first pre-tightening structure is a first elastic member (710). One end of the first elastic member (710) is connected to the lead screw (200), and the other end is connected to the first valve needle (560). When the valve core assembly moves to the first preset position, the first valve needle (560) is in contact with the second valve needle (570), and the first elastic member (710) is in a compressed state.

11. The electronic expansion valve according to claim 10, wherein, There is also a second pre-tightening structure. When the lead screw (200) drives the valve core assembly to block the first valve port (321) and the third valve port (323), the second pre-tightening structure can apply a force to the valve core assembly to press the first valve port (321) and the third valve port (323).

12. The electronic expansion valve according to claim 11, wherein, The second pre-tightening structure is a second elastic member (720). One end of the second elastic member (720) is connected to the first valve needle (560), and the other end is connected to the second valve needle (570). When the rotor assembly (100) drives the valve core assembly to move towards the direction close to the rotor assembly (100) to a second preset position through the lead screw (200), the first valve needle (560) is separated from the second valve needle (570), and the second elastic member (720) is in a compressed state.

13. The electronic expansion valve according to claim 1, wherein The electronic expansion valve further includes a stop seat (850) connected to the valve seat assembly (300). The stop seat (850) is sleeved outside the lead screw (200). The valve core assembly further includes a sliding nut (580). One end of the lead screw (200) away from the rotor assembly (100) is in threaded cooperation with the sliding nut (580). The sliding nut (580) and the stop seat (850) are cooperated through a limiting structure (590), so that the lead screw (200) can drive the sliding nut (580) to drive the valve core assembly to axially move relative to the stop seat (850) along the lead screw (200) to open or close the valve port, and the limiting structure (590) can prevent the sliding nut (580) from rotating around the axis of the lead screw (200) relative to the stop seat (850).

14. An air-conditioning refrigeration system, characterized in that, An electronic expansion valve comprising the electronic expansion valve according to any one of claims 1 to 13.

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