Electronic expansion valve lead screw transmission mechanism and electronic expansion valve assembly

Abstract

The embodiment of the invention provides an electronic expansion valve lead screw transmission mechanism and an electronic expansion valve assembly, and relates to the field of electronic valves, and the electronic expansion valve lead screw transmission mechanism comprises a valve seat, a lead screw body and two positioning pieces. Each positioning piece is provided with a positioning through hole, and the two positioning pieces are installed on the valve seat and arranged in the extension direction of the preset axis; the lead screw body is sequentially arranged in the two positioning through holes in a penetrating mode, and the lead screw body is movably connected with each positioning through hole. The lead screw body is used for being connected with the valve element so as to drive the valve element to ascend and descend relative to the valve seat when the lead screw body moves relative to the positioning piece. By means of the structural design of the lead screw transmission mechanism, the movement stability of the lead screw can be improved, noise is reduced, the abrasion speed is reduced, the failure rate is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The invention relates to the field of electronic valves, and in particular to an electronic expansion valve screw transmission mechanism and an electronic expansion valve assembly. Background Art

[0002] The electronic expansion valve can respond quickly to the dynamic changes of the air-conditioning refrigerant under driving conditions, and can be used in various control strategies to improve the efficiency and performance of the overall air-conditioning system. When the existing electronic valve is in operation, the internal coil is energized to generate a magnetic field, and the magnet rotates, which drives the connecting plate, the stop rod, and the slip ring to move together. The slip ring is installed on the spring guide rail, and the slip ring rotates on the spring guide rail. The spring guide rail has an upper limit and a lower limit. When the slip ring moves to the upper or lower end of the spring guide rail, the upper limit and the lower limit of the spring guide rail prevent the slip ring from continuing to move, and the slip ring stops moving. The protrusion on the slip ring then limits the movement of the stop rod, and the stop rod is stuck with the connecting plate, and the magnet stops moving. At the same time, the rotation of the magnet drives the connecting plate and the screw rod to rotate, and the rotation of the screw rod is converted into the up and down movement of the screw rod through the threaded cooperation with the nut, thereby driving the valve needle to move up and down, and controlling the size of the flow area of ​​the valve port.

[0003] The inventors found in their research that the screw drive mechanism of the electronic expansion valve in the prior art has at least the following disadvantages:

[0004] The screw rod and the plastic nut are threaded together. The processing precision of the plastic nut is low and the tolerance is large, resulting in a large fitting gap between the screw rod and the plastic nut. When the screw rod moves relative to the plastic nut, there is a lot of shaking and noise. At the same time, due to the shaking of the screw rod, the wear speed between the screw rod and the plastic nut is accelerated, the shaking is aggravated, the failure rate is high, and the service life is short. Summary of the invention

[0005] The objects of the present invention include, for example, providing an electronic expansion valve screw drive mechanism and an electronic expansion valve assembly, which can improve the stability of screw movement, reduce noise, reduce wear speed, reduce failure rate, and extend service life.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] In a first aspect, the present invention provides an electronic expansion valve screw transmission mechanism, comprising:

[0008] A valve seat, a screw body and two positioning members, each of which is provided with a positioning through hole, and the two positioning members are both mounted on the valve seat and arranged in the extension direction of the preset axis; the screw body is sequentially inserted into the two positioning through holes, and the screw body is movably connected to each of the positioning through holes;

[0009] The screw rod body is used to be connected to the valve core, so as to drive the valve core to rise and fall relative to the valve seat when the screw rod body moves relative to the positioning member.

[0010] In an optional embodiment, the screw rod body includes a connected smooth rod segment and a threaded rod segment, the smooth rod segment is inserted into the positioning through hole and movably connected to the positioning through hole; the threaded rod segment is used for threaded connection with the valve core.

[0011] Based on the above solution, part of the screw body is processed with external threads, which reduces the processing difficulty of the screw body and reduces the processing cost. The threaded rod section is threadedly connected with the valve core. When the threaded rod section rotates, the valve core and the valve seat cannot rotate relative to each other, so that the valve core can reciprocate in the axial direction of the threaded rod section.

[0012] In an optional embodiment, the electronic expansion valve screw transmission mechanism further includes an elastic member;

[0013] A limiting protrusion is provided on the screw rod body, and the limiting protrusion is located between the two positioning members; the elastic member is provided between the limiting protrusion and the first positioning member of the two positioning members, and the elastic member is used to make the limiting protrusion have a tendency to approach the second positioning member of the two positioning members, and the limiting protrusion is used to contact with the second positioning member to prevent the limiting protrusion from entering the positioning through hole of the second positioning member.

[0014] Based on the above scheme, in the initial state, the valve core is in a position to open the flow channel on the valve needle assembly, and the elastic member is in a compressed state, and the elastic force of the elastic member causes the limiting protrusion to abut against the second positioning member arranged near the valve core, that is, the screw body cannot rise under the elastic force. When the screw body rotates in the first direction under the driving force, since the freedom of relative rotation of the valve core and the valve seat is limited, under the screw connection of the screw body and the valve core, the valve core can only move downward along the extension direction of the preset axis of the valve seat (that is, the axial direction of the screw body) to close the flow channel. When the valve core moves to the position closing the flow channel and contacting the valve port assembly, the screw rod body continues to rotate in the first direction. Since the valve core cannot continue to move downward, the screw rod body rotates upward and away from the valve core, and the limiting protrusion rises with the screw rod body and leaves the second positioning member. At this time, the elastic force of the elastic member can be transmitted to the screw rod body through the limiting protrusion, and then transmitted to the valve core through the screw rod body, so that the valve core is pressed against the valve port assembly by the elastic force of the elastic member. The problem of poor rigid sealing effect caused by manufacturing tolerance and assembly tolerance can be compensated by the elastic force of the elastic member, which can effectively improve the sealing effect.

[0015] In an optional embodiment, the limiting protrusion is configured as an annular structure surrounding the screw rod body.

[0016] Based on the above scheme, the limiting protrusion has high structural strength, is not easy to be damaged, and has good limiting effect. The limiting protrusion has limiting effect all around, and the limiting protrusion can abut against the positioning member during the rotation of the screw body to achieve limiting, and the operation is stable and reliable.

[0017] In an optional embodiment, the positioning member is configured as a bearing, the outer ring of the bearing is mounted on the valve seat, and the area enclosed by the inner ring of the bearing is the positioning through hole; the end of the elastic member away from the limiting protrusion abuts against the inner ring of the positioning member.

[0018] Based on the above scheme, the elastic member is in a compressed state and is clamped between the inner ring of the first positioning member and the limiting protrusion, one end of the elastic member abuts against the inner ring of the first positioning member, and the other end of the elastic member abuts the limiting protrusion against the inner ring of the second positioning member. The torque generated when the screw body rotates will be transmitted to the inner ring of the first positioning member and the inner ring of the second positioning member, thereby driving the inner ring to rotate, making it difficult for the elastic member to rotate relative to the inner ring of the first positioning member, and also making it difficult for the limiting protrusion to rotate relative to the inner ring of the second positioning member, reducing multiple friction pairs, reducing the noise generated by friction, and also reducing the wear rate, extending the service life of the mechanism.

[0019] In an optional embodiment, the screw rod body and the positioning through hole are arranged to be clearance-fitted.

[0020] Based on the above scheme, the positioning accuracy of the screw rod body and the positioning through hole is improved under the premise of ensuring relative movement, and the screw rod body has little shaking and stable operation when moving.

[0021] In an optional embodiment, the gap between the screw rod body and the positioning through hole is set between 0.003mm-0.02mm.

[0022] Based on the above scheme, the screw body and the positioning through hole have high matching accuracy, and the screw body operates stably and reliably.

[0023] In an optional embodiment, the positioning member is made of a wear-resistant material.

[0024] Based on the above scheme, the screw body moves relative to the positioning part, and there is a certain friction between the two. By making the positioning part of wear-resistant material, the wear resistance of the positioning part is improved, the wear amount is reduced, and the wear speed is slow, which can provide long-term and stable support for the screw body and extend the service life of the mechanism.

[0025] In a second aspect, the present invention provides an electronic expansion valve assembly, the electronic expansion valve assembly comprising:

[0026] A driving mechanism, a valve port assembly and an electronic expansion valve screw transmission mechanism as described in any of the aforementioned embodiments; the driving mechanism is connected to the screw body and is used to drive the screw body to move relative to the valve seat; the valve port assembly is installed on the valve seat, the valve core cooperates with the valve port assembly, and the valve core is used to adjust the flow of the valve port assembly when moving relative to the valve seat.

[0027] In an optional embodiment, the valve port assembly includes an upper valve port, a lower valve port and a sealing ring; a flow channel is provided on the upper valve port, and the upper valve port is installed on the valve seat; the lower valve port is installed on the upper valve port, and the sealing ring is installed on the lower valve port, and the sealing ring is used to seal and cooperate with the valve core when the valve core blocks the flow channel.

[0028] Based on the above solution, the valve port assembly has a simple structure and is easy to process and manufacture.

[0029] The beneficial effects of the embodiments of the present invention include, for example:

[0030] To sum up, the electronic expansion valve screw transmission mechanism provided in this embodiment positions the screw body by setting two positioning members, the two positioning members are arranged in the extension direction of the preset axis, the screw body is simultaneously inserted into the positioning through holes of the two positioning members, and the screw body is guided and positioned by the two positioning members at the same time. The screw body shakes little when moving, and the screw body moves smoothly, and it is not easy to cause the magnetic rotor assembly connected to the screw body to tilt, thereby reducing the probability of the magnetic rotor assembly contacting the inner wall of the outer cylinder mounted on the valve seat, thereby reducing the noise generated by friction, and the operation of the electronic valve assembly is more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 is a cross-sectional schematic diagram of an electronic expansion valve assembly according to an embodiment of the present application;

[0033] Figure 2 A schematic cross-sectional view of a valve seat according to an embodiment of the present application;

[0034] Figure 3 A schematic diagram of a screw rod body according to an embodiment of the present application;

[0035] Figure 4 A schematic diagram of a valve port assembly according to an embodiment of the present application;

[0036] Figure 5 Schematic diagram of the position change of the valve core in an embodiment of the present application.

[0037] icon:

[0038] 001-preset axis; 100-valve seat; 110-first end face; 120-second end face; 130-first through hole; 140-second through hole; 200-screw body; 210-smooth rod section; 220-threaded rod section; 230-limiting protrusion; 300-positioning member; 301-positioning through hole; 310-first positioning member; 320-second positioning member; 400-elastic member; 500-driving mechanism; 510-magnetic rotor assembly; 520-connecting plate; 600-valve core; 700-valve port assembly; 710-upper valve port; 711-flow channel; 720-lower valve port; 730-sealing ring. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0044] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0045] In the prior art, the electronic expansion valve includes a screw, a nut, a magnetic rotor assembly 510, a valve seat 100, a valve core 600 and an outer tube, etc. The screw is connected to the magnetic rotor assembly 510, the nut is fixed on the valve seat 100, and the outer tube is fixed on the valve seat 100 and covered with the nut. The screw and the nut are threaded together, and the screw is connected to the valve core 600 in a transmission manner. After the magnetic rotor assembly 510 is energized, it can drive the screw to rotate. Since the nut is fixed, the screw can move up and down with the magnetic rotor assembly 510 when the screw rotates, thereby driving the valve core 600 to move up and down through the screw to achieve flow regulation. Since the nut is generally an injection molded part, the processing accuracy of the nut is low and the wear resistance is poor. When the screw moves relative to the nut, the screw shakes greatly, which is easy to drive the magnetic rotor assembly 510 to tilt, and the magnetic rotor assembly 510 is easy to contact and rub with the outer tube, generating noise. In addition, the tilt of the magnetic rotor assembly 510 aggravates the wear between the screw and the nut, shortening the service life of the electronic expansion valve.

[0046] In view of this, the designer provides an electronic expansion valve screw transmission mechanism, which can improve the stability of the movement of the screw body 200, reduce shaking, reduce wear, reduce noise, and extend service life.

[0047] Please refer to Figure 1 The present embodiment provides an electronic expansion valve screw transmission mechanism, including a valve seat 100, a screw body 200 and two positioning members 300. Each positioning member 300 is provided with a positioning through hole 301, and the two positioning members 300 are both installed on the valve seat 100 and arranged in the extension direction of the preset axis 001; the screw body 200 is sequentially inserted into the two positioning through holes 301, and the screw body 200 is movably connected to each positioning through hole 301. The screw body 200 is used to connect with the valve core 600, so as to drive the valve core 600 to rise and fall relative to the valve seat 100 when the screw body 200 moves relative to the positioning member 300.

[0048] As in the above scheme, the working mode of the electronic expansion valve screw transmission mechanism of this embodiment is as follows:

[0049] The screw body 200 rotates under the drive of the magnetic rotor assembly 510, and the screw body 200 is connected with the valve core 600 in a transmission manner, and can convert the movement of the screw body 200 into the reciprocating movement of the valve core 600 along the extension direction of the preset axis 001, and the flow channel 711 is opened or closed by the valve core 600 to achieve the flow regulation of the flow channel 711. It should be understood that the screw body 200 is simultaneously penetrated in the positioning through holes 301 of the two positioning members 300, and is guided and positioned by the two positioning members 300. When the screw body 200 moves, the screw body 200 shakes less, and the screw body 200 moves smoothly. It is not easy to drive the magnetic rotor assembly 510 connected to the screw body 200 to tilt, which reduces the probability of the magnetic rotor assembly 510 contacting the inner wall of the outer cylinder installed on the valve seat 100, thereby reducing the noise generated by friction, and the operation of the electronic valve assembly is more stable and reliable.

[0050] It should be understood that in other embodiments, the number of the positioning members 300 is not limited to two, but may be greater than two.

[0051] The following embodiments illustrate the details and working principle of the electronic expansion valve screw transmission mechanism of the present application.

[0052] Please refer to Figure 1 and Figure 5 In this embodiment, optionally, the electronic expansion valve screw transmission mechanism includes a valve seat 100, a screw body 200, a first positioning member 310, a second positioning member 320 and an elastic member 400. The first positioning member 310 and the second positioning member 320 are both installed in the valve seat 100 and arranged at intervals in the extension direction of the preset axis 001. The screw body 200 penetrates the valve seat 100 and cooperates with the first positioning member 310 and the second positioning member 320 at the same time. The screw body 200 can rotate and move axially relative to the first positioning member 310 and the second positioning member 320; the elastic member 400 is installed between the first positioning member 310 and the second positioning member 320 and is in a compressed state. Wherein, unless otherwise specified, the preset axis 001 is colinear with the axis of the screw body.

[0053] Please refer to Figure 2 Optionally, the valve seat 100 has a first end face 110 and a second end face 120 that are arranged opposite to each other in the extending direction of the preset axis 001, and the valve seat 100 is provided with a first through hole 130 and a second through hole 140 that are coaxial and connected, the end of the first through hole 130 extends to the first end face 110, and the end of the second through hole 140 extends to the second end face 120; the axes of the first through hole 130 and the second through hole 140 are colinear with the preset axis 001. The first through hole 130 and the second through hole 140 can both be set as cylindrical holes, and the diameter of the first through hole 130 is smaller than the diameter of the second through hole 140, so as to form a step at the connection between the first through hole 130 and the second through hole 140.

[0054] Please refer to Figure 5 Optionally, the first positioning member 310 and the second positioning member 320 can both be configured as bearings, and the first positioning member 310 and the second positioning member 320 can both be made of wear-resistant materials, for example, the first positioning member 310 and the second positioning member 320 can both be made of metal materials. In other words, the first positioning member 310 and the second positioning member 320 can both be configured as metal parts. In this way, the first positioning member 310 and the second positioning member 320 have high processing accuracy, high wear resistance, and long service life. During assembly, the outer ring of the first positioning member 310 is embedded in the first through hole 130, and the outer ring of the first positioning member 310 is interference fit with the hole wall of the first through hole 130. The outer ring of the second positioning member 320 is embedded in the first through hole 130, and the outer ring of the second positioning member 320 is interference fit with the hole wall of the first through hole 130, and the second positioning member 320 is arranged closer to the second end face 120 than the first positioning member 310, that is, in the extension direction of the preset axis 001, the first end face 110, the first positioning member 310, the second positioning member 320 and the second end face 120 are arranged in sequence. At the same time, the first positioning member 310 and the second positioning member 320 have a spacing in the extension direction of the preset axis 001, and the two are arranged at intervals, which can improve the guiding and positioning effects, and can provide installation space for the elastic member 400. The inner ring of the first positioning member 310 and the inner ring of the second positioning member 320 are coaxially arranged, and the through hole surrounded by each inner ring is the positioning through hole 301.

[0055] It should be noted that, in some embodiments, one of the first positioning member 310 and the second positioning member 320 can also be set as a bearing, for example, the first positioning member 310 is set as a metal ring, and the second positioning member 320 is set as a bearing. Alternatively, in some embodiments, both the first positioning member 310 and the second positioning member 320 can be set as metal rings. It can be set as needed. By setting the positioning member 300 as a metal ring, the processing accuracy can also be improved, the processing tolerance of the positioning through hole 301 can be reduced, and the matching accuracy between the screw body 200 and the positioning through hole 301 can be improved.

[0056] In addition, the gap between the screw body 200 and the positioning through hole 301 can be set between 0.003 mm and 0.02 mm. For example, the gap between the screw body 200 and the positioning through hole 301 can be set to 0.003 mm, 0.0115 mm or 0.02 mm.

[0057] Please refer to Figure 3In this embodiment, optionally, the screw body 200 includes a smooth rod segment 210 and a threaded rod segment 220 that are connected and coaxially arranged. The smooth rod segment 210 and the threaded rod segment 220 can be set as an integrated structure, which is easy to process and manufacture, with high processing accuracy, high strength, and long service life. The smooth rod segment 210 and the threaded rod segment 220 can both be cylindrical rods, the outer peripheral surface of the smooth rod segment 210 is a smooth cylindrical surface, and the outer peripheral surface of the threaded rod segment 220 is processed with a thread groove. By processing the external thread on part of the outer peripheral surface of the screw body 200, the processing difficulty is reduced. During assembly, the smooth rod segment 210 cooperates with the positioning through hole 301, which can improve the matching accuracy and improve the stability and reliability of the screw body 200 during movement.

[0058] At the same time, the outer circumferential surface of the smooth rod segment 210 is convexly provided with a limiting protrusion 230, and the limiting protrusion 230 can be set as an annular structure around the axis of the smooth rod segment 210. That is, the limiting protrusion 230 can also be set as an annular protrusion, and the axis of the limiting protrusion 230 is colinear with the axis of the smooth rod segment 210. Further, the limiting protrusion 230 can be integrally formed with the smooth rod segment 210, which is convenient for processing and manufacturing. In this embodiment, the limiting protrusion 230 is a circular ring structure. During assembly, the smooth rod segment 210 is simultaneously inserted into the positioning holes 301 of the first positioning member 310 and the second positioning member 320, the limiting protrusion 230 is located between the first positioning member 310 and the second positioning member 320, and the outer diameter of the limiting protrusion 230 is larger than the diameter of the positioning hole 301, and the outer diameter of the limiting protrusion 230 is smaller than the inner diameter of the outer ring, so that when the screw body 200 moves from the first end face 110 to the second end face 120 toward the second positioning member 320, the limiting protrusion 230 can contact the end face of the inner ring of the second positioning member 320, but will not contact the outer ring of the second positioning member 320, and the limiting protrusion 230 will not enter the positioning hole 301, and the limiting protrusion 230 is used to limit the screw body 200 from escaping from the second positioning member 320. Furthermore, when the limiting protrusion 230 contacts the inner ring of the second positioning member 320 , there is a distance between the limiting protrusion 230 and the first positioning member 310 , thereby providing space for the installation of the elastic member 400 .

[0059] In this embodiment, the elastic member 400 can be optionally configured as a spring. The elastic member 400 is sleeved outside the smooth rod section 210, one end of the elastic member 400 contacts the inner ring of the first positioning member 310, and the other end of the elastic member 400 contacts the limiting protrusion 230. The elastic member 400 is in a compressed state, and the elastic member 400 has a tendency to move the limiting protrusion 230 close to the inner ring of the second positioning member 320, that is, the elastic member 400 can provide resistance to prevent the screw body 200 from moving from the second end face 120 to the first end face 110.

[0060] The assembly method of the electronic expansion valve screw transmission mechanism provided in this embodiment includes, for example:

[0061] Please refer to Figure 1 , first install the first positioning member 310 in the first through hole 130, then sleeve the elastic member 400 on the outside of the screw body 200, and insert the end of the smooth rod section 210 of the screw body 200 into the first through hole 130 from the second through hole 140 and pass through the inner ring of the first positioning member 310. Then, sleeve the inner ring of the second positioning member 320 on the screw body 200 from one end of the threaded rod section 220 of the screw body 200, and embed the outer ring of the second positioning member 320 into the first through hole 130. The distance between the first positioning member 310 and the second positioning member 320 is set according to the requirements and is not specifically limited in this embodiment. After the installation is completed, the elastic member 400 is clamped between the inner ring of the first positioning member 310 and the limiting protrusion 230, and under the action of the elastic member 400, the limiting protrusion 230 abuts against the end face of the inner ring of the second positioning member 320. The threaded rod section 220 of the screw body 200 extends into the second through hole 140, and can be threadedly engaged with the valve core 600 located in the second through hole 140. The valve core 600 and the second through hole 140 are relatively fixed in the circumferential direction of the second through hole 140, and the valve core 600 and the second through hole 140 are slidably engaged in the axial direction of the second through hole 140, so that the valve core 600 will not rotate relative to the valve seat 100, and the valve core 600 can slide relative to the valve seat 100.

[0062] It should be noted that, since one end of the elastic member 400 abuts against the inner ring of the first positioning member 310, and the other end abuts the limiting protrusion 230 against the inner ring of the second positioning member 320, the torque generated when the screw body 200 rotates will be transmitted to the inner ring of the first positioning member 310 and the inner ring of the second positioning member 320, so that the elastic member 400 and the two inner rings rotate together with the screw body 200, the elastic member 400 is not easy to rotate relative to the inner ring of the first positioning member 310, the limiting protrusion 230 is not easy to rotate relative to the inner ring of the second positioning member 320, and the elastic member 400 is not easy to rotate relative to the screw body 200, which reduces multiple friction pairs, reduces the noise generated by friction, reduces the wear rate, and extends the service life of the mechanism.

[0063] The electronic expansion valve screw transmission mechanism provided in this embodiment has a screw body 200 that is guided and positioned by two positioning members 300 at the same time. The screw body 200 has little shaking when moving, and moves smoothly, which does not easily cause the magnetic rotor assembly 510 connected to the screw body 200 to tilt, thereby reducing the probability of the magnetic rotor assembly 510 contacting the inner wall of the outer cylinder mounted on the valve seat 100, thereby reducing the noise generated by friction, and the operation of the electronic valve assembly is more stable and reliable.

[0064] Please refer to Figure 1This embodiment also provides an electronic expansion valve assembly, which includes a driving mechanism 500, a valve core 600, a valve port assembly 700 and the electronic expansion valve screw transmission mechanism of the above embodiment. The driving mechanism 500 is connected to the screw body 200, and is used to drive the screw body 200 to move relative to the valve seat 100. The valve port assembly 700 is installed on the valve seat 100, the valve core 600 is installed in the second through hole 140 of the valve seat 100 and cooperates with the valve port assembly 700, the valve core 600 and the valve seat 100 are relatively fixed in the circumferential direction of the second through hole 140, and the valve core 600 and the valve seat 100 are slidably matched in the axial direction of the second through hole 140. The screw body 200 is threadedly connected to the valve core 600, and the valve core 600 is used to adjust the flow of the valve port assembly 700 when it moves relative to the valve seat 100 under the drive of the screw body 200.

[0065] Optionally, the driving assembly may include a magnetic rotor assembly 510 and a connecting plate 520, the magnetic rotor assembly 510 and the connecting plate 520 are fixedly connected, and the connecting plate 520 is fixed on the smooth rod section 210 of the screw body 200. After the magnetic rotor assembly 510 is powered on, the connecting plate 520 drives the screw body 200 to rotate.

[0066] Please refer to Figure 4 Optionally, the valve port assembly 700 includes an upper valve port 710, a lower valve port 720 and a sealing ring 730. The upper valve port 710 is provided with a flow channel 711, and the upper valve port 710 is mounted on the valve seat 100 and docked with the second through hole 140. The lower valve port 720 is mounted on the upper valve port 710, and the sealing ring 730 is mounted on the lower valve port 720. The sealing ring 730 is used to seal with the end face of the valve core 600 away from the second positioning member 320 when the valve core 600 blocks the flow channel 711.

[0067] In addition, the electronic valve assembly may also include other components that can achieve its basic functions. In order to avoid repeated descriptions, reference may be made to existing known structures, which will not be described in detail in this embodiment.

[0068] The working mode of the electronic expansion valve assembly provided in this embodiment is as follows:

[0069] Please refer to Figure 5, it is set that, in the initial state, the valve core 600 is in a position to open the flow channel 711 on the valve needle assembly, and the elastic member 400 is in a compressed state, and the elastic force of the elastic member 400 causes the limiting protrusion 230 to abut against the second positioning member 320 arranged near the valve core 600, that is, the screw body 200 cannot rise under the elastic force. When the screw body 200 rotates in the first direction under the driving force, since the relative rotation freedom of the valve core 600 and the valve seat 100 is limited, under the screw connection of the screw body 200 and the valve core 600, the valve core 600 can only move downward along the extension direction of the preset axis 001 of the valve seat 100 (that is, the axial direction of the screw body 200) to close the flow channel 711. When the valve core 600 moves to the position of closing the flow channel 711 and contacting the valve port assembly 700, the screw body 200 continues to rotate in the first direction. Since the valve core 600 cannot continue to move downward, the screw body 200 moves upward and away from the valve core 600 while rotating. The limiting protrusion 230 rises with the screw body 200 and leaves the second positioning member 320. At this time, the elastic force of the elastic member 400 can be transmitted to the screw body 200 through the limiting protrusion 230, and then transmitted to the valve core 600 through the screw body 200, so that the valve core 600 is pressed against the valve port assembly 700 by the elastic force of the elastic member 400. The elastic force of the elastic member 400 can compensate for the poor rigid sealing effect caused by manufacturing tolerance and assembly tolerance, and can effectively improve the sealing effect.

[0070] Similarly, when it is necessary to open the flow channel 711, the magnetic rotor assembly 510 drives the screw body 200 to rotate in a second direction opposite to the first direction. The screw body 200 first moves downward a certain distance so that the limit protrusion 230 abuts against the inner ring of the second positioning member 320, and then the screw body 200 continues to rotate in the second direction. Since the screw body 200 has already pressed the limit protrusion 230 against the second positioning member 320 under the action of the elastic member 400, the screw body 200 cannot continue to descend. At this time, the valve core 600 moves upward relative to the screw body 200, thereby opening the flow channel 711.

[0071] In the electronic expansion valve assembly provided in this embodiment, the screw body 200 is positioned and guided simultaneously by two positioning members 300. The screw body 200 has high stability during movement and is not likely to cause the magnetic rotor assembly 510 to deviate. The magnetic rotor assembly 510 is not likely to come into frictional contact with the outer cylinder, and is not likely to generate noise or wear, and has a long service life.

[0072] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An electronic expansion valve screw transmission mechanism, characterized in that: include: A valve seat (100), a screw body (200) and two positioning members (300), each of the positioning members (300) being provided with a positioning through hole (301), the two positioning members (300) being installed on the valve seat (100) and arranged in the extension direction of a preset axis (001); the screw body (200) being sequentially inserted into the two positioning through holes (301), and the screw body (200) being movably connected to each of the positioning through holes (301); The screw rod body (200) is used to be connected to the valve core (600) so as to drive the valve core (600) to rise and fall relative to the valve seat (100) when the screw rod body (200) moves relative to the positioning member (300).

2. The electronic expansion valve screw transmission mechanism according to claim 1, characterized in that: The screw rod body (200) comprises a connected smooth rod section (210) and a threaded rod section (220); the smooth rod section (210) is inserted into the positioning through hole (301) and is movably connected to the positioning through hole (301); and the threaded rod section (220) is used for threaded connection with the valve core (600).

3. The electronic expansion valve screw transmission mechanism according to claim 2, characterized in that: The electronic expansion valve screw transmission mechanism also includes an elastic member (400); A limiting protrusion (230) is provided on the screw rod body (200), and the limiting protrusion (230) is located between the two positioning members (300); the elastic member (400) is provided between the limiting protrusion (230) and the first positioning member (310) of the two positioning members (300), and the elastic member (400) is used to make the limiting protrusion (230) have a tendency to approach the second positioning member (320) of the two positioning members (300), and the limiting protrusion (230) is used to contact the second positioning member (320) to prevent the limiting protrusion (230) from entering the positioning through hole (301) of the second positioning member (320).

4. The electronic expansion valve screw transmission mechanism according to claim 3, characterized in that: The limiting protrusion (230) is configured as an annular structure surrounding the screw rod body (200).

5. The electronic expansion valve screw transmission mechanism according to claim 3, characterized in that: The positioning member (300) is configured as a bearing, the outer ring of the bearing is mounted on the valve seat (100), and the area enclosed by the inner ring of the bearing is the positioning through hole (301); one end of the elastic member (400) away from the limiting protrusion (230) abuts against the inner ring of the positioning member (300).

6. The electronic expansion valve screw transmission mechanism according to any one of claims 1 to 5, characterized in that: The screw rod body (200) and the positioning through hole (301) are arranged to be clearance-fitted.

7. The electronic expansion valve screw transmission mechanism according to claim 6, characterized in that: The gap between the screw rod body (200) and the positioning through hole (301) is set between 0.003 mm and 0.02 mm.

8. The electronic expansion valve screw transmission mechanism according to any one of claims 1 to 5, characterized in that: The positioning member (300) is made of a wear-resistant material.

9. An electronic expansion valve assembly, characterized in that: The electronic expansion valve assembly comprises: A drive mechanism (500), a valve port assembly (700) and an electronic expansion valve screw transmission mechanism as described in any one of claims 1 to 8; the drive mechanism (500) is connected to the screw body (200) and is used to drive the screw body (200) to move relative to the valve seat (100); the valve port assembly (700) is installed on the valve seat (100), the valve core (600) cooperates with the valve port assembly (700), and the valve core (600) is used to adjust the flow of the valve port assembly (700) when moving relative to the valve seat (100).

10. The electronic expansion valve assembly according to claim 9, characterized in that: The valve port assembly (700) includes an upper valve port (710), a lower valve port (720) and a sealing ring (730); a flow channel (711) is provided on the upper valve port (710), and the upper valve port (710) is installed on the valve seat (100); the lower valve port (720) is installed on the upper valve port (710), and the sealing ring (730) is installed on the lower valve port (720), and the sealing ring (730) is used to seal and cooperate with the valve core (600) when the valve core (600) blocks the flow channel (711).

Images