WO2012037739A1

WO2012037739A1 - Electronic expansion valve

Info

Publication number: WO2012037739A1
Application number: PCT/CN2010/078059
Authority: WO
Inventors: 吕铭
Original assignee: 浙江三花股份有限公司
Priority date: 2010-09-20
Filing date: 2010-10-25
Publication date: 2012-03-29
Also published as: KR20120056841A; KR20140046034A; KR101401127B1; WO2012037830A1; CN102410395A; CN102410395B; JP5436686B2; KR101502291B1; JP2013504033A

Abstract

Disclosed is an electronic expansion valve which comprises a casing (1), a magnet (2) and a lead screw (3). The electronic expansion valve further comprises a spindle (4) provided within the casing. A guide rail (5) is provided outside the spindle (4) and cooperates with a sliding ring (6). One of the guide rail (5) and the spindle (4) is coupled with the lead screw (3) and rotates with it, the other is coupled with the casing, and the guide rail is coupled with the lead screw or the casing through a positioning member. The sliding ring (6) is movably coupled with the spindle (4) in the axial direction of the spindle (4) and is fixed around the circumferential direction of the spindle so as to limit the rotation turns of the guide rail (5) or the spindle (4). On the foundation of ensuring the work reliability, the electronic expansion valve can reduce the height of the valve body efficiently.

Description

Electronic expansion valve

The present application claims priority to Chinese Patent Application No. 201010290945.3, entitled "Electronic Expansion Valve", filed on Sep. 20, 2010, the entire disclosure of which is incorporated herein by reference. Technical field

The invention relates to the technical field of fluid control components, and in particular to an electronic expansion valve.

Background technique

The electronic expansion valve for air conditioning is composed of four main parts: stepping motor, threading mechanism, stopper component and valve valve port flow regulating mechanism. The stopper member is composed of a fixing member and a movable member, and the movable member is fixed on the magnet, and the magnet can be circumferentially rotated and axially moved up and down. The fixing member cooperates with the movable member, and its function is to limit the stroke of the thread mechanism and the needle axially lifting, and prevent the thread mechanism and the valve needle from excessively rising or falling, thereby losing the function of the flow adjustment. The electronic expansion valve for air conditioner is generally used in the outdoor unit of the inverter air conditioner. In recent years, some high-grade air conditioners also need to use an electronic expansion valve on the indoor unit. However, due to the narrow space of some models of the indoor unit, it is not conducive to installing a large volume of electronic expansion. Valves, there is no need to improve the electronic expansion valve to make it compact. Please refer to FIG. 1. FIG. 1 is a schematic structural view of an electronic expansion valve in the prior art.

The electronic expansion valve of the prior art comprises a housing 1' in which a magnet 2' is arranged, the magnet 2' is fixedly connected to the screw 3', and rotates circumferentially with the magnet 2', and is screw-fitted. Under the driving, the screw rod 3' moves up and down in the axial direction. As shown in Fig. 1, a valve needle i is connected below the screw rod 3'. As the screw rod 3' moves up and down, the valve needle i adjusts the opening degree of the valve port 2, thereby realizing the vertical tube 8' 1 to the transverse tube 8' 2 The purpose of flow regulation.

As shown in Fig. 1, the slip ring 6' and the guide rail 5' are fitted outside the mandrel 4', and the mandrel 4' is fixed below the end cover 9'1, and the guide rail 5' includes the upper stopper 5'1 and the lower end. The moving portion 5' 2, and the lower stopping portion 5' 2 is riveted and fixed to the mandrel 4'; the stopping rod 9' 2 is fixedly welded to the screw rod 3', and the stopping rod 9' 2 is engaged with the sliding ring 6', The stop lever 9' 2 rotates with the screw y, and the slip ring 6' is rotated by a predetermined number of turns around the guide rail 5' (for example, 5.5 turns); when the slip ring 6' rotates clockwise, it is stopped in the circumferential direction. In the upper stop portion 5' 1 , when the slip ring 6' rotates counterclockwise, the lower stop portion 5' 2 is stopped in the circumferential direction, and the magnet 2' is restricted from rotating by the upper and lower stop positions of the guide rail 5'. Number of turns, which in turn controls the valve needle The lifting stroke of the crucible controls the opening range of the valve port 7' 2 . However, the above structure has the following disadvantages: the magnet 2' and the lead screw must be fixed to the stop rod 9' 2, thereby rotating the slip ring 6' around the guide rail 5'; since the axial length of the stop rod 9' 2 is large, And there is no guide on the upper side, so the shaking of the magnet 2' will cause the stop rod Ψ 2 to sway, in order to prevent the stop rod Ψ 2 from interfering with the guide rail 5', the stop rod 9' 2 and the guide rail 5' need to be set a large gap, so that the stopper member composed of the stopper rod 9' 2, the guide rail 5', the slip ring 6' and the mandrel 4' has a large radial dimension, so that it cannot be integrally or largely loaded into the magnet 2'. In the magnet cavity 2'1, the height of the entire valve body is further large, which is disadvantageous for the purpose of miniaturizing the volume of the electronic expansion valve. Summary of the invention

The technical problem to be solved by the present invention is to provide an electronic expansion valve which can effectively reduce the height of the valve body on the basis of ensuring the operational reliability, thereby realizing the miniaturization of the electronic expansion valve.

In order to solve the above technical problem, the present invention provides an electronic expansion valve including a housing, a magnet is disposed in the housing, and the magnet is connected with a screw rod that rotates therewith; the electronic expansion valve further includes a housing disposed on the housing An inner mandrel, an outer portion of the mandrel is provided with a guide rail, the guide rail is fitted with a slip ring; and one of the guide rail and the mandrel is connected with the screw rod or the magnet and rotates with the same The other is connected to the outer casing, and the guide rails are connected to the screw rod, the magnet or the outer casing through a positioning member; the sliding ring and the mandrel are axially along the mandrel The connection is moved and fixed in the circumferential direction of the mandrel to limit the number of revolutions of the guide rail or the mandrel.

Preferably, the guide rail and the lead screw are connected by the positioning member, and the mandrel is connected to the outer casing.

Preferably, the positioning component is a positioning sleeve, the lower end of the positioning sleeve is sleeved on the outer side of the upper end of the screw rod, and the lower end of the rail is disposed in the inner cavity of the upper end of the positioning sleeve.

Preferably, the lower end portion of the guide rail is provided with a fixing portion, the lower end surface of the positioning sleeve is provided with a positioning card slot, the fixing portion protrudes from the positioning card slot, and the bottom wall of the positioning card slot The fixing portion is sandwiched by an upper end surface of the screw.

Preferably, the upper end portion of the positioning sleeve is further provided with a first stop that cooperates with the slip ring Ministry.

Preferably, the first stopping portion is further disposed at an upper end portion of the positioning sleeve through an inclined portion. Preferably, the guide rail and the outer casing are connected by the positioning member, and the mandrel is coupled to the lead screw.

Preferably, the positioning component is a positioning sleeve, the upper end of the positioning sleeve is connected to the outer casing, and the upper end of the rail is disposed in the inner cavity of the positioning sleeve.

Preferably, the upper end portion of the guide rail is provided with a fixing portion, and the upper end surface of the positioning sleeve is provided with a positioning card slot, the fixing portion protrudes from the positioning card slot, and the bottom wall of the positioning card slot The fixing portion is fitted to the top wall of the outer casing.

Preferably, the lower end portion of the positioning sleeve is further provided with a first stopping portion that cooperates with the sliding ring.

Preferably, the upper end surface of the positioning sleeve is provided with a connecting boss, and the positioning sleeve is connected to the outer casing through the connecting boss.

Preferably, the fixing portion includes a first fixing portion, and a second fixing portion connected to the first fixing portion by a circular arc portion; the positioning card slot includes a first positioning card slot and a second positioning card slot; The first fixing portion protrudes from the first positioning card slot, and surrounds the sidewall of the positioning sleeve through the circular arc portion, and the second fixing portion is inserted into the second positioning card slot in.

Preferably, the mandrel is a sleeve, and a side wall of the sleeve is provided with a groove body; the sliding ring includes a sliding ring body portion and a sliding ring positioning portion at one end of the sliding ring body portion, the sliding The ring positioning portion is disposed in the groove body.

Preferably, the slip ring body portion is disposed inside the sleeve, and the slip ring positioning portion protrudes from the slot body and cooperates with the first stopping portion of the positioning component to limit the The number of turns of the screw.

Preferably, the slip ring body portion is disposed outside the sleeve, the slip ring positioning portion extends into the slot body; and the slip ring further includes a stop at the other end of the slip ring body portion a blocking lever portion, the stopping lever portion is engaged with the first stopping portion of the positioning member to limit the number of rotations of the screw.

Preferably, the sleeve is formed by rolling a quadrangular plate member having a gap between opposite end faces of the plate member, the gap forming the groove body. Preferably, the mandrel is a sleeve, and a side wall of the sleeve is provided with a groove body; the sliding ring includes a sliding ring body portion and a sliding ring positioning portion at one end of the sliding ring body portion, the sliding The ring positioning portion is disposed in the groove body; the upper end surface of the sleeve is provided with a connecting boss, and the sleeve is connected to the outer casing through the connecting boss.

On the basis of the prior art, one of the guide rail and the mandrel of the electronic expansion valve provided by the present invention is connected to the screw or the magnet and rotates with the same, and the other is connected with the outer casing, for example, the guide rail is connected with the screw rod. And rotating along the circumference thereof, the mandrel is connected to the outer casing, and on the basis of the sliding ring and the mandrel are movably connected along the axial direction of the mandrel, and fixed along the circumferential direction of the mandrel, so as to control the screw The number of turns. Specifically, the positioning component may be provided with a first stopping portion, and the upper end portion of the guiding rail may be provided with a second stopping portion, and the sliding ring is within a distance between the first stopping portion and the second stopping portion. The upper and lower sides move in the axial direction to control the number of revolutions of the screw.

It can be seen that, compared with the prior art described above, the structural design guide rail of the present invention is directly connected to the screw rod, and the core shaft is connected with the outer casing (or the core shaft is fixedly connected with the screw rod, and the guide rail is connected with the outer casing), The slip ring does not rotate along the circumferential direction of the mandrel, but moves up and down in a certain range along the axial direction of the mandrel, thereby controlling the number of rotations of the screw rod, thereby eliminating the structure of the prior art stopper rod, by the guide rail, The radial dimension of the retainer member consisting of the slip ring and the mandrel will be significantly reduced, so that the retainer member can be integrated into the magnet cavity of the magnet as a whole or a majority, thereby effectively reducing the height of the valve body, thereby realizing The purpose of miniaturization of the electronic expansion valve.

DRAWINGS

1 is a schematic structural view of an electronic expansion valve in the prior art;

2 is a schematic structural view of an electronic expansion valve when the valve needle is fully opened according to the first embodiment of the present invention; FIG. 3 is a schematic view showing the cooperation of the sliding ring of the electronic expansion valve of FIG. 2 and the first stopping portion of the positioning sleeve; 4 is a schematic structural view of an electronic expansion valve when the valve needle is fully closed in the first embodiment of the present invention; FIG. 5 is a schematic view of the cooperation of the slip ring of the electronic expansion valve of FIG. 4 and the second stop portion of the guide rail; 2 and FIG. 4 is a schematic view showing the assembly of the positioning sleeve and the guide rail of the electronic expansion valve; FIG. 7 is a schematic structural view of the guide rail of the electronic expansion valve of FIGS. 2 and 4.

Figure 8 is a schematic structural view of the positioning sleeve of the electronic expansion valve of Figures 2 and 4;

Figure 9 is a schematic view showing the structure of the electronic expansion valve when the valve needle is fully opened in the second embodiment of the present invention; Figure 10 is a schematic view showing the cooperation of the slip ring of the electronic expansion valve of Figure 9 and the first stop portion of the positioning sleeve Figure

Figure 11 is a schematic view showing the structure of an electronic expansion valve when the valve needle is fully closed in the second embodiment of the present invention;

12 is a schematic view showing the cooperation of the sliding ring of the electronic expansion valve of FIG. 9 and the second stopping portion of the guide rail; FIG. 13 is a schematic structural view of the positioning sleeve of the electronic expansion valve of FIGS. 9 and 11;

Figure 14 is a schematic view showing the assembly of the guide rail and the positioning sleeve of the electronic expansion valve in the third embodiment of the present invention;

Figure 15 is a schematic structural view of a positioning sleeve in a third embodiment of the present invention;

Figure 16 is a schematic structural view of a guide rail according to a third embodiment of the present invention;

Figure 17 is a schematic view showing the assembly of a slip ring, a guide rail and a mandrel of an electronic expansion valve in a fourth embodiment of the present invention;

18 is a schematic structural view of a slip ring according to a fourth embodiment of the present invention;

Figure 19 is a schematic view showing the structure of a mandrel of an electronic expansion valve in the first to fourth embodiments of the present invention.

Wherein, the correspondence between the part name and the reference mark in FIG. 1 is:

Housing 1'; magnet 2'; magnet chamber 2' 1; screw rod 3'; mandrel 4'; guide rail 5'; slip ring 6'; valve needle Π; valve port 7' 2; vertical tube 8' 1; Take over 8' 2; end cap 9' 1; stop rod 9' 2; the correspondence between the part names and reference numerals in Figures 2 to 19 is:

Housing 1; magnet 2; magnet chamber 21; screw rod 3; upper end 31 of the screw;

Mandrel 4; tank 41; connecting boss 42;

The guide rail 5; the fixing portion 51; the first fixing portion 511; the second fixing portion 512; the circular arc portion 513; the second stopping portion 52;

Slip ring 6; slip ring body portion 61; slip ring positioning portion 62; stop bar portion 63;

The positioning sleeve 7; the positioning card slot 71; the first positioning card slot 711; the second positioning card slot 712; the first stopping portion 72; the inclined portion 73; the connecting boss 74;

Valve needle 81; valve port 82; vertical pipe 91; cross pipe 92. detailed description

The core of the present invention is to provide an electronic expansion valve which can effectively reduce the height of the valve body on the basis of ensuring the operational reliability, thereby realizing the miniaturization of the electronic expansion valve. the goal of.

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Please refer to FIG. 2, FIG. 3, FIG. 4 and FIG. 5. FIG. 2 is a schematic structural view of an electronic expansion valve when the valve needle is fully opened according to the first embodiment of the present invention; FIG. 3 is a slip ring of the electronic expansion valve of FIG. FIG. 4 is a schematic view showing the structure of the electronic expansion valve when the valve needle is fully closed according to the first embodiment of the present invention; FIG. 5 is a slip ring of the electronic expansion valve of FIG. A schematic view of the cooperation of the second stop of the guide rail.

In the basic technical solution of the present invention, as shown in FIG. 2 and FIG. 4, the electronic expansion valve includes a casing 1 in which a magnet 2 is disposed, and the magnet 2 is connected with a screw 3 that rotates therewith, and The magnet 2 rotates circumferentially, and under the driving of the screwing, the screw rod 3 moves up and down in the axial direction, and the valve needle 81 is connected below the screw rod 3. When the screw rod 3 moves up and down, the valve needle 81 adjusts the valve port 82. The opening degree, thereby achieving the purpose of adjusting the flow of the fluid from the vertical pipe 91 to the cross pipe 92. Further, as shown in Figs. 2 and 4, the electronic expansion valve further includes a mandrel 4 provided inside the outer casing 1, and a guide rail 5 is provided outside the mandrel 4, and the guide rail is fitted with a slip ring 6.

On the basis of the above prior art, one of the guide rail 5 and the mandrel 4 is connected to the screw 3 or the magnet 2 and rotates therewith, and the other is connected to the outer casing 1, and the guide rail 5 passes through the positioning member and the screw 3. The magnet 2 or the outer casing 1 is connected; the slip ring 6 is movably coupled to the mandrel 4 in the axial direction of the mandrel 4, and is fixed along the circumferential direction of the mandrel 4 so as to limit the number of revolutions of the guide rail 5 or the mandrel 4.

It should be noted that the above basic technical solution does not limit the structure of the positioning component. As long as the positioning component can connect the guide rail 5 to the screw rod 3 or the outer casing 1 and the positioning is reliable, it should be protected by the present invention. Within the scope, such as the positioning sleeve 7 described below; in addition, the above basic technical solution does not limit the position of the slip ring 6, whether the slip ring 6 is located inside the mandrel 4 (refer to FIG. 3 and FIG. 5), The slip ring 6 is located outside the mandrel 4 (refer to Fig. 17) and should be within the scope of the present invention.

As shown in Figs. 2 and 4, in the first embodiment of the present invention, the guide rail 5 and the lead screw 3 are connected by the positioning member, and the mandrel 4 is coupled to the outer casing 1. On the basis of this, the slip ring 6 is movably coupled to the mandrel 4 in the axial direction of the mandrel 4, and is fixed in the circumferential direction of the mandrel 4 to control the number of revolutions of the screw shaft 3. Specifically, the positioning component may be provided with a first stopping portion 72, of the guide rail 5 The upper end portion may be provided with a second stopping portion 52, and the slip ring 6 is moved axially up and down within a distance range between the first stopping portion 72 and the second stopping portion 52, thereby controlling the rotation circle of the screw shaft 3. number.

It can be seen that, compared with the prior art described above, the structural design guide rail 5 of the present invention is directly fixedly connected to the screw rod 3, and the mandrel 4 is connected to the outer casing 1 (or the mandrel 4 is fixedly connected with the screw rod 3, The guide rail 5 is connected to the outer casing 1), the slip ring 6 does not rotate in the circumferential direction of the mandrel 4, but moves up and down in a certain range along the axial direction of the mandrel 4, thereby controlling the number of revolutions of the screw shaft 3, thereby eliminating the need for The structure of the retaining rod in the prior art, so that the radial dimension of the stopper member consisting of the guide rail 5, the slip ring 6 and the mandrel 4 will be significantly reduced, and the stopper member can be integrally or mostly fitted into the magnet 2 In the magnet cavity 21, the height of the valve body is effectively reduced, and the purpose of miniaturizing the volume of the electronic expansion valve is achieved.

Please refer to FIG. 6, FIG. 7 and FIG. 8. FIG. 6 is a schematic view showing the assembly of the positioning sleeve and the guide rail of the electronic expansion valve of FIG. 2 and FIG. 4; FIG. 7 is a schematic structural view of the guide rail of the electronic expansion valve of FIGS. 2 and 4. Figure 8 is a schematic view showing the structure of the positioning sleeve of the electronic expansion valve of Figures 2 and 4.

In the first embodiment described above, the design of the positioning member can be designed. For example, as shown in FIG. 2 and FIG. 4, the positioning component may be a positioning sleeve 7. The lower end of the positioning sleeve 7 is set on the outer side of the upper end of the screw rod 3. The lower end of the guide rail 5 is disposed on the upper end of the positioning sleeve 7. In the inner cavity. Specifically, the upper end portion of the screw shaft 3 may be provided with an annular stepped surface, and the lower end surface of the positioning sleeve 7 is fitted to the annular stepped surface and may be fixed together by laser welding.

As shown in Fig. 7, the upper end portion of the guide rail 5 is provided with a second stopper portion 52, and the lower end portion of the guide rail 5 is provided with a fixing portion 51, and a portion between the second stopper portion 52 and the fixing portion 51 is a spiral track. As shown in FIG. 8, the lower end surface of the positioning sleeve 7 can be provided with a positioning slot 71, and the upper end portion of the positioning sleeve 7 is provided with a first stopping portion 72. On the basis of this, as shown in FIG. 6, the fixing portion 51 protrudes from the positioning card slot 71, and as shown in FIGS. 2 and 4, the bottom wall of the positioning card slot 71 is held by the upper end surface 31 of the screw shaft 3. The fixing portion 51 is such that the guide rail 5 is positioned in the axial direction while the side wall of the positioning card slot 71 restricts the rotation of the guide rail 5 in the circumferential direction.

It should be noted that, without the positioning sleeve 7, the lower end portion of the guide rail 5 can be directly riveted to the upper end portion of the screw rod 3. However, the structural design of the guide rail 5 has a small wire diameter and low strength, so that the contact area of the rivet portion is small. The rivet is easily deformed after receiving the force, so that the coaxiality of the guide rail 5 and the screw rod 3 after riveting is difficult to ensure. In addition, since the magnet cavity 21 of the magnet 2 has a small diameter, and the material of the magnet 2 The material is brittle, and it is easy to damage the magnet 2 during the riveting process. However, in the present invention, the guide rail 5 is fixed to the upper end of the screw shaft 3 by the structural design of the positioning sleeve 7, and solves the problem that the guide rail 5 is directly riveted to the screw shaft 3. Further, as shown in FIG. 8, the first stopper portion 72 is further provided at the upper end portion of the positioning sleeve 7 by the inclined portion 73.

Please refer to FIG. 9, FIG. 10, FIG. 11 and FIG. 12. FIG. 9 is a schematic structural view of an electronic expansion valve when the valve needle is fully opened according to a second embodiment of the present invention; FIG. 10 is a slip ring of the electronic expansion valve of FIG. FIG. 11 is a schematic view showing the structure of the electronic expansion valve when the valve needle is fully closed according to the second embodiment of the present invention; FIG. 12 is a slip ring of the electronic expansion valve of FIG. A schematic view of the cooperation of the second stop of the guide rail.

The technical solution in the second embodiment of the present invention is basically the same as the technical solution in the first embodiment above, except that the guide rail 5 and the outer casing 1 are connected by the positioning member, and the mandrel 4 and the lead screw 3 The connection, that is, the mandrel 4 rotates with the screw 3, and the guide rail 5 is fixed. The technical effects are the same as those of the first embodiment described above, and are not described herein again.

Please refer to FIG. 13, which is a schematic structural view of the positioning sleeve of the electronic expansion valve of FIGS. 9 and 11.

In the second embodiment, as shown in FIG. 13 , the positioning component may also be a positioning sleeve 7 . The upper end of the positioning sleeve 7 is connected to the outer casing 1 , and the upper end of the guide rail 5 is disposed in the inner cavity of the positioning sleeve 7 . . Specifically, the positioning sleeve 7 can be rolled by a plate.

Specifically, as shown in FIG. 13, the upper end surface of the positioning sleeve 7 is provided with a positioning card slot 71. As shown in FIG. 12, the fixing portion 51 protrudes from the positioning card slot 71, and the bottom wall and the outer casing of the positioning card slot 71 are positioned. The top wall of the 1 is fitted with the fixing portion 51 so that the guide rail 5 is positioned in the axial direction, and the side wall of the positioning slot 71 restricts the rotation of the guide rail 5 in the circumferential direction.

Further, in the second embodiment, as shown in FIG. 10 and FIG. 13, the lower end portion of the positioning sleeve 7 is further provided with a first stopping portion 72 that cooperates with the slip ring 6; The end face may be provided with a connecting boss 74. The positioning sleeve 7 is connected to the outer casing 1 through a connecting boss 74. The connecting boss 74 may be specifically fixed to the outer casing 1 by welding. The welding method may specifically be resistance welding.

Please refer to FIG. 14, FIG. 15, and FIG. 16. FIG. 14 is a schematic view showing the assembly of the guide rail and the positioning sleeve of the electronic expansion valve according to the third embodiment of the present invention; FIG. 15 is a third embodiment of the present invention. FIG. 16 is a schematic structural view of a guide rail according to a third embodiment of the present invention.

The third embodiment of the present invention is further improved on the basis of the first embodiment and the second embodiment described above. Specifically, as shown in FIG. 16, the fixing portion 51 includes a first fixing portion 511 and a second fixing portion 512 connected to the first fixing portion 511 through the circular arc portion 513; as shown in FIG. 15, the positioning card slot 71 includes The first positioning card slot 711 and the second positioning card slot 712 can be symmetrically disposed; as shown in FIG. 14 , the first fixing portion 511 protrudes from the first positioning slot 711 and passes through the arc The portion 513 is wound around the side wall of the positioning sleeve 7, and the second fixing portion 512 is inserted into the second positioning card slot 712. The structural design fixes the guide rail 5 by two positioning slots, so that the rail 5 is balanced by force, thereby improving the reliability and stability of the work.

Referring to FIG. 17, FIG. 18 and FIG. 19, FIG. 17 is a schematic view showing the assembly of the slip ring, the guide rail and the mandrel of the electronic expansion valve according to the fourth embodiment of the present invention; FIG. 18 is a sliding ring according to a fourth embodiment of the present invention. FIG. 19 is a schematic structural view of a mandrel of an electronic expansion valve in the first to fourth embodiments of the present invention.

In any of the embodiments of the present invention, the design of the mandrel 4 can be designed. Specifically, as shown in FIG. 19, the mandrel 4 is a sleeve, and the side wall of the sleeve is provided with a groove body 41; further, the sleeve may be formed by a quadrangular plate member, and the plate member is opposite There is a gap between the two end faces, and the gap forms the groove body 41. Of course, the sleeve can also be machined from a steel tube, in which case the groove 41 needs to be machined on the side wall of the steel tube. It should be noted that the groove body may be a straight groove in the same direction as the axial direction of the mandrel, or may be an inclined groove; of course, the end portion of the groove body may be chamfered to install the slip ring described below. Positioning unit 62.

As shown in FIG. 3, FIG. 5, FIG. 10 and FIG. 12, in the first, second and third embodiments of the present invention, the slip ring 6 includes a slip ring body portion 61 and a slip ring positioning portion 62, and a slip ring The main body portion 61 is disposed inside the sleeve, and the slip ring positioning portion 62 protrudes from the groove body 41 and cooperates with the first stopping portion 72 of the positioning member or the second stopping portion 52 of the guide rail 5 to The number of revolutions of the screw 3 is limited. It should be noted that, in the above three embodiments, the slip ring positioning portion 62 functions as a positioning function, that is, cooperates with the groove body 41 of the mandrel 4 to restrict the rotation of the slip ring 6; The action of the shift lever cooperates with the first stop portion 72 of the positioning sleeve 7 or the second stop portion 52 of the guide rail 5 to limit the number of revolutions of the screw rod 3, control the lifting stroke of the valve needle 81, and thereby control The opening range of the valve port 82. As shown in FIG. 17 and FIG. 18, in the fourth embodiment of the present invention, as shown in FIG. 17, the slip ring 6 includes a slip ring main body portion 61, a slip ring positioning portion 62 at the end of the slip ring main body portion 61, and a stop lever portion 63 located at the other end of the slip ring body portion 61; as shown in FIG. 18, the slip ring body portion 61 is fitted to the outside of the sleeve, and the slip ring positioning portion 62 projects into the slot body 41. The shift lever portion 63 cooperates with the first stopper portion 72 of the positioning sleeve 7 or the second stopper portion 52 of the guide rail 5 to limit the number of revolutions of the screw shaft 3. It should be noted that, in this embodiment, the slip ring positioning portion 62 only functions as a positioning, that is, cooperates with the groove body 41 of the mandrel 4 to restrict the rotation of the slip ring 6; in addition, a stop lever portion is separately provided. 63, cooperate with the first stopping portion 72 of the positioning sleeve 7 or the second stopping portion 52 of the guide rail 5 to limit the number of rotations of the screw rod 3, control the lifting stroke of the valve needle 81, and thereby control the opening of the valve opening 82. Degree range.

In addition, in the above-mentioned first embodiment, as shown in FIG. 19, the upper end surface of the mandrel 4 may be provided with a connecting boss 42 through which the mandrel 4 is connected to the top wall of the outer casing 1, and the connecting convex portion The connection between the table 42 and the top wall of the outer casing 1 may specifically be welding.

Finally, the electronic expansion valve provided by the present invention is described in detail above. This document should only be used to help understand the method of the present invention and its core ideas. It should be noted that those skilled in the art can make various modifications and changes to the present invention without departing from the spirit and scope of the invention.

Claims

Rights request

An electronic expansion valve comprising a housing (1), a magnet (2) disposed therein, the magnet (2) being connected with a screw (3) rotating therewith; the electronic expansion valve further comprising a mandrel (4) disposed inside the outer casing, a guide rail (5) is disposed outside the mandrel (4), and the guide rail is matched with a slip ring (6); wherein the guide rail (5) One of the mandrel (4) is connected to the screw (3) or the magnet (2) and rotates therewith, the other is connected to the outer casing (1), and the guide rail ( 5) each connected to the lead screw (3), the magnet (2) or the outer casing (1) by a positioning member; the slip ring (6) and the mandrel (4) along the mandrel The axially movable connection of (4) is fixed along the circumferential direction of the mandrel (4) to limit the number of revolutions of the guide rail (5) or the mandrel (4).

2. The electronic expansion valve according to claim 1, wherein the guide rail (5) and the lead screw (3) are connected by the positioning member, the core shaft (4) and the outer casing ( 1) Connect.

The electronic expansion valve according to claim 2, wherein the positioning member is a positioning sleeve (7), and a lower end portion of the positioning sleeve (7) is fitted to an upper end portion of the screw rod (3) On the outside, the lower end portion of the guide rail (5) is disposed in the inner cavity of the upper end portion of the positioning sleeve (7).

The electronic expansion valve according to claim 3, wherein the lower end portion of the guide rail (5) is provided with a fixing portion (51), and the lower end surface of the positioning sleeve (7) is provided with a positioning card slot ( 71), the fixing portion (51) protrudes from the positioning card slot (71), and a bottom wall of the positioning card slot (71) is sandwiched by an upper end surface (31) of the screw rod (3) Holding the fixing portion (51).

The electronic expansion valve according to claim 3 or 4, wherein the upper end portion of the positioning sleeve (7) is further provided with a first stopping portion (72) that cooperates with the sliding ring (6) .

The electronic expansion valve according to claim 5, wherein the first stopper (72) is further provided at an upper end portion of the positioning sleeve (7) via an inclined portion (73).

7. The electronic expansion valve according to claim 1, wherein the guide rail (5) and the outer casing (1) are connected by the positioning member, the mandrel (4) and the screw ( 3) Connect.

The electronic expansion valve according to claim 7, wherein the positioning member is a positioning sleeve (7), and an upper end portion of the positioning sleeve (7) is connected to the outer casing (1), the guide rail The upper end portion of (5) is disposed in the inner cavity of the positioning sleeve (7).

The electronic expansion valve according to claim 8, wherein the upper end portion of the guide rail (5) is provided with a fixing portion (51), and the upper end surface of the positioning sleeve (7) is provided with a positioning card slot ( 71), the fixing portion (51) protrudes from the positioning card slot (71), and the bottom wall of the positioning card slot (71) is engaged with the top wall of the outer casing (1) to be fixed Ministry (51).

The electronic expansion valve according to claim 8 or 9, wherein the lower end portion of the positioning sleeve (7) is further provided with a first stopping portion (72) that cooperates with the sliding ring (6) .

The electronic expansion valve according to any one of claims 8 or 9, wherein the upper end surface of the positioning sleeve (7) is provided with a connecting boss (74), and the positioning sleeve (7) passes through The connecting boss (74) is connected to the outer casing (1).

The electronic expansion valve according to claim 4 or 9, wherein the fixing portion (51) includes a first fixing portion (511), and the first fixing portion (511) passes through the circular portion

(513) a second fixing portion (512) connected; the positioning card slot (71) includes a first positioning card slot (711) and a second positioning card slot (712); the first fixing portion (511) Extending in the first positioning card slot (711), and surrounding the side wall of the positioning sleeve (7) through the circular arc portion (513), and the second fixing portion (512) is inserted into the The second positioning card slot (712).

The electronic expansion valve according to claim 1, 2, 3, 4, 7, 8, or 9, wherein the mandrel (4) is a sleeve, and a side wall of the sleeve is provided with a groove The slip ring (6) includes a slip ring body portion (61) and a slip ring positioning portion (62) located at one end of the slip ring body portion (61), the slip ring positioning portion (62) It is disposed in the tank body (41).

The electronic expansion valve according to claim 13, wherein the slip ring body portion (61) is provided inside the sleeve, and the slip ring positioning portion (62) is from the groove body ( 41) extends and cooperates with the first stopping portion (52) of the positioning member to limit the number of rotations of the screw (3).

The electronic expansion valve according to claim 13, wherein the slip ring body portion (61) is fitted to the outside of the sleeve, and the slip ring positioning portion (62) extends into the slot body. (41); the slip ring (6) further includes a stopper bar portion (63) at the other end of the slip ring body portion (61), the stopper bar portion (63) and the positioning The first stop (72) of the component cooperates to limit the number of turns of the lead screw (3).

The electronic expansion valve according to claim 13, wherein the sleeve is formed by a quadrangular plate member, and a gap is formed between opposite end faces of the plate member, the gap forming the groove Body (41).

The electronic expansion valve according to any one of claims 2 to 4, wherein the mandrel (4) is a sleeve, and a side wall of the sleeve is provided with a groove body (41); 6) comprising a slip ring body portion (61) and a slip ring positioning portion (62) at one end of the slip ring body portion (61), wherein the slip ring positioning portion (62) is disposed in the slot body (41) The upper end surface of the sleeve is provided with a connecting boss (42), and the sleeve is connected to the outer casing (1) through the connecting boss (42).