Stop device and electronic expansion valve

Abstract

The utility model belongs to the technical field of fluid control valves, and particularly relates to a stop device and an electronic expansion valve. Which comprises a spring guide rail provided with an upper stop part and a lower stop part and a nut used for installing the spring guide rail, and is characterized in that the nut is provided with a limiting hole parallel to the axis of the nut, the limiting hole is provided with a continuous hole wall, and the lower stop part of the spring guide rail is provided with an insertion section inserted into the limiting hole. Therefore, the limiting hole which is parallel to the axis of the nut and provided with the continuous hole wall is formed in the nut, the insertion section of the lower stop part of the spring guide rail is inserted into the limiting hole, the limiting hole stops the insertion section of the spring guide rail, and the spring guide rail is prevented from being disengaged from the nut in the radial direction.

Description

Technical Field

[0001] The utility model belongs to the technical field of fluid control valves, and in particular relates to a stop device and an electronic expansion valve. Background Art

[0002] The electronic expansion valve is installed between the condenser and the evaporator as the dividing point between the high pressure and low pressure of the air conditioning refrigeration system. Its function is to throttle and reduce the pressure of the high-pressure liquid refrigerant from the condenser, and to adjust and control the amount of liquid refrigerant entering the evaporator to adapt to the changes in the refrigeration load. The driving method of the electronic expansion valve is that the controller calculates the parameters collected by the sensor, sends an adjustment instruction to the drive board, and the drive board outputs an electrical signal to the electronic expansion valve, and then drives the electronic expansion valve rotor assembly through the coil to control the forward and reverse rotation of the rotor. Through the valve stem and nut transmission, the rotor spiral motion is converted into linear displacement to realize the up and down movement of the valve needle, and the throttling area of ​​the electronic expansion valve valve port is adjusted, thereby realizing the control of the refrigerant amount. The electronic expansion valve is superior to the traditional throttling mechanism in superheat control (liquid level control) and flow regulation, and has a faster response speed, a wider adjustment range, and a significant energy-saving effect. Obviously, in order to ensure that the upper and lower displacements of the valve needle are carried out within the set range, stop devices at the upper and lower limit positions should be set.

[0003] The Chinese invention patent application with application publication number CN103375624A discloses an electric valve and its stop device, wherein the stop device comprises a spring guide rail and a slip ring which are nested and spirally matched inside and outside, the spring guide rail has an upper stopper and a lower stopper, and also comprises a nut matched with the electric valve screw rod, the nut has a step surface; the nut below the step surface has a clamping limiter (notch); the spring guide rail is sleeved on the nut above the step surface, and also comprises a first limiter and a second limiter; the clamping limiter on the nut specifically comprises a first clamping limiter and a second clamping limiter. In this scheme, the tail end of the spring guide rail is clamped into the notch on the nut or the notch on the insert. This assembly form may result in the spring guide rail being loosely connected to the nut, and there is a risk of the ejection guide rail being radially disengaged and falling off; and because there are multiple eccentric bends at the lower end of the spring guide rail, the structure is complex, the spring guide rail is not easy to process, and the dimensional tolerance is large, which may cause the spring guide rail to move up and down, affecting the adjustment accuracy. Utility Model Content

[0004] The purpose of the utility model is to provide a stopper device to solve the risk of falling off caused by the loose connection between the spring guide rail and the nut in the current stopper device. The purpose of the utility model is also to provide an electronic expansion valve to solve the same problem as above.

[0005] In order to achieve the above purpose, the stopper device in the utility model adopts the following technical solution:

[0006] A stopping device comprises a spring guide rail having an upper stopping portion and a lower stopping portion and a nut for mounting the spring guide rail, wherein the nut is provided with a limiting hole parallel to the axis of the nut, the limiting hole has a continuous hole wall, and the lower stopping portion of the spring guide rail has an insertion section inserted into the limiting hole.

[0007] The beneficial effect of the above technical solution is that: the utility model improves the existing technology, and a limiting hole with a continuous hole wall parallel to the axis of the nut is set on the nut, and the insertion section of the lower stopper of the spring guide rail is inserted into the limiting hole. In this way, the limiting hole forms a stop for the insertion section of the spring guide rail, thereby preventing the spring guide rail from radially escaping from the nut.

[0008] Furthermore, the insertion section and the limiting hole are fixed by welding.

[0009] The beneficial effect of the above technical solution is that: such a setting fixes the insertion section of the spring guide rail and the limiting hole by welding, realizes axial and circumferential limiting of the spring guide rail relative to the nut, avoids radial disengagement of the spring guide rail, and improves the stability of the spring guide rail.

[0010] Furthermore, the nut includes a step portion, the step portion has a radially extending first step surface for supporting the spring guide rail and a second step surface for fixedly connecting with the valve seat of the electronic expansion valve, and the limiting hole is arranged on the second step surface.

[0011] The beneficial effect of the above technical solution is that the limiting hole is directly provided on the nut, which simplifies the structure of the nut, reduces the assembly process, and makes it easier to ensure the assembly consistency of the relative position of the spring guide rail.

[0012] Furthermore, an annular metal connector for fixed connection with a valve seat of the electronic expansion valve is integrally embedded on the outer peripheral surface of the nut by injection molding, and the limiting hole is arranged on the annular metal connector.

[0013] The beneficial effect of the above technical solution is that the limiting hole is arranged on the annular connecting piece, which is easy to process.

[0014] Furthermore, at least one reinforcement groove is provided on the circumference of the inner hole of the annular metal connector.

[0015] The beneficial effect of the above technical solution is that such a setting facilitates the positioning of the connecting piece relative to the nut when the connecting piece and the nut are processed by injection molding, and at the same time increases the connection strength between the connecting piece and the nut.

[0016] Furthermore, the nut is provided with a balancing hole penetrating through the side wall.

[0017] The beneficial effect of the above technical solution is that such a setting makes it easy to achieve air pressure balance between the inner cavity and the outer cavity of the nut through the balance hole.

[0018] Furthermore, the nut includes a step, on which a plane section is provided for avoiding the insertion section, and the balancing hole is provided on the plane section along the radial direction of the nut.

[0019] The beneficial effect of the above technical solution is that: such a setting, by setting a flat section on the stage to avoid the insertion surface, facilitates the insertion of the insertion section into the limiting hole; the balancing hole set on the flat section is easy to process and also easy to ensure the strength of the nut.

[0020] Furthermore, the stopping device also includes a stopping ring spirally matched with the spring guide rail, and the end faces at both ends of the stopping ring are stop surfaces respectively matched with the upper stop part and the lower stop part, and a protrusion for matching with the rotor stop part of the electronic expansion valve is provided between the two stop surfaces at the middle position of the spiral line of the stopping ring.

[0021] The beneficial effects of the above technical solution are: with such an arrangement, the raised portion cooperating with the rotor stop portion is located in the middle position of the two stop surfaces of the stop ring, and there is no need to distinguish between the upper and lower ends of the stop ring during assembly, thereby improving the assembly efficiency; when the raised portion contacts and cooperates with the rotor stop portion, the force on the stop ring is more uniform, which is beneficial to the noise reduction of the electronic expansion valve, and also improves the stopping accuracy; the end portions of the two ends of the stop ring are set as the positions cooperating with the spring guide rail, so that the contact surface size of the stop ring and the spring guide rail is uniform.

[0022] Furthermore, the stop ring is integrally formed, and the protrusion is a bent portion of the stop ring.

[0023] The beneficial effect of the above technical solution is that: such a setting and the one-piece structure facilitate the processing and manufacturing of the stop ring, while effectively ensuring the overall strength of the stop ring.

[0024] In order to achieve the above purpose, the electronic expansion valve in the utility model adopts the following technical solutions:

[0025] An electronic expansion valve comprises a valve needle and a stop device for controlling the opening and closing stroke of the valve needle, wherein the stop device comprises a spring guide rail having an upper stop portion and a lower stop portion and a nut for mounting the spring guide rail, wherein the nut is provided with a limiting hole parallel to the axis of the nut, the limiting hole has a continuous hole wall, and the lower stop portion of the spring guide rail has an insertion section inserted into the limiting hole.

[0026] The beneficial effect of the above technical solution is that: the utility model improves the existing technology, and a limiting hole with a continuous hole wall parallel to the axis of the nut is set on the nut, and the insertion section of the lower stopper of the spring guide rail is inserted into the limiting hole. In this way, the limiting hole forms a stop for the insertion section of the spring guide rail, thereby preventing the spring guide rail from radially escaping from the nut.

[0027] Furthermore, the insertion section and the limiting hole are fixed by welding.

[0028] The beneficial effect of the above technical solution is that: such a setting fixes the insertion section of the spring guide rail and the limiting hole by welding, realizes axial and circumferential limiting of the spring guide rail relative to the nut, avoids radial disengagement of the spring guide rail, and improves the stability of the spring guide rail.

[0029] Furthermore, the nut includes a step portion, the step portion has a radially extending first step surface for supporting the spring guide rail and a second step surface for fixedly connecting with the valve seat of the electronic expansion valve, and the limiting hole is arranged on the second step surface.

[0030] The beneficial effect of the above technical solution is that the limiting hole is directly provided on the nut, which simplifies the structure of the nut, reduces the assembly process, and makes it easier to ensure the assembly consistency of the relative position of the spring guide rail.

[0031] Furthermore, an annular metal connector for fixed connection with a valve seat of the electronic expansion valve is integrally embedded on the outer peripheral surface of the nut by injection molding, and the limiting hole is arranged on the annular metal connector.

[0032] The beneficial effect of the above technical solution is that the limiting hole is arranged on the annular connecting piece, which is easy to process.

[0033] Furthermore, at least one reinforcement groove is provided on the circumference of the inner hole of the annular metal connector.

[0034] The beneficial effect of the above technical solution is that such a setting facilitates the positioning of the connecting piece relative to the nut when the connecting piece and the nut are processed by injection molding, and at the same time increases the connection strength between the connecting piece and the nut.

[0035] Furthermore, the nut is provided with a balancing hole penetrating through the side wall.

[0036] The beneficial effect of the above technical solution is that such a setting makes it easy to achieve air pressure balance between the inner cavity and the outer cavity of the nut through the balance hole.

[0037] Furthermore, the nut includes a step, on which a plane section is provided for avoiding the insertion section, and the balancing hole is provided on the plane section along the radial direction of the nut.

[0038] The beneficial effect of the above technical solution is that: such a setting, by setting a flat section on the stage to avoid the insertion surface, facilitates the insertion of the insertion section into the limiting hole; the balancing hole set on the flat section is easy to process and also easy to ensure the strength of the nut.

[0039] Furthermore, the stopping device also includes a stopping ring spirally matched with the spring guide rail, and the end faces at both ends of the stopping ring are stop surfaces respectively matched with the upper stop part and the lower stop part, and a protrusion for matching with the rotor stop part of the electronic expansion valve is provided between the two stop surfaces at the middle position of the spiral line of the stopping ring.

[0040] The beneficial effects of the above technical solution are: with such an arrangement, the raised portion cooperating with the rotor stop portion is located in the middle position of the two stop surfaces of the stop ring, and there is no need to distinguish between the upper and lower ends of the stop ring during assembly, thereby improving the assembly efficiency; when the raised portion contacts and cooperates with the rotor stop portion, the force on the stop ring is more uniform, which is beneficial to the noise reduction of the electronic expansion valve, and also improves the stopping accuracy; the end portions of the two ends of the stop ring are set as the positions cooperating with the spring guide rail, so that the contact surface size of the stop ring and the spring guide rail is uniform.

[0041] Furthermore, the stop ring is integrally formed, and the protrusion is a bent portion of the stop ring.

[0042] The beneficial effect of the above technical solution is that: such a setting and the one-piece structure facilitate the processing and manufacturing of the stop ring, while effectively ensuring the overall strength of the stop ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the electronic expansion valve of the utility model;

[0044] Figure 2 for Figure 1 The structural breakdown diagram of

[0045] Figure 3 for Figure 1 A cross-sectional view of

[0046] Figure 4 It is a schematic diagram of the magnetic ring assembly in the utility model;

[0047] Figure 5 It is a schematic diagram of the stopping device of the utility model;

[0048] Figure 6 It is a schematic diagram of the connecting piece in the utility model;

[0049] Figure 7 for Figure 5 Schematic diagram after assembly;

[0050] Figure 8 It is a schematic diagram of the stopper device and the valve seat after being assembled in the utility model;

[0051] Fig. 9 It is a schematic diagram of the assembly of the stopper device of the utility model.

[0052] In the figure: 1. stator assembly; 2. sleeve; 3. magnetic ring assembly; 4. stopper; 5. valve needle assembly; 6. valve seat;

[0053] 31. rotor magnet; 32. rotor connection part; 33. rotor stopper;

[0054] 41. Nut; 42. Stop ring; 43. Spring guide; 44. Connector;

[0055] 51. Valve needle; 52. Valve stem;

[0056] 61, medium inlet and outlet; 62, valve port; 63, valve seat mounting hole; 64, step hole; 621, valve port;

[0057] 411, stage; 412, spring matching section; 413, valve seat matching section; 414, stopper; 415, axial groove; 416, protrusion; 417, balance hole; 418, radial groove; 419, flat section; 4111, first step surface; 4112, second step surface;

[0058] 421, upper stop surface; 422, lower stop surface; 423, raised portion;

[0059] 431, upper stopper; 432, spiral guide; 433, lower stopper; 4331, first limiting section; 4332, second limiting section; 4333, third limiting section;

[0060] 441. Limiting hole; 442. Reinforcement groove; 443. Butt joint. DETAILED DESCRIPTION

[0061] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0062] Embodiment 1 of the electronic expansion valve in the utility model:

[0063] In the prior art, when the stop device of the electronic expansion valve limits the spring guide rail, the tail end of the spring guide rail is often inserted into the notch on the nut or the notch on the insert. This assembly method may result in a loose connection between the spring guide rail and the nut, and there is a risk of the ejection guide rail radially disengaging and falling off. In addition, since there are multiple eccentric bends at the lower end of the spring guide rail and the structure is complex, the spring guide rail is not easy to process and has a large dimensional tolerance, which will cause the spring guide rail to move up and down, affecting the adjustment accuracy.

[0064] Based on the above problems, the utility model provides a stop device to solve the risk of falling off caused by the loose connection between the spring guide rail and the nut in the current stop device. A stop device includes a spring guide rail having an upper stopper and a lower stopper and a nut for mounting the spring guide rail, the nut is provided with a limiting hole parallel to the axis of the nut, the limiting hole has a continuous hole wall, and the lower stopper of the spring guide rail has an insertion section inserted into the limiting hole.

[0065] The utility model provides a limiting hole with a continuous hole wall parallel to the axis of the nut on the nut, and the insertion section of the lower stopper of the spring guide rail is inserted into the limiting hole. In this way, the limiting hole forms a stop for the insertion section of the spring guide rail, thereby preventing the spring guide rail from radially escaping from the nut.

[0066] like Figures 1 to 4 As shown, the electronic expansion valve provided by the utility model is composed of a stator assembly 1 and a rotor assembly. The rotor assembly includes a sleeve 2, a magnetic ring assembly 3, a stopper 4, a valve needle assembly 5 and a valve seat 6. The valve needle assembly 5 is arranged in the valve seat 6, and the upper end of the valve needle assembly 5 passes through the stopper 4 and is connected by a threaded pair. The top end of the valve needle assembly 5 then passes through the magnetic ring assembly 3 and is fixedly connected to the magnetic ring assembly 3. In this embodiment, the valve needle assembly 5 and the magnetic ring assembly 3 are fixedly connected by laser welding. The stopper 4 is arranged in the magnetic ring assembly 3, the magnetic ring assembly 3 is located inside the sleeve 2, and the sleeve 2 is located inside the stator assembly 1. In this embodiment, the stator assembly 1 also includes a shell with an opening at one end, which is mounted on the outside of the rotor assembly and the stator coil.

[0067] According to the electronic expansion valve described above, under the action of the stator coil excitation and energization, the stator coil generates a periodically changing magnetic field, thereby driving the rotor to rotate forward or reversely, and the magnetic ring assembly 3 is fixedly connected to the valve stem 52 of the valve needle assembly 5. When the magnetic ring assembly 3 rotates, it synchronously drives the valve needle assembly 5 to rotate. The valve stem 52 of the valve needle assembly 5 is provided with an external thread, and the inner hole of the nut 41 of the stopper 4 is provided with an internal thread. The valve stem 52 and the nut 41 are threadedly matched. Through the thread side effect between the valve stem 52 and the nut 41, the magnetic ring assembly 3 rotates, and the valve stem 52 rotates and moves up and down along the axial direction, thereby driving the valve needle 51 of the valve needle assembly 5 to open or close the opening of the valve port 62 to adjust the flow rate of the fluid.

[0068] like Figure 3As shown, the valve seat 6 has a valve port 621 and a medium inlet and outlet 61 connected to a medium inlet pipeline and a medium outlet pipeline (not shown in the figure), and the valve port 621 has a valve port 62. By adjusting the opening of the valve port 62, the medium flow between the medium inlet pipeline and the medium outlet pipeline can be controlled. Specifically, the valve seat 6 has an axial valve seat mounting hole 63 that cooperates with the valve needle assembly, and the lower end of the valve seat mounting hole 63 forms the valve port 62. The valve needle assembly 5 can be axially slidable and rotatable in the valve seat mounting hole 63; the end of the valve seat mounting hole 63 of the valve seat 6 that is away from the valve port 62 has a step hole 64 section that cooperates with the stop device 4, and the stop device 4 can be effectively limited by the step hole 64 section. In this embodiment, the valve seat 6 is an integrated structure. In other embodiments, the valve seat 6 can also be a split structure, including a valve seat body 62 and a valve base 61, and the valve base 61 has a valve port 62.

[0069] The “axial direction” mentioned herein refers to the axial direction of the valve seat, and is defined as follows: along the axial direction of the valve seat 6, the end of the stopper 4 and the valve needle assembly 5 close to the valve port 62 is the bottom, and the end away from the valve port 62 is the top.

[0070] like Figure 4 As shown, the magnetic ring assembly 3 includes a rotor magnet 31, a rotor connection part 32, and a rotor stopper 33. Specifically, the rotor connection part 32 and the rotor magnet 31 are integrally formed by injection molding. A stopper connection hole (not shown in the figure) is provided on the rotor connection part 32 for penetrating the rotor stopper 33. The rotor stopper 33 passes through the stopper connection hole and the convex part buckled on the rotor connection part 32, and then is laser welded at the connection between the rotor connection part 32 and the rotor stopper 33 to form a whole. The magnetic ring assembly 3 is fixedly connected to the valve stem 52 of the valve needle assembly 5 through the rotor connection part 32. The magnetic ring assembly 3 drives the valve stem 52 to rotate synchronously under the drive of the stator coil. The rotor stopper 33 is arranged on the inner side of the magnetic ring assembly 3, and the rotor magnet 31 is sleeved on the outer side of the spring guide rail 43. The rotor stopper 33 cooperates with the stop ring 42 and the spring guide rail 43 of the stop device 4 to limit the rotation of the magnetic ring assembly 3 within a specified stroke range.

[0071] In this embodiment, the portion where the rotor stopper 33 cooperates with the raised portion of the rotor connection portion 32 is open, which is convenient for cooperation and installation with the raised portion of the rotor connection portion 32. The rotor stopper 33 also has a bent section to increase its strength. In other embodiments, the rotor stopper 33 and the rotor magnet 31 can be integrally formed.

[0072] like Figures 5 to 8As shown, the stopper 4 is coaxially arranged in the stepped hole 64 section of the valve seat 6, and the stopper 4 comprises a nut 41, a connector 44, a spring guide 43 and a stop ring 42. Specifically, the stopper 4 is fixedly connected to the valve seat 6 at the butt joint 443 by welding through the connector 44, the spring guide 43 is sleeved on the outer peripheral surface of the nut 41, the stop ring 42 is sleeved on the spring guide 43 and spirally matched with the spring guide 43, the stop ring 42 can spirally rotate along the spring guide 43 within the upper and lower limited stroke ranges, and the stop ring 42 and the spring guide 43 cooperate with the magnetic ring assembly 3 to realize the stroke control of the electronic expansion valve from fully open to fully closed.

[0073] The nut 41 is made of injection molding of engineering plastic, and includes an upper spring fitting section 412 for fitting the spring guide rail 43, a valve seat fitting section 413 for connecting to the valve seat 6, and a middle stage 411 connecting the upper spring fitting section 412 and the valve seat fitting section 413. A protrusion 416 and a limit block 414 are also provided on the stage 411. An axial groove 415 extending along the axial direction of the nut 41 and ending at the connecting piece 44, and a radial groove 418 connected to the axial groove 415 are formed between the protrusion 416 and the limit block 414.

[0074] In this embodiment, the step portion 411 has a radially extending first step surface 4111 for supporting the spring guide rail 43 and a second step surface 4112 for fixedly connecting with the valve seat 6 of the electronic expansion valve.

[0075] An annular metal connector 44 for fixed connection with the valve seat 6 of the electronic expansion valve is embedded on the outer peripheral surface of the nut 41 by injection molding. Specifically, the connector 44 is embedded on the stage 411 and is integrally injection molded with the nut 41. A limiting hole 441 parallel to the axis of the nut 41 is provided on the connector 44. The limiting hole 441 has a continuous hole wall. The limiting hole 441 is used to limit the spring guide rail 43 to prevent the spring guide rail 43 from radially escaping from the nut 41.

[0076] In this embodiment, the limiting hole 441 is located at the outermost end of the radial groove 418, and at least one reinforcing groove 442 is provided on the circumference of the inner diameter of the connecting member 44 for positioning during injection molding and increasing the connection strength with the nut 41. Specifically, the reinforcing groove 442 is a semicircular hole, and six semicircular holes are provided and evenly distributed on the circumference of the inner hole of the connecting member 44. In other embodiments, the reinforcing groove 442 may also be a polygon or other shapes.

[0077] In this embodiment, flat cut surfaces 419 are further provided on both sides of the connecting member 44 on the stage 411, which are used to avoid the spring guide rail 43 from interfering with the spring guide rail 43 on the stage 411 when the spring guide rail 43 is inserted into the limiting hole 441 and welded to the connecting member 44. The balancing hole 417 extending along the radial direction of the nut 41 is further provided on at least one of the flat cut surfaces 419, and the balancing hole 417 passes through the side wall of the nut 41 to keep the air pressure in the inner cavity and the outer cavity of the nut 41 balanced.

[0078] The spring guide 43 has an upper stopper 431, a spiral guide 432 and a lower stopper 433 connected in sequence. The spring guide 43 generally adopts a cylindrical spring. The spiral guide 432 as the main body of the spring guide 43 is a part of the cylindrical spring. The upper stopper 431 is a section of the cylindrical spring arranged along the axial direction of the nut 41 at the upper end of the spiral guide 432; the lower stopper 433 includes a first limiting section 4331 extending axially along the spring guide 43 for circumferential limiting, a second limiting section 4332 connected to the first limiting section 4331 and extending radially outward along the spring guide 43 for axial and circumferential limiting, and a third limiting section 4333 connected to the second limiting section 4332 and extending axially along the spring guide 43 for circumferential limiting. The stop ring 42 slides between the upper stopper 431 and the lower stopper 433 along the spiral guide 432. In this embodiment, since the first limiting section 4331 and the third limiting section 4333 both extend axially on the plane passing through the second limiting section 4332, the processing of the lower stop portion 431 and the spring guide rail 43 is facilitated, the complexity of the processing technology of the spring guide rail is reduced, and the processing efficiency is improved.

[0079] The first limiting section 4331 of the spring guide 43 cooperates with the axial groove 415 of the nut 41 to realize the circumferential limiting of the spring guide 43, the second limiting section 4332 of the spring guide 43 cooperates with the radial groove 418 of the nut 41 to realize the axial and circumferential limiting of the spring guide 43, and the third limiting section 4333 of the spring guide 43 is inserted into the limiting hole 441 of the connecting member 44 to realize the circumferential limiting of the spring guide 43, thereby preventing the spring guide 43 from radially escaping from the nut; in this embodiment, after the third limiting section 4333 is inserted into the limiting hole 441 of the connecting member 44, the third limiting section 4333 is fixed to the connecting member 44 by welding, so as to further form the axial limiting of the spring guide 43, and the combined limiting and welding fixing of the spring guide 43 greatly improves the firmness and stability of the spring guide connection. In this embodiment, the third limiting section 4333 constitutes the insertion section of the spring guide 43.

[0080] The stop ring 42 is spirally shaped and spirally matched with the spring guide rail 43. The end faces of the stop ring 42 at both ends are respectively an upper stop surface 421 and a lower stop surface 422 that are matched with the upper stop portion 431 and the lower stop portion 433. The stop ring 42 is provided with a protrusion 423 for matching with the electronic expansion valve rotor stop portion 33 between the upper stop surface 421 and the lower stop surface 422 at the middle position of the spiral line of the stop ring 42. In this way, the protrusion 423 matching with the rotor stop portion 33 is located at the stop The middle position of the moving ring 42 does not need to distinguish the upper and lower ends of the stop ring 42 during assembly, which improves the assembly efficiency; when the protrusion 423 contacts and cooperates with the rotor stop portion 33, the force on the stop ring 42 is more uniform, which is beneficial to the noise reduction of the electronic expansion valve and also improves the stopping accuracy; at the same time, the contact surfaces of the upper stop surface 421 and the lower stop surface 422 and the upper stop portion 431 and the lower stop portion 433 of the spring guide rail 43 are uniform in size, avoiding the phenomenon of jamming due to excessive stopping torque.

[0081] In this embodiment, the stop ring 42 is integrally formed, and a bent portion is formed between the upper stop surface 421 and the lower stop surface 422 at the middle position of the spiral line of the stop ring 42, and the bent portion forms a protrusion 423 for cooperating with the rotor stop portion 33; the rotor stop portion 33 is engaged with the outer side surfaces of both sides of the protrusion 423. In this way, the integrally formed structure facilitates the processing and manufacturing of the stop ring, and effectively ensures the overall strength of the stop ring.

[0082] like Fig. 9 As shown, the assembly method of the stopping device 4 in this embodiment is: first, along the spiral direction of the spring guide rail 43, the stopping ring 42 is made to coincide with the axis of the spring guide rail 43, and the stopping ring 42 is placed on the first spiral circle of the spring guide rail 43, and then the two are put together on the outer circumference of the nut 41, and the first limiting segment 4331 of the lower stopping portion 433 of the spring guide rail 43 is made to correspond to the axial groove 415, and the spring guide rail 43 is moved downward, so that the first limiting segment 4331 is inserted into the axial groove 415, the second limiting segment 4332 is inserted into the radial groove 418, and the third limiting segment 4333 is inserted into the limiting hole 441 of the connecting member 44, and the third limiting segment 4333 and the connecting member 44 are further fixed by welding. After completing the above operations, the spring guide rail 43 is fixed on the nut 41, and circumferential limiting and axial limiting are achieved at the same time.

[0083] The stopper 4 assembled in the above-mentioned assembly method and sequence is placed on the valve seat 6, that is, the valve seat matching section 413 of the nut 41 of the stopper 4 is inserted into the stepped hole 64 of the valve seat, and then the connector 44 is welded to the valve seat 6 at the butt joint 443 to reliably fix the nut 41 so that the nut 41 cannot rotate or be pulled out relative to the valve seat 6. After welding, the lower stopper 433 of the spring guide 43 is reliably restricted in a fixed position by the restriction of the third limiting section 4333 and the connector 44.

[0084] like Figure 3 As shown, after completing the assembly of the stop device 4 according to the above-mentioned assembly method, the valve stem 52 and the stop ring 42 are adjusted to the set positions; then the magnetic ring assembly 3 with the rotor stop portion 33 is assembled to the top of the valve stem 52 according to the set position, and the rotor connecting portion 32 and the valve stem 52 are welded and fixed to make the rotor 3 and the valve stem 52 connected as a whole. When the electronic expansion valve is working, the driving magnetic ring assembly 3 of the stator coil rotates, and the rotor stop portion 33 of the magnetic ring assembly 3 drives the stop ring 42 to rotate on the spiral guide portion 432 of the spring guide 43 by cooperating with the protrusion 423 of the stop ring 42; when the stop ring 42 rotates upward to the top, the upper stop portion 431 of the spring guide 43 contacts the upper stop surface 421 of the stop ring 42, thereby limiting the stop ring 42 from continuing to rotate upward, thereby playing the role of upper stopping; when the stop ring 42 rotates downward to the top, the lower stop portion 433 of the spring guide 43 contacts the lower stop surface 422 of the stop ring 42, thereby limiting the stop ring 42 from continuing to rotate downward, thereby playing the role of lower stopping.

[0085] Embodiment 2 of the electronic expansion valve in the utility model:

[0086] The purpose of this embodiment is to provide a different setting position of the limit hole. The main difference between this embodiment and embodiment 1 is that in this embodiment, the limit hole is set on the second step surface of the step of the nut.

[0087] Embodiment 3 of the electronic expansion valve in the utility model:

[0088] The purpose of this embodiment is to provide a different way of connecting the insertion section and the limiting hole. The main difference between this embodiment and Embodiment 1 is that in this embodiment, the insertion section and the limiting hole are fixed by gluing, or the insertion section is simply inserted into the limiting hole.

[0089] Embodiment 4 of the electronic expansion valve in the utility model:

[0090] The purpose of this embodiment is to provide a different structural form of an annular metal connector. The main difference between this embodiment and Embodiment 1 is that no reinforcement groove is provided on the circumference of the inner hole of the annular metal connector.

[0091] Embodiment 5 of the electronic expansion valve in the utility model:

[0092] The purpose of this embodiment is to provide a different structural form of the protrusion. The main difference between this embodiment and embodiment 1 is that the protrusion is a strip structure without an inner cavity, and the protrusion can be connected to the stop ring body by welding or other suitable methods; the two sides of the protrusion respectively have a stop surface that cooperates with the rotor stop in counterclockwise or clockwise rotation, so that when the stop ring changes the direction of movement, the rotor stop needs to idle for one circle before cooperating with the protrusion. As other embodiments, the protrusion is annular and has a closed annular inner cavity. The shape and size of the annular inner cavity can be adapted to the rotor stop. Specifically, the annular protrusion can be connected to the stop ring body by welding; the rotor stop cooperates with the inner wall stop of the annular inner cavity to avoid the idle stroke of the rotor stop in the rotation stroke, shorten the response time of the rotor, and reduce the noise generated by the collision between the rotor stop and the protrusion.

[0093] Embodiment 6 of the electronic expansion valve in the utility model:

[0094] The purpose of this embodiment is to provide a different position setting form of the protrusion. The main difference between this embodiment and Embodiment 1 is that the protrusion is arranged at any end of the stop ring. Preferably, the protrusion is arranged at the upper end of the stop ring.

[0095] Embodiment 7 of the electronic expansion valve in the utility model:

[0096] The purpose of this embodiment is to provide a different balancing hole position setting form. The main difference between this embodiment and Embodiment 1 is that the balancing hole is arranged at the bottom of the axial groove, or the balancing hole is arranged on the step between the first step surface and the second step surface, or at other suitable positions to achieve the balance of the air pressure in the inner and outer cavities of the nut.

[0097] Embodiment 8 of the electronic expansion valve in the utility model:

[0098] The purpose of this embodiment is to provide a different lower stop structure. The main difference between this embodiment and Embodiment 1 is that the first limit segment and the second limit segment are no longer provided, and only the third limit segment inserted into the limit hole is provided. Accordingly, the structure of the lower stop of the spring guide rail and the structure of the nut stage that cooperates with the lower stop to limit the position need to be partially adjusted.

[0099] Embodiment 9 of the electronic expansion valve in the utility model:

[0100] The purpose of this embodiment is to provide a different insertion section avoidance structure. The main difference between this embodiment and Embodiment 1 is that a flat section for avoiding the insertion section is no longer provided on the stage, and the position of the limiting hole is adjusted to the outside of the connection between the radial groove and the outer wall of the protruding part of the nut.

[0101] Embodiment 10 of the electronic expansion valve in the utility model:

[0102] The purpose of this embodiment is to provide a different structural form of annular metal connector. The main difference between this embodiment and Embodiment 1 is that the annular metal connector is no longer embedded on the outer peripheral surface of the nut by injection molding, but the connection with the valve seat of the electronic expansion valve is achieved directly by adjusting the stage structure of the nut platform.

[0103] Embodiment of the stopping device in the utility model:

[0104] The present invention further provides a stopping device, which is the same as the stopping device in the specific embodiment of the electronic expansion valve of the present invention, and will not be described in detail herein.

[0105] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A stop device, comprising a spring rail having an upper stopper and a lower stopper and a nut for mounting the spring rail, characterized in that: The nut is provided with a limiting hole parallel to the axis of the nut, the limiting hole has a continuous hole wall, and the lower stopper of the spring guide rail has an insertion section inserted into the limiting hole.

2. The stopper device according to claim 1, characterized in that: The inserting section and the limiting hole are fixed by welding.

3. The stopper device according to claim 1 or 2, characterized in that: The nut comprises a step portion, the step portion has a radially extending first step surface for supporting the spring guide rail and a second step surface for fixedly connecting with the valve seat of the electronic expansion valve, and the limiting hole is arranged on the second step surface.

4. The stopper device according to claim 1 or 2, characterized in that: An annular metal connector for fixedly connecting with the valve seat of the electronic expansion valve is integrally embedded on the outer peripheral surface of the nut by injection molding, and the limiting hole is arranged on the annular metal connector.

5. The stopper device according to claim 4, characterized in that: At least one reinforcement groove is arranged on the circumference of the inner hole of the annular metal connector.

6. The stopping device according to claim 1 or 2, characterized in that: The nut is provided with a balancing hole penetrating through the side wall.

7. The stopper device according to claim 6, characterized in that: The nut comprises a step stage, on which a plane section for avoiding the insertion section is arranged, and the balancing hole is arranged on the plane section along the radial direction of the nut.

8. The stopping device according to claim 1 or 2, characterized in that: The stopping device also includes a stopping ring which is spirally matched with the spring guide rail. The end faces at both ends of the stopping ring are stop surfaces which are respectively matched with the upper stop part and the lower stop part. A protrusion which is used to cooperate with the rotor stop part of the electronic expansion valve is arranged between the two stop surfaces at the middle position of the spiral line of the stopping ring.

9. The stopper device according to claim 8, characterized in that: The stop ring is integrally formed, and the protrusion is a bent portion of the stop ring.

10. An electronic expansion valve, comprising a valve needle and a stopper for controlling the opening and closing stroke of the valve needle, characterized in that: The stopping device is the stopping device according to any one of claims 1 to 9.

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