CN109958779A - Electronic expansion valve rotor assembly - Google Patents

Abstract

An electronic expansion valve rotor assembly consists of a stop rod, a rotor casing, a positioning shaft, a positioning support, a guide nut, a welding ring, a valve seat, a direct pipe, an elbow pipe, a guide shaft, a slip ring, a connecting sleeve, a magnetic ring , screw shaft, valve needle spring, gasket, valve needle, positioning bracket. By optimizing the design, the plasticization rate of the product is improved, the production efficiency is improved, and the production cost is reduced. The positioning shaft and stop rod are directly injected into the positioning support as inserts; the injection-molded guide nut is used, and the stainless steel welding ring for welding and consolidation with the valve seat is inserted during injection molding; the injection-molded rigid guide shaft is used to replace The original flexible spring guide rail has a stable and reliable benchmark for the assembly of the slip ring, creating conditions for the automatic assembly of the slip ring and the guide shaft.

Description

An electronic expansion valve rotor assembly

technical field

The invention relates to an electronic expansion valve rotor assembly.

Background technique

The main structure of the existing electronic expansion valve rotor assembly is basically similar, the valve seat is fixed with the guide nut, the screw shaft and the magnetic ring are injection-molded into one, the positioning shaft is fixed with the screw shaft, and the valve needle spring, The valve needle is locked with a locking sleeve, the valve needle has a certain degree of freedom of movement under the action of the valve needle spring, the positioning shaft is provided with a spring guide rail and a slip ring, the screw shaft and the guide nut are threadedly connected, and a stop rod is provided. The positioning support is fixed with the rotor casing, the rotor casing is fixed with the valve seat, and the valve seat is provided with a horizontal pipe and a vertical pipe. The rotor assembly rotates the rotor magnetic ring under the action of the stator energized coil, and drives the screw shaft to rise and fall under the action of the slip ring, the spring guide rail and the stop rod, so as to complete the opening and closing change of the valve composed of the valve needle and the valve seat. However, in its production and assembly process, since the slip ring and the spring guide rail are both flexible winding parts, the entanglement of the two flexible parts brings great difficulty to automatic assembly. This assembly process is still manually operated, so the assembly efficiency is relatively high. In view of the existence of the above problems, people in the industry are working hard to optimize the structure of product parts, simplify the process, reduce costs, and explore ways to automate product production and assembly.

SUMMARY OF THE INVENTION

The invention comprehensively improves the design of the casing assembly, the valve seat assembly and the rotor components, improves the plasticization rate of the product parts, improves the production efficiency, reduces the production cost, adjusts the production process of the casing assembly, and adjusts the positioning shaft and the stop rod. As an insert, it is directly injection-molded into the positioning support and combined with the rotor housing to form a housing assembly. Adjust the structural design and processing plan of the valve seat assembly. The guide nut is made of injection molded parts, and a stainless steel welding ring for consolidating with the valve seat is placed during injection molding, and the valve seat is welded with the valve seat to form the valve seat assembly. Adjusting the internal structural design of the rotor parts, using injection-molded rigid guide rail shafts to replace the original flexible spring guide rails, makes the slip ring assembly process have a stable and reliable benchmark, and creates conditions for the automatic assembly of the slip ring and guide rail shafts.

The present invention is realized in this way, it is composed of a casing assembly consisting of a stop rod, a rotor casing, a positioning shaft, and a positioning support; a valve seat assembly composed of a guide nut, a welding ring, a valve seat, a direct pipe and an elbow pipe; a guide rail Shaft, slip ring, connecting sleeve, magnetic ring, screw shaft, valve needle spring, gasket, rotor parts composed of valve needle and positioning bracket. The positioning shaft is a stainless steel smooth round rod, which is an injection-molded insert of the positioning support, and the inserting part is intended to be scribed and brushed to increase the bonding firmness. The stop rod is a stainless steel rectangular strip, which is an injection molding insert of the positioning support; the positioning support is made of plastic injection molding, and the overall shape is a cylinder with an arc surface at the upper end, and the arc surface end is provided with a through hole. The arc surface matches the arc surface of the inner bottom end of the rotor shell. The bottom end of the positioning support is generally a plane, the center of the vertical plane is set with the positioning shaft insert, and the side of the positioning shaft is provided with a stop rod insert, which surrounds the stop The root of the moving rod is provided with a flange for reinforcing the stop rod. The rotor shell is a cylindrical thin-walled part, and the arc surface at the bottom end matches the positioning support. When the positioning support is assembled in place, it is locked by pressing the riveting pit on the rotor shell. The guide nut is made of plastic injection molding, and the overall shape is in the shape of a circular step. The large end of the outer circle is provided with a stainless steel welding ring insert welded with the valve seat. The stepped hole, the large end is a light hole, and the small end is provided with an internal thread that engages with the thread of the screw shaft. The shape of the valve seat is in the shape of a circular step, with a stepped hole in the center, a counterbore for installing a welding ring at the large end of the flared end, a cone hole matched with the cone tip of the valve needle at the small end, and a conical diffusion hole at the outer end of the cone hole. The outer side of the conical diffusion hole is the small end step of the valve seat, which is consolidated with the direct pipe, and the lower part of the middle section of the valve seat is opened with an elbow pipe; the combination of the guide nut and the valve seat is realized by laser welding process. The guide rail shaft is an injection-molded threaded short shaft with a ventilation hole along the center line of the shaft, and the external thread replaces the function of the traditional spring guide rail. Under the premise, part of the thread of the guide shaft can be appropriately removed. The thread screw inlet of the guide shaft is provided with a non-return wedge-shaped stopper. The slip ring can exceed the wedge-shaped stop through its own elastic deformation. The insurmountable light circle segment limits the movement range of the slip ring, and the screwing in of the slip ring is simple and convenient. The light circle of the guide rail shaft is also provided with a shoulder for installing the connecting sleeve, and the front end of the shoulder is also provided with a guide step for installing the valve needle spring. The connecting sleeve is made of stainless steel, the shape is approximately a stepped circular ring, and the large end of the outer diameter is provided with a convex ring, and the convex ring is integrally injected with the magnetic ring. The shape of the screw shaft is in the shape of a circular step, the small end is provided with an external thread to engage with the guide nut, the outer diameter of the middle part is matched with the stepped hole of the guide nut, and the large end is matched with the connecting sleeve; the center of the screw shaft is provided with a stepped hole, and the small The diameter of the end is matched with the valve needle with the shoulder, and the valve needle shoulder, gasket and valve needle spring are installed in the middle area of the stepped hole. The large end area of the stepped hole is matched with the guide shaft shoulder. of air holes. The positioning bracket is a ring-shaped part, and the half circumference of the ring is provided with a plurality of positioning holes for positioning between the rotor and the stator, and is made of stainless steel. When assembling the rotor parts, put the valve needle, gasket and valve needle spring into the hole of the screw shaft in turn, and the guide shaft is loaded from the end of the connecting sleeve, then press the big end of the screw shaft into the connecting sleeve, and use laser welding to weld them. Lock and screw the slip ring into the guide shaft. General assembly: screw the screw shaft of the rotor part into the guide nut of the valve seat assembly, and then insert the positioning shaft of the casing assembly into the center hole of the guide shaft, the rotor casing is buckled at the shoulder corresponding to the valve seat, and welded and fixed, and the rotor casing is welded. A positioning bracket is sleeved above the welding part of the shell and locked with a welding point.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings.

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 of the present invention.

FIG. 3 is a top view of FIG. 1 of the present invention.

FIG. 4 is a schematic structural diagram of the valve seat assembly of the present invention.

FIG. 5 is a schematic structural diagram of the housing assembly of the present invention.

FIG. 6 is a schematic structural diagram of the rotor component of the present invention.

FIG. 7 is a top view of FIG. 6 of the present invention.

Fig. 8 is a three-dimensional view of the guide rail shaft of the present invention.

9 is a structural view of a conventional electronic expansion valve rotor assembly.

In the figure, 1, stop rod; 2, rotor housing; 3, positioning shaft; 4, positioning support; 5, guide shaft; 6, valve needle spring; 7, positioning bracket; 8, welding ring; 9, gasket; 10, valve needle; 11, valve seat; 12, direct pipe; 13, elbow pipe; 14, screw shaft; 15, guide nut; 16, connecting sleeve; 17, magnetic ring; 18, slip ring; b, wedge Block; c, riveting pressure pit; d, air guide hole.

Detailed ways

The present invention comprises a casing assembly consisting of a stop rod (1), a rotor casing (2), a positioning shaft (3) and a positioning support (4); a guide nut (15), a welding ring (8), a valve seat (11) ), the direct pipe (12), the valve seat assembly composed of the elbow pipe (13); the guide shaft (5), the slip ring (18), the connecting sleeve (16), the magnetic ring (17), the screw shaft (14) , valve needle spring (6), gasket (9), valve needle (10) composed of rotor components and positioning bracket (7). The positioning shaft (2) is a stainless steel smooth round rod, which is an injection-molded insert of the positioning support (4), and the embedded part is to be scribed and brushed to increase the bonding firmness. The stop rod (1) is a stainless steel rectangular strip, which is an injection molding insert of the positioning support (4). Cylinder, the end of the arc surface is provided with a hollow groove, the arc surface matches the arc surface of the inner bottom end of the rotor shell (2), the bottom end of the positioning support (4) is generally a plane, and the center of the vertical plane sets the positioning axis ( 3) Insert, a stop rod (1) insert is provided on the side of the positioning shaft (3), and a flange for reinforcing the stop rod (1) is arranged around the root of the stop rod (1). The rotor housing (2) is a cylindrical thin-walled part, and the circular arc surface at the bottom end matches the positioning support (4). The pressure pit (c) is locked. The guide nut (15) is made of plastic injection molding, and the overall shape is in the shape of a circular step. A rib plate is arranged in the axial direction below, a stepped hole is arranged in the center of the guide nut (15), the large end is a light hole, and the small end is provided with an internal thread that is threadedly engaged with the screw shaft (14). The valve seat (11) has a circular stepped shape, a stepped hole in the center, a counterbore for installing the welding ring (8) in the flared end of the large end, and a taper hole matched with the cone tip of the valve needle (10) at the small end. The outer end of the hole is provided with a conical diffusion hole, and the outer side of the conical diffusion hole is the small end step of the valve seat (11), which is consolidated with the direct pipe (12), and the lower part of the middle section of the valve seat (11) is opened with a curved pipe (13). ; The combination of the guide nut (15) and the valve seat (11) is realized by a laser welding process. The guide rail shaft (5) is an injection-molded threaded short shaft with a ventilation hole along the shaft centerline, and the external thread replaces the function of the traditional spring guide rail. Frictional resistance, part of the thread of the guideway shaft (5) can be appropriately removed without affecting the screwing. The wedge-shaped block (b) can be exceeded by its own elastic deformation, and the other end of the guide shaft (5) is provided with a smooth circle segment that the slip ring (18) cannot pass through to limit the movement range of the slip ring (18). The screw-in of (18) is simple and convenient. A shoulder for installing the connecting sleeve (16) is also provided at the light circle of the guide rail shaft (5), and a guide step for installing the valve needle spring (6) is also arranged at the front end of the shoulder. The connecting sleeve (16) is made of stainless steel, and the shape is approximately a stepped circular ring. A convex ring is provided at the large end of the outer diameter, and the convex ring is integrally injected with the magnetic ring (17). The external thread of the screw shaft (14) is in the shape of a circular step, the small end is provided with an external thread to engage with the guide nut (15), the outer diameter of the middle part is clearance fit with the stepped hole of the guide nut (15), and the large end is connected with the connecting sleeve (16). ) to fit; the center of the screw shaft (14) is provided with a stepped hole, the small end hole diameter fits with the valve needle (10) with a shoulder, and the valve needle (10) shoulder, gasket (9), valve and valve are installed in the middle area of the stepped hole. In the needle spring (6), the large end area of the stepped hole matches the shoulder of the guide rail shaft (5), and the middle area of the stepped hole is also provided with an air guide hole (d) that runs through the outer circle. The positioning bracket (7) is a ring-shaped part, and the half circumference of the ring is provided with a plurality of positioning holes for positioning between the rotor and the stator, and is made of stainless steel. When assembling the rotor parts, install the valve needle (10), washer (9), and valve needle spring (6) into the hole of the screw shaft (14) in sequence, and the guide shaft (5) is installed from the end of the connecting sleeve (16). Then press the big end of the screw shaft (14) into the connecting sleeve (16), lock it with laser welding, and screw the slip ring (18) into the guide shaft (5). Assembly: Screw the screw shaft (14) of the rotor part into the guide nut (15) of the valve seat assembly, and then insert the positioning shaft (3) of the housing assembly into the center hole of the guide shaft (5), and the rotor housing (2) is fastened to the valve The corresponding shoulder of the seat (11) is welded and consolidated, and a positioning bracket (7) is sleeved above the welding place of the rotor shell (2), and locked with the welding point.

To sum up, the beneficial effects achieved by the present invention are: the structure of the parts is simplified, the overall plasticization rate is improved, and the injection molding process can significantly improve the production efficiency and greatly reduce the manufacturing cost. The structure of the spring guide rail and the positioning shaft is optimized into a dimensionally stable rigid guide shaft, and it becomes the benchmark for installing the slip ring, which creates favorable conditions for the automatic assembly of the slip ring.

Claims (5)

1. a kind of electric expansion valve rotor assembly, it is characterized in that it is by arresting lever, rotor case, locating shaft, positioning support, guiding Nut, welding ring, valve seat, directly pipe, bend connector, lead rail axis, slip ring, connector sleeve, magnet ring, screw axis, needle spring, gasket, Needle, locating support are formed；The positioning support is formed by plastic injection, and general shape is cylinder of the upper end with cambered surface Body, curved end are equipped with the groove of transmission, and cambered surface and rotor case inner lower edge cambered surface are coincide, and it is flat that positioning support bottom end is generally one Face, vertical plane center set locating shaft, and locating shaft side is equipped with arresting lever, are equipped with around arresting lever root and reinforce the convex of arresting lever Edge；The spigot nut is formed by plastic injection, and shape is totally in rotary table scalariform, and outer circle big end is equipped with valve seat welding not Become rusty steel welding ring inserts, and spigot nut is equipped with gusset axially below, and spigot nut center sets stepped hole, and big end is unthreaded hole, small End sets the internal screw thread engaged with screw rod axle thread.

2. a kind of electric expansion valve rotor assembly according to claim 1, it is characterized in that the lead rail axis is along axis Heart line is equipped with the injection molding threaded stub of venthole, is threaded into the wedge block that mouth is equipped with non-return, and the lead rail axis other end, which is equipped with, to be slided The smooth and round section that ring can not be gone beyond is additionally provided with the shoulder block of installation connector sleeve at light circle, and shoulder block front end is additionally provided with installation needle spring It is oriented to step.

3. a kind of electric expansion valve rotor assembly according to claim 1, it is characterized in that the locating shaft is stainless steel Light pole, it is integral by being directly molded with positioning support as injection molding inserts.

4. a kind of electric expansion valve rotor assembly according to claim 1, it is characterized in that the arresting lever is stainless steel Rectangle billot, it is integral by being directly molded with positioning support as injection molding inserts.

5. a kind of electric expansion valve rotor assembly according to claim 1, it is characterized in that the screw axis shape is in circle Step-like, small end sets external screw thread and engages with spigot nut, the stepped hole clearance fit of middle part outer diameter and spigot nut, big end and company Female connector cooperation；Screw rod axis center sets stepped hole, the needle clearance fit in small end aperture and shouldered, the installation of stepped hole central region Needle shoulder block, gasket, needle spring, the big end regions of stepped hole are matched with lead rail axis shoulder block, stepped hole central region be additionally provided with The gas port of outer circle perforation.