CN211288794U

CN211288794U - Improved electronic expansion valve rotor assembly

Info

Publication number: CN211288794U
Application number: CN201922361941.9U
Authority: CN
Inventors: 何泽淼
Original assignee: Zhejiang Hengsen Industry Group Co ltd
Current assignee: Zhejiang Hengsen Industry Group Co ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-08-18
Anticipated expiration: 2029-12-25

Abstract

An improved rotor assembly of an electronic expansion valve comprises a positioning support, a positioning shaft, a stop rod, a rotor shell, a sliding ring, a valve needle spring, a screw rod shaft, a positioning support, a valve needle locking sleeve, a bent connecting pipe, a direct pipe, a valve core, a valve seat, a valve needle, a welding ring, a guide nut, a spring seat, a connecting sleeve, a magnetic ring and a guide rail shaft. Through the optimal design of parts such as the positioning support, the valve needle locking sleeve and the like, a socket cavity in the positioning support is eliminated, the refrigerant flows smoothly in the expansion valve, the influence of the refrigerant on noise due to pressure change is reduced, and the expansion valve has a positive effect on reducing and controlling the working noise of the expansion valve.

Description

Improved electronic expansion valve rotor assembly

Technical Field

The utility model relates to an improvement type electronic expansion valve rotor assembly.

Background

The main structure of the existing electronic expansion valve rotor assembly is basically similar, a valve seat is fixedly connected with a guide nut, a screw rod shaft and a magnetic ring are molded into a whole by injection, a positioning shaft is fixedly connected with the screw rod shaft, a valve needle spring is arranged in the screw rod shaft, a valve needle is locked by a locking sleeve, the valve needle has certain freedom of movement under the action of the valve needle spring, a spring guide rail and a sliding ring are arranged on the positioning shaft, the screw rod shaft is in threaded connection with the guide nut, a positioning support provided with a stop rod is fixedly connected with a rotor shell, the rotor shell is fixedly connected with the valve seat, and a bent pipe. The rotor assembly rotates under the action of the stator electrified coil, and drives the screw rod shaft to lift under the action of the sliding ring, the spring guide rail and the stop rod so as to complete the change of opening and closing of the valve formed by the valve needle and the valve seat. With the continuous development of the process level, the structural shape of parts is changed, the integral plasticizing rate of products is improved, the production cost is obviously reduced, and the existing detail problems are also noticed, for example, in the positioning support part for injection molding, a reinforcing rib plate in the original design is arranged at one end of an arc contact surface of a rotor shell, so that a plurality of pockets are formed between the positioning support and the arc top of the rotor shell, and part of refrigerant is accumulated or retained in the pockets. In addition, the reliability of the valve needle locking method is to be improved. In view of the above problems, we will optimize the partial structure of the product.

Disclosure of Invention

The utility model discloses an optimal design to parts such as positioning support, needle locking cover has eliminated the nest chamber in the positioning support, makes the refrigerant flow smoothly in the expansion valve, reduces the influence of refrigerant pressure variation to the noise, has positive effect to the noise that reduces and control the expansion valve. The mode of valve needle locking is properly adjusted, and the valve needle locking sleeve and the valve needle are fixedly connected by laser welding.

The utility model discloses a realize like this, it comprises location support, location axle, stop lever, rotor housing, sliding ring, needle spring, lead screw axle, locating support, needle locking cover, elbow pipe, direct pipe, case, disk seat, needle, welding ring, guide nut, spring holder, adapter sleeve, magnetic ring, guide rail axle. The positioning shaft is a stainless steel smooth round bar, is an injection molding insert of the positioning support, and is roughened at the embedding part to increase the combination firmness. The stop rod is a stainless steel rectangular strip material and is an injection molding insert of the positioning support; the positioning support is formed by plastic injection molding, the positioning shaft and the stop rod are combined together as an insert, the overall appearance of the positioning support is a cylinder with a cambered surface at the upper end, the cambered surface is matched with the cambered surface at the bottom end of the inner side of the rotor shell, the bottom end of the inner side of the positioning support is approximately a plane and provided with a through groove, the insert positioning shaft is arranged at the center of a vertical plane, the insert stop rod is arranged beside the positioning shaft, and a flange for reinforcing the stop rod is arranged around the root of the stop rod. The rotor shell is a cylindrical thin-wall part, the arc surface at the bottom end is matched with the positioning support, and when the positioning support is assembled in place, the positioning support is locked by riveting a pit through the rotor shell. The guide nut is formed by plastic injection molding, the appearance is generally in a step shape of a circular truncated cone, an insert welding ring for welding with the valve seat is arranged at the large end of the outer circle, a stepped hole is formed in the center of the guide nut, the large end is a smooth hole, and an internal thread meshed with the screw shaft thread is arranged at the small end. The valve seat is in a circular step shape, a stepped hole is formed in the center of the valve seat, a counter bore for installing a welding ring is formed in a large-end flaring hole, a hole diameter matched with the valve core is formed in a small end of the valve seat, the valve core is connected with a direct pipe, a guide hole matched with the valve needle in a clearance mode is formed in the middle of the valve seat, a transverse hole matched with a bent connecting pipe is formed in a cavity section below the guide hole, and the welding ring on the guide nut is combined with the valve seat through a laser welding process. The guide rail shaft is an injection molding threaded short shaft provided with a vent hole along the central line of the shaft, and the external threads replace the function of the traditional spring guide rail. The lower end of the guide rail shaft is provided with a retaining shoulder for installing the connecting sleeve, and the front end of the retaining shoulder is also provided with a guide step for installing a valve needle spring. The connecting sleeve is made of stainless steel materials, the shape of the connecting sleeve is similar to a step ring shape, a convex ring is arranged at the large outer diameter end, and the convex ring and the magnetic ring are molded into a whole. The screw rod shaft is in a round platform step shape, the small end is provided with an external thread which is meshed with the guide nut, the outer diameter of the middle part is in clearance fit 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, the aperture of the small end of the stepped hole is in clearance fit with a valve needle locking sleeve, the middle area of the stepped hole is provided with the valve needle locking sleeve, a spring seat and a valve needle spring, the large end area of the stepped hole is matched with a guide rail shaft retaining shoulder, and the middle area of the stepped hole is also provided with a flow guide hole communicated with an excircle. The valve core is in a step-shaped circular truncated cone shape, the large end is fixedly connected with the valve seat, the small end is provided with the direct pipe, the center of the valve core is provided with a through hole with two conical ends, and the conical degree of the conical hole at the large end is matched with that at the corresponding position of the valve needle. The valve needle is a cylindrical rod piece with one end provided with a conical head, a section of step in clearance fit with the middle aperture of the valve seat is arranged above the conical head, the other end of the valve needle is provided with a small-diameter shaft stop matched with the aperture of the valve needle locking sleeve, and the valve needle locking sleeve are welded by laser. When the rotor is assembled, a screw rod shaft is sleeved into a valve needle, a valve needle locking sleeve is buckled at a small-diameter shaft stop of the valve needle and is fixed by laser spot welding, a spring seat and a valve needle spring are sequentially arranged in a hole of the screw rod shaft, a guide rail shaft is arranged from the end of the connecting sleeve, then the large end of the screw rod shaft is pressed into the connecting sleeve and is locked by laser welding, and a sliding ring is screwed into the guide rail shaft. The guide nut is welded and fixed with the valve seat through the welding ring, the screw rod shaft is screwed into the guide nut, the positioning shaft in the positioning support and the rotor shell assembly is inserted into the central hole of the guide rail shaft, the rotor shell is buckled at the position of the corresponding retaining shoulder of the valve seat and is welded and fixed, the positioning support is sleeved above the welding position of the rotor shell, and the rotor shell is locked by using a welding point. The valve core, the bent connecting pipe and the direct pipe are arranged below the valve seat and are welded and fixed.

Drawings

The present invention will be further described with reference to the accompanying drawings.

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

Fig. 2 is a schematic view of the mutual position structure of the screw shaft, the valve needle and the valve needle locking sleeve of the present invention.

Fig. 3 is a sectional view of the valve seat of the present invention.

Fig. 4 is the structure diagram of the combination of the injection molding positioning support, the insert positioning shaft and the stop rod of the present invention.

Fig. 5 is a sectional view of the valve core of the present invention.

Fig. 6 is a perspective view of the injection molding positioning support, the insert positioning shaft and the stop rod combination structure of the present invention.

In the figure 1, a support is positioned; 2. positioning the shaft; 3. a stopper rod; 4. a rotor housing; 5. a slip ring; 6. a valve needle spring; 7. a screw shaft; 8. positioning the bracket; 9. a valve needle locking sleeve; 10. bending the connecting pipe; 11. a direct pipe; 12. a valve core 13 and a valve seat; 14. a valve needle; 15. welding a ring; 16. a guide nut; 17. a spring seat; 18. connecting sleeves; 19. a magnetic ring; 20. a guide rail shaft; a. laser welding points c and riveting pits; e. and (4) flow guide holes.

Detailed Description

The utility model discloses constitute by location support (1), location axle (2), stop lever (3), rotor housing (4), sliding ring (5), needle spring (6), lead screw axle (7), locating support (8), needle locking cover (9), elbow pipe (10), direct pipe (11), case (12), disk seat (13), needle (14), welding ring (15), guide nut (16), spring holder (17), adapter sleeve (18), magnetic ring (19), guide rail axle (20). The positioning shaft (2) is a stainless steel smooth round bar, is an injection molding insert of the positioning support (1), and the embedding part is roughened to increase the combination firmness. The stop rod (3) is a stainless steel rectangular strip material and is an injection molding insert of the positioning support (1); location support (1) mould plastics by plastics and form, and combine together location axle (2) and stop lever (3) as the inserts, location support (1) overall appearance is the cylinder of cambered surface in the upper end area, the cambered surface coincide with rotor housing (4) inboard bottom cambered surface, location support (1) inboard bottom is approximate to a plane, is equipped with the recess that passes through the sky, insert location axle (2) are established at the vertical plane center, location axle (2) side is equipped with inserts stop lever (3), be equipped with the flange of consolidating the stop lever around stop lever (3) root. The rotor shell (4) is a cylindrical thin-wall piece, the arc surface at the bottom end of the rotor shell is matched with the positioning support (1), and when the positioning support (1) is assembled in place, the positioning support is locked by riveting and pressing a pit (c) through the rotor shell (4). The guide nut (16) is formed by plastic injection molding, the appearance of the guide nut is generally in a shape of a circular truncated cone step, an insert welding ring (15) for welding with the valve seat (13) is arranged at the large end of the excircle, a stepped hole is formed in the center of the guide nut (16), the large end of the guide nut is a smooth hole, and an internal thread meshed with a screw rod shaft (7) is arranged at the small end of the guide nut. The valve seat (13) is in a circular step shape, a step hole is formed in the center, a counter bore for installing a welding ring (15) is formed in a large-end flaring hole, a hole diameter matched with the valve core (12) is formed in a small end, the valve core (12) is connected with the direct pipe (11), a guide hole in clearance fit with the valve needle (14) is formed in the middle of the valve seat (13), a transverse hole for arranging the bent connecting pipe (10) is formed in a cavity section below the guide hole, and the welding ring (15) on the guide nut (16) is combined with the valve seat (13) by adopting a laser welding process. The guide rail shaft (20) is an injection molding threaded short shaft provided with a vent hole along the central line of the shaft, and the external threads replace the function of the traditional spring guide rail. The lower end of the guide rail shaft (20) is provided with a blocking shoulder for installing the connecting sleeve (18), and the front end of the blocking shoulder is also provided with a guide step for installing the valve needle spring (6). The connecting sleeve (18) is made of stainless steel material, the shape is similar to a step ring shape, a convex ring is arranged at the large outer diameter end, and the convex ring and the magnetic ring (19) are molded into a whole. The screw rod shaft (7) is in a truncated cone step shape, the small end is provided with an external thread which is meshed with the guide nut (16), the middle outer diameter is in clearance fit with a stepped hole of the guide nut (16), and the large end is matched with the connecting sleeve (18); a stepped hole is formed in the center of the screw shaft (7), the aperture of the small end of the screw shaft is in clearance fit with a valve needle (14) with a valve needle locking sleeve (9), the valve needle locking sleeve (9), a spring seat (17) and a valve needle spring (6) are installed in the middle area of the stepped hole, the large end area of the stepped hole is matched with a blocking shoulder of the guide rail shaft (20), and a flow guide hole (e) which is communicated with an outer circle is further formed in the middle area of the stepped hole. The valve core (12) is in a shape of a step-shaped circular truncated cone, the large end is fixedly connected with the valve seat (13), the small end is provided with the direct pipe (11), the center of the valve core (12) is provided with a through hole with two conical ends, and the conical degree of the conical hole at the large end is matched with the conical degree of the corresponding position of the valve needle (14). Valve needle (14) be the cylindric member of one end area conical head, conical head top has one section and disk seat (13) middle aperture clearance fit's step, the other end of valve needle (14) is equipped with the minor diameter axle bumper that matches with valve needle locking cover (9) aperture, valve needle (14) and valve needle locking cover (9) adopt laser welding. When the rotor is assembled, a screw rod shaft (7) is sleeved into a valve needle (14), a valve needle locking sleeve (9) is buckled at a small-diameter shaft stop of the valve needle (14), the small-diameter shaft stop is fixed at a laser welding point (a) in a spot welding mode, a spring seat (17) and a valve needle spring (6) are sequentially installed in a hole of the screw rod shaft (7), a guide rail shaft (20) is installed from the end of a connecting sleeve (18), then the large end of the screw rod shaft (7) is pressed into the connecting sleeve (18) and locked by laser welding, and a sliding ring (5) is screwed into the guide rail shaft (20). The guide nut (16) is welded and fixed with the valve seat (13) through the welding ring (15), the screw rod shaft (7) is screwed into the guide nut (16), then the positioning support (1) and the positioning shaft (2) in the rotor shell (4) assembly are inserted into the central hole of the guide rail shaft (20), the rotor shell (4) is buckled at the position of a retaining shoulder corresponding to the valve seat (13) and is welded and fixed, the positioning support (8) is sleeved above the welding position of the rotor shell (4), and the rotor shell is locked by welding points. A valve core (12), a bent connecting pipe (10) and a direct pipe (11) are arranged below the valve seat (13) and are welded and fixed.

Claims

1. An improved rotor assembly of an electronic expansion valve is characterized by comprising a positioning support, a positioning shaft, a stop rod, a rotor shell, a sliding ring, a valve needle spring, a screw shaft, a positioning support, a valve needle locking sleeve, a bent connecting pipe, a direct pipe, a valve core, a valve seat, a valve needle, a welding ring, a guide nut, a spring seat, a connecting sleeve, a magnetic ring and a guide rail shaft; the positioning support is formed by plastic injection molding, the positioning shaft and the stop rod are combined together as an insert, the overall appearance of the positioning support is a cylinder with a cambered surface at the upper end, the cambered surface is matched with the cambered surface at the bottom end of the inner side of the rotor shell, the bottom end of the inner side of the positioning support is approximately a plane and is provided with a through groove, the center of a vertical plane is provided with the insert positioning shaft, the side of the positioning shaft is provided with the insert stop rod, and a flange for reinforcing the stop rod is arranged around the root of the stop rod; the rotor shell is a cylindrical thin-wall part, and the arc surface at the bottom end is matched with the positioning support; the guide nut is formed by plastic injection molding, the appearance of the guide nut is generally in a round platform step shape, an insert welding ring for welding with a valve seat is arranged at the large end of the excircle, a stepped hole is formed in the center of the guide nut, the large end is a smooth hole, and an internal thread meshed with a screw rod shaft thread is arranged at the small end; the valve seat is in a circular step shape, a step hole is formed in the center of the valve seat, a counter bore for installing a welding ring is formed in a large-end flaring hole, a hole diameter matched with the valve core is formed in a small end of the valve seat, a guide hole in clearance fit with the valve needle is formed in the middle of the valve seat, and a transverse hole for configuring a bent connecting pipe is formed in a cavity section below the guide hole; the guide rail shaft is an injection molding thread short shaft provided with a vent hole along the central line of the shaft and is provided with an external thread, the lower end of the guide rail shaft is provided with a retaining shoulder for installing a connecting sleeve, and the front end of the retaining shoulder is also provided with a guide step for installing a valve needle spring; the connecting sleeve is made of stainless steel material, the shape of the connecting sleeve is similar to a step ring shape, a convex ring is arranged at the large outer diameter end, and the convex ring and the magnetic ring are molded into a whole; the screw rod shaft is in a round platform step shape, the small end is provided with an external thread which is meshed with the guide nut, the outer diameter of the middle part is in clearance fit 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, the aperture of the small end of the stepped hole is in clearance fit with a valve needle locking sleeve, the middle area of the stepped hole is provided with the valve needle locking sleeve, a spring seat and a valve needle spring, the large end area of the stepped hole is matched with a guide rail shaft retaining shoulder, and the middle area of the stepped hole is also provided with a flow guide hole communicated with an excircle.

2. An improved rotor assembly of electronic expansion valve as defined in claim 1, wherein said valve core is shaped like a stepped circular truncated cone, the large end is fixedly connected to the valve seat, the small end is provided with a straight pipe, the center of the valve core is provided with a through hole with two tapered ends, and the taper of the tapered hole at the large end is matched with the taper at the corresponding position of the valve needle.

3. An improved rotor assembly for electronic expansion valve as defined in claim 1, wherein said valve needle is a cylindrical rod with a conical head at one end, a step is formed above the conical head to fit the central aperture of the valve seat, and a small-diameter stop is formed at the other end of the valve needle to match the aperture of the valve needle locking sleeve.