CN210661389U

CN210661389U - Electronic expansion valve

Info

Publication number: CN210661389U
Application number: CN201921790299.XU
Authority: CN
Inventors: 不公告发明人
Original assignee: JIANGXI AUDY BRASSWORK Inc
Current assignee: JIANGXI AUDY BRASSWORK Inc
Priority date: 2019-10-24
Filing date: 2019-10-24
Publication date: 2020-06-02
Anticipated expiration: 2029-10-24

Abstract

The utility model discloses an electronic expansion valve, including shell, disk seat, import pipe, outlet pipe, valve rod, needle, rotor core, magnetic ring and spring, the import pipe is installed on the lateral wall of shell, the outlet pipe is installed in the disk seat bottom, the valve rod is moulded plastics on the boss of disk seat upper end, needle from the top down includes erection section, platform stage, guide section, changeover portion and flow section in proper order, the diameter of changeover portion is less than the diameter of guide section, the length of guide section bottom to step section is less than the length of guiding hole, the length of changeover portion is greater than valve full-closing to the stroke distance of opening entirely, and the changeover portion can effectively keep away the overlap burr that valve rod guide section bottom exists, does not have the friction interference when making the valve body action, effectively avoids the phenomenon of the valve action that the friction that leads to because of the friction drops and cause when the valve action.

Description

Electronic expansion valve

Technical Field

The utility model relates to a fluid control part technical field, in particular to electronic expansion valve.

Background

Electronic expansion valves are commonly used in air conditioning heat pump systems. The electronic expansion valve consists of a coil and a valve body with a magnetic rotor, and the rotor part is sealed in the valve body. The controller controls the rotation of the rotor part of the valve body by sending a pulse signal to the coil, and then converts the rotary motion of the rotor part into axial linear movement of the valve needle through thread transmission, so that the flow area of the valve port is adjusted, and the flow rate of a refrigerant is adjusted.

The needle is installed in the cavity valve rod of taking the external screw thread, the valve rod is processed through the mode of moulding plastics, it inlays on the boss of disk seat directly to mould plastics the valve rod through the mould, through directly moulding plastics in disk seat product structure, divide into inside and be equipped with hollow guiding hole and business turn over gas antithetical couplet through-hole, inlet port and guiding hole vertical structure, insert through the mould inside and generate vertically guiding hole and business turn over gas pocket with the plug, in actual course of working, because of need reach certain injection moulding pressure, this vertical cross position can produce the overlap burr that a week is little, and here space is compact, can't remove through the post processing. When the needle is inside to be axial linear motion and adjust flow, can produce the friction with this department's overlap burr, in case the in-process produces the burr and drops, on being attached to the screw thread pair along with inside fluid, can lead to the screw thread card to die, lead to the valve functional failure, to the action stability of valve, there is very big hidden danger.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an electronic expansion valve that the reliability is high, the precision is high, long service life.

The above technical purpose of the present invention can be achieved by the following technical solutions:

the utility model provides an electronic expansion valve, includes shell, disk seat, import pipe, outlet pipe, valve rod, needle, rotor core, magnetic ring and spring, the import pipe is installed on the lateral wall of shell, the outlet pipe is installed in the disk seat bottom, the valve rod is moulded plastics on the boss of disk seat upper end, characterized by: the valve rod comprises a guide hole arranged in the middle, a communication hole arranged on the side wall, a thread section arranged on the upper section and a limiting block arranged at the top end, the valve needle is arranged in the guide hole of the valve rod, the valve needle sequentially comprises an installation section, a stage section, a guide section, a transition section and a flow section from top to bottom, the diameter of the transition section is smaller than that of the guide section, the rotor core consists of two halves, the two halves of the rotor core are buckled on the outer side of the thread section of the valve rod and are mutually matched through a thread structure, a limiting cavity and a compression cavity are formed in the middle of the rotor core, the limiting cavity corresponds to the limiting block of the valve rod in position, a spring in a compression state is installed in the compression cavity, the spring is sleeved on the installation section and is connected with the step section in a jacking mode, the length from the bottom end of the guide section to the step section is smaller than that of the guide, the outer part of the rotor core is sleeved with a magnetic ring, the inner side wall of the magnetic ring is provided with a convex structure, the outer side wall of the rotor core is provided with a corresponding groove, the rotor core and the groove are positioned and transmit torque through the convex structure and the groove, and the shell covers the outer side of the magnetic ring and is fixedly connected with the valve seat.

Preferably, a positioning section is further arranged between the platform section and the guide section, and the diameter of the positioning section is smaller than that of the guide section.

Preferably, the number of the communicating holes is a plurality of, and the communicating holes are uniformly distributed on the side wall of the valve rod, so that the impact of the fluid on the valve needle flow section in a single direction can be reduced, and the flow stabilizing effect is achieved.

To sum up, the utility model discloses following beneficial effect has:

1. the transition section can effectively avoid flash burrs at the bottom of the guide section of the valve rod, so that no friction interference exists during the action of the valve body, and the phenomenon of valve non-action caused by friction falling due to friction during the action of the valve is effectively avoided;

2. the location section is used for installing rotor core direction section, and the rotor core adopts injection moulding, has fixed rotor core and needle direction fit clearance, and the nimble adjustment of the needle of being convenient for and valve rod direction section need not change along with the change in guide clearance between needle and the valve rod, has promoted the commonality of product, has reduced the die sinking expense of rotor core, promotes product preparation cycle.

Drawings

FIG. 1 is a cross-sectional view of the valve stem to outlet tube connection of the present invention;

fig. 2 is a schematic structural diagram of the valve needle of the present invention;

fig. 3 is a schematic view of the valve needle of the present invention installed in the valve stem;

fig. 4 is a schematic view of the overall structure of the present invention;

in the figure, 1, a housing; 2. a valve seat; 3. an inlet pipe; 4. an outlet pipe; 5. a valve stem; 6. a valve needle; 7. a rotor core; 8. a magnetic ring; 9. a spring; 10. a limiting cavity; 11. a compression chamber; 51. a guide hole; 52. a communicating hole; 53. a threaded segment; 54. a limiting block; 61. a guide section; 62. a flow section; 63. a transition section; 64. a stage of stage; 65. mounting section, 66, positioning section.

Detailed Description

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

As shown in fig. 1, 2, 3 and 4, an electronic expansion valve comprises a housing 1, a valve seat 2, an inlet pipe 3, an outlet pipe 4, a valve rod 5, a valve needle 6, a rotor core 7, a magnetic ring 8 and a spring 9, wherein the inlet pipe 3 is installed on the side wall of the housing 1, the outlet pipe 4 is installed at the bottom of the valve seat 2, the valve rod 5 is injection-molded on a boss at the upper end of the valve seat 2, the valve rod 5 comprises a guide hole 51 arranged at the middle part, a communication hole 52 arranged at the side wall, a threaded section 53 arranged at the upper part and a stop block 54 arranged at the top end, the valve needle 6 is installed in the guide hole 51 of the valve rod 5, the valve needle 6 sequentially comprises an installation section 65, a step section 64, a guide section 61, a transition section 63 and a flow section 62 from top to bottom, the diameter of the transition section 63 is smaller than that of the guide section 61, the rotor core 7 is composed of two halves, the rotor core 7 is, a limiting cavity 10 and a compression cavity 11 are formed in the middle of the rotor core 7, the limiting cavity 10 corresponds to a limiting block of the valve rod 5, a spring 9 in a compression state is installed in the compression cavity 11, the spring 9 is sleeved on the installation section 65 and is connected with the stage 64 in a jacking mode, the length from the bottom end of the guide section 61 to the stage section 64 is smaller than that of the guide hole 51, the length of the transition section 63 is larger than the stroke distance from the full closing to the full opening of the valve, the valve is guaranteed to be in a moving process, burr edges of the boundary between the guide hole 51 and the communication hole 52 are always located in the region of the transition section 63, the rotor core 7 is sleeved with the magnetic ring 8, a convex structure is arranged on the inner side wall of the magnetic ring 8, a corresponding groove is arranged on the outer side wall of the rotor core 7, the convex structure and the groove are used for positioning and transmitting torque.

Preferably, a positioning section 66 is further arranged between the stage 64 and the guide section 61, the diameter of the positioning section 66 is smaller than that of the guide section 61, the positioning section 66 is used for installing the guide section of the rotor core 7, the rotor core 7 is processed by injection molding, a guide fit clearance between the rotor core 7 and the valve needle 6 is fixed, the valve needle 6 and the guide section 61 of the valve rod 5 can be flexibly adjusted conveniently, the change of the guide clearance between the valve needle 6 and the valve rod 5 is not needed, the universality of a product is improved, the mold opening cost of the rotor core is reduced, and the product manufacturing period is prolonged.

Preferably, the number of the communication holes 52 is multiple, the communication holes are uniformly distributed on the side wall of the valve rod 5, and the communication holes 52 are uniformly distributed, so that the impact of the fluid on the flow section of the valve needle 6 in one direction can be reduced, and a flow stabilizing effect is achieved.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. The utility model provides an electronic expansion valve, includes shell (1), disk seat (2), import pipe (3), outlet pipe (4), valve rod (5), needle (6), rotor core (7), magnetic ring (8) and spring (9), import pipe (3) are installed on the lateral wall of shell (1), outlet pipe (4) are installed in disk seat (2) bottom, valve rod (5) are moulded plastics on the boss of disk seat (2) upper end, characterized by: the valve rod (5) comprises a guide hole (51) arranged in the middle, a communication hole (52) arranged on the side wall, a thread section (53) arranged on the upper section and a limiting block (54) arranged on the top end, the valve needle (6) is installed in the guide hole (51) of the valve rod (5), the valve needle (6) sequentially comprises an installation section (65), a table stage (64), a guide section (61), a transition section (63) and a flow section (62) from top to bottom, the diameter of the transition section (63) is smaller than that of the guide section (61), the rotor core (7) is composed of two halves, the two halves of the rotor core (7) are buckled on the outer side of the thread section (53) of the valve rod (5) and are mutually matched through a thread structure, a limiting cavity (10) and a compression cavity (11) are formed in the middle of the rotor core (7), the limiting cavity (10) corresponds to the limiting block of the valve rod (5), and a spring (9) in a compression state is installed in, the spring (9) is sleeved on the installation section (65) and is connected with the platform stage (64) in a jacking mode, the length from the bottom end of the guide section (61) to the platform stage (64) is smaller than the length of the guide hole (51), the length of the transition section (63) is larger than the stroke distance from the full closing of the valve to the full opening, a magnetic ring (8) is sleeved outside the rotor core (7), a protruding structure is arranged on the inner side wall of the magnetic ring (8), a corresponding groove is formed in the outer side wall of the rotor core (7), the rotor core and the groove are positioned and transmit torque through the protruding structure and the groove, and the shell (1) covers the outer side of the magnetic ring (8) and is fixedly connected with the valve seat (2.

2. An electronic expansion valve according to claim 1, wherein: a positioning section (66) is further arranged between the table section (64) and the guide section (61), and the diameter of the positioning section (66) is smaller than that of the guide section (61).

3. An electronic expansion valve according to claim 1, wherein: the number of the communication holes (52) is multiple, and the communication holes are uniformly distributed on the side wall of the valve rod (5).