CN211288765U

CN211288765U - Screw transmission mechanism and electric valve comprising same

Info

Publication number: CN211288765U
Application number: CN201922303239.7U
Authority: CN
Inventors: 王林炜
Original assignee: Zhejiang Zhongbao Auto Control Component Co ltd
Current assignee: Zhejiang Zhongbao Auto Control Component Co ltd
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2020-08-18
Anticipated expiration: 2029-12-19

Abstract

A screw drive mechanism and electric valve containing the mechanism, the external screw thread part of the electric valve includes external screw thread spare and mount pad, the said external screw thread spare includes step semi-cylinder base and external screw thread pole, the external screw thread pole is fixedly connected to the bottom of the said base, the said mount pad presents the step semi-cylinder shape cooperating with said base; the mounting seat and the lower section part of the base part are matched to form a transmission part which is connected and matched with a rotor of an electric valve, a semi-cylindrical part which is integrally formed with the external thread rod is formed on the axial plane part of the base part, and a semi-circular groove which is matched with the semi-cylindrical part is formed on the mounting seat. The utility model discloses a set up half cylinder portion of taking shape at the external screw member to with half cylinder portion length control close with external screw thread length, can ensure the position accuracy and the intensity that the screw thread was moulded plastics. And the installation coaxiality of the external thread piece and the thread seat can be ensured by arranging the semi-cylindrical boss and the semi-cylindrical groove which are embedded in the convex-concave mode along the axial direction on the installation seat and the external thread piece.

Description

Screw transmission mechanism and electric valve comprising same

Technical Field

The utility model belongs to the technical field of the refrigeration motorised valve, especially with a screw drive mechanism and contain the motorised valve of this mechanism.

Background

The electric valve is mainly applied to a refrigerating or heating system and is linked with a variable frequency compressor in the system by changing the valve port flow area of the electric valve, so that the pressure of a refrigerant of the refrigerating or heating system is controlled. The existing electric valve is usually driven by a stepping motor, and a screw mechanism converts the rotary motion of the motor into linear motion, so that a conical valve core elastically connected with a screw thread is close to or far away from a valve port. In order to ensure the flow regulation precision of the electric valve and the working stability of the electric valve, the manufacturing precision of the threaded structure is very critical, particularly, after the threaded structure is subjected to mold plasticization, the design structure directly influences the manufacturing precision of the threads, and meanwhile, the elastic connection structure of the threads and the valve core is also very important, so that the installation is convenient, and the rotation flexibility between the valve core and the threaded mechanism is also a factor to be considered in important design.

CN202992194U discloses a novel screw transmission mechanism: the rotor core divided into two halves is sleeved in the magnet to form an integral rotary rotor, so that a half thread outlet section matched with the outer threads of the supporting rod, a rotor core moving cavity section wider than the half thread outlet section, a narrower valve needle shaft hole section and a valve needle tail groove section wider than the valve needle shaft hole section can be processed along the axis of the half rotor core, a half mounting hole formed by the half mounting hole is used for placing the supporting rod with an upper limiting table and a lower limiting table at the upper end and the valve needle with a convex shoulder, then the lifting braking of the magnet and the rotor core is realized between the rotating body and the supporting rod through the upper limiting table and the lower limiting table, and the up-and-down stopping is realized without increasing a plurality of parts like the conventional electronic expansion valve, so that the expansion valve has fewer parts, simpler structure and easier assembly. Although the thread transmission mechanism reduces parts and achieves the purpose of simplifying the thread mechanism, the thread manufacturing precision is reduced, particularly, the internal thread is formed by assembling two halves, the assembling precision of the two halves further influences the size precision of the thread, and the sliding friction coefficient of the thread is influenced at the joint of the thread. Meanwhile, the rotor core formed by the two halves is also internally provided with parts such as a supporting rod, a valve core, a spring and the like, so that the assembly is inconvenient, and particularly, the assembly is more difficult under the condition of pretightening force during the assembly of the spring.

SUMMERY OF THE UTILITY MODEL

The problem that the assembly difficulty, the screw thread precision are low to current motorised valve screw drive exist, the utility model aims at providing a screw drive and contain the motorised valve of this mechanism.

Therefore, the utility model adopts the following technical scheme: a thread transmission mechanism comprises an internal thread part and an external thread part, wherein the external thread part is in thread fit transmission connection with the internal thread part; the mounting seat and the lower section part of the base part are matched to form a transmission part which is connected and matched with a rotor of an electric valve, a semi-cylindrical part which is integrally formed with the external thread rod is formed on the axial plane part of the base part, and a semi-circular groove which is matched with the semi-cylindrical part is formed on the mounting seat.

As the supplement and improvement to the technical proposal, the utility model also comprises the following technical characteristics.

The length of the semi-cylindrical part accounts for at least 40% of the sum of the lengths of the semi-cylindrical part and the external thread part, and the length of the semi-cylindrical part is preferably equal to or greater than that of the external thread part.

The external thread rod and the semi-cylindrical part are provided with valve core holes communicated with each other, a valve core is arranged in each valve core hole, the valve core is movably arranged in each valve core hole in a penetrating mode, the top of the semi-cylindrical part is provided with a spring hole communicated with the valve core hole, a spring and a gasket are sequentially arranged in each spring hole from top to bottom, and the valve core is connected with the gasket. The valve core, the gasket and the spring are arranged in the complete round hole, the degree of freedom after assembly is small, subsequent further assembly is facilitated, and the precision is improved.

The top of the spring penetrates out of the spring hole, and the top of the spring is supported by round holes formed by matching semicircular grooves formed in the top of the base and the top of the mounting seat respectively, so that the spring is further guided.

The top of the axial plane of the mounting seat is provided with a spring abutting part protruding in the radial direction, and the top of the base part is provided with an abutting groove matched with the spring abutting part. The spring abutting part abuts against the spring to compress the spring, so that the valve core is pressed, and the valve core and the external thread part form an elastic connection system to enable the valve core to move in a small axial displacement mode and rotate in a circumferential direction.

The periphery of the mounting seat and the upper section of the semi-cylindrical part is provided with a clamp spring groove, and a clamp spring is arranged in the clamp spring groove.

The electric valve is characterized by further comprising the thread transmission mechanism, a transmission part of the external thread part is fixedly connected with the motor rotor, and the bottom of the internal thread part is fixedly connected with the valve seat.

Guide gaps are arranged between the valve core and the external thread piece and between the mounting seat and the vertical core shaft, the guide gaps and the grooves on the external thread piece form a gas-liquid balance channel between an internal cavity formed by the thread transmission mechanism and the valve main cavity, the cavity of the internal thread part is communicated with the valve cavity through the guide gaps, and the pressure of the internal thread cavity is balanced.

The top of the housing is provided with a vertical mandrel, and the spring abutting part is provided with a mandrel guide hole matched with the vertical mandrel. After the housing and the valve seat are assembled, the mandrel guides the mounting seat, and the motor rotor is sleeved outside the mounting seat, so that the vertical mandrel and the thread transmission mechanism jointly form a guide system of the rotor.

The top surface and the outer edge of the top of the internal thread component are provided with first stop parts, the bottom of the mounting seat is suspended downwards and forms a semi-annular cavity, and the top of the semi-annular cavity and the annular wall of the semi-annular cavity are provided with second stop parts which are in one-to-one correspondence with the first stop parts and limit the stroke of the valve core.

The external thread is formed by injection molding through a rotary core-pulling process; namely, a mold core with threads is placed in a mold cavity, and after injection molding, a mold is rotated and pulled out to form external threads. Because the external thread is integrally formed by the mold core, the consistent shape and the precision of the thread are high, and the size is easy to ensure.

The utility model discloses following beneficial effect can be reached: 1. the utility model discloses a set up half cylinder portion of taking shape at the external screw member to with half cylinder portion length control close with external screw thread length, can ensure the position accuracy and the intensity that the screw thread was moulded plastics. And the installation coaxiality of the external thread piece and the thread seat can be ensured by arranging the semi-cylindrical boss and the semi-cylindrical groove which are embedded in the convex-concave mode along the axial direction on the installation seat and the external thread piece. 2. The utility model discloses a motor rotor adopts direction from top to bottom of external screw thread and dabber, ensures that the rotor rotates steadily, and noise, vibration are little, do not set up corresponding extension on the external screw thread spare, avoid external screw thread spare and mount pad contact length overlength, cause the assembly to interfere.

Drawings

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

Fig. 2 is a schematic structural view of the external screw member of the present invention.

Fig. 3 is a schematic sectional structural view of the external screw thread member of the present invention.

Fig. 4 is a schematic structural diagram of the mounting base of the present invention.

Detailed Description

The following detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.

As shown in fig. 1-4, the electric valve screw transmission mechanism of the present invention includes an internal thread component 1 and an external thread component, the external thread component is in transmission connection with the internal thread component through screw-thread fit, the external thread component includes an external thread component 2 and a mounting seat 3, the external thread component 2 includes a stepped semi-cylindrical base portion 15 and an external thread rod 16, the external thread rod 16 is fixedly connected to the bottom of the base portion, and the mounting seat 3 and the base portion 15 are in a mutually-matched stepped semi-cylindrical shape; the mounting seat 3 and the lower section of the base part 15 are matched to form a transmission part connected and matched with the motor rotor 7 of the electric valve, a semi-cylindrical part 17 integrally formed with the external thread rod is formed on the axial plane part of the base part 15, and a semi-circular groove matched with the semi-cylindrical part 17 is formed on the mounting seat 3.

Further preferably, the semi-cylindrical portion 17 has a length equal to or greater than the length of the externally threaded rod 16.

Further preferably, the external thread rod 16 and the semi-cylindrical portion 17 are provided with a valve core hole 18 communicated with each other, the valve core 4 is arranged in the valve core hole, the valve core 4 is movably arranged in the valve core hole in a penetrating manner, the top of the semi-cylindrical portion 17 is provided with a spring hole 19 communicated with the valve core hole, a spring 6 and a gasket 5 are sequentially arranged in the spring hole from top to bottom, and the valve core 4 is connected with the gasket 5.

Further preferably, the top of the spring 6 penetrates through the spring hole, and the top of the spring is supported by a circular hole formed by matching semicircular grooves respectively formed on the top of the base 15 and the top of the mounting seat 3.

Further preferably, the top of the axial plane of the mounting seat 3 is provided with a spring abutting portion 13 protruding in the radial direction, and the top of the base portion 15 is provided with an abutting groove cooperating with the spring abutting portion 13.

Further preferably, the mounting seat 3 and the periphery of the upper section of the semi-cylindrical portion 17 are provided with a snap spring groove, and a snap spring 14 is arranged in the snap spring groove.

The motorised valve includes disk seat 8, case 4, motor rotor 7, screw drive mechanism and housing 9, and housing 9 fixed welding is in the disk seat outer fringe, and the transmission portion and the motor rotor 7 fixed connection of external screw thread part, the bottom and the disk seat 8 fixed connection of internal screw thread part 1. Guide clearances 31 are provided between the valve element 4 and the male screw member 2 and between the mount base 3 and the male screw member 2. The guide gap and the groove on the external screw thread element form a gas-liquid balance channel of an internal cavity formed by the thread transmission mechanism and the valve main cavity 111. The top of the housing 9 is provided with a vertical spindle 10, and the spring abutting part 13 is provided with a spindle guide hole matched with the vertical spindle 10. The top surface and the outer edge of the top part of the internal thread component 1 are provided with first stopping parts 12, the bottom part of the mounting seat 3 downwardly overhangs and forms a semi-annular cavity, and the top part of the semi-annular cavity and the annular wall of the semi-annular cavity are provided with second stopping parts 11 which are in one-to-one correspondence with the first stopping parts 12.

The utility model discloses a screw drive mechanism's external screw thread, internal thread all adopt plastics injection moulding, and are efficient, and part shaping uniformity is good, and can add PTFE emollient in the injection molding material, the running resistance of greatly reduced screw thread, external screw thread and internal thread are whole tooth type, and thread shape, size precision are relatively good, and screw drive mechanism transmission precision is high, and frictional resistance is little.

Claims

1. The utility model provides a screw drive mechanism, includes internal thread part (1) and external thread part, external thread part pass through screw-thread fit transmission with internal thread part and be connected its characterized in that: the external thread component comprises an external thread part (2) and a mounting seat (3), the external thread part (2) comprises a step type semi-cylindrical base part (15) and an external thread rod (16), the external thread rod (16) is fixedly connected to the bottom of the base part, and the mounting seat (3) and the base part (15) are in a mutually matched step type semi-cylindrical shape; the mounting seat (3) is matched with the lower section part of the base part (15) to form a transmission part which is connected and matched with a motor rotor (7) of the electric valve, a semi-cylindrical part (17) which is integrally formed with the external thread rod is formed on the axial plane part of the base part (15), and a semi-circular groove which is matched with the semi-cylindrical part (17) is formed on the mounting seat (3).

2. A screw drive according to claim 1, wherein: the length of the semi-cylindrical part (17) is equal to or greater than the length of the external threaded rod (16).

3. A screw drive according to claim 1 or 2, wherein: the outer thread rod (16) and the semi-cylindrical portion (17) are provided with a valve core hole (18) communicated with each other, a valve core (4) is arranged in the valve core hole, the valve core (4) is movably arranged in the valve core hole in a penetrating mode, the top of the semi-cylindrical portion (17) is provided with a spring hole (19) communicated with the valve core hole, a spring (6) and a gasket (5) are sequentially arranged in the spring hole from top to bottom, and the valve core (4) is connected with the gasket (5).

4. A screw drive according to claim 3, wherein: the top of the spring (6) penetrates through the spring hole, and the top of the spring is supported by round holes formed by matching semicircular grooves respectively formed in the top of the base part (15) and the top of the mounting seat (3).

5. A screw drive according to claim 1 or 4, wherein: the top of the axial plane of the mounting seat (3) is provided with a spring abutting part (13) protruding in the radial direction, and the top of the base part (15) is provided with an abutting groove matched with the spring abutting part (13).

6. A screw drive according to claim 5, wherein: the periphery of the upper section of the mounting seat (3) and the upper section of the semi-cylindrical part (17) is provided with a clamp spring groove, and a clamp spring (14) is arranged in the clamp spring groove.

7. An motorised valve that contains screw drive mechanism, includes valve seat (8), case (4), motor rotor (7) and housing (9), housing (9) fixed welding in the valve seat outer fringe, characterized in that: the electric valve further comprises a screw transmission mechanism according to claim 1, 2, 4 or 6, wherein the transmission part of the external screw thread part is fixedly connected with the motor rotor (7), and the bottom of the internal screw thread part (1) is fixedly connected with the valve seat (8).

8. An electrically operated valve comprising a screw drive according to claim 7, wherein: and guide gaps are arranged between the valve core (4) and the external thread piece (2) and between the mounting seat (3) and the vertical core shaft 10, and the guide gaps and the grooves on the external thread piece form a gas-liquid balance channel between an internal cavity formed by the thread transmission mechanism and the valve main cavity.

9. An electrically operated valve comprising a screw drive according to claim 8, wherein: the top of the housing (9) is provided with a vertical mandrel (10), and a mandrel guide hole matched with the vertical mandrel (10) is formed in the spring abutting part (13).

10. An electrically operated valve comprising a screw drive according to claim 9, wherein: the top surface and the outer edge of the top of the internal thread component (1) are provided with first stopping parts (12), the bottom of the mounting seat (3) downwardly overhangs and forms a semi-annular cavity, and the top of the semi-annular cavity and the annular wall of the semi-annular cavity are provided with second stopping parts (11) which are in one-to-one correspondence with the first stopping parts (12).