CN113669475A

CN113669475A - Electric valve

Info

Publication number: CN113669475A
Application number: CN202110823875.1A
Authority: CN
Inventors: 陈华军; 何孝水; 陈雨龙
Original assignee: Zhuji Yiba Electronic Valve Co ltd
Current assignee: Zhuji Yiba Electronic Valve Co ltd
Priority date: 2021-07-21
Filing date: 2021-07-21
Publication date: 2021-11-19
Anticipated expiration: 2041-07-21
Also published as: CN113669475B

Abstract

The invention discloses an electric valve which comprises a motor stator, a valve body assembly, an execution assembly and an axial limiting device, wherein the valve body assembly comprises a valve seat and an isolation sleeve, and the isolation sleeve is fixed on the valve seat; the executing assembly comprises a screw rod, a magnetic rotor and a bearing valve core, the screw rod is fixed at the top in the isolating sleeve, the center of the magnetic rotor is provided with an internal thread section matched with the screw rod, and the lower part of the magnetic rotor is connected with the bearing valve core; when a rotating magnetic field generated by the motor stator interacts with a magnetic field generated by the magnetic rotor, and under the transmission action of the screw rod and the internal thread section, the bearing valve core in the valve cavity is driven to move in an up-and-down axial displacement manner, so that the flow is adjusted; and under the action of the axial limiting device, the position control of the bearing valve core is realized. The electric valve has the advantages of high maneuverability, good internal sealing performance, long service life, symmetrical bidirectional flow and the like.

Description

Electric valve

Technical Field

The invention relates to the technical field of fluid control, in particular to an electric valve.

Background

The electric valve is used as an important component forming a refrigerating system and is widely applied to a refrigerating unit, a refrigeration house, a supermarket refrigerator and the like. The electric valve has a main function of realizing the fine adjustment and opening and closing of the flow rate.

At present, the main structure of electric valves at home and abroad is a needle valve structure, and most of torque is lost on threads in the ascending process under the influence of axial pressure of a valve core and system pressure, so that great torque of a motor needs to be consumed, and the maneuverability of the valve is reduced; the valve core is in a cantilever state due to the structure of the valve, so that the valve core is easily abraded in the opening and closing processes of the valve, the internal leakage amount is increased, and the flow control of a refrigerating system is unstable.

To date, the shapes of the valve ports of most electric control valves at home and abroad for regulating flow are not symmetrical, one is basically in a radial direction, and the other is in an axial direction, so that the forward flow characteristic and the reverse flow characteristic are not equal, and the exquisite flow regulation of a system is not facilitated.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an electric valve.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides an electrically operated valve, includes motor stator, valve body subassembly, executive component, axial stop device which characterized in that: the valve body assembly comprises a valve seat and an isolation sleeve, and the isolation sleeve is fixed on the valve seat;

the executing assembly comprises a screw rod, a magnetic rotor and a bearing valve core, the screw rod is fixed at the top in the isolating sleeve, the center of the magnetic rotor is provided with an internal thread section matched with the screw rod, and the lower part of the magnetic rotor is connected with the bearing valve core; a valve cavity matched with the bearing valve core is arranged in the valve seat;

when a rotating magnetic field generated by the motor stator interacts with a magnetic field generated by the magnetic rotor, and under the transmission action of the screw rod and the internal thread section, the bearing valve core in the valve cavity is driven to move in an up-and-down axial displacement manner, so that the flow is adjusted; and simultaneously, under the action of the axial limiting device, the position control of the bearing valve core is realized.

In the above electric valve, the axial limiting device includes a guide spring fixed on the magnetic rotor, a movable spring matched with the guide spring, and a stop rod fixed on the valve seat, and the stop rod is in contact with the movable spring; when the magnetic rotor rotates, the guide spring is fixed, and the opening and closing action and the flow control of the electric valve are realized by the movable spring under the limiting action of the stop rod and the spiral guiding action of the guide spring.

In the above electrically operated valve, the screw rod includes an external thread section matching with the internal thread section of the magnetic rotor, a handle is provided above the external thread section, and the handle is fixed to the center of the top inside the isolation sleeve, so as to prevent the magnetic rotor from radially deviating and colliding with the isolation sleeve.

In the electric valve, the upper end surface of the valve seat is provided with a limiting blind hole matched with the stop rod, and the limiting blind hole is arranged at the periphery of the valve cavity;

in the above electrically operated valve, a first flow valve port and a second flow valve port communicated with the valve cavity are formed on an outer wall of the valve seat, and the first flow valve port and the second flow valve port are symmetrical in position and have the same shape, so that the forward flow characteristic and the reverse flow characteristic are equivalent.

In the above electrically operated valve, a rotating shaft column matched with an inner hole of the guide spring and an inner hole of the movable spring is formed outside the inner thread section of the magnetic rotor, a fixed shaft column matched with the bearing valve core is arranged below the rotating shaft column, a second fixed part matched with the first fixed part of the guide spring is arranged above the fixed shaft column and on the rotating shaft column, magnetic pole parts are formed around the outer side of the rotating shaft column, and a magnetic field generated by the magnetic pole parts can interact with a magnetic field generated when the motor stator is energized.

In the above-mentioned electric valve, the bearing valve core includes a bearing inner sleeve, a rolling part, and a valve core sleeve, the bearing inner sleeve is fixed on the fixed shaft column of the magnetic rotor, and the rolling part is located between the bearing inner sleeve and the valve core sleeve; the outer wall of the valve core sleeve is matched with the inner wall of the valve cavity, and the bearing valve core is used for enabling the bearing inner sleeve to rotate synchronously along with the magnetic rotor, but the valve core sleeve does not rotate along with the magnetic rotor and only moves in an axial displacement mode.

In the above-mentioned electric valve, the height of the valve core sleeve is greater than that of the first flow valve port, so that when the electric valve is in the closed position, the flow of the fluid does not leak.

Compared with the prior art, the invention has the following beneficial effects:

firstly, the first flow valve port and the second flow valve port are symmetrical in position and identical in shape, and bidirectional flow equalization is achieved.

Secondly, by the precise matching of the bearing valve core and the valve cavity in the valve seat, on one hand, the bearing valve core is always positioned in the valve cavity under the action of the axial limiting device, and the bearing valve core cannot shake under the action of fluid to be abraded; on the other hand, the motor-operated valve does not leak in the closed state.

Finally, by matching the outer wall of the valve core sleeve with the inner wall of the valve cavity, when the electric valve is in a closed state, when a first flow valve port or a second flow valve port in fluid enters, and in the rising process, the valve core sleeve generates downward linear sliding friction under the action of the lateral pressure of the fluid on the valve core sleeve; therefore, the sliding friction force is overcome, large motor torque is not needed, and the maneuverability of the electric valve is further improved.

Drawings

The invention is further described with reference to the accompanying drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of an axial stop device according to the present invention;

FIG. 3 is a schematic view of the valve seat of the present invention;

FIG. 4 is a schematic cross-sectional view of a valve seat according to the present invention;

FIG. 5 is a schematic structural view of a lead screw according to the present invention;

FIG. 6 is a schematic view of a magnetic rotor according to the present invention;

FIG. 7 is a schematic structural view of a bearing cartridge according to the present invention;

FIG. 8 is a schematic view of the guide spring of the present invention;

in the figure, 1 — the motor stator; 2-valve seat, 21-valve cavity, 22-limit blind hole, 23-first flow valve port, 24-second flow valve port; 3-isolating the sleeve; 4-screw rod, 41-external thread section, 42-handle; 5-magnetic rotor, 51-internal thread section, 52-rotating shaft column, 53-fixed shaft column, 54-second fixed part and 55-magnetic pole part; 6-bearing valve core, 61-bearing inner sleeve, 62-rolling part, 63-valve core sleeve; 7-guide spring, 71-first fixed part, 72-lower stop part, 73-spiral guide groove, 74-upper stop part; 8-a movable spring; 9-stop lever.

Detailed Description

The technical scheme of the invention is further specifically described by the following embodiments.

With reference to fig. 1, an electrically operated valve includes a motor stator 1, a valve body assembly, an actuating assembly, and an axial limiting device, and is characterized in that:

the valve body assembly comprises a valve seat 2 and an isolation sleeve 3, wherein the isolation sleeve 3 is fixed on the valve seat 2;

the executing assembly comprises a screw rod 4, a magnetic rotor 5 and a bearing valve core 6, wherein the screw rod 4 is fixed at the top in the isolation sleeve 3, an internal thread section 51 matched with the screw rod 3 is arranged at the center of the magnetic rotor 5, and the lower part of the magnetic rotor 5 is connected with the bearing valve core 6; a valve cavity 21 matched with the bearing valve core 6 is arranged in the valve seat 2;

when a rotating magnetic field generated by the motor stator 1 interacts with a magnetic field generated by the magnetic rotor 5, and under the transmission action of the screw rod 3 and the internal thread section 51, the bearing valve core 6 in the valve cavity 21 is driven to do vertical axial displacement motion, so that the flow is adjusted; meanwhile, under the action of the axial limiting device, the position of the bearing valve core 6 is controlled.

The axial stop device of the present invention is further specifically described with reference to fig. 2 to 8, as follows:

the axial limiting device comprises a guide spring 7 fixed on the magnetic rotor 5, a movable spring 8 matched with the guide spring 7 and a stop rod 9 fixed on the valve seat 2; when the magnetic rotor 5 rotates, the stop rod 9 contacts with the movable spring 8;

when the magnetic rotor 5 rotates, the guide spring 7 is fixed on the magnetic rotor 5 and rotates along with the magnetic rotor 5, and the movable spring 8 realizes the opening and closing action and the flow rate control of the electric valve under the limiting action of the stop rod 9 and the spiral guiding action of the guide spring 8.

The opening and closing states of the electric valve will be explained in further detail: when the movable spring 8 is at the lower stop part of the guide spring 7, the axial valve core 6 is positioned above the first flow valve port 23 and the second flow valve port 24, and the electric valve is in a fully open state; when the movable spring 8 is at the top stop position of the guide spring 7, the axial spool 6 is positioned below the first flow port 23 and the second flow port 24, the axial spool completely blocks the first flow port 23 and the second flow port 24, and the electric valve is in a completely closed state.

The flow regulating function of the electric valve is explained in further detail: when the position of the movable spring 8 is between the lower stop portion and the upper stop portion of the guide spring 7, the position of the bearing valve body 6 changes with the position of the magnetic rotor 5, and the flow area changes accordingly, thereby realizing the flow rate regulation function.

The valve seat 2 of the present invention is further specifically described with reference to fig. 3 and 4, as follows:

wherein, the upper end face of the valve seat 2 is provided with a limit blind hole 22 matched with the stop rod 9, and the limit blind hole 22 is arranged at the periphery of the valve cavity 21;

wherein, the outer wall of the valve seat 2 is provided with a first flow valve port 23 and a second flow valve port 24 which are communicated with the valve cavity 21, and the first flow valve port 23 and the second flow valve port 24 are symmetrical in position and have the same shape.

Through the symmetrical arrangement and the same shape of the two flow valve ports, the two-way flow equality is realized, and the flow characteristic curves are the same, so that the control program design of the refrigerating system unit is facilitated.

Referring to fig. 5, the screw 4 of the actuator assembly of the present invention is further specifically described as follows:

the screw rod 4 comprises an external thread section 41 matched with an internal thread section 51 of the magnetic rotor 5, a handle part 42 is arranged above the external thread section 41, and the handle part 42 is fixed with the center of the inner top of the isolation sleeve 3. In the invention, the fixing mode of the screw rod 4 and the isolation sleeve 3 is preferably selected; and (4) resistance welding.

Referring to fig. 6, the magnetic rotor 5 of the actuator assembly of the present invention will be further specifically described as follows:

wherein, the external part of the internal thread section 51 of the magnetic rotor 5 forms a rotating shaft column 52 matched with the inner hole of the guide spring 7 and the inner hole of the movable spring 8, a fixed shaft column 53 matched with the bearing valve core 6 is arranged below the rotating shaft column 52, a second fixed part 54 matched with a first fixed part 71 of the guide spring 7 is arranged above the fixed shaft column 53 and on the rotating shaft column 51, a magnetic pole part 55 is formed on the periphery of the outer side of the rotating shaft column 52, and a magnetic field generated by the magnetic pole part 55 can interact with a magnetic field generated when the motor stator 1 is electrified.

Referring to fig. 7, the bearing cartridge 6 of the actuator assembly of the present invention will be further described in detail as follows:

the bearing valve core 6 comprises a bearing inner sleeve 61, a rolling part 62 and a valve core sleeve 63,

wherein, the bearing inner sleeve 61 is fixed on the fixed shaft column 53 of the magnetic rotor 5, and the rolling part 62 is positioned between the bearing inner sleeve 61 and the valve core sleeve 63; the outer wall of the valve core sleeve 63 is matched with the inner wall of the valve cavity 21; in the present invention, the valve body case 63 can be elastically deformed under fluid pressure and can be restored to its original shape without being affected by the pressure.

The rolling part 62 is preferably a ball, which is beneficial to further reducing radial friction resistance and improving the maneuverability of the electric valve;

the height of the valve core sleeve 63 is greater than that of the first flow valve port 23, so that on one hand, when the electric valve is in a closed position, the flow of fluid is not leaked, and on the other hand, the valve core sleeve 63 is always in the valve cavity 21 and always precisely matched with the valve cavity 21, so that the valve core sleeve 63 is not easy to wear, the service life of the electric valve is prolonged, and the flow control of the refrigeration system is stable.

The transmission function of the electric valve is realized according to the detailed description of the external thread section 41 of the screw rod 4 and the internal thread section 51 of the magnetic rotor 5.

From the above detailed description, it is further detailed how the motorized valve of the present invention improves its maneuverability:

in the invention, the surfaces of the valve cavity 21 and the bearing valve core 6 are both subjected to surface finish treatment;

by matching the outer wall of the bearing valve core 6 with the inner wall of the valve cavity 21, when the electric valve is in a closed state, when the first flow valve port 23 or the second flow valve port 24 in fluid enters, in an opening process, the magnetic rotor 5 drives the bearing inner sleeve 61 to synchronously rotate, and the valve core sleeve 63 does not rotate along with the magnetic rotor 5 under the action of the rolling part 62 and only does axial displacement motion; the spool sleeve 63 generates downward sliding friction under the action of lateral pressure of fluid on the spool sleeve 63; during the transmission process, the influence of the fluid pressure on the threads is eliminated. Therefore, the sliding friction force is overcome, the large motor torque does not need to be consumed, and the maneuverability of the electric valve is further improved.

The above embodiments are only for illustrating the technical idea and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.

Claims

1. The utility model provides an electrically operated valve, includes motor stator (1), valve body subassembly, executive component, axial stop device, its characterized in that: the valve body assembly comprises a valve seat (2) and an isolation sleeve (3), and the isolation sleeve (3) is fixed on the valve seat (2);

the executing assembly comprises a screw rod (4), a magnetic rotor (5) and a bearing valve core (6), the screw rod (4) is fixed at the top in the isolating sleeve (3), an internal thread section (51) matched with the screw rod (4) is arranged at the center of the magnetic rotor (5), and the lower part of the magnetic rotor (5) is connected with the bearing valve core (6); a valve cavity (21) matched with the bearing valve core (6) is arranged in the valve seat (2);

when a rotating magnetic field generated by the motor stator (1) interacts with a magnetic field generated by the magnetic rotor (5), and under the transmission action of the screw rod (4) and the internal thread section (51), the bearing valve core (6) in the valve cavity (21) is driven to move in an up-and-down axial displacement manner, so that the flow is adjusted; and simultaneously, under the action of the axial limiting device, the position of the bearing valve core (6) is controlled.

2. An electrically operated valve according to claim 1, wherein: the axial limiting device comprises a guide spring (7) fixed on the magnetic rotor (5), a movable spring (8) matched with the guide spring (7), and a stop rod (9) fixed on the valve seat (2), wherein the stop rod (9) is in contact with the movable spring (8).

3. An electrically operated valve according to claim 1, wherein: the screw rod (4) comprises an external thread section (41) matched with an internal thread section (51) of the magnetic rotor (5), a handle part (42) is arranged above the external thread section (41), and the handle part (42) is fixed with the center of the inner top of the isolation sleeve (3).

4. An electrically operated valve according to claim 1 or 2, characterised in that: the upper end face of the valve seat (2) is provided with a limiting blind hole (22) matched with the stop rod (9), and the limiting blind hole (22) is arranged on the periphery of the valve cavity (21); the outer wall of the valve seat (2) is provided with a first flow valve port (23) and a second flow valve port (24) which are communicated with the valve cavity (21), and the first flow valve port (23) and the second flow valve port (24) are symmetrical in position and identical in shape.

5. An electrically operated valve according to any one of claims 1 to 3, wherein: the outside of the internal thread section (51) of the magnetic rotor (5) forms a rotating shaft column (52) matched with the inner hole of the guide spring (7) and the inner hole of the movable spring (8), a fixed shaft column (53) matched with the bearing valve core (6) is arranged below the rotating shaft column (52), a second fixed part (54) matched with a first fixed part (71) of the guide spring (7) is arranged above the fixed shaft column (53) and on the rotating shaft column (52), magnetic pole parts (55) are formed around the outer side of the rotating shaft column (52), and the magnetic field generated by the magnetic pole parts (55) and the magnetic field generated when the motor stator (1) is electrified can interact.

6. An electrically operated valve according to claim 1 or 5, characterised in that: the bearing valve core (6) comprises a bearing inner sleeve (61), a rolling part (62) and a valve core sleeve (63), the bearing inner sleeve (61) is fixed on a fixed shaft column (53) of the magnetic rotor (5), and the rolling part (62) is positioned between the bearing inner sleeve (61) and the valve core sleeve (63); the outer wall of the valve core sleeve (63) is matched with the inner wall of the valve cavity (21).

7. An electrically operated valve according to claim 6, wherein: the height of the valve core sleeve (63) is greater than that of the first flow valve port (23).