CN110805699B

CN110805699B - Electronic expansion valve for refrigerating system

Info

Publication number: CN110805699B
Application number: CN201911158986.4A
Authority: CN
Inventors: 陈松华
Original assignee: Dongtai High Tech Innovation Park Co Ltd
Current assignee: Dongtai High Tech Innovation Park Co Ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2021-07-27
Anticipated expiration: 2039-11-22
Also published as: CN110805699A

Abstract

The invention relates to the field of electronic expansion valve equipment, and discloses an electronic expansion valve for a refrigerating system, which comprises a valve body, wherein the bottom of the valve body and the bottom of the side surface are respectively provided with a valve seat and an inlet pipe, the bottom of an inner cavity of the valve body is provided with a positioning envelope, the bottom of the positioning envelope is movably sleeved with a valve needle body, and the top of the valve needle body is provided with a spring. This an electron inflation for refrigerating system, interlock board through on the lead screw, the plunger pipe, location bearing on piston and the rotor, the holding ring, the design of locating lever, move down the in-process at the lead screw, the piston moves up for the plunger pipe, piston top atmospheric pressure increases, thereby offset the bounce of spring compression, make the corresponding reduction of frictional force between the screw and the screw thread of location big envelope, the degree of wear between lead screw and the screw thread of location big envelope has been reduced, electronic expansion valve's life has been improved, the effectual lead screw that has ensured is in the state of vertical location big envelope all the time, prevent the lead screw jamming.

Description

Electronic expansion valve for refrigerating system

Technical Field

The invention relates to the field of electronic expansion valve equipment, in particular to an electronic expansion valve for a refrigerating system.

Background

The electronic expansion valve controls the voltage or current applied to the expansion valve by utilizing the electric signal generated by the regulated parameter so as to achieve the aim of regulating the liquid supply amount.

The conventional electronic expansion valve operates according to the following principle (see fig. 3): before the electromagnetic coil in the coil shell 9 is electrified, the valve needle body 5 is in a full-open position, after the electromagnetic coil is electrified, under the action of magnetic force, the rotor 10 drives the screw rod 8 to rotate, and under the action of the screw rod 8 and the threads of the positioning envelope 3, the screw rod 8 moves downwards to compress the spring 6, so that the pressure of the valve needle body 5 on the valve seat 2 is increased, the opening degree of the valve needle body 5 is reduced, the flow of refrigerant flowing through the expansion valve is reduced, and on the contrary, the flow of refrigerant flowing through the expansion valve is increased.

However, in the use process of the existing electronic expansion valve, along with the downward movement of the screw rod 8, the compression degree of the spring 6 is increased, the reaction force of the spring 6 on the screw rod 8 is increased, so that the friction force between the screw rod 8 and the threads of the positioning envelope 3 is increased, the threads are easily abraded, the service life of the electronic expansion valve is shortened, and because the rotor 10 and the screw rod 8 move up and down together, the coil inside the coil shell 9 is not moved, along with the downward movement of the screw rod 9, the rotor 10 is far away from the coil, the driving force is small, the required driving force is usually realized by the modes of amplifying the coil, reducing the rotor volume and the like, thereby the volume of the whole structure of the electronic expansion valve is increased, and the use cost is increased.

Disclosure of Invention

The invention provides an electronic expansion valve for a refrigeration system, which has the advantages of long service life and low cost and solves the technical problems in the prior art.

The invention provides the following technical scheme: an electronic expansion valve for a refrigeration system comprises a valve body, wherein a valve seat and an inlet pipe are respectively arranged at the bottom of the valve body and the bottom of the side surface of the valve body, a positioning sealing sleeve is arranged at the bottom of an inner cavity of the valve body, a valve needle body is movably sleeved at the bottom of the positioning sealing sleeve, a spring is arranged at the top of the valve needle body, a sliding plate is fixedly connected to the top of the spring, the top of the sliding plate is in contact with a ball arranged at the bottom end of a screw rod, a coil shell is arranged at the top of the valve body, an electrified coil is arranged inside the coil shell, a rotor is movably sleeved at the top of the inner cavity of the valve body and is positioned at the position of the coil shell, the top and the bottom of the rotor are designed to be opened, the top end of the screw rod extends to the outer part of the top end of the rotor, a linkage plate positioned inside the rotor is fixedly sleeved at the top of the screw rod, four positioning rods are symmetrically and fixedly connected to the top of the positioning ring, and a piston is movably sleeved inside a plunger pipe, the bottom of the inner cavity of the rotor is fixedly sleeved with a positioning ring positioned below the linkage plate, the top of the positioning ring is fixedly connected with four symmetrical positioning rods, and the top ends of the four positioning rods respectively extend into the four plunger pipes and are fixedly connected with the bottoms of the pistons.

Preferably, the top of the inner cavity of the valve body is fixedly sleeved with two positioning bearings, and the rotor is fixedly sleeved in the middle of the two positioning bearings.

Preferably, the outer side of the linkage plate is attached to the inner wall of the rotor, a lubricating film is arranged on the inner wall of the rotor, and the linkage plate is movably sleeved with the positioning rod.

The invention has the following beneficial effects:

according to the electronic expansion for the refrigeration system, through the design of the linkage plate on the screw rod, the plunger tube, the piston, the positioning bearing on the rotor, the positioning ring and the positioning rod, in the downward moving process of the screw rod, the piston moves upwards relative to the plunger tube, the air pressure above the piston is increased, so that the rebound force compressed by the spring is counteracted, the friction force between the screw rod and the threads of the positioning envelope is correspondingly reduced, the abrasion degree between the screw rod and the threads of the positioning envelope is reduced, the service life of the electronic expansion valve is prolonged, the screw rod is effectively ensured to be always in a state of being vertical to the positioning envelope, and the screw rod is prevented from being blocked; and the design is cup jointed through the activity of locating lever and interlock board, when making the lead screw rotate along with the rotor, the rotor can not move down, keep in the center department of coil all the time, make the lead screw move down the drive power of in-process unchangeable, need not to enlarge coil or rotor volume, the cost is saved, simultaneously through the laminating of interlock board and rotor inner wall, make the top and the bottom of lead screw carry on spacingly simultaneously, after the long-term use of lead screw, after the screw thread wearing and tearing between lead screw and the location big envelope, the lead screw still keeps with location big envelope vertically state, effectively prevent lead screw slope and lead to the jamming phenomenon, the life of electronic expansion valve has further been improved.

Drawings

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

FIG. 2 is a schematic view of the rotor of the structure of FIG. 1 in accordance with the present invention;

fig. 3 is a schematic structural diagram of a conventional electronic expansion valve.

In the figure: 1. a valve body; 2. a valve seat; 3. positioning the envelope; 4. an inlet pipe; 5. a valve needle body; 6. a spring; 7. a sliding plate; 8. a screw rod; 801. a linkage plate; 802. a plunger tube; 803. a piston; 9. a coil housing; 10. a rotor; 101. positioning the bearing; 102. a positioning ring; 103. and (5) positioning the rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, an electronic expansion valve for a refrigeration system comprises a valve body 1, a valve seat 2 and an inlet pipe 4 are respectively arranged at the bottom of the valve body 1 and the bottom of the side surface, a positioning envelope 3 is arranged at the bottom of the inner cavity of the valve body 1, a valve needle body 5 is movably sleeved at the bottom of the positioning envelope 3, a spring 6 is arranged at the top of the valve needle body 5, a sliding plate 7 is fixedly connected to the top of the spring 6, the top of the sliding plate 7 contacts with a ball arranged at the bottom end of a screw 8, a coil housing 9 is arranged at the top of the valve body 1, an electrified coil is arranged inside the coil housing 9, a rotor 10 is movably sleeved at the top of the inner cavity of the valve body 1, the rotor 10 is located at the coil housing 9, the top and the bottom of the rotor 10 are designed to be open, the top end of the screw 8 extends to the outside of the top end of the rotor 10, and a linkage plate 801 located inside the rotor 10 is fixedly sleeved at the top end of the screw 8, the top of the positioning ring 102 is symmetrically and fixedly connected with four positioning rods 103, the plunger tube 802 is movably sleeved with a piston 803, the bottom of the inner cavity of the rotor 10 is fixedly sleeved with the positioning ring 102 positioned below the linkage plate 801, the top of the positioning ring 102 is fixedly connected with the four symmetrical positioning rods 103, the top ends of the four positioning rods 103 respectively extend into the four plunger tubes 802 and are fixedly connected with the bottom of the piston 803, in the process that the screw 8 moves downwards, the piston 803 moves upwards relative to the plunger tubes 802, the air pressure above the piston 803 is increased, so that the rebound force compressed by the spring 6 is counteracted, the friction force between the screw 8 and the threads of the positioning envelope 3 is correspondingly reduced, the wear degree between the screw 8 and the threads of the positioning envelope 3 is reduced, the service life of the electronic expansion valve is prolonged, and the screw 8 is effectively ensured to be always in a state vertical to the positioning envelope 3, prevent the lead screw from being blocked.

The top of the inner cavity of the valve body 1 is fixedly sleeved with two positioning bearings 101, and the rotor 10 is fixedly sleeved in the middle of the two positioning bearings 101.

The bottom end of the screw rod 8 is provided with a ball, the ball is in contact with the top of the sliding plate 7, and the point-surface contact of the ball and the sliding plate 7 is utilized, so that when the screw rod 8 props against the sliding plate 7 to move downwards, the friction force required to be overcome by the rotation of the screw rod 8 is correspondingly reduced, the energy consumption is reduced, and the cost is saved.

The outer side of the linkage plate 801 is attached to the inner wall of the rotor 10, and the inner wall of the rotor 10 is provided with a lubricating film, so that when the linkage plate 801 rotates relative to the inner wall of the rotor 10, the overcome friction force is low, and under the condition of low energy consumption, the top end of the lead screw 8 is correspondingly limited, after the lead screw 8 is used for a long time, and after threads between the lead screw 8 and the positioning envelope 3 are worn, the lead screw 8 still keeps a state perpendicular to the positioning envelope 3, the phenomenon of clamping stagnation caused by inclination of the lead screw 8 is effectively prevented, the service life of the electronic expansion valve is further prolonged, the linkage plate 801 is movably sleeved with the positioning rod 103, so that the rotor 10 rotates without moving downwards and always keeps at the center of a coil, the driving force of the lead screw 8 in the downward moving process is unchanged, the volume of the coil or the rotor does not need to be enlarged, and the cost is saved.

When the valve is used, a coil in the coil shell 9 is electrified, so that the rotor 10 in the inner cavity of the valve body 1 rotates to drive the screw rod 8 to rotate, the screw rod 8 and the positioning envelope 3 are in threaded action, the screw rod 8 moves downwards, the screw rod 8 pushes against the sliding plate 7 to move downwards, the spring 6 is compressed, the valve needle body 5 is in contact with the valve seat 2 under the action of the elastic force of the spring 6, flow control is performed through the compression degree of the spring 6, the spring 6 is continuously compressed along with the downward movement of the screw rod 8, the spring 6 is compressed to have upward rebound force on the screw rod 8, the rebound force is increasingly larger, the plunger tube 802 moves downwards along with the screw rod 8, the piston 803 moves upwards relative to the plunger tube 802, the pressure intensity of the inner cavity above the piston in the plunger tube 802 is increased, the screw rod 8 has downward resistance to counteract the rebound force of the spring 6, and the resistance is increased along with the increase of the rebound force of the, the thread friction between the screw rod 8 and the positioning sleeve 3 is small, so that the abrasion degree of the position is reduced, and the service life of the electronic expansion valve is prolonged.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an electronic expansion valve for refrigerating system, includes valve body (1), the bottom of valve body (1) and the bottom of side are equipped with disk seat (2) and admission pipe (4) respectively, and the bottom of valve body (1) inner chamber is equipped with location envelope (3), and the bottom movable sleeve of location envelope (3) is equipped with valve needle body (5), and the top of valve needle body (5) is equipped with spring (6), and the top fixedly connected with sliding plate (7) of spring (6), the ball contact of the top of sliding plate (7) and lead screw (8) bottom setting, and the top contact of ball and sliding plate (7), the top of valve body (1) is equipped with coil shell (9), and the inside of coil shell (9) is equipped with electrical coil, its characterized in that: the top of the inner cavity of the valve body (1) is movably sleeved with a rotor (10), the rotor (10) is positioned at the coil shell (9), the top and the bottom of the rotor (10) are designed to be open, the top end of the screw rod (8) extends to the outside of the top end of the rotor (10), and the top end of the screw rod (8) is fixedly sleeved with a linkage plate (801) positioned in the rotor (10), the outer edge of the top of the linkage plate (801) is symmetrically and fixedly connected with four plunger pipes (802), and the plunger tube (802) is movably sleeved with a piston (803), the bottom of the inner cavity of the rotor (10) is fixedly sleeved with a positioning ring (102) positioned below the linkage plate (801), the top of the positioning ring (102) is symmetrically and fixedly connected with four positioning rods (103), and the top ends of the four positioning rods (103) respectively extend into the four plunger pipes (802) and are fixedly connected with the bottoms of the pistons (803).

2. An electronic expansion valve for a refrigeration system as set forth in claim 1, wherein: the top of the inner cavity of the valve body (1) is fixedly sleeved with two positioning bearings (101), and the rotor (10) is fixedly sleeved in the middle of the two positioning bearings (101).

3. An electronic expansion valve for a refrigeration system as set forth in claim 1, wherein: the outer side of the linkage plate (801) is attached to the inner wall of the rotor (10), the inner wall of the rotor (10) is provided with a lubricating film, and the linkage plate (801) is movably sleeved with the positioning rod (103).