CN111594628A

CN111594628A - Electronic expansion valve

Info

Publication number: CN111594628A
Application number: CN201910127673.6A
Authority: CN
Inventors: 范爱松; 叶方平; 叶南伟; 范志伟; 郭国武
Original assignee: Zhejiang Xinjing Air Conditioning Equipment Co ltd
Current assignee: Zhejiang Xinjing Air Conditioning Equipment Co ltd
Priority date: 2019-02-20
Filing date: 2019-02-20
Publication date: 2020-08-28

Abstract

An electronic expansion valve comprises a valve body, a positioning seat, a valve core seat, a nut component and a valve needle screw rod component, wherein the valve body comprises an inlet channel, an outlet channel and a middle channel communicated with the inlet channel and the outlet channel, a valve core seat component is arranged in the middle channel and comprises a valve port part, a matching part positioned at the upper end of the valve port part and a step part positioned above the matching part, the valve port part is provided with a valve port communicated with the outlet channel and a through hole communicated with the inlet channel, the electronic expansion valve is characterized by further comprising a limiting component, the peripheral wall part of the valve core matching part is further provided with a limiting groove, and the tail end of the limiting component is abutted against the limiting groove so as to realize axial and circumferential limiting on the valve core seat. The invention has the beneficial effects that: the limiting component is arranged to enable the communicating hole in the valve core seat to be aligned with the inlet channel in the valve body, so that resistance is reduced, and noise is reduced.

Description

Electronic expansion valve

Technical Field

The invention relates to the technical field of control valves, in particular to an electronic expansion valve applied to a refrigerant loop (such as an air conditioning system for a vehicle, a battery cooling system and the like) on the vehicle.

Background

At present, the driving mode of the electronic expansion valve is that a controller calculates parameters acquired by a sensor, sends an adjusting instruction to a driving plate, the driving plate outputs an electric signal to the electronic expansion valve, then a coil drives a rotor assembly of the electronic expansion valve, the rotary motion of the rotor is converted into the vertical motion of a valve needle through the transmission of a nut and a screw rod, and the throttle area of a valve port of the electronic expansion valve is adjusted, so that the control of the amount of refrigerant is realized.

In the prior art, the valve core seat and the valve body of the electronic expansion valve are usually in threaded connection, the electronic expansion valve with the structure is convenient to disassemble, but the installation position of the valve seat relative to the valve body is not controllable, the communicating hole in the valve core seat is not aligned with the inlet channel in the valve body, and at the moment, when a refrigerant passes through the valve core seat, the resistance is large, bubbles are easily generated, and therefore noise is generated.

How to reduce the noise of the air conditioning system of the car is a technical problem which is researched and urgently needed to be solved by technicians in the field.

Disclosure of Invention

The invention aims to provide an electronic expansion valve capable of reducing noise.

In order to achieve the purpose, the invention adopts the following technical scheme: an electronic expansion valve comprises a valve body, a positioning seat, a valve core seat, a nut component and a valve needle screw rod component, wherein the valve body comprises an inlet channel, an outlet channel and a middle channel communicated with the inlet channel and the outlet channel, the valve core seat component is arranged in the middle channel and comprises a valve port part, a matching part positioned at the upper end of the valve port part and a step part positioned above the matching part, the valve port part is provided with a valve port communicated with the outlet channel and a through hole communicated with the inlet channel, the electronic expansion valve is characterized by further comprising a limiting component, the peripheral wall part of the valve core matching part is further provided with a limiting groove, and the tail end of the limiting component is abutted against the limiting groove so as to realize axial and circumferential limiting on the valve core seat.

The valve body comprises a third side face, a threaded hole is formed in the third side face and used for fixing the coil assembly, a mounting hole is further formed in the oblique upper portion of the threaded hole and penetrates through the third side face, the limiting part is a limiting pin, and the limiting pin is pressed into the mounting hole to be abutted to the wall portion of the limiting groove.

The valve body is including the third side, the third side is provided with the mounting hole, the mounting hole is including one section screw thread portion at least, spacing part is including handle portion, screw thread portion and supporting part, spacing part screw thread portion and mounting hole screw thread portion screw-thread fit are with fixed coil assembly, supporting part and spacing recess wall portion looks butt.

The limiting grooves are formed in one section of arc-shaped grooves in the peripheral wall of the matching part of the valve core seat, and in the embodiment, the two limiting grooves are symmetrically arranged along the central axis direction of the valve core seat.

The limiting groove is a groove formed on the periphery wall of the valve core seat matching part.

The valve needle screw rod assembly comprises a screw rod and a valve needle driven by the screw rod, the screw rod comprises a large-diameter part, a small-diameter part and a connecting part, the connecting part is of a frustum surface structure, a gasket is arranged between the upper end part of the valve needle and the outer wall of the connecting part of the screw rod, and the gasket is in line contact with the screw rod; the upper end of the valve needle is provided with a blind hole with an upward opening, a reset spring is further arranged in the blind hole so as to facilitate resetting of the screw rod, a steel ball is further arranged at the bottom of the blind hole, the reset spring is arranged between the screw rod and the steel ball, and the reset spring is in line contact with the screw rod.

The nut component comprises a plastic nut and a fixing piece, the fixing piece is of an annular metal plate-shaped structure, the fixing piece comprises an opening and an outer edge which are arranged on the inner periphery, a protrusion is further arranged on the outer peripheral face of the middle of the nut, the protrusion is connected with the opening of the fixing piece in a clamping mode to limit the radial displacement of the nut, and the outer edge of the fixing piece is welded and fixed with the positioning seat.

The nut is characterized in that a guide rail formed by spiral protruding strips is formed on the outer peripheral wall of the upper portion of the nut, and a sliding ring is sleeved on the guide rail and can conduct spiral motion along the guide rail.

Compared with the prior art, the valve core seat has the advantages that the limiting component is arranged, the through hole in the valve core seat is aligned with the inlet channel, resistance is reduced, bubbles are reduced, and noise is reduced.

Drawings

FIG. 1 is a front view of an electronic expansion valve of the present invention;

FIG. 2 is a schematic cross-sectional view of an electronic expansion valve according to the present invention;

FIG. 3 is a perspective view of the valve body of FIG. 2;

FIG. 4 is a cross-sectional view of the valve core carrier, positioning seat, rotor assembly and housing of FIG. 1 assembled together;

FIG. 5 is a schematic structural view of an embodiment of a limiting groove on a valve core seat;

FIG. 6 is a schematic structural view of another embodiment of a retention groove in a valve cartridge seat;

fig. 7 is a front view of yet another embodiment of the electronic expansion valve of the present invention.

FIG. 8 is a schematic view of the spacing member of FIG. 7;

FIG. 9 is a schematic view of the valve needle stem assembly of FIG. 2;

FIG. 10 is a perspective view of the nut;

FIG. 11 is a schematic view of a securing tab.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions are specifically described below with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 6, an electronic expansion valve 100 according to the present invention includes a valve body 1, a positioning seat 2, a valve core seat 3, a magnetic rotor assembly 4 mounted on the positioning seat 2, a valve needle screw assembly 5 fixedly connected to the magnetic rotor assembly 4, a screw rod and a nut assembly 6 in threaded engagement on the upper portion of the valve needle screw assembly 5, a housing 8 covering the periphery of the magnetic rotor assembly 4, and a coil assembly 9 sleeved on the housing 8 and used for driving the rotor.

Referring to fig. 3, the valve body 1 is a substantially rectangular parallelepiped, and includes a first side surface 11 (a right side surface in the illustrated embodiment), a second side surface 12 (a left side surface in the illustrated embodiment) opposite to the first side surface 11, a third side surface 13 (a front side surface in the illustrated embodiment) adjacent to and perpendicular to the first side surface 11 and the second side surface 12, a fourth side surface 14 (a rear side surface in the illustrated embodiment), and an upper surface 15. The valve body 1 comprises an inlet channel 111 penetrating the first side 11, an outlet channel 121 penetrating the second side, and an intermediate channel 151 communicating the inlet channel 111 and the outlet channel 121, the intermediate channel penetrating the upper surface 15 and at least partially receiving the valve core seat 3.

The valve body 1 comprises a threaded hole 131 penetrating through the third side 13, and the threaded hole 131 is used for fixing the coil assembly 9. Referring to fig. 2 and 3, in fig. 2, a mounting hole 132 is further disposed obliquely above the threaded hole 131, the mounting hole 132 penetrates through the third side 13, the threaded hole 131 is used for fixing the coil assembly 9, and the mounting hole 132 is used for mounting the limiting component 7.

As shown in fig. 4, the valve core seat 3 includes a valve mouth portion 31 at the lower end, a fitting portion 32 at the upper end of the valve mouth portion 31, and a stepped portion 33 above the fitting portion, and the stepped portion 33 is configured to be welded and fixed with the positioning seat 2. The valve port 31 is provided with a valve port 311 communicating with the outlet channel 121 and through holes 312 communicating with the inlet channel 111, wherein the through holes 312 are uniformly arranged and radially penetrate through the valve port 31.

The peripheral wall of the fitting portion 32 of the valve seat 3 is further provided with a limiting groove 321 for installing the limiting component 7, and specifically, the limiting component 7 is pressed into contact with the wall of the limiting groove 321 through the installation hole 132 to axially limit and circumferentially limit the valve seat 3. The stopper member in the present embodiment is a stopper pin, and is formed of a metal material stainless steel.

Referring to fig. 5 and 6, as shown in fig. 5, the two limiting grooves 321 are arc-shaped grooves formed on the peripheral wall of the mating portion of the valve core seat, and in this embodiment, the two limiting grooves 321 are symmetrically arranged along the central axis of the valve core seat 3, and the limiting grooves arranged in this way can axially limit the rotation of the valve core seat; further, as shown in fig. 6, the limiting groove is formed on the periphery of the peripheral wall of the matching portion of the valve core seat, and the limiting groove 321 arranged in this way can also axially limit the rotation of the valve core seat, so that the alignment of the through hole 312 of the valve core seat and the inlet channel 111 is ensured, the resistance of refrigerant flowing is reduced, and the noise is effectively reduced.

In the above embodiment, the depth of the limiting groove 321 is not less than the radius of the end of the limiting pin, and the length of the arc-shaped groove of the limiting groove 321 on the valve core seat matching part can be set according to specific situations, and is not limited herein.

Referring to fig. 7, fig. 7 is a schematic structural diagram of another embodiment of the invention in which the limiting member 7 is mounted on the valve body 1, and the difference between this embodiment and the above embodiment is that in this embodiment, the third side 13 does not need to be additionally provided with a threaded hole, only two mounting holes 132 are provided, the mounting holes 132 at least include a section of threaded portion, specifically, as shown in fig. 8, the limiting member 7 includes a handle portion 71, a threaded portion 72, and a support portion 73, the limiting member threaded portion 72 is in threaded engagement with the threaded portion of the mounting holes 132 to fix the coil member 9, and the support portion 73 abuts against the limiting groove 321 to limit the valve core seat 3 in the axial and circumferential directions. In this embodiment, only two mounting holes 132 need to be formed, and no additional screw hole needs to be provided, thereby reducing the number of processing steps and reducing the cost. Likewise, the depth of the stopper groove 321 is not less than the radius of the tip of the support portion 73.

In the illustrated embodiment of the invention, the inlet channel is parallel to the outlet channel. Of course, it will be appreciated that the inlet and outlet passages may be arranged perpendicular to each other, depending on the installation requirements. For example, the outlet passage is designed to vertically extend downward from the communication hole and penetrate through the lower surface of the valve body 100.

Referring to fig. 9, fig. 9 is a schematic structural diagram of a valve needle screw assembly, the valve needle screw assembly 5 includes a screw 51 and a valve needle 52 driven by the screw, the screw 51 includes a large-diameter portion 511, a small-diameter portion 512 and a connecting portion 513, the connecting portion 513 is a frustum structure, the valve needle 52 has a blind hole with an upward opening, the lower end of the valve needle 52 is matched with the valve port 31 to open or close the electronic expansion valve, the upper end of the valve needle is a blind hole with an upward opening, a gasket 521 is disposed between the upper end of the valve needle and an outer wall of the screw connecting portion 513, a return spring is further disposed in the blind hole of the valve needle to facilitate the return of the screw, a steel ball is further disposed at. In this embodiment, since the tapered surface structure is formed between the large diameter portion 511 and the connecting portion 513 of the screw, the washer 521 and the screw 51 must be in line contact, and similarly, the tapered surface structure is formed between the small diameter portion 512 and the lower end surface of the connecting portion 513, and the return spring and the screw must be in line contact, so that the friction force is small when the screw reciprocates up and down, the abrasion between the valve needle 52 and the wall of the valve seat hole is effectively reduced, and the service life of the valve seat is prolonged.

The nut assembly 6 includes a plastic nut 61 and a fixing sheet 62, please refer to fig. 10 and 11, fig. 10 is a perspective view of the nut, fig. 11 is a view of the fixing sheet, the nut 61 is the plastic nut, the fixing sheet 62 is a ring-shaped metal plate structure, the fixing sheet is clamped with a protrusion 612 arranged on the plastic nut through an opening 621 to limit the radial displacement of the nut, the protrusion 612 is formed on the outer circumferential surface of the middle portion of the nut 61, and the outer edge 622 of the fixing sheet is welded and fixed with the positioning seat, so that the nut assembly is fixed on the valve body. As shown in fig. 10, a guide rail 611 formed of a spiral protrusion is formed on an upper outer peripheral wall portion of the nut 61, and a slide ring 63 is fitted over the guide rail 611, so that the slide ring 63 can perform a spiral motion along the guide rail 611. Alternatively, the guide rail 611 is not integrated with the nut 61, that is, the outer circumferential wall of the nut is sleeved with a spring guide, and the arrangement form of the guide rail is not limited as long as the sliding ring movement can be satisfied.

Further, in the above embodiment, the valve core seat 3 and the open end of the intermediate channel 151 are fixed in a sealing manner. A first seal ring 3a is provided between the valve port portion 31 and the intermediate passage 151, and a second seal ring 3b is provided between the fitting portion 32 and the intermediate passage 13. Wherein the through hole 312 corresponds to the inlet channel 111, the first sealing ring 3a is located below the through hole 312, and the second sealing ring 3b is located above the through hole 312. In this arrangement, the first and second sealing rings 3a and 3b seal the valve core seat 3 and the intermediate channel 151, so that fluid flows from the inlet channel to the valve port 311 through the through hole 312, thereby preventing internal leakage of refrigerant.

It should be noted that: the above embodiments are only used for illustrating the present invention and not for limiting the technical solutions described in the present invention, and the expressions of upper, lower, inner, outer, etc. presented herein are only used for clearly illustrating the technical solutions of the present invention, and not for limiting the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention.

Claims

1. An electronic expansion valve comprises a valve body, a positioning seat, a valve core seat, a nut component and a valve needle screw rod component, wherein the valve body comprises an inlet channel, an outlet channel and a middle channel communicated with the inlet channel and the outlet channel, the valve core seat component is arranged in the middle channel and comprises a valve port part, a matching part positioned at the upper end of the valve port part and a step part positioned above the matching part, the valve port part is provided with a valve port communicated with the outlet channel and a through hole communicated with the inlet channel, the electronic expansion valve is characterized by further comprising a limiting component, the peripheral wall part of the valve core matching part is further provided with a limiting groove, and the tail end of the limiting component is abutted against the limiting groove so as to realize axial and circumferential limiting on the valve core seat.

2. The electronic expansion valve according to claim 1, further comprising a coil assembly, wherein the valve body comprises a third side surface, the third side surface is provided with a threaded hole for fixing the coil assembly, a mounting hole is further formed obliquely above the threaded hole, the mounting hole penetrates through the third side surface, the limiting component is a limiting pin, and the limiting pin is pressed into contact with the wall of the limiting groove through the mounting hole.

3. The electronic expansion valve according to claim 1, wherein the valve body comprises a third side surface, the third side surface is provided with a mounting hole, the mounting hole comprises at least one section of threaded portion, the position-limiting component comprises a handle portion, a threaded portion and a supporting portion, the threaded portion of the position-limiting component is in threaded fit with the threaded portion of the mounting hole to fix the coil assembly, and the supporting portion abuts against the wall portion of the position-limiting groove.

4. The electronic expansion valve according to claim 2 or 3, wherein the two limiting grooves are formed in an arc-shaped groove on the peripheral wall of the valve core seat mating part, and are symmetrically arranged along the central axis of the valve core seat.

5. The electronic expansion valve according to claim 2 or 3, wherein the stopper groove is a groove formed around the peripheral wall of the valve cartridge seat fitting portion.

6. The electronic expansion valve according to any one of claims 1-5, wherein the valve needle screw assembly comprises a screw rod and a valve needle driven by the screw rod, the screw rod comprises a large diameter part, a small diameter part and a connecting part, the connecting part is of a frustum surface structure, a gasket is arranged between the upper end part of the valve needle and the outer wall of the connecting part of the screw rod, and the gasket is in line contact with the screw rod; the upper end of the valve needle is provided with a blind hole with an upward opening, a reset spring is further arranged in the blind hole so as to facilitate resetting of the screw rod, a steel ball is further arranged at the bottom of the blind hole, the reset spring is arranged between the screw rod and the steel ball, and the reset spring is in line contact with the screw rod.

7. The electronic expansion valve of claim 6, wherein the nut assembly comprises a plastic nut and a fixing plate, the fixing plate is an annular metal plate-shaped structure, the fixing plate comprises an opening and an outer edge arranged on the inner periphery, a protrusion is further arranged on the outer peripheral surface of the middle portion of the nut, the protrusion is clamped with the opening of the fixing plate to limit the radial displacement of the nut, and the outer edge of the fixing plate is welded and fixed with the positioning seat.

8. The electronic expansion valve according to claim 7, wherein the nut has a guide rail formed of a spiral protrusion formed on an upper outer peripheral wall portion thereof, and a slide ring is fitted thereon, the slide ring being capable of moving spirally along the guide rail.