JP7321374B2 - Nut seat structure of electronic expansion valve and its mounting method - Google Patents

Description

The present application is titled "Electronic expansion valve nut seat structure and mounting method thereof", filed on March 3, 2020, and filed with application number 202010145451. Claiming priority of an earlier filed application that is X.

TECHNICAL FIELD The present invention relates to the technical field of valve equipment, and more particularly to a nut seat structure for an electronic expansion valve and a mounting method thereof.

With the spread of inverter air conditioners, electronic expansion valves have become the main device of inverter air conditioners, and their performance has a great impact on the comfort and energy efficiency of air conditioners. Referring to FIG. 5, the electronic expansion valve is usually provided with a stopper 01', a magnetic rotor 02', a screw 03', a nut seat 04', a valve seat 05', etc. In the prior art, the nut seat of the conventional structure is Metal (powder metallurgy) material is directly used for processing, so the amount of turning is large, it takes time and labor, and the processing quality of the internal thread is unstable, which directly affects the product quality and the processing cost is high. .

The main purpose of the present invention is to solve the problems of the prior art that the processing cost of the nut seat of the electronic expansion valve is too high and the quality of the thread is unstable, so as to provide a nut seat structure and a It is to provide the mounting method.

To achieve the above objectives, one aspect of the present invention provides a nut seat structure for an electronic expansion valve including a valve seat and a spindle. The nut seat structure of the electronic expansion valve is a nut seat inserted into the valve seat, made of engineering plastic, and positioned between the nut seat and the valve seat, the outer wall being the valve seat. an insert member engaged with an interference fit and having a hardness greater than the hardness of the nut seat.

Further, the insert member is a telescopic member fitted to the outside of the nut seat.

Further, the valve seat is fitted to the bottom of the nut seat.

Further, the valve seat is made of a first metal, the insert member is made of a second metal, and the hardness of the insert member is higher than the hardness of the valve seat.

Furthermore, the insert is injection molded into the outer wall of the nut seat.

Further, the inner wall of the telescoping member is threaded.

Further, the inner wall of the telescopic member is provided with an annular recess coaxially with the telescopic member.

Further, the inner wall of the telescopic member is provided with a notch that penetrates at least one end face of the telescopic member.

Further, an annular flange is provided on the top of the valve seat coaxially with the insert member, and the annular flange is bent inward to form a crimped portion.

According to another aspect of the present invention, the electronic expansion valve nut seat structure is the electronic expansion valve nut seat structure described above, wherein the insert member is injection molded outside the nut seat to form a nut assembly; and pressing the nut assembly into the valve seat.

When the technical aspect of the present invention is applied, the nut seat in the nut seat structure of the electronic expansion valve of the present invention is made of engineering plastic, preferably PPS material, which is polyphenylene sulfide, and the nut seat is made of engineering plastic. As a result, injection processing is possible, and the quality of the screw is ensured by the mold. Injection molding is not only efficient, but the quality of the screw is more stable. In order to protect the nut seat from damage during press-fitting, an additional insert with a higher hardness than the nut seat is provided outside the nut seat to protect the integrity of the nut seat and significantly reduce processing costs. At the same time, it also ensures that the processing quality of the internal thread is sufficiently stable to ensure the quality of the product.

The drawings of the specification, which form part of the present application, are used for a further understanding of the invention, and the schematic embodiments of the invention and their description are used to explain the invention, and to illustrate the invention. It does not constitute an improper restriction.

1 schematically shows a cross-sectional view of an embodiment of a nut seat structure for an electronic expansion valve of the present invention; FIG. 1 schematically shows a structural drawing of a first embodiment of an insert member of the present invention; FIG. FIG. 4 schematically shows a structural drawing of a second embodiment of the insert member of the present invention; FIG. 4 schematically shows a structural drawing of a third embodiment of the insert member of the present invention; 1 schematically shows a cross-sectional view of a prior art electronic expansion valve; FIG.

Here, the above drawings include the following reference numerals.
01' stopper, 02' magnetic rotor, 03' screw, 04' nut seat, 05' valve seat, 10 valve seat, 11 annular flange, 20 nut seat, 30 insertion member, 31 screw, 32 annular concave groove, 33 Notch, 40 spindle.

It should be noted that the embodiments and features of the embodiments of the present application can be combined with each other where there is no contradiction. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail together with embodiments with reference to the drawings.

As described in the background art, referring to FIG. 5, the electronic expansion valve is usually provided with a stopper 01', a magnetic rotor 02', a screw 03', a nut seat 04', a valve seat 05', and the like. However, in the prior art, the nut seat of the conventional structure is machined by directly using a metal (powder metallurgy) material. , directly affects the quality of the product, and the processing cost is also high.

To solve the above problems, referring to FIGS. 1 to 4, according to one aspect of the present invention, an electronic expansion valve nut seat structure including a valve seat 10 and a spindle 40 is provided. The nut seat structure of the electronic expansion valve is inserted or inserted into the valve seat 10. The nut seat 20 is made of engineering plastic and the spindle 40 is inserted. an insert member 30 located between and having an outer wall engaged with the valve seat 10 with an interference fit and having a hardness greater than that of the nut seat 20; The nut seat of the nut seat structure of the electronic expansion valve of the present invention is made of engineering plastic, preferably made of PPS, which is polyphenylene sulfide. The mold can ensure the quality of the screw, injection molding is not only efficient, but also the quality of the screw is more stable. In order to protect the nut seat from damage during press fitting, the integrity of the nut seat is protected by further providing an insert member (the hardness of the insert member 30 is higher than that of the nut seat 20) outside the nut seat. , the processing cost is greatly reduced, the processing quality of the internal thread is sufficiently stable, and the quality of the product is ensured.

At the same time, the hole at the bottom of the nut seat made of PPS material serves to guide the spindle, and since PPS has self-lubricating properties, it can reduce the wear between the spindle and the PPS material and avoid locking of the product.

In order to protect the outside of the nut seat in all directions, the insert member 30 in this embodiment is a telescopic member fitted to the outside of the nut seat 20 . In another embodiment, the insert member is elongate and may be plural in number, and the plural elongate insert members are spaced along the circumference of the nut seat.

For convenience of installation and processing, the valve seat 10 in this embodiment is fitted to the bottom of the nut seat 20, and the valve seat in this embodiment is shorter, easier to process and less material than the valve seats in the prior art. further savings.

Specifically, the valve seat 10 in this embodiment is made of a first metal, the insertion member 30 is made of a second metal, and the hardness of the insertion member 30 is higher than that of the valve seat 10 . The second metal insert uses a material harder than the second metal of the valve seat to ensure that it deforms very little or almost no when it is pressed in. Preferably, the first metal is a brass alloy. , allowing for constant deformation and preserving the dimensional stability of the internal insert.

For mounting convenience, the insert 30 in this embodiment is injection molded into the outer wall of the nut seat 20 . First machine a simple metal insert, then PPS material nut and metal insert are injection molded together to form the entire nut seat assembly, and then press together with an interference fit to the valve seat to secure. and biases the metal insert during press fit.

In order to ensure the stability of the connection between the telescopic member and the bottom of the nut seat, in the first embodiment of the telescopic member, the inner wall of the telescopic member in this embodiment is provided with a screw 31, and the telescopic member is injection molded on the nut seat. At this time, the engagement area of the screw may be increased so that the telescopic member is more stably connected to the nut seat.

In order to ensure the connection stability between the telescopic member and the bottom of the nut seat, in the second embodiment of the telescopic member, an annular groove 32 is provided on the inner wall of the telescopic member in this embodiment. is provided coaxially with the telescoping member. When the telescopic member is injection molded into the nut seat, the side wall of the nut seat forms an annular injection projection inside the annular groove, which engages the telescopic member with the nut seat for a more stable connection.

In order to secure connection stability between the insert member and the bottom of the nut seat, the inner wall of the insert member in this embodiment is provided with a notch 33 penetrating at least one end surface of the insert member. When injection molding the telescoping member into the nut seat, the side walls of the nut seat form injection projections within the notches that engage the telescoping member to provide a more stable connection to the nut seat.

In the third embodiment of the telescopic member, an annular groove 32 is provided in the inner wall of the telescopic member in this embodiment, and the annular groove 32 is provided coaxially with the telescopic member. A notch 33 passing through at least one end surface of the insert member is provided in the inner wall of the insert member. is formed with an injection projection to engage the telescopic member with the nut seat for a more stable connection.

In order to further ensure connection stability, an annular flange 11 is provided on the top of the valve seat 10 in this embodiment coaxially with the telescopic member, and the annular flange 11 is bent inwardly. A crimped portion is formed.

According to another aspect of the present invention, the electronic expansion valve nut seat structure is the electronic expansion valve nut seat structure described above, wherein the insert member 30 is injection molded outside the nut seat 20 to form a nut assembly. and pressing the nut assembly into the valve seat 10.

After attaching the nut seat to the valve seat, an annular flange may be used and riveted at the same time to further improve connection reliability.

As can be understood from the above description, the above-described embodiments of the present invention have achieved the following technical effects.

The nut seat of the nut seat structure of the electronic expansion valve of the present invention is made of engineering plastic, preferably made of PPS, which is polyphenylene sulfide. The mold can ensure the quality of the screw, injection molding is not only efficient, but also the quality of the screw is more stable. In order to protect the nut seat from damage during press-fitting, an additional insert member with a higher hardness than the nut seat is provided outside the nut seat to protect the integrity of the nut seat and greatly reduce processing costs. It also ensures that the processing quality of the internal thread is sufficiently stable to ensure the quality of the product.

It should be noted that the above detailed description is exemplary and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with this application. As used herein, singular forms are also intended to include plural forms unless the context clearly dictates otherwise. Further, it should be noted that when the terms "comprise" and/or "comprise" are used herein, the presence of features, procedures, operations, devices, assemblies and/or combinations thereof is noted.

It should be noted that the terms "first", "second", etc. in the specification, claims, and drawings of the present application are used to distinguish similar elements and describe a particular procedure or order. not for The terms so used are interchangeable in appropriate circumstances such that the embodiments of the application described herein may be practiced in other ways than those shown or described herein, for example. One thing should be understood.

Further, the terms "comprising" and "comprising" and any variations thereof are intended to be non-exclusive, e.g., a process, method, system, product or apparatus comprising a sequence of steps or units, explicitly enumerating It need not be limited to those steps or units listed and may include steps or units not explicitly listed or other steps or units specific to these processes, methods, products or devices.

For convenience of description, spatially relative terms are used herein, e.g. The spatial relationship of one device or feature shown in a drawing to another device or feature can be described. Note that spatially relative terms are intended to encompass different orientations during use or operation in addition to the orientation of the device depicted in the drawings.

For example, if a device in a figure is oriented in reverse, it will be described as a device "above another device or structure" or "above another device or structure" followed by "a device or structure above another device or structure". "underneath" or "underneath other devices or structures." Thus, the exemplary term "above" can include both orientations "above" and "below". The device may be positioned in other different ways (rotated 90 degrees or otherwise oriented) and the spatially relative descriptions used herein interpreted accordingly.

The foregoing detailed description refers to the drawings which form a part hereof. In the drawings, similar symbols typically identify similar items, unless context dictates otherwise. The illustrated embodiments described in the detailed specification, drawings, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein. The aspects of the disclosure generally described herein and illustrated in the drawings can be arranged, substituted, combined, divided and designed in a variety of different configurations, all of which are expressly described herein. is easily understood.

This disclosure, in accordance with the specific embodiments described herein, is intended as illustrative of the various aspects rather than as limiting. Various modifications and changes can be made without departing from the spirit and scope of the invention, as will be apparent to those skilled in the art. Functionally equivalent methods and apparatuses within the scope of the present disclosure, in addition to those enumerated herein, will be apparent to those skilled in the art from the foregoing descriptions. It is intended that such modifications and changes fall within the scope of the appended claims. The present disclosure is limited only by the scope of the appended claims and the full scope of equivalents to which such claims are entitled. It will be understood that this disclosure is not limited to particular methods, reagents, compounds, compositions or biological systems, as such may, of course, vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention, and various modifications and alterations of the present invention are possible for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present invention shall all fall within the protection scope of the present invention.

Claims (10)

A nut seat structure for an electronic expansion valve including a valve seat (10) and a spindle (40),
a nut seat (20) inserted into the valve seat (10), made of engineering plastic and into which the spindle (40) is inserted;
an insert member positioned between the nut seat (20) and the valve seat (10), the outer wall of which is engaged with the valve seat (10) with an interference fit, and the hardness of which is higher than that of the nut seat (20); 30) and a nut seat structure for an electronic expansion valve. 2. The nut seat structure of an electronic expansion valve according to claim 1, wherein said insert member (30) is a telescopic member fitted to the outside of said nut seat (20). The nut seat structure of an electronic expansion valve according to claim 1, wherein the valve seat (10) is fitted to the bottom of the nut seat (20). 3. The valve seat (10) of claim 1, wherein the valve seat (10) is made of a first metal and the insert (30) is made of a second metal, the hardness of the insert (30) being higher than the hardness of the valve seat (10). 2. The nut seat structure of the electronic expansion valve according to 1. The nut seat structure of an electronic expansion valve according to claim 1, wherein the insert member (30) is injection molded on the outer wall of the nut seat (20). The nut seat structure of an electronic expansion valve according to claim 2, wherein a thread (31) is provided on the inner wall of said telescopic member. 3. The nut seat structure of an electronic expansion valve according to claim 2, wherein the inner wall of said telescopic member is provided with an annular groove (32) provided coaxially with said telescopic member. A nut seat structure for an electronic expansion valve according to claim 2 or 7, wherein a notch (33) penetrating through at least one end surface of said nest member is provided in the inner wall of said nest member. An annular flange (11) is provided on the top of the valve seat (10) coaxially with the insert member, and the annular flange (11) is bent inward to form a crimped portion. 3. The nut seat structure of the electronic expansion valve according to claim 2. The electronic expansion valve nut seat structure is the electronic expansion valve nut seat structure according to any one of claims 1 to 9,
injection molding said insert (30) to the exterior of said nut seat (20) to form a nut assembly;
pressing said nut assembly into a valve seat (10).

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