CN102692105B

CN102692105B - Expansion valve

Info

Publication number: CN102692105B
Application number: CN201110406877.7A
Authority: CN
Inventors: 小林和人; 茂木隆
Original assignee: Fujikoki Corp
Current assignee: Fujikoki Corp
Priority date: 2011-03-22
Filing date: 2011-12-08
Publication date: 2016-06-22
Anticipated expiration: 2031-12-08
Also published as: EP2503267B1; JP5730630B2; JP2012197990A; CN102692105A; EP2503267A2; EP2503267A3

Abstract

The present invention provides a kind of expansion valve, and wherein, dynamical element (100) has the barrier film (130) being clamped between cover unit (110) and load bearing component (120)。The peripheral part of cover unit (110), barrier film (130) and load bearing component (120) is engaged by laser weld。It is set to dissolve, what formed by laser weld, the distance adding 0.2mm～1.0mm the length dimension in portion from the position of the fulcrum that parts (110) and load bearing component (120) clamp of being capped of barrier film (130) to the distance of the periphery of dynamical element (100)。Dynamical element (100) after assembling is inserted in the cylindrical portion (12) on the top being arranged at valve body (10), the caulking part (12a) being processed to form by riveted joint be fixed。Expansion valve according to the present invention, by making dynamical element path realize miniaturization。

Description

Expansion valve

Technical field

The present invention relates to the expansion valve of a kind of temperature-sensitive mechanism built in type for kind of refrigeration cycle。

Background technology

In the past, about the kind of refrigeration cycle that the air-conditioning device etc. being equipped on automobile is used, in order to save installation space and distribution, use the Temp. expansion valve by measuring the temperature-sensitive mechanism built in type being adjusted according to cold-producing medium。

Patent documentation 1 has illustrated this expansion valve that the applicant proposes。

The valve body of expansion valve has the ingress interface importing high-pressure refrigerant and the valve chamber connected with ingress interface。The spherical valve member being disposed in valve chamber is relative to the valve seat of valve chamber opening with valve opening, is operated by the valve rod driven by dynamical element, the aperture of this valve member Yu the throttle passage of valve base chamber is controlled。

Cold-producing medium through valve opening is carried from discharge coupling to vaporizer side。The cold-producing medium returned from vaporizer to compressor side passes through the return path be arranged at valve body。

The top of valve body is equipped with the driving mechanism of the valve member being called dynamical element。

Dynamical element by the cover unit forming pressure-operated room, bear pressure and occur the barrier film of the thin plate of elastic deformation and discoid load bearing component to constitute, three parts are piled up and engage circumferential part by the means such as TIG weld and formed。

Inclosure action gas in the pressure-operated room formed by cover unit and barrier film。In order at pressure-operated room inclosure action gas, arrange hole at the top of cover unit, after this hole inclosure action gas, clog hole by steel ball etc., utilize the means confining pressure operating chamber such as projection welding。

Patent documentation 1: Japanese Unexamined Patent Publication 2008-180475 publication

The advantage of temperature-sensitive mechanism as above built in type Temp. expansion valve is in that to reduce overall dimensions, but, owing to being configured with multiple parts with tightlock status about, therefore it is required that seek further miniaturization。Additionally, also have the advantage that can reduce manufacturing cost by carrying out miniaturization。

Summary of the invention

The present invention makes in view of the foregoing, its object is to provide a kind of by making dynamical element path realize the expansion valve of miniaturization。

In order to achieve the above object, the expansion valve of the present invention has: valve body, this valve body have import the ingress interface of high-pressure refrigerant and connect with ingress interface valve chamber, to the valve opening of valve chamber opening, be formed at the valve seat of the entrance of valve opening, send the discharge coupling of the cold-producing medium passed through from valve opening；Valve member, this valve member and valve seat relatively arrange；Dynamical element, this dynamical element has a pressure-operated room being sealed with action gas, the valve rod that valve member is operated by described action gas-powered, in this expansion valve,

Described dynamical element has the formation cover unit of pressure-operated room, load bearing component and is clipped in the barrier film between described cover unit and described load bearing component, the peripheral part of described cover unit, described barrier film and described load bearing component is engaged by the portion of dissolving that formed by laser weld, and described barrier film by described cover unit and the position of the fulcrum of described load bearing component clamping be from described dissolve portion the most deeply incorporate position leave the position of 0.2mm～1.0mm。

Additionally, in described expansion valve, described valve body has the cylindrical portion inserting dynamical element, described dynamical element is fixed by the top of described cylindrical portion carries out riveted joint processing。

Invention effect:

The expansion valve of the present invention is by having above unit, it is possible to make dynamical element path realize miniaturization。

Accompanying drawing explanation

Fig. 1 is sectional view and the right side view of an embodiment of expansion valve of the present invention。

Fig. 2 is the major part enlarged drawing of Fig. 1。

Fig. 3 indicates that the explanation figure of the welding structure of the dynamical element of the present invention。

Fig. 4 indicates that the explanation figure of the heated effluent field to barrier film produced by the welding structure of Fig. 3。

Fig. 5 indicates that the explanation figure of the present invention and the difference of the welding structure of the dynamical element of prior art。

Fig. 6 is sectional view and the right side view of the another embodiment of expansion valve of the present invention。

Reference numeral illustrates:

10 ... valve body；12 ... cylindrical portion；12a ... caulking part；20 ... ingress interface；22 ... diameter holes；24 ... valve chamber；25 ... valve seat；26 ... valve opening；28 ... discharge coupling；30 ... return path；40 ... valve member；42 ... support parts；44 ... helical spring；50 ... stopper；52 ... threaded portion；53 ... hexagon ring；54 ... seal member；60 ... valve rod；62 ... limiting component；64 ... seal member；66 ... spring members；70 ... through hole；80 ... screwed hole；100 ... dynamical element；110 ... cover unit；120 ... load bearing component；130 ... barrier film。

Detailed description of the invention

Fig. 1 represents sectional view (a) and the right side view (b) of the expansion valve of the present invention。

The valve body 10 of the expansion valve of the present invention is a kind of parts blank being applied machining and produce, and described blank is made by carrying out extruded to aluminium alloy, and this valve body 10 has the ingress interface 20 importing high-pressure refrigerant。

The backing of ingress interface 20 is provided with diameter holes 22, and connects with the valve chamber 24 on the length direction of valve body 10 with central shaft。The discharge coupling 28 of the valve chamber 24 valve opening 26 and cold-producing medium by being formed as coaxial connects。

Being formed with valve seat 25 between valve chamber 24 and valve opening 26, the spherical valve member 40 being disposed in valve chamber 24 is relative with valve seat 25。

Valve member 40 supported member 42 supports, and supports parts 42 and is supported by the stopper 50 of the peristome closing valve chamber 24 by helical spring 44。Stopper 50 is screwed by the peristome of threaded portion 52 with the valve chamber 24 of valve body 10。Because stopper 50 can make spanner be inserted into hexagon ring 53 with the end and rotate, thus it is possible to by the screw-in amount adjusting stopper 50, the elastic force of the helical spring 44 supporting valve member 40 is adjusted。

Peripheral part at stopper 50 is provided with seal member 54, thus seal valve chamber 24。

The cold-producing medium sent from discharge coupling 28 is sent to vaporizer, carries out heat exchange with extraneous gas and evaporates。The cold-producing medium returning to compressor side from vaporizer passes through the return path 30 be arranged at valve body 10。

Utilizing caulking part 12a to be provided with dynamical element 100 at the top of valve body 10, this caulking part 12a is formed by the top of the cylindrical portion 12 on the top being formed at valve body 10 carries out riveted joint processing。Seal member 64 it is equipped with between dynamical element 100 and valve body 10。

Dynamical element 100 is produced according to mode described later, and it is made up of cover unit 110, the load bearing component 120 of ring-type and the barrier film 130 that is clipped between cover unit 110 and load bearing component 120。

In the pressure-operated room 112 being made up of cover unit 110 and barrier film 130, inclosure action gas, is closed by key 114。Lower surface at barrier film 130 is equipped with limiting component 62, and the valve rod 60 that is moved through of limiting component 62 passes to valve member 40。Peripheral part at valve rod 60 is equipped with spring members 66, prevents the vibration of valve member 40 by valve rod 60 is applied resistance to sliding。

Valve body 10 offers two through holes 70 of through valve body 10, is used as the insertion hole of the bolt being installed on miscellaneous part by valve body 10。Additionally, the central part at valve body 10 is also formed with a screwed hole 80 with the end。

Fig. 2 is the sectional view of dynamical element 100。

In dynamical element 100, cover unit 110, barrier film 130 and load bearing component 120 are piled up, by welding means, weld part W, implementation unit are formed for peripheral part。The central part of cover unit 110 is formed as protuberance, is provided with hole 116 at its top。From this hole 116 to injection action gas in the pressure-operated room 112 marked off between this hole 116 and dividing plate 130, clog hole 116 with key 114, closed by welding etc.。

In order to realize the miniaturization of expansion valve, in addition it is also necessary to reduce the outside dimension D of dynamical element 100。

Fig. 3 (a) represents the situation being formed weld part W1 by TIG weld。With the length dimension L1 in the portion that dissolves of the weld part W1 formed by TIG weld, the lap of cover unit 110, barrier film 130 and load bearing component 120 is produced heated effluent field H1。Because the heat that TIG weld puts into when being formed and dissolving portion W1 is more, so heated effluent field H1 also can become big。In this range, barrier film 130 is also annealed, and the characteristic as barrier film reduces。

In order to make dynamical element 100 play the performance of regulation, therefore, to assure that the effective diameter D5 inside barrier film fulcrum P1。

In the structure being formed weld part W1 by TIG weld shown in Fig. 3 (a), in order to ensure the effective diameter D5 of this barrier film 130, it is necessary to increase the outside dimension D1 of dynamical element 100。

Fig. 3 (b) represents the situation being dissolved portion W2 by laser weld formation。In laser dissolves, dissolve the portion W2 inner side being formed at the end face of cover unit 110 and load bearing component 120 with length dimension L2。

Additionally, dissolve portion W2 for being formed, less heat is only needed to complete。Therefore, heated effluent field H2 also can diminish。

Utilize the characteristic that this laser dissolves, the effective diameter D5 of barrier film 130 can either be guaranteed, the outside dimension D2 of dynamical element 100 can be reduced again。

Fig. 4 indicates that when the peripheral part to dynamical element 100 carries out TIG weld and barrier film 130 is bestowed during laser weld the explanation figure of scope of heat affecting。

In TIG weld, in the scope from the about 1.0mm by the length dimension that the portion W of dissolving incorporates, bestow the impact of annealing to barrier film 130, and in laser weld, can complete at below 1.0mm, confirm to be reduced to about 0.2mm by testing。

Utilize the above-mentioned characteristic produced by laser weld, as shown in Fig. 3 (b), it is set as on the length dimension L2 of the portion that dissolves W2 being dissolved formation by laser plus the distance of 0.2mm～1.0mm from the position of the fulcrum P1 of barrier film 130 to the distance size S1 of the periphery of dynamical element 100。Additionally, the half of the difference of the effective diameter dimension D 5 of the outside dimension D2 that this distance S1 is dynamical element 100 and barrier film 130。Additionally, in order to avoid heat affecting and reduce the outside dimension of dynamical element 100 as far as possible, the distance being added on L2 is preferably about 0.5 ± 0.2mm。

As it has been described above, the present invention is able to ensure that the effective diameter size of barrier film 130 and reduces the outside dimension of dynamical element 100。

Fig. 5 (a) expression welding gun T1 forms the situation dissolving portion W1 by TIG weld。

Illustrating in Fig. 3 (a), in order to ensure the effective diameter D5 of barrier film 130, the outside dimension D1 of required dynamical element 100 can become big。

Fig. 5 (b) expression forms, by the laser beam B 1 penetrated by laser welding gun T2, the situation dissolving portion W2。

Illustrating in Fig. 3 (b), it is possible to reduce the outside dimension D2 of required dynamical element 100 and guarantee the effective diameter D5 of barrier film 130。

This dynamical element 100 is inserted in the cylindrical portion 12 on the top being formed at valve body 10, is fixed with caulking part 12a, it is hereby achieved that small-sized expansion valve。

When the expansion valve of this riveted joint structure, the external diameter on expansion valve top is the size of the thickness on the external diameter of dynamical element 100 plus the caulking part 12a of 2 times。When conventional when being formed dynamical element by TIG weld, because outside dimension is relatively big, so there is the problem being difficult to adopt this riveted joint structure, but, in accordance with the invention it is possible to reduce the diameter of dynamical element 100, it is thus susceptible to adopt riveted joint structure。Therefore, there is no need to for dynamical element 100 spiral shell is installed to the screw thread process on valve body 10, it is possible to reduce manufacturing cost。

In addition, it is configured in the present embodiment: valve rod 60 is contacted with barrier film 130 by limiting component 62, load bearing component 120 be ring-type and within it perimembranous and limiting component 62 peripheral part between be formed with gap, by making limiting component 62 contact, with valve body 10, the movement limited to valve opening position。

In conventional expansion valve, as shown in Figure 6, by making limiting component 62 contact, with load bearing component 120, the movement limited to valve opening position, in contrast to this, in the present embodiment, it is possible to shorten the size of the short transverse of expansion valve。

Additionally, by making load bearing component 120 stay out of between limiting component 62 and valve body 10 so that the position of the above-below direction of limiting component 62 is not by the impact of the thickness of load bearing component 120, and therefore, the position of barrier film 130 is relatively stable, and the fluctuation of each performance is less。

It addition, the present invention can also be applicable to shown in Fig. 6, be configured to the threaded portion 120a by being formed at load bearing component 120 and be formed at the threaded portion 10a of valve body 10 dynamical element 100 spiral shell is installed to the expansion valve on valve body 10。

Further, it is also possible to without departing from the spirit and scope of the invention above-described embodiment is implemented various changes。

Claims

1. an expansion valve, it has: valve body, this valve body have import the ingress interface of high-pressure refrigerant and connect with ingress interface valve chamber, to the valve opening of valve chamber opening, be formed at the valve seat of the entrance of valve opening, send the discharge coupling of the cold-producing medium passed through from valve opening；Valve member, this valve member and valve seat relatively arrange；Dynamical element, this dynamical element has the pressure-operated room being sealed with action gas, the valve rod that valve member is operated by described action gas-powered, and this expansion valve is characterised by,

Described dynamical element has the formation cover unit of pressure-operated room, load bearing component and is clipped in the barrier film between described cover unit and described load bearing component,

The peripheral part of described cover unit, described barrier film and described load bearing component is engaged by the portion of dissolving that formed by laser weld, and described barrier film by described cover unit and the position of the fulcrum of described load bearing component clamping be from described dissolve portion the most deeply incorporate position leave the position of 0.2mm～1.0mm。

2. expansion valve according to claim 1, it is characterised in that described valve body has the cylindrical portion inserting dynamical element, described dynamical element is fixed by the top of described cylindrical portion carries out riveted joint processing。