CN1971109A

CN1971109A - Expansion valve

Info

Publication number: CN1971109A
Application number: CNA2006101445493A
Authority: CN
Inventors: 小林和人; 渡边和彦; 儿山毅
Original assignee: Fujikoki Corp
Current assignee: Fujikoki Corp
Priority date: 2005-11-25
Filing date: 2006-10-27
Publication date: 2007-05-30
Anticipated expiration: 2026-10-27
Also published as: CN1971109B; JP2007147147A; JP4721881B2

Abstract

An expansion valve (1) includes a throttle nozzle (40) provided in the hole (36) formed inside the valve body (2) for moving freely; an operating bar (60) for moving the throttle nozzle (40); and a needle-shape valve (30) mounted in the hole (36) fixedly, at the same time changing the flow way area by the movement of the throttle nozzle (40). The number of the part can be cut without a existing ball of the valve body for opening and closing the throttle nozzle and a push part of the ball. Furthermore, the throttle nozzle (40) can move in the hole (36) and can suppress vibration by O-shape ring (44). Adopting the invention, the expansion valve without a existing ball for opening and closing the throttle nozzle and a push part of the ball, can reduce the number of the part, with simple structure, and can reduce the cost of manufacture.

Description

Expansion valve

Technical field

The present invention relates to a kind of flow and control the expansion valve of usefulness the refrigeration agent that is supplied in air-conditioning evaporator.

Background technique

In the past, in air attemperation apparatus as room air conditioner and auto air-con and the employed refrigeration cycle of refrigeration plant,, the flow of vaporizer was controlled according to the refrigerant pressure of the evaporator outlet side that changes along with the size of loading.In this kind expansion valve, because there is the deviation on the precision in the part of formation expansion valve, so proposing respectively has: after the part assembling, will be by the spiral action of adjusting bolt to closing the valve direction was adjusted, sets the adjustment of carrying out flow control to the spring force of the spool application of force adjustment type expansion valve; And be not provided with and carry out the bolt that spring is adjusted, get rid of the expansion valve that deviation on the element precision is guaranteed precision desired when part assembles as far as possible.

Patent document: TOHKEMY 2005-249273 communique

Fig. 4 is the sectional arrangement drawing of the expansion valve of prior art.Valve body 210 constitutes whole with the expansion valve housing shown in the symbols 200, in the lower side of this valve body 210, is formed with the 1st path 220 of the high-pressure refrigerant that acceptance sends here from the compressor side of aircondition.

The 1st path 220 is holes that the end is arranged, and is formed with valve chamber 222 near this bottom.Valve chamber 222 is communicated with the 1st path 220 and is formed on the 2nd path 226 in the valve body 210 abreast by being pressed into valve seat member 211 in the hole 216, and hole 216 forms the throttling path vertical with the 1st path 220 in valve body 210, and the 2nd path 226 is sent refrigeration agent to vaporizer side.In the upper side of valve body 210, be formed with the 3rd path 228 that be arranged in parallel with the 2nd path 226.The 3rd path 228 connects valve body 210, and the refrigeration agent that returns compressor side from vaporizer side is by the 3rd path 228.

In valve chamber 222, spherical spool 230 is from set relative with the throttling path of upstream side of the 1st path 220, and spool 230 is by fixing with the lower end welding of action rod 232.Action rod 232 slides in vertical hole 214 of valve body 210, and is located at the sealing that the sealing component 234 on the action rod 232 forms between the 2nd path 226 and the 3rd path 228.Action rod 232 connects the hole 212 of valve body 210, and the upper end 236 and limiting member 240 butts of action rod 232.

Whole have by the lid 262 of loam cake 263 with lower cover 263 ' formation with the power unit shown in the symbol 260, and lid 262 screws togather with the upper end of body 210 by the screw section 264 of lower cover 263 ', and the periphery of limiting member 240 is by lower cover 263 ' supporting simultaneously.Be provided with barrier film 266 on lid 262, the periphery of this barrier film 266 is clipped between loam cake 263 and the lower cover 263 ', is fixed together by welding, forms upper pressure chamber 268 and pressure chamber, bottom 269.In upper pressure chamber 268, be filled with for example refrigeration agent of working fluid, end by stopper 270 envelopes.

The upper surface of limiting member 240 and barrier film 266 butts, and upper end 236 end differences of the action rod 232 of the lower surface butt of limiting member 240 and form between the jut 213 of valve body 210 in hole 212 and be equipped with helical spring 242, this spring force imposes on limiting member 240 by moving rod 230 to pressure chamber, top 268 sides.The lower surface of limiting member 240 is formed with recess 241, upper end 236 butts of the bottom surface of recess 241 and action rod 232.

The hole 212 that the refrigeration agent that returns compressor side from vaporizer side by the 3rd path 228 flows through valve body 210 transfers the pressure to the lower surface of limiting member 240.Action rod 232 plays the effect of temperature-sensitive member, and by limiting member 240, barrier film 266, the temperature transfer that will flow through the refrigeration agent of the 3rd path 228 is given the working fluid in the upper pressure chamber 268.Action rod 232 is indexed to position that pressure and the pressure that acts on limiting member 240 lower surfaces in the upper pressure chamber 268 balances each other and adjusts the opening area of throttling paths by spool 230, and the refrigerant flow that is sent to vaporizer side by the 1st path 220, from the 2nd path 226 is controlled.

Like this, in the expansion valve of non-adjustment type,,, can help cost to reduce largely so not only reduced number of spare parts but also simplified assembly process owing to do not need to adjust the bolt of usefulness.But, in this expansion valve, to seek cost biglyyer and reduce, further cut down number of spare parts, and will seek further improvement making on this aspect of designs simplification.

Therefore, in the valve arrangement of expansion valve, be in the configuration of the pin spare of control flow rate and flow nipple cost time and exist in the problem that should solve on this aspect of further reduction number of spare parts.

Summary of the invention

The purpose of this invention is to provide a kind of expansion valve, the switching as the flow nipple ball of spool and the pressing member of this ball that this expansion valve need not use in existing expansion valve, thus can reduce number of spare parts, and simple in structure, can lower manufacture cost.

For achieving the above object, expansion valve of the present invention comprises: flow nipple, and it is arranged on with moving freely formedly in the valve body has in the bottom outlet; Action rod, its make described flow nipple described have in the bottom outlet move; And needle valve, it is installed in describedly has in the bottom outlet, simultaneously by described flow nipple move change and described flow nipple between flow path area.

Utilize this expansion valve, if when the valve start act of operation rod, action rod is just pushed flow nipple with its tip side, with change and be installed in distance between the needle valve in the bottom outlet.Change the flow path area between needle valve and the flow nipple, can change flow by the working fluid of expansion valve.

In above-mentioned expansion valve, can on described needle valve, form the pilot hole of the described action rod of guiding.As forming through hole on the needle valve in being installed on bottom outlet, just can form the excellent pilot hole that plays guiding function when mobile of action, by this guiding, the excellent action of long shape action is stablized.

In above-mentioned expansion valve, described needle valve can describedly have in the bottom outlet or fixes by the described wall portion that bottom outlet arranged is carried out punch process by being pressed into.By the installation in bottom outlet is arranged is pressed into or punch process or be pressed into punch process is all carried out to needle valve, thereby can carry out the installation of needle valve with the operation of cheapness.

In above-mentioned expansion valve, described flow nipple can comprise a portion and bottom, and described tube portion is inlaid in slidably and describedly has in the bottom outlet, and at one end can embed the top of described needle valve; And described bottom is connected with described tube portion, be formed with to allow the hole of pass through that fluid passes through, and can with the excellent top butt of described action.

Because the present invention constitutes as described above, thus can not need needed in the past conduct with the ball of the valve body of flow nipple switching and the pressing member of this ball of supporting, and can help to reduce number of spare parts and manufacture cost decline.And, though ball becomes the reason of vibration by spring energized meeting, by fixing needle valve and make flow nipple movable, can remove the member of easy vibration, also play the effect that prevents that allophone from taking place.

Description of drawings

Fig. 1 is the sectional arrangement drawing of expression expansion valve one example of the present invention.

Fig. 2 be expansion valve shown in Figure 1 want portion's enlarged view.

Fig. 3 is that the expansion valve of expression another embodiment of the present invention is wanted the sectional drawing of portion.

Fig. 4 is the figure of an example of the existing non-adjustment type expansion valve of expression.

Embodiment

Below, the embodiment to expansion valve of the present invention describes with reference to accompanying drawing.Fig. 1 is the sectional arrangement drawing of expression expansion valve one example of the present invention, Fig. 2 be expansion valve shown in Figure 1 want portion's enlarged view.The basic structure of the expansion valve of present embodiment is owing to the existing expansion valve not variation illustrated with reference Fig. 4, the explanation once more that the Therefore, omited is detailed.

Expansion valve 1 shown in Figure 1 is to be formed with the 1st path 20 and the 2nd path 24 that the high-pressure refrigerant that will reclaim by condenser condenses, by receiver by pipe arrangement 11 be sent to vaporizer 8 in the bottom of valve body 2 basically; The low pressure refrigerant that has evaporated that is formed with from evaporator drier 8 in future on the top of valve body 2 is sent to the 3rd path 26 of compressor 4; Between the 1st path 20 and the 2nd path 24, be formed be communicated with these

paths

20,24 bottom outlet 36 arranged.In bottom outlet 36 is arranged, be equipped with by needle valve 30, flow nipple 40, and to the locking direction of needle valve 30 to the valve system that the spring 34 of flow nipple 40 application of forces constitutes, be used for controlling refrigerant flow.And, have up/down perforation valve body 2 and the action rod 60 and the power unit 70 that makes excellent 60 starts of action of configuration, so that flow nipple 40 overcomes the application of force of spring 34 and moves to the valve opening position that leaves needle valve 30.，

In expansion valve 1, flow nipple 40 moves to be arranged on freely and is formed at having in the bottom outlet 36 in the valve body 2.Flow nipple 40 is made of a plurality of bottoms 42 by hole 45 that allow fluid to pass through that are formed with that are inlaid in the tube portion 41 in the bottom outlet 36 slidably and be connected with tube portion 41, and forms cup-shaped as a whole as wanting shown in the portion of amplifying among Fig. 2.In tube portion 41, at one end (upper end among the figure) embeds the coniform tip portion of needle valve 30.In the bottom 42, but the tip portion 61 of butt action rod 60.

In needle valve 30, be formed with through hole etc. as in the drawings above-below direction, be formed with the pilot hole 31 of guiding action rod 60.The action rod 60 of long shape is guided by pilot hole 31 when mobile, so can make the start of action rod 60 stable.Needle valve 30 has been pressed into bottom outlet 36 and has been mounted to fixing.According to the embedded degree of the coniform tip portion 32 of needle valve 30, can change the flow of flow system cryogen.

Be embedded in O type ring 44 at the formed annular slot 43 of the periphery of flow nipple 40, so that flow nipple 40 and liquid sealing between the bottom outlet is arranged.With respect to bottom outlet 36 sliding contacts are arranged, help to suppress the vibration of flow nipple 40 by O type ring 44.On bottom 42, be formed with a plurality of that the permission fluid of 2 above suitable quantities passes through and do not form through hole 45 at middle body 46 by holes 45, can with tip portion 61 butts of action rod 60.If the tip portion 61 of action rod 60 overcomes the application of force of spring 34 and flow nipple 40 is depressed, flow nipple 40 just moves to the valve opening position that leaves needle valve 30.If make action rod 60 to the direction of improvement start, flow nipple 40 just moves to the valve direction of closing near needle valve 30 in bottom outlet 36 is arranged by the application of force of spring.Like this, by 60 operate, can change the needle valve 30 that is installed in the bottom outlet 36 and the distance between the flow nipple 40 to moving rod, can change the flow path area between needle valve 30 and the flow nipple 40, and can change the flow of the working fluid that passes through expansion valve 1.

Embodiment as shown in Figure 1, do not need to be used to change and flow nipple 40 between flow path area ball and as the support member of this ball pressing member, so can reduce number of spare parts.Flow nipple 40 is by spring 34 application of forces, by O type ring with respect to there being basion 36 to slide, so can suppress the vibration of flow nipple 40.And,,, can reduce the noise level in the start so allophone can not take place owing to there is not other vibration key element.

Fig. 3 is that the expansion valve of expression another embodiment of the present invention is wanted the sectional drawing of portion.Identical with the member and the position of using among the embodiment shown in Figure 1, put on prosign, omit explanation once more.In the embodiment shown in fig. 3, needle valve 38 carries out punch process to the wall portion 37 that bottom outlet 36 is arranged simultaneously, thereby utilizes calking portion 39 to be mounted by being pressed in the bottom outlet 36.By with being pressed into the punch process mode needle valve 38 being installed in the bottom outlet 36, not only cheapness but also reliable of the installation of needle valve 38 plays the effect of needle valve 38 from there being bottom outlet to come off that prevent thus.

Vibration-proof spring 62 can in being arranged, bottom outlet 36 be set, to suppress the vibration of action rod 60.But, because the vibration of flow nipple 40 is suppressed very for a short time, so also can remove vibration-proof spring 62.Tip portion 61 diameters of action rod 60 form the shape of dwindling than other parts, pass through the mutual interference in hole 45 so can get rid of and be formed on flow nipple 40 bottoms 42.

Claims

1. an expansion valve is characterized in that, comprising:

Flow nipple, it is arranged on with moving freely formedly in the valve body has in the bottom outlet;

Action rod, its make described flow nipple described have in the bottom outlet move; And

Needle valve, it is installed in describedly has in the bottom outlet, change by moving of described flow nipple simultaneously and described flow nipple between flow path area.

2. expansion valve as claimed in claim 1 is characterized in that, is formed with the pilot hole of the described action rod of guiding on described needle valve.

3. expansion valve as claimed in claim 1 or 2 is characterized in that, described needle valve describedly has in the bottom outlet or fixes by the described wall portion that bottom outlet arranged is carried out punch process by being pressed into.

4. as each described expansion valve among the claim 1-3, it is characterized in that described flow nipple comprises a portion and bottom, and described tube portion is inlaid in slidably and describedly has in the bottom outlet, and at one end can embed the top of described needle valve; And described bottom is connected with described tube portion, be formed with to allow the hole of pass through that fluid passes through, and can with the excellent top butt of described action.