CN101230935A

CN101230935A - Expansion valve

Info

Publication number: CN101230935A
Application number: CNA2008100085803A
Authority: CN
Inventors: 小林和人; 茂木隆
Original assignee: Fujikoki Corp
Current assignee: Fujikoki Corp
Priority date: 2007-01-26
Filing date: 2008-01-23
Publication date: 2008-07-30
Also published as: JP2008180475A; JP5100136B2

Abstract

In an expansion valve, in a first passage 12 through which a high pressure liquid refrigerant flows, an inlet port 321 includes a large diameter passage portion 13 formed from one side surface to the other side surface of a valve body 30, and a small diameter passage portion 14 that provides communication between the large diameter passage portion 13 on the bottom end thereof and a valve chamber 15. A coil spring 20 provided in the valve chamber 15 biases a valve member 32b toward a valve hole 32a. An O ring 19 that seals between a plug 17 that supports a lower end of the coil spring 20 and the valve body 30 is located below the small diameter passage portion 14 and placed on the opposite side of the bottom end of the large diameter passage 13. Thus, the plug 17 that closes an opening of the valve chamber 15 can be mounted to an upper position, thereby reducing a vertical size of the valve body 30 to further reduce a size of the valve body, and reducing an amount of use of metal materials for the valve body to reduce weight and cost.

Description

Expansion valve

Technical field

The expansion valve of the embedded with temperature-sensing mechanism type that the present invention relates to use in the refrigeration cycle.

Background technique

In the past,, space and distribution were set, the expansion valve of the embedded with temperature-sensing mechanism type that use is regulated the throughput of refrigeration agent according to temperature in order to save for carrying the refrigeration cycle of using in the aircondition on automobile etc.

Fig. 4 is the sectional view of an example of the expansion valve of the existing embedded with temperature-sensing mechanism type of expression, on valve body 30, first path 32 and alternate path 34 form up and down with being separated from each other, first path 32 becomes and is condensed device 5 condensations and flows through the path of liquid refrigerant of the high pressure of liquid container 6, and alternate path 34 is the paths that flow from the gaseous refrigerant that the refrigerant outlet of vaporizer 8 is supplied with to the refrigerant inlet of compressor 4.Wherein 11 is pipe arrangements.

In first path 32, be provided with: the inlet passage 321 that imports liquid refrigerant; The valve chamber 35 that is communicated with this inlet passage 321; Be arranged on the valve opening 32a in this valve chamber 35; Will be at the outlet passage 322 of the refrigeration agent after this valve opening 32a expands to the outside derivation.Inlet at valve opening 32a is formed with valve seat, relatively is provided with valve member 32b with this valve seat.Valve member 32b is compressed helical spring 32c towards the valve seat application of force.The lower end of valve chamber 35 is screwed stopper 37 sealings on valve body 30 at the bottom surface of valve body 30 opening.

The valve member drive unit 36 that is used for actuating valve parts 32b is installed in the upper end of valve body 30.Valve member drive unit 36 has pressure work cover 36d, and the inner space of this pressure work cover 36d is divided into two 36b of pressure working room, 36c up and down by barrier film 36a.The 36c of pressure working room of the below among the pressure work cover 36d and the center line of valve opening 32a form with one heart, and are communicated with alternate path 34 by balancing orifice 36e.The pressure of the gaseous refrigerant in the alternate path 34 is by the pressure working room 36c effect of balancing orifice 36e to the below.

The concentric shape of balancing orifice 36e dispose the valve opening 32a that below barrier film 36, extends to first path 32 valve member drive excellent 36f.Valve member drives excellent 36f and is set at first path 32 of valve body 30 and the guiding of the sliding guidance hole on the next door between the alternate path 34 and is free to slide lower end and valve member 32b butt at above-below direction.The sealed member 36g that is used to prevent the freezing medium leakage between first path 32 and the alternate path 34 is being installed on the above-mentioned next door.

Be filled with known barrier film driving fluid among the 36b of pressure working room of the top of pressure work cover 36d, the heat of the gaseous refrigerant that flows in alternate path 34 drives excellent 36f by the valve member that is positioned at alternate path 34 and balancing orifice 36e and barrier film 36a passes to the barrier film driving fluid.Barrier film driving fluid among the 36b of pressure working room of top gasifies because of the heat that above-mentioned transmission comes, and its gas pressure acts on the upper surface of barrier film 36a.The difference of the pressure that barrier film 36a loads according to the lower surface of the pressure of barrier film propellant on the surface that is applied to it and barrier film 36a and upper and lower displacement.The upper and lower displacement of barrier film 36a central part drives excellent 36f by valve member and passes to valve member 32b, and valve member 32b is toward or away from respect to the valve seat of valve opening 32a.Its result, the energy control flows is to the refrigerant flow of vaporizer 8.In addition, in following patent documentation 1, disclosed and had same expansion of structure valve, in valve member drives rod, taken in heat transmission and delayed parts, to prevent the vibration of valve member.

Patent documentation 1: TOHKEMY 2002-054861 communique

Yet, along with the miniaturization of aircondition in recent years etc., the space that is provided with that more and more is difficult to guarantee expansion valve, and also owing to constitute the rise of the material price of valve body, expansion valve as described above needs further miniaturization.

And, in expansion valve as described above, flowing through sometimes in the refrigeration agent of first path 32 and contain bubble, noise when flowing into valve chamber 35 internal ruptures, this bubble takes place.Big more this noise of known bubble diameter is just big more.

Summary of the invention

The object of the present invention is to provide a kind of expansion valve, can further realize the miniaturization of valve body, reduce to constitute the metallic material use amount of valve body, realize lightweight and reduce cost.

In order to address the above problem, expansion valve of the present invention comprises: valve body; Be formed on this valve body and import the inlet passage of the liquid refrigerant of high pressure; Be communicated with this inlet passage and the lower end at the valve chamber of the bottom surface of described valve body opening; Be arranged on the valve opening in this valve chamber; Being formed on also will be at the outlet passage of the refrigeration agent after described valve opening expands to the outside derivation on the described valve body; With the contact of the valve seat of the inlet that is arranged on described valve opening or separate the valve member that opens and closes described valve opening; Be arranged in the described valve chamber and the helical spring of described valve member towards the described valve opening application of force; The lower end that insertion is installed in described valve chamber is to support described helical spring lower end and to seal the stopper of the opening of described valve chamber; And be arranged between the interior perimembranous of the peripheral part of this stopper and described valve chamber to prevent that the refrigeration agent in the described valve chamber from leaking into outside O shape ring from described opening, it is characterized in that described inlet passage comprises: the big footpath passage portion that end shape is arranged that forms towards the opposing party's side from a side's of described valve body side; And will be somebody's turn to do the path passage portion that big directly access portion is communicated with described valve chamber, described O shape ring is positioned at the below of described path passage portion and is configured to relative with the bottom of described big footpath passage portion.

Expansion valve of the present invention comprises: the inlet passage that imports the liquid refrigerant of high pressure; The valve chamber that is communicated with this inlet passage; Be arranged on the valve opening in this valve chamber; Will be at the outlet passage of the refrigeration agent after this valve opening expands to the outside derivation; With the contact of the valve seat of the inlet that is arranged on described valve opening or separate the valve member that opens and closes described valve opening; And be arranged in the described valve chamber and to the helical spring of described valve member towards the described valve opening application of force, it is characterized in that, the gap between the described helical spring adjacent helix is set at the size that can make the bubble miniaturization that contains in the described liquid refrigerant.

Adopt the present invention, can utilize the helical spring as application of force means of valve member towards the valve seat application of force come the bubble in the refrigeration agent is carried out miniaturization, thereby the miniaturization means of bubble needn't be set in addition, and can not cause the part number to increase, can reduce refrigeration agent and pass through the sound.

In this expansion valve, described valve member is connected under the state on the described valve seat, and the gap between the described helical spring helix is below the 0.54mm in the size of described helical spring flexible direction.

So the top can more be partial to than the occasion of above-mentioned existing expansion valve in the mounting point of its stopper of expansion valve of the present invention that constitutes, and therefore can reduce the longitudinal size of valve body, reduces cost.

In addition, adopt expansion valve of the present invention, because it has above-mentioned formation, thereby when liquid refrigerant flows through helical spring, bubble in the refrigeration agent is by helical spring helix miniaturization, thereby can not cause the part number to increase, even bubble breaks and also can reduce refrigeration agent and pass through the sound.

Description of drawings

Fig. 1 is the figure of an example of expression expansion valve of the present invention.

Fig. 2 is the plotted curve of the refrigeration agent of expression expansion valve by the test result of the sound.

Fig. 3 is the figure of another example of expression expansion valve of the present invention.

Fig. 4 is the sectional view of an example of the expansion valve of the existing embedded with temperature-sensing mechanism type of expression.

Embodiment

Below, describe with reference to the example of accompanying drawing expansion valve of the present invention.Fig. 1 be expression expansion valve of the present invention an example longitudinal sectional view (Fig. 1 (a)) and be filled in the figure of the interior helical spring example (Fig. 1 (b)) of valve chamber.In the present embodiment, for having the equal key element and the position mark symbol identical with Fig. 4 of identical function with existing expansion valve shown in Figure 4, and omission is to their explanation once more.

In the expansion valve shown in Fig. 1 (a), inlet passage 321 has big footpath passage portion 13 and path passage portion 14, big footpath passage portion 13 is end shape, be connected with the pipe arrangement that is communicated with liquid container, and path passage portion 14 is positioned at the bottom end side of big footpath passage portion 13 and be communicated with valve chamber 15.Big footpath passage portion 13 and path passage portion 14 coaxial shape ground form.The valve opening 32a of valve chamber 15 tops is communicated with through hole 32d, and valve member drives excellent 36f and connects this through hole 32d with the state that has the gap.

The stopper 17 of airtight valve chamber 15 has the spring supporting portion 17a of tubular in valve chamber 15 sides.The inner side surface of spring supporting portion 17a forms straight inner core face 17b, and outer side surface forms the urceolus face 17c towards the multistage shape of tip side undergauge.Lower end and urceolus face 17c at valve chamber 15 are formed with stopper filling department 30a accordingly, and when stopper 17 screwed in, the internal thread part of the external thread part of stopper 17 sides and stopper filling department 30a side screwed, thereby stopper 17 is fixed on the valve body 30.

The inner core face 17b of the spring supporting portion 17a of stopper 17 is to radially being limited valve member 32b to prevent that helical spring 20 from tilting towards the helical spring described later 20 that closes the valve direction application of force.Stopper 17 is screwed under the inboard state, between stopper filling department 30a and urceolus face 17c, forms annulus 18.Annulus 18 is in the position relative with the bottom part of the big footpath passage portion 13 of first path 12 and is positioned at the below of path passage portion 14.In annulus 18, be filled with O shape ring 19, have the effect to external leaks of the refrigeration agent that prevents in the valve chamber 15 from the gap of valve chamber 15 and stopper 17.

Shown in Fig. 1 (b), the gap S that spacing (distance between centers of adjacent helix 21, the 21) P of helical spring 20 is deducted between the adjacent helix that line footpath d obtains sets narrowlyer, thereby can not damage the function of helical spring 20 and make bubble miniaturization in the refrigeration agent.For example, be under the close valve state (state that helical spring 20 becomes the longest) at valve member 32b, gap S is set in below the 0.54mm.When valve member 32b is in out the valve state, the refrigeration agent that flows into first path 12 flows through through hole 32d from valve chamber 15 and flows via big footpath passage portion 13, path passage portion 14, but the bubble of the above diameter of the gap S in the refrigeration agent when in valve chamber 15, flowing through helical spring 20 by the helix 21 fine diameters that change into below the S of gap.Therefore, even broken by the bubble after the miniaturization, the noise that take place this moment also can reduce, and the refrigeration agent that can reduce expansion valve passes through the sound.

Valve member 32b is had the concavity supporting surface at upside supporting part 24 supports.Downside at supporting part 24 has minor axis portion 25, and this minor axis portion 25 enters in the helical spring 20 from upside, and minor axis portion 25 has the helical spring of maintenance 20 and prevents the function that helical spring 20 falls down.Helical spring 20 is seated between stopper 17 and the supporting part 24 with compressive state.The inwall of valve chamber 15 on the top that links to each other with valve opening 32a forms stepped part 26 step-like of the appearance profile with corresponding supporting part 24, the gap of formation between the inwall that refrigeration agent can flow through valve chamber 15 and the supporting part 24.

The refrigeration agent of the graphical representation expansion valve of Fig. 2 is by the test result of the sound.The transverse axis of Fig. 2 is flow (kg/h), and the longitudinal axis is the acoustic pressure (dB) of refrigeration agent by the sound, is to be the plotted curve of parameter drafting with gap S.From this plotted curve as seen, gap S is 0.54mm when following, compares with the occasion of gap S more than 0.54mm to reduce acoustic pressure significantly, and refrigeration agent is remarkable by the reduction effect of the sound.

The size of valve chamber 15 internal diameters surpasses the external diameter of helical spring 20 slightly, stopper 17 has its spring supporting portion 17a can radially seamlessly accommodate helical spring 20 internal diameter of size like this, therefore, valve chamber 15 and stopper 17 can be to constitute with respect to helical spring 20 as far as possible little radial dimensions.And, it is relative with the bottom of the big footpath passage portion 13 of inlet passage 321 that O shape ring 19 is configured to, thereby can make above the screw-in position deflection of stopper 17, as mentioned above, owing to reduced the gap S of helical spring 20 and will admit the spring supporting portion 17a that bottom tube-like is arranged of the underpart of helical spring 20 to be arranged on the stopper 17, thereby realized the shortening of the longitudinal size of valve body 30.And the peripheral part of stopper 17 becomes step-like towards the upper end undergauge, O shape ring 19 is configured between the interior perimembranous of stopper upper end peripheral part and valve chamber 15 in the formed annulus 18, also can dwindle the transverse dimension of valve body 30.Therefore, miniaturization, lightweight and the cost that can realize expansion valve as a whole reduces.

Fig. 3 is the longitudinal sectional view of another example of expression expansion valve of the present invention.In the expansion valve shown in Figure 3, to equal key element of expansion valve shown in Figure 1 and position mark same-sign, and omit explanation once more to them.In the expansion valve shown in Figure 1, on the top of valve chamber 15, inwall forms the step-like of bight 26 with right angle, and the bubble in the refrigeration agent that flows through and this stepped part 26 are collided and helped collapse of bubbles, might cause that refrigeration agent passes through the sound.

In the expansion valve shown in Figure 3, the inwall on the top of valve chamber 15 forms the inclined-plane 27 of the roughly taper that enlarges towards the below.Therefore the step that the joint 28 of inclined-plane 27 between itself and valve opening 32a forms slightly, but be not the example big step like that of Fig. 1 not too can encourage collapse of bubbles, can play reduce reliably refrigeration agent by the time anti noise.

Claims

1. an expansion valve comprises: valve body; Be formed on this valve body and import the inlet passage of the liquid refrigerant of high pressure; Be communicated with this inlet passage and the lower end at the valve chamber of the bottom surface of described valve body opening; Be arranged on the valve opening in this valve chamber; Being formed on also will be at the outlet passage of the refrigeration agent after described valve opening expands to the outside derivation on the described valve body; With the contact of the valve seat of the inlet that is arranged on described valve opening or separate the valve member that opens and closes described valve opening; Be arranged in the described valve chamber and the helical spring of described valve member towards the described valve opening application of force; The lower end that insertion is installed in described valve chamber is to support described helical spring lower end and to seal the stopper of the opening of described valve chamber; And be arranged between the interior perimembranous of the peripheral part of this stopper and described valve chamber to prevent that the refrigeration agent in the described valve chamber from leaking into outside O shape ring from described opening, it is characterized in that,

Described inlet passage comprises: the big footpath passage portion that end shape is arranged that forms towards the opposing party's side from a side's of described valve body side; And will be somebody's turn to do the path passage portion that big directly access portion is communicated with described valve chamber, described O shape ring is positioned at the below of described path passage portion and is configured to relative with the bottom of described big footpath passage portion.

2. expansion valve as claimed in claim 1 is characterized in that,

The peripheral part of described stopper becomes step-like towards the upper end undergauge, disposes described O shape ring in the annulus that forms between the interior perimembranous of the upper end of described stopper peripheral part and described valve chamber.

3. expansion valve as claimed in claim 1 or 2 is characterized in that,

Described stopper has the spring supporting portion that bottom tube-like is arranged of admitting described helical spring underpart.

4. an expansion valve comprises: the inlet passage that imports the liquid refrigerant of high pressure; The valve chamber that is communicated with this inlet passage; Be arranged on the valve opening in this valve chamber; Will be at the outlet passage of the refrigeration agent after this valve opening expands to the outside derivation; With the contact of the valve seat of the inlet that is arranged on described valve opening or separate the valve member that opens and closes described valve opening; And be arranged in the described valve chamber and to the helical spring of described valve member towards the described valve opening application of force, it is characterized in that, the gap between the described helical spring adjacent helix is set at the size that can make the bubble miniaturization that contains in the described liquid refrigerant.

5. expansion valve as claimed in claim 4 is characterized in that,

Under described valve member was connected to state on the described valve seat, described gap was below the 0.54mm in the size of described helical spring flexible direction.