CN101086296A

CN101086296A - Expansion valve

Info

Publication number: CN101086296A
Application number: CNA2007101054297A
Authority: CN
Inventors: 广田久寿
Original assignee: TGK Co Ltd
Current assignee: TGK Co Ltd
Priority date: 2006-06-07
Filing date: 2007-05-30
Publication date: 2007-12-12
Also published as: EP1865275A2; US20070283717A1; KR20070117464A; JP2007327672A

Abstract

The present invention provides an expansion valve for improving the manufacturing efficiency of a body, and reducing the manufacturing cost of an expansion valve. The body accommodating a valve section is formed, using forming dies, such as die-casting dies, integrally with an inlet port for introducing refrigerant, an outlet port for delivering expanded refrigerant, a male thread, and has a power element connected thereto by the male thread. This eliminates a necessity of subjecting the body to fabrication, for forming the inlet port, the outlet port, a valve hole, a hole for receiving therein a valve element and set value-adjusting members, a hole for receiving therein a shaft which transmits an actuating force dependent on temperature sensed by the power element to the valve element, and further the male screw. Therefore, the manufacturing efficiency of the body is improved, and the manufacturing cost of the expansion valve can be reduced.

Description

Expansion valve

Technical field

The present invention relates to a kind of mounting structure of expansion valve, relate more specifically to a kind of being configured to and in the refrigeration cycle of car air conditioner, high temperature, high pressure liquid refrigerant by condenser condenses are expanded, and low temperature, low pressure refrigerant are transported to the expansion valve of vaporizer.

Background technique

Usually, the cooling cycle system of motorcar air conditioner comprises: compressor, and this compressor compresses cycles through the refrigeration agent of cooling cycle system; Condenser, this condenser makes the refrigerant compressed condensation; Receiver, the temporary transient storage of this receiver cycles through the refrigeration agent of cooling cycle system, and condensed refrigerant is separated into gas and liquid; Expansion valve, this expansion valve make by gas/liquid and separate liquid refrigerant throttling and the expansion that obtains; And vaporizer, the refrigeration agent that this evaporator evaporation expands by expansion valve.This expansion valve is realized that by for example thermostatic expansion valve described thermostatic expansion valve is configured to the temperature and pressure of the refrigeration agent at sensing evaporator outlet place, and control is to the flow velocity of the refrigeration agent of vaporizer conveying.

This thermostatic expansion valve comprises body, and described body is formed with: first path, pass through described first path from receiver to the refrigeration agent that vaporizer flows; And alternate path, the refrigeration agent that is back to compressor from vaporizer is by described alternate path.In the intermediate portion of body first path, be provided with valve portion to be used to control the flow velocity of refrigeration agent, and the position in body on alternate path one side is provided with executive component being used for temperature and the pressure of senses flow through the refrigeration agent of alternate path, and the control valve part is via the valve stroke (referring to for example TOHKEMY 2002-115938 communique) of actuator shaft.

At this, body generally by the extrusion moulding spare that cuts aluminum alloy, and the position that forms first path, alternate path by cutting subsequently and be connected with executive component make, wherein aluminum alloy is in light weight, and very easily is processed into the prism-shaped part, to prepare the physical components of half product.Yet, to the expensive time of cutting meeting of described parts, and the quantum of output of reduction material, this has improved manufacture cost.

On the other hand, a kind of technology (referring to Japanese kokai publication hei 10-267470 communique) of for example making body by the use blow molding has been proposed.Notice that above-mentioned alternate path can have simple flat shape, thereby can adopt this technology to come in the process that the body extrusion moulding is handled, to form alternate path simultaneously.The hole that can omit the cutting alternate path like this form to be handled, is saved aluminum alloy material, and improved the manufacturing efficient of body to a certain extent.

Yet, in above-mentioned blowing, need to extrude aluminum alloy along the fixing direction of extruding, therefore only can be applied to have the flat shape of constant cross-section.Therefore, this technology can not be applied to be formed on first path that forms valve portion in the position, intermediate portion.And, be formed with sealing surface on each end of first path and alternate path, described sealing surface is provided with sealing component, thereby when the pipe that leads to compressor, receiver and vaporizer is connected to described end, can plug described sealing component, and described sealing surface forms the surface of diameter-increasing portion, so just can not form described sealing surface by extrusion molding.Therefore, when forming these parts, except cutting, do not have other method, and have the problem that fully to save material, can not fully improve manufacturing efficient thus.

And, form after the alternate path by extrusion-blown modling, using when attempting to cut on the end at described alternate path such as lathe, the axis that is not easy to the path that will form by extrusion molding in working angles aligns with spin axis.Therefore, when forming hermetic unit by the instrument such as rig, the axis of described instrument can depart from the axis of path, acts on described instrument and the body thereby have eccentric load in working angles, and this can cause trouble to cutting.

And the junction point between body and executive component has worm structure, thereby needs that part of formation screw thread that will be connected to executive component of body, and this has reduced manufacturing efficient and has increased manufacture cost.

Summary of the invention

Consider above problem and make the present invention, the objective of the invention is to improve the manufacturing efficient of body, and reduce the manufacture cost of expansion valve.

In order to overcome the above problems, the invention provides a kind of expansion valve, described expansion valve transmits the refrigeration agent of introducing through being arranged on valve portion in the described expansion valve so that the refrigeration agent of being introduced is carried out throttling and expansion, wherein, the body that holds described valve portion is connected to helical thread portion on the described valve portion by using shaping die to form with executive component.

Above and other purpose of the present invention, feature and advantage will become clear from the description below in conjunction with accompanying drawing, described accompanying drawing shows the preferred embodiments of the present invention in the mode of example.

Description of drawings

Fig. 1 is the central sectional view that illustrates according to first embodiment's expansion valve.

Fig. 2 show the method for making the expansion valve body major component schematically illustrate figure.

Fig. 3 A is the planimetric map of body.

Fig. 3 B is the front view of body.

Fig. 4 is the sectional drawing of the installation example of the expansion valve according to the present invention.

Fig. 5 is that the line A-A along Fig. 4 cuts open the sectional drawing of getting.

Fig. 6 is the sectional drawing according to the installment state of second embodiment's expansion valve and described expansion valve.

Fig. 7 is that the line B-B along Fig. 6 cuts open the sectional drawing of getting.

Fig. 8 is the sectional drawing according to the installment state of the 3rd embodiment's expansion valve and described expansion valve.

Fig. 9 is in the figure of the expansion valve of installment state from the ingress port unilateral observation.

Figure 10 is the sectional drawing according to the installment state of the 4th embodiment's expansion valve and described expansion valve.

Figure 11 is that the line C-C along Figure 10 cuts open the sectional drawing of getting.

Embodiment

Hereinafter, will be described in detail with reference to the attached drawings embodiments of the invention.

Fig. 1 is the middle section figure according to first embodiment's expansion valve.

Expansion valve 1 comprises the valve portion 2 and the executive component 3 of control refrigeration agent flow velocity.Described valve portion 2 comprises body 4, the side of described body 4 is formed with ingress port 5 and outlet port 6, wherein said ingress port 5 is connected to the receiver of cooling cycle system to be used to introduce the refrigeration agent of high pressure, high temperature, and described outlet port 6 is connected to vaporizer to be used to transport the refrigeration agent of low temperature, low pressure.Be formed with valve opening 7 at the middle part of body 4, the refrigeration agent that described valve opening 7 will be introduced ingress port 5 is sent to outlet port 6, thus described valve opening 7 edges and the perpendicular direction extension of the respective axis of ingress port 5 and outlet port 6.Be formed with the hole 8 of diameter greater than the diameter of valve opening 7 in the body 4, extend towards below shown in Figure 1 from valve opening 7 in described hole 8, passes body along the direction of the axis of valve opening 7.Being provided with the cross section in the hole 8 is leg-of-mutton valve element 9, and described valve element 9 is subjected to the pushing of spring 10 along the valve closing direction.Described spring 10 is received by the spring receiving member 11 that press fit in 8 openings of hole.The loading of spring 10 is regulated by the amount of being press-fitted that spring receiving member 11 is press fit in 8 openings of hole, thus the setting value of variable expansion valve 1.Body 4 also is formed with the hole 12 that diameter is slightly less than valve opening 7, and extend towards top shown in Figure 1 from valve opening 7 in described hole 12, passes body along the direction of the axis of valve opening 7.Be provided with the axle 13 integrally formed in the described hole 12 with valve element 9.Described axle 13 has the part that diameter reduces with the corresponding position of extension part that begins from ingress port 5, thereby has guaranteed that refrigeration agent flows into the path of valve openings 7 from ingress port 5.Axle 13 grooves that also have the periphery that circumferentially is formed on the part that is arranged in valve opening 12, and in described groove, be provided with V-arrangement filler 14 and leak to executive component 3 to prevent the high-pressure refrigerant of introducing ingress port 5 via the gap between axle 13 and the body 4.Body 4 has hollow barrel-type guide 15, and described guide 15 is used for retainer shaft 13, and is formed with outside thread 16 on the periphery of described guide 15 to be formed on the intermediate portion on body top as shown in Figure 1 from body 4 outstanding modes.

Executive component 3 comprises: upper body 17 and lower case 18, and described upper body 17 and lower case 18 are the form of thick metal dish; Diaphragm 19, described diaphragm 19 are made by the tinsel of flexibility and are provided with in the mode of separating the space that is surrounded by housing 17 and housing 18; And coiling 20, described dish 20 is arranged on diaphragm on a side of valve portion 2.Executive component 3 is to be welded to each other (for example by the TIG welding) by the peripheral edge with upper body 17, lower case 18 and diaphragm 19 to form.Define the temperature sensing chamber that is surrounded by upper body 17 and diaphragm 19 like this, described temperature sensing chamber is introduced hole 21 and is filled with saturated steam via the gas that passes upper body 17 formation.Described gas is introduced hole 21 and can be closed by for example resistance welding of Metal Ball 22.Therefore, the temperature sensing chamber forms and is used for the temperature of sensing from the refrigeration agent of vaporizer outflow.

Lower case 18 has the middle part of opening.Described opening and the hollow barrel-type pipe box 23 of opening the middle part forms.The inboard of described pipe box 23 is formed with internal thread to be spun on the outside thread 15 that is formed on guide 15 peripheries.And lower case 18 has gas by hole 25.The refrigeration agent that described gas will be carried from vaporizer by hole 25 is introduced the space on diaphragm 19 lower face side, and regulates the amount of introducing refrigeration agent by changing each gas by the number in hole by the size or the gas in hole.Diaphragm lower surface as shown in Figure 1 has from the end face of the outstanding axle 13 of body 4 via dish 20 butts, so the displacement of diaphragm 19 is passed to valve element 9.

The body 4 of Gou Zao expansion valve 1 preferably forms by the die casting of metal as mentioned above, thereby need not the processing such as cutting.Next, the major component to the method for making body 4 describes.

Fig. 2 show the method for making the expansion valve body major component schematically illustrate figure.With the identical composition member of the composition member with in appearing at Fig. 1 that occurs in the identical reference character presentation graphs 2.

Body 4 can be made by the die casting of aluminum alloy, zinc alloy or other metal, but the following description that will provide by the mode of example to the situation of aluminium die cast alloy.Used a kind of die casting equipment in the present embodiment, described die casting equipment comprises first mould 30, second mould 40 and the 3rd mould 50, and described die casting equipment is configured to activate first mould 30 and second mould 40 by the actuator (not shown) along substantially horizontal shown in Figure 2, and activates the 3rd mould 50 by the actuator (not shown) along vertical direction shown in Figure 2.

First mould 30 has cavity 31 on a side of its relative second mould 40, this cavity 31 is used to form the part that is provided with ingress port 5 of body 4.In described cavity 31, port path formation part 32 forms towards second mould 40 outstanding, is used to form ingress port 5, and is formed with screw thread formation part 33 in cavity 31, is used to form half of outside thread 16.Second mould 40 has cavity 41 on a side of its relative first mould 30, this cavity 41 is used to form the part that is provided with outlet port 6 of body 4.In described cavity 41, port path formation position 42 forms towards first mould 30 outstanding, is used to form outlet port 6, and is formed with screw thread formation part 43 in cavity 41, is used to form half of outside thread 16.The 3rd mould 50 has cavity 51 to form the part that is press-fitted spring receiving member 11 of body 4.In described cavity 51, hole formation part 52, valve opening formation part 53 and hole formation part 54 form outstanding towards top shown in Figure 2, are respectively applied for and form hole 8, valve opening 7 and hole 12.Should be noted that, first mould 30, second mould 40 and the 3rd mould 50 are formed with the drain passageway that the injection path that is used to pour into molten aluminium alloy forms the groove (not shown) and be used for emptying

cavity

31,41 and 51 respectively and form the groove (not shown) in their apparent surface, and are formed with and are used for the insertion instrument to discharge the patchhole of foundry goods from mould.

When making body 4, molten aluminium alloy is fed in the set of molds of firmly fastening first mould 30, second mould 40 and the 3rd mould 50 via hand-hole.In the present embodiment, but adopt and to have the Al-Si-Cu alloy of good castability as described aluminum alloy.After the alloy of fusion solidifies, the 3rd mould 50 is extracted towards below shown in Figure 2, and first mould 30 and second mould 40 is separated from one another.In the process of doing like this, first mould 30 and second mould, 40 along continuous straight runs are moved, make simultaneously releasing tool be pushed against with first mould 30 and foundry goods that second mould 40 closely contacts on.Like this, by with mold structure for having the separable structure of three-dimensional (wherein mould can be separated from each other along corresponding three directions), thereby can form body, make body be formed with ingress port 5, outlet port 6, valve opening 7,

hole

8 and 12 and outside thread 16, needn't process valve opening 7, helical thread portion or the like thus.And, because body 4 forms based on the three-dimensional separable structure of mould, thereby can make ingress port 5 identical or parallel to each other with the respective axis of outlet port 6, and hole 8, valve opening 7 and hole 12 are arranged on the same axis on the direction vertical with the direction of these axis, make them have the corresponding internal diameter that reduces successively with the order of mentioning.

Should be noted that, in above-mentioned die casting equipment, the single foundry goods of described device fabrication is supposed in the explanation that provides, but because the three-dimensional separable structure of mould, described equipment can be configured to many cover first moulds 30, second mould 40 and the 3rd mould 50 is set parallel to each other, and operate simultaneously along described three directions, make like this to be easy to the die casting equipment that construction allows to obtain simultaneously a plurality of foundry goods.

Fig. 3 A is the planimetric map of body outward appearance.Fig. 3 B is the front view of body outward appearance.

The body of making by die casting 4 is formed with: hollow barrel-type part 5a, described hollow barrel-type part 5a limit ingress port 5 and extend along the direction that first mould 30 is separated; Hollow barrel-type part 6a, described hollow barrel-type part 6a limit outlet port 6 and extend along the direction that second mould 40 is separated; The hollow barrel-type part 8a of limiting hole 8 and the guide 15 of limiting hole 12, and hollow barrel-type part 8a extends along the direction that the 3rd mould 50 is separated with guide 15.And, the outside thread 16 that is formed on guide 15 peripheries is partial screw threads, wherein the part towards with the rectangular direction of the respective direction that first mould 30 is separated with second mould 40 of guide 15 outer circumferential faces does not have screw thread, this outside thread comprises: helical thread portion 16a, described helical thread portion 16a be formed on guide 15 on the outer peripheral portion of the direction that first mould 30 is separated; And helical thread portion 16b, described helical thread portion 16b be formed on guide 15 on the outer peripheral portion of the direction that second mould 40 is separated.Should be noted that, in the present embodiment, body 4 has and the extension component 4a that extends along the rectangular direction of the respective direction that first mould 30 is separated with second mould 40, as described below, when being combined in expansion valve 1 in the cooling cycle system, described extension component 4a has the effect that makes expansion valve 1 location.

Next, will the application example and the operation thereof of the expansion valve 1 of construction as mentioned above be described.

Fig. 4 is the sectional drawing according to the example of the installation of expansion valve of the present invention, and Fig. 5 is that the line A-A along Fig. 4 cuts open the sectional drawing of getting.

Expansion valve 1 is installed in from vaporizer 60 and extends to returning the low-voltage tube of compressor, thereby expansion valve 1 all is contained in and returns in the low-voltage tube, and, the connection of the high-voltage tube 61 that ingress port 5 to the liquid refrigerant supply of condensation is passed through and the refrigeration agent that carry to expand via outlet port 6 to described the returning in the low-voltage tube that be connected of the inlet duct 62 of vaporizer 60 set up.

More specifically, vaporizer 60 for example forms by the slice weldering with shell 64, thereby shell 64 surrounds inlet duct 62 and refrigerant outlet port 63.Low-voltage tube 65 has an end to be soldered to connector portions 66 (part of representing by black triangle), and described connector portions 66 is connected to shell 64 hermetically by pipe clamp 67.Described low-voltage tube 65 and high-voltage tube 61 form two-tube, coaxially are arranged in the low-voltage tube 65 at described two-tube mesohigh pipe 61.Should be noted in the discussion above that junction point and the junction point between shell 64 and the connector portions 66 between junction point, outlet port 6 and the inlet duct 62 between ingress port 5 and the high-voltage tube 61 seal by corresponding O shape ring.And expansion valve 1 has the heat-insulating cover 68 that resin or rubber are made, and described heat-insulating cover 68 is attached to described executive component 3 in the mode that covers executive component 3.

Be contained in expansion valve 1 in the shell 64 and be positioned at the middle part of shell 64, and thus as shown in Figure 5, the extension component 4a of body 4 and heat-insulating cover 68 have the respective external profile that forms along the interior shape of shell 64.

At this moment, expansion valve 1 is installed in (described shell 64 has played from the effect of the low pressure recurrent canal of vaporizer 60 beginnings) in the shell 64 in such a way: because vaporizer 60 and the welding of shell 64 one, and make that the inlet duct 62 of vaporizer 60 is prominent to shell 64, therefore at first O shape ring is assemblied on the inlet duct 62, subsequently expansion valve 1 is pushed shell 64, in inlet duct 62 being assemblied in outlet port 6.O shape ring is assembled on the ingress port 5 of expansion valve 1 in advance or at this moment.Then, ingress port 5 is positioned to it and can be assemblied in the high-voltage tube 61, and the connector portions 66 that is equipped with O shape ring in advance in the corresponding recesses that forms of end by bending connector portions 66 is pushed in the shell 64.At last, connect the attachment portion of shell 64 and the attachment portion of adapter piece 66 by pipe clamp 67.

Like this, expansion valve 1 is installed in the shell 64, and wherein ingress port 5 is connected to high-voltage tube 61, and outlet port 6 is connected to the inlet duct 62 of vaporizer 60.By this structure, expansion valve 1 and be accommodated in together from the low pressure recurrent canal of vaporizer 60 beginnings to the junction point of high-voltage tube 61, therefore even the high-pressure refrigerant of trace is arranged owing to see through the O shape ring of junction point and leak via this O shape ring, leaded refrigeration agent also can be retained in the low pressure recurrent canal and not leak in the atmosphere.

Next, will the operation of expansion valve 1 be described.When motorcar air conditioner was shut down, the saturated vapour that charges into the temperature sensing chamber of executive component 3 was condensed, thereby the pressure of described gas is lower.Therefore, diaphragm 19 is to intrinsic displacement, and described displacement is passed to valve element 9 via dish 20 and axle 13, and expansion valve 1 is placed in the state of complete closure for this reason.

When motorcar air conditioner started in this state, refrigeration agent was extracted out by compressor, and the pressure in the low-voltage tube 65 descends thus.Executive component 3 senses this point, thus diaphragm 19 to outer displacement with poppet valve member 9.On the other hand, by condenser condenses, and separate the liquid refrigerant that is obtained is supplied to expansion valve 1 by high-voltage tube 61 ingress port 5 by the refrigeration agent of compressor compresses by the gas/liquid in the receiver.Should be noted in the discussion above that the arrow that occurs among the figure represents the respective direction of refrigeration agent stream.The liquid refrigerant of high temperature, high pressure expands through expansion valve 1 time, and flows out from outlet port 6 with the form of low temperature, low pressure gas one liquid mix refrigerant.Refrigeration agent is supplied to vaporizer 60 by inlet duct 62, and evaporates in vaporizer 60 to flow out from refrigerant outlet port 63.The refrigeration agent that transmits from vaporizer 60 returns compressor via shell 64 and low-voltage tube 65.

Space by lower case 18 sealings of the diaphragm 19 of executive component 3 and executive component 3 communicates by the inside of hole 25 with shell 64 via gas, thereby when the refrigeration agent that returns from vaporizer 60 passes through shell 64, some refrigeration agents are introduced in the space in the executive component 3, and the temperature of the refrigeration agent of introducing by executive component 3 sensings.In the early stage that motorcar air conditioner starts, the temperature of the refrigeration agent that returns from vaporizer 60 is because the heat exchange of carrying out with high temperature air the vehicle passenger compartment and higher, and the temperature of executive component 3 sensing refrigeration agents, thereby the pressure in the temperature sensing chamber raises.This expands (inflate) diaphragm 19, thus the direction actuating valve element of opening along valve 9, and expansion valve 1 is opened fully for this reason.

Because come the temperature of the refrigeration agent of from evaporator drier 60 to reduce, so the pressure in the temperature sensing chamber also reduces.Therefore, diaphragm 19 is to the internal displacement of temperature sensing chamber, thereby expansion valve 1 moves with the flow velocity of control through the refrigeration agent of expansion valve 1 along the direction of valve closure.At this moment, expansion valve 1 is operated the refrigerant temperature with detection vaporizer 60 outlet ports, and controls the flow velocity of the refrigeration agent that is supplied to vaporizer 60, thereby refrigeration agent keeps the predetermined degree of superheat.

Should be noted in the discussion above that because executive component 3 is arranged on from the low pressure recurrent canal of vaporizer 60 beginnings, thereby the temperature of refrigeration agent can be detected by whole executive component 3, so executive component 3 is owing to its structure has very short temperature sensing time constant.If the temperature sensing time constant is shorter, then the response that refrigerant temperature is changed can become very sensitive, so that can carry out excessive feedback modifiers to the operation of valve portion 2, this will cause periodic variation in pressure (vibration).In order to eliminate this inconvenience, heat-insulating cover 68 is set stops the transmission of heat, to increase the temperature sensing time constant thus to upper shell 17.

Fig. 6 shows the sectional drawing according to the expansion valve of second embodiment of the invention and described expansion valve installment state, and Fig. 7 is that the line B-B along Fig. 6 cuts open the sectional drawing of getting.Appear among Fig. 6 and Fig. 7 have with appear at Fig. 1 and Fig. 4 in element element identical or suitable function represent with identical reference character, and omit detailed description thereof.

Be that with difference the respective axis that the body 4 of described expansion valve 1a forms ingress port 5 and outlet port 6 is perpendicular to one another according to second embodiment's expansion valve 1a according to first embodiment's expansion valve 1.This body 4 is also formed by the die casting equipment that its mould has a three-dimensional separable structure.Yet in the situation of expansion valve 1a, first mould 30 is configured to it can form the extension 4a of body 4 and the helical thread portion 16a of outside thread 16.And, in the body 4 of expansion valve 1a, valve element 9, along the spring 10 of valve closing direction pushing valve element 9 and the spring receiving member 11 that is used for receiving described spring 10 be arranged on outlet port 6.

Gou Zao expansion valve 1a is favourable in following situation like this, that is, expansion valve 1a is arranged so that the engine compartment from being furnished with compressor that high-voltage tube 61 and low-voltage tube 65 forms extends to the inlet duct 62 of the two-tube longitudinal direction of the vehicle passenger compartment that is furnished with vaporizer 60 and vaporizer 60 and direction that refrigerant outlet port 63 is opened is rectangular substantially.

Therefore, the low-voltage tube that returns that expansion valve 1a is installed in it is configured to bend to the right angle.More specifically, vaporizer 60 forms by the slice weldering with inlet duct 62 and attachment portion 64a.Shell 64 is connected to attachment portion 64a by pipe clamp 67, and connector portions 66 is soldered to shell 64 top as shown in Figure 6.Connector portions 66 is connected to low-voltage tube 65 by pipe clamp 67.

Expansion valve 1a with body 4 (this body 4 is configured such that ingress port 5 and outlet port 6 extend along the respective direction that is perpendicular to one another) is installed in to have in the shell 64 and connector portions 66 of the respective openings of orthogonal direction, as mentioned above.Body 4 has extension 4a wherein and extends near shell 64 internal surface as shown in Figure 7 profile along corresponding three directions always, when expansion valve 1a being inserted shell 64 and will export port 6 when being connected to inlet duct 62, is easy to make expansion valve 1a to locate like this.

Fig. 8 shows the expansion valve of a third embodiment in accordance with the invention and the sectional drawing of described expansion valve installment state, and Fig. 9 is in expansion valve under the installment state from the view of ingress port unilateral observation.Appear among Fig. 8 and Fig. 9 have with appear at Fig. 1 and Fig. 4 in element element identical or suitable function represent with identical reference character, and omit detailed description thereof.

Having identical construction with expansion valve 1 aspect the body 4 according to the 3rd embodiment's expansion valve 1b, but changing the structure of junction point between executive component 3 and the body according to first embodiment.More specifically, the executive component 3 of above-mentioned expansion valve 1 and 1a has and is formed on the internal thread 24 of pipe box 23 (this pipe box 23 stretches out from the central opening of lower case 18) interior week.Described internal thread 24 after forming lower case 18 by compacting (pressing) by pipe box 23 being carried out tapping or compacting forms.Therefore, the structure of the executive component 3 of expansion valve 1 and 1a need be used to form the processing of internal thread 24.On the contrary, the executive component 3 of expansion valve 1b is configured to form internal thread 24 when forming lower case 18 by compacting.

Promptly, the central opening of lower case 18 interior week be formed with screw thread, described screw thread has otch in 60 degree angular ranges of its whole circumference, and the displacement continuously vertically in the angle of residue 300 degree of described screw thread, thereby be assumed to be the pitch that the screw thread axial displacement that forms equals to be formed on the outside thread 16 on the guide 15 substantially in the angular range of 360 degree.Central opening by such structure lower case 18, make it have the worm structure of a circle, can be by whole (comprising internal thread 24) extruding and by forming lower case 18 in conjunction with lower case 18 and the body 4 that forms by die casting, and do not need to process, therefore can further reduce the cost of expansion valve 1.

And in expansion valve 1b, executive component 3 is configured to not have projection, thereby has simplified the shape of heat-insulating cover 68.More specifically, upper body 17 has the shape that outwards expands substantially, but comprises that the middle part of gas bullport 21 forms recess, like this, when the closed gas bullport 21 of Metal Ball 22, prevented that described Metal Ball 22 is outstanding from the outmost surface of upper body 17.

Similar with expansion valve 1 according to first embodiment, expansion valve 1b be installed in the integrally formed shell 64 of vaporizer 60 in.In the present embodiment, by the recessed inlet duct 62 that is connected to outlet port 6 that forms vaporizer 60 of the plate that makes the head part that forms vaporizer 60, thereby the hollow barrel-type part 6a that will export port 6 is assemblied in the described inlet duct 62.And low-voltage tube 65 is opened by the one end is expanded, and by using pipe clamp 67 to be connected directly to shell 64.At this moment, by utilizing pipe clamp 67, thereby carry out the connection between low-voltage tube 65 and the shell 64 at supporting ring 69 set casing 64 and supporting ring 69 under the state that keeps shell 64, low-voltage tube 65 and O shape ring on atmosphere one side.

Figure 10 shows the sectional drawing according to the 4th embodiment's expansion valve and described expansion valve installment state, and Figure 11 is that the line C-C along Figure 10 cuts open the sectional drawing of getting.Appear among Figure 10 and Figure 11 have with appear at Fig. 1 and Fig. 4 in element element identical or suitable function represent with identical reference character, and omit its detailed explanation.

First to the 3rd embodiment's

expansion valve

1,1a and 1b are configured to according to the present invention: when ingress port 5 receives high-pressure refrigerant, and the direction action that valve element 9 is opened along valve; And the expansion valve 1c of a fourth embodiment in accordance with the invention is configured to: when receiving high-pressure refrigerant at ingress port 5 places, valve element 9 is along the direction action of valve closure.Therefore, body 4 is configured in the inside of described body 4, ingress port 5 and wherein the hole 8 of receiving valve element 9 communicate with each other, and the hole 12 and the outlet port 6 of receiving axes 13 communicate with each other within it.In brief, the present embodiment relation that is configured to ingress port 5 and outlet port 6 with according to the ingress port 5 of first embodiment's expansion valve 1 with to export the relation of port 6 opposite.

And, in expansion valve 1c, changed the structure of junction point between executive component 3 and the body 4.More specifically, above-mentioned expansion valve 1 and the executive component 3 of 1a are configured to form the pipe box 23 of internal thread 24 and outwards give prominence to from the central opening of lower case 18, and expansion valve 1c is configured to forming in interior week of the central opening of pipe box 23 by the lower case 18 that bends inwards, and the inner peripheral surface of the bending part of pipe box 23 is formed with screw thread.Reduce the total height of expansion valve 1c like this, thereby reduced the size of described expansion valve 1c.And internal thread 24 can be preferably formed and be rolled thread (rolled thread).Described rolled thread is easier to cutting than the compacting screw thread, can reduce the cost of manufacturing thus.

And the heat-insulating cover 68 that covers executive component 3 passes through resin molded and integrally formed with Convenient table 68a.Although not shown, each Convenient table 68a is formed with hook in its end, and described hook engages with step part in being formed on body 4, thus fixing heat-insulating cover 68.

And, contrast first embodiment to the, three embodiments' situation, adjusted the mounting type of expansion valve 1c in the present embodiment.More specifically, in situation according to first embodiment to the, three embodiments'

expansion valve

1,1a and 1b, not only high-voltage tube 61 and low-voltage tube 65 but also inlet duct 65 and shell 64 are formed by two-tube respectively, and each

expansion valve

1,1a and 1b are installed in the described two-tube intermediate portion.On the contrary, in the expansion valve according to present embodiment, the low-voltage tube 65 in the pipe of vaporizer upstream and vaporizer downstream forms independently pipe, and expansion valve 1c is installed in the intermediate portion of described pipe.

For example be connected to shell 64 integratedly from each end of extended inlet duct 62 of vaporizer and low-voltage tube 65a, and relative end, the end with low-voltage tube 65a of relative end, the end with inlet duct 62 of high-voltage tube 61 and low-voltage tube 65b is connected to dish type connector portions 66 rigidly by welding by welding.Shell 64 is connected by pipe clamp 67 with connector portions 66.Should be noted in the discussion above that what extend to that the pipe of compressor passes through from vaporizer is the low refrigeration agent of refrigeration agent of the density pipe that extends to vaporizer than flowing through, therefore from vaporizer extend to compressor tubular to become diameter bigger than the diameter of the pipe that extends to vaporizer.Therefore, be connected with the junction point of described pipe, the corresponding size of shell 64, connector portions 66 and pipe clamp 67 increases according to the diameter of relevant tube.Yet in the present embodiment, the foremost joint part that is connected to the low-voltage tube 65b of connector portions 66 forms flat pattern, and as shown in figure 11, thereby the size that prevents described connector portions 66 becomes big.Certainly, low-voltage tube 65a be connected with shell 64 also form flat pattern foremost.

Although in above-mentioned first embodiment to the, four embodiments, body 4 is by die casting forms to aluminum alloy, and described body 4 can form injection moldings such as resins by using the separable mould of above-mentioned three-dimensional.Polyphenylene sulfide (PPS) with good heat resistance, mechanical property etc. is used as the material of resin body.In this case, be mixed with such material in the resin, described material makes the noise that produces in body can not transfer to the outside.

In described expansion valve, when flowing through narrow crack between valve seat and the valve element, refrigeration agent can produce noise.This mobile noise outwards sends with abnormal sound, if but the material of body is an aluminum alloy, thereby then its sound insulation and sound-absorbing effect enough height can prevent from outwards to send and be considered to tedious noise.Yet when the material of body was resin, its sound insulation and sound-absorbing effect were compared aluminum alloy and not really high.Just because this, in resin hybrid density greater than resin such as the metallic dust of iron, brass or copper or the material the steel fiber.Thereby the energy of the mobile noise that produces from valve portion is weakened by metallic dust the body or steel fiber, can reduce the sound pressure level of the mobile noise that sends from body like this.

In expansion valve according to the present invention, body uses shaping die and forms, and ingress port, outlet port, the hole, the valve opening that are used for receiving valve element and set point adjustment member within it, helical thread portion and the body that is used for receiving the hole of a member (this member will transfer to described valve element according to the actuation force of executive component sensed temperature) within it and is used to be connected described executive component form thus.Its advantage is: body no longer needs processing, and can improve the manufacturing efficient of body thus, has improved the quantum of output of material, and has reduced the manufacture cost of expansion valve.

And, in executive component, be connected to the housing that is formed at the helical thread portion on the body by forming, make inner periphery displacement continuously vertically in of central opening of this housing, thereby can form this housing by compacting less than the angular ranges of 360 degree with a circle worm structure.This makes the processing needn't be used for screw cutting, and has further reduced the manufacture cost of expansion valve thus.

The above should be regarded as merely the example to the principle of the invention.And, because those skilled in the art is easy to carry out numerous modifications and variations, so be not intended to the present invention is limited to definite structure and the application that illustrates and describe, therefore, all suitable modifications and equivalent can be considered to fall into of the present invention in the scope of claims and equivalent thereof.

Claims

1. expansion valve, described expansion valve transmits the refrigeration agent of introducing through being arranged on valve portion in the described expansion valve so that the refrigeration agent of being introduced is carried out throttling and expansion,

Wherein, the body that holds described valve portion is connected to helical thread portion on the described valve portion by using shaping die to form with executive component.

2. expansion valve according to claim 1, wherein, described body forms and makes that the axis of the ingress port be used to introduce refrigeration agent is identical or parallel to each other with the axis of the outlet port of the refrigeration agent that is used to carry expansion, and make and to be used for first hole of receiving valve element and set point adjustment member within it, valve opening, and be used for receiving second hole that will be passed to the member of described valve element within it and be arranged on same axis with the axis normal of the axis of described ingress port or described outlet port according to the actuation force of described executive component sensed temperature, and have the respective diameters that reduces with the order of mentioning, and wherein said helical thread portion is formed on the periphery of the hollow barrel-type part that limits described second hole.

3. expansion valve according to claim 2, wherein, described helical thread portion forms partial screw threads, and the part towards with the perpendicular direction of the same surface of the axis of the axis of the axis that comprises described ingress port, described outlet port and described valve opening or parallel surfaces of wherein said hollow barrel-type part outer circumferential face does not form screw thread.

4. expansion valve according to claim 1, wherein, described body forms and makes the axis and being used to of the ingress port be used to introduce refrigeration agent carry the axis of outlet port of the refrigeration agent of expansion comprising on the same plane of described axis or vertical mutually from perpendicular to the plane-parallel direction observation that comprises described axis respectively the time, and make described ingress port or described outlet port, valve opening, and be used for receiving the hole that will be passed to the member of described valve element within it and be arranged on same axis according to the actuation force of described executive component sensed temperature, and have the respective diameters that reduces with the order of mentioning, and wherein said helical thread portion is formed on the periphery of the hollow barrel-type part that limits described hole.

5. expansion valve according to claim 4, wherein, described helical thread portion forms partial screw threads, and the part towards with the perpendicular direction of the same surface of the axis of the axis of the axis that comprises described ingress port, described outlet port and described valve opening or parallel surfaces of wherein said hollow barrel-type part outer circumferential face does not form screw thread.

6. expansion valve according to claim 1, wherein, described executive component have one the circle screw thread, this thread-shaped become make the housing central opening be connected with on described helical thread portion one side inner periphery less than 360 the degree angular ranges in displacement continuously vertically.

7. expansion valve according to claim 1, wherein, described executive component have by the housing central opening that bends inwards at the pipe box that forms in interior week that is connected with on described helical thread portion one side, and the inner peripheral surface of described pipe box is formed with screw thread.

8. expansion valve according to claim 1, wherein, described body is as described shaping die metal to be carried out die casting by the mould that use has a three-dimensional separable structure to form.

9. expansion valve according to claim 1, wherein, described body is to use mould with three-dimensional separable structure to form by the resin die casting as described shaping die.

10. expansion valve according to claim 9, wherein, described resin is mixed with metallic dust or the steel fiber of density greater than described resin within it.

11. expansion valve according to claim 1, wherein, described expansion valve is a thermostatic expansion valve, in described thermostatic expansion valve, described body and described executive component are arranged on from vaporizer and extend to the low-voltage tube of compressor, establish the connection to the evaporator inlet pipe of the connection of the high-voltage tube that the supply of the paramount compacting cryogen of ingress port passes through and outlet port in described low-voltage tube, the refrigeration agent of expansion is carried to described vaporizer by this evaporator inlet pipe.

12. expansion valve according to claim 11, described expansion valve comprises heat-insulating cover, and described heat-insulating cover is configured to cover the external casing of described executive component.