KR20090123573A - Low noise type electronic expansion valve with a disk bellows - Google Patents

Abstract

PURPOSE: A low noise type electronic expansion value having a built-in disc bellows is provided to improve rigidity of a metallic cylindrical can receiving a multi-stage gear and a step motor, thereby reducing vibration and tightly closing the can and a case body. CONSTITUTION: A low noise type electronic expansion value comprises a case part(10), a disc bellows(40), and a positioner main body(30). The case part comprises a can(13) where a ring type projection(131) is formed in an upper side. The disc bellows is bonded in a valve body guide surface(54) formed in an inner diameter side of a valve body(50) together with a disc bellows supporting ring(41). An end of an outer circumference of the disc bellows supporting ring is fixed to an upper part of the valve body. Therefore, the insides of a case body and the can are close tightly. The positioner main body is combined in the case body(11), and has a positioner holder(32). A positioner(33) passes through the positioner holder.

Description

Low noise type electronic expansion valve with a disk bellows

The present invention relates to a low noise type electronic expansion valve with a built-in disk bellows, and more particularly, is used in a refrigerator or an air conditioner to linearly control the flow rate of a flow refrigerant in a valve chamber and to easily evaporate a high pressure refrigerant. It relates to a low-noise type electronic expansion valve with a built-in disc bellows that can be squeezed and reduced pressure to atomize the liquid refrigerant.

In general, an electronic expansion valve is used for a high efficiency heat pump, an air conditioner, and an air conditioner, and controls a flow rate of a refrigerant flowing into a valve chamber by driving a step motor.

1 is a view for explaining a conventional "electric valve" registered in the Republic of Korea Patent Publication No. 10-2006-0073427, the electric valve is a valve body having a valve chamber 200A and valve seat 200B The valve part 200 which consists of 200C, the valve body 200D equipped in the valve body 200C, the valve rod 200E which operates the valve body 200D, the valve chamber 200A, and a valve | bulb A bellows 300 for sealing between the inside of the rod 200E; The can 100A of metal containing the screw rod 400 for converting the rotational motion to the linear motion, the electric motor, the gear reduction device for decelerating and transmitting the output of the electric motor to the screw rod 400, and the can ( 100 A of openings 100B of 100 A, the seal structure member 100C which seals the opening 100B of the can, and a part of 100 A of seal structure members 100C which seal the opening 100B of the can 100A can 100A. It is characterized by consisting of the can portion 100 consisting of a high pressure opening (100D) for opening the high pressure inside.

However, as described above, since the upper end of the metal can 13 is flat in the conventional expansion valve, when the valve flow path is opened, the noise of the refrigerant flows with the natural frequencies of the motor and the reduction gear, which causes resonance.

In addition, the bellows 300 is integrally fixed to the valve rod 200E by welding, and is bonded along the outer periphery of the lower end of the valve rod 200E and the bellows 300 to seal the inside of the can 100A. To increase the manufacturing cost, and also to increase the manufacturing cost, and also the opening 100B of the can 100A is fixed by caulking using the seal structure member 100C to seal the member 100C. There is a problem in that a separate jig must be used to fix the position of the assembly.

In addition, there is a problem in that the resonance phenomenon caused by the longitudinal vibration generated based on the outflow pipe at the time of opening the flow path of the expansion valve and the vortex of the fluid is generated around the poppet valve to amplify the refrigerant flow noise.

In order to solve the above problems, in the present invention, the upper surface of the can is processed into various types of irregularities to reduce vibration of the step motor and the multi-stage gear, and to open the case body in the method of fixing the can to the case body. By installing a projection groove on the outer periphery, the case body and the can are sealed together by simply bending the can without using a separate jig to hold the circular sealing position.The disc bellows is provided in the inner groove of the positioner holder. Therefore, the refrigerant in the valve chamber is blocked from flowing into the can. In addition, the poppet valve head groove converts the longitudinal vibration at the time of opening the expansion valve flow path into the lateral vibration to mitigate resonance, and forms a low noise cross-through hole crossing at right angles to the circumferential surface of the poppet valve to form the poppet valve head. It is an object of the present invention to provide a low-noise type electronic expansion valve with a built-in disc bellows that can more effectively mitigate the noise of the whole valve than the groove alone.

A configuration for achieving the object includes a drive unit driven by a step motor, a multistage gear unit for slowing the output of the drive unit, a can and a case body for sealing the drive unit and the multistage gear unit, and the multistage gear unit. An electronic body having a positioner main body which receives the output and transmits the valve seat to the poppet valve to open and close the valve seat, a disk bellows integrated with the poppet valve to open and close the flow path, and a disk bellows support ring for fixing the disk bellows to the valve body. An expansion valve, comprising: a case body outer periphery protrusion formed at an outer circumferential surface having an opening at an upper portion thereof, a square protrusion groove formed toward an inner diameter side at a lower side of the case body outer periphery protrusion portion, and a circular seal inserted into the square protrusion groove; The can bent portion bent the inner end of the can is bent while surrounding the circular sealing is formed therein, A case part comprising a can formed with a ring-shaped protrusion on an upper surface thereof so as to reduce noise and vibration generated from the upper surface; A disc bellows which is formed by being joined together with a disc bellows support ring to the valve body guide surface formed on the inner side of the valve body so that the can and the case body are sealed, and the outer end of the disc bellows support ring is fixed to the upper part of the valve body; It is coupled to the case body, the positioner body portion consisting of a positioner holder through which the positioner penetrates is configured.

The can is characterized in that not only the annular protrusion, but also the spiral protrusion or the cross-shaped protrusion are formed on the upper surface to reduce the noise and vibration generated inside the can.

Particularly, the disk bellows is bent downward through the valve body and bent upwardly with the inner circumferential surface of the through-center portion joined to the upper outer circumferential surface of the poppet valve rod, and the disk bellows outer circumferential surface joined integrally with the disk bellows support ring and the poppet valve by the movement of the positioner. Poppet valve head is composed of several semi-circular projection grooves with elasticity in concentric shape so that the poppet valve head can be attached to the valve seat through a rod. In addition, the disk bellows is formed of a phosphor bronze metal sheet material having a soft elasticity so that the positioner moves in conjunction with the pressing surface of the poppet valve.

The poppet valve has a poppet valve head through hole formed in a vertical surface of the step of the poppet valve head for smooth flow of residual refrigerant around the poppet valve rod when the valve flow path is opened.

In addition, by forming a poppet valve head groove for mitigating the resonance generated during operation of the expansion valve by converting the longitudinal vibration generated on the basis of the outflow pipe when opening the flow path of the expansion valve to the horizontal vibration, and the fluid around the poppet valve To reduce the amplification of the refrigerant flow noise due to the vortex of air, low noise cross-throughs are formed on the circumferential surfaces of the end of the poppet valve head at right angles to each other. Noise can be reduced.

As a feature of the present invention, the step motor and the multi-stage gear part are accommodated in the can, and the vibration generated by the rotation of the motor is transmitted to the upper plane of the can to generate resonance noise, and thus the present invention is different from the step motor. Vibration can be attenuated by providing a projection in the upper end plane of the metal cylindrical can accommodating the short-term fisherman to improve the rigidity of the can. In addition, the lower end portion of the can is fixed in a bent form with a circular sealing in the protrusion groove formed on the outer periphery of the upper case of the main body body can also reduce the number of assembly jig.

The valve body is coupled to the inner position of the positioner holder, but a rectangular sealing is formed between the two to prevent foreign matter from entering the valve, the valve body is formed at a right angle at the bottom to the inlet and outlet pipes to the valve chamber. Is formed. In particular, the poppet valve head moves upward and downward in the valve seat formed at the bottom of the valve body to form a wider or narrower distance, thereby controlling the flow rate of the refrigerant passing through the valve chamber.

In addition, the disk bellows return the closed poppet valve to the open state as shown in FIG. 2, as shown in FIG. 3, and the inner circumferential surface of the through-center of the disk bellows is joined to the outer circumferential surface of the upper end of the poppet valve rod to the positioner when the positioner is decompressed. The poppet valve head is returned to the open state by pushing the poppet valve head by the elastic restoring force of the disk bellows which is elastically extended by the disk bellows.

Particularly, the poppet valve head groove portion converts the longitudinal vibration generated from the discharge pipe when opening the expansion valve flow path to the horizontal vibration to mitigate the resonance generated when the expansion valve is operated. In order to reduce the amplification of the refrigerant flow noise, the low noise cross-through hole is formed on the circumferential surface of the poppet valve head end at right angles to each other. The noise of the whole valve can be alleviated.

In addition, the poppet valve head is formed with a plurality of through holes for smooth entry and exit of the refrigerant into the valve chamber on the stepped vertical surface, so that the poppet valve head is switched from the bottom to the top by the disc bellows by the through holes. The refrigerant remaining in the movement is to ensure that the poppet valve head is returned to the top smoothly.

The present invention not only enhances the sealing effect in a simpler form than a conventional bellows refrigerant seal structure by providing a disk bellows in the inner groove of the positioner holder, but also reduces workaround by reducing the bead fusion area than the conventional bellows. This reduces the production efficiency.

As described above, the present invention includes a projection on the top surface of the metal cylindrical can housing the step motor and the multi-stage gear to improve the rigidity of the can, thereby damping vibrations, and the bent portion is formed on the outer periphery of the case body. Being fixed but bent in the form of enclosing the projection groove in which the circular seal is inserted into the outer periphery of the case body, the can and the case body can be sealed without being fixed using a separate jig, and the disc bellows in the inner groove of the positioner holder. It is designed to have a simpler structure than the conventional bellows type expansion valve to reduce the cost and time required for processing and assembly, and the refrigerant in the valve chamber flows into the can due to the disc bellows provided in the inner groove of the positioner holder. It has the effect of blocking.

In addition, the poppet valve head groove portion mitigates the resonance generated during operation of the expansion valve by converting the longitudinal vibration generated from the outflow pipe into the horizontal vibration when the expansion valve flow path is opened, and at the circumferential surface of the end of the poppet valve head Forming a low noise cross-through hole that crosses at right angles to each other to send the fluid can reduce the noise of the entire valve more efficiently than the sole role of the poppet valve head groove.

In addition, a plurality of through holes are formed in the poppet valve head to facilitate the inflow and out of the refrigerant into the valve chamber, and the refrigerant remaining around the poppet valve rod in the process of changing the poppet valve head from the lower part to the upper part by the disk bellows is formed in the through hole. By moving through the poppet valve head has the effect of returning smoothly to the top.

2 is a cross-sectional view of a low noise electronic expansion valve with a built-in disc bellows according to the present invention, Figure 3 is a cross-sectional view of the use state of a low noise electronic expansion valve with a built-in disc bellows according to the present invention.

Figure 4 (a) is a cross-sectional view of the poppet valve of the low-noise type electronic expansion valve with a built-in disc bellows according to the present invention, Figure 4 (b) is a poppet valve of the low-noise type electronic expansion valve with a built-in disc bellows according to the present invention Top view of the.

5 (a) is a plan view and a sectional view of a can of a low noise type electronic expansion valve with a built-in disk bellows according to the present invention, Figure 5 (b) is a plan view and a sectional view of a can according to another embodiment according to the present invention 5C is a plan view and a cross-sectional view of a can according to another embodiment according to the present invention.

Figure 6 (a) is a cross-sectional view of the disk bellows according to the present invention, Figure 6 (b) is an enlarged cross-sectional view according to another embodiment of the disk bellows according to the present invention, Figure 6 (c) is a disk bellows according to the present invention In accordance with another embodiment of the enlarged cross-sectional view.

Hereinafter, the components of the present invention and its operation will be described with reference to the drawings.

Low noise type electronic expansion valve with a built-in disk bellows of the present invention, is coupled to a multi-stage gear portion 20 is connected to the step motor 17 for generating power by electrical energy to rotate, the upper surface is annular The lower opening 16 and the lower opening 16 for accommodating the can 13 of the metal material having the protrusion 131 and the inside of the can 13 are sealed to the lower end to accommodate the positioner body part 30. Positioner 33 penetrating the positioner holder 32 is tightly coupled to the inside is coupled to the multi-stage gear portion 20, the case portion 10 consisting of a positioner body portion 30 for changing the rotational movement into a linear movement and In addition, the positioner main body 30 is vertically moved by the Nurum action of the poppet valve unit 60 to control the flow of the refrigerant.

In particular, the disk bellows 41 is formed at the bottom of the positioner holder 32 in order to prevent the refrigerant introduced into the valve body 50 from flowing into the can 13.

As shown in FIG. 2, the can 13 and the case body 11 are driven by the multi-stage gear part 20 and the step motor 17, and the lower end of the can 13 is the upper part of the case body 11. The outer circumferential protrusion 18 is bent outwardly and then fixed by being bent in a form to surround the case body 11 and the outer circumferential square protrusion groove 15 in which the circular sealing 14 is inserted. Therefore, the circular sealing 14 is inserted into the outer circumferential square protrusion groove 15 in which the rectangular space of the case body 11 is formed, thereby effectively sealing the intrusion of foreign matter into the can 13 and the case body 11. .

In addition, the can 13 and the case body 11 may include a first gear 21, a second gear 22, a third gear 23, and a fourth gear 24 to a step motor 17 that provides power therein. ), The fifth gear 25, the sixth gear 26 consisting of the sixth gear 26 is connected in order to rotate, the sixth gear 26 is the positioner 33 is coupled to the center thereof together Rotate

In addition, since the annular protrusion 131 is formed on the upper surface of the can 13, the rigidity of the can can be improved to attenuate natural vibrations of the step motor and the multi-stage gear.

As shown in FIGS. 5B and 5C, the protrusions of the spiral protrusions 132 and the cross-shaped protrusions 133 may reduce the noise by attenuating such vibrations.

Positioner body portion 30 is coupled to the multi-stage gear portion 20, the positioner 33 is formed with an external thread 342 on the outer periphery, and coupled to the inner side of the lower opening 16 of the case body 11 and the central through portion The positioner holder 32 includes a positioner holder 32 having a positioner main body female screw 341 formed therein, and a protrusion 35 projecting in a semicircular shape on the lower surface of the positioner 33.

The positioner 33 is formed through the center of the positioner holder 32. The male screw 342 formed outside the positioner 33 is coupled to the positioner main body female screw 341 formed inside the positioner holder 32 to form a sixth gear. The rotational motion by 26 is converted into a linear motion.

 In particular, a positioning E-ring (not shown) is attached to the upper end and the lower end of the positioner 33 to prevent the position of the assembly of the sixth gear 26 from the positioner 33, and the positioner 33 is Even if the lift peak is exceeded, departure from the position assembled with the positioner holder 32 is prevented.

In addition, in the positioner body portion 30 coupled to the case body 11 lower portion of the positioner holder inner groove 321, the outer peripheral lower end of the positioner holder 32, a square projection for installing a metal square support ring 37 322, and the metal support ring 37 for supporting the position of the hexagon nut 36 is installed in the square protrusion 322. The metal support ring 37 is supported on the inner diameter side step portion 361 of the hexagon nut 36, the hexagon nut 36 is free to perturb in the circumferential direction and the case body 11 direction, the valve body ( 32) It is fastened with the male thread processed on the upper part. The hexagon nut 36 includes a case main body 11 accommodating the multi-stage gear part 20, the positioner main body part 30, a disc bellows support ring 41, a disc bellows 40, and a poppet valve part 60. Coupling the valve body 50 to accommodate the integrally.

The disc bellows support ring 41 is mounted on the upper stepped guide surface 54 of the valve body 50 to fix the disc bellows 40 at an appropriate position inside the valve body 50. In addition, the disk bellows support ring 41 is fixed in a form in which the upper surface is covered with solder along the valve body vertical circumferential surface 55 perpendicular to the upper guide surface 54 of the valve body 50, as shown in FIG. 2. Thus, the disk bellows 40, the disk bellows support ring 41, and the poppet valve 61 can be easily assembled. A disc bellows support ring square groove 57 for supporting the disc bellows 40 is installed on the bottom surface of the disc bellows support ring 41. The curved outer circumferential surface of the disc bellows 40 is inserted into the disc bellows support ring square groove 57, and the disc bellows support ring 41 and the disc bellows 40 are joined by low brazing. The disk bellows 40 is configured such that the inner circumferential surface 42 of the penetrating central portion is inserted into the upper outer circumferential surface 641 of the poppet valve rod 64, and the inner circumferential surface 42 of the central portion of the disk bellows 40 and the poppet valve rod ( 64) while being in contact with the upper outer circumferential surface 641 of the protruding step portion (643) by low brazing. At this time, the end surface of the disk bellows inner circumferential surface 42 is formed in an appropriate position by being mounted on the poppet valve head vertical step surface 634 of the poppet valve rod protrusion step portion 643. In addition, the poppet valve rod protrusion step part 643 and the disc bellows support ring 41 allow the disc bellows 40 to be installed at an optimum initial position, while the disc bellows support ring 41 and the disc bellows ( 40) By treating the poppet valve 60 as an integrated module, it is possible to effectively arrange and assemble parts for valve opening and closing in a narrow space.

Meanwhile, the semicircular positioner protrusion 35 protruding from the positioner 33 ends when the positioner 33 is lowered by the linear movement, and then the poppet valve protrusion ground 642 positioned on the top of the poppet valve rod 64. The disk bellows 40 integrally bonded with the poppet valve rod 64 is pressed, and the semi-circular semicircular protrusion 44 is extended to about several hundred micrometers while the poppet valve 60 is displaced downward. I will go. Then, the flow rate of the refrigerant through the valve chamber 53 is controlled while the gap between the poppet valve head 63 and the valve seat 51 formed integrally with the poppet valve rod 64 is adjusted.

Hereinafter, the operation method of the low noise type electronic expansion valve in which the disc bellows is built will be described.

 The valve body 52 is coupled to the positioner holder inner groove 321 portion between the two is formed with a rectangular sealing 38 to prevent foreign matter from entering the outside of the valve body, the valve body 52 is perpendicular to the lower portion The inlet pipe 81 and the outlet pipe 82 which are formed and communicate with the valve chamber 53 are formed. In particular, the poppet valve head 63 moves up and down in the valve seat 51 formed at the bottom of the valve body 52 to form a wider or narrower distance, thereby controlling the flow rate of the refrigerant passing through the valve chamber 53.

In addition, when the disc bellows 41 returns the closed poppet valve 61 to an open state as shown in FIG. 2, as shown in FIG. 3, the inner circumferential surface 42 of the penetrating central portion of the disc bellows 40 has a poppet valve rod ( 64 is pushed up by the poppet valve head 63 by the elastic recovery force of the disk bellows 40 which has been compressed by the positioner 33 when the positioner 33 is decompressed. To return.

In particular, as shown in (a) and (b) of FIG. 4, the poppet valve head groove 632 is expanded by converting the longitudinal vibration generated based on the outflow pipe 82 when the expansion valve flow path is opened to the transverse vibration. Mitigates the resonance generated when the valve is operated. In addition, when the flow path of the expansion valve is opened, the vortex of the fluid is generated with attention to the poppet valve head 63 so as to cross the perpendicular to the circumferential surface of the end of the poppet valve head 63 to reduce the amplification of the refrigerant flow noise. When the low noise cross-through hole 633 is formed to send the fluid, the noise of the entire valve can be alleviated more efficiently than the sole role of the poppet valve head groove 632.

An inclined poppet valve head triangular groove 635 is provided on the outer peripheral surface of the end of the poppet valve head 63 to provide a buffering function against cavitation caused by sudden pressure fluctuations occurring at the time of opening the valve flow path. This is due to the property that a streamlined flow line of fluid is intended to flow along the inclined poppet valve head triangular groove 635. In addition, the poppet valve head vertical stepped surface 634 is formed with a plurality of poppet valve head through holes 631 for smoothly entering and exiting the refrigerant into the valve chamber 53. The poppet valve head through hole 631 is a refrigerant remaining around the poppet valve rod 64 while the poppet valve head 63 is switched from the bottom to the top by the disk bellows 40. The poppet valve head 63 is smoothly returned to the top by being moved through the 631.

As seen from the above, the present invention includes a disk bellows 40 in the positioner holder inner groove 321 to increase the sealing effect in a simpler form than the conventional bellows refrigerant sealing structure, and also to bead fusion than the conventional bellows. Since the disk bellows 40 is fixed by reducing the area, the work maneuver is reduced and the production efficiency is improved.

In addition, by forming the annular projection 131 on the upper surface of the can 13, the natural vibration of the step motor 17 and the multi-stage gear portion 20 can be attenuated to reduce noise, and the upper portion of the can 13 The surface is characterized in that it includes not only the annular projection 131 but also the spiral projection 132 and the cross-shaped projection 133 shape. And the lower end of the can 13 is fixed in a form bent together with the circular sealing 14 in the projection groove 15 formed on the outer periphery of the upper opening of the case body 11 can reduce the number of assembly jig.

In addition, the portion of the poppet valve head groove 632 mitigates the resonance generated during operation of the expansion valve by converting the longitudinal vibration generated based on the outflow pipe 82 when the expansion valve flow path is opened to the horizontal vibration, wherein the poppet In order to reduce the amplification of the fluid flow noise due to the vortex of the valve 61, the low noise cross-through hole 633 is formed on the circumferential surface of the end of the poppet valve head 63 so as to cross at right angles. By sending a more efficient than the sole role of the poppet valve head groove 632 can alleviate the noise of the entire valve.

In addition, the poppet valve head vertical stepped surface 634 is around the poppet valve rod 64 in the process of switching from the bottom to the top by the disk bellows 40 for smoothly entering and exiting the refrigerant into the valve chamber 53. The remaining refrigerant is to be moved through the low noise cross-through port 633 so that the poppet valve head 63 is smoothly returned to the upper portion.

The present invention is not limited to the preferred embodiments of the above features, and those skilled in the art to which the present invention pertains various modifications without departing from the gist of the present invention as claimed in the claims. Of course, such changes are intended to fall within the scope of the claims.

1 is a cross-sectional view showing an electric valve according to the prior art.

Figure 2 is a cross-sectional view of a low noise electronic expansion valve with a built-in disk bellows according to the present invention.

Figure 3 is a cross-sectional view of the use state of the low-noise type electronic expansion valve built-in disk bellows according to the present invention.

Figure 4 (a) is a cross-sectional view of the poppet valve of the low-noise type electronic expansion valve with a built-in disc bellows according to the present invention, Figure 4 (b) is a poppet valve of the low-noise type electronic expansion valve with a built-in disc bellows according to the present invention Top view of the.

5 (a) is a plan view and a sectional view of a can of a low noise type electronic expansion valve with a built-in disk bellows according to the present invention, Figure 5 (b) is a plan view and a sectional view of a can according to another embodiment according to the present invention 5 (c) is a plan view and a cross-sectional view of a can according to another embodiment according to the present invention.

Figure 6 (a) is a cross-sectional view of the disk bellows according to the present invention, Figure 6 (b) is an enlarged cross-sectional view according to another embodiment of the disk bellows according to the present invention, Figure 6 (c) is a disk bellows according to the present invention Enlarged cross-sectional view according to another embodiment of the.

           <Description of the symbols for the main parts of the drawings>

 10: case part 11: case body

 12: can bent portion 13: can

 131: ring projection 132: spiral projection

 133: cross projection 14: circular sealing

 15: square projection groove 16: the lower opening of the case body

 17: step motor 18: the outer peripheral protrusion of the case body

 20: multi-stage gear part 21: first gear

 22: second gear 23: third gear

 24: 4th Gear 25: 5th Gear

 26: 6th Gear 30: Positioner Main Body

 32: positioner holder 321: positioner holder inner groove

 322: positioner holder square projection 33: positioner

 341: positioner main body female thread 342: positioner male thread

 35: positioner protrusion 36: hexagon nut

 361: Hex nut inner diameter side step portion 37: Square support ring

 38: square sealing 40: disc bellows

 41: disc bellows support ring 42: inner surface of the disc bellows

 43: outer peripheral surface of the disk bellows 44: semi-circular projection

 50: valve body 51: valve seat

 53: valve chamber 54: valve body guide surface

 55: valve body vertical circumferential surface 56: valve body male threaded portion

 57: disc bellows support ring square groove 60: poppet valve

 63: poppet valve head 631: poppet valve head through-hole

 632: poppet valve head groove 633: low noise cross-through hole

 634: poppet valve head vertical step surface 635: poppet valve head triangular groove

 64: poppet valve rod 641: outer peripheral surface of the poppet valve rod

 642: poppet valve projection base 643: poppet valve rod protrusion step

 81: inlet 82: outlet

Claims (6)

A drive unit driven by the step motor 17, a multistage gear unit 20 for slowing the output of the drive unit, a can 13 and a case body 11 for sealing the drive unit and the multistage gear unit 20; The positioner body part 30 which receives the output of the multi-stage gear part 20 and delivers it to the poppet valve 60 to open and close the valve seat 51, and a disk which is integrated with the poppet valve 30 to open and close the flow path. In the electronic expansion valve having a bellows (40) and a disc bellows support ring (41) for fixing the disc bellows (40) to the valve body (50), In the case body outer periphery protrusion 18 formed of the outer peripheral surface with an opening formed in the upper portion, a square protrusion groove 15 formed toward the inner diameter side of the case body outer periphery protrusion 18, and the square protrusion groove 15 The inserted circular sealing 14 and the can bent part 12 having the lower end of the can 13 bent inward while surrounding the circular sealing 14 are formed, and the upper part so as to reduce the noise and vibration generated therein. A case portion 10 formed of a can 13 having an annular protrusion 131 formed on a surface thereof; The cans (13) and the case body (11) inside the valve body 52 formed on the valve body guide surface 54 formed on the inner diameter side of the case body 11 to be sealed together with the disc bellows support ring 41 is formed and the disc bellows support ring ( 41) a disk bellows 40 having an outer circumferential end fixed to an upper portion of the valve body 52, The low-noise type electronic expansion valve having a disc bellows is coupled to the case body (11), and is coupled to a positioner body portion (30) consisting of a positioner holder (32) through which the positioner (33) passes. The method of claim 1, The can 13 is a low noise electronic expansion valve with a built-in disk bellows, characterized in that the spiral projection 132 is formed on the upper surface to reduce the noise and vibration generated therein. The method of claim 1, The can 13 is a low-noise type electronic expansion valve with a disc bellows, characterized in that a cross-shaped projection 133 is formed on the upper surface to reduce the noise and vibration generated therein. The method of claim 1, The disc bellows 40 has a disc bellows inner circumferential surface 42 which is bent downwardly through the center portion of the disc bellows to be brazed to the upper outer surface 641 of the poppet valve. A disk bellows outer circumferential surface 43 that is bent upward by being brazed to the disk bellows support ring square groove 57; Between the inner circumferential surface 42 of the disk bellows and the outer circumferential surface 43 of the disk bellows, the poppet valve head 63 is composed of a plurality of semicircular projections 44 that are elastic in a concentric shape such that the poppet valve head 63 is detached from the valve seat 51. Low noise type electronic expansion valve with built-in disc bellows. The method of claim 4, wherein The disc bellows 40 is a low noise type, characterized in that the disc bellows can be adjusted by varying the number of bending, the position of the bending, the radius of curvature of the bending of the concentric semi-circular projection groove 44 Electronic expansion valve. The method of claim 1, The disk bellows 40 is a low-noise type electronic expansion valve with a built-in disk bellows, characterized in that formed of a phosphor bronze metal sheet material having a soft elasticity so as to move in conjunction with the poppet valve (60).

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