JP2006057779A - Valve device and refrigeration cycle device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely install a ceramic valve seal member and a valve element with high reliability and durability without causing breakage such as cracking, and deterioration with age such as rattling of a valve housing and a valve stem member. <P>SOLUTION: In this valve device, a valve seat member receiving hole 41 having a bottomed structure is formed on the metallic valve housing 11 for receiving the ceramics valve seat member 21. The valve seat member 21 is inserted into the valve seat member receiving hole 41 to fix the valve seat member 21 to the valve housing 11 by caulking a caulking piece 43 formed on an opening edge part of the valve seat member receiving hole 41. Further a plastic deformation ring member 45 composed of a material of hardness lower than that of a material of the valve housing 11, is held between the caulking piece 43 and the valve seat member 21. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a valve device, and more particularly, to a ceramic valve seat member and a structure for assembling these ceramic parts in a valve device using a valve body.

  In the refrigeration cycle apparatus using ammonia refrigerant, if the valve body such as an expansion valve and the valve seat part incorporated in the refrigerant circuit are made of a conductive metal such as stainless steel or iron, local battery action occurs, and electrochemical As a countermeasure against this, erosion due to mechanical corrosion and cavitation erosion has occurred, and it has already been proposed that the valve body and valve seat be made of ceramics, or that the surface of the valve body and valve seat be coated with ceramics by vapor deposition, etc. (For example, Patent Document 1).

  In the case of a ceramic valve seat member or valve body, these are assembled as a fired part to a metal valve housing or valve stem member (valve shaft member).

  Ceramic parts are more fragile and more brittle than metal parts, so ceramic valve seat members and valve bodies can be rattled against valve housings and valve stem members without causing damage such as cracks. There is difficulty in assembling firmly without occurring.

  On the other hand, the ceramic valve body is held by a metal valve body holding member (connecting member), and the valve body holding member and the valve stem member (valve stem) are fastened to each other by screw connection. It has been proposed to sandwich an elastically deformable cushion member between the back surface of the body and the tip surface of the valve stem member (for example, Patent Document 2).

  However, there is a concern that the screw connection is likely to be loosened due to repeated impacts, changes with time, and repeated temperature cycles that occur when the valve body is in contact with the valve seat, and the valve body comes off.

  If the cushion member is a sheet that can be elastically deformed by an expanded graphite sheet or the like, a sealing effect can also be expected. However, the cushion member sags due to repeated impacts, changes with time, and repeated temperature cycles. It is conceivable that the properties and sealing properties cannot be maintained.

Due to the dimensional variation of each part and the dimensional variation of the cushion member in the compression direction, and because the cushion member is a thin sheet, the screwing torque must be strictly controlled to produce the necessary cushion effect. . Specifically, it should be a tightening torque that does not impair the cushioning effect and sealing performance even if there are any variations or changes in the environment of use, and a tightening torque that does not cause cracking of ceramic parts due to overtightening. is there.
JP 2003-307370 A JP-A-8-338550

  The problem to be solved by the present invention is that the ceramic valve seat member and the valve body do not cause breakage such as cracking, and the valve housing and valve stem member do not change with time such as rattling, Reliable, durable, and securely assembled.

  The valve device according to the present invention has a valve seat member receiving hole having a bottomed structure for receiving the valve seat member in the valve housing in a valve device having a ceramic valve seat member attached to the valve housing in the valve chamber. The valve seat member is inserted into the valve seat member receiving hole, and the valve seat member is squeezed by caulking pieces formed on the opening edge portion on the side opposite to the bottom side of the valve seat member receiving hole. The valve housing is fixed, and a plastic deformation ring member made of a material having a hardness lower than that of the material constituting the valve housing is sandwiched between the caulking piece and the valve seat member.

  In the valve device according to the present invention, preferably, the valve housing is made of an iron-based metal, and the plastic deformation ring member is made of an aluminum-based metal.

  The valve device according to the present invention is preferably provided with a seal structure for hermetically sealing between the valve seat member and the valve housing in the valve seat member receiving hole. The seal structure can be constituted by an elastic seal member sandwiched between the bottom portion of the valve seat member receiving hole and the valve seat member, or other adhesive.

  In the valve device according to the present invention, a valve body receiving hole having a bottom structure for receiving the valve body is formed in the valve stem member in a valve device having a ceramic valve body attached to the valve stem member in the valve chamber. The valve body member is inserted into the valve body receiving hole, and the valve rod member of the valve body is caulked by a caulking piece formed on an opening edge on the side opposite to the bottom side of the valve body receiving hole. The plastic deformation ring member made of a material having a hardness lower than the hardness of the material constituting the valve stem member is sandwiched between the caulking piece and the valve body.

  The valve device according to the present invention is a valve device having a valve body made of ceramics attached to a valve stem member in a valve chamber, and has a valve body mounting cylinder that accommodates the valve body inside the valve device. A body mounting cylinder is fixed to the valve stem member, and the valve body includes a lip piece at an end of the valve body mounting cylinder and an end face of the valve stem member in the valve body mounting cylinder. A plastic deformation ring member made of a material having a hardness lower than that of the material constituting the valve stem member is sandwiched between the end face of the valve stem member and the end face of the valve body opposite to the end face of the valve stem member. ing.

  In the valve device according to the present invention, preferably, the valve stem member is made of an iron-based metal, and the plastic deformation ring member is made of an aluminum-based metal.

  In the valve device according to the present invention, preferably, a spring member is provided between the valve rod member and the valve body to urge both of them in a direction away from each other in the axial direction.

  In the valve device according to the present invention, since the ceramic valve seat member and the valve body are fixed to the valve housing and the valve stem member by caulking, the fixed portion ( The caulking fastening portion is not loosened like the screw coupling portion, and a reliable assembled state with good reliability and durability can be easily obtained.

  Since the plastic deformation ring member is sandwiched between the caulking portions, the caulking load exceeding the elastic limit of the plastic deformation ring member is absorbed by the plastic deformation of the plastic deformation ring member, and the load exceeding the elastic limit of the plastic deformation ring member. Does not act on the ceramic valve seat member or valve body, so that the ceramic valve seat member or valve body can be securely caulked to the valve housing or valve stem member without cracking. it can.

  Further, unlike an elastically deformable member, a plastically deformable ring member, if it is a plastically deformable member, does not cause deterioration over time even when subjected to repeated impacts, changes with time, and repeated temperature cycles. A stable performance can be obtained.

  One embodiment of a valve device according to the present invention will be described with reference to FIGS. The valve device of this embodiment is a temperature type expansion valve for ammonia refrigerant.

  As shown in FIG. 1, the thermal expansion valve has a valve housing 11 made of a ferrous metal such as stainless steel or mild steel. In the valve housing 11, a valve chamber 12, an inlet port 13, and an outlet port 14 are formed. A plug member 15, flange joint members 16, 17, etc. are attached to the valve housing 11.

  A ceramic valve seat member 21 is fixed to the valve housing 11 by caulking at a portion corresponding to the ceiling of the valve chamber 12. The caulking structure of the valve seat member 21 will be described in detail with reference to FIGS.

  The valve seat member 21 is cylindrical and defines a valve port 22. On the one hand, the valve port 22 communicates with the inlet port 13 by internal passages 18, 19 formed in the valve housing 11. On the other hand, the valve port 22 is opened to the valve chamber 12 and communicates with the outlet port 14 via the valve chamber 12.

  In the valve chamber 12, a top-shaped ceramic valve body 25 is arranged. The valve body 25 is a fired ceramic part, and as the ceramic constituting the valve body 25, partially stabilized zirconia having high toughness, high strength, and difficulty in cracking is preferable.

  The valve chamber 12 has a compression coil spring (valve closed) in a state of being sandwiched between a spring retainer 26 engaged with the valve body 25 and an adjustment screw member 28 screw-engaged with the plug member 15 by a screw portion 27. Spring) 29 is provided.

  A temperature sensitive diaphragm device 31 is attached to the valve housing 11. The temperature-sensitive diaphragm device 31 includes an upper diaphragm chamber 33A and a lower diaphragm chamber 33B that are separated by a diaphragm 32. A connecting rod 35 for transmitting the displacement of the diaphragm 32 to the valve body 25 is attached to the valve housing 11.

  The upper diaphragm chamber 33 </ b> A is connected to the temperature sensing cylinder 34 and changes the internal pressure depending on the temperature sensed by the temperature sensing cylinder 34. The lower diaphragm chamber 33B communicates with the valve chamber 12 by a pressure equalizing passage 36 formed in the valve housing 11, is equalized to the internal pressure of the valve chamber 12, and the pressure on the outlet port 14 side (secondary pressure) is reduced. Affected.

  As a result, the valve body 25 is displaced according to the resultant force of the valve closing direction force due to the secondary pressure received by the lower side of the diaphragm 32 and the valve closing direction force due to the compression coil spring 29 and the temperature sensed by the temperature sensing cylinder 34. Due to the balanced relationship with the force in the valve opening direction by the diaphragm 32, the valve 32 moves up and down as seen in FIG. 1 to open and close the valve port 22 and increase or decrease the effective opening area.

  Next, the caulking structure of the valve seat member 21 will be described in detail with reference to FIGS.

  As shown in FIG. 2, the valve housing 11 is formed with a valve seat member receiving hole 41 having a circular cross section having a bottomed structure for receiving the valve seat member 21. The valve seat member receiving hole 41 communicates with the internal passage 18 on the bottom 42 side, opens to the valve chamber 12 on the side opposite to the bottom 42, and an annular lip-shaped caulking piece 43 is provided on the opening edge. It has been. The caulking piece 43 is a part of the valve housing 11 and is integrally formed with the valve housing 11.

  The valve seat member 21 has an outer diameter slightly smaller than the inner diameter of the valve seat receiving hole 41, a large diameter portion 21B having a tapered outer diameter portion 21A at the tip, and a small diameter portion 21C slightly smaller in diameter than the large diameter portion 21B. The whole is configured as a ceramic fired part. As the ceramic constituting the valve seat member 21, like the valve body 25, partially stabilized zirconia having high toughness, high strength, and hardly cracking is preferable among ceramics.

  The valve seat member 21 is a rubber which is an elastic seal member as an airtight seal member between the tapered outer diameter portion 21A and the bottom portion 42 of the valve seat member receiving hole 41 with the tapered outer diameter portion 21A first. A cylindrical plastic deformation ring (sleeve) member 45 is mounted on the outer periphery of the small-diameter portion 21 </ b> C with an O-ring 44 made of a cylindrical elastic material interposed therebetween, and is inserted into the valve seat member receiving hole 41.

  The plastic deformation ring member 45 is made of a plasticity material whose hardness is lower than the hardness of the material constituting the valve housing 11. Examples of the plastic material constituting the plastic deformation ring member 45 include a soft metal material, a porous metal such as foam metal, a wire mesh laminate, and other plastic resin materials.

  When the valve housing 11 is made of an iron-based metal such as stainless steel or mild steel, the plastic deformation ring member 45 is an aluminum-based metal such as a pure aluminum material or an aluminum alloy whose elastic limit is about 1/10 of that of the iron-based metal. It is preferable that

  The caulking piece 43 is caulked and deformed from the initial state shown in FIGS. 3 (a) and 4 (a) to the inner diameter side as shown in FIGS. 3 (b) and 4 (b). As a result, the valve seat member 21 is caulked and coupled to the valve housing 11 via the plastic deformation ring member 45. In FIG. 2, the caulking piece 43 shows the initial state before caulking on the left side, and the state after caulking on the right side.

  This caulking may be any one of caulking all around as shown in FIG. 4B and partial caulking as shown in FIG.

  In this caulking and coupling state, as shown in FIG. 2, the tip end surface of the tapered outer diameter portion 21A of the valve seat member 21 abuts against the bottom portion 42 of the valve seat member receiving hole 41, and the O-ring 44 is In the crushed elastic deformation state, the valve housing 11 is sandwiched between the tapered outer diameter portion 21 </ b> A of the valve seat member 21, the bottom 42 of the valve seat member receiving hole 41, and the inner peripheral surface of the valve seat member receiving hole 41. The valve seat member 21 is hermetically sealed.

  The plastic deformation ring member 45 is sandwiched between the step end surface 21D between the large diameter portion 21B and the small diameter portion 21C of the valve seat member 21 and the caulking deformed caulking piece 43, and receives the caulking load as an axial load. Thereby, the caulking load acts on the valve seat member 21 via the plastic deformation ring member 45.

  As described above, since the plastic deformation ring member 45 softer than these is clamped between the valve seat member 21 and the caulking piece 43 of the valve housing 11, the caulking load exceeding the elastic limit of the plastic deformation ring member 45 is Therefore, it is avoided that a load that is absorbed by the plastic deformation of the plastic deformation ring member 45 and exceeds the elastic limit of the plastic deformation ring member 45 acts on the ceramic valve seat member 21 in advance. Accordingly, the valve seat member 21 can be securely caulked and attached to the valve housing 11 without causing the valve seat member 21 to crack.

  Further, before the caulking, the smoothness of the step end face 21D of the valve seat member 21 is poor, and even if the valve seat member 21 and the plastic deformation ring member 45 are in contact only at two points, the valve housing is obtained by caulking. 11 and the plastic seat ring member 45, which is softer than the valve seat member 21, are plastically deformed by the caulking load, and the valve seat member 21 and the plastic deforming ring member 45 are uniformly contacted around the entire circumference, and the caulking load is uniformly applied to the entire circumference. Can be fixed in the hanging state.

  Thus, the valve seat member 21 can be used even in a state where the stepped end surface 21D with which the plastic deformation ring member 45 abuts is somewhat distorted while the ceramic seat member 21 is still fired. Secondary polishing after firing is not necessary, and component costs can be greatly reduced.

  Further, since the ceramic valve seat member 21 can be fixed to the valve housing 11 with a load uniformly applied to the entire circumference, stress concentration does not occur in the valve seat member 21 when the valve seat member 21 is mounted and used. Since an excessive load is not applied, the valve seat member 21 is not cracked and cracked, and the reliability of the mounting structure is improved.

  Specifically, when the caulking piece 43 made of steel is directly caulked without using the plastic deformation ring member 45, all of the caulking load is applied to the valve seat member 21, and the valve seat member 21 is partially Since it can only be pressed, the ceramics are easily cracked by stress concentration. On the other hand, when the valve housing 11 is a steel material and the plastic deformation ring member 45 is a pure aluminum material, the elastic limit of pure aluminum is about 1/10 of the elastic limit of the steel material, and the plastic deformation made of pure aluminum. When the ring member 45 is sandwiched and caulked with a load exceeding the elastic limit of pure aluminum, the plastic deformation ring member 45 is plastically deformed, and a load exceeding the elastic limit of pure aluminum does not act on the valve seat member 21. Accordingly, the valve seat member 21 can be securely caulked and attached to the valve housing 11 without causing the valve seat member 21 to crack.

  The use of caulking for fixing the ceramic valve seat member 21 ensures that the caulking fastening portion does not loosen like the screw coupling portion even when subjected to repeated temperature cycles, and is reliable and durable. The assembled state can be easily obtained without requiring strict management of the screwing torque.

  Moreover, if the plastic deformation ring member 45 is a plastic deformation member made of pure aluminum or the like, unlike the elastic deformation member, it may deteriorate over time even when subjected to repeated impacts, changes over time, and repeated temperature cycles. And stable performance can be obtained over a long period of time.

  A factor that can cause rattling by this fixing method is a difference in thermal expansion coefficient due to temperature changes among the valve seat member 21, the valve housing 11, and the plastic deformation ring member 45. In use as a temperature-type expansion valve of a refrigeration cycle apparatus using ammonia refrigerant, the actual use temperature difference is 100 ° C. or less, which is a sufficiently small temperature difference, and the backlash is almost zero. No problem. Further, since the actual use temperature difference is as small as 100 ° C. or less, the generated stress due to the difference in coefficient of thermal expansion is very small even if there is a temperature difference.

  Specifically, the coefficient of thermal expansion of the valve housing 11 made of mild steel and the valve seat member 21 made of partially stabilized zirconia ceramics is approximately equal to that of the plastic deformation ring member 45 made of pure aluminum. The thermal expansion coefficient is almost twice that of the stabilized zirconia ceramics.

  Therefore, due to the temperature difference, the plastic deformation ring member 45 made of pure aluminum sandwiched between the valve housing 11 made of mild steel and the valve seat member 21 made of partially stabilized zirconia ceramics becomes rattled at a low temperature. Sometimes stress occurs.

  However, since pure aluminum is about 1/10 softer than mild steel and ceramics, the thermal stress at high temperature further deforms pure aluminum. Actually, since the actual use temperature difference is a temperature difference of 100 ° C. or less, the backlash and deformation are about several microns, which is a level that hardly affects the performance.

  Even if rattling is possible, since the 0 ring 44 of elastic material is sandwiched, there is no rattling of the valve seat member 21 or deterioration of the sealing performance.

  When the valve housing 11 is made of stainless steel, the coefficient of thermal expansion of the stainless steel is almost the intermediate value between the partially stabilized zirconia ceramics and pure aluminum. Therefore, the temperature difference differs from the case where the valve housing 11 is made of mild steel. As a result, stress is generated at low temperatures and rattling occurs at high temperatures.

  However, in this case as well, pure aluminum is about 1/10 softer than mild steel and ceramics, so that the thermal stress at high temperature further deforms pure aluminum. Actually, since the actual use temperature difference is a temperature difference of 100 ° C. or less, the backlash and deformation are about several microns, which is a level that hardly affects the performance.

  Also in this case, even if rattling can be achieved, since the elastic 0 ring 44 is sandwiched, there is no rattling of the valve seat member 21 or deterioration of the sealing performance.

  As shown in FIGS. 1 to 5, when the valve housing 11 is made of stainless steel, the axial deformation of the plastic deformation ring member 45 is caused by rattling due to such a difference in thermal expansion. Longer is less. On the other hand, if the valve housing 11 is made of mild steel, the shorter the axial length of the plastic deformation ring member 45 is due to the difference in thermal expansion, as shown in FIGS. 6, 7 (a) and 7 (b). Rugged and less stress is generated.

  In FIG. 6, the caulking piece 43 shows the initial state before caulking on the left side and the state after caulking on the right side. 7A shows an initial state before caulking of the caulking piece 43, and FIG. 7B shows a state after caulking.

  Further, as shown in FIGS. 8, 9A and 9B, the contact surface of the valve seat member 21 with the plastic deformation ring member 45 is a tapered surface 21E instead of the step end surface 21D. be able to. In this case, the load by which the plastic deformation ring member 45 compresses the small outer diameter of the valve seat member 21 inward during caulking is reduced, and the valve seat member 21 is further hardly broken.

  Also in FIG. 8, the caulking piece 43 shows the initial state before caulking on the left side and the state after caulking on the right side. 9A shows an initial state before caulking of the caulking piece 43, and FIG. 9B shows a state after caulking.

  As shown in FIG. 10, the airtight seal between the valve housing 11 and the valve seat member 21 replaces the O-ring 44 and the outer peripheral surface of the large-diameter portion 21 </ b> B of the valve seat member 21 and the valve seat member reception. It can also be performed with an adhesive 46 such as a refrigerant-resistant metal adhesive applied in a layer between the inner peripheral surface of the hole 41.

  Next, an embodiment in which the valve device according to the present invention is applied as an electric expansion valve for ammonia refrigerant will be described with reference to FIGS.

  As shown in FIG. 11, the electric expansion valve includes an outer valve housing 51 and an inner valve housing 52 provided in the outer valve housing 51. Both the outer valve housing 51 and the inner valve housing 52 are made of a ferrous metal such as stainless steel or mild steel. In the outer valve housing 51, an inlet port 53 and an outlet port 54 are formed. A valve chamber 56 is formed in the inner valve housing 52.

  A ceramic valve seat member 57 is fixed to the inner valve housing 52 by caulking at a portion corresponding to the bottom of the valve chamber 56. The caulking structure of the valve seat member 57 will be described in detail with reference to FIG.

  The valve seat member 57 is cylindrical and defines a valve port 58. On the one hand, the valve port 58 communicates with the inlet port 53 via a valve chamber 56, an annular space 59 between the outer valve housing 51 and the inner valve housing 52, and a communication hole 60 formed in the outer valve housing 51. . On the other hand, the valve port 58 communicates with the outlet port 54 through holes 62, 63, 64 formed in the inner valve housing 52.

  A plug member 65 is fixed to the upper portion of the outer valve housing 51 with screws. The plug member 65 supports the upper shaft portion 67A of the metal valve rod member 67 by the guide hole 66 so as to be movable in the axial direction.

  The lower part of the valve stem member 67 is a large diameter portion 67B that also serves as a spring accommodating portion. A metal valve body mounting cylinder 69 containing a ceramic valve body 68 inside is press-fitted into the outer peripheral portion of the large diameter portion 67B, and is fixed by welding. This weld is indicated by reference numeral 70 in FIG.

  As the ceramic constituting the valve body 68, also in this embodiment, partially stabilized zirconia having high toughness, high strength and hardly cracking is preferable among ceramics. The valve body 68 is opposed to the lip piece 69A formed at the lower end of the valve body mounting cylinder 69 in the valve body mounting cylinder 69 at the shoulder 68A, and the valve rod member at the upper end 68B. It faces the lower end 67C of 67.

  Spring accommodating holes 67D and 68C are formed in the large diameter portion 67B and the valve body 68 of the valve stem member 67. A compression coil spring 71 is provided in the spring accommodating holes 67D and 68C in a state where a predetermined preload is applied, and the compression coil spring 71 urges the valve body 68 downward. Thus, in a steady state, the shoulder 68A of the valve body 68 contacts the lip piece 69A, and a gap 72 (see FIG. 12) is formed between the upper end 68B of the valve body 68 and the lower end 67C of the valve rod member 67. Arise.

  A stepping motor 75 is attached to the plug member 65. The stepping motor 75 is fixed to the plug member 65 by welding or the like, and is provided with a can-shaped rotor case 77 that delimits a rotor chamber 76 having a sealed structure inside, and is rotatably provided in the rotor chamber 76 and movable in the axial direction. The rotor 79 has a multi-pole magnetized magnet 78 attached to the outer periphery thereof, and the stator coil assembly 80 attached to the outer periphery of the rotor case 77.

  The stator coil assembly 80 includes upper and lower two-stage stator coils 81, a plurality of magnetic pole teeth 82, an electrical connector portion 83, and the like, and is hermetically sealed with a sealing resin 84. The stepping motor 75 drives the rotor 79 to be divided and rotated by energization control (pulse control) to the stator coil 81.

  A cylindrical male screw member 86 is fixed to the plug member 65. A cylindrical female screw member 85 that is screw-engaged with the male screw member 86 is fixed to the rotor 79. A connecting fitting 89 is engaged with the rotor 79 by a compression coil spring 87, and a connecting fitting 90 fixed to the upper end portion 67 </ b> E of the valve rod member 67 is engaged with the connecting fitting 89.

  With this structure, the rotor 79 moves in the axial direction with rotation, the axial movement is transmitted to the valve rod member 67, and the valve body 68 moves in the axial direction (vertical direction). As a result, the valve body 68 moves in the vertical direction as seen in FIG. 11 to open / close the valve port 58 and increase / decrease the effective opening area.

  In addition, a relief valve by a ball valve 73 and a compression coil spring 74 is incorporated in the hole 63 of the inner valve housing 52.

  Next, the caulking structure of the valve seat member 57 will be described in detail with reference to FIG.

  As shown in FIG. 12, the inner valve housing 52 is formed with a valve seat member receiving hole 91 having a bottomed structure and a circular cross section for receiving the valve seat member 57. The valve seat member receiving hole 91 communicates with a hole 62 formed in the inner valve housing 52 on the side of the bottom 92, opens to the valve chamber 56 on the side opposite to the bottom 92, and has an annular ring at the opening edge. A lip-shaped caulking piece 93 is provided. The caulking piece 93 is a part of the inner valve housing 52 and is integrally formed with the inner valve housing 52.

  The valve seat member 57 has an outer diameter slightly smaller than the inner diameter of the valve seat member receiving hole 91, a large diameter portion 57B whose tip is a tapered outer diameter portion 57A, and a small diameter portion 57C slightly smaller in diameter than the large diameter portion 57B. The whole is configured as a ceramic fired part. As the ceramic constituting the valve seat member 57, similarly to the valve body 68, partially stabilized zirconia having high toughness, high strength, and hardly cracking is preferable among ceramics.

  The valve seat member 57 is a rubber which is an elastic seal member as an airtight seal member between the tapered outer diameter portion 57A and the bottom portion 92 of the valve seat member receiving hole 91 with the tapered outer diameter portion 57A side first. The cylindrical plastic deformation ring member 95 is mounted on the outer periphery of the small-diameter portion 57C with the O-ring 94 made of a cylindrical elastic material in between, and is inserted into the valve seat member receiving hole 91.

  The plastic deformation ring member 95 is made of a plastic material whose hardness is lower than the hardness of the material constituting the inner valve housing 52. Examples of the plastic material constituting the plastic deformation ring member 95 include a soft metal material, a porous metal such as a foam metal, a wire mesh laminate, and other plastic resin materials.

  When the inner valve housing 52 is made of an iron-based metal such as stainless steel or mild steel, the plastic deformation ring member 95 is an aluminum-based material such as a pure aluminum material or an aluminum alloy whose elastic limit is about 1/10 of that of an iron-based metal. A metal is preferred.

  The valve seat member 57 causes the plastic deformation ring member 95 to be deformed by caulking and deforming the caulking piece 93 from the initial state shown on the right side of FIG. 12 to the inner diameter side as shown on the left side of FIG. To the inner valve housing 52.

  In this caulking connection state, the tip end surface of the tapered outer diameter portion 57A of the valve seat member 57 abuts against and contacts the bottom portion 92 of the valve seat member receiving hole 91, and the O-ring 94 is crushed and elastically deformed. It is sandwiched between the tapered outer diameter portion 57 </ b> A of the member 57, the bottom portion 92 of the valve seat member receiving hole 91, and the inner peripheral surface of the valve seat member receiving hole 91, and between the inner valve housing 52 and the valve seat member 57. Perform an airtight seal.

  The plastic deformation ring member 95 is sandwiched between the step end surface 57D between the large diameter portion 57B and the small diameter portion 57C of the valve seat member 57 and the caulking deformed caulking piece 93, and receives the caulking load as an axial load. As a result, the caulking load acts on the valve seat member 57 via the plastic deformation ring member 95.

  As described above, since the plastic deformation ring member 95 that is softer than these is clamped between the valve seat member 57 and the caulking piece 93 of the inner valve housing 52, the caulking load exceeding the elastic limit of the plastic deformation ring member 95 is obtained. Is absorbed by the plastic deformation of the plastic deformation ring member 95, so that a load exceeding the elastic limit of the plastic deformation ring member 95 is prevented from acting on the ceramic valve seat member 57 in advance. Accordingly, the valve seat member 57 can be securely caulked and attached to the inner valve housing 52 without causing the valve seat member 57 to crack.

  Further, before caulking, the smoothness of the step end surface 57D of the valve seat member 57 is poor, and even if the valve seat member 57 and the plastic deformation ring member 95 are in contact only at two points, the inner valve The plastic deformation ring member 95, which is softer than the housing 52 and the valve seat member 57, is plastically deformed by the caulking load, and the valve seat member 57 and the plastic deformation ring member 95 are evenly caulked all around the circumference because of the uniform contact relationship. Can be fixed with

  This allows the valve seat member 57 to be used even when the stepped end surface 57D with which the plastic deformation ring member 95 abuts is somewhat distorted while the ceramic seat is being fired. Secondary polishing after firing is not necessary, and component costs can be greatly reduced.

  Further, since the ceramic valve seat member 57 can be fixed to the inner valve housing 52 with a load uniformly applied to the entire circumference, stress concentration does not occur in the valve seat member 57 when the valve seat member 57 is mounted and used. Since an excessive load is not applied, the valve seat member 57 is not cracked and cracked, and the reliability of the mounting structure is improved.

  Specifically, when the caulking piece 93 made of steel is directly caulked without using the plastic deformation ring member 95, all of the caulking load is applied to the valve seat member 57, and the valve seat member 57 is partially Since it can only be pressed, the ceramics are easily cracked by stress concentration. On the other hand, when the inner valve housing 52 is a steel material and the plastic deformation ring member 95 is a pure aluminum material, the elastic limit of pure aluminum is about 1/10 of the elastic limit of the steel material. When the deformable ring member 95 is sandwiched and caulked with a load exceeding the elastic limit of pure aluminum, the plastic deformable ring member 95 is plastically deformed, and a load exceeding the elastic limit of pure aluminum does not act on the valve seat member 57. . Accordingly, the valve seat member 57 can be securely caulked and attached to the inner valve housing 52 without causing the valve seat member 57 to crack.

  The use of caulking for fixing the ceramic valve seat member 57 ensures that the caulking fastening portion does not loosen like the screw coupling portion even when subjected to repeated temperature cycles, and is reliable and durable. The assembled state can be easily obtained without requiring strict management of the screwing torque.

  Moreover, unlike the elastically deformable member, the plastically deformable ring member 95 is a plastically deformable member made of pure aluminum or the like, and may deteriorate over time even when subjected to repeated impacts, changes over time, and repeated temperature cycles. And stable performance can be obtained over a long period of time.

  Also in this embodiment, a factor that can cause rattling is a difference in thermal expansion coefficient due to temperature changes of the inner valve housing 52, the valve seat member 57, and the plastic deformation ring member 95. However, when the refrigeration cycle apparatus using the ammonia refrigerant is used as an electric expansion valve, the actual use temperature difference is 100 ° C. or less and is a sufficiently small temperature difference, so that no problem occurs. Further, since the actual use temperature difference is as small as 100 ° C. or less, even if there is a temperature difference, the generated stress due to the difference in thermal expansion coefficient is very small, and the valve seat member 57 will not be cracked or cracked.

  Next, another embodiment in which the valve device according to the present invention is applied as an electric expansion valve for ammonia refrigerant will be described with reference to FIG. In FIG. 13, parts corresponding to those in FIG. 11 are denoted by the same reference numerals as those in FIG. 11, and description thereof is omitted.

  Also in this embodiment, a plastic deformation ring member 95 that is softer than these is clamped between the ceramic valve seat member 57 and the caulking piece 93 of the metal valve housing 51. Thus, the caulking load exceeding the elastic limit of the plastic deformation ring member 95 is absorbed by the plastic deformation of the plastic deformation ring member 95, and the load exceeding the elastic limit of the plastic deformation ring member 95 acts on the ceramic valve seat member 57. It is avoided in advance.

  Therefore, also in this embodiment, the valve seat member 57 can be securely caulked and attached to the outer valve housing 51 without causing cracks in the valve seat member 57, and the same effect as the above-described embodiment can be obtained. .

  Next, another embodiment in which the valve device according to the present invention is applied as an electric expansion valve for ammonia refrigerant will be described with reference to FIGS. 14-16, the part corresponding to FIG. 11 attaches | subjects the code | symbol same as the code | symbol attached | subjected to FIG. 11, and the description is abbreviate | omitted.

  In this embodiment, the valve stem member 67 is made of an iron-based metal such as stainless steel or mild steel, and as shown in FIG. 14, a valve holder portion 67F is integrally formed at the lower portion. A valve body receiving hole 96 having a bottomed structure for receiving the valve body is formed in the valve holder 67F.

  As well shown in FIG. 15, an annular lip-shaped caulking piece 98 is provided on the opening edge of the valve element receiving hole 96 opposite to the bottom 97. The caulking piece 98 is a part of the valve stem member 67 and is integrally formed with the valve stem member 67.

  The valve body 68 is inserted into the valve body receiving hole 96 in a state where the cylindrical plastic deformation ring member 99 is attached to the shoulder portion 68A with the upper end portion 68B side first.

  The plastic deformation ring member 99 is made of a plastic material whose hardness is lower than the hardness of the material constituting the valve stem member 67. Examples of the plastic material constituting the plastic deformation ring member 99 include a soft metal material, a porous metal such as foam metal, a wire mesh laminate, and other plastic resin materials.

  When the valve stem member 67 is made of an iron-based metal such as stainless steel or mild steel, the plastic deformation ring member 99 is an aluminum-based material such as a pure aluminum material or an aluminum alloy whose elastic limit is about 1/10 that of an iron-based metal. A metal is preferred.

  As shown in FIG. 16, the valve element 68 is caulked and joined to the valve stem member 67 via the plastic deformation ring member 99 by deforming the caulking piece 98 toward the inner diameter side.

  In this caulking and coupling state, the upper end portion 68B of the valve body 68 abuts against and contacts the bottom portion 97 of the valve body receiving hole 96, and the plastic deformation ring member 99 contacts the shoulder portion 68A of the valve body 68 and the caulking piece 98 deformed by caulking. It is sandwiched between them and the caulking load is received as an axial load. Thereby, the caulking load acts on the valve body 68 via the plastic deformation ring member 99.

  As described above, since the plastic deformation ring member 99 softer than these is clamped between the valve body 68 and the caulking piece 98 of the valve stem member 67, the caulking load exceeding the elastic limit of the plastic deformation ring member 99 is Thus, it is avoided that a load exceeding the elastic limit of the plastic deformation ring member 99 is absorbed by the plastic deformation of the plastic deformation ring member 99 and acts on the ceramic valve body 68 in advance. Thereby, the valve body 68 can be securely caulked and attached to the valve rod member 67 without causing the valve body 68 to crack.

  Further, before the caulking, the smoothness of the shoulder 68A of the valve body 68 is poor, and even if the valve body 68 and the plastic deformation ring member 99 are in contact only at two points, the valve stem member 67 is caulked. The plastic deformation ring member 99, which is softer than the valve body 68, is plastically deformed by caulking load, and the valve body 68 and the plastic deformation ring member 99 are in uniform contact with the entire circumference, and the caulking load is uniformly applied to the entire circumference. It can be fixed with.

  As a result, the valve body 68 can be used even in a state where the shoulder 68A with which the plastic deformation ring member 99 abuts is somewhat distorted in a state where the ceramic is fired, and after the ceramic valve body 68 is fired. The secondary polishing process is not required, and the part cost can be greatly reduced.

  In addition, since the ceramic valve body 68 can be fixed to the valve stem member 67 with a load uniformly applied to the entire circumference, stress concentration does not occur in the valve body 68 when the valve body 68 is mounted and used, which is excessive. Since no load is applied, the valve body 68 is not cracked or cracked, and the reliability of the mounting structure is improved.

  Specifically, when the caulking piece 98 made of steel is directly caulked without using the plastic deformation ring member 99, all of the caulking load is applied to the valve body 68, and the valve body 68 is only partially pressed. Therefore, the ceramic is easily cracked due to stress concentration. On the other hand, when the valve stem member 67 is a steel material and the plastic deformation ring member 99 is a pure aluminum material, the elastic limit of the pure aluminum is about 1/10 of the elastic limit of the steel material. When the deformable ring member 99 is sandwiched and caulked with a load exceeding the elastic limit of pure aluminum, the plastic deformable ring member 99 is plastically deformed, and a load exceeding the elastic limit of pure aluminum does not act on the valve body 68. Thereby, the valve body 68 can be securely caulked and attached to the valve rod member 67 without causing the valve body 68 to crack.

  The use of caulking to fix the ceramic valve body 68 ensures that the caulking fastening part does not loosen like a screw joint even when subjected to repeated temperature cycles, and is reliable and durable. The state can be easily obtained without requiring strict management of the screwing torque.

  In addition, unlike the elastically deformable member, the plastically deformable ring member 99 is a plastically deformed member made of pure aluminum or the like, and may deteriorate over time even when subjected to repeated impacts, changes over time, and repeated temperature cycles. And stable performance can be obtained over a long period of time.

  Also in this embodiment, a factor that can cause rattling is a difference in coefficient of thermal expansion due to temperature change. However, when the refrigeration cycle apparatus using ammonia refrigerant is used as an electric expansion valve, the actual use temperature difference is 100 ° C. or less, which is a sufficiently small temperature difference. There is no problem. In addition, since the actual use temperature difference is as small as 100 ° C. or less, even if the temperature difference is present, the generated stress due to the difference in thermal expansion coefficient is very small, and the valve body 68 is not cracked or cracked.

  Also in this embodiment, the plastic deformation ring member 95, which is softer than these, is clamped between the ceramic valve seat member 57 and the caulking piece 93 of the metal inner valve housing 52. Thus, the caulking load exceeding the elastic limit of the plastic deformation ring member 95 is absorbed by the plastic deformation of the plastic deformation ring member 95, and the load exceeding the elastic limit of the plastic deformation ring member 95 acts on the ceramic valve seat member 57. It is avoided in advance.

  Therefore, also in this embodiment, the valve seat member 57 can be securely caulked and attached to the inner valve housing 52 without causing cracks in the valve seat member 57, and the same effect as the above-described embodiment can be obtained. .

  Next, still another embodiment in which the valve device according to the present invention is applied as an electric expansion valve for ammonia refrigerant will be described with reference to FIGS. 17 to 19, parts corresponding to those in FIGS. 11 and 12 are denoted by the same reference numerals as those in FIGS. 11 and 12, and description thereof is omitted.

    In this embodiment, similarly to the embodiment shown in FIGS. 11 and 12, a metal valve in which a ceramic valve element 68 is accommodated on the outer periphery of the large-diameter portion 67B of the valve stem member 67. The body mounting cylinder 69 is press-fitted, and the valve body mounting cylinder 69 is fixed by welding by the welding portion 70.

  As shown in FIG. 18, the plastic deformation ring member 101 is sandwiched in a portion corresponding to the gap 72 (see FIG. 12) between the upper end portion 68B of the valve body 68 and the lower end portion 67C of the valve stem member 67. It is.

  The plastic deformation ring member 101 is made of a plastic material whose hardness is lower than the hardness of the material constituting the valve stem member 67. Examples of the plastic material constituting the plastic deformation ring member 101 include a soft metal material, a porous metal such as a foam metal, a wire mesh laminate, and other plastic resin materials.

  When the valve stem member 67 is made of an iron-based metal such as stainless steel or mild steel, the plastic deformation ring member 101 is an aluminum-based material such as a pure aluminum material or an aluminum alloy whose elastic limit is about 1/10 of that of an iron-based metal. A metal is preferred.

  Thereby, the press-fit load exceeding the elastic limit of the plastic deformation ring member 101 is absorbed by the plastic deformation of the plastic deformation ring member 101, and the load exceeding the elastic limit of the plastic deformation ring member 101 acts on the ceramic valve body 68. This is avoided in advance.

  Therefore, the valve body 68 can be securely crimped to the valve rod member 67 without causing the valve body 68 to crack.

  A factor that can cause rattling by this fixing method is a difference in thermal expansion coefficient due to temperature change. However, when the refrigeration cycle apparatus using ammonia refrigerant is used as an electric expansion valve, the actual use temperature difference is 100 ° C. or less, which is a sufficiently small temperature difference. There is no problem. In addition, since the actual use temperature difference is as small as 100 ° C. or less, even if the temperature difference is present, the generated stress due to the difference in thermal expansion coefficient is very small, and the valve body 68 is not cracked or cracked. Even if rattling is achieved, the valve body 68 does not rattle because the compression coil spring 71 is sandwiched.

  As shown in FIG. 20, the mounting structure of the valve body 68 and the valve seat member 57 according to this embodiment can be similarly applied to a type electric expansion valve having flange joint members 102 and 103. .

  Next, the caulking portion due to the difference in coefficient of thermal expansion between the valve housings 11 and 51, the inner valve housing 52, the valve seat members 21 and 57, and the plastic deformation ring members 45 and 99, and the generation of stress will be considered. Since there is a difference in the coefficient of thermal expansion due to the difference in the materials of the valve housings 11 and 51, the inner valve housing 52, the valve seat members 21 and 57, and the plastic deformation ring members 45 and 99, the temperature changed during actual use. In some cases, there is a case where rattling occurs due to the generation of a gap and a case where stress (thermal stress) is generated in each component.

  This is due to the difference in thermal expansion coefficient of the three parts of the valve seat fixing part and the dimensional ratio of the three parts in the vertical direction. In some cases, thermal stress occurs when the temperature drops. Further, the thermal stress value and the amount of backlash vary depending on the difference in the thermal expansion coefficients of the three components, the dimensional ratio of the components in the vertical direction, and the amount of temperature change.

   The valve seat member fixing portion as shown in FIGS. 1 and 2 will be described. A calculation formula for the amount of dimensional change in the vertical direction of the caulking fixing portion of the valve seat member 21 due to temperature change is formed in the valve housing 11. The total dimensional change (β + γ) due to temperature changes of the two component lengths of the plastic deformation ring member 45 and the fixed length of the valve seat member 21 is calculated from the length dimensional change α of the valve seat member receiving hole 41. If the subtracted value δ is negative, it becomes thermal stress, and if it is positive, it becomes rattling due to the generation of a gap.

The dimensional change amount of each component can be calculated by (fixed part length of each component) × (thermal expansion coefficient of each component) × (temperature change amount). Therefore,
α = (length of valve seat member receiving hole 41 of valve housing 11) × (thermal expansion coefficient of valve housing 11) × (temperature change amount)
β = (length of plastic deformation ring member 45) × (thermal expansion coefficient of plastic deformation ring member 45) × temperature variation)
γ = (fixed portion length of valve seat member 21) × (thermal expansion coefficient of valve seat member 21) × (temperature change amount)
It becomes. The coefficient of thermal expansion is a value unique to each material.

  The difference value δ is a calculation when each component is not restrained in the vertical direction, and since it is actually restrained in the vertical direction, when the difference value δ is negative, (β + γ) is larger than α. That is, the length portion of the valve seat member receiving hole 41 of the valve housing 11 becomes a tensile stress in the vertical direction, and a compressive stress in the vertical direction is generated in the two parts of the plastic deformation ring member 45 and the valve seat member 21. It will be.

  When the difference value δ is positive, (β + γ) is smaller than α, which means that the length of the valve seat member receiving hole 41 of the valve housing 11 and the parts of the plastic deformation ring member 45 and the valve seat member 21 are different. In addition, a gap in the vertical direction is generated and rattling occurs.

  Since the valve seat member 21 and the plastic deformation ring member 45 are sandwiched between the valve housing 11 in the vertical direction (vertical direction), the length of the plastic deformation ring member 45 sandwiched and the length of the fixed portion of the valve seat member 21 are determined. The dimensional ratio of the three parts in the vertical direction so that the total dimensional change amount (β + γ) due to temperature changes of the two component lengths is close to the dimensional change amount α of the length of the valve seat member receiving hole 41 of the valve housing 11. By changing the configuration, even if the coefficient of thermal expansion is different because the materials of the three parts are different, the occurrence of thermal stress and rattling due to temperature changes can be set to a minimum, making it more reliable. It becomes a certain fixing method.

  For example, as shown in FIGS. 2 to 6, the dimensional ratio between the valve seat member 21 and the plastic deformation ring member 45 is changed (the valve seat member 21 is not changed without changing the length of the valve seat member receiving hole 41. The stress value and the gap are reduced by increasing the length of the fixed portion and shortening the length of the plastic deformation ring member 45). Further, by changing the length of the valve seat member receiving hole 41 and the length of the fixed portion of the valve seat member 21 without changing the length of the plastic deformation ring member 45 from the state of FIG. Will be reduced.

  When the valve housing 11 is made of a mild steel material, the valve seat member 21 is made of partially stabilized zirconia ceramics, and the plastic deformation ring member 45 is made of pure aluminum, the thermal expansion coefficient is approximately the mild steel material thermal expansion coefficient = partially stabilized zirconia thermal expansion coefficient = pure. Since the thermal expansion coefficient of aluminum is 2.3, the stress value and the gap are reduced as the length of pure aluminum is shortened and the length of steel material and partially stabilized zirconia material is lengthened. It becomes.

  Further, when the valve housing 11 is made of stainless steel, the valve seat member 21 is made of partially stabilized zirconia ceramics, and the plastic deformation ring member 45 is made of pure aluminum, the thermal expansion coefficient is almost the stealth steel material thermal expansion coefficient / 1.7 = partially stable. Zirconia thermal expansion coefficient = pure aluminum thermal expansion coefficient / 2.3. Therefore, the stress value and the gap are reduced by taking the relationship of the dimensions of the three parts so that the difference value δ is close to zero. Direction.

  When the length of the valve seat member receiving hole 41 is La and the length of the plastic deformation ring member 45 is Lb, the length of the fixed portion of the valve seat member 21 is La 1 Lb, the temperature difference is constant, and α and (β + γ) In order to set the difference value δ to 0, 2.3 × Lb + (La 1 Lb) = 1.7 × La and Lb (2.3-1) = La (1.7-1), Lb / La When La and Lb satisfy the relationship of 0.7 / 1.3, the stress value and the gap are zero.

  The fixed portion length of the valve seat member 21 is the length of the valve seat member 21 from the bottom 42 of the valve seat member receiving hole 41 of the valve housing 11 to the step end face 21D of the valve seat member 21.

  The length of the valve seat member receiving hole 41 of the valve housing 11 is the length of the valve housing 11 from the bottom portion 42 of the valve seat member receiving hole 41 to the portion where the caulking piece 43 is caulked and abuts against the plastic deformation ring member 45. It's about length.

  The above-described rattling and stress generation of the caulking portion can be said to be the same in the caulking fixing portion of the valve body 56 of the electric valve.

  Next, one embodiment of the refrigeration cycle apparatus according to the present invention will be described with reference to FIG.

  The refrigeration cycle apparatus according to this embodiment includes a compressor 201, a condenser (outdoor heat exchanger) 202, an expansion valve 203, an evaporator (indoor heat exchanger) 204, and refrigerant passages 205 to 205 that connect these in a loop. 208.

  In this refrigeration cycle apparatus, ammonia refrigerant is used to constitute an air conditioner (cooling), a refrigeration / refrigerator, or the like.

  As the expansion valve 203, the above-described temperature type expansion valve or electric expansion valve according to the present invention is used.

  The refrigeration cycle apparatus to which the above-described temperature expansion valve or electric expansion valve according to the present invention is applied is not limited to the refrigeration cycle apparatus as shown in FIG. The present invention is also applicable to a refrigeration cycle apparatus such as an air conditioner in which an exchanger is connected in series and an additional expansion valve is provided between the two heat exchangers.

It is sectional drawing which shows one Embodiment which implemented the valve apparatus by this invention as a temperature type expansion valve for ammonia refrigerant | coolants. It is an expanded sectional view showing an important section of this embodiment. (A) is an expanded sectional view which shows the state before caulking of the principal part of this embodiment, (b) is an expanded sectional view which similarly shows the state after caulking. (A) is an expansion perspective view which shows the state before caulking of the principal part of this embodiment, (b) is an enlarged perspective view which similarly shows the state after caulking. It is an expansion perspective view which shows the state after caulking of the example of the principal part of this embodiment. It is an expanded sectional view which shows the principal part of other embodiment which implemented the valve apparatus by this invention as a temperature type expansion valve for ammonia refrigerant | coolants. (A) is an expanded sectional view which shows the state before caulking of the principal part of this embodiment, (b) is an expanded sectional view which similarly shows the state after caulking. It is an expanded sectional view which shows the principal part of other embodiment which implemented the valve apparatus by this invention as a temperature type expansion valve for ammonia refrigerant | coolants. (A) is an expanded sectional view which shows the state before caulking of the principal part of this embodiment, (b) is an expanded sectional view which similarly shows the state after caulking. It is an expanded sectional view which shows the principal part of other embodiment which implemented the valve apparatus by this invention as a temperature type expansion valve for ammonia refrigerant | coolants. It is sectional drawing which shows one Embodiment which implemented the valve apparatus by this invention as an electrically driven expansion valve for ammonia refrigerant. It is an expanded sectional view showing an important section of this embodiment. It is sectional drawing which shows other embodiment which implemented the valve apparatus by this invention as an electrically driven expansion valve for ammonia refrigerant. It is sectional drawing which shows another other embodiment which implemented the valve apparatus by this invention as an electrically driven expansion valve for ammonia refrigerant. It is an expanded sectional view showing an important section of this embodiment. It is an expanded sectional view showing a caulking part of this embodiment. It is sectional drawing which shows other embodiment which implemented the valve apparatus by this invention as an electrically driven expansion valve for ammonia refrigerant. It is an expanded sectional view showing an important section of this embodiment. It is an expanded sectional view of the arrangement part of the plastic deformation ring member of this embodiment. It is sectional drawing which shows other embodiment which implemented the valve apparatus by this invention as an electrically driven expansion valve for ammonia refrigerant. It is a refrigerant circuit figure showing one embodiment of the refrigerating cycle device by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Valve housing 12 Valve chamber 21 Valve seat member 22 Valve port 25 Valve body 29 Compression coil spring 31 Temperature sensing diaphragm device 34 Temperature sensing cylinder 35 Connecting rod 41 Valve seat member receiving hole 43 Caulking piece 44 O ring 45 Plastic deformation ring member 51 Outer valve housing (valve housing)
52 Inner valve housing 56 Valve chamber 57 Valve seat member 67 Valve rod member 68 Valve body 75 Stepping motor 77 Rotor case 79 Rotor 80 Stator coil assembly 91 Valve seat member receiving hole 93 Caulking piece 94 O-ring 95 Plastic deformation ring member 96 Valve Body receiving hole 98 Caulking piece 99, 101 Plastic deformation ring member 201 Compressor 202 Condenser 203 Expansion valve 204 Evaporator

Claims (9)

In the valve device having a valve seat member made of ceramics attached to the valve housing in the valve chamber,
A valve seat member receiving hole having a bottomed structure for receiving the valve seat member is formed in the valve housing, the valve seat member is inserted into the valve seat member receiving hole, and is opposite to the bottom side of the valve seat member receiving hole. The valve seat member is fixed to the valve housing by caulking of the caulking piece formed on the opening edge on the side of the opening, and the material constituting the valve housing is between the caulking piece and the valve seat member. A valve device characterized in that a plastically deformed ring member made of a material having a hardness lower than the hardness of is sandwiched.   The valve device according to claim 1, wherein the valve housing is made of an iron-based metal, and the plastic deformation ring member is made of an aluminum-based metal.   The valve device according to claim 1 or 2, wherein a seal structure that hermetically seals between the valve seat member and the valve housing is provided in the valve seat member receiving hole.   The valve device according to claim 3, wherein the seal structure includes an elastic seal member sandwiched between a bottom portion of the valve seat member receiving hole and the valve seat member. In the valve device having a ceramic valve body attached to the valve stem member in the valve chamber,
A valve body receiving hole having a bottomed structure for receiving the valve body is formed in the valve stem member, the valve body is inserted into the valve body receiving hole, and is on a side opposite to the bottom side of the valve body receiving hole. The valve body is fixed to the valve stem member by caulking pieces formed on the edge of the opening, and the hardness of the material constituting the valve stem member is determined between the caulking piece and the valve body. A valve device characterized in that a plastic deformation ring member made of a low-hardness material is sandwiched. In the valve device having a ceramic valve body attached to the valve stem member in the valve chamber,
A valve body mounting cylinder containing the valve body inside; the valve body mounting cylinder is fixed to the valve rod member; and the valve body is mounted in the valve body mounting cylinder The valve stem is between the lip piece at the end of the cylinder and the end face of the valve stem member, and between the end face of the valve stem member and the end face of the valve body facing the end face. A valve device characterized in that a plastic deformation ring member made of a material having a hardness lower than that of a material constituting the member is sandwiched.   The valve device according to claim 5 or 6, wherein the valve stem member is made of an iron-based metal, and the plastic deformation ring member is made of an aluminum-based metal.   The valve device according to any one of claims 5 to 7, wherein a spring member is provided between the valve stem member and the valve body to urge both of them in a direction away from each other in the axial direction.   A refrigerating cycle device having the valve device according to any one of claims 1 to 8 in a refrigerant circuit.

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