JP2023157641A - Valve gear - Google Patents

Abstract

To provide a valve gear which enables improvement of sealability in a joint part between a valve housing and a joint member.SOLUTION: An motor valve 1 includes a valve housing 2, a guide member 3, a main valve element 4, an auxiliary valve element 5, and a drive part 6. A first joint pipe 11 is inserted into a first port 21 of the valve housing 2. Multiple projection parts 111 to 114 are formed along a circumferential direction on an outer peripheral surface 11A of the first joint pipe 11. The projection parts 112, 114 contact with an inner peripheral surface 21A of the first port 21 to form a gap part in which the inner peripheral surface 21A and the outer peripheral surface 11A are separated over an entire area in the circumferential direction and which is open to the outside of the valve housing 2.SELECTED DRAWING: Figure 4

Description

The present invention relates to a valve device.

BACKGROUND ART Conventionally, as a valve device, an electric valve has been proposed in which a refrigerant inlet/outlet pipe is inserted and fixed to the side surface of a valve body in which a valve chamber is formed (see, for example, Patent Document 1). In the electric valve described in Patent Document 1, a dimple is provided at a position of the piping that abuts the side wall of the valve body to ensure the connection.

Japanese Patent Application Publication No. 2006-329347

When dimples (protrusions) are provided as described in Patent Document 1, the contact area can be increased by increasing the number of protrusions or increasing the dimensions of the protrusions before fixing by brazing. If it is made larger, looseness between the valve body (valve housing) and the pipe (coupling member) can be easily suppressed. However, depending on the combination of materials and contact pressure, it may be difficult for the brazing filler metal to penetrate into the contact area, and increasing the contact area may cause fluid leakage.

An object of the present invention is to provide a valve device that can improve the sealing performance at the joint between the valve housing and the joint member.

The valve device of the present invention includes a valve housing formed in a cylindrical shape and having an opening in a curved surface portion, a valve body provided in a valve chamber inside the valve housing, and a cylindrical shape inserted into the opening. a joint member; and a fixing portion provided with a brazing material for fixing the valve housing and the joint member, the outer circumferential surface of the joint member having a A plurality of protrusions are formed along the opening, and the protrusions contact a part of the inner circumferential surface of the opening in the extending direction of the joint member, so that the inner circumferential surface and the outer circumferential surface are brought into contact with each other. The valve housing is characterized in that a gap portion is formed spaced apart over the entire circumferential direction, and the gap portion is open to the outside of the valve housing.

According to the present invention as described above, since the gap is open to the outside of the valve housing, the gap can be filled by placing and melting the unmelted brazing filler metal on the outside of the valve housing with respect to the opening. The part can be filled with brazing filler metal. This gap is created by the fact that the inner circumferential surface of the opening of the valve housing and the outer circumferential surface of the joint member are spaced apart from each other over the entire circumferential direction (that is, continuously). Brazing strength can be easily ensured, leakage can be suppressed over the entire circumferential direction at the joint between the valve housing and the joint member, and sealing performance can be improved.

At this time, in the valve device of the present invention, the inside of the opening in a cross section of the valve housing taken along a plane orthogonal to the axial direction is such that the dimension of the opening is maximum in the circumferential direction of the valve housing. An imaginary line segment connecting a central portion of one end of the peripheral surface in the thickness direction of the valve housing and a central portion of the other end in the thickness direction of the valve housing is the inner peripheral surface of the valve housing. It is preferable that it intersects with a virtual arc corresponding to the formation position of the opening. According to such a configuration, even when the virtual line segment and the virtual arc intersect, that is, even when the diameter of the opening is relatively large compared to the diameter of the valve housing and the wall thickness of the valve housing is thin, Sealing performance at the joint between the valve housing and the joint member can be improved.

Moreover, in the valve device of the present invention, it is preferable that the entire protrusion is provided inside the outer circumferential surface of the valve housing. If the protrusion has a shape that gradually protrudes as it approaches the apex in the extending direction of the joint member (for example, a mountain-shaped cross section), the gap becomes smaller as it approaches the apex. The space available for setting up is decreasing. If the entire protrusion is located inside the outer circumferential surface of the valve housing, there will be a gap between the portion of the outer circumferential surface of the coupling member where the protrusion is not formed and the inner circumferential surface of the opening. (that is, gaps can be formed in areas other than the areas where the gaps gradually become smaller due to the protrusions), making it easier to fill with the brazing material and improving sealing performance.

Further, in the valve device of the present invention, it is preferable that the dimensions of the plurality of protrusions in the extending direction are smaller than the wall thickness of the valve housing at the position where the opening is formed. According to such a configuration, it is possible to easily arrange the protrusion and its surroundings at a position facing the inner circumferential surface of the opening, and it is easy to form a gap while bringing the protrusion into contact with the inner circumferential surface. can do. Therefore, the positional relationship between the valve housing and the joint member can be easily adjusted and set.

Further, in the valve device of the present invention, it is preferable that the gap portion has a gap portion that is open to the inside of the valve housing. According to such a configuration, since the gap is formed not only on the outside of the valve housing but also on the inside, brazing strength can be easily ensured on the inside as well, and sealing performance can be improved.

Further, in the valve device of the present invention, the plurality of protrusions include at least four protrusions arranged at equal intervals in the circumferential direction, and at least two of the protrusions are in contact with the inner circumferential surface. preferable. According to such a configuration, by inserting the joint member into the opening to a predetermined depth, at least two protrusions can be brought into contact with the inner circumferential surface of the opening. Therefore, there is no need to adjust the angle by rotating the joint member around its extending direction in order to bring the protrusions into contact with each other, and workability can be improved.

Further, in the valve device of the present invention, it is preferable that the valve housing and the joint member are made of stainless steel, and that the brazing filler metal contains copper as a main raw material or copper and silver as main raw materials. . According to such a structure, costs can be reduced compared to a case where each part is made of copper. Moreover, even if the base materials (main raw materials) of the members to be joined and the brazing material are different and an alloy is not formed, the sealing performance can be improved by forming the gap as described above.

Further, in the valve device of the present invention, the plurality of protrusions include a contact protrusion that contacts the inner circumferential surface, and a separation protrusion that is arranged on the inside or outside of the valve housing with respect to the inner circumferential surface. It is preferable to have the following. According to such a configuration, since the separation projection is provided in addition to the contact projection, the separation projection can be used as a spare projection. In other words, if the rotation angle of the joint member changes from the initial angle and the protrusion that is supposed to be the contact protrusion does not actually contact the inner circumferential surface, the protrusion that is supposed to be the separation protrusion may not touch the inner circumferential surface. It is easy to make contact, and it is possible to easily form a gap while bringing the protrusions into contact.

According to the valve device of the present invention, it is possible to improve the sealing performance at the joint between the valve housing and the joint member.

FIG. 1 is a sectional view showing a valve device according to an embodiment that is an example of the present invention. It is a side view which shows the said joint member. It is a sectional view showing a connection part of a valve housing and a joint member in the valve device. FIG. 3 is an enlarged cross-sectional view of the connection portion.

Embodiments of the present invention will be described with reference to the drawings. An electric valve 1 as a valve device of this embodiment is used, for example, in a refrigeration cycle system of an air conditioner such as a package air conditioner, a room air conditioner, or a multi-purpose air conditioner, and as shown in FIG. , a guide member 3, a main valve body 4, a sub-valve body 5, and a drive section 6. The main valve body 4 and the sub-valve body 5 are provided so as to move along a predetermined axial direction, and hereinafter, this axial direction will be referred to as the Z direction, and the two directions orthogonal to the Z direction will be referred to as the X direction and the Y direction. The upper and lower directions in the Z direction are based on FIG.

The valve housing 2 is made of stainless steel and has a cylindrical shape, and has a main valve chamber (valve chamber) 2R inside thereof. Here, the term "cylindrical" includes not only a cross-sectional shape that is a perfect circle, but also a shape that is slightly distorted from a perfect circle. The valve housing 2 has a first port (opening) 21 that is open on one side in the X direction and a second port 22 that is open on the lower side in the Z direction on its curved side surface. A cylindrical first joint pipe (joint member) 11 whose extending direction is in the X direction is connected to the first port 21, and a cylindrical first joint pipe (joint member) whose extending direction is in the Z direction is connected to the second port 22. Two joint pipes 12 are connected, and the first joint pipe 11 and the second joint pipe 12 communicate with the main valve chamber 2R. The first joint pipe 11 and the second joint pipe 12 may be fixed to the valve housing 2 by, for example, brazing. Hereinafter, the inside of the main valve chamber 2R will be referred to as the "inside of the valve housing 2" with the valve housing 2 as a reference, and the external space will be referred to as the "outside of the valve housing 2." In particular, in the X direction, the main valve chamber 2R side across the wall of the valve housing 2 is the inside, and the external space side is the outside. Further, the circumferential direction of the valve housing 2 is a direction around the axis along the Z direction.

A cylindrical main valve seat 23 is formed at the lower end of the valve housing 2 and projects toward the main valve chamber 2R (upwards) with the Z direction as the axial direction. The main valve port 23a and the second port 22 communicate with each other. That is, the second joint pipe 12 is connected to the main valve chamber 2R via the main valve port 23a. In this embodiment, the electric valve 1 has the first port 21 as the primary side and the second port 22 as the secondary side, and the fluid (refrigerant) flowing into the main valve chamber 2R from the first joint pipe 11 is transferred to the second port 22. Although it is assumed that the motor-operated valve 1 is used to flow out of the joint pipe 12, the motor-operated valve 1 may be incorporated into a cycle in which fluid can flow in both directions.

Here, the first port 21 is formed in a curved part of the cylindrical valve housing 2, and the first port 21 is formed in a bar ring that protrudes inside or outside of the valve housing 2. isn't it. Therefore, when the cylindrical valve housing 2 is cut along the XY plane so as to pass through the first port 21, the position of the inner peripheral surface of the first port 21 in the X direction depends on the position of this cross section in the Z direction. and change. Therefore, when the first joint pipe 11 is inserted into the first port 21, the position in the X direction where the outer peripheral surface 11A of the first joint pipe 11 contacts the inner peripheral surface 21A of the first port 21 depends on the position in the Z direction. different. More specifically, at the uppermost and lowermost positions of the outer peripheral surface 11A in the Z direction, the contact position is the rightmost position in the X direction in FIG. This is the farthest left side in Figure 1. On the other hand, when the bur ring is cut along the XY plane, the position of the inner peripheral surface of the bur ring in the X direction hardly changes, and the position where the joint pipe contacts the inner peripheral surface of the bur ring also changes regardless of the position in the Z direction. It remains almost constant.

In the cross section (for example, FIG. 3) obtained by cutting the cylindrical valve housing 2 along the XY plane as described above, the entire inner circumferential surface 21A of the first port 21 is larger than the inner circumferential surface 2B of the valve housing 2. It is located outside the housing 2 and located inside the valve housing 2 from the outer peripheral surface 2A of the valve housing 2. Therefore, the dimension of the inner peripheral surface 21A in the X direction (extending direction of the first joint pipe 11) is equal to or less than the wall thickness of the valve housing 2 at the position where the first port 21 is formed (in this embodiment, it is equivalent). . On the other hand, when a bur ring is formed, the inner dimension of the bur ring in the extending direction of the joint member is larger than the wall thickness of the valve housing.

The guide member 3 is attached to the opening at the upper end of the valve housing 2, and includes a press-fitting part 31 that is press-fitted into the inner peripheral surface of the valve housing 2, and a substantially cylindrical shape located inside the press-fitting part 31. A guide part 32, a holder part 33 extending above the guide part 32, a stopper part 34 provided above the holder part 33, a ring-shaped flange part 35 located on the outer periphery of the guide part 32, have. The press-fitting part 31, the guide part 32, the holder part 33, and the stopper part 34 are constructed as an integral part made of resin. Further, the flange portion 35 is a metal plate made of, for example, brass or stainless steel, and is integrally provided with the resin press-fit portion 31 and the holder portion 33 by insert molding.

The guide member 3 is assembled to the valve housing 2 and is fixed to the upper end of the valve housing 2 at the flange portion 35 by welding. Further, in the guide member 3, a cylindrical guide hole 32a having an axial direction in the Z direction is formed in the guide portion 32, and an insertion hole 33a coaxial with the guide hole 32a is formed in the center of the holder portion 33. Furthermore, a female threaded portion (screw hole) 34a is formed in the center of the stopper portion 34 and is coaxial with the guide hole 32a and the insertion hole 33a.

The main valve body 4 is disposed within the guide hole 32a of the holder portion 33, and is entirely formed in a cylindrical shape with its axis extending in the Z direction. The main valve body 4 includes a partition wall portion 41 that extends along the XY plane and to which the sub valve body 5 approaches or separates, and a cylindrical portion that extends from the partition wall portion 41 toward the opposite side (upper side) from the main valve port 23a. 42 and a main valve portion 43 that approaches or separates from the main valve seat 23.

The partition wall portion 41 is a sub-valve seat portion provided at the lower end of the cylindrical portion 42, and is formed into a plate shape having a predetermined thickness (Z-direction dimension). A bottomed cylindrical portion is formed by the partition wall portion 41 and the cylindrical portion 42, and the inside of this bottomed cylindrical portion becomes the sub-valve chamber 4R. A sub-valve port 41a, which is a through hole, is formed in the center of the partition wall portion 41. The cylindrical portion 42 is formed into a cylindrical shape, and a presser member 9, which will be described later, is provided inside thereof, and the inner circumferential surface of the presser member 9 functions as a needle guide hole. A guide boss portion 53 attached to a valve shaft 51, which will be described later, is inserted into this needle guide hole, and a ring-shaped retainer 44 is fitted onto the upper end of this cylindrical portion 42 by fitting or welding. It is fixed. Further, a main valve spring 4a is disposed between the retainer 44 and the upper end of the guide hole 32a, and the main valve body 4 is moved toward the main valve seat 23 (lower side in the Z direction; closed) by the main valve spring 4a. direction).

A plurality of communication passages 421 are formed in the cylindrical portion 42 to communicate between the inside and the outside. The plurality of communication passages 421 are arranged at equal intervals in the circumferential direction centered on the Z direction. By forming the communication passage 421 in the cylindrical portion 42, the main valve chamber 2R, the sub-valve chamber 4R, the sub-valve port 41a, and the main valve port 23a communicate with each other.

The main valve part 43 is formed into a substantially cylindrical shape so that the cylindrical part 42 extends below the partition part 41. The main valve portion 43 is provided so as to sit on (abut) the main valve seat 23 in a fully closed state.

The sub-valve body 5 is a needle valve, and is provided at the lower end of a rotor shaft 61, which will be described later, and includes a valve shaft 51 connected to the rotor shaft 61 side and a needle portion 52 connected to the lower end of the valve shaft 51. It has an integrated structure. The sub-valve body 5 further includes a guide boss portion 53 fixed to the valve shaft 51. Although the guide boss portion 53 is fixed separately from the valve shaft 51, the guide boss portion 53 may be formed integrally with the valve shaft 51. The guide boss portion 53 is slidably inserted into the needle guide hole formed by the holding member 9.

The drive unit 6 is provided inside and outside of a case 24 fixed to the upper end of the valve housing 2, and includes a stepping motor 6A, a screw feeding mechanism 6B that advances and retreats the sub-valve body 5 by rotation of the stepping motor 6A. , and a stopper mechanism 6C that restricts rotation of the stepping motor 6A. The case 24 is airtightly fixed to the valve housing 2 by, for example, welding.

The stepping motor 6A includes a rotor shaft 61, a magnet rotor 62 rotatably disposed inside a case 24, a stator coil (not shown) disposed opposite to the magnet rotor 62 on the outer periphery of the case 24, and others. , is composed of a yoke, an exterior member, etc. (not shown). The rotor shaft 61 is attached to the center of the magnet rotor 62 via a bush, and a male threaded portion 61a is formed on the outer periphery of the rotor shaft 61 on the guide member 3 side. The male threaded portion 61a is screwed into the female threaded portion 34a of the guide member 3, so that the guide member 3 supports the rotor shaft 61 on the axis along the Z direction. The female threaded portion 34a of the guide member 3 and the male threaded portion 61a of the rotor shaft 61 constitute a screw feeding mechanism 6B.

In this embodiment, a first sound deadening member 7 and a second sound deadening member 8 are provided. The first silencing member 7 is formed in an annular shape as a whole so that the valve shaft 51 and the needle portion 52 can pass therethrough, and is arranged in the flow path from the communication passage 421 to the sub-valve port 41a. A presser member 9 is provided in order to arrange the first muffling member 7 within the cylindrical portion 42 . That is, the pressing member 9 and the first sound deadening member 7 are sandwiched between the partition wall portion 41 and the retainer 44 from the Z direction.

The first silencing member 7 is a filter formed into a three-dimensional mesh shape by randomly bending a linear member. The first silencing member 7 may be, for example, a demister. The first silencing member 7 formed in a mesh shape in this manner functions to subdivide the flow path, and the fluid (refrigerant) passes through the first silencing member 7 while being subdivided. That is, when the fluid in the gas-liquid mixed state passes through the first muffling member 7, the air bubbles are subdivided. At this time, since the linear member is bent at random, the first silencing member 7 has various sizes of passage areas as passage portions through which fluid can pass. Furthermore, when the fluid passes through the first sound deadening member 7 along a predetermined passing direction, the passable area changes depending on the position in the passing direction. This allows bubbles of various sizes to be subdivided.

The second silencing member 8 is disposed in the flow path from the auxiliary valve port 41a to the main valve port 23a, that is, when the first port 21 is the primary side, the second silencing member 8 is located downstream of the first silencing member 7. placed on the side. The second sound deadening member 8, like the first sound deadening member 7, is a filter formed into a three-dimensional mesh shape by randomly bending a linear member, and may be a demister, for example. Although it is preferable that the first sound deadening member 7 has a higher density than the second sound deadening member 8, these densities may be approximately the same.

Here, details of the opening and closing operations of the main valve body 4 and the sub valve body 5 in the electric valve 1 will be explained. When the magnet rotor 62 and the rotor shaft 61 are rotated by the driving of the stepping motor 6A, the rotor shaft 61 is moved along the Z direction by the screw feeding mechanism 6B of the male threaded portion 61a of the rotor shaft 61 and the female threaded portion 34a of the guide member 3. do. As a result, the sub-valve body 5 moves forward and backward in the Z direction, approaches or separates from the sub-valve port 41a, and the valve opening degree of the sub-valve port 41a is controlled (small flow rate control). Further, the guide boss portion 53 of the sub-valve body 5 engages with the pressing member 9, and the main valve body 4 moves together with the sub-valve body 5 to approach or separate from the main valve seat 23 (large flow control ). Thereby, the flow rate of the refrigerant flowing from the first joint pipe 11 toward the second joint pipe 12 is controlled. In this embodiment, even when the sub-valve body 5 moves forward and backward in the Z direction and comes closest to the sub-valve seat having the sub-valve port 41a, the sub-valve body 5 does not come into contact with the sub-valve seat. A gap is formed between the sub-valve body 5 and the sub-valve seat, allowing fluid to pass through the sub-valve port 41a, but the sub-valve body 5 is seated on the sub-valve seat. The configuration may be such that

A male thread-shaped guide groove 34b is formed on the outer peripheral surface of the stopper portion 34 of the guide member 3, and a slider 63 is provided in this guide groove 34b. The slider 63 contacts the magnet rotor 62, and rotates and moves up and down along the guide groove 34b as the magnet rotor 62 rotates. The slider 63 constitutes a stopper mechanism 6C that restricts the rotation of the magnet rotor 62 by coming into contact with the upper end or lower end of the guide groove 34b. This stopper mechanism 6C regulates the lowest and highest positions of the rotor shaft 61 and the magnet rotor 62.

Next, details of the connection structure between the valve housing 2 and the first joint pipe 11 will be explained with reference to FIGS. 2 to 4. Since the valve housing 2 is formed with a circular first port 21 when viewed from the X direction, when cutting the valve housing 2 along the XY plane, if the cutting position changes in the Z direction, The opening dimension (Y direction dimension) of the first port 21 in the cross section changes. FIG. 3 shows a cross section in which the opening size of the first port 21 is maximized. At this time, the end of the inner circumferential surface 21A of the first port 21 on one side (upper side in the figure) in the Y direction is defined as one end 211, and the end on the other side (lower side in the figure) is defined as the other end 212. . A central portion 211A of one end portion 211 in the wall thickness direction of the valve housing 2 (X direction in FIG. 3) and a central portion 212A of the other end portion 212 in the wall thickness direction of the valve housing 2 are hypothetically defined. The line segment connecting to is defined as a virtual line segment L1. Further, an arc corresponding to the formation position of the first port 21 on the inner circumferential surface of the valve housing 2 (this is a portion that existed before the first port 21 was formed, and the first port 21 of the valve housing 2 (a portion obtained by extending an arc other than the above) is defined as a virtual arc C1. The virtual line segment L1 and the virtual arc C1 intersect.

The first joint pipe 11 is made of stainless steel and has a cylindrical shape, and the circumferential direction of the first joint pipe 11 is a direction around the axis along the X direction. As shown in FIG. 2, four protrusions 111 to 114 are formed on the outer peripheral surface 11A of the first joint pipe 11 along the circumferential direction of the first joint pipe 11. The four protrusions 111 to 114 are arranged at equal intervals along the circumferential direction of the first joint pipe 11, with the protrusions 111 and 113 facing each other in the radial direction, and the protrusions 112 and 114 facing each other in the radial direction. radially opposed.

In the present embodiment, the first joint tube 11 is inserted into the first port 21 at a rotation angle such that the protrusion 112 and the protrusion 114 face each other in the Y direction. At such a rotation angle, the insertion depth is such that the center portions of the projections 112, 114 in the X direction contact the inner circumferential surface 21A at a position inside the valve housing 2 from the center portions 211A, 212A. It's deep.

The protrusions 111 to 114 have similar shapes. As shown in FIG. 4, the protrusion 112 includes an apex portion 112A having predetermined dimensions and extending along the X direction, and a vertex portion 112A extending toward the outside of the first joint pipe 11 as it approaches the apex portion 112A in the X direction. The cross section along the XY plane has a mountain shape with a flat apex. The dimension W1 in the X direction of the entire protrusion 112 including the apex portion 112A and the pair of inclined portions 112B is smaller than the wall thickness T1 of the valve housing 2 at the position where the first port 21 is formed. The entire protrusion 112 is located inside the valve housing 2 rather than the outer peripheral surface 2A of the valve housing 2. That is, in the first joint pipe 11, a non-formed region 115 where the protrusions 111 to 114 are not formed is located outside the valve housing 2 than the protrusions 111 to 114, and faces the inner circumferential surface 21A of the first port 21. It looks like this. In the illustrated example, a portion of one inclined portion 112B is located inside the inner circumferential surface 2B of the valve housing 2 (inside the main valve chamber 2R).

As the non-forming region 115 faces the inner circumferential surface 21A as described above, a gap A1 is created between the inner circumferential surface 21A of the first port 21 and the outer circumferential surface 11A of the first joint pipe 11, which are spaced apart from each other. It is formed. The gap A1 is formed on the outer side of the valve housing 2 than the protrusion 112, and is open to the outside of the valve housing 2. That is, the gap A1 is continuous with the outer edge of the valve housing 2 in the first port 21.

Like the protrusion 112, the protrusion 114 comes into contact with the inner peripheral surface 21A and becomes a contact protrusion, and the protrusions 111 and 113 are both arranged inside the valve housing 2 with respect to the inner peripheral surface 21A (i.e., inside the valve housing 2). (does not contact the peripheral surface 21A) and becomes a separating protrusion. Therefore, the gap A1 formed on the outer side of the valve housing 2 than the protrusions 112 and 114 is formed over the entire circumferential direction of the first joint pipe 11, and has an annular shape. On the other hand, inside the valve housing 2, although the inner circumferential surface 21A and the outer circumferential surface 11A are separated from each other at positions other than the protrusions 112 and 114, such a gap is interrupted at the protrusions 112 and 114, No annular gap is formed.

When joining the first joint pipe 11 to the valve housing 2, as shown in FIG. 1, a brazing material is placed around the first port 21 and outside the valve housing 2, and the brazing material is melted. The molten brazing filler metal permeates between the inner circumferential surface 21A and the outer circumferential surface 11A. As a result, a fixing part 200 is formed in which the brazing material 100 is provided to fix the valve housing 2 and the first joint pipe 11. At this time, the gap A1 is filled with the brazing material, and the brazing material that has passed through the portions other than the projections 112 and 114 also solidifies inside the valve housing 2.

In the above description, it is assumed that the protrusions 112 and 114 face each other in the Y direction, but the rotation angle of the first joint pipe 11 may change. If the insertion depth does not change from the normal depth and the rotation angle changes from the above angle (referred to as the reference angle), the positions where the protrusions 112, 114 contact the inner circumferential surface 21A will change as the rotation angle changes. It gradually moves inside the valve housing 2. On the other hand, the protrusions 111 and 113 approach the inner peripheral surface 21A. At a predetermined angle where the change from the reference angle is within 45 degrees, the protrusions 111 and 113 come into contact with the inner circumferential surface 21A, and at a predetermined angle where the change is greater than 45 degrees, the protrusions 112 and 114 contact the inner peripheral surface 21A. It no longer contacts the inner circumferential surface 21A. That is, regardless of the rotation angle of the first joint tube 11, at least two of the protrusions 111 to 114 are in contact with the inner circumferential surface 21A. Furthermore, the positions where the protrusions 112 and 114 contact the inner circumferential surface 21A are the outermost parts of the valve housing 2 at the reference angle (that is, the X-direction dimension of the gap A1 is the smallest), and the Even if the angle changes, there will be no further contact with the outside. Therefore, regardless of the rotation angle of the first joint pipe 11, the gap A1 formed on the outer side of the valve housing 2 from the projections 112 and 114 is formed over the entire circumferential direction of the first joint pipe 11. Ru.

The above-mentioned brazing filler metal has copper as its main raw material, or copper and silver as its main raw materials. Here, the main raw material refers to the metal having the largest weight percentage among the plurality of metals constituting the alloy.

According to the present embodiment described above, since the gap A1 is open to the outside of the valve housing 2, the brazing material before melting is placed outside the first port 21 and melted, so that the gap A1 The brazing filler metal 100 can be filled. This gap A1 is formed by separating the inner circumferential surface 21A of the first port 21 and the outer circumferential surface 11A of the first joint pipe 11 over the entire circumferential direction (that is, continuously). It is easy to ensure brazing strength when filled with 100%, and leakage can be suppressed throughout the circumferential direction at the joint between the valve housing 2 and the first joint pipe 11, and the sealing performance can be improved. can.

Further, in the valve housing 2, the virtual line segment L1 and the virtual arc C1 intersect, the diameter of the first port 21 is relatively large compared to the diameter of the valve housing 2, and the wall thickness of the valve housing 2 is thin. However, the sealing performance at the joint between the valve housing 2 and the first joint pipe 11 can be improved.

In addition, since the entire protrusion 112 is provided inside the outer circumferential surface 2A of the valve housing 2, the protrusion 112 is provided not only between the inclined portion 112B and the inner circumferential surface 21A, but also between the non-forming area 115 and the inner circumferential surface. A gap A1 can also be formed between the gap A1 and the brazing filler metal 100, thereby making it easier to fill the brazing filler metal 100 and improving sealing performance.

Furthermore, since the dimension W1 in the X direction of the protrusion 112 is smaller than the wall thickness T1 of the valve housing 2 at the position where the first port 21 is formed, the protrusion 112 and its surroundings can be The protrusion 112 can be easily disposed at a position facing the inner peripheral surface 21A, and the gap A1 can be easily formed while bringing the protrusion 112 into contact with the inner circumferential surface 21A. Therefore, the positional relationship between the valve housing 2 and the first joint pipe 11 can be easily adjusted and set.

Further, the four protrusions 111 to 114 are arranged at equal intervals in the circumferential direction, and at least two of these protrusions come into contact with the inner circumferential surface 21A of the first port 21, so that the first joint pipe 11 can be connected to the first port 21. By inserting the protrusions 111 to 114 to the proper depth, at least two of the protrusions 111 to 114 can be brought into contact with the inner circumferential surface 21A. Therefore, there is no need to adjust the angle by rotating the first joint pipe 11 around the X direction in order to bring the protrusions 111 to 114 into contact with each other, and work efficiency can be improved.

In addition, the valve housing 2 and the first joint pipe 11 are made of stainless steel, and the brazing filler metal is made of copper as the main raw material, or the brazing filler metal is made of copper and silver as the main raw materials, so that each part is made of copper. The cost can be reduced by comparison. Moreover, even if the base materials (main raw materials) of the members to be joined and the brazing material are different and no alloy is formed, the sealing performance can be improved by forming the gap A1 as described above.

Further, when the rotation angle of the first joint pipe 11 is set as a reference angle, for example, the two protrusions 112 and 114 become contact protrusions that contact the inner circumferential surface 21A, and the two protrusions 111 and 113 serve as contact protrusions that contact the inner circumferential surface 21A. 21A, so that when the rotation angle changes from the reference angle and the contact protrusion no longer contacts the inner circumferential surface 21A, the non-contact protrusion can be easily brought into contact with the inner circumferential surface 21A. That is, a spare protrusion can be provided in case the rotation angle changes, and the gap A1 can be easily formed while bringing the protrusions 111 to 114 into contact with each other.

Note that the present invention is not limited to the embodiments described above, and includes other configurations that can achieve the object of the present invention, and the present invention also includes the following modifications. For example, in the embodiment, the virtual line segment L1 intersects with the virtual arc C1, the diameter of the first port 21 is relatively large compared to the diameter of the valve housing 2, and the wall thickness of the valve housing 2 is thin. However, the configuration may be such that the virtual line segment L1 and the virtual arc C1 do not intersect. Even with this configuration, since the gap A1 over the entire circumferential direction is open to the outside of the valve housing 2, leakage can be suppressed over the entire circumferential direction, and the sealing performance can be improved. can be improved.

Further, in the above embodiment, the entire protrusion 112 is provided inside the outer peripheral surface 2A of the valve housing 2, but a part of the projection is provided outside the outer peripheral surface 2A of the valve housing 2. It may be located. For example, if the sloped portion 112B as in the embodiment described above extends from the outside to the inside of the outer peripheral surface 2A, a gap can be formed between the sloped portion 112B and the inner peripheral surface 21A of the first port 21. .

Furthermore, in the embodiment described above, the X-direction dimension W1 of the protrusion 112 is smaller than the wall thickness T1 of the valve housing 2 at the position where the first port 21 is formed, but the X-direction dimension W1 is equal to or larger than the wall thickness T1. It may be. For example, even if the X-direction dimension W1 is relatively large, if the protrusion 112 is placed sufficiently inside the valve housing 2 with respect to the inner peripheral surface 21A of the first port 21, the gap can be reduced. can be formed.

Furthermore, in the above embodiment, the gap A1 over the entire circumferential direction is open to the outside of the valve housing 2, and no annular gap is formed inside the valve housing 2. In addition to the portion A1, a gap portion that is open to the inside of the valve housing 2 and extends over the entire circumferential direction may also be formed. If a gap is formed not only on the outside but also on the inside of the valve housing 2, brazing strength can be easily ensured on the inside as well, and the sealing performance can be improved.

Further, in the embodiment, at least two of the four equally spaced protrusions 111 to 114 are in contact with the inner circumferential surface 21A of the first port 21, but the number and arrangement of the protrusions are not limited to this. . For example, other protrusions may be added in addition to the four protrusions arranged at equal intervals, five or more protrusions may be arranged at equal intervals, or multiple protrusions may be arranged at equal intervals. The intervals between the two do not have to be constant. Note that it is preferable that an even number of protrusions be arranged at equal intervals to form a pair of protrusions facing each other in the radial direction. Further, the number of protrusions may be 2 or 3. For example, by controlling the insertion depth and rotation angle of the joint member, at least two protrusions can be brought into contact with the inner peripheral surface of the opening. Good too.

Furthermore, in the embodiment described above, the valve housing 2 and the first joint pipe 11 are made of stainless steel, and the brazing filler metal is mainly made of copper or copper and silver. The material may be appropriately selected depending on cost, sealability, workability, and a combination thereof.

Furthermore, in the embodiment described above, when the projections 111 and 113 serve as separation projections, they are arranged inside the valve housing 2, but the separation projections may be arranged outside the valve housing 2. Moreover, the insertion depth and rotation angle may be adjusted so that all of the plurality of protrusions become contact protrusions.

Furthermore, in the above embodiment, the motor-operated valve 1 is provided with the main valve element 4 and the sub-valve element 5 and is capable of large flow control and small flow control. but not limited to. For example, in a valve device provided with only one valve body, a gap may be formed that extends throughout the circumferential direction and is open to the outside of the valve housing. Further, the valve device of the present invention may be a solenoid valve or a multi-way valve (two-way valve, three-way valve, four-way valve, etc.). At this time, no burring is provided around the opening formed in the cylindrical valve housing, and the coupling member may be inserted through this opening to form a gap. In addition, the plurality of protrusions of the joint member are provided for the purpose of at least a portion of the protrusions coming into contact with the inner circumferential surface of the valve housing, and are used for parts housed in the valve housing (for example, a valve seat in a four-way valve). It is not provided to make contact with any other member.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design may be changed without departing from the gist of the present invention. Even if there is, it is included in the present invention.

1... Electric valve (valve device), 2... Valve housing, 2A... Outer circumferential surface, 21... First port (opening), 21A... Inner circumferential surface, 211... One end, 211A, 212A... Center, 212... Others End, 2R...Main valve chamber, 4...Main valve body, 5...Sub-valve body, 11...First joint pipe (coupling member), 11A...Outer peripheral surface, 111-114...Protrusion, 100...Brazing material, 200 ...Fixed part, A1...Gap part, L1...Virtual line segment, C1...Virtual arc

Claims (8)

A valve housing formed in a cylindrical shape and having an opening in a curved surface portion, a valve body provided in a valve chamber inside the valve housing, a cylindrical joint member inserted into the opening, and the valve. A valve device comprising a fixing part provided with a brazing material to fix the housing and the coupling member,
A plurality of protrusions are formed along the circumferential direction on the outer peripheral surface of the joint member,
The protrusion contacts a part of the inner circumferential surface of the opening in the extending direction of the joint member, so that the inner circumferential surface and the outer circumferential surface are separated from each other throughout the circumferential direction. A gap is formed,
A valve device characterized in that the gap portion is open to the outside of the valve housing. In a cross section of the valve housing taken along a plane perpendicular to the axial direction so that the size of the opening is maximum in the circumferential direction of the valve housing, the valve housing is located at one end of the inner circumferential surface of the opening. An imaginary line segment connecting the center portion in the wall thickness direction of the valve housing and the center portion of the other end portion in the wall thickness direction of the valve housing corresponds to the formation position of the opening portion on the inner circumferential surface of the valve housing. 2. The valve device according to claim 1, wherein the valve device intersects with a virtual arc. The valve device according to claim 1, wherein the entire protrusion is provided inside the outer peripheral surface of the valve housing. The valve according to any one of claims 1 to 3, wherein a dimension of the plurality of protrusions in the extending direction is smaller than a wall thickness of the valve housing at a position where the opening is formed. Device. The valve device according to any one of claims 1 to 3, characterized in that the gap portion has a gap portion that is open to the inside of the valve housing. The plurality of protrusions include at least four protrusions arranged at equal intervals in the circumferential direction, and at least two of the protrusions are in contact with the inner circumferential surface. The valve device according to any one of the items. The valve housing and the joint member are made of stainless steel,
The valve device according to any one of claims 1 to 3, wherein the brazing filler metal contains copper as a main raw material or copper and silver as main raw materials. A claim characterized in that the plurality of protrusions include a contact protrusion that contacts the inner circumferential surface, and a separation protrusion that is disposed on the inside or outside of the valve housing with respect to the inner circumferential surface. The valve device according to any one of items 1 to 3.

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