JP2020073830A - Electrically drive valve - Google Patents

Abstract

To provide an electrically drive valve that is capable of improving a stream of a braze filler and securing air tightness of a valve chamber.SOLUTION: An electrically drive valve includes a valve body 2, a sheet member 5 and a first port 3. The valve body 2 is provided with a recess 22 where an opening 22a is provided on a bottom surface and coming in communication with a valve chamber 21. One end of the sheet member is fitted into the recess. The first separation part S1 is formed between a recess wall 22c facing an outer circumferential surface of the sheet member. An end of the first port is inserted between the other end and the recess of the sheet member. The inner circumferential surface of the first port faces the outer circumferential surface of the other end of the sheet member. A second separation part S2 is formed between the inner circumferential surface of the first port and the outer circumferential surface of the other end of the sheet member. A third separation part S3 is formed between the outer circumferential surface of the first port and the recess wall 22d facing the outer circumferential surface. The third separation part comes in communication with the first separation part and the second separation part. A width of the first separation part is equal to or less than a width of the second separation part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electrically driven valve that electrically drives a valve element to adjust the opening degree of the valve.

  The motor-operated valve connects the first port and the second port, which are flow paths, via a valve chamber, which is an internal space of the valve body, and changes the opening cross-sectional area of the first port by the valve body to control the flow rate. To do. An orifice is provided in the first port. On the other hand, the valve body is tapered by tapering the diameter. Therefore, the cross-sectional area of the gap between the valve body and the orifice changes according to the amount of insertion of the valve body into the orifice, and the flow rate between the first port and the second port changes accordingly. ..

  As such an electrically operated valve, a so-called screw feeding mechanism for moving the valve element is known (see, for example, Patent Document 1). In this moving method, the valve element is formed in the tip region of the valve shaft extending toward the orifice. The valve shaft is axially movable. This valve shaft is integral with a valve shaft holder having a movable screw formed therein, and the movable screw of the valve shaft holder is screwed with a fixing screw of a guide bush that does not move. Further, the valve shaft holder is integrated with the rotor of the stepping motor to rotate the shaft. Therefore, the valve shaft holder rotates axially with the rotor and is screw-fed along the guide bush, the valve shaft moves axially with the valve shaft holder, and the valve body moves in or out of the orifice. To do.

JP, 2006-070988, A JP, 2013-036487, A

  In addition to the motor-operated valve of the type in which the orifice is provided in the first port, there is also the motor-operated valve of the type in which the orifice is provided in the valve body so as to be continuous with the valve chamber inside the valve body (for example, Patent Document 2). Since the orifice forms a flow path through which the fluid passes, it is preferable that the orifice be made of a material having good corrosion resistance such as stainless steel in consideration of the corrosion caused by the fluid. Therefore, a motor-operated valve of the type in which the valve body and the orifice are configured by separate members is known.

  As shown in FIG. 4, this type of motor-operated valve includes a valve body 102 having a valve chamber 121 inside, a seat member 105 provided with an orifice 151 communicating with the valve chamber 121, and a port having a flow passage inside. The three members 103 are integrally formed by joining. Further, in this type of motor-operated valve, the end portion of the seat member 105 may be extended to the inside of the port 103 for the purpose of improving noise reduction.

  In such a case, when attempting to join these three members 102, 103, 105 by using a brazing method in which the molten brazing material is poured into the gaps between the respective members and solidified, the molten brazing material is It is supplied from a gap between the outer peripheral surface of the port 102 and the outer surface of the port 103.

  However, the brazing material flows into the gap between the port 103 and the outer peripheral surface of the portion of the seat member 105 extending to the inside of the port 103, and the brazing material enters the gap between the valve body 102 and the outer peripheral surface of the seat member 105. There is a phenomenon that does not flow smoothly. As a result, there is a risk of defective joint between the valve body 102 and the seat member 105.

  The above-mentioned problem is not limited to the motor-operated valve, but applies to an electrically driven valve having a valve body, a seat member, and a port member such as a solenoid valve.

  The present invention has been made to solve the above problems, and an object thereof is to provide an electrically driven valve capable of improving the flow of a brazing filler metal and ensuring the airtightness of a valve chamber. Especially.

  The electrically driven valve of the present invention comprises a valve body provided with a valve chamber, a tubular seat member provided with a valve port communicating with the valve chamber, and a cylindrical port member communicating with the valve port. The valve body is provided with an opening communicating with the valve chamber and a wall portion formed on a side of the opening opposite to the valve chamber, the one end portion of the seat member having the opening and A first spacing portion is formed between the wall portion that is fitted into the wall portion and faces the outer peripheral surface of the sheet member, and the port member is provided between the other end portion of the sheet member and the wall portion. Between the inner peripheral surface of the port member and the outer peripheral surface of the other end of the seat member, the inner peripheral surface of the port member and the outer peripheral surface of the other end of the seat member facing each other. A second separating portion is formed on the outer peripheral surface of the port member, and the wall facing the outer peripheral surface. A third spacing portion is formed between the first spacing portion and the second spacing portion, and the third spacing portion communicates with the first spacing portion and the second spacing portion, and the width of the first spacing portion is the first spacing portion. 2 is less than or equal to the width of the spacing portion, and the filled and solidified brazing material is provided in the third spacing portion and the first spacing portion, and the valve body, the seat member, and the port member are It is characterized by being integrally fixed.

  The width of the third spacer may be larger than the width of the first spacer.

  The port member may be inserted into the wall portion of the valve body.

  The sheet member may have an outer diameter that is substantially the same as the inner diameter of the wall portion.

  The second spacing portion is provided on the first spacing portion side as a gap between the inner circumferential surface of the port member and the outer circumferential surface of the other end portion of the sheet member. A small gap portion having a width smaller than the width of the second separating portion may be further provided on the other end side.

  The seat member has a large-diameter portion whose outer diameter is the maximum diameter, and a small-diameter portion that is smaller in diameter than the large-diameter portion and is inserted into the inside of the port member, and the small-diameter portion includes the port. You may make it provide the recessed part which forms the said 2nd space | interval part with the inner peripheral surface of a member.

  The concave portion of the small diameter portion may be provided adjacent to the large diameter portion.

  A cylindrical member connected to the valve body, and a stator externally mounted on the cylindrical member may be provided.

  ADVANTAGE OF THE INVENTION According to this invention, the flow of a brazing material can be improved and the electrically driven valve which can ensure the airtightness of a valve chamber can be obtained.

It is sectional drawing which shows the structure of the electrically operated valve which is an example of the electrically driven valve which concerns on embodiment. It is an expanded sectional view near the valve body of the electrically operated valve which is an example of the electrically driven valve concerning an embodiment. It is a partially expanded view of a valve body. It is an expanded sectional view near the valve chamber of the conventional electrically operated valve.

(Embodiment)
Hereinafter, embodiments of an electrically driven valve according to the present invention will be described in detail with reference to the drawings.

(Schematic configuration)
FIG. 1 is a cross-sectional view showing the configuration of a motor-operated valve that is an example of the electrically driven valve according to the embodiment. As shown in FIG. 1, the electrically driven valve according to this embodiment is an electrically operated valve 100. Note that, in FIG. 1, the stator, the coil, and the like of the stepping motor provided outside the cylindrical member 1 are omitted.

  The motor-operated valve 100 is used, for example, in an air conditioner, a refrigerator, a heat pump type cooling / heating system, and adjusts the flow rate of the refrigerant used in each device or system. The fluid whose flow rate is adjusted by the motor-operated valve 100 is, for example, a refrigerant.

  As shown in FIG. 1, the motor-operated valve 100 has a valve body 2, a first port 3, a second port 4, and a seat member 5. In this electrically operated valve 100, the first port 3 which is a fluid flow path is connected to the valve chamber 21 inside the valve body 2 through an orifice 51 formed in the seat member 5, and the first fluid flow path is provided. The two ports 4 are connected to the valve chamber 21, and the first port 3 and the second port 4 communicate with each other via the valve chamber 21. Therefore, the fluid flowing through the motor-operated valve 100 flows from the second port 4 to the first port 3 through the valve chamber 21. Alternatively, it flows from the first port 3 through the valve chamber 21 to the second port 4.

  The valve chamber 21 accommodates a valve body 7 that is tapered toward the orifice 51 and has a different waist circumference depending on the height from the tip. In the motor-operated valve 100, the opening degree of the orifice 51 communicating with the first port 3 is adjusted according to the insertion amount of the valve body 7 with respect to the orifice 51, so that the flow rate between the first port 3 and the second port 4 is adjusted. Is controlled. The valve body 7 is formed at the tip of the valve shaft 6 which is movable in the axial direction. The valve shaft 6 uses a stepping motor as a drive source, and axially moves in the direction of the first port 3 by a screw feed mechanism, whereby the insertion amount of the valve body 7 into the orifice 51 is controlled.

(Detailed configuration)
Such a motor-operated valve 100 includes a cylindrical member 1, a valve main body 2, and a stator that is externally mounted on the cylindrical member 1, and is configured by stacking the cylindrical member 1 and the valve main body 2. The cylindrical member 1 is also called a can and has a cup shape with one end surface closed. The other end surface of the cylindrical member 1 is provided with a disc-shaped brim-shaped member 1a having an opening, and the valve body 2 is inserted into the opening to seal the cylindrical member 1 so that the cylindrical member 1 is pressed. It becomes a container. Thus, the cylindrical member 1 and the valve body 2 are connected via the collar-shaped member 1a. However, the flange member 1a may not be provided, and the valve body 2 may have a shape in which the end on the side of the cylindrical member 1 is expanded in a flange shape, and the cylindrical member 1 and the valve body 2 may be connected.

  FIG. 2 is an enlarged cross-sectional view near the valve body 7 of the electric valve 100. FIG. 3 is a partially enlarged view of the valve body 2. As shown in FIGS. 2 and 3, the valve body 2 has a valve chamber 21 that is an internal space, and the valve shaft 6 is housed in the valve chamber 21. As shown in FIG. 3, the valve body 2 is provided with a recess 22 provided with a step communicating with the valve chamber 21. An opening 22a is provided on the bottom surface of the recess 22, and the opening 22a communicates with the valve chamber 21. The recess 22 has a wall that stands upright from the bottom surface, and the wall is provided with a step 22b in which the inner diameter of the recess 22 increases. That is, if the wall of the recess 22 closer to the valve chamber 21 than the step 22b is the wall 22c, and the part farther from the valve chamber 21 than the step 22b is the wall 22d, the walls 22c and 22d are the inner circumference of the recess 22. The inner diameter of the recessed portion 22 which forms the surface and is defined by the wall 22d is larger than the inner diameter of the recessed portion 22 defined by the wall 22c.

  As shown in FIG. 2, the seat member 5 has a tubular shape, is provided coaxially with the valve shaft 6 and the valve body 7, and has one end fitted into the opening 22a and the walls 22c and 22d of the recess 22 of the valve body 2. ing. The seat member 5 is provided with a valve opening 52 whose internal space communicates with the valve chamber 21, the valve body 7 is accommodated in the valve opening 52, and the opening degree of the orifice 51 is adjusted by raising and lowering the valve body 7. ..

  The valve opening 52 is expanded in a multi-step manner from the valve shaft 6 toward the valve body 7, and is defined by the inner peripheral surface of the seat member 5. That is, the valve opening 52 has the first valve opening portion 521, the second valve opening portion 522, the tapered surface portion 522a, the third valve opening portion 523, and the tapered surface portion 523a in order from the valve shaft 6 side. The first valve opening portion 521 has a cylindrical shape and is provided adjacent to the valve chamber 21. An orifice 51 is provided at the end of the first valve opening 521 on the valve chamber 21 side. The second valve opening 522 is provided in a larger diameter than the first valve opening 521 following the first valve opening 521, and the third valve opening 523 is provided in a diameter larger than the second valve opening 522. ing. The tapered surface portion 522a has a truncated cone shape, connects the second valve opening portion 522 and the third valve opening portion 523, and the tapered surface portion 523a has a truncated cone shape, and the diameter increases continuously from the third valve opening portion 523. However, it is provided up to the end of the sheet member 5.

  On the other hand, the outer shape of the seat member 5 will be described. The seat member 5 has a tip portion 53, a large diameter portion 54, and a small diameter portion 55 in the direction from the valve shaft 6 to the valve body 7. The tip portion 53 has a substantially cylindrical shape and is inserted into the opening 22 a of the recess 22.

  The large-diameter portion 54 is provided subsequent to the tip portion 53 and is a portion of the seat member 5 having the largest outer diameter. The large-diameter portion 54 projects in a direction orthogonal to the axis, abuts on the bottom surface of the recess 22, and the outer peripheral surface faces the wall 22c of the recess 22 with a space therebetween. A first spacing S1 is formed between the outer peripheral surface of the large diameter portion 54 and the wall 22c of the recess 22. In other words, the first distance, which is the distance between the outer peripheral surface of the large diameter portion 54 and the wall 22c, is provided. The width of the first spacing portion S1 is the first distance. The axial thickness of the large-diameter portion 54 is substantially the same as the distance between the bottom surface of the recess 22 and the step portion 22b.

  The small diameter portion 55 is provided following the large diameter portion 54 and has a smaller diameter than the large diameter portion 54 and is inserted into the first port 3. The small diameter portion 55 is provided with a recess 55a. The recess 55a is a portion that is recessed around the axis. The concave portion 55a is provided adjacent to the large diameter portion 54 here.

  The first port 3 is a cylindrical member. The first port 3 extends coaxially with the central axes of the cylindrical member 1, the valve shaft 6 and the valve body 7, and its end portion is in an annular space between the wall 22d of the recess 22 and the outer peripheral surface of the small diameter portion 55. It is plugged in. Due to this insertion, the inner peripheral surface of the first port 3 and the small diameter portion 55 that is the other end of the seat member 5 face each other with a space therebetween, and a gap is formed between the inner peripheral surface of the first port 3 and the small diameter portion 55. Is formed. As the gap, there are a large gap portion which is provided on the first separation portion S1 side and is equal to or larger than the first separation portion S1 and a gap which is deeper in the first port 3 than the large gap portion and larger than the large gap portion. A small small gap S20 is provided. The large gap portion is a second separation portion S2 formed between the bottom surface of the recess 55a and the inner peripheral surface of the first port 3. In other words, the second distance, which is the distance between the bottom surface of the recess 55a and the inner peripheral surface of the first port 3, is provided. The width of the second spacing portion S2 is the second distance. The second spaced portion S2 is adjacent to the large diameter portion 54. Further, the small gap portion S20 is a gap formed between the portion of the small diameter portion 55 where the recess 55a is not provided and the inner peripheral surface of the first port 3.

  Further, the wall 22d of the recess 22 and the outer peripheral surface of the first port 3 are spaced apart and face each other, and a third spacing S3 is formed between them. In other words, the third distance, which is the distance between the wall 22d of the recess 22 and the outer peripheral surface of the first port 3, is provided. The width of the third spacing S3 is the third distance. The first spacing S1, the second spacing S2, and the third spacing S3 are in communication with each other, and the width of the first spacing S1 is less than or equal to the width of the second spacing S2. That is, the first distance is less than or equal to the second distance. Further, here, the width of the third separating portion S3 is equal to or smaller than the width of the first separating portion S1, that is, the third distance is equal to or smaller than the first distance. In other words, the outer diameter of the first port 3 and the inner diameter of the recess 22 defined by the wall 22d are substantially the same, and the end of the first port 3 is defined by the wall 22d. It is plugged into 22. Note that “substantially the same” means that the brazing filler metal flows to the extent that the third spacing S3 is formed.

  Filled and solidified brazing filler metal is provided in the third separating portion S3 and the first separating portion S1, and the valve body 2, the seat member 5, and the first port 3 are integrally fixed. ing.

  The second port 4 is a cylindrical member. The second port 4 is connected to the side surface of the valve body 2, the inside of the second port 4 communicates with the valve chamber 21, and extends orthogonal to the extending direction of the first port 3.

  Further, as shown in FIG. 1, the valve shaft 6 is arranged coaxially with the central axis of the cylindrical member 1 and has a rod shape. The valve shaft 6 protrudes from the inside of the cylindrical member 1 into the valve chamber 21 through the opening of the cylindrical member 1 and the through hole 24 of the valve body 2, and its tip reaches the upper end of the seat member 5. The valve body 7 is formed at the tip of the valve shaft 6 that reaches the seat member 5. The valve body 7 is formed by reducing the diameter of the valve shaft 6 toward the tip and is inserted into the seat member 5.

  That is, when the valve shaft 6 is moved in the axial direction by the screw feed mechanism provided in the cylindrical member 1, the amount of entry of the valve body 7 into the orifice 51 changes. When the taper amount of entry of the valve body 7 changes, the cross-sectional area of the gap defined by the outer peripheral surface of the valve body 7 and the inner peripheral surface of the orifice 51 changes according to the entrance amount. Therefore, the size of the inlet / outlet of the first port 3 changes, and the flow rate between the first port 3 and the second port 4 changes via the valve chamber 21.

  The valve shaft 6 is supported by a guide bush 8 so as to be rotatable and vertically movable. The guide bush 8 supports the circumferential surface of the valve shaft 6 over a long range, and guides the valve body 7 to the orifice 51 while restricting radial fluctuation and shaft inclination. The guide bush 8 is arranged coaxially with the valve shaft 6 and has a cylindrical shape with a clearance to cover the valve shaft 6. However, both ends of the valve shaft 6 project from the guide bush 8. The clearance is such that the valve shaft 6 can move in the axial direction while maintaining highly accurate regulation. The guide bush 8 is arranged in the cylindrical member 1 and partially protrudes from the inside of the cylindrical member 1. That is, in the valve body 2, a large-diameter support hole 23 for fixing the guide bush 8 to the cylindrical member 1 side of the valve chamber 21, and a small-diameter through hole 24 through which the valve shaft 6 passes on the bottom surface of the support hole 23. Is provided. The protruding portion of the guide bush 8 is press-fitted into this support hole 23.

  A fixing screw 8a which is a male screw is formed on the outer circumference of the guide bush 8. On the other hand, a valve shaft holder 9 arranged in the cylindrical member 1 is screwed into the guide bush 8. That is, the valve shaft holder 9 is a cylindrical body having a perforated ceiling portion 9b on the bottomed end surface of the cylindrical member 1, and a movable screw 9a, which is a female screw, is formed on the inner periphery of the valve shaft holder 9. ing. The fixed screw 8a of the guide bush 8 and the movable screw 9a of the valve shaft holder 9 are screwed together. As a result, the valve shaft holder 9 can move in the axial direction while rotating around the guide bush 8.

  A stepping motor rotor 10 is coaxially provided on the outer periphery of the valve shaft holder 9. The rotor 10 has a cylindrical shape, and a support body that supports the valve shaft holder 9 extends on the inner peripheral surface. A mounting hole 10a of the valve shaft holder 9 is opened in this support, and the rotor 10 and the valve shaft holder 9 are fixed by fitting the valve shaft holder 9 into the mounting hole 10a.

  The rear end of the valve shaft 6 toward the bottom of the cylindrical member 1 projects from the guide bush 8 and also from the opening of the ceiling 9b of the valve shaft holder 9. A push nut 12 is fixed to the projecting portion by means such as press fitting or welding via a washer-shaped rotor retainer 11 that expands in the radial direction of the cylindrical member 1. Further, the valve shaft 6 has a stepped portion 6a formed with a one-step smaller diameter from the middle of the shaft to the rear end, and between the stepped portion 6a and the ceiling portion 9b of the valve shaft holder 9, the valve shaft 6 is provided. A compression coil spring 14 fitted in the is installed.

  The compression coil spring 14 biases the valve shaft holder 9 toward the push nut 12 side. Therefore, the rotor retainer 11 and the ceiling portion 9b of the valve shaft holder 9 are elastically sandwiched by the compression coil spring 14 and the push nut 12, and the valve shaft holder 9, the rotor retainer 11, the push nut 12, The valve shaft 6 is integrated with the rotor 10 and rotates with the rotor 10. Then, the valve shaft holder 9 is moved in the axial direction with the rotation by the screwing of the movable screw 9a of the valve shaft holder 9 and the fixing screw 8a of the guide bush 8, and the valve integrated with the valve shaft holder 9 is rotated. The shaft 6 also moves in the axial direction.

  A return spring 13 is fitted around the push nut 12. The return spring 13 is a valve shaft holder that is integrated with the valve shaft 6 when the return spring 13 contacts the ceiling portion of the cylindrical member 1 and is compressed when the valve shaft 6 moves to the bottomed side of the cylindrical member 1. The movable screw 9a of 9 and the fixing screw 8a of the guide bush 8 are urged in a direction to engage with each other.

  Further, a lower stopper 15 is fixed below the fitting portion of the guide bush 8 into which the valve shaft holder 9 is fitted. The lower stopper 15 is fixed to the guide bush 8 by, for example, screwing a female screw provided inside the lower stopper 15 into the fixing screw 8a. A stopper 9c is integrally provided below the valve shaft holder 9. The stopper 9c contacts the lower stopper 15 when the valve shaft holder 9 reaches the lowest position, and restricts further rotation and lowering of the valve shaft holder 9.

  In the motor-operated valve 100 having such a configuration, by moving the valve shaft 6 up and down, the valve body 7 provided at the tip of the valve shaft 6 is inserted inside the orifice 51, and the gap between the two is opened and closed. The movement of fluid between the first port 3 and the second port 4 is restricted.

  The lifting and lowering of the valve shaft 6 is performed as follows. When a coil (not shown) provided on the outer circumference of the cylindrical member 1 is energized, the rotor 10 rotates. The rotation of the rotor 10 is transmitted to the valve shaft holder 9 fixed to it, and the valve shaft holder 9 rotates around the outer periphery of the guide bush 8 fixed to the valve body 2. Since the valve shaft holder 9 and the guide bush 8 are screwed together by the movable screw 9a and the fixed screw 8a, the valve shaft holder 9 descends with its rotation, and accordingly, the valve shaft holder 9 and the compression coil spring 14 clamp it. The valve shaft 6 is also lowered.

  As the valve shaft 6 descends in this way, the valve element 7 at the tip of the valve shaft 6 enters the orifice 51, the gap between the two narrows, and finally the two come into close contact with each other. Will be closed.

(Action)
The operation of the electrically driven valve according to the embodiment will be described with reference to FIG.

  The motor-operated valve 100 as described above is manufactured by integrally brazing the valve body 2, the seat member 5, and the first port 3. That is, the seat member 5 is fitted into the recess 22 of the valve body 2 which is turned upside down in FIG. 2 by inserting the tip portion 53 into the opening 22a, and then the wall 22d of the recess 22 and the seat member 5 (small diameter portion 55). The end portion of the first port 3 is inserted into the space formed between the first port 3 and the outer peripheral surface of As a result, the end surface 31 of the first port 3, the step portion 22b, and the lower surface of the large diameter portion 54 are located on the same plane. However, there is a local gap between the end surface of the first port 3 and the lower surface of the step portion 22b and the large diameter portion 54 to the extent that the brazing material flows. Further, the upper surface of the large-diameter portion 54 of the seat member 5 is in surface contact with the bottom surface of the recess 22, and the seat member 5 is sandwiched between the valve body 2 and the first port 3.

  Further, since the end surface 31 of the first port 3 faces the lower surfaces of the step portion 22b and the large diameter portion 54, the end surface 31 of the first port 3 continues from the outside of the first port 3 to the front side of the end surface 31 continuing from the third separating portion S3. The flow path branches at the step portion 22b facing the end surface 31 of the first port 3 into the first separation portion S1 side and the second separation portion S2 side.

  The brazing filler metal which is heated and melted is poured into the third spacing S3 between the wall 22d of the recess 22 and the first port 3. The third spacing portion S3 branches into a first spacing portion S1 side and a second spacing portion S2 side at the step portion 22b, and communicates with the first spacing portion S1 and the second spacing portion S2. ing.

  In the present embodiment, the width of the first separating portion S1 is less than or equal to the width of the second separating portion S2, so that the brazing filler metal that has entered the third separating portion S3 has the first separating portion due to the capillary phenomenon. It flows into S1. On the other hand, it does not flow or does not easily flow into the second spacing S2. In this way, the flow of the brazing material is improved by controlling the path of the brazing material.

  Further, since the second separation portion S2 is provided adjacent to the large diameter portion 54, it is formed by the inner peripheral surface of the first port 3 and the outer peripheral surface of the seat member 5 facing the inner peripheral surface. The brazing material is prevented from flowing into the gap.

  When the brazing material is filled in the third separating portion S3 and the first separating portion S1 and the brazing material is cooled, the brazing material is solidified, and the valve body 2, the seat member 5, and the first port 3 are integrated. Fixed. In this way, by brazing between the valve main body 2 and the seat member 5, and between the valve main body 2 and the first port 3, the fluid flows to the first separating portion S1 and the third separating portion S3. Does not flow, and the airtightness of the valve chamber 21 is maintained.

(effect)
The electrically driven valve of this embodiment includes a valve body 2 provided with a valve chamber 21, a tubular seat member 5 provided with a valve opening 52 communicating with the valve chamber 21, and a cylinder communicating with the valve opening 52. The valve body 2 is provided with a recess 22 having an opening 22a in the bottom surface and communicating with the valve chamber 21, and one end of the seat member 5 is fitted into the recess 22. A first separating portion S1 is formed between the outer peripheral surface of the seat member 5 and the inner peripheral surface of the concave portion 22 facing the seat member 5, and the end portion of the first port 3 is formed between the other end portion of the seat member 5 and the concave portion 22. The inner peripheral surface of the first port 3 and the outer peripheral surface of the other end of the seat member 5 face each other, and the inner peripheral surface of the first port 3 and the outer peripheral surface of the other end of the seat member 5 are inserted. The second separating portion S2 is formed, and is formed between the outer peripheral surface of the first port 3 and the wall 22d of the recess 22 facing the outer peripheral surface. Three spacing portions S3 are formed, the third spacing portion S3 communicates with the first spacing portion S1 and the second spacing portion S2, and the width of the first spacing portion S1 is equal to that of the second spacing portion S2. It was less than the width.

  As a result, the brazing filler metal that has flowed into the third separation portion S3 is provided such that the width of the first separation portion S1 is less than or equal to the width of the second separation portion S2. Advance to the separating portion S1. Therefore, the valve body 2, the seat member 5, and the first port member 3 are integrated with the brazing material without causing a defective joint, and the airtightness of the valve chamber 21 can be maintained.

  Since the brazing material flows from the third separating portion S3 to the first separating portion S1, the three members 2, 3 and 5 can be integrated by one brazing operation, and the valve body 2 and the seat member can be integrated. It is not necessary to perform two brazing operations, such as brazing with 5 and brazing with the valve body 2 and the first port 3, and it is possible to reduce the man-hour and time required for brazing, It is possible to improve the sex.

  The first port 3 was inserted into the recess 22 of the valve body 2. Thus, before brazing, the valve body 2, the first port 3, and the seat member 5 housed in the recess 22 of the valve body 2 are sandwiched between the valve body 2, the seat member 5, and the first port 3. Can be integrated. Therefore, in the manufacturing process of the motor-operated valve 100, even if vibration is applied when the integrated three members 2, 3, 5 before brazing are applied, the three members 2, 3, 5 are disassembled and disassembled. The situation can be prevented and the productivity can be improved.

  The seat member 5 has an outer diameter substantially the same as the inner diameter of the recess 22 of the valve body 2. As a result, the seat member 5 can be inserted into the recess 22 and the assemblability of the valve body 2 and the seat member 5 can be improved.

  As a gap between the inner peripheral surface of the first port 3 and the outer peripheral surface of the other end of the sheet member 5, a second separating portion S2 is provided on the first separating portion S1 side, and a second separating portion S2. A small gap portion S20 having a width smaller than that of the second spacing portion S2 is further provided on the other end side of the.

  As a result, the thickness of the other end portion of the seat member 5 inserted into the first port 3 below the second separation portion S2 can be increased, and the degree of freedom in designing the shape of the valve opening 52 can be increased. Can be improved. For example, in the present embodiment, the diameter of the valve opening 52 is sequentially increased in three stages inside the seat member 5 in consideration of the noise reduction. Due to the shape of the valve opening 52, the refrigerant pressure when passing through the valve opening 52 is increased. Is gradually recovered, the pressure fluctuation is suppressed, and the refrigerant is rectified. Since the thickness of the seat member 5 below the second separating portion S2 is increased, the degree of freedom in designing the shape of the valve opening 52 can be improved.

  Further, if the gap between the inner peripheral surface of the first port 3 and the small diameter portion 55 is large, the fluid may enter the gap and generate a vortex to hinder the quietness. However, the small gap portion S20 is provided. As a result, it is possible to suppress the entry of the fluid and improve the quietness.

  The seat member 5 has a large-diameter portion 54 whose outer diameter is the maximum diameter and a small-diameter portion 55 which is smaller in diameter than the large-diameter portion 54 and is inserted into the inside of the first port 3. The concave portion 55a that forms the second separating portion S2 is provided between the inner peripheral surface of the first port 3 and the inner peripheral surface. By adopting this structure, since the recess 55a can be provided from the outside of the sheet member 5 by cutting or the like, the processing is facilitated and the productivity can be improved.

  The recess 55a of the small diameter portion 55 is provided adjacent to the large diameter portion 54. As a result, it is possible to prevent the brazing material from entering the second separating portion S2 and reduce the amount of the brazing material used. In other words, coupled with the capillarity caused by the first separating portion S1, the brazing material that penetrates into the second separating portion S2 is guided to the first separating portion S1 to fix the valve body 2 and the seat member 5. Can be made stronger.

(Other embodiments)
The present invention is not limited to the above-mentioned embodiment, and includes other embodiments described below. Further, the present invention also includes a form in which the above-described embodiment and the following other embodiments are all or any combination thereof. Furthermore, various omissions, substitutions, and changes can be made to these embodiments without departing from the scope of the invention, and modifications thereof are also included in the present invention. In the following other embodiments, parts different from the above embodiment will be described, and the same parts as those in the above embodiment will be denoted by the same reference numerals and description thereof will be omitted.

Although the electrically driven valve is described as the electrically operated valve 100 in the above embodiment, the invention is not limited to this. For example, the electrically driven valve may be a solenoid valve. In this way, the drive mechanism for raising and lowering the valve body 7 of the electrically driven valve may raise and lower the valve shaft 6 and the valve body 7 by the electromagnetic force generated by the solenoid.

  In the above embodiment, the width of the third spacing S3 is set to be equal to or less than the width of the first spacing S1. However, the width of the third spacing S3 is not limited to this. The width of the first separating portion S1 may be made larger and smaller than the width of the third separating portion S3. As a result, the width of the first spacing portion S1 is smaller than the widths of both the second spacing portion S2 and the third spacing portion S3, so that the brazing filler metal during brazing becomes the first spacing portion S1. It is easy to advance, and the valve body 2, the seat member 5, and the first port 3 can be fixed more firmly.

  In the above-described embodiment, the second separation portion S2 is formed by providing the recess 55a in the small diameter portion 55, but it may be formed by providing the recess 55a in the inner peripheral surface of the first port 3. As a result, the thickness of the seat member 5 orthogonal to the axial direction can be increased, so that the degree of freedom in designing the valve opening 52 formed inside the seat member 5 can be improved.

  Further, although the recess 55a is provided adjacent to the large diameter portion 54, it may not be necessarily adjacent to the recess 55a and may be separated from the large diameter portion 54 if the first spacing portion S1 is smaller than the second spacing portion S2. May be provided. Even in this case, the brazing material can be caused to flow to the first separating portion S1 by the capillary phenomenon.

100 Motorized valve 1 Cylindrical member 1a Collar member 2 Valve body 21 Valve chamber 22 Recess 22a Opening 22b Step 22c Wall 22d Wall 23 Support hole 24 Through hole 3 First port 31 End surface 4 Second port 5 Seat member 51 Orifice 52 Valve Port 521 First valve port 522 Second valve port 522a Tapered surface 523 Third valve port 523a Tapered surface 53 Tip 54 Large diameter 55 Small diameter 55a Recess 6 Valve shaft 6a Step 7 Valve body 8 Guide bush 8a Fixing screw 9 Valve shaft holder 9a Movable screw 9b Ceiling portion 9c Stopper 10 Rotor 10a Mounting hole 11 Rotor retainer 12 Push nut 13 Return spring 14 Compression coil spring 15 Lower stopper S1 First spacing S2 Second spacing S3 Third Separation part S20 Small gap part

Claims (8)

A valve body provided with a valve chamber,
A tubular seat member provided with a valve opening communicating with the valve chamber,
A cylindrical port member communicating with the valve opening,
Equipped with
The valve body is provided with an opening communicating with the valve chamber on the bottom surface and a wall portion formed on the opposite side of the opening from the valve chamber,
One end portion of the sheet member is fitted into the opening and the wall portion, and a first spacing portion is formed between the outer peripheral surface of the sheet member and the wall portion facing the outer peripheral surface,
The end of the port member is inserted between the other end of the sheet member and the wall, and the inner peripheral surface of the port member and the outer peripheral surface of the other end of the sheet face each other, and the port member A second separating portion is formed between the inner peripheral surface of the sheet and the outer peripheral surface of the other end of the sheet member,
A third spacing portion is formed between the outer peripheral surface of the port member and the wall portion facing the outer peripheral surface,
The third spacing portion communicates with the first spacing portion and the second spacing portion,
The width of the first spacing portion is less than or equal to the width of the second spacing portion,
Filled and solidified brazing material is provided in the third spacing portion and the first spacing portion, and the valve body, the seat member, and the port member are integrally fixed.
An electrically driven valve characterized by. The width of the third spacing portion is greater than the width of the first spacing portion,
The electrically driven valve according to claim 1, wherein: The port member is inserted into the wall portion of the valve body,
The electrically driven valve according to claim 1, wherein: The sheet member has an outer diameter substantially the same as the inner diameter of the wall portion,
The electrically driven valve according to any one of claims 1 to 3, characterized in that: As a gap between the inner peripheral surface of the port member and the outer peripheral surface of the other end of the sheet member,
The second spacing portion is provided on the first spacing portion side, and a small gap portion having a width smaller than the width of the second spacing portion is further provided on the other end portion side of the second spacing portion. That the
The electrically driven valve according to any one of claims 1 to 4. The sheet member is
A large diameter part whose outer diameter is the maximum diameter,
A small diameter portion having a smaller diameter than the large diameter portion and inserted into the inside of the port member,
Have
The small diameter portion is provided with a concave portion that forms the second spacing portion with the inner peripheral surface of the port member,
The electrically driven valve according to claim 5, wherein The concave portion of the small diameter portion is provided adjacent to the large diameter portion,
7. The electrically driven valve according to claim 6, wherein A cylindrical member connected to the valve body,
A stator externally mounted on the cylindrical member,
Is equipped with,
The electrically driven valve according to any one of claims 1 to 7.

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