JP6387494B2 - Butterfly valve - Google Patents

Description

  The present invention relates to a butterfly valve.

  The butterfly valve has a simple configuration in which a plate-like valve body is assembled to a shaft, and can be realized at a relatively low cost. For this reason, it is installed in water circuits, such as a hot-water supply apparatus, and is used for opening and closing and switching of a flow path (for example, refer patent document 1). Such a butterfly valve has, for example, an elliptical valve body, and is assembled so that the minor axis direction matches the axial direction of the shaft.

JP 2011-89581 A

  Such a butterfly valve may be configured as a switching valve capable of switching a plurality of flow paths. In that case, at least the first passage and the second passage are provided in the body of the butterfly valve, and for example, a valve body is disposed at a connection portion between the first passage and the second passage. In order to perform reliable switching of the flow path in such a configuration, the sectional area of the opening end of the second passage to the first passage must be smaller than that of the valve body. As a result, there is a problem that a sufficient flow rate of the fluid passing through the second passage cannot be obtained, or an undesirable pressure loss occurs when the fluid flows from one of the first passage and the second passage to the other. In order to solve such a problem, for example, the major axis of the valve body may be increased and the second passage may be increased correspondingly. However, the operating torque of the valve body may be increased unnecessarily, and preferably Absent.

  One of the objects of the present invention is to provide a butterfly valve capable of ensuring a necessary flow rate without enlarging a valve body.

  One embodiment of the present invention is an electric butterfly valve. This butterfly valve has a body having a passage for allowing fluid to pass through, a shaft supported by the body so as to be rotatable around its own axis, a shaft extending in the radial direction of the passage, and a state assembled to the shaft. A valve body that is disposed in the passage and is capable of adjusting the open / close state or opening degree of the passage by rotating together with the shaft, and an actuator that rotates the shaft by energization are provided.

  The passage includes a first passage and a second passage connected so as to intersect the first passage, and the valve element is disposed at a connection portion of the first passage with the second passage, and the first passage causes the first passage. The communication state between the first passage and the second passage can be adjusted, and the opening end portion of the second passage to the first passage has a cross section whose opening width is smaller in the direction perpendicular to the axial direction of the shaft.

  According to this aspect, in the configuration in which the valve element is arranged in the first passage in the butterfly valve, the opening end portion of the second passage to the first passage has a cross section whose opening width is smaller in the direction perpendicular to the axial direction of the shaft. Have. Thus, by making the lateral width of the opening end portion relatively small, it is possible to secure a seating surface region on which the valve body is seated without increasing the major axis of the valve body. On the other hand, by making the vertical width of the opening end portion relatively large, it becomes possible to pass a fluid having a sufficient flow rate. That is, the required flow rate can be ensured without enlarging the valve body.

  ADVANTAGE OF THE INVENTION According to this invention, the butterfly valve which can ensure a required flow volume without enlarging a valve body can be provided.

It is a figure showing the structure of the butterfly valve which concerns on 1st Embodiment. It is a figure showing the structure of the butterfly valve which concerns on 1st Embodiment. It is a figure showing the structure of the butterfly valve which concerns on 1st Embodiment. It is a figure which shows a valve body and its peripheral structure. It is a figure which shows a valve body and its peripheral structure. It is a figure which shows a valve body and its peripheral structure. It is a partial expanded sectional view which shows the structure of the principal part of the butterfly valve which concerns on the modification of 1st Embodiment. It is a partial expanded sectional view which shows the structure of the principal part of the butterfly valve which concerns on 2nd Embodiment. It is a partial expanded sectional view which shows the structure of the principal part of the butterfly valve which concerns on 3rd Embodiment. It is a partial expanded sectional view which shows the structure of the principal part of the butterfly valve which concerns on 4th Embodiment. It is a figure which shows the structure of the principal part of the butterfly valve which concerns on 5th Embodiment. It is a figure which shows the structure of the principal part of the butterfly valve which concerns on the modification of 5th Embodiment. It is a figure showing the effect of 5th Embodiment and its modification. It is a front view showing the structure of the butterfly valve which concerns on a modification.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, for the sake of convenience, the positional relationship between the structures may be expressed as upper and lower with reference to the illustrated state.

[First Embodiment]
In this embodiment, the butterfly valve is configured as a switching valve applied to the refrigeration cycle of the vehicle air conditioner. The vehicle air conditioner includes a refrigeration cycle in which a compressor, a condenser, an expansion device, an evaporator, and the like (not shown) are connected by piping, and the air conditioner in the vehicle cabin is in the process of circulating refrigerant while changing the state in the refrigeration cycle. I do. As the refrigerant, for example, HFC-134a, HFO-1234yf, or the like is employed. The butterfly valve is installed at a predetermined position of the refrigeration cycle and functions as a three-way valve capable of switching the refrigerant flow path.

  1-3 is a figure showing the structure of the butterfly valve which concerns on 1st Embodiment. 1A is a front view, and FIG. 1B is a bottom view. 2A is a cross-sectional view taken along the line AA in FIG. 1B, and FIG. 2B is a cross-sectional view taken along the line BB in FIG. 2A. 3A is a cross-sectional view taken along the line CC in FIG. 2A, and FIG. 3B is an enlarged view of a portion E in FIG. 3A.

  As shown in FIGS. 1A and 1B, the butterfly valve 10 is configured by integrally assembling a body 12 that accommodates a valve portion and an actuator 14 that drives the valve portion. As the actuator 14, a DC motor, a stepping motor, or other electric actuator can be adopted, but a detailed description thereof will be omitted.

  As shown in FIG. 2A, the butterfly valve 10 is accommodated in a body 12 and can adjust the open / close state of the refrigerant passage 16 (the flow path can be switched), and the center of rotation of the valve body 18. A shaft 20 is provided. The shaft 20 is connected to a rotating mechanism 22 (rotating shaft) of the actuator 14. The body 12 is obtained, for example, by cutting a metal material such as an aluminum alloy or brass.

  As shown in FIG. 2B, the body 12 has a T-shaped cross section, and the refrigerant passage 16 is a T-shaped passage. That is, the refrigerant passage 16 includes a linear first passage 24 that penetrates the body 12 and a second passage 26 that is connected to the first passage 24 at a right angle. One end of the second passage 26 is provided with an introduction port 30 for introducing the refrigerant from the upstream side. On the other hand, a first outlet port 32 is provided at one end of the first passage 24, and a second outlet port 34 is provided at the other end. The valve body 18 is disposed at a connection point between the first passage 24 and the second passage 26. The refrigerant introduced through the introduction port 30 can be led out from the first lead-out port 32 or the second lead-out port 34 according to the rotational position of the valve body 18.

  As shown in FIG. 1A, the opening end portion 28 of the second passage 26 to the first passage 24 has a cross section whose opening width is smaller in the direction perpendicular to the axial direction of the shaft 20. In the present embodiment, as shown in the drawing, an elliptical shape (non-circular shape) that is long in the vertical direction is used. Thus, by making the lateral width of the opening end portion 28 relatively small, it is possible to secure a seating surface region on which the valve element 18 is seated without increasing the major axis of the valve element 18. On the other hand, by making the vertical width of the opening end portion 28 relatively large, it becomes possible to allow a refrigerant having a sufficient flow rate to pass therethrough. That is, the required flow rate can be ensured without enlarging the valve body 18.

  Returning to FIG. 2A, the body 12 has a partition wall 35 that partitions the working chamber 33 in which the mechanism of the actuator 14 is disposed and the refrigerant passage 16. An insertion hole 36 for inserting the shaft 20 is provided so as to penetrate the partition wall 35. The body 12 is also provided with a bearing hole 38 that faces the insertion hole 36 across the refrigerant passage 16. The bearing hole 38 is formed coaxially with the insertion hole 36 and supports the lower end portion of the shaft 20. That is, the shaft 20 extends so as to cross the refrigerant passage 16 in the radial direction, and is supported by the body 12 so as to be rotatable around its own axis.

  The insertion hole 36 is a stepped hole whose diameter is reduced in a plurality of steps from the upper side to the lower side, and a large diameter portion 40, a medium diameter portion 42, and a small diameter portion 44 are continuously provided from the upper stage. An internal thread portion 46 is formed in the large diameter portion 40. A stepped cylindrical shaft support member 48 is fixed to the upper half of the insertion hole 36. The shaft 20 is supported by the shaft support member 48 and the bearing hole 38 so as to be rotatable around the axis. The shaft support member 48 has a male screw portion 50 formed in the upper half thereof. The shaft support member 48 can be fixed to the body 12 by screwing the male screw portion 50 into the female screw portion 46 and fastening them. The lower half portion of the shaft support member 48 is inserted into the medium diameter portion 42. The inner side of the shaft support member 48 is a stepped circular hole, and the stepped portion 52 functions as a stopper that restricts the upward displacement of the shaft 20.

  A shaft seal member 54 in which O-rings and backup rings are alternately stacked is provided in the lower half of the middle diameter portion 42. That is, the shaft seal member 54 is configured by arranging an O-ring 56, a backup ring 58, an O-ring 60, and a backup ring 62 from below. The shaft seal member 54 is disposed between the bottom surface of the medium diameter portion 42 and the bottom surface of the shaft support member 48, and in particular, O-rings 56 and 60 are interposed between the medium diameter portion 42 and the shaft 20. Thus, leakage of the refrigerant from the refrigerant passage 16 side to the working chamber 33 side is regulated. Oil is sealed in a gap space 64 formed between the shaft seal member 54 and the valve body 18. This oil has a function of enhancing the sealing performance in cooperation with the shaft seal member 54, and details thereof will be described later.

  As shown in FIG. 3A, the shaft 20 has a stepped columnar shape, and is assembled to the valve body 18 so that the lower half of the shaft 20 penetrates the valve body 18. The diameter of the upper half of the shaft 20 is reduced stepwise, and the stepped portion 66 can be locked by the stepped portion 52 of the shaft support member 48. As shown in FIG. 3B, the shaft 20 is provided with a recess 68 on the outer peripheral surface of a portion located in the small diameter portion 44, and the portion is a reduced diameter portion 70. Oil is sealed in a gap space 64 surrounded by the reduced diameter portion 70 and the small diameter portion 44. If the refrigerant in the refrigerant passage 16 enters the insertion hole 36, the leakage of the refrigerant cannot be completely prevented by the shaft seal member 54 alone. This is because a resin material such as an O-ring cannot prevent refrigerant leakage.

  Accordingly, in the present embodiment, oil is sealed in the gap space 64 between the valve body 18 and the shaft seal member 54, thereby suppressing the refrigerant flow to the shaft seal member 54 side. However, refrigeration oil, that is, oil used for lubrication of a compressor or the like is used as oil so that no problem occurs even if the oil leaks into the refrigerant passage 16. For example, when HFC-134a is used as the refrigerant, polyalkylene glycol (PAG) or the like can be employed. When HFO-1234yf is used, polyol ester (POE) or the like can be employed.

  The valve body 18 is not fixed in the axial direction with respect to the shaft 20, and movement in the axial direction is restricted by the inner surface of the refrigerant passage 16. That is, a pair of flat surfaces 71 are formed by cutting on the inner wall surface of the refrigerant passage 16 facing the upper end surface and the lower end surface of the valve body 18, and the axial direction of the valve body 18 is formed by these flat surfaces 71. Movement to is regulated. For cutting the flat surface 71, for example, machining by a machining center, an internal broach, or the like can be employed.

  When the valve body 18 is rotated about 45 degrees from the state shown in FIG. 2B, the outer peripheral portion thereof abuts along the inner peripheral surface of the refrigerant passage 16 (at least partially adheres). Thereby, the passage on the first lead-out port 32 side or the passage on the second lead-out port 34 side is closed, and the seal in the closed state (valve closed state) is realized. That is, the valve body 18 can be rotated in one direction (counterclockwise in the figure) or in the opposite direction (clockwise in the figure) from a state along the axis of the refrigerant passage 16 (see dotted lines and wavy lines in the figure). The actuator 14 is rotationally driven. In the state of the dotted line in the figure, the first flow path connecting the introduction port 30 and the first derivation port 32 is opened, and the second flow path connecting the introduction port 30 and the second derivation port 34 is closed (blocked). On the other hand, in the wavy line state in the figure, the second flow path is opened and the first flow path is closed (blocked).

  Next, the detail of the structure of the valve body 18 is demonstrated. 4-6 is a figure which shows the valve body 18 and its periphery structure. 4A is a front view showing a connection structure between the valve body 18 and the shaft 20, and FIG. 4B is a cross-sectional view taken along line FF in FIG. 4A. FIG. 5A is a diagram showing the configuration of the plate constituting the valve element 18, and FIG. 5B is a cross-sectional view taken along the line GG in FIG. 5 (C) to 5 (E), 6 (A), and 6 (B) are diagrams showing a manufacturing process of the valve body 18. FIG. 6C is a cross-sectional view taken along the line HH in FIG. 6B, and FIG. 6D is an enlarged view of a portion I in FIG. 6C. FIG. 6E is an enlarged view of a portion D in FIG.

  As shown in FIGS. 4A and 4B, the valve body 18 is a plate-like body having an elliptical shape in front view, and is obtained by covering the entire metal valve body 72 with an elastic member 74. The valve body 72 is configured as a joined body in which the first plate 76 and the second plate 78 are joined so as to form an attachment hole 80 for assembling the shaft 20 at the center of the opposing surfaces. The first plate 76 and the second plate 78 have the same structure, and the valve main body 72 is formed by caulking and joining them. The shaft 20 has a stepped columnar shape as a whole, but a so-called D-cut is applied to a portion inserted through the valve body 18. That is, a pair of flat surfaces are formed in a portion of the shaft 20 that is inserted into the mounting hole 80, and they constitute a rotational force transmission surface 82 for transmitting the rotational force of the actuator 14.

  On the inner wall surface of the valve body 72 in which the mounting hole 80 is formed, a pair of pressure receiving surfaces 84 that are in contact with the pair of rotational force transmission surfaces 82 are formed. When the shaft 20 is rotationally driven by driving the actuator 14, the rotational force transmitting surface 82 presses the pressure receiving surface 84 to apply rotational torque. The valve body 18 rotates in a direction corresponding to the rotation direction of the actuator 14 to realize switching of the refrigerant passage 16.

  As shown in FIGS. 5A and 5B, the plates 76 and 78 have an elliptical main body 86, and the mounting hole forming portion 88 is bent into a concave shape along the short axis L <b> 1 of the main body 86. Have On the long axis L2 of the main body 86, a circular boss-like convex part 90 and a circular hole part 92 are provided at positions symmetrical to the short axis L1. A pressure receiving surface 84 is formed on the inner surface of the attachment hole forming portion 88 in parallel with the joint surface 94 extending to the main body 86.

  In the manufacturing process of the valve body 18, as shown in FIG. 5C, the first plate 76 and the second plate 78 are assembled with the joint surfaces 94 facing each other. At this time, one convex portion 90 of the first plate 76 and the second plate 78 is inserted into the other hole portion 92, and the joint surfaces 94 are brought into contact with each other. And as shown in FIG.5 (D), the front-end | tip of the predetermined tool W is abutted on the front-end | tip opening part of the convex part 90 of both plates, and it crimps. In this way, as shown in FIG. 5E, the valve body 72 in which the first plate 76 and the second plate 78 are joined is formed. That is, the first plate 76 and the second plate 78 are assembled by fitting the convex portion 90 provided on one opposing surface into the hole 92 provided on the other opposing surface. Are joined by caulking. At this time, the mounting hole 80 is formed so as to be surrounded by the mounting hole forming portions 88 of both plates.

  Subsequently, as shown in FIGS. 6A and 6B, an elastic member 74 (resin material having corrosion resistance) is baked on the valve main body 72. In the present embodiment, rubber is employed as the elastic member 74, and the rubber and the valve body 72 are vulcanized and joined. Thereby, the elastic member 74 is stably fixed to the valve main body 72 in a close contact state. An upper end surface and a lower end surface of the elastic member 74 are flat surfaces 98 that are parallel to each other, and an annular bead 100 projects from the flat surfaces 98 so as to surround the periphery of the opening end of the mounting hole 80. ing.

As shown in FIG. 6D, the bead 100 has a hemispherical shape (a semicircular cross section). When the valve body 18 is assembled to the body 12, as shown in FIG. 6E, the bead 100 is in close contact with the flat surface 71 of the body 12 in an annular shape . Bicycloalkyl over de 100 while surrounding the periphery of the open end of the insertion hole 36, into close contact with the inner surface of the refrigerant passage 16 (flat surface 71). The same applies to the lower bead 100. That is, the lower bead 100 is in close contact with the inner surface (flat surface 71) of the refrigerant passage 16 while surrounding the periphery of the opening end of the bearing hole 38 (see FIG. 2A). With such a configuration, the frictional resistance of the upper and lower surfaces of the valve body 18 can be suppressed and the operating torque of the valve body 18 can be suppressed when the valve is opened when neither the first flow path nor the second flow path is closed. it can.

  As described above, in the butterfly valve 10 of the present embodiment, the elastic member 74 is provided so as to cover the entire valve main body 72 (the first plate 76 and the second plate 78). A state of being in close contact with the main body 72 can be maintained. For this reason, even if the opening and closing operation of the valve portion is repeated in a state where the valve body 18 is exposed to the high-pressure refrigerant, the elastic member 74 is not easily lost. Further, the pressure resistance strength of the elastic member 74 can be increased by the valve body 72 functioning like a cored bar. As a result, the butterfly valve 10 can operate satisfactorily even in an environment where the refrigerant to be controlled has a high pressure.

  In addition, beads 100 are formed on the upper and lower end surfaces of the elastic member 74 constituting the valve body 18, respectively, and the bead 100 is compressed by local contact with the inner surface (flat surface 71) of the refrigerant passage 16. Realized. As a result, the sealing performance can be ensured, the area where the valve body 18 and the inner surface of the refrigerant passage 16 are in close contact with each other in the operating region of the valve body 18 can be reduced, and the operating torque of the butterfly valve 10 can be kept small. Moreover, since the sliding resistance of the valve body 18 can be suppressed to a small value, the valve body 18 can easily reliably close one flow path, and the valve closing performance of the butterfly valve 10 can be improved.

  Furthermore, by passing through the process of fitting one convex part 90 of the first plate 76 and the second plate 78 into the other hole part 92, both are positioned while being positioned autonomously, and the valve body 18 is simply assembled. Can be obtained. And the valve body 18 and the shaft 20 can be assembled | attached by the simple process of inserting the shaft 20 in the attachment hole 80 formed by the assembly | attachment. In particular, since the first plate 76 and the second plate 78 have the same structure, the cost can be reduced by sharing parts. Moreover, since the convex part 90 can be crimped in the flow of the assembly | attachment process of the 1st plate 76 and the 2nd plate 78, manufacturing efficiency can be improved rather than employ | adopting the joining method by welding etc.

  Further, according to the present embodiment, the oil is sealed in the gap space 64 between the valve body 18 and the shaft seal member 54, whereby the circulation of the refrigerant from the refrigerant passage 16 to the shaft seal member 54 side is restricted. For this reason, even if the shaft seal member 54 (O-rings 56 and 60) alone cannot prevent the refrigerant from leaking through the refrigerant, it becomes difficult for the refrigerant to reach the shaft seal member 54 itself due to the oil. That is, the double regulation by the oil and the shaft seal member 54 can enhance the sealing performance for preventing the refrigerant from leaking.

(Modification)
FIG. 7 is a partially enlarged cross-sectional view showing a configuration of a main part of a butterfly valve according to a modification of the first embodiment. In this modification, a plurality of (three in the illustrated example) recesses 170 are circumferentially provided on the outer peripheral surface of the portion located in the small diameter portion 44 of the shaft 120. Oil is sealed in a gap space 64 surrounded by the concave portion 170 and the small diameter portion 44. Even with such a configuration, the sealing performance can be enhanced as in the present embodiment.

  In the present embodiment, as shown in FIG. 4B, the shaft 20 is provided with a pair of flat surfaces parallel to the joint surface of the first plate 76 and the second plate 78, and these are provided with a rotational force. The transmission surface 82 is configured to contact the inner wall surface of each plate. That is, the configuration has been shown in which the inner wall surface of the mounting hole 80 through which the shaft 20 is inserted in the valve main body 72 has only a surface parallel to the joint surface of both plates as a pressure receiving surface that receives the rotational force from the shaft 20. In a modification, the inner wall surface of the mounting hole 80 may include a pressure receiving surface that is non-parallel to the joint surface of both plates. For example, a curved surface continuous with the pair of flat surfaces of the shaft 20 and the inner wall surface of the mounting hole 80 may be in contact with each other. With such a configuration, as in the fifth embodiment to be described later, the force generated by the rotational torque of the shaft 20 acts on the pressure receiving surface that is not parallel to the joint surface between the first plate 76 and the second plate 78. To come. Thereby, problems such as separation of the first plate 76 and the second plate 78 and deformation of the mounting hole 80 are less likely to occur.

  Further, in the present embodiment, as shown in FIG. 5 and the like, an example in which a plurality of plates (first plate 76 and second plate 78) are prepared and joined together to form the valve body 72 is shown. In a modification, the valve body 72 may be formed by integrally molding a metal material. That is, the valve main body 72 may be formed by metal material injection molding, forging, die casting, or the like. For example, metal powder injection molding (Metal Injectipn Molding: hereinafter also referred to as “MIM”) may be performed. MIM is a processing technique for molding and sintering an object by injection molding using metal powder as a material, and is a technique in which powder metallurgy and injection molding are fused. Specifically, a binder made of a resin is kneaded with metal powder, and injection molding is performed using the resulting compound. The injection molded product obtained at this time is degreased to remove the binder and then sintered to obtain a valve body 72. If necessary, post-processing such as cutting may be performed after sintering.

[Second Embodiment]
FIG. 8 is a partial enlarged cross-sectional view showing the configuration of the main part of the butterfly valve according to the second embodiment. FIG. 8A shows the configuration of the second embodiment, and FIG. 8B shows the configuration of a modification of the second embodiment. Below, it demonstrates centering on difference with 1st Embodiment. In the figure, the same components as those in the first embodiment are denoted by the same reference numerals.

  As shown in FIG. 8A, in the present embodiment, a recess 268 is provided around the inner peripheral surface of the small diameter portion 44 of the body 212. Oil is sealed in a gap space 64 surrounded by the recess 268 and the shaft 220. On the other hand, as shown in FIG. 8B, in the modified example, a plurality of steps (three steps in the illustrated example) of recesses 270 are provided around the inner peripheral surface of the small diameter portion 44. Oil is sealed in a gap space 64 surrounded by the recess 270 and the shaft 220. Even with such a configuration, the sealing performance can be enhanced as in the first embodiment.

[Third Embodiment]
FIG. 9 is a partial enlarged cross-sectional view showing the configuration of the main part of the butterfly valve according to the third embodiment. FIG. 9A shows the configuration of the third embodiment, and FIG. 9B shows the configuration of a modification of the third embodiment. Below, it demonstrates centering on difference with 2nd Embodiment. In the figure, the same components as those in the second embodiment are denoted by the same reference numerals.

  As shown in FIG. 9A, in this embodiment, the medium diameter portion 42 is extended and the small diameter portion 44 is made small in the insertion hole 336 of the body 312. A cylindrical intermediate member 368 is disposed below the middle diameter portion 42. A recess 268 is provided around the inner peripheral surface of the intermediate member 368. Oil is sealed in a gap space 64 surrounded by the recess 268 and the shaft 220. On the other hand, as shown in FIG. 9B, in the modification, a plurality of steps (three steps in the illustrated example) of recesses 270 are provided around the inner peripheral surface of the intermediate member 370. Oil is sealed in a gap space 64 surrounded by the recess 270 and the shaft 220. Even with such a configuration, the sealing performance can be enhanced as in the second embodiment. The intermediate member 368 may be made of a fluorine resin such as polytetrafluoroethylene (PTFE). Or what consists of metal materials, such as a sintered metal, may be sufficient. In any case, a corrosion-resistant material having excellent corrosion resistance against the refrigerant is preferable.

[Fourth Embodiment]
FIG. 10 is a partially enlarged cross-sectional view showing the configuration of the main part of the butterfly valve according to the fourth embodiment. FIG. 10A shows the configuration of the fourth embodiment, and FIG. 10B shows the configuration of a modification of the fourth embodiment. Below, it demonstrates centering on difference with 3rd Embodiment. In the figure, the same components as those in the third embodiment are denoted by the same reference numerals.

  As shown in FIG. 10A, in the present embodiment, a cylindrical intermediate member 468 is disposed below the middle diameter portion 42. A recess 268 is provided around the inner peripheral surface of the intermediate member 468, and a recess 467 is provided around the outer peripheral surface. Then, oil is sealed in a gap space 64 surrounded by the recess 268 and the shaft 220 and a gap space 464 surrounded by the recess 467 and the medium diameter portion 42. On the other hand, as shown in FIG. 10B, in the modification, a plurality of steps (three steps in the illustrated example) of the recesses 270 are provided on the inner peripheral surface of the intermediate member 470, and a plurality of steps (not shown) are also provided on the outer peripheral surface. In this example, three stages of recesses 469 are provided. Then, oil is sealed in a gap space 64 surrounded by the recess 270 and the shaft 220 and a gap space 464 surrounded by the recess 469 and the medium diameter portion 42. Even with such a configuration, the sealing performance can be enhanced as in the second embodiment.

[Fifth Embodiment]
FIG. 11 is a diagram illustrating a configuration of a main part of the butterfly valve according to the fifth embodiment. FIG. 11A shows a main part of the assembly structure of the valve body and the shaft. FIG. 11B is a cross-sectional view taken along the line JJ in FIG. In the drawing, the illustration of the elastic member is omitted for convenience of explanation. Below, it demonstrates centering on difference with 1st Embodiment. In the figure, components that are substantially the same as those in the first embodiment are denoted by the same reference numerals.

  As shown in FIGS. 11A and 11B, in this embodiment, the mounting hole 580 formed by joining the first plate 576 and the second plate 578 is configured to have a rhombus shape. That is, the inner wall surface forming the attachment hole 580 in the main body 586 of each plate is a pressure receiving surface 596 that is non-parallel to the joint surface 94 of both plates. In the illustrated example, two pressure receiving surfaces 596 that are perpendicular to each other are formed on each of the first plate 576 and the second plate 578. The angle formed between each pressure receiving surface 596 and the joint surface 94 is set to 45 degrees. A mounting hole 580 is formed by these four pressure receiving surfaces 596. A portion of the shaft 520 that is inserted into the mounting hole 580 is configured to be complementary to the mounting hole 580. In other words, the cross section of the insertion portion has a generally rhombus shape, and the four rotational force transmission surfaces 582 of the insertion portion abut against the four pressure receiving surfaces 596, respectively. With such a configuration, the resistance of the valve body 572 to the rotational torque of the shaft 520 can be increased. This effect will be described later.

(Modification)
FIG. 12 is a diagram illustrating a configuration of a main part of a butterfly valve according to a modification of the fifth embodiment. FIG. 12A shows the main part of the assembly structure of the valve body and the shaft. FIG. 12B is a cross-sectional view taken along line JJ in FIG.

  As shown in FIGS. 12A and 12B, in this modification, the attachment hole 680 formed by joining the first plate 676 and the second plate 678 is rectangular (or square). It is configured. That is, the inner wall surface forming the attachment hole 680 in the main body 686 of each plate includes a pressure receiving surface 696 that is parallel to the joint surface 94 of both plates and a pair of pressure receiving surfaces 698 that are non-parallel. The pressure receiving surface 696 and the pressure receiving surface 698 are perpendicular to each other. A mounting hole 680 is formed by these pressure receiving surfaces 696 and 698. A portion of the shaft 620 that is inserted into the mounting hole 680 is configured to be complementary to the mounting hole 680. That is, the cross section of the insertion portion is rectangular (or square), and the four rotational force transmission surfaces 682 of the insertion portion abut against the pressure receiving surfaces 696 and 698, respectively. With such a configuration, the resistance of the valve body 672 to the rotational torque of the shaft 620 can be increased. This effect will be described later.

  FIG. 13 is a diagram illustrating the operational effects of the fifth embodiment and its modifications. FIG. 13A shows the configuration of the first embodiment as a comparative example, FIG. 13B shows the configuration of the fifth embodiment, and FIG. 13C shows the configuration of the modification.

  As shown in FIG. 13A, in the configuration of the first embodiment, a pair of pressure receiving surfaces 96 in which the force due to the rotational torque of the shaft 20 is parallel to the joint surface 94 between the first plate 76 and the second plate 78. Only affects (see bold arrows). For this reason, as shown in the drawing, the force in the direction of separating the first plate 76 and the second plate 78 increases. As a result, depending on the magnitude of the rotational torque, the first plate 76 and the second plate 78 may be separated from each other and the mounting hole 580 may be deformed, so that the driving force of the actuator is not transmitted to the valve body and functions as a butterfly valve. There is a possibility that it will not be possible.

  On the other hand, as shown in FIG. 13B, in the configuration of the fifth embodiment, the force due to the rotational torque of the shaft 520 is not parallel to the joint surface 94 between the first plate 576 and the second plate 578. The four pressure receiving surfaces 596 act in a distributed manner (see thick arrows). In addition, the component of the force is dispersed in a direction in which the first plate 576 and the second plate 578 are separated from each other (see the dotted line arrow) and in a direction parallel to the joining surface 94 (see the two-dot chain line arrow). For this reason, it is difficult to cause problems such as separation of the first plate 576 and the second plate 578 and deformation of the mounting hole 580. Further, since the convex portion 90 receives the force in the direction parallel to the joint surface 94, the joint surface 94 is not sheared. As a result, the assembled state of the valve body and the shaft can be secured, and the rotational force transmission function by the shaft can be maintained.

  Further, as shown in FIG. 13C, in the configuration of the modified example, the force due to the rotational torque of the shaft 620 causes a pressure receiving surface 696 that is parallel to the joining surface 94 of the first plate 676 and the second plate 678, It acts in a distributed manner on the pressure receiving surface 698 that is non-parallel to the joint surface 94 (see thick arrow). For this reason, it is difficult to cause problems such as separation of the first plate 676 and the second plate 678 and deformation of the mounting hole 680. Further, since the convex portion 90 receives the force in the direction parallel to the joint surface 94, the joint surface 94 is not sheared. As a result, the assembled state of the valve body and the shaft can be secured, and the rotational force transmission function by the shaft can be maintained.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments, and various modifications can be made within the scope of the technical idea of the present invention. Nor.

  In the said embodiment, as shown to FIG. 1 (A), the example which made the opening edge part 28 to the 1st channel | path 24 of the 2nd channel | path 26 into an ellipse cross section was shown. In the modified example, other shapes may be adopted as the cross-sectional shape of the opening end portion 28. FIG. 14 is a front view illustrating a configuration of a butterfly valve according to a modification.

  For example, as shown in FIG. 14A, a rectangular opening end 728 having a vertically long cross-sectional shape may be used. Alternatively, as shown in FIG. 14B, an opening end portion 828 having an oval shape different from that of the first embodiment may be used. Or it is good also as other vertically long polygonal shapes, such as a barrel shape and an ellipse shape.

  In the above embodiment, as shown in FIG. 4, the valve body 18 (the first plate 76 and the second plate 78) is entirely covered with the elastic member 74 to configure the valve body 18. In the modification, the valve body may be configured such that at least the outer peripheral portion thereof is covered with an elastic member, although not the entire valve body (plate).

  In the above embodiment, the body 12 is made of metal. In a modification, the body 12 may be made of other materials such as resin.

  In the said embodiment, as shown in FIG. 5, the example which crimp-joins the 1st plate 76 and the 2nd plate 78 was shown. In a modification, you may join by other methods, such as screw joining. That is, the convex portion 90 may be replaced with a male screw separate from the main body 86, and the hole portion 92 may be replaced with a female screw formed in the main body 86.

  Although not described in the third and fourth embodiments, the intermediate member may be composed of an oil-containing member obtained by impregnating a porous material with oil. In that case, it is good also as a structure which does not form a recessed part in the internal peripheral surface or outer peripheral surface of an intermediate member. Further, the intermediate member may function as an oil-impregnated bearing to support the shaft.

  In the above embodiment, oil is sealed in the gap space 64, but grease or other lubricants may be sealed. Such lubricants such as oil and grease may be made of a material compatible with the refrigerant. As a result, even if the lubricant leaks into the refrigerant passage, the lubricant can be prevented from being damaged, for example, by changing the quality of the refrigerant. Even if a lubricant compatible with the refrigerant is selected in this way, at least the ratio of the refrigerant guided to the shaft seal member 54 can be reduced, and the refrigerant can be prevented from passing through the shaft seal member 54 and leaking outside. Or conversely, the lubricant may be made of a material incompatible with the refrigerant. Thereby, the lubricant functions like a shielding wall in the gap space 64, and the refrigerant can be effectively suppressed from being guided to the shaft seal member 54. Whether such a lubricant is compatible or incompatible with the refrigerant can be appropriately selected depending on the use of the butterfly valve. The resin material is enclosed in the gap space 64, but may be filled between the members constituting the shaft seal member 54. That is, the lubricant may be filled in the space around the O-rings 56 and 58. With such a configuration, even if the refrigerant passes through the O-rings 56 and 58, it is possible to prevent or suppress the refrigerant from leaking to the actuator 14 side beyond the shaft seal member 54 due to the lubricant filled in the space.

  In the above embodiment, the O-rings 56 and 60 having a circular cross section are exemplified as the seal ring constituting the shaft seal member 54. In a modified example, other seal rings such as an X ring having an X cross section, a V ring having a V cross section (V packing), and a T ring having a T cross section may be employed instead of the O ring. Thereby, the filling amount of oil, grease, etc. can be increased as compared with the case where an O-ring is employed.

  In the said embodiment, the example which comprises a butterfly valve as a three-way valve which can switch a refrigerant path was shown. In a modified example, the butterfly valve may be configured as a four-way valve or a two-way valve. For example, when a two-way valve is used, the refrigerant passage may be configured as an open / close valve capable of opening and closing. Or you may comprise as a control valve which can adjust the open / close state and opening degree of a refrigerant path.

  In the said embodiment, the example which applies a butterfly valve to the refrigerating cycle of a vehicle air conditioner was shown. In a modification, you may apply to the refrigerating cycle of other air conditioners, such as home use. Or you may apply to water circuits, such as a hot-water supply apparatus. Furthermore, the present invention may be applied to a device that controls the flow of oil or other working fluid.

  In addition, this invention is not limited to the said embodiment and modification, A component can be deform | transformed and embodied in the range which does not deviate from a summary. Various inventions may be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments and modifications. Moreover, you may delete some components from all the components shown by the said embodiment and modification.

  10 butterfly valve, 12 body, 14 actuator, 16 refrigerant passage, 18 valve body, 20 shaft, 22 rotating mechanism, 24 first passage, 26 second passage, 28 open end, 30 introduction port, 32 first derivation port, 33 working chamber, 34 second outlet port, 35 partition, 36 insertion hole, 38 bearing hole, 54 shaft seal member, 56 O ring, 58 backup ring, 60 O ring, 62 backup ring, 64 gap space, 68 recess, 71 Flat surface, 72 Valve body, 74 Elastic member, 76 First plate, 78 Second plate, 80 Mounting hole, 82 Rotational force transmission surface, 84 Pressure receiving surface, 90 Convex portion, 92 Hole portion, 94 Joint surface, 98 Flat surface , 100 bead, 120 shaft, 1 0 recess, 220 shaft, 268, 270 recess, 336 insertion hole, 368, 370 intermediate member, 464 gap space, 467 recess, 468 intermediate member, 469 recess, 470 intermediate member, 520 shaft, 572 valve body, 576 first plate , 578 Second plate, 580 Mounting hole, 582 Rotational force transmission surface, 596 Pressure receiving surface, 620 Shaft, 672 Valve body, 676 First plate, 678 Second plate, 680 Mounting hole, 682 Rotational force transmission surface, 696, 698 Pressure-receiving surface, 728, 828 Open end.

Claims (2)

In the electric butterfly valve
A body having a passage for allowing fluid to pass through;
A shaft supported by the body so as to be rotatable about its own axis and extending in a radial direction of the passage;
A valve body that is disposed in the passage in a state assembled to the shaft, and that can adjust an opening / closing state or an opening degree of the passage by rotating together with the shaft;
An actuator for rotating the shaft by energization;
With
The passage includes a first passage and a second passage connected to intersect the first passage,
The valve body is disposed at a connection portion between the first passage and the second passage, and the communication state between the first passage and the second passage can be adjusted by rotating the valve body.
The open end of the the first passage of the second passage, have a cross-sectional opening width is less perpendicularly of the axis direction of the shaft,
A butterfly valve which is installed in a refrigeration cycle of an air conditioner and functions as a control valve for controlling the flow of refrigerant . The valve body is obtained by covering at least the outer periphery of a metal plate with an elastic member,
The outer peripheral portion of the elastic member abuts along the inner peripheral surface of the first passage, thereby realizing a seal at a portion where the valve body blocks the communication state between the first passage and the second passage. The butterfly valve according to claim 1.

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