JP7340378B2 - Valve body drive device - Google Patents

Description

The present invention relates to a valve element drive device that includes a valve element that opens and closes a flow path for fluid such as refrigerant gas.

This type of valve body driving device is described in Patent Document 1 and Patent Document 2. The valve body driving devices described in these documents include a valve body that opens and closes a flow path for refrigerant gas, a valve body that includes a rotor that drives the valve body, and a stator that drives the rotor. . Furthermore, a power transmission switching unit is provided for switching between a power transmission state in which power is transmitted to the valve body and a power non-transmission state in which the power is not transmitted to the valve body when the valve body opens and closes the flow path. There is.

Japanese Patent Application Publication No. 2001-271956 Japanese Patent Application Publication No. 2006-10004

The valve body driving devices described in Patent Document 1 and Patent Document 2 have a structure in which a needle valve, which is a valve body, is moved in the axial direction of a rotor to open and close a flow path. Some valve body drive devices of this type have a sliding type structure in which the valve body is brought into contact with a flat valve seat surface having a fluid outlet and rotated around an axis to open and close the outlet.
However, the flow path opening/closing structure of the valve body driving device described in Patent Document 1 and Patent Document 2 cannot accommodate such a sliding type valve body. Further, Patent Document 1 and Patent Document 2 neither describe nor suggest the valve body drive device having the sliding type structure.

An object of the present invention is to open and close a flow passage with a simple structure and with high precision even in a valve body drive device that opens and closes a flow passage by rotating the valve body around the axis of the rotor without moving it in the direction along the axis of the rotor. The goal is to make it possible.

In order to achieve the above object, a valve body driving device according to the present invention includes a valve body that rotates to open and close a flow path, a valve body that includes a rotor that rotates the valve body, and a stator that rotates the rotor. , a power transmission switching unit that switches between a power transmission state in which the rotational force of the rotor is transmitted to the valve body and a power non-transmission state in which the rotational force of the rotor is not transmitted to the valve body, the power transmission switching unit a coil spring disposed in a power transmission path between the rotor and the valve body and attached to apply a tightening force to an attached portion of the rotor; and a coil spring that prevents the coil spring from rotating integrally with the rotor. a rotation regulating section, the power transmission state is created when the coil spring rotates integrally with the rotor due to friction caused by the tightening force, and the power non-transmission state is created when the coil spring rotates integrally with the rotor. The rotation of the rotor is restricted by the rotation regulating portion at a predetermined rotational position, and the coil spring is made by slipping against the attached portion of the rotating rotor.

According to the valve body driving device according to the present invention, a coil spring is disposed in a power transmission path between the rotor and the valve body, and the coil spring is attached in a state to apply a tightening force to an attached portion of the rotor. .
The power transmission state of the power transmission switching section is created by the coil spring rotating together with the rotor due to friction caused by the tightening force. Further, the power transmission state of the power transmission switching unit is such that the rotation of the coil spring in unison with the rotor is restricted by the rotation restriction unit at a predetermined rotational position, and the coil spring rotates when the rotor is connected to the attached member. It is made by slipping against the part.
As a result, in a valve body drive device that opens and closes a flow path by rotating a valve body around an axis with a rotor, the power transmission state and the power non-operation state by the power transmission switching unit for opening and closing the flow passage of the valve body are changed. Switching of the transmission state can be realized by the tightening force and the slip of the coil spring. Therefore, even in a valve body drive device having a structure in which the flow passage is opened and closed by rotating the valve body around the axis of the rotor without moving it in a direction along the axis of the rotor, opening and closing of the flow passage can be performed using a simple structure using a coil spring. It can be done with high precision.
Further, in this type of valve body driving device, the predetermined rotational position at which the power is not transmitted usually corresponds to a state in which the valve body is returned to the original position for opening and closing the flow path. It is. That is, even if the rotor continues to rotate with the valve body returned to the original position, no power is transmitted to the valve body, which is stopped at the original position due to the slip of the coil spring. Therefore, by simply rotating the valve body toward the home position, the valve body will stop even if the rotor is rotating when it reaches the home position, so that the valve body can be easily and accurately moved to the home position. It can be returned well. Further, even if the rotor continues to rotate, the coil spring is in the slip state, so it is possible to reduce the possibility of noise and vibration occurring.

Further, in the above-mentioned valve body driving device, the valve body includes a sealing cover that partitions the inside and the outside, and a base portion that is joined to the sealing cover and forming a valve chamber, and the valve body It is preferable that the valve seat slide and rotate in contact with the valve seat surface of the valve seat.

According to the above configuration, in the valve body driving device having a structure in which the valve body slides and rotates while contacting the valve seat surface, switching between the power transmission state and the power non-transmission state is performed by the tightening force of the coil spring. This can be realized by the slip mentioned above. Thereby, the flow path can be opened and closed with high precision using a simple structure using a coil spring.

Further, in the valve body driving device, it is preferable that the valve body opens and closes the outlet of the flow path by the slide rotation.

Generally, there are many structures in which the valve body opens and closes the outlet of the flow path by the slide rotation, and the effects described above can be easily obtained for such structures.

Further, in the valve body driving device, it is preferable that one end of the coil spring is locked to the valve body side member and the other end is a free end.
Here, the term "valve body side member" includes both the structure of the valve body alone and the assembled structure of the valve body and other members that rotate together.

According to the above configuration, since one end of the coil spring is locked to the valve body side member, the slip state of the coil spring can be easily achieved by regulating the rotation of the valve body side member with the rotation regulating portion. can do.
Furthermore, since the other end of the coil spring is a free end, the coil spring can remain in the slip state even if the rotor continues to rotate.

Further, in the valve body driving device, the valve body side member includes the valve body and a guide member that rotates together with the valve body, and one end of the coil spring is locked to the guide member. It is preferable.

According to the above configuration, one end of the coil spring is locked to the guide member, and the rotational force of the rotor is transmitted to the valve body via the guide member. Thereby, even in a structure where it is difficult or undesirable to directly lock one end of the coil spring to the valve body, it can be easily accommodated.

Further, in the valve body driving device, the valve body side member may include an abutted portion, and the rotation regulating portion may restrict rotation of the valve body and the coil spring by coming into contact with the abutted portion. preferable.

According to the above configuration, the rotation regulating portion regulates the rotation of the valve body and the coil spring by contacting the abutted portion of the valve body side member. That is, the rotation of the valve body can be reliably stopped at a predetermined rotational position by the abutted portion. Thereby, by setting the origin position of the valve body to a position where the abutted portion abuts the rotation regulating portion, the valve body can be accurately returned to the origin position.

Further, in the valve body driving device, it is preferable that the coil spring includes a coil-side friction portion, at least a portion of which comes into contact with the rotor, having a friction force different from a friction force of an outer surface of the coil spring.
Here, the "frictional force" of the coil-side friction portion means the frictional force generated between it and the rotor.

According to the above configuration, the coil spring includes a coil-side friction portion having a friction force different from a friction force on the outer surface of the coil spring. This makes it possible to design and manufacture the coil spring by combining the frictional force of the coil-side friction portion and the tightening force of the coil spring, resulting in the effect that it becomes easier to manufacture a coil spring with the required characteristics. . Furthermore, even if it is difficult to create a coil spring with the required characteristics using the friction force based on the material of the coil spring itself, it can be easily achieved by selecting the coil-side friction part to have the appropriate friction force. can do.

Further, in the valve body driving device, it is preferable that the attached portion of the rotor includes a rotor-side friction portion having a friction force different from a friction force on an outer surface of the attached portion.

According to the above configuration, the attached part of the rotor includes a rotor-side friction part having a friction force different from the friction force of the outer surface of the attached part, so that the attached part has a structure similar to that of the coil-side friction part. The effect can be obtained by the rotor-side friction section.

Further, in the valve body driving device, the friction force of the coil-side friction part or the rotor-side friction part is larger than the friction force of the outer surface of the coil spring or the attached part on which the friction part is provided. is preferred.

According to the above configuration, the friction force of the coil side friction part or the rotor side friction part is larger than the friction force of the outer surface of the coil spring or the attached part on which the friction part is provided. Thereby, even if the tightening force of the coil spring is reduced, the frictional force necessary for switching between the power transmission state and the power non-transmission state can be obtained, and durability can be improved.

Further, in the valve body driving device, it is preferable that the coil-side friction portion or the rotor-side friction portion is configured with a rough surface obtained by roughening the surface of the coil spring or the surface of the attached portion. .

According to the above configuration, the coil-side friction portion or the rotor-side friction portion can be easily formed without increasing the number of parts.

Further, in the valve body driving device, it is preferable that the valve body side member is disposed on a shaft around which the rotor rotates.

According to the above configuration, it is possible to easily correspond to a valve body drive device having a direct-acting structure that directly transmits the rotation of the rotor to the valve body side member.

According to the present invention, even in a valve body drive device that opens and closes a flow passage by rotating the valve body around the axis of the rotor without moving it in the direction along the axis of the rotor, the flow passage can be opened and closed with a simple structure and with high accuracy. can be done.

1 is an external perspective view of main parts of a valve body driving device according to Embodiment 1 of the present invention. FIG. FIG. 2 is an external perspective view of the main parts of the valve body driving device of FIG. 1 viewed from a different direction. FIG. 2 is an external perspective view of the valve body from FIG. 1 with the stator removed. FIG. 4 is an external perspective view of the main part of the valve body from FIG. 3 with the sealing cover omitted. FIG. 5 is an external perspective view of the main part from FIG. 4 with magnets around the rotor omitted. FIG. 6 is an external perspective view from FIG. 5 in which the base portion and flow path pipe of the valve body are omitted. FIG. 7 is an external perspective view of the main parts of the valve body drive device of FIG. 6 viewed from a different direction. FIG. 7 is a front view of the valve body drive device of FIG. 6 viewed from the free end side of the coil spring. FIG. 7 is an external perspective view of a coil spring according to Embodiment 2 of the present invention. FIG. 7 is an external perspective view of an attached part according to Embodiment 2 of the present invention. FIG. 7 is an external perspective view showing a modified example of the coil spring according to the second embodiment.

Hereinafter, a valve body driving device according to the present invention will be described in detail based on the embodiments shown in FIGS. 1 to 8.
In the following description, three mutually orthogonal axes are referred to as the X axis, Y axis, and Z axis, respectively, as shown in FIG. 1. Here, the upper side of FIG. 1 corresponds to the direction along the Z axis. The X-axis and Y-axis are specified insofar as they are orthogonal to the Z-axis.

[Embodiment 1]
<Description of the schematic structure of the valve body drive device>
As shown in FIGS. 1 to 4, the valve body drive device 1 according to the first embodiment has a valve body 7 (see FIG. 3) and a stator 9 disposed around the rotor 5 to rotate the rotor 5 around the shaft 2. Although the valve body drive device 1 includes a housing that covers the valve body 7 and the stator 9 and separates them from the outside, illustration of this housing is omitted.
As shown in FIGS. 5 to 8, the valve body 7 includes a valve body 4 (FIG. 6) that opens and closes the flow path by rotating. is configured to rotate.
A power transmission switching unit 6 is provided for switching between a power transmission state in which the rotational force of the rotor 5 is transmitted to the valve body 4 and a power non-transmission state in which the rotational force of the rotor 5 is not transmitted to the valve body 4.

In this embodiment, there are three flow pipes 3, one of which is a refrigerant inflow pipe 3i, and the other two are refrigerant outflow pipes 3o. The refrigerant flows into a valve chamber in the valve body 9, which will be described later, through the inflow pipe 3i, and is sent from the valve chamber to an external cooling area through the outflow pipe 3o. Of course, the number of channel pipes 3 is not limited to three, and depending on the application, there may be two, four or more.

As shown in FIG. 3, the valve body 7 includes a sealing cover 11 that partitions the inside and the outside, and a base portion 15 that is joined to the sealing cover 11 to form the valve chamber 13. In this embodiment, the base portion 15 is a bottomed cup with a concave curved surface, and a valve seat component 21 is assembled to the bottom portion. As shown in FIG. 4, the rotor 5 is arranged inside the airtight cover 11. In FIG. 4, reference numeral 17 indicates a magnet that constitutes a part of the rotor 5, and the magnet 17 has a cylindrical shape in this embodiment.
As shown in FIG. 6, the valve body 4 is configured to slide and rotate while in contact with the valve seat surface 19 of the base portion 15. As shown in FIG. Specifically, the upper surface of the valve seat component 21 located at the bottom of the base portion 15 is a valve seat surface 19, and the valve body 4 rotates around the shaft 2 while in contact with the valve seat surface 19. is configured to do so.

As shown in FIGS. 2 and 7, one ends of the two outflow pipes 3o are connected to the valve seat component 21. In FIG. 7, reference numerals 23 indicate circular holes to which the outflow pipes 3o are connected, and these circular holes 23 are opened and connected to the valve seat surface 19 through small-diameter holes (not shown) at the back thereof. In FIG. 6, the small-diameter hole is opened in a portion of the valve seat surface 19 that is in contact with and covered by the sliding surface of the lower surface of the valve body 4.
The valve body 4 opens and closes the small diameter hole by rotating around the shaft 2, and adjusts and changes the outflow of the refrigerant in the valve chamber 13 to each outflow pipe 3o. That is, the valve body 4 opens and closes the outlet of the flow path by the slide rotation.

<Power transmission switching section>
In this embodiment, the power transmission switching unit 6 includes a coil spring 27 that is disposed in the power transmission path between the rotor 5 and the valve body 4 and is attached to apply a tightening force to the attached portion 25 of the rotor 5; A rotation regulating portion 29 that regulates rotation together with the rotor 5 is provided. The power transmission state is created by the coil spring 27 rotating together with the rotor 5 due to the friction caused by the tightening force, and the power non-transmission state is created by a predetermined state in which the coil spring 27 rotates together with the rotor 5. The coil spring 27 is regulated by the rotation regulating portion 29 at the rotational position of the rotor 5 and is created by slipping against the attached portion 25 of the rotating rotor 5.
When the rotation of the coil spring 27 is restricted and stopped due to the slip, the rotation of the valve body 4 is also restricted and stopped in conjunction therewith.
Here, the predetermined rotational position at which the rotation of the coil spring 27 is restricted by the rotation restriction portion 29 corresponds to the original position to which the valve body 4 is returned during the channel opening/closing operation.

<Rotor>
As shown in FIGS. 5 and 6, the rotor 5 includes a cylindrical large diameter portion 31 that joins with the inner surface of the magnet 17 to fix the magnet, and a cylindrical small diameter portion that is smaller in diameter than the large diameter portion 31. It is equipped with The small diameter portion is the attached portion 25 to which the coil spring 27 is attached with the tightening force applied. As can be understood from the figure, the large diameter portion 31 and the attached portion 25 (small diameter portion) use the shaft 2 as a common axis.
The lower surface of the attached portion (small diameter portion) 25 is a circular flat surface 20 (see FIG. 10), and the lower end side of the shaft 2 protrudes from the flat surface 20. The valve body 4 is arranged between the flat surface 20 of the attached portion 25 and the valve seat surface 19 of the valve seat component 21 so as to be rotatable around the shaft 2 .
As shown in FIG. 4, when the magnet 17 is joined to the large diameter portion 31, the attached portion 25, which is the small diameter portion, and the coil spring 27 attached to the attached portion 25 are moved by the magnet 17. It will be covered from the outside.

<Coil spring>
As shown in FIGS. 5 to 8, the coil spring 27 is attached to the attached portion 25 of the rotor 5 in such a manner that it applies a tightening force. Specifically, the coil diameter of the coil spring 27 is smaller than the outer diameter of the attached portion 25.
Due to this diameter difference, when the coil spring 27 is attached to the attached portion 25, the coil diameter of the coil spring 27 is elastically expanded, and the tightening force is generated as a repulsive force of the elastic expansion.

One end 33 of the coil spring 27 is locked to the valve body side member 35, and the other end 37 is a free end. That is, as shown in FIG. 8, the other end 37 is not locked to any other member and simply contacts the outer surface of the attached portion 25 in a free state by the tightening force.
In this embodiment, the valve body side member 35 includes a valve body 4 and a guide member 8 that rotates together with the valve body 4. The valve body 4 and the guide member 8 have a convex portion 10 protruding from the guide member 8 that fits into a hole 12 (FIG. 6) of the valve body 4, so that both the valve body 4 and the guide member 8 are rotated around the shaft 2. are configured to rotate together.
One end 33 of the coil spring 27 is locked in the groove 14 of the guide member 8. That is, the rotation of the rotor 5 is transmitted to the coil spring 27, from one end 33 of the coil spring 27 to the guide member 8, and further from the guide member 8 to the valve body 4.
Incidentally, the valve body side member 35 may be composed of only the valve body 4 without the guide member 8. In this case, a portion corresponding to the groove 14 is provided in the valve body 4, and one end 33 of the coil spring 27 is locked to a portion of the valve body 4 corresponding to the groove 14.

<Rotation regulation part>
The rotation restriction portion 29 restricts the coil spring 27 from rotating together with the rotor 5 .
A ring-shaped ring plate 39 is sandwiched and fixed between the airtight cover 11 and the base portion 15. The ring plate 39 is arranged around the guide member 8 at a position corresponding to the guide member 8. The rotation restricting portion 29 is provided on the inner peripheral edge of the ring plate 39 and protrudes inward, that is, toward the guide member 8 .
As shown in FIGS. 6 and 7, the guide member 8 has a contact portion 16 protruding from its outer surface. Specifically, the abutted portion 16 constitutes a part of the groove 14 of the guide member 8 and is provided adjacent to the groove 14 .
Further, the abutted portion 16 is arranged at a position corresponding to the rotation regulating portion 29 provided on the ring plate 39. That is, when the guide member 8 rotates around the shaft 2 and reaches a predetermined rotational position, the rotation regulating portion 29 comes into contact with the abutted portion 16, thereby regulating the rotation of the guide member 8. ing.
In other words, the guide member 8 is rotated by the rotational force transmitted from the coil spring 27, so that the rotation regulating portion 29 restricts the rotation of the coil spring 27 together with the rotor 5 at a predetermined rotational position. is in a state where it slips with respect to the attached portion 25 of the rotating rotor 5.

<Description of the effects of Embodiment 1>
(1) According to the present embodiment, the coil spring 27 is arranged in the power transmission path between the rotor 5 and the valve body 4, and the coil spring 27 is attached to the attached portion 25 of the rotor 5 in a state that applies a tightening force. There is.
The power transmission state of the power transmission switching unit 6 is created by the coil spring 27 rotating together with the rotor 5 due to the friction caused by the tightening force. In addition, when the power transmission switching unit 6 is in the non-power transmission state, the coil spring 27 is restricted from rotating integrally with the rotor 5 by the rotation restriction unit 29 at a predetermined rotational position, and the coil spring 27 is in a state where the rotor 5 is attached to the rotating body. It is made by slipping against the section 25.
Therefore, in the valve body driving device 1 having a structure in which the flow passage is opened and closed by rotating the valve body 4 around the axis by the rotor 5, the power transmission state by the power transmission switching unit 6 for the flow passage opening and closing operation of the valve body 4 is The switching between the state and the power non-transmission state can be realized by the tightening force and the slip of the coil spring 27. As a result, even in the valve body drive device 1 which has a structure in which the flow passage is opened and closed by rotating the valve body 4 around the shaft 2 without moving it in the direction along the axis 2 of the rotor 5, the opening and closing of the flow passage is controlled by the coil spring. This can be done with high accuracy using the simple structure of No. 27.
(2) Further, in this type of valve body driving device, the predetermined rotational position at which the power is not transmitted corresponds to a state in which the valve body 4 is returned to the original position for the flow path opening/closing operation. This is a normal case, and this embodiment also has a similar origin position. That is, even if the rotor 5 continues to rotate with the valve body 4 returned to the original position, no power is transmitted to the valve body 4 which is stopped at the original position due to the slip of the coil spring 27. Therefore, by simply rotating the valve body 4 toward the home position, the valve body 4 will stop even if the rotor 5 is rotating when it reaches the home position, so that the valve body 4 can be moved to the home position. It can be returned easily and accurately. Moreover, even if the rotor 5 continues to rotate, the coil spring 27 is in the slip state, so that the possibility of noise and vibration occurring can be reduced.

(3) Also, in a valve body drive device in which the valve body 4 slides and rotates in contact with the valve seat surface 19, the switching between the power transmission state and the power non-transmission state is performed by the tightening force of the coil spring 27. Since this can be realized by the slip, the flow path can be opened and closed with high precision using a simple structure using the coil spring 27.

(4) If the coil spring 27 has a structure in which one end 33 is locked to the valve body side member 35, the rotation of the valve body side member 35 is restricted by the rotation regulating portion 29, thereby causing the coil spring 27 to enter the slip state. can be easily realized.
Furthermore, since the other end 37 of the coil spring 27 is a free end, the coil spring 27 can continue to be in the slip state even if the rotor 5 continues to rotate.

(5) Furthermore, if the structure is such that the one end 33 of the coil spring 27 is locked to the guide member 8 and the rotational force of the rotor 5 is transmitted to the valve body 4 via the guide member 8, the one end 33 of the coil spring 27 can be Even structures in which it is difficult or undesirable to directly engage the valve body 4 can be easily accommodated.

(6) Further, the rotation regulating portion 29 regulates the rotation of the valve body 4 and the coil spring 27 by contacting the abutted portion 16 of the valve body side member 35. That is, the abutted portion 16 can reliably stop the rotation of the valve body 4 at a predetermined rotational position. Thereby, by setting the origin position of the valve body 4 to a position where the abutted portion 16 abuts the rotation regulating portion 29, the valve body 4 can be accurately returned to the origin position.

(7) Furthermore, the present invention can easily be applied to a valve body drive device 1 having a direct-acting structure in which the rotation of the rotor 4 is directly transmitted to the valve body side member 35.

[Embodiment 2]
Next, a second embodiment of the valve body driving device according to the present invention will be described based on FIG. 9. Note that the same parts as in Embodiment 1 are given the same reference numerals, and the explanation thereof will be omitted.
<Coil side friction part>
As shown in FIG. 9, in this embodiment, the portion of the coil spring 27 that contacts the attached portion 25 of the rotor 5 has a friction force different from that of the outer surface 22 of the coil spring 27, that is, is made of a different material. The coil-side friction portion 24 is provided with a coil-side friction portion 24 consisting of the following. Here, the coil-side friction portion 24 is provided only at a portion of the rotor 5 that contacts the attached portion 25, that is, on the inner peripheral side of the coil spring 27, but the present invention is not limited thereto. For example, the coil-side friction portion 24 may be provided so as to cover the entire outer surface 22 of the coil spring 27.

The coil-side friction part 24 can be provided by immersing the coil spring 27 in a friction part stock solution and then subjecting it to heat treatment, or by electroless plating. Note that by performing so-called masking, the coil-side friction part 24 can be provided only in the part that contacts the attached part 25. Of course, the method of providing the coil-side friction portion 24 is not limited to the above.

According to the above configuration, it is possible to design and manufacture the coil spring 27 by combining the friction force of the coil-side friction portion 24 and the tightening force of the coil spring 27, so it is easy to manufacture the coil spring 27 with the required characteristics. Become. Furthermore, even if it is difficult to create a coil spring 27 with the required characteristics using the friction force based on the material of the coil spring itself, this can be easily achieved by selecting the coil-side friction portion 24 to have the appropriate friction force. be able to.

Further, in this embodiment, the frictional force of the coil-side frictional portion 24 is formed to be larger than the frictional force of the outer surface 22 of the coil spring 27.
Thereby, even if the tightening force of the coil spring 27 is reduced, the frictional force necessary for switching between the power transmission state and the power non-transmission state can be obtained, and durability can be improved.

[Embodiment 3]
Next, a third embodiment of the valve body driving device according to the present invention will be described based on FIG. 10. Note that the same parts as in Embodiment 1 are given the same reference numerals, and the explanation thereof will be omitted.
<Rotor side friction part>
As shown in FIG. 10, in this embodiment, the attached portion 25 of the rotor 5 has a friction force different from the friction force on the outer surface of the attached portion 25, that is, the rotor-side friction portion 32 is made of a different material. It is equipped with The rotor-side friction portion 32 is provided on the entire surface of the attached portion 25, but is not limited thereto.
As long as the frictional force applied to the coil spring 27 is stable, the rotor-side frictional portion 32 does not need to be provided on the entire surface of the attached portion 25 . For example, a structure may be adopted in which a plurality of rotor-side friction portions 32 are arranged with ribs parallel to the shaft 2 spaced apart in the circumferential direction.

According to the above configuration, the attached portion 25 of the rotor 5 includes the rotor-side friction portion 32 having a friction force different from the friction force on the outer surface of the attached portion 25, so that the coil-side friction of the second embodiment The same effect as the structure including the portion 24 can be obtained by the rotor-side friction portion 32.

Further, in this embodiment, the frictional force of the rotor-side frictional portion 32 is formed to be greater than the frictional force of the outer surface of the attached portion 25.
Thereby, even if the tightening force of the coil spring 27 is reduced, the frictional force necessary for switching between the power transmission state and the power non-transmission state can be obtained, and durability can be improved.

[Embodiment 4]
Next, a fourth embodiment of the valve body driving device according to the present invention will be described based on FIG. 11. Note that the same parts as in Embodiment 1 are given the same reference numerals, and the explanation thereof will be omitted.
<Rough surface>
In the second embodiment, the coil side friction part 24 has a structure using a material different from that of the coil spring 27, but in this embodiment, as shown in FIG. It is made up of a rough surface 28 that has been roughened. Examples of the surface roughening method include a method of spraying powder.
With this configuration of the rough surface 28, the coil-side friction portion 26 can be easily formed without increasing the number of parts.
Note that the same effect can be obtained even if the rough surface 28 is provided by roughening the attached portion 25 of the rotor 5 instead of the coil spring 27.

[Other embodiments]
Although the valve body drive device 1 according to the present invention basically has the configuration described above, partial configuration changes or omissions may be made without departing from the gist of the present invention. Of course, this is also possible.

In the above embodiment, a direct-acting structure in which the valve body 5 is rotatably arranged on the shaft 2 of the rotor 5 has been described. The valve body may be rotatably provided on the other shaft to which the rotational power of the rotor 7 is transmitted via a second gear provided on the shaft.

In the above embodiment, the coil spring 27 has a structure made of a wire with a circular cross section, but is not limited to this structure, and may be a coil spring 27 made of a wire with a non-circular cross section, for example. It's okay.

DESCRIPTION OF SYMBOLS 1... Valve body drive device, 2... Shaft, 3... Flow path pipe, 3i... Inflow pipe,
3o...Outflow pipe, 4...Valve body, 5...Rotor, 6...Power transmission switching section,
7... Valve body, 8... Guide member, 9... Stator, 10... Convex part,
11... Sealing cover, 12... Hole, 13... Valve chamber, 14... Groove,
15...Base part, 16...Abutted part, 17...Magnet, 19...Valve seat surface,
20...Flat surface, 21...Valve seat component, 22...Outer surface,
24... Coil side friction part, 25... Attached part (small diameter part),
26... Coil side friction part, 27... Coil spring, 28... Rough surface,
29... Rotation regulating part, 31... Large diameter part, 32... Rotor side friction part,
33... One end, 35... Valve body side member, 37... Other end, 39... Ring plate

Claims (13)

A valve body that includes a valve body that opens and closes a flow path by rotating, and a rotor that rotates the valve body;
a stator that rotates the rotor;
a power transmission switching unit that switches between a power transmission state in which the rotational force of the rotor is transmitted to the valve body and a power non-transmission state in which the rotational force of the rotor is not transmitted to the valve body,
The power transmission switching section includes:
a coil spring disposed in a power transmission path between the rotor and the valve body and attached to apply a tightening force to an attached portion of the rotor;
a rotation restricting portion that restricts the coil spring from rotating together with the rotor;
The power transmission state is created by the coil spring rotating together with the rotor due to friction caused by the tightening force,
The power non-transmission state is such that the coil spring is prevented from rotating together with the rotor by the rotation regulating portion at a predetermined rotational position, and the coil spring slips with respect to the attached portion of the rotating rotor. made of
A valve body drive device characterized by the following. The valve body drive device according to claim 1,
The valve body is
An airtight cover that separates the inside and outside,
a base portion that is joined to the airtight cover and forms a valve chamber;
the valve body slides and rotates in contact with a valve seat surface of the base portion;
A valve body drive device characterized by the following. The valve body drive device according to claim 2 ,
The valve body opens and closes the outlet of the flow path by the slide rotation.
A valve body drive device characterized by the following. The valve body drive device according to any one of claims 1 to 3,
One end of the coil spring is locked to the valve body side member, and the other end is a free end.
A valve body drive device characterized by the following. The valve body drive device according to claim 4,
The valve body side member is
the valve body;
a guide member that rotates together with the valve body,
one end of the coil spring is locked to the guide member;
A valve body drive device characterized by the following. The valve body drive device according to claim 4 or 5,
The valve body side member includes an abutted portion,
The rotation regulating portion regulates rotation of the valve body and the coil spring by contacting the abutted portion.
A valve body drive device characterized by the following. The valve body drive device according to any one of claims 1 to 6,
The coil spring includes a coil-side friction portion, at least a portion of which comes into contact with the rotor, having a friction force different from a friction force on an outer surface of the coil spring.
A valve body drive device characterized by the following. The valve body drive device according to any one of claims 1 to 7,
The attached portion of the rotor includes a rotor-side friction portion having a friction force different from the friction force on the outer surface of the attached portion.
A valve body drive device characterized by the following. The valve body drive device according to claim 7 ,
The frictional force of the coil-side frictional part is greater than the frictional force of the outer surface of the coil spring or the attached part on which the frictional part is provided.
A valve body drive device characterized by the following. The valve body driving device according to claim 8 ,
The frictional force of the rotor -side frictional part is greater than the frictional force of the outer surface of the coil spring or the attached part on which the frictional part is provided.
A valve body drive device characterized by the following. The valve body drive device according to claim 7 or 9 ,
The coil-side friction portion is configured with a rough surface obtained by roughening the surface of the coil spring or the surface of the attached portion.
A valve body drive device characterized by the following. The valve body drive device according to claim 8 or 10 ,
The rotor -side friction portion is configured with a rough surface obtained by roughening the surface of the coil spring or the surface of the attached portion.
A valve body drive device characterized by the following. The valve body drive device according to any one of claims 4 to 6 ,
the valve body side member is arranged on a shaft around which the rotor rotates;
A valve body drive device characterized by the following.

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