JP4970708B2 - Motorized valve - Google Patents

Description

  The present invention relates to an electric valve used in a refrigeration cycle such as an air conditioner or a refrigerator, and more specifically, a rotary shaft that is rotated by a stepping motor and a valve body that is separated from and connected to a valve seat by the rotation of the rotary shaft. It is related with the motor operated valve which consists of.

Conventionally, an electric valve used by being incorporated in a refrigeration cycle of this type of air conditioner or refrigerator has a function of adjusting a flow rate of a fluid such as a refrigerant, and usually includes a valve chamber and a valve seat. It has a valve body and a bottomed cylindrical can fixed to the upper part of the valve body. A rotor that is rotationally driven by electromagnetic force is built inside the can, and a stepping motor together with the rotor is placed outside the can. The stator which comprises is externally fitted.
Various types of this type of motor-operated valve have been proposed in the past. FIG. 6 is a longitudinal sectional view showing the conventional electric valve.

  This known motor-operated valve 1 includes a block-shaped valve body 4 that adjusts the flow rate of refrigerant through a valve body 3 that is separated from and connected to a valve seat 2 c in a valve chamber 2, and a valve body 3 that is fixed to the valve body 4. A can 6 having a built-in rotor 5 is provided, and a stator 8 that is fitted on the can 6 and rotationally drives the rotor 5. The rotor 5 and the stator 8 constitute a stepping motor. A valve body 3 is provided concentrically at the lower part of a valve rod that is rotationally driven by this stepping motor. In addition, refrigerant inflow / outflow pipes 2a and 2b are connected to and connected to the valve chamber 2 at the lower and side portions of the valve main body 4, and the outflow / inflow pipes 2a and 2b protrude in directions orthogonal to each other.

The can 6 has a bottomed cylindrical shape, and the inside thereof is kept airtight. The stator 8 includes a yoke 8a made of a magnetic material, and upper and lower stators wound around the yoke 8a via a bobbin 8b. A fitting hole 8d that is formed from the coil 8c and is fitted to the can 6 is formed.
In the electric valve 10 having such a configuration, the rotational motion of the rotor is transmitted to the valve stem, and the rotational motion of the valve stem is converted into a linear motion in which the valve stem moves up and down using a screw mechanism. Therefore, the valve stem performs a linear motion together with the rotational motion, and the valve body comes into contact with and separates from the valve seat.

JP 2000-220759 A

The motor valves that have been proposed in the past have the following problems. That is,
The conventional product has a problem that the valve seat may be worn out according to the frequency because the valve body rotates repeatedly in synchronism with the drive screw of the screw mechanism and repeatedly comes in contact with the valve seat. In addition, since the valve body shape is a cylindrical shape that forms a block shape, there is a disadvantage that the processing becomes complicated and the processing cost increases. Moreover, since the inflow / outflow pipe on one side protrudes radially from the side portion of the cylindrical main body, it is not easy to maintain the posture at the time of assembly, which may cause problems in assembly and productivity.

Therefore, in order to reduce the processing cost of the valve body, for example, when a brass material is used, it is necessary to separately provide a joint member for joining with the can. That is, in order to omit this joint member, if a material capable of ensuring airtightness such as TIG welding is used, for example, SUS304, workability is deteriorated, resulting in a significant increase in cost, resulting in poor productivity and economy. Occurs.
In order to efficiently convert rotational torque into axial force, that is, vertical motion, it is effective to reduce the screw size of the screw mechanism as much as possible. However, in the conventional product, the valve body is concentric with the drive screw. Therefore, for the convenience of assembly, the drive screw size was also limited by the valve body size. In other words, in order to make a large valve body, it is necessary to increase the screw size or use an expensive high magnetic force magnet. For this reason, the motor-operated valve cannot be miniaturized, resulting in an increase in manufacturing cost. .

  In addition, as a further issue, we examined the reduction in manufacturing cost by simplifying the configuration of the stepping motor, and examined the application to, for example, a low-priced room air conditioner that uses a capillary tube or the like instead of a motorized valve. .

  Therefore, the present invention has been made paying attention to the above-mentioned problems, and in a motor-operated valve in which a valve body is brought into and out of contact with a seat portion by using a stepping motor, the valve characteristics are excellent, and the rotational drive portion can be downsized. It is an object to provide a motor-operated valve having a simplified structure and excellent productivity and economy.

To achieve the above object, the electric valve of the present invention basically comprises a valve body, a valve body supported so as not to move freely and rotation in the vertical direction with respect to the valve body, extending in the vertical direction with a rotary shaft supported in rotation the self-standing relative to said valve body, screwed to the screw portion provided in the valve body is provided on the outer periphery of the rotating shaft of the valve body the rotation of said rotary shaft A feed screw that converts to a movement in the vertical direction, a rotor fixed to the rotating shaft, a can located on an outer periphery of the rotor, and a stator that forms a stepping motor together with the rotor , and the valve body includes: to form a seat portion having a seat hole in its upper surface, is fixed to the can on the upper surface periphery, said valve body is integrally provided with Rutotomoni a lid for opening and closing the seat hole, the valve body To be guided vertically Includes a guide hole as a de part integrally, wherein the lid, the opening of the seat hole the sheet hole without projects into while separable in the seat formed around the sheet hole It is formed in a planar shape covering the part.

And the said rotor is provided with the engagement protrusion on the internal peripheral surface, and the said valve body is provided with the stopper part located in the said internal peripheral surface of the said rotor, and the said engagement is performed when the said rotor rotates. A protrusion abuts against the stopper portion to prevent rotation of the rotor, and by rotating the stepping motor, the valve body is moved up and down, and the size of the gap between the seat portion and the lid portion is increased. The flow rate of the fluid passing through the sheet hole is controlled by changing the flow rate.

Furthermore, another aspect of the motor-operated valve of the present invention includes a valve body, a valve body supported so as to be movable in the vertical direction and not to rotate with respect to the valve body, and extending in the vertical direction with respect to the valve body. A rotation shaft supported rotatably and a screw portion provided on the outer periphery of the rotation shaft and provided on the valve body to convert the rotation of the rotation shaft into a vertical movement of the valve body. A feed screw, a rotor fixed to the rotating shaft, a can located on an outer periphery of the rotor, and a stator that forms a stepping motor together with the rotor, and the valve body has a seat hole on an upper surface thereof The can is fixed to the outer periphery of the upper surface of the seat, and the valve body is integrally provided with a lid for opening and closing the seat hole, and the guided body guides the valve body in the vertical direction. Guide hole The lid portion is integrally formed, and is formed in a planar shape that contacts and separates from the sheet portion formed around the sheet hole and covers the opening of the sheet hole without entering the sheet hole. The rotor includes an engagement protrusion on an inner peripheral surface thereof, and the valve body includes a stopper portion located in the inner peripheral surface of the rotor, and an inner portion of the rotor above the valve body . to the rotating shaft of the inner peripheral surface, mounting the idler ring projecting from the receiving portion and a rotor stopper to the outer peripheral portion rotatably, those on the receiving portion and the engaging projection is by the rotor is rotated rotating the idler ring in contact, said rotor stopper is contact with the stopper portion to prevent rotation of the rotor, is moved up and down the valve body by rotating the stepping motor, said seat portion The size of the gap between the lid It is characterized by controlling the flow rate of fluid through the sheet holes by changing.

Furthermore, another specific embodiment of the electric valve of the present invention, the valve body is a resin molded article is characterized in that the idler ring is a resin molded product.

By the above means, the motor operated valve of the present invention has the following effects. That is , since the internal thread of the valve body and the external thread of the rotating shaft are integrally formed, an electric valve having a very simplified configuration has been obtained. Further, since the valve body has a shape which does not rush into the sheet holes formed in the seat portion with only move up and down by the rotational motion of the rotating shaft, and reduce the need to accurately position the valve body relative to the seat hole, Productivity can be improved. Furthermore, since the valve body is not rotated, wear can be suppressed.

Moreover, since forming the lid on the seat portion side of the valve body to cover the opening of the seat hole, and further reduced the need to accurately position the valve body relative to the seat hole. In addition , since the guided portion for guiding the vertical movement of the valve body, in particular, the guided hole is provided integrally, and the guide for guiding the vertical movement of the valve body is provided in the valve body, the number of parts of the entire motorized valve is further increased. The configuration was simplified by reducing the number.

Also, since to form a stopper portion for stopping the rotation of the rotor to guide, it is possible to eliminate the impact caused by the rotation stop of the valve body. Further , since the valve body is provided with the stopper portion for stopping the rotation of the rotor, the entire configuration of the motor-operated valve is further simplified.
In addition , an idle ring is provided in the vicinity of the valve body, and the idle ring is provided with a receiving portion that comes into contact with the stopper portion and a rotor stopper that stops the rotation of the rotor. The gap between the opening of the seat hole and the valve body (the degree of opening, that is, the refrigerant flow rate) can be set in more stages.

Also, Yu rolling rings from being placed in the rotor, it is not necessary to newly consider the space for arranging the idler ring, it is possible to prevent an increase in size of the electric valve.
Also, Yu rolling rings from being placed in the vicinity of the outer peripheral portion of the rotation shaft side of the male screw, displacement due rotation-stop without the core can be smoothly performed. Further, the valve body or idle ring, by constituting an integral resin molded product, it is possible to cost reduction of parts cost.

  Hereinafter, embodiments of the expansion valve according to the present invention will be described with reference to the drawings.

Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1A is a longitudinal sectional view thereof, FIG. 1B is a partial longitudinal sectional view of another example, FIG. 2 is an explanatory diagram of the main part thereof, and FIG. 3 is a bottom view of the main part thereof.
The motor-operated valve 10 according to the first embodiment of the present invention includes a valve body 12, a stepping motor including a stator 40 and a rotor 23.

First, the valve body 12 will be described.
A first fluid inlet / outlet hole 12a and a second fluid inlet / outlet hole 12b are formed in the valve body 12 having a substantially circular shape in plan view, and the first fluid inlet / outlet pipe 11a is connected to the first fluid inlet / outlet hole 12a. A second inflow / outflow pipe 11b is connected to 12b. Further, the second fluid inlet / outlet hole 12b is formed with a sheet hole 12e to be described later. Further, a seat portion 12d is formed on the upper surface of the valve body 12 and on the valve chamber 18 side of the upper surface of the peripheral portion of the seat hole 12e.

A bearing portion 12c having a concave upper surface is formed on the valve chamber 18 side of the central portion of the valve body 12, and two rod-shaped guides 17 having a predetermined length (height) are separated from the bearing portion 12c by a predetermined distance. Established. And this guide 17 is penetrated by the guide rod hole 15f formed in the below-mentioned valve body 15 side. In other words, the valve body 15 is guided by the guide 17 and is arranged so as to be able to move only up and down.
Further, as shown in FIG. 1B, the bearing portion 12c may be formed separately from the valve body 12, and may be integrated with the valve body 12 by welding to be provided in the valve body 12.

  Further, a can 26 is welded to the outer periphery of the upper surface of the valve body 12, and the lower end of the rotary shaft 21 is pivotally supported by the bearing portion 12c. Further, a receiving recess 26a is formed on the upper bottom portion of the can 26 so as to have a concave shape inside, and a spring receiving cup in which the upper portion of the rotating shaft 21 is supported via a bush 22 and a coil spring 24. 25 is arranged. As shown in FIG. 4 in particular, the spring receiving cup 25 has a substantially inverted cup shape. A spherical convex portion 25b is formed on the upper bottom portion of the spring receiving cup 25 so as to be supported by the receiving concave portion 26a. A receiving step portion 25a is formed.

A feed screw 21a is formed on the outer peripheral portion of the rotary shaft 21, and a valve body 15 that moves up and down by the feed screw 21a is arranged concentrically. The rotor 23 is fixed via 22.
As shown in FIG. 1-3, the valve body 15 has a cylindrical shape composed of a large diameter portion 15a and a small diameter portion 15b as a whole, and a rotary shaft hole 15d is formed in the vertical direction in the center of the valve body 15. A female screw portion 15e is formed on the inner peripheral surface of the rotary shaft hole 15d. Further, as shown in FIG. 3, a flat lid portion 15c having a predetermined height covers a wider area than the opening portion of the sheet hole 12e on the lower surface (sheet portion contact surface) of the large diameter portion 15a. Are formed with a predetermined length and width in the circumferential direction. In addition, guide rod holes 15f are formed vertically at two locations in the vicinity of the outer peripheral portion of the large diameter portion 15a.

Further, as shown in FIG. 2, a vertically long stopper portion 15g is formed at one place on the outer peripheral surface of the small diameter portion 15b. As described above, the valve body 15 is arranged so that the rotation shaft hole 15d is inserted through the rotation shaft 21, and in this state, the feed screw 21a is rotated by the rotation of the rotation shaft 21, and the female screw portion 15e. Is sent up and down, and as a result, the valve body 15 moves up and down correspondingly according to the rotation angle of the rotary shaft 21. By direct transmission (drive) between the feed screw 21a formed on the outer periphery of the rotary shaft 21 and the female thread portion 15e of the valve body 15, smooth transmission and simplification of the configuration are realized.
Further, by the vertical movement of the valve body 15, the lid portion 15c comes into contact with the upper surface of the seat portion 12d, and the seat hole 12e is opened and closed by a predetermined amount. Further, a rod-shaped guide 17 provided on the upper surface (valve chamber 18 side) of the valve body 12 is inserted into the guide rod hole 15f.
The valve body 15 is integrally formed as a whole for simplification of processing. Therefore, a synthetic resin such as Teflon (registered trademark) or carbon-containing PPS material having better lubricity than the metal material is formed as the material.

A rotor 23 is fixed to the upper portion of the rotating shaft 21 via a bush 22. A coil spring 24 is mounted between the upper surface of the bush 22 and the spring receiving step portion 25 a of the spring receiving cup 25. That is, the valve body 15 is pressed in the direction of the seat portion 12d. The coil spring 24 has a buffering function when the valve is closed.
A rotor wire 29 is wound around a coil bobbin 27 via a stator yoke 32 on the outer surface of the can 26. The outer surface of the rotor wire 29 is covered with a tape 30, and a mold 31 and a stator cover 33 are further provided. Is provided. An engaging protrusion 23 a is formed on the inner peripheral surface of the rotor 23 in parallel with the rotating shaft 21. In the figure, reference numeral 28 denotes a terminal.

With this configuration, when energized through the terminal 28, the rotor 23 rotates and the rotating shaft 21 integrated with the rotor 23 also rotates. Due to the rotation of the rotating shaft 21, the valve body 15 whose rotation is restricted by the guide 17 through the feed screw 21a moves up and down. By the vertical movement of the valve body 15, the lid portion 15 c comes in contact with the seat portion 12 d, and the amount of refrigerant passing through the seat hole 12 e is controlled according to the degree of separation (gap).
Thus, the valve body 15 moves up and down without the vertical movement of the rotary shaft 21 only by the rotation of the rotary shaft 21 due to the rotation of the rotor 23, and the valve body 15 comes into contact with and separates from the seat portion 12d.

The valve body 15 by the rotation of the rotary shaft 21 is moved up and down, the stopper portion 15g with respect to the engaging protrusion 23a is made to move up and down, in the state of the valve body 15 is FIG. 1 (A), the engagement The mating protrusion 23a abuts against the stopper portion 15g, thereby stopping the rotation of the rotor 23. According to the first embodiment, the valve body 15 can be opened and closed within one rotation of the rotor. Further, since the valve body 15 only moves up and down, the valve body 15 or the seat portion 12d is not worn.

  With the above configuration, since the number of rotations of the rotor is smaller than that of the conventional one, the structure can be simplified and the size can be further reduced. In addition, an electric valve having excellent durability can be realized.

A second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a longitudinal sectional view thereof, and FIG. 5 is an explanatory view of a main part of FIG. The same components as those of the first embodiment are denoted by the same reference numerals as those shown in FIGS. 1 to 3 in FIGS.
As shown in FIG. 4, the motor-operated valve 10 ′ according to the second embodiment is provided with an idle ring 19 concentrically on the rotary shaft 21 in the vicinity of the upper portion of the valve body 15. The idler ring 19 is provided with a receiving portion 19a that comes into contact with the stopper portion 15g and a rotor stopper 19a that also serves as the receiving portion 19a that stops the rotation of the rotor 23.
The idle ring 19 is integrally formed as a whole for simplification of processing. Therefore, a synthetic resin such as Teflon (registered trademark) or carbon-containing PPS material having better lubricity than the metal material is formed as the material.

With this configuration, the rotation stop timing of the rotor 23 is postponed compared to the first embodiment. This is to allow the engagement protrusion 23a to indirectly contact the stopper portion 15g by adding the idle ring 19 so as to delay the rotation stop of the rotor 23. Can be set more finely. In the second embodiment, the receiving portion 19a and the rotor stopper 19a are the same member, but may be separate members (in this case, they are arranged at a predetermined angle according to the stop angle position of the rotor).

The longitudinal cross-sectional view (A) of Example 1 which concerns on this invention, and the partial longitudinal cross-sectional view (B) of another example. Explanatory drawing of the principal part of the Example 1. FIG. The principal part bottom view of the Example 1. FIG. The longitudinal cross-sectional view of Example 2 which concerns on this invention. Explanatory drawing of the principal part of Example 2 which concerns on this invention. The longitudinal cross-sectional view of the expansion valve which concerns on a prior art.

10 .... Motorized valve (Example 1) , 10 '... Motorized valve (Example 2) ,
11a ··· First inflow / outflow pipe ,
11b .. Second inflow / outflow pipe , 12 .. Valve body , 12a .. First fluid inlet / outlet hole ,
12b .. Second fluid inlet / outlet hole , 12c .. Bearing part , 12c '.. Bearing member ,
12d seat part ,
12e ... seat hole , 15 ... valve body , 15a ... large diameter part , 15b ... small diameter part ,
15c ... Lid , 15d ... Rotating shaft hole , 15e ... Female thread ,
15f ··· Guide rod hole , 15g · · Stopper portion , 17 · · Guide ,
17a ·· stopper portion, 18 ... valve chamber,
19 ... idling ring (Example 2), 19a ·· receiving portion Lotus stopper,
21 ... rotary shaft, 21a ... feed screw, 22 ... bush, 23 ... rotor,
23a ... engaging ridges, 24 ... coil springs , 25 ... spring receiving cups ,
25a ... Spring receiving step , 25b ... Projection , 26 ... Can ,
26a ·· receiving concave portion, 27 ... coil bobbin, 28 ... terminal,
29. Rotor wire , 30 ... Tape , 32 ... Stator yoke ,
33..Stator cover , 40..Stator

Claims (4)

A valve body, a valve body supported so as not to move freely and rotation in the vertical direction with respect to the valve body, a rotary shaft supported in rotation the self-standing with respect to said valve body extends vertically, the A feed screw provided on the outer periphery of the rotary shaft and screwed into a screw portion provided on the valve body to convert rotation of the rotary shaft into vertical movement of the valve body, and a rotor fixed to the rotary shaft When, a scanning and an electric valve and a stator constituting the stepping motor together with the rotor located on the outer periphery of the rotor,
The valve body forms a seat portion having a seat hole on the upper surface thereof, and the can is fixed to the outer periphery of the upper surface,
The valve body is provided with integrally with integrally with Rutotomoni, a guided portion for guiding the valve body in the vertical guide holes a lid for opening and closing the seat hole, and the lid, is formed in a planar shape for covering the opening of the seat hole without rush to the seat bore while separable in the seat formed around the seat hole,
The rotor includes an engagement protrusion on an inner peripheral surface thereof, and the valve body includes a stopper portion located in the inner peripheral surface of the rotor, and the engagement protrusion is formed by the rotation of the rotor. Abuts against the stopper portion to prevent rotation of the rotor,
The valve body is moved up and down by rotating the stepping motor, and the flow rate of the fluid passing through the seat hole is controlled by changing the size of the gap between the seat portion and the lid portion. Motorized valve. A valve body, a valve body supported so as to be movable in the vertical direction and not to rotate with respect to the valve body, a rotary shaft extending in the vertical direction and supported rotatably with respect to the valve body, and the rotation A feed screw that is screwed into a screw portion provided on the outer periphery of the shaft and is provided on the valve body to convert the rotation of the rotating shaft into a vertical movement of the valve body; and a rotor fixed to the rotating shaft; An electric valve comprising a can located on an outer periphery of the rotor, and a stator that forms a stepping motor together with the rotor,
The valve body forms a seat portion having a seat hole on the upper surface thereof, and the can is fixed to the outer periphery of the upper surface,
The valve body is integrally provided with a lid portion that opens and closes the seat hole, and is integrally provided with a guide hole serving as a guided portion that guides the valve body in the vertical direction. It is formed in a flat shape covering the opening of the sheet hole without entering into the sheet hole and coming into contact with and separating from the sheet part formed around the sheet hole,
The rotor includes an engagement protrusion on an inner peripheral surface thereof, and the valve body includes a stopper portion located in the inner peripheral surface of the rotor, and an inner peripheral surface of the rotor above the valve body. the rotation axis of the attaching a idling ring projecting from the receiving portion and a rotor stopper to the outer peripheral portion rotatably, contact with the receiving portion and the engaging projection is by the rotor rotates the rotate the idler ring, said rotor stopper is contact with the stopper portion to prevent rotation of said rotor,
The valve body is moved up and down by rotating the stepping motor, and the flow rate of the fluid passing through the seat hole is controlled by changing the size of the gap between the seat portion and the lid portion. electric valve to be. The motor-operated valve according to claim 1 , wherein the valve body is a resin molded product. The motor-operated valve according to claim 2 or 3, wherein the idle ring is a resin molded product.

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