JP3454603B2 - Electric control valve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric control valve capable of controlling a flow rate, and more particularly to an electric control valve in a refrigerant system or an air conditioning system.

[0002]

2. Description of the Related Art FIG. 15 shows a conventional electric control valve used in a refrigerant system or an air conditioning system disclosed in Japanese Patent Publication No. 4-68510. This valve is a direct-acting type in which a needle valve body is integrally incorporated inside the motor so that it can be miniaturized, and the needle valve 103 that comes into contact with and separates from the valve seat 102a of the valve body 101 is Male screw tube 10 provided on the valve body 101
4, a rotor 109 having a permanent magnet 111 is provided so as to be rotatable and axially movable by screwing a female screw tube 112 provided at the center thereof into the male screw tube 104. The end of the needle valve 103 is connected to the axially intermediate portion of the rotor 109.

FIG. 16 is a cross-sectional view showing another example of a conventional electric control valve used in the refrigerant system or the air conditioning system disclosed in Japanese Patent Laid-Open No. 1-261579. This valve relates to an electromagnetic flow control valve that operates the valve by a pulse width modulation method that controls the energization time, and is particularly a flow control valve in a refrigeration system.

This valve has a plurality of inlets / outlets 201a, 2a.
Valve seat 202 having at least one groove portion 202a communicating with one of the inlets and outlets 201a and 201b on the inner wall surface of the cylindrical valve body 201 forming the cylindrical closed space 220 having 01b, and the valve seat A rotor 204 having one end inserted into 202 and a rotor 206 having a plurality of magnetic poles at the other end, and a part of the portion of the rotor 204 inserted into the valve seat 202. At least one groove portion 204a, which has one end that engages with a part of the groove portion 202a and the other end that can communicate with another inlet / outlet via the outer cylindrical closed space 220, is provided on the outer surface in the vicinity thereof. And a stopper mechanism 204b for controlling the rotation of the rotor 204 is provided between the rotor 204 and the valve seat 202, and the cylindrical valve body 2
A plurality of magnetic poles whose polarities can be changed are arranged at a position corresponding to the rotor 206 on the outer surface of 01, and the rotor 204 is rotated by changing the magnetic poles so that the both groove portions 202a, It is characterized by controlling the engagement of 204a.

With the above-described structure, this valve can reciprocate the rotor 204 with one electromagnetic coil 209c and can control the flow rate of the fluid, so that the drive unit can be made smaller than the valve mechanism using the stepping motor. Other than that,
The structure is simple because no screws are used. Further, since the rotational force of the rotor 204 does not change with respect to the pressure change of the primary side opening and the secondary side opening and the rotor can be rotated with a small force, the electromagnetic coil 209c itself can be downsized and stable operation can be obtained. .

[0006]

However, in the conventional electric control valve shown in FIG. 15, screws are used for the male screw pipe and the female screw pipe, that is, the rotor and the needle valve use the screw. Since it is engaged via the valve, multiple rotations are required to adjust the flow rate, and a stopper mechanism for setting the number of rotations of the rotor with respect to the needle valve is required, which complicates the valve structure. Furthermore, when using the valve, it was necessary to adjust the position of the stopper or the like in order to keep the relationship between the position of the needle valve and the flow rate constant.

Further, in the conventional electric control valve shown in FIG. 16, since the rotor slides on the valve seat, dust is easily caught, the groove of the valve seat is worn, and the flow rate changes. To do. Also, when the valve is opened / closed or half-opened, the fluid is blocked at a right angle to the flow direction.
A vortex is generated, the valve vibrates and is easily eroded.

The present invention has been made in view of the problems of the conventional electric control valve described above. It is not necessary to use a screw, the structure is simple, dust and the like are hard to be caught, and the valve port section is further provided. It is an object of the present invention to provide an electric control valve that is less likely to be worn out or vibrated, and is not easily corroded.

It is another object of the present invention to provide an electrically-operated control valve having good responsiveness, which is capable of controlling a range from a minimum flow rate to a maximum flow rate by rotating the rotor one revolution or less.

A further object of the present invention is to provide an electric control valve that can obtain the same flow rate even if the fluid flow is switched bidirectionally.

It is another object of the present invention to provide an electric control valve which can smoothly rotate the valve portion and can set the motor power low.

A further object of the present invention is to provide an electric control valve which does not require a stopper position adjustment at the time of assembly and which can prevent variations in flow characteristics between valves of the same type.

Further, according to the present invention, it is possible to provide an electric control valve having a long life by preventing abrasion of the sliding portion of the shaft portion with respect to the valve body side.

[0014]

The invention according to claim 1 is
A motorized control valve in which a rotor portion having a permanent magnet and a shaft portion that integrally rotates constitutes a rotor portion of a stepping motor, and the rotor portion is arranged in a sealed space formed by a valve body and a sealed case. A valve portion is formed on the shaft portion, and a gap is formed between the valve port portion provided on the valve body and the peripheral surface of the valve portion facing the valve port portion. The flow rate is controlled by changing the rotation of the rotor according to the cross-sectional shape perpendicular to the axis of the shaft part.

The invention according to claim 1 is characterized in that the valve portion has the same cross section in the axial direction of the shaft portion.

Further, the invention according to claim 1 is provided with a valve port portion which communicates with two pipes formed in the valve body , and the two valve formed in the valve body.
The port part is located on the same plane including the axis of the shaft part.
And are arranged in two stages in the axial direction.

Further, according to the invention as set forth in claim 1, the gap formed between the valve port portion and the peripheral surface of the valve portion is equal in each valve port portion at any rotational position of the shaft portion. It is characterized by having done.

[0018]

According to a second aspect of the present invention, the rotor is integrally provided with a stopper and the valve body is integrally provided with a stopper to limit the rotation of the rotor with respect to the valve body. And

According to a third aspect of the present invention, the shaft portion is rotated integrally with the rotor by inserting the shaft portion into an engagement hole extending in the axial direction of the rotor. And

According to a fourth aspect of the present invention, the cross section of the insertion portion of the shaft portion into the rotor and the cross section of the engagement hole of the rotor are D-shaped obtained by cutting out a part of a circular cross section. It is characterized by

According to a fifth aspect of the present invention, the rotor and the shaft portion are integrally formed by a plastic magnet.

The invention according to claim 6 is characterized in that at least a sliding portion of the shaft portion with respect to the valve body side is coated with a synthetic resin.

The invention according to claim 7 is characterized in that the shaft portion is formed of a synthetic resin, and a metal mandrel extending in the axial direction of the shaft portion is inserted inside the shaft portion.

[0025]

According to the first aspect of the present invention, only by rotating the shaft portion having the valve portion integrally with the rotor, the valve port portion and the peripheral surface of the valve portion facing the valve port portion are opposed to each other. The flow rate can be controlled by changing the gap formed by and by the rotation of the rotor according to the sectional shape perpendicular to the axis of the shaft portion of the valve portion. Further, by rotating the rotor less than one rotation, it is possible to control the range from the minimum flow rate to the maximum flow rate. Further, the circumferential surface of the valve portion moves in the direction of approaching and separating from the valve port in the axial direction of the valve port portion, and does not block the fluid at right angles to the flow direction.

According to the first aspect of the invention, the valve portion is formed to have the same cross section in the axial direction of the shaft portion, so that the valve portion can be easily processed.

Further, according to the first aspect of the invention, when one of the two pipelines is used as the fluid inlet and the other is used as the fluid outlet, the circumference of the valve port portion and the valve portion is provided in each pipeline. Since the gap formed by the surfaces is the same, it is possible to achieve the same flow rate even if the fluid flow is switched bidirectionally.

Further, according to the first aspect of the invention, the two valve port portions formed on the valve body are arranged in two stages in the axial direction on the same plane including the axis of the shaft portion. Therefore, the maximum flow control range can be obtained in the valve of the type in which the valve port communicates with the valve chamber in the direction perpendicular to the axis of the shaft. Further, since the fluid flows in or out from the direction perpendicular to the axis of the shaft portion, the load applied to the rotor by the fluid in the rotor axial direction is reduced. Further, when the pipes are connected to the valve from the same direction, the pipe mounting work becomes easy.

[0029]

According to the second aspect of the present invention, since the stopper is provided integrally with the rotor and the stopper is provided integrally with the valve main body side, only these stopper positions and the shapes of the valve portion and the valve port portion are required. , The flow characteristics of individual valves can be determined.

According to the third aspect of the invention, the rotor is engaged with the shaft portion only by inserting the shaft portion into the engagement hole of the rotor,
It is possible to configure a shaft portion that rotates integrally with the rotor.

According to the fourth aspect of the invention, the rotor and the shaft can be engaged with each other and the rotor and the shaft can be positioned relative to each other only by inserting the shaft into the engagement hole of the rotor. .

According to the fifth aspect of the invention, since the rotor and the shaft portion are integrally molded with a plastic magnet, the rotor and the shaft portion do not need to be engaged or positioned.

According to the sixth aspect of the present invention, since the sliding portion of the shaft portion with respect to the valve body side is covered with the synthetic resin, wear of the sliding portion of the shaft portion with respect to the valve body side can be prevented.

According to the invention of claim 7 , since the valve portion is formed of synthetic resin and the metal mandrel extending in the axial direction of the valve portion is inserted into the valve portion, the mechanical structure of the valve portion is improved. Wear can be prevented at the sliding portion of the valve portion with respect to the valve body side while ensuring strength.

Embodiments of the electric control valve according to the present invention will be described below with reference to the drawings.

[0037] FIG. 1 is a sectional view showing an electric control valves according to a reference example of the present invention. This electric control valve is composed of a valve section V and a stepping motor section M. The valve portion V is composed of a valve body 1, a shaft portion 3, and a rotor 9 including a permanent magnet 11 and a spacer 12.

A primary port 1a and a secondary port 1b are formed in the valve body 1, and a fluid such as a refrigerant flows in or out through the primary port 1a and the secondary port 1b. The valve body 1 also has a function of guiding the shaft portion 3, and a guide portion 1g for the shaft portion 3 is provided in the vertical direction.

A valve portion 3a is formed at the lower end of the shaft portion 3. The sectional shape of the valve portion 3a is constant in the axial direction, and a specific example of this shape is shown in FIGS. 3 and 4 as a sectional view taken along line II-II of FIG. The flow rate characteristics when the cross-sectional shapes shown in these figures are adopted will be described later.

The valve portion 3a of the shaft portion 3 of the primary port 1a of the valve body 1
The space in which is stored constitutes the valve chamber 20, the lower part of the valve chamber 20 communicates with the primary port 1a, and the valve chamber 20 and the secondary port 1b communicate with each other through the valve port portion 1c.

The shaft portion 3 and the rotor 9 are integrated to form a rotor portion 30, and the rotor portion 30 thus integrated is placed on the upper end surface 1d of the valve body 1. In this embodiment, the rotor 9 is composed of the permanent magnet 11 and the spacer 12, but it may be composed of only the permanent magnet 11.

A step portion 1e is formed at the center of the outer periphery of the valve body 1, and the lower lid 5 is fixed onto the step portion 1e by brazing. Further, the closed case 6 of the stepping motor unit M is fixed on the lower lid 5. Further, a stator 8 having a coil 7 built-in is provided on the outer peripheral portion of the case 6, and the rotor portion 30 in which the shaft portion 3 and the rotor 9 are integrated as described above is provided in the case body 6 in the valve body. It is rotatably provided on the unit 1.

As shown in FIGS. 1 and 2, a step portion 12a is formed in the lower portion of the rotor 9, and the step portion 12a functions as a stopper integrated with the rotor 9. On the other hand, the lower lid 5 is provided with a protrusion 5a, and the protrusion 5a functions as a stopper on the main body side integrally provided on the lower lid 5.

In the above structure, the coil 7 of the stator 8
When electricity is applied to the permanent magnet 11, the permanent magnet 11 rotates, and the shaft portion 3 also rotates according to the rotation of the permanent magnet 11. When the shaft 3 rotates,
The angle of the valve portion 3a with respect to the valve port portion 1c changes according to the rotation angle of the shaft portion 3, and is formed by the valve port portion 1c and the peripheral surface of the valve portion 3a facing the valve port portion 1c. Since the gap changes due to the rotation of the rotor 9 according to the sectional shape of the valve portion 3a perpendicular to the axis of the shaft portion 3, it is possible to control the flow rate of the fluid such as the refrigerant.

Next, flow rate characteristics when the cross-sectional shape of the valve portion 3a is changed will be described with reference to FIGS.

In FIG. 3, the valve portion 3a has a spiral cross section. FIG. 5 shows an example of flow rate characteristics when this cross-sectional shape is adopted. By changing the spiral cross-sectional shape of the valve portion 3a, various flow rate characteristics as shown in this figure can be obtained. In any of the above cases, the flow rate can be controlled within the range where the rotation angle of the valve portion 3a is 0 ° to about 270 °.

In FIG. 4, the cross section of the valve portion 3a is circular, and the center of the circle is eccentric from the center of the valve chamber 20. FIG. 6 shows an example of flow rate characteristics when this cross-sectional shape and position are adopted. When this sectional shape is adopted, the relationship between the rotation angle of the valve portion 3a and the flow rate is represented by a sine curve, and the flow rate can be controlled within the range of the rotation angle of the valve portion 3a from 0 ° to about 270 °. However, since the cross-sectional shape of the valve portion 3a is line-symmetric with respect to the axis of the valve port portion 1c, the substantial flow control range is 0 ° to about 135 °. The minimum flow rate and the maximum flow rate can be changed by changing the eccentric amount of the circular cross section. However, even in this case, the relationship between the rotation angle of the valve portion 3a and the flow rate draws a sine curve similar to the above.

Next, the electric controller according to the above-mentioned reference example.
A first embodiment of the electric control valve according to the present invention to which the configuration of the roll valve is applied will be described. the above
In the reference example , since there is a gap between the guide portion 1g and the shaft portion 3, when the fluid flows from the pipeline 1a to the pipeline 1b, the valve portion 3a is attracted to the valve port portion 1c, and When the fluid flows from the conduit 1b toward the conduit 1a, the valve portion 3a moves away from the valve port portion 1c. Therefore,
Depending on the direction of the flow of the fluid, even if the rotation angle of the shaft portion 3 is the same, the gap formed by the valve port portion 1c and the valve portion 3a changes, so the flow rate also changes. That is, even if the rotation angle of the shaft portion 3 is the same, the flow rate is not the same when the fluid flows from the conduit 1a to the conduit 1b and when the fluid flows from the conduit 1b to the conduit 1a. I won't.

Of the electric control valve according to the present invention
The first embodiment provides an electric control valve having the same flow rate when the fluid flows from the pipeline 1a to the pipeline 1b and when the fluid flows from the pipeline 1b to the pipeline 1a. Is.

FIG. 7 is a sectional view of a first embodiment of the electric control valve of the present invention, and FIG. 8 is a section III of FIG.
It is a III-line sectional view. In this embodiment, the pipelines 1a, 1
b is arranged in two stages in the axial direction on the same plane including the axis of the shaft portion 3. That is, they are arranged in two stages at positions overlapping each other when viewed from above in FIG. 7. In addition, the respective conduits 1a and 1b are connected to the valve port portions 1c and 1c.
It communicates with the valve chamber 20 via c '. The valve portion 3a is formed longer in the axial direction of the shaft portion 3 than in the first embodiment in order to control the flow rate of the fluid from both valve port portions 1c and 1c '. The other structure is almost the same as that of the first embodiment.

As shown in FIG. 8, the cross-sectional shape of the valve portion 3a is spiral, and the valve portions 3a have the same cross-sectional shape in the axial direction. The cross-sectional shape of the valve portion 3a may be the shape shown in FIG. 4 or another shape.

In the electric control valve constructed as described above, even if the fluid flows from the conduit 1a to the conduit 1b at any rotational position of the shaft portion 3, the conduit 1b to the conduit 1b can be used. 1a, even if the fluid flows toward the pipe 1a, the peripheral surface of the valve portion 3a and the respective conduits 1a, 1
Since the gaps formed by the valve port portions 1c and 1c 'of b are the same, the fluid flows from the pipeline 1a to the pipeline 1b and the fluid flows from the pipeline 1b to the pipeline 1a. , The flow rates are the same. That is, it is possible to provide an electric control valve that can obtain the same flow rate even if the fluid flow direction changes bidirectionally.

Next, similar to the above-mentioned first embodiment, a reference example of an electric control valve capable of obtaining the same flow rate even if the flow direction of the fluid changes bidirectionally will be shown.

FIG. 9 is a sectional view of a reference example of a bidirectional electric control valve, and FIG. 10 is a IV-I of FIG.
It is a V line sectional view. In this reference example , the conduits 1a and 1b are arranged at positions facing each other with the valve chamber 20 interposed therebetween, and the respective conduits 1a and 1b communicate with the valve chamber 20 via the valve port portions 1c and 1c '. There is.

As shown in FIG. 10, the sectional shape of the valve portion 3a is a shape in which two spirals shown in FIG. 8 are superposed, and the valve portion 3a has the same sectional shape in the axial direction. The valve portion 3a
The cross-sectional shape of can be any other shape as long as it is point-symmetric with respect to the center O.

In the electric control valve constructed as described above, even if the fluid flows from the pipe line 1a to the pipe line 1b at any rotational position of the shaft portion 3, the pipe line 1b to the pipe line 1b is used. 1a, even if the fluid flows toward the pipe 1a, the peripheral surface of the valve portion 3a and the respective conduits 1a, 1
Since the gaps formed by the valve port portions 1c and 1c 'of b are the same, the fluid flows from the pipeline 1a to the pipeline 1b and the fluid flows from the pipeline 1b to the pipeline 1a. , The flow rates are the same. That is, it is possible to provide an electric control valve that can obtain the same flow rate even if the fluid flow direction changes bidirectionally.

Next, an embodiment of the electric control valve according to the present invention in which the configurations of the shaft portion 3 and the rotor 9 are changed will be described with reference to FIGS. 11 to 13.

FIG. 11A is a sectional view of the shaft portion 3. The shaft portion 3 has a valve portion 3a formed in the lower portion and step portions 3g and 3f formed in the upper portion. This step 3
A portion 3c between g and 3f is an engaging portion 3c that comes into contact with the engaging hole 9c of the rotor 9, and its sectional shape is as shown in FIG.
As shown in (b), it is formed in a D shape obtained by cutting out a part of a circular cross section.

The portion 3d of the shaft portion 3 above the step portion 3g is formed to have the largest diameter, and the portions 3b and 3e below the step portion 3f have the same diameter except for the valve portion 3a.

On the other hand, the rotor 9 is formed in a cylindrical shape having a vertical cross section as shown in FIG. 12 (a), and an engaging hole 9c is provided in the middle portion of the inner wall thereof. As shown in FIG. 12B, the horizontal cross section of the intermediate portion is obtained by cutting out a part of the cross section of the engaging hole 9c, like the engaging portion 3c of the shaft portion 3 shown in FIG. It is formed in a D-shape.

The shaft portion 3 is inserted into the engagement hole 9c from above the rotor 9 so that the cross section of the engagement portion 3c and the cross section of the engagement hole 9c of the rotor 9 are aligned from the valve portion 3a side. Then, the step portion 3g of the shaft portion 3 comes into contact with the upper surface 9b of the intermediate portion of the rotor 9 to prevent downward movement, and the shaft portion 3 is fitted to the rotor 9.

Although the engaging portion 3c of the shaft portion 3 has a D-shaped cross section in the above embodiment, it may have a rectangular cross section with one corner cut away. is there.

Next, a third embodiment of the electric control valve according to the present invention will be described with reference to FIG.

In this embodiment, the rotor portion 30 is constituted together with the rotor 9 by covering the shaft portion 3 made of stainless steel or the like in the above-mentioned embodiment with the synthetic resin portion 13 such as nylon or PPS (polyphenylene sulfide). Is. Alternatively, the shaft portion 3 of the above embodiment is formed as the synthetic resin portion 13, and a metal mandrel is inserted to reinforce the mechanical strength of the synthetic resin portion 13. It is similar to the control valve.

The reason for adopting the configuration of this embodiment is that in the electric control valve shown in FIG. 1, the shaft portion 3 slides on the guide portion 1g of the main body 1, but the shaft portion 3 is formed of metal or the like. In this case, the sliding surface of the shaft portion 3 is easily worn, and when the sliding surface is worn, the shaft portion may rattle in the guide portion 1g, and the desired flow rate adjustment may not be possible. This is to prevent this. That is,
By covering the sliding portion with synthetic resin, the sliding contact between the synthetic resin portion 13 and the guide portion 1g is made smooth, and abrasion of the synthetic resin portion 13 is prevented.

Therefore, in order to prevent abrasion of the sliding portion of the shaft portion 3, it is sufficient to cover only this sliding portion,
Further, the valve portion 13a can also be made of synthetic resin. However, when the entire shaft portion 3 is molded with synthetic resin,
Since the mechanical strength is poor, the shaft portion 3 is reinforced by the core metal.

[0067]

According to the first aspect of the present invention, since it is not necessary to move the shaft portion having the valve portion in the axial direction of the shaft portion, it is not necessary to use a screw, and the electric structure is simple. A control valve can be provided. Also,
By rotating the rotor one revolution or less, it is possible to control the range from the minimum flow rate to the maximum flow rate, so that it is possible to provide an electrically-operated control valve with good responsiveness. Further, since the peripheral surface of the valve portion moves toward and away from the valve port in the axial direction of the valve port portion, dust and the like are less likely to be caught, and the fluid is not blocked at right angles to the flow direction.
It is possible to provide an electric control valve that is free from eddy current, wear of the valve port portion, vibration of the valve, and corrosion.

Further, according to the invention described in claim 1,
The same flow rate can be obtained even if the fluid flow is switched in both directions.
To provide an electric control valve that can
You can

Further , according to the invention of claim 1, the valve is
Since the section has the same cross section in the axial direction of the shaft section,
It is possible to provide an electric control valve that is easy to manufacture.
it can.

Further, according to the invention described in claim 1 , in the valve of the type in which the valve port communicates with the valve chamber from the direction perpendicular to the axis of the shaft portion, the maximum flow control range can be obtained. Since the load applied to the rotor in the axial direction of the rotor is reduced by the fluid, it is possible to provide an electric control valve that can rotate the rotor with a smaller electromagnetic force. Further, it is possible to provide an electric control valve that facilitates the work of attaching the pipes when the pipes are connected to the valve from the same direction.

[0071]

According to the second aspect of the present invention, a constant flow rate characteristic can be obtained only by incorporating the rotor at a position where the stopper integrally provided on the rotor and the stopper integrally provided on the valve body side do not overlap each other. Since the electric control valve having the above can be provided, it is not necessary to adjust the position of the stopper when assembling the valve. Further, since it is not necessary to adjust the position of the stopper, it is possible to prevent variations in flow rate characteristics between valves of the same type.

According to the third aspect of the present invention, the engagement and positioning of the rotor and the shaft portion are completed simply by inserting the shaft portion into the engagement hole of the rotor. Can be provided.

According to the fourth aspect of the present invention, the rotor and the shaft can be engaged with each other and the rotor and the shaft can be relatively positioned by only inserting the shaft into the engagement hole of the rotor. Therefore, it is possible to provide an electric control valve having good assembly workability.

According to the fifth aspect of the present invention, it is possible to provide an electric control valve having a simple structure and good assembling workability, which does not require the rotor and the shaft portion to be separate parts.

According to the sixth aspect of the present invention, abrasion of the sliding portion of the shaft portion with respect to the valve body side can be prevented, so that an electric control valve having a long life can be provided.

According to the invention of claim 7 , abrasion of the sliding portion of the valve portion with respect to the valve body side can be prevented while ensuring the mechanical strength of the valve portion, so that an electric control valve having a long life is provided. can do.

[Brief description of drawings]

1 is a cross-sectional view of the electric control valve according to a reference example of the present invention.

FIG. 2 is a sectional view taken along line I-I of FIG.

FIG. 3 is a diagram showing an example of a cross-sectional shape of a valve portion of an electric control valve according to a reference example of the present invention.

FIG. 4 is a diagram showing an example of a cross-sectional shape of a valve portion of an electric control valve according to a reference example of the present invention.

FIG. 5 is a diagram showing flow rate characteristics when the cross-sectional shape of the valve portion is the shape shown in FIG.

6 is a diagram showing a flow rate characteristic when the cross-sectional shape of the valve portion is the shape shown in FIG.

FIG. 7 is a first electric control valve according to the present invention.
It is sectional drawing of an Example .

8 is a sectional view taken along line III-III in FIG.

FIG. 9 is a cross-sectional view of a reference example of a bidirectional electric control valve.

10 is a sectional view taken along line IV-IV of FIG.

FIG. 11 (a) is a sectional view of a shaft portion in a second embodiment of the electric control valve according to the present invention,
FIG. 11B is a sectional view taken along the line VV of FIG.

FIG. 12 (a) is a sectional view of a rotor in a second embodiment of the electric control valve according to the present invention, and FIG. 12 (b) is a sectional view taken along line VI-VI of FIG. 12 (a). is there.

FIG. 13 shows a first example of the electric control valve according to the present invention .
It is sectional drawing of a rotor and a shaft part in 2nd Example .

FIG. 14 shows an electric control valve according to the present invention .
It is sectional drawing which shows 3 Example .

FIG. 15 is a sectional view of a conventional electric control valve.

FIG. 16 is a sectional view of a conventional electric control valve.

[Explanation of symbols]

1 valve body 1a pipeline 1b pipeline 1c, 1c 'valve port 3 shafts 3a Valve part 5 Lower lid 6 closed case 7 coils 8 stator 9 rotor 11 permanent magnets 12 spacers 13 Synthetic resin part 20 valve chamber 30 rotor part

Continuation of the front page (56) Reference JP-A-6-147329 (JP, A) JP-A-1-261579 (JP, A) JP-A-1-288678 (JP, A) Actual Kai-hei-1-63880 (JP , U) Actually open 5-42848 (JP, U) Actually open 4-114754 (JP, U) Actually open 63-80384 (JP, U) JP-B 4-68510 (JP, B2) (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16K 31/00-31/05 F16K 5/00-5/22

Claims (7)

(57) [Claims] 1. A rotor portion of a stepping motor is constituted by a rotor having a permanent magnet and a shaft portion which rotates integrally with the rotor,
In an electric control valve in which the rotor section is arranged in a sealed space formed by a valve body and a sealed case, a valve section is formed on the shaft section, and a valve port section is provided on the valve body. The flow rate is controlled by changing the gap formed by the valve port portion and the peripheral surface of the valve portion facing each other by rotating the rotor according to the cross-sectional shape perpendicular to the axis of the shaft portion of the valve portion. Configured to communicate with two pipelines formed in the valve body, respectively
A valve port section is provided, and these two valve port sections are
On the same plane including the axis of the shaft part, two
And the valve portion in the axial direction of the shaft portion.
Any of the above-mentioned shaft portions can be obtained by adopting a configuration having the same cross section.
Even in the rotating position of the
The gap formed by the valve port portion and the peripheral surface of the valve portion.
The electric control valve is characterized in that 2. A stopper provided integrally with the rotor
In addition, a stopper is integrally provided on the valve body side.
Rotation of the rotor with respect to the valve body by
The electric control valve according to claim 1, wherein the electric control valve is limited . 3. Engagement extending in the axial direction of the rotor
By inserting the shaft portion into the hole, the shaft portion
The rotor is rotated integrally with the rotor.
Or the electric control valve described in 2 . 4. A cutting of an insertion portion of the shaft portion into the rotor.
The surface and the cross section of the engagement hole of the rotor are circular cross sections.
Characterized by having a D-shape obtained by cutting out a part
The electric control valve according to claim 3 . 5. The rotor and the shaft portion are made of a plastic material.
The molded product is integrally molded with a gunnette.
Or the electric control valve described in 2 . 6. At least the valve body side of the shaft portion
The sliding part is coated with a synthetic resin.
Or the electric control valve described in 2 . 7. The shaft part is formed of synthetic resin.
A metal core extending in the axial direction of the shaft part inside the shaft part.
The electric control valve according to claim 1 or 2, wherein a rod is inserted .