JP2003097755A - Motor-operated valve and assembling method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor-operated valve of two rotation needle valve type capable of omitting an adjustment process during manufacture, and also to provide assembling method of the valve. SOLUTION: The motor-operated valve is equipped with a shaft 21 having a male screw body 16 for screwing into a female screw body 2 fixed to a case 1, a stopper 6 rotatably fitted to outside a shaft member 23, a cut-and-raised part 6 arranged to a guide 8 mounted on a valve main body 12 to assemble the shaft 21 slidably in the axial direction and unrotatably, and a projection 6b formed at the stopper 6. In a assembling holder 31 whose side face is formed in a U-shape by a upper flange part 32, a lower flange part 33 and a main body part 34 for connecting the both flange parts, by clamping the upper flange part 32 in a step part 2A formed in the female screw body 2 and clamping the lower flange part 33 in a groove 30 formed on the shaft member 23, a valve stem member A and the stopper 6 are assembled while performing vertical positioning.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor-operated valve using a stepping motor as a drive source and a method for assembling the same, and more particularly to a two-rotation needle valve type motor-operated valve having a simplified stopper mechanism and a method for assembling the same. In the present specification, the "motorized valve" means a portion of the stepping motor type motorized valve excluding a fixed portion (stator) such as a coil, that is, a "motorized valve main body".

[0002]

2. Description of the Related Art Conventionally, as a motor-operated expansion valve in a refrigeration cycle, a multi-rotation type (a mode in which a stepping motor is multi-rotated to move a needle from a fully open position to a fully closed position) is well known (Japanese Patent Publication No. -6299)
Is. For example, in the motor-operated valve shown in FIG. 13, first, the rotor 209 is rotated, the needle valve 203 that moves up and down by the rotor 209 is lowered to a desired position, and then the slider 217 is rotated to rotate the rotor 209 and the rotor 209. Similarly, after lowering the casing 206 to a desired position, the case 206 is moved to the rotor 2 with the locking rod 218 in contact with the slider 217.
Put on 09. Then, the case 206 is covered with a jig having a locking portion 219a configured similarly to the stator 208.

In this state, the rotor 209 applies to the coil of the jig a pulse signal having a number of pulses larger than the number of pulses for causing the needle valve 203 to be in the fully opened to fully closed state,
The rotor 209 is rotated in the direction in which the needle valve 203 is closed. As a result, the needle valve 203 closes the valve seat 202a, and the rotor 209 rotates the slider 217 by the locking rod 218 by the number of turns of the spring by the guide ring 216, so that the needle valve 203 closes the valve seat 202a. Rotate. Then, this state becomes the origin of the rotor 209.

Next, a pulse signal having a desired frequency for opening the valve is applied to the coil of the jig. As a result, the rotor 209 rotates in the opposite direction to the above,
The needle valve 203 is separated from the valve seat 202a, and the valve is slightly opened. At this time, the jig is rotated so that the flow rate of the fluid flowing through the valve becomes a preset flow rate. That is, when the jig is rotated while the voltage is being applied to the coil in the jig, the rotor 209 in the case 206 is also rotated together with the jig, and the opening degree of the valve is changed. It becomes the flow rate.

Thus, from the state where the valve opening is at the origin,
The jig is removed from the case 206 after adjusting the flow rate when a pulse signal having a predetermined frequency is applied so as to reach a predetermined flow rate, and the opening of the case 206 and the lower lid 20 are removed.
5 and 5 are fixed by welding. As a result, the locking portion 218a of the stator 208 configured similarly to the jig is attached to the case 20.
6 is engaged with and fixed to the engaging recess 206a of the stator 2,
This is a method in which the relative positional relationship between the rotor 08 and the rotor 209 matches and the opening degree of the valve with respect to the number of pulses is constant.

In the case of the above-mentioned multi-turn type electric valve, the case 206
A spiral guide ring 216 is wound around the mandrel 215 fixed to the shaft 215, and a slider 217 is attached to the spiral guide ring 216.
Is engaged with the slider 217 so that the slider 217 can rotate and move up and down.
The outer end of is engaged with a locking rod 218 erected on the rotor 209. As described above, since the case 206 is provided with the stopper structure and the position of the rotor 209 is determined, the position of the locking rod 218 must be adjusted while rotating the case, which is a drawback that assembly is difficult.

[0007]

The above-mentioned multi-rotation motor-operated valve has the characteristics of good resolution and good controllability, but it requires an adjusting step during assembly, which is disadvantageous in terms of manufacturing cost. There is a problem. The present invention is
The present invention provides an electrically operated valve having the above-mentioned configuration, which can omit an adjusting step during manufacturing, and an assembling method thereof.

[0008]

In order to solve the above-mentioned problems, a motor-operated valve according to the present invention includes a shaft provided with a female screw body fixed to a case and a male screw body screwed to a female screw of the female screw body. A magnet rotor which is fixed to the shaft and constitutes a rotating portion of a stepping motor, a coil spring and a needle valve which are axially slidably and non-rotatably assembled to the shaft,
A valve rod member formed of a needle stopper and a shaft member,
A stopper that is rotatably fitted to the outside of the shaft member of the valve rod member, a guide that is attached to the valve body to assemble the shaft so that the shaft is slidable and non-rotatable, and a guide provided on the guide. In a motor-operated valve having a cut-and-raised portion and a protrusion formed on the stopper, a side surface is formed in a U shape by an upper flange portion, a lower flange portion, and a main body portion connecting both flange portions. A semi-circular cutout formed on the outer edge of the upper flange of the assembly jig is sandwiched by a step formed on the female screw body and formed on the outer edge of the lower flange. An electric valve for assembling the valve rod member and the stopper while vertically positioning by sandwiching the arcuate notch in a groove formed in the shaft member, and a female screw body fixed to the case, A shaft provided with a male screw body screwed into a female screw of a screw portion, a magnet rotor fixed to the shaft and constituting a rotating portion of a stepping motor, and assembled to the shaft so as to be axially slidable and non-rotatable. A valve rod member formed of a coil spring, a needle valve, a needle stopper, and a shaft member, a stopper rotatably fitted to the outside of the valve rod member, and the shaft being slidable and non-rotatable in the axial direction. In a method of assembling a two-rotation needle valve type motor-operated valve comprising a guide attached to a valve body for assembling to a valve body, a cut-and-raised portion provided on the guide, and a protrusion formed on the stopper, A semi-circular arc formed on the outer edge of the upper flange portion of an assembly jig whose side surface is formed in a U shape by the flange portion, the lower flange portion, and the main body portion connecting the both flange portions. By sandwiching the notch in the step formed in the female screw body and the semi-circular notch formed in the outer edge of the lower flange in the groove formed in the shaft member, the vertical direction The method for assembling the motor-operated valve is characterized in that the valve rod member and the stopper are assembled while the positioning is performed.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First, a two-rotation motor-operated valve (a motor-operated valve in which a stepping motor rotates two times to move the needle valve from the fully open position to the fully closed position) as shown in FIGS. 1 to 6 will be described.

This motor-operated valve is incorporated in refrigerating, refrigerating and air-conditioning equipment such as a heat pump type air conditioner and a refrigerator, and is used for controlling the flow rate of the refrigerant. The drive system is a permanent magnet type stepping motor direct drive type. A case having a needle valve as a flow control valve, the case 4, the case 4
Coil 1 for stepping motor disposed outside the
5, a magnet rotor 3 rotatably provided inside the case 4, a first joint 11, a second joint 14, a valve body 12,
The needle valve 10, the valve seat 13, the female screw body 2 attached via the stem 1 above the inside of the case 4, and the male screw 16a screwed to the female screw 2a formed in the cylindrical inner cylindrical portion of the female screw body 2 on the outer periphery. The formed male screw body 16 is provided.

The male screw body 16 is extended downward to form a shaft 21, and the shaft 21 is formed with a second male screw 21a. The shaft member 23 is screwed into the second male screw 21a. A connecting portion 22 for connecting to the magnet rotor 3 is formed above the shaft 21, and the male screw body 16 is integrally connected to the magnet rotor 3 via the connecting portion 22.

As shown in FIG. 2, the stopper 6 is loosely fitted to the outer peripheral portion of the shaft member 23 inside the magnet rotor 3,
Further, it is placed free on the guide 8. The stopper 6 is provided with a cylindrical main body 6a, and a projection 6b having a fan-shaped cross section that can come into contact with the side surface of the protrusion 3b provided on the magnet rotor 3 is provided on the outer peripheral surface of the main body 6a. There is. Further, two step portions 6c and 6d are formed on the lower surface of the main body portion 6a at 180 ° intervals.

As shown in FIG. 3, the magnet rotor 3
Is provided with a cylindrical main body portion 3a having protrusions 3b protruding from the inner peripheral surface thereof. A protrusion 6b engageable with a ridge 3b provided on the inner peripheral surface of the magnet rotor 3 is projected on the stopper 6, and a guide 8 is engaged with the protrusion 6b protruded on the stopper 6. The raised portion 8a is formed.

As shown in FIG. 4, the guide 8 is provided with a cut-and-raised portion 8a as a stopper portion. The cut-and-raised portion 8a is assembled so that the protrusion 6b of the stopper 6 comes into contact with the side surface when the needle valve 10 is fully opened.

As shown in FIG. 6, the shaft member 23 is composed of a prismatic body having a hexagonal outer shape and a circular hollow portion inside,
Female screw 2 that is screwed into male screw 21a in the circular hollow portion inside
3a is formed. On the outer periphery of the shaft member 23, inside,
A cylindrical stopper 6 having a cylindrical hollow portion slidably abutting on the outer peripheral corner of the hexagonal shaft member 23 is loosely fitted. The stopper 6 is provided on the upper surface of the guide 8 in a free state.

The needle valve 10 and the coil spring 7 are attached to the lower portion of the circular hollow portion of the shaft member 23. Since the shaft member 23 is formed of a prismatic body having a hexagonal outer shape, the guide 8 as a guide member for the shaft 23 member has a structure shown in FIG.
As shown in, a hexagonal guide hole 8b is formed.
In this way, the rotation of the shaft member 23 is stopped by forming the outer shape of the shaft member 23 into a hexagonal shape and forming the guide hole 8b of the guide 8 as a guide member of the shaft member 23 into a hexagonal shape. Has become.

In this motor-operated valve, the male screw 16a and the second male screw 21a are engraved with screws having the same pitch and opposite pitch angles (the male screw 16a is the right screw and the male screw 21a is the left screw). In FIG. 1, reference numeral 29 is the valve body 12
2 shows a hemispherical concave dimple, and a bracket 28 having a hemispherical convex portion 28a that can be fitted into the dimple 29 is attached to the stator 27.

Further, when the needle valve 10 closes the valve seat 13a, the coil spring 7 is configured to be crimped, and the coil spring 7, the needle stopper 9, the needle valve 10 and the shaft member 23 are used. A valve rod member A is formed.

In the above structure, when the magnet rotor 3 is rotated in the valve opening direction by energizing the coil 15, the magnet rotor 3 is screwed with the female screw 2a fixed to the upper portion of the case 4, so that the magnet rotor 3 is rotated. It rises together with the coil spring 7, the needle stopper 9, and the needle valve 10.

Since the needle valve 10 has a rotation stop, and the male screw 16a and the second male screw 21a are screws having the same pitch and opposite pitch angles, the valve rod member and the magnet rotor 3 are It rises even in the meantime. Therefore,
The valve lift per one rotation of the magnet rotor 3 is twice as high as that of the motor-operated valve using one male screw.
When the male screw 16a and the second male screw 21a have the same pitch angle and the pitch P1 of the male screw 16a is set to be larger than the pitch P2 of the male screw 21a, the valve lift per one rotation of the magnet rotor 3 becomes P1-P2,
Fine adjustment of the valve lift is possible.

In the valve closed (initialized) state, the cut-and-raised portion (stopper portion) 8a of the guide 8, the fan-shaped projection 6b provided on the stopper 6, and the magnet rotor 3 are provided.
The ridges 3b are in contact with each other. Figure 6
(A) shows the state at this time.

When the magnet rotor 3 is further rotated in the valve opening direction, the stopper 6 is left behind and only the magnet rotor 3 rotates. When the magnet rotor 3 makes about one rotation from the state shown in FIG. 6A, the protrusion 3b of the magnet rotor 3 comes into contact with the fan-shaped protrusion 6b of the stopper 6 from the opposite side. FIG. 6B shows the state at this time.

When the magnet rotor 3 is further rotated in the valve opening direction, the protrusions 3b of the magnet rotor 3 cause the stopper 6 to move.
Since the magnet rotor 3 is in contact with the fan-shaped projection 6b of the guide 6, the magnet rotor 3 rotates while pushing the stopper 6, and the fan-shaped projection 6b of the stopper 6 cuts and raises the guide 8 (stopper part).
It rotates until it comes into contact with 8a, and the rotation stops in this state. FIG. 6C shows the state at this time.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION A method for assembling a motor-operated valve according to the present invention will be described below with reference to the drawings. 7 is a perspective view of an assembly jig in the method of assembling the motor-operated valve, FIG. 8 is an external view showing the third and fourth steps, FIG. 9 is the same sectional view, FIG. 10 is a perspective view showing the fifth step, and FIG. Is a perspective view showing a sixth step, and FIG.
2 is a perspective view showing a seventh step and an eighth step.

The method of assembling the motor-operated valve of this embodiment is as follows.
The following procedure, that is, the first step, the second step, the third step,
The order is ... First, the coil spring 7 and the needle valve 10 are put in the shaft member 23, and then the needle stopper 9 is press-fitted in the shaft member 23 to form the valve rod member A (first step). Stem 1 is pressed into female screw body 2 and caulking 1a
Then, the female screw body 2 and the stem 1 are integrated (second step).

As shown in FIGS. 2 and 3, the stopper 6 is inserted into the magnet rotor 3 so that the inner projection 3b of the magnet rotor 3 and the fan-shaped projection 6b of the stopper 6 are brought into contact with each other. As it is, the valve rod member A is screwed in, the assembly jig 31 is sandwiched between the end surface of the magnet rotor 3 and the groove 30 formed in the shaft member 23, and the magnet rotor 3 and the valve rod member A are positioned (third step).

As shown in FIG. 1, the assembling jig 31 has an upper side flange portion 32, a lower side flange portion 33, and a main body portion 34 connecting the both side flange portions with a side surface of a U-shape. A semi-circular cutout 32a that engages (is sandwiched) with the step portion 2A of the female screw body 2 is formed on the outer end edge of the flange portion 32, and the groove 30 is formed on the outer end edge of the lower flange portion 33. A semi-circular cutout 33a that engages (is sandwiched) with is formed. The lower surface of the semicircular cutout 33 a is formed in a shape that can engage with the hexagonal outer periphery of the shaft member 23.

Next, as shown in FIGS. 2 and 3, the stem 1
The female screw body 2 integrated with the magnet rotor 3 is screwed into the magnet rotor 3, and the assembly jig 31 is sandwiched between the side surface of the magnet rotor 3 and the step portion 2A formed in the female screw body 2.
The drive unit assembly B is formed (fourth step).

As shown in FIG. 10, the drive assembly B is inserted into the valve body 12 so that the stopper portion 8a provided on the guide 8 and the fan-shaped projection 6b of the stopper 6 are aligned (fifth step). .

As shown in FIG. 11, the assembly jig 31 is removed from the state of FIG. 10 (sixth step).

Then, as shown in FIG. 12, the drive unit assembly B is covered with the case 4, and the case 4 and the valve body 12 are welded 33 (seventh step).

Finally, as shown in FIG. 12, the case 4 and the stem 1 are fixed by welding 34, and the assembly of the motor-operated valve (main body) is completed (eighth step). The stator 27 including the coil 15 is attached to the outside of the motor-operated valve (main body) assembled in this way to complete a stepping motor-type motor-operated valve.

A dimple 29 is press-molded on the valve body 12. A bracket 28 having a hemispherical convex portion 28a that can be fitted into the dimple 29 is attached to the stator 27. By covering the valve body 12 with the stator 27 while rotating the stator 27 so that the hemispherical convex portion 28a fits into the concave portion 29a of the dimple 29, the circumferential mounting position of the stator 27 with respect to the valve main body 12 is determined. It is also possible to prevent the stator 27 from coming off.

As described above, according to the assembling method of this embodiment, the semi-circle formed on the outer edge of the upper flange portion 32 of the assembling jig 31 having the U-shaped side shape shown in FIG. By sandwiching the arc-shaped notch 32a in the step portion 2A of the female screw body 2, and by sandwiching the semi-circular arc-shaped notch 33a formed in the outer edge portion of the lower flange portion 33 in the groove 30 formed in the shaft member 23. Since the drive unit is assembled while performing the vertical positioning, the step of adjusting at the time of manufacturing can be omitted, and the assemblability can be improved.

Further, the stopper mechanism is a drive unit assembly B.
Since it is built in and has a simple structure, the assembly process is simpler than that of a conventional case having a stopper mechanism. That is, in the conventional case, since the stopper is aligned while rotating the case, the assembly becomes complicated, but this drawback can be solved by the method of this embodiment.

[0036]

As described above, according to the motor-operated valve assembling method of the present invention, the following effects can be obtained. (1) An assembly jig whose side shape is U-shaped,
The semi-circular notch formed on the outer edge of the upper flange is sandwiched between the stepped portions of the female screw body, and the semi-circular notch formed on the outer edge of the lower flange is used as the shaft member. Since the drive unit is assembled while being positioned in the vertical direction by being used so as to be sandwiched in the formed groove, the step of adjusting at the time of manufacturing can be omitted. (2) By omitting the step of adjusting at the time of manufacturing, it becomes possible to improve the assemblability.

[Brief description of drawings]

FIG. 1 is a sectional view of a motor-operated valve as an assembly object of the present invention.

FIG. 2 is a perspective view of a stopper of the motor-operated valve.

FIG. 3 is a perspective view of a magnet rotor of the motor-operated valve.

FIG. 4 is a perspective view of a guide of the motor-operated valve.

FIG. 5 is a partial cross-sectional view of the motor-operated valve.

6 (A), (B), and (C) are operation explanatory views of the motor-operated valve.

FIG. 7 is a perspective view of an assembly jig in the method of assembling the motor-operated valve according to the embodiment of the present invention.

FIG. 8 is an external view of a motor-operated valve showing third and fourth steps in the method of assembling the motor-operated valve according to the embodiment of the present invention.

FIG. 9 is a sectional view of the same.

FIG. 10 is a perspective view showing the same fifth step.

FIG. 11 is a perspective view showing the sixth step.

FIG. 12 is a perspective view showing a seventh step and an eighth step of the same.

FIG. 13 is a cross-sectional view of a conventional multi-rotation electric control valve.

[Explanation of symbols]

1 stem 2 female screw body 3 magnet rotor 3b convex stripe 4 cases 5 axes 6 stopper 6b protrusion 7 coil spring 8 guides 8a Cut and raised part 9 Needle stopper 10 Needle valve 12 valve body 13 seat 15 coils 16 Male screw body 21 Second male screw body 23 Shaft member 27 Stator 28 bracket 28a Hemispherical convex portion 29 Hemispherical concave dimples on the valve body 12 31 Assembly jig 32 Upper flange 32a semi-circular cutout 33 Lower flange 33a Semicircular cutout 34 Main body (of the assembly jig 31)

Claims (3)

[Claims] 1. A shaft having a female screw body fixed to a case, a male screw body screwed into a female screw of the female screw body, a magnet rotor fixed to the shaft and constituting a rotating portion of a stepping motor, A valve rod member formed of a coil spring, a needle valve, a needle stopper, and a shaft member that is axially slidably and non-rotatably assembled to the shaft, and is rotatably fitted to the outside of the shaft member of the valve rod member. With a combined stopper,
A motor-operated valve comprising a guide attached to a valve body for assembling the shaft so as to be slidable in the axial direction and non-rotatably, a cut-and-raised portion provided on the guide, and a projection formed on the stopper. , A semi-circular arc formed on the outer edge of the upper flange portion of an assembly jig whose side surface is formed in a U shape by the upper flange portion, the lower flange portion, and the main body portion connecting both flange portions. By sandwiching the notch in the step formed in the female screw body and by sandwiching the semi-circular notch formed in the outer edge portion of the lower flange portion in the groove formed in the shaft member, A motor-operated valve, characterized in that the valve rod member and the stopper are assembled while positioning. 2. A shaft provided with a female screw body fixed to a case, a male screw body screwed into a female screw of the female screw portion, a magnet rotor fixed to the shaft and constituting a rotating portion of a stepping motor, A valve rod member formed of a coil spring, a needle valve, a needle stopper, and a shaft member that is axially slidably and non-rotatably assembled to a shaft, and rotatably fitted to the outside of the valve rod member. A stopper, a guide attached to the valve body for assembling the shaft so as to be slidable in the axial direction and non-rotatable, a cut-and-raised portion provided on the guide, and a protrusion formed on the stopper. A method of assembling a two-rotation needle valve type motor-operated valve, comprising: an assembling jig having a U-shaped side surface formed by an upper flange portion, a lower flange portion, and a main body portion connecting both flange portions; The semi-circular cutout formed on the outer edge of the lower flange while sandwiching the semi-circular cutout formed on the outer edge of the upper flange with the step formed on the female screw body. By assembling the valve rod member and the stopper by vertically sandwiching the shaft member in a groove formed in the shaft member, the motor-operated valve assembling method. 3. The method of assembling the motor-operated valve according to claim 2, wherein the coil spring 7 and the needle valve 10 are inserted into the shaft member 23, and then the needle stopper 9 is press-fitted into the shaft member 23 to form the valve rod member A. And a second step of press-fitting the stem 1 into the female screw body 2 to perform caulking 1a to integrate the female screw body 2 and the stem 1, and inserting the stopper 6 into the magnet rotor 3. Then, the inner protrusion 3b of the magnet rotor 3 and the stopper 6
Of the fan-shaped projection 6b in contact with each other, and in this state, the valve rod member A is screwed in, and the end face of the magnet rotor 3 and the groove 30 formed in the shaft member 23 are fitted to the lower side of the assembly jig 31. A third step of positioning the magnet rotor 3 and the valve rod member A by sandwiching a semi-circular cutout formed on the outer edge of the flange portion; and the female screw body integrated with the stem 1. 2 is screwed into the magnet rotor 3 and the magnet rotor 3
And a step 2A formed on the female screw body 2 sandwiches a semi-circular cutout formed on the outer edge of the upper flange portion of the assembly jig 31, and the drive assembly B
And a fan-shaped projection 6b of the stopper 6 provided on a guide 8 attached to the valve body 12 so that the shaft can be slidably and non-rotatably assembled in the axial direction.
A fifth step of inserting the drive unit assembly B into the valve body so as to match the above, a sixth step of removing the assembly jig 31 from the state of the fifth step, and the drive unit assembly in the case 4. It is characterized by comprising a seventh step of covering B and welding 33 the base 4 and the valve body 12 together, and an eighth step of fixing the case 4 and the stem 1 by welding 34. Motor valve assembly method.