KR20120001587A - Motor operated valve - Google Patents

Abstract

PURPOSE: An electric valve is provided to ensure low manufacturing costs due to easy fabrication of a stopper assembly that corresponds to a conventional rotor transfer screw. CONSTITUTION: An electric valve(1) comprises a male screw member(10), a valve body(12), movable stoppers(9a,17), a female screw member(11), and fixed stoppers(11d,11f). The male screw member has male threads(10a) and rotates along with the rotation of a rotor(7) of an electric motor. The valve body is formed in the male screw member and arranged opposite to a valve seat(4). The movable stoppers rotate along with the rotation of the male screw member. The female screw member is formed in the valve body and thread-coupled with the male threads. The fixed stoppers contact the movable stoppers. The male screw member has extended male threads(10y,10z) formed by the extension of the male threads.

Description

Electric valve {MOTOR OPERATED VALVE}

The present invention relates to an electric valve used for controlling the flow rate of a refrigerant in a refrigeration cycle system.

Conventionally, as the said electric valve, For example, patent document 1 has the 1st flow path 152 and the 2nd flow path 153 which communicate with the valve chamber 151, as shown in FIG. The valve body 155 provided with the valve seat 154 in the valve chamber communication part of the flow path 153 and the rod-shaped needle valve 157 which folds to the seat valve seat 156 of the valve body 155. ), A cylindrical sealed case 159, a stator coil 167 disposed outside the sealed case 159, and an energized excitation of the stator coil 167 inside the sealed case 159, A rotor 164 movable in the valve opening and closing direction and having a cylindrical sleeve 162 and a cylindrical permanent magnet 163 fixed to an outer ring 166 by an alicyclic ring 166; And a male thread pipe 161 for opening and closing the needle valve 157 by a screw feeding action by the rotation of the rotor 164, and the lower portion of the sealed case 159. The cover 160, the electric valve 150 is welded fixed to the valve body 155, there has been proposed.

4 and 5 (a), the valve closing regulating stopper 162a protrudes from the lower end of the sleeve 162, and the electric valve 150 is shown in FIGS. 4 and 6. As shown in the figure, the totally closed stopper 158a protrudes from the flange body 158, and at the time of valve closing of the needle valve 157, the valve closing regulating stopper 162a is attached to the totally closed stopper 158a. As shown in FIG. 4, by contacting in the rotational direction, the rotor 164 is further lowered when the valve is closed.

When the lowering of the rotor 164 is performed, the dimension h1 from the lower end 168c of the bush 168 shown in FIG. 5A to the lower end of the valve closing regulating stopper 162a is the female screw 168a. Also, the dimension h2 from the upper end of the male screw tube 161 shown in FIG. 6 (b) to the upper end of the totally closed stopper 158a is defined as an integer multiple of the pitch of the male screw 161a. The contact amount between the valve closing regulation stopper 162a and the totally closed stopper 158a is adjusted to screw pitch / 2.

And when manufacturing the rotor feed screw 170 of the said electric valve 150, as shown in FIG. 6, the metal mold | die device 180 which partitions the shaping cavity 182 of the flange body 158 is shown. ), A key protrusion 181b is formed on the lower mold 181 to the molding recess 181a of the totally closed stopper 158a and the inner bottom surface of the molding cavity 182 which is opened in the center. ) Is provided with a bush attachment hole 181c, and a bottomed tubular set bush 183 which is fixed by twisting the male thread pipe 161 inward to the bush attachment hole 181c of the lower mold 181 is fixed. The key projection 181b and the key groove 183a (the lower end of the set bush 183) are provided so that the thread cutting start end 161b of the male screw 161a corresponds to the molding recess 181a. Position), and the base end attachment portion 161c of the male screw tube 161 is attached in a state of protruding upward from the lower mold 181. Then, the mold apparatus 180 is closed, molten resin is injected into the molding cavity 182, and the male screw tube 161 and the flange body 158 are shown in FIGS. 6B and 6C. The rotor feed screw 170 as described above is manufactured.

[Patent Documents]

Patent Document 1: Japanese Patent No. 3310042

As described above, conventionally, in manufacturing the rotor feed screw 170 having the totally closed stopper 158a, after preparing the set bush 183 and integrating with the male thread pipe 161, the mold apparatus 180 is Since the external thread pipe 161 needs to be insert-molded, there is a problem in manufacturing, which leads to an increase in the manufacturing cost of the electric valve 150.

Accordingly, the present invention has been made in view of the problems in the prior art, and it is possible to easily manufacture an assembly similar or equivalent to the rotor feed screw having a stopper, and to provide an electric valve having a low manufacturing cost. The purpose.

In order to achieve the above object, the present invention has a male screw member, a male screw member that rotates with rotation of a rotor of an electric motor, a valve body provided at the male screw member and disposed to face the valve seat, and the male screw. A movable side stopper which rotates with the rotation of the member, a female screw member provided in the valve body and screwed to the male screw portion, and a fixed screw provided in the female screw member and capable of coming into contact with the movable side stopper. In the electric valve provided with a side stopper, the said external thread member is provided with the extended external thread formation part formed by extending the external thread part which engages with the said internal thread member as it is, and the said movable side stopper leaves the said external external thread formation part. Iii) characterized in that.

Moreover, in the said electric valve, the said extended male thread formation part is formed in the direction of the said valve seat, the said movable side stopper is a fully developed lower stopper, and the said fixed side stopper is a developed upper part. It is characterized by being a stopper.

Further, in the electric valve, the extended male screw forming portion is formed in a direction opposite to the valve seat, the movable side stopper is a fully closed stopper, and the fixed side stopper is a fully closed bottom stopper. It is done.

According to the present invention, the mounting of the movable side stopper can be performed very simply, the configuration of the electric valve can be simplified, the production can be easily performed, and the manufacturing cost of the electric valve can be greatly reduced. have.

Moreover, in the said electric valve, a movable side stopper is fixed by contacting the flat part located in the terminal part of an extension male thread formation part, or the screw terminal part of the extension male thread formation part.

With such a configuration, attachment (fixing) of the movable stopper to the electric valve can be performed easily.

In addition, the present invention has a female screw member, which rotates with the rotation of the rotor of the electric motor, a valve body provided on the female screw member and disposed to face the valve seat, and accompanied by the rotation of the female screw member. In the electric valve provided with the movable side stopper rotated and rotated, the male screw member which is provided in the valve main body, and the female screw member is screwed together, and the fixed side stopper which is provided in the male screw member and can contact the said movable side stopper. And the male screw member has an extended male screw forming portion formed by the male screw portion which is screwed with the female screw member as it is, and the fixed side stopper is retracted from the extending male screw forming portion.

Further, in the electric valve, the extended male screw forming portion is formed in the direction of the valve seat, the movable side stopper is a fully closed stopper, and the fixed side stopper is a fully closed bottom stopper.

According to the present invention, the fixed side stopper can be attached very simply, the configuration of the electric valve can be simplified, and the production can be easily performed, and the manufacturing cost of the electric valve can be greatly reduced. .

Moreover, in the said electric valve, the fixed side stopper is fixed by contacting the flat part located in the end of the said extended male thread forming part, or the screw terminal part of the extended male thread forming part. By such a structure, attachment of the fixed side stopper to the said electric valve can be performed easily.

The present invention is also characterized in that, in each of the above-mentioned electric valves, the movable side stopper and the fixed side stopper are formed on the basis of the thread cutting start positions of the female screws formed on the respective side. With this configuration, the contact amount of each stopper can be appropriately managed and set.

As mentioned above, according to this invention, the assembly etc. which correspond to the conventional rotor feed screw which have a stopper can be manufactured easily, and the electric valve with low manufacturing cost can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows 1st Embodiment of the electric valve which concerns on this invention, (a) is a fully closed view, (b) is a figure which shows a development time.
2 is a cross-sectional view showing a second embodiment of the electric valve according to the present invention, in which (a) is fully closed and (b) is unfolded.
3 is a cross-sectional view showing a third embodiment of the electric valve according to the present invention, in which (a) is fully closed and (b) is unfolded.
4 is a cross-sectional view showing an example of a conventional electric valve.
Fig. 5 is a view showing the rotor center of the electric valve of Fig. 4, (a) is a sectional view, and (b) is a bottom view.
6 is a view for explaining the rotor feed screw and the manufacturing method of the electric valve of Figure 4, (a) is a cross-sectional view for explaining the manufacturing method, (b) is a manufactured rotor feed screw to the valve body Sectional drawing which shows the attached state, (c) is a top view of the rotor feed screw shown to (b).

EMBODIMENT OF THE INVENTION Next, the form for implementing this invention is demonstrated, referring drawings.

FIG. 1: shows 1st Embodiment of the electric valve which concerns on this invention, FIG. 1 (a) shows sectional drawing at the time of full closure, and FIG.

The electric valve 1 includes a valve body 5 including two conduits 2 and 3 and a valve seat 4, a can 6 joined to the valve body 5, and a can. The rotor 7 which is arrange | positioned inside 6, and comprises a part of an electric motor, is fixed to the outer peripheral part of the can 6, and the stator (not shown) which rotates and drives the rotor 7, and the support ring ( 9, the valve shaft holder (male screw member) 10 integrally connected to the rotor 7 via the rotor 7, and the valve shaft holder in which the lower end is press-fitted and fixed to the valve body 5, and the valve shaft 10 is inserted. (Female screw member) 11 and the valve body 12 etc. latched by the lower end part of the valve shaft 10, and the like.

The valve body 5 is formed in a cylindrical shape and includes a valve chamber 5a communicating with two flow paths 2a and 3a formed by two conduits 2 and 3. The valve seat 4 is located between the valve chamber 5a and the flow path 3a, and the electric valve 1 opens and closes by folding the valve body 12 to the valve seat 4.

The can 6 is formed in the cylindrical shape which the lower part opened, the upper part closed, and is joined to the upper part of the valve main body 5. Inside the can 6, main parts such as the rotor 7 are housed.

The rotor 7 is formed in a cylindrical shape and is rotatably disposed inside the can 6. This rotor 7 is integrally connected with the valve shaft 10 via the support ring 9 cut out on the upper part of the valve shaft 10. The support ring 9 is integrally formed so that the fully closed stopper portion (movable side stopper) 9a protrudes toward the upper surface of the valve shaft holder 11. An electric motor (for example, a stepping motor) is comprised by the rotor 7 and the stator fixed to the outer peripheral part of the can 6, and the rotor 7 rotates by electric power feeding to the stator.

In the valve shaft 10, the male screw portion 10a for screwing the female screw portion 11a of the valve shaft holder 11 is engraved with a spiral, and the lower end portion 10c is opened downward. The spring receiving part 10b provided with the ceiling part 10e is formed, and the locking ring 16 of the valve body 12 is caulking by the lower end part 10c. In the spring accommodating part 10b, the damping coil spring 14 which adds the valve body 12 downward through the ball 13 is shrink-mounted.

The extended male thread forming portion 10z is provided adjacent to the male screw portion 10a formed on the valve shaft 10 and further formed in the opposite direction to the valve seat 4 so that the male screw of the male screw portion 10a is continuously and extended as it is. have. In other words . Although the external thread part 10a should just be formed in the range which screw-connects to the internal thread part 11a originally provided in the valve shaft holder 11, in this embodiment, the male thread part 10a further covers the range of the valve seat. It extends so that it may face to the opposite side to (4), and is formed as the extended male thread formation part 10z.

And the support ring 9 provided with the fully closed stopper part 9a is screwed to this extended male thread formation part 10z, and the support ring 9 is then connected by suitable methods, such as adhesion | attachment and welding. It is fixed to the valve shaft 10.

In addition, an extended male thread forming portion 10y is provided adjacent to the male screw portion 10a formed on the valve shaft 10 and further formed so that the male screw of the male screw portion 10a continuously extends as it is in the direction of the valve seat 4. have. That is, as mentioned above, the male screw part 10a should just be formed in the range which originally screwed to the female screw part 11a (that is, the male screw part 10a is a drive screw which drives the valve body 12). In this embodiment, the male screw portion 10a is continuously extended as it is so as to face the valve seat 4 side, and is formed as the extended male screw forming portion 10y.

The stopper 17 (movable side stopper) under development twists the female screw portion 17b to an end portion (extension male screw forming portion 10z) of the valve shaft 10 and extends the male screw portion 10a via the male screw portion 10a. It reaches | attains the formation part 10y and is fixed by making it contact the ceiling part 10e. The stopper 17 under development is only screwed into the extended male thread forming portion 10y to abut on the ceiling portion 10e, and fixing to the valve shaft 10 by adhesion, welding, or the like is unnecessary. That is, even if the screwing of the stopper 17 under deployment has become loose, for example, by the use of the electric valve, the unfolded stopper portion 17a fits with the stopper portion 11f on deployment by the operation in the valve closing direction. Upon reaching the stopper portion 17a, the stopper portion 17a is rotated in the direction of the ceiling portion 10e, and is firmly fixed to the valve shaft 10 again. Of course, the above fixation may be performed.

In addition, the male screw of the extended male screw forming portion 10z may be formed up to the front of the ceiling portion 10e, and the stopper 17 may be fixed in contact with the unfolded portion at the cutting end of the male screw.

The valve shaft holder 11 has a female screw portion 11a engraved in a spiral on the upper portion thereof, and is disposed on the outer circumference of the spring receiving portion 10b at the lower portion of the valve shaft holder 11, and has a lower end portion. 11c opens downward and is provided with the cylindrical subtracting part 11b provided with the ceiling part 11e. The lower end part 11c of the subtracting part 11b is integrally molded with the connection support part 5b of the valve main body 5. The female screw portion 11a of the valve shaft holder 11 and the male screw portion 10a of the valve shaft 10 are screwed together, and the valve shaft 10 guides the inside of the valve shaft holder 11 in the vertical direction. do. Moreover, 11 d of fully closed lower stopper parts (fixed side stopper) are provided in the upper surface of the valve shaft holder 11, and the stopper part (fixed) on the surface of the spring accommodating part 10b side of the ceiling part 11e is fixed. 11 f of side stoppers are provided. On the side surface of the valve shaft holder 11, a equalizing hole 15 is formed to planarize the pressure between the valve chamber 5a and the inside of the can 6.

Here, the three parts of the unfolded stopper 17, the valve shaft holder 11, and the support ring 9 have a common male screw (extension male thread forming portion 10y, male thread portion 10a and extended male thread forming portion ( 10z)), each stopper (development lower stopper part) on the basis of the cutting start position of the female thread formed in each of the stopper 17, the valve shaft holder 11, and the support ring 9 under the deployment thereof. (17a), the formation position of 11 f of upper phase stopper parts, 11 d of fully closed top stopper parts, and 9 A of fully closed top stopper parts (formation position of each stopper part in the rotation direction from the cutting start position of a female thread), and When the height is determined, the contact amount (contact height) of each stopper portion can be appropriately set.

The valve body 12 has a conical part in the lower part, and is formed in the column shape as a whole. The upper part 12a of the valve body 12 is interpolated by the spring accommodating part 10b of the valve shaft 10, and is prevented by the locking ring 16 of the valve shaft 10 to prevent it from falling out.

Next, operation | movement of the electric valve 1 which has the said structure is demonstrated, referring FIG.

When the electric valve 1 is closed, for example, in the state shown in FIG. 1 (b), when the energization of the stator is performed by energizing in one direction, the rotor 7 rotates clockwise as viewed from the top and the valve shaft 10. ), The valve body 12 seats on the valve seat 4, and the electric valve 1 closes the valve.

When the valve body 12 seats on the valve seat 4, the fully closed upper stopper portion 9a does not reach the fully closed lower stopper portion 11d, and the rotor 7 is in a rotatable state. When the rotor 7 rotates clockwise as viewed from the upper side, and the fully closed upper stopper portion 9a abuts against the fully closed lower stopper portion 11d, the rotation of the rotor 7 is forcibly stopped.

In addition, when the valve body 12 seats on the valve seat 4, the movement of the valve body 12 stops, but since the valve shaft 10 lowers further, the coil spring 14 is compressed and the valve body ( 12 is pressed against the valve seat 4, and the operation is finished in the posture shown in Fig. 1A.

On the other hand, in the case of opening the electric valve 1, for example, in the state of FIG. 1 (a), when the energization of the stator is performed in the reverse direction to the above, the rotor 7 rotates counterclockwise when viewed upward. Then, the valve shaft 10 rises, the valve body 12 is separated from the valve seat 4, and the electric valve 1 opens. And when the rotor 7 further rotates and the bottom stopper portion 17a contacts the stopper portion 11f on the development, the rotation of the rotor 7 stops, and the rise of the valve body 12 also stops. do.

As described above, the male screw portion 10a is formed on the valve shaft 10 for screwing into the female screw portion 11a formed on the valve shaft holder 11, but the male screw portion 10a is formed to extend further as it is. Since the stopper 17 and the support ring 9 (total closed stopper portion 9a) are unfolded and fixed to the extended male thread forming portions 10y and 10z, which are the extended portions, the same complicated molding process as before. This becomes unnecessary and has a structure similar to the stopper 17 under deployment, the support ring 9 (upper stopper portion 9a) and the valve shaft 10 and their assemblies (conventional rotor feed screw 170). Article) can be easily manufactured, and the electric valve 1 with low manufacturing cost can be provided.

Next, 2nd Embodiment of the electric valve which concerns on this invention is described, referring FIG. Fig. 2 (a) shows a sectional view when fully closed, and Fig. 2 (b) shows a sectional view when developing.

The electric valve 31 includes a valve body 35 including two conduits 32 and 33 and a valve seat 34, a can 36 joined to the valve body 35, and a can 36. It is disposed inside the rotor 37, which constitutes a part of the electric motor, is fixed to the outer peripheral portion of the can 36, and a stator (not shown) for rotationally driving the rotor 37, integral with the rotor 37 Valve shaft holder (female screw member) 39 in which valve shaft 40 is interposed, a guide bush (male screw member) 43 having a lower end press-fitted to valve body 35, and valve shaft 40 ) And a valve body 42 formed integrally with each other.

The valve body 35 is formed in a cylindrical shape and includes a valve chamber 35a communicating with two flow paths 32a and 33a formed by two conduits 32 and 33. The valve seat 34 is positioned between the valve chamber 35a and the flow path 33a, and the electric valve 31 opens and closes as the valve body 42 is inserted into the valve seat 34.

The can 36 is formed in the cylindrical shape which the lower part opened, the upper part closed, and is joined to the upper part of the valve main body 35 via the joining ring 49. As shown in FIG. Inside the can 36, main parts such as the rotor 37 are housed.

The rotor 37 is formed in a cylindrical shape, is rotatably disposed in the can 36, and is integrally connected with the valve shaft holder 39. The electric motor is comprised by the rotor 37 and the stator fixed to the outer peripheral part of the can 36, and the rotor 37 rotates by electric power feeding to the stator.

The valve shaft 40 is interpolated in the upper portion of the valve shaft holder 39 with a slight gap, and the upper end of the valve shaft 40 is placed on a top surface of the valve shaft holder 39. 41) is press-fitted. The valve shaft 40 is integrally provided with a valve body 42 in the lower portion. Although the clearance is provided in the interpolation part of the valve shaft 40 with respect to the valve shaft holder 39 as mentioned above, the valve shaft 40 is attached to the coil spring 44 accommodated in the valve shaft holder 39 inside. By always being added downward by this, the advancing / removing motion of the valve shaft holder 39 is transmitted to the valve shaft 40 stably.

The valve shaft holder 39 is integrated with the rotor 37 and interpolates the valve shaft 40 at the upper portion. In the valve shaft holder 39, a female thread portion 39a for screwing into the male thread portion 43a of the guide bush 43 is engraved in a spiral, and a fully closed upper stopper portion 39b (movable side stopper) at the lower end thereof. Is undone.

A return spring 46 made of a coil spring is provided on the ceiling surface of the valve shaft holder 39. The return spring 46 abuts against the inner surface of the can 36 when the threaded engagement of the male screw portion 43a of the guide bush 43 and the female screw portion 39a of the valve shaft holder 39 is removed. It acts to return the screwing of the screw parts 39a and 43a.

As for the guide bush 43, the lower end part is press-fitted and fixed to the valve main body 35, and the male thread part 43a which screw-fits to the female thread part 39a of the valve shaft holder 39 near the center part is engraved with a spiral. All. In the side surface of the guide bush 43, a equalizing hole 45 for equalizing the valve chamber 35a with the inside of the can 36 is drilled.

As for the fully closed lower stopper (fixed side stopper) 47, the female screw part 47b is screwed and fixed to the extended male screw formation part 43y of the guide bush 43. That is, the male thread portion 43a is formed in the guide bush 43 for screwing into the female thread portion 39a formed in the valve shaft holder 39. However, the male thread portion 43a is further provided with the valve seat 34. It extends continuously as it is, and the fully closed lower stopper 47 is screwed to this extended part (extension male thread formation part 43y). In other words, the male screw portion 43a may be formed in a range that is originally screwed to the female screw portion 39a. However, in this embodiment, the male screw portion 43a is further extended to the valve seat 34 side. It extends continuously as it is, and it is set as an extension male screw formation part, and the stopper 47 is completely closed by the extension male thread formation part 43y, and the stopper 47 is fixed by contact | abutting with the step part 43e. It is.

The totally closed bottom stopper 47 only exits the extended male thread forming portion 43y, and is not particularly fixed to the valve shaft 40 by adhesion, welding, or the like. That is, even if the exit of the fully closed lower stopper 47 is loose due to the use of the electric valve, the fully closed upper stopper portion 39b abuts against the fully closed lower stopper 47 by the operation in the valve closing direction. The fully closed lower stopper 47 is rotated in the stepped portion 43e direction, and is firmly fixed to the valve shaft 40 again. Of course, the above fixing may be performed.

In addition, the male screw of the extended male screw forming portion 43y may be formed up to the front of the step 43e, and the totally closed lower stopper 47 may be fixed to the part of the cutting end of the male screw in abutting manner.

Here, since the two parts of the fully closed lower stopper 47 and the valve shaft holder 39 are screwed to a common male screw (extension male thread forming portion 43y and male screw portion 43a), the fully closed lower stopper Formation position of each stopper (full stop lower stopper part 47a and full close upper stopper part 39b) on the basis of the cutting start position of the female screw formed in each of the 47 and the valve shaft holder 39 (the cutting start of the female thread). By determining the formation position of each stopper and the height in the rotational direction at the position, the contact amount (height height) of each stopper can be appropriately set.

Next, operation | movement of the electric valve 31 which has the said structure is demonstrated, referring FIG.

When the electric valve 31 is closed, for example, in the state shown in Fig. 2 (b), when the energization of the stator is conducted in one direction, the rotor 37 rotates clockwise as viewed from the top and the valve shaft holder ( 39 and the valve shaft 40 also rotate and lower, and the valve body 42 is inserted into the valve seat 34.

After the valve body 42 is inserted to the predetermined position in the valve seat 34, the rotor 37 is further rotated so that the fully closed stopper portion 39b of the valve shaft holder 39 is completely closed to the stopper portion 47a. In contact with each other, the lowering of the valve shaft holder 39 is forcibly stopped, and the operation ends in the attitude shown in Fig. 2A.

In this example, even when the lowering of the valve shaft holder 39 is forcibly stopped as described above, there is a slight gap between the valve body 42 and the valve seat 34, so that a small amount of fluid flows out. It is. Therefore, even when the valve shaft 40 is most lowered, the lowering is not hindered by the valve seat 34, so that the spring 44 is not compressed even at the lowest position of the valve shaft 40.

On the other hand, in the case of opening the electric valve 31, for example, in the state shown in Fig. 2 (a), when energizing the stator in the reverse direction to the above, the rotor 37 rotates counterclockwise as viewed from the top. At the same time, the valve shaft holder 39 and the valve shaft 40 also increase in rotation, and the valve body 42 is separated from the valve seat 34 so that the electric valve 31 opens.

As described above, the male thread portion 43a is formed in the guide bush 43 for screwing into the female thread portion 39a formed in the valve shaft holder 39. However, the male thread portion 43a is further provided with the valve seat 34. And extended to the extension male screw forming portion 43y, and the totally closed lower stopper 47 is fixed to the extension portion to fix it. The fully closed lower stopper 47 can be easily manufactured with the guide bush 43 and the assembly thereof (the equivalent of the conventional rotor feed screw 170), and the electric valve 31 having a low manufacturing cost can be manufactured. Can provide.

By the way, in the description of FIG. 2, even when the lowering of the valve shaft holder 39 is forcibly stopped, there is a slight gap between the valve body 42 and the valve seat 34, and a small amount of fluid can be discharged. It was supposed to be.

However, the electric valve may be configured such that the valve body 42 abuts the valve seat 34 so that the outflow of fluid is blocked when the valve is closed. In this case, after the valve body 42 contacts the valve seat 34, only the valve shaft holder 39 is further lowered while the spring 44 is compressed, and then the valve shaft holder 39 is joined by the stopper. Rotation is stopped.

Next, a third embodiment of the electric valve according to the present invention will be described with reference to FIG. 3. Fig. 3 (a) shows a sectional view when fully closed, and Fig. 3 (b) shows a sectional view when developing.

This electric valve 51 differs from the electric valve 1 shown in FIG. 1 in the following points. That is, the spring accommodating member 83 is retrofitted between the valve shaft (male screw member) 80 and the valve body 82, and the coil spring 84 is contracted inside the spring accommodating member 83. It mounts and presses the valve body 82 via the cylindrical member 73 formed in convex shape below. In addition, the valve main body 75 is formed in a thin bowl shape, and a valve shaft holder (female screw member) 81 formed of resin is attached to the valve main body 75 by welding or the like through the joining ring 85. The totally closed phase stopper 87 having the totally closed phase stopper portion 87a is cut out on the side surface of the upper end of the valve shaft 80, and is provided on the inner surface of the ceiling portion 81e of the subtracting portion 81b of the valve shaft holder 81. A stopper portion 81f is formed on development, and a totally closed lower stopper portion 81d is formed on the upper end of the valve shaft holder 81. The valve body 82 is prevented from falling off by the locking ring 86 which is press-fitted and fixed to the spring receiving member 83 which is caulked by the lower end part 80b of the valve shaft 80. As shown in FIG. The main component 73, the thin valve body 75, and the resin-molded valve shaft holder 81 are used for the weight reduction of the electric valve 51. FIG.

The valve main body 75 is formed in a round shape that opens upward, and the conduit 53 is connected through the conduit 52 and the valve seat member 54. The valve body 75 includes a valve chamber 75a communicating with two flow paths 52a and 53a formed by two conduits 52 and 53. The valve seat 54a is located in the valve chamber 75a, and the electric valve 51 opens and closes by folding the valve body 82 to the valve seat 54a.

Can 56 has a lower opening. The upper part is formed in a closed cylindrical shape, and is joined to the joining ring 85 at the upper part of the valve body 75. Inside the can 56, main parts such as the rotor 57 are accommodated.

The rotor 57 is formed in a cylindrical shape, and is rotatably disposed in the can 56. This rotor 57 is integrally connected with the valve shaft 80 via the support ring 59 fixed to the upper part of the valve shaft 80. An electric motor (for example, a stepping motor) is comprised by the rotor 57 and the stator fixed to the outer peripheral part of the can 56, and the rotor 57 rotates by electric power feeding to the stator.

Below the support ring 59, the fully closed phase stopper 87 having the fully closed phase stopper portion 87a exits the extended male thread forming portion 80z of the valve shaft 80, and the totally closed phase stopper portion 87a is It protrudes toward the upper surface of the valve shaft holder 81.

In the valve shaft 80, the male screw portion 80a for screwing with the female screw portion 81a of the valve shaft holder 81 is engraved with a spiral, and the subtracting portion 81b opens downward. The extended male thread forming portion 80z is provided adjacent to the male screw portion 80a formed on the valve shaft 80 and further formed so that the male screw of the male screw portion 80a extends in the opposite direction to the valve seat 54a. . That is, the male screw portion 80a may be formed in a range that is originally screwed into the female screw portion 81a provided in the valve shaft holder 81 (that is, the male screw portion 80a drives the valve body 82). In this embodiment, the male screw portion 80a is continuously extended as it is so as to face the side opposite to the valve seat 54a, and is formed as an extension male screw forming portion 80z. And the totally closed phase stopper 87 (movable side stopper) provided with the fully closed phase stopper part 87a is extended to this extended male thread formation part 80z.

The totally closed upper stopper 87 is screwed to the extended male thread forming portion 80z and abuts against the lower surface of the support ring 59, and is particularly bonded or welded to the valve shaft 80 or the support ring 59. It is not necessary to fix it by the back. That is, even if the screwing of the fully closed phase stopper 87 becomes loose, for example by use of the said electric valve 51, by the operation | movement of the valve closing direction, the fully closed phase stopper part 87a will be fully closed bottom stopper part 81d. In contact with, the fully closed upper stopper 87 is rotated in the direction of the lower surface of the support ring 59, and is firmly fixed to the valve shaft 80 again. Of course, the above fixation may be performed.

In addition, the extended male thread forming portion 80y is provided adjacent to the male screw portion 80a formed on the valve shaft 80 and further formed so that the male screw of the male screw portion 80a extends in the direction of the valve seat 54a. have. That is, as mentioned above, although the male screw part 80a should be originally formed in the range which is screw-coupled with the female screw part 81a, in this embodiment, the male thread part 80a has the valve seat ( It extends as it is toward 54a) side, and is formed as extended male thread formation part 80y.

The spring accommodating member 83 is caulked and fixed to the lower end part 80b of the valve shaft 80, and the coil spring 84 is contracted and fitted between the spring accommodating member 83 and the main cylindrical member 73.

The stopper 67 (movable side stopper) under development twists the female screw portion 67b to an end portion (extension male screw forming portion 80z) of the valve shaft 80, and extends the male screw portion 80a via the male screw portion 80a. It reaches to the formation part 80y, and is fixed by making it contact the ceiling part 83a of the spring accommodating member 83. FIG. The stopper 67 under development is screwed to the extended male thread forming portion 80y and abuts against the ceiling portion 83a of the spring accommodating member 83 to the valve shaft 80 and the screw accommodating member 83. In particular, fixing by adhesion, welding, or the like is unnecessary. In other words, even when the screwing of the stopper 67 under deployment is loosened by the use of the electric valve 51, the stopper portion 67a under deployment is operated by the operation in the valve closing direction. In contact with the stopper 67, the stopper 67 is rotated in the direction of the ceiling portion 83a of the spring receiving member 83, and is firmly fixed to the valve shaft 80 again. Of course, the above fixing may be performed.

In addition, the male screw of the extended male screw forming portion 80y may be formed up to the front of the ceiling portion 83a, and the bottom stopper 67 may be fixed in contact with the portion of the raised end of the male screw.

The female shaft portion 81a is engraved in a spiral on the upper portion of the valve shaft holder 81, and is disposed on the outer circumference of the spring receiving member 83 at the lower portion of the valve shaft holder 81, and the lower end portion 81c is disposed. It opens downward and is provided with the cylindrical subtracting part 81b provided with the ceiling part 81e. The lower end portion 81c of the subtracting portion 81b is integrally formed with the joining ring 85. The female screw portion 81a of the valve shaft holder 81 and the male screw portion 80a of the valve shaft 80 are screwed together, and the valve shaft 80 guides the inside of the valve shaft holder 81 in the vertical direction. do. Moreover, 81 d of fully closed lower stopper parts (fixed side stopper) are provided in the upper surface of the valve shaft holder 81, and the stopper part (fixed) on the surface of the spring receiving member 83 side of the ceiling part 81e is fixed. 81 f of side stoppers are provided.

Here, the three components of the unfolded lower stopper 67, the valve shaft holder 81, and the fully closed upper stopper 87 have a common male screw (extension male thread forming portion 80y, male thread portion 80a, and extended male thread forming portion). (80z), the respective stoppers (development lower) on the basis of the cutting start positions of the female threads formed on each of the stopper 67, the valve shaft holder 81, and the fully closed upper stopper 87 at the bottom thereof. Formation position (formation of each stopper part in the rotation direction from the cutting start position of a female thread) of the stopper part 67a, the developing stopper part 81f, the fully closed lower stopper part 81d, and the fully closed upper stopper part 87a. Position) and height, the contact amount (contact height) of each stopper portion can be appropriately set.

The valve body 82 has a conical portion at the bottom and is formed in a cylindrical shape as a whole. The upper portion 82a of the valve body 82 is inserted into the spring receiving member 83 and is prevented from slipping out by the locking ring 86.

Next, operation | movement of the electric valve 51 which has the said structure is demonstrated, referring FIG.

When the electric valve 51 is closed, for example, in the state shown in FIG. 3 (b), when energizing the stator in one direction, the rotor 57 rotates clockwise as viewed from the top and the valve shaft 80. ), The valve body 82 seats on the valve seat 54a, and the electric valve 51 closes the valve.

When the valve body 82 seats on the valve seat 54a, the fully closed upper stopper portion 87a does not reach the fully closed lower stopper portion 81d, and the rotor 57 is in a rotatable state. When the rotor 57 is rotated in the clockwise direction from the top, and the fully closed stopper portion 87a abuts against the fully closed lower stopper portion 81d, the rotation of the rotor 57 is forcibly stopped.

In addition, when the valve body 82 seats on the valve seat 54a, the movement of the valve body 82 stops, but since the valve shaft 80 further descends, the coil spring 84 is compressed and the valve body ( 82 is pressed against the valve seat 54a, and operation is complete | finished in the attitude shown to Fig.3 (a).

On the other hand, in the case of opening the electric valve 51, for example, in the state shown in Fig. 3 (a), when energizing the stator in the reverse direction to the above, the rotor 57 rotates in a counterclockwise direction when viewed upward. Then, the valve shaft 80 is raised, the valve body 82 is separated from the valve seat 54a, and the electric valve 51 opens. Then, when the rotor 57 further rotates and the deployed stopper portion 67a abuts against the stopper portion 81f on deployment, the rotation of the rotor 57 stops, and the rise of the valve body 82 is also stopped. do.

As described above, the male screw portion 80a is formed on the valve shaft 80 so as to be screwed to the female screw portion 81a formed on the valve shaft holder 81, but the male screw portion 80a is further extended as it is. Then, the lower stopper 67 (development lower stopper portion 67a) and the totally closed upper stopper 87 (total closed upper stopper portion 87a) are extended and fixed to the extended male thread forming portions 80y and 80z. As a result, a complicated molding process as in the prior art becomes unnecessary, and a structure similar to that of the unfolding stopper 67, the totally closed stopper 87 and the valve shaft 80, and their assemblies (conventional rotor feed screw 170) Can be easily manufactured, and the electric valve 51 with low manufacturing cost can be provided.

1: electric valve 2: conduit
2a: Euro 3: Conduit
3a: Euro 4: Valve seat
5: valve body 5a: valve chamber
5b: connection support 6: can
7: rotor 9: support ring
9a: Totally closed stopper part (movable side stopper) 10: Valve shaft (male screw member)
10a: male thread portion 10b: spring receiving portion
10c: lower part 10e: ceiling part
10y: extension male thread formation part 10z: extension male thread formation part
11: valve shaft holder (female thread member) 11a: female thread portion
11b: subtractive part 11c: lower part
11d: Totally closed stopper part (fixed side stopper) 11e: Ceiling part
11f: Stopper part on expansion (fixed side stopper) 12: Valve body
12a: upper part 13: ball
14 coil spring 15 equalization hole
16: locking ring
17: unfolding stopper (movable side stopper) 17a: unfolding stopper part
17b: female thread part 31: electric valve
32: conduit 32a: euro
33: conduit 33a: euro
34: valve seat 35: valve body
35a: valve chamber 36: can
37 rotor 39 valve shaft holder (female screw member)
39a: female thread
39b: Totally closed stopper part (movable side stopper) 40: Valve shaft
41 nut 42 valve body
43: guide bush (male screw member) 43a: male screw portion
43e: stepped portion 43y: extended male thread forming portion
44: coil spring 45: equalization hole
46: return spring
47: Totally closed lower stopper (fixed side stopper) 47a: Totally closed lower stopper part
47b: female thread part 49: joining ring
51: electric valve 52: conduit
52a: Euro 53: conduit
53a: flow path 54: valve seat member
54a: valve seat 56: can
57: rotor 59: support ring
67: unfolding bottom stopper
67a: Stopper part under unfolding (movable side stopper) 67b: Female thread part
73: cylinder shape member 75: valve body
75a: valve chamber 80: valve shaft (male screw member)
80a: Male thread portion 80b: Lower portion
80y: extended male thread forming portion 80z: extended male thread forming portion
81: valve shaft holder (female thread member) 81a: female thread portion
81b: subtractive portion 81c: T end
81d: Totally closed stopper part (fixed side stopper) 81e: Ceiling part
81f: Expanded stopper part (fixed side stopper) 82: Valve body
82a: upper part 83: spring receiving member
83a: ceiling 84: coil spring
85: bonding ring 86: locking ring
87: totally closed stopper
87a: Totally closed stopper part (movable side stopper)

Claims (8)

A male screw member having a male thread portion and rotating with the rotation of the rotor of the electric motor;
A valve body provided on the male screw member and disposed to face the valve seat;
A movable side stopper which rotates with rotation of the male screw member,
A female screw member provided in the valve body and screwed to the male screw portion;
In the electric valve provided in the female screw member, and provided with a fixed side stopper that can contact the movable side stopper,
The male screw member includes an extended male screw forming portion formed by extending a male screw portion which is screwed with the female screw member as it is,
And the movable side stopper is extended to the extended male thread forming portion. The method of claim 1,
The extended male thread forming portion is formed in the direction of the valve seat,
The movable side stopper is an unfolding stopper,
The fixed-side stopper is an electric valve, characterized in that the stopper on deployment, The method of claim 1,
The extended male thread forming portion is formed in a direction opposite to the valve seat,
The movable side stopper is a fully closed stopper,
The fixed-side stopper is a fully closed lower stopper, 4. The method according to any one of claims 1 to 3,
And the movable side stopper is fixed by abutting a flat portion positioned at the end of the extended male thread forming portion or a screw end of the extended male thread forming portion. A female screw member having a female screw portion and rotating with the rotation of the rotor of the electric motor;
A valve body provided in the female screw member and disposed to face the valve seat;
A movable side stopper which rotates with the rotation of the female screw member,
A male screw member provided in the valve body and screwed to the female screw portion;
In the electric valve provided in the male screw member and provided with the fixed side stopper which can contact the said movable side stopper,
The male screw member includes an extended male screw forming portion formed by extending a male screw portion which is screwed with the female screw member as it is,
And said fixed side stopper is extended to said extended male thread forming portion. 6. The method of claim 5,
The extended male thread forming portion is formed in the direction of the valve seat,
The movable side stopper is a fully closed stopper,
The fixed-side stopper is a fully closed lower stopper. The method according to claim 5 or 6,
And the fixed side stopper is fixed by contacting a flat portion positioned at the end of the extended male thread forming portion or a screw end of the extended male thread forming portion. The method according to any one of claims 1 to 7,
And the movable side stopper and the fixed side stopper are formed on the basis of the screw cutting start positions of the female threads formed on the respective ones.

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