JP2001153255A - Valve driving system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the application even to a three-way and a four-way valve, by eliminating the necessity for complicated and experimental know-how as of thread cutting work or center aligning work for a valve element and an opening, in a simple structure. SOLUTION: A cam member 4a having a cam surface is provided in a drive part 4, a valve element is actuated by the cam surface of this cam member 4a to open/close an opening of a main unit case 2, so that the opening can be opened/closed by the valve elements 3a, 3b by a simple constitution, also a part of the main unit case 2 is constituted capable of mounting/demounting relating to a side of a stator 4b1 of a motor 4b, so that the main unit case can be separated in a manner wherein high temperature treatment of brazing or the like, even in the case it is applied relating to the main unit case 2, is prevented from being transmitted to the stator 4b1 or the like of the motor 4b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a valve driving device for opening and closing a flow path by driving a valve element formed of a sphere or the like by a driving source such as a motor.

[0002]

2. Description of the Related Art As a device for opening and closing a refrigerant flow passage of a refrigerator or an air conditioner and controlling a temperature of a chamber communicating with the flow passage, a solenoid valve (JP-A-62-288780) has been conventionally used. And a valve drive device using a needle valve as an on-off valve. Of these, a valve driving device using an electromagnetic valve has a configuration in which either the open or closed state is maintained by energizing the electromagnetic valve, and the valve driving device using the other needle is used. The device uses, for example, a stepping motor as a drive source, and has a configuration in which the rotational force of the stepping motor is changed to the thrust of a needle valve to open and close the flow path. There is an advantage that there is little.

In such a valve driving device, an inflow pipe and an outflow pipe are connected to each other so as to open to an inner space of a main body case having an airtight inner space, and the main body case is passed through the inflow pipe and the outflow pipe. Fluid is allowed to flow into and out of the internal space of the case. At this time, the main body case is usually assembled by welding, and the inflow pipe and the outflow pipe are connected to the main body case by brazing.

[0004]

However, when the main body case is subjected to a high-temperature treatment such as welding or brazing as described above, the high heat applied to the main body case side causes the motor stator, particularly heat, to heat. It may be conducted to a weak coil part or the like, and may damage each part.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a valve driving device capable of easily and satisfactorily assembling a main body case and connecting an inflow pipe and an outflow pipe.

[0006]

In order to achieve the above object, according to the present invention, there is provided a main body case having an airtight inner space, and a main body case connected to the main body case so as to open to the inner space. An inflow pipe and an outflow pipe for inflow and outflow of a fluid into and from a space, a valve body arranged to open and close an opening of the inflow pipe and the outflow pipe to the internal space of the main body case, and an opening and closing drive to the valve body The main body case is formed of a press drawing member, and a fixing bracket is fixed to the outside of the main body case by press-fitting, and the driving portion includes a rotor And a motor having a stator, a rotor portion of the motor is housed in the main body case, and the main body case including the rotor is fixed to the stator side for the fixing. It is detachably connected through the racket.

As in the present invention, if the other main body case portion is configured to be detachable from the stator side of the motor, the main body case side can be removed when high-temperature processing such as brazing is performed on the main body case. Can be separated so that the high heat applied to the motor is not conducted to the stator of the motor, particularly to the coil portion that is weak to heat, and the heat treatment for the main body case is performed well.

At that time, the attachment and detachment of the body case
If the fixing bracket is used, the structural positioning of the motor can be easily and reliably performed by the mechanical connection of the fixing bracket.

The function and effect of the separation structure on the side of the main body case are particularly effective when the main body case composed of a plurality of divided bodies is welded and joined as in the present invention.

Further, when the positioning member provided on the fixing bracket is used to position the motor relative to the main body case as in the present invention, the structural positioning of the motor can be easily and reliably performed.

Further, if the entire device is mounted via the fixing plate of the fixing bracket as in the present invention, the attachment / detachment / attachment of the main body case portion can be efficiently performed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a valve driving device for switching a refrigerant gas used in a heat appliance will be described in detail with reference to the drawings.

The valve drive device 1 according to the embodiment shown in FIGS. 1 to 8 can be roughly described in terms of its external configuration. The main body case 2 through which refrigerant gas flows in and out, and the main body case 2 2, two valve bulbs 3 constituting a valve element that opens and closes so as to switch the refrigerant gas
a, 3b and a drive unit 4 for opening and closing these two valve bulbs 3a, 3b.

The main body case 2 is made of stainless steel (SU).
S) A main case 2a and a case cover 2b made of a substantially cup-shaped press drawn part formed of a material butted so as to face each other, and the main case 2a and the case cover 2b butt each other. With the flanges provided at the mating part in close contact with each other,
(Tungsten inert gas) By being fixed by the welding portion T, a substantially cylindrical airtight gas storage space is defined.

More specifically, the main case 2a has a flat bottom wall 2a1 having a substantially circular shape and a bottom wall 2a1 having a substantially circular shape.
a1 has a side wall surface 2a2 raised in an annular shape from the outer peripheral side, and the bottom wall surface 2a1 and the side wall surface 2a2 form a relatively shallow cylinder opening upward in FIG. 1 as an internal space of the main case 2a. A shape space is defined. The case cover 2b has a substantially cup-like shape that is longer and narrower than the main case 2a. The case cover 2b has a flat bottom wall surface 2b1 having a substantially circular shape, and is annularly raised from the outer peripheral side of the bottom wall surface 2b1. The case cover 2b is fixed so as to cover the lower end side opening in FIG. 1 of the case cover 2b on the upper end side opening side of the main case 2a.

The bottom wall 2a1 of the main case 2a has an inflow pipe 5 for flowing refrigerant gas into the main body case 2, and two outflow pipes 6a for discharging refrigerant gas in the main body case 2. , 6b are connected to each other.
That is, the main case 2a has three bottom surfaces 2a1.
It has two openings, one of which is connected to the inflow pipe 5 and is for taking the refrigerant gas supplied through the inflow pipe 5 into the main case 2a.
The remaining two openings are for allowing the internal space of the main case 2a and the outflow pipes 6a and 6b to pass therethrough, respectively. The refrigerant gas taken into the main case 2a is supplied to the outflow pipes 6a and 6b. It is for sending. As described above, in the present embodiment, the three pipe members 5, 6a, 6
b are all connected to the bottom wall surface 2a1 of the main case 2a, and are attached from the bottom wall surface 2a1 so as to extend substantially parallel to the same direction below in the figure. This is because the main case 2a is a pressed product as described above, and if such a parallel arrangement is not established, pipe connection cannot be performed.

At the connection between the two openings on the bottom wall 2a1 of the main case 2a and the outflow pipes 6a and 6b, cylindrical valve joint pipes 7a and 7b each having a refrigerant gas passage hole in the center are provided. It is fitted. The valve joint pipes 7a and 7b are made of deoxidized steel or oxygen-free steel (C
1220, C1020), and is formed from an elongated cylindrical member formed from the bottom wall 2 of the main case 2a.
a1 and the main case 2
a is fixed to the outer surface of the bottom wall surface 2a1 by a nickel brazing portion N. Each of these valve joint pipes 7
Portions a and 7b projecting outward (downward in FIG. 1) from the fitting portion of the main case 2a are formed to have a relatively large diameter, and the inside of the large diameter outwardly projecting portion is formed. The outflow pipes 6a and 6b described above are fixed to the sides by being respectively inserted. The large diameter portions of the valve joint pipes 7a and 7b and the outflow pipes 6a and 6b are also fixed by nickel brazing portions N.

On the other hand, as shown in FIG. 5, the inflow pipe 5 is directly attached via a burring portion B provided in the main case 2a. 6b can also be connected by a similar burring portion.

As described above, the case cover 2b is made of stainless steel (SUS), and the main case 2a made of the same material is provided with TIG (tungsten inert gas).
Although fixed by a weld T, the conventional valve drive device for a refrigerant usually has a main body case made of brass and a case cover 2b made of SUS. for that reason,
In order to join both members, it is necessary to braze the joint. However, since this brazing operation is a manual operation, it takes time and effort. Also, if the brazing is performed automatically in the hydrogen reduction furnace instead of manually, there may be a problem that zinc gas is generated from the brass portion and cracks are generated in other welded portions and the like. On the other hand, in the valve drive device 1 of the present embodiment, as described above, since the main case 2a and the case cover 2b are both formed of SUS material, the above-described problem does not occur, and both are formed by TIG welding. Can be easily integrated,
The case cover 2b thus joined to the main case 2a forms the main body case 2 for sealing the refrigerant gas in cooperation with the main case 2a.

On the other hand, portions of the valve joint pipes 7a and 7b projecting toward the inner space side of the main case 2a are axially (upward in FIG. 1) from the bottom wall surface 2a1 of the main case 2a.
The valve bulbs 3a, 3b are respectively placed on the standing end openings of the valve joint pipes 7a, 7b. The valve openings 7av, 7bv (particularly FIGS. 4, 5 and 7) are formed in the upright end openings of the valve joint pipes 7a, 7b so as to form a partial spherical shape corresponding to the outer surface of the valve bulbs 3a, 3b. Is formed, and the valve port 7 is formed.
The valve bulbs 3a and 3b are placed so as to be in close contact with av and 7bv.

Further, as shown in FIG. 7, the refrigerant gas passage holes 7a1, 7b of the valve joint pipes 7a, 7b are particularly shown.
b1 is set to have a small diameter enough to secure the flow rate of the refrigerant gas necessary for the apparatus, and the refrigerant gas passage holes 7a1 and 7b1 have the inlet pipe 5 and the outlet pipe 6a connected thereto. Are provided with brazing portions 7a2 and 7b2 at the connecting portions of the brazing portions. The surplus brazing agent is stored at the brazing portion N used for connection with the inflow pipe 5 and the outflow pipe 6a, and the surplus brazing material is stored. Is prevented from flowing into the refrigerant gas passage holes 7a1 and 7b1.

Further, flange-shaped pressing portions 7a3, 7b3 are formed at substantially the center of the outer surface side of the valve joint pipes 7a, 7b in the axial direction, respectively, and these flange-shaped pressing portions 7a3, 7b3 are formed. 1, the ends of the coil springs 7a4 and 7b4 mounted on the outer peripheral portions of the valve joint pipes 7a and 7b are supported. These coil springs 7a4, 7b4
The valve bulbs 3a, 3b are provided with lengths slightly protruding from the upper end portions of the valve joint pipes 7a, 7b.
It has a function of urging the valve openings 7av and 7bv to push them upward.

Further, the valve joint pipes 7a, 7b
A guide substrate 2c1 of a guide member 2c made of a stamped product of stainless steel (SUS) is sandwiched between the flange-shaped holding portions 7a3, 7b3 of the above and the main case 2a. The guide substrate 2c1 in the guide member 2c is
A pair of valve support frames 2c2, 2c3, which are arranged so as to be in close contact with the bottom wall surface 2a1 of the main case 2a and regulate the positions of the valve joint pipes 7a, 7b and the valve balls 3a, 3b, respectively, It is erected along the joint pipes 7a and 7b.

That is, the two valve support frames 2c2 and 2c3
Is provided so as to rise substantially at a right angle from the guide substrate 2c1, and is formed so as to form a substantially U-shape in a plane surrounding each of the valve joint pipes 7a, 7b and the valve bulbs 3a, 3b from three directions. I have. A pair of U-shaped open portions of each of the valve support frames 2c2 and 2c3 are arranged so as to face each other toward the center side, and are provided on both wall surfaces of the respective valve support frames 2c2 and 2c3. On the other hand, the flange-shaped holding portion 7 of the valve joint pipes 7a and 7b
By contacting a3, 7b3, it is held at a predetermined position so as not to be displaced. Also,
The valve bulbs 3a and 3b are connected to the respective valve support frames 2c2 and 2c.
In the substantially rectangular inner space defined by c3, movement within a range of opening and closing movement as described later is allowed,
The valve joint pipes 7a, 7b are held so as not to fall off from the valve ports 7av, 7bv.

The opening and closing operations of the valve balls 3a and 3b are performed by a cam member 4a of a driving unit 4 arranged to be in contact with the upper side of the valve balls 3a and 3b, as described later. However, the guide member 2c has
The entirety of the cam member 4a is moved upward to the retracted position on the upper side in FIG.
A retractable inclined guide portion 2c4 (see particularly FIGS. 6 and 8) for opening both of 3b is provided. In the vicinity of the evacuation inclined guide portion 2c4, a rotation stopping projection 2c5 serving as an origin position when the cam member 4a rotates.
Is provided. The anti-rotation projection 2c5 constitutes a reference position lock portion, and a detailed configuration of each of these members will be described later.

Further, as described above, the guide member 2c
Is arranged in the internal space of the main case 2a, but the guide member 2c is provided with a radial positioning portion that contacts the inner peripheral wall surface of the main case 2a. The radial positioning portion contacts the inner peripheral wall surface of the main case 2a at three or more points, in this embodiment at five positions, and more specifically, in the tangential direction from the evacuation inclined guide portion 2c4. The first positioning plate 2c6 is integrally extended so as to be bent, and the leading edge portion of the first positioning plate 2c6 on the extension side is the main case 2c.
a is in contact with the inner peripheral surface. In addition, each of the valve support frames 2c
The second positioning plates 2c7, 2c8 project from the upper edges of the second positioning plates 2c7, 2c8 toward the upper side in FIG. It is in contact with the inner peripheral surface of the main case 2a. Since the first positioning plate 2c6 and the second positioning plates 2c7, 2c8 are in contact with the inner peripheral wall surface of the main case 2a, the entire guide member 2c can be easily radially moved with respect to the main case 2a. In addition, the positioning is performed with high precision.

At this time, the second positioning plates 2c7, 2c
c8 is disposed so as to be substantially the same height as the flange portion of the main case 2a connected to the case cover 2b described above. In the same manner as described above, the contact relationship is established.

On the other hand, the cam member 4 constituting the driving section 4
a is a first cam member 4a1 of a disc-shaped member abutting on the valve balls 3a, 3b, and a second cam member protruding downward from FIG. 1 from the center side portion of the first cam member 4a1. 4a2 and the first cam member 4a1
A cam surface 4a3 having a predetermined uneven shape
And the second cam member 4a2
The cam surface 4a4 is provided on the cylindrical peripheral surface portion of. The structure of the cam member 4a will be described later.
Is provided with a stepping motor 4b which is a driving source for rotating and driving the cam member 4a, and the first and second cam members 4a1 and 4a1 are driven by the stepping motor 4b.
4a2, the valve ball 3 is rotated.
a, 3b are configured to open and close within a predetermined range in the main case 2a.

The stepping motor 4b includes a stator portion 4b1 on which a coil is wound, a rotor portion 4b2 disposed inside the stator portion 4b1 and opposed to the stator portion 4b1.
fixed shaft 4b through which the center of rotation of b2 is rotatably inserted
3 is provided. When power is supplied from the power supply unit 4b4 to the coil of the stator unit 4b1, the rotor unit 4b2 rotates about the fixed shaft 4b3 as a rotation center.

The stator portion 4b1 is housed in a stator case 4b5 made of a predetermined resin member.
By the engagement / disengagement action of b12, it can be detachably attached to the main body case 2. The stator 4b1 has a structure in which the coil is integrated with the pole teeth and the like of the stator 4b1 and sealed with resin.

On the other hand, in the rotor section 4b2, P
A magnet 4b6 is insert-molded in a resin molding material composed of BT (polybutylene terephthalate),
The magnet 4b6 is disposed so as to face the stator portion 4b1 in the radial direction,
The central portion of the rotor portion 4b2 is rotatably mounted on a fixed shaft 4b3 serving as a rotation center axis of the first and second cam members 4a1 and 4a2. The rotor portion 4b2 is provided on the case cover 2b of the main body case 2 described above.
And is spatially isolated from the above-described stator portion 4b1 by the case cover 2b.

The fixed shaft 4b3 into which the rotor portion 4b2 is inserted is connected to the guide board 2 of the guide member 2c.
The fixed shaft 4b3 is fixedly press-fitted to a substantially central portion of the case 1 and is fixed in an immovable state. The upper end portion of the fixed shaft 4b3 in FIG. 1 is formed in a center of the bottom wall surface 2b1 of the case cover 2b. The lower end portion of FIG. 1 of the fixed shaft 4b3 is loosely inserted into the bearing recess 2a3 formed at the center of the bottom wall surface 2a1 of the main case 2a. Have been. These two bearing recesses 2b3, 2a3 are used for positioning the fixed shaft 4b3 during assembly.

The upper end surface of the rotor portion 4b2 shown in FIG. 1 is disposed so as to face the bottom wall surface 2b1 of the case cover 2b in the axial direction. The upper end surface of the rotor portion 4b2 and the case cover A coil spring 4b7 for urging the entire rotor portion 4b2 toward the main case 2a, which is the lower side in FIG. 1, between the bottom wall 2b1 and the bottom wall 2b1.
Is mounted in a compressed state, and the rotor portion 4b2 is rotated while being biased toward the main case 2a by the biasing force of the coil spring 4b7. That is, when one of the above-mentioned valve joint pipes 7a, 7b is opened by the action of the cam member 4a, the pressure of the refrigerant gas flowing into the main case 2a through the opened valve joint pipes 7a, 7b. The rotor unit 4
b2 is the bottom wall surface 2b of the case cover 2b which is the upper side in FIG.
Although pushed into the first side, the coil spring 4b7 serves as a cushion that pushes back the rotor portion 4b2 at that time.

Further, the coil spring 4b7 is pressed against the end face of the rotor portion 4b2 via a flat washer 4b8. Is pressed through.
The bell-shaped washer 4b9 includes a flat surface portion 4b10 that abuts on the bottom wall surface 2b1 of the case cover 2b, and a flat surface portion 4b10.
and a cylindrical portion 4b11 bent so as to rise integrally from the outer peripheral edge of the flat surface portion 4b10, and the coil spring 4b7 is pressed against the surface of the flat surface portion 4b10. The cylindrical portion 4b11 of the bell-shaped washer 4b9 is mounted so as to cover the outer side of the coil spring 4b7.

On the other hand, the other end of the rotor portion 4b2 (FIG. 1)
The first cam member 4a1 and the second cam member 4a2 of the above-described cam member 4a are integrally provided on an end surface of the first cam member 4a1 and the second cam member 4a2.
The cam member 4a2 is rotated integrally with the rotor section 4b2 using the stepping motor 4b as a drive source.

The first cam member 4a1 is formed of a thin disk-shaped member, and the center of the first cam member 4a1 is inserted through the fixed shaft 4b3 similarly to the above-described rotor portion 4b2.
The cam surface 4a3 provided on the lower end surface of FIG. 1 of the first cam member 4a1 is connected to the cylindrical valve joint pipe 7 described above.
a, 7b are disposed so as to be opposed to the front end surfaces of the first cam member 4a1 from directly above.
Valve balls 3a, 3b for opening and closing the valve joint pipes 7a, 7b are arranged between a3 and the valve joint pipes 7a, 7b.

At this time, the pair of valve joint pipes 7a,
7b and the valve balls 3a, 3b are connected to the first cam member 4a.
The pair of valve joint pipes 7a, 7b and the pair of valve balls 3a, 3 are arranged so as to be substantially symmetrical with respect to the axial center of the first and second cam members 4a2.
b are each set to 1 around the fixed shaft 4b3.
It is located in the area opposite by 80 °. That is, the pair of valve joint pipes 7a and 7b and the valve ball 3
a and 3b are arranged in a substantially linear relationship.

The reason why the pair of valve balls 3a and 3b are arranged on a straight line in this manner is that when the pair of valve balls 3a and 3b are opened and closed by a single cam member 4a, both valve balls 3a and 3b are opened and closed.
Even if the heights of the a and 3b vary, or the camshaft has some backlash, the pair of valve balls 3a,
This is to ensure that the operation of closing both 3b is performed. However, if the cam member 4a itself is configured to swing in response to variations in the height of the valve balls 3a, 3b and rattling of the cam shaft, the valve balls 3a, 3b are moved as described above. There is no need to arrange them on a straight line. In this case, as the swing support structure of the cam member 4a, various swing support structures can be employed, such as a swingable support of the cam member with the edge portion as a fulcrum.

The cam surface 4a3 of the first cam member 4a1
Has a donut shape opposed to the valve joint pipes 7a and 7b, and the surface shape of the cam surface 4a3 is
A shape in which the valve bulbs 3a, 3b are pressed against the valve ports 7av, 7bv at the upper end portions of the valve joint pipes 7a, 7b, or the valve bulbs 3a, 3b are separated from the valve bulbs 3a, 3b to perform opening and closing operations. Has been made.

As described above, the valve balls 3a, 3b operated by the cam surface 4a3 of the first cam member 4a1
Are pushed upward in FIG. 1 by the urging force of the coil springs 7a4 and 7b4 as urging members, so that each of the valve balls 3a and 3b is
7b4 is always urged to come into contact with the cam surface 4a3 side. In particular, the valve joint pipes 7a, 7b
When the coil spring 7 is moved from the closed state to the open state,
a4, 7b4 by using the upward urging force of the valve joint pipe 7
a, 7b. Further, with such a configuration, the contact of the valve balls 3a, 3b with the cam surface 4a3 is
It is always reliable, and the valve balls 3a, 3b
The operation is surely performed along the surface shape of the cam surface 4a3.

On the other hand, on the radially outer side of the case cover 2b, a stator portion 4b1 of the stepping motor 4b is provided.
The stator portion 4b1 is mounted on the main body case 2 while being accommodated in the stator case 4b5. The stator case 4b5 and the main body case 2 are fixed to the main case 2a side. It is detachably attached via a fixing bracket 4b12 having the elasticity provided.

More specifically, as shown in FIG. 2, a mounting hole provided in a fixing bracket 4b12 made of a substantially rectangular thin plate is provided on the outer peripheral portion of the main case 2a. Press-fitted bracket 4b for fixing
A plurality of elastic pieces 4b13 bent at the opening edges of the twelve mounting holes secure the fixing bracket 4b12 in a state where the outer peripheral surface of the main case 2a is tightened. At this time, a positioning protrusion 4b14 (see FIG. 1) protruding in the axial direction toward the flange portion side of the main case 2a is provided at the opening edge of the mounting hole of the fixing bracket 4b12.
Are provided so as to protrude in the axial direction of the main body case 2, and when the distal end of the positioning projection 4 b 14 abuts on the flange portion of the main case 2 a, axial positioning is performed. ing.

On the other hand, from the side edge of the fixing bracket 4b12, there is provided a locking claw 4b15 extending so as to be bent in a substantially L-shape, and on the outer peripheral surface of the stator case 4b5, A stepped portion 4b16 is formed such that the locking claw 4b15 is hooked. The engagement and disengagement of the locking claw 4b15 with the stepped portion 4b16 allows the stator case 4b5 and the main body case 2 to be detached and attached. It has become.

As described above, the stator part 4 is attached to the main case 2a of the main body case 2 via the fixing bracket 4b12.
The stator case 4b5 accommodating the main case 2a is attached to the main case 2a.
A case cover 2b welded in advance is inserted into the central cavity of the stator case 4b5. The stator case 4b5 is slid in the axial direction of the main body case 2 and a step 4b16 provided on the stator case 4b5.
In contrast, the locking claw 4b15 of the fixing bracket 4b12
Falls after elastically bending. Thus, the stator case 4b5 is held on the main body case 2 side. When removing the stator case 4b5 from the main body case 2, the stator case 4b5 can be detached by strongly pulling the stator case 4b5 away from the main body case 2.
As described above, since the stator case 4b5 can be attached to and detached from the main body case 2 with a single touch, the parts such as the stator part 4b1, the coil, and the power supply part 4b4 connected thereto are required for maintenance. It will be useful.

The fixing bracket 4b12 is provided with a notch 4b17 extending substantially linearly outward in the radial direction from the mounting hole described above. In the case of attaching and detaching to and from the pipe 2, insertion and removal of the inflow pipe 5 and the outflow pipes 6a and 6b are performed through the notch 4b17.

Further, a fixing plate 4b18 for attaching the whole of the valve driving device 1 to a frame of a refrigerator, for example, is provided at one edge of the fixing bracket 4b12. The fixing plate 4b18 is fixed to the fixing bracket 4b.
12 is formed by bending the main body portion at a substantially right angle, and mounting is performed by passing a fixing screw (not shown) through a pair of mounting holes 4b19 provided in the fixing plate 4b18. Done.

As in this embodiment, if the portion of the main body case 2 is configured to be detachable from the stator 4b1 side of the stepping motor 4b, high temperature processing such as brazing is performed on the main body case 2. In this case, the high heat applied to the body case 2 side causes the stator 4 of the stepping motor 4b to rotate.
b1, in particular, it can be in a separated state so as not to be conducted to a heat-sensitive coil portion or the like, so that the heat treatment for the main body case 2 is favorably performed.

At this time, as in the present embodiment, if the attachment / detachment of the main body case 2 is performed using the fixing bracket 4b6, the structural relationship between the stepping motor 4b and the mechanical coupling of the fixing bracket 4b6 is achieved. Positioning is performed easily and reliably.

The operation and effect of the separation structure on the side of the main body case 2 are particularly effective when the main body case 2 composed of a plurality of divided bodies is welded as in this embodiment.

If the positioning member 4b9 provided on the fixing bracket 4b6 is used to position the main body case 2 as in this embodiment, the structural positioning of the stepping motor 4b can be performed easily and reliably. Will be

Further, as in the present embodiment, if the entire apparatus is mounted via the fixing plate 4b14 of the fixing bracket 4b6, the attachment / detachment and attachment of the main body case 2 can be efficiently performed. It will be.

[0052]

According to the present invention, if the other main body case portion is configured to be detachable with respect to the stator side of the motor, the main body case is subjected to high-temperature treatment such as brazing. The high heat applied to the case side can be in a separated state so as not to be conducted to the stator of the motor, in particular, to a coil portion weak to heat, and in addition to the effects described above, the heat treatment for the main body case is performed well. .

At that time, attaching and detaching the main body case portion
If the fixing bracket is used, in addition to the effects described above, the structural positioning of the motor can be easily and reliably performed by the mechanical connection of the fixing bracket.

The function and effect of the separating structure on the main body case side are particularly effective when the main body case composed of a plurality of divided bodies is welded and joined as in the present invention.

If the positioning member provided on the fixing bracket is used to position the main body case as in the present invention, in addition to the above-described effects, the structural positioning of the motor can be easily and reliably performed. Done.

Further, if the entire device is mounted via the fixing plate of the fixing bracket as in the present invention, in addition to the above-described effects, the attachment and detachment and the mounting of the main body case can be efficiently performed. Will be performed.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view of a valve driving device according to a first embodiment of the present invention.

FIG. 2 is an explanatory bottom view of the valve driving device of FIG. 1 as viewed from the direction of arrow II.

FIG. 3 is an explanatory longitudinal sectional view showing a main body case portion in the valve driving device of FIG. 1 in an enlarged manner.

FIG. 4 is an explanatory vertical cross-sectional view illustrating a pipe connection state of a main body case to a main case in the valve driving device of FIG. 1 in an enlarged manner from the front side.

FIG. 5 is an explanatory vertical cross-sectional view illustrating a state in which a pipe of a main body case is connected to a main case in the valve driving device of FIG.

FIG. 6 is an explanatory longitudinal sectional view showing, in an enlarged manner from a plane side, a pipe connection state of a main body case to a main case in the valve driving device of FIG. 1;

FIG. 7 is an explanatory longitudinal sectional view showing a structure of a valve joint pipe fixed to a main body case.

FIG. 8 is an explanatory side view showing a structure of a guide member fixed to the main body case.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve drive device 2 Main body case 2a Main case 2b Case cover 2b2, 2a3 Bearing recess 2c Guide member 2c2, 2c3 Valve support frame 2c4 Evacuation inclined guide part 2c5 Origin rotation stopping projection 2c6 First positioning plate 2c7, 2c8 Second positioning plate 3a, 3b Valve ball 4 Drive unit 4a Cam member 4a1 First cam member 4a2 Second cam member 4a3 Cam surface 4a4 Cam surface 4a5 Projection 4a6 Low surface 4a7 Slope 4b Stepping motor 4b1 Stator 4b3 Rotor 4b4 Stator case 4b5 Magnet 4b6 Fixing bracket 4b7 Coil spring 4b9 Bell-shaped washer 4b13 Notch 4b14 Fixing plate 5 Inflow pipe 6a, 6b Outflow pipe 7a, 7b Valve joint pipe 7av, 7bv Valve port 7a1, 7b1 Passage holes 7a2, 7b2 Brazing portions 7a3, 7b3 Collar-shaped pressing portions 7a4, 7b4 Coil spring

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shingo Tanaka 5329 Shimosuwa-cho, Suwa-gun, Nagano F-term (reference) in Sankyo Seiki Seisakusho Co., Ltd. 3H062 AA02 AA12 AA13 BB31 CC02 EE08 FF41 GG04 GG06 HH04 HH08 HH09 3H106 DA07 DA08 DB34 DC04 DD14 EE35 GA01 GB01 GC23 GC29 JJ08 KK23

Claims (4)

[Claims] A body case having an airtight inner space; an inflow pipe and an outflow pipe connected to the inner space of the body case so as to open and flow fluid into and out of the inner space of the body case; A valve drive device comprising: a valve body arranged to open and close an opening of the inflow pipe and the outflow pipe to the body case internal space; and a drive unit that causes the valve body to open and close. The main body case is formed of a press drawing member, and a fixing bracket is fixed to the outside of the main body case by press-fitting. The driving unit includes a motor having a rotor and a stator, and the rotor unit of the motor includes: It is characterized in that a main body case housed in the main body case and including the rotor is detachably connected to the stator side via the fixing bracket. Characteristic valve drive. 2. The valve driving device according to claim 1, wherein the main body case is composed of a plurality of divided bodies welded and joined, and at least one of the plurality of divided bodies is made of a stainless steel material. 3. The valve driving device according to claim 1, wherein the fixing bracket is provided with a positioning member for performing positioning by contacting a part of a main body case. 4. The valve driving device according to claim 1, wherein the fixing bracket is provided with a fixing plate for mounting the entire device.