JP3877478B2 - Valve drive device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a valve driving device that opens and closes a flow path by driving a valve body formed of a sphere or the like by a driving source such as a motor.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, electromagnetic valves (see Japanese Patent Application Laid-Open No. Sho 62-288780) and needle valves have been used as devices for opening and closing a refrigerant flow path or the like in a refrigerator or an air conditioner to control the temperature of a chamber communicating with the flow path. There is a valve drive device that uses as a switching valve. Among these, the valve driving device using the electromagnetic valve has a configuration in which either the open or closed state is maintained by keeping the electromagnetic valve energized, and the valve driving using the other needle is performed. The device uses, for example, a stepping motor as a drive source, and has a configuration that opens and closes the flow path by changing the rotational force of the stepping motor to the thrust force of the needle valve. There is an advantage that there are few.
[0003]
In such a valve drive device, the inflow pipe and the outflow pipe are respectively connected so as to open into the internal space of the main body case having an airtight inner space, and the inside of the main body case is passed through the inflow pipe and the outflow pipe. Fluid is allowed to flow into and out of the space. 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]
[Problems to be solved by the invention]
However, if 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 is conducted to the stator of the motor, particularly the coil portion that is sensitive to heat. The parts may be damaged.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a valve drive device that can easily and satisfactorily assemble a main body case and connect an inflow pipe and an outflow pipe.
[0006]
[Means for Solving the Problems]
In order to achieve such an object, according to the present invention, a main body case having an airtight inner space is connected to the inner space of the main body case so as to open and flow fluid into and out of the inner space of the main body case. An inflow pipe and an outflow pipe to be opened, a valve body disposed so as to open and close an opening portion of the inflow pipe and the outflow pipe to the internal space of the main body case, and a drive unit that causes the valve body to open and close. In the valve drive device, the main body case is Almost cup-shaped Made of press-drawn parts The two cases are abutted so as to face each other to form an airtight space, and the inflow pipe and the outflow pipe are connected to one case constituting the main body case. And the body case In one case A fixing bracket is fixed to the outside by press-fitting, and the drive unit is a rotor Part And stator Department and The rotor portion of the motor includes the main body case. The other case of Housed in the above rotor Part Body case including The other case of Is the stator Part It is detachably connected to the side via the fixing bracket.
[0007]
As in the present invention, if the other body case portion is configured to be detachable with respect to the stator side of the motor, it is added to the body case side when the body case is subjected to high temperature treatment such as brazing. In addition, it is possible to make a separated state so that high heat is not conducted to the stator of the motor, particularly a coil portion that is sensitive to heat, and the heat treatment for the main body case is favorably performed.
[0008]
At this time, if the main body case portion is attached and detached using the fixing bracket, the structural positioning of the motor is easily and reliably performed by the mechanical coupling relationship of the fixing bracket.
[0009]
Such an effect of the separation structure on the main body case side is particularly effective when the main body case composed of a plurality of divided bodies is welded and joined as in the present invention.
[0010]
Further, if the positioning with respect to the main body case is performed by the positioning member provided on the fixing bracket as in the present invention, the structural positioning of the motor is easily and reliably performed.
[0011]
Moreover, if the whole apparatus is attached via the fixing plate of the fixing bracket as in the present invention, the attachment and detachment and attachment of the main body case portion can be performed efficiently.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is applied to a refrigerant gas switching valve driving device used in a thermal apparatus will be described in detail with reference to the drawings.
[0013]
The valve drive device 1 according to the embodiment shown in FIG. 1 to FIG. 8 is roughly described in terms of its external configuration. A main body case 2 into which refrigerant gas flows in and out, and a main body case 2 in the main body case 2. It comprises two valve ball bodies 3a and 3b that constitute a valve body that opens and closes so as to switch the refrigerant gas, and a drive unit 4 that opens and closes the two valve ball bodies 3a and 3b.
[0014]
The main body case 2 is formed by abutting a main case 2a and a case cover 2b made of a substantially cup-shaped press-drawn part made of stainless steel (SUS) so as to face each other. 2a and the case cover 2b are joined to each other by a TIG (tungsten inert gas) welded portion T in a state where the flange portions provided in close contact with each other, thereby forming a substantially cylindrical airtight gas storage space. It is made.
[0015]
More specifically, the main case 2a has a flat bottom wall surface 2a1 having a substantially circular shape, and a side wall surface 2a2 raised in an annular shape from the outer peripheral side of the bottom wall surface 2a1, The bottom wall surface 2a1 and the side wall surface 2a2 define a relatively shallow cylindrical space that opens upward in FIG. 1 as the internal space of the main case 2a. The case cover 2b has a substantially cup shape that is longer than the main case 2a. The case cover 2b is raised in a ring shape from a flat bottom wall surface 2b1 having a substantially circular shape and an outer peripheral side of the bottom wall surface 2b1. 1 and is fixed so that the lower end opening in FIG. 1 of the case cover 2b covers the upper end opening of the main case 2a.
[0016]
The bottom wall surface 2a1 of the main case 2a has an inflow pipe 5 for allowing the refrigerant gas to flow into the main body case 2, and two outflow pipes 6a and 6b for allowing the refrigerant gas in the main body case 2 to flow out. Are connected to each other. That is, the main case 2a has three openings in the bottom wall surface 2a1, one of which is connected to the inflow pipe 5, and the refrigerant gas supplied through the inflow pipe 5 is supplied to the main case 2a. It is intended to be taken in. The remaining two openings are for inserting the internal space of the main case 2a and the outflow pipes 6a and 6b, respectively. The refrigerant gas taken into the main case 2a is supplied to the outflow pipes 6a and 6b. It is intended for sending in. As described above, in the present embodiment, the three pipe members 5, 6a, 6b are all connected to the bottom wall surface 2a1 of the main case 2a, and are directed from the bottom wall surface 2a1 in the same direction below the drawing. It is attached so as to extend substantially in parallel. This is because, as described above, the main case 2a is a press product, and pipe connection cannot be achieved unless such a parallel arrangement relationship is obtained.
[0017]
In addition, cylindrical valve joint pipes 7a and 7b each having a refrigerant gas passage hole at the center thereof are fitted into the connecting portion between the two openings in the bottom wall surface 2a1 of the main case 2a and the outflow pipes 6a and 6b. Yes. Each of the valve joint pipes 7a and 7b is formed of an elongated cylindrical member formed of deoxidized steel or oxygen-free steel (C1220, C1020), and penetrates the bottom wall surface 2a1 of the main case 2a. It is attached to the outer surface of the bottom wall surface 2a1 of the main case 2a by a nickel brazing portion N. A portion of each of the valve joint pipes 7a and 7b that protrudes outward (downward in FIG. 1) from the fitting portion into the main case 2a is formed to have a relatively large diameter. The above-described outflow pipes 6a and 6b are respectively inserted and fixed to the inner side of the protruding portion. The large-diameter portions of the valve joint pipes 7a and 7b and the outflow pipes 6a and 6b are also fixed by the nickel brazing portion N.
[0018]
On the other hand, as shown in FIG. 5 in particular, the inflow pipe 5 is directly attached via a burring portion B provided in the main case 2a, but the above-described outflow pipes 6a and 6b are also the same. It is also possible to connect with a simple burring part.
[0019]
As described above, the case cover 2b is made of stainless steel (SUS) and is fixed to the main case 2a made of the same material by a TIG (tungsten inert gas) weld T. In the drive device, the main body case is usually made of brass, and the case cover 2b is made of SUS. Therefore, in order to join both members, it is necessary to braze the joint portion. However, this brazing operation is a manual operation and takes time. Further, when brazing is automatically performed in a hydrogen reduction furnace instead of manual work, there may be a problem that zinc gas is generated from the brass portion and cracks are generated in other welded portions. 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 problems do not occur, and both are performed by TIG welding. The case cover 2b that can be easily integrated and thus joined to the main case 2a forms the main body case 2 for enclosing the refrigerant gas in cooperation with the main case 2a.
[0020]
On the other hand, portions of the valve joint pipes 7a and 7b that protrude toward the inner space of the main case 2a are erected over a predetermined height from the bottom wall surface 2a1 of the main case 2a in the axial direction (upward in FIG. 1). The valve ball bodies 3a and 3b are respectively mounted on the standing opening portions of the valve joint pipes 7a and 7b. Valve openings 7av and 7bv (particularly FIGS. 4, 5 and 7) are formed so that the front end opening portions of the valve joint pipes 7a and 7b have partial spherical shapes corresponding to the outer surfaces of the valve balls 3a and 3b. The valve ball bodies 3a, 3b are placed in close contact with the valve ports 7av, 7bv.
[0021]
In particular, as shown in FIG. 7, the refrigerant gas passage holes 7a1 and 7b1 of the valve joint pipes 7a and 7b have a small diameter enough to ensure the flow rate of the refrigerant gas necessary for the apparatus. However, the refrigerant gas passage holes 7a1 and 7b1 are provided with wax reservoirs 7a2 and 7b2 at the connecting portion between the inflow pipe 5 and the outflow pipe 6a, and the inflow pipe 5 and the outflow pipe 6a. The surplus brazing agent is stored in the brazing part N used for connection to the refrigerant gas to prevent the surplus brazing agent from flowing into the refrigerant gas passage holes 7a1 and 7b1.
[0022]
Further, hook-shaped presser portions 7a3 and 7b3 are formed at substantially central portions in the axial direction on the outer surface sides of the valve joint pipes 7a and 7b, respectively, and the hook-like presser portions 7a3 and 7b3 are shown in FIG. Ends of coil springs 7a4 and 7b4 mounted on the outer peripheral portions of the valve joint pipes 7a and 7b are supported on the upper side surface. The coil springs 7a4 and 7b4 have a length that slightly protrudes from the upper end portions of the valve joint pipes 7a and 7b. The valve ball bodies 3a and 3b are connected to the valve ports 7av and 7bv of the valve joint pipes 7a and 7b. It has a function of energizing to push upward from the top.
[0023]
Furthermore, a guide substrate 2c1 of a guide member 2c made of a pressed product of stainless steel (SUS) is sandwiched between the flange-like presser portions 7a3 and 7b3 of the valve joint pipes 7a and 7b and the main case 2a. Has been. A guide substrate 2c1 in the guide member 2c is disposed so as to be in close contact with the bottom wall surface 2a1 of the main case 2a, and a pair of positions for regulating the position of the valve joint pipes 7a and 7b and the valve ball bodies 3a and 3b described above. Valve support frames 2c2 and 2c3 are erected along the valve joint pipes 7a and 7b.
[0024]
That is, the valve support frames 2c2 and 2c3 are provided so as to rise from the guide substrate 2c1 at a substantially right angle, and are substantially planar planes surrounding the valve joint pipes 7a and 7b and the valve ball bodies 3a and 3b from three directions. It is formed so as to have a letter shape. A pair of U-shaped open portions of the valve support frames 2c2 and 2c3 are disposed so as to face each other toward the center side, and are formed on both wall surfaces of the valve support frames 2c2 and 2c3. On the other hand, when the flange-like presser portions 7a3 and 7b3 of the valve joint pipes 7a and 7b are in contact with each other, the valve joint pipes 7a and 7b are held so as not to be displaced at predetermined positions. The valve ball bodies 3a and 3b are allowed to move within a range of opening and closing movements, which will be described later, in a substantially rectangular inner space defined by the valve support frames 2c2 and 2c3. However, the valve joint pipes 7a and 7b are held so as not to drop out of the valve ports 7av and 7bv.
[0025]
As described later, the opening and closing operation of the valve ball bodies 3a and 3b is performed by the cam member 4a of the drive unit 4 disposed so as to contact the upper side of the valve ball bodies 3a and 3b. In the guide member 2c, the entire cam member 4a is moved upward to the retracted position on the upper side in FIG. 1 to thereby open both the above-described two valve ball bodies 3a and 3b in the open state. In particular, see FIG. 6 and FIG. Further, in the vicinity of the retractable inclination guide portion 2c4, there is provided a rotation stop projection 2c5 that becomes an origin position when the cam member 4a is rotationally moved. The rotation stop projection 2c5 constitutes a reference position lock portion, and a detailed configuration regarding each of these members will be described later.
[0026]
Further, as described above, the guide member 2c is disposed in the internal space of the main case 2a. The guide member 2c is provided with a radial positioning portion that abuts against the inner peripheral wall surface of the main case 2a. It has been. This radial positioning portion is in contact with three or more points on the inner peripheral wall surface of the main case 2a, in this embodiment, over five locations, and more specifically, in the tangential direction from the retracted inclination guide portion 2c4. The first positioning plate 2c6 extends integrally so as to be bent, and the leading end edge portion of the first positioning plate 2c6 is in contact with the inner peripheral surface of the main case 2a. Further, second positioning plates 2c7 and 2c8 protrude from the upper edge portions of the valve support frames 2c2 and 2c3 toward the upper side in FIG. 1, and the width direction of the second positioning plates 2c7 and 2c8 is determined in the width direction. Both end edges of the two are in contact with the inner peripheral surface of the main case 2a. Since the first positioning plate 2c6 and the second positioning plates 2c7 and 2c8 are in contact with the inner peripheral wall surface of the main case 2a, the entire guide member 2c is easily radial with respect to the main case 2a. And it is positioned with high accuracy.
[0027]
At this time, the second positioning plates 2c7 and 2c8 are arranged 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, and the flange portion on the case cover 2b side. On the other hand, it is in an arrangement relationship in contact with the flange portion of the main case 2a.
[0028]
On the other hand, the cam member 4a that constitutes the drive unit 4 includes a first cam member 4a1 that is a disk-shaped member that contacts the valve ball bodies 3a and 3b, and a central side portion of the first cam member 4a1 in FIG. A second cam member 4a2 projecting downward, and a cam surface 4a3 having a predetermined concavo-convex shape is provided on the lower end surface side of the first cam member 4a1. A cam surface 4a4 is provided on the cylindrical peripheral surface portion of the second cam member 4a2. Although the structure of the cam member 4a will be described later, the drive unit 4 includes a stepping motor 4b serving as a drive source for rotationally driving the cam member 4a, and the first and second cams are driven by the stepping motor 4b. By rotating the members 4a1 and 4a2, the valve ball bodies 3a and 3b are configured to open and close within a predetermined range in the main case 2a.
[0029]
The stepping motor 4b includes a stator portion 4b1 around which a coil is wound, a rotor portion 4b2 disposed opposite to the inside of the stator portion 4b1, and a fixed shaft 4b3 into which a rotation center portion of the rotor portion 4b2 is rotatably inserted. And, it has a configuration comprising. When electric 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.
[0030]
The stator portion 4b1 is housed in a stator case 4b5 made of a predetermined resin member. The stator case 4b5 is detachable from the main body case 2 by the engagement / disengagement action of a fixing bracket 4b12 described later. It can be attached to. In the stator portion 4b1, the coil is integrated with the pole teeth of the stator portion 4b1 and sealed with resin.
[0031]
On the other hand, in the rotor part 4b2, a magnet 4b6 is insert-molded in a resin molding material made of PBT (polypropylene terephthalate) so that the magnet 4b6 faces the stator part 4b1 in the radial direction. In addition, the central portion of the rotor portion 4b2 is rotatably attached to the fixed shaft 4b3 serving as the rotation center axis of the first and second cam members 4a1 and 4a2. The rotor portion 4b2 is housed in the internal space of the case cover 2b of the main body case 2 described above, and is spatially isolated from the stator portion 4b1 side by the case cover 2b.
[0032]
The fixed shaft 4b3 through which the rotor portion 4b2 is inserted is erected in an immobile state by being press-fitted and fixed to a substantially central portion of the guide substrate 2c1 of the guide member 2c described above, and the fixed shaft 4b3 1 is inserted into a bearing recess 2b3 formed at the center position of the bottom wall surface 2b1 of the case cover 2b in a loosely fitted state, and the lower end portion of the fixed shaft 4b3 in FIG. It is inserted into a bearing recess 2a3 formed at the center position of the bottom wall surface 2a1 of the case 2a in a loosely fitted state. These two bearing recesses 2b3 and 2a3 are used for positioning the fixed shaft 4b3 during assembly.
[0033]
Further, the upper end surface in FIG. 1 of the rotor portion 4b2 is disposed so as to face the bottom wall surface 2b1 of the case cover 2b in the axial direction, but the upper end surface of the rotor portion 4b2 and the bottom surface of the case cover 2b are arranged. Between the wall surface 2b1, a coil spring 4b7 that urges the entire rotor portion 4b2 toward the main case 2a, which is the lower side of FIG. 1, is mounted in a compressed state. By the urging force of the coil spring 4b7, The rotor portion 4b2 is rotated while being urged toward the main case 2a. That is, when any of the valve joint pipes 7a and 7b described above 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 and 7b. Thus, the rotor portion 4b2 is pushed into the bottom wall surface 2b1 side of the case cover 2b on the upper side of FIG. 1, but the coil spring 4b7 serves as a cushion for pushing back the rotor portion 4b2 at that time.
[0034]
Further, the coil spring 4b7 is pressed against the end surface of the rotor portion 4b2 via a flat washer 4b8, but is pressed against the bottom wall surface 2b1 of the case cover 2b via a bell-shaped washer 4b9. Has been. The bell-shaped washer 4b9 has a flat surface portion 4b10 that comes into contact with the bottom wall surface 2b1 of the case cover 2b, and a cylindrical portion 4b11 that is bent so as to rise integrally from the outer peripheral edge of the flat surface portion 4b10. 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.
[0035]
On the other hand, the first cam member 4a1 and the second cam member 4a2 of the cam member 4a described above are integrally provided on the end surface on the other end side (the lower end side in FIG. 1) of the rotor portion 4b2. The first cam member 4a1 and the second cam member 4a2 are rotated integrally with the rotor portion 4b2 using the stepping motor 4b as a drive source.
[0036]
Of these, the first cam member 4a1 is formed of a thin disk-shaped member, and the center thereof is inserted through the fixed shaft 4b3 in the same manner as the rotor portion 4b2. The cam surface 4a3 provided on the lower end surface in FIG. 1 of the first cam member 4a1 is disposed so as to face the tip surfaces of the above-described cylindrical valve joint pipes 7a and 7b from a position immediately above. The valve ball bodies 3a and 3b for opening and closing the valve joint pipes 7a and 7b are arranged between the cam surface 4a3 of the first cam member 4a1 and the valve joint pipes 7a and 7b.
[0037]
At this time, the pair of valve joint pipes 7a and 7b and the valve ball bodies 3a and 3b are arranged so as to have a substantially symmetrical positional relationship with respect to the axial centers of the first cam member 4a1 and the second cam member 4a2. The pair of valve joint pipes 7a and 7b and the pair of valve ball bodies 3a and 3b are disposed in a region 180 ° opposite to the fixed shaft 4b3. In other words, the pair of valve joint pipes 7a and 7b and the valve ball bodies 3a and 3b are configured in an arrangement relationship having a substantially linear positional relationship.
[0038]
The pair of valve ball bodies 3a and 3b are arranged in a straight line in this way when the pair of valve ball bodies 3a and 3b are opened and closed by a single cam member 4a. This is to ensure that the operation of closing both the pair of valve bodies 3a and 3b is performed even if the camshaft is uneven or the camshaft is somewhat loose. However, if the cam member 4a itself is configured to swing in response to variations in the height of the valve ball bodies 3a and 3b and backlash of the cam shaft, the valve ball bodies 3a and 3b can be mounted as described above. It is not necessary to arrange on a straight line. In this case, as the swing support structure of the cam member 4a, a wide variety of swing support structures can be employed, such as supporting the cam member so as to be swingable with the edge portion as a fulcrum.
[0039]
The cam surface 4a3 of the first cam member 4a1 has a donut shape opposed to the valve joint pipes 7a and 7b. The surface shape of the cam surface 4a3 is such that the valve balls 3a and 3b are valved. The valve ball bodies 3a and 3b are pressed against the valve ports 7av and 7bv at the upper end portions of the joint pipes 7a and 7b, or are opened and closed by being separated from the valve ball bodies 3a and 3b.
[0040]
As described above, the valve ball bodies 3a and 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 the urging members. The valve ball bodies 3a, 3b are urged so as to always come into contact with the cam surface 4a3 side by the urging forces of the coil springs 7a4, 7b4. In particular, the valve joint pipes 7a, 7b are changed from the closed state to the open state. In doing so, the upper biasing force of the coil springs 7a4 and 7b4 is used to separate the valve springs 7a and 7b from each other. Also, with such a configuration, the valve ball bodies 3a and 3b are always in contact with the cam surface 4a3, and the valve ball bodies 3a and 3b are surely aligned with the surface shape of the cam surface 4a3. It is supposed to be operated.
[0041]
On the other hand, the stator portion 4b1 of the stepping motor 4b is disposed on the outer side in the radial direction of the case cover 2b. The stator portion 4b1 is mounted on the main body case 2 while being accommodated in the stator case 4b5. However, the stator case 4b5 and the main body case 2 are detachably attached via a fixing bracket 4b12 having an elastic force fixed to the main case 2a side.
[0042]
More specifically, as shown in FIG. 2 in particular, a mounting hole provided in a fixing bracket 4b12 made of a substantially rectangular thin plate material is press-fitted into the outer peripheral portion of the main case 2a. The fixing bracket 4b12 is fixed in a state where a plurality of elastic pieces 4b13 bent at the opening edge of the mounting hole of the fixing bracket 4b12 are tightened on the outer peripheral surface of the main case 2a. At this time, positioning protrusions 4b14 (see FIG. 1) projecting in the axial direction toward the flange side of the main case 2a are formed in the opening edge of the mounting holes of the fixing bracket 4b12 in the axial direction of the main body case 2. It is provided so as to protrude, and the distal end portion of the positioning projection 4b14 comes into contact with the flange portion of the main case 2a so that axial positioning is performed.
[0043]
On the other hand, a locking claw 4b15 extending from the side edge of the fixing bracket 4b12 so as to be bent in a substantially L shape is provided, and the outer peripheral surface of the stator case 4b5 is provided with the locking claw 4b15. A step portion 4b16 is formed so that the claw 4b15 is hooked, and the stator case 4b5 and the main body case 2 are attached and detached when the locking claw 4b15 engages and disengages from the step portion 4b16. Yes.
[0044]
Thus, the stator case 4b5 in which the stator portion 4b1 is housed in the main case 2a of the main body case 2 via the fixing bracket 4b12 is mounted on the main body case 2. The case cover 2b that has been 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 falls after the locking claw 4b15 of the fixing bracket 4b12 is elastically bent with respect to the stepped portion 4b16 provided in the stator case 4b5. Thus, the stator case 4b5 is held on the main body case 2 side. When the stator case 4b5 is removed from the main body case 2, the stator case 4b5 can be removed by pulling the stator case 4b5 strongly away from the main body case 2. As described above, the stator case 4b5 can be attached to and detached from the main body case 2 with a single touch. Therefore, the stator 4b1, the coil, and the power supply unit 4b4 connected to the stator 4b1 can be maintained. It will be convenient.
[0045]
Further, the fixing bracket 4b12 is provided with a notch 4b17 extending substantially linearly outward from the mounting hole described above, and the fixing bracket 4b12 is connected to the main body case 2. When attaching and detaching, the inflow pipe 5 and the outflow pipes 6a and 6b are inserted / removed through the notch 4b17.
[0046]
Furthermore, a fixing plate 4b18 for attaching the entire valve driving device 1 to, for example, a frame of a refrigerator is provided at one end edge of the fixing bracket 4b12. The fixing plate 4b18 is formed so that the main body portion of the fixing bracket 4b12 is bent at a substantially right angle. The fixing plate 4b18 is fixed to a pair of mounting holes 4b19 and 4b19 provided in the fixing plate 4b18. Attachment is performed by passing a screw or the like.
[0047]
If the main body case 2 is configured to be detachable with respect to the stator 4b1 side of the stepping motor 4b as in the present embodiment, the main body case 2 is subjected to high temperature processing such as brazing. It is possible to separate the high heat applied to the case 2 side so that it is not conducted to the stator 4b1 of the stepping motor 4b, particularly the heat-sensitive coil portion, etc., so that the heat treatment for the main body case 2 is performed well. It has become.
[0048]
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 positioning of the stepping motor 4b is performed by the mechanical coupling relationship of the fixing bracket 4b6. Easy and reliable.
[0049]
Moreover, the effect by such a separation structure on the main body case 2 side is particularly effective when the main body case 2 composed of a plurality of divided bodies is welded and joined as in the present embodiment.
[0050]
Further, if the positioning with respect to the main body case 2 is performed by the positioning member 4b9 provided on the fixing bracket 4b6 as in the present embodiment, the structural positioning of the stepping motor 4b is easily and reliably performed.
[0051]
Moreover, if the whole apparatus is attached via the fixing plate 4b14 of the fixing bracket 4b6 as in the present embodiment, the attachment and detachment and attachment of the main body case 2 portion are efficiently performed. .
[0052]
【The invention's effect】
As in the present invention, if the other body case portion is configured to be detachable with respect to the stator side of the motor, it is added to the body case side when the body case is subjected to high temperature treatment such as brazing. In addition to the above-described effects, the main body case is favorably heat-treated in such a manner that the high heat is not conducted to the stator of the motor, particularly the coil portion that is sensitive to heat.
[0053]
At that time, if the mounting / dismounting of the main body case portion is performed using the fixing bracket, the structural positioning of the motor is easily and reliably performed in addition to the above-described effects by the mechanical coupling relationship of the fixing bracket. .
[0054]
Such an effect of the separation structure on the main body case side is particularly effective when the main body case composed of a plurality of divided bodies is welded and joined as in the present invention.
[0055]
In addition to the above-described effects, the structural positioning of the motor can be easily and reliably performed in addition to the effects described above by positioning the main body case with the positioning member provided on the fixing bracket as in the present invention.
[0056]
Moreover, if the whole apparatus is attached via the fixing plate of the fixing bracket as in the present invention, in addition to the effects described above, the attachment and detachment and attachment of the main body case portion can be performed efficiently. It will be.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a valve drive device according to a first embodiment of the present invention.
FIG. 2 is an explanatory bottom view of the valve drive device of FIG. 1 as viewed from the direction of arrow II.
3 is an explanatory longitudinal cross-sectional view showing an enlarged main body case portion in the valve drive device of FIG. 1; FIG.
4 is an explanatory view of a longitudinal section in which the pipe connection state of the main body case with respect to the main case in the valve drive device of FIG. 1 is enlarged from the front side.
FIG. 5 is an explanatory longitudinal cross-sectional view illustrating an enlarged state of a pipe connection state of a main body case with respect to a main case in the valve driving device of FIG. 1 from a side surface side.
6 is a longitudinal cross-sectional explanatory view showing, in an enlarged manner, a pipe connection state of a main body case with respect to a main case in the valve drive device of FIG. 1; FIG.
FIG. 7 is a longitudinal sectional view illustrating the structure of a valve joint pipe fixed to a main body case.
FIG. 8 is an explanatory side view showing the structure of the guide member fixed to the main body case.
[Explanation of symbols]
1 Valve drive
2 Body case
2a Main case
2b Case cover
2b2, 2a3 Bearing recess
2c Guide member
2c2, 2c3 Valve support frame
2c4 Retreat slope guide
2c5 Protrusion for stopping rotation at origin
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 Lower surface
4a7 Slope
4b Stepping motor
4b1 Stator part
4b2 Rotor part
4b3 fixed shaft
4b4 Stator case
4b5 magnet
4b6 Bracket for fixing
4b7 coil spring
4b9 bell-shaped washer
4b13 Notch
4b14 fixed plate
5 Inflow pipe
6a, 6b Outflow pipe
7a, 7b Valve joint pipe
7av, 7bv Valve port
7a1, 7b1 Refrigerant gas passage hole
7a2, 7b2 wax reservoir
7a3, 7b3 Foot-shaped presser part
7a4, 7b4 coil spring

Claims (4)

A body case having an airtight inner space;
An inflow pipe and an outflow pipe that are connected so as to open to the internal space of the main body case and allow fluid to flow into and out of the internal space of the main body case;
A valve body arranged to open and close the opening to the main body case internal space of the inflow pipe and the outflow pipe;
In a valve drive device comprising a drive unit that opens and closes the valve body,
The main body case is configured to form an airtight space inside by abutting two cases made of a substantially cup-shaped press drawing member so as to face each other,
Its Rutotomoni is connected the inlet pipe in one of the case constituting the main body case and the outflow pipe, the outside of one of the case of the main body case, the fixing bracket is fixed by press-fitting,
The drive part includes a motor having a rotor part and a stator part, and the rotor part of the motor is accommodated in the other case of the main body case,
The other case of the main body case including the rotor part is detachably connected to the stator part side via the fixing bracket.   2. The valve driving device according to claim 1, wherein the main body case is constituted by a plurality of divided bodies joined by welding, and at least one of the plurality of divided bodies is made of a stainless steel material.   2. The valve driving device according to claim 1, wherein the fixing bracket is provided with a positioning member for positioning by contacting a part of the main body case.   The valve driving device according to claim 1, wherein the fixing bracket is provided with a fixing plate for mounting the entire device.

Images