KR100404640B1 - A valve driving apparatus - Google Patents

Abstract

The task is to make it suitable for three-way valves or four-way valves without the need for empirical know-how because of its simple structure, which is not complicated for screwing and aligning the center position of the valve body and the opening.

As a means to solve this problem, a cam member 4a having a cam surface is disposed on the driving unit 4, and the valve body is operated by the cam surface of the cam member 4a to open and close the opening of the main body case 2. The simple configuration allows opening and closing of the opening to the valve bodies 3a and 3b, and adopts a press-worked product as the guide member 2c to ensure the pipe connection, and to weld or heat as in the case of using a resin material. The situation in which the guide member melts during high temperature treatment such as treatment can be avoided, and the productivity is greatly improved as compared with the case where the guide member is used as a cut product.

Description

Valve driving device {A VALVE DRIVING APPARATUS}

The present invention relates to an improvement of a valve drive device which drives a valve body composed of a sphere or the like by a drive source such as a motor and opens and closes a flow path.

As a device for opening and closing the flow path of a refrigerant such as a refrigerator or an air conditioner and controlling the temperature of a room passing through the flow path, a solenoid valve (see Japanese Patent Laid-Open No. 62-288780) or a needle valve is conventionally used as an on / off valve. There is a valve driving device used.

However, the valve driving apparatus using the solenoid valve generally has a problem that the sound is large during the opening and closing operation. In addition, even in the open or closed state, it is necessary to keep the solenoid valve energized in order to maintain the state, which causes problems in terms of power consumption. In addition, this solenoid valve driving apparatus has a drawback in that both valves cannot be closed or closed.

On the other hand, a valve driving device using a needle uses a stepping motor or the like as a driving source, and opens and closes the flow path by changing the rotational force of the stepping motor to the thrust of the needle valve. . The valve driving device using the needle valve has a structure in which a screw part is engaged with the outer circumference of the rotational shaft of the motor and the inner circumference of the ordinary member disposed outside the rotational shaft in order to convert the rotational force of the stepping motor into the thrust of the needle valve. Have The rotor of the motor rotates while being screwed to the normal member so that the rotor of the motor makes linear movement in the direction along the normal member. As a result, the needle valve attached to the distal end of the output shaft of the motor is linearly integrated with the output shaft, and the opening and closing of the needle valve is performed using the linear movement of the needle valve.

However, such a valve drive device using a needle valve usually has a one-to-one relationship between a motor and a needle valve, and thus it is not possible to open and close several valve bodies with one motor. That is, the valve drive device using the needle valve is difficult to apply to a three-way valve or a four-way valve having a plurality of flow paths (openings). In such a valve driving apparatus using a needle valve, it is technically difficult to form the above-described ordinary member and each threaded portion of the output shaft. That is, in order for the output shaft of the motor to rotate smoothly with respect to the normal member, the screw groove on the side of the normal member and the screw groove on the side of the output shaft must be processed with high precision. Moreover, the alignment operation of the center position of the needle valve attached to the front-end | tip part of the rotating shaft of a motor, and the center position of the flow path (opening) into which this needle valve is inserted becomes subtle. Therefore, there is also a problem that high-precision design technology and empirical know-how are required in assembling.

Therefore, an object of the present invention is to provide a valve driving apparatus that can be applied to a three-way valve or a four-way valve without the need for complicated and empirical know-how such as screwing or adjusting the center position of the valve body and the opening.

1 is a longitudinal cross-sectional view of a valve driving apparatus according to a first embodiment of the present invention.

Fig. 2 is an explanatory view of the bottom of the valve drive device of Fig. 1 as seen from arrow II;

3 is an enlarged longitudinal cross-sectional view of the main body case in the valve driving apparatus of FIG. 1;

Figure 4 is a longitudinal cross-sectional view showing an enlarged front view of the pipe connection state to the main case of the main body case in the valve drive device of FIG.

Fig. 5 is a longitudinal sectional explanatory view showing an enlarged side view of the pipe connection state of the main body case of the main body case in the valve driving device of Fig. 1;

6 is an explanatory longitudinal sectional view showing the pipe connection state of the main body case of the main body case of the valve driving device of FIG.

Figure 7 is a longitudinal cross-sectional view showing the structure of the valve connecting tube fixed to the main body case.

8 is a side explanatory diagram showing a structure of a guide member fixed to a main body case;

9 is an explanatory bottom view of the cam member in the direction of arrow II in the valve driving device of FIG. 1;

FIG. 10 is a plan perspective view showing a valve switching operation by a cam member in the valve driving apparatus of FIG. 1, (A) is a cam member in the first mode to be the home position, and (B) is the arrow direction from the home position. Cam member in the second mode to be rotated 90 degrees, (C) cam member in the third mode to be rotated 270 degrees in the direction of the arrow from the home position, (D) in the direction of the arrow from the home position The figure shows each cam member in the 4th mode which turns to 180 degree | times.

In order to achieve the above object, the present invention provides a main body case having an airtight inner space, an inlet pipe and an outlet pipe connected to an opening in the inner space of the main body case to inflow and outflow the fluid into the inner space of the main body case; A valve body arranged to open and close an opening of the inflow pipe and the outflow pipe to an inner space of the main body case, a drive unit for opening and closing the valve body, and the inflow pipe, the outflow pipe, and the valve body in the main body case In the valve drive device provided with the guide member arrange | positioned so that regulation may be carried out, the said guide member is comprised from the press-processed goods.

The above-described valve drive device is not a complicated configuration that requires cumbersome work such as screwing or adjusting the center position of the valve body and the opening, but a simple configuration for operating the valve body by rotating the cam member having a cam surface by a drive source. This makes it possible to open the opening to the valve body. Moreover, by arranging several valve bodies and studying the shape of a cam surface slightly, this apparatus can also be applied to the three-way valve apparatus or four-way valve apparatus corresponding to several outflow pipes.

In particular, in the present invention, since the press-worked product is used as the guide member, the pipe connection is reliably performed by using the guide member, and the guide member is melted during high temperature treatment such as welding or heat treatment, as in the case of using a resin material. The situation can be avoided. In addition, the productivity is significantly improved as compared with the case where the guide member is used as a cut product.

In addition, by fixing the guide member made of a press-worked product using a valve connecting tube fixed to the main body case as in the present invention, the inlet and outlet pipes can be easily fixed by soldering or the like, and the guide members can be simultaneously fixed. As a result, a simple and reliable fixing structure can be obtained.

In this case, when the guide member and the main body case made of the press-worked product are soldered through the valve connecting pipe as in the present invention, a simpler fixing structure can be obtained.

In addition, if the home position detection of the drive unit is performed by the rotation stop unit disposed in the guide member as in the present invention, the initial positioning can be performed with a simple configuration without using a sensor or the like.

In addition, as in the present invention, the fixing structure of the driving unit is simplified by supporting the motor shaft as the driving unit by using the guide member.

In addition, as in the present invention, when a plurality of valve bodies are opened and closed by a single cam member, the pair of valve bodies are arranged in a substantially straight line, so that a pair of valve bodies may be unbalanced in height of each other or a slight rattling on the cam shaft. The operation of closing the valve body together can reliably be performed with a simple configuration, thereby preventing the leakage of the fluid.

In addition, when the valve connecting pipe is positioned using the guide member as in the present invention, the attachment work of the valve connecting pipe is easily and surely performed.

Further, as in the present invention, when the guide member is brought into contact with the main body case in three or more positions in the radial direction, the guide member is easily and reliably attached.

In addition, if the positional relationship is defined in the axial direction between the guide member and the main body case as in the present invention, the guide member can be completely fixed, and in the case of poor assembly of the guide member, the divisions of the main body case do not match each other. As a result, poor assembly of the guide member is immediately detected.

Moreover, if the side part of the valve body which consists of spheres is regulated with a guide member like this invention, positioning of a valve body will be performed favorably with a simple structure.

In addition, if the evacuation inclination guide portion for guiding the cam member to guide all the valve body to the open state is arranged in the guide member, the high temperature is transmitted from the inlet and outlet pipes during assembly, so that the cam member is inflowed and outflowed. By evacuating away from the observation and thermally interrupting through the air layer, it is difficult to conduct high heat to the cam member side, and melting of the cam member and the like is prevented. In addition, all the valve bodies can be opened immediately even when the air inside the main body case is discharged to put the fluid into the main body case.

In addition, if the control spring is mounted to the coil spring as in the present invention, for example, even if the shaft member does not penetrate the seat, the seat is not detached from the coil spring. As a result, the attachment workability of the seat is improved. .

In addition, when the main body case portion other than the stator side is configured to be freely detached from the stator side as in the present invention, when the high temperature treatment such as soldering is performed on the main body case, the high temperature applied to the main body case side is the stator of the motor. In particular, it is possible to be in a detached state so as not to be transmitted to the coil part or the like that is weak to heat, so that heat treatment to the main body case is performed well.

At this time, when the main body case portion is mounted and detached using the fixing bracket, structural positioning of the motor is easily and surely performed by the mechanical coupling relationship of the fixing bracket.

Next, an embodiment in which the present invention is applied to a valve driving apparatus for converting a refrigerant gas used in a hot air machine 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 is divided into a main body case 2 into which the refrigerant gas flows in and out, and the inside of the main body case 2. Two valve bodies 3a and 3b constituting a valve body for opening and closing the refrigerant gas, and a drive unit 4 for opening and closing the two valve bodies 3a and 3b. have.

The main body case 2 faces the main case 2a and the case cover 2b, each of which is formed of a roughly cup-shaped press corrugated part formed of a stainless steel (SUS) material, to face each other. And the tungsten inert gas (TIG) welding portion T in a state where the flanges disposed at the portions facing the case cover 2b are in close contact with each other, thereby forming a substantially cylindrical hermetic gas storage space.

More specifically, the main case 2a has a flat bottom wall surface 2a1 having a substantially circular shape, and a side wall surface 2a2 erected from an outer circumferential side of the bottom wall surface 2a1 in an annular manner. 2a1 and the side wall surface 2a2 form a relatively shallow cylindrical space which opens above FIG. 1 as an inner space of the main case 2a. In addition, the case cover 2b is formed in an approximately cup shape having a shape thinner and longer than that of the main case 2a, and is formed from a flat bottom wall surface 2b1 having a substantially circular shape and an outer peripheral side of the bottom wall surface 2b1. It has the annular side wall surface 2b2, and is fixed so that the lower end opening may be coat | covered at the upper end opening side of the main case 2a mentioned above in FIG. 1 of this case cover 2b.

In addition, the bottom wall surface 2a1 of the main case 2a has an inlet tube 5 for introducing refrigerant gas into the main body case 2 and two outlet tubes for allowing the refrigerant gas in the main body case 2 to flow out ( 6a) and 6b are respectively connected. That is, the main case 2a has three openings on its bottom wall surface 2a1, one of which is connected to the inlet pipe 5 and supplies refrigerant gas supplied through the inlet pipe 5 to the main case 2a. It becomes to put in). The other two openings are for inserting the inner space of the main case 2a and the outlet pipes 6a and 6b, respectively, to send refrigerant gas into the main case 2a to each outlet pipe 6a and 6b. It becomes for. Thus, in the present embodiment, all of the three pipe members 5, 6a and 6b are all connected to the bottom wall surface 2a1 of the main case 2a, and the same bottom as shown in this bottom wall surface 2a1. It is arranged to extend substantially parallel in the direction. This is because the main case 2a is made of a press-worked product as described above, and thus pipe connection is impossible unless such a parallel arrangement is made.

In addition, in the bottom wall surface 2a1 of the main case 2a, the connection portion between the two openings and the outflow pipes 6a and 6b has a normal valve connecting pipe 7a and 7b having a refrigerant gas passage hole at the center thereof. Each of these is fitted. Each of these valve connecting tubes 7a and 7b is formed of an elongated cylindrical member formed of deoxygenated steel or oxygen free steels C1220 and C1020 so as to penetrate the bottom wall 2a1 of the main case 2a. It is attached, and is fixed to the outer surface of the bottom wall surface 2a1 of the said main case 2a by the nickel solder part N. As shown in FIG. In each of these valve connection pipes 7a and 7b, a portion projecting outward from the inlet portion to the main case 2a to the outside (downward in Fig. 1) is formed in a relatively large diameter, and protrudes outward of the large diameter. The inside of the part is fixed by inserting the outflow pipes 6a and 6b described above, respectively. And between the large diameter part of these valve connection pipes 7a and 7b, and the outflow pipes 6a and 6b, the nickel soldering part N is also stuck.

Meanwhile, as shown in FIG. 5, the inlet pipe 5 is directly attached through the burring part B disposed on the main case 2a, but the outlet pipes 6a and 6b may also be connected by the burring part as well. have.

As described above, the case cover 2b is formed of a stainless steel (SUS) material and is fixed to the main case 2a formed of the same material by a TIG (tungsten inert gas) welding part T, but a conventional refrigerant valve 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 solder at the joining part. However, this soldering work is cumbersome because it is manual. In addition, if the soldering is automatically performed in a hydrogen reduction furnace instead of manual work, there may be a problem that zinc gas is generated in the brass part and cracks are generated in other welded parts. On the other hand, in the valve driving apparatus 1 of this embodiment, since both the main case 2a and the case cover 2b are molded of SUS material as described above, the above-mentioned problems do not occur and both are easily integrated by TIG welding. In this way, the case cover 2b bonded to the main case 2a forms the main body case 2 for enclosing the refrigerant gas in cooperation with the main case 2a.

On the other hand, a portion of the valve connecting pipe (7a) (7b) protruding toward the inner space side of the main case (2a) toward the axial direction (upward direction in Fig. 1) from the bottom wall surface (2a1) of the main case (2a) The valve spheres 3a and 3b are placed on each of the front end openings of the valve connecting pipes 7a and 7b that are placed upright and disposed over a predetermined height. The valve openings 7av and 7bv (particularly in Figs. 4 and Fig. 4) are formed in the vertically arranged openings of the valve connecting pipes 7a and 7b so as to form partial spherical shapes corresponding to the outer surfaces of the valve spheres 3a and 3b. 5 and FIG. 7) are formed, and the valve spheres 3a and 3b are placed in close contact with the valve spheres 7av and 7bv.

In particular, as shown in FIG. 7, the refrigerant gas passage holes 7a1 and 7b1 of the valve connecting pipes 7a and 7b have a small diameter dimension such that the flow rate of the refrigerant gas required for the apparatus can be secured. Although the coolant gas passage holes 7a1 and 7b1 are set, lead storage portions 7a2 and 7b2 are arranged at the connection portion between the inflow pipe 5 and the outflow pipe 6a, and the inflow pipe 5 is provided. And the excess lead agent stored in the soldering portion N used for the connection with the outflow pipe 6a is prevented from flowing into the refrigerant gas passage holes 7a1 and 7b1.

Further, jaw-shaped presses 7a3 and 7b3 are respectively formed at the center of the outer surface side of the valve connecting pipes 7a and 7b in the axial direction, and jaw-shaped presses 7a3 ( The end portions of the coil springs 7a4 and 7b4 attached to the outer circumferential portions of the valve connecting pipes 7a and 7b are supported with respect to the upper surface of Fig. 1 of 7b3). These coil springs 7a4 and 7b4 have a length that slightly protrudes from the upper end portions of the valve connecting pipes 7a and 7b, and the valve connecting pipes 7a and 3b are connected to the valve connecting pipes 7a. It has a function of pressing to push upward from the valve port 7av (7bv) of 7b.

In addition, the guide substrate of the guide member (2c) consisting of a press-formed product made of stainless steel (SUS) between the jaw-shaped pressing portion (7a3) (7b3) of the valve connecting pipe (7a) (7b) and the main case (2a) 2c1) is interspersed. In the guide member 2c, the guide substrate 2c1 is disposed to be in close contact with the bottom wall surface 2a1 of the main case 2a, and the valve connecting pipes 7a and 7b and the valve sphere 3a are described above. A pair of valve support frame 2c2 (2c3) which positions each of (3b) is arrange | positioned so that the said valve connection pipe | tube 7a (7b) may be followed.

That is, the two valve support frames 2c2 and 2c3 are arranged to ascend at substantially right angles from the guide substrate 2c1, and each of the valve connecting pipes 7a and 7b and the valve spheres 3a and 3b. The plane that surrounds the three rooms is formed to form an approximately C shape. And in each valve support frame 2c2 (2c3), a pair of C-shaped opening parts mutually mutually face toward a center side, and it is arrange | positioned with respect to both wall surfaces of each support frame 2c2 (2c3). The jaw-shaped pressing portions 7a3 and 7b3 of the valve connecting pipes 7a and 7b come into contact with each other so that they are fixed so as not to be displaced at a predetermined predetermined position. In addition, the valve connecting pipe (3a) (3b) is allowed to move within the range of the opening and closing movement described later in the substantially rectangular inner space formed by the respective valve support frame (2c2) (2c3) the valve connecting pipe ( It is fixed so as not to fall off from the valve opening 7av (7bv) of 7a) 7b.

The opening / closing operation of the valve spheres 3a and 3b is performed by the cam member 4a of the drive unit 4 arranged to contact the upper portion of the valve spheres 3a and 3b as described later. However, the guide member 2c has an evacuation slope guide part which opens both of the above-described two valve spheres 3a and 3b by moving the entire cam member 4a to the evacuation position of FIG. 1 upward. 2c4 (especially FIG. 6 and FIG. 8) is arrange | positioned. In the vicinity of the evacuation slope guide portion 2c4, a rotation stopping projection 2c5, which becomes the origin position when the cam member 4a is rotated, is disposed. Although the rotation stopper 2c5 constitutes the reference position locking portion, a detailed configuration of each of these members will be described later.

In addition, as described above, the guide member 2c is disposed in the inner space of the main case 2a, but the guide member 2c has a radial positioning portion in contact with the inner circumferential wall surface of the main case 2a. have. The radial positioning portion is in contact with the inner circumferential wall surface of the main case 2a at least three points, in this embodiment, over five locations, and more specifically, to bend in a tangential direction from the evacuation guide 2c4. Thus, the first positioning plate 2c6 extends integrally, and the edge portion of the tip of the first positioning plate 2c6 on the extended side is in contact with the inner circumferential surface of the main case 2a. Moreover, in the upper edge part of each said valve support frame 2c2 and 2c3, 2nd positioning plate 2c7 and 2c8 protrude toward the upper side of FIG. 1, and each 2nd positioning plate 2c7 and 2c8 In the width direction, both edge portions contact the inner circumferential surface of the main case 2a. And since these 1st positioning plates 2c6 and 2nd positioning plates 2c7 and 2c8 contact the inner peripheral wall surface of the main case 2a, the whole guide member 2c is radiated with respect to the main case 2a. It is designed to be easily and precisely positioned.

At this time, the second positioning plates 2c7 and 2c8 are arranged to be approximately the same height as the flange portion of the main case 2a connected to the case cover 2b side described above, and on the side of the case cover 2b side. It is performed in the arrangement relationship which contacts a flange part similarly to the flange part of the main case 2a.

On the other hand, the cam member 4a constituting the drive unit 4 is the center of the first cam member 4a1 of the disk-shaped member in contact with the valve spheres 3a and 3b and the first cam member 4a1. The cam part 4a3 which has the 2nd cam member 4a2 which protrudes toward the lower part of FIG. 1 from the side part, and especially the lower surface side of the said 1st cam member 4a1 as shown in FIG. At the same time, the cam surface 4a4 is disposed on the cylindrical main surface portion of the second cam member 4a2. Although the structure of the cam member 4a is mentioned later, the said drive part 4 is provided with the stepping motor 4b which becomes a drive source for rotating the cam member 4a, and this stepping motor 4b makes it the said 1st step. By rotating the first and second cam members 4a1 and 4a2, the valve bodies 3a and 3b are configured to open and close within a predetermined range in the main case 2a.

The stepping motor 4b has a stator part 4b1 on which coils are wound and mounted, a rotor part 4b2 opposed to the inside of the stator part 4b1, and a rotational center of the rotor part 4b2 is rotatable. It becomes the structure provided with the fixed shaft 4b3 which inserted and passed freely. When electric power is supplied from the power supply unit 4b4 to the coil of the stator unit 4b1, the rotor unit 4b2 rotates with the fixed shaft 4b3 as the rotation center.

The stator portion 4b1 is housed in a stator case 4b5 made of a predetermined resin member, and the stator case 4b5 is coupled to and detached from the fixing bracket 4b12 described later. It can be attached so that it can be freely mounted to and removed from the In the stator section 4b1, the coil is integrated with the extremes of the stator section 4b1 by resin and at the same time sealed.

On the other hand, in the rotor part 4b2, the magnet 4b6 is insert-molded in the resin molding material which consists of PBT (polybutylene tebutarate), and the magnet 4b6 radially with respect to the stator part 4b1. While being disposed to face each other, the central portion of the rotor portion 4b2 is freely rotatable with respect to the fixed shaft 4b3 serving as the center of rotation of the first and second cam members 4a1 and 4a2. have. This rotor part 4b2 is accommodated in the inner space of the case cover 2b of the main body case 2 mentioned above, and is spatially separated with respect to the stator part 4b1 side mentioned above by the case cover 2b. )

The fixed shaft 4b3 through which the rotor portion 4b2 is inserted is placed in a floating state by being press-fitted and fixed to approximately the center portion of the guide substrate 2c1 of the guide member 2c described above. 1 is inserted into the bearing recess 2b3 formed at the center position of the bottom wall surface 2b1 of the case cover 2b, and the lower end of FIG. 1 is fixed. Is inserted into the bearing recess 2a3 formed at the center position of the bottom wall surface 2a1 of the main case 2a in a relaxed manner. These two bearing recesses 2b3 and 2a3 are used as the positioning of the fixed shaft 4b3 at the time of assembly.

In addition, in the rotor portion 4b2, the upper end face of FIG. 1 is arranged 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 case cover ( Between the bottom wall surface 2b1 of 2b), the coil spring 4b7 which presses the whole rotor part 4b2 toward the main case 2a side which is lower than FIG. 1 is mounted in the compressed state, and this coil spring ( The rotor portion 4b2 is rotated while being biased toward the main case 2a by the force of 4b7). That is, when any one of the above-mentioned valve connection pipes 7a and 7b is opened by the action of the cam member 4a, it flows into the main case 2a through the open valve connection pipes 7a and 7b. Although the rotor part 4b2 is pushed to the bottom wall surface 2b1 side of the case cover 2b of FIG. 1 by the pressure of the refrigerant gas which came in, the said coil spring 4b7 pushes the rotor part 4b2 back at that time. Plays a role.

In addition, the coil spring 4b7 is pressed against the end of the rotor portion 4b2 through the flat seat 4b8, but is pressed against the bottom wall surface 2b1 of the case cover 2b through the steering seat 4b9. It is becoming. The steering-shaped seat 4b9 is a cylindrical portion formed by bending so as to be integrally raised from the flat surface portion 4b10 in contact with the bottom wall surface 2b1 of the case cover 2b and the outer circumferential edge of the flat surface portion 4b10. (4b11), the coil spring (4b7) is pressed against the surface of the flat surface portion (4b10). Moreover, the cylindrical part 4b11 of the said steering wheel 4b9 is attached so that the outer side of the coil spring 4b7 may be coat | covered.

On the other hand, the first cam member 4a1 and the second cam member 4a2 of the cam member 4a described above are integrally disposed on the cross section of the other end side (lower end side in FIG. 1) of the rotor portion 4b2. The first cam member 4a1 and the second cam member 4a2 rotate integrally with the rotor portion 4b2 using the stepping motor 4b as a driving source.

Among these, the 1st cam member 4a1 is formed with the sheet-like disk-shaped member, and the center is fitted to the fixed shaft 4b3 like the rotor part 4b2 mentioned above, and passes. And the cam surface 4a3 arrange | positioned at the lower end surface of FIG. 1 of this 1st cam member 4a1 is arrange | positioned so that it may face from the position just above with respect to the front end surface of the normal valve connection pipe 7a, 7b mentioned above. Valve bodies 3a and 3b for opening and closing the valve connecting pipes 7a and 7b are disposed between the cam surface 4a3 of the first cam member 4a1 and the valve connecting pipes 7a and 7b.

At this time, the pair of valve connecting pipes 7a, 7b and the valve spheres 3a, b are substantially symmetrical with respect to the axis center of the first cam member 4a1 and the second cam member 4a2. The pair of valve connecting pipes (7a) (7b) and the pair of valve spheres (3a) (3b) are respectively arranged in the region opposite to 180 ° around the fixed shaft (4b3) have. In other words, the pair of valve connecting pipes 7a and 7b and the valve spheres 3a and 3b are constituted in an arrangement relationship which forms a substantially linear positional relationship.

In this way, the pair of valve spheres 3a and 3b are arranged on a straight line when both of the valve spheres 3a and 3b are opened and closed to operate the pair of valve spheres 3a and 3b by a single cam member 4a. This is to ensure that the operation of closing the pair of valve spheres 3a and 3b at the same time can be performed reliably even if there is a nonuniformity in the height of each other or a slight rattling on the camshaft. However, if the cam member 4a itself is configured to oscillate in response to the nonuniformity of the height of the valve spheres 3a and 3b or the camshaft, the valve spheres 3a and 3b are arranged in a straight line as described above. There is no need to do it. In this case, as the rocking support structure of the cam member 4a, a variety of rocking support structures can be adopted, such as supporting the cam member so as to be swingable with the edge-shaped portion as a point.

The cam surface 4a3 of the first cam member 4a1 has a donut shape that is disposed opposite to the valve connecting pipes 7a and 7b, and the surface of the cam surface 4a3 is the valve sphere 3a ( Opening / closing operation is performed by pushing the valve spheres 3a and 3b toward or away from the valve spheres 3a and 3b toward the valve openings 7av and 7bv on the upper ends of the valve connecting pipes 7a and 7b. It is a shape to perform.

As described above, the valve spheres 3a and 3b operated by the cam surface 4a3 of the first cam member 4a1 are moved upward in FIG. 1 by the biasing force of the coil springs 7a4 and 7b4 as the biasing member. By pushing up, the valve spheres 3a and 3b are urged to always be in contact with the cam surface 4a3 by the force of the coil springs 7a4 and 7b4. In particular, the valve connecting pipes 7a and 7b When it is made from the closed state to the open state, it separates from the valve connection pipes 7a and 7b using the upward force of each said coil spring 7a4 and 7b4. Moreover, by such a structure, the contact with the cam surface 4a3 of the said valve body 3a, 3b is always reliable, and the valve body 3a, 3b operates reliably along the surface shape of the cam surface 4a3. It is supposed to. Next, the surface shape of the cam surface 4a3 disposed on the first cam member 4a1 and the operation of the valve spheres 3a and 3b will be described in detail.

In particular, as shown in FIG. 9, the cam surface 4a3 of the first cam member 4a1 includes a protruding peak portion 4a5 and a valve sphere 3a for operating in a direction to close the opening of the valve spheres 3a and 3b. Bottom valley portion 4a6 for operating in the direction of opening the opening of the 3b), and two slope portions 4a7 and 4a7 connecting the protruding peak portion 4a5 and the bottom valley portion 4a6. . The protruding peak portion 4a5 and the bottom valley portion 4a6 are formed to have a concave-convex shape in the axial direction of the fixed shaft 4b3, of which the protruding peak portion 4a5 is a valve inlet of the valve connecting pipes 7a and 7b. It is formed so as to protrude toward (7av) 7bv, and is formed in the range of the center angle of about 200 degree among the cam surfaces 4a3 of 360 degrees of the periphery center angle. In the present embodiment, the protruding peak portion 4a5 has a height of 0.7 mm with respect to the bottom valley portion 4a6, but the height may be arbitrarily selected depending on the design conditions. Accordingly, the valve spheres 3a and 3b are pushed toward the valve connecting pipes 7a and 7b when the valve spheres 3a and 3b are in contact with the protruding peaks 4a5 to close the valve inlets 7av and 7bv. do.

On the other hand, the bottom valley part 4a6 is formed in the range of the center angle of about 90 degree among the remaining 160 degrees of the cam surface 4a3. When the valve spheres 3a and 3b are opposed to the bottom valley portion 4a6, they are separated from the valve connecting pipes 7a and 7b by the above-mentioned force of the coil springs 7a4 and 7b4. The opening of the main case 2a is opened. The four slopes 4a7 and 4a7 are each formed in a range of about 35 degrees. These slopes 4a7 and 4a7 are for smoothly converting the contact with the valve spheres 3a and 3b between the bottom valley portion 4a6 and the protruding peak portion 4a5 when the cam member 4a1 rotates. .

On the outer circumferential surface of the first cam member 4a1, the engaging convex portion as a reference position locking portion for performing origin detection by allowing the rotational regulation of the rotor portion 4b2, that is, allowing the rotor portion 4b2 to rotate only within a predetermined range ( 4a8) is formed to protrude radially outward. The engaging convex portion 4a8 is formed at a position in contact with the rotation stopping projection 2c5 (especially FIGS. 6 and 8) formed at the uppermost level of the evacuation slope guide portion 2c4 of the guide member 2c. When the first cam member 4a1 is integrally rotated with the rotor portion 4b2, the first cam member 4a1 is configured to contact the rotation stopping projection 2c5 to prevent further rotation of the rotor portion 4b2. In this embodiment, this operation is used as the home position detection of the apparatus, the operation start point is determined by driving the stepping motor 4b a predetermined step from the home position, and opening and closing of both valve connecting pipes 7a and 7b. It is supposed to control the state. This home position detection operation may be performed after each operation start or may be performed once every several hours.

Further, even when the rotor portion 4b2 is rotated in the reverse direction to the predetermined position, the engaging convex portion 4a8 naturally comes into contact with the rotation stopping projection 2c5. At this time, the engaging convex portion 4a8 has a central angle in the range of 20 degrees on the main surface of the first cam member 4a1, while the rotation stopping projection 2c5 on the main case 2a side has a center angle of 20 degrees. It is formed in a range. Therefore, the rotor part 4b2 is rotatable in the range of 320 degrees. In the present embodiment, the engaging convex portion 4a8 does not touch the rotation stopping projection 2c5 by the normal reverse rotation operation. That is, when the stepped motor 4b stops before the engaging convex portion 4a8 contacts the rotation stopping projection 2c5, and the engaging convex portion 4a8 contacts the rotation stopping projection 2c5. In the case where there is a necessity at the start of driving or control, when a trouble occurs and an overstep condition occurs, the origin position detection is executed by the engaging projection 4a8.

On the other hand, the second cam member 4a2 is supported by the fixed shaft 4b3 and, like the first cam member 4a1, rotates integrally with the rotor portion 4b2. The second cam member 4a2 is disposed coaxially with the above-described first cam member 4a1, and is provided at both valve spheres 3a disposed at a position 180 degrees apart with the fixed shaft 4b3 as the rotation center. Located between 3b). A cam surface 4a4 is formed on the outer circumferential portion of the second cam member 4a2, and the cam surface 4a4 has a top portion 4a9 protruding toward the substantially central portion of the bottom valley portion 4a6 of the first cam member 4a1. ) Is placed. When the top portion 4a9 of the second cam member 4a2 contacts the valve bodies 3a and 3b, the valve bodies 3a and 3b are pushed toward the radially outer side (the valve body (Fig. 1) 3b)), thereby opening the valve connection pipes 7a and 7b.

In other words, the top portion 4a9 of the second cam member 4a2 is the valve sphere 3a (3a) when the valve spheres 3a and 3b face the bottom valley portion 4a6 of the first cam member 4a1. 3b) is pushed outward, and when the valve spheres 3a and 3b are spaced apart from the valve connecting pipes 7a and 7b by facing the bottom valley portion 4a6 by the configuration, the second By the top portion 4a9 of the cam member 4a2, the valve spheres 3a and 3b are moved in a direction orthogonal to the operation direction (left and right direction in Fig. 1) for opening and closing the opening. Accordingly, the second cam member 4a2 is a moving means in the outward direction of the valve spheres 3a and 3b, whereby the valve spheres 3a and 3b are reliably connected to the valve connecting pipes 7a and 7b. Can be opened.

Such a configuration is based on the following reasons. That is, since the valve spheres 3a and 3b are always biased toward the cam face 4a3 of the cam member 4a1 by the coil springs 7a4 and 7b4, when the valve spheres 3a and 3b face the bottom valley portion 4a6, As a result, the valves deviate from the openings of the valve connecting pipes 7a and 7b. However, there is a possibility that internal pressure is generated inside the main case 2a due to vibration or pulsation of the refrigerant gas, and the opening is blocked even though the valve spheres 3a and 3b face the bottom valley portion 4a6. . In such a state, since the internal air pressure acts to push the valve spheres 3a and 3b into the openings, only the force of the coil springs 7a4 and 7b4 separates the valve spheres 3a and 3b from the openings. There is a risk of losing.

In this state, when the valve spheres 3a and 3b are moved away from the opening by only the force of the coil springs 7a4 and 7b4, the coil springs 7a4 and 7b4 have a strong force. There is a need to do it. In addition, if the coil springs 7a4 and 7b4 having such a strong side force are used, the valve spheres 3a and 3b are reversed in response to this side force during the operation of opening to closing. This motor operation requires a considerable motor torque because it needs to be moved to the side (7b). Thus, when the valve bodies 3a and 3b face the bottom valley portion 4a6 of the cam surface 4a3 of the first cam member 4a1, the valve bodies 3a and 3b are forced by the protruding peaks 4a5 of the second cam member 4a2. The valve spheres 3a and 3b are pushed outward so as to be separated from the valve connecting pipes 7a and 7b, and the valves can be reliably raised without increasing the torque of the motor torque and the coil springs 7a4 and 7b4. The openings can be opened away from the spheres 3a and 3b by the valve connecting pipes 7a and 7b.

In addition, the coil springs 7a4 and 7b4 have a radius of the valve spheres 3a and 3b around the fixed shaft 4b3 by the protruding peak 4a5 of the cam surface 4a4 of the second cam member 4a2. When moved in the direction, it acts to return this movement state to the direction before the movement. That is, the coil springs 7a4 and 7b4 extend in accordance with their movement when the valve spheres 3a and 3b are moved outward. At that time, the coil springs 7a4 and 7b4 are intended to shrink while continuously maintaining a contact state with the valve spheres 3a and 3b. Therefore, the second cam member 4a2 rotates, the contact between the top portion 4a9 of the cam surface 4a4 and the valve spheres 3a and 3b is released, and the valve spheres 3a and 3b are not pushed outward. In a situation, the valve spheres 3a and 3b are returned to the position before the movement by the contraction of the coil springs 7a4 and 7b4 and the pressing force of the cam surface 4a3 of the first cam member 4a1.

Thus, the valve drive device 1 according to the present embodiment is for operating both valve spheres 3a and 3b by the rotation of the rotor portion 4b2 covering the above-described 320 degree range, and thus the both valves. The first mode in which the spheres 3a and 3b open and close both valve connecting pipes 7a and 7b, and open and close the two valve connecting pipes 7a and 7b in four states, i.e., both are closed. One of the second and third modes in which one side is closed and the other side is open, and the fourth mode in which both are open can be made.

First, as shown in Fig. 10A, in the first mode, the engaging convex portion 4a8 of the cam member 4a is raised to the uppermost value of the evacuation slope guide portion 2c4 disposed on the guide member 2c. The member 4a is moved up to the evacuation position above FIG. 1 together with the rotor portion 4b2. As a result, both of the two valve spheres 3a and 3b are kept open. In addition, in the first mode shown in Fig. 10 (A), the engaging convex portion 4a8 is brought into contact with the rotation stopping projection 2c5 to perform the home position detection, but the engaging convex portion 4a8 is the rotation stopping projection ( It is also possible to stop the stepping motor 4b at the moment when it hits 2c5) and set the state to the first mode.

In the second mode shown in FIG. 10 (B), the middle portion of the protruding peak portion 4a5 of the first cam member 4a1 is brought into contact with the valve sphere 3a, and the middle portion of the bottom valley portion 4a6 is opened. In contact with the sphere 3b, the valve connecting pipe 7a is closed with the valve sphere 3a, and the valve connecting pipe 7b is opened by moving the valve sphere 3b away from the valve connecting pipe 7b. It is. The second mode shown in Fig. 10B shows a state in which the first cam member 4a1 is rotated 90 degrees in the direction of the arrow at the home position, but the second mode is a protruding peak formed over 200 degrees. Since only 4a5 needs to be in contact with the valve sphere 3a, the rotation may be in the range of 10 to 160 degrees when viewed from the home position, but in this embodiment, the rotation angle of the first cam member 4a1 and the second cam member 4a2 are the same. 90 degrees of rotation because the top portion 4a9 of the second cam member 4a2 pushes the valve sphere 3b outward to open the valve connecting tube 7b when the shaft is rotated 90 degrees in synchronism with the rotation angle. Is set as a 2nd mode.

In the third mode shown in Fig. 10C, the first cam member 4a1 is rotated 180 degrees (270 degrees when viewed from the home position) from the second mode, that is, the middle portion of the protruding peak 4a5 is opened. Contact the sphere 3b, contact the middle portion of the bottom valley portion 4a6 with the valve sphere 3a, close the valve connecting pipe 7b with the valve sphere 3b, and close the valve sphere 3a The valve connecting pipe 7a is opened in a state where the valve connecting pipe 7a is separated from the connecting pipe 7a. The third mode shown in Fig. 10C shows a state in which the first cam member 4a1 is rotated 270 degrees in the direction of the arrow from 180 degrees from the above-described second mode and from the origin position, but this third mode is shown. Since the protruding peak portion 4a5 formed over 200 degrees only needs to be in contact with the valve sphere 3b, the rotation may be in the range of 160 degrees to 320 degrees from the origin position, but in this embodiment, the first cam member 4a1 is When the rotation angle is synchronized with the rotation angle of the second cam member 4a2 and rotated 270 degrees, the top portion 4a9 of the second cam member 4a2 pushes the valve sphere 3a outward so that the valve connecting pipe ( Since 7a) is opened, the third mode is set when the rotation is 270 degrees.

On the other hand, the fourth mode shown in Fig. 10D is an intermediate state between the first mode and the second mode described above, and the first cam member 4a1 is rotated 90 degrees from the first mode (180 degrees when viewed from the home position). The two valve spheres 3a and 3b toward both valve connecting pipes 7a and 7b near both ends of the protruding peak 4a5, which is 200 degrees of the first cam member 4a1. Both valve connecting pipes 7a and 7b are closed.

Here, each of the cam surfaces 4a3 and 4a4 of the cam members 4a1 and 4a2 described above has a coupling convex portion 4a8 disposed on the first cam member 4a1 and a stator 4a2 of the stepping motor 4b. An error absorbing surface is arranged as a margin to allow non-uniformity of the assembly rotation position occurring therebetween. That is, in the present embodiment, although the reference position locking portion including the engaging projections 4a8 and the rotation stopping projections 2c5 which are in contact with each other when performing the origin detection of the rotation of the stepping motor 4b described above is used, these engaging projections are used. The contact position between the portion 4a8 and the rotation stopping projection 2c5 causes nonuniformity in relation to the resolution step of the stepping motor 4b. For example, a four-pole motor corresponds to four steps or eight steps, and a predetermined theoretical error amount occurs from assembling, resulting in individual differences for each device. The stepping motor 4b described above In this case, even if it is initially set to the home position, a maximum position error of ± 4 steps occurs from the start of rotation.

Therefore, in the present embodiment, an error is obtained by extending the cam surface 4a3 of the cam member 4a1 described above over a length corresponding to the resolution step of the stepping motor 4b described above, for example, ± 4 steps. At the same time as the absorbing surface, an error absorbing surface having a length equivalent to, for example, two steps is disposed at the tip of the top portion 4a9 disposed on the cam surface 4a4 of the cam member 4a2. The opening and closing operation is not changed while the valve spheres 3a and 3b are in contact with each error absorbing surface.

On the other hand, the stator portion 4b1 of the stepping motor 4b is disposed on the radially outer side of the case cover 2b, and the stator portion 4b1 is housed in the stator case 4b5, and the main body case 2 The stator case 4b5 and the main body case 2 are attached to the main case 2a so as to be freely attached to and detached from each other via a fixing bracket 4b12 having an elastic force fixed to the main case 2a side.

More specifically, as shown in Fig. 2, an attachment hole arranged in the fixing bracket 4b12 made of a substantially rectangular thin plate material is pressed against the outer peripheral portion of the main case 2a, and the attachment hole of the fixing bracket 4b12 is press-fitted. The fixing bracket 4b12 is fixed in a state in which a plurality of elastic pieces 4b13 formed by bending at the edges of the opening are tightened with the outer circumferential surface of the main case 2a. At this time, in the opening edge of the attachment hole of the fixing bracket 4b12, the positioning projection 4b14 (see Fig. 1) protruding in the axial direction toward the flange portion side of the main case 2a is the main body case 2. Is arranged to protrude in the axial direction, and the positioning of the positioning projection 4b14 in contact with the flange portion of the main case 2a is performed so that the axial positioning is performed.

On the other hand, the locking hook 4b15 extending from the side edge of the fixing bracket 4b12 to be bent in an L-shape is arranged, and the locking hook 4b15 is caught on the outer circumferential surface of the stator case 4b5. An end portion 4b16 is formed, and the stator case 4b15 is attached to and detached from the end portion 4b16 so that the stator case 4b5 and the main body case 2 are mounted and separated.

In this way, the stator case 4b5 in which the stator part 4b1 is accommodated in the main case 2a of the main body case 2a through the fixing bracket 4b12 is mounted on the main body case 2, The case cover 2b previously welded to the case 2a is inserted into the central cavity of the stator case 4b5. The stator case 4b5 slides in the axial direction of the main body case 2, and the latch hook 4b15 of the fixing bracket 4b12 is elastically slid with respect to the end portion 4b16 disposed on the stator case 4b5. Falls after. Accordingly, the stator case 4b5 is fixed to the main body case 2 side. In addition, when removing the stator case 4b5 from the main body case 2, it can isolate | separate by pulling strongly in the direction which removes the stator case 4b5 from the main body case 2. As shown in FIG. Thus, since the stator case 4b5 can be detachably attached to the main body case 2 side, it becomes convenient at the time of maintenance of each part, such as the stator part 4b1, a coil part, or the power supply part 4b4 connected to it. .

In addition, the fixing bracket 4b12 is provided with a cutout portion 4b17 extending substantially linearly outward from the attachment hole described above, and the fixing bracket 4b12 is detached from the main body case 2. In this case, the inflow and outflow of the inflow pipe 5 and the outflow pipe 6a and 6b is performed through the cutout 4b17.

In addition, at one end of the fixing bracket 4b12, a fixing plate 4b18 for attaching the entire valve driving device 1 to the frame of the refrigerator is disposed. The fixing plate 4b18 is formed so as to bend the main body portion of the fixing bracket 4b12 at approximately right angles, and a fixing screw not shown in the pair of attachment holes 4b19 and 4b19 disposed in the fixing plate 4b18. The attachment is performed by penetrating the back.

Next, the opening and closing operation of the valve in the valve drive device 1 of the embodiment configured as described above will be described.

First, the apparatus is attached to a predetermined position such as a refrigerant flow path, and then the stepping motor 4b is driven by a predetermined step to perform the home position detection operation. That is, the coil of the stator part 4b1 of the stepping motor 4b is made into the energized state, and the said rotor part 4b2 is rotated in the predetermined direction over the predetermined step part (full step part for rotating 320 degree | times). Accordingly, when the first and second cam members 4a1 and 4a2 rotate integrally with the rotor portion 4b2 and rotate to the origin position, the engaging convex portion 4a8 formed on the main surface of the first cam member 4a1 is guided. The rotation stopping projection 2c5 formed at the uppermost level of the evacuation slope guide portion 2c4 of the member 2c is hit. As a result, rotation of the first cam member 4a1 is prevented, and rotation of the rotor portion 4b2 is also prevented. In this way, the position where the extra step is output while the rotation is prevented is set as the home position.

In this embodiment, in the origin position, the above-described first mode, that is, the valve connecting pipes 7a and 7b are all opened by the valve spheres 3a and 3b (see Fig. 10 (A)). . For this reason, when the refrigerant gas flows into the main body case 2 from the inflow pipe 5, the refrigerant gas flows out to the outflow pipes 6a and 6b, but the refrigerant gas does not flow into the main body case 2. There is a space between the valve connecting pipes 7a and 7b and the valve spheres 3a and 3b, so that both of them are isolated from each other through the air layer. When only the outflow pipe 6b side is opened from this state, and the outflow pipe 6a side is to remain closed as it is, it drives as follows.

First, the coil of the stator part 4b1 is energized, and the rotor part 4b2 is driven to rotate 90 degrees from an origin position. Then, the first and second cam members 4a1 and 4a2 integrally rotate with the rotor portion 4b2 in the direction of the arrow in FIG. 10A and become in the state of FIG. 10B. During this time, the valve sphere 3a maintains contact with the protruding peak portion 4a5 of the first cam member 4a1, and is pushed toward the valve connecting pipe 7a side. Therefore, the valve connection pipe 7a is kept closed, and refrigerant gas does not flow to the outflow pipe 6a side.

On the other hand, the valve sphere 3b is released from contact with the protruding peak portion 4a5 of the first cam member 4a1 first by the rotation of the first 10 degrees during the 90 degree rotation of the rotor portion 4b2. After the first 10 degrees of rotation, the valve sphere 3b contacts the slope portion 4a7 at the next 35 degrees of rotation and gradually moves away from the valve connecting pipe 7b by the biasing force of the coil spring 7b4. Then, after such a total rotation of 45 degrees, contact with the bottom valley portion 4a6 is started. At this time, the valve sphere 3b is further separated from the valve connecting pipe 7b by the force of the coil spring 7b4, and the valve connecting pipe 7b is opened. For this reason, the refrigerant gas flows to the outlet pipe 6b side.

Further, the valve sphere 3b is synchronized with the rotation of the first cam member 4a1 when the contact with the bottom valley portion 4a6 is started and the rotor portion 4b2 is rotated by 45 degrees (90 degrees from the origin position). It pushes out to the outer side (right side in FIG. 10 (B)) by the top part 4a9 of the 2nd cam member 4a2 which exists. For this reason, even if it does not move away from the valve connection pipe 7b by the force of the coil spring 7b4, it is reliably separated from the valve connection pipe 7b by the 2nd cam member 4a2, and the valve connection pipe 7b ) Becomes open. As a result, when the rotor portion 4b2 is rotated 90 degrees from the home position, the valve connecting pipe 7a is closed to close the outlet pipe 6a, and the valve connecting pipe 7b is opened to open the outlet pipe 6b. Becomes the second mode of.

Next, when the outflow pipe 6a in which the open / closed state is reversed from the state in which the second mode is set to the third mode in which the open state and the outflow pipe 6b are in the closed state is driven as follows.

The same direction as when the rotor part 4b2 is energized from the second state (the state in which the rotor part 4b2 is rotated 90 degrees from the home position) and the rotor part 4b2 is set to the second mode from the previous home position. Drive to rotate. Then, the first and second cam members 4a1 and 4a2 rotate in the direction of the arrow in FIG. 10 (B) integrally with the rotor portion 4b2.

The valve sphere 3a maintains contact with the protruding peak 4a5 of the first cam member 4a1 during the rotation of the first 100 degrees (90 to 190 degrees when viewed from the home position) of the rotor portion 4b2, and the valve connection It is in the state pushed toward the pipe 7a side. When the rotation of the rotor portion 4b2 exceeds 100 degrees (190 degrees from the origin position), the valve sphere 3a is released from contact with the protruding peak portion 4a5 of the first cam member 4a1, and the slope portion 4a7. Contact with is initiated. The valve sphere 3a gradually moves away from the valve connecting pipe 7a by the negative force of the coil spring 7a4 when the valve sphere 3a rotates at 35 degrees while being in contact with the slope 4a7. After the rotation of the total 135 degrees (225 degrees from the origin position), the contact with the bottom valley portion 4a6 is started. At this time, the valve sphere 3a is further separated from the valve connecting pipe 7a by the force of the coil spring 7a4, and the valve connecting pipe 7a is opened. For this reason, refrigerant gas flows to the outflow pipe 6a side.

Further, the valve sphere 3a is synchronized with the rotation of the first cam member 4a1 when the contact with the bottom valley portion 4a6 is started and the rotor portion 4b2 is rotated 45 degrees (270 degrees from the origin position). It is pushed out to the outer side (left side in FIG. 10C) by the top portion 4a9 of the second cam member 4a2. Therefore, even when the coil spring 7b4 does not move away from the valve connecting pipe 7a by the force of the coil spring 7b4, the valve connecting pipe 7a is reliably separated from the valve connecting pipe 7a by the second cam member 4a2. Open state.

On the other hand, the valve sphere 3b maintains contact with the bottom valley portion 4a6 of the first cam member 4a1 during the first 45 degrees of rotation of the rotor portion 4b2 (90 to 135 degrees from the origin position). , And keeps the state away from the valve connecting pipe (7b). During this time, the contact between the valve sphere 3b and the top portion 4a9 of the second cam member 4a2 is released. Therefore, the valve sphere 3b moves inward (left in FIG. 10 (B)) by the negative force of the coil spring 7b4 and returns to the position before being pushed out to the top 4a9.

When the rotation of the rotor portion 4b2 exceeds 45 degrees (135 degrees from the origin position), the valve sphere 3b is released from contact with the bottom valley portion 4a6 of the first cam member 4a1, and the slope portion 4a7. ) Is initiated. The valve sphere 3b gradually approaches the valve connecting pipe 7b in response to the negative force of the coil spring 7b4 when the valve sphere 3b is rotated at 35 degrees while being in contact with the slope 4a7. Then, after passing the rotation of such a total of 80 degrees (170 degrees from the origin position), the valve sphere 3b is brought into contact with the protruding peak portion 4a5. Accordingly, the valve sphere 3b completely contacts the valve connecting pipe 7b to close the valve connecting pipe 7b. The rotor portion 4b2 then rotates 100 degrees (170 degrees to 270 degrees when viewed from the home position). During this time, the valve body 3b maintains contact with the protruding peak portion 4a5, and the valve connecting pipe 7b maintains a closed state. Therefore, the refrigerant gas does not flow to the outflow pipe 6b side.

In this way, when the rotor portion 4b2 is rotated 270 degrees when viewed from the home position, the valve sphere 3a comes into contact with the bottom valley portion 4a6 and is pushed outward from the top portion 4a9 of the second cam member 4a2. The valve connecting pipe 7a is opened, the valve body 3b is in contact with the protruding peak 4a5, and the valve connecting pipe 7b is closed. As a result, when the rotor portion 4b2 rotates at the origin position, the outlet pipe 6a is opened by opening the valve connection pipe 7a and the outlet pipe 6b is closed by closing the valve connection pipe 7b. Becomes the third mode of.

In the case where the first mode is set again from the third mode thus formed, the rotor portion 4b2 may be rotated about 270 degrees in the opposite direction to the conventional direction. In addition, when the rotation is performed by 270 degrees, the fitting convex portion 4a8 of the first cam member 4a1 hits the rotation stopping projection 2c5 on the main case 2a side, and may be rotated about 260 degrees to avoid this. In that case, the second mode is rotated by 10 degrees less than the above-described operation, that is, 80 degrees from the first mode.

When the rotor portion 4b2 rotates to an intermediate position between the above-described second mode and the third mode, that is, the home position 180 degrees, both valve spheres 3a and 3b are formed of the first cam member 4a1. It is in contact with the protruding peak portion 4a5 and is pushed toward the valve connecting pipes 7a and 7b. Therefore, both valve connecting pipes 7a and 7b are in the fourth mode for maintaining the closed state, and the refrigerant gas does not flow through both of the outflow pipes 6a and 6b.

As described above, in this embodiment, since the press-worked product is used as the guide member 2c, the pipe connection can be reliably performed by using the guide member 2c. The situation in which the guide member is melted during the high temperature treatment can be avoided. In addition, the productivity is significantly improved as compared with the case where the guide member is used as a cut product.

In addition, the inlet pipe 5 and the guide member 2c made of the press-worked product are fixed by using the valve connecting pipes 7a and 7b fixed to the main case 2a of the main body case 2 as in the present embodiment. The outflow pipes 6a and 6b can be easily fixed by soldering or the like, and the guide member 2c can be fixed at the same time, so that a simple and reliable fixing structure can be obtained.

In this case, if the guide member 2c and the main body case 2 made of the press-worked product are soldered through the valve connecting pipes 7a and 7b as in the present embodiment, a simpler fixing structure can be obtained.

In addition, if the home position detection of the stepping motor 4b is to be performed by the rotation stop projection 2c5 disposed on the guide member 2c as in the present embodiment, the initial positioning can be performed by a simple configuration without using a sensor or the like. It becomes possible.

In the present embodiment, the shaft of the stepping motor 4b as the driving unit 4 is supported by the guide member 2c, so that the fixing structure of the driving unit 4 is simplified.

In the present embodiment, when the pair of valve spheres 3a and 3b is opened and closed by a single cam member 4a, the pair of valve spheres 3a and 3b is arranged in a substantially straight line. Even if there is a nonuniformity in the height of each of the valve spheres 3a and 3b or a slight rattling in the camshaft, the operation of closing the pair of valve spheres 3a and 3b simultaneously is surely performed by a simple configuration. Leakage can be effectively prevented.

When the valve connecting pipes 7a and 7b are positioned using the guide member 2c as in the present embodiment, the valve connecting pipes 7a and 7b are easily and reliably attached.

In addition, in this embodiment, since the guide member 2c is in contact with the main case 2c of the main body case 2 in the radial direction over three or more points, the attachment work of the guide member 2c is performed easily and reliably. All.

In addition, if the axial positional relationship between the guide member 2c and the main body case 2 is defined by the second positioning plates 2c7 and 2c8 as in the present embodiment, the fixed state of the guide member 2c is completely maintained. At the same time, when the assembly of the guide member 2c is poor, the main case 2a of the main body case 2 and the case cover 2b do not match with each other, and the assembly of the guide member 2c is immediately detected. .

In addition, when the side surfaces of the valve spheres 3a and 3b made of spheres are regulated by the guide member 2c as in the present embodiment, the positioning of the valve spheres 3a and 3b is satisfactorily performed in a simple configuration. .

In addition, when the evacuation inclination guide portion 2c4 for guiding the cam member 4a is arranged on the guide member 2c so as to open all the valve spheres 3a and 3b as in the present embodiment, Even if high heat is transmitted from the inlet pipe 5 and the outlet pipe 6a, 6b, the cam member 4a is evacuated so as to be separated from the inlet pipe 5 and the outlet pipe 6a, 6b, and thermally transferred through the air layer. As a result, the heat is prevented from conducting high heat to the cam member 4a side, and melting of the cam member 4a and the like is prevented. In addition, all the valve spheres 3a and 3b can be opened immediately even when the air inside the main body case 2 is discharged and the fluid is introduced into the main body case 2.

As described above, in the valve driving apparatus of the present invention, a cam member having a cam surface is disposed in the driving portion, and the valve body is operated by the cam surface of the cam member to open and close the opening of the main body case. Therefore, the screw part used for the conventional valve drive member is unnecessary. As a result, the opening and closing of the opening can be opened and closed with a simple configuration without the need for cumbersome work such as high-precision machining of the screw or alignment of the center position of the valve body and the opening. It is also possible to realize a low-cost valve driving apparatus suitable for mass production.

In addition, in this invention, since the press-processed product is employ | adopted as a guide member, pipe connection is performed reliably using this guide member, and a guide member melts at the time of high temperature processing, such as welding or heat processing, when using a resin material. The situation can be avoided. In addition, the productivity is significantly improved as compared with the case where the guide member is used as a cut product.

Claims (14)

A main body case having an airtight inner space, An inlet tube and an outlet tube connected to the inner space of the main body case to inflow and outflow the fluid into the inner space of the main body case; A valve body arranged to open and close the opening of the inflow pipe and the outflow pipe to an inner space of the body case; A drive unit for opening and closing the valve body; In the valve driving device having a guide member disposed in the main body case to regulate the inlet and outlet pipes and the valve body, The guide member is composed of a press-worked product, And a cam member having a cam surface, wherein the driving portion is provided with a cam member to operate the valve body to open and close the opening of the body case. The method of claim 1, While each connecting member to the main body case of the inlet pipe and the outlet pipe is attached via a valve connecting pipe fixed to the main body case, And a part of the guide member is sandwiched between the valve connecting pipe and the main body case to be fixed. The method of claim 2, The valve driving device, characterized in that the inlet pipe and outlet pipe and the main body case is fixed to the valve connecting pipe by soldering. The method of claim 1, The guide member is a valve driving device, characterized in that the rotation stop portion is arranged to be the home position of the drive unit. The method of claim 1, And the drive portion includes a motor as a drive source, and an axial support portion axially supporting the shaft of the motor is disposed on the guide member. The method of claim 5, The shaft of the motor is made of a fixed shaft, the fixed shaft is pressed against the shaft support of the guide member, at least in the guide member is arranged so that the press-in portion of the fixed shaft is in close contact with the body case Drive system. The method of claim 1, At the same time a pair of valve spheres are attached to each of the pair of inlet or outlet pipes, The drive unit is provided with a cam member that is rotationally driven to open and close the pair of valve body, And a pair of valve support frames for securing the pair of valve bodies in a substantially symmetrical positional relationship with respect to the rotation axis of the cam member in the guide member in a substantially linear position. The method of claim 7, wherein The valve support frame of the guide member is inserted into the outer peripheral portion of the valve connecting pipe is characterized in that it is arranged to extend the position arranged. The method of claim 1, And a positioning portion in contact with the guide member over at least three points on the inner circumferential wall surface of the main body case. The method of claim 1, The main body case is composed of a plurality of divided parts welded, the valve drive device, characterized in that arranged in such a way that a portion of the guide member is in contact with each of the plurality of divided parts. The method of claim 1, And the valve body is formed of a sphere, and the side surface portion of the sphere constituting the valve body is regulated by the guide member. The method of claim 1, At the same time as the drive member is disposed a cam member for rotationally driven to open and close the valve body, And the evacuation slope guide portion for displacing the cam member to the evacuation position so that all the valve bodies are opened. The method of claim 1, The drive unit includes a motor having a cam member for rotationally driving the valve element to open and close, a motor having a rotor axially supported for rotationally driving the cam member, and an axial end portion of the motor arranged to squeeze the rotor in the axial direction. A coil spring and a seating plate contacting one end of the coil spring while penetrating the shaft of the rotor into a hole are disposed, and the seating ring is formed from a ring-shaped flat surface portion at which one end of the coil spring contacts, and an outer edge of the flat surface portion. And a cylindrical portion bent so as to integrally cover the outer side of the coil spring. The method of claim 1, While the main body case is made of a press working member, a fixing bracket is fixed to the outside of the main body case by press-fitting, The drive portion includes a motor having a rotor and a stator, the rotor portion of which is housed in the body case, The main body case including the rotor is coupled to the stator side through the fixing bracket, the valve driving device, characterized in that coupled to freely.