JPH02176283A - Valve controlling pulse motor builtup unit - Google Patents

Abstract

PURPOSE:To reduce the cost by reducing a number of part items by constituting a builtup unit storing in an outer case a pulse motor and a reduction mechanism, rotation-controlling the pulse motor driving an output shaft to rotate and performing a valve opening and closing control of a valve unit connected by a lock nut. CONSTITUTION:A pulse motor is formed by a stator part comprising an outer yoke 1, inner yoke 2 and an annular coil 3 and a rotor part comprising a rotor core 4, rotor spacer 4a and a motor pinion 4b, and this pulse motor is housed in an outer case 23 with a reduction mechanism constituted of intermediate gears 7a, 7b, 8a, 8b provided between the pinion 4b and an output gear 6a. A pulse motor builtup unit, consisting of the pulse motor and the reduction mechanism, is tightened and connected to an external valve unit by a lock nut 10. A thread hole 6b is provided in an output shaft 6 itself so as to be screwed to a thread part 14a provided in a stud 14, further the output gear 6a is meshed while rotating with the intermediate gear 7a so as to be longitudinally moved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a pulse motor for controlling valves used for controlling the flow rate of refrigerant in air conditioners, and controlling the flow rate of combustion gas, air, hot water, liquid fuel, etc. in baths and showers. It concerns an assembly.

[Prior Art] Recently, so-called electronic control valves whose rotation is electronically controlled using a pulse motor have been put into practical use, for example, as shown in FIGS. 2 and 3.

FIG. 2 shows an example of a pulse motor assembly used in the above electronic control valve, which includes an outer yoke 31 and an inner yoke 3.
2 and the annular coil 33 constitute a stator part, and the rotor 3
4 and the rotor shaft 35 constitute a rotor part, and the inner tooth pole part 3
1a.

A non-magnetic airtight case 36 that fits into the rotor 32a is provided, and inside the airtight case 36, a rotor 34, which has a screw shaft portion 35a and a needle valve body 37 on the output side of the rotor shaft 35, is connected to a bearing 38a and a screw engagement plate 38. As a result, it is supported so that it can move up and down freely and rotate and hang. The flow rate from the valve passage 41 to the passage 42 is controlled by lowering or raising the needle valve body 37 relative to the valve seat 40 of the valve port 39 as the rotor 34 rotates in the forward and reverse directions. be.

Also, what is shown in FIG. 3 is another example of this type of pulse motor assembly, in which the rotational output of the pulse motor 51 is
The reduction gear mechanism output shaft 52a is shaped like a flat head screwdriver and is engaged with and transmitted to the flat head screw shaft 55 supported by the bearing 53 and the screw engagement plate 54 via the reduction gear mechanism 52, and the bellows 56 is rotated forward and backward. The flow rate is controlled by lowering and raising the needle valve body 57 supported by the valve opening 58 to adjust the opening of the valve port 58.

[Problems to be Solved by the Invention] Incidentally, in the pulse motor assembly for valve control as described above, leakage of the fluid flowing through the valve portion 59 may cause damage such as corrosion of the pulse motor coil and deterioration of insulation, consumption of the refrigerant, and gas leakage. In order to prevent explosions, etc., it is necessary to prevent fluid leakage. In addition, in recent years, the field of use of this type of valve control has expanded from commercial to home use, so there is a strong demand for small, efficient, large thrust, low current consumption, high resolution, and low cost. It is being

However, the conventional valve control pulse motor assembly as described above has the following problems.

In the pulse motor assembly shown in FIG. 2, the rotor part and valve part of the motor are housed in the sealed case 36, and the stator part is fixed to the outer periphery of the case 36, so the gap between the stator part and the rotor is large. Therefore, the torque is small, which means that the thrust force must be small. Therefore, in order to obtain the required thrust, the entire motor assembly inevitably becomes larger, which not only increases cost, but also increases power consumption, power supply capacity to drive the motor, and transistor capacity to drive the motor. The disadvantage is that everything is larger. Furthermore, since the rotor shaft 35 directly serves as the output shaft, there is a problem in that the resolution (number of steps per rotation) of the motor itself must be as low as 48 steps/rotation.

Next, in the pulse motor assembly shown in Fig. 3, the final output shaft is driven through a reduction mechanism, so compared to the one in Fig. 2, the motor is smaller, the power consumption is lower, and the reduction mechanism is smaller. A larger thrust can be obtained and the resolution is higher (
If the reduction ratio is l/30, the resolution is 48x 30=
Although it has the advantage of 1440 steps/rotation), as shown in Figure 4, it requires machining of the output shaft of the deceleration mechanism into a flathead screwdriver shape and machining of the screw shaft with a flathead groove, which only increases production costs. However, there was a problem that the number of parts was large.

The present invention was made based on the idea that the pulse motor, deceleration mechanism, and valve body in a pulse motor assembly for valve control as shown in FIG. 3 could be made more rational. A valve control with a rational structure that takes advantage of the advantages of the one shown in Figure 3, such as large thrust, small size, low power consumption, and high resolution, while also reducing costs by reducing the number of parts and reducing airtightness costs by improving the design. The object of the present invention is to provide a pulse motor assembly.

[Means for Solving the Problems] In order to achieve the above object, the valve control pulse motor assembly of the present invention includes a pulse motor consisting of a stator section and a rotor section, and outputs rotation of a motor pinion of this pulse motor. A deceleration mechanism includes a group of intermediate gears for decelerating and transmitting the deceleration to an output gear fixed to a shaft, an output bearing that supports the output shaft, and an outer case having a lock nut that is tightened and connected to an external valve unit. , and the pulse control and deceleration mechanism are housed in the outer case, and the valve opening/closing control of the valve unit connected by the lock nut is performed by rotationally driving the output shaft by controlling the rotation of the pulse motor. I made them do it.

[Function] According to the present invention, the output of the pulse motor is transmitted to the output shaft integrated with the output gear via the speed reduction mechanism including the motor pinion, the intermediate gear group, and the output gear. Since the output shaft is movably engaged with the stud, the output shaft rotates or moves forward and backward while rotating due to the rotational driving force of the pulse motor. In the case of forward and backward movement, the motor torque is "m (g-cm)" and the reduction ratio is 1.
/N, reducer efficiency is η0, output shaft screw pitch is Pl(c
m), screw efficiency is η2, and screw thrust is F(8), then F=T′″1°2″″1°″2(g) ...(1)
P.

Then, the screw speed S (cm/s) is as follows: 5=f'P・ , , N( COI/S) ...(2)
becomes.

For example, the outer diameter is 25mm, the thickness is 15m1Q, the step angle is 7.5 degrees, the number of steps per revolution is 48, and the frequency is 200 (s).
When using a small pulse motor with a torque of 80 (g/cm) at
Deceleration efficiency 0.72, output screw pitch 0.05 (cm
), and the screw efficiency is 0.2, the thrust force F from the above equation (1) is ~32572 (g) L932.6 (kg), and the screw speed S is from the above equation (2), S m 20
0xOx"0546.94X 10-'(am/s)8
It becomes x30.

That is, 32.6 (kg) thrust and 6.94X
This means that the valve can be opened and closed at a speed of IQ-' (cm/s).

In control using refrigerant, gas, air, water, etc., numerically the heat transfer time constant is from several minutes to several hours, so even if the valve's fully closed and fully opened strokes are 2 mm, the
Since this can be done in seconds, a control valve that is a combination of a small motor and a speed reducer can perform this function satisfactorily.

In this manner, the present invention achieves the valve opening/closing control function with a simplified structure.

In addition, control valves for refrigerants are often used under low-temperature conditions (and often cause problems such as dew condensation, icing, and rust in motors and speed reduction mechanisms. Conventionally, this type of control valve As a countermeasure to these problems, pulse motor assemblies for motor vehicles have been made airtight by using sealants or adhesives for the air flow part of the control valve, or by molding the entire control valve with resin.However, with these methods, There were many problems with poor airtightness, too much work time, poor productivity, and high costs.

However, in the present invention, the airtightness is achieved by compressing a rubber seal or the like, and further, the airtightness can be maintained simply by pouring a sealant with high adhesiveness and drying properties into the pool part provided on the non-output side of the outer case. Improved workability,
It does not require special production equipment and can be mass produced and supplied at low cost.

Furthermore, the structure in which the pulse motor assembly and valve unit of the present invention are combined also has the advantage that the components can be simplified overall.

[Embodiment] FIG. 1 shows an embodiment of the present invention, and a pulse motor used in this pulse motor assembly has a stator section composed of an outer yoke 1, an inner yoke 2, and an annular coil 3;
The pulse motor consists of a rotor portion composed of a rotor core 4, an integrally molded rotor spacer 4a, and a motor pinion 4b. , 8
The outer case 2 along with the deceleration mechanism consisting of a and 8b.
It is stored within 3. The outer case 23 is made of metal, for example,
Made of zinc die-cast material into a seamless, integrated pipe.

Each gear of the speed reduction mechanism is housed in an outer case 23. In this case, the rotor shaft 5 is supported by a rotor bearing 23a provided in the outer case 23 and a shaft hole 12a provided in the main plate 12, and the rotor shaft 5 At the same time, intermediate gears 7a and 7b are inserted into the rotor shaft 5 by a string. Further, the intermediate gears 8a and 8b are inserted by string into a stud 14 caulked into a stud shaft hole 11a provided in a flange 11 welded to the outer yoke 1.

Note that the base plate 12 is, for example, a galvanized steel plate, and the rubber sheet 13 is held by claws 23b provided on the outer case 23.
It is caulked together.

Both the intermediate gear 7b and the output gear 6a that mesh with the intermediate gear 7b are spur gears, and the output shaft 6 integrated with the output gear 6a has a screw hole 6b formed therein, and the screw hole 6b is connected to the stud 14.
It is screwed into the threaded portion 14a provided in the.

The lock nut 10 is used to tighten and connect the pulse motor assembly consisting of the pulse motor and deceleration mechanism configured as described above to an external valve unit. It bites into the end of the unit's connecting pipe to maintain airtightness.

Furthermore, the lock nut 10 has a groove 23d provided in the outer case 23.
By fitting the stopper ring 21 into the lock nut 10, a structure is adopted to prevent the lock nut 10 from coming off.

A straight portion of the output shaft 6 is fitted into the output bearing 9 to support the radial load. The ball 6C is a steel ball fixed to the tip of the output shaft 6. When acting on the valve body, it rotates while pushing, so the purpose is to reduce frictional resistance and prevent wear.

Furthermore, the structure is such that a stopper ring 22 is fitted into a groove 6d provided in the output shaft 6, and when the output shaft 6 is raised by the rotational power of the pulse motor, the stopper ring 22 and the output bearing 9 This function is to mechanically stop the gear and prevent it from hitting the intermediate gears 8a and 8b, which are spur gears. In addition, when the output shaft 6 descends, it is mechanically stopped by the stepped portion 6e provided on the output shaft 6 and the stepped portion 9a provided on the output bearing 9, and the amount of protrusion of the output shaft 6 is regulated and the output gear 6
The omission of a serves as a preventive function.

The output bearing 9 is preferably made of metal such as brass or phosphor bronze, and the lock nut 10 is preferably made of brass.

The screw hole 6b of output @6 is, for example, a 3nuu screw with a pitch of 0.5 mm. Output gear 6 consisting of spur gear
Since the output shaft 6 is fixed to the output gear 6a, the output gear 6a moves forward and backward (goes straight up and down) as the output gear 6a rotates through mesh transmission with the intermediate gear 7a.

The intermediate gears 8a and 8b are integrally molded.
b meshes with the motor pinion 4b.

In this example, the first stage has a reduction ratio of 1/3.2, the second stage has a reduction ratio of 1/3.125, and the output stage has a reduction ratio of 1/3. It is a reduction ratio.

The structure of the motor section is a permanent magnet type pulse motor, and the bearing and the bearing mounting plate on the non-output side are omitted. A string is inserted into the rotor shaft 5 which is fixed by a rotor bearing 23a provided in the base plate 12 and a shaft hole 12a provided in the base plate 12.

The pulse motor includes a rotor shaft 5, the rotor section, an outer yoke 1, an inner yoke 2, a flange 11, a stud 14, a coil bobbin 15 for winding, a post 16 used for drawing out the winding to the outside, and a solder that fits into the post. It is composed of a flexible printed circuit board 17 to be attached, a post 18 to be soldered by relaying a lead wire, a board 19 made of glass epoxy material to solder and support the post 18, and a bush 20 to fix the board 19. There is.

In addition, the pulse motor, the speed reduction mechanism, and the main plate 12
is accommodated by the base plate 12 while pressing the rubber sheet 13 against the outer case 23, a power supply lead wire connection portion 26 is provided in a pool portion provided on the non-output side of the outer case 23, and a sealant 24 is applied to the pool portion. The pulse motor assembly is sealed to prevent water from entering the pulse motor assembly due to capillary action through the power supply lead wire 25 from outside.

The rotor magnet is N524 pole, and the pulse motor is 2-phase or 4-phase. Pulse motor has 7 per signal
．． Rotate in steps of 5 degrees.

That is, the motor rotates once in 48 steps.

As mentioned above, since the reduction ratio is 1730 and the output shaft screw pitch is 0.5 mm, the pulse motor rotates 1 step, that is, 1748 times, resulting in 1/30X 1/
The output shaft 6 rotates by 48 = 1/1440, and the amount of linear movement is 0.5X 1/1440#0.000347 (
mm per step). Further, as explained in the above operation, a thrust of 32.6 (kg) and a control speed of 6.94 x 10'' (cm/s) can be achieved.

The pulse motor assembly shown in this embodiment is used in conjunction with a needle valve unit or the like. A ball 6C at the tip of the illustrated output shaft 6 moves the valve body forward and backward to open and close the flow path to control the flow rate.

In this embodiment, a screw hole 6b is provided in the output shaft 6 itself.
is provided so as to be screwed into the threaded portion 14a provided on the stud 14, and the output gear 6a engages with the intermediate gear 7a and moves forward and backward while rotating, so the structure is simplified.
The number of parts and the amount of processing are reduced, improving reliability. In addition, since the structure is a drop-in type, assembly work is easy, and the rotor shaft 5 and intermediate gears 7a, 7
Since the stud 14 and the intermediate gears 8a and 8b are provided coaxially, wasteful space is reduced, the external size can be made smaller, and a large propulsion force can be obtained at low power consumption and low cost.

Moreover, since the non-output side of the outer case 23 is sealed with the sealing material 24, the internal pulse motor etc. are completely protected against water.

In the embodiment shown in FIG. 1, an example is shown in which the output shaft 6 moves forward and backward while rotating, but the threaded portion 14a of the stud 14 is omitted and the output shaft 6 is made into a rotating tri-bar type, so that the load can be reduced. It can be applied to a valve unit that opens and closes by turning the valve.

[Effects of the Invention] As explained above, according to the present invention, the output gear fixed to the output shaft engaged with the stud meshes with the intermediate gear of the output stage having a string inserted into the rotor shaft. Since the output shaft is rotatably driven, the structure is simplified, the number of parts and the amount of machining are reduced, and reliability is improved.The structure is a drop-in type, so assembly work is easy. Since the gear group of the reduction mechanism can be made of resin, the effect of muffling noise such as the tapping sound of the tooth surfaces of the gear group is improved, and it can be made compact, reducing wasted space. It is possible to reduce the external size. What's more, all parts of the outer case except the output end can be easily sealed to prevent moisture from entering through lead wires, etc., and the internal pulse motor etc. are protected against water and become inoperable. This improves reliability.

Therefore, it is possible to provide a pulse motor assembly for controlling a valve that is small in size, low in cost, and has a large thrust, including the control valve, using a small pulse motor.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing one embodiment of the present invention, FIG. 2 is a front sectional view showing one example of the conventional technology, and FIG. 3 is a front sectional view showing another example of the same. FIG. 4 is an enlarged perspective view showing a part of the flathead screwdriver-like output transmission section of FIG. 3. l...Outer yoke 2...Inner yoke 3...
Annular coil 4... Rotor core 4b... Motor pinion 5... Rotor shaft 6... Output shaft
6a... Output gear 6b... Screw hole 7a,
7b...Intermediate gear 8a, 8b...Intermediate gear 9.
... Output bearing 11 ... Lock nut 12 ... Base plate 13 ... Rubber sheet 14 ... Stud 14a.
...Threaded portion 15...Coil bobbin required for winding 16...Post 17...Flexible printed circuit board 18...Post 19...Board 20...Bushing 23...Outer case 23a...Rotor Bearing 24...Sealing material 25...Power supply lead wire 26...Power supply lead wire connection part and 4 others

Claims (1)

[Scope of Claims] 1. A reduction mechanism consisting of a pulse motor consisting of a stator section and a rotor section, and a group of intermediate gears for decelerating and transmitting the rotation of a motor pinion of this pulse motor to an output gear fixed to an output shaft. and an outer case having an output bearing that supports the output shaft and a lock nut that is tightened and connected to an external valve unit, and the pulse motor and the speed reduction mechanism are housed in the outer case, and the pulse motor and the speed reduction mechanism are housed in the outer case, and 1. A pulse motor assembly for valve control, characterized in that the valve opening/closing of the valve unit connected by the lock nut is controlled by rotationally driving the output shaft by controlling the rotation of the motor. 2. The valve control pulse motor assembly according to claim 1, wherein the output shaft is screwed into a stud so that the output shaft is rotated and moved forward and backward with the rotation of the output shaft. 3. The valve control pulse motor assembly according to claim 1 or 2, wherein a power supply lead wire connection portion is provided in a pool portion provided on the opposite side of the outer case, and a sealing agent flows into the pool portion to seal the pool portion. 4. The valve control pulse motor assembly according to claim 1, 2 or 3, wherein the outer case is formed of a seamless, integrated metal pipe.