JPS61191255A - Pulse motor for electron control expansion valve - Google Patents

Abstract

PURPOSE:To prevent refrigerant from leaking, by combining a bottom-covered cylindrical magnetic unit with cylindrical magnetic units in airtight system via non-magnetic units so that magnetic pole both groups provided for the respective units may be confronted together. CONSTITUTION:A bottom-covered cylindrical magnet unit 20 and cylindrical magnetic units 21, 22 provided with magnetic pole tooth groups 20a, 21a, 21b, and 22a are bonded together in airtight system, for example, are soldered together in airtight system, via corrugated non-magnetic bonding units 23 with thickness for providing space confronting specified magnetic poles, to form a bottom -covered cylindrical case 24 with an opening section at one end. Coils 2, yoke sections 24, 25 and the like are fixed on the outer peripheral section of the case 24, to form a stator 6, and at the same time, a rotor 10 is supported by a bearing 11 fixed on the upper face of the case 24 and a magnetic plate 27, to organize a pulse motor a. As the result, airtightness for refrigerant between the motor and the valve section is retained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an airtight structure of a pulse motor for an electronically controlled expansion valve used in an air conditioner or the like.

(Prior art and its problems) The mainstream of air conditioners (air conditioners) these days uses inverter air conditioners, that is, inverters (frequency converters) that are controlled by microcomputers, and uses an inverter (frequency converter) that adjusts the rotation speed of the compressor according to the air conditioning load. We are currently moving to an inverter air conditioner that can be adjusted in stages.

According to this method, for example, when an air conditioner starts operating, the compressor is rotated at high speed and the temperature in the room rapidly approaches the set temperature, and then the rotation speed is gradually lowered to reach the set temperature. It is now possible to control the conventional so-called 0.N7
Compared to the OFF control method, it is possible to shorten the start-up time, reduce fluctuations in room temperature, and reduce energy loss field. Therefore, it has the advantage of being able to control temperature with excellent comfort and energy savings. However, in order to take full advantage of the features of the inverter air conditioner as described above, it is essential that the flow rate of the refrigerant be controlled over a wide range in response to changes in the rotational speed of the compressor. However, it is difficult for conventionally used flow rate control valves, such as automatic temperature expansion valves such as capillary tubes, to fully meet this demand.

For example, recently electronically controlled pulse motors,
The above requirements are met by a valve called an electronically controlled expansion valve, which consists of a valve part equipped with a valve body that uses this as a driving part. It is a consumer product. Therefore, valves are required to have a long life, and in order to meet this requirement, the refrigerant flowing through the valve part leaks and wears out quickly, and the insulation of the motor coil at an early stage due to leakage and infiltration into the pulse motor side. There is a strong demand for reliable prevention of breakdowns due to deterioration.

Therefore, the first coil (2), which is made of the coil (2) shown in FIGS. 1 and 2, takes this countermeasure. Second stator forming part f3
) (41) are stacked on top of each other with an annular intermediate yoke plate (5) having magnetic pole teeth (5a) on the inner periphery.
In the internal space of the take (6), a case ( 7) is fixed. Then, the needle valve body (9) is moved to the valve seat 0 by the left and right rotation of the rotor 0α and the screw shaft (8) screwed into the support body az.
The refrigerant flow rate in the refrigerant flow path (L41 as) is adjusted by lowering the refrigerant into the valve port (13a) and exiting from the valve port (13a).

In addition, the one in Figure 2 transmits the output of the rotating shaft of motor A via the reduction gear mechanism tUa to the screw shaft side supported by the bearing αυ and the screw engagement plate aη, and its left and right rotation prevents the refrigerant from leaking to the outside. The needle valve body (9) supported by the bellows (II) is lowered and raised to open the valve opening (13).
The flow rate of the refrigerant is controlled by adjusting the opening degree of a).

The type shown in Fig. 1 does not have the reduction gear mechanism aQ or bellows (11) like the valve shown in Fig. 2, and the rotor On and the valve body (9) are directly connected.Therefore, it is low cost. It has the advantage of having a small number of parts, fast control start-up, and excellent cost and controllability.However, on the other hand, the type shown in Fig. There is a cylindrical case (7) which is thick enough to withstand internal pressure and have sufficient mechanical strength to prevent cold leakage. The gap between the magnetic pole teeth (1a) of the stator (6) and the magnetic pole head of the rotor aυ increases, resulting in an increase in power consumption due to a decrease in torque, which not only results in poor energy savings, but also reduces the required torque. If you try to achieve this, the external size will also increase, which has the disadvantage of requiring a large installation space.

On the other hand, the one shown in Fig. 2 does not have the above-mentioned drawbacks, but uses a spring-forced bellows member to prevent cold ionic leakage.

Therefore, it is necessary to use a torque-enhancing gear mechanism ae to compensate for the expansion and contraction, which not only increases the cost compared to the one shown in Fig. 1, but also increases the number of parts and reduces controllability due to a delay in the start-up of the control. It has drawbacks such as lower

The present invention has a simple structure and achieves both an airtight structure to prevent refrigerant leakage and an improvement in the efficiency of the pulse motor.
This was developed for the purpose of providing a pyres motor that achieves a longer life of an electronically controlled expansion valve, and the details thereof will be explained below with reference to the drawings.

[Configuration of the Invention (Means for Solving the Problems) Figure 3 is a sectional view showing the basic structure of the invention, Figure 4 is a sectional view showing the state in which the valve part is connected to the motor part, and Figure 5 1 is a partial configuration perspective view, and the features of the present invention are summarized in the following points. That is, as shown in FIG. 5(a), the magnetic pole tooth groups (20a) (2:La) (21b),
(22a) Bottomed cylindrical magnetic body ■, cylindrical magnetic body C
2fJt22 is hermetically bonded, for example, airtightly brazed, via a wave-shaped non-magnetic coupling member t23 (made of brass, for example) having a thickness sufficient to provide the required gap between magnetic poles, as shown in FIG. 5(b).
) is formed into a bottomed cylindrical case Q4 with an opening at one end. Then, as shown in Figure 3 (two coils (2) are placed on the outer periphery of the two cases
Fix the yoke part (c) and the stator part (6).
), and at the same time, the bearing a11 and magnetic plate (5) fixed on the upper surface of the case (goods) form the case c14 (two supported bearings αυ support the rotor a [as shown in Figure 4), and a pulse motor is formed. A and a needle valve body (9) at the open end (24a) of the bottomed cylindrical case Q4.
A valve seat (13) having a valve port (13a) and other valve components are housed in a case (c) with one end open, and the threaded valve part B is connected to the rotation axis of the rotor 0ω with its needle valve body (9). (1
0a) and hermetically sealed to form an electronically controlled expansion valve.

(Functions and Effects) With the above configuration, there is no need to use the non-magnetic cylindrical case (7) housing the valve part as in the conventional structure explained in FIG. An airtight isolation structure is achieved. Also, since there is no non-magnetic cylindrical case (7) between the rotor Ql and the stator (6) (which can withstand two refrigerant pressures C2),
The magnetic pole heads of the rotor and the magnetic poles of the stator can be brought into direct contact with each other with a small gap, and the length of the opposing gap can be set to 01 to 0.2 nm, which is the same as that of a normal pulse motor. Furthermore, without using the bellows a7) described above in FIG.
1) Since the rotor shaft and the valve body can be directly connected to each other, there is no need to use a gear mechanism. Therefore, it is possible to provide a small pulse motor for an electronically controlled expansion valve that is low in cost, has excellent controllability and energy saving properties, and eliminates the drawbacks of conventional ones.

According to experiments, as described above in FIG. 1, a non-magnetic cylindrical case (7) is interposed between the stator and rotor.However, according to the present invention, in order to obtain the same torque as that in FIG. 50% or less ('-).

Although the present invention has been explained above, the stator part of the pulse motor shown in the third factor (2) is specifically formed as follows. That is, it is formed outside the lower open end of the bottomed cylindrical magnetic case 0. An annular yoke disk (c) is placed in front of the stepped portion (24b) provided in the
After fitting and fixing, the first annular coil (2) is fitted, and the annular yoke disc (c) is further fitted and fixed thereon. And further on top of that is the second circular coil (2)
After fitting, a cylindrical yoke (A) having an insertion hole into the magnetic case (241) is fitted and fixed in the center.As shown in Fig. 4, the rotating shaft (10a) of the rotor a1
In the case where the needle valve body (9) is directly connected to the valve, the upper bearing O
It is necessary to provide a margin for movement at υ, which increases the length of the pulse motor in the direction of the central axis. Therefore, the fourth
As shown in the figure, a cavity (10b) into which the upper bearing Oυ is placed is provided in the rotor aυ to shorten the length.

(Modification) Although the present invention has been described above, the bottomed cylindrical case may be made double in order to more reliably cut off the refrigerant to the motor coil and the like. FIG. 6 is a sectional view showing an example of this, and shows a bottomed cylindrical magnetic case (
A bottomed cylindrical magnetic body (2), an intermediate cylindrical magnetic body (31), and an end cylindrical magnetic body (32) are placed on the outside of the non-magnetic (e.g. brass) cylindrical assembly (33) in an airtight manner. A bottomed cylindrical case (34) may be provided, and the coil (2) or the like may be fixed to the outer periphery of the case (34).

It goes without saying that a pulse motor with an arbitrary number of phases can be formed according to the present invention.

[Brief explanation of the drawing]

1 and 2 are schematic sectional views of a conventional device, FIG. 3 is a sectional view showing the basic structure of the present invention, and FIG. 4 is a sectional view of an embodiment of the present invention showing a state in which the valve portion is connected. , Figure 5(a)
(BL is a partial configuration perspective view, and FIG. 6 is a cross-sectional view showing a modification of the present invention. A: Pulse motor section, B: Valve section, (1)
... Yoke, (1a) ... Magnetic pole tooth group, (2
)... Coil, (31 (41... 1st. 2nd
Stator part, (5)... intermediate yoke plate, (6)...
... Stator part, (7) ... Non-magnetic cylindrical Koehne,
(8)...Screw shaft, (9)--@-needle valve body, αlamaa rotor, (Iυ...bearing, α
a-...Screw engagement plate, 0...Valve seat, (13a)
・・・Bengokuchi, fi4 m! 9... Refrigerant flow path, a
S...gear mechanism, tiη...screw engagement plate, or...screw shaft, al-...bellows, (to)...
・・Bottomed cylindrical magnetic material, Qυ(2) ・・・cylindrical magnetic material,
(zoa) (zla) (zlb) (z2a) ...
Magnetic pole tooth group, (c)...Nonmagnetic combination, (Foundation)...bottomed cylindrical magnetic case, @(c)...yoke, punishment...magnetic plate, (c)... )
...Valve body housing case, fence...Sealing part, (7)
...Typical magnetic body with bottom, (31)...Middle cylindrical magnetic body, (32)...Terminal cylindrical magnetic body, (33)...Nonmagnetic (e.g. brass) Cylindrical combination, (
34)...Bottomed cylindrical case. Patent applicant Nippon Pulse Motor Co., Ltd.
Procedural amendment to ψ (voluntary) 1. Description of the case Japanese Patent Application No. 60-29291 2 Name of the invention Pulse motor for electronically controlled expansion valves 3 Person making the amendment Relationship to the case Applicant Nippon Pulse Motor Co., Ltd. 4 Agent Nishi-Shinjuku 1, Shinjuku-ku, Tokyo -23-1 "Detailed Description of the Invention" column of the specification, "Brief Description of Drawings" column 6 of the specification, contents of the amendment, page 3, line 15 [coil (1)] of the specification. (1
)] Two corrections. Page 6, line 18, [magnetic plate (27)] is corrected to [bearing mounting plate (27)]. (3) Correct page 7, line 16 [01] to (0,1). (4) Correct page 9, line 16 [tubular spine case] to [tubular case with magnetic bottom]. (5) On page 11, line 1, [magnetic plate] is corrected to [bearing mounting plate]. (6) Correct page 11, line 7 [tubular case with a bottom] to [tubular case with a magnetic material bottom].

Claims (1)

[Claims] A bottomed cylinder in which a bottomed cylindrical magnetic body and a cylindrical magnetic body are airtightly connected via a non-magnetic substance so that the magnetic pole tooth groups provided on each side face each other, and a valve case can be connected to one end opening. 1. A pulse motor for an electronically controlled expansion valve, characterized in that a stator part is formed by forming a shaped case, a coil, a yoke, etc. are fixed to the outer periphery of the stator part, and a rotor is housed inside the stator part.