JP2001349467A - Motor-operated valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability by preventing leak of a refrigerant outward even when cracking occurs in bellows. SOLUTION: An output shaft bearing 31' and a valve body 32 provided at a bottom part 39 of a gear case 20' are connected to each other by a holder 101, the output shaft bearing 31' is threadedly engaged with the holder 101, and the holder 101 is coupled with the valve body 32 by a lock nut 42. A deformed picking 102 inserted as a seal member between the output shaft bearing 31' and the holder 101 is provided on a recessed part 311 of the output shaft. The deformed packing 102 seals a first valve stem 251, and also seals between the holder 101 and the output shaft bearing 31'. Sealability between the holder 101 and the valve body 32 is secured by a rubber packing 104, and a seal part 105 is formed of an edge part 101' at a tip of the holder 101, thereby sealability is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor-operated valve, and more particularly to a motor-operated valve for transmitting the output of a motor to a main body via a gear.

[0002]

2. Description of the Related Art Conventionally, a motor-operated valve that transmits the output of a motor to a valve body via a gear has been known as a motor-operated valve. As this kind of electric valve, the electric valve having the configuration shown in FIG.
No. 0-123572. 4, a motor 21 is built in a motor case 20, and a pinion 23 in a gear case 20 'is fixed to a shaft 22 of the motor. Reference numeral 24 denotes a relatively thin gear that meshes with the pinion 23. Reference numeral 25 denotes an output shaft which is formed integrally with the gear 24 and has a cylindrical portion 26 at an upper portion and a screw portion 27 at a lower portion across the gear.

[0003] A bearing 29 is provided on a partition wall 28 of the case 20, and supports a cylindrical portion 26 of the output shaft 25. An output bearing 31 is provided on a bottom portion 30 of the gear case 20 ', and a screw portion 27 of the output shaft 25 is screwed. Therefore, when the motor 21 rotates forward and backward, the pinion 23 also rotates forward and backward, and the output shaft 25 also rotates forward and reverse via the gear 24. When the output shaft 25 rotates forward and backward, the output shaft 25 moves up and down by rotation of the screw portion 27. At this time, the gear 24 is
The pinion has a considerable height so as not to disengage from it.

[0004] Reference numeral 32 denotes a cylindrical valve body, a first passage 33,
There is a second passage 34 communicating with this passage. However, the two passages are respectively connected to the refrigerant pipe. In addition, a case is shown in which a valve seat 35 is fixedly provided as a separate component by brazing or the like at a communicating portion between the first passage and the second passage. The valve seat may be formed integrally with the valve body.

[0005] Reference numeral 36 denotes a valve body, the lower end of which faces the valve seat, and the upper end of which contacts the lower end of the output shaft 25. The abutting portion is in the form of a rotatable pivot bearing, and the lower end 37 of the output shaft and the upper end 38 of the valve body, which are subjected to rotational friction, are each hardened by quenching so that wear does not occur due to friction between the two. It is. The valve body 32 is provided with a partition wall 40 having a hole 39 through which the valve body can slide. The bellows 41 has one end on the inner wall of the valve body 32 and the other end on the valve body 36.
Each is attached airtight. However, the holder 31 and the valve body 32 are connected by the nut 42.

FIG. 5 is a diagram showing the configuration of a valve main body, a valve body, and a bellows, which are main parts of the motor-operated valve in FIG. However, the valve seat shows the case where it is integral with the valve body. In the figure, a brass valve body 32 is connected to a holder by a nut as shown in FIG. 4, a valve seat 351 is formed integrally with the valve body 32, and a valve body 36 is composed of a first valve body 361 and a second valve body. 362, and one end of the first valve body 361 has a valve seat 351 at one end thereof.
The other end is fitted with the other end of the second valve body 362, and a bush 364 is press-fitted into one end of the second valve body 362.

The bush 364 constitutes a contact portion between the output shaft 25 and the valve body 362, and is formed in a convex shape using, for example, stainless steel, and the sphere 363 comes into contact with the hollow portion of the bush 364. The sphere 363 made of, for example, stainless steel is welded to the output shaft 25 by, for example, spot welding, and the sphere 363 serves as a pivot bearing.
It is interposed between the second valve body 362 and the output shaft 25.

The bellows 41 has one end fixed to a washer 412 fixed to the end of the valve body 32 by soldering, and the other end connected to a locking portion 413 which is a convex portion formed on the valve body 362. Fixed by soldering.

In such a configuration, when the motor 21 rotates in one direction, the pinion 23 rotates through the shaft 22,
As the flat gear 24 meshing with the pinion 23 rotates, the output shaft 25 also rotates in one direction. Due to the rotation of the output shaft 25 in one direction, the output shaft moves downward, for example, in FIG. 4, and lowers the valve element 36 which is in contact with the lower end of the output shaft. The flow rate of the refrigerant flowing through the passage 34 is controlled. The bellows 41 is attached to the valve body 36.
A function of preventing the refrigerant flowing into the front end of the motor from entering the motor. When the motor 21 rotates in the other direction, the output shaft 25 rotates in the other direction contrary to the above.
The valve body 36 is raised to control the flow rate of the refrigerant.

Now, when the valve body 36 is maintained at a predetermined opening relative to the valve seat 35, the second passage 34 is moved from the first passage 33 to the second passage 34.
When the refrigerant flows toward, the refrigerant pressure acts to push up the bellows 41, so that the valve element 36 receives a force in the opening direction in this flow direction. Therefore, output shaft 2
5 operates in a state where it is always pushed upward through the valve body 36.

On the contrary, the refrigerant flows from the second passage 34 through the first passage 34.
Also when flowing into the passage 33, the valve body 36 receives a load in the opening direction, so that the screw portion 27 of the output shaft 25 always operates in a state of being pushed upward similarly to the above. Therefore, the refrigerant always flows into the screw portion 2
7 flows upward by pushing it upward, so that the flow rate does not change in either the forward or reverse direction, and accurate control can be performed.

[0012]

In such a conventional motor-operated valve, since the comfort in the room is expected more recently, the frequency of use thereof is increased, and the valve body 36 is repeatedly moved up and down frequently. The expansion and contraction of the bellows 41 will be repeated frequently. As a result, the bellows 41 becomes fatigued, and the deterioration thereof may cause a crack in the bellows 41. If this crack should occur, there is a possibility that the refrigerant may leak into the motor or into the room.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to prevent the refrigerant from leaking to the outside even if a crack occurs in the bellows. An object of the present invention is to provide a highly reliable electric valve.

[0014]

In order to achieve the above object, an embodiment of a motor-operated valve according to the present invention comprises an output shaft supported by an output bearing to which the rotation of a motor is transmitted via a gear, and an output shaft supported by the output shaft. A valve body hermetically provided with a bellows one end of which abuts and the other end of which comes into contact with and separates from a valve seat formed in the valve body, a holder for connecting the output bearing and the valve body, the holder and the output bearing And a seal material provided between the output shaft and the holder and the output bearing.

Further, a preferred embodiment of the present invention is characterized in that the sealing material is a modified packing. Further another embodiment of the motor-operated valve according to the present invention, an output shaft supported by an output bearing to which the rotation of the motor is transmitted via a gear,
One end thereof abuts, and the other end comprises a valve body airtightly provided with a bellows which comes into contact with and separates from a valve seat formed on the valve body, and a sealing material provided on the output bearing. A seal is provided between the output shaft and the output bearing.

Furthermore, a preferred embodiment of the present invention is
The sealing material is an O-ring. The O-ring is supported by a washer.

According to the motor-operated valve of the present invention, even if refrigerant leaks from the bellows due to fatigue of the bellows due to the vertical movement of the valve body, the leakage of the refrigerant to the motor side or the outside can be prevented by the sealing material. Thus, the reliability of the motor-operated valve can be improved.

[0018]

FIG. 1 is a longitudinal sectional view showing a main part of an embodiment of a motor-operated valve according to the present invention, and FIG. 4 and FIG.
The basic configuration and operation are the same as those of the conventional example shown in FIG. Therefore, FIG. 1 shows an embodiment of a main part of the motor-operated valve according to the present invention in which a part of the valve body is omitted. In the drawings, the same or equivalent parts as those in FIGS. The description is omitted here.

In FIG. 1, a bottom portion 30 of a gear case 20 '(gears in the gear case 20' are omitted in the drawing).
The output bearing 31 'and the valve body 32 provided on the
1, the output bearing 31 ′ is screwed with the holder 101, and the holder 101 and the valve body 32 are connected by a lock nut 42.

The valve shaft 25 is composed of a first valve shaft 251 and a second valve shaft 252, and the second valve shaft 252 is
1 is screwed to the holder 101 at the center. A deformed packing 102 is inserted between the output bearing 31 ′ and the holder 101 as a sealing material, and the deformed packing 102 is provided in a recess 311 of the output bearing 31 ′. The modified packing 102 seals the first valve shaft 251 and further seals between the holder 101 and the output bearing 31 '. A rubber packing 1 is provided between the holder 101 and the valve body 32.
04, a seal is secured by rubber compression, and the tip of the holder 101 is formed at the edge 101 ',
The seal portion 105 is formed by the edge portion, and the seal is secured. Thus, by tightening the lock nut 42, the edge portion is kept airtight. The first
The second valve shaft 251 and the second valve shaft 252 are connected to each other by a minus driver-like output transmission unit, and a minus driver shape 253 is formed on the first valve shaft 251.
52, a minus groove processing 254 is formed.

With this configuration, even if leakage occurs from the bellows 41, it is possible to prevent leakage of the refrigerant to the motor side or to the outside by the modified packing 102, and to prevent the refrigerant from leaking to the outside by the rubber compression and the edge seal portion 105. Leakage can be prevented.

FIG. 2 is a longitudinal sectional view showing a main part of another embodiment of the motor-operated valve according to the present invention. The basic structure and operation are the same as those of the conventional example shown in FIGS. The main difference from the conventional example is that a sealing material is provided. Therefore, FIG. 2 shows another embodiment of the main part of the motor-operated valve according to the present invention, in which a part of the valve body is omitted, and the same or equivalent parts as those in FIGS. Is omitted.

In FIG. 2, the lower part 2 of the gear case 20 '
The output shaft 25 is screwed into the output bearing 31 "which is press-fitted and fixed to 0", and the lower portion 20 "of the gear case 20 'and the valve body 32 are connected by a lock nut 42. The output bearing 3
1 ″ is a stepped portion 311 formed in a shape similar to a cylinder and extending downward and outward, and a stepped portion 312 forming a concave portion in an intermediate portion.
Are formed upwardly. Further, the step portion 311 is formed with a hanging portion 314 having a tip formed on the edge portion 108. The recess formed by the step 312 is provided with an O-ring 106, and the O-ring 106 seals between the output shaft 25 and the output bearing 31 ″. Ring 1
06 to prevent O-ring 106
It is provided below.

The distal end of the output bearing 31 "is formed at an edge portion 108, and a seal between the output bearing 31" and the valve body 32 is ensured by an edge seal portion 105 formed by the edge portion 108. And output bearing 31 "
And a rubber packing 104 is provided between them to secure a seal by rubber compression. It should be noted that securing the airtightness by compressing the edge seal portion 105 and the rubber by tightening the lock nut 42 is the same as the embodiment shown in FIG.

With this configuration, even if a crack occurs in the bellows 41 and a predetermined refrigerant leaks, the refrigerant can be prevented from leaking to the motor case 20 side or outside.

FIG. 3 is a longitudinal sectional view showing a main part of still another embodiment of the motor-operated valve according to the present invention. This embodiment is different from the embodiment shown in FIG.
4 shows the case where the seal between the output shaft 25 and the output bearing 31 "and the seal between the valve body 32 and the output bearing 31" are simultaneously secured. Therefore, only the configuration related to the seal is shown in the embodiment shown in FIG. 3, and the same or equivalent parts as those in FIG. 2 are denoted by the same reference numerals.

In FIG. 3, reference numeral 109 denotes a packing;
Is an output bearing. The output bearing 110 does not have a step 312 formed in the middle part of the output bearing 31 ″ shown in FIG. 2, but forms a step 111 that expands downward and has a packing 109 in a concave portion. A hanging portion 112 is formed below the bearing 110, and an edge portion 113 is provided at the tip thereof.
The seal between the output bearing 110 and the valve body 32 is ensured.

With this configuration, the space between the output shaft 25 and the output bearing 110 and the output bearing 1
Since the seal between 10 and the valve body 32 is simultaneously secured, even if the refrigerant leaks from the bellows 41 with a simple configuration, it is possible to prevent the refrigerant from leaking to the motor case 20 side or to the outside.

[0029]

As described above, according to the present invention,
In an electric valve using a valve body having a bellows in an airtight manner, a seal member is provided on an output shaft for driving the valve body, so even if refrigerant leaks from the bellows, the refrigerant leaks to the motor side. , And can be prevented from flowing out. Moreover, without significantly changing the configuration of the conventional motorized valve,
The outflow of the refrigerant can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a motor-operated valve according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a main part of a motor-operated valve according to another embodiment of the present invention.

FIG. 3 is a sectional view showing a main part of a motor-operated valve according to still another embodiment of the present invention.

FIG. 4 is a sectional view showing a schematic configuration of a conventional motor-operated valve.

FIG. 5 is a sectional view showing a main part of the electric valve shown in FIG. 4;

[Explanation of symbols]

 Reference Signs List 20 motor case 25 output shaft 31, 31 ', 31 "output bearing 41 bellows 101 holder 102 irregular packing 106 O-ring 109 packing

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Katsuhisa Kanno 7-17-24 Todoroki, Setagaya-ku, Tokyo F-Terminal Co., Ltd. F-term (reference) 3H062 BB28 CC01 FF40 HH04 3H066 AA07 BA19 DA01 DA11

Claims (5)

[Claims] 1. An output shaft supported by an output bearing to which rotation of a motor is transmitted via a gear, and one end of which contacts the output shaft,
A valve body having the other end airtightly provided with a bellows which comes into contact with and separates from a valve seat formed on the valve body, a holder for connecting the output bearing and the valve body, and a holder provided between the holder and the output bearing. A motor-operated valve, comprising: a sealing member provided to seal between the output shaft, the holder, and the output bearing with the sealing member. 2. The motor-operated valve according to claim 1, wherein the sealing material is a deformed packing. 3. An output shaft supported by an output bearing to which rotation of the motor is transmitted via a gear, and one end of the output shaft abutting against the output shaft,
The other end comprises a valve body airtightly provided with a bellows which comes into contact with and separates from a valve seat formed in a valve body, and a seal member provided in the output bearing. A motor-operated valve characterized by sealing between spaces. 4. The motor-operated valve according to claim 3, wherein said seal member is an O-ring. 5. The motor-operated valve according to claim 4, wherein said O-ring is supported by a washer.