WO2002059515A1

WO2002059515A1 - Actuator and valve device with the actuator

Info

Publication number: WO2002059515A1
Application number: PCT/JP2001/000545
Authority: WO
Inventors: Kouichi Sekine; Tomoyuki Haikawa
Original assignee: Yamatake Corporation
Priority date: 2001-01-26
Filing date: 2001-01-26
Publication date: 2002-08-01

Abstract

A valve device, comprising an actuator (10) and a ball valve (20) connected to the actuator (10), the actuator further comprising a housing (30) supporting an electric motor (40) and an output shaft (50), a joint (80) provided between the output shaft and a ball valve operating shaft (23), and a yoke (90) provided between the housing and the valve body (21), wherein the joint and yoke are formed of a material of small conductivity, the output shaft and operating shaft are held in the state of non-contact with each other by the joint, the housing and valve body are held in the state of non-contact with each other by the yoke, the joint and yoke function as insulating parts to satisfactorily insulate the actuator and ball valve, the entire surfaces of those portions of the output shaft and operating shaft disposed in a space surrounded by the yoke are covered by the joint to prevent condensation from occurring on the surface of shaft portions, the yoke covers the metal surface of the ball valve not covered with insulator to prevent a condensation from occurring on the ball valve, and an opening allowing air to circulate is provided in the yoke so as to suppress the accumulation of air in a yoke space and a thermal connection between the housing and the valve body through accumulated air.

Description

Specification

Yakuchi Yue and valve device provided with the same

The present invention relates to a valve device mounted on a fluid device and an actuator therefor, and more particularly to an actuator having excellent heat insulation performance between the valve and a valve device provided with the same. Background technology

In various fluid devices, a valve device for adjusting a flow rate of a fluid is used. The valve device includes a valve having a valve body disposed in the flow path, and an actuator connected to the valve shaft. The valve body and the actuator are connected to each other via a yoke, for example. I have. In this type of valve device, when a high-temperature fluid flows through the flow path, there is a problem that the heat is transmitted from the valve body heated by the high-temperature fluid to the actuator through the valve shaft and the yoke. Occurs. In order to solve such a problem, Japanese Unexamined Utility Model Publication No. 2-667888 discloses a "connection structure between a valve and an actuator and a yoke". A heat insulating member made of a material having a low thermal conductivity is interposed between the connecting portion of the valve and the connecting portion between the operating shaft of the valve and the operating shaft of the actuator. However, the connection structure described in the above-mentioned publication has a heat insulating member attached to each of the connection portion and the connection portion between the yoke and the yoke and the valve, so that the number of heat insulating parts is large and the manufacturing cost is high. And it takes time to assemble. Further, in this connection structure, a thin heat insulating member is used, and a sufficient heat insulating effect may not be obtained. When a valve device having such a connection structure is used in a fluid device through which a low-temperature fluid flows, such as cooling water for air conditioning, for example, the low-temperature fluid causes the valve element and a metal valve shaft integrated therewith to be formed. Cooled, valve operating shaft (valve shaft) Condensation occurs on the part of the operating shaft that is exposed to the atmosphere in the yoke internal space, especially the exposed part of the valve operating shaft that extends from the valve metal part. The problem described above is likely to occur. Further, in the case of a yoke structure in which air is likely to stay in the yoke interior space, the valve and the actuator are thermally coupled via the staying air (yoke portion). The heat dissipation is reduced), and the thermal coupling between the two is increased, and the heat insulation performance of the valve device is reduced. Disclosure of the invention

SUMMARY OF THE INVENTION An object of the present invention is to reduce the number of heat insulating parts for reducing the thermal coupling between the actuator and a driven device such as a valve, and to provide an actuator having an excellent heat insulating effect and an excellent heat insulation effect. It is an object of the present invention to provide a valve device that is also provided with dew condensation resistance at an exposed portion (a portion without heat insulating material).

Another object of the present invention is to provide an actuator that prevents dew condensation on a shaft portion disposed in a space surrounded by a casing connecting component such as a yoke, and a valve device including the same.

Another object of the present invention is to provide an actuator that prevents air from staying in a space surrounded by a housing connecting component, and a valve device including the same.

To achieve the above object, the present invention provides a power source for converting energy supplied from the outside into power, an output member for transmitting power provided from the power source to the outside, a power source, A housing that supports the output member, and the housing is connected to the driven device body so that the housing is interposed between the housing and the driven device body so that the housing does not directly contact the driven device body. In addition, a housing connecting member made of a low heat conductive material having a lower thermal conductivity than the material forming the driven device body, and an output interposed between the output member and the driven member of the driven device. An output member is connected to the driven member so that the member does not directly contact the driven member, and an output connecting member made of a low heat conductive material is provided.

According to the present invention, the housing of the actuator and the driven device main body are held in a thermally non-contact state by the housing connecting member interposed therebetween, and the output member and the driven member of the actuator are connected. Are kept in a thermally non-contact state by the output connecting member interposed therebetween, so that heat conduction between these elements is suppressed, and the heat insulation between the actuator and the driven device is improved. Increase. In particular, in the case of the present invention, the entire housing connecting member and the entire output connecting member are made of a material having a low thermal conductivity. Compared with the conventional structure in which a thin heat insulating member is attached to each of the connecting portions between the connecting member and the driven device, the heat insulating property between the actuator and the driven device is excellent. Also, the number of heat insulating parts for insulating the actuator and the driven device is reduced.

In the present invention, preferably, the output connection member covers most of the surface of a portion of the driven member disposed in the space surrounded by the housing connection member. According to this preferred aspect, even when the driven member covered by the output connecting member is cooled to a temperature lower than the dew point of the air in the space, dew condensation on the surface of the driven member is suppressed. Is done. Also, the output member is thermally isolated from the driven member by the output connecting member made of a low heat conductive material, and the temperature of the surface of the portion of the output member arranged in the space exceeds the dew point, and Dew condensation on the surface is suppressed. In addition, by covering the surface of the output member with the output connecting member, the dew condensation can be further prevented or suppressed.

In the present invention, preferably, the surface of a portion of the driven device (for example, a valve) that is not covered with the heat insulating material is covered with a housing connecting member (or a housing connecting member and an output connecting member). According to this preferred aspect, even when the driven device is cooled to a low temperature, dew condensation on the surface of the metal part of the driven device can be suppressed.

Preferably, the housing connecting member is provided with an opening through which air can flow. According to this preferred aspect, the stagnation of air in the space surrounded by the housing connecting member is suppressed, the heat dissipation of the housing connecting member and the output connecting member is enhanced, and the air in the space is interposed. Thermal coupling between the housing and the driven device body is weakened. Therefore, when the driven member of the driven device is heated by the high-temperature fluid, heating of the housing due to heat transfer from the driven device via air and heating of the components inside the housing are suppressed. Further, when the driven device body is cooled to a temperature lower than the dew point of the air in the space and dew forms on the surface of the output connecting member, the inside of the space is opened through the opening of the housing connecting member. The circulating air promotes the drying of the dew.

Preferably, the housing and the housing connecting member are formed into a body using a low heat conductive material. According to this preferred embodiment, since the housing and the housing connecting portion are integrally formed, the manufacturing cost of the actuator is reduced. According to another aspect of the present invention, there is provided a valve device comprising the above-mentioned actuary and a driven device connected thereto, wherein the driven device is a valve for controlling a fluid flow rate. . According to the valve device of the present invention, the same advantages as the advantages obtained by Actuate can be obtained. Brief explanation of drawings

FIG. 1 is a longitudinal sectional view showing a valve device according to an embodiment of the present invention, and

FIG. 2 is an exploded perspective view showing a valve device according to a modification of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, a valve device according to an embodiment of the present invention provided in a fluid device will be described with reference to the drawings.

As shown in FIG. 1, the valve device includes an actuator 10 and a pole valve (driven device) 20 connected thereto, and the valve opening of the valve 20 is adjusted by the actuator 10. Thus, the flow rate of the fluid flowing through a fluid device (not shown) is controlled.

The case 10 is composed of a synthetic resin housing (housing) 30 composed of a case 31 and a cover 32 attached to the case 31, and a first metal case extending horizontally in the housing 30. Metal that extends in the height direction through the electric motor (power source) 40 mounted on the plate 33, the first plate 33, and the second plate (the bottom wall of the case 31) 34 Output shaft (output member) 50, and the output shaft 50 has two flange portions that respectively contact the first and second plates 33, 34, and can be rotated by both plates. It is supported so that it cannot move in the axial direction. A reduction mechanism 60 is disposed between the plates 33 and 34, and transmits the rotational force of the motor 40 to the output shaft 50 via the reduction mechanism 60. In FIG. 1, reference numeral 33 denotes an electric wire through hole formed in the housing case 31, and a power supply line (not shown) is introduced into the housing 30 through the electric water through hole 33, so that a motor is not provided. In the evening, one side of the power line is connected. The other side of the power supply line is connected to a power supply via an external controller (not shown). Also, in the housing 30 For example, two limit switches (not shown) are arranged facing the actuator output shaft 40, and the signal lines (not shown) connected to both limit switches are sent to the controller through the electric wires 揷 through holes 33. It is connected. That is, the controller controls the driving of the motor 30 in accordance with the detection signal indicating the rotation position of the output shaft 40.

Now, in the valve device, the reduction mechanism 60 includes, for example, a gear train including eight gears, and first, second, and third fixed shafts 60 a, 60 b, extending in parallel with the output shaft 50, respectively. 60 c, and both ends of each fixed shaft are fixed to plates 33, 34. More specifically, the first gear 61 is single-coupled to the output shaft 50 so as to be able to rotate integrally therewith, and meshes with the second gear 62. The second gear 62 and the third gear 63 integral therewith are mounted on the first fixed shaft 60a so as to be rotatable therearound. The second gear 62 and the third gear 63 are rotatable around the first fixed shaft 60a. It is supported so that it cannot move in the axial direction. The fourth and fifth gears 64, 65 are rotatably and axially mounted on the second fixed shaft 60b, and are interposed between the first plate 33 and the fifth gear 65. The biasing force of the applied coil spring 69 is constantly pressed against the second plate 34 so that the fourth gear 64 normally engages with the third gear 63. The sixth and seventh gears 66, 67 are mounted on the third fixed shaft 60c so as to be rotatable and immovable in the axial direction. The sixth gear 66 always engages with the fifth gear 65 movable along the second fixed shaft 60 Ob, and the seventh gear 67 rotates the motor 40 It engages with an eighth gear 68 fixed to the shaft 41.

The engagement between the third gear 63 and the fourth gear 64 can be released by manually operating the operation shaft 71 of the manual operation part 70. That is, the operation shaft 71 extends through the second plate 34 and includes an enlarged diameter portion 72 and an operation knob 73 arranged facing the fifth gear 65. I have. In this manual operation unit 70, the enlarged diameter part 72 is normally held at a position separated from the fifth gear 65 by the spring force of the coil spring 74, but the operation knob 73 is moved to the coil spring When the gear is moved upward against the spring force of 4, the fourth and fifth gears 64, 65 move upward along the second fixed shaft 60b to the position shown by the two-dot chain line in FIG. The fourth gear 64 is disengaged from the third gear 63.

On the other hand, the output shaft 50 of the actuator 10 is connected via the speed reduction mechanism 60 as described above. It is drivingly connected to a motor 40 and, on the other hand, is connected to a poll valve 20 via a joint (output connecting member) 80.

The pole valve 20 includes a metal valve body 21 in which a flow path is formed, and a cylindrical metal support stay 22 formed integrally therewith. The support stay 22 is connected to the flow path from the valve body 21 to the flow path. It extends substantially orthogonally. An operation shaft 23 made of metal is arranged in the support stay 22, and a valve body 24 in the form of a pole is arranged in the flow path of the valve body 21. The valve body 24 is made of metal and is drivingly connected to the motor 40 via the operation shaft 23, the joint 80, the output shaft 50, and the reduction mechanism 60, and is rotationally driven by the motor 40 rotation. To regulate the fluid flow rate.

A yoke (housing connecting member) 90) is attached to the bottom surface of the housing 30 using screws as shown in the figure, and the housing 30 and the pole valve 20 are connected via the yoke 90. . The yoke 90 is fixed to a flange 22a provided on a support stay 23 of the pole valve 20 by screws as shown in the figure. In this manner, the yoke 90 is interposed between the housing 30 and the pole valve support stay 23 (broadly speaking, the pole valve body 21), whereby the housing 30 and the support stay 23 (valve body 21) are connected. They are kept out of direct contact with each other.

In the present embodiment, the yoke 90 is made of a synthetic resin material having a lower thermal conductivity than the metal material forming the support stay 22 (valve body 21), and has an excellent heat insulating effect.

Table 1 exemplifies constituent materials and thermal conductivity of main parts of the valve device of the present embodiment. Name Constituent material Thermal conductivity (W / m · K) Yoke 90 PPS + GF 10% 0.39

Housing 30 P P + GF 20% 0.21 to 0.22 Output shaft 50 Stainless steel 16.3

Valve body 21 Bronze 25. 6

Operating axis 23 Stainless steel 16.3 In Table 1, the symbols PC, PPS, and GF represent polypropionate, polyphenylene sulfide, and glass fiber, respectively. The housing 30 is made of a material obtained by adding 20 parts by weight of glass fiber to 100 parts by weight of polycarbonate, and the yoke 90 is made of glass with 100 parts by weight of polyphenylene sulfide. It is composed of a material to which 10 parts by weight of fiber is added.

However, in the present invention, the yoke 90 can be made of a material having a lower thermal conductivity than the material of the housing 30 or the material of the valve body 21. Further, as shown in FIG. 2, the yoke 90 may be formed integrally with the housing 30 to further reduce the cost. In this case, the housing 30 and the housing 90 are made of the same material having the same or lower thermal conductivity than the material of the valve body 21. For high-temperature applications, heat-resistant materials should be selected as the resin material used to form the yoke, etc., in order to maintain mechanical strength. A thermosetting type such as epoxy can also be used.

Further, the yoke 90 of the present embodiment is made of a plate material having a U-shaped cross section, as in the case of the modification shown in FIG. In other words, the yoke 90 has openings on both sides (one of which is indicated by reference numeral 91 in FIG. 2), and allows air to flow through these openings.

As described above, a joint (output connecting member) 80 is interposed between the output shaft 50 of the actuator 10 and the operating shaft (valve shaft) 23 of the pole valve 20. Thus, the output shaft 50 of the actuator 10 and the operation shaft 23 of the pole valve 20 are connected so as not to directly contact each other. In this embodiment, from the viewpoint of reducing the thermal coupling between the actuator output shaft 50 and the pole valve operating shaft 23, the joint 80 is made of a synthetic resin having a low thermal conductivity. . Also, the joint 80 covers the entire surface of the portions 50 a and 23 a of the actuator output shaft 50 and the pole valve operating shaft 23 disposed in the yoke internal space, The prevention of dew condensation is achieved.

Also, as shown in FIG. 1, the entire valve body 21 and most of the support stays 22 are covered with a heat insulating material 26, and the piping 25 connected to the pole valve 20 is insulated. It is arranged in timber 26. And the surface of the part of the pole valve 20 that is not covered with the heat insulating material 26 Is covered by a joint 80 and a yoke 90 so as not to come into direct contact with the atmosphere. A flat mounting portion 50b is formed at the upper end of the output shaft 50. The output shaft 50 is manually rotated with a spanner or a wrench (not shown) applied to the flat mounting portion 50b, so that the pole valve 2 is formed. The opening degree of the valve body 24 of 0 can be adjusted.

In the modified example shown in FIG. 2, a handle 81 is formed at the joint 80 and protrudes from the opening 91 of the yoke 90, so that a spanner or a wrench is not required at the time of manual opening / closing operation. The upper end of the output shaft is accommodated in the housing 30 without protruding from the cover 32 to the outside. In this modification, four projections formed on the lower surface of the yoke 90 are fitted into four holes provided in the flange 22a, and then the attachment ring 1 placed in the yoke 90 is mounted. Then, the yoke 90 is fixed between the attachment ring 100 and the flange 22 a by screwing the screw 0 2 and the thread portion 2 2 b of the stay 22. At this time, the tip 50 a of the output shaft 50 of the actuator is fitted into the square hole at the top of the joint 80, and the tip of the operating shaft 23 of the pole valve 20 into the square hole (not shown) at the bottom of the joint. It fits.

Hereinafter, the operation of the valve device shown in FIG. 1 will be described.

When the motor 40 is rotated by supplying power to the motor 40 of the actuator 10, the rotation of the motor is reduced by the speed reduction mechanism 60 and the rotation torque is increased. It is transmitted to the operation shaft 23 of the pole valve 20 via the output shaft 50 of the actuator 10 and the joint 80, and the valve body 24 integral with the operation shaft 23 rotates to produce the pole valve 20. Is adjusted.

In this embodiment, the pole valve 20 is opened and closed. When the output shaft 50 rotates to a rotation position corresponding to the fully closed state of the pole valve 20, the fully closed state is set by a limit switch (not shown). This detection operation is further detected by a controller (not shown), and the motor 40 is stopped under the control of the controller to maintain the pole valve 20 in the fully closed state. When the output shaft 50 rotates to a rotational position corresponding to the fully opened state of the pole valve 20, the fully opened state is maintained in the same manner as in the above case. If necessary, the amount of rotation of the motor 40 can be variably controlled so that the valve opening of the pole valve 20 can be variably controlled between the fully closed state and the fully opened state. Then, in case of power failure or other reasons, the pole valve 20 can be manually opened and closed if necessary. In this case, the operator moves the operation knob 73 of the manual operation part 70 upward to release the engagement between the third gear 63 and the fourth gear 64 of the reduction mechanism 60, and The output shaft 50 is rotated by rotating a wrench or wrench on the flat mounting portion 50b of the output shaft 50, thereby opening or closing the pole valve 20. After the manual opening and closing operation of the pole valve 20 is completed, when the operator releases the operation knob 73, the fourth and fifth gears 64, 65 are normally driven by the spring force of the coil spring 69. And the fourth gear 64 engages with the third gear 63 again.

The valve device of the present embodiment operates as described above, and is used for controlling a fluid flow rate in various fluid devices. As described above, in the conventional valve device, the heat insulating performance between the valve and the actuator is not sufficient, and air easily stays in the yoke internal space. When the valve element is heated or cooled, the actuator is heated or cooled, or condensation forms on the surface of the shaft (particularly the valve metal part) of the output shaft of the valve operating shaft, which is exposed in the yoke interior space. This may cause a malfunction.

In this regard, the valve device of the present embodiment has a high heat insulation performance between the pole valve 20 and the actuator 10, the yoke 90 allows air to flow well, and furthermore, the joint 80 and the bow The contact 90 prevents the valve metal part from contacting the atmosphere, and the above-mentioned problems are eliminated or greatly suppressed. That is, in the valve device of the present embodiment, both the joint 80 and the shock 90 are made of a synthetic resin material having a low thermal conductivity, so that the pole valve 20 and the housing 30 are thermally isolated and the pole The valve operating shaft 23 is thermally isolated from the actuator output shaft 50, and an opening 91 is provided in the yoke 90 to allow air to flow through the yoke. Valve metal parts including 23 are shielded from the atmosphere. Therefore, even when the high-temperature fluid of the pole valve 20 flows, the actuator 100, especially the motor 40 and the output shaft 50 are not heated, and the low-temperature fluid flows through the pole valve 20. Also in this case, the reactor 10 is not cooled, or the dew condensation does not occur on the surface of the pole valve operating shaft 23 or the reactor output shaft 50. In addition, If 10 is placed under high or low temperature, the pole valve 20 will not be heated or cooled.

Moreover, in the present embodiment, the entire joint 80 and the entire yoke 90 are made of a synthetic resin material. In other words, the heat insulating parts that insulate the actuator and the pole valve mainly include the joint 80 and the yoke. Therefore, the number of heat-insulating parts is greatly reduced as compared with the conventional apparatus in which thin-plate heat-insulating parts are arranged at various places. To prevent the valve metal part from being exposed, only one mouth attachment is required.

For this reason, assembly of the valve device is facilitated, and costs are reduced.

The present invention is not limited to the above embodiment, and can be variously modified.

For example, in the above embodiment, the power source for the actuator is an electric motor, but another power source such as a pneumatic cylinder may be used instead. That is, the actuators may be electric or pneumatic, and may be rotary or linear. In the above embodiment, the pole valve is used as the driven device driven by the actuator. However, another rotary valve may be used, or a linear valve may be used.

Claims

The scope of the claims

1. A power source (40) that converts externally supplied energy into power,

An output member (5 0) for transmitting the power from the power source to the outside, and a housing (30) for supporting the power source and the output member.

The housing is interposed between the housing and the main body (2 1) of the driven device (2 0), and the housing is connected to the driven device such that the housing does not directly contact the driven device main body. A housing connecting member (90) which is connected to the main body, and is made of a material having a lower thermal conductivity than a material forming the driven device main body;

The output member is interposed between the output member and the driven member (23) of the driven device (20) so as to keep the output member out of direct contact with the driven member. And an output connection member (80) connected to the driven member and made of a low heat conductive material.

2. The output connection member according to claim 1, wherein the output connection member covers most of the surface of a portion of the driven member disposed in a space surrounded by the housing connection member. The night of Akuchi Yue.

3. The actuator according to claim 1, wherein the housing connecting member covers a metal surface of a portion of the driven device that is not covered with a heat insulating material.

4. The actuator according to claim 1, wherein the casing connecting member is provided with an opening through which air can flow.

5. The housing and the housing connecting member are integrally formed using the same material having a lower thermal conductivity than a material forming the driven device main body. Item 1. Item 2, Item 3 or Item 4.

6. The apparatus according to claim 1, comprising an actuator (10) and a driven device (20) connected thereto, wherein the driven device is a valve for controlling a fluid flow rate. Special valve device.

7. The output connection member of the actuator covers most of a surface of a portion of the driven member disposed in a space surrounded by the housing connection member. 7. The valve device according to claim 6, wherein

8. The valve device according to claim 6, wherein the housing connecting member covers a metal surface of a portion of the driven device that is not covered with a heat insulating material.

9. The valve device according to claim 6, wherein an opening through which air can flow is provided in the housing connecting member of the actuator.

10. The casing and the casing connecting member of the actuator are integrally formed by using the same material having a lower thermal conductivity than the material constituting the driven device main body. 10. The valve device according to claim 6, 7, 8, or 9, wherein:

11. The valve device according to claim 6, wherein a metal part of the driven device, which is not covered with a heat insulating material, is covered by the housing connecting member so as not to directly contact the atmosphere.

12. The metal part of the driven device, which is not covered with a heat insulating material, is covered with the housing connecting member and the output connecting member so as not to be directly exposed to the atmosphere. Item 2. The valve device according to item 1.