CN114562602A - Electric valve - Google Patents

Abstract

The present invention provides an electric valve which uses a main valve body to make a main valve port in a fully closed state, and uses a port throttle portion formed between a sub valve port of the main valve body and the sub valve body to allow fluid to flow in and out. The flow control in the small flow control area obtains the good operability of the sub spool. The auxiliary valve body (4) is provided with a guide boss (41) inserted into the auxiliary valve chamber (3R). A high lubricity guide member (10) with which the guide bosses (41) are in sliding contact is disposed between the inner circumference of the sub-valve chamber (3R) and the outer circumference of the guide bosses (41). The fluid flowing into the main valve chamber (1R) is made to flow from the communication passage (3b) to the inside of the high lubricity guide member (10). The guide bosses (41) are easily slid (moved up and down) in the high lubricity guide member (10). The generation of noise and vibration of the electric valve (100) is suppressed.

Description

Electric valve

technical field

The present invention relates to an electric valve.

Background technique

Today, there are electric valves for flow control in small flow control areas and large flow areas. Such an electric valve is disclosed in, for example, Japanese Patent Application Laid-Open No. 2020-56472 (Patent Document 1).

FIG. 9 is a vertical cross-sectional view of the same conventional electric valve described above. In this conventional electric valve, the sub valve body b is arranged in the sub valve chamber a1 inside the main valve body a. The sub valve body b has a guide boss b1 and a needle valve b2. Further, the sub valve body b is formed at the lower end of the rotor shaft c1 of the drive portion c. The drive part c is provided with the screw feed mechanism c2, and by rotating the rotor shaft c1, the sub spool b moves up and down inside the main spool a. Thereby, the needle valve b2 controls the opening degree of the secondary valve port a2.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2020-56472

SUMMARY OF THE INVENTION

The problem to be solved by the invention

In the structure of the conventional electric valve described above, the guide boss b1 of the sub-valve b moves up and down while being guided by the inner periphery of the sub-valve chamber a1 of the main valve body a. The guide portion has a function of suppressing movement in the radial direction so that the needle valve b2 of the sub-valve b does not interfere with the sub-valve port a2 more than necessary. However, since the guide boss b1 of the sub valve body b and the main valve body a slide between metals, there is a possibility that the operability may be impaired due to wear and the like.

The subject of the present invention is to control the fluid in a small flow rate control region by using the main valve body to fully close the main valve port and to use the port throttle portion formed between the sub valve port and the sub valve body of the main valve body. In the electric valve of the high flow control, the good operability of the sub spool is obtained.

solutions to problems

The electric valve of the present invention includes a main valve body and a sub valve body, the main valve body is provided in a main valve chamber of the valve body, and opens and closes a main valve port opening to the main valve chamber, and the sub valve body is formed in the main valve chamber. The sub-valve chamber of the main valve body is moved in the axial direction of the sub-valve port formed in the main valve body to control the opening degree of the sub-valve port, and the electric valve is formed with a communication from the main valve chamber to the sub-valve chamber. The communication passage has a small flow control region, in which the main valve port is closed by the main valve body, and the port throttle portion of the gap between the needle valve of the sub valve body and the sub valve port The fluid flowing into the sub-valve chamber via the communication passage is throttled, and the electric valve is characterized in that the sub-valve body is provided with a guide boss arranged in the sub-valve chamber, on the inner periphery of the sub-valve chamber. A highly lubricity guide member that is in sliding contact with the guide boss portion is provided between the guide boss portion and the outer periphery of the guide boss portion.

In this case, it is preferable that the electric valve is characterized in that the high lubricity guide member has a cylindrical portion separated from the inner periphery of the sub-valve chamber, and the communication passage is opened in a communication space around the cylindrical portion.

Furthermore, it is preferable that the electric valve is characterized in that the cylindrical portion of the high lubricity guide member surrounds the needle valve of the sub valve body.

Furthermore, it is preferable that the electric valve be characterized in that a sub-valve housing chamber for accommodating the sub-valve is formed inside the high lubricity guide member, and a sub-valve accommodating chamber extending from the communication space around the cylindrical portion to the sub-valve is formed. The storage chamber is a flow path extending in the axial direction.

The effects of the invention are as follows.

According to the electric valve of the present invention, since the high lubricity guide member with which the guide bosses slide in contact is provided between the inner circumference of the sub valve chamber and the outer circumference of the guide bosses, when the sub valve body moves up and down, the sub valve body moves up and down. The guide bosses of the valve body are easily slid in the high lubricity guide member, the generation of operating noise and vibration of the electric valve can be suppressed, and good workability of the sub valve body can be obtained.

Description of drawings

1 is a vertical cross-sectional view of a state of a small flow rate control region of an electric valve according to a first embodiment of the present invention.

2 is a vertical cross-sectional view of the electric valve according to the second embodiment of the present invention in a state of a small flow rate control region.

3 is a vertical cross-sectional view of the electric valve according to the third embodiment of the present invention in a state of a small flow rate control region.

4 is a vertical cross-sectional view of the electric valve according to the fourth embodiment of the present invention in a state of a small flow rate control region.

5 is a vertical cross-sectional view of the electric valve according to the fifth embodiment of the present invention in a state of a small flow rate control region.

6 is a vertical cross-sectional view of the electric valve according to the sixth embodiment of the present invention in a state of a small flow rate control region.

7 is a vertical cross-sectional view of the electric valve according to the seventh embodiment of the present invention in a state of a small flow rate control region.

8 is a vertical cross-sectional view of the electric valve according to the eighth embodiment of the present invention in a state of a small flow rate control region.

9 is a vertical cross-sectional view of the electric valve according to the ninth embodiment of the present invention in a state of a small flow rate control region.

FIG. 10 is an enlarged cross-sectional view of a main part of a conventional electric valve.

In the picture:

1—Valve shell, 1R—Main valve chamber, 11—First joint pipe, 12—Second joint pipe, 13—Main valve seat, 13a—Main valve port, L—Axis, 2—Support member, 23a—Internal thread part, 3—main valve core, 31—main valve part, 32—sub-valve inner package, 3a—sub-valve port, 3b—communication path, 3c—communication path, 3R—sub-valve chamber, 3R1—communication space, 3R2— Auxiliary valve core storage chamber, 4—Auxiliary valve core, 41—Guiding boss, 42—Needle valve, 5—Stepping motor, 51—Rotor shaft, 51a—External thread, 52—Magnetic rotor, 53—Stator Coil, 4'—Auxiliary valve core, 41'—Protruding part for guiding, 43'—Flange part, 4a'—Expansion space, 4"—Auxiliary valve core, 41"—Protruding part for guiding, 10—High Lubricity guide parts, 20—High lubricity guide parts, 30—High lubricity guide parts, 40—High lubricity guide parts, 50—High lubricity guide parts, 60—High lubricity guide parts, 70—High lubricity guide parts Guide parts, 80—high lubricity guide parts, 90—high lubricity guide parts, 100—electric valve.

Detailed ways

Hereinafter, embodiments of the electric valve of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a state of a small flow rate control region of an electric valve according to the first embodiment. In addition, the concept of "up and down" in the following description corresponds to the up and down in the drawing of FIG. 1 . The electric valve 100 includes a valve housing 1 , a support member 2 , a main valve body 3 , a sub valve body 4 , and a drive unit 5 .

The valve housing 1 is formed in a substantially cylindrical shape, for example, of brass, stainless steel, or the like, and has a main valve chamber 1R inside the valve housing 1 . A first joint pipe 11 that conducts with the main valve chamber 1R is connected to one side of the outer periphery of the valve housing 1 , and a second joint pipe 12 is connected to a cylindrical portion extending downward from the lower end. In addition, a main valve seat 13 is formed on the main valve chamber 1R side of the second joint pipe 12 of the valve housing 1, and the inner side of the main valve seat 13 becomes the main valve port 13a. The main valve port 13a is a cylindrical hole centered on the axis L, and the second joint pipe 12 is communicated with the main valve chamber 1R via the main valve port 13a. In addition, in the present embodiment, the main valve seat 13 is formed integrally with the valve housing 1, but the valve seat member having the main valve port may be provided separately from the valve housing, and the valve seat member may be assembled to the valve housing. Way.

The support member 2 is attached to the opening of the upper end of the valve housing 1 . The support member 2 includes: a fitting portion 21 fitted into the inner peripheral surface of the valve housing 1 ; upper and lower substantially cylindrical guide portions 22 located inside the fitting portion 21 ; and a bracket extending from the upper portion of the guide portion 22 . part 23 ; and an annular fixed metal fitting 24 which is provided on the fitting part 21 and protrudes from the outer periphery of the fitting part 21 and is formed of a metal plate. The fitting portion 21 , the guide portion 22 , and the bracket portion 23 are formed as a single piece made of resin, and the fixing metal fitting 24 is integrally provided with the fitting portion 21 made of resin by insert molding. Alternatively, the fitting portion 21 of the support member 2 may be press-fitted into the valve housing 1 .

Further, in the center of the bracket portion 23 of the support member 2, a female screw portion 23a and its screw hole coaxial with the axis L are formed, and a shaft guide hole 23b connected to the screw hole of the female screw portion 23a is formed. There is a cylindrical slide hole 23c having a diameter larger than the inner circumference of the shaft guide hole 23b. In addition, a cylindrical rod-shaped rotor shaft 51 is disposed in the screw hole of the female screw portion 23a and the shaft guide hole 23b. A male screw portion 51 a is formed on the outer circumference of the rotor shaft 51 , and the male screw portion 51 a is screwed to the female screw portion 23 a of the bracket portion 23 .

The outer periphery of the bracket portion 23 is formed with a male lead thread 231 composed of a helical protrusion, and a lower end stopper 232 protruding in the radial direction is formed on the lower end of the male lead thread 231 . An upper end stopper 233 is formed on the outer peripheral edge of the upper end portion. In addition, a coil-shaped driven slider 234 is screwed to the outer periphery of the guide male thread 231 . The driven slider 234 rotates in the same direction along with the rotation of the magnetic rotor 52 to be described later, and moves in the same direction (up and down) as the rotor shaft 51 along the guide male thread 231 . Then, the lower end stopper 232 or the upper end stopper 233 is brought into contact with the driven slider 234 , thereby restricting the vertical stop position of the magnetic rotor 52 .

The main valve body 3 includes a main valve portion 31 that is seated and disengaged with respect to the main valve seat 13 , and a sub-valve inner portion 32 that is a side wall of the main valve body 3 and that includes the sub-valve 4 . A columnar opening 3A is formed inside the main valve portion 31 , and a columnar sub-valve chamber 3R is formed inside the sub-valve inner package portion 32 . Furthermore, between the main valve portion 31 and the sub-valve inner casing portion 32 , a cylindrical sub-valve port 3 a is formed centering on the axis L and opening from the sub-valve chamber 3R to the opening 3A side.

A communication passage 3b that communicates from the main valve chamber 1R to the sub-valve chamber 3R in the direction intersecting the axis L is formed on the side surface of the sub-valve inner casing 32 of the main valve body 3 . In this embodiment, a plurality of (for example, four) communication passages 3b are radially formed at positions rotationally symmetric around the axis L. In addition, the main valve body 3 has a stopper 34 at the upper end of the sub-valve inner casing 32, and has a main valve spring 35 between the stopper 34 and the upper end of the guide hole 2A of the support member 2, and the main valve The spring 35 urges the main valve body 3 in the direction (closing direction) of the main valve seat 13 . In addition, a muffler member 36 is disposed inside the opening 3A of the main valve portion 31 . It should be noted that the communication passage 3b is not limited to the form in which a plurality of communication passages 3b are radially formed at rotationally symmetric positions, and the number of communication passages 3b may be one, or a plurality of communication passages 3b may be formed at unequal intervals.

The sub spool 4 is formed at the lower end portion of the rotor shaft 51 . In addition, the sub spool 4 is formed integrally with the rotor shaft 51 . The auxiliary valve body 4 is composed of a guide boss 41 and a needle valve 42 . In addition, the tip of the needle valve 42 of the sub-valve 4 is inserted into the sub-valve port 3a in the direction of the axis L, so that a small amount of fluid flows through the gap between the needle valve 42 and the sub-valve port 3a, that is, the port throttle portion for small flow control. An annular gasket 43 made of lubricating resin is disposed on the upper end of the guide boss 41 of the sub-valve 4 , and the guide boss 41 is disposed inside the sub-valve inner package 32 . Further, between the inner circumference of the sub-valve chamber 3R and the outer circumference of the guide boss portion 41 , a highly lubricity guide member 10 that is in sliding contact with the guide boss portion 41 is disposed. In addition, the sub spool 4 and the rotor shaft 51 may be formed independently of each other, and these may be assembled together.

An airtight case 55 is airtightly fixed to the upper end of the valve housing 1 by welding or the like. Inside the airtight case 55, a magnetic rotor 52 whose outer peripheral portion is magnetized to multiple poles and a rotor shaft 51 fixed to the center are provided. In addition, the stator coil 53 is arranged on the outer periphery of the airtight case 55 , and the magnetic rotor 52 , the rotor shaft 51 , and the stator coil 53 constitute the stepping motor 5 . Then, by applying a pulse signal to the stator coil 53, the magnetic rotor 52 rotates according to the number of pulses, and the rotor shaft 51 rotates.

According to the above configuration, when the stepping motor 5 is driven, the magnetic rotor 52 and the rotor shaft 51 are rotated, and the rotor shaft 51 and the magnetic rotor 52 are moved in the direction of the axis L by the screw feeding mechanism of the male screw portion 51a and the female screw portion 23a. move. Then, the sub-valve 4 moves forward and backward in the direction of the axis L, so that the needle valve 42 of the sub-valve 4 approaches or separates from the sub-valve port 3a. Then, when the sub spool 4 rises, the gasket 43 is engaged with the stopper 34 of the main spool 3 (the upper end position of the sub valve), the main spool 3 and the sub spool 4 move together, and the main valve of the main spool 3 The portion 31 is disengaged from the main valve seat 13 . Thereby, the main valve port 13a is fully opened, and a large flow rate region state is obtained.

The high lubricity guide member 10 has a cylindrical shape matching the inner surface of the sub-valve chamber 3R of the main valve body 3 , and is provided at the bottom of the interior of the sub-valve chamber 3R. Furthermore, in this high lubricity guide member 10 , a communication passage 10 a is formed at a position facing the communication passage 3 b of the main valve body 3 . In the state of the small flow control region shown in FIG. 1 , the main valve port 13 a is closed when the main valve body 3 is seated on the main valve seat 13 , and the opening degree of the sub valve port 3 a is controlled by the needle valve 42 of the auxiliary valve body 4 , Control small flow. At this time, the fluid flowing into the main valve chamber 1R from the first joint pipe 11 flows to the sub valve chamber 3R through the communication passage 3b of the main valve body 3 and the communication passage 10a of the high lubricity guide member 10 .

Further, the high lubricity guide member 10 is made of a polyphenylene sulfide resin (PPS resin) containing a fluororesin, or a metal coated with a high lubricity such as a fluororesin. Therefore, the high-lubricity guide member 10 has high lubricity, and when the sub-valve 4 moves up and down, the guide bosses 41 of the sub-valve 4 easily slide inside the high-lubricity guide member 10, and the electric valve 100 can be suppressed from being slid. The operating sound and vibration are generated, and the good workability of the auxiliary valve body 4 can be obtained.

2 is a cross-sectional view of a main part of an electric valve according to a second embodiment of the present invention. In addition, in the following second to eighth embodiments, other parts other than the main parts shown in the figure are the same as those in FIG. 1 of the first embodiment. In addition, in each of the following embodiments, the same members and the same elements as those in the first embodiment are denoted by the same reference numerals and detailed descriptions thereof are omitted. This second embodiment is different from the first embodiment in the structures of the high lubricity guide member 20 and the sub-valve 4'.

The sub-valve 4' includes a guide boss 41' thinner than the guide boss 41 of the first embodiment and a needle 42' longer than the needle 42 of the first embodiment. Further, between the inner circumference of the sub-valve chamber 3R and the outer circumference of the guide boss portion 41 ′, a highly lubricity guide member 20 , which is in sliding contact with the guide boss portion 41 ′, is disposed. Moreover, the high lubricity guide member 20 has the cylindrical part 20b which penetrates the needle valve 42', and forms a clearance gap around the needle valve 42'. The outer diameter of the cylindrical portion 20b is smaller than the inner diameter of the sub-valve inner portion 32, and a communication space 3R1 as a part of the sub-valve chamber 3R is formed over the entire circumference between the cylindrical portion 20b and the sub-valve inner portion 32. Further, inside the high lubricity guide member 20, a sub-valve housing chamber 3R2, which is a part of the sub-valve chamber 3R for housing the sub-valve 4', is formed, and a main valve body is formed at a position outside the cylindrical portion 20b. The upper part of the communication passage 3b of the valve body 3 is a communication passage 20a that communicates the communication space 3R1 with the sub-valve housing chamber 3R2. Thereby, the fluid flowing into the main valve chamber 1R from the first joint pipe 11 flows into the communication space 3R1 through the communication passage 3b of the main valve body 3, and is received from the communication passage 20a of the high lubricity guide member 20 through the sub valve body The gap between the cylindrical portion 20b in the chamber 3R2 and the needle valve 42' flows to the side of the secondary valve port 3a. Since the communication space 3R1 is formed over the entire circumference around the axis L, regardless of the rotational position of the high lubricity guide member 20, the communication passage 3b of the main valve body 3 can communicate with the communication passage 20a via the communication space 3R1. In addition, in the second embodiment, the guide bosses 41 ′ are easily slid in the high lubricity guide member 20 , the generation of operating noise and vibration of the electric valve 100 can be suppressed, and the auxiliary valve body 4 ′ can be obtained. good workability.

In addition, since the cylindrical portion 20b surrounds the needle valve 42' of the sub-valve 4', the needle valve 42' is less affected by the dynamic pressure of the fluid flowing out from the communication passage 3b of the main valve body 3, and the needle valve 42 can be prevented from ' vibration. Therefore, the flow rate of the fluid flowing through the secondary valve port 3a is stabilized. After the fluid passes through the communication passage 3b (horizontal hole) of the main valve body 3, the flow passage is bent in the direction of the axis L by the communication passage 20a (flow passage) extending in the direction of the axis L, so that the flow velocity decreases. Thereby, the flow velocity of the fluid flowing into the sub-valve housing chamber 3R2 inside the high lubricity guide member 20 is also reduced, so even if the fluid collides with the sub-valve 4', the sub-valve 4' can be suppressed from vibrating.

3 is a cross-sectional view of a main part of an electric valve according to a third embodiment of the present invention. The sub valve body 4' of the third embodiment is the same as that of the second embodiment. Further, between the inner circumference of the sub-valve chamber 3R and the outer circumference of the guide boss portion 41 ′, a highly lubricity guide member 30 , which is in sliding contact with the guide boss portion 41 ′, is disposed. The high lubricity guide member 30 is formed with a communication passage 30 a facing the inner periphery of the sub-valve chamber 3R. Moreover, the high lubricity guide member 30 has the cylindrical part 30b which penetrates the needle valve 42', and forms a clearance gap around the needle valve 42'. The outer diameter of the cylindrical portion 30b is smaller than the inner diameter of the sub-valve inner portion 32, and a communication space 3R1 as a part of the sub-valve chamber 3R is formed over the entire circumference between the cylindrical portion 30b and the sub-valve inner portion 32. Further, inside the high lubricity guide member 30, a sub-valve housing chamber 3R2, which is a part of the sub-valve chamber 3R for housing the sub-valve 4', is formed, and a main valve body is formed at a position outside the cylindrical portion 30b. The upper part of the communication passage 3c of the valve body 3 is a communication passage 30a that communicates the communication space 3R1 with the sub-valve housing chamber 3R2. The fluid flowing into the main valve chamber 1R from the first joint pipe 11 flows to the communication space 3R1 through the communication passage 3c of the main valve body 3 having a larger diameter than that of the first embodiment, and passes through the inside of the sub-valve inner package 32 . The gap between the circumference and the outer circumference of the high lubricity guide member 30 flows to the sub-port 3a side through the communication passage 30a and through the gap between the cylindrical portion 30b and the needle valve 42'. Since the communication space 3R1 is formed over the entire circumference, the communication passage 3b of the main valve body 3 can communicate with the communication passage 30a via the communication space 3R1 regardless of the rotational position of the high lubricity guide member 30 . Furthermore, in the third embodiment, the guide bosses 41 ′ easily slide in the high lubricity guide member 30 , the generation of operating noise and vibration of the electric valve 100 can be suppressed, and the auxiliary valve body 4 ′ can be obtained. good workability.

In addition, since the cylindrical portion 30b surrounds the needle valve 42' of the sub-valve 4', the needle valve 42' is hardly affected by the dynamic pressure of the fluid flowing out from the communication passage 3c of the main valve body 3, and the needle valve 42 can be prevented from ' vibration. Therefore, the flow rate of the fluid flowing through the secondary valve port 3a is stabilized. Further, after the fluid passes through the communication passage 3c (horizontal hole) of the main valve body 3, the flow passage is caused by a gap extending in the direction of the axis L between the sub-valve inner casing 32 and the high lubricity guide member 30 up to the communication passage 30a. (flow path) is bent in the direction of the axis L, so the flow velocity decreases. Accordingly, the flow velocity of the fluid flowing into the sub-valve housing chamber 3R2 inside the high lubricity guide member 30 is also reduced, so even if the fluid collides with the sub-valve 4', the sub-valve 4' can be suppressed from vibrating.

4 is a cross-sectional view of a main part of an electric valve according to a fourth embodiment of the present invention. Between the inner circumference of the sub-valve chamber 3R and the outer circumference of the guide boss portion 41 ′, a highly lubricity guide member 40 is arranged in sliding contact with the guide boss portion 41 ′. The high lubricity guide member 40 has the same external shape as the high lubricity guide member 30 of the third embodiment, and has a cylindrical portion 40b through which the needle valve 42' is inserted and a gap is formed around the needle valve 42'. The outer diameter of the cylindrical portion 40b is smaller than the inner diameter of the sub-valve inner portion 32, and a communication space 3R1 as a part of the sub-valve chamber 3R is formed over the entire circumference between the cylindrical portion 40b and the sub-valve inner portion 32. Moreover, in the inside of the high lubricity guide member 40, the sub valve body accommodation chamber 3R2 which accommodates the sub valve body 4' is formed. In addition, a communication passage 40a is formed in the cylindrical portion 40b at a position facing the communication passage 3c of the main valve body 3 . The fluid that has flowed into the main valve chamber 1R from the first joint pipe 11 passes through the communication passage 3c of the main valve body 3 to flow into the communication space 3R1, passes through the communication passage 40a from the outer periphery of the high lubricity guide member 40, and then passes through the sub valve body The gap between the cylindrical portion 40b and the needle valve 42' in the housing chamber 3R2 flows toward the sub-valve 3a side. Since the communication space 3R1 is formed over the entire circumference, regardless of the rotational position of the high lubricity guide member 40, the communication passage 3c of the main valve body 3 can communicate with the communication passage 40a via the communication space 3R1. Furthermore, in the fourth embodiment, the guide bosses 41 ′ can easily slide within the high lubricity guide member 40 , the generation of operating noise and vibration of the electric valve 100 can be suppressed, and the sub-valve 4 ′ can be obtained. good workability.

5 is a cross-sectional view of a main part of an electric valve according to a fifth embodiment of the present invention. Between the inner periphery of the sub-valve chamber 3R and the outer periphery of the guide boss 41', a highly lubricity guide member 50 and a cylindrical filter F are arranged in sliding contact with the guide boss 41'. The outer shape of the high lubricity guide member 50 is substantially the same as that of the high lubricity guide member 30 of the third embodiment, and has a cylindrical portion 50b through which the needle valve 42' is inserted and a gap is formed around the needle valve 42'. In addition, a communication passage 50a that opens on the filter F side is formed on the side of the high lubricity guide member 50 . The fluid flowing into the main valve chamber 1R from the first joint pipe 11 passes through the communication passage 3c of the main valve body 3 and flows to the communication space 3R1, and passes through the filter F from the outer periphery of the cylindrical portion 50b of the high lubricity guide member 50, Then, it flows into the inner side of the high lubricity guide member 50 through the communication passage 50a. Then, the flow passes through the gap between the cylindrical portion 50b and the needle valve 42' to the side of the secondary valve port 3a. In addition, in the fifth embodiment, the guide bosses 41 ′ are easily slid in the high lubricity guide member 50 , the generation of operating noise and vibration of the electric valve 100 can be suppressed, and the auxiliary valve body 4 ′ can be obtained. good workability.

In addition, since the cylindrical portion 50b surrounds the needle valve 42' of the sub-valve 4', the needle valve 42' is less affected by the dynamic pressure of the fluid flowing out from the communication passage 3c of the main valve body 3, and the needle valve 42 can be prevented from ' vibration. Therefore, the flow rate of the fluid flowing through the secondary valve port 3a is stabilized. Further, after the fluid passes through the communication passage 3c (horizontal hole) of the main valve body 3, the flow passage is bent in the direction of the axis L by the filter F (flow passage) extending in the direction of the axis L to the communication passage 50a, so the flow velocity is increased. reduce. In addition, the flow velocity is further reduced due to the flow path resistance received when the fluid passes through the filter F. As a result, the flow velocity of the fluid flowing into the sub-valve housing chamber 3R2 inside the high lubricity guide member 50 is reduced, so even if the fluid collides with the sub-valve 4', the sub-valve 4' can be suppressed from vibrating.

6 is a cross-sectional view of a main part of an electric valve according to a sixth embodiment of the present invention. Between the inner circumference of the sub-valve chamber 3R and the outer circumference of the guide boss portion 41 ′, a highly lubricating guide member 60 is arranged in sliding contact with the guide boss portion 41 ′. The sixth embodiment does not have the filter F of the fifth embodiment, and the communication passage 3b of the main valve body 3 has a circle through which the needle valve 42' is inserted and a gap is formed around the needle valve 42', as in the first embodiment. The cylindrical portion 60b. In addition, a communication passage 60 a that opens to the sub-valve chamber 3R is formed on the side of the high lubricity guide member 60 . The fluid flowing into the main valve chamber 1R from the first joint pipe 11 flows through the communication passage 3b of the main valve body 3 to the communication space 3R1, and passes through the gap between the outer periphery of the high lubricity guide member 60 and the sub-valve inner envelope 32 , and then flows to the inside of the high lubricity guide member 60 through the communication passage 60a. Then, the flow passes through the gap between the cylindrical portion 60b and the needle valve 42' to the side of the secondary valve port 3a. Furthermore, in the fifth embodiment, the guide bosses 41 ′ easily slide within the high lubricity guide member 60 , the generation of operating noise and vibration of the electric valve 100 can be suppressed, and the auxiliary valve body 4 ′ can be obtained. good workability.

In addition, since the cylindrical portion 60b surrounds the needle valve 42' of the sub-valve 4', the needle valve 42' is less affected by the dynamic pressure of the fluid flowing out from the communication passage 3b of the main valve body 3, and the needle valve 42 can be prevented from ' vibration. Therefore, the flow rate of the fluid flowing through the secondary valve port 3a is stabilized. Then, after the fluid passes through the communication passage 3b (horizontal hole) of the main valve body 3, the flow passage is formed by the gap (flow passage) extending in the direction of the axis L between the sub-valve inner casing 32 and the high lubricity guide member 60. The axis L direction is curved, so the flow velocity decreases. Accordingly, the flow velocity of the fluid flowing into the sub-valve housing chamber 3R2 inside the high lubricity guide member 60 is also reduced, so even if the fluid collides with the sub-valve 4', vibration of the sub-valve 4' can be suppressed.

7 is a cross-sectional view of a main part of an electric valve according to a seventh embodiment of the present invention. Between the inner circumference of the sub-valve chamber 3R and the outer circumference of the guide boss 41', a high lubricity guide member 70 and a cylindrical filter F' are arranged in sliding contact with the guide boss 41'. . The external shape of the high lubricity guide member 70 is substantially the same as that of the high lubricity guide member 30 of the third embodiment, and has a cylindrical portion 70b through which the needle valve 42' is inserted and a gap is formed around the needle valve 42'. In addition, a communication passage 70a that opens on the filter F' side is formed on the side of the high lubricity guide member 70 . The fluid flowing into the main valve chamber 1R from the first joint pipe 11 flows through the communication passage 3c of the main valve body 3 to the communication space 3R1, and passes through the filter F′ from the outer periphery of the cylindrical portion 70b of the high lubricity guide member 70 , and then flows into the inner side of the high lubricity guide member 70 through the communication passage 70a. Then, the flow passes through the gap between the cylindrical portion 70b and the needle valve 42' to the side of the secondary valve port 3a. Furthermore, in the seventh embodiment, the guide bosses 41 ′ easily slide within the high lubricity guide member 70 , the generation of operating noise and vibration of the electric valve 100 can be suppressed, and the sub-valve 4 ′ can be obtained. good workability.

In addition, since the cylindrical portion 70b surrounds the needle valve 42' of the sub-valve 4', the needle valve 42' is less affected by the dynamic pressure of the fluid flowing out from the communication passage 3b of the main valve body 3, and the needle valve 42 can be prevented from ' vibration. Therefore, the flow rate of the fluid flowing through the secondary valve port 3a is stabilized. Further, after the fluid passes through the communication passage 3c (horizontal hole) of the main valve body 3, the flow passage is bent in the direction of the axis L by the filter F' (flow passage) extending in the direction of the axis L up to the communication passage 70a. Flow rate decreased. In addition, the flow velocity is further reduced due to the flow path resistance received when the fluid passes through the filter F'. Thereby, the flow velocity of the fluid flowing into the sub-valve housing chamber 3R2 inside the high lubricity guide member 70 is reduced, so even if the fluid collides with the sub-valve 4 ′, the vibration of the sub-valve 4 ′ can be suppressed.

8 is a cross-sectional view of a main part of an electric valve according to an eighth embodiment of the present invention. The sub-valve 4 ″ of the eighth embodiment is composed of a guide boss 41 ″ thinner than the guide boss 41 ′ of the seventh embodiment and a needle longer than the needle valve 42 ′ of the seventh embodiment The valve 42" is constituted. Furthermore, a highly lubricity guide member 80 which is in sliding contact with the guide boss 41" is disposed between the inner circumference of the sub-valve chamber 3R and the outer circumference of the guide boss 41''. In the same manner as in the second embodiment, the high lubricity guide member 80 is formed with a communication passage 80a that communicates the communication space 3R1 with the sub-valve housing chamber 3R2 at the upper portion of the communication passage 3c of the main valve body 3. The flow from the first joint pipe 11 flows in. The fluid in the main valve chamber 1R flows to the communication space 3R1 through the communication passage 3c of the main valve body 3, passes through the filter F″ from the outer periphery of the cylindrical portion 80b of the high lubricity guide member 80, and then passes through the communication passage 80a. It flows to the inner side of the high lubricity guide member 80 . In addition, in the eighth embodiment, the guide bosses 41 ″ are more likely to pass through the gap between the cylindrical portion 80 b and the needle valve 42 ″ to the side of the auxiliary valve port 3 a . The inner sliding can suppress the generation of operating noise and vibration of the electric valve 100, and can obtain good workability of the auxiliary valve body 4".

In addition, since the cylindrical portion 80b surrounds the needle valve 42" of the sub-valve 4", the needle valve 42" is less affected by the dynamic pressure of the fluid flowing out from the communication passage 3b of the main valve body 3, and the needle valve 42 can be prevented from "Vibration. Therefore, the flow rate of the fluid flowing through the secondary valve port 3a is stabilized. Then, after the fluid passes through the communication passage 3c (horizontal hole) of the main valve body 3, the flow passage is bent in the direction of the axis L by the communication passage 80a (and the filter F″) extending in the direction of the axis L to the communication passage 80a , so the flow rate is reduced. Furthermore, the flow rate is further reduced due to the flow path resistance received when the fluid passes through the filter F″. Thereby, the flow velocity of the fluid flowing into the sub-valve housing chamber 3R2 inside the high lubricity guide member 80 is reduced, so even if the fluid collides with the sub-valve 4", the vibration of the sub-valve 4" can be suppressed.

9 is a cross-sectional view of a main part of an electric valve according to a ninth embodiment of the present invention. The sub valve body 4 ″ of the ninth embodiment is the same as the eighth embodiment. Furthermore, between the inner circumference of the sub valve chamber 3R and the outer circumference of the guide boss portion 41 ″, the guide boss portion is arranged between the inner circumference and the guide boss portion 41 ″. 41″ of high lubricity guide member 90 in sliding contact. Similar to the third embodiment, the high lubricity guide member 90 is formed with a communication space 3R1 and a sub-valve storage chamber 3R2 in the upper portion of the communication passage 3c of the main valve body 3 A filter F1 is provided on the side of the sub-valve housing chamber 3R2, and the communication passage 90a communicates. The fluid flowing into the main valve chamber 1R from the first joint pipe 11 flows through the communication passage 3c of the main valve body 3 and communicates with it. The space 3R1R flows from the outer periphery of the cylindrical portion 90b of the high-lubricity guide member 90 through the communication passage 90a, and then passes through the filter F1 to the inside of the high-lubricity guide member 90. The cylindrical portion 90b and the needle valve 42 pass through the space 3R1R. ", and flow to the side of the secondary valve port 3a. In addition, in the ninth embodiment, the guide bosses 41 ″ are easily slid in the high lubricity guide member 90 , the generation of operating noise and vibration of the electric valve 100 can be suppressed, and the sub spool 4 ″ can be obtained good workability.

In addition, since the cylindrical portion 90b surrounds the needle valve 42" of the sub-valve 4", the needle valve 42" is less affected by the dynamic pressure of the fluid flowing out from the communication passage 3b of the main valve body 3, and the needle valve 42 can be prevented from "Vibration. Therefore, the flow rate of the fluid flowing through the secondary valve port 3a is stabilized. Then, after passing through the communication passage 3c (horizontal hole) of the main valve body 3, the fluid passes through the communication passage 90a (and the filter F1) extending in the direction of the axis L to reach the communication passage 90a, and the flow passage is bent in the direction of the axis L, Therefore the flow rate is reduced. Thereby, the flow velocity of the fluid flowing into the sub-valve housing chamber 3R2 inside the high lubricity guide member 90 is also reduced, so even if the fluid collides with the sub-valve 4", the vibration of the sub-valve 4" can be suppressed.

In the fifth, seventh, eighth, and ninth embodiments, since the filters F, F', F", and F1 are provided in the above-described embodiments, in addition to the above-described effects, it is possible to reduce the The sound pressure of the fluid passing through the sound.

As mentioned above, the embodiment of the present invention has been described in detail with reference to the drawings, and other embodiments have also been described in detail, but the specific configuration is not limited to the above-described embodiment, and design changes and the like may be made within the scope of the gist of the present invention. Included in the present invention.

Claims (4)

1. An electric valve comprising a main valve body and a sub valve body, the main valve body is provided in a main valve chamber of a valve main body, and opens and closes a main valve port opening to the main valve chamber, and the sub valve body is located in the main valve chamber. A sub-valve chamber formed in the main valve body moves in an axial direction of a sub-valve port formed in the main valve body to control an opening degree of the sub-valve port, and the electric valve is formed to communicate from the main valve chamber to the sub-valve. In the small flow control region, the main valve port is closed by the main valve body, and the port is throttled by the gap between the needle valve of the sub valve body and the sub valve port. The part throttles the fluid flowing into the auxiliary valve chamber through the communication passage, and the electric valve is characterized in that: The sub-valve is provided with a guide boss arranged in the sub-valve chamber, and is provided with a high lubricating oil in which the guide boss is in sliding contact between the inner circumference of the sub-valve chamber and the outer circumference of the guide boss. Sexually Oriented Components. 2. The electric valve according to claim 1, characterized in that, The high lubricity guide member has a cylindrical portion separated from the inner periphery of the sub-valve chamber, and the communication passage is opened in a communication space around the cylindrical portion. 3. The electric valve according to claim 2, characterized in that, The cylindrical portion of the high lubricity guide member surrounds the needle valve of the sub valve body. 4. The electric valve according to claim 2 or 3, characterized in that, A sub-valve housing chamber for housing the sub-valve is formed inside the high lubricity guide member, and has a flow extending in the axial direction from the communication space around the cylindrical portion to the sub-valve housing chamber road.

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