JP7229578B2 - on-off valve - Google Patents

Description

The present invention relates to an on-off valve and an assembly method thereof.

Patent document 1 discloses an electromagnetic valve as an example of a conventional on-off valve. The solenoid valve of Patent Document 1 has a tubular valve body with a closed upper end. An electromagnetic coil is arranged on the outer periphery of the valve body. An attractor, a plunger, a rod-shaped valve body connected to the plunger, and a valve-opening spring arranged between the attractor and the plunger are provided inside the valve body. Also, the solenoid valve has a seat member provided with a valve seat. The seat member is welded to the lower end of the valve body.

JP-A-2003-97757

In the assembly of the solenoid valve described above, the first conduit (inlet side copper pipe) is fixed to the valve body by brazing, and the second conduit (outlet side copper pipe) is fixed to the seat member by brazing. Then, after placing the attractor, plunger, valve body and valve opening spring inside the valve body, the seat member is fixed to the valve body by welding. Therefore, when the seat member is fixed to the valve body while being displaced from its position during welding, the valve seat may also be displaced, resulting in valve leakage. Also, the valve seat cannot be adjusted after the seat member is welded to the valve body. Therefore, the present inventors created a configuration in which the portion of the valve body where the valve body and the like are arranged is divided as a cap. In this configuration, after the seat member is fixed to one end of the tubular valve body, the cap in which the valve body and the like are arranged is fixed to the other end of the valve body. However, when the cap is fixed to the valve body, the cap may be tilted with respect to the valve body, and the valve body may tilt and come into contact with the valve seat. Further, in the electromagnetic valve described above, the valve main body and the seat member are separately brazed to the copper pipe, so two brazing steps are required.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an on-off valve that can effectively suppress valve leakage and a method for assembling the same.

To achieve the above object, a method for assembling an on-off valve according to one aspect of the present invention comprises: a tubular valve body; a seat member fixed to one end of the valve body; and the other end of the valve body. A method for assembling an on-off valve having a cap arranged on the end side of the seat member and a valve body arranged so as to move back and forth with respect to the valve seat of the seat member, wherein the cap protrudes from one end of the cap and a guide portion is provided at the other end of the valve body for restricting inclination of the cap with respect to the valve body by contact with an outer peripheral surface of the connecting portion, and It is characterized in that the connecting portion is inserted while being slid into the guide portion.

According to the present invention, the connecting portion is arranged so as to protrude from one end of the cap, and the outer peripheral surface of the connecting portion contacts the other end of the valve body, thereby restricting the inclination of the cap with respect to the valve body. A guide portion is provided for Then, the connecting portion is inserted while being slid into the guide portion. Since it did in this way, it can suppress that a cap will incline with respect to a valve main body. This allows the valve body to be properly seated on the valve seat when the cap supports the valve body so as to be able to move forward and backward with respect to the valve seat. Therefore, valve leakage can be effectively suppressed.

In the present invention, after the seat member is fixed to the valve body, an adjusting jig is inserted into the valve body from the guide portion to adjust the valve seat, and the connecting portion is inserted into the guide portion. , the valve body and the cap or the connecting portion are fixed by welding. By doing so, after the seat member is fixed to one end of the valve body, the valve seat is adjusted by inserting the adjusting jig from the guide portion of the valve body, so that the valve body can be properly adjusted to the valve seat. can be seated. Therefore, valve leakage can be suppressed more effectively.

In the present invention, the guide portion is provided so as to position the adjustment jig with respect to the valve body and to guide insertion of the adjustment jig into the valve body. After fixing the seat member, the adjusting jig is inserted into the guide portion to position the adjusting jig with respect to the valve body, and the guide portion guides the insertion of the adjusting jig, Preferably, the valve seat is adjusted by pressing an adjusting jig. By doing so, the adjustment jig can be properly inserted into the valve body, and the valve body can be more properly seated on the valve seat. Therefore, valve leakage can be suppressed more effectively.

In the present invention, the seat member may be fixed to the valve body by brazing, and at the same time, the first conduit may be fixed to the valve body by brazing and the second conduit may be fixed to the seat member by brazing. preferable. By doing so, the valve main body, the seat member, the first conduit and the second conduit can be fixed by one brazing process. Therefore, the number of brazing steps can be reduced. Further, even if the valve seat is displaced or deformed due to the high temperature during brazing, the valve seat is adjusted after that, so that the valve body can be properly seated on the valve seat.

To achieve the above object, an on-off valve according to another aspect of the present invention includes a tubular valve body, a seat member fixed to one end of the valve body, and a seat member fixed to one end of the valve body. An on-off valve having a cap arranged on an end side and a valve body arranged to move back and forth with respect to a valve seat of the seat member, arranged to protrude from one end of the cap. The suction element is inserted inside the other end of the valve body, and the outer peripheral surface of the suction element comes into contact with the valve body, thereby tilting the cap with respect to the valve body. is provided, and the valve body is fixed to the cap by welding.

According to the present invention, the other end of the valve body is inserted into the suction element, which is a connecting portion arranged on the cap, and the outer peripheral surface of the suction element is brought into contact with the other end of the valve body to reduce the tilt of the cap with respect to the valve body. A regulating guide is provided. Since it did in this way, it can suppress that a cap will incline with respect to a valve main body. Therefore, in the case of a configuration in which the valve body is movably supported by the cap, the valve body can be properly seated on the valve seat, and valve leakage can be effectively suppressed.

In the present invention, the outer diameter of the suction element is the same as the inner diameter of the guide section, and the outer peripheral surface of the suction element is in contact with the inner peripheral surface of the guide section over the entire circumference. By doing so, the suction element and the guide portion are coaxially arranged, and it is possible to more effectively suppress the tilting of the cap with respect to the valve body.

According to the present invention, valve leakage can be effectively suppressed.

1 is a vertical cross-sectional view of an on-off valve according to a first embodiment of the present invention; FIG. It is a figure explaining the assembly method of the on-off valve of FIG. 1 (brazing process). It is a figure explaining the assembly method of the on-off valve of FIG. 1 (valve seat adjustment process). It is a figure explaining the assembly method of the on-off valve of FIG. 1 (connection process). It is a figure explaining the assembly method of the on-off valve of FIG. 1 (welding process). FIG. 6 is a vertical cross-sectional view of an on-off valve according to a second embodiment of the present invention; FIG. 10 is a vertical cross-sectional view of an on-off valve according to a third embodiment of the present invention; FIG. 11 is a vertical cross-sectional view of an on-off valve according to a fourth embodiment of the present invention;

(First embodiment)
An on-off valve according to a first embodiment of the present invention will be described below with reference to FIGS. 1 to 5. FIG. In this specification, the on-off valve includes a valve device through which a small amount of refrigerant flows when the valve is closed.

FIG. 1 is a longitudinal sectional view of an on-off valve according to a first embodiment of the invention.

The on-off valve 1 of the first embodiment is used, for example, as a dehumidifying valve (dry valve) for throttling refrigerant during dehumidifying operation of an air conditioner. The on-off valve 1 is an electromagnetic valve that drives a valve body by magnetic force. The on-off valve 1 may be, in addition to this, an electrically operated valve or the like that drives the valve body by the rotational force of a motor.

As shown in FIG. 1, the on-off valve 1 includes a valve body 10, a seat member 20, a cap 30, an attractor 40 as a connecting portion, a plunger 50, a valve body 60, and an electromagnetic coil 70. have.

The valve body 10 integrally includes a body portion 11, a seat member attachment portion 12, and a guide portion 13. As shown in FIG. The body portion 11 is formed in a cylindrical shape. The sheet member mounting portion 12 is formed in a cylindrical shape having a diameter larger than that of the main body portion 11 and is connected to the lower end portion of the main body portion 11 . The guide portion 13 is formed in a cylindrical shape with a diameter smaller than that of the body portion 11 and is connected to the upper end portion of the body portion 11 . Both ends of the valve body 10 are open. A valve chamber 14 is provided inside the valve body 10 .

The seat member 20 integrally has a seat body 21 and a flange 22 . The seat body 21 is formed in a cylindrical shape. The flange 22 has an annular shape and is connected to the lower end of the seat body 21 . A valve port 23 that opens to the valve chamber 14 is provided inside the seat body 21 . A valve seat 24 surrounding the valve port 23 is provided on the inner edge of the upper end portion of the seat body 21 . The valve seat 24 is an annular tapered surface whose diameter gradually decreases from top to bottom. A plurality of bleed grooves 25 are provided in the valve seat 24 . The seat member 20 is fitted in the seat member mounting portion 12 (one end of the valve body 10) of the valve body 10, and the flange 22 is fixed to the seat member mounting portion 12 by brazing.

A laterally extending first conduit 16 is fixed to the body portion 11 of the valve body 10 by brazing. A downwardly extending second conduit 17 is fixed to the lower portion of the sheet member 20 by brazing. A first conduit 16 is connected to the valve chamber 14 . A second conduit 17 is connected to the valve port 23 .

The cap 30 is formed in a cylindrical shape with a closed upper end. The cap 30 has a cylindrical portion 31 and a disk-shaped ceiling portion 32 connected to the upper end portion of the cylindrical portion 31 . The cap 30 has the same inner diameter and the same outer diameter as the guide portion 13 of the valve body 10 . The cap 30 is arranged coaxially with the valve body 10 on the side of the guide portion 13 (the other end of the valve body 10 ) of the valve body 10 . A lower end portion 31a of the cylindrical portion 31 is fixed to the guide portion 13 of the valve body 10 by welding.

Attractor 40 is a fixed core magnetized by electromagnetic coil 70 . The suction element 40 is formed in a cylindrical shape. The suction element 40 is fixed to the cylindrical portion 31 of the cap 30 . The suction element 40 is arranged so that its lower end portion 40 a protrudes downward from the cylindrical portion 31 . A lower end portion 40 a of the suction element 40 is inserted into the guide portion 13 . By inserting the lower end portion 40 a of the suction element 40 into the guide portion 13 , the suction element 40 functions as a connecting portion that connects the cap 30 and the valve body 10 .

The outer diameter of the suction element 40 is the same as the inner diameter of the guide portion 13 of the valve body 10 and the inner diameter of the cylindrical portion 31 of the cap 30 . Therefore, the outer peripheral surface of the suction element 40 is in contact with the inner peripheral surface of the guide portion 13 and the inner peripheral surface of the cylindrical portion 31 over the entire circumference, and the valve body 10, the cap 30, and the suction element 40 are coaxially arranged. . Thereby, the suction element 40 restricts the tilting of the cap 30 with respect to the valve body 10 . The outer peripheral surface of the suction element 40 may be in contact with the inner peripheral surface of the guide portion 13 and the inner peripheral surface of the cylindrical portion 31 over substantially the entire circumference. This is because, if the outer peripheral surface of the suction element 40 is in contact with these inner peripheral surfaces over substantially the entire circumference, the suction element 40 can restrict the tilting of the cap 30 .

The plunger 50 has a cylindrical shape and is arranged above the suction element 40 inside the cap 30 . The plunger 50 is housed in the cap 30 so as to be vertically movable. The plunger 50 and the attractor 40 sandwich a plunger spring 51 that is a compression coil spring. The plunger 50 is attracted to the attractor 40 and moves downward when the attractor 40 is magnetized. The plunger 50 is pushed by the plunger spring 51 and moves upward when the magnetization of the attractor 40 is released. The ceiling portion 32 of the cap 30 serves as a stopper that determines the upper movement limit (upper end position) of the plunger 50 .

The valve body 60 has a rod-shaped body part 61 and a valve body part 62 connected to the lower end of the body part 61 . The body portion 61 is inserted through the suction element 40 . An upper end portion of the body portion 61 is fixed to the plunger 50 . The valve body 60 moves vertically together with the plunger 50 . The valve body portion 62 is arranged in the valve chamber 14 so as to vertically face the valve seat 24 . That is, the valve body 60 is arranged so as to be able to advance and retreat with respect to the valve seat 24 . The valve body portion 62 closes the valve port 23 (valve closed state) by coming into contact with (seated on) the valve seat 24 . The valve body portion 62 opens the valve port 23 by moving away from the valve seat 24 (valve open state).

The valve body 10, the seat member 20, the cap 30 and the valve body 60 are made of metal such as stainless steel. The first conduit 16 and the second conduit 17 are made of metal such as copper, for example. Further, the valve body 10, the seat member 20, the cap 30, the suction element 40, the plunger 50 and the valve body 60 are arranged such that their respective axes coincide with the axis line L (that is, coaxially).

The electromagnetic coil 70 is formed in a substantially cylindrical shape. The cap 30 is fitted inside the electromagnetic coil 70 . A plate spring-like stopper 71 having a hemispherical convex portion is provided on the upper portion of the electromagnetic coil 70 . The electromagnetic coil 70 is fixed to the cap 30 by fitting the hemispherical protrusion of the stopper 71 into the hemispherical recess provided in the cap 30 .

By energizing the electromagnetic coil 70, the attractor 40 and the plunger 50 are magnetized. By deenergizing the electromagnetic coil 70, the magnetization of the attractor 40 and the plunger 50 is released. The electromagnetic coil 70 cooperates with the attractor 40, the plunger 50 and the plunger spring 51 to function as a driving part.

Next, an example of a method for assembling the on-off valve 1 described above will be described with reference to FIGS. 2 to 5. FIG. 2 to 5 are cross-sectional views for explaining a method of assembling the on-off valve of FIG. 1, showing a brazing process, a valve seat adjustment process, a connecting process, and a welding process in order.

As shown in FIG. 2 , the first conduit 16 and the seat member 20 are temporarily fastened to the valve body 10 , and the second conduit 17 is temporarily fastened to the seat member 20 . Then, after the brazing material 80 is arranged at each brazing location, it is put into the furnace. After the brazing material is melted in the furnace, the members are fixed when the melted brazing material solidifies.

Distortion occurs in the valve body 10 and the seat member 20 due to the influence of high heat when the valve is placed in the furnace, and the valve seat 24 may be displaced or deformed. In this embodiment, as shown in FIG. 3, an adjusting jig 90 is inserted from the guide portion 13 of the valve body 10 to adjust the position and shape of the valve seat 24 . The adjustment jig 90 is formed in a cylindrical shape having an outer diameter equal to the inner diameter of the guide portion 13, and has an annular tapered surface 91 at its tip. Accordingly, when the adjusting jig 90 is inserted into the guide portion 13 , the outer peripheral surface of the adjusting jig 90 is in contact with the inner peripheral surface of the guide portion 13 over the entire circumference, and the adjusting jig 90 may be tilted with respect to the valve body 10 . It is regulated and positioned so that the adjustment jig 90 is arranged coaxially with respect to the valve body 10 . Further, the guide portion 13 guides the adjusting jig 90 to move along the axis L direction. By pressing the tapered surface 91 against the valve seat 24, the position of the valve seat 24 is adjusted so that the valve seat 24 is coaxial with the guide portion 13 on the axis L, and the valve seat 24 has an appropriate shape. adjusted.

Next, as shown in FIG. 4 , cap 30 accommodates suction element 40 , plunger 50 , plunger spring 51 and valve body 60 . At this time, the lower end portion 40a of the suction element 40 is arranged to protrude downward from the lower end portion 31a of the cap 30 . The cylindrical portion 31 of the cap 30 is punched to secure the suction element 40 to the cylindrical portion 31 . Then, while sliding the outer peripheral surface of the lower end portion 40a of the suction element 40 on the inner peripheral surface of the guide portion 13, the lower end portion 40a is inserted into the guide portion 13, and the cylindrical portion 31 of the cap 30 and the guide portion 13 are engaged. abut.

Then, as shown in FIG. 5, the lower end portion 31a of the cylindrical portion 31 of the cap 30 and the guide portion 13 are welded and fixed using a welding tool 95. Then, as shown in FIG. The cap 30 is inserted inside the electromagnetic coil 70 and the electromagnetic coil 70 is fixed by the stopper 71 . Thus, the on-off valve 1 is completed.

As described above, according to the method for assembling the on-off valve 1 of the present embodiment, the adjustment jig 90 is inserted into the guide portion 13 of the valve body 10 to adjust the valve seat 24 of the seat member 20 fixed to the valve body 10. do. After that, the suction element 40 fixed to the cap 30 is inserted into the guide portion 13 of the valve body 10, and the valve body 10 and the cap 30 are fixed by welding. With this arrangement, after the seat member 20 is fixed to the seat member mounting portion 12 of the valve body 10, the valve seat is adjusted by inserting the adjusting jig 90 from the opening of the guide portion 13 of the valve body 10. , the valve body 60 can be properly seated on the valve seat 24 . Therefore, valve leakage can be effectively suppressed.

Further, the valve body 10 is provided with a guide portion 13 that regulates the inclination of the cap 30 with respect to the valve body 10 by contacting the outer peripheral surface of the suction element 40 fixed to the cap 30 . Then, the suction element 40 is inserted into the guide portion 13 while being slid. By doing so, it is possible to prevent the cap 30 from tilting with respect to the valve body 10 . As a result, the valve body 60 can be properly seated on the valve seat 24 when the cap 30 supports the valve body 60 so as to be able to move forward and backward relative to the valve seat 24 . Therefore, valve leakage can be suppressed more effectively.

Also, the seat member 20 is fixed to the valve body 10 by brazing. At the same time, it is preferable to braze the first conduit 16 to the valve body 10 and to braze the second conduit 17 to the seat member 20 . By doing so, the valve body 10, the seat member 20, the first conduit 16 and the second conduit 17 can be fixed by one brazing process. Therefore, the number of brazing steps can be reduced. Further, even if the valve seat 24 is displaced or deformed due to the high temperature during brazing, the valve body 60 can be properly seated on the valve seat 24 because the valve seat 24 is adjusted after that.

(Second embodiment to fourth embodiment)
Hereinafter, on-off valves according to second to fourth embodiments of the present invention will be described with reference to FIGS. 6 to 8. FIG. In each embodiment described below, the same reference numerals are assigned to the same configurations as in the first embodiment described above, and detailed description thereof will be omitted.

6 to 8 are longitudinal sectional views of on-off valves according to second to fourth embodiments of the present invention, respectively. 6 to 8, illustration of the electromagnetic coil 70 is omitted.

The on-off valve 2 of the second embodiment shown in FIG. 6 has a valve body 10A and a seat member 20A that differ in configuration from the valve body 10 and the seat member 20 of the on-off valve 1 of the first embodiment.

The valve main body 10A has only the main body portion 11 and the guide portion 13, and the seat member mounting portion 12 is omitted. The seat member 20</b>A integrally includes a seat body 21 and a large-diameter portion 26 formed in a cylindrical shape having a larger diameter than the seat body 21 and connected to the lower end portion of the seat body 21 . The outer diameter of the large diameter portion 26 is the same as the inner diameter of the body portion 11 . When the seat member 20A is inserted from the lower end portion of the body portion 11 of the valve body 10A, the outer peripheral surface of the large diameter portion 26 contacts the inner peripheral surface of the body portion 11, and the valve body 10A and the seat member 20A are brought into contact with each other. arranged coaxially. Therefore, the valve body 60 can be properly seated on the valve seat 24 by suppressing the displacement of the valve seat 24 .

The on-off valve 3 of the third embodiment shown in FIG. 7 has a suction element 40A having a structure different from that of the on-off valve 1 of the first embodiment.

The outer diameter of the lower end portion 40 a of the suction element 40 A is the same as the inner diameter of the guide portion 13 . The outer diameter of the upper end portion 40 b of the suction element 40 A is the same as the inner diameter of the cylindrical portion 31 of the cap 30 . The outer diameter of the central portion 40c of the suction element 40A is the same as the outer diameters of the guide portion 13 and the cap 30. As shown in FIG. A lower end portion 40a of the suction element 40A is inserted into the guide portion 13, and an upper end portion 40b thereof is inserted into the cap 30. As shown in FIG. The cap 30 and the guide portion 13 are fixed by welding to the suction element 40A as a connecting portion. By inserting the upper end portion 40 b of the suction element 40</b>A into the cap 30 , the upper end portion 40 b functions as a guide portion for the cap 30 . As a result, tilting of the cap 30 with respect to the valve body 10 can be further suppressed.

The on-off valve 4 of the fourth embodiment shown in FIG. 8 has a guide portion 13A longer in the direction of the axis L than the guide portion 13 of the on-off valve 1 of the first embodiment, and a cap 30A shorter in the direction of the axis L than the cap 30. have.

A suction element 40, a plunger 50, a plunger spring 51 and a valve body 60 are accommodated in the guide portion 13A. The suction element 40 is fixed to the guide portion 13A by punching the guide portion 13A. The cap 30A has a cylindrical connecting portion 33 extending downward from the lower end of the cylindrical portion 31. As shown in FIG. The connecting portion 33 is inserted into the guide portion 13A. The cap 30A is fixed to the guide portion 13A by welding. Thereby, it is possible to further suppress the cap 30A from tilting with respect to the valve body 10 .

The on-off valves 2 to 4 of the second to fourth embodiments have the same effects as the on-off valve 1 of the first embodiment described above.

Although embodiments of the present invention have been described above, the present invention is not limited to these examples. A person skilled in the art may add, delete, or change the design of the above-described embodiments as appropriate, or combine the features of the embodiments as appropriate, as long as they do not conflict with the spirit of the present invention. included in the range of

Reference Signs List 1, 2, 3, 4... On-off valve 10, 10A... Valve main body 11... Main body portion 12... Seat member mounting portion 13, 13A... Guide portion 14... Valve chamber 16... First conduit 17... Second conduit 20, 20A Seat member 21 Seat body 22 Flange 23 Valve port 24 Valve seat 25 Bleed groove 30, 30A Cap 31 Cylindrical portion 31a Lower end , 32... Ceiling part 33... Connection part 40, 40A... Suction element 40a... Lower end part 50... Plunger 51... Plunger spring 60... Valve body 61... Body part 62... Valve body part 70... Electromagnetic coil 71 Stopper 80 Brazing material 90 Adjustment jig 91 Tapered surface 95 Welding tool

Claims (1)

A cylindrical valve body, a seat member fixed to one end of the valve body, a cylindrical cap disposed on the other end side of the valve body, and a valve seat of the seat member An on-off valve having a valve body arranged so as to be able to advance and retreat , and a cylindrical suction element ,
one end of the aspirator is arranged to protrude from one end of the cap ;
a portion of the aspirator other than the one end is disposed inside the cap and fixed to the cap;
The one end of the suction element is inserted inside the other end of the valve body, and the outer peripheral surface of the one end of the suction element is in contact with the cylinder to restrict the inclination of the cap with respect to the valve body. A shaped guide is provided,
The valve body is fixed to the cap by welding,
The one end of the suction element has a constant outer diameter that is the same as the inner diameter of the guide part,
An on-off valve, wherein the outer peripheral surface of the one end portion of the suction element is in contact with the inner peripheral surface of the guide portion over the entire circumference.

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