JP7422189B2 - electric valve - Google Patents

Description

The present invention relates to a flow control valve including an electric valve and a solenoid valve, which controls the flow rate of fluid.

Flow control valves including electric valves and electromagnetic valves that control the flow rate of fluid have been known. Among such flow control valves, a motor-operated valve described in Patent Document 1 is known, which is used as an electrically-operated expansion valve in a heat pump type air-conditioning system or a refrigeration system. Hereinafter, such a conventional electric valve will be explained using FIGS. 1(a) to 2(b).

FIG. 1(a) is a front view showing a schematic configuration of a conventional electric valve 10, and FIG. 1(b) shows a brazing process in which the valve body 11 shown in FIG. 1(a) is arranged in the opposite direction. 2(a) is a side view showing the state of the valve body 11 shown in FIG. 1(b) after brazing, and FIG. 2(b) is a front view showing the valve body 11 shown in FIG. 2(a). FIG. 3 is a side view showing a welding process for the valve body 11. FIG.

As shown in FIG. 1(a), a conventional electric valve 10 mainly includes a valve body 11, a case 12, and two joints 13 and 14. The valve body 11 and the case 12 are both made of stainless steel and are joined by welding. Furthermore, the two joints 13 and 14 must also be joined to the valve body 11 while maintaining airtightness and pressure resistance.

Patent No. 5684746

There is no limitation on the material of the two joints 13, 14, but if the material of the joints 13, 14 is different from the material of the valve body 11, for example, copper, it will be difficult to join by welding, so brazing is not recommended. There is a need to do. When performing such brazing, it is common to perform brazing with the valve body 11 facing the opposite direction, as shown in FIG. 1(b). This is because the downward joint 14 can be easily fixed during brazing.

At this time, due to the amount of brazing filler metal used or variations in the ambient temperature during brazing, the melted brazing filler metal 13WB from the joint of the sideways joint 13 melts under its own weight, as shown in FIG. 2(a). It may fall off and cause wax sag. In such a case, as shown in FIG. 2(b), in the subsequent welding process of welding the valve body 11 and the case 12, the melted brazing filler metal 13WB may be applied to the end surface of the valve body 11, which will be the welding surface. , the valve body 11 and the case 12 may not be able to contact each other normally. In this case, an inclination or gap may occur between the valve body 11 and the case 12, resulting in poor welding, or the brazing metal may melt into the metal structure of the weld, resulting in strength problems, which may cause the electric valve Internal airtightness and pressure resistance may be impaired.

In addition, during subsequent processes such as press-fitting and caulking, solder sag causes the reference surface, which is the contact surface with the jig, to shift, causing problems in subsequent manufacturing processes such as not being able to fix it properly. There were cases.

Therefore, an object of the present invention is to suppress the conventional problems caused by poor brazing such as solder sag in the manufacturing process with a simple structure, and to provide flow control that can maintain airtightness and pressure resistance. The purpose is to provide a valve.

In order to solve the above problems, the flow control valve of the present invention has a valve chamber that houses therein a valve body that controls the flow rate of fluid, and has a valve seat that allows the valve body to approach or move away from the valve chamber. a valve body formed of a metal material; a drive unit joined to the valve body to drive the valve body; and at least a drive unit formed of a metal material different from the valve body and brazed to the valve body. a joint, on the outer periphery of the valve body, a joint between an end face of the valve body on the drive unit side and/or an end face on the valve seat side and the at least one joint; It is characterized by a groove being provided between it.

Further, the valve body may have a cylindrical shape, and the groove may be formed around the entire circumference of the cylindrical valve body.

Further, the groove may have a knurled shape.

Further, the valve body may have a cylindrical shape, and the groove may be formed in a part of the cylindrical valve body.

Further, the groove may have a circumferential width smaller than an outer diameter of the joint.

Moreover, the groove may be plural.

Further, the end surface may serve as a joint surface with another component.

Further, the joint surface may be a welding surface to another component.

Further, the end surface may serve as a reference surface in a later step.

Further, the flow control valve may be an electric valve.

Further, the flow rate control valve may be a solenoid valve.

According to the present invention, it is possible to provide a flow control valve that can suppress problems in the manufacturing process due to solder sag, which were conventional problems, with a simple structure and maintain airtightness and pressure resistance.

FIG. 1(a) is a front view showing the general configuration of a conventional electric valve, and FIG. 1(b) is a front view showing a brazing process in which the valve body shown in FIG. 1(a) is arranged in the opposite direction. It is a diagram. FIG. 2(a) is a side view showing the state of the valve body shown in FIG. 1(b) after brazing, and FIG. 2(b) shows the welding process of the valve body shown in FIG. 2(a). FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing a schematic configuration of an electric valve that is a first embodiment of a flow control valve according to the present invention. 4(a) is an enlarged front view of the valve body portion of the motor-operated valve shown in FIG. 3, and FIG. 4(b) is an enlarged front view of the IVB portion shown in FIG. 4(a). FIG. 4(c) is a partially enlarged view, and FIG. 4(c) is a side view of the valve body shown in FIG. 4(a) after being brazed. FIG. 5(a) is a front view showing an enlarged valve body portion of a motor-operated valve which is a second embodiment of the flow control valve according to the present invention, and FIG. It is a partially enlarged view showing the VB part shown in a) in an enlarged manner. FIG. 6(a) is a side view showing the welding process of the conventional electric valve, and FIG. 6(b) is a front view showing the brazing process of the valve body of the electric valve shown in FIG. 6(a). . 7(a) is a front view showing the state of the valve body shown in FIG. 6(b) after brazing, and FIG. 7(b) is a side view of the valve body shown in FIG. 7(a). . It is a front view showing an enlarged portion of the valve body of the electric valve which is the third embodiment of the flow control valve according to the present invention. FIG. 9(a) is a sectional view showing an example of a conventional solenoid valve, and FIG. 9(b) is a sectional view showing a press-fitting process or caulking process of the valve seat of the solenoid valve shown in FIG. 9(a). be. FIG. 10(a) is a sectional view showing the brazing process of the solenoid valve shown in FIG. 9(a), and FIG. 10(b) is a sectional view showing the state of the solenoid valve shown in FIG. 10(a) after brazing. FIG. It is a front view showing an enlarged portion of the valve body of the electromagnetic valve which is the fourth embodiment of the flow control valve according to the present invention. FIG. 12(a) is an enlarged side view showing the valve body of the electric valve which is the fifth embodiment of the flow control valve according to the present invention, and FIG. 12(b) is the same as that in FIG. It is a side view which shows the state after brazing of the valve main body shown in FIG. FIG. 13(a) is a front view showing an example of processing to provide a groove in the valve body, and FIG. 13(b) is a partially enlarged view showing XIIIB shown in FIG. 13(a), and FIG. 13(c) is a side view of FIG. 13(a).

Embodiments of the present invention will be described below with reference to the drawings.

First, a first embodiment of the present invention will be described.

Note that the concept of "up and down" in the following description corresponds to, for example, "up and down" in FIG. 3, and indicates the relative positional relationship of each member, and does not indicate the absolute positional relationship.

FIG. 3 is a longitudinal cross-sectional view showing a schematic configuration of an electric valve 100, which is a first embodiment of a flow control valve according to the present invention.

In FIG. 3, an electrically operated valve 100 is an electrically operated valve that is mainly used as an electrically operated expansion valve or the like in a heat pump air conditioning system or a refrigeration system. The electric valve 100 includes a valve main body 110 in which a valve chamber 111A is formed, a needle portion 120 housed inside the valve chamber 111A, a rotor shaft rotating portion 130 connected to the needle portion 120, and a rotor shaft rotating portion 130 connected to the needle portion 120. It is mainly composed of a rotor shaft driving section 140 that drives the rotating section 130, and an exterior section 150 that is connected to the valve body section 110 and houses the rotor shaft rotating section 130 and the rotor shaft driving section 140 therein.

The valve body portion 110 includes a valve body 111 and a valve seat 112.

The valve body 111 is formed, for example, by processing a metal material such as a stainless steel plate by press working or the like. The valve body 111 is formed with a valve chamber 111A that accommodates a needle 121, which will be described later. A first port 111b to which the first joint 101 is joined is formed on the side wall of the valve chamber 111A, and a second port 111c to which the second joint 102 is joined is formed on the bottom surface of the valve chamber 111A. It is formed.

Note that the first joint 101 and the second joint 102 may be made of metal such as copper or stainless steel, but in the present invention, the first and second joints 101 and 102 are made of metal such as copper or stainless steel. It is fixed to the main body 111 by brazing and is made of a different metal material from the valve main body 111. Further, in this embodiment, the description will be made assuming that the refrigerant flows through the first port 111b as the input side and the second port 111c as the output side, but the present invention is not limited to this, and the electric valve 100 of the present embodiment may be a bidirectional motor-operated valve in which the first port 111b can be used as an output side and the second port 111c can also be used as an input side.

The valve seat 112 is made of a metal material such as stainless steel or copper alloy, and is fixed by welding, brazing, etc. around the second port 111c of the valve body 111 to which the second joint 102 is connected. A valve port 112a is formed in the valve seat 112, which is a through hole passing through the center and is connected to the second joint 102 via a second port 111c. The valve port 112a is placed close to or separated from a needle 121, which will be described later, to control the flow rate of fluid. Here, the valve seat 112 is a separate member from the valve body 111, but it may be formed integrally with the valve body 111 if there is no problem with durability or operability.

The needle portion 120 includes a needle 121, a valve spring 122, a spring receiver 123, a washer 124, and a needle case 125.

The needle 121 is also called a valve body, is made of a metal material such as stainless steel, and is driven in the direction of the central axis CL by a rotor shaft 131, which will be described later, to control the flow rate of the fluid. The side of the needle 121 that is close to the valve port 112a is formed into a shape in which the center gently protrudes, and is formed so that the effective opening area can be quantitatively increased or decreased by controlling the flow rate of the fluid with the valve port 112a. ing. Further, a substantially cylindrical needle case 125, which will be described later, is fixed to the rotor shaft 131 side of the needle 121 by welding, and a valve spring 122 is held inside the needle case 125.

The valve spring 122 is arranged inside a substantially cylindrical needle case 125, and is compressed and arranged between the needle 121 and a spring engaging portion 123a of a spring receiver 123, which will be described later. Note that the provision of the valve spring 122 has the effect of preventing the screw thrust force from the rotor shaft 131 (described later) etc. from being applied directly to the needle 121, the valve port 112a, etc., and has the effect of increasing the durability of the electric valve 100.

The spring receiver 123 is formed, for example, into a substantially cylindrical shape of resin or the like, and is located between a rotor shaft 131 (described later) and the needle 121 inside a substantially cylindrical needle case 125, and has a central axis CL inside the valve spring 122. placed along the A disk-shaped spring engagement portion 123a protruding toward the outer diameter direction is formed at the end of the spring receiver 123 on the side that comes into contact with the rotor shaft 131.

Note that by providing the spring receiver 123 and arranging it inside the valve spring 122 along the central axis CL, there is an effect of increasing the concentricity of the valve spring 122 and improving the operability, but it is limited to this configuration. It's not a thing. If the spring receiver 123 is not provided, the valve spring 122 will be compressed and disposed between the needle 121 and a flange portion 131b of the rotor shaft 131, which will be described later.

The washer 124 is made of, for example, a highly lubricating resin and has an annular shape, and is disposed between a flange portion 131b of a rotor shaft 131, which will be described later, and a reduced diameter portion 125a of a needle case 125, which will be described later. Note that by providing the washer 124, it is possible to suppress the rotation of the rotor shaft 131 from being directly transmitted to the needle 121. This suppresses the rotation of the needle 121 and has the effect of preventing wear of the needle 121 and the valve port 112a of the valve seat 112.

The needle case 125 is made of a metal material such as stainless steel and is formed into a substantially cylindrical shape by press working or the like. A reduced diameter portion 125a is formed at the end of the needle case 125 on the rotor shaft 131 side, which is bent inward at right angles. The needle case 125 has the function of transmitting the screw driving force of a rotor shaft 131 and the like, which will be described later, to the needle 121. The reduced diameter portion 125a of the needle case 125 is arranged so as to face and engage with a flange portion 131b of a rotor shaft 131, which will be described later. Further, the needle 121 is fixed to the end of the needle case 125 opposite to the reduced diameter portion 125a by welding or the like.

The rotor shaft rotating section 130 includes a rotor shaft 131, a female thread member 132, and a fixing fitting 133.

The rotor shaft 131 is made of, for example, a metal material, has a rod shape with a generally circular cross section, and is arranged to extend vertically along the central axis CL of the electric valve 100. The rotor shaft 131 is fixed to the center of a magnet rotor 141 rotated by an electric motor such as a stepping motor, which will be described later, by a rotor fixing member 142, which will be described later, and rotates around the central axis CL in accordance with the rotation of the magnet rotor 141.

A male threaded portion 131a is formed in a portion of the rotor shaft 131 closer to the needle 121 than the rotor fixing member 142, and is screwed to a female threaded portion 132b of a female threaded member 132, which will be described later. At the end of the rotor shaft 131 on the needle 121 side, a flange portion 131b that protrudes in a disk shape in the outer diameter direction is formed. The flange portion 131b is arranged closer to the needle 121 than the reduced diameter portion 125a inside the needle case 125, has a larger diameter than the reduced diameter portion 125a, and is prevented from coming off.

The female thread member 132 is made of, for example, resin and has a generally cylindrical shape, and a through hole with a circular cross section along the central axis CL of the electric valve 100 has a female thread portion 132b formed at its upper portion, and a male thread portion 131a of the rotor shaft 131. are screwed together. The female screw member 132 has the function of converting the rotational movement of the magnet rotor 141 (described later) into the linear movement of the rotor shaft 131 through this threaded connection.

A guide chamber 132A is formed in the center of the female screw member 132 on the needle 121 side, in which the needle case 125 can be slidably accommodated as the needle 121 moves. Further, a pressure equalizing hole 132c is provided in a part of the guide chamber 132A. Thereby, the guide chamber 132A and the rotor chamber 141A, which will be described later, are communicated with each other, and the rotor shaft 131 and the needle case 125 can be easily moved. Furthermore, a fixing fitting 133 is fixed near the middle stage of the outer circumference of the female threaded member 132.

The fixing fitting 133 is a metal disc-shaped member, and is fixed to the female screw member 132 by, for example, insert molding. The outer peripheral portion of the fixing fitting 133 is further fixed to the circular upper end portion of the valve body 111 by welding or the like. As a result, the female threaded member 132 is non-rotatably fixed to the valve body 111 via the fixing fitting 133.

The rotor shaft drive unit 140 includes a magnet rotor 141 , a rotor fixing member 142 , a rotation stopper spring 143 , and a movable stopper member 144 .

The magnet rotor 141 is housed in a rotor chamber 141A inside a case 151, which will be described later, and is constituted by a multipolar permanent magnet made of a ferrite sintered body or the like and having north and south poles arranged alternately. In this embodiment, the magnet rotor 141 is arranged on the outer periphery of a case 151, which will be described later, and constitutes a stepping motor together with a stator including a yoke, a bobbin, a coil, etc. (not shown). Note that although a stepping motor is used here, the present invention is not limited to this, and similar effects can be obtained even if other electric motors capable of rotationally driving the magnet rotor 141 are used.

The rotor fixing member 142 is provided at the center of the magnet rotor 141, and fixes the magnet rotor 141 and the rotor shaft 131 by press fitting or the like.

The rotation stopper spring 143 has a coil spring shape and is arranged around a cylindrical portion 152b of the rotor support member 152, which will be described later. The upper end of the rotation stopper spring 143 is fixed to the upper part of the cylindrical portion 152b of the rotor support member 152, and the lower end is engaged with and fixed to the movable stopper member 144.

The movable stopper member 144 has a one-turn coil spring shape and is rotatably arranged around the cylindrical portion 152b of the rotor support member 152. One end of the movable stopper member 144 is engaged with an engagement protrusion 141b integrally formed with one predetermined pole of the magnet rotor 141 having multiple poles, and the other end is engaged with an engagement protrusion 141b formed integrally with a predetermined one pole of the magnet rotor 141 having multiple poles, and the other end is engaged with the engagement protrusion 141b formed integrally with a predetermined one pole of the magnet rotor 141 having multiple poles. engaged with the lower end. With this configuration, the rotation stopper spring 143 is arranged without wobbling with respect to the central axis CL of the electric valve 100, and the elastic force of the rotation stopper spring 143 allows the rotation of the magnet rotor to be driven. 141 is smoothly returned to a predetermined position via the movable stopper member 144.

The exterior portion 150 includes a case 151, a rotor support member 152, and a cylindrical member 153.

The case 151 is formed by processing a non-magnetic metal such as a stainless steel plate into a cup shape by press working or the like. The circular lower end of the case 151 is hermetically fixed to the circular upper end of the valve body 111 by butt welding the entire circumference by TIG welding, plasma welding, laser welding, or the like. Furthermore, a dimple 151a is formed on the case 151 to engage with an engagement recess 152c formed in an umbrella-shaped portion 152a of a rotor support member 152, which will be described later.

The rotor support member 152 is formed by press working or the like from a stainless steel plate or the like, and includes an umbrella-shaped portion 152a that is fixed in contact with the case 151, and a cylindrical portion 152b that extends downward from the center of the umbrella-shaped portion 152a. be done. An engagement recess 152c is formed in the umbrella-shaped portion 152a, and by engagement of the engagement recess 152c with the dimple 151a of the case 151, the rotor support member 152 is fixed in a predetermined mounting position of the case 151 in a non-rotatable manner. be done.

The cylindrical member 153 is made of a highly lubricating material such as metal or synthetic resin, and is disposed inside the cylindrical portion 152b of the rotor support member 152, and rotatably holds the upper end of the rotor shaft 131. There is.

The operation of the electric valve 100 of the present invention configured as described above will be explained.

When driving the electric valve 100 of the present invention, it starts by applying a drive pulse signal to the stator. As a result, the magnet rotor 141 rotates in accordance with the number of pulses, the rotor shaft 131 rotates accordingly, and the male threaded portion 131a of the rotor shaft 131 and the female threaded portion 132b of the female threaded member 132 engage with each other, thereby causing the rotor shaft to rotate. 131 moves along the central axis CL while rotating.

When the motor-operated valve 100 is brought into a closed state, it is necessary to move the rotor shaft 131 downward. After the needle 121 contacts the valve seat 112, when the rotor shaft 131 moves further downward, the valve spring 122 contracts via the spring receiver 123, and the needle 121 closes the valve due to the reaction force of the valve spring 122. Pressed by the seat 112, the motor-operated valve 100 is controlled to a reliable valve-closed state.

At this time, the needle 121 is pressed against the valve seat 112 via the spring receiver 123 and the valve spring 122, so the frictional resistance on the seating surface is greater than the frictional resistance between the rotor shaft 131 and the highly slippery spring receiver 123. Since the rotating rotor shaft 131 slides between the spring receivers 123, transmission of rotation to the needle case 125 and the needle 121 is suppressed. This suppresses wear between the needle 121 and the valve port 112a. Further, since the rotor shaft 131 is pushed in, the washer 124 descends together with the flange portion 131b of the rotor shaft 131, so that the upper surface of the washer 124 does not come into contact with the lower end surface of the reduced diameter portion 125a of the needle case 125. Rotation also stops.

Subsequently, in order to return the motor-operated valve 100 from the valve-closed state to the valve-open state, it is necessary to reversely rotate the rotor shaft 131 and move it upward. As the rotor shaft 131 rises, the valve spring 122 expands via the spring receiver 123. At this time, the needle 121 remains in contact with the valve seat 112. When the rotor shaft 131 further moves upward, the flange portion 131b of the rotor shaft 131 comes into contact with the inner surface of the reduced diameter portion 125a of the needle case 125 via the washer 124, and lifts up the needle case 125 while rotating. When the needle case 125 is lifted, the needle 121 fixed thereto also moves upward, the needle 121 and the valve port 112a of the valve seat 112 are brought out of contact, and the motor-operated valve 100 is controlled to the valve open state.

At this time, since the needle case 125 and the needle 121 are driven by the rotor shaft 131 via the highly slippery washer 124, transmission of the rotation of the rotor shaft 131 to the needle case 125 and the needle 121 is suppressed. Ru. This suppresses wear between the needle 121 and the valve port 112a.

The electric valve 100 of the present invention is provided with a structure that suppresses the above-described conventional problems in the manufacturing process due to poor brazing such as solder sag with a simple shape. The structure will be described below using FIGS. 4(a) and 4(b).

4(a) is an enlarged front view of the valve body 111 of the electric valve 100 shown in FIG. 3, and FIG. 4(b) is an enlarged front view of the IV portion shown in FIG. 4(a). FIG. 4(c) is a side view of the valve body 111 shown in FIG. 4(a) after being brazed.

4(a) and 4(c), a first joint 101 disposed laterally and a second joint 102 disposed downward are fixed to the valve body 111 of the electric valve 100 by brazing. be done. The first joint 101 is brazed to the first port 111b with a brazing material 101WB, and the second joint 102 is brazed to the second port 111c with a brazing material 102WB. Further, the valve body 111 is formed with a groove 111d extending around the entire circumference for blocking the outflow of the brazing material.

In this embodiment, the groove 111d formed all around the circumference is provided to dam the outflow of the brazing filler metal 101WB used in the first joint 101 arranged laterally. Therefore, the groove 111d is formed on the outer periphery of the valve body 111, and the end face between the first port 111b to which the first joint 101 is brazed and the upper side of the valve body 111, that is, the valve body 111 and the case 151. The welding surface is formed between the end surface of the valve body 111 on the case 151 side. Note that the groove 111d is formed by lathing the valve body 111.

In addition, when brazing the first and second joints 101 and 102 to the valve body 111, it is common to perform the brazing with the valve body 111 upside down, as shown in FIG. 1(b). It is. This is because it becomes easier to fix the downwardly facing second joint 102 during brazing. Furthermore, in this embodiment, ring solders are arranged between the first port 111b of the valve body 111 and the first joint 101, and between the second port 111c and the second joint 102, respectively. , brazed by furnace brazing, but not limited to this. Further, here, silver solder, phosphor bronze, copper solder, etc. are used as the brazing material, but the present invention is not limited thereto.

When such brazing is performed, brazing sag may occur due to the amount of brazing material used or variations in ambient temperature during brazing. When the brazing filler metal melts down in this way, the melted brazing filler metal melts onto the end face of the valve body 111 on the case 151 side, which is the welding surface between the valve body 111 and the case 151, as shown in FIG. 2(b). As a result, the valve body 111 and the case 151 may not be able to contact each other normally, and the brazing metal may be mixed into the metal structure of the welded portion, resulting in poor welding.

In the electric valve 100 of this embodiment, since the groove 111d is provided, even if the brazing material 101WB melts down from the first port 111b, it can be stopped by the groove 111d, and as described above. Such welding defects can be suppressed with a simple structure, and airtightness and pressure resistance can be maintained. In addition, in this embodiment, since the groove 111d is provided over the entire circumference of the valve body 111, it has the effect of reliably preventing solder dripping.

As described above, according to the first embodiment of the present invention, the first port 111b on the outer periphery of the valve body 111 to which the first joint 101 is brazed with the brazing material 101WB, and the first port 111b on the outer periphery of the valve body 111 By providing a groove 111d formed around the entire circumference of the valve body 111 between the end face on the upper case 151 side, even if the brazing filler metal 101WB melts down, this can be dammed. It is possible to provide a flow control valve that can prevent poor welding between the valve body 111 and the case 151, suppress defects in the manufacturing process with a simple structure, and maintain airtightness and pressure resistance.

Next, a second embodiment of the present invention will be described.

FIG. 5(a) is an enlarged front view of a valve body 211 of an electric valve 200 which is a second embodiment of a flow control valve according to the present invention, and FIG. 5(a) is a partially enlarged view showing the VB portion shown in FIG.

As shown in FIGS. 5(a) and 5(b), the valve body 211 of the electric valve 200 of the second embodiment has a knurled groove 211d formed over the entire circumference of the valve body 211. It is provided. The other configurations are the same as the electric valve 100 of the first embodiment. Similar configurations will be given the same reference numerals and descriptions will be omitted.

As shown in FIGS. 5(a) and 5(b), the groove 211d of the valve body 211 is located above the first port 211b and the valve body 211, similar to the groove 111d of the first embodiment. The brazing material 101WB provided between the brazing material 101WB and the end surface on the case 151 side and used for joining the first joint 101 is suppressed from melting. Note that since the groove 211d is formed around the entire circumference, it has the effect of reliably blocking the outflow of the brazing material. Furthermore, since it has a knurled shape, it is expected that the aesthetic appearance will be improved. Further, the groove 211d is formed by lathing the valve body 211 using a knurled cutting tool.

As described above, the second embodiment of the present invention not only provides the same effects as the first embodiment, but also has the effect of improving the aesthetic appearance.

Next, a third embodiment of the present invention will be described.

First, conventional problems will be explained using FIGS. 6(a) to 7(b).

FIG. 6(a) is a side view showing the welding process of the conventional electric valve 20, and FIG. 6(b) is a diagram showing the brazing process of the valve body 21 of the electric valve 20 shown in FIG. 6(a). 7(a) is a front view showing the state of the valve body 21 shown in FIG. 6(b) after brazing, and FIG. 7(b) is a front view of the valve body 21 shown in FIG. 7(a). FIG.

As shown in FIG. 6A, the conventional electric valve 20 mainly includes a valve body 21, a case 22, and two joints 23 and 24. The valve body 21 and the case 22 are both made of stainless steel and are joined by welding. Furthermore, if the two joints 23 and 24 are made of a different material from the valve body 21, for example copper, it will be difficult to join them by welding, so brazing will be required. When performing brazing in this way, as shown in FIG. 6(b), the valve body 21 is turned upside down and placed on a brazing stand, and brazing is performed. This is because the downward joint 24 can be easily fixed during brazing.

At this time, depending on the amount of brazing filler metal used or variations in the ambient temperature during brazing, the brazing filler metal may melt down due to its own weight. As explained in the first and second embodiments, this is because not only the brazing filler metal 23WB melts off from the sideways joint 23 as shown in FIG. 6(b), but also As shown in FIG. 7(b), there is also a possibility that the brazing filler metal 24WB melts down from the downward joint 24. In such a case, as shown in FIG. 6(a), when the electric valve 20 is placed on a welding jig, the reference surface, which is the contact surface with the jig, is There is a problem in that the motor-operated valve 20 is tilted due to the displacement, and normal welding cannot be performed.

The electric valve 300 of the third embodiment is provided with a structure that suppresses problems in the manufacturing process due to such poor brazing with a simple shape. The structure will be described below using FIG. 8.

FIG. 8 is an enlarged front view showing a valve body 311 of a motor-operated valve 300 which is a third embodiment of a flow control valve according to the present invention.

As shown in FIG. 8, the valve body 311 of the electric valve 300 of the third embodiment is provided with two grooves 311d1 and 311d2 formed over the entire circumference of the valve body 311. The rest of the configuration is the same as the electric valve 100 of the first embodiment, so a description thereof will be omitted.

In FIG. 8, a first joint 101 disposed laterally and a second joint 102 disposed downward are fixed to a valve body 311 by brazing. The first joint 101 is brazed to the first port 311b with a brazing material 101WB, and the second joint 102 is brazed to the second port 311c with a brazing material 102WB. The groove 311d1 is provided between the first port 311b and the end surface 311e on the case 151 side, which is the upper side of the valve body 311 and serves as a welding surface. The groove 311d1 suppresses the formation of an inclination or a gap in the welding surface due to solder sag. Further, the groove 311d2 is provided between the second port 311c and an end surface 311f on the valve seat 112 side, which is the lower side of the valve body 311, and serves as a reference surface with a welding jig during welding. The groove 311d2 prevents the electric valve 300 from tilting during welding due to solder sag.

As described above, according to the third embodiment of the present invention, the first port 311b of the valve body 311, the end surface 311e on the case 151 side which is the upper side of the valve body 311, and the valve seat which is the lower side. By providing two grooves 311d1 and 311d2 between the side end surface 311f, either the brazing filler metal 101WB disposed in the first port 311b or the brazing filler metal 102WB disposed in the second port 311c melts. Even if it falls, we have created a flow control valve that can dam the outflow, prevent welding defects, suppress defects in the manufacturing process with a simple structure, and maintain airtightness and pressure resistance. can be provided.

Next, a fourth embodiment of the present invention will be described.

First, conventional problems will be explained using FIGS. 9(a) to 10(b).

FIG. 9(a) is a sectional view showing an example of a conventional electromagnetic valve 30, and FIG. 9(b) shows a press-fitting process or a caulking process of the valve seat 35 of the electromagnetic valve 30 shown in FIG. 9(a). 10(a) is a sectional view showing a brazing process of the solenoid valve 30 shown in FIG. 9(a), and FIG. 10(b) is a sectional view of the solenoid valve 30 shown in FIG. 10(a). FIG. 3 is a side view showing the state after brazing.

As shown in FIG. 9(a), a conventional solenoid valve 30 includes a valve body 31 having a valve chamber that accommodates a valve body, a plunger unit 32 that has a plunger that drives the valve body, and a plunger unit 32 that has a plunger that drives the valve body. It mainly includes a cylindrical plunger tube 36 that slides and guides, and two joints 33 and 34 that are joined toward the left and right sides of the valve body 31. Further, inside the valve chamber of the valve body 31, a valve seat 35 that can be brought close to or separated from the valve body is fixed by press-fitting and caulking.

The material of the valve body 31 is a copper alloy, and when the two joints 33 and 34 are made of copper, they are fixed to the valve body 31 by brazing. In this way, when performing brazing, it is common to perform brazing by placing the valve body 31 on a brazing stand instead of placing it in the opposite direction, as shown in FIG. 10(a). . This is because there is an opening in the upper part of the valve body 31, and the plunger tube 36 is simultaneously brazed to this opening.

At this time, depending on the amount of brazing filler metal used and variations in ambient temperature during brazing, the brazing filler metal may melt down due to its own weight. In such a case, as shown in FIG. 10(b), the brazing material 33WB sticks to the lower surface of the valve body 31. In this case, in the subsequent process of press-fitting the valve seat 35 and caulking process, etc., when the solenoid valve 30 is placed on the press-fitting or caulking jig, as shown in FIG. Due to the brazing material 33WB attached to the lower surface of the holder, the reference plane that is the contact surface with the jig is shifted, causing the electromagnetic valve 30 to tilt, causing problems in subsequent manufacturing steps. That is, as shown in FIG. 9(b), the press-fitting of the valve seat member and the caulking load are applied from the direction of the arrow, which is the original axis. However, if the brazing material 33WB gets on the bottom surface of the valve body 31 due to solder sag, it cannot make complete contact with the jig, as shown in FIG. There was a problem with.

The electromagnetic valve 400 of the fourth embodiment is provided with a structure that suppresses problems in the manufacturing process due to such poor brazing with a simple shape. The structure will be explained below using FIG. 11.

FIG. 11 is an enlarged front view showing a valve body 411 of a solenoid valve 400 which is a fourth embodiment of a flow control valve according to the present invention.

As shown in FIG. 11, a valve body 411 of a solenoid valve 400 according to the fourth embodiment of the present invention has a first joint 401 facing right and a second joint 402 facing left. It is fixed by attaching it. The first joint 401 is brazed to the first port 411b with a brazing material 401WB, and the second joint 402 is brazed to the second port 411c with a brazing material 402WB. Furthermore, a groove 411d is formed around the entire circumference of the valve body 411 between the first port 411b of the valve body 411 and the end face on the valve seat 35 side, which is the lower end face of the valve body 411. It is provided. The other configurations are the same as the conventional electromagnetic valve 30, so detailed explanation will be omitted.

The groove 411d connects the first port 411b to an end surface 411g (or , 411h), the outflow of the brazing material due to solder sag can be dammed by the groove 411d, and the solenoid valve 400 can be prevented from tilting on the jig in the subsequent process. .

As described above, according to the fourth embodiment of the present invention, not only the electric valve described in the first to third embodiments but also the electromagnetic valve of this embodiment are provided by brazing the valve body. This invention has the remarkable effect of being applicable to all flow control valves that are joined with joints.

Next, a fifth embodiment of the present invention will be described.

FIG. 12(a) is an enlarged side view showing a valve body 511 of an electric valve 500 which is a fifth embodiment of the flow control valve according to the present invention, and FIG. ) is a side view showing the state of the valve body 511 after brazing.

As shown in FIGS. 12(a) and 12(b), a part of the outer peripheral surface of the valve body 511 of the electric valve 500 of the fifth embodiment corresponds to the first joint 101. A formed groove 511d is provided. The other configurations are the same as the electric valve 100 of the first embodiment. Similar configurations will be given the same reference numerals and descriptions will be omitted.

As shown in FIGS. 12(a) and 12(b), a first joint 101 is horizontally brazed to the valve body 511 of the electric valve 500 using a brazing material 101WB, and a second joint 102 is brazed to the valve body 511 using a brazing material 101WB. It is brazed downward by 102WB. In this way, even if the groove 511d is formed in a part of the outer periphery of the valve body 511, it can be expected to have the same effect as the groove extending over the entire circumference shown in the first to fourth embodiments.

In addition, in this embodiment, as shown in FIG. 12(b), the groove 511d is provided to dam the outflow of the brazing material 101WB used in the first joint 101 arranged laterally. is the outer periphery of the valve body 511, and is the end surface between the first port 511b to which the first joint 101 is brazed and the upper side of the valve body 511, that is, the welding surface between the valve body 511 and the case 151. , is formed between the end surface of the valve body 511 on the case 151 side.

FIG. 13(a) is a front view showing an example of processing for forming a groove 511d in the valve body 511, and FIG. 13(b) is a partially enlarged view showing the processing shown in FIG. 13(a). , FIG. 13(c) is a side view of FIG. 13(a).

As shown in FIGS. 13(a) and 13(b), the groove 511d is formed by abutting a wedge-shaped grooving jig against the valve body 111, for example. In addition, the depth of the groove 511d is more preferably half or less of the wall thickness of the valve body 511 in order to prevent deformation of the end face of the valve body 511 due to the load during the above-mentioned processing.

Furthermore, as shown in FIG. 13(c), the width of the groove 511d in the circumferential direction may be smaller than the outer diameter of the joint 101 as long as solder sag can be prevented.

As described above, the fifth embodiment of the present invention has the same effects as the first to fifth embodiments, and also has the effect that grooving can be performed by limiting the processing location. .

Note that the present invention is not limited to the electric valves of the first to fourth embodiments and the electromagnetic valve of the fifth embodiment described above, but also includes a structure in which a joint is brazed to the valve body. Applicable to all flow control valves including

Further, the groove for damming the solder sag according to the present invention is not limited to one location, but may be provided in multiple locations, and the grooves are provided at the ports to be brazed and the upper side of the valve body. The valve body may be provided between the valve body and the end face on the drive unit side, or between the valve body and the valve seat side where the valve body, which is the lower side of the valve body, can approach or separate. Further, this end surface may serve as a joint surface for welding or the like, or may serve as a reference surface such as a contact surface with a jig in a subsequent process.

As explained above, according to the present invention, it is possible to suppress defects in the manufacturing process due to defective brazing such as solder sag, which have been a problem in the past, with a simple structure, and to maintain airtightness and pressure resistance. A flow control valve including a solenoid valve and a solenoid valve can be provided.

CL Central shaft 100, 200, 300, 500 Electric valve 101, 102, 401, 402 Joint 101WB, 102WB, 401WB, 402WB Brazing metal 110 Valve body 111, 211, 311, 411, 511 Valve body 111A Valve chamber 111b, 211b , 311b, 411b, 511b First port 111c, 211c, 311c, 411c, 511c Second port 111d, 211d, 311d, 411d1, 411d2, 511d Groove 112 Valve seat 112a Valve port 120 Needle part 121 Needle 122 Valve spring 12 3 Spring receiving 123a Passing section 124 Washer 125 Needle Case 125A Reduced Diameter 130 Rotor Axis Rotated Portion 131 Rotor Axis 131A Male Screw Screw Part 131B Flange Club 132 Female Screw Parts 132A Guide Room 132B Female Screw Club 132C Hair Pressure Call 133 Lotor shaft drive 140 Lotor shaft drive. Part 141 Magnet rotor 141A Rotor chamber 141b Engagement protrusion 142 Rotor fixing member 143 Rotation stopper spring 144 Movable stopper member 150 Exterior part 151 Case 151a Dimple 152 Rotor support member 152a Umbrella-shaped part 152b Cylindrical part 152c Engagement recess 153 Cylindrical member 400 Solenoid valve

Claims (6)

A cylindrical valve body formed of a metal material, in which a valve chamber is formed that accommodates a valve body that controls the flow rate of fluid, and has a valve seat that allows the valve body to approach or move away from the valve chamber;
a driving section joined to the valve body, driving the valve body, and including a magnetic rotor;
a case that accommodates the drive unit and is formed in a cup shape;
a rotor shaft connected to the valve body and rotating as the magnet rotor rotates;
a joint brazed to a side wall of the valve chamber formed in the valve body;
Equipped with
between the outer periphery of the valve body and the end face on the drive unit side that is the welding surface with other parts of the valve body and a joint part of the joint that is brazed to the side wall of the valve chamber; A groove is provided to dam the brazing material when the brazing material flows out from the joint of the joint ,
The groove is
The outer periphery of the valve body,
an end surface on the drive unit side that becomes a welding surface with other parts of the valve body;
An electric valve, characterized in that it is provided between a brazing material formed over the outer periphery of the valve body and the periphery of the joint . The electric valve according to claim 1, wherein the groove is formed around the entire circumference of the cylindrical valve body. The electric valve according to claim 2, wherein the groove has a knurled shape. The electric valve according to claim 1, wherein the groove is formed in a part of the cylindrical valve body. 5. The electric valve according to claim 4, wherein the groove has a circumferential width smaller than an outer diameter of the joint. The electric valve according to claim 1, wherein the groove is plural .

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