JP6021671B2 - Brazed joint and solenoid valve device - Google Patents

Description

  The present invention relates to a brazed joint that can be suitably used for, for example, a connecting portion of a refrigerant pipe to a valve block that controls a refrigerant flow path of an air conditioner, an electromagnetic valve device using the brazed joint, and a brazing method. It is.

  In the case of using brazing to join the flow path, such as piping that flows fluid on the inner surface, such as a refrigerant circuit of a packaged air conditioner, or a flow path in which a valve element slides on the inner surface of a flow path switching valve, etc. When brazing filler metal flows into the surface, the flow is disturbed, resulting in flow path loss or abnormal noise. In the case of a valve sliding surface, additional processing for removal is required. It is a problem for the function, performance, and cost of the product. In order to solve such problems, it is necessary to provide a groove so that the brazing filler metal does not flow directly into the part where the wax leakage is to be prevented or to cool the member to suppress the flow of the wax. (For example, refer to Patent Document 1).

JP-A-6-81983 (first page, FIG. 1)

  In the conventional technology as described above, when the brazing material is excessively supplied, the brazing material overflowing from the groove may flow into the place where the brazing leakage is not required, and the brazing flow is controlled by cooling. In the method of preventing leakage, it is difficult to control the temperature so that the freezing point of the brazing material comes between the brazing leakage-free portion and the brazing portion. For this reason, there has been a problem that wax leakage cannot be reliably prevented and defects occur at a certain rate and need to be reworked.

This invention has been made to solve the problems as described above, braze joint leakage of brazing material to braze leakage useless portion reliably prevented, the electromagnetic BenSo location using the braze joints It is intended to provide.

In the brazed joint according to the present invention, one end of a second member made of a pipe material or a ring-shaped member is inserted into the groove of the first member in which an annular groove is provided around the hole, and brazed and joined. a Taro-formed joint, the brazing material wicking height from the bottom portion of the groove due to capillary action in the gap between the side peripheral surface of the outer diameter side of the outer peripheral surface and the groove of the one end portion of the second member, The first member so as to be higher than the brazing material suction height from the bottom of the groove due to capillary action in the gap between the inner peripheral surface of the one end of the second member and the side peripheral surface on the inner diameter side of the groove. wherein the second member is disposed, said one end portion of the second member is inclined so that the inner circumferential surface becomes thinner in the end direction, the one end brazing material that is melted at the bottom of the groove and It is characterized in that the outer peripheral surface portion of the portion is in contact .
Further, the electromagnetic valve device according to the present invention is a metal provided with a main flow path, a hole for slidably holding a main valve body that opens and closes the main flow path, and an annular groove formed around the hole. A first member comprising a main block made of
A pilot solenoid valve that is provided to communicate with the hole and that controls the main valve body to open and close by generating a differential pressure in the main valve body;
A second member formed in a ring shape and having one end in the axial direction inserted into the groove and fixed to the first member by brazing, and an inner peripheral portion holding the pilot solenoid valve; a solenoid valve device, the brazing material wicking height from the bottom portion of the groove due to capillary action in the gap between the side peripheral surface of the outer diameter side of the outer peripheral surface and the groove of the one end portion of the second member, The first member so as to be higher than the brazing material suction height from the bottom of the groove due to capillary action in the gap between the inner peripheral surface of the one end of the second member and the side peripheral surface on the inner diameter side of the groove. wherein the second member is disposed, said one end portion of the second member is inclined so that the inner circumferential surface becomes thinner in the end direction, the one end brazing material that is melted at the bottom of the groove and It is characterized in that the outer peripheral surface portion of the portion is in contact .

In the brazed joint of the present invention, from the bottom of the groove due to capillary action in the gap between the outer peripheral surface of one end of the second member inserted into the groove of the first member and the side peripheral surface on the outer diameter side of the groove. braze wicking height is higher than the brazing material wicking height from the bottom portion of the groove due to capillary action in the gap between the inner peripheral surface and the inner diameter side of the side peripheral surface of the groove of the end portion of the second member The first member and the second member are arranged so that the one end portion of the second member inserted into the groove is inclined so that the inner peripheral surface becomes thinner toward the end portion. In addition, since the outer peripheral surface portion of the one end is in contact with the brazing material melted at the bottom of the groove, it is possible to provide an effect of providing a brazed joint that reliably prevents the leakage of the brazing material.
Further, according to the electromagnetic valve device of the present invention, a ring is formed with respect to the groove of the first member made of a metal main block provided with an annular groove around a hole which is a sliding hole of the main valve body. At the place where one end portion in the axial direction of the second member made of a nest that holds the pilot solenoid valve at the inner peripheral portion is inserted into the groove and fixed to the first member by brazing, braze wicking height from the bottom portion of the groove due to capillary action in the gap between the side peripheral surface of the outer diameter side of the outer peripheral surface and the groove of the one end, the inner circumferential surface of the end portion of the second member The first member and the second member are disposed so as to be higher than the brazing material suction height from the bottom of the groove due to capillarity in the gap between the inner peripheral side surface of the groove and the groove, and the groove As for the said one end part of the said 2nd member inserted in, an internal peripheral surface becomes thin in the edge part direction Is inclined to, the so outer peripheral surface portion of said one end portion to the brazing material that is melted at the bottom of the groove is in contact, the leakage of the brazing material into the hole a slide hole of the main valve body is caused Thus, it is possible to provide an electromagnetic valve device that reliably prevents the occurrence of the problem.

It is sectional drawing which shows roughly the condition before the heating of the brazing joint which concerns on Embodiment 1 of this invention, and a brazing method. It is principal part sectional drawing which shows roughly the example which applied the solenoid valve apparatus which concerns on Embodiment 2 of this invention to the valve block for package air conditioners.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view schematically showing a state before heating in a brazing joint and a brazing method according to Embodiment 1 of the present invention. In the figure, the first member constituting the brazed joint is a metal block 1 such as aluminum, brass, copper, or stainless steel that constitutes a valve block (not shown) used here for flow path control of the refrigerant circuit and the like. Consists of. Here, the second member 2 constituting the brazed joint is made of a metal pipe material such as aluminum, copper, or iron. The metal block 1 schematically shows only the main part of the joint portion connecting the input / output pipes in the metal body body of the valve block. The metal block 1 is provided with a channel hole 1a communicating with the channel 2a of the second member 2 and an annular groove 3 formed around the hole 1a.

  The inner diameter of the flow path 2a excluding the joining portion of the second member 2 to the metal block 1 and the inner diameter of the hole 1a of the metal block 1 are substantially the same. One end portion (lower end portion in the figure) of the second member 2 that is a connection portion with the metal block 1 is expanded so that it can be inserted into the annular groove 3. Specifically, the gap between the outer peripheral surface of the expanded portion 21 of the second member and the side peripheral surface on the outer diameter side of the groove 3 is about 10 to 150 μm at the brazing temperature. The tube is expanded so that the gap between the inner peripheral surface of the portion 21 and the side peripheral surface on the inner diameter side of the groove 3 is 300 μm or more at the brazing temperature. And the front-end | tip part 21a of the one end part which consists of the pipe expansion part 21 of the 2nd member 2 is inclined in the taper shape so that an internal peripheral surface may become thin in the edge part direction in this example.

  In addition, the width of the groove 3 is calculated in advance so as to be a thickness that allows for the thickness of the expanded portion 21 at the brazing temperature, the total dimension of the gap between the inner diameter side and the outer diameter side, and a dimension that allows for processing errors. Is done. The second member 2 and the metal block 1 having the annular groove 3 are processed as described above. After the ring-shaped brazing material 4 is installed at the bottom of the groove 3, the expanded portion 21 of the second member 2 is illustrated. 1 is inserted into the groove 3. In addition, about the volume of the brazing material 4, the gap | interval volume under brazing temperature outside the pipe expansion part 21 of the 2nd member 2 calculates | requires the maximum value in consideration of a tolerance, and makes it about 3 to 5 times that It is desirable.

  Next, the brazing process will be described. The joint portion shown in FIG. 1 configured as described above is heated by a conventional method to melt the brazing material 4. The heating means, heating temperature, heating time, etc. are not particularly limited, and for example, the brazing material 4 to be used may be under the conditions specified by the brazing material manufacturer. The brazing material 4 melted at the time of heating may be a gap formed between the outer peripheral surface of the outer diameter side of the groove 3 and the outer peripheral surface of the expanded tube portion 21, or the inner peripheral surface of the expanded tube portion 21 and the inner peripheral surface of the groove 3. However, the outer peripheral surface portion melts before the inner peripheral surface because the outer end surface of the expanded pipe portion 21 is inclined so as to become longer toward the bottom of the groove 3. The brazing material 4 is brought into contact with the brazing material 4, and the brazing material 4 is sucked by the capillary force of the gap formed between the outer peripheral surface of the outer diameter side of the groove 3 and the outer peripheral surface of the expanded pipe portion 21, and brazing is performed. As a result, the brazing material 4 hardly flows into the gap on the inner peripheral surface side of the expanded pipe portion 21, so that the brazing material 4 does not leak over the upper edge portion 3a of the groove 3 into the inner surface of the hole 1a serving as a flow path. .

  Moreover, even if the molten brazing material reaches the gap on the inner peripheral surface side of the expanded pipe portion 21, the inner peripheral surface and the groove of the expanded portion 21 with respect to the gap of 10 to 150 μm on the outer peripheral surface side of the expanded pipe portion 21. Since the clearance between the inner peripheral side and the peripheral surface of the inner diameter side of 3 is increased to 300 μm or more, the brazing material suction height from the bottom of the groove 3 due to the capillary force is lower than the clearance on the outer peripheral surface side of the expanded portion 21. Even by this difference in the gap, the brazing material 4 is prevented from flowing into the gap on the inner peripheral surface side of the expanded pipe portion 21. Further, whether or not brazing has been completed normally can be confirmed by whether or not the brazing material has oozed out into the gap on the outer peripheral side of the expanded pipe portion 21. In the case of brazing that requires flux, it is desirable to supply the flux only to the outer peripheral surface of the outer diameter side of the groove 3 and the outer peripheral surface of the expanded pipe portion 21.

  As described above, according to the first embodiment, the inner and outer peripheral surfaces of the expanded portion 21 of the second member 2 to be inserted into the groove 3 in which the brazing material 4 of the metal block 1 as the first member is loaded. Since the gap between the groove 3 and the side peripheral surface of the groove 3 is configured so that a difference occurs in the suction height of the brazing material from the bottom of the groove due to capillary action on the inner side and the outer side, Only by selecting the side on which the capillary force is reduced, the effect of providing a brazed joint that reliably prevents leakage of the brazing material can be obtained.

  In the first embodiment, in order to ensure the effect of preventing the leakage of the brazing material, the tip of the expanded portion 21 of the second member 2 is inclined and tapered, and the inner peripheral side and the outer peripheral side with respect to the groove 3 are processed. However, a corresponding effect can be expected with only one of them. For example, when the gap between the inner peripheral side and the outer peripheral side with respect to the groove 3 is changed, the tip of the pipe expanding portion 21 may not be inclined. Moreover, when the front-end | tip of the pipe expansion part 21 of the 2nd member 2 is inclined in a taper shape, the clearance gap between an inner peripheral side and an outer peripheral side may be the same.

  In addition, since the amount of brazing material 4 loaded can be defined in advance, the brazing material 4 does not overflow from the groove 3 due to excessive supply of the brazing material 4. Accordingly, there is no need for cooling, and it is possible to visually check whether the brazing material is sufficiently flowing by confirming from the outside of the joint whether or not the brazing material that has creeped up has leaked out, so that it is easy to manage the bonding quality. Further, since the flow control using the brazing material and the capillary force is performed so that the brazing material does not flow into the place where the brazing material is not used, it is possible to prevent an increase in the cost of removing the leaking brazing material.

Embodiment 2. FIG.
FIG. 2 is a cross-sectional view of an essential part schematically showing an example in which the electromagnetic valve device according to Embodiment 2 of the present invention is applied to a valve block for a packaged air conditioner. In the figure, the electromagnetic valve device is provided with a main flow path 5a, a hole 5b consisting of a sliding hole for slidably holding a main valve body 6 that opens and closes the main flow path 5a, and an annular groove 3A around the hole 5b. The main valve body 6 opens and closes the main flow path 5a by generating a differential pressure above and below the main valve body 6 provided to communicate with the metal main block (first member) 5 and the hole 5b. The pilot solenoid valve 7 to be controlled and the main block 5 and the pilot solenoid valve 7 are brazed and joined to the groove 3A of the main block 5, and the pilot solenoid valve 7 is held by a metal seal structure. A second member 8 made of a nested ring is provided. The main flow path 5a is used such that the left side in the figure is the high pressure side A and the right side is the low pressure side B.

  The pilot electromagnetic valve 7 includes a pilot valve 71 held on the second member 8 by a metal seal structure, and an electromagnetic coil 72 for opening and closing the valve body 71a of the pilot valve 71. The outer peripheral surface of the main valve body 6 is formed in a concavo-convex shape in the circumferential direction so as to form a predetermined gap through which a working fluid (not shown) can pass, between the inner peripheral surface of the hole 5b. The space formed by the hole 5b in the upper part of the main valve body 6 is communicated with the low pressure side B of the main flow path 5a through a pilot hole 5c narrower than the main flow path 5a. The pilot hole 5c is configured so as to be opened and closed by the valve body 71a via the pilot electromagnetic valve 7. Further, the pilot hole 5c is sealed so as to maintain airtightness to the outside while passing through the main block 5 and the pilot electromagnetic valve 7, and a part of the sealing means is not shown.

  The main block 5 corresponds to the metal block 1 which is the first member in the first embodiment, and the hole 5b formed of a sliding hole corresponds to the hole 1a in the first embodiment. An annular groove 3A is formed around the hole 5b. And the 2nd member 8 formed in the ring shape is corresponded to the 2nd member 2 in Embodiment 1, and as for the part inserted in the groove | channel 3A of the 2nd member 8, an internal peripheral surface is an edge part direction. The taper is inclined so as to be thin. And the brazing material 4A is loaded in advance at the bottom of the groove 3A. The gap between the outer peripheral surface of the second member 8 and the side peripheral surface on the outer diameter side of the groove 3A of the main block 5 is 10 μm in order to secure the brazing material suction height from the bottom of the groove 3A by capillary force. It is desirable to be about ~ 150 μm.

  Next, the brazing process will be described. The brazing material 4A is inserted into the groove 3A of the main block 5, and one end portion (the lower end portion in the figure) of the second member 8 is inserted into the groove 3A and heated by heating means (not shown), The brazing material 4A is melted. The molten brazing material at this time is a gap formed between the outer peripheral surface of the outer diameter side of the groove 3A and the outer peripheral surface of the second member 8, or the bottom surface of the tip of the inclined surface of the second member 8 and the groove 3A of the main block 5. However, since the outer peripheral surface of the second member 8 is inclined so as to extend downward in the figure, this portion comes into contact with the molten brazing material, and the groove The brazing material is sucked by the capillary force of the gap generated between the side peripheral surface of the outer diameter side of 3A and the outer peripheral surface of the second member 8, and brazing is performed.

  Since the brazing material suction height from the bottom of the groove 3A due to capillary action is high on the outer peripheral side and low on the inner peripheral side, there is a concern that the brazing material will flow into the mating portion C where the bottom surface of the second member 8 contacts the main block 5 There is no. Whether or not brazing has been normally completed can be confirmed by checking whether or not the brazing material has oozed out in the gap around the outer periphery of the second member 8. In the case of brazing that requires flux, it is desirable to supply flux only to the outer peripheral surface of the groove 3A and the outer peripheral surface of the second member 8.

  Next, the operation of the electromagnetic valve device configured as shown in FIG. 2 will be described. When the main valve body 6 is closed with the flow path on the left side of the main flow path 5a (high pressure side A) at a higher pressure than the flow path on the right side (low pressure side B), the pilot solenoid valve 7 is also closed. However, when the coil 72 is energized to open the valve body 71a of the pilot solenoid valve 7, a differential pressure is generated and a flow through the pilot valve 71 is generated in the gap between the main valve body 6 and the hole 5b. . At this time, a differential pressure is generated due to a flow path loss in the lower and upper portions of the gap, and the valve upper pressure is lower than the inlet side pressure. Due to this differential pressure, the main valve body 6 is sucked upward in the figure, so that the main valve body 6 is opened.

  Since the electromagnetic valve device according to the second embodiment has the mechanism as described above, the hole 5b of the main block 5 through which the main valve body 6 slides must be smooth. On the other hand, the pilot valve 71 and the main block 5 are attached by screwing, and the airtightness is a metal seal structure obtained by pressing each of them. Refrigerant circuit components tend to be aluminized due to the recent market demand for cost reduction, but aluminum seals are rough and the sealing surface is roughened and pressed tightly while rotating and sliding. Therefore, the second member 8 made of nest is provided in the metal seal portion of the main block 5 and is changed to a material capable of metal seal such as stainless steel, thereby ensuring airtightness.

  In this case, the second member 8 and the main block 5 must be brazed by using a nested structure. Since the joint portion by brazing includes the hole 5b of the main valve body 6, it is necessary to avoid the occurrence of brazing leakage in the hole 5b. There was a problem that the cost was high in order to remove the leaked brazing material after cutting. However, according to the second embodiment of the present invention, the groove 3A is provided around the hole 5b of the main block 5, and the minimum amount of brazing material 4A is loaded at the bottom of the groove 3A to form a ring shape. By inclining the inner peripheral surface of one end of the second member 8 into a taper shape and inserting it into the groove 3A, the melted brazing material at the time of brazing can be removed from the bottom of the groove due to capillary action on the outer peripheral surface side. Since the brazing material suction height is increased, it is possible to reliably prevent the molten brazing material from leaking to the hole 5b side.

  As described above, according to the second embodiment, the groove of the first member including the metal main block 5 provided with the annular groove 3A around the hole 5b which is the sliding hole of the main valve body 6 is provided. A portion that is formed in a ring shape with respect to 3A and is inserted into the groove 3A by brazing and fixing one end portion in the axial direction of the second member 8 that is a nest that holds the pilot solenoid valve 7 at its inner peripheral portion. The height of the brazing material sucked from the bottom of the groove 3A due to capillary action in the gap between the outer peripheral surface of the one end of the second member 8 and the side peripheral surface on the outer diameter side of the groove 3A is Since the brazing material suction height from the bottom of the groove 3A due to the capillary phenomenon in the gap between the inner peripheral surface of the one end and the inner peripheral side of the groove 3A is set higher, the sliding hole of the main valve body 6 It can be said that it is possible to provide an electromagnetic valve device that reliably prevents the leakage of brazing material in a hole 5b. Results can be obtained.

  It should be noted that within the scope of the present invention, a part or all of each embodiment can be freely combined, or each embodiment can be appropriately modified or omitted.

  DESCRIPTION OF SYMBOLS 1 Metal block (1st member), 1a Hole, 2 2nd member, 2a Flow path, 21 Pipe expansion part, 21a Tip part, 3, 3A Groove, 3a Upper edge part, 4, 4A Brazing material, 5 Main block ( 1st member), 5a main flow path, 5b hole, 5c pilot hole, 6 main valve body, 7 pilot solenoid valve, 71 pilot valve, 71a valve body, 72 electromagnetic coil, 8 second member (nesting), A high pressure side, B Low pressure side, C mating part.

Claims (4)

A brazed joint in which one end of a second member made of a pipe material or a ring-shaped member is inserted into the groove of the first member provided with an annular groove around the hole,
The brazing material suction height from the bottom of the groove due to capillarity in the gap between the outer peripheral surface of the one end of the second member and the side peripheral surface on the outer diameter side of the groove is the one end of the second member. The first member and the second member are higher than the brazing material suction height from the bottom of the groove due to capillary action in the gap between the inner peripheral surface of the portion and the side peripheral surface on the inner diameter side of the groove. Arranged ,
Wherein one end of said second member is inclined so that the inner circumferential surface becomes a thin endwise, as the outer peripheral surface portion of said one end portion to the brazing material that is melted at the bottom of the groove is in contact A brazed joint characterized by Side outer circumferential surface of the second member, the side of the gap opposite to the side peripheral surface of the outer diameter side of the groove, the inner circumferential surface of the second member, which faces the side circumferential surface of the inner diameter side of said groove The brazed joint according to claim 1, wherein the brazed joint is smaller than the gap .   The brazing joint according to claim 2, wherein a side to be reduced is set to 10 to 150 µm and a side to be increased is set to 300 µm or more at the brazing temperature. A first member comprising a main channel, a hole for slidably holding a main valve element that opens and closes the main channel, and a metal main block provided with an annular groove formed around the hole;
A pilot solenoid valve that is provided to communicate with the hole and that controls the main valve body to open and close by generating a differential pressure in the main valve body;
A second member formed in a ring shape and having one end in the axial direction inserted into the groove and fixed to the first member by brazing, and an inner peripheral portion holding the pilot solenoid valve;
A solenoid valve device comprising:
The brazing material suction height from the bottom of the groove due to capillarity in the gap between the outer peripheral surface of the one end of the second member and the side peripheral surface on the outer diameter side of the groove is the one end of the second member. The first member and the second member are higher than the brazing material suction height from the bottom of the groove due to capillary action in the gap between the inner peripheral surface of the portion and the side peripheral surface on the inner diameter side of the groove. Arranged ,
Wherein one end of said second member is inclined so that the inner circumferential surface becomes a thin endwise, as the outer peripheral surface portion of said one end portion to the brazing material that is melted at the bottom of the groove is in contact A solenoid valve device characterized by that.

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