JP2022161271A - Check valve and refrigeration cycle system - Google Patents

Abstract

To provide a check valve and a refrigeration cycle system capable of improving the valve leakage resistance during closing the valve.SOLUTION: A check valve 1 includes an outer pipe part 12, a valve body 13, and a valve element 14, the valve body 13 having a valve seat part 16, and a valve port 17, the valve seat part 16 having a valve seat side seating surface 161 around the valve port 17, on which the valve element 14 can be seated, the valve element 14 having a valve element side seating surface 141 on which it can be seated in face contact with the valve seat side seating surface 161. At a position communicated with a contact area 18 where the valve seat side seating surface 161 and the valve element side seating surface 141 contact each other, an oil reservoir part 19 is provided which can reserve oil.SELECTED DRAWING: Figure 1

Description

The present invention relates to check valves and refrigeration cycle systems.

Conventionally, a check valve includes a body joint (outer pipe) having a valve chamber formed therein, a valve seat member fixed inside the body joint, and a valve body movably provided in the valve chamber. is known (see, for example, Patent Literature 1). In this check valve, the valve body is seated on the valve seat surface of the valve seat member to prevent backflow of the fluid.

JP 2010-138927 A

In recent years, there has been a demand for improved performance of refrigerating cycle equipment, and the fluid environment in the refrigerating cycle has often become more severe (for example, higher pressure). Accordingly, check valves are also required to have improved valve leakage performance (performance to prevent valve leakage) when the valve is closed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a check valve and a refrigeration cycle system capable of improving valve leakage performance when the valve is closed.

A check valve according to the present invention includes a cylindrical outer tube portion extending in an axial direction, a valve body assembled to the outer tube portion, and a valve body provided on the valve body, and is used for fluid containing oil. in a predetermined forward direction to prevent reverse flow, wherein the valve body includes a valve seat portion on which the valve body can be seated, and the valve body seated on the valve seat portion The valve seat portion is provided with a valve seat side seating surface on which the valve body can be seated around the valve mouth, and the valve body is provided with a valve seat side seating surface on which the valve body can be seated. A valve-side seating surface that can be seated in surface contact with the seating surface is provided, and at least one of the valve-side seating surface and the valve-side seating surface, or the valve-side seating surface and the valve-side seating surface An oil reservoir capable of storing the oil is provided in at least one of a position communicating with the contact portions that contact each other and the valve body side seating surface.

According to the present invention, when the valve body is seated, the oil in the fluid stored in the oil reservoir is supplied between the seating surfaces due to the surface tension of the fluid, thereby enhancing the adhesion between the seating surfaces. Therefore, it is possible to improve the valve leakage performance when the valve is closed. In addition, although fine dust may be contained in the fluid, according to the present invention, since such dust can be collected in the oil reservoir, the dust is trapped between the seating surfaces. It is also possible to suppress a decrease in adhesion.

At this time, it is preferable that the oil reservoir is configured by an annular groove having a diameter larger than the diameter of the valve port. According to this configuration, since the oil reservoir is formed by the annular groove, the oil in the fluid is collected in the annular groove substantially uniformly in the circumferential direction and supplied between the seating surfaces. The Rukoto. As a result, the tight contact between the seating surfaces can be improved substantially uniformly in the circumferential direction, so that the valve leakage performance when the valve is closed can be further improved.

Moreover, it is preferable that the valve main body has a valve holder portion that is formed in a cylindrical shape rising from the periphery of the valve seat side seating surface and that guides the valve body in the axial direction. According to this configuration, the opening and closing movement of the valve body in the axial direction can be facilitated by the guide of the valve body by the cylindrical valve holder portion.

At this time, it is preferable that the oil reservoir portion is configured by a groove formed in an internal corner portion between the valve seat side seating surface and the valve holder portion. According to such a configuration, the oil stored in the oil reservoir portion is prevented from flowing out to the radially outer side opposite to the valve port on the radially inner side by the inner surface of the valve holder portion surrounding the radially outer side. It is possible to increase the accuracy of the oil supply between the surfaces. As a result, it is possible to improve the accuracy of improving the adhesion between the seating surfaces, so that it is possible to further improve the valve leakage performance when the valve is closed. In addition, since the groove is formed in the internal corner, compared to the case where the internal corner is formed with an R portion, the valve body side seating surface of the valve body rides on the R portion, resulting in improved adhesion between the seating surfaces. is effectively avoided. In other words, it is possible to further improve the valve leakage performance in terms of avoiding the run-on.

Furthermore, it is preferable that the groove of the internal corner portion is recessed in the axial direction from the seating surface on the valve seat side. According to this configuration, machining of the groove in the axial direction of the cylindrical valve holder portion is facilitated in terms of tool accessibility and the like, so machining costs can be reduced.

Moreover, it is also preferable that the groove of the internal corner portion is recessed radially outward from the inner peripheral surface of the valve holder portion. According to this configuration, when the check valve is used in a vertical arrangement in which the shaft of the check valve faces the vertical direction, the oil tends to flow out from the groove even if the groove is not filled with oil. It is possible to increase the accuracy of the oil supply to the As a result, it is possible to further improve the valve leakage performance when the valve is closed.

Moreover, it is preferable that the width dimension of the groove of the internal corner portion is larger than the dimension of the gap between the valve body and the valve holder portion, and is larger than 0.1 mm and smaller than 2 mm. Since the width dimension of the groove at the inner corner is larger than the above clearance dimension, when the groove is formed in the axial direction, the valve body side seating surface of the valve body surely overlaps with the groove. It is possible to increase the accuracy of the oil supply to the In addition, when the groove is formed radially outward, the above-mentioned gap dimension, which is the distance between the groove and the peripheral surface of the valve body, is kept small. It is possible to increase the accuracy of the oil supply between the surfaces. In addition, in general, the radius of the rounded portion formed at the inner corner between the bottom surface and the inner peripheral surface during the forming process of the inner surface of the cylinder is approximately 0.1 mm to 0.2 mm. Therefore, by forming the groove of the internal corner with a width larger than 0.1 mm and smaller than 2 mm, the R portion of the internal corner is substantially removed, and the R portion of the valve body side seating surface is formed. It is possible to more effectively avoid a decrease in the adhesion between the seating surfaces due to the riding on the seat surfaces.

A refrigeration cycle system according to the present invention includes any one of the check valves described above.

According to the present invention, since the above-described check valve is adopted in the refrigeration cycle system, the valve leakage performance of the check valve when the valve is closed can be improved. , there is no deterioration in energy saving or refrigeration efficiency.

According to the check valve and refrigeration cycle system of the present invention, it is possible to improve valve leakage performance when the valve is closed.

1 is an overall cross-sectional view showing a cross-section along an axial direction of a check valve according to a first embodiment; FIG. FIG. 2 is an enlarged cross-sectional view showing an enlarged oil reservoir portion shown in FIG. 1 and further moving the valve body to the left end of the drawing in the radial direction inside the valve holder; FIG. 5 is a cross-sectional view showing a cross-section along the axial direction of a valve body and a valve body, which are essential parts of a check valve according to a second embodiment; FIG. 4 is an enlarged cross-sectional view showing an enlarged oil reservoir shown in FIG. 3 and further moving the valve body to the left end of the drawing in the radial direction inside the valve holder; FIG. 5 is a cross-sectional view showing a cross-section along the axial direction of a valve main body and a valve body, which are essential parts of a check valve according to a first modified example; FIG. 11 is a cross-sectional view showing a cross-section along the axial direction of a valve body and a valve body, which are main parts of a check valve according to a second modified example; FIG. 11 is a cross-sectional view showing a cross-section along the axial direction of a valve body, which is a main part of a check valve according to a third modified example; FIG. 11 is a cross-sectional view showing a cross-section along the axial direction of a portion around an oil reservoir, which is a main part of a check valve according to a fourth modified example; FIG. 9 is a diagram showing a refrigeration cycle system according to an embodiment to which various check valves shown in FIGS. 1 to 8 are commonly applied;

A check valve according to an embodiment of the present invention will be described below. First, the check valve of the first embodiment will be described with reference to FIGS. 1 and 2. FIG.

FIG. 1 is an overall cross-sectional view showing a cross section along the axial direction of the check valve according to the first embodiment.

The check valve 1 of the present embodiment is installed and used in the middle of a refrigerant flow path in a refrigeration cycle system, as will be described later in detail, and the refrigerant containing oil for lubricating the compressor flows as a fluid. . This check valve 1 permits the flow of fluid (positive flow in the positive direction) from the primary side (lower side in FIG. 1) to the secondary side (upper side in FIG. 1) and allows it to pass through. It is a valve device that prohibits and blocks the flow of fluid to the side (reverse flow in the opposite direction). The check valve 1 includes a cylindrical outer tube portion 12 extending in the axial direction along the axis L, a valve body 13 assembled to the primary side of the outer tube portion 12, and a valve body 14 provided in the valve body 13. , is equipped with The valve main body 13 is a member made of brass or the like in which a cylindrical valve holder portion 15 that supports the valve element 14 and a valve seat portion 16 on which the valve element 14 can be seated are integrally formed. The valve seat portion 16 is assembled so as to close the opening on the primary side of the cylindrical outer tube portion 12, and the valve seat portion 16 is formed with a valve port 17 that is closed by the seated valve element 14. . Further, a primary joint pipe 1 a is connected to the valve seat portion 16 so as to communicate with the valve port 17 . On the other hand, the opening on the secondary side of the cylindrical outer tube portion 12 is closed by a closing portion 121 having an opening in the center. A joint pipe 1b is connected.

Further, the valve seat portion 16 is provided with a valve seat side seating surface 161 around the valve port 17 on which the valve body 14 can be seated. The valve holder portion 15 is formed in a cylindrical shape rising from the periphery of the valve seat side seating surface 161 . A cylindrical valve body 14 is housed inside the cylindrical valve holder portion 15 so as to be movable in the axial direction D11. A valve body side seating surface 141 that can be seated in surface contact with a valve seat side seating surface 161 of the valve seat portion 16 is provided at the primary side end portion of the valve body 14 . In this embodiment, the primary side end of the valve body 14 is formed with a dish-shaped recess 142 for receiving the forward flow of fluid flowing out from the valve port 17, and an annular flat plate surrounding the recess 142 is formed. The surface serves as a valve body side seating surface 141 . The annular valve-side seating surface 141 has an inner diameter larger than the diameter φ11 of the valve port 17, and is configured to reliably make surface contact with the valve-seat-side seating surface 161 so that it can be seated. Note that "φ11" is not a dimension notation but an identification code indicating the diameter of the valve port 17 in FIG. On the other hand, the outer diameter of the cylindrical valve body 14 including the valve body side seating surface 141 is slightly smaller than the inner diameter of the valve holder portion 15, and the valve body 14 moves inside the valve holder portion 15 in the axial direction D11. It is designed to be flexible. With such a configuration, the valve body 14 has a valve closed position where the valve body side seating surface 141 is in surface contact with the valve seat side seating surface 161 and is seated on the valve seat portion 16 in the valve holder portion 15, and a valve seat portion 16 and a valve open position away from 16 in the axial direction D11.

The valve holder portion 15 of the valve main body 13 is provided with a plurality of communication holes 151 that penetrate the cylindrical peripheral surface in the radial direction. It communicates with the inside of the tube portion 12 . The communication hole 151 is formed in a circular shape when viewed from the side. That is, the communication hole 151 is formed by drilling the valve holder portion 15 from the direction orthogonal to the axis using a drill or the like. A substantially annular valve stopper 152 made of SUS is attached to the inner surface of the valve holder portion 15 near the secondary end. When the valve body 14 moved away from the valve seat portion 16 and moved to the valve-open position by being pushed by the fluid from the valve port 17 contacts the valve stopper 152, the valve body 14 moves toward the secondary side from the valve-open position. movement is restricted. As the valve stopper 152, specifically, a C-shaped retaining ring is employed. The valve open position is a position where the valve body 14 is separated from the valve seat portion 16 and the valve body 14 is in contact with the valve stopper 152 . is the position (the maximum position in the secondary side direction in the valve stroke) where the movement of is restricted.

When the check valve 1 is used in the vertical position shown in FIG. 1, it operates as follows. First, when the valve body 14 is seated and in the valve closed position, when the fluid flows forward from the primary side to the secondary side, the valve body 14 pushed by the fluid flowing out from the valve port 17 is pushed by the valve stopper. 152 to the valve open position. When the forward flow stops, the valve element 14 drops by its own weight and moves to the valve closed position where it is seated on the valve seat portion 16 .

The check valve 1 operates as follows when it is placed horizontally or vertically upside down from that shown in FIG. First, at the valve closed position, the pressure on the secondary side is set higher than that on the primary side, and the valve body 14 is pressed against the valve seat portion 16 by the differential pressure at this time to maintain the seated state. In this state, when the fluid flows forward from the primary side to the secondary side, the valve element 14 pushed by the fluid flowing out from the valve port 17 moves to the valve open position where it abuts against the valve stopper 152 . When the valve is closed, the pressure on the secondary side is made higher than that on the primary side, so that the differential pressure moves the valve body 14 to the valve closed position where it is seated on the valve seat portion 16 .

Here, at least one of the position communicating with the contact portion 18 where the valve seat side seating surface 161 and the valve body side seating surface 141 contact each other and the valve body side seating surface 141, in this embodiment, only the position communicating with the contact portion 18 is provided with an oil reservoir 19. The oil reservoir portion 19 is a portion that can store oil contained in the fluid flowing through the check valve 1 and will be described in detail below.

FIG. 2 is an enlarged cross-sectional view of the oil reservoir shown in FIG. 1, with the valve body moved radially toward the left end of the drawing inside the valve holder.

As shown in FIG. 2 , the oil reservoir 19 is formed by a groove formed at a position communicating with the contact portion 18 , specifically a valve seat side seating surface 161 of the valve seat portion 16 of the valve main body 13 . and the groove formed in the internal corner portion 131 of the valve holder portion 15 . The groove serving as the oil reservoir 19 has an annular bottom having a diameter φ12 larger than the diameter φ11 of the valve port 17 (as described above, "11" is a part of the identification code "φ11"). It has become a ditch. As with "φ11", "φ12" is not a dimension notation but an identification code indicating the diameter of the valve port 17 in FIG. It is part. An annular groove serving as the oil reservoir portion 19 formed in the internal corner portion 131 is recessed from the inner peripheral surface of the valve holder portion 15 to the outside in the radial direction D12 over the entire circumference.

Further, the width dimension W11 of the groove as the oil reservoir portion 19 is larger than the gap dimension t11 between the valve body 14 and the valve holder portion 15, and is larger than 0.1 mm and smaller than 2 mm. there is Here, the clearance dimension t11 is the dimension of the clearance on the right side between the valve body 14 and the valve holder portion 15 when the valve body 14 is moved to the left end in the diagram in the radial direction D12 in the valve holder portion 15, that is, It means the difference between the inner diameter of the valve holder portion 15 and the outer diameter of the valve body 14 . The width dimension W11 of the groove is preferably formed to be larger than 0.2 mm and smaller than 0.5 mm in this range.

Further, the depth dimension DP11 of the groove as the oil reservoir portion 19 is formed to be larger than 0.2 mm and smaller than 3 mm. The depth dimension DP11 of the groove is preferably formed to be larger than 0.2 mm and smaller than 1 mm in this range. Furthermore, the depth dimension DP11 of this groove is formed to be larger than 1/4 of the width dimension W11 and smaller than 4 times the width dimension W11. The depth dimension DP11 of the groove is preferably formed to be larger than 1/4 of the width dimension W11 and smaller than 1 time of the width dimension W11 in this range.

According to the check valve 1 of the first embodiment described with reference to FIGS. 1 and 2, the surface tension of the oil in the fluid accumulated in the oil reservoir 19 causes the oil in the fluid to move from the seating surface of the valve body 14 to the seating surface. By supplying it between them, it is possible to enhance the adhesion between the seating surfaces. As a result, it is possible to improve the valve leakage performance of the check valve 1 when the valve is closed. In addition, although fine dust may be contained in the fluid, according to the present embodiment, since such dust can be collected in the oil reservoir portion 19, it is possible to prevent dust from being caught between the seating surfaces. It is also possible to suppress the decrease in adhesion caused by.

In this embodiment, the oil reservoir 19 has a diameter φ12 (“12” as described above) which is larger than the diameter φ11 (“11” is part of the identification code “φ11” as described above) of the valve port 17 . is a part of the identification code "φ12"). According to this configuration, since the oil reservoir portion 19 is formed of an annular groove, the oil in the fluid is collected in the annular groove substantially uniformly in the circumferential direction and supplied between the seating surfaces. It will be done. As a result, the tight contact between the seating surfaces can be improved substantially uniformly in the circumferential direction, so that the valve leakage performance when the valve is closed can be further improved.

In addition, in this embodiment, the valve body 13 has the valve holder portion 15 formed in a cylindrical shape rising from the periphery of the valve seat side seating surface 161 . According to this configuration, the opening and closing movement of the valve body 14 in the axial direction D11 can be facilitated by the guide of the valve body 14 by the cylindrical valve holder portion 15 .

Further, in this embodiment, the oil reservoir portion 19 is configured by a groove formed in the internal corner portion 131 between the valve seat side seating surface 161 and the valve holder portion 15 . According to such a configuration, the oil stored in the oil reservoir portion 19 is prevented from flowing out to the radially outer side opposite to the valve port 17 on the radially inner side by the inner surface of the valve holder portion 15 surrounding the radially outer side. Therefore, it is possible to improve the accuracy of oil supply between the seating surfaces. As a result, it is possible to improve the accuracy of improving the adhesion between the seating surfaces, so that it is possible to further improve the valve leakage performance when the valve is closed. In addition, since the groove is formed in the internal corner portion 131, compared to the case where the internal corner portion 131 is formed with the R portion, the seating surface of the valve body 14 on the side of the valve body 14 rides on the R portion to be seated. This effectively avoids the possibility that the adhesion between the surfaces is lowered. In other words, it is possible to further improve the valve leakage performance in terms of avoiding the run-on.

Further, in the present embodiment, the groove of the internal corner portion 131 is recessed outward in the radial direction D<b>12 from the inner peripheral surface of the valve holder portion 15 . According to this configuration, when the check valve 1 is used in a vertical arrangement in which the axis L of the check valve 1 faces the vertical direction, the oil tends to flow out from the groove even if the groove is not filled with oil. It is possible to increase the accuracy of the oil supply between the surfaces. As a result, it is possible to further improve the valve leakage performance when the valve is closed.

Further, in this embodiment, the groove width dimension W11 of the internal corner portion 131 is greater than the clearance dimension t11 between the valve body 14 and the valve holder portion 15, and greater than 0.1 mm and less than 2 mm. According to this configuration, the gap dimension t11, which is the maximum distance between the groove and the peripheral surface of the valve body 14, can be kept small. It is possible to improve the accuracy of supply. Further, since the width dimension W11 of the groove is larger than the clearance dimension t11, the spatial volume of the oil reservoir portion 19 is larger than the spatial volume of the vicinity of the seating portion due to the clearance dimension t11. As a result, the oil in the oil reservoir portion 19 is easily supplied between the seating surfaces, and the reliability of the oil supply can be enhanced more effectively. In addition, in general, the radius of the rounded portion formed at the inner corner between the bottom surface and the inner peripheral surface during the forming process of the inner surface of the cylinder is approximately 0.1 mm to 0.2 mm. Therefore, by forming the groove of the internal corner portion 131 with a width greater than 0.1 mm and less than 2 mm, the R portion of the internal corner portion 131 is substantially removed, and the seating surface on the valve body 14 side is formed. It is possible to more effectively prevent deterioration of the adhesion between the seating surfaces due to riding on the R portion.

Moreover, it is preferable that the width dimension W11 of the groove is formed to be larger than 0.2 mm and smaller than 0.5 mm in the range. By making the width dimension W11 larger than 0.2 mm, the general R portion of the internal corner is completely removed, so the deterioration of the adhesion between the seating surfaces due to the valve body side seating surface riding on the R portion can be prevented. can be avoided more effectively. Furthermore, by making the diameter smaller than 0.5 mm, it is possible to secure the guide length for the outer diameter of the valve body, and to stabilize the operability of the valve body.

Further, since the depth DP11 of the groove as the oil reservoir 19 is formed to be larger than 0.2 mm and smaller than 3 mm, the accuracy of oil supply to the seating surface is enhanced. The depth dimension DP11 of the groove is preferably formed to be larger than 0.2 mm and smaller than 1 mm in this range. As a result, the volume of the groove space is not too large and is appropriate, and even with a small amount of oil, the accuracy of oil supply to the seating surface can be further enhanced. Furthermore, since the depth dimension DP11 of this groove is larger than 1/4 of the width dimension W11 and smaller than 4 times the width dimension W11, the accuracy of oil supply to the seating surface is increased. be able to. In this range, the depth dimension DP11 of the groove is preferably formed to be larger than 1/4 of the width dimension W11 and smaller than 1 time of the width dimension W11. As a result, the volume of the groove space is not too large and is appropriate, and even with a small amount of oil, the accuracy of oil supply to the seating surface can be further enhanced.

This completes the description of the first embodiment, and the second embodiment will now be described with reference to FIGS. 3 and 4. FIG. The second embodiment differs from the first embodiment in the position where the oil reservoir is formed. In the following, the second embodiment will be described with a focus on the differences from the first embodiment.

FIG. 3 is a cross-sectional view showing a cross section along the axial direction of a valve main body and a valve body, which are main parts of a check valve according to the second embodiment. 4 is an enlarged cross-sectional view of the oil reservoir shown in FIG. 3, and the valve body inside the valve holder is moved radially toward the left end of the drawing. In addition, in FIGS. 3 and 4, the same reference numerals as in FIGS. 1 and 2 are assigned to the same constituent elements as those of the first embodiment shown in FIGS. , a redundant description of these equivalent components is omitted.

Also in the check valve 2 of the second embodiment, the valve body 14 contacts the inside of the valve holder portion 15 of the valve main body 13 and the valve body side seating surface 141 contacts the valve seat side seating surface 161 of the valve seat portion 16 . and a valve open position in contact with the valve stopper 152 in the axial direction D11. Also in the present embodiment, an oil reservoir 29 is provided in order to improve the valve leakage performance when the valve is closed, but it is formed at the following position, which is different from that of the first embodiment. That is, the oil reservoir portion 29 is formed only on at least one of the valve seat side seating surface 161 and the valve body side seating surface 141 , specifically, the valve seat side seating surface 161 . The oil reservoir portion 29 is a groove that is recessed from the valve seat side seating surface 161 in the axial direction D11 at an internal corner portion 131 between the valve seat side seating surface 161 and the valve holder portion 15 .

The groove as the oil reservoir portion 29 is an annular groove having a diameter φ22 larger than the diameter φ11 of the valve port 17 (as described above, "11" is a part of the identification code "φ11"). It is the same as the first embodiment and has the same effect. It should be noted that "φ22" is also an identification code indicating the diameter of the annular groove serving as the oil reservoir portion 29 in FIG. It is a part of the identification code "φ22". Further, the groove width dimension W21 is larger than the gap dimension t11 between the valve body 14 and the valve holder portion 15, and is larger than 0.1 mm and smaller than 2 mm, particularly larger than 0.2 mm and smaller than 0.5 mm. The point that it is preferable to be small is the same as in the first embodiment, and the effect is also the same. As described in the first embodiment, the gap dimension t11 is the right side between the valve body 14 and the valve holder part 15 when the valve body 14 is moved to the left end in the drawing in the radial direction D12 in the valve holder part 15. , that is, the difference between the inner diameter of the valve holder portion 15 and the outer diameter of the valve body 14 . The groove depth DP21 is preferably larger than 0.2 mm and smaller than 3 mm, particularly larger than 0.2 mm and smaller than 1 mm. Further, the depth dimension DP21 is greater than 1/4 of the width dimension W21 and less than 4 times the width dimension W21, particularly greater than 1/4 of the width dimension W21 and less than 1 time of the width dimension W21. The preferred point is the same as the first embodiment, and the effect is also the same.

According to the check valve 2 of the second embodiment described above, it goes without saying that the valve leakage performance when the valve is closed can be improved in the same manner as in the above-described first embodiment. In the check valve 2 of the second embodiment described above, the width dimension W21 is larger than the clearance dimension t11, so that the seating surface reliably overlaps the upper portion of the groove of the oil reservoir 29, so that oil does not flow between the seating surfaces. It is easy to supply, and the accuracy of oil supply can be further improved.

Here, in this embodiment, the groove as the oil reservoir portion 29 in the internal corner portion 131 is recessed from the valve seat side seating surface 161 in the axial direction D11. According to this configuration, machining of the groove in the axial direction D11 of the cylindrical valve holder portion 15 is facilitated in terms of tool accessibility and the like, so that the machining cost can be reduced.

Next, a plurality of modified examples of the first and second embodiments described so far will be described. Each of these modified examples differs from the first and second embodiments described above in terms of the oil reservoir. First, a first modified example will be described with reference to FIG.

FIG. 5 is a cross-sectional view showing a cross-section along the axial direction of a valve main body and a valve body, which are essential parts of a check valve according to a first modified example. In FIG. 5, the same reference numerals as those in FIGS. 1 and 2 are given to the same constituent elements as the constituent elements of the first embodiment shown in FIGS. are shown. Also, hereinafter, redundant description of these components will be omitted.

The first modification shown in FIG. 5 is a modification of the second embodiment described with reference to FIGS. In the check valve 3 of the first modified example, the groove as the oil reservoir portion 39 extends in the valve seat side seating surface 161 from the inner corner 131 between the valve seat side seating surface 161 and the valve holder portion 15 in the radial direction D12. It is provided in an annular shape at a position slightly spaced inside. In addition, this groove is a groove that is recessed in the axial direction D11 from the valve seat side seating surface 161, as in the second embodiment.

Next, a second modified example will be described with reference to FIG.

FIG. 6 is a cross-sectional view showing a cross-section along the axial direction of a valve main body and a valve body, which are essential parts of a check valve according to a second modification. In FIG. 6 as well, the same reference numerals as those in FIGS. 1 and 2 are attached only to the constituent elements that are referred to in the description for constituent elements that are equivalent to the constituent elements of the first embodiment shown in FIGS. are shown. Also, hereinafter, redundant description of these components will be omitted.

The second modification shown in FIG. 6 is a modification of both the first and second embodiments. In the check valve 4 of the second modified example, a groove as the oil reservoir portion 49 is provided on the valve body side seating surface 141 of the valve body 14 . Also, this groove is provided in an annular shape at a position slightly spaced inward in the radial direction D12 from the outer peripheral edge of the valve body side seating surface 141 corresponding to the internal corner portion 131 of the valve seat portion 16 . This groove is recessed in the axial direction D11 from the valve body side seating surface 141 in the direction opposite to that of the second embodiment.

Next, a third modified example will be described with reference to FIG.

FIG. 7 is a cross-sectional view showing a cross-section along the axial direction of the valve body, which is the main part of the check valve according to the third modification. In addition, in FIG. 7, illustration of other constituent elements other than the main part of this modified example is omitted. Further, since the valve body itself is the same as the valve body 14 in the first and second embodiments, the valve body is denoted by reference numeral "14" in FIG. 7 as well.

The third modification shown in FIG. 7 is an example obtained by further modifying the second modification shown in FIG. In the check valve 5 of the third modified example, a groove as the oil reservoir portion 59 is formed in the valve body side seating surface 141 of the valve body 14 so as to be recessed in the axial direction D11. It is provided in a double annular shape at a position slightly spaced inside in the radial direction D12 from the outer peripheral edge of 141 .

Next, a fourth modified example will be described with reference to FIG.

FIG. 8 is a cross-sectional view showing a cross-section along the axial direction of a portion around an oil reservoir, which is a main part of a check valve according to a fourth modification. It should be noted that FIG. 8 omits illustration of components other than the essential parts of this modified example.

A fourth modification shown in FIG. 8 is a modification of the first embodiment described with reference to FIGS. First, in the check valve 6 of the fourth modified example, the primary side of the valve body 64 is formed in a tapered shape with a flat surface remaining on the central side. The valve seat portion 66 of the valve body 63 has a mortar-shaped tapered surface that reaches the valve port 67 on the central side so as to face the tapered surface on the outer peripheral side that forms the tapered shape on the primary side of the valve body 64. It is formed at the boundary between the valve seat portion 66 and the valve holder portion 65 . In the fourth modification, the tapered surface on the primary side of the valve body 64 is the valve body side seating surface 641 , and the tapered surface of the valve seat portion 66 facing this is the valve seat side seating surface 661 . In the check valve 6 of the fourth modified example, the valve body 64 is moved in the axial direction D61 so that the tapered valve body side seating surface 641 contacts the tapered valve seat side seating surface 661 to move the valve. Sit on the seat 66 .

In this modified example, the oil reservoir portion 69 is configured by an annular groove that is recessed outward in the radial direction D62 from the tapered valve seat side seating surface 661 . The oil reservoir portion 69 may be an annular groove that is recessed from the valve seat side seating surface 661 in the axial direction D61.

Any of the first to fourth modifications described above with reference to FIGS. 5 to 8 can improve the valve leakage performance when the valve is closed, as in the first and second embodiments described above. It goes without saying that we can.

Next, a refrigeration cycle system to which the check valves 1 and 2 of the first and second embodiments described above and the check valves 3, 4, 5, and 6 of the first to fourth modifications described above are commonly applied will be explained.

FIG. 9 is a diagram showing a refrigeration cycle system according to one embodiment to which various check valves shown in FIGS. 1 to 8 are commonly applied. Note that FIG. 9 schematically shows the check valve as a check valve 110 in which distinctions between the first and second embodiments and the above-described first to fourth modifications are omitted.

A refrigeration cycle system 100 shown in FIG. 9 is used, for example, in air conditioners such as commercial air conditioners. This refrigeration cycle system 100 includes an indoor heat exchanger 101, an outdoor heat exchanger 102, an expansion valve 103, a four-way valve 104, and three compressors 105 connected in parallel, which are connected by pipes. . In order to prevent reverse flow of refrigerant to each compressor 105, the check valve 110 is provided between the discharge (high pressure output) side of each compressor 105 and the four-way valve 104, with the compressor 105 on the primary side and the four-way valve 104 on the primary side. Connected as secondary side.

During cooling operation, as indicated by a solid arrow D101, the refrigerant that has absorbed heat in the indoor-side heat exchanger 101 flows through the four-way valve 104 to the compressor 105 and is compressed by the compressor 105. , the check valve 110 and the four-way valve 104 to reach the outdoor heat exchanger 102 . After releasing the heat in the outdoor heat exchanger 102 , the heat returns to the indoor heat exchanger 101 via the expansion valve 103 . During heating operation, the refrigerant that has released heat in the indoor heat exchanger 101 reaches the outdoor heat exchanger 102 via the expansion valve 103, as indicated by the dotted arrow D102. After absorbing heat in the outdoor heat exchanger 102, the heat flows through the four-way valve 104 to the compressor 105, is compressed by the compressor 105, and passes through the check valve 110 and the four-way valve 104 to the indoor side. Return to heat exchanger 101 . The refrigerating cycle system 100 repeats these cycles to cool or heat the room.

Here, for example, when the cooling load is large, the three compressors 105 are operated simultaneously, so the three check valves 110 are fully opened. Also, under the condition that the cooling load is small, it is sufficient to operate only one compressor 105, so the other two compressors 105 are not operated. At this time, the secondary side pressure of the two check valves 110 becomes higher than the primary side pressure, causing backflow from the secondary side, and the two check valves 110 are closed.

According to the refrigeration cycle system 100 of the embodiment described above, since the check valve 110 described in the first and second embodiments and the first to fourth modifications is adopted, the check valve 110 Since the valve leakage performance when the valve is closed can be improved, there is no deterioration in energy saving performance and refrigeration efficiency due to system energy loss.

Note that the first and second embodiments and the first to fourth modifications described above merely show typical forms of the present invention, and the present invention is not limited to these. That is, various modifications can be made without departing from the gist of the present invention. Even with such modifications, as long as they still have the configurations of the check valve and the refrigeration cycle system of the present invention, they are, of course, included in the scope of the present invention.

For example, in the first and second embodiments and the first to fourth modifications described above, the check valves 1, . The stop valve is not limited to this. The check valve is not limited to commercial air conditioners, and may be used in home air conditioners, and is not limited to air conditioners, and can be applied to various freezers, refrigerators, and the like. Further, in the various refrigerating cycle systems described above, the check valve is not limited to being mounted on the discharge side of the compressor as in the example of mounting the check valve in the refrigerating cycle system 100 of FIG. It can be applied to prevent backflow in difficult places. In addition, there are a wide variety of refrigerants (for example, various Freon-based refrigerants, hydrocarbon-based refrigerants, natural refrigerants such as CO2 and ammonia, etc.) as refrigerants for each refrigeration cycle system. The check valve of the present invention can be applied to refrigeration cycle systems compatible with any of these refrigerants.

In addition, in the first and second embodiments and the first to fourth modifications described above, as an example of the oil reservoir portion, the oil reservoir portion is composed of single or double annular grooves each having an R-shaped bottom. The reservoirs 19, . . . , 69 are illustrated. However, the oil reservoir portion is not limited to these. For example, the number of grooves to be configured may be three or more, and the annular shape of the grooves may be an ellipse if the shape of the valve body and valve seat permit. Any shape such as a shape, an oval shape, a polygonal shape, or the like may be used. Also, the bottom shape of the groove is not limited to the R shape, and may be any shape such as a V shape or a rectangular shape.

Further, in the above-described first embodiment, as an example of the oil reservoir portion, oil is applied to the inner peripheral surface of the valve holder portion 15, which is a position communicating with the contact portion 18 between the valve seat side seating surface 161 and the valve body side seating surface 141. The provided oil reservoir portion 19 is illustrated. Further, in the second embodiment, the first and the fourth modified examples, the oil reservoir portions 29, 39, 69 provided on the valve seat side seating surfaces 161, 661 are exemplified. Further, in the second and third modifications, the oil reservoir portions 49 and 59 provided on the valve body side seating surface 141 are exemplified. However, the oil reservoir is not limited to these, and may be provided on both the valve seat side seating surface and the valve body side seating surface, or may be provided on both the valve body side seating surface and a position communicating with the contact portion of both seating surfaces. may be provided in

In the above-described first embodiment, as an example of the position where the oil reservoir is provided and communicates with the contact portion between the valve seat side seating surface and the valve body side seating surface, as shown in FIGS. The inner peripheral surface of the valve holder portion 15 at the internal corner portion 131 is illustrated. However, the position where the contact portion of the valve seat side seating surface and the valve body side seating surface communicate with each other is not limited to this, and may be, for example, another position as follows. First, in this example, the valve body side seating surface of the valve body is configured to come into contact with the valve body side seating surface at a position slightly spaced inward from the internal corner of the valve seat portion. In this case, in the valve seat portion, it is possible to provide a non-seating surface that extends flush with the radially outer side of the valve body side seating surface. This position communicates with the contact portion between the seating surface and the valve body side seating surface. Further, the oil reservoir portion may be configured by a groove that is recessed in the axial direction from such a non-seating surface of the valve seat portion.

Further, in the first and second embodiments and the first to fourth modifications described above, as an example of the oil reservoir portion, the diameter φ11 of the valve openings 17 and 67 (“11” is the identification code “φ11” as described above) , 69, which are formed by annular grooves having a diameter φ12 (as described above, "12" is a part of the identification code "φ12") larger than the diameter φ12 (a part of the It is However, the oil reservoir is not limited to this. , and its shape is not limited to a ring as described above. However, according to the oil reservoir portions 19, . The points that can be made are as described above.

Further, in the first and second embodiments and the first to fourth modifications described above, as an example of the valve body, the valve body 14 is formed in a cylindrical shape rising from the periphery of the valve seat side seating surfaces 161, 661 and the valve body 14 , 64 are illustrated with valve bodies 13, 63 having valve holder portions 15, 65 guiding them. However, the valve main body is not limited to this, and any specific aspect thereof does not matter as long as it has a valve seat portion and a valve opening. However, according to the valve bodies 13 and 63 having the valve holder portions 15 and 65, the opening and closing movement of the valve bodies 14 and 64 can be facilitated as described above.

Further, in the first and second embodiments described above, the oil reservoirs 19 and 29 formed of grooves formed in the internal corner 131 of the valve body 13 are exemplified as an example of the oil reservoir. However, the oil reservoir is not limited to this. The oil reservoir may be provided at a position away from the internal corner 131 as exemplified in the first to third modifications, or the valve It may be provided on the tapered seat side seating surface 661 provided on the main body 63 . However, as described above, valve leakage performance can be further improved by adopting the oil reservoirs 19 and 29 formed of grooves formed in the internal corners 131 .

Further, in the above-described first and second embodiments, as an example of the groove of the internal corner portion that constitutes the oil reservoir portion, a groove formed by being recessed outward in the radial direction D12 from the inner peripheral surface of the valve holder portion 15, , grooves recessed in the axial direction D11 from the valve seat side seating surface 161 are exemplified. However, the grooves of the internal corners forming the oil reservoir are not limited to these. For example, the groove of the internal corner may be obliquely recessed from the boundary between the valve holder and the seating surface on the valve seat side, and the specific form of the groove is not limited. However, the valve leakage performance can be further improved by the oil reservoir portion 19, which is formed by a groove that is recessed outward in the radial direction D12 from the inner peripheral surface of the valve holder portion 15, as described above. is. Also, as described above, the oil reservoir portion 29 formed by the groove recessed in the axial direction D11 from the valve seat side seating surface 161 can reduce the machining cost.

Further, in the above-described first and second embodiments, as an example of the width dimension of the groove at the internal corner, Dimensions greater than 0.1 mm and less than 2 mm are exemplified. However, the width dimension of the groove is not limited to this, and can be set to any dimension. However, as described above, by configuring the oil reservoirs 19 and 29 with the grooves of the above-described width dimension in the internal corner portion 131, it is possible to increase the accuracy of supplying oil between the seating surfaces. Further, by constructing the oil reservoirs 19 and 29 with grooves having the above-mentioned width dimensions, it is possible to more effectively avoid a decrease in the adhesion between the seating surfaces due to the valve body side seating surface riding on the R portion of the internal corner portion 131. It is also as described above.

Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and design modifications and the like are made within the scope of the present invention. is included in the present invention.

1, 2, 3, 4, 5, 6 check valve 12 outer tube portion 13, 63 valve body 14, 64 valve body 15, 65 valve holder portion 16, 66 valve seat portion 17, 67 valve port 18 contact portion 19, 29, 39, 49, 59, 69 Oil reservoir 100 Refrigeration cycle system 141, 641 Valve body side seating surface 161, 661 Valve seat side seating surface D11 Axial direction D12 Radial direction DP11, DP21 Depth dimension W11, W21 Width dimension t11 Gap Dimensions φ11 Diameter φ12, φ22 Diameter

Claims (8)

It comprises a tubular outer tube portion extending in the axial direction, a valve body assembled to the outer tube portion, and a valve body provided on the valve body, and allows fluid containing oil to pass through in a predetermined positive direction. A check valve that prevents backflow in the opposite direction,
The valve body has a valve seat on which the valve body can be seated, and a valve opening closed by the valve body seated on the valve seat,
The valve seat portion is provided with a valve seat side seating surface on which the valve body can be seated around the valve opening,
The valve body is provided with a valve body side seating surface that can be seated in surface contact with the valve seat side seating surface,
At least one of the valve seat side seating surface and the valve body side seating surface, or at least a position communicating with a contact portion where the valve seat side seating surface and the valve body side seating surface contact each other and the valve body side seating surface A check valve characterized in that an oil reservoir capable of storing said oil is provided on one side thereof. 2. The check valve according to claim 1, wherein the oil reservoir is formed of an annular groove having a diameter larger than that of the valve port. 3. The valve body according to claim 1, wherein the valve body has a cylindrical shape rising from the periphery of the valve seat side seating surface and has a valve holder portion that guides the valve element in the axial direction. Check valve. 4. The check valve according to claim 3, wherein the oil reservoir portion is formed by a groove formed in an internal corner portion between the valve seat side seating surface and the valve holder portion. 5. The check valve according to claim 4, wherein the groove of the internal corner portion is recessed in the axial direction from the seating surface on the valve seat side. 5. The check valve according to claim 4, wherein the groove of the internal corner portion is recessed radially outward from the inner peripheral surface of the valve holder portion. 7. The groove according to claim 5 or 6, wherein the width of the groove in the inner corner is larger than the gap between the valve body and the valve holder, and is larger than 0.1 mm and smaller than 2 mm. Non-return valve as described. A refrigeration cycle system comprising the check valve according to any one of claims 1 to 7.

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