Ball valve device with built-in strainer

Abstract

To provide a ball valve device with a built-in strainer that can achieve both ease of attachment / detachment and retention of the strainer. [Solution] The strainer-integrated ball valve device 1 comprises a case 11 having an inlet 21a, an outlet 21b, and a valve chamber 21c connecting the inlet 21a and the outlet 21b; a ball valve body 12 rotatably disposed inside the valve chamber 21c and having a communication passage 12a connecting the inlet 21a and the outlet 21b, and an engaging portion 12b formed on the inner circumferential surface of the communication passage 12a; a strainer body 31 disposed in the communication passage 12a, and a strainer 13 having an operating portion 32c for operation in the rotational direction, an engaged portion 32b that engages with the engaging portion 12b by rotating in one direction, a ring portion 32a that holds the strainer body 31 in the communication passage 12a, and a retainer 32 having a diagonal flow portion 32d that converts the force of water flowing from the inlet 21a to the communication passage 12a into a rotational force in the aforementioned one direction.

Description

Technical Field

[0001] The present invention relates to a ball valve device with a built-in strainer.

Background Art

[0002] Conventionally, a ball valve device with a built-in strainer that incorporates a strainer and can filter impurities with the strainer during water flow has been known. As such a ball valve device with a built-in strainer, there are known techniques for fixing a strainer body to a ball valve body with an elastically deformable protrusion (see, for example, Patent Document 1) and techniques for fixing a strainer to a ball valve body with a retaining ring (see, for example, Patent Document 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] For a ball valve device with a built-in strainer, it is necessary to regularly attach and detach the strainer for cleaning work. For example, if the structure is such that the strainer can be easily removed, the retention of the strainer decreases, and there is a risk that the strainer will come off during use after the strainer is assembled. If the structure is such that the strainer is difficult to remove, the detachability including the workability of the strainer decreases. Therefore, it is required to achieve both the detachability of the strainer and the retention of the strainer.

[0005] Therefore, an object of the present invention is to provide a ball valve device with a built-in strainer in which both the detachability and the retention of the strainer can be achieved.

Means for Solving the Problems

[0006] According to one aspect of the present invention, a ball valve device with a built-in strainer comprises a case having an inlet, an outlet, and a valve chamber connecting the inlet and the outlet; a ball valve body rotatably disposed inside the valve chamber and having a communication passage connecting the inlet and the outlet, and an engaging portion formed on the inner circumferential surface of the communication passage; a strainer body disposed in the communication passage, and a strainer having an operating portion for operation in the rotational direction, an engaged portion that engages with the engaging portion by rotating in one direction, a ring portion for holding the strainer body in the communication passage, and a diagonal flow portion that converts the force of water flowing from the inlet to the communication passage into rotational force in the one direction. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a ball valve device with a built-in strainer that can achieve both ease of attachment / detachment and retention of the strainer. [Brief explanation of the drawing]

[0008] [Figure 1] A cross-sectional view showing the configuration of a ball valve device with a built-in strainer according to one embodiment of the present invention. [Figure 2] This is a side view showing a partial cross-section of the ball valve device with a built-in strainer, with the ball valve body in its first position. [Figure 3] This is a side view showing a partial cross-section of the ball valve device with a built-in strainer, with the ball valve body in the second position. [Figure 4] A perspective view showing the configuration of the ball valve body and strainer of the ball valve device with a built-in strainer. [Figure 5] A plan view showing the configuration of the retainer for the strainer. [Figure 6] A perspective view showing the configuration of the ball valve body and strainer of a ball valve device with a built-in strainer according to another embodiment. [Figure 7] A plan view showing the configuration of a retainer according to another embodiment. [Figure 8] A plan view showing the configuration of a retainer according to another embodiment. [Figure 9]A perspective view showing the configuration of the ball valve body and strainer of a ball valve device with a built-in strainer according to another embodiment. [Modes for carrying out the invention]

[0009] Hereinafter, the configuration of the strainer-integrated ball valve device 1 according to an embodiment of the present invention will be described with reference to Figures 1 to 5. Figure 1 is a cross-sectional view showing the configuration of the strainer-integrated ball valve device 1 according to one embodiment of the present invention in a horizontal cross-section. Figure 2 is a side view showing the configuration of the strainer-integrated ball valve device 1 in a partial cross-section with the ball valve body 12 in a first position, and Figure 3 is a side view showing the configuration of the strainer-integrated ball valve device 1 in a partial cross-section with the ball valve body 12 in a second position. Note that in Figures 2 and 3, the configuration of the handle 14b of the switching lever 14 is omitted.

[0010] Figure 4 is a perspective view showing the configuration of the ball valve body 12 and strainer 13 of the ball valve device 1 with built-in strainer. Figure 5 is a plan view showing the configuration of the retainer 32 of the strainer 13.

[0011] As shown in Figures 1 to 3, the ball valve device 1 with a built-in strainer comprises a case 11, a ball valve body 12, a strainer 13, and a switching lever 14. The ball valve device 1 with a built-in strainer allows water to flow when the ball valve body 12 shown in Figure 2 is in a first position, and restricts the flow of water when the ball valve body 12 shown in Figure 3 is in a second position.

[0012] As shown in Figures 1 to 3, the case 11 houses the ball valve body 12 so that it can rotate inside in a first position in which water can pass through and in a second position in which water cannot pass through. Specifically, the case 11 comprises a cylindrical outer member 21, a cap 22 detachably provided in an opening 21d formed in a part of the outer member 21, and a pair of annular sealing members 23 that rotatably support the ball valve body 12.

[0013] The outer casing member 21 is formed in a cylindrical shape. The outer casing member 21 has an inlet 21a, an outlet 21b, and a valve chamber 21c formed between the inlet 21a and the outlet 21b, which connects the inlet 21a and the outlet 21b. In addition, the outer casing member 21 has an opening 21d that is continuous with a part of the valve chamber 21c.

[0014] The inlet 21a and outlet 21b are, for example, arranged side by side in the axial direction of the outer casing member 21, and are formed so that piping and the like can be connected to each. The valve chamber 21c is provided with sealing members 23 on both the inlet 21a side and the outlet 21b side, and the ball valve body 12 is held in place by the pair of sealing members 23. The inner diameter of the opening 21d is formed to be larger than, for example, the maximum diameter of the strainer 13, which will be described later. The opening 21d is the outlet for the strainer 13. Also, for example, the distance from the strainer 13 of the ball valve body 12 to the opening end of the inlet 21a of the outer casing member 21 in the first position is formed to be longer than the distance from the strainer 13 of the ball valve body 12 to the opening end of the opening 21d of the outer casing member 21 in the second position.

[0015] For example, the outer casing member 21 comprises a first member 21A and a second member 21B that can be disassembled and assembled in the axial direction, and is formed by assembling these members 21A and 21B together. For example, by disassembling the first member 21A and the second member 21B, the valve chamber 21c is opened, and the ball valve body 12 is formed to be inserted into the valve chamber 21c. The first member 21A and the second member 21B have, for example, female and male threads formed on them, and are assembled together by screwing these female and male threads together, and then disassembled. In addition, a packing 99 that provides a watertight seal is provided between the contact surfaces (flange surfaces) of the first member 21A and the second member 21B.

[0016] The cap 22 is detachably formed on the opening 21d of the outer member 21. The cap 22 closes the opening 21d during the use of the strainer - incorporated ball valve device 1, and is removed from the opening 21d during the replacement of the strainer 13 or the like to open the opening 21d. For example, the cap 22 has male threads formed thereon and is screwed with female threads formed on the inner peripheral surface of the opening 21d. For example, a packing 99 for watertightly sealing is provided between the outer member 21 and the cap 22.

[0017] A part of the outer peripheral surface of the ball valve body 12 is held by a pair of annular seal members 23. The ball valve body 12 is housed inside the valve chamber 21c and is rotatably held by the pair of seal members 23 by the operation of the switching lever 14. The outer peripheral surface of the ball valve body 12 is watertightly sealed with the inner surface of the valve chamber 21c by the pair of seal members 23. The ball valve body 12 has a communication passage 12a that communicates the inlet 21a and the outlet 21b, an engaging portion 12b formed on the inner peripheral surface of the communication passage 12a, and a stepped portion 12c formed inside the communication passage 12a.

[0018] The communication passage 12a is, for example, a flow path extending along one direction. As shown in FIGS. 1 and 2, when the ball valve body 12 is in the first posture, the communication passage 12a faces the inlet 21a and the outlet 21b and constitutes a flow path communicating with the inlet 21a and the outlet 21b.

[0019] Also, as shown in FIG. 3, when the ball valve body 12 is in the second posture, the communication passage 12a retreats from the inlet 21a and the outlet 21b and becomes fluid - discontinuous with the inlet 21a and the outlet 21b. When the ball valve body 12 is in the second posture, the inlet 21a and the outlet 21b face the outer peripheral surface of the ball valve body 12, and since the outer peripheral surface of the ball valve body 12 is held by the pair of seal members 23, the ball valve body 12 dams up the water flowing from the inlet 21a. As described above, the ball valve body 12 allows water to flow through in the first posture and stops the water flow in the second posture.

[0020] The engaging portion 12b is formed to engage with the strainer 13 and fix the strainer 13 in place. The engaging portion 12b is formed on the inner circumferential surface of the communication passage 12a. The engaging portion 12b is formed adjacent to the stepped portion 12c on the side of the stepped portion 12c of the inner circumferential surface of the communication passage 12a into which the strainer 13 is inserted (inlet 21a side). The engaging portion 12b is formed so that it engages with the strainer 13 when the strainer 13 rotates in one direction, and disengages from the strainer 13 when it rotates in the opposite direction. For example, the engaging portion 12b is a female screw.

[0021] The stepped portion 12c protrudes from the inner circumferential surface of the communication passage 12a. The stepped portion 12c is formed to be able to hold the strainer 13 inserted into the communication passage 12a. For example, the surface of the stepped portion 12c that faces the strainer 13 in the insertion direction of the strainer 13 extends in a direction perpendicular to the axial direction of the communication passage 12a.

[0022] The strainer 13 is provided on the ball valve body 12 and removes impurities contained in the water passing through the communication passage 12a of the ball valve body 12. The strainer 13 comprises a strainer body 31 and a retainer 32 that presses against and holds the strainer body 31. The strainer 13 may have the strainer body 31 and the retainer 32 formed integrally or as separate parts. In this embodiment, an example in which the strainer body 31 and the retainer 32 are formed as separate parts will be described.

[0023] The strainer body 31 is formed in a mesh or net-like manner, with a bottomed cylindrical shape. For example, the strainer body 31 has a flange portion 31a formed at its open end.

[0024] The retainer 32 holds the strainer body 31 in the communication passage 12a. The retainer 32 comprises a cylindrical ring portion 32a, an engaged portion 32b formed on the outer circumferential surface of the ring portion 32a, an operating portion 32c formed on a part of the retainer 32, and a diagonal flow portion 32d formed on a part of the retainer 32.

[0025] The ring portion 32a is formed in a cylindrical shape. The outer diameter of the ring portion 32a is less than or equal to the inner diameter of the communication passage 12a of the ball valve body 12, and is larger than the inner diameter of the stepped portion 12c. The inner diameter of the ring portion 32a is formed to be the same diameter as, or approximately the same diameter as, the inner diameter of the stepped portion 12c. When the engaged portion 32b engages with the engaging portion 12b, the ring portion 32a holds the flange portion 31a of the strainer body 31 together with the stepped portion 12c by pressing the flange portion 31a of the strainer body 31 against the stepped portion 12c.

[0026] The engaged portion 32b is designed to engage with the engaging portion 12b by rotating in one direction CW, and to release the engagement with the engaging portion 12b by rotating in the other direction CCW. For example, the engaged portion 32b is a male screw that can engage with the engaging portion 12b, which is a female screw.

[0027] The operating part 32c is formed so that the ring portion 32a can be operated in the rotational direction by the user's fingers or a tool. For example, the operating part 32c is a rod-shaped knob that is integrally formed on the inner circumferential surface of the ring portion 32a and extends radially. For example, one operating part 32c is integrally formed at two opposing locations on the inner circumferential surface of the ring portion 32a, passing through the center of the ring portion 32a. For example, the operating part 32c is formed with a rectangular cross-section. The shape of the operating part 32c can be set as appropriate, as long as the retainer 32 can be rotated.

[0028] The diagonal flow section 32d is an inclined surface that is inclined with respect to the axial direction of the ring section 32a, in other words, with respect to the flow direction of water flowing from the inlet 21a through the connecting passage 12a to the outlet 21b. The diagonal flow section 32d is formed in a shape and position that can convert the force in the direction of water flow into a unidirectional CW rotational force in which the engaging section 12b and the engaged section 32b engage. That is, the diagonal flow section 32d is positioned to face a unidirectional CW that is clockwise with respect to the axis of the retainer 32. In addition, the inclined surface of the diagonal flow section 32d faces the inlet 21a.

[0029] In the example shown in Figures 4 and 5 of this embodiment, when the retainer 32 is rotated in one direction CW clockwise, the engaging portion 12b and the engaged portion 32b engage. The diagonal flow portions 32d are formed at two locations on the primary side of the rotation direction along the CW direction of the operating portion 32c, closer to the ring portion 32a than the center of the operating portion 32c (center of the ring portion 32a). These two diagonal flow portions 32d are formed axially symmetric with respect to the central axis of the retainer 32. The force of water contacting the diagonal flow portions 32d is decomposed into circumferential (rotational) forces due to the inclination of the diagonal flow portions 32d, so the diagonal flow portions 32d generate a force that rotates the ring portion 32a in one direction CW due to the flow of water.

[0030] The retainer 32 has a flat section 32e that is parallel to the central axis of the retainer 32 and faces the other direction CCW, which is counterclockwise with respect to the central axis of the retainer 32, and is in the direction of the water flow from the inlet 21a through the connecting passage 12a to the outlet 21b. The flat section 32e is integrally formed on the back surface of the diagonal flow section 32d. The ends of the diagonal flow section 32d and the flat section 32e are close together on the inlet 21a side. The ends of the diagonal flow section 32d and the flat section are connected on the outlet 21b side by a rear surface section 32f that is parallel to the central axis of the retainer 32 in a direction perpendicular to it. This rear surface section 32f is greater than the distance between the ends of the diagonal flow section 32d and the flat section 32e on the inlet 21a side. The axial cross-sectional shape consisting of the diagonal flow section 32d, the flat section 32e and the rear surface section 32f is a right triangle with the flat section 32e and the rear surface section 32f being at right angles. Furthermore, the two flat sections 32e are formed axially symmetric with respect to the central axis of the retainer 32.

[0031] The switching lever 14 comprises a rotating shaft 14a fixed to the ball valve body 12 and a handle 14b for rotating the rotating shaft 14a. The rotating shaft 14a passes through the outer casing member 21 and is rotatably supported by the outer casing member 21. For example, the rotating shaft 14a is held in a watertight manner by a packing 99 in the outer casing member 21. One end of the rotating shaft 14a is fixed to the ball valve body 12, and the other end of the rotating shaft 14a is fixed to the handle 14b. The handle 14b is formed to allow the rotating shaft 14a to rotate between a first position and a second position of the ball valve body 12.

[0032] In the strainer-integrated ball valve device 1 configured in this way, when the ball valve body 12 is in the first position, water flows from the inlet 21a through the connecting passage 12a to the outlet 21b, as shown in the water flow F. At this time, if there is foreign matter in the water, the strainer body 31 catches and removes the foreign matter.

[0033] Furthermore, by rotating the switching lever 14 by approximately 90°, the ball valve body 12 rotates via the rotating shaft 14a, and the ball valve body 12 changes from the first position to the second position. As a result, the communication passage 12a of the ball valve body 12 is positioned perpendicular to the water flow F, and the outer surface of the ball valve body 12 comes into contact with the sealing member 23, sealing the outer surface of the ball valve body 12, thereby blocking water from flowing through the outer surface of the ball valve body 12. In this way, the strainer-integrated ball valve device 1 switches between water flow and shut-off by operating the switching lever 14 to switch the position of the ball valve body 12 between the first and second positions.

[0034] In this way, while controlling the flow of water and stopping the flow, foreign matter contained in the water is removed, and after a certain period of use, maintenance such as cleaning or replacing the strainer 13 is performed. Next, this maintenance will be explained.

[0035] First, the switching lever 14 is operated to change the ball valve body 12 from the first position to the second position, blocking the flow of water. Next, with the water stopped, the cap 22 is removed and the opening 21d of the outer casing member 21 is opened. When the opening 21d is opened with the water stopped, the communication passage 12a of the ball valve body 12 becomes visible from the opening 21d. Next, the operator's fingers or a tool are used to operate the operating part 32c of the retainer 32, rotating it in the direction that releases the engagement between the engaging part 12b and the engaged part 32b (counterclockwise). This releases the engagement between the engaging part 12b and the engaged part 32b. Next, the retainer 32 is removed from the communication passage 12a, and the strainer body 31 is pulled out from the ball valve body 12 to perform maintenance work, such as cleaning or replacing the strainer body 31.

[0036] When returning the strainer body 31 after maintenance, the reverse procedure described above is followed. First, the strainer body 31 is inserted into the communication passage 12a of the ball valve body 12, and the flange portion 31a of the strainer body 31 is brought into contact with the stepped portion 12c. Next, the retainer 32 is inserted into the communication passage 12a of the ball valve body 12, and the operating portion 32c is operated to rotate it in the direction (one direction CW) in which the engaging portion 12b and the engaged portion 32b engage. As a result, the engaged portion 32b engages with the engaging portion 12b, and the ring portion 32a presses the flange portion 31a toward the stepped portion 12c, so that the flange portion 31a is held between the ring portion 32a and the stepped portion 12c. Thus, the strainer body 31 is held by the retainer 32. After that, the ball valve device 1 with the built-in strainer becomes usable by closing the opening 21d with the cap 22. Then, by operating the switching lever 14 again to enable water flow, water flows through the ball valve device 1 with built-in strainer.

[0037] In the ball valve device 1 with a built-in strainer configured as described above, engaging parts 12b and engaged parts 32b that engage by rotation are provided on the ball valve body 12 and the strainer 13 in order to fix the strainer 13 to the ball valve body 12. As a result, the strainer 13 can be attached to and detached from the ball valve body 12 simply by rotating the operating part 32c of the retainer 32, making attachment and detachment work easy. The retainer 32 also has a diagonal flow part 32d that converts the force generated by the flow of water into a force in the rotational direction in which the engaging parts 12b and engaged parts 32b engage. As a result, while water is flowing, the retainer 32 is subjected to a force in one direction of engagement, preventing the retainer 32 from coming off the ball valve body 12. Furthermore, since the diagonal flow part 32d is an inclined surface that is inclined with respect to the direction of water flow, providing the diagonal flow part 32d on the operating part 32c reduces the resistance of water passing through the operating part 32c. Furthermore, since the flat portion 32e of the retainer 32 is parallel to the central axis of the retainer 32, when water flows in from the inlet 21a, it is not subjected to the force of water that would move the retainer 32 in the direction of disengaging, thus allowing water to flow smoothly from the inlet 21a to the outlet 21b.

[0038] Therefore, the ball valve device 1 with a built-in strainer makes it easy to attach and detach the strainer 13, and also makes it difficult for the strainer 13 to come off.

[0039] Furthermore, by providing an opening 21d in the outer casing member 21, and configuring the strainer 13 to be attached to and detached from the ball valve body 12 in the second position through this opening, the strainer 13 can be attached and detached while the ball valve device 1 with the built-in strainer is attached to the piping, etc. Therefore, the work of removing the ball valve device 1 with the built-in strainer from the piping is unnecessary, and the attachment and detachment of the strainer 13 can be easily performed. In addition, by making the distance from the strainer 13 fixed to the ball valve body 12 to the opening 21d of the outer casing member 21 shorter than the distance from the strainer 13 fixed to the ball valve body 12 to the inlet 21a of the outer casing member 21, the operation of the retainer 32 with fingers or tools can be performed more easily than from the inlet 21a.

[0040] As described above, the ball valve device 1 with a built-in strainer according to this embodiment allows for both the ease of attachment and detachment of the strainer 13 and its retention.

[0041] It should be noted that the present invention is not limited to the embodiments described above. For example, in the above example, the engaging portion 12b and the engaged portion 32b are described as having a screw structure in which female and male threads are screwed together, but the invention is not limited to this, and the engaging portion 12b and the engaged portion 32b may have other configurations as long as they engage by rotating in one direction CW and disengage by rotating in the other direction CCW. For example, as shown in the example in Figure 6, the engaging portion 12b and the engaged portion 32b may have a bayonet structure having a plurality of grooves formed on one of the engaging portion 12b and the engaged portion 32b that extend along the circumferential direction or extend inclined in the circumferential direction, and a plurality of claws formed on the other of the engaging portion 12b and the engaged portion 32b that move along the plurality of grooves and are positioned in the grooves. As a specific example, the engaging portion 12b has a plurality of circumferentially extending protrusions 12b1 arranged in the circumferential direction, spaced apart in the axial direction of the step portion 12c and the connecting passage 12a, and a groove is formed between these protrusions 12b1 and the step portion 12c. Furthermore, the engaged portion 32b has a plurality of claws 32b1 extending in the circumferential direction on the outer circumferential surface of the ring portion 32a. The claws 32b1 are positioned between each projection 12b1 and the stepped portion 12c, and their circumferential movement is restricted in one direction CW, thereby fixing the retainer 32 to the communication passage 12a. Thus, the engaged portion 12b and the engaged portion 32b may be in the form of a bayonet structure.

[0042] Furthermore, in the example described above, the strainer body 31 is a bottomed cylindrical shape with a flange portion 31a formed at the open end, but it is not limited to this configuration. For example, as shown in Figure 6, the strainer body 31 may have a handle portion 31b extending radially at the open end. In the case of such a configuration with a handle portion 31b, in order to prevent an increase in fluid resistance, it is preferable that when the strainer body 31 is held by the retainer 32, the handle portion 31b is covered by at least a part of the operating portion 32c or the diagonal flow portion 32d of the retainer 32, and that the handle portion 31b and the operating portion 32c or diagonal flow portion 32d overlap in the direction of water flow.

[0043] Furthermore, although the above-described example explains a configuration in which two diagonal flow sections 32d are provided on the operating section 32c, the configuration is not limited to this, and there may be one or more diagonal flow sections 32d, or they may be provided separately from the operating section 32c. For example, in the example shown in Figure 7, there is one diagonal flow section 32d provided integrally with the operating section 32c, and in the example shown in Figure 8, there is one diagonal flow section 32d provided separately from the operating section 32c. For example, in these configurations, the operating section 32c has a shape that extends from one point on the inner circumferential surface of the ring section 32a to the center of the ring section 32a. Also, in the example shown in Figure 8, a portion of the inner circumferential surface of the ring section 32a that protrudes inward from a position away from the operating section 32c is formed separately from the operating section 32c, and the diagonal flow section 32d is provided on this portion. Furthermore, the diagonal flow section 32d may be configured such that, for example, multiple sections are provided along the circumferential direction on the inner edge side of the end face of the ring section 32a on the inlet 21a side.

[0044] Furthermore, although the above example describes a configuration in which the strainer 13 is formed by separately forming the strainer body 31 and the retainer 32, it is not limited to this. For example, as shown in Figure 9, the strainer 13 may be formed by integrally forming the strainer body 31 and the retainer 32. In the case of such a strainer 13, the retainer 32 may be integrally formed without providing a flange portion 31a at the open end of the strainer body 31, or the retainer 32 may be integrally formed with the flange portion 31a at the open end of the strainer body 31. In such a strainer 13, when the engaged portion 32b of the retainer 32 is engaged with the engaged portion 12b of the ball valve body 12, the retainer 32 comes into contact with the stepped portion 12c, thereby holding and fixing the strainer 13 to the ball valve body 12.

[0045] Furthermore, in the example described above, the strainer body 31 is fixed to the ball valve body 12 by being held by the retainer 32 and the stepped portion 12c, but it is not limited to this. For example, the strainer body 31 may be configured to have a biasing member such as a leaf spring between the main surface on the stepped portion 12c side (back side) of the flange portion 31a and the stepped portion 12c, which biases the flange portion 31a and the stepped portion 12c to move apart. By providing such a biasing member, if the retainer 32 is not provided, the flange portion 31a will be biased so that it floats away from the stepped portion 12c, making it easier to remove the strainer body 31 after removing the retainer 32. Also, if the engaging portion 12b and the engaged portion 32b have a screw structure, the retainer 32 is pressed in a direction that brings the male and female threads closer together in the axial direction, thereby improving the engagement force of the male and female threads. Similarly, when the engaging portion 12b and the engaged portion 32b are bayonet structures, the multiple claws 32b1 of the engaged portion 32b are pressed toward the multiple projections 12b1 of the engaging portion 12b, thereby improving the engagement force. In this way, by providing the biasing member between the flange portion 31a and the stepped portion 12c, the retention of the strainer 13 by the ball valve body 12 can be improved.

[0046] Furthermore, although the above example describes a configuration in which the retainer 32 has a flat portion 32e, it is not limited to this, and may have a configuration without a flat portion 32e. That is, the retainer 32 may have a diagonal flow portion 32d and be capable of holding the strainer body 31. Also, although the above example describes a configuration in which the rear surface portion 32f of the retainer 32 is formed in a flat shape, it is not limited to this, and the rear surface portion 32f may have a recessed shape rather than being flat.

[0047] It should be noted that the present invention is not limited to the embodiments described above, and can be modified in various ways during implementation without departing from its essence. Furthermore, each embodiment may be combined as appropriate, and in that case, the combined effects can be obtained. Moreover, the above embodiments include various inventions, and various inventions can be extracted by selecting combinations from the multiple constituent elements disclosed. For example, if the problem can be solved and effects obtained even if some constituent elements are deleted from all the constituent elements shown in the embodiment, then the configuration with these deleted constituent elements can be extracted as an invention. [Explanation of symbols]

[0048] 1... Ball valve device with built-in strainer, 11... Case, 12... Ball valve body, 12a... Communication passage, 12b... Engaging part, 12b1... Projection, 12c... Stepped part, 13... Strainer, 14... Switching lever, 14a... Rotating shaft, 14b... Handle, 21... Outer casing member, 21A... First member, 21B... Second member, 21a... Inlet, 21b... Outlet, 21c... Valve chamber, 21d... Opening, 22... Cap, 23... Seal member, 31... Strainer body, 31a... Flange part, 31b... Knob part, 32... Presser, 32a... Ring part, 32b... Engaged part, 32b1... Claw, 32c... Operating part, 32d... Diagonal flow part.

Claims

1. A case having an inlet, an outlet, and a valve chamber connecting the inlet and the outlet, A ball valve body is rotatably disposed inside the valve chamber and has a communication passage connecting the inlet and the outlet, and an engaging portion formed on the inner circumferential surface of the communication passage. A strainer comprising a strainer body disposed in the communication passage, an operating part for operation in the rotational direction, an engaged part that engages with the engaging part by rotating in one direction, a ring part that holds the strainer body in the communication passage, and a retainer having a diagonal flow part that converts the force of water flowing from the inlet to the communication passage into rotational force in one direction, A ball valve device with a built-in strainer.

2. The strainer body and the retainer are formed as separate parts. The engagement portion is a female screw formed in the communication passage. The ball valve device with built-in strainer according to claim 1, wherein the engaged portion is a male screw formed on the outer circumferential surface of the retainer.

3. The strainer body and the retainer are formed as separate parts. The ball valve device with a built-in strainer according to claim 1, wherein the engaging portion and the engaged portion are formed in a bayonet structure having a groove formed on one of the engaging portion and the engaged portion that extends along the circumferential direction or extends inclined in the circumferential direction, and a claw formed on the other of the engaging portion and the engaged portion that moves along the groove.

4. A handle is formed at the opening of the strainer body. The ball valve device with a built-in strainer according to any one of claims 1 to 3, wherein the operating section or the diagonal flow section overlaps with the knob section in the direction of water flow.

5. The aforementioned connecting passage has a stepped portion formed therein to hold the strainer body. The strainer body comprises a flange facing the stepped portion, and a biasing portion provided between the flange and the stepped portion for biasing the flange and the stepped portion, as described in claim 1, for a ball valve device with a built-in strainer.

Images