Duplex strainer
By forming a blocking space and annular blocking space on the tube body of the double filter, the problem of low deformation and impurity removal efficiency of traditional filters during the tightening process is solved, and more stable sealing performance and higher production efficiency are achieved.
Patent Information
- Application Number
- JP2023179503
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-10-18
- Publication Date
- 2025-05-01
- Estimated Expiration
- 2043-10-18
AI Technical Summary
During the tightening process, traditional double filters can easily lead to microdeformation of the pipe body, affecting the sealing performance of the valve, and removing impurities on the filter screen requires a long period of running-in technology, and the productivity is very low.
A double filter is designed that forms a blocking space on the tube body to prevent deformation during tightening, and facilitates removal of incoming impurities through an annular blocking space design, improving the stability and cleanliness of the overall structure.
It effectively prevents micro-deformation of the pipe body during the tightening process, ensures stable rotation of the valve and good sealing performance, and simplifies the impurity removal process and improves production efficiency.
Smart Images
Figure 2025069658000001_ABST
Abstract
Description
[Technical field]
[0001] The present invention relates to a double strainer that is placed in the middle of the flow path of a liquid flowing from upstream to downstream inside a pipe and is used to remove foreign matter such as sludge and debris that has become mixed into the liquid. The double strainer is composed of left and right bodies fixed to the left and right sides of a cock case that houses a cock for switching the flow path, and a screen that houses therein for capturing the above-mentioned foreign matter. [Background technology]
[0002] In many chemical plants, industrial facilities, or structures, pipes (pipelines) have been installed as a flow path for liquid, and strainers have been installed midway through the pipes to remove foreign matter such as sludge contained in the liquid flowing from the upstream side. Such strainers include a screen that filters out foreign matter contained in the liquid.
[0003] However, when the strainer is used for a long time, a large amount of trapped foreign matter will adhere to the inner or outer surface of the screen. The adhesion of such foreign matter leads to a decrease or drop in the flow rate or flow velocity of the liquid flowing through the pipe per unit time (increasing pressure loss), so it becomes necessary to remove the foreign matter adhered to the screen periodically or as necessary. The removal of the foreign matter adhered to the screen can be performed by removing the screen and cleaning it, but this method requires temporarily stopping the flow of the liquid passing through the pipe and cannot be adopted. Therefore, a double strainer has been used so far as it has a structure that can remove the foreign matter without stopping the flow of the liquid. This double strainer is composed of a cock case connected to the middle of the pipe through which the liquid flows and containing a cock for switching the flow path inside, and left and right bodies fixed to the left and right of the cock case and containing screens for capturing the foreign matter inside, respectively. For example, the double strainer proposed by the applicant of the present application in JP-B-54-39633 (Patent Document 1) has a structure in which, by rotating a flow path switching cock arranged in the cock case, liquid flowing into the cock case from the upstream side flows either toward the left body or the right body, passes through a screen housed in the left or right body, and the liquid that has passed through either of these screens flows into the cock case and then flows downstream. For example, when the cock is in a state in which liquid flows into the left body, no liquid flows into the right body, and in this state, foreign matter adhering to the screen can be removed by, for example, removing the screen housed in the right body.
[0004] 11 shows a duplex strainer 100 which is an improvement of the duplex strainer disclosed in Patent Document 1, and includes a tap case 101 formed in a substantially block shape, a left body 102 whose right side is fixed to the left side of the tap case 101, and a right body 103 whose left side is fixed to the right side of the tap case 101. The tap case 101 includes a case main body 104 which accommodates the lower side of a shaft 106a of a tap 106 described later and in which a liquid storage space (reference number omitted) into which liquid from the upstream side flows is formed, and a case lid 105 which closes the liquid storage space formed in the case main body 104 at the top, and in the center of the case lid 105, a shaft insertion space (reference number omitted) is formed in which the shaft 106a is inserted from the bottom to the top. A rotating shaft 107 is fixed to the upper end of the shaft portion 106a, and a base end of an operating handle 108 for rotating the entire cock is detachably attached to the rotating shaft 107. The case body 104 is also formed with an inflow port 104a that allows liquid from an upstream pipeline (not shown) to flow into the liquid containing space, and a discharge port (not shown) that discharges liquid that has passed through either a left screen (not shown) or a right screen 115 (described later) into a downstream pipeline (not shown). In addition, the case main body 104 is formed with an upper left outlet passage 104b through which the liquid flowing in from the inflow port 104a flows toward the left body 102, a lower left inflow passage 104c through which the liquid filtered by a left screen (not shown) housed in the left body 102 flows (returns) into the case main body 104, an upper right outlet passage 104d through which the liquid flowing in from the inflow port 104a flows toward the right body 103, and a lower right inflow passage 104e through which the liquid filtered by a right screen 115 housed in the right body 103 flows (returns) into the case main body 104. The upper left outlet passage 104b and the upper right outlet passage 104d, as well as the lower left inflow passage 104c and the lower right inflow passage 104e, are formed at positions 180 degrees apart from each other around the central axis of the case main body 104. Inside the case body 104, a cock (flow path switching valve) 106 is disposed, which has a shaft portion 106a at the top and is rotatable by rotating the operation handle 108.This cock 106 is equipped with a shaft portion 106a inserted into a shaft insertion space formed in the center of the case cover body 105, a liquid inlet chamber 106b formed below the shaft portion 106a and located within a liquid storage space formed in the case body 104, the interior of which is constantly connected to the inlet port 104a, a liquid discharge chamber 106c into which liquid filtered by either the left screen or the right screen 115 (not shown) flows and which is connected to a liquid discharge path that is constantly connected to a discharge port (not shown), and a partition plate portion 106d separating the liquid inlet chamber 106b and the liquid discharge chamber 106c. In addition, the cock 106 has an upper opening 106e formed above the partition plate portion 106d, which connects the liquid inflow chamber 106b to either the upper left outflow passage 104b or the upper right outflow passage 104d, and a lower opening 106f formed in the cock 106, which connects the liquid discharge chamber 106c to either the lower left inflow passage 104c or the lower right inflow passage 104e. In addition, a bottom opening 106g is formed in the bottom surface of the cock 106, which connects the filtered liquid that has flowed into the liquid discharge chamber 106c to the liquid discharge passage (not shown). Incidentally, Figure 11 shows a state in which the liquid inflow chamber 106b is connected to the upper right outlet passage 104d formed in the case body 104 via the upper opening 106e, and the liquid discharge chamber 106c is connected to the lower right inflow passage 104e formed in the case body 104 via the lower opening 106f. Therefore, when the cock 106 is in the state shown in Figure 11, liquid that flows into the liquid inlet chamber 106b from the upstream side via the inlet port 104a passes through the upper opening 106e and the upper right outlet passage 104e and flows into the right side body 103 (right body main body 116 described later), and the liquid that flows into the right side body 103 passes through the right screen 115, then passes through the lower right inlet passage 104e and the lower opening 106f, passes through the liquid discharge chamber 106c, and further passes through the bottom opening 106g to flow into the liquid discharge passage not shown, and then flows into the downstream pipeline from the discharge port not shown.
[0005] The left body 102 comprises a left body main body 112 which houses a left screen (not shown) therein and has an opening at the top, a left cover body 113 which closes the opening formed in the left body main body 112, and a left handle 114 which fastens the left body main body 112 and the left cover body 113, and the right body 103 comprises a right body main body 116 which houses a right screen 115 therein and has an opening formed at the top, a right cover body 117 which closes the opening formed in the right body main body 116, and a right handle 118 which fastens the right body main body 116 and the right cover body 117. A disk-shaped left fixed plate portion 120 is formed on the right side of the left body main body 112, and is joined and fixed to the left side surface of the block-shaped case main body 104. On the central side of this left fixed plate portion 120, there are formed an upper left inflow passage (not shown) which connects the upper left outflow passage 104b formed in the case main body 104 with the inside of the left body main body 112, and a lower left outflow passage (not shown) which connects the lower left inflow passage 104c formed in the case main body 104 with the inside of the left body main body 112. Further, a disk-shaped right fixed plate 121 is formed on the left side of the right body main body 116, which is joined and fixed to the right side surface of the block-shaped case main body 104, and a right upper inlet passage (not shown) that communicates the right upper outlet passage 104d formed in the case main body 104 with the inside of the right body main body 116 and a right lower outlet passage (not shown) that communicates the right lower inlet passage 104c formed in the case main body 104 with the inside of the right body main body 116 are formed on the center side of the right fixed plate 121. Then, a bolt insertion hole (not shown) through which a plurality of stud bolts 130 are inserted is formed on the outer circumferential end side of the left fixed plate 120, while a plurality of bolt holes (not shown) through which the stud bolts 130 are screwed are formed on the left side surface of the case main body 104, and nuts 131 are screwed onto the stud bolts 130. Further, a bolt insertion hole, into which a stud bolt (not shown) similar to the stud bolt 130 is inserted, is formed on the outer circumferential end side of the right fixing plate portion 121, and a plurality of bolt holes (not shown) into which the plurality of stud bolts are screwed are formed on the right side surface of the case body 104, and nuts are screwed onto the stud bolts. [Prior art documents] [Patent documents]
[0006] [Patent Document 1] Special Publication No. 54-39633 Summary of the Invention [Problem to be solved by the invention]
[0007] 11, however, by rotating the nuts 131 threaded onto the stud bolts 130 to firmly fasten the stud bolts 130, the case body 104 is slightly distorted, and as a result, when the cock 106 is assembled into the case body 104, the sealing performance of the cock 106 is not ensured. In order to eliminate such distortion of the case body 104, a co-printing lapping method can be used in which the cock 106 and the case body 104 are rubbed together with an abrasive therebetween while the cock 106 is assembled into the case body 104, but this method requires long hours of work and is extremely poor in productivity.
[0008] Therefore, the present invention has been proposed to solve the problems associated with the conventional double strainers described above, and aims to provide a new double strainer that can effectively prevent distortion of the case body due to fastening with bolts, even when bolts are used to join and fasten the left body body and right body body to the case body that constitutes the cock case. [Means for solving the problem]
[0009] The present invention has been proposed to solve the above problems, and a first invention (the invention described in claim 1) is a valve case having a case main body in which a flow path switching valve is rotatably housed, a left side body fixed to the left side of the case main body and having a left body main body in which a left screen is housed, and a right side body fixed to the right side of the case main body and having a right body main body in which a right screen is housed, and the case main body has a left screen for directing liquid that has flowed into the case main body from the upstream side via an inflow port to the left body main body side. an upper outlet passage, a lower left inflow passage through which liquid filtered by the left screen from the left body main body side flows into the case main body; an upper right outlet passage through which liquid that has flowed into the case main body from the upstream side via the inflow port flows into the right body main body side; a lower right inflow passage through which liquid that has flowed into the case main body from the right body main body side flows into the case main body; and a discharge port through which liquid that has flowed into the case main body from either the lower left inflow passage or the lower right inflow passage flows downstream. An upper left inflow passage for flowing liquid into the main body, and a lower left outflow passage that is connected to the lower left inflow passage and flows liquid filtered by the left screen into the lower left inflow passage are formed in the right body main body, an upper right inflow passage that is connected to the upper right outflow passage and flows liquid from the upper right outflow passage into the right body main body, and a lower right outflow passage that is connected to the lower right inflow passage and flows liquid filtered by the right screen into the lower right inflow passage are formed in the right side of the left body main body, and the upper left outflow passage and the lower left inflow passage are formed inside, and a casing is provided at the middle of the outer circumferential side connecting the left side of the case main body and the left body main body. a left fixing plate portion having a plurality of left insertion holes through which a left fixing bolt for fixing the right side of the case main body is inserted, and on the left side of the right body main body, the upper right inflow passage and the lower right outflow passage are formed, and on the middle part of the outer periphery, a right fixing plate portion having a plurality of right insertion holes through which a right fixing bolt for fixing the right side of the case main body and the right body main body is inserted is formed, and on the left side of the case main body, the upper left outflow passage and the lower left inflow passage are formed, and a left fixing portion having a left joint surface to be joined to the right side surface of the left fixing plate portion is formed, and on the right side of the case main body,The right fixing plate portion has a right joint surface that is joined to the left side surface of the right fixing plate portion and has an upper right outlet passage and a right lower inlet passage formed therein, and a right fixing portion having a right joint surface that is joined to the left side surface of the right fixing plate portion, and a plurality of left bolt holes into which the left fixing bolt is inserted or screwed are formed in a middle portion of the outer periphery of the left fixing portion, and a plurality of right bolt holes into which the right fixing bolt is inserted or screwed are formed in a middle portion of the outer periphery of the right fixing portion, and a left side interruption space that interrupts the tightening force of each of the left fixing bolts is formed from all ends of the plurality of left bolt holes in the tightening direction of the left fixing bolt, and a right side interruption space that interrupts the tightening force of each of the right fixing bolts is formed from all ends of the plurality of right bolt holes in the tightening direction of the right fixing bolt.
[0010] In the double strainer according to the first invention, when liquid from the upstream side flows into the case body constituting the cock case through the inflow port, it flows from either the upper left outflow passage or the upper right outflow passage formed in the case body, and then flows into the left or right body body. The selection of the upper left outflow passage or the upper right outflow passage from which the liquid flowing into the case body from the upstream side flows is made by a cock for switching the flow passage housed in the case body. The liquid flowing into the left body body is filtered by the left screen housed in the left body body, passes through the lower left outflow passage, and further passes through the lower left inflow passage formed in the case body to flow into the case body, and the liquid flowing into the right body body is filtered by the right screen housed in the right body body, passes through the lower right outflow passage, and further passes through the lower right inflow passage formed in the case body to flow into the case body. Then, the liquid that has been filtered by either the left screen or the right screen and has flowed into the case body flows downstream via the discharge port.
[0011] In the first invention, a left fixing plate is formed on the right side of the left body main body, and a right fixing plate is formed on the left side of the right body main body. The left upper outlet passage and the left lower inlet passage are formed inside the left fixing plate, and a plurality of left insertion holes are formed in the middle part of the outer periphery through which the left fixing bolts for fixing the left side of the case main body and the left body main body are inserted, and the right fixing plate is formed on the right upper inlet passage and the right lower outlet passage are formed inside the right fixing plate, and a plurality of right insertion holes are formed in the middle part of the outer periphery through which the right fixing bolts for fixing the right side of the case main body and the right body main body are inserted. Meanwhile, a left fixing part is formed on the left side of the case main body, and a right fixing part is formed on the right side of the case main body. The left fixing portion has the upper left outlet passage and the lower left inlet passage formed therein, and has a left joint surface that is joined to the right side surface of the left fixing plate portion, and further has a plurality of left bolt holes formed in its outer circumferential midway portion, through which the left fixing bolt is inserted or screwed, and the right fixing portion has the upper right outlet passage and the lower right inlet passage formed therein, and has a right joint surface that is joined to the left side surface of the right fixing plate portion, and further has a plurality of right bolt holes formed in its outer circumferential midway portion, through which the right fixing bolt is inserted or screwed.
[0012] A left-side blocking space is formed in the direction in which the left fixing bolt is fastened from all ends of the plurality of left bolt holes, which blocks the fastening force of each of the left fixing bolts, and a right-side blocking space is formed in the direction in which the right fixing bolt is fastened from all ends of the plurality of right bolt holes, which blocks the fastening force of each of the right fixing bolts. Therefore, even if the left fixing bolts and right fixing bolts are fastened firmly, the fastening force is blocked by the left-side blocking space and the right-side blocking space, and there is no risk of the space formed within the case body being distorted even slightly, so that the flow path switching cock can be housed in a stably state and the cock can be rotated stably.
[0013] In the first invention, the outer shape of the left side surface of the left fixing part formed on the left side of the case body and the outer shape of the right side surface of the right fixing part formed on the right side of the case body may be a square shape with both upper and lower ends and both left and right ends formed in straight lines, or may be a circular shape. The left and right blocking spaces may be spaces that can block at least the fastening force of the left and right fixing bolts, and may be, for example, slits, recesses, or through holes formed in the fastening direction of the left and right fixing bolts, or may be formed in an annular shape so as to surround from the outside the portion in which the upper left outlet passage and the lower left inlet passage are formed and the portion in which the upper right outlet passage and the lower right inlet passage are formed (see the second invention).
[0014] The second invention (the invention described in claim 2) is characterized in that, in the above-mentioned first invention, the left side blocking space is formed in a circular ring shape so as to surround from the outside the left side pipe section in which the upper left outlet passage and the lower left inlet passage are formed, and the right side blocking space is formed in a circular ring shape so as to surround from the outside the right side pipe section in which the upper right outlet passage and the lower right inlet passage are formed.
[0015] In the double strainer of the second invention, the left and right blocking spaces are formed in an annular shape so as to surround the left and right pipe sections from the outside, and do not have slits, recesses or through holes. Therefore, even if sand, dust or other foreign matter enters or accumulates in the left and right blocking spaces, they can be easily cleaned and removed. It is also possible to reduce the load of the entire case body that constitutes the double strainer, thereby improving the workability when transporting the unit or when removing the entire unit from the liquid flow path for maintenance.
[0016] A third invention (the invention described in claim 3) is the second invention, wherein a left partition plate portion having a length in the liquid passage direction is formed in the left pipe section, the upper left outlet passage is formed above the left partition plate portion, and the lower left inlet passage is formed below the left partition plate portion, and a right partition plate portion having a length in the liquid passage direction is formed in the right pipe section, the upper right outlet passage is formed above the right partition plate portion, and the lower right inlet passage is formed below the right partition plate portion, and the upper left outlet passage, the lower left inlet passage, and the upper right outlet passage, and the lower right inlet passage are each formed in a substantially semicircular shape with an upper surface or a lower surface of the left partition plate portion or the right partition plate portion being flat, and the positions of the left bolt holes formed in the left fixed portion are equidistant from the center of the left pipe section, and the positions of the right bolt holes formed in the right fixed portion are equidistant from the center of the right pipe section.
[0017] In the duplex strainer according to the third invention, the left bolt holes formed in the left fixing part are equidistant from the center of the left duct section, and the right bolt holes formed in the right fixing part are equidistant from the center of the right duct section, so that the joining force or pressure contact force between the right side surface of the left fixing plate constituting the left body main body and the left joint surface formed on the left side of the case main body, and the joining force or pressure contact force between the left side surface of the right fixing plate constituting the right body main body and the right joint surface formed on the right side of the case main body, are uniform without variation depending on the positions of the fixing bolts. Therefore, the duplex strainer according to the third invention can effectively prevent the risk of the liquid before or after filtration leaking out from between the right side surface of the left fixing plate and the left joint surface, and between the left side surface of the right fixing plate and the right joint surface. Effect of the Invention
[0018] According to the present invention, even if bolts are used to join and fasten the left body main body and the right body main body to the case main body constituting the cock case, it is possible to effectively prevent distortion of the case main body due to fastening with the bolts. In particular, according to the second invention (invention described in claim 2), even if sand, dust, or other foreign matter enters or accumulates in the left and right blocking spaces, it can be easily cleaned and removed, and the load of the entire case main body constituting the double strainer can be reduced. Moreover, according to the third invention (invention described in claim 3), it is possible to effectively prevent the risk of liquid before or after filtration leaking to the outside from between the right side surface of the left fixing plate and the left joint surface, or between the left side surface of the right fixing plate and the right joint surface. [Brief description of the drawings]
[0019] [Figure 1] FIG. 1 is a plan view showing a dual strainer according to an embodiment of the present invention. [Diagram 2] 1 is a perspective view showing a dual strainer according to an embodiment of the present invention; [Diagram 3] FIG. 2 is a front view of the dual strainer shown in FIG. [Figure 4] FIG. 2 is a left side view of the dual strainer shown in FIG. [Diagram 5] FIG. 2 is a plan view of a cock case that constitutes the dual strainer shown in FIG. [Figure 6] FIG. 6 is a cross-sectional view of the duplex strainer shown in FIG. 5 taken along line AA. [Figure 7] 4 is a side view showing the left and right joint surfaces of the case body. FIG. [Figure 8] 4 is an end view showing the configuration of a left fixing portion and a right fixing portion that constitute a case main body. FIG. [Figure 9] FIG. 11 is a perspective view showing a schematic view of a main part of a second example of an interrupting space constituting the present invention. [Figure 10] FIG. 13 is a perspective view showing a schematic view of a main part of a third example of an interrupting space constituting the present invention. [Figure 11]FIG. 1 is a cross-sectional view showing a conventional duplex strainer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0020] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A dual strainer according to a preferred embodiment of the present invention will now be described.
[0021] As shown in Figs. 1 to 5, this double strainer includes a case body 2 constituting a faucet case, a left body body 3 with its right side fixed to the left side of the case body 2, a right body body 4 with its left side fixed to the right side of the case 2, and a faucet for switching flow paths (not shown). The case body 2 has an inflow space 2a (see Fig. 1) formed therein into which liquid flowing from the upstream side flows. The case body 2 includes a case lid (not shown) that closes the inflow space 2a from above as a component, and the case body 2 and the case lid form a faucet case. However, the case lid, the pivot shaft attached to the case lid, and the operating handle attached to the pivot shaft are the same as those of the conventional configuration shown in Fig. 11, so detailed explanations of them will be omitted. The left body body 3 has an opening 3a formed at the top and a storage space (reference numerals omitted) in which a left screen (not shown) is stored. A left cover (not shown) that closes the opening 3a is attached to the left body main body 3, and the left cover and the left body main body 3 constitute the left side body, but the left body main body 3, the left cover, and the left handle that fixes the left cover are basically configured in the same way as the left body main body 112, left cover 113, and left handle 114 shown in Fig. 11, so a description of them will be omitted. Similarly, the right body main body 4 has an opening 4a formed in the upper part, and an accommodation space (reference number omitted) in which a right screen (not shown) is accommodated. A right cover (not shown) that closes the opening 4a is attached to the right body main body 4, and the right cover and the right body main body 4 constitute the right side body, and the right body main body 4, the right cover, and the right handle that fastens the right cover are basically configured similarly to the right body main body 116, right cover 117, and right handle 118 that fastens the right body main body 116 and right cover 117 shown in Fig. 11, so a description of them will be omitted. Also, a right screen (not shown) housed in the right body main body 4 has a configuration similar to the right screen 115 shown in Fig. 11.
[0022] The case body 2 is formed with an upstream fixing plate part 21 which is joined and fixed to an upstream fixing plate part (not shown) formed at the tip of an upstream pipe (not shown) by four bolts and nuts 6 (not shown) (see FIG. 1 or FIG. 2), and the case body 2 is formed with a downstream fixing plate part 22 which is joined and fixed to a downstream fixing plate part (not shown) formed at the base end of a downstream pipe (not shown) by four bolts and nuts 7 (not shown) (see FIG. 1). The upstream fixing plate part 21 is formed at its center with an inflow port 21a communicating with the upstream pipe as shown in FIG. 6, and the liquid (liquid before being filtered) which has flowed in from the inflow port 21a is configured to flow into the inflow space 2a formed in the case body 2 through the inflow pipe 2b shown in FIG. 1 or FIG. 5. The upstream fixing plate part 21 is formed at an intermediate portion on the outer circumferential side with bolt insertion holes (not shown) through which the four bolts (not shown) are inserted, at equal intervals in the circumferential direction of the upstream fixing plate part 21. 2 or 3, an outlet port 2c communicating with a downstream pipe not shown is formed in the center of the downstream fixing plate portion 22, and the outlet port 2c and the case main body 2 are communicated with an outlet pipe 2d through which flows liquid (filtered liquid) that has flowed from the left body main body 3 or the right body main body 4 into the case main body 2. In addition, bolt insertion holes 2e through which the four bolts are inserted are formed at equal intervals in the circumferential direction of the downstream fixing plate portion 22 in the middle of the outer periphery of the downstream fixing plate portion 22.
[0023] 7, the case main body 2 is provided with an upper left outlet passage 2f through which the unfiltered liquid that has flowed into the inflow space 2a flows toward the left body main body 3, a lower left inflow passage 2g through which the liquid filtered by a left screen (not shown) housed in the left body main body 3 flows into (returns) the case main body 2, an upper right outlet passage 2h through which the unfiltered liquid that has flowed into the inflow space 2a flows toward the right body main body 4, and a lower left inflow passage 2i through which the liquid filtered by a right screen (not shown) housed in the right body main body 4 flows into (returns) the case main body 2. The upper left outlet passage 2f and the upper right outlet passage 2h, as well as the lower left inflow passage 2g and the lower right inflow passage 2i, are formed at positions 180 degrees symmetrical about the central axis of the case main body 2. In this embodiment, as shown in Fig. 7 or 8, the upper left outlet passage 2f and the lower left inlet passage 2g, and the upper right outlet passage 2h and the lower right inlet passage 2i are formed above and below each other with the left partition plate portion 2j or the right partition plate portion 2k formed between the upper left outlet passage 2f and the lower left inlet passage 2g, or between the upper right outlet passage 2h and the lower right inlet passage 2i, respectively. That is, as shown in Fig. 8, the upper left outlet passage 2f has a cross-sectional shape that is approximately semicircular with the upper surface of the left partition plate portion 2j as the lower surface, and the lower left inlet passage 2g is formed in a line symmetrical shape with the left partition plate portion 2j in between. Also, the upper right outlet passage 2h has a cross-sectional shape that is approximately semicircular with the upper surface of the right partition plate portion 2k as the lower surface, and the lower right inlet passage 2i is formed in a line symmetrical shape with the right partition plate portion 2k in between.
[0024] In addition, a cock (flow path switching valve) (not shown) having the same configuration as the cock 106 shown in Fig. 11 is rotatably arranged in the case body 2, and a partition plate portion 106d that partitions the liquid inflow chamber 106b and the liquid discharge chamber 106c described above and is formed in the cock 106 is located between the left partition plate portion 2j and the right partition plate portion 2k shown in Fig. 7. Therefore, in the double strainer according to this embodiment, the unfiltered liquid that flows into the case body 2 from the upstream pipe (not shown) through the inflow pipe 2b flows into the liquid inflow chamber 106b partitioned by the partition plate portion 106d, and does not flow into the liquid discharge chamber 106c formed below the partition plate portion 106d, but flows from the liquid inflow chamber 106b in either the direction of the upper left outflow path 2f or the direction of the upper right outflow path 2h. The liquid filtered by either the left screen housed in the left body main body 3 or the right screen housed in the right body main body 4 flows into the liquid discharge chamber 106c from either the left lower inflow passage 2g or the right lower inflow passage 2i without mixing with the unfiltered liquid in the liquid inflow chamber 106b. In addition, on the lower side of the case main body 2, as shown in Fig. 6, a discharge flow passage 2l is formed into which the liquid flowing out from the bottom side opening 106g shown in Fig. 11 formed at the bottom of the cock 106 flows and which is connected to the discharge pipe 2d. Therefore, the liquid flowing into the liquid discharge chamber 106c passes through the discharge flow passage 2l and reaches the discharge pipe 2d, and then flows from the discharge port 2c into a pipe on the downstream side (not shown).
[0025] The left side of the case main body 2 is provided with a left fixing part 23 (see FIG. 7) having the left upper outlet passage 2f and the left lower inflow passage 2g formed therein and a left joint surface 23a joined to the right side surface of the left fixing plate part 31 formed on the right side of the left body main body 3 shown in FIG. 1. The right side of the case main body 2 is provided with a right fixing part 24 (see FIG. 7) having the right upper outlet passage 2h and the right lower inflow passage 2j formed therein and a right joint surface 24a joined to the left side surface of the right fixing plate part 32 formed on the left side of the right body main body 4 shown in FIG. 1. Six left insertion holes 23b are formed in the middle of the outer periphery of the left fixing part 23, through which six left fixing bolts 8 are inserted to fix the left fixing plate part 31 formed on the left body 3 and the left fixing part 23 (see FIG. 8). In addition, six right insertion holes 24b are formed in the middle of the outer periphery of the right fixing part 24, through which six right fixing bolts 9 for fixing the right fixing plate part 32 formed in the right body main body 4 and the right fixing part 24 are inserted (see FIG. 8). Then, from all ends of the six left insertion holes 23b in the fastening direction of the left fixing bolt 8, a left blocking space 2m for blocking the fastening force of each of the left fixing bolts 8 is formed, as shown in FIG. 7, and from all ends of the six right insertion holes 23b in the fastening direction of the right fixing bolt 9, a right blocking space 2n for blocking the fastening force of each of the right fixing bolts 9 is formed. Then, the left blocking space 2m is formed in an annular shape so as to surround the outer periphery of the left pipe section 2p in which the left upper outflow passage 2f and the left lower inflow passage 2g are formed. The right-side blocking space 2n is formed in an annular shape so as to surround the outer periphery of the right-side pipe section 2q in which the upper right outlet passage 2h and the lower right inlet passage 2i are formed. Furthermore, the six left insertion holes 23b through which the six left fixing bolts 8 are inserted and the right insertion holes 24b through which the six right fixing bolts 9 are inserted are formed at equal distances from the center of the left-side pipe section 2p or the right-side pipe section 2q, respectively.
[0026] 1, a left fixing nut 10 is screwed onto the shaft portions (not shown) of the six left fixing bolts 8 whose tip sides of shaft portions (not shown) are inserted into the six left insertion holes 23b and exposed to the left side shielding space 2m, and a right fixing nut 11 is screwed onto the shaft portions (not shown) of the six right fixing bolts 9 whose tip sides of shaft portions (not shown) are inserted into the six right insertion holes 23b and exposed to the right side shielding space 2n. Note that left bolt insertion holes (not shown) through which the shaft portions of the six left fixing bolts 8 are inserted are formed in the middle of the outer periphery of the left fixing plate portion 31, and the heads (reference numerals omitted) of the left fixing bolts 8 are pressed against the left side surface of the left fixing plate portion 31 by fastening the left fixing nuts 10 to the shaft portions. Further, right bolt insertion holes (not shown) are formed in the middle of the outer periphery of the right fixing plate portion 32, through which the shanks of the six right fixing bolts 9 are inserted, and the heads (numbers omitted) of the right fixing bolts 9 are pressed against the right side surface of the right fixing plate portion 32 when the right fixing nut 11 is fastened to the shank.
[0027] Therefore, according to the double strainer of this embodiment, when each of the six left fixing bolts 8 is screwed and advanced into the left fixing nut 10, and the right side surface of the left fixing plate portion 31 constituting the left body main body 3 is joined to the left joint surface 23a of the left fixing portion 23 formed on the case main body 2, the fastening force between the left fixing bolt 8 and the left fixing nut 10 does not act on the case main body 2, and when each of the six right fixing bolts 9 is screwed and advanced into the right fixing nut 11, and the left side surface of the right fixing plate portion 32 constituting the right body main body 4 is joined to the right joint surface 24a of the right fixing portion 24 formed on the case main body 2, the fastening force between the right fixing bolt 9 and the right fixing nut 11 does not act on the case main body 2. As a result, the case main body 2 is slightly distorted, and the previously described cock 105 (flow path switching valve) can be stably accommodated in the case main body 2, and the cock can be stably rotated. In particular, in the duplex strainer according to this embodiment, the left shielding space 2m and the right shielding space 2n are formed in an annular shape so as to surround the outer periphery of the left duct section 2p or the right duct section 2q, so that even if sand, dust or other foreign matter enters or accumulates in the left shielding space 2m and the right shielding space 2n, the foreign matter can be easily cleaned and removed, and the load of the entire case body 2 constituting the duplex strainer can be reduced. Furthermore, in the duplex strainer according to this embodiment, the six left insertion holes 23b through which the six left fixing bolts 8 are inserted and the right insertion holes 24b through which the six right fixing bolts 9 are inserted are formed at equal distances from the center of the left duct section 2p or the right duct section 2q2p, so that the risk of the liquid before or after filtration leaking out from between the right side surface of the left fixing plate section 31 and the left joint surface 23a or between the left side surface of the right fixing plate section 22 and the right joint surface 24a can be effectively prevented.
[0028] In the above embodiment of the compound strainer, the left fixing part 23 formed on the left side of the case body 2 and the right fixing part 24 formed on the right side of the case body 2 have a disk-like outer shape in side view (see FIG. 1 or FIG. 2), but the left fixing part 23 and the right fixing part 24 may have a rectangular outer shape in side view, and the left blocking space 2m and the right blocking space 2n may be spaces that can block at least the fastening force of the left fixing bolt 8 or the right fixing bolt 9. For example, FIG. 9 is a schematic diagram showing a main part of the left side of the case body 42 described below. In the case body 42 shown in FIG. 9(a), left blocking parts 42b, 42c, 42d, and 42e formed in slits are formed on the upper surface, front surface, lower surface, and back surface to the right of the left joint surface 42a formed on the left side of the case body 42. The left joint surface 42a is a portion to be joined to the right side surface of the left fixing plate portion 31 formed on the right side of the left body main body 3 described above. The portion from these left blocking portions 42b, 42c, 42d, 42e to the left joint surface 42a is the left fixing portion 42f constituting the present invention. The left fixing portion 42f is formed with eight bolt holes 42g having threads (reference numbers omitted) on the inner periphery into which eight fixing bolts (stud bolts) (not shown) are screwed to fasten the case main body 42 and the left fixing plate portion 31 constituting the left body main body 3. As shown in FIG. 9B, one of the left blocking portions 42b, 42c, 42d, 42e is located in the fastening direction of each of the bolt holes 42g. The right side of the case main body 42 also has the same configuration as the left side (the configuration is symmetrical).
[0029] Furthermore, the left and right shielding spaces constituting the present invention may be as shown in Fig. 10. Fig. 10 is a schematic diagram showing the main part of the left side of the case body 52, and a first left shielding space 52b and a second left shielding space 52c are formed on the right side of a left joint surface 52a formed on the left side of the case body 52, penetrating from the upper surface to the lower surface of the case body 52, and a third left shielding space 52d and a fourth left shielding space 52e are formed on the front surface to the rear surface of the case body 52. The first left shielding space 52b is formed on the rear surface of the case body 52, and the second left shielding space 52c is formed on the front surface of the case body 52, and the second left shielding space 52b and the second left shielding space 52c are parallel to each other. The third left shielding space 52d is formed on the upper surface side of the case main body 52, and the fourth left shielding space 52e is formed on the lower surface side of the case main body 52, and the third left shielding space 52d and the fourth left shielding space 52e are parallel to each other. In this example, the left fixing part 52f constituting the present invention is located to the left of the portion where the first to fourth left shielding spaces 52b, 52c, 52d, and 52e are formed. The left fixing part 52f is formed with eight bolt holes 52g having threads (reference numbers omitted) on the inner periphery into which eight fixing bolts (stud bolts) not shown for fastening the case main body 52 and the left fixing plate part 31 constituting the left body main body 3 are screwed. In the fastening direction of each of the bolt holes 52g, any of the left shielding parts 52b, 52c, 52d, and 52e is located, as shown in FIG. 10(b). The right side of the case body 52 has the same configuration as the left side (they are symmetrical).
[0030] Even in the case of case body 42 shown in FIG. 9 or case body 52 shown in FIG. 10, even when fixing bolts are used to join and fix the left body body and right body body to case bodies 42, 52, it is possible to effectively prevent distortion of case bodies 42, 52 due to fastening with the fixing bolts. [Explanation of symbols]
[0031] 2 Case body 2a Inflow space 2b Inflow pipe 2c Outlet port 2d outflow pipe 2f Upper left outflow channel 2g Lower left inflow channel 2h Upper right outflow channel 2i Lower right inflow channel 2j Left partition plate 2k Right partition plate 2m Left side cutoff space 2n Right side isolation space 2p Left pipe section 2q Right pipe section 3 Left body 4 Right body 8 Left fixing bolt 9 Right fixing bolt 21a Inlet port 23 Left fixed part 23a Left joint surface 23b Left insertion hole 24 Right fixed part 24a Right joint surface 24b Right insertion hole 31 Left fixing plate part 32 Right fixing plate part 42 Case body 42a Left joint surface 42b, 42c, 42d, 42e Left cutoff section 42f left joint 52 Case body 52a Left joint surface 52b First left intercept space 52c Second Left Intercept Space 52d Third Left Intercept Space 52e 4th Left Intercept Space 102 Left side body 103 Right side body 106 Cook 106b Liquid inlet chamber 106d Partition plate 106e Upper opening 106f lower opening 115 Right Screen
Claims
1. The device comprises a cock case having a case main body in which a cock for switching a flow path is rotatably housed, a left side body having a left body main body fixed to the left side of the case main body and having a left screen housed therein, and a right side body having a right body main body fixed to the right side of the case main body and having a right screen housed therein, The case body is formed with an upper left outlet passage for causing liquid that has flowed into the case body from the upstream side via the inflow port to flow toward the left body body, a lower left inflow passage for causing liquid filtered by the left screen from the left body body side to flow into the case body, an upper right outlet passage for causing liquid that has flowed into the case body from the upstream side via the inflow port to flow toward the right body body side, a lower right inflow passage for causing liquid filtered by the right screen from the right body body side to flow into the case body, and a discharge port for causing liquid that has flowed into the case body from either the lower left inflow passage or the lower right inflow passage to flow downstream, the left main body is formed with an upper left inlet passage communicating with the upper left outlet passage and allowing liquid from the upper left outlet passage to flow into the left main body, and a lower left outlet passage communicating with the lower left inlet passage and allowing liquid filtered by the left screen to flow into the lower left inlet passage, an upper right inlet passage communicating with the upper right outlet passage and allowing liquid from the upper right outlet passage to flow into the right body; and a lower right outlet passage communicating with the lower right inlet passage and allowing liquid filtered by the right screen to flow into the lower right inlet passage, The left upper outlet passage and the left lower inlet passage are formed inside the right side of the left body main body, and a left fixing plate portion is formed in a middle portion on the outer periphery side thereof with a plurality of left insertion holes through which left fixing bolts for fixing the left side of the case main body and the left body main body are inserted, The right body main body has a left side on which the upper right inflow passage and the lower right outflow passage are formed, and a right fixing plate portion is formed in a middle portion on the outer periphery side, the right fixing plate portion having a plurality of right insertion holes through which right fixing bolts for fixing the right side of the case main body and the right body main body are inserted, On the left side of the case body, the upper left outlet passage and the lower left inlet passage are formed therein, and a left fixed part having a left joint surface to be joined to the right side surface of the left fixed plate part is formed; on the right side of the case body, the upper right outlet passage and the lower right inlet passage are formed therein, and a right fixed part having a right joint surface to be joined to the left side surface of the right fixed plate part is formed; A plurality of left bolt holes into which the left fixing bolt is inserted or screwed are formed in an outer peripheral midway portion of the left fixing portion, and a plurality of right bolt holes into which the right fixing bolt is inserted or screwed are formed in an outer peripheral midway portion of the right fixing portion, a left side blocking space is formed in the tightening direction of the left fixing bolt from all ends of the plurality of left bolt holes, blocking the tightening force of each of the left fixing bolts, and a right side blocking space is formed in the tightening direction of the right fixing bolt from all ends of the plurality of right bolt holes, blocking the tightening force of each of the right fixing bolts.
2. 2. A duplex strainer as described in claim 1, characterized in that the left side blocking space is formed in a circular ring shape so as to surround from the outside the left side pipe section in which the upper left outlet passage and the lower left inlet passage are formed, and the right side blocking space is formed in a circular ring shape so as to surround from the outside the right side pipe section in which the upper right outlet passage and the lower right inlet passage are formed.
3. a left partition plate portion having a length in a direction in which the liquid passes is formed in the left duct portion, the upper left outlet passage is formed above the left partition plate portion, and the lower left inlet passage is formed below the left partition plate portion; a right partition plate portion having a length in a direction in which the liquid passes is formed in the right pipe portion, the right upper outlet passage is formed above the right partition plate portion, and the right lower inlet passage is formed below the right partition plate portion; The cross-sectional shapes of the upper left outlet passage, the lower left inlet passage, the upper right outlet passage, and the lower right inlet passage are each formed into a substantially semicircular shape with the upper surface or the lower surface of the left partition plate portion or the right partition plate portion being flat, 3. The duplex strainer according to claim 2, wherein the positions of the left bolt holes formed in the left fixing portion are equidistant from the center of the left side pipe section, and the positions of the right bolt holes formed in the right fixing portion are equidistant from the center of the right side pipe section.
Citation Information
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