Check valve and sanitary washing device comprising the same

Abstract

To provide a check valve having good sealability, and a sanitary washing device comprising the same.SOLUTION: A check valve 1 comprises a case 2, and a valve element 3. An inner cylinder 23 extends toward an upper part from an inner bottom surface 201 of the case 2. The upper part is provided with a vent hole 24, and a lower part is provided with a liquid inlet hole 25 and a liquid outlet hole 27. The liquid inlet hole 25 is made to communicate with the inside of the inner cylinder 23. The valve element 3 comprises a vertical cylinder 31, a lid 32, and a rubber body 33. The inner cylinder 23 is inserted into the vertical cylinder 31. In the case of a forward flow, the lid 32 separates from an upper end of the inner cylinder 23, and the rubber body 33 comes into contact with an annular contact portion 2021 of an inner upper surface 202. In the case of a backward flow, the lid 32 comes into contact with the upper end of the inner cylinder 23, and the rubber body 33 separates from the contact portion 2021.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a check valve and a sanitary washing device equipped with the same. [Background technology]

[0002] Patent Document 1 discloses a sanitary washing device with a backflow prevention function that prevents water from flowing back from the sanitary washing device into a water pipe. Patent Documents 2 and 3 disclose sanitary washing devices equipped with a backflow prevention valve. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-98621 A [Patent Document 2] JP 2012-202101 A [Patent Document 3] International Publication No. 2014 / 006791 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present disclosure is to provide a check valve having good sealing properties and a sanitary washing device equipped with the same. [Means for solving the problem]

[0005] A check valve according to one embodiment of the present disclosure includes a case and a valve body. The valve body is incorporated inside the case. Inside the case, an inner cylinder extends upward from the inner bottom surface of the case toward the upper part of the case. The case includes at least one air hole provided at the upper part of the case, a liquid inlet hole and a liquid outlet hole provided at the lower part of the case. The liquid inlet hole is connected to the inside of the inner cylinder. The valve body includes a vertical cylinder, a lid formed at the upper part of the vertical cylinder, and a rubber body attached to the lid. The lid is formed integrally with the vertical cylinder. The vertical cylinder is provided outside the inner cylinder so that the inner cylinder is inserted inside the vertical cylinder. The case includes an annular contact portion protruding downward from the inner upper surface facing the inner bottom surface toward the lower part of the case. In the case of a forward flow in which liquid flows from the liquid inlet hole to the liquid outlet hole, the lid is spaced from the upper end of the inner cylinder and the rubber body is in contact with the annular contact portion, and in the case of a reverse flow in which liquid is sucked toward the liquid inlet hole, the lid is in contact with the upper end of the inner cylinder and the rubber body is spaced from the contact portion.

[0006] A sanitary washing device according to one embodiment of the present disclosure includes the check valve. Effect of the Invention

[0007] The present disclosure provides a check valve with good sealing properties and a sanitary washing device equipped with the same. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 shows a cross-sectional view of a check valve according to one embodiment (in the case of forward flow) cut along a vertical plane. [Diagram 2] FIG. 2 shows a cross-sectional view of a check valve according to one embodiment (in the case of backflow) taken along a vertical plane. [Diagram 3]Fig. 3A shows a cross-sectional view of a lower case part of a check valve according to an embodiment when the lower case part is cut along a plane having a normal line in the vertical direction. Fig. 3B shows a partially enlarged view of a cross-section of a check valve according to an embodiment when the check valve is cut along a plane having a normal line in the vertical direction. [Figure 4] FIG. 4 is a schematic diagram of an upper case part of a check valve according to one embodiment, as viewed obliquely from below. [Diagram 5] Fig. 5A is a schematic diagram of a valve body of a check valve according to an embodiment, as viewed from above. Fig. 5B is a schematic diagram of a valve body of a check valve according to an embodiment, as viewed from the side. Fig. 5C is a schematic diagram of a valve body of a check valve according to an embodiment, as viewed from below. [Figure 6] FIG. 6 is a schematic horizontal cross-sectional view showing the relationship between the upper case internal space, the lower case internal space, and the rubber body (that is, an example of a valve body) of a check valve according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. A representative example of the term "liquid" used in this specification is water. Water includes not only cold water but also hot water. A representative example of the term "gas" used in this specification is air.

[0010] 1 and 2 show cross-sectional views of a check valve 1 according to one embodiment, which is cut along a vertical plane. As shown in FIG. 1, the check valve 1 according to this embodiment includes a case 2 and a valve body 3. The valve body 3 is incorporated inside the case 2. In other words, the valve body 3 is located in a space formed inside the case 2. Hereinafter, the "space formed inside the case 2" will be simply referred to as the "internal space 200."

[0011] (case) As shown in FIG. 1 and FIG. 2, the case 2 is preferably composed of an upper case portion 21 and a lower case portion 22. The upper case portion 21 has a cylindrical upper case tube portion 211 and a top plate portion 212 that closes the opening at the upper end of the upper case tube portion 211. The space surrounded by the upper case tube portion 211 and the top plate portion 212 becomes the upper case internal space 210 of the upper case portion 21. The lower case portion 22 has a cylindrical lower case tube portion 221 and a bottom plate portion 222 that closes the opening at the lower end of the lower case tube portion 221. The space surrounded by the lower case tube portion 221 and the bottom plate portion 222 becomes the lower case internal space 220 of the lower case portion 22. The upper case portion 21 constitutes the upper portion of the case 2. The lower case portion 22 constitutes the lower portion of the case 2.

[0012] The valve body 3 is sandwiched between the upper case part 21 and the lower case part 22. In other words, the internal space 200 (i.e., the upper case internal space 210 and the lower case internal space 220) is formed by the upper case part 21 and the lower case part 22. The valve body 3 is located in the internal space 200.

[0013] Preferably, the case 2 is tubular. The case 2 may have a polygonal prism shape. More preferably, the case 2 is cylindrical.

[0014] 1, the case 2 has an inner bottom surface 201, an inner top surface 202, an outer top surface 203, an outer bottom surface 204, and case side surfaces 205. The inner top surface 202 is composed of an end surface of an upper case cylindrical portion 211 facing downward and the lower surface of a top plate portion 212.

[0015] The check valve 1 is designed such that the up-down direction is specified, and the present disclosure will be described based on this specified up-down direction. Hereinafter, the term "upward direction" refers to the direction from the inner bottom surface 201 to the inner top surface 202. The term "downward direction" refers to the direction from the inner top surface 202 to the inner bottom surface 201.

[0016] FIG. 4 is a schematic diagram of the upper case part 21 of the check valve 1 according to one embodiment, seen from diagonally below. As shown in FIG. 1, FIG. 2, and FIG. 4, an annular contact part 2021 that protrudes downward from the inner upper surface 202 is formed on a part of the inner upper surface 202 of the case 2 (particularly, the end surface facing downward of the upper case cylindrical part 211). The annular contact part 2021 faces the lower case internal space 220 of the lower part of the case 2 (i.e., the lower case part 22). The upper case internal space 210 and the lower case internal space 220 communicate with each other via the inside of the annular contact part 2021. The annular contact part 2021 comes into contact with the valve body 3 during forward flow, which will be described later.

[0017] 1 and 2, inside the case 2, an inner cylinder 23 extends from the inner bottom surface 201 of the case 2 toward the upper part of the case 2 (i.e., toward the inner upper surface 202). The inner cylinder 23 may have a polygonal prism shape. Preferably, the inner cylinder 23 is cylindrical.

[0018] When the case 2 is composed of an upper case portion 21 and a lower case portion 22, the inner cylinder 23 is provided in the lower case portion 22. It is desirable that the liquid inlet hole 25 is a hole surrounded by an outer cylinder 26 that extends downward from the outer bottom surface 204 of the lower case portion 22.

[0019] Fig. 3A shows a cross-sectional view of the lower case part 22 according to this embodiment when cut along a plane having a normal line in the vertical direction. Fig. 3B shows a partially enlarged view of the cross-section of the check valve 1 according to this embodiment when cut along a plane having a normal line in the vertical direction.

[0020] 3A, it is preferable that a protrusion 232 protruding laterally is provided on the outer circumferential surface of the inner tube 23. The protrusion 232 protrudes laterally from the outer circumferential surface of the inner tube 23 toward the vertical tube 31 described later.

[0021] 1 and 2, the case 2 has at least one ventilation hole 24, a liquid inlet hole 25, and a liquid outlet hole 27. The at least one ventilation hole 24 may include two or more ventilation holes 24. In other words, the case 2 may include two or more ventilation holes 24.

[0022] (Ventilation hole 24) The ventilation hole 24 is provided in the upper part of the case 2. In other words, the ventilation hole 24 is a through hole that passes laterally through the upper case cylinder portion 211 of the case 2. As shown in Figs. 1 and 2, when the case 2 is composed of the upper case portion 21 and the lower case portion 22, the ventilation hole 24 is provided in the upper case portion 21. In this case, it is desirable that the liquid inlet hole 25 and the liquid outlet hole 27 are provided in the lower case portion 22.

[0023] (Liquid entry hole 25) The liquid inlet hole 25 communicates with the inside of the inner cylinder 23. In other words, the liquid inlet hole 25 is directly connected to the inside of the inner cylinder 23. The term "directly" means that no other physical element is interposed between the two physical elements (e.g., the inner cylinder 23 and the liquid inlet hole 25) that are connected to each other.

[0024] The liquid inlet hole 25 is a through hole provided in the lower part of the case 2. In other words, it is a through hole that penetrates between the inner bottom surface 201 and the outer bottom surface 204 of the case 2. As shown in Figures 1 and 2, when the case 2 is composed of an upper case part 21 and a lower case part 22, it is desirable that the liquid inlet hole 25 be provided in the lower case part 22.

[0025] Inside the case 2, it is desirable that the inner bottom surface 201 and the inner top surface 202 are parallel to and face each other.

[0026] (Liquid drain hole 27) The liquid outflow hole 27 is a through hole. It is desirable that the liquid outflow hole 27 is provided in the lower case tube portion 221 of the case 2 so as to penetrate the case side surface 205. When the case 2 is composed of the upper case portion 21 and the lower case portion 22, it is desirable that the liquid outflow hole 27 is provided in the lower case portion 22. Alternatively, when the case 2 is composed of the upper case portion 21 and the lower case portion 22, the upper half of the liquid outflow hole 27 may be formed in the upper case portion 21, and the lower half of the liquid outflow hole 27 may be formed in the lower case portion 22.

[0027] (Valve body 3) As shown in Fig. 1 and Fig. 2, the valve body 3 is incorporated inside the case 2. Fig. 5A shows a schematic diagram of the valve body 3 of the check valve 1 according to one embodiment, viewed from above. Fig. 5B shows a schematic diagram of the valve body 3 of the check valve 1 according to one embodiment, viewed from the side. Fig. 5C shows a schematic diagram of the valve body 3 of the check valve 1 according to one embodiment, viewed from below. As shown in Figs. 1 and 2, the valve body 3 includes a vertical cylinder 31, a lid 32, and a rubber body 33. The lid 32 is formed integrally with the vertical cylinder 31.

[0028] (vertical tube 31) The vertical tube 31 extends downward from the lid 32. In other words, the vertical tube 31 extends from the lid 32 toward the inner bottom surface 201. As shown in Figs. 1 and 2, the inner tube 23 is inserted inside the vertical tube 31. In other words, the vertical tube 31 is provided so as to surround the outside of the inner tube 23. As shown in Fig. 3B, a gap 34 is formed between the vertical tube 31 and the inner tube 23. The tip of the protrusion 232 may contact the inner surface 311 of the vertical tube 31.

[0029] (Lid 32) As shown in Figs. 1 and 2, the lid 32 is formed on the upper part of the vertical tube 31. The shape of the lid 32 is not particularly limited as long as the lid 32 closes the upper part of the vertical tube 31. Desirably, the lid 32 has a thin plate shape. The upper end of the vertical tube 31 is closed by the lid 32. On the other hand, the lower end of the vertical tube 31 is open. In other words, an opening is formed at the lower end of the vertical tube 31. The inner tube 23 is inserted into the interior of the vertical tube 31 through the opening.

[0030] (Rubber body 33) The rubber body 33 is deformable since it is made of rubber. Preferably, the rubber body 33 is made of a flexible rubber that is easily deformable.

[0031] The rubber body 33 has a plate shape. The rubber body 33 may have a polygonal plate shape. Preferably, the rubber body 33 has a disk shape. The lower surface of the rubber body 33 is fixed to the upper surface of the lid 32. Examples of the fixing method include bonding with an adhesive and fastening with screws.

[0032] A rubber tube 331 extends upward from the upper surface of the rubber body 33. A protrusion 2022 extends downward from the inner upper surface 202 of the upper part of the case 2. A part of the lower end of the protrusion 2022 is inserted inside the rubber tube 331.

[0033] (Operation of check valve 1) The operation of the check valve 1 according to this embodiment will be described below.

[0034] (Operation of check valve 1 during forward flow) As shown in Fig. 1, during forward flow, liquid flows from the liquid inlet hole 25 toward the liquid outlet hole 27. In Fig. 1, the flow of liquid during forward flow is indicated by arrow A1. First, liquid flows upward from the liquid inlet hole 25 into the inside of the inner tube 23. Desirably, the liquid flows continuously. In other words, liquid is supplied upward from the liquid inlet hole 25 into the inside of the inner tube 23.

[0035] Next, the force of the liquid flowing upward inside the inner cylinder 23 pushes up the lid 32. In this way, the lid 32 moves away from the upper end 231 of the inner cylinder 23. In this way, the valve body 3 opens. That is, the check valve 1 is in the open state. Since the lid 32 is formed integrally with the vertical cylinder 31, when the lid 32 is pushed up, the vertical cylinder 31 also moves upward.

[0036] In this embodiment, the lid 32 is formed integrally with the vertical tube 31, so that even if the force of the liquid flowing upward inside the inner tube 23 is not very strong, the force of the liquid flowing upward inside the vertical tube 31 can reliably push up the lid 32.

[0037] The liquid that has pushed up the lid 32 passes downward through the gap 34 (see FIG. 3B ) and flows so as to overflow outside the inner cylinder 23. In the open state, the lid 32 is pushed up by the force of the liquid flowing upward inside the inner cylinder 23, so that the rubber body 33 comes into contact with the annular contact portion 2021 so as to block the air hole 24.

[0038] In this embodiment, good sealing performance can be obtained even if there is variation in the molding of the rubber body 33. In other words, in this embodiment, the air hole 24 is appropriately blocked by the rubber body 33 even if there is variation in the molding of the rubber body 33.

[0039] In this way, during forward flow, the vent hole 24 is blocked by the rubber body 33. Therefore, the liquid that has flowed into the case 2 through the gap 34 does not leak from the vent hole 24.

[0040] In this embodiment, the gap 34 formed between the vertical cylinder 31 and the inner cylinder 23 is a part of the flow path. This allows the gap 34 to function as a pressure loss portion for the liquid, suppressing the force pushing up the valve body 3 downstream of the gap 34, and floating the valve body 3 (particularly the lid 32) by a predetermined distance from the inner cylinder 23, thereby making it possible to keep the flow path between the lower surface 322 of the lid 32 and the upper surface of the inner cylinder 23 constant.

[0041] In this embodiment, the protrusion 2022 extending downward from the inner upper surface 202 of the upper case portion 21 of the case 2 is inserted into the inside of a rubber tube 331 extending upward from the upper surface of the rubber body 33. This restricts the horizontal movement of the valve body 3 (particularly the rubber body 33) in the internal space 200 of the case 2, and the annular contact portion 2021 comes into contact with the peripheral portion of the upper surface of the rubber body 33 in a well-balanced manner, thereby obtaining good sealing performance.

[0042] In this embodiment, the annular contact portion 2021 protrudes downward from the inner upper surface 202 at a part of the inner upper surface 202 (particularly, the end surface facing downward of the upper case cylindrical portion 211) of the upper case portion 21. This prevents the rubber body 33 from contacting the inner upper surface 202 other than the annular contact portion 2021, reduces the contact area between the rubber body 33 and the inner upper surface 202, increases the contact pressure, and provides even better sealing performance.

[0043] Finally, most of the liquid that has overflowed outside the inner tube 23 is then discharged to the outside of the check valve 1 through the liquid outlet hole 27. When the check valve 1 is incorporated in a sanitary washing device, the liquid discharged to the outside of the check valve 1 through the liquid outlet hole 27 in this manner is supplied to a nozzle provided in the sanitary washing device.

[0044] (Operation of check valve 1 during backflow) 2, during backflow, the liquid is sucked in as indicated by the arrow A4. In other words, during backflow, a negative pressure is applied to the liquid.

[0045] First, liquid is sucked into the lower case internal space 220 from the liquid inlet hole 25 as indicated by the arrow A3, and the liquid in the lower case internal space 220 is sucked in as indicated by the arrow A4, so that the valve body 3 is also sucked in. As a result, the valve body 3 moves downward so that the rubber body 33 moves away from the protrusion 2022 (strictly speaking, the lower end of the protrusion 2022). As a result, the valve body 3 is in close contact with the inner tube 23 so that the lid 32 (strictly speaking, the lower surface 322 of the lid 32) comes into contact with the upper end 231 of the inner tube 23. Desirably, the lower surface 322 of the lid 32 is in close contact with the upper end 231 of the inner tube 23. In this way, the valve body 3 is closed. That is, the state of the check valve 1 is in a closed state. Since the lid 32 is integrally formed with the vertical tube 31, when the lid 32 moves downward, the vertical tube 31 also moves downward.

[0046] In the closed state, the rubber body 33 is separated from the protrusion 2022, and so gas flows from the outside of the check valve 1 through the vent hole 24 to the inside of the case 2, as indicated by the arrow A2 in Fig. 2. The gas that flows in this manner pushes the rubber body 33 downward, further increasing the closed state of the valve body 3.

[0047] In the normal closed state, the flow as shown by the arrow A4 (i.e., backflow) does not occur. However, in the closed state, the flow as shown by the arrow A4 (i.e., backflow) can occur. As shown by the arrow A3 in FIG. 2, even if liquid flows back from the liquid outlet hole 27 into the inside of the case 2, gas flows from the outside of the check valve 1 through the air vent 24 into the inside of the case 2. Furthermore, the gas pushes the rubber body 33 downward. Therefore, the liquid that has flowed back from the liquid outlet hole 27 into the inside of the case 2 is prevented from further flowing back into the liquid inlet hole 25.

[0048] Furthermore, even if dust is caught between the upper end 231 of the inner cylinder 23 and the lid 32 in the closed state, the gas pushes the rubber body 33 downward, increasing the reliability of the closed state of the valve body 3, and the negative pressure is broken. As a result, backflow of liquid is prevented. In other words, since the negative pressure is broken, the liquid is prevented from returning from the liquid outlet hole 27 through the inside of the case 2 to the liquid inlet hole 25. In this way, when dust is caught, the gas is sucked in as shown by the arrow A2, preventing backflow from the liquid outlet hole 27 and breaking the negative pressure.

[0049] In the check valve 1 according to the present embodiment, as shown in FIG. 6, in a plan view, the lower case internal space 220 of the lower part of the case 2 (i.e., the lower case part 22) includes the upper case internal space 210 of the upper part of the case 2 (i.e., the upper case part 21) therein, and the rubber body 33 includes the upper case internal space 210 of the upper part of the case 2 (i.e., the upper case part 21) therein. In other words, the cross-sectional area of ​​the rubber body 33 in the horizontal plane is smaller than the cross-sectional area of ​​the lower case internal space 220 of the lower case part 22 in the horizontal plane. In FIG. 6, the entire rubber body 33 overlaps with the lower case internal space 220. Furthermore, the cross-sectional area of ​​the upper case internal space 210 of the upper case part 21 in the horizontal plane is smaller than the cross-sectional area of ​​the rubber body 33 in the horizontal plane. In FIG. 6, the entire upper case internal space 210 overlaps with the rubber body 33. This makes it possible to reduce the size of the upper case internal space 210 of the upper case portion 21 which does not contribute to the flow of liquid through the case 2, thereby saving space in the internal space 200 and making the case 2 more compact. [Industrial Applicability]

[0050] The check valve according to the present disclosure may desirably be used for a sanitary washing device.

[0051] Aspects derived from the above disclosure are listed below.

[0052] The check valve 1 according to the first embodiment includes a case 2 and a valve body 3. The valve body 3 is incorporated inside the case 2. Inside the case 2, an inner tube 23 extends upward from the inner bottom surface 201 of the case 2 toward the upper part of the case 2 (i.e., the upper case part 21). The case 2 includes at least one air hole 24 provided in the upper part of the case 2, a liquid inlet hole 25 provided in the lower part of the case 2 (i.e., the lower case part 22), and a liquid outlet hole 27. The liquid inlet hole 25 is connected to the inside of the inner tube 23. The valve body 3 includes a vertical tube 31, a lid 32 formed on the upper part of the vertical tube 31, and a rubber body 33 attached to the lid 32. The lid 32 is formed integrally with the vertical tube 31. The vertical tube 31 is provided outside the inner tube 23 so that the inner tube 23 is inserted inside the vertical tube 31. The case 2 has an annular contact portion 2021 that protrudes downward from the inner upper surface 202 facing the inner bottom surface 201 toward the bottom of the case 2. In the case of a forward flow in which the liquid flows from the liquid inlet hole 25 to the liquid outlet hole 27, the lid 32 is separated from the upper end of the inner tube 23, and the rubber body 33 is in contact with the annular contact portion 2021. In the case of a reverse flow in which the liquid is sucked toward the liquid inlet hole 25, the lid 32 is in contact with the upper end of the inner tube 23, and the rubber body 33 is separated from the contact portion 2021.

[0053] The check valve 1 of this embodiment has good sealing properties.

[0054] In the check valve 1 according to the second embodiment, in the first embodiment, a rubber tube 331 extends upward from the upper surface of the rubber body 33. A protrusion 2022 extends downward from the inner upper surface 202 at the top of the case 2. The protrusion 2022 is inserted into the rubber tube 331.

[0055] In this embodiment of the check valve 1, the horizontal movement of the valve body 3 (particularly the rubber body 33) in the internal space 200 of the case 2 is restricted, and the annular contact portion 2021 comes into contact with the peripheral portion of the upper surface of the rubber body 33 in a balanced manner, thereby obtaining good sealing performance.

[0056] In the check valve 1 according to the third embodiment, in the second embodiment, the annular contact portion 2021 protrudes downward from the inner upper surface 202 of the case 2 in a part of the inner upper surface 202 .

[0057] In this embodiment of the check valve 1, the rubber body 33 is prevented from coming into contact with the inner upper surface 202 other than the annular contact portion 2021, thereby reducing the contact area between the rubber body 33 and the inner upper surface 202 and increasing the contact pressure, thereby obtaining even better sealing performance.

[0058] In the check valve 1 according to the fourth aspect, in any one of the first to third aspects, the internal space 200 of the case 2 includes an upper case internal space 210 located at an upper part and a lower case internal space 220 located at a lower part. The upper case internal space 210 and the lower case internal space 220 communicate with each other via the inside of an annular contact portion 2021. In a plan view, the lower case internal space 220 includes the upper case internal space 210 therein, and in a plan view, the rubber body 33 includes the upper case internal space 210 therein.

[0059] In this embodiment of the check valve 1, the upper case internal space 210 of the upper case portion 21, which does not contribute to the flow of liquid through the case 2, can be made smaller, thereby saving space in the internal space 200 and making the case 2 smaller.

[0060] A sanitary washing device according to a fifth aspect includes the check valve 1 according to any one of the first to fourth aspects.

[0061] In this embodiment of the sanitary washing device, the upper case internal space 210 of the upper case portion 21, which does not contribute to the flow of liquid flowing through the case 2 of the check valve 1, can be made smaller, thereby saving space in the internal space 200 and making the case 2 smaller. [Explanation of symbols]

[0062] 1. Check valve 2 Cases 200 Interior space 201 Inner bottom surface 202 Inner top surface 2021 Contact part 2022 Protrusion 203 Outer top surface 204 Outer bottom surface 205 Case side 21 Upper case part 210 Upper case internal space 211 Upper case cylinder 212 Top plate 22 Lower case part 220 Lower case internal space 221 Lower case cylinder 222 Bottom plate part 23 Inner cylinder 231 Upper end 232 Protrusion 24 Ventilation holes 25 Liquid inlet 26 Outer cylinder 27 Bleeding hole 3 Valve body 31 Vertical tube 311 Inner surface 32 Lid 322 Bottom surface 33 Rubber body 331 Rubber Cylinder 34 Gap

Claims

1. A check valve comprising: Cases, and Valve body Equipped with The valve body is incorporated inside the case, Within the case, an inner cylinder extends upward from the inner bottom surface of the case toward the upper portion of the case, The case is At least one ventilation hole provided in the upper portion of the case; A liquid inlet hole provided in the lower part of the case; and Liquid drain hole It is equipped with The liquid inlet hole is in communication with the inside of the inner cylinder, The valve body is vertical tube, A lid formed on the top of the vertical cylinder; and A rubber body attached to the lid It is equipped with The lid is integrally formed with the vertical cylinder, The vertical cylinder is provided outside the inner cylinder so that the inner cylinder is inserted inside the vertical cylinder, the case has an annular contact portion protruding downward from an inner top surface facing the inner bottom surface toward a lower portion of the case, In the case of a forward flow in which the liquid flows from the liquid inlet hole to the liquid outlet hole, the lid is spaced from the upper end of the inner cylinder, and the rubber body is in contact with the annular contact portion, In the case of a reverse flow in which liquid is sucked toward the liquid inlet hole, the lid is in contact with the upper end of the inner cylinder, and the rubber body is spaced from the contact portion. Check valve.

2. 2. The check valve according to claim 1, A rubber tube extends upward from the upper surface of the rubber body, A protrusion extends downward from the inner upper surface of the upper portion of the case, and The protrusion is inserted into the rubber tube. Check valve.

3. 3. The check valve according to claim 2, The annular contact portion protrudes downward from a portion of the inner upper surface. Check valve.

4. 2. The check valve according to claim 1, The internal space of the case is An internal space of the upper case located at the upper portion; The internal space of the lower case located at the bottom; Equipped with the upper case internal space and the lower case internal space are in communication with each other via the inside of the annular contact portion, In a plan view, the lower case internal space includes the upper case internal space therein, and In the plan view, the rubber body includes the upper case internal space therein. Check valve.

5. A sanitary washing device comprising the check valve according to claim 1.

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