JP2016217596A - Screw, pipeline cover and water heater set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screw hard to be loosened, and a pipeline cover and water heater set including the screw.SOLUTION: A screw is screwed into a screw hole SH of a fastened member 20. A screw 30 has a head part 31 and a shaft part 32. For the screw 30, in a state where a screw thread ST of the shaft part 32 is screwed into the screw hole SH of the fastened member 20, a part of one end surface 31a contacts with the fastened member 20 to thereby bring the screw thread ST of the shaft part 32 into one-sided contact with the screw hole SH.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a screw, a piping cover, and a water heater set, and more particularly, to a screw that is screwed into a screw hole of a member to be fastened, and a piping cover and a water heater set provided with the screw.

  Conventionally, when a water heater is installed on the wall or ground of a building, a pipe cover that covers a pipe connected to the water heater has been used. By preventing the pipe from being exposed by the pipe cover, it is possible to protect the pipe and not to impair the aesthetic appearance.

  Specifically, the piping cover includes a fixed portion fixed to a wall surface or the like, a lid portion that can be attached to and detached from the fixed portion, and a screw that can fasten the lid portion to the fixed portion. When the pipe cover is used, the lid portion is fastened to the fixed portion by screws. At the time of maintenance, the operator removes the screw and releases the fastening between the fixed portion and the lid portion. And a cover part is removed from a fixing | fixed part and it becomes possible to approach piping. Such a piping cover is described in, for example, Japanese Patent Application Laid-Open No. 2007-32940 (Patent Document 1).

JP 2007-32940 A

  In the pipe cover described in the above publication, when the screw is loose, the cover part vibrates with respect to the fixed part by blowing wind on the pipe cover. This vibration may cause the screw to further loosen and come off.

  This invention is made | formed in view of the said subject, The objective is to provide the screw which is hard to loosen, a piping cover provided with the same, and a water heater set.

  The screw of the present invention is a screw that is screwed into a screw hole of a member to be fastened. The screw includes a head portion and a shaft portion. The head has one end surface and the other end surface facing the one end surface. The shaft portion protrudes from the one end surface to the opposite side to the other end surface, and a screw thread is formed. The one end surface is configured such that one side becomes higher and the other side becomes lower across the shaft portion. The screw is configured such that a part of one end surface abuts the member to be fastened and the screw part of the shaft part comes into contact with the screw hole in a state where the screw thread of the shaft part is screwed into the screw hole of the member to be fastened. It is configured.

  According to the screw of the present invention, the one end surface of the head is configured such that one side is higher and the other side is lower across the shaft portion. And a part of one end surface of a head contacts a member to be fastened, and a screw thread of a shaft part can be made to hit a screw hole. For this reason, it is possible to make the screw difficult to loosen. Therefore, it is possible to make it difficult to remove the screw.

  In the above screw, the head portion includes a main body portion and a protruding portion. A shaft portion is connected to the main body portion. The protruding portion protrudes from the main body portion in the direction in which the shaft portion protrudes. The protrusion includes a part of one end surface. For this reason, when the protrusion comes into contact with the member to be fastened, the thread of the shaft portion can be brought into contact with the screw hole. Thereby, a screw can be made hard to loosen.

  In the above screw, the one end surface includes an inclined surface inclined from one side to the other side. For this reason, a shaft part can be made to incline because an inclined surface contacts a member to be fastened. Thereby, the screw thread of a shaft part can be made to strike a screw hole. Thereby, a screw can be made hard to loosen.

  In the above screw, the shaft portion includes first and second screw portions and a screwless portion. The first and second screw portions are threaded apart from each other in the axial direction. The unthreaded portion is sandwiched between the first and second threaded portions and has no thread. The diameter of the unthreaded portion is smaller than the diameter of each thread of the first and second threaded portions. For this reason, when the screw is loosened and the unthreaded portion is positioned in the screw hole, the screw thread and the screw hole are disengaged. Thereby, it can prevent that a screw further loosens.

  The piping cover of the present invention includes the above screw and a member to be fastened. The member to be fastened includes a fixing portion and a lid portion that covers the fixing portion. The fixing part has a screw hole. The lid portion has a through hole communicating with the screw hole. The screw is screwed into the screw hole through the through hole. For this reason, even if a cover part vibrates with respect to a fixing | fixed part with wind, a screw can be made hard to loosen. Thereby, it can suppress that a screw remove | deviates by the vibration by a wind, and a cover part is removed from a fixing | fixed part.

  In the above piping cover, the fastening member is made of metal and the head is made of resin. For this reason, since a head is softer than a to-be-fastened member, it can suppress that a to-be-fastened member is damaged by a head contacting the to-be-fastened member.

  The water heater set of the present invention is a water heater set including the above-described pipe cover and a water heater connected to the pipe. The piping cover covers the piping connected to the water heater. For this reason, the water heater set provided with the piping cover which can suppress that a cover part is removed from a fixing | fixed part by the vibration by a wind can be provided.

  As described above, according to the present invention, it is possible to provide a screw that is difficult to loosen and a pipe cover and a water heater set including the screw.

It is a perspective view which shows roughly the structure of the water heater set in one embodiment of this invention. It is the schematic which shows schematically the structure of the water heater in one embodiment of this invention. It is a disassembled perspective view which decomposes | disassembles and shows the piping cover of the water heater set of FIG. It is a perspective view which shows roughly the structure of the screw in one embodiment of this invention. It is a fragmentary sectional view which shows roughly the structure of the screw in one embodiment of this invention. It is a fragmentary sectional view showing roughly the state where the screw in one embodiment of the present invention was screwed to the piping cover. It is a fragmentary sectional view showing roughly the state where the screw in one embodiment of the present invention loosened. It is a perspective view which shows roughly the structure of the screw in the modification 1 of one embodiment of this invention. It is a fragmentary sectional view which shows roughly the structure of the screw in the modification 1 of one embodiment of this invention. It is a fragmentary sectional view which shows roughly the state in which the screw in the modification 1 of one embodiment of this invention was screwed by the piping cover. It is a fragmentary sectional view showing roughly the state where the screw in modification 1 of one embodiment of the present invention loosened. It is a perspective view which shows roughly the structure of the screw in the modification 2 of one embodiment of this invention. It is a fragmentary sectional view which shows roughly the structure of the screw in the modification 2 of one embodiment of this invention. It is a perspective view which shows roughly the structure of the screw in the modification 3 of one embodiment of this invention. It is a fragmentary sectional view which shows roughly the structure of the screw in the modification 3 of one embodiment of this invention. It is a fragmentary sectional view showing roughly the state where the screw of the comparative example was loosened.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the structure of the water heater set in one embodiment of the present invention will be described. In the following, each direction is based on the state where the water heater set is installed. Unless otherwise specified, the same reference numerals are given to the same components, and the description thereof is not repeated.

  With reference to FIG. 1, the present embodiment describes a case where a water heater set is installed on a wall surface 100 of a building, but the water heater set may be installed on the ground 101. In the present embodiment, a latent heat recovery type water heater that can recover latent heat will be described, but the water heater may not include a heat exchanger for recovering latent heat.

  With reference to FIG. 1, the water heater set of the present embodiment mainly includes a water heater 10 and a piping cover PC. The water heater 10 is installed on the wall surface 100 of the building. A pipe is connected to the water heater 10. Specifically, a water supply pipe P1, a hot water supply pipe P2, and a gas pipe P3 of a building are connected to the water heater 10, respectively. The piping cover PC is installed on the wall surface 100 of the building.

  The pipe cover PC can protect the pipe by preventing the pipe from being exposed, and can also prevent the appearance from being impaired. The piping cover PC covers the water heater, the water supply pipe P1, the hot water supply pipe P2, and the gas pipe P3, respectively.

  With reference to FIG. 1 and FIG. 2, the water heater 10 in this Embodiment is the housing | casing 1, the burner 2, the air blower 3, the primary heat exchanger 4, the secondary heat exchanger 5, and the inside. It mainly has a sump 6, a controller 7, a hot water supply path 8, and a gas path FC.

  The housing 1 has a front surface (front surface) 1a, a top surface (upper surface) 1b, a bottom surface (lower surface) 1c, a pair of side surfaces 1d, and a rear surface (back surface) 1e. The direction in which the front surface 1 a and the rear surface 1 e face each other is the front-rear direction of the housing 1. The direction in which the top surface 1 b and the bottom surface 1 c face each other is the vertical direction of the housing 1. The direction in which the pair of side surfaces 1d face each other is the width direction (left-right direction) of the housing 1.

  The front surface 1a of the housing 1 is provided with an exhaust port EP for exhausting combustion gas. The exhaust port EP communicates with the inside and outside of the water heater 10. Further, the front surface 1 a of the housing 1 is provided with an intake port IP for taking air into the housing 1. The intake port IP communicates with the inside and outside of the water heater 10. A plurality of intake ports IP are provided.

  The housing 1 has a space surrounded by a front surface (front surface) 1a, a top surface (upper surface) 1b, a bottom surface (lower surface) 1c, a pair of side surfaces 1d, and a rear surface (back surface) 1e. In this space, the burner 2, the blower 3, the primary heat exchanger 4, the secondary heat exchanger 5, the neutralizer 6, the controller 7, the hot water supply path 8, and the gas path FC are accommodated. Has been.

  The burner 2 is configured to be able to supply combustion gas. The combustion gas is for exchanging heat between the primary heat exchanger 4 and the secondary heat exchanger 5. The blower 3 is for supplying combustion air to the burner 2. The air blower 3 is configured to be able to blow air taken into the housing 1 from the air inlet IP to the burner 2. The blower 3 is specifically a fan, for example.

  The primary heat exchanger 4 is for recovering sensible heat of the combustion gas supplied by the burner 2. The secondary heat exchanger 5 is for recovering the latent heat of the combustion gas supplied by the burner 2. The primary heat exchanger 4 and the secondary heat exchanger 5 are connected to each other. The primary heat exchanger 4 and the secondary heat exchanger 5 each have a heat transfer tube capable of circulating water as a fluid to be heated, and a heat exchanger case capable of accommodating the heat transfer tube. The combustion gas flows around the heat transfer tube inside the heat exchanger case.

  The combustion gas after heat exchange in the primary heat exchanger 4 is passed to the secondary heat exchanger 5 so that water, which is a fluid to be heated in the secondary heat exchanger 4, is preheated. In this process, the temperature of the combustion gas is lowered to about 60 ° C., whereby moisture contained in the combustion gas is condensed and latent heat is recovered. Then, drainage is generated by collecting the latent heat of the combustion gas.

  The drain receiver DR is disposed below the secondary heat exchanger 5 and configured to receive the drain generated in the secondary heat exchanger 5. The first drain pipe DP1 connects the drain receiver DR and the neutralizer 6. The drain is sent from the drain receiver DR to the neutralizer 6 through the first drain pipe DP1.

  The neutralizer 6 is for neutralizing the drain generated by recovering the latent heat of the combustion gas in the secondary heat exchanger 5. This drain becomes acidic because nitrogen oxides in the exhaust gas are dissolved therein. The neutralizer 6 is filled with a neutralizing agent, and acidic drainage can be neutralized by the neutralizing agent. The second drain pipe DP2 connects the neutralizer 6 and the drain outlet DO. The drain neutralized by the neutralizer 6 is discharged out of the housing 1 from the drain outlet DO through the second drain pipe DP2.

  The controller 7 is for controlling the burner 2 and the blower 3. The controller 7 is also for controlling a display unit (not shown). The controller 7 is electrically connected to each of the burner 2 and the blower 3.

  The hot water supply path 8 is for supplying the hot water exchanged with the combustion gas in the primary heat exchanger 4 and the secondary heat exchanger 5 to the outside of the hot water heater 10. The hot water supply path 8 has a water supply pipe 8a, a hot water supply pipe 8b, a water inlet IW, and a hot water outlet OW. A water supply pipe P1 is connected to the water inlet IW. A hot water supply pipe P2 is connected to the hot water outlet OW.

  The water supply pipe 8a is configured to be able to supply water as the fluid to be heated to the secondary heat exchanger 5 from the water inlet IW. The hot water supply pipe 8b connects the primary heat exchanger 4 and the hot water outlet OW. The hot water supply pipe 8b is configured to supply hot water heated by the primary heat exchanger 4 and the secondary heat exchanger 5 from the primary heat exchanger 4 to the outlet OW. Thereby, when the water supplied from the water inlet IW passes through the secondary heat exchanger 5 and the primary heat exchanger 4, it is heated by the combustion gas and supplied from the hot water outlet OW.

  The gas path FC is for supplying combustion gas to the burner 2. The gas path FC has a gas pipe FP and a gas supply port FI. The gas pipe FP is configured to be able to supply the combustion gas supplied from the gas supply port FI to the burner 2. The gas supply port FI is connected to the gas pipe P3.

  With reference to FIGS. 1 and 3, piping cover PC in the present embodiment is attached to water heater 10. The piping cover PC is installed on the bottom surface (lower surface) 1 c side of the water heater 10. The piping cover PC mainly has a fastened member 20 and a screw 30. The fastened member 20 mainly includes a fixing portion 21, a lid portion 22, and a pair of washers 23.

  The fixing portion 21 mainly includes a pair of side surface portions 21a, a first support portion 21b, a pair of attachment portions 21c, a second support portion 21d, and a third support portion 21e. The pair of side surface portions 21a constitutes a pair of side surfaces of the piping cover PC. The pair of side surface portions 21 a are configured to be along the pair of side surfaces 1 d of the housing 1, respectively.

  The 1st support part 21b is comprised so that a pair of side part 21a may be connected. The first support portion 21 b is disposed on the lid portion 22 side of the fixed portion 21. Specifically, the first support portion 21 b is disposed at the front end portion of the fixed portion 21. In addition, the first support portion 21 b is disposed at the upper end portion of the fixed portion 21.

  The pair of attachment portions 21c are attached to both end portions in the left-right direction of the first support portion 21b. The pair of attachment portions 21c protrude from the first support portion 21b to the lid portion 22 side. Each of the pair of attachment portions 21c has a screw hole SH. Each screw hole SH penetrates each attachment portion 21 c in the front-rear direction of the fixing portion 21.

  The 2nd support part 21d and the 3rd support part 21e are comprised so that a pair of side part 21a may be connected, respectively. The second support portion 21 d is disposed at the front end portion of the fixed portion 21. The third support portion 21 e is disposed at the rear end portion of the fixed portion 21. In addition, the second support portion 21 d and the third support portion 21 e are arranged at the lower end portion of the fixed portion 21.

  The lid portion 22 mainly has a front surface portion 22a and a pair of through holes 22b. The front surface part 22a constitutes the front surface of the piping cover PC. The pair of through holes 22b penetrate the front surface portion 22a in the front-rear direction of the front surface portion 22a. Each through hole 22b communicates with each screw hole SH.

  The pair of washers 23 are respectively disposed between the attachment portion 21c and the front surface portion 22a. Each washer 23 communicates with each screw hole SH and each through hole 22b. Each washer 23 is configured to allow the screw 30 to be inserted therethrough.

  3 and 4, the screw 30 is screwed into the screw hole SH of the fastened member 20. The screw 30 is screwed into the screw hole SH through the through hole 22b. The screw 30 mainly has a head portion 31 and a shaft portion 32.

  Referring to FIGS. 4 and 5, head portion 31 mainly has one end surface 31a, the other end surface 31b, a groove portion 31c, and a receiving portion 31d. The one end face 31a is configured such that one side S1 is high and the other side S2 is low across the shaft portion 32. The other end surface 31b faces the one end surface 31a. The groove 31c is recessed from the other end surface 31b toward the one end surface 31a. The receiving portion 31 d is engaged with the overhanging portion PR of the shaft portion 32.

  The shaft portion 32 protrudes from the one end surface 31a to the side opposite to the other end surface 31b. The shaft portion 32 is formed with a screw thread ST. The screw thread ST is formed on the outer peripheral surface of the shaft portion 32. The shaft portion 32 has a protruding portion PR at the end portion on the head portion 31 side. The overhanging portion PR protrudes from the screw thread ST in the radial direction of the shaft portion 32. The shaft portion 32 is fixed to the head portion 31 by the overhanging portion PR engaging the receiving portion 31d.

  The head 31 has a main body MP and a protrusion PP. A shaft portion 32 is connected to the main body portion MP. The protruding part PP protrudes in the direction in which the shaft part 32 protrudes from the main body part MP. The protruding part PP includes a part of the one end face 31a. The one side S1 protrudes in the direction in which the shaft portion 32 protrudes from the main body portion MP than the other side S2. The one end surface 31a includes an inclined surface SL that is inclined from the one side S1 to the other side S2. The inclined surface SL is inclined with respect to the axial direction of the shaft portion 32.

  With reference to FIGS. 6 and 7, the screw 30 is configured such that a part of one end surface 31 a is attached to the fastened member 20 in a state where the screw thread ST of the shaft portion 32 is screwed into the screw hole SH of the fastened member 20. By abutting, the screw thread ST of the shaft portion 32 is configured to come into contact with the screw hole SH. Specifically, as shown in FIG. 6, one side S <b> 1 of one end surface 31 a abuts on the lid portion 22 in a state where the screw thread ST of the shaft portion 32 is screwed into the screw hole SH of the fixing portion 21.

  As shown in FIG. 7, when the screw 30 is loosened, the wind that has flowed into the fixing portion 21 and the wind that has flowed into the gap between the fixing portion 21 and the lid portion 22 blow from the fixing portion 21 side to the lid portion 22. As a result, the lid portion 22 moves away from the fixed portion 21 and comes into contact with the one end surface 31a. For this reason, the thread ST of the shaft portion 32 comes into contact with the screw hole SH. The fastened member 20 may be made of metal, and the head portion 31 may be made of resin.

Next, a modification of the present embodiment will be described.
With reference to FIG. 8 and FIG. 9, a screwless portion 32 c sandwiched between a first screw portion 32 a and a second screw portion 32 b is provided as in the screw 30 of the first modification in the present embodiment. May be. In the screw 30 according to the first modification of the present embodiment, the shaft portion 32 mainly includes a first screw portion 32a, a second screw portion 32b, a screwless portion 32c, and a tip portion 32d. Yes.

  The first screw portion 32a and the second screw portion 32b are separated from each other in the axial direction, and a screw thread ST is formed. The screwless portion 32c is sandwiched between the first screw portion 32a and the second screw portion 32b. The screw thread ST is not formed in the unthreaded portion 32c. The diameter of the unthreaded portion 32c is smaller than the diameter of each thread ridge ST of the first threaded portion 32a and the second threaded portion 32b. The distal end portion 32 d is located at the distal end of the shaft portion 32. That is, the tip 32d is located on the opposite side of the first screw 32a with respect to the second screw 32b. The tip 32d is not formed with a thread ST.

  Referring to FIG. 10, in a state where screw thread ST of first threaded portion 32a is screwed into threaded hole SH of fixed portion 21, second threaded portion 32b and unthreaded portion 32c are threaded into hole SH. Does not touch.

  Referring to FIG. 11, when the screw is loosened, the wind that has flowed into the fixing portion 21 and the wind that has flowed into the gap between the fixing portion 21 and the lid portion 22 are blown to the lid portion 22 from the fixing portion 21 side. As a result, the lid portion 22 moves away from the fixed portion 21 and comes into contact with the one end surface 31a. When the first screw portion 32a rotates in the loosening direction of the screw 30 and is removed from the screw hole SH, the unthreaded portion 32c is positioned in the screw hole SH. Thereby, the screw engagement of the screw thread ST and the screw hole SH is released. And since the diameter of the screwless part 32c is smaller than the diameter of each screw thread ST of the 1st screw part 32a and the 2nd screw part 32b, the screwless part 32c falls below so that it may fall in the screw hole SH. Moving. For this reason, when the wind blows on the cover part 22, the screw 30 is rotated in the direction in which the screw 30 is loosened, and the second screw part 32b is prevented from being screwed into the screw hole SH.

  Referring to FIGS. 12 and 13, screw 2 of Modification 2 in the present embodiment is different from screw 30 of Modification 1 in that flat surface portion FS is provided. The plane part FS is formed so as to be orthogonal to the axial direction of the shaft part 32. The flat surface portion FS is formed on a part of the inclined surface SL. The flat surface portion FS is disposed on one side S1 of the inclined surface SL. On the other hand, the end surface 31a includes a flat surface portion FS.

  Referring to FIGS. 14 and 15, screw 30 of Modification 3 in the present embodiment is mainly different from screw 30 of the present embodiment shown in FIGS. 4 and 5 in the configuration of protrusion PP. The protrusion part PP has a columnar shape. The diameter of the projecting portion PP is smaller than the diameter of the shaft portion 32. The protruding portion PP is formed on a part of the one end surface 31a. On the other hand, the end surface 31a includes the tip surface TS of the projecting portion PP.

  Next, the effect of this embodiment will be described in comparison with the screw of the comparative example. In addition, unless it mentions specially about the screw of a comparative example, about the same structure as said this Embodiment, the same code | symbol is attached | subjected and the description is not repeated.

  Referring to FIG. 16, in the screw 30 of the comparative example, the height of one end face 31a is uniform. That is, the axial direction of the shaft portion 32 and the one end surface 31a are orthogonal to each other. Therefore, in this comparative example, even if the one end face 31a abuts on the fastened member 20 in a state where the screw thread ST of the shank 32 is screwed into the screw hole SH of the fastened member 20, the screw of the shank 32 The mountain ST does not hit the screw hole SH. Therefore, when the screw 30 is loose, the wind that has flowed into the fixed portion 21 and the wind that has flowed into the gap between the fixed portion 21 and the lid portion 22 are blown onto the lid portion 22 from the fixed portion 21 side. The part 22 is separated from the fixed part 21 and contacts the one end surface 31a. Further, when the wind blows toward the fixed portion 21 on the front surface 22 a of the cover portion 22, the cover portion 22 contacts the fixed portion 21. The movement of the lid portion 22 is repeated by the wind. In this manner, the lid portion 22 may vibrate with respect to the fixing portion 21 due to the wind, and the screw 30 may be further rotated in a loosening direction, so that the screw 30 may come off the screw hole SH.

  On the other hand, as shown in FIGS. 4 and 7, according to the screw 30 of the present embodiment, the one end surface 31 a of the head 31 has a higher one side S <b> 1 across the shaft portion 32 and the other end. The side S2 is configured to be low. Then, a part of the one end surface 31a of the head portion 31 abuts on the fastened member 20, whereby the screw thread ST of the shaft portion 32 can be brought into contact with the screw hole SH. For this reason, the screw 30 can be made difficult to loosen. Therefore, the screw 30 can be made difficult to come off.

  As shown in FIG. 4 and FIG. 7, in the screw 30 of the present embodiment, the head portion 31 includes a main body MP and a protrusion PP. The protruding portion PP protrudes from the main body MP in the direction in which the shaft portion 32 protrudes. The protruding part PP includes a part of the one end face 31a. For this reason, when the projecting portion PP abuts on the member 20 to be fastened, the screw thread ST of the shaft portion 32 can be allowed to come into contact with the screw hole SH. Thereby, the screw 30 can be made difficult to loosen.

  As shown in FIGS. 4 and 7, in the screw 30 of the present embodiment, one end surface 31a includes an inclined surface SL that is inclined from one side S1 to the other side S2. For this reason, the shaft part 32 can be inclined by the inclined surface SL coming into contact with the fastened member 20. Thereby, the screw thread ST of the axial part 32 can be made to contact | win the screw hole SH. Thereby, the screw 30 can be made difficult to loosen.

  As shown in FIGS. 8 and 10, in the screw 30 of the first modification of the present embodiment, the shaft portion includes a first screw portion 32a, a second screw portion 32b, and an unthreaded portion 32c. Contains. The unthreaded portion 32c is sandwiched between the first threaded portion 32a and the second threaded portion 32b and is not formed with the screw thread ST. The diameter of the unthreaded portion 32c is smaller than the diameter of each thread ridge ST of the first threaded portion 32a and the second threaded portion 32b. For this reason, the screw 30 is loosened and the unthreaded portion 32c is positioned in the screw hole SH, so that the screw thread ST and the screw hole SH are unscrewed. Thereby, the screw 30 can be prevented from further loosening.

  As shown in FIGS. 3 and 6, the piping cover PC according to the present embodiment includes the above-described screw 30 and the fastened member 20. The fastened member 20 includes a fixing portion 21 and a lid portion 22 that covers the fixing portion 21. The fixing portion 21 has a screw hole SH. The lid portion 22 has a through hole 22b that communicates with the screw hole SH. The screw 30 is screwed into the screw hole SH through the through hole 22b. For this reason, even if the cover part 22 vibrates with respect to the fixing | fixed part 21 with a wind, the screw 30 can be made hard to loosen. Thereby, it can suppress that the screw | thread 30 remove | deviates by the vibration by a wind, and the cover part 22 is removed from the fixing | fixed part 21. FIG.

  As shown in FIGS. 3 and 6, in the piping cover PC of the present embodiment, the fastened member 20 is made of metal, and the head portion 31 is made of resin. For this reason, since the head part 31 is softer than the to-be-fastened member 20, it can suppress that the to-be-fastened member 20 is damaged by the head 31 contacting the to-be-fastened member 20. FIG.

  As shown in FIGS. 1 and 3, a hot water heater set of the present embodiment includes a hot water heater provided with the above-described piping cover PC and a hot water heater 10 connected to the water supply pipe P1, the hot water supply pipe P2, and the gas pipe P3. It is a container set. The piping cover PC covers the water supply pipe P1, the hot water supply pipe P2, and the gas pipe P3. For this reason, the water heater set provided with piping cover PC which can suppress that cover 22 is removed from fixed part 21 by vibration by wind can be provided.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1 housing, 2 burner, 3 blower, 4 primary heat exchanger, 5 secondary heat exchanger, 6 neutralizer, 7 controller, 8 hot water supply path, 8a hot water supply pipe, 8b hot water supply pipe, 10 hot water supply, 20 covered Fastening member, 21 fixing portion, 21a side surface portion, 21b first support portion, 21c mounting portion, 21d second support portion, 21e third support portion, 22 lid portion, 22a front surface portion, 22b through hole, 23 washer 30 screw, 31 head, 31a one end face, 31b other end face, 31c groove, 31d receiving part, 32 shaft part, 32a first screw part, 32b second screw part, 32c unthreaded part, 32d tip part, 100 wall surface, 101 ground, DO drain discharge port, DP1 first drain piping, DP2 second drain piping, EP exhaust port, FC gas path, FI gas supply port, FP gas distribution , FS plane, IP inlet, IW inlet, MP body, OW outlet, P1 water supply pipe, P2 hot water supply pipe, P3 gas pipe, PC pipe cover, PP protrusion, PR overhang, S1 one side, S2 The other side, SH screw hole, SL inclined surface, ST thread, TS tip surface.

Claims (7)

A screw to be screwed into a screw hole of a fastened member,
A head having one end surface and the other end surface facing the one end surface;
A shaft portion that protrudes from the one end surface to the opposite side of the other end surface and that has a thread formed thereon;
The one end surface is configured such that one side is higher and the other side is lower across the shaft portion,
In a state where the screw thread of the shaft portion is screwed into the screw hole of the fastened member, a part of the one end surface comes into contact with the fastened member so that the screw thread of the shaft portion is screwed. A screw that is configured to allow a hole to hit a piece. The head is
The main body to which the shaft is connected;
A projecting portion projecting in a direction in which the shaft portion projects from the main body portion,
The screw according to claim 1, wherein the protrusion includes a part of the one end surface.   The screw according to claim 1 or 2, wherein the one end surface includes an inclined surface inclined from the one side to the other side. The shaft portion includes first and second screw portions in which the screw threads are formed apart from each other in the axial direction, and a screw that is sandwiched between the first and second screw portions and in which the screw threads are not formed. Including no part,
The screw according to any one of claims 1 to 3, wherein a diameter of the unthreaded portion is smaller than a diameter of the thread of each of the first and second threaded portions. The screw according to any one of claims 1 to 4,
A pipe cover comprising the fastened member,
The fastened member is
A fixed part;
A lid that covers the fixed part,
The fixing portion has the screw hole,
The lid portion has a through hole communicating with the screw hole,
The piping cover, wherein the screw is screwed into the screw hole through the through hole. The fastened member is made of metal,
The piping cover according to claim 5, wherein the head is made of resin. A piping cover according to claim 5 or 6,
A water heater set comprising a water heater connected to the pipe,
The pipe cover is a water heater set that covers the pipe connected to the water heater.

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