JP7019385B2 - Sealed structure and pumping equipment - Google Patents

Description

The present invention relates to a sealing structure and a pump device for sealing a hole.

Currently, a pump device called a so-called submersible pump installed in water is known as a means for draining sewage or the like in a sewage tank (see, for example, Patent Document 1). Such a pump device includes a pump in which an impeller is housed in a pump casing having a pump chamber, and a motor for rotating the impeller. In the pump device, the impeller is driven by a motor, the impeller rotates in the pump chamber, and the liquid sucked into the pump chamber is increased in pressure and discharged to the secondary side.

Since such a pump device is arranged in the sewage collected in the sewage tank, a technique of shaft sealing between the rotating shaft and the pump casing with a mechanical seal is used. Therefore, the pump device includes a seal chamber for accommodating a lubricant such as a mechanical seal and oil, a hole for supplying the lubricant to the seal chamber, and a plug for sealing the hole. Such a plug is provided with a shaft portion having a head and a male screw screwed with a female screw provided in the hole portion, and the hole portion is closed by screwing into the hole portion and is provided in the plug. An O-ring seals between the head of the plug and the seating surface around the hole.

Japanese Unexamined Patent Publication No. 2015-116048

In the above-mentioned plug, the O-ring is crushed between the head of the plug and the seating surface around the hole to seal the space between the head and the seating surface. Excessive stress is applied to the female thread. However, in order to obtain the strength to withstand the stress, it is necessary to form the plug with a metal material, and there is a problem that the manufacturing cost of the plug increases. Furthermore, since the plug is exposed to sewage when the pump device is used in the sewage tank, the material used for the plug is also required to have high corrosion resistance.

Therefore, an object of the present invention is to provide a sealed structure and a pump device that can be manufactured at low cost.

In order to solve the above problems and achieve the object, the sealed structure and the pump device of the present invention are configured as follows.

As one aspect of the present invention, the sealing structure is provided at both ends of the columnar supported portion and the supported portion in the axial direction, and a pair of flanges larger in the radial direction of the supported portion than the outer diameter of the supported portion. And a support provided on the cable having a cable boot provided on one of the pair of flanges, a head portion, a cylindrical middle portion provided on the head portion, and a male screw provided at the tip of the middle portion. A fastening member having a seal groove provided on the outer peripheral surface of the middle portion, a plug having an O-ring provided in the seal groove, and a clip for supporting the supported portion integrally provided with the plug, and the above. It includes a seat surface that comes into contact with the head portion, a seal portion that opens in the center of the seat surface and faces the middle portion, and a fastened member having a female screw portion that is continuously provided on the seal portion. ..

As one aspect of the present invention, the pump device includes a seal chamber for accommodating a mechanical seal, a seat surface, a seal portion opening in the center of the seat surface, and a female screw portion continuously provided in the seal portion. A pump having a member to be fastened to supply a lubricant to the seal chamber, a motor fixed to the upper part of the pump, an electrical component provided on the upper part of the motor, and one end connected to the electrical component. A pair of flanges and a pair of flanges that are provided at both ends of the columnar supported portion and the supported portion in the axial direction and are larger in the radial direction of the supported portion than the outer diameter of the supported portion. A float switch having a support provided on the cable having a cable boot provided on one side and a float provided on the other end of the cable, a head portion facing the seat surface, and a seal portion. It has a cylindrical middle portion provided in the facing head portion, a male screw portion provided at the tip of the middle portion, a seal groove provided on the outer peripheral surface of the middle portion, and an O-ring provided in the seal groove. A plug and a fastening member having a clip for supporting the supported portion provided integrally with the plug are provided.

According to the present invention, it is possible to provide a sealed structure and a pump device that can be manufactured at low cost.

The side view which shows the structure of the pump device which concerns on one Embodiment of this invention with a partial cross section. FIG. 5 is an enlarged cross-sectional view showing the sealed structure of the pump device. The perspective view which shows the structure of the casing cover of the same sealed structure. The perspective view which shows the structure of the plug of the same sealed structure.

Hereinafter, the pump device 1 using the sealed structure 2 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4.
FIG. 1 is a side view showing a configuration of a pump device 1 according to an embodiment of the present invention in a partial cross section, FIG. 2 is an enlarged cross-sectional view showing a sealed structure 2 of the pump device 1, and FIG. 3 is a sealed structure 2. FIG. 4 is a perspective view showing the configuration of the supply hole 38 provided in the casing cover 24, and FIG. 4 is a perspective view showing the configuration of the plug 39 constituting the sealing structure 2.

As shown in FIG. 1, the pump device 1 includes a motor 11, a pump 12 to which the motor 11 is fixed at an upper portion, a seal member 13 provided between the motor 11 and the pump 12, and a plurality of float switches 14. A cable support structure 15 for supporting the float switch 14 and an electrical component 16 are provided. Further, the pump device 1 has a sealing structure 2 that seals between the internal space and the external space provided in the motor 11 and the pump 12. The sealed structure 2 has a fastened member 2A and a fastened member 2B.

In the present embodiment, the sealing structure 2 is used to close the supply hole 38 that supplies the lubricant to the sealing chamber 25, which will be described later. Such a pump device 1 is, for example, a so-called submersible sewage pump installed in a sewage tank, a sewer, or the like to send sewage containing foreign matter (dirt, etc.).

The motor 11 includes a stator and a rotor rotated by the stator in the motor casing, and the rotating shaft 21 is connected to the rotor. The motor 11 is, for example, a permanent magnet motor.

The pump 12 includes a rotating shaft 21, an impeller 22 fixed to the rotating shaft 21, a pump casing 23 for accommodating the impeller 22, and a casing cover 24 for covering the pump casing 23.

The rotating shaft 21 is directly or indirectly connected to the rotor of the motor 11 and is formed to be rotatable following the rotation of the rotor. The rotary shaft 21 is rotatably supported by, for example, a motor casing via a bearing such as a bearing.

The impeller 22 is formed so as to be insertable into, for example, the pump casing 23. The impeller 22 is formed so that water can be pumped by rotating in the pump casing 23. The impeller 22 is, for example, a semi-open type impeller in which a plurality of blades are provided on a single disk-shaped shroud.

As shown in FIG. 1, the pump casing 23 has a suction port 31 arranged downward with the pump device 1 installed on the installation surface, a discharge port 32 formed on a part of the outer peripheral surface, and a suction port 31. A pump chamber 33 connected to the discharge port 32 and an opening 34 provided at a position facing the motor casing and continuous with the pump chamber 33 are provided. Further, the pump casing 23 is provided with a plurality of legs 37 for installing the pump device 1 on the lower surface thereof.

The suction port 31 is arranged with a predetermined gap from the installation surface of the pump device 1. The discharge port 32 is fluidly connected to, for example, a part of the pump chamber 33 in the radial direction. The discharge port 32 opens with the axial direction of the opening end facing upward. A pipe is connected to the discharge port 32.

The pump chamber 33 is formed so that the impeller 22 can be accommodated. Further, the pump chamber 33 has an inner peripheral surface capable of forming a volute-shaped flow path that can guide the liquid boosted by the impeller 22 to the discharge port 32.

The opening 34 has an inner diameter into which the impeller 22 can be inserted into the pump chamber 33. The mounting surface 35 is formed so as to be in contact with the end surface of the casing cover 24.

A plurality of legs 37 are arranged around the suction port 31 at equal intervals. The legs 37 are configured to have a length that allows the suction port 31 to be arranged at a predetermined height from the installation surface of the pump device 1 with the pump device 1 installed on the installation surface.

The casing cover 24 is connected to the pump casing 23 and covers the opening 34 of the pump casing 23. The casing cover 24 is connected to the motor casing. The casing cover 24, together with the motor casing, constitutes the seal chamber 25.

The seal chamber 25 includes a supply hole 38 formed in the casing cover 24 and a plug 39 that closes the supply hole 38. The supply hole 38 constitutes the fastening member 2A, and the plug 39 constitutes the fastening member 2B. That is, the supply hole 38 and the plug 39 form the sealing structure 2.

The supply hole 38 includes a seat surface 38a, a seal portion 38b formed by opening the center of the seat surface 38a in a columnar shape, a female screw portion 38c provided continuously with the seal portion 38b, and a seat surface 38a. It has a recess 38d provided in the.

The seat surface 38a is formed in an annular shape. The seal portion 38b is formed by opening in a columnar shape having a predetermined length in the axial direction, and the inner peripheral surface constitutes the seal surface. The female screw portion 38c is a female screw having a diameter smaller than the inner diameter of the seal portion 38b.

The recess 38d is provided in a part of the seat surface 38a in the circumferential direction. The recess 38d has an inclined surface in which both ends in the circumferential direction are inclined with respect to the circumferential direction.

The plug 39 has a head portion 39a, a cylindrical middle portion 39b provided on the head portion 39a, a male screw portion 39c provided at the tip of the middle portion 39b, and a seal formed on the outer peripheral surface of the middle portion 39b. It has a groove 39d, an O-ring 39e provided in the seal groove 39d, a protrusion 39f formed in the head portion 39a, and a clip 52 provided in the head portion 39a. The plug 39 is formed by integrally molding a head portion 39a having a protrusion 39f, an intermediate portion 39b having a seal groove 39d, a male screw portion 39c, and a clip 52 using a resin material.

The end surface of the head portion 39a on the male screw portion 39c side comes into contact with the seat surface 38a. The head portion 39a is configured so that the plug 39 can be screwed into the supply hole 38 by being operated by using a tool or the like.

The midway portion 39b faces the seal portion 38b when the plug 39 is arranged in the supply hole 38. The male screw portion 39c is screwed with the female screw portion 38c. The seal groove 39d is provided substantially in the center of the middle portion 39b. The O-ring 39e is arranged in the seal groove 39d. The O-ring 39e is in close contact with the inner peripheral surface of the seal portion 38b to seal between the seal portion 38b and the intermediate portion 39b. The protrusion 39f is provided on the end surface of the head portion 39a on the male screw portion 39c side, and has an inclined surface in which both ends in the circumferential direction are inclined with respect to the circumferential direction.

The protrusion 39f engages with the recess 38d when the plug 39 is screwed into the supply hole 38 and the head portion 39a comes into contact with the seat surface 38a. In other words, the female screw portion 38c and the male screw portion 39c are adjusted and formed so that the protrusion 39f engages with the recess 38d when the head portion 39a and the seat surface 38a come into contact with each other.

The seal member 13 is provided between the motor casing and the casing cover 24, and is configured so that the rotary shaft 21 and the casing cover 24 can be shaft-sealed. The seal member 13 is, for example, a mechanical seal. The seal member 13 is housed in a seal chamber 25 composed of a motor casing and a casing cover 24. The seal chamber 25 is filled with a lubricant through the supply hole 38.

A plurality of float switches 14, for example, two are provided. The float switch 14 is connected to a cable 41, a float 42 provided at one end of the cable 41, a switch provided inside the float switch 14 that can be switched by the inclination angle of the float switch 14, and the other end of the cable 41. It has a connector and. Further, in the float switch 14, a support tool 51, which will be described later, of the cable support structure 15 is integrally fixed at a predetermined position of the cable 41. Here, the predetermined position is a portion supported by the cable support structure 15 and is a position having a predetermined length from the float switch 14.

The cable 41 includes a conductor wire and a covering member that covers the conductor wire. The cable 41 has a circular cross-sectional shape. A float 42 is fixed to one end of the cable 41, and a switch is electrically connected to the cable 41. A connector is connected to the other end of the cable 41. The cable 41 is connected to the electrical component 16 via the connector.

As shown in FIGS. 1 to 4, the cable support structure 15 includes a support 51, a clip 52, and a support member 53. Also, the cable support structure 15 includes a plug 39 with a clip 52. The cable support structure 15 is configured to be able to support the cables 41 of the plurality of float switches 14.

The support 51 is fixed at a predetermined position of the cable 41. The support 51 is provided with a columnar supported portion and a pair of flanges provided at both ends of the supported portion in the axial direction and having an outer shape larger in the radial direction of the supported portion than the outer diameter of the supported portion. , With a cable boot provided on one flange. The support 51 is made of a resin material by integrally molding a supported portion, a pair of flanges, and a cable boot. The support 51 is integrally molded with the cable 41 in advance, or is integrally fixed to the cable 41. In this case, the support 51 is fixed to the cable 41, for example, by heat shrinkage or by an adhesive.

The flange is configured in a disk shape having an outer diameter larger than the outer diameter of the supported portion. The cable boot is integrally provided with the flange arranged on the float 42 side of the cable 41. The cable boot is configured in a truncated cone shape, for example, protruding from the flange side at a predetermined length. The cable boot is configured to be able to bend while supporting the cable 41 by providing a recess and a hole in the outer peripheral surface thereof.

The clip 52 is configured to be able to support the supported portion. The clip 52 has a radius of curvature in which the supported portion can be arranged inside, and is configured in an arcuate cylinder shape in which a part thereof opens with a width smaller than the outer diameter of the supported portion. The clip 52 is configured such that the axial width of the opening end is larger than the axial width of the supported portion. The clip 52 is configured such that the axial width of the portion located between the ends is the same as the axial width of the supported portion.

More specifically, the clip 52 includes an arcuate portion 52a that is partially open and a pair of lips 52b provided at the open end of the arcuate portion 52a. The axial width of the arcuate portion 52a is configured to be the same as the axial width of the supported portion. The arc-shaped portion 52a is configured such that the opening width is smaller than the outer diameter of the supported portion. For example, the opening width of the arcuate portion 52a is configured to be slightly smaller than the outer diameter of the supported portion. Further, the radius of curvature of the arcuate portion 52a is configured to be slightly larger than the radius of the supported portion.

The lip 52b extends, for example, along the radial direction of the arcuate portion 52a from the opening end of the arcuate portion 52a. The pair of lips 52b spread outward from the opening end of the arcuate portion 52a in a direction away from each other.

Further, the clip 52 provided on the plug 39 is located at the upper end portion of the plug 39 when the plug 39 is attached to the supply hole 38.

The support member 53 includes a base 61 fixed to the motor casing or the electrical component 16, and a unidirectionally long rod 62 fixed to the base 61. The support member 53 includes a plurality of clips 52 fixed to the rod 62.

The base portion 61 is provided in a direction that intersects the hole portion 61a through which the rod 62 whose axial direction is arranged in the gravitational direction can be inserted and the hole portion 61a in the axial direction when the base portion 61 is fixed to the motor casing or the like. It is provided with a screw hole 61b and a set screw 61c, which is a so-called hollow set or a set screw screwed into the screw hole 61b. The set screw 61c is configured to be able to fix the rod 62 inserted in the hole portion 61a by screwing it into the screw hole 61b.

One end side of the rod 62 is fixed to the base portion 61, and a plurality of, for example, three clips 52 are integrally provided on the other end side of the rod 62. The three clips 52 provided on the rod 62 are arranged at equal intervals. The rod 62 is fixed to the hole 61a so that the axial direction of the arcuate portion 52a of the clip 52 is along the radial direction of the motor casing, for example. The height of the rod 62 from the base 61 to the clip 52 is adjusted by changing the position where the rod 62 is fixed by the set screw 61c. The rod 62 has a display unit 62a composed of a plurality of memories and lines indicating the height position of the rod 62 at a portion fixed to the base portion 61.

The electrical component 16 includes a cover 71, a control panel 73 arranged in the cover 71, and a power cable 72 connected to the control panel 73 and the motor 11.

The cover 71 has a pair of fixing portions 71a in which one end is closed and the power cable 72 and the cable 41 of the float switch 14 are inserted and fixed respectively. The pair of fixing portions 71a is the upper surface of the cover 71, and includes, for example, an opening provided at a symmetrical position and a support 71b inserted into the opening and supporting the cables 41 and 72 in a liquid-tight manner. There is. The cover 71 is made of, for example, a resin material.

The control panel 73 is configured to be able to drive the motor 11 at a predetermined rotation speed based on the ON / OFF of the float switch 14. For example, in the control panel 73, when the float switch 14 at the second highest position in the height direction, in other words, the float switch 14 at the lowest position is turned on, and the float switch 14 at the highest position is turned on, the control panel 73 is turned on. The motor 11 can be driven at a predetermined rotation speed. Further, the control panel 73 is configured to be able to stop the motor 11 when the float switch 14 at the lowest position in the height direction is turned off during the driving of the motor 11.

According to the pump device 1 having the sealing structure 2 configured in this way, the O-ring 39e provided in the plug 39 which is the fastening member to be fastened to the supply hole 38 which is the fastened member is provided on the outer periphery of the middle portion 39b of the plug 39. It is configured to be provided in the seal groove 39d provided on the surface. With this configuration, the O-ring 39e is crushed by being pressed in the radial direction between the seal portion 38b and the seal groove 39d, so that the plug 39 screwed into the supply hole 38 is subjected to axial stress by the O-ring 39e. It can be prevented from being applied. As a result, since it is possible to prevent an excessive stress in the axial direction from being applied to the male screw portion 39c, a resin material having a lower strength than the metal material and being inexpensive can be adopted as the material of the plug 39. As a result, the manufacturing cost of the pump device 1 and the sealed structure 2 can be reduced.

Further, by providing a recess 38d on the seat surface 38a of the supply hole 38 and providing a protrusion 39f that engages with the recess 38d on the end surface of the head portion 39a of the plug 39, the operator clicks when the recess 38d and the protrusion 39f are engaged. It is possible to give a feeling, and it is possible to prevent the plug 39 from being damaged due to overtightening of the plug 39. Further, by forming the female screw portion 38c and the male screw portion 39c so that the recess 38d and the protrusion 39f engage with each other when the head portion 39a abuts on the seat surface 38a, the clip 52 provided on the plug 39 can be provided. It can always be placed at the upper end of the plug 39. As a result, the position of the float switch 14 fixed to the clip 52 is determined, and the float switch 14 is turned ON / OFF by a predetermined water level, so that the pump device 1 can be controlled with high accuracy.

As described above, according to the pump device 1 and the sealed structure 2 according to the embodiment of the present invention, it can be manufactured at low cost.

The present invention is not limited to the above embodiment. For example, in the above-mentioned example, the configuration in which the sealing structure 2 is provided in the pump device 1 has been described, but the present invention is not limited to this, and the sealing groove 39d provided with the fastened member 2A communicating the internal space and the external space on the outer peripheral surface is provided. It can be applied to other configurations as long as it is sealed with the fastening member 2B.

That is, the present invention is not limited to the above embodiment, and can be variously modified at the implementation stage without departing from the gist thereof. In addition, each embodiment may be carried out in combination as appropriate, in which case the combined effect can be obtained. Further, the above-described embodiment includes various inventions, and various inventions can be extracted by a combination selected from a plurality of disclosed constituent requirements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, if the problem can be solved and the effect is obtained, the configuration in which the constituent elements are deleted can be extracted as an invention.
The following is a description equivalent to the invention described in the claims of the original application of the present application.
[1] The head portion, the cylindrical middle portion provided in the head portion, the male screw portion provided at the tip of the middle portion, the seal groove provided on the outer peripheral surface of the middle portion, and the seal groove. Fastening member with O-ring and
A seat surface that abuts on the head portion, a seal portion that opens in the center of the seat surface and faces the middle portion, and a fastened member having a female screw portion that is continuously provided on the seal portion.
With a sealed structure.
[2] The fastening member has an engaging portion on a surface of the head portion facing the seat surface.
The sealed structure according to [1], wherein the engaged member has an engaged portion that engages with the engaging portion of the head portion on the seat surface.
[3] The engaging portion is a protrusion and is
The sealing structure according to [2], wherein the fastened member is a recess larger than the protrusion.
[4] The sealing structure according to [3], wherein both ends of the protrusion and the recess are inclined with respect to the circumferential direction.
[5] The sealing structure according to [1], wherein the fastening member is made of a resin material.
[6] Lubricating the seal chamber having a seal chamber for accommodating a mechanical seal, a seat surface, a seal portion opening in the center of the seat surface, and a female screw portion continuously provided in the seal portion. A pump with a member to be fastened to supply the agent,
With the motor fixed to the top of the pump,
An electrical component provided on the upper part of the motor and
A support having a cable having one end connected to the electrical component, a pair of flanges provided on the cable, a columnar supported portion provided between the pair of flanges, and a cable boot provided on one of the flanges. A float switch provided with a tool and a float provided at the other end of the cable, and a float switch.
A head portion facing the seat surface, a cylindrical middle portion provided on the head portion facing the seal portion, a male screw portion provided at the tip of the middle portion, and an outer peripheral surface of the middle portion. A plug having a seal groove and an O-ring provided in the seal groove, and a fastening member having a clip for supporting the supported portion integrally provided in the plug.
A pump device equipped with.
[7] The fastening member has an engaging portion on a surface of the head portion facing the seat surface.
The pump device according to [6], wherein the engaged member has an engaged portion that engages with the engaging portion of the head portion on the seat surface.
[8] The engaging portion is a protrusion and is
The pump device according to [7], wherein the fastened member is a recess larger than the protrusion.
[9] The pump device according to [8], wherein both ends of the protrusion and the recess are inclined with respect to the circumferential direction.
[10] The pump device according to [6], wherein the fastening member is made of a resin material.

1 ... Pump device, 2 ... Sealed structure, 2A ... Fastened member, 2B ... Fastened member, 11 ... Motor, 12 ... Pump, 13 ... Seal member, 14 ... Float switch, 15 ... Cable support structure, 16 ... Electrical component, 21 ... Rotating shaft, 22 ... Impeller, 23 ... Pump casing, 24 ... Casing cover, 25 ... Seal chamber, 31 ... Suction port, 32 ... Discharge port, 33 ... Pump chamber, 34 ... Opening, 35 ... Mounting surface, 37 ... Leg, 38 ... Supply hole, 38a ... Seat, 38b ... Seal, 38c ... Female screw, 38d ... Recess, 39 ... Plug, 39a ... Head, 39b ... Midway, 39c ... Male screw, 39d ... Seal groove, 39e ... O-ring, 39f ... Protrusion, 41 ... Cable, 42 ... Float, 51 ... Support, 52 ... Clip, 52a ... Arc-shaped part, 52b ... Lip, 53 ... Support member, 61 ... Base, 61a ... hole, 61b ... screw hole, 61c ... set screw, 62 ... rod, 62a ... display, 71 ... cover, 71a ... fixed part, 71b ... support, 72 ... power cable, 73 ... control panel.

Claims (10)

The columnar supported portion and the supported portion are provided at both ends in the axial direction, respectively, and are provided on one of a pair of flanges and the pair of flanges, which are larger in the radial direction of the supported portion than the outer diameter of the supported portion. Supports provided on the cable with cable boots,
A head portion, a cylindrical middle portion provided in the head portion, a male screw portion provided at the tip of the middle portion, a seal groove provided on the outer peripheral surface of the middle portion, and an O-ring provided in the seal groove. A fastening member having a plug and a clip for supporting the supported portion integrally provided with the plug, and a fastening member.
A seat surface that abuts on the head portion, a seal portion that opens in the center of the seat surface and faces the middle portion, and a fastened member having a female screw portion that is continuously provided on the seal portion.
With a sealed structure. The fastening member has an engaging portion on a surface of the head portion facing the seat surface.
The sealing structure according to claim 1, wherein the engaged member has an engaged portion that engages with the engaging portion of the head portion on the seat surface. The engaging portion is a protrusion and
The sealing structure according to claim 2, wherein the engaged portion is a recess larger than the protrusion. The seat surface is formed in an annular shape and has an annular shape.
In the recess, both ends of the bearing surface in the circumferential direction are inclined with respect to the circumferential direction.
The sealing structure according to claim 3 , wherein the protrusions have both ends in the circumferential direction inclined with respect to the circumferential direction . The sealing structure according to any one of claims 1 to 4, wherein the fastening member is made of a resin material. Lubricant is supplied to the seal chamber having a seal chamber for accommodating the mechanical seal, a seat surface, a seal portion opening in the center of the seat surface, and a female screw portion continuously provided in the seal portion. With a pump having a member to be fastened
With the motor fixed to the top of the pump,
An electrical component provided on the upper part of the motor and
A pair of cables, one end of which is connected to the electrical component , a columnar supported portion, and both ends of the supported portion in the axial direction, which are larger in the radial direction of the supported portion than the outer diameter of the supported portion. A float switch comprising a support provided on the cable having a cable boot provided on one of the flanges and the pair of flanges and a float provided on the other end of the cable.
A head portion facing the seat surface, a cylindrical middle portion provided on the head portion facing the seal portion, a male screw portion provided at the tip of the middle portion, and an outer peripheral surface of the middle portion. A plug having a seal groove and an O-ring provided in the seal groove, and a fastening member having a clip for supporting the supported portion integrally provided in the plug.
A pump device equipped with. The fastening member has an engaging portion on a surface of the head portion facing the seat surface.
The pump device according to claim 6, wherein the engaged member has an engaged portion that engages with the engaging portion of the head portion on the seat surface. The engaging portion is a protrusion and
The pump device according to claim 7, wherein the engaged portion is a recess larger than the protrusion. The seat surface is formed in an annular shape and has an annular shape.
In the recess, both ends of the bearing surface in the circumferential direction are inclined with respect to the circumferential direction.
The pump device according to claim 8 , wherein the protrusions are inclined at both ends in the circumferential direction with respect to the circumferential direction . The pump device according to any one of claims 6 to 9, wherein the fastening member is made of a resin material.

Images