JP2007327432A - Mechanical pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mechanical pump capable of suppressing the lowering of the seal effect of a mechanical seal. <P>SOLUTION: This mechanical pump comprises a mechanical seal 6 having a rotation side support member 61 rotating integrally with a shaft 2 rotatably supported on a casing 1, an annular rotation side seal member 66 supported by the rotation side support member 61, a fixed side support member 62 fixed to the casing 1, and an annular fixed side seal member 63 supported by the fixed side support member 62 and sealing cooling water at the sliding part between the rotation side seal member 66 and the fixed side seal member 63. In the mechanical pump, the center axis C1 of the fixed side seal member 63 is parallel with the center axis C of the rotation side seal member 66 in non-driving and the center axis C1 of the fixed side seal member 63 is biased in the eccentric direction D of a shaft 2 in driving to the center axis C of the rotation side seal member 66 in non-driving. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mechanical pump having a mechanical seal.

There is a mechanical pump that is driven by an external drive source and discharges liquid, such as a water pump that is rotationally driven by a crankshaft of an internal combustion engine (see, for example, Patent Document 1).
FIG. 5 shows a cross-sectional structure of a conventional general internal combustion engine water pump including the one described in Patent Document 1, and FIG. 6 shows a planar structure when the water pump is viewed from the direction A in FIG. ing.

  As shown in FIG. 5, the water pump includes a casing 101, a shaft 2 rotatably supported inside the casing 101, a pulley 3 attached to one end of the shaft 2, and an impeller attached to the other end of the shaft 2. 4 is provided. A ball bearing 5 is disposed between the casing 101 and the shaft 2, and the shaft 2 is rotatably supported by the ball bearing 5. Further, as shown in FIG. 6, the impeller 4 is accommodated in a vortex chamber 14 formed inside the casing 101. When the shaft 2 is rotationally driven by the crankshaft, the impeller 4 rotates together with the shaft 2 and a circumferential flow is formed in the vortex chamber 14. As a result, the cooling water is discharged from a discharge port (not shown) and supplied to the internal combustion engine.

  Here, as shown in FIG. 5, a gap between the casing 101 and the shaft 2 is sealed between the ball bearing 5 and the impeller 4 in the axial direction of the shaft 2, so that the cooling water flows from the impeller 4 side to the ball bearing. A mechanical seal 106 for preventing entry into the 5 side is provided.

  The mechanical seal 106 includes a rotation-side support member 61 having a substantially cylindrical shape that is press-fitted to the outer peripheral surface of the shaft 2, and a fixed-side support member having a substantially cylindrical shape that is press-fitted to the inner peripheral surface of the casing 101. 62. A fixed-side seal member 63 is fitted to the fixed-side support member 62. Further, the fixed side support member 62 is provided with a packing 64 and a spring 65 at a position adjacent to the fixed side seal member 63. On the other hand, the rotation-side support member 61 is provided with a rotation-side seal member 66 via a buffer rubber 67. The fixed-side seal member 63 is pressed against the rotation-side seal member 66 by the urging force of the spring 65, and the pressing force is received by the buffer rubber 67.

In such a configuration, when the shaft 2 is rotated based on the rotation of the crankshaft, the seal surface 66F of the rotation-side seal member 66 is slid and rotated while being pressed by the seal surface 63F of the fixed-side seal member 63. The gap with the shaft 2 is sealed.
Japanese Patent Laid-Open No. 9-79182

  By the way, each part which comprises a pump has the dispersion | variation between individuals at the time of manufacture, and an assembly error arises when such each part is assembled | attached. Further, in the water pump shown in FIGS. 5 and 6, as shown in each drawing, the shaft 2 is subjected to the belt load Fb via the pulley 3, and as shown in FIG. Since a force based on the pressure Pw of the cooling water flowing through the vicinity of the suction port 14A in the vortex chamber 14 acts on the shaft 2, a force that shifts or tilts the central axis C acts on the shaft 2. As a result, the center axis of the rotation-side seal member 66 and the center axis of the fixed-side seal member 63 are shifted so that the contact state between the rotation-side seal member 66 and the fixed-side seal member 63 is deteriorated. May decrease and water leakage may occur. Such an inconvenience is not limited to the water pump of the internal combustion engine, but may also occur in a mechanical pump that sucks and discharges liquid, and in a mechanical pump that suppresses leakage of the liquid by a mechanical seal. .

  This invention is made | formed in view of such a situation, The objective is to provide the mechanical pump which can suppress the fall of the sealing effect of a mechanical seal.

Hereinafter, means for solving the above-described object and its operation and effects will be described.
According to a first aspect of the present invention, there is provided a rotary side support member that rotates integrally with a shaft rotatably supported by a casing, a rotary side seal member that is formed in an annular shape and supported by the rotary side support member, A fixed side support member fixed to the casing; and a fixed side seal member formed in an annular shape and supported by the fixed side support member. A sliding portion between the rotation side seal member and the fixed side seal member In the mechanical pump having a mechanical seal that seals the liquid, a central axis of the fixed-side seal member is parallel to a central axis of the rotary-side seal member when not driven, and a central axis of the fixed-side seal member The gist is that it is biased in the eccentric direction of the shaft during driving with respect to the central axis of the rotation-side seal member during non-driving. To.

  According to the above configuration, the rotation-side seal member is supported by the rotation-side support member that rotates integrally with the shaft, and thus rotates with the rotation of the shaft. Further, since the fixed-side seal member is supported by the fixed-side support member fixed to the casing, the fixed-side seal member is stopped regardless of the rotation of the shaft. And a mechanical seal seals a liquid in the sliding part of the rotation side seal member and fixed side seal member which rotate relatively.

  Here, according to the above configuration, the central axis of the fixed-side seal member is parallel to the central axis of the rotating-side seal member when not driven, and the central axis of the fixed-side seal member is the rotating-side seal member when not driven It is biased in the eccentric direction of the shaft during driving with respect to the central axis of the shaft. For this reason, the fixed-side seal member and the rotary-side seal member are displaced from appropriate positions when not driven, but the fixed-side seal portion and the rotary-side seal portion are positioned at appropriate positions due to the shaft being eccentric when driven. Will slide. As a result, a reduction in the sealing effect of the mechanical seal can be suppressed.

  Specifically, as described in claim 2, the shaft is rotatably supported by the casing via a bearing fixed to the casing, and the central axis of the fixed-side seal member is the center of the bearing. It is possible to adopt a configuration in which the center axis of the fixed-side seal member is deviated in the eccentric direction of the shaft during driving with respect to the center axis of the bearing.

  According to a third aspect of the present invention, there is provided a rotary side support member that rotates integrally with a shaft that is rotatably supported by a casing, a rotary side seal member that is formed in an annular shape and supported by the rotary side support member, A fixed side support member fixed to the casing; and a fixed side seal member formed in an annular shape and supported by the fixed side support member. A sliding portion between the rotation side seal member and the fixed side seal member In the mechanical pump having a mechanical seal that seals the liquid at the center, the center axis of the fixed-side seal member is inclined in the tilt direction of the shaft during driving with respect to the center axis of the rotating-side seal member during non-driving. The gist of this is

  According to the above configuration, since the central axis of the fixed-side seal member is inclined in the tilt direction of the shaft during driving with respect to the central axis of the rotary-side seal member during non-driving, Although the rotation-side seal member is displaced from an appropriate position, the shaft is inclined during driving, so that the fixed-side seal portion and the rotation-side seal portion slide at an appropriate position. As a result, a reduction in the sealing effect of the mechanical seal can be suppressed.

  Specifically, as described in claim 4, the shaft is rotatably supported by the casing via a bearing fixed to the casing, and the central axis of the fixed-side seal member is the bearing shaft. A configuration in which the shaft is tilted in the tilt direction during driving with respect to the central axis can be employed.

  When a driving force is input to the shaft via the belt or chain, a belt load acts on the shaft, and therefore a force that shifts or tilts the central axis of the shaft acts on the shaft.

  In this respect, according to the invention described in claim 5, when the central axis of the shaft is displaced or inclined due to the belt load, the fixed-side seal portion and the rotation-side seal portion slide at appropriate positions. Therefore, a reduction in the sealing effect of the mechanical seal can be suppressed.

<First Embodiment>
Hereinafter, a first embodiment of a mechanical pump according to the present invention will be described with reference to FIGS. 1 and 2. In this embodiment, a water pump that is rotationally driven based on the rotation of the crankshaft of the internal combustion engine is exemplified as the mechanical pump.

FIG. 1 is a sectional view of a water pump in the present embodiment.
As shown in FIG. 1, the water pump includes a casing 1, a suction cover 10, and a gasket 11 interposed between the casing 1 and the suction cover 10, and the casing 1, the suction cover 10, and The gasket 11 forms a water pump housing. A suction port 12 through which cooling water is sucked is formed inside the suction cover 10.

Inside the casing 1, there is provided a shaft 2 having a substantially cylindrical large-diameter portion 21 and a small-diameter portion 22 that is smaller in diameter than the large-diameter portion 21.
A pulley seat 30 is attached to the end of the shaft 2 on the large diameter portion 21 side (left end in FIG. 1), and the rotational driving force of the crankshaft of the internal combustion engine is attached to the pulley seat 30 via a belt. A pulley 3 for inputting to 2 is attached.

An impeller 4 is attached to an end portion (right end in FIG. 1) of the shaft 2 on the small diameter portion 22 side, and the impeller 4 can rotate integrally with the shaft 2.
A ball bearing 5 is disposed between the casing 1 and the large diameter portion 21 of the shaft 2, and the shaft 2 is rotatably supported by the ball bearing 5. The ball bearing 5 is fitted into the inner peripheral surface of the casing 1 and forms the outer ring portion of the ball bearing 5, and the circumferential direction of the shaft 2 between the cylindrical member 50 and the large-diameter portion 21 of the shaft 2. Are provided with a plurality of balls 51A and 51B arranged at equal intervals. In the water pump of this embodiment, the large diameter portion 21 of the shaft 2 also serves as the inner ring portion of the ball bearing 5.

  The small-diameter portion 22 of the shaft 2 is provided with a mechanical seal 6 for sealing the gap between the casing 1 and the small-diameter portion 22 and preventing cooling water from entering the ball bearing 5 side from the impeller 4 side. Yes.

  The mechanical seal 6 includes a rotation-side support member 61 that rotates integrally with the shaft 2, a rotation-side seal member 66 that is supported by the rotation-side support member 61, a fixed-side support member 62 that is fixed to the casing 1, and a fixed-side support member 62. The fixed-side seal member 63 supported by is provided.

  The rotation-side support member 61 has a substantially cylindrical shape that is press-fitted to the small diameter portion 22 of the shaft 2, and a substantially cylindrical shape that is press-fitted to the inner peripheral surface of the casing 1. A support member 62 is provided. A fixed-side seal member 63 is fitted to the fixed-side support member 62. Further, the fixed side support member 62 is provided with a packing 64 and a spring 65 at a position adjacent to the fixed side seal member 63. On the other hand, the rotation-side support member 61 is provided with a rotation-side seal member 66 via a buffer rubber 67. The fixed-side seal member 63 is pressed against the rotation-side seal member 66 by the urging force of the spring 65, and the pressing force is received by the buffer rubber 67.

  In such a configuration, when the shaft 2 rotates based on the rotation of the crankshaft, the seal surface 66F of the rotation-side seal member 66 is slid and rotated while being pressed by the seal surface 63F of the fixed-side seal member 63. The gap with the shaft 2 is sealed.

  By the way, it has been described above that each part constituting the water pump has a variation among individuals at the time of manufacture, and an assembly error occurs when these parts are assembled. It has also been described above that a belt load Fb acts on the shaft 2 via the pulley 3 and that a force based on the pressure Pw of the cooling water flowing in the vicinity of the suction port in the vortex chamber 14 acts on the shaft 2. .

  In the present embodiment, the center axis C1 of the fixed-side seal member 63 is parallel to the center axis C of the ball bearing 5, and the center axis C1 of the fixed-side seal member 63 is driven with respect to the center axis C of the ball bearing 5. The inner peripheral surface of the casing 1 is formed so as to be biased in the eccentric direction D of the shaft 2 at. That is, the central axis C1 of the fixed-side seal member 63 is parallel to the central axis C of the rotation-side seal member 66 when not driven, and the center axis C1 of the fixed-side seal member 63 is the rotation-side seal member when not driven. The shaft 66 is offset in the eccentric direction D of the shaft during driving. Here, the eccentric direction D and the amount of deviation in the eccentric direction D are determined by experiments.

Next, the operation of the water pump according to the present embodiment will be described with reference to FIG. 2 and compared with the operation of the conventional water pump.
In FIG. 2A, a force based on the belt load Fb and the pressure Pw of the cooling water flowing through the vicinity of the suction port 14A in the vortex chamber 14 acts on the shaft 2 (see FIG. 5) of the conventional water pump. The state of the shaft 2, the fixed-side seal member 63, and the rotation-side seal member 66 during operation (during driving) is indicated by solid lines. Further, in FIG. 2A, as a comparison object, a state when the belt load Fb or the like is not acting (during non-driving) is indicated by a broken line. On the other hand, FIG. 2B shows the case where a force based on the belt load Fb and the pressure Pw of the cooling water flowing in the vicinity of the suction port in the vortex chamber 14 acts on the shaft 2 of the water pump in this embodiment. The states of the shaft 2, the fixed-side seal member 63, and the rotation-side seal member 66 during driving are indicated by solid lines. Further, in FIG. 2B, as a comparison target, the state when the belt load Fb or the like is not acting (during non-driving) is indicated by a broken line.

  In the conventional water pump, the inner peripheral surface of the casing 101 is formed so that the central axis C1 of the fixed-side seal member 63 coincides with the central axis C of the ball bearing 5 (the central axis C of the shaft 2 when not driven). Yes. Therefore, as shown in FIG. 2A, when a force or the like based on the belt load Fb and the cooling water pressure Pw acts on the shaft 2, the central axis C of the shaft 2 (the center of the rotation-side seal member 66). The axis C) is eccentric and becomes the central axis Cd. Here, one end of the fixed-side seal member 63 is fixed to the packing 64 and has a degree of freedom in the axial direction and the radial direction. Therefore, the fixed-side seal member 63 rotates with the eccentricity of the shaft 2. 66. As a result, the contact state between the rotation-side seal member 66 and the fixed-side seal member 63 is deteriorated.

On the other hand, in the water pump in the present embodiment, the center axis C1 of the fixed-side seal member 63 is parallel to the center axis C of the ball bearing 5 and the center axis C1 of the fixed-side seal member 63 is the ball bearing 5. The inner peripheral surface of the casing 1 is formed so as to be deviated in the eccentric direction D of the shaft 2 during driving with respect to the central axis C (center axis C of the shaft 2 when not driven). For this reason, as shown in FIG. 2B, when the force based on the belt load Fb and the pressure Pw of the cooling water is not applied to the shaft 2, the rotation side seal member 66 and the fixed side seal member 63 are used. The contact state will be worse than that of the conventional water pump. However, when a force or the like based on the belt load Fb and the cooling water pressure Pw is applied to the shaft 2, the central axis C of the shaft 2 (the central axis C of the rotation-side seal member 66) is eccentric and the central axis By matching with C1, the contact state between the rotation-side seal member 66 and the fixed-side seal member 63 becomes normal.
<Effect of embodiment>
According to the embodiment described above, the following effects can be obtained.

  (1) Since the rotation-side seal member 66 is supported by the rotation-side support member 61 that rotates integrally with the shaft 2, the rotation-side seal member 66 rotates with the rotation of the shaft 2. Further, since the fixed-side seal member 63 is supported by the fixed-side support member 62 fixed to the casing 1, the fixed-side seal member 63 stops regardless of the rotation of the shaft 2. The mechanical seal 6 seals the cooling water at the sliding portion between the rotating side sealing member 66 and the stationary side sealing member 63 that rotate relative to each other.

Here, according to the present embodiment, the central axis C1 of the fixed-side seal member 63 is parallel to the central axis C of the ball bearing 5, and the central axis C1 of the fixed-side seal member 63 is the central axis C of the ball bearing 5. On the other hand, the inner peripheral surface of the casing 1 is formed so as to be biased in the eccentric direction D of the shaft 2 during driving. That is, the central axis C1 of the fixed-side seal member 63 is parallel to the central axis C of the rotation-side seal member 66 when not driven, and the center axis C1 of the fixed-side seal member 63 is the rotation-side seal member 66 when not driven. The shaft 2 is biased in the eccentric direction D of the shaft 2 during driving. For this reason, the fixed-side seal member 63 and the rotation-side seal member 66 are displaced from appropriate positions when not driven, but the shaft 2 is decentered during the drive so that the fixed-side seal member 63 and the rotation-side seal member 66 are Will slide at an appropriate position. As a result, a reduction in the sealing effect of the mechanical seal 6 can be suppressed.
Second Embodiment
A second embodiment of the mechanical pump according to the present invention will be described with reference to FIGS. In the present embodiment, the center axis of the fixed-side seal member is inclined in the tilt direction of the shaft during driving with respect to the center axis of the rotation-side seal member in the non-drive shaft. Is different. The same configurations as those in the first embodiment are given the same reference numerals. Hereinafter, the difference from the first embodiment will be mainly described.

FIG. 3 is a cross-sectional view of the water pump in the present embodiment.
As shown in FIG. 3, in the present embodiment, the casing 201 is arranged such that the center axis C <b> 2 of the fixed-side seal member 63 is tilted in the tilt direction E of the shaft 2 during driving with respect to the center axis C of the ball bearing 5. An inner peripheral surface is formed. That is, the center axis C2 of the fixed-side seal member 63 is inclined in the tilt direction E of the shaft 2 during driving with respect to the center axis C of the rotation-side sealing member 66 when not driving. Here, the inclination direction E is determined by experiments.

Next, the operation of the water pump according to the present embodiment will be described with reference to FIG. 4 while comparing with the operation of the conventional water pump.
In FIG. 4A, a force based on the belt load Fb and the pressure Pw of the cooling water flowing through the vicinity of the suction port 14A in the vortex chamber 14 acts on the shaft 2 (see FIG. 5) of the conventional water pump. The state of the shaft 2, the fixed-side seal member 63, and the rotation-side seal member 66 during operation (during driving) is indicated by solid lines. Further, in FIG. 4B, as a comparison object, a state when the belt load Fb or the like is not acting (during non-driving) is indicated by a broken line. On the other hand, FIG. 4A shows a case where a force or the like based on the belt load Fb and the pressure Pw of the cooling water flowing through the vortex chamber 14 is acting on the shaft 2 of the water pump in the present embodiment (during driving). The states of the shaft 2, the stationary seal member 63 and the rotary seal member 66 are shown by solid lines. Further, in FIG. 4B, as a comparison object, a state when the belt load Fb or the like is not acting (during non-driving) is indicated by a broken line.

  In the conventional water pump, the inner peripheral surface of the casing 1 is formed so that the central axis C2 of the fixed-side seal member 63 coincides with the central axis C of the ball bearing 5 (the central axis C of the shaft 2 when not driven). Yes. Therefore, as shown in FIG. 4A, when a force or the like based on the belt load Fb and the cooling water pressure Pw acts on the shaft 2, the central axis C of the shaft 2 (the center of the rotation-side seal member 66). The axis C) is eccentric and becomes the central axis Cd. Here, since the fixed-side seal member 63 is fixed to the packing 64 and has a degree of freedom in the axial direction and the radial direction, the fixed-side seal member 63 is attached to the rotary-side seal member 66 as the shaft 2 is eccentric. It will lean against it. As a result, the contact state between the rotation-side seal member 66 and the fixed-side seal member 63 is deteriorated.

On the other hand, in the water pump in the present embodiment, the central axis C2 of the fixed-side seal member 63 is the shaft 2 when driven relative to the central axis C of the ball bearing 5 (the central axis C of the shaft 2 when not driven). The inner peripheral surface of the casing 201 is formed so as to be inclined in the inclination direction E. For this reason, as shown in FIG. 4B, when a force based on the belt load Fb and the pressure Pw of the cooling water is not applied to the shaft 2, the rotary side seal member as compared with the conventional water pump. The contact state between 66 and the fixed-side seal member 63 will deteriorate. However, when the belt load Fb, the cooling water pressure Pw, etc. are acting on the shaft 2, the central axis C of the shaft 2 (the central axis C of the rotation-side seal member 66) is eccentric and coincides with the central axis C2. By doing so, the contact state between the rotation-side seal member 66 and the fixed-side seal member 63 becomes normal.
<Effect of embodiment>
According to the embodiment described above, the following effects can be obtained.

  (1) Since the rotation-side seal member 66 is supported by the rotation-side support member 61 that rotates integrally with the shaft 2, the rotation-side seal member 66 rotates with the rotation of the shaft 2. Further, since the fixed-side seal member 63 is supported by the fixed-side support member 62 fixed to the casing 201, the fixed-side seal member 63 stops regardless of the rotation of the shaft 2. The mechanical seal 206 seals the cooling water at the sliding portion between the rotation-side seal member 66 and the stationary-side seal member 63 that rotate relative to each other.

  Here, according to the present embodiment, the central axis C2 of the fixed-side seal member 63 is inclined with respect to the central axis C of the ball bearing 5 in the inclination direction E of the shaft 2 during driving. That is, since the center axis C2 of the fixed-side seal member 63 is inclined in the tilt direction E of the shaft 2 during driving with respect to the center axis C of the rotating-side seal member 66 when not driven, the fixed-side seal is not driven. The member 63 and the rotation side sealing member 66 will shift | deviate from an appropriate position. However, at the time of driving, the shaft 2 is inclined, so that the fixed-side seal member 63 and the rotation-side seal member 66 slide at appropriate positions. As a result, a decrease in the sealing effect of the mechanical seal 206 can be suppressed.

In addition, the said embodiment can also be implemented with the following forms which changed this suitably.
In the above embodiment, a water pump that is rotationally driven based on the rotation of the crankshaft of the internal combustion engine is employed as the mechanical pump. However, the present invention is not applied only to such a water pump, and has a mechanical seal. Any mechanical pump can be applied to other pumps.

  In the above embodiment, the pulley 3 is employed as a configuration for inputting the rotational driving force of the crankshaft of the internal combustion engine to the shaft 2 via the belt. However, the rotational driving force is applied to the shaft via the chain. In the case of inputting to 2, this may be changed to a sprocket. Further, the configuration for inputting the rotational driving force to the shaft 2 is not limited to the belt, the pulley, the chain, and the sprocket. If the rotational driving force is input to the shaft, the configuration may be changed to another configuration. Good.

  In the above embodiment, the center axis C (center axis C of the ball bearing 5) of the rotation-side seal member 66 when not driven coincides with the center of the mechanical pump, and the center of the rotation-side seal member 66 when not driven The relationship between the central axes C1 and C2 of the fixed-side seal member 63 with respect to the axis C is biased or inclined in the manner described above. However, the relationship between the central axes C1 and C2 of the fixed-side seal member 63 and the central axis C of the rotation-side seal member 66 when not driven is relative. For this reason, for example, the central axes C1 and C2 of the fixed-side seal member 63 are aligned with the center of the mechanical pump, and the central axis of the rotary-side seal member 66 is not driven with respect to the central axes C1 and C2 of the fixed-side seal member 63. The relationship of C may be biased or tilted as described above.

Sectional drawing of the water pump concerning 1st Embodiment of this invention. The schematic diagram which shows the effect | action of the water pump concerning the embodiment. Sectional drawing of the water pump concerning 2nd Embodiment of this invention. The schematic diagram which shows the effect | action of the water pump concerning the embodiment. Sectional drawing of the conventional water pump. The top view of the conventional water pump.

Explanation of symbols

1, 101, 201 ... casing, 10 ... suction cover, 11 ... gasket,
DESCRIPTION OF SYMBOLS 12 ... Suction port, 14 ... Vortex chamber, 14A ... Near suction port, 2 ... Shaft, 21 ... Large diameter part, 22 ... Small diameter part, 3 ... Pulley, 30 ... Pulley seat, 4 ... Impeller, 5 ... Ball bearing, 50 ... Cylindrical member, 51A, 51B ... Ball, 6, 106 ... Mechanical seal, 61 ... Rotation side support member, 62 ... Fixed side support member, 63 ... Fixed side seal member, 63F ... Seal surface, 64 ... Packing, 65 ... Spring , 66... Rotation side seal member, 66 F... Seal surface, 67.

Claims (5)

A rotating side support member that rotates integrally with a shaft rotatably supported by the casing;
A rotation-side seal member formed in an annular shape and supported by the rotation-side support member;
A fixed support member fixed to the casing;
A fixed-side seal member formed in an annular shape and supported by the fixed-side support member,
In a mechanical pump having a mechanical seal that seals liquid at a sliding portion between the rotation-side seal member and the fixed-side seal member,
The center axis of the fixed side seal member is parallel to the center axis of the rotating side seal member when not driven, and the center axis of the fixed side seal member is relative to the center axis of the rotating side seal member when not driven. The mechanical pump is biased in the eccentric direction of the shaft during driving.   The shaft is rotatably supported by the casing via a bearing fixed to the casing, and a central axis of the fixed-side seal member is parallel to a central axis of the bearing, and the fixed side The mechanical pump according to claim 1, wherein a central axis of the seal member is deviated in an eccentric direction of the shaft during driving with respect to a central axis of the bearing. A rotating side support member that rotates integrally with a shaft rotatably supported by the casing;
A rotation-side seal member formed in an annular shape and supported by the rotation-side support member;
A fixed support member fixed to the casing;
A fixed-side seal member formed in an annular shape and supported by the fixed-side support member,
In a mechanical pump having a mechanical seal that seals liquid at a sliding portion between the rotation-side seal member and the fixed-side seal member,
The mechanical pump characterized in that a central axis of the fixed-side seal member is inclined in an inclination direction of the shaft during driving with respect to a central axis of the rotating-side seal member during non-driving.   The shaft is rotatably supported by the casing via a bearing fixed to the casing, and the central axis of the fixed-side seal member is the shaft of the shaft during driving with respect to the central axis of the bearing. The mechanical pump according to claim 3, wherein the mechanical pump is inclined in an inclination direction.   The mechanical pump according to claim 1, wherein a driving force is input to the shaft via a belt or a chain.

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