JP2018035719A - Fluid pressure pump and method of manufacturing fluid pressure pump - Google Patents

Abstract

An object of the present invention is to provide an efficient fluid pressure pump in which a housing is formed by heat welding.
A seal portion S is provided inside a welding position WP where a first housing 1 and a second housing 2 are joined by thermal welding. The seal portion S includes a seal wall 26 formed on one side of the first housing 1 or the second housing 2 and a seal body 29 formed on the other side of the first housing 1 or the second housing 2. Is arranged so as to contact the seal wall 26.
[Selection] Figure 3

Description

  The present invention relates to a technique for improving pump efficiency in a fluid pressure pump in which a first housing made of resin and a second housing made of resin are joined by heat welding to form a housing.

  As a fluid pressure pump, Patent Document 1 discloses that a welding protrusion is formed on a resin casing and a resin separation plate, and a burr scattering prevention wall is formed on the inner side and the outer side of the casing and the separation plate with reference to the welding protrusion. And a technique of spin welding the welding projections.

  In this Patent Document 1, a spin chamber is formed between a casing and a separating plate by spin welding welding projections, an impeller is disposed in the pump chamber, and a magnetic drive unit that drives this is provided. A fluid pressure pump is configured.

  Further, in Patent Document 2, as a fluid pressure pump, a first pressure bonding surface is formed on a first resin member, a second pressure bonding surface is formed on a second resin member, and the first pressure bonding is formed on the first member. A technique in which a peripheral wall is formed in a region surrounding the surface is described.

  In Patent Document 2, a pump chamber is formed by spin welding the first pressure-bonding surface and the second pressure-bonding surface, an impeller is accommodated in the pump chamber, and an electric motor unit that drives the pump chamber is provided. A pump is configured.

JP 2009-221942 A Japanese Unexamined Patent Publication No. 2016-22728

  As in the configurations of Patent Documents 1 and 2, the first housing and the second housing are connected by thermal welding to form a housing, and a fluid pressure pump is configured by providing a rotor inside the housing. A gap is formed at the boundary between the first housing and the second housing on the inner wall surface.

  In the spin welding, the first housing and the second housing are rotated relative to each other, and the weld is formed by frictional heat between the welds in a state where pressure is applied so that the welds formed in a protruding state are pressed against each other. It melts and realizes welding.

  In addition to this spin welding, when performing heat welding, it is necessary to continuously apply pressure to the welded parts until the welding is completed, and therefore the first housing and the second housing are separated from each other except the welded part. Are arranged in a positional relationship. Therefore, when the heat welding is completed, a gap is formed on the inner surface of the pump chamber due to the separation between the first housing and the second housing.

  Thus, in the configuration in which the gap is formed on the inner surface of the pump chamber, for example, a part of the high-pressure fluid created by the rotation of the rotor flows to the inner surface on the low-pressure side of the inner surface of the pump chamber through the gap. As a result, the efficiency of the pump may be reduced. In particular, since a relatively large space is formed in the vicinity of the welding position, in the case where a fluid flows in this space, the efficiency of the pump is greatly reduced.

  For this reason, an efficient fluid pressure pump and a fluid pressure pump manufacturing method are required even if the housing is formed by heat welding.

A feature of the present invention includes a housing in which a first housing made of resin and a second housing made of resin are joined by thermal welding at a welding position, and includes a pump rotor accommodated in the housing,
A seal portion including a thin plate-like seal body and a seal wall with which the seal body contacts is formed on the inner side of the welding position, and the seal body is attached to one of the first housing and the second housing. The sealing wall is formed on the other of the first housing and the second housing.

According to this characteristic configuration, in a state where the first housing and the second housing are thermally welded, the thin plate-like seal body is flexibly deformed and contacts the seal wall in the seal portion formed inward from the welding position. It is possible to create a sealed state. By creating the seal state in this way, the inconvenience that the gap between the first housing and the second housing communicates with the space near the welding position can be suppressed by the seal portion. In particular, since the seal body is thin and can be flexibly deformed, even if a part of the seal body contacts the seal wall during the heat welding, the press contact during the heat welding is not hindered.
Accordingly, a fluid pressure pump that can be operated with high efficiency by suppressing the fluid that tends to flow outward from the gap between the first housing and the second housing by the seal portion and suppressing reduction in efficiency of the pump is configured. It was done.

  As another configuration, the seal body is formed to extend in a direction along a relative movement direction of the first housing and the second housing in the heat welding, and the seal wall is formed with respect to the relative movement direction. It may be formed in an inclined posture.

  According to this, when performing thermal welding, even if there is some error in the relative movement amount between the first housing and the second housing, the tip of the seal body can be reliably brought into contact with the seal wall. It becomes possible and can create a good sealing property.

A feature of the present invention includes a housing in which a first housing made of resin and a second housing made of resin are joined by thermal welding at a welding position, and includes a pump rotor accommodated in the housing,
A first labyrinth wall in a posture inclined with respect to a relative movement direction of the first housing and the second housing in the thermal welding, and a second labyrinth disposed in proximity to the inner position of the thermal welding. While forming a labyrinth part consisting of walls,
The first labyrinth wall is formed on one of the first housing or the second housing, and the second labyrinth wall is formed on the other of the first housing or the second housing. It is in.

According to this characteristic configuration, in the state where the first housing and the second housing are thermally welded, resistance is applied to the fluid in the labyrinth portion formed by the first labyrinth wall and the second labyrinth wall that are on the inner side of the welding position. Suppresses fluid flow. In this way, since the flow of fluid is suppressed in the labyrinth portion, the amount of fluid flowing into the space near the welding position from the gap between the first housing and the second housing can be reduced. In particular, since the labyrinth portion is composed of a labyrinth wall and a second labyrinth wall that are spaced apart from each other, the press contact during heat welding is not hindered.
Therefore, a fluid pressure pump capable of restricting the flow of fluid to flow outward from the gap between the first housing and the second housing by the labyrinth portion, suppressing a decrease in the efficiency of the pump, and operating at high efficiency. Configured.

A feature of the present invention includes a first housing made of resin and having a welded portion, and a second housing made of resin and having a welded portion,
One of the first housing and the second housing is formed with a thin plate-like seal body inside the welded portion, and the other of the first housing and the second housing is sealed inside the welded portion. Walls are formed,
By applying heat in a state where the welded portion of the first housing and the welded portion of the second housing are in pressure contact with each other, the housing is formed by heat welding at the welding position, and on the inner side of the welding position. The seal portion is formed by bringing the seal body into contact with the seal wall.

According to this characteristic configuration, the first housing and the second housing are thermally welded at the respective welded portions, thereby making it possible to manufacture a housing in which the seal portion is disposed on the inner side with respect to the welding position. Further, in the seal portion, the thin plate-like seal body is flexibly deformed to come into contact with the seal wall to create a sealed state, so that the gap between the first housing and the second housing communicates with the space near the welding position. There is nothing. In particular, since the seal body is thin and can be flexibly deformed, even if a part of the seal body contacts the seal wall during the heat welding, the press contact during the heat welding is not hindered.
Therefore, the fluid pressure pump manufacturing method capable of suppressing the fluid that tends to flow outward from the gap between the first housing and the second housing at the seal portion, suppressing a decrease in the efficiency of the pump, and operating with high efficiency. was gotten.

It is sectional drawing of the fluid pressure pump of 1st Embodiment. It is sectional drawing of the decomposition | disassembly state of the fluid pressure pump of 1st Embodiment. It is sectional drawing of a seal part. It is sectional drawing of the seal part before welding. It is sectional drawing of the fluid pressure pump of 2nd Embodiment. It is sectional drawing of a labyrinth part. It is sectional drawing of the labyrinth part before welding. It is an expanded sectional view showing the relation of a labyrinth wall.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Overall Configuration of First Embodiment]
As shown in FIGS. 1 and 2, a pump rotor Pr is arranged in a pump chamber Hp formed inside a housing H to form a pump unit P, and an electric motor unit M that drives and rotates the pump rotor Pr; The centrifugal fluid pressure pump 100 is configured to include a control unit for controlling the electric motor unit M and C.

  The fluid pressure pump 100 is used as a water pump that circulates cooling water (an example of a fluid) between an engine and a radiator in a vehicle such as an automobile.

  The housing H includes a resin-made first housing 1 that houses the electric motor part M, a resin-made second housing 2 that is welded to the first housing 1 to form a pump chamber Hp, and the first housing 1. The third housing 3 made of resin is detachably provided on the side opposite to the pump chamber Hp.

  As the resin constituting the housing H, a thermoplastic resin is used. The third housing 3 may be a metal molding.

  In the fluid pressure pump 100, one end portion of the shaft 5 arranged coaxially with the rotary shaft X is supported in a state of being inserted into the first housing 1, and the other end portion is a guide of the second housing 2. It is held by the body 18. The guide body 18 is supported by the second housing 2 via a stay 19 on the inner surface of the second housing 2. The rotor R is supported on the shaft 5 through a bush 6 so as to be rotatable. In this configuration, the rotational axis X is the center of rotation of the rotor R, and at the same time the center of rotation when performing spin welding (an example of thermal welding).

  Of the rotor R, a motor rotor Mr having a permanent magnet 11 is formed on the inner end side (lower side in FIG. 1) of the first housing 1, and the end side of the rotor R arranged in the pump chamber Hp (see FIG. 1 is formed integrally with a pump rotor Pr having a disk-like portion 15.

  A stator is inserted into the first housing 1 at a position surrounding the motor rotor Mr, and the stator and the motor rotor Mr constitute an electric motor section M. The stator includes a stator core 12 in which a plurality of magnetic steel plates are laminated, an insulator 13 fitted into the stator core 12, and a coil 14 wound around the insulator 13.

  The pump rotor Pr includes a disk-shaped portion 15 integrally formed at the end of the rotor R, and a shroud 16 provided so as to rotate integrally with the disk-shaped portion 15, and a plurality of them disposed at intermediate positions thereof. An impeller 17 is provided. The pump portion P is configured by accommodating the pump rotor Pr in the pump chamber Hp.

  The second housing 2 is integrally formed with a suction cylinder portion 2a that is coaxial with the rotation axis X and a discharge cylinder portion 2b that extends tangentially from the outer periphery of the pump rotor Pr. The stay 19 described above is formed on the inner surface of the discharge cylinder portion 2 b, and a guide body 18 is provided for the stay 19.

  Inside the third housing 3, a control board 21 that controls the driving power supplied to the coil 14 of the electric motor part M is provided. In the first housing 1, a connector part 22 is provided in the vicinity of the third housing 3. Yes.

  With such a configuration, the control motor 21 controls the electric motor M to rotate the pump rotor Pr integrally with the rotor R, and feeds the cooling water sucked from the suction cylinder 2a from the discharge cylinder 2b. Is possible.

[Structure to achieve spin welding]
A thermoplastic material is used as the resin of the first housing 1 and the second housing 2, and the first housing 1 and the second housing 2 are joined by spin welding at the welding position WP.

  In the spin welding, as shown in FIG. 4, the first housing 1 and the second housing 2 are disposed, and these are relatively rotated around the rotation axis X at a high speed, so that the first welding portion of the first housing 1 is provided. 25 and the second welded portion 27 of the second housing 2, so that the contact position is melted by the frictional heat generated when they come into contact with each other, and the first welded portion 25 and the second welded portion 27 are brought into contact with each other. Welding is performed.

  Accordingly, during this relative rotation, high-speed rotation is maintained and pressure is applied between the first welded portion 25 and the second welded portion 27, so that contact at a portion other than the contact position is suppressed, and the pump chamber On the inner surface of Hp, a gap G is formed at the boundary position between the first housing 1 and the second housing 2.

  Although the gap G is designed to be small, the gap G is inevitably formed. Therefore, when the pump rotor Pr rotates, a part of the cooling water flows into the gap G, which reduces the pump efficiency. Sometimes it was connected. In order to eliminate such an inconvenience, a seal portion S is provided in a region connected to the gap G on the inner side (side closer to the rotation axis X) than the welding position WP.

  That is, as shown in FIGS. 3 and 4, a flat first disk-like surface 1 </ b> D is formed in a position orthogonal to the rotational axis X at a position facing the second housing 2 in the first housing 1. A first flange portion 1F is formed at a position that is displaced in the direction of the third housing 3 with reference to the first flange portion 1F projecting outward in a posture orthogonal to the rotation axis X.

  Further, the first flange portion 1F is formed with a support surface 1E in a posture parallel to the first disk-shaped surface 1D. A first welded portion 25 is formed on the support surface 1E and is coaxial with the rotational axis X, and is formed in an annular shape. The first welded portion 25 is located on the inner side (side closer to the rotational axis X) with respect to the rotational axis. A sealing wall 26 is formed so as to be inclined.

  That is, the first welded portion 25 protrudes in the arrangement direction of the second housing 2 (upper side in FIG. 4), and the seal wall 26 approaches the rotation axis X closer to the second housing 2. It is formed on a conical surface.

  Similar to the first housing 1, a second disk-shaped surface 2 </ b> D having a posture orthogonal to the rotation axis X is formed in the second housing 2 at a position facing the first disk-shaped surface 1 </ b> D of the first housing 1. The second flange portion 2F is formed in a posture orthogonal to the rotation axis X so as to project outward from the second disk-shaped surface 2D.

  Further, the second flange portion 2F is formed with a second welded portion 27 that is coaxial with the rotational axis X and is annular, and the outer wall portion 28 is located on the outer side (the side farther from the rotational axis) than the second welded portion. A sealing body 29 is formed on the inner side of the second welded portion 27 and is thin and becomes thinner toward the protruding end (lower side in FIGS. 3 and 4). The second welded portion 27 is disposed at a position having a radius substantially equal to that of the first welded portion 25 with respect to the rotation axis X.

  Further, the sealing body 29 is set in a protruding amount so that the protruding end comes into contact with the seal wall 26 in a state where the first welding portion 25 and the second welding portion 27 are welded, and is flexibly deformed in this contact state. It is formed with a thickness that can be obtained. By providing the seal body 29 and the seal wall 26 in this way, a seal portion S with good sealability is configured.

[Spin welding]
In the spin welding process, the rotor R is disposed inside the first housing 1, and the relative positional relationship between the first housing 1 and the second housing 2 is maintained as shown in FIGS. Are shifted around each other in the direction along the rotation axis X while being rotated at high speed around the rotation axis X.

  In this step, the projecting ends of the first welded portion 25 and the second welded portion 27 are in pressure contact with each other, reach a state where each is melted by frictional heat, and a preset pressure is applied in this melted state. When the shift operation is performed and the positional relationship shown in FIG. 3 is reached, the rotation is stopped while the pressure is applied, and the spin welding is completed by maintaining this stopped state for a short time.

  When the spin welding is completed, the positional relationship is set so that the first disk-shaped surface 1D of the first housing 1 and the second disk-shaped surface 2D of the second housing 2 are close to each other. A gap G is formed at the boundary. An annular space 30 is formed inside the welding position WP.

  Further, in the spin welding process, although a burr is generated at the welding position WP and the outer wall 28 is formed so as to protrude outward due to centrifugal force, the outward protrusion can be suppressed. Furthermore, although the seal body 29 is in a position not in contact with the seal wall 26 at the start of spin welding, the seal body 29 comes into contact with the seal wall 26 just before the spin welding process is completed. Since the body 29 is flexibly deformed, a strong frictional force does not act and the contact portion does not fall into a welded state.

  By forming the seal portion S in this manner, the flow of the cooling water between the annular space 30 and the gap G can be blocked. Therefore, when the fluid pressure pump 100 is in operation, inconvenience that a part of the cooling water flowing along with the rotation of the pump rotor Pr flows into the annular space 30 from the gap G is suppressed.

  Assuming a configuration without the seal portion S for comparison, for example, with the rotation of the pump rotor Pr, the cooling water in the high pressure space of the pump chamber Hp flows into the annular space 30 through the gap G, and further, the annular space By flowing from 30 through the gap G to the low pressure space of the pump chamber Hp, pressure loss is caused and the pump efficiency is lowered.

  On the other hand, in the configuration in which the seal portion S blocks the flow of the cooling water between the annular space 30 and the gap G as described above, a part of the cooling water that flows along with the rotation of the pump rotor Pr is obtained. Although flowing into the gap G, inconvenience of flowing into the annular space 30 is suppressed. As a result, high pump efficiency is maintained without loss of pressure. Further, since the seal portion S is formed, the inconvenience that the small burr pieces generated during welding enter the pump chamber Hp is also eliminated.

[Second Embodiment]
Although the second embodiment has a configuration that is basically the same as that of the first embodiment, as illustrated in FIG. 5, the labyrinth is replaced with a seal portion S on the inner side (side closer to the rotation axis X) than the welding position WP. The point provided with the part T is different from the first embodiment.

  That is, as shown in FIGS. 6 and 7, as a structure for realizing spin welding (an example of thermal welding), the first welding portion 25 is attached to the first flange portion 1F of the first housing 1 as in the first embodiment. A second welded portion 27 is formed on the second flange portion 2F of the second housing 2.

  Further, the first labyrinth wall 31 having the same shape as the seal wall 26 shown in the first embodiment is formed on the first housing 1, and the second housing 2 is parallel to the first labyrinth wall 31. An adjacent second labyrinth wall 32 is formed.

  Further, in the spin welding process, the relative positional relationship between the first housing 1 and the second housing 2 is maintained as in the description in the first embodiment, and the second housing 2 is centered on the rotation axis X. In addition, a shift operation is performed in which the two are driven close to each other in the direction along the rotation axis X while being rotated at high speed.

  In addition, at the beginning of this step, the first labyrinth wall 31 and the second labyrinth wall 32 are in a positional relationship in which they are largely separated, and when the step is completed, as shown in FIG. The two labyrinth walls 32 are arranged so as to be extremely close to each other and are disposed over a relatively long distance to form the labyrinth portion T.

  With such a configuration, when the fluid pressure pump 100 is in operation, the cooling water flowing in the annular space 30 from the gap G flows into the annular space 30 even when a part of the cooling water that flows along with the rotation of the pump rotor Pr flows. A large resistance is applied to the flow to suppress the flow. As a result, inconvenience that a part of the cooling water flowing along with the rotation of the pump rotor Pr flows into the annular space 30 from the gap G is suppressed, and the pump efficiency is maintained high.

  In particular, as shown in FIG. 8, in the labyrinth portion T, the actual distance Da in the direction perpendicular to the surfaces of the first labyrinth wall 31 and the second labyrinth wall 32 and the axis in the direction to the rotation axis X When compared with the directional distance Db, the value of the actual distance Da is smaller than the value of the axial distance Db. Further, since the axial distance Db is equal to the gap G between the first disk-like surface 1D and the second disk-like surface 2D, the actual gap Da can be made smaller than the gap G so that good labyrinth performance can be achieved. .

[Another embodiment]
In addition to the above-described embodiments, the present invention may be configured as follows (the components having the same functions as those of the embodiments are given the same numbers and symbols as those of the embodiments).

(A) As the thermal welding, a technique of vibration welding (concept including ultrasonic welding) may be used. In the welding using vibration in this way, the first welding portion 25 and the second welding portion 27 are brought into pressure contact with each other in the direction along the rotation axis X (relative movement direction), and the first housing 1 and the second housing 2 are brought into contact with each other. It becomes the form which joins by making it vibrate relatively and generating frictional heat on the contact surface of the 1st welding part 25 and the 2nd welding part 27. FIG. In particular, in vibration welding, since the amplitude at the time of welding is small, there is no inconvenience of bringing the seal body 29 and the seal wall 26 into contact with each other or bringing the first labyrinth wall 31 and the second labyrinth wall 32 into contact.

(B) As heat welding, the 1st welding part 25 and the 2nd welding part 27 are heated beforehand using a heating plate etc., and are made to press-contact in the direction (relative movement direction) along these rotation axis X. A technique for performing welding may be used.

(C) As the thermal welding, the first welding part 25 and the second welding part 27 are pressed in the direction along the rotation axis X (relative movement direction), and welding is performed by heating with a laser beam from the outside. Technology may be used. In this technique, at least one of the first housing 1 and the second housing 2 needs to use a material that allows the laser beam to pass therethrough.

(D) The seal wall 26 is provided in the first housing 1, and the seal body 29 is provided in the second housing 2. That is, as compared with the first embodiment, the respective positional relationships are reversed. Moreover, you may comprise so that the sealing performance of the seal | sticker part S may be improved by providing the some sealing wall 26 and the some sealing body 29. FIG.

(E) The first labyrinth wall 31 is provided in the second housing 2, and the second labyrinth wall 32 is provided in the first housing 1. That is, as compared with the first embodiment, the respective positional relationships are reversed. Moreover, you may comprise so that the performance of the labyrinth part T may be improved by forming the 1st labyrinth wall 31 and the 2nd labyrinth wall 32 in multiple numbers. Furthermore, the shape of the first labyrinth wall 31 and the second labyrinth wall 32 is not limited to a linear shape, and may be formed in a wave shape or a sawtooth shape.

(F) As a fluid pressure pump 100, in order to construct a housing H such as a turbine pump or a cascade pump, a seal portion S or a labyrinth portion is attached to a heat-welded first housing 1 and second housing 2. T may be provided.

  The present invention can be used for a fluid pressure pump in which two housings are joined by heat welding.

DESCRIPTION OF SYMBOLS 1 1st housing 2 2nd housing 28 Outer wall part 26 Seal wall 29 Seal body 31 1st labyrinth wall 32 2nd labyrinth wall H Housing Hp Pump chamber Rp Pump rotor S Seal part T Labyrinth part WP Welding position

Claims (4)

A first housing made of resin and a second housing made of resin are in a joined state by thermal welding at a welding position, and a pump rotor accommodated in the housing is provided,
A seal portion including a thin plate-like seal body and a seal wall with which the seal body contacts is formed on the inner side of the welding position, and the seal body is attached to one of the first housing and the second housing. A fluid pressure pump formed, wherein the seal wall is formed on the other of the first housing and the second housing.   The seal body is formed to extend in a direction along a relative movement direction between the first housing and the second housing in the heat welding, and the seal wall is formed in an attitude inclined with respect to the relative movement direction. The fluid pressure pump according to claim 1. A first housing made of resin and a second housing made of resin are in a joined state by thermal welding at a welding position, and a pump rotor accommodated in the housing is provided,
A first labyrinth wall in a posture inclined with respect to a relative movement direction of the first housing and the second housing in the thermal welding, and a second labyrinth disposed in proximity to the inner position of the thermal welding. While forming a labyrinth part consisting of walls,
The fluid in which the first labyrinth wall is formed in one of the first housing or the second housing, and the second labyrinth wall is formed in the other of the first housing or the second housing. Pressure pump. A first housing made of resin and having a welding portion; and a second housing made of resin and having a welding portion;
One of the first housing and the second housing is formed with a thin plate-like seal body inside the welded portion, and the other of the first housing and the second housing is sealed inside the welded portion. Walls are formed,
By applying heat in a state where the welded portion of the first housing and the welded portion of the second housing are in pressure contact with each other, the housing is formed by heat welding at the welding position, and on the inner side of the welding position. A method for manufacturing a fluid pressure pump, wherein a seal portion is formed by bringing the seal body into contact with the seal wall.

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