A solenoid valve includes: a cylindrical spool that has an annular groove in an outer surface and moves along an axial direction under a driving force generated by a current being applied to a solenoid part; a cylindrical sleeve that has a through-hole capable of communicating with the annular groove and houses the spool; and an urging member that urges the spool by an urging force acting in a direction opposite from a direction in which the driving force is generated. When no current is applied to the solenoid part, a part of the through-hole communicates with the annular groove. When a current is applied to the solenoid part, an area of communication between the through-hole and the annular groove increases as the spool moves under the driving force acting against the urging force.

A screw spindle pump having a spindle housing, in which a drive spindle and at least one running spindle which meshes therewith are received in spindle bores, and having an outer housing which encloses the spindle housing and on which an axial inlet port and a radial outlet port are provided, wherein the spindle housing has an axial fluid outlet for the fluid delivered through the spindle housing by the drive spindle and the running spindle, which axial fluid outlet communicates with a fluid chamber, which is formed between the spindle housing and the outer housing, extends around 360°, and in turn communicates with the radial outlet port.

A screw spindle pump having a spindle housing, in which a drive spindle and at least one running spindle which meshes therewith are received in spindle bores, and having an outer housing which encloses the spindle housing and on which an axial inlet port and a radial outlet port are provided, wherein the spindle housing has an axial fluid outlet for the fluid delivered through the spindle housing by the drive spindle and the running spindle, which axial fluid outlet communicates with a fluid chamber, which is formed between the spindle housing and the outer housing, extends around 360°, and in turn communicates with the radial outlet port.

A screw spindle pump having a spindle housing in which a drive spindle and at least one running spindle meshing therewith are received in spindle bores, and an external housing which accommodates the spindle housing, an axial inlet connection and a radial outlet connection being provided on the external housing. The spindle housing has an axial fluid outlet for the fluid conveyed via the drive spindle and the running spindle through the spindle housing, as well as a drive motor having a drive shaft which runs through a bore in a housing wall, which axially closes the interior of the external housing, io and which is coupled to the drive spindle. A part of the fluid flowing out of the fluid outlet of the spindle housing flows through the seal-free bore along the drive shaft into the drive motor, cools this drive motor and flows back into the external housing.

A screw spindle pump having a spindle housing in which a drive spindle and at least one running spindle meshing therewith are received in spindle bores, and an external housing which accommodates the spindle housing, an axial inlet connection and a radial outlet connection being provided on the external housing. The spindle housing has an axial fluid outlet for the fluid conveyed via the drive spindle and the running spindle through the spindle housing, as well as a drive motor having a drive shaft which runs through a bore in a housing wall, which axially closes the interior of the external housing, io and which is coupled to the drive spindle. A part of the fluid flowing out of the fluid outlet of the spindle housing flows through the seal-free bore along the drive shaft into the drive motor, cools this drive motor and flows back into the external housing.

A screw spindle pump having a spindle housing, in which a drive spindle and at least one running spindle which meshes therewith are received in spindle bores, an outer housing which encloses the spindle housing, and a cover component which is placed axially onto the outer housing and on which both an axial fluid inlet port and a lateral fluid outlet port are provided, wherein the fluid inlet port communicates with a fluid inlet of the spindle housing and the fluid outlet port communicates with a fluid outlet of the spindle housing, wherein the cover component is fastenable to the outer housing in a plurality of marked rotational positions with a first pitch, and wherein the spindle housing is fastenable to the cover component and/or in the outer housing in a plurality of marked rotational positions with a second, smaller pitch.

A screw spindle pump having a spindle housing, in which a drive spindle and at least one running spindle which meshes therewith are received in spindle bores, an outer housing which encloses the spindle housing, and a cover component which is placed axially onto the outer housing and on which both an axial fluid inlet port and a lateral fluid outlet port are provided, wherein the fluid inlet port communicates with a fluid inlet of the spindle housing and the fluid outlet port communicates with a fluid outlet of the spindle housing, wherein the cover component is fastenable to the outer housing in a plurality of marked rotational positions with a first pitch, and wherein the spindle housing is fastenable to the cover component and/or in the outer housing in a plurality of marked rotational positions with a second, smaller pitch.

A screw spindle pump having a spindle housing, in which a drive spindle and at least one running spindle which meshes therewith are received in spindle bores, and which has an axial fluid inlet and an axial fluid outlet, and also an outer housing enclosing the spindle housing, wherein either a support device which axially supports the at least one running spindle and includes an axially projecting support pin is provided on the spindle housing, which is plastic, in the region of the fluid outlet, or a support device which axially supports the at least one running spindle and includes an axially projecting support pin is provided on a housing plate which is fitted on the outer housing, axially closes the outer housing, and is plastic.

A screw spindle pump having a spindle housing, in which a drive spindle and at least one running spindle which meshes therewith are received in spindle bores, and which has an axial fluid inlet and an axial fluid outlet, and also an outer housing enclosing the spindle housing, wherein either a support device which axially supports the at least one running spindle and includes an axially projecting support pin is provided on the spindle housing, which is plastic, in the region of the fluid outlet, or a support device which axially supports the at least one running spindle and includes an axially projecting support pin is provided on a housing plate which is fitted on the outer housing, axially closes the outer housing, and is plastic.

The present invention discloses an anti-decompression gear fuel pump for broken bubbles, characterized by comprising: a drive motor; and a pump body and a pump cover successively installed on the top end of the drive motor, wherein the pump body is provided with a groove, and a driving gear, a left driven gear and a right driven gear which are installed in the groove and are linked through a motor shaft of the drive motor; meanwhile, the driving gear is respectively internally engaged with the left driven gear and the right driven gear; the pump cover is provided with an A end of a fuel outlet, a D end of a circulating fuel outlet, a B end of a circulating fuel inlet, and a C end of a fuel inlet; and the A end of the fuel outlet, the D end of the circulating fuel outlet, the B end of the circulating fuel inlet, and the C end of the fuel inlet are penetrated into the groove of the pump body. The anti-decompression gear fuel pump for broken bubbles, designed in the present invention, not only solves a decompression problem generated because bubbles appear in a fuel pipeline, but also has scientific and reasonable structure.