JPH038863Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a fluid pipe connection device in a pump device.

<Prior art> In general, in a connection device that connects a fluid pipe to a fluid discharge port of a pump device, the flare portion of the fluid pipe is brought into close contact with a seat union, and the fluid discharged from the pump device is passed through the through hole formed in the seat union. The fluid is delivered to the fluid pipe through the hole.

<Problems to be solved by the invention> However, with this type of seat union, depending on the diameter of the through hole formed in the seat union, there is a problem in which abnormal noise is generated by the fluid passing through the through hole. be. In other words, if the diameter of the through-hole is made small, when high-viscosity fluid passes through the through-hole at low temperatures, a large passage resistance will occur, increasing the pressure of the fluid on the discharge side of the pump device, and increasing the difference on the suction side. As the pressure increases, cavitation occurs within the pump chamber, which increases the noise. Further, if the diameter of the through hole is increased, the pulsation reduction effect caused by the throttling action when the discharged fluid passes through the through hole at high temperatures will not occur, and the abnormal noise caused by the fluid pulsation will become louder. As described above, it has not been possible to determine the diameter of the through hole that can effectively prevent the generation of abnormal noise both at low temperatures and at high temperatures.

<Means for solving the problem> The present invention has a hole in the end face of the seat union that is deformed to a diameter that is smaller than the through hole of the seat union at high temperatures and causes a squeezing action, and a hole that is larger in diameter than the through hole at low temperatures. This is characterized by a fixed aperture member made of a shape memory alloy that deforms to a hole diameter of .

<Example> Hereinafter, an example of the present invention will be described based on the drawings. In FIG. 1, reference numeral 10 indicates a housing of the pump device.A fluid discharge passage 11 is bored in this housing 110 in correspondence with a boss portion 12, and a screw hole 13 is provided at the opening of this fluid discharge passage 11. It is formed. This screw hole 13 is the fluid discharge passage 1
1, and in the portion surrounding this discharge passage 11, the bottom surface of the screw hole 13 functions as a support end surface on which the seat union 15 is seated.

The seat union 15 is made of brass, and has leg portions 16 projecting from its lower surface that fit into the fluid discharge passage 11. A through hole 14 is formed from the top surface of the seat union 15 to the tip of the leg portion 16. Furthermore, as shown in FIG. 2, a spirally formed aperture member 17 is disposed at the tip of the leg 16 formed on the seat union 15, and the outer peripheral end of the aperture member 17 is attached to the leg 16. Fixed by welding. This aperture member 17 is made of a shape memory alloy, and at low temperatures, the second
As shown in the figure, the shape is such that a space with a larger diameter than the through hole 14 is formed in the center, and when the temperature is high, the size of the aperture member 17 becomes smaller overall as shown in FIG. The radius of the space formed in the portion becomes smaller than the diameter of the through hole 14, producing a constriction effect. The diameter of the through hole 14 is such that even if a high viscosity fluid passes through in cold or cold weather, the pressure of the fluid in the fluid discharge passage 11 will not increase due to passage resistance, thereby reducing the occurrence of abnormal noise. It is set to diameter.

A flare nut 20 is screwed into the screw hole 13, and a fluid pipe 22 having a flared portion 21 formed at the tip of an equal diameter portion is inserted through the flare nut 20. By tightening the flare nut 20, the seating surface 18 of the seat union 15 is pressed against the bottom surface of the screw hole 11, and the inner peripheral surface of the flare portion 21 comes into close contact with the conical surface of the seat union 15.

In the connection device having the above configuration, when the weather is cold, the throttle member 17 opens and the throttle effect is created only by the through hole 14 formed in the sheet union 15. As mentioned above, the diameter of the through hole 14 is Since the diameter is set to reduce the generation of abnormal noise during cold weather, the generation of abnormal noise is prevented. Further, when the air temperature becomes normal or high temperature and the pump device becomes high temperature, the diameter of the throttle member 17 becomes smaller, and when the discharged fluid passes through this throttle member 17, a throttling action occurs and a pulsation reducing action occurs. . Thereby, it is possible to reduce the occurrence of abnormal noise due to pulsation of the discharged fluid that occurs at room temperature or high temperature.

<Effects of the invention> As described above, in the present invention, a hole with a diameter smaller than that of the through hole that causes a squeezing effect at high temperatures is provided on the end face of the sheet union in which a large diameter through hole that does not cause a squeezing effect is formed. The pump device is constructed by fixing a restricting member made of a shape memory alloy that deforms to a diameter larger than the through hole at low temperatures, so that the passage resistance of high viscosity fluid at low temperatures causes the pump device to This has the effect of reducing both noises caused by the increase in the force of the fluid inside the pump, as well as noises caused by the pulsation of the discharged fluid at high temperatures. .

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view of a fluid pipe connection device in a pump device;
FIG. 2 is a sectional view taken along the line - in FIG. 1, and FIG. 3 is a diagram showing the operating state at high temperatures. 11... Fluid discharge passage, 13... Screw hole, 14
...Through hole, 15... Seat union, 16...
Leg portion, 17... Aperture member, 18... Seating surface, 20
...Flare nut, 21...Flare part, 22...
fluid tube.

Claims (1)

[Scope of utility model registration request] A screw hole is formed in the fluid discharge port of the pump device, and a fluid passage with a smaller diameter than the screw hole is opened at the bottom of the screw hole to form a support end surface, and a large diameter through hole that does not cause a throttling action on the support end surface. The seat union formed with the above is seated, the flare part formed at the tip of the equal diameter part of the fluid pipe is brought into contact with the seat union, and the flare part is brought into close contact with the seat union by means of a flare nut that is screwed into the screw hole. In the fluid pipe connection device in the pump device,
The end face of the seat union is made of a shape memory alloy that deforms to a hole diameter that is smaller than the through hole of the sheet union and causes a squeezing action at high temperatures, and deforms to a hole diameter larger than the through hole at low temperatures. 1. A fluid pipe connection device in a pump device, characterized in that a throttle member is fixed.