JPH01167478A - Liquid pump - Google Patents

Abstract

PURPOSE:To eliminate a packing for preventing leakage by providing thread ridges in the direction for transferring liquid from opposite end sections to the central section onto a biaxial parallel rotor penetrating through the axis of a biaxial parallel cylinder. CONSTITUTION:In a pumping section 2, a biaxial parallel rotor penetrates through a biaxial parallel cylinder 13 with the opposite ends thereof being supported by bearings 14, 15 placed in the liquid. Thread ridges are provided to the rotor shaft 12 in the direction for feeding the liquid from the opposite end sections to the central section, where thread ridges of the biaxial rotor 12 engage each other with the inner diameter of the cylinder 13 fitting to the ridges thus eliminating gap for leaking liquid quickly. A pipe 16 for feeding the liquid to the outside of a tank is provided in the center of the cylinder 13.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention 1 relates to liquid pumps, particularly for pumps of high-temperature liquids such as heating media, and liquids that have a bad odor or are toxic and whose leakage is not allowed. Applicable.

<Prior Art> Conventional liquid pumps include turbo pumps in which an impeller rotates within a casing, and positive displacement pumps in which a piston, plunger or rotor displaces liquid. In either case, a gasket is provided at the location where the rotating shaft or reciprocating shaft passes through the casing to prevent liquid leakage.

<Problems to be solved by the invention> As long as the packing exists, leakage problems will occur due to wear, damage, etc. Furthermore, the heat-resistant temperature of the packing material used in ordinary liquid pumps is limited to 300°C, so it has been impossible to use a heat medium higher than that.

Therefore, the present invention provides a liquid pump without packing.

Means for Solving the Problems> In the liquid pump of the present invention, a biaxial parallel rotor passes through the axis of a biaxial parallel cylinder whose both ends are open in a tank that stores the liquid to be pumped, and the rotor Threads are provided in which the threads engage with each other and are oriented to transfer the liquid from both ends to the center, and a pumping part consisting of a delivery pipe is provided in the center of the biaxial parallel cylinder to send out the liquid in the cylinder to the outside of the tank. , the two-shaft rotor is configured to be rotationally driven by a motor installed outside the tank.

Function> Since the two-axis parallel rotor and two-axis parallel cylinder that make up the pumping section are both immersed in the liquid, there is no leakage problem.

In the pumping section, liquid enters the cylinder from both open ends of the biaxially parallel cylinder, is sent to the center by mutually meshing biaxially parallel rotors, and is delivered to the outside through the delivery tube. Even if an external failure occurs and delivery becomes impossible and the pressure in the delivery pipe increases, the amount of liquid entering the cylinder from both ends will only decrease, and no overflow or leakage problems will occur.

<Example> FIG. 1 shows an overall configuration diagram of an example of a heat medium pump, and FIG. 2 shows a sectional view taken along line A-A of the pumping section.

A pumping section 2 and a heater 3 are provided at the bottom of the tank 1, and an introduction pipe 4 for the liquid to be pumped, an opening for introducing and removing the liquid, and a lid 5 thereof are provided at the top. Also,
A motor 7 and a gear mechanism 8 that divides the output of the motor into two shafts in different directions are provided on a frame 6 above the pumping section outside the tank, and the output shaft of the gear mechanism 8 and the rotor shaft of the pumping section 2 are connected to a shaft coupling 9. .10 and is connected by a connecting shaft 11.

As shown in FIG. 2, the pumping part 2 has two parallel rotor shafts 12, 12 penetrating into a two-axis parallel cylinder 13,
Both ends of the rotor shaft are supported by bearings 14 and 15 provided in the liquid, and this rotor shaft is provided with threads that direct the liquid from both ends to the center, and the threads of the two-shaft rotor are engaged with each other. , the inner diameter of the cylinder 13 fits this thread diameter, with no gap therebetween for rapid escape of liquid. Both ends of the biaxially parallel cylinder 13 are open into the tank so that liquid can be taken in, and a delivery gap 16 is provided in the center of the cylinder 13 for sending the liquid out of the tank.

In order to prevent oxidation and deterioration of the liquid, an inert gas such as nitrogen gas is introduced from an inlet 17 at the top of the tank. In addition, a floating layer 18 of small hollow glass beads is provided on the liquid surface for heat retention, and a mesh 19 is provided below the liquid surface to prevent these glass beads from entering the pumping section together with the liquid. ing.

<Effects of the Invention> According to the present invention, the entire pumping section is shallowly submerged in the liquid to be pumped out, and a liquid inlet is formed between the cylinder end where the packing is usually provided and the rotor shaft, and the packing is inserted here. Since no leakage problems occur in the pumping section. Note that since the rotor shaft extends to the outside of the tank above the liquid level and is driven by a motor installed outside the tank, there is no problem of liquid leakage from the rotor shaft.

In this way, there is no need for a seal to prevent leakage.
It becomes possible to realize a high-temperature heat medium pump that exceeds the heat-resistant temperature limit of Rotsukin material with a simple structure, and
It is safe to apply to liquid pumping where even a small amount of leakage may cause problems such as environmental pollution.

[Brief explanation of the drawing]

FIG. 1 is an internal sectional view of an embodiment of the present invention. FIG. 2 is a sectional view taken along the line AA in FIG. 1. 1...tank 2...Pumping part 4...Liquid introduction pipe 6...Motor 8...Gear mechanism 11...Connection shaft 12...Two parallel rotor shafts 13... Biaxial parallel cylinder 14...Bearing 15...Bearing Patent applicant: Masao Moriyama Representative Patent Attorney Nishi 1) Shin

Claims (3)

[Claims] (1) A biaxial parallel rotor passes through the axis of a biaxial parallel cylinder with both ends open in a tank that stores the liquid to be sent,
The rotor is provided with screw threads that engage with each other and are oriented to transfer the liquid from both ends to the center, and a pump consisting of a delivery pipe in the center of the biaxial parallel cylinder that sends out the liquid in the cylinder to the outside of the tank. 1. A liquid pump, wherein the two-shaft rotor is rotationally driven by a motor installed outside the tank. (2) A liquid pump according to claim 1, which includes a heater for heating the liquid in the tank and is used for sending out the heat medium liquid. (3) A pumping section comprising the two-axis parallel cylinder, the two-axis parallel rotor, and a delivery pipe is disposed at the bottom of the tank, and the motor is installed above the tank. The liquid pump according to item 1 or 2.