JPH0115715B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pump for transporting refrigerant in a heat transfer device that uses refrigerant as a heat transport medium, and its purpose is to prevent refrigerant from leaking from the refrigerant pump. It also aims to simplify processing and assembly.

In general, fluid machines (pumps and compressors) are structurally classified into three types: closed, semi-closed, and open. The criteria for classification is often based on the amount of leakage of working fluid (water or refrigerant).

For example, in the case of pumps, mechanical seals are often used for shaft seals, so leakage of working fluid cannot be avoided, and the pump chamber is of an open type.

In conventional liquid pumps, such as hydraulic pumps, the pump chamber is open, ie, sealed via an O-ring or flat packing. However, it has been extremely difficult to completely seal the casing due to aging of the rubber material, swelling effect of oil, etc. In a heat transfer device that uses a refrigerant as a heat transfer medium, if the refrigerant in the system leaks into the atmosphere, the amount of refrigerant decreases, making it impossible to obtain appropriate heat transfer characteristics.

Furthermore, refrigerant has an extremely low viscosity compared to oil, etc., and requires precision machining of parts and high assembly accuracy, so it is necessary to minimize the number of precision machining parts and create an overall configuration that facilitates ensuring assembly accuracy.

The present invention aims to achieve the above object, and its characteristics include that the pump chamber is composed of a plurality of casings and is completely hermetically sealed by welding, and that the inside of the sealed casing is divided into a high pressure chamber and a low pressure chamber by a partition plate. The refrigerant is separated into chambers, and the upper and lower bearings, cylinders, etc. that make up the pump are fastened to the partition plate with bolts, and the refrigerant that has been pumped is discharged into the high-pressure chamber and then out of the pump chamber. .

An embodiment of the present invention will be described below with reference to the drawings. Figure 1 shows a heat transfer device using a refrigerant as a heat transfer medium. 1 is a refrigerant heating heat exchanger, 2 is a user side heat exchanger, and 3 is a refrigerant pump. These are connected in a ring to form a closed circuit. do. A fluorocarbon refrigerant is sealed in the sealed circuit to form a heat transfer cycle.

In the above-described heat transfer cycle, the refrigerant is heated and evaporated in the refrigerant heating heat exchanger 1, flows into the user-side heat exchanger 2, radiates heat, and condenses and liquefies. Then, the refrigerant is pumped by the refrigerant pump 3 and flows into the refrigerant heating heat exchanger 1 again.

4 is a lower housing that constitutes a pump chamber, 5 is an upper housing, and these upper and lower housings 4,
5 are finally joined together by welding to form a pump chamber. The upper housing 5 comes into contact with the step of the lower housing 4 and is welded thereto. A partition plate 6 partitions the pump chamber into a high pressure chamber 7 and a low pressure chamber 8. Further, the partition plate 6 is connected to the lower housing 4.
It is inserted in contact with the step and fixed to the peripheral edge by welding.

9 is a lower bearing, 10 is a cylinder, and 11 is an upper bearing, which are stacked in sequence and fastened to the partition plate 6 with a plurality of bolts 12. Further, a rotor 13 is located in a gap formed by the upper bearing 11, the cylinder 10, and the lower bearing 9. A plurality of vanes 14 are inserted into vane grooves (not shown) provided in the rotor 13. 15 is a shaft, which is integrally molded with the rotor 13. Note that the upper bearing 11 has a discharge hole (not shown).
The lower bearing 9 is provided with a suction hole (not shown).

16 is a pump side magnet, which is connected to the shaft 1.
It is fixed at 5. 17 is an end bearing.

A motor-side magnet 18 is fixed to a motor shaft (not shown). 19 is the lower housing 4
20 is a suction pipe fixed to the upper housing 5, and 20 is a discharge pipe fixed to the upper housing 5.

By driving the motor with the above configuration,
A motor-side magnet 16 fixed to the motor shaft is driven. As a result, the shaft 15 rotates, the rotor 13 also rotates, and a pumping action is performed by changing the volume of the gap partitioned by the plurality of vanes 14. In other words, the refrigerant liquefied in the heat exchanger 2 on the user side flows into the low pressure chamber 8 through the suction pipe 19 and flows from the low pressure chamber 8 into the lower bearing 9.
The refrigerant flows into the gap volume of the pump part through the discharge hole, and after being subjected to pump action, is once discharged into the high pressure chamber 7 through the discharge hole of the upper bearing 11, and then sent to the refrigerant heating evaporator 1 through the discharge pipe 20. .

With the above pump configuration, the part through which the refrigerant flows is hermetically sealed by welding the upper and lower housings together, and since power is transmitted between the motor and pump shaft by a magnet, there is no shaft seal part.
Leakage of refrigerant from the pump chamber can be completely prevented. Therefore, an appropriate amount of refrigerant in the heat transfer device is always ensured, making it possible to maintain stable heat transfer characteristics.

In addition, the pump chamber is separated into a high-pressure chamber and a low-pressure chamber by a partition plate, and the lower bearing, cylinder, and upper bearing are sequentially stacked on this partition plate and fastened with multiple bolts, making assembly easy and improving assembly accuracy. . In addition, since the lower housing is provided with a step, the upper housing and the partition plate are in contact with each other and are securely fixed.
Furthermore, the assembly involves fixing the partition plate to the lower housing, fastening the lower bearing, cylinder, and upper bearing to the partition plate with multiple bolts, and inserting the rotor with a shaft into the gap formed by the upper bearing, cylinder, and lower bearing. After the pump side magnet is fixed to the shaft, the upper housing is covered, and the upper and lower housings are welded together while flowing an inert gas such as nitrogen into the pump chamber, which has the excellent effect of making assembly extremely easy. It is. Furthermore, the pump chamber through which the refrigerant flows is made up of a welded sealed container, so there is no flow of refrigerant and it can withstand long-term use. Particularly when a high-pressure refrigerant is used as the working fluid, refrigerant leakage directly affects heat transfer characteristics, and the absence of refrigerant leakage is important from the basic characteristics.

[Brief explanation of drawings]

FIG. 1 is a cycle diagram of a heat transfer device, FIG. 2 is a schematic sectional view of a refrigerant pump in an embodiment of the present invention,
FIG. 3 is an internal sectional view of the pump section. 4...Lower housing, 5...Upper housing, 6
...Partition plate, 7...High pressure chamber, 8...Low pressure chamber, 9...
...Lower bearing, 10...Cylinder, 11...Upper bearing,
13...rotor, 14...vane, 15...shaft, 16...pump side magnet, 18...motor side magnet, 19...suction pipe, 20...discharge pipe.

Claims (1)

[Claims] 1. A sealed pump chamber is formed by welding the upper housing that is in contact with the upper step of the lower housing that has a step above and below, and the pump chamber is connected to the lower step of the lower housing by a partition plate fixed to the high pressure chamber. and a low pressure chamber, a lower bearing, a cylinder, and an upper bearing are fastened to the partition plate with a plurality of bolts, and a rotor having a shaft is arranged in a gap formed by the upper bearing, cylinder, and lower bearing, and a pump-side magnet and an end face bearing are attached to the shaft to form a pump mechanism section, the pump mechanism section is positioned in a high pressure chamber, and a magnet magnetically coupled to the pump-side magnet is rotated outside the pump chamber. A refrigerant pump with a motor that