JPS6132206Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a packing holder for use in shaft sealing devices such as pumps, and particularly to a packing holder for injecting external liquid.

Conventionally, this type of seal holder has a hole for injecting external liquid and a drain hole in the same chamber, so if a large amount of external liquid is injected, it cannot escape from the drain hole, and the seal holder and shaft sleeve or sleeve If the liquid is splashed from the gap between the nuts, or if the amount of external liquid injected is small, it will not mix sufficiently with the pump liquid leaking from the gland packing, and if the pump liquid is high-temperature water, it will turn into steam and leak. There were flaws.

In order to eliminate this drawback, this device provides a hole for injecting external liquid and a discharge hole in separate chambers, and the liquid is depressurized in the gap between the first chamber and the second chamber. This prevents the liquid from flying out from the gap between the seal holder and the sleeve nut, and even when the amount of external liquid is small, it is squeezed by the partition wall.
Since the liquid is sufficiently mixed with the liquid leaking from the gland packing in the first chamber and then enters the second chamber and is discharged from the discharge hole, the high temperature liquid does not partially evaporate and become steam and is not spouted out.

To explain the figures, Fig. 1 shows a conventional packing holder, where 1 is a pump shaft, 2 is a sleeve, 3 is a sleeve nut, 4 is a stuffing box, and 5 is a stuffing box.
6 is a packing, 10 is an O-ring between the shaft 1 and the sleeve 2. The liquid leaking from the pump passes through the seal 5 from the left side of the figure and enters the chamber 9 inside the seal presser 6.

The external liquid enters the chamber 9 from the inlet hole 7 as shown by the arrow _F1 , passes through the connecting hole 71 in the packing retainer 6, mixes with the pump liquid, and is discharged from the discharge hole 8 as shown by _F2 .

In such a conventional configuration, when the amount of external liquid injected is large, it cannot escape from the discharge hole 8, and the liquid may splash from the gap C between the seal holder 6 and the sleeve nut 3, or the amount of external liquid injected may be too large. If the amount is low, it will not mix sufficiently with the liquid leaking from Packin 5,
The drawback is that when the pump fluid is high temperature water, it turns into steam and leaks.

Figure 2 shows the packing presser of this invention.
The same reference numerals as in the figure indicate the same parts. A first chamber 91 and a second chamber 92 are formed in the packing presser 6 by a partition wall 90, and the external liquid flowing from the inlet hole 7 as shown by the arrow _F1 is passed through the connecting hole 71 to the first chamber 92. Enter room 91. There, it is mixed with the leaked liquid that has passed through the packing 5, is depressurized in the gap S between the partition wall 90 and the sleeve nut 3, enters the second chamber 92, and is discharged from the discharge hole 8 in the second chamber. It is discharged.

Since the packing holder of this invention has such a structure, the pressure of the mixed liquid is reduced in the gap S, the pressure in the second chamber is low, and the liquid does not splash outside from the gap C between the packing holder and the sleeve nut. The greater the amount of external fluid injected or the amount of pump fluid leaking through the seal, the greater the pressure reduction effect of the gap S, so even if the pressure in the first chamber increases, the pressure in the second chamber can be maintained at approximately atmospheric pressure. It will be done.

Furthermore, even if the amount of external liquid injected is small, the gap S restricts the injection, so the liquid leaks from the gasket and mixes sufficiently before entering the second chamber and being discharged from the discharge hole. It does not partially evaporate into steam and eject.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional packing holder, and FIG. 2 is a sectional view showing a packing holder of this invention. Explanation of symbols, 1...Shaft, 2...Sleeve, 3...
...Sleeve nut, 4...Stuffing box, 5...Packkin, 6...Packkin presser, 7...
... Groove inflow hole, 71 ... Connection hole, 8 ... Discharge hole,
9, 91, 92... Chamber, 10... O-ring.

Claims (1)

[Scope of utility model registration request] A hole for injecting liquid from the outside and a discharge hole in a packing holder used for a shaft sealing device such as a pump, in which liquid is injected from the outside, mixed with leaked liquid leaking from the gland packing, and discharged to the outside. A presser foot characterized by having and in separate chambers.