JPS58210396A - Self-priming motor pump - Google Patents

Abstract

PURPOSE:To prevent breakdown of casing by making such that a choking plug formed to be coupled to the priming port upon completion of priming will be suspended in the gas-water separating chamber when the choking plug coupled with absorbing body at one end is coupled to the priming port thereby absorbing the expansion of water due to freezing. CONSTITUTION:The priming port 5e provided above the gas-water separation chamber 5d is arranged at the position where priming water will never be scattered to the outside of the priming case 5 while a resilient choking plug 8 coupled at one end with an absorptive body 18 composed of recoverable expanded body is coupled to the priming port 5 upon completion of priming of a motor pump to absorb the volume expansion of water due to freezing of motor pump through motion of said body 18 and the water feed pipe 11 toward the pressuure tank 1 side. Consequently the breakdown due to freezing can be prevented sufficiently through the small absorptive body 18 without modifying the dimension of the self priming motor pump resulting in the improvement of self-priming performance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in self-priming electric pumps, and more particularly to freeze damage prevention devices.

Figure 1 shows a self-priming electric pump that is commonly known in the past.
This will be explained accordingly. In the figure, 1 is a pressure tank, 2 is an electric motor mounted and connected to the top surface of this pressure tank 1, and is rotated (or stopped) by opening and closing of a pressure switch connected to the pressure tank 1. do. 8 is a fly wheel coupled to one end of the rotor shaft (not shown) of the electric motor 2; 4 is coupled to the electric motor 1 and a casing cover (
A suction port 4a, a discharge port 4b, and a pressurizing water channel (not shown) are formed in a pump casing that cooperates with a pump chamber (not shown) to form a pump chamber (not shown). 5 is a self-priming case coupled to the pump casing 4 via a gasket (not shown), and suction channels A, F)-a communicate with the suction port 4a.
, a reverse ratio valve chamber 5b communicating with the suction passages A and Ra, suction passages B and 5c communicating with the positive valve chamber 5b, and a steam/moisture south chamber 5d communicating with the discharge port 4bf.
A priming port 5e consisting of a penetrating female thread is provided at the upper end of the air-water separation chamber 5d, and a priming port 5e is provided at the lower end of the air-water separation chamber 5d at the upper end. Through hole 5f,
The inverse ratio valve chamber 5b is configured with a through female thread 5g provided therein. 6 is the suction channel B and Fl of the check valve chamber 5b.
The annular valve seat 7 fitted into the c-side opening t is a stopper screwed onto a female through-thread 5g, and a bottomed hole 7a is formed at the bottom at L% in the figure. Reference numeral 8 indicates an embolus consisting of a priming tap screwed together with a priming port, and 9 indicates a reverse valve, with a protrusion 9a formed at one end being loosely fitted into the bottomed hole 7a, and formed at the other end. A disk-shaped valve body 9b comes into contact with and separates from the end surface of the valve seat 6, thereby opening the suction channels B, F) and C side openings, and closing X). Reference numeral 10 denotes a water suction pipe that is watertightly connected to one end of the suction channels B and F+C, and the other end is immersed in water, for example, in the skin of a well. 11 has one end passing through the through hole 5f and protruding into the steam/water separation chamber 5d, and the other end passing through the through hole 1a provided at the upper end of the pressure tank 1 to a predetermined depth within the pressure tank 1. Water pipe protruding from the side, 1
Reference numeral 2 denotes an O-ring fitted to the upper outer circumferential surface of the water pipe 11, which is pressed by the O-ring retainer 18 to the outer end surface of the through hole 5f and the outer circumferential surface of the water pipe 11, thereby separating the water pipe 11 and the through hole 5f. maintain airtightness with 14 is an O-ring fitted on the lower outer peripheral surface of the water pipe 11;
5 is pressed against the outer end surface of the through hole 1a and the outer peripheral surface of the water pipe 11 to maintain airtightness between the water pipe 11 and the through hole 1a). The water pipe 11 is made movable toward the pressure tank 1 by an amount corresponding to the volume expansion when the water in the steam/water separation chamber 5d freezes and expands in volume. Reference numeral 16 denotes a discharge pipe that is watertightly connected to an annular member 17 that is connected to the outer peripheral edge of the through hole 1b provided below the side of the pressure tank 1, and has a water tap (not shown) at one end. ) are combined.

Next, the operation of the device configured as described above will be briefly explained. After removing the embolus 8 and the plug 7 from the priming hole 5e and connecting them to the priming port 5e and the single female screw 5g, the rotor shaft and the fly wheel 3 are turned on. Rotate. When the spring 3 rotates, the pump chamber, the suction channels A and 5a, and the reverse valve chamber 5b become negative pressure in order, and the reverse valve 9 is guided by the bottomed hole 7a and rises, and the valve body 9b is moved from the valve seat 6. Separately, suction channel B, 5c, water suction pipe 10
The air mixed with priming water flows into the pump chamber, is pressurized and accelerated by the honeycomb wheel 3, and is transferred from the discharge port 4b to the air-water separation chamber F.
+de water pipe 11→pressure tank 1 flows into the pipe, water intake g10 and the air in the intake channels B, i')a are sequentially sucked in and become negative pressure, the self-priming action is completed and the well water flows into the water intake pipe 10 → Suction channel B, F) c → Reverse old city valve chamber 5b
Suction channel A, 5a4 pump room → Air water chamber part Air water separation room 5d →
Water pipe 11 → enters pressure tank 1. When the water level in the pressure tank 1 reaches a predetermined water level t after water is pumped into the pressure tank 1 one after another, the pressure in the pressure tank 1 rises by a predetermined value t, so the pressure switch opens and the electric motor 2 is driven. 2 stops, inside the pump chamber, suction channel A,! ') The water in the check valve chamber 5b inside the check valve chamber 5b attempts to flow back into the suction pipe 10 through the suction channels B and 5e, but the backflow valve 9 rapidly descends due to its own weight and the pressure of the backflow water. The body 9b comes into pressure contact with the valve seat 6 to prevent water from flowing back. For this reason, the reverse valve chamber 5b, the suction channel A,
The inside of the fia, the pump room, the air-water separation room 5d, and the water pipe 11 are filled with well water.

state. When the water tap is opened in this state, the water in the pressure tank 1 is discharged from the water tap via the discharge pipe 16, and the amount of water in the pressure tank 1 gradually decreases until the water in the pressure tank 1 is discharged.
When the water level inside falls to a predetermined value, the pressure switch is closed, the electric motor 2 is started again, and the water is pumped into the pressure tank 1 again along the above-mentioned path.

Conventional electric pumps of this type are configured and operate as described above, but this type of electric pump is often installed outdoors, especially in winter when the ambient temperature of the electric pump is below freezing. Therefore, when the operation of the electric pump is stopped and the water in the electric pump is in a stationary state, the water in the pump room, self-priming case 5-1 water pipe 11, and pressure tank 1 freezes. The electric pump could be damaged due to an approximately 9% volumetric expansion of water. Note that the freezing order is based on the size of the heat capacity (A) and the order of the heat conductivity (λ), so in this type of electric pump, the water in the pump chamber generally freezes first, and then the water in the suction channel A. , F, a, check valve chamber 5b
, the water in the suction channels B and 5c, and the water suction pipe 10 freeze, and then the water in the water pipe 11 - the air-water separation chamber 5d -> the water in the pressure tank 1 freezes in this order. Even if the water in the pressure tank 1 freezes, there is a considerable volume of air in the pressure tank 1, so the trapped air acts as a damper and there is almost no damage to the pressure tank 1, but the pump case is extremely uneconomical. There was also a major drawback in that water could no longer be used. - This invention has been made in an attempt to eliminate such deficiencies, and one embodiment of this invention will be explained in detail with reference to FIG. In the figure, 5e is the priming port provided in the air/moisture supply 5d. 8 is an embolus that is removably connected to the priming port 5e, and is detached from the priming port 5e until the electric pump completes self-priming. 18 is a bag-shaped absorbent body having a predetermined volume made of elastic synthetic resin foam, etc., which is connected to one end of the embolus 8. Pump casing 4 due to freezing of the discharge 804b side of casing 4, etc.
In order to prevent such damage, when the embolus 8 is connected to the priming port 5e, it is suspended within the air-water separation chamber 5d. Further, when the water in the steam/water separation chamber 5d freezes and the volume of this water expands by about 9%, it is formed to be flexible and resilient so as to absorb this expansion.

Remove from the priming port 5e and through female screw 5g and remove the priming port 5.
After injecting a predetermined amount of priming water from e and connecting only the stopper 7 to the through female thread 5g, when the operation switch of the electric motor 2 is turned on, the rotor shaft and the spring base 8 rotate. When the spring base 8 rotates, the pump chamber, suction channels A, 5B, and check valve chamber 5b sequentially become negative pressure, and the air in the air/water separation chamber 5d is pumped out of the self-priming case 5 through the priming port 5e. Ru. In addition, since the pump chamber, suction channel A, 5a, and backflow valve chamber 5b sequentially become negative pressure,
The reverse valve 9 is guided by the bottomed hole 7a and rises, and the valve body 9b is separated from the valve seat 6, and the air in the suction channels B, 5c and the water suction pipe 10 mixes with the breath water and enters the pump chamber. The air flows in, is pressurized and accelerated by the rotation P of the splash base 3, and is diffused from the discharge port 4b-4 to the air/water separation chamber 5d→priming port 5e→outside air t. On the other hand, the discharge 804b→・Air-water separation chamber 5d→Water pipe 11→Inflow into the pressure tank 1→Suction channel B, 5c−Reverse city valve chamber 5b→
Suction channel A, 5a4 pump room-air-water separation room 5d → water pipe 1
1 → T water is pumped up in the pressure tank 1. Note that until the self-priming action is completed, the embolus 8 is separated from the priming port 5e and leaks, but since the priming port 5e is provided at a position away from the direction of the centrifugal force of the spring base 3, the priming water does not flow through the self-priming case 5. No scattering outside). After the self-priming action is completed, when the embolus 8 to which the absorber 18 is attached is connected to the priming port 5e, the absorber 18 is suspended and immersed in water in the air-water separation chamber 5d. Now, assuming that the volume of water in the steam/water separation chamber 5d is 1 oocc, the volume expansion of this water due to freezing is approximately 996, so the volume after freezing is 100 x 0.09 = 9 cc. On the other hand, absorber 1
The volume of the absorber 18 is approximately 15 cc, and the foaming rate η = 1 of the absorber 18.
---1-60%, the air content α of the absorber 18 = 15x0.6 = 9cc. However, m = the specific gravity of the absorbent body 18 when stretched, and D = the specific gravity of the material of the absorbent body 18 before foaming. Further, if the water in the steam/water separation chamber 5d freezes and expands in volume, and the volume of the absorber 18 becomes 100, that is, 5
If L = 1.8 cc, the amount of contraction of the absorber 18 = 9-1.8 = 7.2 cc.

Next, when the water in the steam/water separation chamber 5d freezes and expands in volume, the water pipe 11 is pushed toward the pressure tank i, and the water pipe 1
If the upper opening of the pressure tank 1+IIIt is moved to an extent of X without leaving the air/water 9f separate room 5d, the volume of movement of the water pipe 11 in this area will be approximately 4°5 cc. That is, the absorber 18 and the pressure tank 11-1 of the water pipe 11 move and the absorber 4*=7.2+4. F)=11.7C
Since the volume expansion of 9 cc due to freezing of the water in the air/water separation 5d can be sufficiently absorbed, damage to the pump room, self-priming case, water pipes, etc. due to freezing can be prevented.

As explained above, this invention includes a pressure tank, a pump casing, a self-priming case having a priming port in a steam/water separation chamber, a backflow valve chamber, and a water separation chamber, and a space between the pressure tank and the steam/water separation chamber.
In this self-priming electric pump, which is connected in a water-tight manner and is separated by a water pipe that can be moved to the pressure tank side, the priming port is placed in a position that prevents the priming water from scattering outside the self-priming case during self-priming, and an elastic After the self-priming of the electric pump is completed, an embolus having an absorbent body made of a foam that can be restored at one end is connected to the priming water port, and when the electric pump freezes, the volumetric expansion of water is transferred to the absorber. Since the structure is such that the water is absorbed by the movement of the water pipe on the pressure tank side, the form and dimensions of the self-priming electric pump have been reduced from those of this type in the past. (The small absorber sufficiently prevents damage caused by freezing, improves self-priming performance, and reduces priming water from leaking outside the machine. It has an excellent practical effect when it comes to taking pictures without using it.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventionally known self-priming electric pump, and FIG. 2 is a cross-sectional view showing a simple embodiment of the present invention. In the figure, 1 is a pressure tank, 2 is an electric motor, 3 is a fly wheel,
4 is a pump casing, 5 is a self-priming case, 5a is a suction channel A, and 5b is a reverse valve chamber. 5C is the suction channel B, 5d is the air-water separation chamber, 5e is the priming port, 7
is a plug, 8 is an embolus, 9 is a reverse valve, 11 is a water pipe, 12.1
4 is an O-ring holder, and 18 is an absorber. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno - Figure 7 Figure 2

Claims (2)

[Claims] (1) A pressure tank, an electric motor connected to this pressure tank, a pump casing connected to this electric motor, a self-priming case connected to the casing, and an air pump formed in this self-priming case and having a through hole. A water separation chamber, a water pipe that airtightly communicates the air/water separation chamber with the inside of the pressure tank and is movable toward the pressure tank, and an absorber made of elastic foam are connected to one end. and an embolus that suspends the absorber in the air-water separation chamber when the injection hole C is connected, and the embolus is connected to the through hole after the self-priming action of the pump. Features: Self-priming electric pump. (2) The self-priming type according to claim 1, characterized in that the through hole is arranged at a position where the priming water does not scatter outside the self-priming case from the air-water separation layer during self-priming. electric pump.