JPS5820990A - Pump used for conveying liquid under pressure - Google Patents

Abstract

PURPOSE:To impart a liquid conveying pump with functions for separating air from liquid releasing the separated air to the outside, by forming an air separating chamber communicated with both of the pump head and a discharge chamber, and forming a vent hole at position upper than the air separating chamber with respect to the specific gravity, pump head and the discharge chamber. CONSTITUTION:In a pump 1 of this invention, an air separating chamber 9 is formed upwardly of an impeller 3. When air bubbles are produced, they rise upward in the chamber 9 by the function of buoyancy and are separated from water, so that occurrence of ''air lock'' is prevented. Air thus separated from water and collected at an upper region of the chamber 9 is carried promptly through an air passage 14 into an air chamber 17 in a deaerating valve 12 and collected in the air chamber 17. When the water level in the air chamber 17 is lowered, a float 16 is also lowered and a valve body 15 is disengaged from a vent hole 18, so that air collected in the air chamber 17 is relesed to the atmosphere. Thus, air releasing function can be achieved effectively through co-operation of the air separating chamber 9 and the float valve, and the pump is imparted with both of the functions for separating air from water and releasing the separated air to the atmosphere.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid pressure pump, and more particularly to a pump suitable for use in a heating hot water supply system or the like.

In general, conventional liquid pressure pumps used in heating hot water systems, etc., do not include a pump head equipped with a rotating impeller, a suction chamber and a discharge chamber that communicate with this head, and the pump itself. It does not have a deaeration function. For this reason, when air bubbles circulate in the impeller, an aerodynamic phenomenon occurs and water supply is likely to become impossible, and countermeasures such as special degassing maintenance work have been taken, but these measures However, there are drawbacks such as poor maintainability.

By the way, normally, in a circulating waterway such as a hot water supply system for heating, when air remains in the piping, it is necessary to quickly discharge the air to the outside. This is to prevent water flow from being deteriorated due to accumulated air and problems such as corrosion and erosion of the pipes from occurring. Therefore, when there is no atmospheric pressure open water surface in the circulation waterway that can release the accumulated air to the outside, conventionally, a gas-liquid separator is interposed in the middle of the circulation waterway, and a deaeration valve is installed in this separator. However, the necessity of such ancillary equipment has drawbacks such as increased equipment costs for the entire system and poor maintainability.

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid pressure pump having a gas-liquid separation function and a deaeration function, thereby solving the drawbacks of the prior art at once.

By providing a gas-liquid separation chamber that communicates with the pump head and the discharge chamber, and installing a deaeration hole in this separation chamber, the liquid pressure pump itself has a gas-liquid separation function and a deaeration function. This is what is given.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In FIG. 1, there is shown a pump 1#i for pumping liquid, and a pump head 2 housing an impeller 3 that pumps liquid by rotation. In the upper part of the head 2, there are a suction chamber 5 communicating with the suction side of the impeller 3 via a suction passage 6, and a discharge chamber 8 communicating with the discharge side of the impeller 3 via a discharge passage IO. and are provided adjacent to each other. A suction pipe 4 is detachably connected to the suction chamber 5, and a discharge pipe 7 is detachably connected to the discharge chamber 8Kt. KFi between the discharge passage 10 and the discharge chamber 8
A gas-liquid separation chamber 9 is interposed so as to communicate with both 1O18, and the separation chamber 9, the discharge chamber 8, and the suction chamber 5 are integrally formed by the Herad chamber 11. The separation chamber 9 is disposed above the pump head 2 and the discharge chamber 80 with respect to gravity, so that it can form an air retention space. There is a mounting hole 1 at the top of the separation chamber 9.
3 is formed, and the d1 degassing valve 12 is removably screwed into the attachment hole 13, and water can be poured into the separation chamber 9 with the degassing valve 12 removed through the attachment hole 13#'i. It becomes like this φ
Ru. A vent passage 14 is formed in the lower part of the degassing valve 12, and this vent passage 14 can lead air bubbles from the separation chamber 9 to the space above the degassing valve 12.

An air chamber 17 is formed above the degassing valve 12, and a degassing hole 18 is formed at the top of the air chamber 17 so as to communicate with the atmosphere. The water in the separation chamber 9 can be introduced into the lower part of the air chamber 17 through the ventilation path 14, and a 70-tooth 16 is accommodated in the water surface S so as to be responsive to the water. A valve body 15 is protruded from the upper part of this float 16, and this valve body 1
5 can open and close the deaeration hole 18. Note that the arrow WFi indicates the water flow.

The effects of the liquid pressure pump according to the above configuration will be explained.

Normally, the pump 1 achieves a pumping action even when air is mixed in the liquid in the form of bubbles, but if the air is not separated, the proportion of air will gradually increase, and the water flow around the impeller 3 will be interrupted, causing an aerodynamic phenomenon. occurs, making it impossible to pump water. However, since the pump 1 has a gas-liquid separation chamber 9 above the first impeller 3, the air becomes bubbles in the separation chamber 9, rises in the water due to its buoyancy, and is separated from the water. Therefore, the proportion of air is prevented from increasing, and the occurrence of the aerodynamic phenomenon is prevented.

The air that has been separated into gas and liquid and has reached the upper part of the separation chamber 9 is quickly guided to the air chamber 17 in the degassing valve 12 through the air passage 14 communicating therewith, and remains in the air chamber. When the water level in the air chamber 17 falls, the float 16 descends and the valve body 15 opens the deaeration hole 18, so that the stagnant air is discharged from the deaeration hole 18 to the atmosphere. Therefore, more than a certain amount of air does not remain in the air chamber 17, and the deaeration effect is effectively achieved by the cooperation of the separation chamber 9 and the float valve.

In this way, according to the embodiment, the separation chamber 9 is connected to the impeller 3.
It has the effect of preventing the aerodynamic phenomenon and the effect of promoting deaeration. This company exhibits a synergistic effect that cannot be obtained when the gas-liquid separation means and the deaeration means are provided in a thread path other than the pump 1.

By the way, remove the deaeration valve 12 from the separation chamber 9 and install it at the installation port 13.
Since the separation chamber 9 and the pump head 2 can be filled with water by injecting water from
It is possible to create a condition in which the air in the circulation waterway system can be discharged, making test runs and maintenance work of the waterway system extremely easy.

In the past, a special manual knob or the like was used in the waterway system to exhaust the air in the system. FIG. 3 shows a piping diagram thereof.

A heating system 21#'i as a heat pump device is housed in a box body 22, and includes a refrigeration cycle and a controller 28. The refrigeration cycle includes a compressor 23 and an expansion valve 24
, condenser 25, evaporator 26, circulation! The controller 28 is equipped with a pump 27 and has functions such as controlling the refrigeration cycle and transmitting and receiving control signals to and from other elements of the heating and hot water supply system. Well water pumped up by a well pump 31 from a pumping well 30 is supplied to the evaporator 26 , and is drained to the ring source well 32 . In the refrigeration cycle, the refrigerant pressurized by the compressor 23 is condensed in the condenser 25, and the water passing through the condenser 25 is heated to generate hot water, which is then depressurized in the expansion valve 24 and sent to the evaporator. The well water passing through the well water is evaporated at 26 and cooled, and then returned to the compressor 23 for circulation. The hot water heated by the condenser 25 heats a fan coil 35 or a hot water tank 36 installed indoors by switching solenoid valves 33 and 34. This hot water is forcibly circulated by the circulation pump 27 through the fan coil 35 when the solenoid valve 3 is opened, and through the hot water tank 36 when the solenoid valve 34 is opened. A temperature sensing tube 38 of a temperature relay 37 is attached to the water channel on the outlet side of the condenser 25, and is controlled to maintain the hot water temperature from 42 to 500, for example, without heating. Pressure from the gas tank 39 is applied to the hot water tank 36, and this pressure causes the faucet 40 to open.
Hot water can be supplied from

In the heating and hot water supply system configured as described above, one liquid pressure pump according to an embodiment of the present invention is used for the circulation pump 27 and the well pump 31, respectively. That is, both pumps have a gas-liquid separation chamber, a deaeration hole, and a deaeration valve 12 (only the deaeration valve 12 is shown in FIGS. 2 and 3) equipped with a valve body for opening and closing the deaeration hole. are provided respectively i
Ru.

In the circulation pump 27, the condenser 25. fan coil 3
5. The air in the hot water tank 36 and the waterway containing it is quickly exhausted by the deaeration valve 12.

Therefore, the heat exchange capacity decreases due to air accumulation in the condenser 2-5 and fan coil 35, the capacity decreases due to air accumulation in the hot water storage tank 36, and the generation of so-called stale water due to air blowing from the faucet 40. and degassing valve 1
This can be prevented with only 2.

Further, in the well pump 31, the air in the water channel including the evaporator 26 is quickly exhausted to the degassing valve 12. Therefore, it is possible to prevent a decrease in the heat exchange capacity due to air accumulation in the evaporator 26 and an increase in the proliferation of bacteria due to the dissolved air sent in by the reduction well 32, thereby preventing corrosion, erosion, etc. of the piping etc. due to the presence of air. can also be completely prevented.

Furthermore, in the initial stage of operation, simply removing the deaeration valve 12 and discharging water to each pump 27.31 allowed air to be discharged and water to be continued without providing any particular air discharge means in the waterway system. Able to carry out driving. Furthermore, even if air intrudes from a pipe due to leakage, etc., if the amount of air is less than the deaeration capacity of the deaeration valve 12, the operation of the entire system will continue to some extent. It is possible.

In the above embodiment, the liquid pressure pump according to an embodiment of the present invention is applied to a heating and hot water supply system, but the present invention is not limited to this and can be applied as a liquid pressure pump in any field. .

As explained above, according to Himi EA, since the liquid pressure pump itself has a gas-liquid separation function and a deaeration function,
It is possible to simultaneously prevent the occurrence of a near-nick phenomenon in the impeller and deaerate the piping system using a single means and a simple structure.

[Brief explanation of the drawing]

Fig. 1 is a -g section front view showing one embodiment of the present invention;
The figure and FIG. 3 are a perspective view and a piping diagram showing an example of its application. 1...Liquid pressure pump, 2...Pump head%3
...Impeller%5...Suction chamber, 8...-Discharge chamber, 9-
...gas-liquid separation chamber, 12--deaeration valve, 13--installation port, 14--ventilation path.

Claims (1)

[Claims] 1. A liquid pressure pump comprising a pump head equipped with a rotating impeller, and a suction chamber and a discharge chamber communicating with the head, each of which includes a gas-liquid separation chamber communicating with the head and the discharge chamber, A liquid pressure pump characterized in that the head of the separation chamber and the discharge chamber are also provided with a deaeration hole communicating with the atmosphere at an upper position relative to gravity.