JPH06117381A - Refrigerant pump - Google Patents

Abstract

PURPOSE:To shift the refrigerator oil collected in a sealed container equipped with a pump body built in, outside the sealed container. CONSTITUTION:Since a small hole 28 for discharging the refrigerator oil is formed in the vicinity of the bottom surface of a sealed container for a suction pipe 22 or discharge pipe 21 which is fixed on the sealed container 15, the refrigerator oil flows outside the sealed container from the small hole 28, even if refrigerant and the fefrigerator oil leak into a refrigerant pump during the cooling operation, and the stay of the refrigerator oil having high concentration on the bottom surface of the sealed container is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submerged refrigerant pump used in a heating / cooling machine having a refrigerant heating function by combustion, and more particularly to a mechanism for removing refrigerating machine oil accumulated in a storage container.

[0002]

2. Description of the Related Art Having a conventional refrigerant heating function by combustion,
A refrigerant circuit configuration of a heating / cooling machine having heat transfer means by a refrigerant pump will be described with reference to FIG. The entire system has a configuration in which a refrigerant heating unit for combustion is inserted in a refrigerant circuit of a general air conditioner. Reference numeral 40 denotes an outdoor unit, which is an outdoor heat exchanger 43 from a compressor 41 via a four-way valve 42.
Through the capillary tube 44 and the solenoid valve 45, from the indoor heat exchanger 47 of the indoor unit 46 to the solenoid valve 48,
A four-way valve 42 is used to make a cycle of the accumulator 49 of the compressor 41, and a heater 50 is passed through a check valve 51 and an indoor heat exchanger 47 of the indoor unit section 40 is operated with a solenoid valve 5.
It is composed of a heating cycle from 2 to the refrigerant pump 53.

In FIG. 7, the refrigerant pump 53 has a submerged type construction, and a vortex type pump main body 55 is built in a closed container 54. The pump body 55 is the discharge pipe 5.
6 is above and the suction port 57 is below the pump body 55,
The discharge pipe 56 is the O of the discharge part 58 fixed to the closed container 54.
It is inserted into the ring 59 to keep it airtight. The pump main body 55 is fixed to the bottom of the closed container 54 together with a filter 60 fixed integrally with the pump main body 55 in front of the suction port 57. A suction pipe 61 is brazed to the closed container 54 and opens above the closed container 54. Electric power is supplied to the power supply terminal 62 of the pump body 55 from the hermetically sealed terminal 63 through the lead wire 64.

The refrigerant pump 53 sucks the refrigerant flowing from the suction pipe 61 into the pump body 55 through the suction port 57, pressurizes it, and discharges it through the discharge pipe 56 into the refrigerant circuit.

[0005]

However, in the above-mentioned conventional configuration, the refrigerant and the refrigerating machine oil leak from the check valve 51 or the electromagnetic valve 52 into the closed container 54 during the cooling operation, etc. The machine oil was accumulated on the bottom surface of the closed container 54. Intake port 5 of pump body 55
Since 7 is installed near the bottom surface of the closed container 54 due to its structure, the pump main body 55 sucks refrigerating machine oil if it is started in this state. Since the refrigerating machine oil has a very high viscosity, it cannot be started by the pump main body 55 having a very small torque as compared with the compressor 41 and the like. was there. Especially in cold regions, when the outside air temperature is low, the viscosity of the refrigerating machine oil also becomes very high, and it was even more important to solve this problem.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to move refrigerating machine oil accumulated in a closed container containing a pump body to the outside of the closed container.

[0007]

In order to achieve the above object, the present invention provides a suction pipe or a discharge pipe fixed to a closed container with a small hole for discharging refrigerating machine oil at a position near the inner bottom surface of the closed container. It has a different structure.

[0008]

According to the present invention, even if the refrigerating machine oil is accumulated in the closed container according to the above-mentioned structure, the refrigerating machine oil is gradually discharged from the small hole for discharging the refrigerating machine oil provided in the suction pipe or the discharge pipe fixed to the closed container. Stable pump start-up can be performed without refrigerating machine oil accumulating in the closed container.

Further, during the heating operation, the refrigerant is jetted from the small hole provided in the discharge pipe to agitate the refrigerant and the refrigerating machine oil near the bottom surface of the hermetic container, so that the refrigerating machine oil circulates in the system together with the refrigerant and the hermetic container Stable pump start-up can be performed without refrigerating machine oil accumulating in the.

[0010]

Embodiments of the present invention will be described below with reference to FIGS.

The entire system has a structure in which a refrigerant heating section for combustion and a refrigerant heat transfer section are inserted in a refrigerant circuit of a general air conditioner. Reference numeral 1 denotes an outdoor unit, a compressor 2, a four-way valve 3, an outdoor heat exchanger 4, a capillary tube 5, a solenoid valve 6, an indoor unit 7, an indoor heat exchanger 8, a solenoid valve 9, and a four-way valve 3. Further, the cooling cycle and the heater 11 that make one round in the accumulator 10 of the compressor 2
Further, it is constituted by a heating cycle in which the check valve 12 is passed through, the indoor heat exchanger 8 of the indoor unit portion 7 is passed through the electromagnetic valve 13, and then the refrigerant pump 14 is passed through.

The refrigerant pump 14 has a submerged type construction, and a vortex type pump main body 16 is built in a closed container 15. The pump body 16 is provided with a discharge port 17 on the upper side and a suction port 18 on the lower side, and the discharge port 17 is fixed to a pipe 19 fixed to the closed container 15 via an O-ring 19A to maintain airtightness. A filter member 20 having elasticity in the pump body 16 is fixed to the pump body 16 and elastically abuts the closed container 15. A filter 20A is fixed to the filter member 20. The suction port 18 of the pump body 16 is installed with a sufficient distance from the bottom surface of the closed container 15 by the filter member 20. The closed container 15 includes a discharge pipe 21, a suction pipe 22 having an opening above the closed container 15, a hermetic seal terminal 24 and a lead wire 25 for supplying power to a power supply terminal 23 of the pump body 16.
Further, a small hole 28 is opened near the bottom surface of the closed container 15 of the suction pipe 22.

The operation of the above structure will be described. During cooling operation, the solenoid valves 6 and 9 are turned on and the four-way valve 3 is turned on.
Is connected from the compressor 2 to the outdoor heat exchanger 4, and the solenoid valve 1
3 is closed to form a refrigerant circuit of a cooling cycle. During the heating operation, the solenoid valves 6 and 9 are turned off, and the solenoid valve 13 is turned on to form a refrigerant circuit of the heating cycle. The refrigerant pump 14 is controlled to a refrigerant circulation amount corresponding to the output of the heater 11. During the cooling operation, the refrigerant and the refrigerating machine oil leak from the solenoid valve 13 or the check valve 12 little by little and flow into the heater 11 and the refrigerant pump 14, but near the bottom of the closed container 15 of the suction pipe 22 of the refrigerant pump 14. Since the small hole 28 is opened in the container, the refrigerating machine oil is replaced with the refrigerant or flows out of the closed container by the action of gravity. Therefore, high-concentration refrigerating machine oil does not accumulate on the bottom surface of the closed container 15.

Next, another embodiment of the present invention will be described with reference to FIGS. This embodiment is different from the previous embodiment in that the discharge pipe 21A is guided to the bottom of the closed container and a small hole 28 is formed near this bottom.
The difference is that A is provided. The refrigerant pump 14 has a submerged type structure, and a vortex type pump body 1 is provided in a closed container 15.
6 is built in. The pump body 16 has a discharge port 17 above and a suction port 18 below the pump body 16, and the discharge port 17 has a discharge pipe 21A having an outlet on the bottom surface of the closed container 15.
Connected with. A filter member 20 having elasticity in the pump body 16 is fixed to the pump body 16 and elastically abuts the closed container 15. A filter 20A is fixed to the filter member 20. The suction port 18 of the pump body 16 is installed with a sufficient distance from the bottom surface of the closed container 15 by the filter member 20. The closed container 15 has a suction pipe 22 having an opening above the closed container 15, a hermetic sill terminal 24 for supplying power to a power supply terminal 23 of the pump body 16, and a lead wire 25. A small hole 28A is formed near the bottom surface of the closed container 15 of the discharge pipe 21A.
Is open.

The operation of the above structure will be described. During cooling operation, the solenoid valves 6 and 9 are turned on and the four-way valve 3 is turned on.
Is connected from the compressor 2 to the outdoor heat exchanger 4, and the solenoid valve 1
3 is closed to form a refrigerant circuit of a cooling cycle. During the heating operation, the solenoid valves 6 and 9 are turned off, and the solenoid valve 13 is turned on to form a refrigerant circuit of the heating cycle. The refrigerant pump 14 is controlled to a refrigerant circulation amount corresponding to the output of the heater 11. During the cooling operation, the refrigerant and the refrigerating machine oil leak from the solenoid valve 13 or the check valve 12 little by little and flow into the heater 11 and the refrigerant pump 14, but near the bottom surface of the closed container 15 of the discharge pipe 21A of the refrigerant pump 14. Since the small hole 28A is opened, the refrigerating machine oil is replaced with the refrigerant or flows out of the closed container by the action of gravity. Therefore, high-concentration refrigerating machine oil does not accumulate on the bottom surface of the closed container 15.

During the heating operation, a small hole 28A is formed near the bottom of the closed container 15 of the discharge pipe 21A of the refrigerant pump 14.
Since the opening is open, the liquid near the bottom surface of the closed container 15 is not agitated and the refrigerating machine oil of high concentration does not accumulate.

[0017]

As is apparent from the above description, the present invention has the following effects.

(1) Since a small hole is opened in the suction pipe or the discharge pipe of the refrigerant pump having the pump body built in the closed container near the bottom of the closed container, the refrigerating machine oil is replaced with the refrigerant or closed by gravity. It flows out of the container. Therefore, high-concentration refrigerating machine oil does not accumulate on the bottom of the closed container,
The refrigerant pump can be easily started even if the outside air temperature is low and the refrigerating machine oil has a high viscosity.

(2) Refrigerant jets from a small hole provided in the discharge pipe to agitate the refrigerant near the bottom surface of the closed container and the refrigerating machine oil, so that the refrigerating machine oil circulates in the system together with the refrigerant and is frozen in the closed container. Stable pump operation can be performed without the accumulation of machine oil.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a heating / cooling system using a refrigerant pump according to the present invention.

FIG. 2 is a schematic sectional view of a refrigerant pump according to an embodiment of the present invention.

FIG. 3 is a partial cross-sectional view of a closed container and a suction pipe in the above embodiment.

FIG. 4 is a schematic sectional view of a refrigerant pump according to another embodiment of the present invention.

FIG. 5 is a partial sectional view of a closed container and a discharge pipe in the above embodiment.

FIG. 6 is a partial sectional view of a conventional refrigerant pump.

FIG. 7 is a configuration diagram of a heating / cooling system of the refrigerant pump.

[Explanation of symbols]

 15 Airtight container 16 Pump body 17 Discharge port 18 Suction port 21A Discharge pipe 22 Suction pipe 28, 28A Small hole

Claims (2)

[Claims] 1. A pump body is built in a closed container, a discharge port is provided above the pump body, and a suction port is provided below the pump body. The suction port is installed with a sufficient distance from the bottom surface of the closed container. A refrigerant pump having a suction pipe communicating with the inside of the closed container, and further having a small hole opened in the suction pipe near the bottom surface of the closed container. 2. A pump body is built in a closed container, a discharge port is provided above the pump body, and a suction port is provided below the pump body. The suction port is installed with a sufficient distance from the bottom surface of the closed container. A refrigerant pump having a discharge pipe connected to the discharge port and having an outlet on the bottom surface of the closed container, and having a small hole opened near the bottom surface of the discharge pipe in the closed container.