JPH109121A - Pump device and absorption refrigerator using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the costs of a pump device by arranging two pressure- receiving faces of different sizes as to oppositely face from each other in the driving directions of a shaft part, which larger pressure-receiving face alternately receives fluid of different pressures through a plurality of valves arranged in parallel with each other while which smaller pressure-receiving face continuously receives fluid of high pressure. SOLUTION: When an electric motor 10 of a drive body 1 is driven, a rotary shaft 11 rotates to rotate a disk 12 together. A guide frame 13 receives forces of which directions and magnitudes are momentarily varied from the inscribed rotating disk 12, but reciprocates because of the restriction in its moving directions by a pair of parallel sliding guides 14. Since pistons 20 and 30 are fixed to the guide frame 13 as to oppositely face from each other, when the piston 20 retreats the piston 30 advances, while when the piston 20 advances the piston 30 retreats. The transfer of fluid on the lower-pressure side to the higher-pressure side through pressurization with a smaller force reduces the size of the drive to reduce the initial costs therefor as well as the running costs therefor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump device that can be driven with low energy consumption, and an absorption refrigerator configured to transfer a solution from an absorber to a generator by the pump device.

[0002]

2. Description of the Related Art An absorption refrigerator having the structure shown in FIG. 5 and using ammonia as a refrigerant and water as an absorption liquid has been conventionally known. In this ammonia absorption refrigerator, a generator 92 having a heating means 91 such as a gas burner is provided.
To heat the solution to separate the refrigerant by evaporation.

The refrigerant vapor generated by the generator 92 is radiated and condensed by a condenser heat exchanger 93 flowing through a refrigerant pipe L1 to a brine (not shown), and is condensed.
After the pressure is reduced in step 4, the refrigerant reaches the evaporator heat exchanger 95, where it absorbs heat from brine (not shown) and evaporates, and the refrigerant pipe L3
Flows into the absorber 96 via the.

On the other hand, the dilute liquid whose refrigerant concentration has been reduced by evaporating and separating the refrigerant in the generator 92 flows into the absorber 96 via the pressure reducing valve 97 of the dilute liquid pipe L4, where the evaporator heat exchanger 9
5 absorbs the refrigerant vapor flowing from it and becomes a concentrated liquid, and is returned to the generator 92 by the solution pump 98 via the concentrated liquid pipes L5 and L6.

[0005] Cooling / heating is performed using one or both of the brine heated by the heat radiation of the refrigerant in the condenser heat exchanger 93 and the brine cooled by the heat absorption of the refrigerant in the evaporator heat exchanger 95. And so on.

[0006]

However, in the conventional absorption refrigerator described above, since the solution pump is driven only by the electric motor, it is necessary to install a large electric motor of several hundred watts or more. However, there is a problem that the initial cost and the running cost are high. There is also a demand for extending the service life of the pump device, and solving these problems has been an issue.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention relates to a pump device in which two pressure receiving surfaces having different sizes are mounted on a shaft portion which is driven reciprocally. Are mounted in opposite directions to each other and in accordance with the driving direction of the shaft portion, and a large pressure receiving surface is configured such that fluids of different pressures can alternately act on a large pressure receiving surface through a plurality of valves installed in parallel. A pump device having a first configuration in which a high-pressure fluid always acts on a pressure-receiving surface;

[0008] In the pump device of the first configuration, the plurality of valves are check valves, and the pump device of the second configuration is installed in the opposite direction.

In an absorption refrigerator in which a generator cycle, a condenser heat exchanger, an evaporator heat exchanger, and an absorber are connected to form a refrigerant cycle and a solution cycle, the solution in the absorber is the first type.
Or connecting the absorber and one valve of the pump device so as to reach a large pressure receiving surface of the pump device of the second configuration,
The generator is connected to the remaining valve of the pump device so that the solution acting on the large pressure receiving surface can flow into the generator, and the high-pressure fluid is supplied to the pump device via a pipe extending from the generator. And an absorption refrigerator having a configuration connected so as to always act on a small pressure receiving surface.

[0010]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described in detail with reference to FIG. In addition, in order to facilitate understanding, in these figures, parts having the same functions as the parts described in FIG. 5 are denoted by the same reference numerals.

Reference numeral 100 denotes a pump device of the present invention. The pump device 100 includes a drive main body 1 composed of an electric motor 10 and the like, and a piston 20 having a relatively small pressure receiving surface, ie, a top surface, which receives pressure. And an operating unit 3 including a piston 30 having a relatively large top surface area.

The drive main body 1 includes an electric motor 10, a rotating shaft 11 that is linked to a rotating shaft (not shown) of the electric motor via a speed reducer, a disk 12 mounted eccentrically to the rotating shaft, A guide frame 13 in which the disk is inscribed, a pair of parallel sliding guides 14 in which the guide frame is inscribed, and a connection that is aligned with the guide direction of the slide guide and is linearly attached to both side surfaces of the guide frame 13 It consists of rods 15 and 16.

The piston 20 is attached to the end of one connecting rod 15 and the piston 30 is attached to the end of the other connecting rod 16.
1 and 31 are slidably housed.

The cylinder 21 which constitutes the auxiliary drive unit 2 together with the piston 20 has a cylinder chamber 22 on the side where the connecting rod 15 is not provided, and has an outflow / inflow port 23 for fluid at the end of the cylinder chamber.

The cylinder 31, which constitutes the operating portion 3 together with the piston 30, has a cylinder chamber 32 on the side where the connecting rod 16 is not provided, and the pressure of the cylinder chamber 32 (hereinafter referred to as internal pressure) is provided at the end of the cylinder chamber. ) Opens when the internal pressure drops below the external pressure and closes when the internal pressure rises above the external pressure, and closes when the internal pressure drops below the external pressure. And a fluid outlet 35 with a check valve 36 that opens when the internal pressure rises above the external pressure.

In the pump device 100 of the present invention having the above-described structure, the rotating shaft (not shown) is rotated by driving the electric motor 10 of the driving main body 1, and the rotating shaft 11 is rotated in conjunction with the rotating shaft. Therefore, the disk 12 also rotates. The guide frame 13 receives a force whose direction and size change every moment from the inwardly rotating disk 12, but the direction in which the guide frame 13 can move is regulated by the pair of parallel sliding guides 14. After all, reciprocating operation is performed.

Moreover, the pistons 20 and 30 are
3, when the piston 20 is retracted and the internal volume of the cylinder chamber 22 is increased, the piston 30 advances and the internal volume of the cylinder chamber 32 is reduced, and Moving forward, cylinder chamber 22
When the internal volume of the cylinder 30 is decreasing, the piston 30 retreats and reciprocates in each cylinder so that the internal volume of the cylinder chamber 32 increases.

For this reason, for example, the outlet 23 and the outlet 3
5 is connected to the high pressure side of the pressure P _H and the inflow port 33 is connected to the low pressure side of the pressure P _L to start the electric motor 10 so that the pistons 20 and 30 reciprocate. ,
The driving force of the electric motor 10 is F, the pressure receiving surface of the piston 20 is
That is, the area of the top surface is S ₂ , the pressure receiving surface of the piston 30, that is, the area of the top surface is S ₃ ,
Assuming that the sliding resistance of the cylinders 0 and 21 with respect to the cylinders 21 and 31 is f, the internal volume of the cylinder chamber 22 decreases,
Increasing the internal volume of the piston 20, 30 in the direction pressure to the cylinder chamber 32 may flow from the inlet port 33 through the low pressure fluid check valve 34 of the P _L is operating (hereinafter,
This process is called a suction process), and the following equation must be satisfied.

P _L · S ₃ + F> P _H · S ₂ + f That is, F> P _H · S ₂ -P _L · S ₃ + f (1)

On the other hand, the internal volume of the cylinder chamber 22 increases,
The internal volume of the cylinder chamber 32 is reduced, the piston 20, 30 in a direction in which the pressure can flow out into the high pressure side of the P _H fluid in the cylinder chamber 32 through the check valve 36 from the outlet 35 is operating At this time (hereinafter, this process is referred to as a discharge process)
The following equation must be satisfied.

P _H · S ₃ + f <P _H · S ₂ + F That is, F> P _H (S ₃ -S ₂ ) + f (2)

For this reason, for example, S ₂ = 25 cm ² , S ₃
= 50 cm ² , f = 100N, and the concentrated liquid in the absorber 96 of the absorption refrigerator is allowed to flow into the cylinder chamber 32 with the absorber 96 as shown in FIG. 2, for example. The inlet 33 is connected via a concentrated liquid pipe L5, and the outlet 35 and the generator 92 are connected via a concentrated liquid pipe L6 so that the concentrated liquid in the cylinder chamber 32 can flow into the generator 92. When the outlet 23 and the high-pressure side of the refrigerator, that is, the generator 92 side, are connected by any of the high-pressure pipes L7, L8, and L9, a pressure of about 2 MPa is applied to the outlet 23 and the outlet 35 during operation of the refrigerator. Act, inlet 3
Since a pressure of about 0.4 MPa acts on 3, the driving force F required of the electric motor 10 in the suction stroke of sucking the concentrated liquid in the absorber 96 into the cylinder chamber 32 is given by the following equation (1). F> 3100N, and in the discharge stroke of supplying the concentrated liquid in the cylinder chamber 32 to the generator 92, the electric motor 10
The driving force F required for the motor is expressed by the equation (2) as F> 5100N
Is required.

On the other hand, a conventional pump without the auxiliary drive unit 2
In the loop device, S_Three = 0, so during the suction stroke
The driving force F required for the electric motor 10 is given by the following equation (1).
−P _L ・ S_Three + F is deformed and exceeds -1900N
Force is required and required by the electric motor 10 during the discharge stroke.
The driving force F is given by the following equation (2): F> P_H ・ S_Three + F and deformation
Requires an extremely large force exceeding 10100 N
You can see that

As described above, since the electric motor 10 in the pump device 100 of the present invention only needs to have a driving force exceeding 5100 N, the size of the electric motor 10 can be reduced as compared with the conventional pump device. Power consumption can also be reduced.

The driving force F required for the electric motor 10 varies as shown in FIG. 3, and in the conventional pump device without the auxiliary drive unit 2, backlash occurs during the suction stroke as shown by the broken line. On the other hand, in the pump device 100 of the present invention, as shown by the solid line, no backlash occurs even in the suction stroke, so that the fluctuation of the force applied to the rotating shaft of the electric motor 10 is suppressed, and the fluctuation of the rotation speed is also reduced. Since the number of components is reduced, the occurrence of abrasion of the contact portions and the occurrence of rattling of the components are suppressed, and damage to the coil and the like are also suppressed.

Since the present invention is not limited to the above-described embodiment, various modifications can be made without departing from the scope of the claims.

For example, the pistons 20 and 30 can be replaced by a diaphragm structure as shown in FIG. In the figure, reference numeral 20a denotes a driving chamber 2 corresponding to the cylinder chamber 22.
A diaphragm 30a is provided in place of the piston 20 facing the working chamber 32a corresponding to the cylinder chamber 32, and a diaphragm 30a is provided in place of the piston 30 facing the working chamber 32a. By connecting the outlet 35 in the same manner as in FIG. 1 described above, the driving force of the electric motor 10 when sucking the low-pressure fluid into the working chamber 32a and pressurizing it to discharge it to the high-pressure fluid is applied to the diaphragm 20a. The pressure on the high-pressure side can be reduced as in the case of the pistons 20 and 30.

The cylinder chambers 22 and 32 can be provided on the side where the connecting rods 15 and 16 are located.

[0029]

As described above, according to the pump device of the present invention, the fluid on the low pressure side can be pressurized with a small force and conveyed to the high pressure side. It is possible to reduce the initial cost by reducing the size and to reduce the running cost.

Further, since backlash does not occur even in the suction stroke, fluctuations in the force applied to the rotating shaft of the driving device are suppressed, and fluctuations in the rotation speed are reduced, so that the contact parts are worn and the constituent parts are rattled. Occurrence is suppressed and the life of the device can be extended.

Therefore, by using this pump device as a solution pump for transferring a solution from a low-pressure absorber to a high-pressure generator, it is possible to provide an absorption chiller that is compact, energy-saving, and has a long life. It has become possible.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a pump device.

FIG. 2 is an explanatory view of an absorption refrigerator.

FIG. 3 is an explanatory diagram showing a change in driving force.

FIG. 4 is an explanatory view of a modified embodiment.

FIG. 5 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive main body part 2 Auxiliary drive part 3 Actuating part 10 Electric motor 11 Rotary shaft 12 Disk 13 Guide frame 14 Sliding guide 15.16 Connecting rod 20 Piston 20a Diaphragm 21 Cylinder 22 Cylinder chamber 22a Drive chamber 23 Outflow inlet 30 Piston 30a Diaphragm Reference Signs List 31 cylinder 32 cylinder chamber 32a working chamber 33 inflow port 34 check valve 35 outflow port 36 check valve 91 heating means 92 generator 93 condenser heat exchanger 94 expansion valve 95 evaporator heat exchanger 96 absorber 97 pressure reducing valve 100 Pump device L1, L2, L3 Refrigerant pipe L4 Dilute liquid pipe L5, L6 Concentrated liquid pipe L7, L8, L9 High pressure pipe

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tomohiko Kato 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (3)

[Claims] 1. A pump device in which two pressure receiving surfaces having different sizes are attached to a reciprocatingly driven shaft portion, wherein the two pressure receiving surfaces are opposite to each other and in a driving direction of the shaft portion. It is configured so that fluids of different pressures can work alternately on a large pressure receiving surface via a plurality of valves installed in parallel, and high pressure fluid can always operate on a small pressure receiving surface. A pump device characterized by the above-mentioned. 2. The pump device according to claim 1, wherein the plurality of valves are check valves and are installed in opposite directions. 3. An absorption refrigerator in which a generator cycle, a condenser heat exchanger, an evaporator heat exchanger, and an absorber are connected to form a refrigerant cycle and a solution cycle, wherein the solution in the absorber is 1 or 2) connecting the absorber to one valve of the pump device so that the solution acting on the large pressure receiving surface of the pump device according to 2 can flow into the generator;
The generator is connected to the remaining valve of the pump device, and a high-pressure fluid is connected via a pipe extending from the generator so as to always act on a small pressure-receiving surface of the pump device. Absorption refrigerator.