JPH09112201A - Pump device and refrigerator therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To pressurize with low power energy and reduce the running cost by incorporating a first valve mechanism opened and closed in accordance with a difference between internal and external pressures, in a fluid inlet port in one end part of a cylinder, and by incorporating a second valve mechanism opened and closed in accordance with a difference between internal and external pressures, in the same end part. SOLUTION: A cylinder 5 slidably incorporating a piston 2 having a top surface whose area is relatively small, defines therein a cylinder chamber 4A and a cylinder chamber 5A which having an internal volume which decreases when the internal volume of the cylinder chamber 4A increases through the reciprocation of the piston 1, but which increases when the cylinder chamber 4A decreases. One end part of the cylinder chamber 5A is formed therein with a fluid inlet port 13 incorporating a check valve V3 which is opened when the internal pressure is lower than the external pressure but is closed when the internal pressure is higher than the external pressure, and is also formed therein with a fluid outlet port 14 incorporating a check valve V4 which is closed when the internal pressure is lower than the external pressure but is opened when the internal pressure is higher than the external pressure. With this arrangement, it is possible to pressurize fluid to a constant pressure by less power energy.

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 in the generator 92 radiates heat to a brine (not shown) flowing through the condenser heat exchanger 93 to be condensed, and after being decompressed by the expansion valve 94, the evaporator heat exchanger 95.
Then, heat is absorbed from a brine (not shown) to evaporate and flows into the absorber 96.

On the other hand, the diluted 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, where the refrigerant flowing from the evaporator heat exchanger 95. The vapor is absorbed to become a concentrated liquid, and the solution is refluxed to the generator 92 by the solution pump 98.

[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 above-mentioned conventional absorption refrigerator, since the solution pump is driven by the electric motor, the power transmission between the electric motor and the electric motor and the solution pump is performed. There is a problem that a power of several hundred watts or more is required to secure a space for installing the mechanism and the solution pump and to drive the motor, and it is necessary to reduce the installation space and energy consumption.

[0007]

In order to solve the above-mentioned problems of the prior art, the present invention comprises a driving portion and an operating portion, and the driving portion includes a cylinder having a fluid inflow / outflow port at one end and a built-in piston. A pipe connected from the other end of the cylinder to the one end side or the outflow inlet, and an auxiliary pump connected to the pipe to convey fluid from the other end side of the cylinder to the one end side or the outflow inlet A differential pressure generating flow path and a pressure equalizing flow path provided with an opening / closing valve in parallel with the auxiliary pump, and the working portion is reduced when the cylinder internal volume on the one end side is expanded by the reciprocating motion of the piston. A cylinder that has a top surface that is smaller than the piston and that has a piston that interlocks with the piston, and an internal pressure at the end of the cylinder that is lower than the external pressure. A fluid inlet provided with a first valve mechanism that closes when the internal pressure rises above the external pressure and the internal pressure of the cylinder drops below the external pressure at the end on the same side as this fluid inlet. And a fluid outlet having a second valve mechanism that opens when the internal pressure rises above the external pressure, and a pump device of the first configuration,

A pump device having a second structure in which one or both of the piston and the cylinder in the driving part and the piston and the cylinder in the operating part of the first structure are replaced by a diaphragm mechanism,

In an absorption refrigerator in which a generator, a condenser heat exchanger, an evaporator heat exchanger, and an absorber are connected to form a refrigerant cycle and a solution cycle, the solution discharge pipe connected to the absorber is the first The solution inflow pipe connected to the fluid inflow port of the pump device of the first or second configuration and connected to the generator is connected to the fluid outflow port of the pump device, and further the refrigerant pipe or the solution pipe of the pump device is connected. An absorption chiller adapted to be connected to a fluid outlet / inlet.

[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 is constructed by directly connecting two pistons 1 and 2 having different top surface areas of piston heads via a connecting rod 3 so as to be interlocked.

A cylinder 4 slidably incorporating a piston 1 having a relatively large top surface has cylinder chambers 4A and 4B formed on both sides of the piston 1 to form cylinder chambers 4A and 4B.
On one side, for example, the end of the cylinder chamber 4A, a fluid outflow port 6 is opened, the other cylinder chamber 4B is connected to the pipe 7 connected to this outflow port 6, and the electric open / close valve V1 and the buffer tank 8 are provided on the way. And a small pump 9 as an auxiliary pump, which are connected to each other via a differential pressure generation flow passage 10 and are connected to the differential pressure generation flow passage 10 by an opening / closing valve V1, a buffer tank 8, and a pump 9. A pressure equalizing flow path 11 provided with parallel electric on-off valves V2 is connected to form a pump drive unit. In addition, 12 is a sealing material formed of, for example, a fluororesin.

The on-off valves V1 and V2 of the pump drive section are closed by one controller when one is open and the other is opened when one is closed, by a controller (not shown) for a predetermined time (for example, 0. It is installed so that the opening / closing operation is reversed every 5 to 5 seconds.

Further, the pump 9 is constructed so as to always operate during the operation of the pump device 100. The pump 9 has a discharge pressure of 0.5 MPa and has a pressure of 0.1 MPa.
Use a small pump that can suck up to a.

Further, the capacity of the buffer tank 8 is related to the discharge capacity of the pump 9, and when the fluid introduced through the pipe 7 is a gas, if it is larger than the excluded volume, the effect of alleviating the load fluctuation on the pump 9 is reduced. However, it is not always necessary.

On the other hand, the cylinder 5 in which the piston 2 having a relatively small top surface is slidably incorporated is provided in the cylinder chamber 4.
A cylinder chamber 5A that contracts when the internal volume of A expands due to the reciprocating motion of the piston 1 and expands when contracting is provided. At the end of this cylinder chamber 5A, the valve opens when the internal pressure drops below the external pressure, The fluid inlet 13 having a check valve V3 that closes when the internal pressure rises above the external pressure, and closes when the internal pressure of the cylinder chamber 5A falls below the external pressure, and the internal pressure rises above the external pressure. A fluid outlet 14 provided with a check valve V4 that opens at this time is opened to form a pump operating portion.

Then, the on-off valve V1 of the pump drive section is closed and the on-off valve V2 is opened to open the cylinder chamber 4A of the cylinder 4.
When the pressures of 4B are made equal, the pistons 1 and 2 are
(A) To move in the direction of the arrow, the pressure of the fluid in the cylinder chamber 5A (absolute pressure, the same applies below) is P _L , the area of the top surface of the piston 2 is S ₂ , and the sliding resistance of the pistons 1 and 2 is F
Then, it is necessary to satisfy the following equation.

F <(P _L −0.1) · S ₂ (1)

On the other hand, the on-off valve V1 is opened, the on-off valve V2 is closed, and the fluid in the cylinder chamber 4B is pumped to 0.1 by the pump 9.
When discharging to the pressure of MPa, pistons 1 and 2
Moves in the direction of the arrow in FIG. 1 (B) to decrease the internal volume of the cylinder chamber 5A, the pressure of the fluid in the cylinder chamber 5A is P _H , and the area of the top surface of the piston 1 is S _1. ,
The following equation must be satisfied.

(P _L −0.1) · S ₁ > (P _H −0.1) · S ₂ + f (2)

The above two inequalities are, for example, P _H = 2.1
MPa, P _L = 0.5 MPa, S ₁ = 100 cm ² , S ₂
= 15 cm ² and f = 30 N are given, and at the same time.

Thus, for example, in the evaporator heat exchanger 95
Evaporate and the refrigerant vapor of about 0.5 MPa is directed to the absorber 96.
For example, a capacity of 200 may be added to the refrigerant vapor pipe L1 that flows once.
cm ^Three Pump device 10 including the buffer tank 8
0 outflow inlet 6 is connected via pipe 7
The refrigerant is absorbed and discharged by the vessel 96 and melted at about 0.5 MPa.
Connect the inlet 13 of the working part to the solution discharge pipe L2 through which the liquid flows.
Then, the solution of about 2 MPa flowing into the generator 92 flows.
Connect the outlet 14 of the working part to the solution inflow pipe L3
Then, the absorption refrigerator 200 of the present invention is formed, and the pump 9 is
On-off valves V1 and V2 on the pump drive side while continuously operating
Is opened and closed alternately, for example, at 1 second intervals,

Even if the pump 9 is started, when the opening / closing valve V1 is closed and the opening / closing valve V2 is opened, both sides of the cylinder chambers 4A and 4B communicate with each other and the pressures on both sides of the piston 1 become equal. Since the stress for moving the piston 1 does not act and the pressure in the cylinder chamber 5A is at least the pressure of the solution flowing through the solution discharge pipe L2 by the action of the check valve V3, that is, 0.5 MPa. 1), the pistons 1 and 2 move in the direction of the arrow in FIG. 1 (A) to increase the internal volume of the cylinder chamber 5A that is the pump operating portion, and the solution discharged from the absorber 96 to the solution discharge pipe L2. Flows into the cylinder chamber 5A through the inflow port 13.

On the other hand, when the on-off valve V1 is opened and the on-off valve V2 is closed, the refrigerant vapor in the linder chamber 4B is quickly discharged by the pump 9, the pressure in this portion drops, and the pressure in the cylinder chamber 4A becomes higher. Since the above inequality (2) is satisfied, the pistons 1 and 2 move in the direction of the arrow in FIG. 1 (B) to pressurize the solution in the cylinder chamber 5A, and the solution inflow pipe L
When it becomes higher than the pressure of the solution in 3, the check valve V4 is opened and the solution is discharged from the cylinder chamber 4A to the solution inflow pipe L3.

That is, while the small pump 9 is continuously operated, the low-pressure solution in the absorber 96 flows into the cylinder chamber 5A on the pump operating portion side by opening and closing the on-off valves V1 and V2 on the pump driving portion side. Since it can be pressurized and sent to the regenerator 92 that has been heated to a high pressure by heating means 91 such as a gas burner, it is necessary to install a large electric motor that consumes electric power of several hundred watts or more as in the conventional case. No running costs can be saved.

Further, it is not necessary to secure a space for installing a large electric motor, a power transmission mechanism such as a crank provided between the electric motor and the solution pump, a solution pump, etc., and the pump 9, the cylinders 4, 5, ... Open / close valve V1 ・ V
Since it is also possible to dispose two or the like in a distributed manner, it is possible to increase the degree of freedom in the arrangement of equipment and effectively utilize the space to reduce the size of the entire apparatus.

If the amount of fluid to be conveyed is not so large and the amount is sufficient even if the pump 9 is repeatedly started and stopped, the on-off valve V1 may be omitted and the inertia may be reduced. It is also possible to configure so that the activation and deactivation of 9 are repeated.

Further, the pistons 1 and 2 can be replaced by a diaphragm structure as shown in FIG.
In the figure, 15 is a diaphragm that replaces the piston 1, and 16 is a diaphragm that replaces the piston 2.
Drive chamber 4a corresponding to cylinder chamber 4A.
And the pressure in the drive chamber 4b corresponding to the cylinder chamber 4B and the pressure in the working chamber 5a corresponding to the cylinder chamber 5A, the same operation as the pistons 1 and 2 is performed, and the fluid on the low pressure side is operated. It can be sucked into the chamber 5a, pressurized and discharged to the high pressure side.

The on-off valves V1 and V2 can be replaced by an electric rotary valve V5 as shown in FIG. 4 (A) and an electric or pilot type three-way valve V6 as shown in FIG. 4 (B). .

Further, the discharge side of the pump 9 is directly connected to the cylinder chamber 4A of the cylinder 4, or the pipe 7 is connected to another pipe portion through which the refrigerant vapor flows, a pipe portion through which the refrigerant liquid flows, or a pipe portion through which the solution flows. It is also possible to do so.

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

[0032]

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 amount of power energy and conveyed to the high pressure side, so that the running cost can be reduced. In addition, a small auxiliary pump can be used, and the auxiliary pump and on-off valve can be connected by pipes. It is possible to reduce the size of the device by effectively utilizing the space.

Therefore, by using this pump device as a pump for transferring the solution from the low pressure absorber to the high pressure generator, it is possible to provide a compact and energy saving type absorption refrigerator.

[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 of a modified embodiment.

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

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

[Explanation of symbols]

 1.2 Piston 3 Connecting rod 4.5 Cylinder 4A / 4B / 5A Cylinder chamber 4a / 4b Drive chamber 5a Working chamber 6 Outflow inlet 7 Piping 8 Buffer tank 9 Pump 10 Differential pressure generation flow passage 11 Equalization flow passage 12 Seal Material 13 Inlet 14 Outlet 15 ・ 16 Diaphragm 91 Heating means 92 Generator 93 Condenser heat exchanger 94 Expansion valve 95 Evaporator heat exchanger 96 Absorber 97 Pressure reducing valve V1 ・ V2 Open / close valve V3 ・ V4 Check valve V5 Rotary valve V6 Three-way valve 100 Pump device 200 Absorption refrigerator

 ──────────────────────────────────────────────────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 cylinder comprising a driving part and an operating part, wherein the driving part has a fluid inflow / outflow port at one end and a built-in piston, and the other end of the cylinder is connected to the one end side or the outflow / outflow port. And a differential pressure generating flow path including an auxiliary pump connected to the pipe to convey fluid from the other end side of the cylinder to the one end side or the outflow inlet, and the auxiliary pump including an opening / closing valve. And a pressure equalizing flow path provided in parallel, and the operating portion has a top surface having a smaller area than the piston, which contracts when the cylinder internal volume on the one end side expands due to the reciprocating motion of the piston and expands when contracting. And a first valve that opens when the internal pressure drops below the external pressure and closes when the internal pressure rises above the external pressure at the end of the cylinder. A fluid inlet with a mechanism and a valve at the end on the same side as this fluid inlet that closes when the internal pressure of the cylinder drops below the external pressure, and opens when the internal pressure rises above the external pressure. And a fluid outlet having two valve mechanisms. 2. The pump device according to claim 1, wherein one or both of the piston and the cylinder in the driving portion and the piston and the cylinder in the operating portion are replaced by a diaphragm mechanism. 3. An absorption refrigerating machine in which a refrigerant cycle and a solution cycle are constituted by connecting a generator / condenser heat exchanger / evaporator heat exchanger / absorber, and a solution discharge pipe connected to the absorber is provided. The fluid inlet of the pump device according to claim 1 or 2, the solution inflow pipe connected to the generator is connected to the fluid outlet of the pump device, and the refrigerant pipe or the solution pipe is further connected to the fluid of the pump device. An absorption chiller characterized by being connected to the inflow / outflow inlet of.