JP3291394B2 - Heat transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a heat medium circuit for pumping a heat medium by driving a pump, and the heat medium circuit includes a heat medium accumulator for buffering pressure changes caused by pulsation of the pump. It relates to a transport device.

[0002]

2. Description of the Related Art Generally, when water is pumped by an electromagnetic pump (pump) in a water channel, a pulsating flow is generated.
In order to prevent energy loss due to such pulsating flow, a configuration in which an accumulator heating medium is disposed on the discharge side of a pump is known.

For example, in the prior art, as shown in FIG. 5, an accumulator 33 for water is provided on a discharge side pipe of a pump 31. This water accumulator 3
Reference numeral 3 divides the inside of the housing 34 into a pressure chamber 36 connected to the discharge side of the pump by a rubber diaphragm 35 and a sealed buffer chamber (air chamber) 37. The pulsation generated by the electromagnetic pump is absorbed by utilizing the elasticity of the air.

On the other hand, in the conventional heat transfer apparatus circuit for heating, a large pressure rise occurs in the pump when it is discharged.
For example, the discharge side pressure of the pump in the circulation circuit is as shown in FIG.
It is known that a peak pressure fluctuation (pulsation) occurs as shown by a broken line in FIG. 1, and there is a problem that such pulsation causes a decrease in pump efficiency and causes vibration and noise.

In order to reduce the pump efficiency and reduce vibration and noise, it is conceivable to use a conventional water accumulator in the heat medium circuit.

[0006]

However, in the conventional accumulator for water, since the fluid is water, there is no need to worry about leakage of air sealed in the buffer chamber 37. If a heat medium such as chlorofluorocarbon is used, fluorocarbon has a higher saturated vapor pressure than water, so if a conventional water accumulator is used as it is, the rubber diaphragm will have insufficient strength. There is a problem that the air spring in the buffer chamber 37 must be replaced with Freon gas. In this case, it is difficult to maintain the CFC at a predetermined pressure in the buffer chamber 37 because the CFC is easily released from the buffer chamber 37.

That is, there is a problem that the pulsation of the pump cannot be reliably buffered through the diaphragm by using the conventional accumulator for water.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a heat transfer apparatus which can simply and reliably buffer the pulsation of a pump in a heat medium circuit using a heat medium such as Freon. .

[0009]

According to a first aspect of the present invention, there is provided a heat medium circuit for pumping a heat medium by driving a pump, the heat medium circuit being generated by pulsation of the pump. In a heat transfer device provided with a heat medium accumulator that buffers a pressure change, the heat medium circuit includes a heat medium amount adjustment receiver tank provided on a suction side of the pump, and discharge of the receiver tank and the pump. And a communication passage connected to the side, and the heat medium accumulator is arranged in the communication passage,
The heat medium accumulator is separated by a diaphragm into a pressure chamber and a buffer chamber. The pressure chamber is connected to the discharge side of the pump, and the buffer chamber is connected to the receiver tank.

According to a second aspect of the present invention, there is provided a heat transfer device having a heat transfer medium circuit for pumping a heat transfer medium by driving a pump, and having a heat transfer medium accumulator for buffering a pressure change caused by pulsation of the pump. In the heat medium circuit, a receiver tank for adjusting the heat medium amount provided on the suction side of the pump, and a communication passage connected to the receiver tank and the discharge side of the pump, the communication passage While disposing the heat medium accumulator, the heat medium accumulator is separated into a pressure chamber and a buffer chamber by a diaphragm, the pressure chamber is connected to the discharge side of the pump, the buffer chamber is connected to the receiver tank. The buffer chamber is provided with a heater that communicates with the buffer chamber and heats the buffer chamber.

According to a third aspect of the present invention, there is provided a heat transfer medium having a heat transfer medium circuit for pumping a heat transfer medium by driving a pump, the heat transfer circuit having a heat transfer medium accumulator for buffering a pressure change caused by pulsation of the pump. In the apparatus, the heat medium circuit includes a receiver tank for adjusting a heat medium amount provided on a suction side of the pump, and a communication passage connected to the receiver tank and a discharge side of the pump. The heat medium accumulator is arranged in a passage, and the heat medium accumulator is separated into a pressure chamber and a buffer chamber by a diaphragm, the pressure chamber is connected to a discharge side of the pump, and the buffer chamber is connected to the receiver. The heater is connected to the tank, and the buffer chamber is provided with a heater for heating the buffer chamber. The elastic member is provided to resist.

[0012]

According to the first aspect of the present invention, the pulsation generated on the discharge side of the pump is transmitted to the diaphragm via the pressure chamber. The diaphragm tends to deform in response to pressure changes due to pulsation. However, in the buffer chamber, since the heat medium gas (steam) separated by the receiver tank is introduced, the heat medium vapor is reliably held. Due to the spring effect of the compressed gas, the pressure change transmitted through the diaphragm is attenuated, and the pulsation is buffered.

According to the second aspect of the present invention, since the buffer chamber is heated, it is possible to prevent the liquid from flowing into the buffer chamber, maintain the gas spring effect, and reliably and reliably suppress pressure fluctuation due to pulsation. Can be easily buffered.

According to the third aspect of the present invention, since the elastic member is disposed in the buffer chamber, a sudden change in pressure due to pulsation of the pump can be sufficiently achieved by using the spring effect of the compressed gas and the elastic member in the buffer chamber. In addition, it is possible to reliably buffer.

[0015]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

As shown in FIG. 1, a heat transfer device 3 according to an embodiment of the present invention includes an indoor heat exchanger 5, an outdoor heat exchanger 7,
The circuit includes a circuit in which a heating burner 9, a receiver tank 10, and an electromagnetic pump (pump) 11 are arranged.
1, the heat medium is pumped and circulated in the circuit.

As shown in FIG. 2, the receiver tank 10 has a gas chamber 10a and a liquid chamber 10b, and the amount of the heat medium in the circuit is adjusted so that the liquid flows into the circuit. .

A communication passage 13 is provided in the circuit, and a heat medium accumulator 15 is disposed in the communication passage 13.

The communication passage 13 is connected to the gas chamber 10 a of the receiver tank 10 and the discharge pipe 17 of the electromagnetic pump 11.

As shown in FIGS. 2 and 3, the heat medium accumulator 15 divides the space inside the housing 19 into the diaphragm 2.
1 divides into a pressure chamber 23 and a buffer chamber 25. The diaphragm 21 is fixed by caulking by bending the edge of the housing 19, and is airtightly joined to the housing 19 by brazing. In this embodiment, the pressure chamber 2 is
Since the vapor of the heat medium introduced into 3 is introduced, the diaphragm 21 can be easily attached.

The pressure chamber 23 is communicated with the discharge pipe 17 of the electromagnetic pump 11 so as to directly receive a pressure change caused by driving the electromagnetic pump 11. Therefore, the pulsation generated by driving the electromagnetic pump 11 is introduced into the pressure chamber 23 and transmitted to the diaphragm 21.

The buffer chamber 25 is communicated with the gas chamber 10a of the receiver tank 10, so that the heat medium vapor (gas) separated in the receiver tank 10 is introduced. Therefore, the heat medium vapor is always introduced into the buffer chamber 25, so that the gas spring action can be reliably obtained.

A heater 27 such as a heating wire is provided around the buffer chamber 25 so that the inside of the buffer chamber 25 is heated as necessary or maintained at a predetermined temperature. By heating the inside of the buffer chamber 25 in this manner, the heat medium in the buffer chamber 25 is vaporized, and the flow of the liquid is prevented, so that the buffering force can be maintained.

Further, in the buffer chamber 25, the diaphragm 2 is provided.
A coil spring 29 is disposed as an elastic member for restoring 1 and absorbing pressure. With the configuration in which the coil spring 29 is arranged in this manner, the buffer chamber 2
5 has the effect of being used in combination with the spring action of the compressed gas in the pump 5, and can cope with a sudden increase in the pressure in the pressure chamber 23 when the operation of the electromagnetic pump is started. Therefore, the minimum required steam pressure in the buffer chamber 25 can be reduced.

As the diaphragm 21, a metal diaphragm is used. The diaphragm 21 itself has a predetermined restoring force, and has a function of buffering an increase in the pressure in the pressure chamber 23 to some extent. I have.

Next, the operation of this embodiment will be described.

The heat transfer device of this embodiment is used as a heating device. After the heat medium is heated by the heating burner 9 in the outdoor heat exchanger 7, the heat medium is radiated by the indoor heat exchanger 5. To heat the room.

The circulation of the heat medium is performed by driving the electromagnetic pump 11. In the electromagnetic pump 11, periodic pulsation occurs due to the reciprocating operation of the plunger.

The increase in pressure at the discharge port of the electromagnetic pump 11 due to the pulsation is transmitted to the diaphragm 21 through the pressure chamber 23.

In the diaphragm 21, an attempt is made to deform in accordance with the pressure in the pressure chamber 23, but the coil spring 29 attenuates the pressure in accordance with the deformation of the diaphragm 21.

More specifically, the heat medium in the pressure chamber 23 presses the diaphragm 21 toward the buffer chamber 25 against the urging force of the coil spring 29. In this case, the high pressure of the heat medium is absorbed by the urging force of the spring 21. Furthermore, since the heat of the heat medium is sealed in the buffer chamber 25, the vapor pressure elastically absorbs the pressure change in the pressure chamber 23.

In particular, in this embodiment, due to the combined use of the spring effect of the compressed gas in the buffer chamber 25 and the elastic member 21 itself in the buffer chamber 25, as shown by the solid line in FIG. Pressure changes can be sufficiently and reliably buffered.

Therefore, it is possible to improve the efficiency of the electromagnetic pump and prevent vibration and noise caused by pulsation.

The present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention.

For example, the heater 27 is not limited to being provided outside the housing 19 of the accumulator for a heat medium.
A similar effect can be obtained even with a configuration in which the components are arranged in the inner space 9.

[0036]

According to the heat medium accumulator of the first aspect of the present invention, the pulsation generated on the discharge side of the pump is transmitted to the diaphragm through the pressure chamber. The diaphragm tends to deform in response to pressure changes due to pulsation, but in the buffer chamber, the heat medium vapor (steam) separated by the receiver tank is introduced, so that the heat medium vapor is reliably held. Due to the spring effect of the compressed gas, the pressure change transmitted through the diaphragm is attenuated, and the pulsation is buffered.

According to the second aspect of the present invention, since the buffer chamber is heated, it is possible to prevent the liquid from flowing into the buffer chamber, maintain the gas spring effect, and reliably and reliably suppress the pressure fluctuation due to pulsation. Can be easily buffered.

According to the third aspect of the present invention, since the elastic member is arranged in the buffer chamber, a sudden change in pressure due to pulsation of the pump can be sufficiently achieved by using the spring effect of the compressed gas and the elastic member in the buffer chamber. And reliably buffered. In particular, a sudden change in pressure when the pump is started can be absorbed by the elastic member. In this case, a coil having a small spring coefficient can be used as the elastic member.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a heat medium in a heat transfer device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a main part of the heat transfer device shown in FIG.

FIG. 3 is a sectional view of the heat medium accumulator shown in FIG. 2;

FIG. 4 is a graph showing pressure fluctuations in the heat medium circuit shown in FIG. 1 in relation to a conventional case.

FIG. 5 is a sectional view showing a conventional accumulator.

[Explanation of symbols]

 Reference Signs List 3 air conditioner 5 indoor heat exchanger 7 outdoor heat exchanger 10 receiver tank 11 electromagnetic pump (pump) 13 communication passage 15 heat medium accumulator 23 pressure chamber 25 buffer chamber 27 heater 29 coil spring (elastic member)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F24D 7/00 F28D 15/02 F28D 15/02 101

Claims (3)

(57) [Claims] 1. A heat transfer device comprising a heat medium circuit for pumping a heat medium by driving a pump, wherein the heat medium circuit includes a heat medium accumulator for buffering a pressure change caused by pulsation of the pump. The medium circuit includes a receiver tank for adjusting a heat medium amount provided on a suction side of the pump, and a communication passage connected to the receiver tank and a discharge side of the pump. Along with disposing an accumulator, the heat medium accumulator is separated into a pressure chamber and a buffer chamber by a diaphragm, the pressure chamber is connected to the discharge side of the pump, and the buffer chamber is connected to the receiver tank. A heat transfer device. 2. A heat transfer device comprising: a heat medium circuit for pumping a heat medium by driving a pump; and a heat medium circuit provided with a heat medium accumulator for buffering a pressure change caused by pulsation of the pump. The medium circuit includes a receiver tank for adjusting the amount of the heat medium provided on the suction side of the pump, and a communication passage connected to the receiver tank and the discharge side of the pump. While disposing an accumulator, the heat medium accumulator is separated into a pressure chamber and a buffer chamber by a diaphragm, the pressure chamber is connected to the discharge side of the pump, and the buffer chamber is connected to the receiver tank. And a heater for heating the buffer chamber is provided in the buffer chamber. 3. A heat transfer device comprising a heat medium circuit for pumping a heat medium by driving a pump, wherein the heat medium circuit is provided with a heat medium accumulator for buffering a pressure change caused by pulsation of the pump. The medium circuit includes a receiver tank for adjusting the amount of heat medium provided on the suction side of the pump, and a communication passage connected to the receiver tank and the discharge side of the pump. Along with disposing an accumulator, the heat medium accumulator is separated into a pressure chamber and a buffer chamber by a diaphragm, the pressure chamber is connected to the discharge side of the pump, and the buffer chamber is connected to the receiver tank. And a heater for heating the buffer chamber is provided in the buffer chamber, and an elastic portion for resisting deformation of the diaphragm is provided. Heat transfer apparatus, characterized in that is provided.