JPH0648117B2 - Auxiliary heat collector for engine driven heat pump - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to an auxiliary heat collecting device that enables efficient use of engine exhaust heat and efficient drainage of drain in an engine driven heat pump device.

[Prior art]

The heat pump device is a device in which a refrigerant compressed by a compressor is forcedly circulated in a circuit having a heat exchanger and heat is exchanged in the heat exchanger, and is used for an air conditioner, a hot water supply device, and the like.

In such a heat pump device, there is one in which an engine of an internal combustion engine is used instead of an electric motor as a drive source of the compressor. In the air conditioner and the hot water supply device when the engine-driven heat pump device performs the heating operation, there is an advantage that the exhaust heat of the engine can be utilized as a heat collection auxiliary in addition to the original heat exchange by the heat pump.

As a device utilizing the engine exhaust heat as described above, for example, there is a proposal to utilize a silencer as described in Japanese Utility Model Laid-Open No. 58-161119. However, in this conventional proposal, since the cooling water pipe is simply passed through the silencer,
The heat recovery efficiency is not always good, and as a result, there is a drawback that the device must be upsized.

Furthermore, when the cooling water pipe is passed through the muffler in this way,
Moisture in the exhaust gas is condensed to generate drainage, and the drainage is acidic, so there is a problem that the silencer or the like is corroded early and the life of the equipment is shortened.

[Problems to be Solved by the Invention]

An object of the present invention is to improve the heat recovery efficiency of engine exhaust heat, thereby achieving a compact heat exchanger,
Another object of the present invention is to provide an auxiliary heat collector for an engine-driven heat pump device that can solve the problem of early corrosion of equipment by efficiently discharging drainage.

[Means for Solving the Problems]

According to the present invention to achieve the above object, a compressor is driven by an engine to forcibly circulate a refrigerant compressed by the compressor, and a silencer connected to the engine and an exhaust pipe of the engine is provided together with the compressor in a case. In the heat pump device housed inside, a water jacket is attached to the silencer,
The whole is horizontally arranged in an inclined manner, and the exhaust pipe communicating with the silencer is provided at the upper end of the inclination, and the cooling water outlet continuously provided with the water jacket, while the silencer is provided at the lower end of the inclination. Exhaust port and a cooling water inlet of the water jacket are provided, and the inner space of the muffler is partitioned into multiple small gaps by a plurality of partition plates extending in the vertical direction, and the multiple small gaps are zigzag-shaped. And a drain passage penetrating the large number of partition plates at the bottom of the internal space,
A drain pipe communicating with the outside is provided at the lowest position of the bottom of the internal space on the inclined lower end side of the silencer, independently of the exhaust port of the internal space.

In this way, the space inside the silencer was partitioned into multiple small gaps by a large number of partition plates, and the exhaust gas was made to flow in a zigzag manner, improving the efficiency of heat recovery from the exhaust gas,
And as a result, the heat exchanger can be made compact. Further, since a drain passage is provided at the bottom of the silencer internal space so as to penetrate the large number of partition plates, and a drain pipe communicating with the outside is provided at the lowest position of the bottom of the internal space, it is generated in the internal space. By promptly discharging the drain out of the muffler, it is possible to prevent corrosion and extend the life of the muffler. In addition, a muffler with a water jacket was arranged in an inclined manner, and an exhaust pipe and a cooling water outlet for the water jacket were provided at the upper end of the inclined portion, while an exhaust port and a cooling water inlet for the water jacket were provided at the lower inclined end. Therefore, by making the flow direction of the cooling water and the flow direction of the exhaust gas face each other, the heat exchange is equalized in the horizontal direction of the silencer, and the overall thermal efficiency is increased. Moreover, since the draining of the vapor component in the gas in each partition plate is made uniform,
Only some of the partition plates will not be corroded early and the durability of the silencer will not be reduced.

Further, since the gas temperature is lowered, and the drain outlet where the corrosive drain collects is provided on the inclined lower end side where the cooling water before heat exchange is supplied, the increase in the corrosion reactivity of the drain due to the high temperature is suppressed, Prevents corrosion of the drain outlet. Also,
At the upper end of the slope where the gas temperature is high, the corrosive drain does not immediately flow down and stay, so the durability of the silencer can be improved.

Furthermore, since the drain pipe is provided independently of the exhaust port of the internal space, the drain does not scatter around the exhaust port due to the exhaust gas pressure and corrode peripheral equipment.

〔Example〕

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

FIG. 1 shows a system when the engine-driven heat pump device is used as a hot water supply device. In the system diagram of FIG. 1, reference numeral 15 is a hot water storage tank, and fresh water is supplied from a water supply pipe 17 and hot water is discharged from a hot water discharge pipe 18. Water in the hot water storage tank 15 is collected by the hot water pump 16 in the hot water circuit III through the hot water heat exchanger 3 serving as a main heat collecting device, and then the heat exchanger 12 serving as an auxiliary heat collecting device. The heat is collected through the heat exchanger 10 and then returned to the hot water storage tank 15 again. This hot water circuit III may be configured so that the hot water in the hot water storage tank 15 is directly circulated to the cooling jacket 1a of the engine 1 as shown in FIG. 2 so as to also serve as the cooling water circuit II in FIG.

Reference numeral 1 denotes a four-cycle engine, which uses a domestic gas such as city gas or propane gas as a fuel and is made to burn lean with an excess air ratio of about 1.1 to 1.6. Reference numeral 2 is a compressor driven by the engine 1. Compressor 2
Forms a refrigerant circuit I which compresses the refrigerant and circulates the refrigerant in the order of the hot water heat exchanger 3 serving as the main heat collector, the expansion valve 4, and the air heat exchanger 5 provided with the fan 6. There is. In the refrigerant circuit I, the refrigerant is compressed by the compressor 2 into a high-pressure gas, which is condensed and liquefied in the hot water heat exchanger 3 to radiate the heat of condensation to heat the hot water. The refrigerant liquefied by heat dissipation expands in the expansion valve 4 and becomes a low-pressure low-temperature refrigerant in which a part is gasified, and then absorbs heat from the outside air forcedly blown by the fan 6 in the air heat exchanger 5. Which becomes gasified. This gasified refrigerant returns to the compressor 2 again, and the above cycle is repeated again.

In the engine 1, the fuel gas is supplied from the intake pipe 7, and the exhaust gas is exhausted to the atmosphere from the exhaust pipe 8 through the silencer 9. The exhaust pipe 8 and the muffler 9 are surrounded by a water jacket as will be described later, and constitute a heat exchanger 10 which is an auxiliary heat collecting device of the present invention. Cooling water is circulated by a cooling water pump 11 in a cooling jacket 1a for cooling the engine 1. The cooling water removes heat from the engine 1 and the heat is transferred to a heat exchanger 12 in a cooling water circuit II. Therefore, heat is radiated into the warm water. This heat exchanger 12
Is another auxiliary heat collector. Reference numeral 13 is a systern tank, and 14 is a starting motor.

As shown in FIGS. 3 and 4, the engine 1 includes a cylinder portion 1b.
Is a so-called horizontal engine, in which the lower four corners are supported on the support plate 20 by the anti-vibration rubbers 19, respectively. The compressor 2 is supported and fixed to the upper part of the engine 1 and is housed in an area surrounded by the four anti-vibration rubbers 19 arranged at the four corners in plan view. The compressor 2 thus installed is driven by the crankshaft of the engine 1 via the toothed rubber belt 21.

In addition to the compressor 2, a muffler 9, a starter motor 14, an air purifier 22, and the like connected to the exhaust pipe 8 are supported on the upper portion of the engine 1. Further above these devices are the heat exchanger 12 and the hot water circuit of the cooling water circuit II described above.
The hot water heat exchanger 3 of III is arranged inside and outside, and the cooling water pump 11 is arranged inside thereof. In these devices, the lower part is surrounded by the soundproof support plate 20, and the surroundings and the upper part are surrounded by the soundproof walls 23 and 24. Further, an air heat exchanger 5, a fan 6, a cistern tank 13 and the like are provided above and outside the upper soundproof wall 23.

As shown in detail in FIGS. 5 and 6, the muffler 9 arranged on the upper portion of the engine 1 has a cylindrical shape and is attached with the whole being inclined. The periphery of the muffler 9 is surrounded by the heat exchanger 10 of the water jacket to configure the above-described auxiliary heat collector of the present invention. Into the heat exchanger 10, the warm water of the hot water storage tank 15 described above is introduced into the inlet 2 at the lower end of the slope.
6 and is discharged from the outlet 27 at the upper end of the slope.

In the internal space of the muffler 9, an inclined upper end side to which the exhaust pipe 8 is connected becomes an expansion chamber 31, and a multi-layered small gap 32 partitioned by a large number of partition plates 25 is formed following the expansion chamber 31. ing. The partition plate 25 is fixed so that the outer periphery thereof is in close contact with the inner wall, and the partition plate 25 having the throttle holes 25a in the upper portion and the partition plate 25 having the throttle holes 25a in the lower portion are alternately arranged. That is, in the throttle holes 25a, the partition plates 25 that are adjacent to each other across the small gap 32 have different opening positions, and when one is on the lower side, the other is arranged on the upper side, and the small gaps 32 arranged in a multilayer form are formed. A zigzag flow path is formed. Further, drain passages 28, 28 are provided at the upper and lower ends of the partition plate 25, respectively, and a drain pipe 29 is provided so as to penetrate the inside and outside at the lowermost inclined position. The drain condensed from the drain pipe 29 is discharged to the outside.

The exhaust pipe 8 that connects the lower portion of the silencer 9 on the inclined upper end side and the exhaust hole of the engine 1 has a double pipe structure made of a stainless pipe or the like, and the space on the outer peripheral side is a heat exchanger 8a of a water jacket. It has become.

Exhaust gas flowing from the exhaust pipe 8 into the silencer 9 is expanded into the expansion chamber 3
After expanding by 1, the number of diaphragm holes 25 in the partition plate 25 is increased.
While passing through the small gap 32 of a and the multilayer shape in a zigzag shape,
The sound is exhausted by repeating expansion and contraction, and the exhaust port 3 on the lower end of the slope
Exhausted from 0. Further, while the exhaust gas flows in such a zigzag manner, high-temperature heat is received by the surfaces of a large number of partition plates 25, is transferred from the partition plates 25 to the inner wall closely attached to the outer periphery, and further inside the heat exchanger 10. Is transmitted to the hot water circulating. Since the cumulative surface area of the large number of partition plates 25 becomes extremely large, the heat of the exhaust gas flowing in the zigzag shape is collected very efficiently.

In this way, the expansion chamber 31 of the silencer 9 and the small zigzag gap 32 constitute a part of the heat exchanger 10 and are integrated, so that compared with the conventional case where the heat exchanger is provided independently. The device can be made compact and more efficient heat collection can be performed. Further, since the exhaust heat of the engine 1 is effectively utilized for heating hot water, the compressor 2 and the engine 1
The capacity can be reduced.

Further, by disposing the silencer 9 on the upper portion of the engine 1 as in the above embodiment, the installation width on the floor can be reduced and the exhaust pipe 8 can be shortened. This shortening of the exhaust pipe 8 reduces the amount of indoor heat radiation up to the muffler 9 and suppresses room temperature rise and heat deterioration of the rubber toothed belt 21.

Further, generally, as in the above embodiment, enclosing the outer periphery of the muffler 9 with the heat exchanger 10 of the water jacket means that in an engine in which a catalyst is installed in the muffler for treating NOx and the like, NO due to catalyst due to temperature decrease of gas
Since the x treatment function deteriorates, it is disadvantageous in terms of NOx treatment of exhaust gas. However, in the case where the engine 1 is made to burn lean as in the above embodiment, NO is obtained.
Since a harmful component such as x is rarely generated, it is not necessary to install a catalyst, and the effect of providing the auxiliary heat collecting device can be more remarkable. In particular, it is remarkable in the initial stage of starting when the engine temperature is low.

In the above embodiment, household gas is used as a fuel, but the same effect can be obtained in the case of a gasoline engine as long as it is a lean-burn engine using a lean air-fuel mixture with a large excess air ratio.

〔The invention's effect〕

As described above, according to the present invention, a water jacket is attached to a muffler connected to an exhaust pipe of an engine in an engine-driven heat pump device, while a multi-layered structure is formed by a large number of partition plates extending vertically in the inner space of the muffler. Since the small gaps of the multi-layered shape are communicated in a zigzag shape while being divided into small gaps, the exhaust gas is caused to flow in a zigzag manner to improve the efficiency of heat recovery from the exhaust gas, and as a result, the heat exchanger. Can be made compact.

Further, since a drain passage that penetrates the large number of partition plates is provided at the bottom of the silencer internal space, and a drain pipe that communicates with the outside is provided at the lowest position of the internal space bottom.
The drain generated in the internal space can be quickly discharged to the outside of the silencer, and the life of the silencer can be prevented from being shortened due to corrosion.

In addition, a muffler with a water jacket was arranged in an inclined manner, and an exhaust pipe and a cooling water outlet for the water jacket were provided at the upper end of the inclined portion, while an exhaust port and a cooling water inlet for the water jacket were provided at the lower inclined end. Therefore, by making the flow direction of the cooling water and the flow direction of the exhaust gas face each other, the heat exchange is equalized in the horizontal direction of the silencer, and the overall thermal efficiency is increased. Further, since the drainage of the vapor component in the gas in each partition plate is made uniform, corrosion of only some partition plates does not progress early and the durability of the silencer is not lowered.

Further, since the gas temperature is lowered, and the drain outlet where the corrosive drain collects is provided on the inclined lower end side where the cooling water before heat exchange is supplied, the increase in the corrosion reactivity of the drain due to the high temperature is suppressed, Prevents corrosion of the drain outlet. Also,
At the upper end of the slope where the gas temperature is high, the corrosive drain is prevented from flowing down and accumulating quickly, so that the durability of the silencer can be improved.

Further, since the drain pipe is provided independently of the exhaust port of the internal space, the drain does not scatter around the exhaust port due to the exhaust gas pressure and corrode peripheral equipment.

[Brief description of drawings]

FIG. 1 is a system diagram of an engine-driven heat pump device provided with an auxiliary heat collector of the present invention, FIG. 2 is a system diagram of another embodiment, and FIG. 3 is a partially cutaway view of the engine-driven heat pump device. FIG. 4 is a partially cutaway side view, and FIG. 5 is an enlarged front view of a main part of the same device showing a silencer part provided with an auxiliary heat collecting device according to the present invention in a particular cross section. 6 and 6 are views taken in the direction of arrows VI-VI in FIG. 1 ... Engine, 2 ... Compressor, 3 ... Hot water heat exchanger,
8 ... Exhaust pipe, 9 ... Silencer, 10 ... Heat exchanger (water jacket), 15 ... Hot water tank, 25 ... Partition plate, 25a
...... Throttle hole, 28 ...... Drain passage, 29 ...... Drain tube,
31 ... expansion chamber, 32 ... small gap.

Continuation of the front page (56) Reference JP-A-58-178853 (JP, A) Actually opened 50-27455 (JP, U) Actually opened 57-49515 (JP, U)

Claims (1)

[Claims] 1. A compressor is driven by an engine to forcibly circulate a refrigerant compressed by the compressor, and a silencer connected to the engine and an exhaust pipe of the engine is housed in a case together with the compressor. In the heat pump device,
A water jacket is attached to the muffler, and the whole of the muffler is inclined horizontally so that the exhaust pipe communicating with the muffler and the cooling water outlet communicating with the water jacket are provided at the upper end of the inclination. The exhaust port of the silencer and the cooling water inlet of the water jacket are provided at the lower end of the slope, and the internal space of the silencer is partitioned into a plurality of small gaps by a plurality of partition plates extending in the vertical direction, The small gaps of the multi-layered structure are connected in a zigzag manner, and a drain passage that penetrates the plurality of partition plates is provided at the bottom of the internal space, and at the lowest position of the bottom of the internal space on the inclined lower end side of the silencer. An auxiliary heat collecting device for an engine-driven heat pump device, characterized in that a drain pipe communicating with the outside is provided independently of the exhaust port of the internal space.