JP3837370B2 - Stirling cold supply system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a Stirling cold energy supply system that can supply cold energy generated using a Stirling refrigerator to a cold energy utilization device.
[0002]
[Prior art]
The Stirling refrigerator has features that it can be downsized, has a high coefficient of performance and refrigeration efficiency, can generate a low temperature range, and is easy to replace chlorofluorocarbon in recent global environmental problems.
[0003]
For this purpose, including commercial and household cold-use equipment such as freezers, refrigerators, throw-in coolers, etc., low-temperature liquid circulators, low-temperature thermostats, thermostatic baths, heat shock test devices, freeze dryers, temperature characteristic test devices, Use as a cold heat source in blood / cell storage devices, cold coolers, various measuring devices, and the like is being studied.
[0004]
The Stirling cold heat supply system is a system that can supply cold heat using such a Stirling refrigerator, and a Stirling refrigerator that compresses and expands the working gas to generate cold to cool the cold head, and the Stirling refrigerator A cooling heat transfer device that transfers the heat generated in the heat to the cold energy utilization device, a cooling water device that radiates the heat of the working gas to the atmosphere, a Stirling refrigerator, a cooling heat transfer device, a control device that controls the cooling water device, etc. Is housed in a housing.
[0005]
Then, the working gas is compressed and expanded by a Stirling refrigerator to generate cold, and the cold head is cooled by this cold.
[0006]
The cold heat transfer device is configured by connecting a cold energy utilization device and a cold head by a secondary refrigerant pipe, and circulating the secondary refrigerant through the secondary refrigerant pipe to cool the cold generated in the Stirling refrigerator to the cold heat utilization device. Transport.
[0007]
The cooling water device also supplies a working gas side heat exchanger (incorporated in the Stirling refrigerator) and a radiator for exchanging heat with the working gas whose temperature has risen when the working gas is compressed by a Stirling refrigerator. The cooling water is circulated through the cooling water pipe to radiate the heat of the working gas to the atmosphere.
[0008]
And a housing | casing accommodates a Stirling refrigerator, a cooling water apparatus, a cooling-heat transfer apparatus, etc., and the control apparatus is attached to the upper part of the said housing | casing.
[0009]
[Problems to be solved by the invention]
However, since the control device is attached to the upper part of the housing as described above, a crane cannot be used when removing heavy Stirling refrigerators or radiators at the time of repair, etc. They are pulled out while being shifted a little, and there are problems that work is difficult and accidents such as dropping may occur.
[0010]
In view of the above, an object of the present invention is to provide a Stirling cold heat supply system that can easily take out a heavy object.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 is a Stirling refrigerator that compresses and expands a working gas to generate cold, and a cold heat transfer device that transfers cold generated by the Stirling refrigerator to a cold energy utilization device; In a Stirling cold heat supply system having a cooling water device that radiates the heat of the working gas to the atmosphere and a housing that houses these, a bottom plate provided at the bottom of the housing, and a radiator of the Stirling refrigerator or the cooling water device And a vibration isolating rubber that absorbs vibration generated by a Stirling refrigerator or the like so as to keep a predetermined distance between the mounting table and the bottom plate. It is characterized by having a leg so that a heavy object can be easily taken out.
[0012]
According to the second aspect of the present invention, when repairing a heavy object such as a Stirling refrigerator or a radiator of a cooling water device, a lifter fork is inserted into a gap formed by an anti-vibration rubber leg to place the heavy object. The upper end of the bottom portion is positioned below the lower end of the gap so that the fork does not interfere with the bottom portion.
[0013]
The invention according to claim 3 is characterized in that the mounting table on which these are mounted is formed integrally or integrally so that the Stirling refrigerator and the radiator of the cooling water device can be taken out simultaneously during repair. To do.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a Stirling cold supply system 1 according to the present invention, and FIG. 2 is a perspective view showing the inside thereof.
[0015]
FIG. 3 shows a circuit diagram of the Stirling cold supply system 1. The Stirling cold supply system 1 includes two Stirling refrigerators 4 that generate cold, a cooling water device 5 that exchanges heat with the working gas in the Stirling refrigerator 4 and radiates the heat to the atmosphere, and a secondary refrigerant ( For example, a heat transfer device 6 that circulates HFE (hydrofluoroether) between the Stirling refrigerator 4 and the cold energy utilization device 3 and supplies the cold energy generated in the Stirling refrigerator 4 to the cold energy utilization device 3, and the cold energy utilization device. The main components are a control device (not shown) for controlling the entire Stirling cold heat supply system 1, a housing 8 for housing these, and the like.
[0016]
In FIG. 2, only the control device case 7 is shown, and the specific configuration of the control device is not shown.
[0017]
The Stirling refrigerator 4 is operated with a constant capacity, and intermittent operation according to the required amount of cold heat is performed.
[0018]
For this reason, in order to respond quickly to fluctuations in the heat load in the cold energy utilization device 3 and fluctuations in the required amount of cold energy, it is necessary to use a large Stirling refrigerator that can supply a large amount of cold energy.
[0019]
However, a large Stirling refrigerator increases the cost significantly, and the Stirling refrigerator is always operated with a constant capacity even during intermittent operation. In such a case, a large amount of excess cooling heat is generated, resulting in poor economic efficiency.
[0020]
Therefore, it is conceivable to operate a plurality of small Stirling refrigerators 4 according to the required amount of cold heat.
[0021]
At this time, a method of circulating the secondary refrigerant in series with respect to the plurality of Stirling refrigerators 4 and a method of circulating the secondary refrigerant in parallel can be considered.
[0022]
In the method of circulating in parallel, since the secondary refrigerant circulates in a divided manner to each Stirling refrigerator 4, the circulation amount of the secondary refrigerant can be increased, but the temperature drop rate of the secondary refrigerant is one Stirling. This is substantially the same as in the case of the refrigerator 4.
[0023]
Further, as described above, since the Stirling refrigerator 4 controls the amount of supplied cold by repeating operation and stop, all the Stirling refrigerators 4 must be operated and stopped simultaneously when circulating in parallel. If this happens, it will not be possible to efficiently supply cold heat.
[0024]
When operated simultaneously, the secondary refrigerant is cooled with a large ability to generate cold heat, so the interval between operation stops is shortened, and the load on the control components (for example, the number of times the power switch is turned on and off) increases. Highly reliable parts are required, which increases costs.
[0025]
On the other hand, in the method of circulating in series, since the secondary refrigerant sequentially circulates through a plurality of Stirling refrigerators 4, it is difficult to increase the circulation amount of the secondary refrigerant. It becomes possible to increase the temperature drop rate.
[0026]
Further, since it is possible to individually control the operation stop of the Stalin refrigerator 4, it is possible to lengthen the operation stop interval, and there is an advantage that the cost can be reduced by using inexpensive parts.
[0027]
From such a viewpoint, the present invention employs a configuration in which two or more Stirling refrigerators 4 are connected in series.
[0028]
In the case where two or more Stirling refrigerators 4 are used, when it is necessary to distinguish between them, it is necessary to describe them as the first Stirling refrigerator 4a, the second Stirling refrigerator 4b, etc. When there is no, it is simply described as Stirling refrigerator 4.
[0029]
As shown in FIG. 4, the Stirling refrigerator 4 includes a crank portion 12 that converts rotational power of the motor 11 into reciprocating power, and a compression piston 14 that is formed by reciprocating the compression cylinder 15. The compression part 17 that compresses the working gas in the space diagram 15, the expansion part 21 that expands the working gas in the expansion space 20 formed by the expansion piston 18 reciprocating in the expansion cylinder 19, and compression It has a heat storage section 22 made of a metal mesh sheet or the like provided in a gas flow path S that communicates the space diagram 15 with the expansion space 20.
[0030]
In the Stirling refrigerator 4, the crank portion 12 is housed in a crank housing 24 that forms a crank chamber 23. The crank 26 is connected to the motor shaft 25, the connecting rod 27 is connected to the crank 26 at one end, and the connecting rod 27. The cross guide head 28 is connected to the other end of the cross guide head 28, and a cross guide liner 29 that restricts the movement direction of the cross guide head 28 in one direction.
[0031]
Thereby, the rotational power of the motor 11 is converted into reciprocating power by the crank portion 12, and the compression piston 14 and the expansion piston 18 reciprocate.
[0032]
The expansion piston 18 moves with a phase advance of approximately 90 degrees with respect to the compression piston 14.
[0033]
Further, the compression piston 14 and the expansion piston 18 are connected to the cross guide head 28 via the piston rod 30, and one end thereof is closely attached and fixed to the piston rod 30, and the other end thereof is closely attached to the fixed plate 36. A fixed oil seal bellows 37 is provided.
[0034]
The oil seal bellows 37 is a metal bellows that expands and contracts as the piston rod 30 reciprocates, and airtightly partitions the space on the compression piston 14 or expansion piston 18 side and the space on the cross guide head 28 side.
[0035]
As a result, the oil 38 that lubricates the cross guide head 28 and the like adheres to the compression piston 14 and the expansion piston 18, and this prevents a reduction in refrigeration efficiency due to entering the compression space diagram 15 and the expansion space 20.
[0036]
Further, the oil seal bellows 37 causes a space (hereinafter referred to as a back pressure chamber) 39 sandwiched between the oil seal bellows 37 and the compression piston 14 or the expansion piston 18 to be in an airtight state.
[0037]
For this reason, when the compression piston 14 or the expansion piston 18 reciprocates, the atmosphere of the back pressure chamber 39 is compressed and expanded, and the energy required for this compression and expansion becomes a motor load, which reduces the efficiency of generating heat.
[0038]
Therefore, a buffer tank 41 in which the back pressure chamber 39 and the crank chamber 23 are connected via a bellows 40 is provided.
[0039]
Further, the working gas side heat exchanger 35 is provided so as to cover the compression space diagram 15 or to surround the gas flow path S communicating the compression space diagram 15 and the heat storage unit 22 so that the cooling water circulates. It has become.
[0040]
In the Stirling refrigerator 4 having such a configuration, when the compression piston 14 moves from the bottom dead center to the top dead center, the working gas in the compression space diagram 15 is compressed. During this time, the expansion piston 18 moves upward, reaches the top dead center, and then moves downward.
[0041]
The working gas compressed with the upward movement of the compression piston 14 flows through the gas flow path S and is sent to the expansion portion 21 side. When the expansion piston 18 moves downward, the working gas passes through the heat storage portion 22 and expands. 20 is sent.
[0042]
When the working gas passes through the heat storage unit 22, the heat is stored in the heat storage unit 22.
[0043]
As the expansion piston 18 reaches bottom dead center, the compression piston 14 moves from top dead center to bottom dead center, and the working gas expands.
[0044]
Since the expansion process at this time is an isothermal expansion process, the heat absorption accompanying the expansion is performed via the cold head 45 provided at the top of the expansion space 20, and as a result, the temperature of the cold head 45 is lowered and cold heat is generated. As will be described later, since the secondary refrigerant is in thermal contact with the cold head 45 and circulates, the secondary refrigerant is cooled by the generated cold heat.
[0045]
As the compression piston 14 approaches the bottom dead center, the expansion piston 18 starts to move upward, and the working gas passes through the gas flow path S and exchanges heat in the heat storage section 22 and returns to the compression space diagram 15.
[0046]
By operating such a cycle as one cycle, the cold heat of the cold head 45 is used for the cold utilization device 3.
[0047]
The heat transfer device 6 includes a cold heat source side heat exchanger that exchanges heat between the cold heat and the secondary refrigerant, and the cold heat source side heat exchanger is formed by the cold head 45 described above. Hereinafter, the cold head 45 is referred to as a cold heat source side heat exchanger 45.
[0048]
The heat transfer device 6 also includes a secondary refrigerant pump 46 that circulates the secondary refrigerant to the cold energy utilization device 3, a tank 47 that adjusts the amount of secondary refrigerant to be circulated, and the secondary refrigerant that has returned from the cold heat utilization device 3 side. A gas-liquid separator 48 that performs gas-liquid separation and returns only the liquid to the secondary refrigerant pump 46, and a pressure adjustment bellows that absorbs a change in pressure in the secondary refrigerant circuit caused by supplying cold heat from the cold energy utilization device 3. 49 etc.
[0049]
The secondary refrigerant circulates through the second cold heat source side heat exchanger 45b, the first cold heat source side heat exchanger 45a, the cold energy utilization device 3, and the secondary refrigerant pump 46.
[0050]
The gas-liquid separator 48 gas-liquid separates the gas-liquid mixed secondary refrigerant returned from the cold energy utilization device 3, and is erected in a pipe 52 between the cold energy utilization device 3 and the secondary refrigerant pump 46. Gas-liquid separation pipe 44, liquid return pipe 50 for returning the liquid secondary refrigerant to the secondary refrigerant circuit, gas recovery pipe 51 for guiding the gas-liquid separated gas secondary refrigerant to the tank 47, and the like. Has been.
[0051]
The gas-liquid separation tube 44 and the liquid return tube 50 communicate with each other to form a substantially inverted U shape, and a gas recovery tube 51 is connected in the vicinity of the top.
[0052]
As a result, when the secondary refrigerant in the gas-liquid mixed state flows and returns to the secondary refrigerant pump 46, gas-liquid separation is performed by the gas secondary refrigerant rising in the gas-liquid separation pipe 44. The gaseous secondary refrigerant is recovered in the tank 47 via the gas recovery pipe 51.
[0053]
As a result of the gas-liquid separation, since only the liquid secondary refrigerant returns to the secondary refrigerant pump 46, inconvenience such as air biting in the secondary refrigerant pump 46 can be prevented.
[0054]
The gaseous secondary refrigerant that has risen in the gas-liquid separator 48 is recovered in the tank 47 through the gas recovery pipe 51, but is condensed when the temperature in the tank 47 is lower than the condensation temperature. It is stored in the tank 47.
[0055]
Of course, when the gaseous secondary refrigerant is rising in the gas-liquid separator 48, it may be condensed and liquefied, or the minute liquid secondary refrigerant may rise together with the gaseous secondary refrigerant. The condensed secondary refrigerant or liquid secondary refrigerant drops in the gas-liquid separator 48 or the liquid return pipe 50 and returns to the secondary refrigerant circuit.
[0056]
The tank 47 is provided with a level meter 54 for silently checking the amount of the secondary refrigerant stored in the tank 47, and that the amount of the secondary refrigerant has reached a predetermined amount at a plurality of levels. A plurality of level sensors 55 are provided so that they can be detected.
[0057]
The upper space of the tank 47 is connected to a pressure adjusting bellows 49, a safety valve 57, a tank vent 58, and a secondary refrigerant injection valve 59 in communication.
[0058]
The pressure adjustment bellows 49 expands and contracts to adjust the pressure of the secondary refrigerant circuit via the gas recovery pipe 51, the gas-liquid separation pipe 44, and the like. The safety valve 57 has an internal pressure of the tank 47 higher than a predetermined pressure. Then, by opening the valve, the internal pressure of the tank 47 is prevented from becoming an abnormal pressure.
[0059]
The tank vent 58 allows the tank 47 to be forcibly opened, and the secondary refrigerant injection valve 59 is opened and used when injecting the secondary refrigerant.
[0060]
The pressure adjustment bellows 49, the safety valve 57, the tank vent 58, and the secondary refrigerant injection valve 59 are provided in a rectangular block 60, which is a metal general-purpose product having a through-hole 77 therein as shown in FIGS. The corner block 60 is mounted on the upper portion of the tank 47.
[0061]
The secondary refrigerant turned into gas may be collected in the tank 47, or a leak may occur, resulting in a shortage of the amount of secondary refrigerant circulating in the secondary refrigerant circuit, and conversely for some reason. There is a concern that the amount of secondary refrigerant becomes excessive.
[0062]
Accordingly, a liquid replenishment pipe 61 and a liquid recovery pipe 62 are provided on the bottom side of the tank 47 in which the liquid secondary refrigerant is stored.
[0063]
The liquid replenishment pipe 61 is connected to the liquid return pipe 50, and a liquid replenishment valve 63 is provided between them. By opening the liquid replenishment valve 63, the secondary refrigerant circuit can be replenished with the liquid secondary refrigerant. It is like that.
[0064]
Further, the liquid recovery pipe 62 is connected to a pipe between the secondary refrigerant pump 46 and the second Stirling refrigerator 4, and a liquid recovery valve 64 is provided therebetween.
[0065]
As a result, when the amount of the secondary refrigerant circulating in the secondary refrigerant circuit becomes excessive, the liquid recovery valve 64 is opened and a part of the secondary refrigerant pumped from the secondary refrigerant pump 46 is transferred to the tank 47. By guiding, the amount of secondary refrigerant can be adjusted.
[0066]
By the way, the pressure adjusting bellows 49 expands and contracts in accordance with the pressure fluctuation in the secondary refrigerant circuit caused by the secondary refrigerant giving cold heat (the temperature rise of the secondary refrigerant) by the cold energy utilization device 3, so that the 2 It absorbs pressure fluctuations in the secondary refrigerant circuit, and its function is lost when a liquid secondary refrigerant flows into the pressure adjusting bellows 49.
[0067]
However, in the conventional configuration, since the pressure adjusting bellows is provided in the gas recovery pipe, the liquid secondary refrigerant may flow in.
[0068]
That is, the gas recovery pipe is designed so that only the gaseous secondary refrigerant flows in principle.
[0069]
However, a large pressure loss occurs between the connection point of the gas-liquid separation pipe 44 connected to the pipe between the cold energy utilization device 3 and the secondary refrigerant pump 46 and the connection point of the liquid return pipe 50. In some cases (for example, when the amount of circulating secondary refrigerant increases), the gas-liquid mixed secondary refrigerant flows into the gas-liquid separation pipe 44, and the liquid secondary refrigerant passes through the gas recovery pipe 51. A situation flows into the tank 47.
[0070]
Under such circumstances, when the pressure recovery bellows is provided in the gas recovery pipe as in the prior art, when the liquid secondary refrigerant flows into the tank through the gas recovery pipe, it also flows into the pressure adjustment bellows. Inconvenience occurs.
[0071]
For this reason, by making the connection point of the gas-liquid separator 48 and the connection point of the liquid return pipe 50 close to each other, the piping mounting method and the connection point position are devised so that a large pressure loss does not occur between them. It was.
[0072]
However, if the piping installation method and connection point location requirements are met, piping may need to be installed in a complicated route, complicating assembly work, and ensuring space for maintenance and inspection. This makes it difficult to reduce the size of the Stirling cold supply system 1 sufficiently.
[0073]
Therefore, in the present invention, even if the liquid secondary refrigerant flows into the tank 47 via the gas recovery pipe 51, it does not have to flow into the pressure adjusting bellows 49. Therefore, the pressure adjusting bellows 49 is placed in the upper space of the tank 47. Is attached to a corner block 60 provided in communication with the corner block 60.
[0074]
Further, the tank 47 and the gas recovery pipe 51 are attached with a gradient so that the attachment position of the tank 47 and the gas recovery pipe 51 is higher than the attachment position of the liquid return pipe 50 and the gas recovery pipe 51. For this reason, even if the liquid secondary refrigerant is about to flow into the tank 47 via the gas recovery pipe 51, this can be suppressed by the gradient.
[0075]
Such a configuration eliminates the need to consider the pressure loss between the connection point of the gas-liquid separation pipe 44 and the connection point of the liquid return pipe 50 when considering the pipe attachment method and the connection point position. It becomes possible to carry out a design with an emphasis on miniaturization of the cold heat supply system 1 and ease of maintenance work.
[0076]
Further, since the connection point of the gas-liquid separator 48 and the connection point of the liquid return pipe 50 can be arbitrarily set, a general-purpose product such as a T-shaped pipe can be used as the connection pipe, thereby reducing the cost. Can be achieved.
[0077]
When the working gas is compressed by the Stirling refrigerator 4, the temperature of the working gas rises. If the working gas is sent to the expansion unit 21 via the heat storage unit 22 in a state where the temperature has risen, the efficiency of generating cold heat decreases. For this reason, the cooling water device 5 is provided to dissipate the heat of the working gas to the atmosphere and transfer it to the expansion section 21.
[0078]
This cooling water device 5 is an operation in which a cooling water passage is formed so as to surround the gas flow path S between the compression space diagram 15 and the heat storage section 22 in the Stirling refrigerator 4 and heat is exchanged between the working gas and the cooling water. A gas-side heat exchanger 35, a radiator 65 that is an atmosphere-side heat exchanger that exchanges heat between the cooling water heat-exchanged in the working gas-side heat exchanger 35 and the atmosphere; A cooling fan 67 that circulates cooling water between the working gas side heat exchanger 35 and the radiator 65 and the like are configured.
[0079]
Two working gas side heat exchangers 35, radiators 65, and blowers 66 are used, but only one cooling water pump 67 is provided.
[0080]
Two Stirling refrigerators 4 are provided, and in order to distinguish them, the first Stirling refrigerator 4a and the second Stirling refrigerator 4b are described, and accordingly, the working gas side heat exchanger 35 is described. The radiator 65 and the blower 66 may also include a first working gas side heat exchanger 35a, a second working gas side heat exchanger 35b, a first radiator 65a, a second radiator 65b, a first blower 66a, and a second blower 66b as necessary. The first and second are attached as follows.
[0081]
In the cooling water circuit, the cooling water pump 67, the first radiator 65a, the first working gas side heat exchanger 35a, the second radiator 65b, and the second working gas side heat exchanger 35b are connected in a ring according to the circulation direction of the cooling water. Then, the radiator 65 and the working gas side heat exchanger 35 are connected in series so as to flow alternately one after another.
[0082]
The two radiators 65 are provided corresponding to the two Stirling refrigerators 4 for the following reason.
[0083]
That is, as described above, the secondary refrigerant that has absorbed the cold by the second Stirling refrigerator 4 is supplied to the first Stirling refrigerator 4 and further absorbs the cold by the first Stirling refrigerator 4. Supplied to the cold energy utilization device 3.
[0084]
Accordingly, the first Stirling refrigerator 4 operates in a temperature region closer to the temperature reached by the Stirling refrigerator 4 than in the second Stirling refrigerator 4.
[0085]
In this sense, one radiator 65 may be used and supplied to the first working gas side heat exchanger 35a first and then circulated to the second working gas side heat exchanger 35b. Can be supplied.
[0086]
However, for this purpose, it is necessary to improve the heat dissipation efficiency of the radiator 65 by using a large radiator 65 or by developing a radiator 65 based on a new principle, which causes a significant cost increase.
[0087]
Therefore, in the present invention, the radiator 65 is provided corresponding to each Stirling refrigerator 4 so that efficient heat radiation can be performed while suppressing an increase in cost by using a small radiator by an existing fin type heat exchanger. .
[0088]
It is also possible to use two cooling water pumps 67 corresponding to the radiator 65.
[0089]
However, in this case, if two cooling water pumps 67 are provided, the installation area is greatly increased, and it is cheaper to use one cooling water pump having a large pumping capacity than to use two cooling water pumps.
[0090]
Therefore, in the present invention, by using one cooling water pump 67, cost reduction and downsizing of the Stirling cold heat supply system 1 are achieved.
[0091]
7A and 7B are diagrams showing the configuration of the radiator, in which FIG. 7A is a top view, FIG. 7B is a front view, and FIG. 7C is a side view.
[0092]
The radiator 65 includes an inlet pipe 68 that forms a cooling water inlet, an outlet pipe 69 that forms a cooling water outlet, and a drain 70 that is connected to the outlet pipe 69 and is used when draining the cooling water in the radiator 65. And three radiator panels 71 that perform heat exchange with the atmosphere.
[0093]
Further, each radiator panel 71 is disposed horizontally at the upper and lower parts, and is connected to the inlet pipe 68 and the outlet pipe 69, respectively, between the upper header 72 and the lower header 73, and between the upper header 72 and the lower header 73. A liquid pipe 75 made of a large number of connected copper pipes, a fin 76 made of an aluminum plate or the like provided by fitting all of the liquid pipes 75 in each radiator panel 71, and a liquid pipe 75 in each radiator panel 71 are fixed. The three radiator panels 71 are integrally held and have a tube plate 77 that also serves to protect the fins 76.
[0094]
The liquid pipes 75 in each radiator panel 71 are arranged at equal intervals as schematically shown in FIG. 8, and the liquid pipes 75 of the adjacent radiator panels 71 are positioned between the liquid pipes 75. It is provided by shifting the installation phase.
[0095]
This is to improve the heat radiation efficiency by allowing the air exchanged with the cooling water to flow while meandering in the liquid pipe 75 of each radiator panel 71.
[0096]
Further, the liquid pipe 75 is fixed to the upper header 72 and the lower header 73 by brazing or the like, and has an effect of securing a work space in order to improve the fixing workability at that time.
[0097]
In addition, although a circular tube and a square tube can be used as the upper header 72 and the lower header 73, a circular tube is used in the present invention.
[0098]
This is selected in connection with the fixing technique when the liquid pipe 75 is fixed to the upper header 72 and the lower header 73. When a fixing method using heat such as brazing is adopted, the heat is This is because thermal stress is generated, and in the case of a square tube, there is a disadvantage that larger thermal deformation occurs than in the case of a circular tube.
[0099]
Therefore, a square tube can be used if a fixing technique that does not generate thermal stress such as crimping is used.
[0100]
The cooling water circuit includes a cooling water injection valve 78 that is used when water is poured into the cooling water circuit, and a plurality of air passages in the cooling water circuit that are opened when water is injected. It has an air vent valve 79, a plurality of drain valves 80 that are opened when draining the coolant in the coolant circuit, and the like.
[0101]
Next, the housing 8 that houses such devices will be described. As shown in FIGS. 1, 2 and 9, the housing 8 has a substantially rectangular parallelepiped shape formed by combining angle frames, and the Stirling refrigerator 4 and the radiator 65 are fixed to the bottom 90 thereof. At the same time, the control device case 7 is attached to the upper portion 91 so that the side panel 95, the back panel 96, and the front panel 97 are fixed by engaging means such as screws.
[0102]
A caster 110 and a stopper 111 are provided under the bottom 90 so that the caster 110 and the stopper 111 can be moved and fixed to an arbitrary place.
[0103]
The bottom 90 to which the Stirling refrigerator 4, the radiator 65, and the like are fixed is framed by a bottom frame 92, and a bottom plate 94 is stretched over the bottom frame 92. A vibration rubber leg 93 is attached.
[0104]
The bottom plate 94 is divided into three pieces, and the end portion 95 in the longitudinal direction of each bottom plate 94 is formed by being bent in an L shape.
[0105]
The upper surface of the bottom plate 94 is appropriately higher than at least the uppermost point of the bottom side frame 92. The reason for this will be described later.
[0106]
In this way, the bottom plate 94 is divided so that the atmosphere can enter and exit between the divided bottom plates 94 so that the atmosphere does not enter the casing 8 and the Stirling cooling and heating system is lightened. It is for aiming at.
[0107]
The reason why the end portion 95 of the bottom plate 94 is bent in an L shape is to reinforce the strength so that the heavy Stirling refrigerator 4 can be placed even if the bottom plate 94 is formed of a thin plate material.
[0108]
The Stirling refrigerator 4 is provided on the mounting table 98 via a vibration isolation spring 97, and the mounting table 98 is fixed to the bottom plate 94 via vibration-proof rubber legs 93.
[0109]
The vibration isolation spring 97 supports the mounting table 98 and the Stirling refrigerator 4 so as not to directly contact each other, and absorbs vibration generated in the Stirling refrigerator 4, and the vibration isolation rubber legs 93 are mounted from the bottom plate 94. The table 98 is supported by a predetermined distance to prevent transmission of vibration.
[0110]
The bottom frame 92 is provided with a back frame 99 and a front frame 100 on which a side panel 95 is screwed, and an upper frame 101 is stretched over them.
[0111]
A side panel 95 is attached to the rear frame 99 and the front frame 100, and a control device case 7 is attached to the upper frame 101.
[0112]
At this time, as shown in FIG. 10, the rear frame 99 on the radiator 65 side is attached to the rear corner of the bottom 90, but the front frame 100 on the Stirling refrigerator 4 side is appropriately placed on the radiator 65 side from the front corner. It is mounted in a set back with the position shifted.
[0113]
In the present specification, the Stirling refrigerator 4 side is referred to as the front and the radiator 65 side is referred to as the rear in the positional relationship between the Stirling refrigerator 4 and the radiator 65 shown in FIG. It is determined for the sake of convenience and does not limit the configuration of the present invention.
[0114]
Therefore, the front side frame 100 is set back and provided. The reason why the front frame 100 is set back in this way will be described later.
[0115]
A rear panel is fixed to the rear frame 99 by screwing, an air inlet 102 for sucking air is formed in the rear panel 96, and a front panel 97 is screwed to the bottom 90 and the upper frame 101. The front panel 97 is formed with an exhaust port 103 for exhausting the atmosphere.
[0116]
The air is sucked from the air inlet 102 of the rear panel 96, flows around the radiator 65, the blower 66, and the Stirling refrigerator 4 and is exhausted from the exhaust port 103 of the front panel 97.
[0117]
Normally, the blower 66 is arranged on the windward side so that the air blown by the blower 66 is blown against the radiator 65. However, in the present invention, as described above, Located on the leeward side.
[0118]
In the configuration in which the blower 66 is arranged on the windward side, when the air flows around the Stirling refrigerator 4, the air is heated by the heat of the motor 11 and the like, and this heat exchange is performed by the radiator 65. This is to prevent the heat dissipation efficiency of the cooling water from decreasing.
[0119]
A grill or the like (not shown) is provided at the intake port 102 or the exhaust port 103, the intake port 102 is provided to face the radiator 65, and the upper end of the exhaust port 103 is appropriately higher than the upper end of the intake port 102. Is formed.
[0120]
This is because a large number of devices such as the Stirling refrigerator 4 and the cold heat transfer device 6 are provided in the housing 8 and are arranged so as not to generate a dead space in order to reduce the size of the system. The air that has been blown against them blows into the housing 8.
[0121]
Therefore, in the present invention, as described above, the bottom plate 94 is divided and formed so that the upper end of the exhaust port 103 is appropriately higher than the upper end of the intake port 102.
[0122]
By making the bottom plate 94 into a divided configuration, air can flow in and out from between them, so that exhaust is promoted and the air in the housing is stirred by the air that flows in to suppress squeezing, Further, cooling is promoted by the Stirling refrigerator 4 or the like.
[0123]
Further, since the upper end of the exhaust port 103 is formed so as to be appropriately higher than the upper end of the intake port 102, the air in the housing 8 rises by natural convection and easily flows out of the exhaust port 103.
[0124]
At this time, if the opening area of the exhaust port is made as large as possible, it is preferable because the atmosphere in the housing can be easily exhausted, but if it is too large, the amount of sound leaking out from the Stirling refrigerator 4 or the like increases as noise. .
[0125]
Therefore, in the present invention, the opening ratio of the intake port 102 and the exhaust port 103 is set to the intake port 102: the exhaust port 103 = 1: 1.2 to 1: 1.5 in consideration of the exhaust efficiency of the atmosphere and noise leakage. It is set to be.
[0126]
By the way, the front side frame 100 is set back and provided for the following reason. That is, as shown in FIGS. 2 and 3, the secondary refrigerant circuit is formed by connecting a plurality of devices such as a plurality of Stirling refrigerators 4, a secondary refrigerant pump 46, and a gas-liquid separator 48 through a secondary refrigerant pipe. The cooling water circuit is formed by connecting a plurality of radiators 65 and a cooling water pump 67 with cooling water piping.
[0127]
Hereinafter, a pipe through which the secondary refrigerant circulates is referred to as a secondary refrigerant pipe, and a pipe through which the cooling water circulates is referred to as a cooling water pipe.
[0128]
The secondary refrigerant pipe is formed of a copper pipe or the like, and the cooling water pipe is formed of a plastic resin pipe or the like.
[0129]
Although not shown in FIGS. 2 and 3 and the like, a heat insulating material is wound around the secondary refrigerant pipe.
[0130]
In the conventional Stirling cooling and heating system, these secondary refrigerant pipes and cooling water pipes are laid in a complicated manner using empty spaces. The work when winding the heat insulating material was very difficult.
[0131]
Therefore, in the present invention, the front frame 100 is set back, and the two Stirling refrigerators 4 and the secondary refrigerant pump 46 are arranged side by side along the set back region, and the radiator 65 is arranged behind the two. is doing.
[0132]
Accordingly, the secondary refrigerant pipe and the cooling water pipe can be laid together, and the secondary refrigerant pipe can be laid on the setback region and the cooling water pipe can be laid on the back side.
[0133]
Note that the cooling water piping may be laid in the set back area and the secondary refrigerant piping may be laid on the back side. However, the piping bending work required for piping laying and the insulation material winding work are required. From the standpoint of easiness and the like, it is preferable to lay the secondary refrigerant together in a setback region provided by shifting the front side frame 100 which hinders these operations to the back side.
[0134]
By laying the cooling water pipe and the secondary refrigerant pipe together in this way, for example, when performing maintenance, it is easy to remove the cooling water or the secondary refrigerant from the cooling water circuit or the secondary refrigerant circuit, and There is an advantage that can be done reliably.
[0135]
That is, when removing the cooling water or the secondary refrigerant, one of the pipes is disconnected and the cooling water or the secondary refrigerant is received by a bucket or the like. In some cases, the pipe ends do not reach the bucket or the like, and a hose or the like must be connected separately.
[0136]
However, if the cooling water pipe and the secondary refrigerant pipe are laid together on the setback region and the back side as in the present invention, a bucket or the like is easily addressed to the end of the removed pipe. This makes it possible to easily remove the cooling water pipe and the secondary refrigerant pipe and to prevent them from becoming zero.
[0137]
In addition, when it is necessary to remove the Stirling refrigerator 4 and the radiator 65 during the maintenance, if the front frame 100 is attached to the front corner, the Stirling refrigerator 4 being pulled out is connected to the front frame. There is an advantage that it is possible to suppress inconvenience of being in contact with 100 and being damaged or brazed.
[0138]
By the way, at the time of maintenance of the Stirling cold heat supply system, it is necessary to install or take out the Stirling refrigerator 4, the radiator 65, etc., but since the control device case 7 is attached to the upper portion 91 of the housing 8, A heavy object such as the Stirling refrigerator 4 cannot be picked up using a crane or the like.
[0139]
For this reason, in the past, the worker removed the Stirling refrigerator 4 while shifting it little by little, but this caused poor workability and could cause accidents such as dropping.
[0140]
Therefore, in the present invention, when the Stirling refrigerator 4 is attached to the bottom plate 94 as described above, the anti-vibration rubber legs 93 are interposed between the mounting table 98 and the bottom plate 94, and the height thereof is set to a predetermined height. Is set.
[0141]
The predetermined height of the anti-vibration rubber leg 93 is a height at which the lifter fork 105 can be inserted as shown in FIG.
[0142]
As described above, the upper surface of the bottom plate 94 formed by bending the end portion 95 into an L shape (the surface on which the anti-vibration rubber legs 93 abut) is appropriately higher than the highest point of the bottom side frame 92. It is provided to be in position.
[0143]
This is because the fork portion 105 of the lifter can be inserted into the gap formed by the anti-vibration rubber legs 93 without coming into contact with the bottom side frame 92.
[0144]
11 shows an example in which the Stirling refrigerator 4 and the radiator 65 are separately removed. However, as shown in FIG. 12, the Stirling refrigerator 4, the radiator 65, and the cooling water pump 67 are removed at the same time. Alternatively, as shown in FIG. 13, the two Stirling refrigerators 4 and the radiator 65 cooling water pump 67 may be removed at the same time.
[0145]
In any case, since it is placed and taken out by the lifter, the take-out operation becomes easy, and particularly when two Stirling refrigerators 4 and the radiator 65 are removed simultaneously as shown in FIG. Since the cooling water pump 67 is also integrally removed, it is not necessary to drain the cooling water, and the operation becomes very easy.
[0146]
In FIG. 13, the two removed Stirling refrigerators 4 and the radiator 65 are shown, and the other parts are not shown.
[0147]
By the way, as described above, the heat insulating material is wound around the secondary refrigerant pipe. At this time, the heat insulating material is in close contact with the secondary refrigerant pipe so that the surface of the secondary refrigerant pipe does not come into contact with ice and the like. It is necessary to wrap it.
[0148]
In places where the secondary refrigerant pipe is substantially linear or where the curvature is large, it is easy to wind the heat insulating material in close contact with the secondary refrigerant pipe, but the place where the secondary refrigerant pipe has a small curvature and a plurality of secondary refrigerant pipes are arranged in parallel. In a place where the secondary refrigerant pipe is connected to a connecting portion formed on a surface orthogonal to the longitudinal direction of the pipe, etc. It is very difficult to install insulation.
[0149]
For example, at the location where the cold heat source side heat exchanger 45 and the secondary refrigerant pipe are connected, two secondary refrigerant pipes are laid close to each other. When the heat insulating material is taped and fixed to the secondary refrigerant pipe in such a place, the taping material does not enter between them, and the heat insulating material cannot be tightly wound around the secondary refrigerant pipe. is there.
[0150]
Therefore, in the present invention, the secondary refrigerant pipes are laid together in the setback region to reduce the occurrence of a bent portion, and a portion where contact is still difficult is formed with a heat insulating material unit and fitted into the portion. It is trying to install with.
[0151]
FIG.14 and FIG.15 shows the heat insulating material unit 106 to which the connection part of the cold-heat-source side heat exchanger 45 and secondary refrigerant | coolant piping is attached, FIG. 14 is the perspective view, FIG. 15 shows the state just before attachment. FIG.
[0152]
The heat insulating material unit 106 is formed of a metal unit frame 107 and a heat insulating material 109 that is formed in the unit frame 107 so as to be appropriately smaller than the secondary refrigerant pipe, and includes a pipe groove 108 into which the secondary refrigerant pipe is inserted. The secondary refrigerant pipe is inserted into the pipe groove 108, and the unit frames 107 are fixed to each other by inserting bolts into the screw holes 113.
[0153]
The number 114 shown in FIG. 14 is for preventing the heat insulating material 109 from being pulled out from the unit frame 107, and the number 115 indicates the heat insulating material that is connected and attached to the heat insulating material unit 106. The heat insulating material 115 is fixed by taping or the like.
[0154]
The heat insulating material 109 has a heat insulating property such as urethane and is formed of a member having an elastic property. When the secondary refrigerant pipe is inserted into the pipe groove 108, the pipe groove 108 has a shape of the secondary refrigerant pipe. And is in close contact with the secondary refrigerant pipe.
[0155]
As a result, a plurality of secondary refrigerant pipes are arranged side by side, and a place where it is difficult to wind the heat insulating material 109 while ensuring the close contact between the heat insulating material 109 and the secondary refrigerant pipe, such as a small interval. However, it can be easily and reliably attached.
[0156]
Although the piping groove 108 shown in FIG. 14 and the like has a rectangular shape, it goes without saying that it may have a semicircular shape in accordance with the shape of the secondary refrigerant piping. However, also in this case, it is preferable to make it appropriately smaller than the secondary refrigerant pipe.
[0157]
【The invention's effect】
As described above, according to the present invention, the bottom plate provided at the bottom of the casing, the mounting table on which a heavy object such as a radiator in the Stirling refrigerator or the cooling water device is mounted, the mounting table and the bottom plate Are provided so as to maintain a predetermined distance, and provided with vibration-proof rubber legs for absorbing vibrations generated in the Stirling refrigerator and the like, it is possible to easily take out heavy objects such as the Stirling refrigerator.
[Brief description of the drawings]
FIG. 1 is a perspective view of a Stirling cold heat supply system applied to an embodiment of the present invention.
FIG. 2 is a perspective view when a side panel or the like of the Stirling cold heat supply system is removed.
FIG. 3 is a circuit diagram of a Stirling cold supply system.
4 is a configuration diagram of a Stirling refrigerator 4. FIG.
FIG. 5 is a perspective view of a corner block.
FIG. 6 is a view showing a mounting state of the corner block.
FIG. 7 is a diagram showing a configuration of a radiator.
FIG. 8 is a diagram showing a configuration of a radiator liquid pipe and the like.
FIGS. 9A and 9B are views of a Stirling cold supply system, where FIG. 9A is a front view, FIG. 9B is a side view, and FIG. 9C is a rear view.
FIG. 10 is a side view when the side panel and the like of the Stirling cold heat supply system are removed.
FIG. 11 is a perspective view showing a state when one Stirling refrigerator is removed.
FIG. 12 is a perspective view showing a state when the Stirling refrigerator, the radiator, and the cooling water pump are removed at the same time.
FIG. 13 is a perspective view showing a state when a plurality of Stirling refrigerators and a radiator are removed at the same time.
FIG. 14 is a diagram showing a configuration of a heat insulating material unit.
FIG. 15 is a diagram showing an installation state of a heat insulating material unit.
[Explanation of symbols]
1 Stirling cold supply system
3 Cold energy equipment
4 Stirling refrigerator
5 Cooling water device
6 Cold transfer device
7 Control device case
8 Case
11 Motor
65 (65a, 65b) Radiator
66 (66a, 66b) Blower
67 Cooling water pump
90 bottom
91 Upper part
92 Bottom frame
93 Top (anti-vibration rubber feet
93 Anti-vibration rubber feet
94 Bottom plate
95 Side panel
96 Rear panel
97 Anti-vibration spring
97 Front panel
98 mounting table
99 Rear frame
100 Front frame
101 Upper frame
102 Inlet
103 Exhaust port
105 Fork
106 Insulation unit
107 unit frame
108 Piping groove
109 Thermal insulation

Claims (3)

A Stirling refrigerator that compresses and expands the working gas to generate cold, a cold transfer device that transfers the cold generated in the Stirling refrigerator to a cold energy utilization device, a cooling water device that dissipates the heat of the working gas to the atmosphere, In a Stirling cold supply system having a housing for storing these,
A bottom plate provided at the bottom of the housing;
A mounting table on which a heavy object such as a radiator of the Stirling refrigerator or cooling water device is mounted;
Stirling cold heat, characterized in that the mounting table and the bottom plate are provided between them so as to keep a predetermined distance, and have vibration-proof rubber legs for absorbing vibration generated in the Stirling refrigerator or the like. Supply system. When repairing heavy objects such as a radiator of the Stirling refrigerator or cooling water device, a lifter fork is inserted into a gap formed by the anti-vibration rubber legs, and the heavy object is placed and lifted and removed. 2. The Stirling cold supply system according to claim 1, wherein an upper end of the bottom portion is positioned below a lower end of the gap so that the fork does not interfere with the bottom portion. 3. The mounting table on which the Stirling refrigerator and the radiator of the cooling water apparatus are integrally formed or integrally formed so that they can be taken out simultaneously during repair. Stirling cold supply system.

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