JP3723405B2 - Refrigerator unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a refrigerator unit. More specifically, a compressor and a liquid receiver are fixed on a unit base, and a refrigeration cycle is configured by piping connection to an external fuselage, an external condenser, and the like. This is related to the machine unit.
[0002]
[Prior art]
In such a conventional refrigerator unit, as shown in FIGS. 6, 7 and 8, the compressor 2 constituting the refrigeration cycle is provided on the front side of the unit base 1, and a control for controlling the refrigerator unit beside it is provided. The electrical equipment box 3 that houses the device is placed and fixed. A vertical oil separator 4 is provided behind the compressor 2, and a liquid receiver 5 is provided behind the electrical box 3.
[0003]
A pressure gauge 6 and a pressure switch 7 for detecting the abnormal pressure and protecting the compressor 2 are fixed to the left side surface of the electrical box 3 and are arranged so as to be easily seen from the front.
[0004]
[Problems to be solved by the invention]
However, since the pressure gauge 6 and the pressure switch 7 are provided on the side surface of the electrical box 3, the width of the unit base 1 is required correspondingly, and it is not suitable for reducing the installation space. Then, an object of this invention is to aim at reduction of the installation space of a refrigerator unit.
[0005]
For this reason, the present invention fixes a compressor provided on a unit base , and a vertical liquid receiver higher than the compressor, and is connected to an external fuselage, an external fuser condenser, etc. by pipe connection. A refrigeration unit comprising: an upper part of the vertical liquid receiver, and an attachment plate attached at least to a position higher than the compressor; and an attachment plate attached to the attachment plate; A pressure switch and a pressure gauge for detecting abnormal pressure and protecting the compressor are provided .
[0006]
In the present invention , a soundproof exterior panel is attached in front of the compressor.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 is a front view of the refrigerator unit of the present invention, FIG. 2 is a plan view of the refrigerator unit of the present invention, FIG. 3 is a refrigerant circuit diagram of the refrigerator unit of the present invention, and FIG. FIG. 5 is a plan view of the liquid injection functional element.
[0008]
First, in FIG. 1 and FIG. 2, on the unit base 10 having a flat mounting surface, the two compressors 11 and 12 that suck and compress the refrigerant to be high-temperature and high-pressure are placed at the front positions in consideration of maintenance. Set up side by side. An oil separator 13 and a gas-liquid separator 14 which will be described later are disposed on the back of the compressor 11, and a vertical liquid receiver 15 on the unit base 10 is disposed on the back of the compressor 12. To fix.
[0009]
A first support plate 16 is erected on the left end portion of the unit base 10 on the rear side of the compressor 11, and is a substantially central position in the left-right direction on the unit base 10 and is flat on the rear end portion. A second columnar plate 17 having a U-shape is erected. Then, an electrical box 19 containing a control device for controlling the refrigerator unit is placed and fixed on the two horizontal support plates 18 and 17 and the planar horizontal mounting plate 18 supported by the liquid receiver 15. To do. That is, a support piece bent inward is formed at the front of the upper end of the first support plate 16, and the left end of the horizontal mounting plate 18 is fixed to the support piece, and the second support plate 16 17 by fixing the right rear end portion of the horizontal mounting plate 18 to the upper end of the front bent portion, and fixing the right end portion of the horizontal mounting plate 18 to the liquid receiver 15 via the fixture 24, The horizontal mounting plate 17 is supported by the support plates 16 and 17 and the liquid receiver 15, and the electrical box 19 is mounted on the horizontal mounting plate 18.
[0010]
The oil separator 13 is fixed to the unit base 10 via a fixture 20 at the rear of the horizontal mounting plate 18 as viewed from above, and similarly to the second support plate 17 at the rear of the horizontal mounting plate 18. The gas-liquid separator 14 is fixed in a floating state through the fixture 21 without contacting the unit base 10. The support plate 17 also supports the horizontal mounting plate 18 but mainly supports the gas-liquid separator 14. Further, the dry core 23 is fixed to the second support plate 17 through the fixing tool 22 in a floating state without contacting the unit base 10. The oil separator 13 separates oil contained in the high-temperature and high-pressure refrigerant gas discharged from the compressors 11 and 12.
[0011]
The liquid receiver 15 stores the refrigerant liquefied by the external condenser, and is fixed on the unit base 10 on the back side of the compressor 12 and on the right side of the electrical box 19.
[0012]
Hereinafter, description will be made mainly based on FIG. The compressors 11 and 12 are connected in parallel to the gas-liquid separator 14 via service valves 30 and 31, respectively, and the service stop valve 32 is connected to the oil separator 13 connected to the high-pressure gas outlet pipe 34. , 33, the compressors 11 and 12 are connected in parallel. The oil separator 13 separates oil from the refrigerant, but also serves as an oil tank for storing the separated oil. The oil separator 13 serves as a service stop valve 35, a strainer 36, electromagnetic valves 37 and 38, and a capillary tube 39. , 40 to the compressors 11 and 12.
[0013]
An air-cooled or water-cooled outside-body condenser 41 connected to the high-pressure gas outlet pipe 34 by welding condenses and liquefies high-temperature and high-pressure refrigerant from the compressors 11 and 12. The other end is welded to the high-pressure liquid inlet 43 and further connected to the liquid receiver 15 via a service stop valve 42. The liquid receiver 15 is connected to the high-pressure liquid outlet 48 via the service valve 44, the dry core 23, and the moisture indicator 45. 49 is a fusible stopper for preventing the receiver 15 from exploding due to a high temperature such as a fire.
[0014]
In addition, a low-pressure gas inlet 50 connected to an external airframe evaporator (not shown) is connected to the gas-liquid separator 14 via a strainer 51. Further, on the high pressure side of each of the compressors 11 and 12, high pressure switches 52 and 53 for detecting the abnormal high pressure and protecting the compressors 11 and 12 include capillary tubes 54 for pressure stabilization, 55 is connected. As shown in FIG. 1, the high-pressure switches 52 and 53 are attached to the upper part of the liquid receiver 15 up and down via attachment fittings 56.
[0015]
Service stop valves 57 and 58 are provided between the compressors 11 and 12, and a digital low-pressure pressure switch for controlling the capacity of the compressors 11 and 12 is disposed between the service stop valves 57 and 58. 60 is connected. The digital low-pressure switch 60 serves as both a low-pressure switch and a low-pressure gauge, and is attached to the upper part of the receiver 15 via the mounting plate 61 so as to be adjacent to the high-pressure switch 53. A high pressure gauge 62 is connected between the oil separator 13 and the service stop valve 32 via a capillary tube 63, and the high pressure is located above the digital low pressure switch 60 via the mounting plate 61. It is installed adjacent to the pressure switch 52.
[0016]
Even when a soundproof exterior panel is mounted above (in the same height as the horizontal mounting plate 18), front and both sides of the compressors 11 and 12, the height of the receiver 15 is high. The height is higher than that of the horizontal mounting plate 18, and the high pressure switches 52 and 53, the digital low pressure switch 60, and the high pressure gauge 62 are connected to the horizontal mounting plate 18 above the liquid receiver 15. The apparatus can be visually observed by providing it at a high position.
[0017]
Further, the high pressure liquid refrigerant is evaporated to the receiver 15 and returned to the compressors 11 and 12 through service valves 64 and 46, strainers 65 and 47, solenoid valves 68 and 69, and capillary tubes 72 and 73. Thus, a liquid injection pipe 66 is connected for cooling the compressors 11 and 12 with the heat of vaporization and controlling the compressor capacity. Reference numerals 70 and 71 denote thermo valves (injection control valves), which are connected in parallel with the capillary tubes 72 and 73 between the electromagnetic valves 68 and 69 and the compressors 11 and 12, respectively. The thermo valves 70 and 71 are provided with temperature sensing cylinders 74 and 75 attached to the discharge side pipes of the compressors 11 and 12, respectively, and liquid is discharged when the discharge gas refrigerant temperature of the compressors 11 and 12 becomes high. Control is performed to increase the amount of refrigerant flowing into the compressors 11 and 12 and to decrease the temperature when the temperature decreases. The service valve 64 is normally open, and is closed only when the compressors 11 and 12, the electromagnetic valves 68 and 69, the thermo valves 70 and 71 are replaced due to a failure, or during maintenance.
[0018]
Reference numeral 76 denotes a U-shaped mounting plate for mounting a temperature-injecting liquid injection functional element of the compressor 11, and a mounting portion 77 bent horizontally at the lower end is a unit between the compressors 11 and 12. It is fixed to the front part of the base 10 with screws. The service valve 64 is screwed to the vertical plate A78 in a state where the service valve 64 is inserted into the notch 79 of the vertical plate A78 of the mounting plate 76, and the strainer 65 attaches the fixture 80 surrounding the strainer 65 to the vertical plate A78. The solenoid valve 68 is fixed by screwing to the left part of the vertical plate B81, and the thermo valve 70 fixes the fixture 82 surrounding the valve to the left end of the vertical plate A78. It is fixed by screwing.
[0019]
Similarly, the temperature protection liquid injection functional element of the compressor 12 is also attached to a mounting plate (not shown) disposed on the right side of the compressor 12. That is, as described above, the service valve 46 is screwed to the vertical plate A in a state where the service valve 46 is inserted into a notch (not shown) of the vertical plate A (not shown) of the mounting plate (not shown). 47 is fixed by screwing a fixing tool (not shown) surrounding the strainer 47 to the right end of the vertical plate A, and the electromagnetic valve 69 is fixed to a vertical plate B (not shown) of the mounting plate (not shown). The thermo valve 71 is fixed to the left end portion of the vertical plate A (not shown) by screwing a fixing tool (not shown) surrounding the valve. Fixed.
[0020]
The refrigerator unit of the present embodiment configured as described above is welded to a refrigerant pipe of a condenser outside the machine body or an evaporator outside the machine body. The high-temperature and high-pressure gas refrigerant compressed by the compressors 11 and 12 is supplied to the condenser 41 outside the fuselage via the service stop valve 32 and the oil separator 13, where it is condensed and liquefied. It is stored in the liquid receiver 15 through the valve 42.
[0021]
From the liquid receiver 15, the high-pressure liquid refrigerant is decompressed and expanded by passing through an expansion valve connected to the refrigerator unit through the service valve 44, the dry core 23, and the moisture indicator 45, and supplied to the external evaporator. The refrigerating machine unit exhibits a cooling capacity due to heat absorption by being evaporated. Then, the low-pressure refrigerant gas enters the gas-liquid separator 14 of the refrigerator unit via the strainer 51, and after gas-liquid separation, only the gas component returns to the compressors 11 and 12 via the service valves 30 and 31. And recompressed, repeating the above refrigeration cycle.
[0022]
As described above, since the high-temperature gas refrigerant is discharged from the compressors 11 and 12, the temperature of the discharge side piping of each of the compressors 11 and 12 rapidly increases. At the same time when the compressors 11 and 12 are started, the control device in the electrical box 19 opens the electromagnetic valves 68 and 69. Then, a part of the liquid refrigerant flows from the liquid receiver 15 into the liquid injection pipe 66 and is divided. When the temperature of the discharge side pipe rises, the thermovalves 70 and 71 increase the valve opening, supply the liquid refrigerant to the compressors 11 and 12, and increase the temperature of the discharge gas refrigerant of the compressors 11 and 12. Reduce.
[0023]
【The invention's effect】
As described above, the present invention can reduce the installation space of the refrigerator unit. In addition, since a pressure switch and a pressure gauge for detecting the abnormal pressure at the upper part of the vertical liquid receiver and protecting the compressor are mounted, even when a soundproof exterior panel is mounted in front of the compressor, The pressure switch and pressure gauge can be visually observed.
[Brief description of the drawings]
FIG. 1 is a front view of a refrigerator unit.
FIG. 2 is a plan view of the refrigerator unit.
FIG. 3 is a refrigerant circuit diagram of the refrigerator unit.
FIG. 4 is a front view of a liquid injection functional element for temperature protection of a compressor of a refrigerator unit.
FIG. 5 is a plan view of a liquid injection functional element for temperature protection of the compressor of the refrigerator unit.
FIG. 6 is a front view of a conventional refrigerator unit.
FIG. 7 is a plan view of a conventional refrigerator unit.
FIG. 8 is a right side view of a conventional refrigerator unit.
[Explanation of symbols]
10 Unit bases 11 and 12 Compressor 15 Receivers 52 and 53 High pressure switch 60 Digital pressure switch 62 High pressure gauge

Claims (2)

A compressor unit provided on a unit base and a vertical liquid receiver higher than the compressor are fixed, and a refrigeration unit that constitutes a refrigeration cycle by pipe connection to an external fuselage, an external condenser, etc. An upper part of the vertical liquid receiver, which is attached to at least a position higher than the compressor, is attached to the attachment plate, and detects an abnormal pressure of the receiver. A refrigerator unit comprising a pressure switch and a pressure gauge for protecting the compressor . 2. The refrigerator unit according to claim 1, wherein a soundproof exterior panel is attached in front of the compressor .

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