JP4726592B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator having a discharge muffler on the discharge side of a compressor, and in particular, discharges high-temperature and high-pressure refrigerant compressed by the compressor to the discharge muffler via a discharge pipe and a high-pressure side pipe. It relates to a refrigerator.

  In showcases installed in stores such as supermarkets and convenience stores, product display shelves are cooled by refrigerators. This refrigerator is composed of a cooling unit composed of a cooler (evaporator), decompression means, and the like, and a heat source side condensing unit composed of a compressor, a radiator, and the like.

Conventionally, in this type of condensing unit of a refrigerator, vibration is generated by the operation of the compressor, and this vibration is transmitted to the piping connected to the compressor, causing noise, and the connecting portion of the piping is damaged by the vibration. As a result of the inconvenience, various vibration countermeasures have been taken (see, for example, Patent Document 1).
JP 2005-172258 A

  The high-temperature and high-pressure refrigerant gas compressed by the compressor has considerable pulsation, and the pulsation is one of the causes of the vibration and noise. Therefore, in order to reduce the pulsation of the high-temperature and high-pressure refrigerant gas, a refrigerator having a discharge muffler attached to the discharge side of the compressor has been developed. However, since the discharge muffler has a sufficient volume and a complicated internal shape so as to reduce the pulsation of the high-temperature and high-pressure refrigerant gas, and has a heavy configuration, the discharge muffler from the discharge pipe of the compressor to the discharge muffler When the high-pressure side pipe in the middle becomes longer, the natural frequency becomes lower, which causes a problem that it is difficult to reduce the vibration.

  In particular, since the frequency generated when the refrigerator is transported is about 20 Hz, the frequency and the natural frequency resonate, and the discharge muffler slowly shakes greatly. In the worst case, the connecting pipe portion There was a risk of damage.

  The present invention has been made to solve the conventional technical problems, and an object of the present invention is to reduce shaking of the discharge muffler in a refrigerator having a discharge muffler attached to the discharge side of the compressor. .

That is, the refrigerator of the present invention has a discharge muffler attached to the discharge side of the compressor, and includes a high-pressure side pipe connected between the discharge pipe of the compressor and the discharge muffler, and a high-pressure side pipe from the discharge pipe. And a service valve that is interposed in the middle of the high-pressure side pipe .

  According to the refrigerator of the present invention, since the high-pressure side pipe connected between the discharge pipe of the compressor and the discharge muffler, and a delivery bracket fixed to the middle of the high-pressure side pipe from the discharge pipe, The distance of the high-pressure side pipe from the discharge pipe to the discharge muffler is divided by the difference fitting into the distance from the discharge pipe to the difference fitting and the distance from the difference fitting to the discharge muffler.

  Thereby, since the distance of each part becomes short, each natural frequency can be made high. Therefore, it is possible to avoid the disadvantage that the vibration of the discharge muffler becomes large due to resonance with low vibration during transportation, and the reliability can be improved.

Furthermore, by fixing the service valve installed in the middle of the high-pressure side piping to the delivery bracket , the delivery bracket also serves as a mounting bracket for securing the service valve. The production cost can be reduced.

  In general, a highly reliable refrigerator can be provided at low cost.

  The present invention is a refrigerator in which a discharge muffler is attached to the discharge side of a compressor, and is made to reduce the shake of the discharge muffler. In particular, the vibration during transportation and the natural frequency resonate. This eliminates the inconvenience of damaging the pipe connection part. The purpose of reducing the swing of the discharge muffler and avoiding damage in advance is that the high-pressure side pipe connected between the discharge pipe of the compressor and the discharge muffler, and the midway between the discharge pipe and the high-pressure side pipe Realized by fixing with metal fittings. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 is a refrigerant circuit diagram of a refrigerator 1 according to an embodiment of the present invention, FIG. 2 is a perspective view of a condensing unit 2 of the refrigerator 1, FIG. 3 is a front view of the condensing unit 2, and FIG. Each side view of the unit is shown. In each figure, 1 is a refrigerator of the present invention, and the refrigerator 1 of the embodiment is a showcase for refrigeration or freezing of goods installed in a store such as a supermarket, for example, from the condensing unit 2 and the cooling unit 3. Composed. Therefore, the cooling unit 3 is a showcase body or a cooling coil.

  That is, the refrigerator 1 of the present embodiment includes a heat source side condensing unit 2 including a compressor 10, a discharge muffler 12, an oil separator 13, a radiator 15, an accumulator 18, and the like, an expansion valve 16 as a pressure reducing means, evaporation A refrigerant circuit 4 is composed of a cooling unit 3 including a cooler (cooler) 17.

  The compressor 10 includes an electric element as a driving element (not shown) in the hermetic container 20 and a compression element driven by the electric element. The sealed container 20 includes a vertical cylindrical container body 20A that houses an electric element and a compression element therein, and a substantially bowl-shaped end cap (lid member) 20B that closes the upper end opening of the container body 20A. And the bottom part of 20 A of container main bodies is being fixed to the unit base 7 via the elastic material etc. Further, one end of a suction pipe 30 for introducing the refrigerant into the compression element is connected to the upper side of the container body 20A. The other end of the suction pipe 30 is connected to the outlet side of the accumulator 18. The accumulator 18 is for avoiding the disadvantage that liquid refrigerant is sucked into the compressor 10 and liquid-compressed.

  Further, one end of a discharge pipe 32 for discharging the high-temperature and high-pressure refrigerant compressed by the compression element of the compressor 10 to the outside of the sealed container 20 is connected to the center of the upper end of the end cap 20B. The end cap 20B is attached with a terminal for feeding power to the driving element in the sealed container 20, and the outside of the terminal is covered with a terminal cover 21 to protect the terminal. .

  The discharge pipe 32 rises upward from one end penetratingly connected to the end cap 20 </ b> B, and the other end at the tip is connected to the upstream pipe 33 </ b> H of the high-pressure side pipe 33. The high-pressure side pipe 33 is a refrigerant pipe connected between the discharge pipe 32 and the discharge muffler 12, and includes two refrigerant pipes, an upstream side pipe 33H and a downstream side pipe 33L. That is, the inlet end of the upstream side pipe 33 </ b> H is bolted to the other end (outlet end) of the discharge pipe 32 of the compressor 10. The outlet end of the downstream pipe 33L is fixed to the inlet of the discharge muffler 12 by welding.

  The outlet end of the upstream side pipe 33H and the inlet end of the downstream side pipe 33L are connected to and communicated with the connection port on the inlet side and the connection port on the outlet side of the service valve 40, respectively. That is, the service valve 40 is provided in the middle of the high-pressure side pipe 33. The service valve 40 is a service pipe for sealing refrigerant, oil, or the like in the refrigerant circuit 4, and other than the connection port connected to the outlet end of the upstream side pipe 33H and the inlet end of the downstream side pipe 33L. In addition, another service connection port 42 is provided, and the refrigerant, oil, and the like are sealed from the connection port 42. The connection port 42 of the normal service valve 40 is closed by a plug member (not shown).

  The discharge muffler 12 is a muffler chamber provided to reduce the pulsation of the high-temperature and high-pressure refrigerant gas compressed by the compressor 10, and the discharge muffler 12 has sufficient capacity to reduce the pulsation of the refrigerant gas. It has a volume and exhibits a complicated internal shape. In addition, since a high-temperature and high-pressure refrigerant gas is discharged into the discharge muffler 12, the structure is heavy, and thus is installed below the unit base 7 of the condensing unit 2.

  A refrigerant pipe 35 connected to the outlet of the discharge muffler 12 is connected to the inlet of the oil separator 13. The oil separator 13 is for separating oil mixed in the refrigerant gas. The oil separated by the oil separator 13 is returned to an oil reservoir formed at the bottom of the hermetic container 20 of the compressor 10 through an oil pipe (not shown). Similar to the compressor 10, the bottom of the oil separator 13 is fixed to the unit base 7. The outlet of the oil separator 13 is connected to the inlet of the radiator 15 through the refrigerant pipe 36.

  The radiator 15 includes a refrigerant pipe 15A arranged in a meandering manner, a plurality of fins (not shown) through which the refrigerant pipe 15A is inserted, and a fan 15F for ventilating the fins. The refrigerant pipe 37 connected to the outlet of the radiator 15 is connected to the refrigerant pipe 60 of the cooling unit 3 through a valve device (not shown).

  The cooling unit 3 includes an expansion valve 16, an evaporator 17, and refrigerant pipes 60, 62, and 64 that connect them. The refrigerant pipe 60 is connected to the inlet of the expansion valve 16, and the refrigerant pipe 62 exiting the expansion valve 16 is connected to the inlet of the evaporator 17. The evaporator 17 is provided with a fan 17 </ b> F for blowing cool air heat-exchanged with the refrigerant in the evaporator 17 to a display shelf (inside the cabinet) of the showcase. A refrigerant pipe 64 exiting the evaporator 17 is connected to a refrigerant pipe 38 of the condensing unit 2 via a valve device (not shown), and the refrigerant pipe 38 is connected to an inlet of the accumulator 18.

  Here, in the middle of the discharge pipe 32 and the high-pressure side pipe 33, a delivery fitting 50 is installed (not shown in FIG. 1). The fitting 50 is a fitting that is fixed from the discharge pipe 32 to the high-pressure side pipe 33. The fitting 50 is formed by bending a metal plate having a predetermined thickness. That is, as shown in FIG. 5 to FIG. Consists of a lower surface 53 extending in the opposite direction. 5 is a diagram showing the arrangement of the upstream fitting 33H, the delivery pipe 50, the discharge pipe 32, and the high pressure side pipe 33, FIG. 6 is a front view of the delivery fitting 50, and FIG. 8 and 8 show side views of the fitting 50, respectively.

  A cutout portion 55 that is largely cut in a U shape is formed on one end of the upper surface 51 of the fitting 50 on the side opposite to the vertical surface 52, and the upstream side pipe of the high-pressure side pipe 33 is formed by the cutout portion 55. 33H is held. Bolt holes 56 and 56 for fixing the other end of the discharge pipe 32 and the inlet end of the upstream pipe 33H held by the notch 55 are formed on both sides of the notch 55. Yes. Then, with the upstream pipe 33H held in the notch 55, the inlet end and the other end of the discharge pipe 32 are aligned, and a bolt (not shown) is inserted and tightened from above the bolt holes 56, 56. One end of the fitting 50 is fastened together with the other end of the discharge pipe 32 and the inlet end of the upstream side pipe 33H constituting the high pressure side pipe 33.

  Further, a notch portion 57 that is largely cut downward is formed at the other end of the vertical surface 52 of the fitting 50, and the service valve 40 is inserted into the notch portion 57 and fixed thereto. Yes. In addition, holes 58, 58 formed on both lateral sides of the notch 57 are bolt holes for fixing the other end of the lateral surface of the fitting 50 and the service valve 40 with bolts. In this way, one end of the fitting 50 is fastened together with the other end that is the tip of the discharge pipe 32 and the inlet end of the upstream pipe 33H that constitutes the high-pressure pipe 33, and is connected to the other end of the fitting 50. In this case, the service valve 40 is fixed, whereby the transfer fitting 50 is fixed from the discharge pipe 32 to the high-pressure side pipe 33. Further, by fixing the other end of the fitting 50 to the service valve 40 as described above, the fitting 50 also serves as a mounting fitting for the service valve 40.

  Thus, by fixing the span fitting 50 in the middle of the discharge pipe 32 and the high-pressure side pipe 33, the distance of the high-pressure side pipe 33 from the discharge pipe 32 to the discharge muffler 12 is from the discharge pipe 32. The dimension of the upstream side pipe 33H of the high pressure side pipe 33 extending to the service valve 40 located at the other end of the fitting 50 and the dimension of the downstream side pipe 33L of the high pressure side pipe 33 extending from there to the discharge muffler 12 It will be divided into distances.

  Here, when the fitting 50 is not attached as in the conventional structure, the distance between the high-pressure side pipe 33 connected between the discharge pipe 32 and the discharge muffler 12 is not divided, and all the dimensions of the high-pressure side pipe 33, That is, the distance is very long corresponding to the sum of the dimensions of the upstream pipe 33H and the downstream pipe 33L. In this case, since the discharge muffler 12 is heavy as described above, when the length of the high-pressure side pipe 33 between the discharge pipe 32 and the discharge muffler 12 of the compressor 10 is increased, the fixed frequency is lowered accordingly, and the vibration is reduced. May promote the occurrence of

  In particular, the refrigerator 1 is usually transported in a state where the condensing unit 2 and the cooling unit 3 are separately assembled, and these pipes are connected at the installation location. Since the vibration frequency at the time of transportation is about 20 Hz, the vibration at the time of transportation and the natural frequency resonate, and the discharge muffler 12 shakes slowly and greatly. In the worst case, the vibration of the discharge muffler 12 causes a high pressure. There is a possibility that the connecting portion between the side pipe 33 and the discharge muffler 12, the connecting portion between the high-pressure side piping 33 and the discharging pipe 32, or the connecting portion between the discharge pipe 32 and the compressor 10 may be damaged.

  However, by fixing the high pressure side pipe 33 from the discharge pipe 32 to the middle of the high pressure side pipe 33 by using the cross fitting 50 as in the present invention, the high pressure side pipe 33 is connected to the upstream side pipe 33H by the cross fitting 50. And the distance of the dimension of the downstream pipe 33L. For this reason, each natural frequency of the high-pressure side pipe 33 becomes high. As a result, the shaking of the discharge muffler 12 can be reduced.

  In particular, since the natural frequency is increased, it is possible to avoid the disadvantage that the discharge muffler 12 is greatly swayed by resonating with low vibration during transportation. Can be resolved.

  In this way, the distance fitting 50 is fixed in the middle of the discharge pipe 32 and the high-pressure side pipe 33, so that the distance of the high-pressure side pipe 33 from the discharge pipe 32 to the discharge muffler 12 is different from the discharge pipe 32. This is divided into a distance to the service valve 40 in the middle of the high-pressure side pipe located at the other end of the crosspiece 50 and a distance to the discharge muffler 12 therefrom. That is, the high-pressure side pipe 33 is divided into the upstream side pipe 33H and the downstream side pipe 33L, and the distance between each part (the dimension of the upstream side pipe 33H and the dimension of the downstream side pipe 33L) is shortened and the respective natural frequency is high. This resonates with the vibration during transportation (low vibration 20 Hz) and the vibration becomes large and the risk of breakage is eliminated.

  Further, by fixing the service valve 40 at the other end of the delivery fitting 50 as in the present embodiment, the delivery fitting 50 also serves as an attachment fitting for securing the service valve 40, so the service valve 40 is secured. Therefore, it is not necessary to separately attach a mounting bracket, and the number of parts can be reduced.

  As described in detail above, according to the present invention, a highly reliable refrigerator 1 can be provided at low cost.

It is a refrigerant circuit diagram of the refrigerator of one Example of this invention. It is a perspective view of the condensing unit of the refrigerator of FIG. It is a front view of the condensing unit of FIG. It is a side view of the condensing unit of FIG. It is a figure which shows arrangement | positioning of the delivery fitting of the refrigerator of this invention, the upstream piping of high voltage | pressure side piping, and discharge piping. FIG. 6 is a front view of the delivery bracket of FIG. 5. FIG. 6 is a plan view of the transfer metal fitting of FIG. 5. It is a side view of the delivery metal fitting of FIG.

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Condensing unit 3 Cooling unit 10 Compressor 12 Discharge muffler 13 Oil separator 15 Radiator 16 Expansion valve 17 Evaporator 18 Accumulator 20 Sealed container 20A Container body 20B End cap 21 Terminal cover 30 Suction piping 32 Discharge piping 33 High pressure Side piping 33H Upstream piping 33L Downstream piping 35, 36, 37, 38, 60, 62, 64 Refrigerant piping 40 Service valve 50

Claims (1)

In a refrigerator with a discharge muffler attached to the discharge side of the compressor,
A high-pressure side pipe connected between the discharge pipe of the compressor and the discharge muffler;
With a fitting that is fixed from the discharge pipe to the high-pressure side pipe ,
A refrigerator having a service valve interposed in the middle of the high-pressure side pipe fixed to the delivery bracket .

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