JP2011038599A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a refrigerator's noise and vibration by absorbing vibration of a compressor of the refrigerator efficiently. <P>SOLUTION: A vibration isolating device 5 which is provided between a base member 3 of compressor mount space of the refrigerator and a compressor 2 is provided with an upper rubber member 7 and a lower rubber member 8 which are attached to the upper end and lower ends of a coil spring 6, respectively and is configured so that a strut 9 fixed to the base member 3 is inserted into a through-hole of device's center axis provided on a central portion of each of the upper and lower rubber members 7, 8 and a center of the coil spring 6. The upper rubber member 7 is in non-contact state by maintaining a clearance 10 from the strut 9. The lower rubber member 8 has a hollow portion 11 which spreads in the horizontal direction rather than the diameter of the coil spring 6 and has an annular adhesion portion 12 which projects into the inside of the through-hole so as to closely contact the outer circumference of the strut 9. Thereby, the refrigerator is configured so that the hollow portion 11 is sealed by the lower rubber member 8, the strut 9 and the base member 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a technique for reducing vibration of an electric refrigerator equipped with a compressor.

  Electric refrigerators are equipped with electric compressors as refrigeration cycle equipment components. During operation of the compressor, a relatively large vibration noise is generated due to rotational vibration caused by an internal electric mechanism.

  As a technique for reducing this vibration, for example, an elastic member formed of an elastic material represented by rubber or the like is used as a vibration isolator, or a vibration isolator combining an elastic member and a coil spring is used. Is common. In order to reduce vibration more effectively, the spring property of the air inside the vibration isolator is also used.

  As a conventional example in which an elastic member is adopted as a constituent member of the vibration isolator, Patent Document 1 is cited, and as a conventional example of a vibration isolator combining an elastic member and a coil spring, Patent Document 2 is cited.

  FIG. 6 is a diagram showing an outline of the vibration isolator disclosed in Patent Document 1, and the features thereof will be described with reference to FIG. The vibration isolator 5 made of an elastic material molded into a hollow, generally cylindrical shape is installed between the compressor support leg 4 and the base member 3, and the central shaft portion extends from the upper surface to the lower surface of the vibration isolator 5. A through hole leading to is formed. The position is determined by installing it on the base member 3 with the support column 9 fixed to the base member 3 being inserted into the through hole, and at the same time, misalignment is prevented.

  The vibration generated by the operation of the compressor transmitted to the compressor support leg 4 mounted on the upper surface of the vibration isolator 5 is attenuated by the vibration isolator 5 before being transmitted to the base member 3. Yes. In addition, the side surface of the vibration isolator 5 is provided with a pore 14, and when a large displacement is applied, the displacement is suppressed by using a flow resistance when air inside the hollow gradually escapes from the pore 14, thereby reducing the displacement. On the other hand, a device is devised to reduce vibration transmitted to the base member 3 by the air compressed or expanded in the main body and inside acting as an air spring.

  FIG. 7 is a diagram showing an outline of the vibration isolator disclosed in Patent Document 2, and its features will be described with reference to FIG. The vibration isolator 5 has a substantially cylindrical shape including a coil spring 6 and an upper rubber member 7 and a lower rubber member 8 fitted on the upper and lower sides thereof. The vibration isolator 5 is installed between the compressor support leg 4 and the base member 3, a through hole is formed in the central shaft portion of the vibration isolator 5, and a support 9 fixed to the base member 3 in the through hole. Has been inserted.

  In the vibration isolator having such a configuration, the vibration transmission to the base member 3 is reduced by elastic deformation of the lower rubber member 8 and the coil spring 6. Further, the lower rubber member 8 is provided with a hollow portion 11 having a vent hole 15, and when vibration is generated and deformation is applied, the spring property of air compressed or expanded inside the hollow portion 11 is used. When air enters and exits from the air vent 15 according to the change in the volume of the hollow portion 11, a device is devised to reduce vibration by using energy loss due to the resistance of the generated air flow.

JP 2003-269534 A Japanese Utility Model Publication No. 01-035386

  The anti-vibration means of the electric compressor of the electric refrigerator is configured as described above. In the case of the conventional example shown in FIG. 6, in order to confine air in the hollow portion 11 inside the anti-vibration device 5, The vibration isolator 5 needs to be in close contact. For this purpose, the upper portion of the vibration isolator 5 adjacent to the compressor support leg 4 and the support column 9 are in close contact with each other.

  Therefore, the vibration generated in the compressor is transmitted to the column 9 before it is sufficiently damped by the vibration isolator 5 and further transmitted from the column 9 to the refrigerator main body via the base member 3. Since the vibration transmission path not passing through the apparatus is formed, there is a problem that the vibration isolation performance is lowered.

  In addition, the operation of an electric compressor in an electric refrigerator has been conventionally performed at a constant rotation speed. However, in recent years, variable operation speed control using an inverter has made the operation more efficient and reduced power consumption. It is common to plan.

  Therefore, the frequency and amplitude of vibration during operation change in a complicated manner by changing the rotation speed of the electric compressor. For this reason, the size and number of the pores 14 in the conventional example shown in FIG. 6 and the vent 15 in the conventional example shown in FIG. It is difficult to adjust the opening area to be optimal.

  For example, when the opening area of the pore 14 or the vent hole 15 is too small, sufficient resistance cannot be obtained because the air does not enter and exit. Further, for example, when the opening area of the pore 14 or the vent 15 is too large, there is a problem that the expected vibration reduction effect cannot be obtained because the flow rate of air increases but the resistance decreases. In addition, if the air inside the hollow is in and out, the effect as an air spring is also reduced, so that there is a further problem that the vibration reduction effect obtained is reduced.

  According to the present invention, the hollow portion provided in the vibration isolator is closed so that air does not enter and exit, and the vibration reduction effect due to the elasticity of air is reliably obtained. A low-vibration refrigerator that responds to changes in the rotational speed of the compressor can be obtained by obtaining a structure that does not deteriorate vibrations by forming a vibration transmission path directly to the base member without going through a vibration isolator. The main purpose is to provide.

  Further, as another object, in addition to achieving the main object, a costly manufacturing process such as rubber hollow molding is used as a means for forming the closed hollow part when the main object is achieved. It is to achieve at a low cost without need.

  Means for achieving the main object includes a vibration isolator comprising a coil spring and upper and lower elastic members made of an elastic material attached in series with the coil spring at the upper and lower ends of the coil spring; The upper and lower elastic members and a column that passes through the central portion of the coil spring and is fixed to the base member; a compressor support leg mounted on the upper elastic member; and the compressor support leg. In the refrigerator including the supported compressor, the upper elastic member has a gap set between the upper elastic member and the outer periphery of the column, and the lower elastic member is formed outside the column. A close contact portion that is in close contact with the surroundings, a hollow portion that is positioned below a portion that receives the coil spring, and an opening in the lower portion, wherein the lower portion of the upper elastic member is the base Front by being installed on the member It is closed by a base member, and the hollow portion is closed by the support column, the base member, and the elastic member, and a configuration is adopted in which a hole that allows ventilation between the inside and the outside of the hollow portion is eliminated. .

  According to such a configuration, since the gap between the upper elastic member and the column interrupts the transmission of vibration from the compressor, the vibration transmission path from the upper elastic body to the base member via the column is blocked, and the vibration of the refrigerator Noise can be reduced. Further, the vibration transmitted to the upper elastic body is attenuated and reduced by the coil spring and transmitted to the lower elastic member, and the hollow portion also functions as an air chamber of the air spring in the lower elastic member to attenuate and reduce the vibration. Reduces refrigerator vibration and noise.

  More preferably, by adopting a configuration in which the hollow portion is provided with reinforcing ribs in the vertical direction, the vertical strength of the hollow portion of the lower elastic member is improved, and vibration damping due to the collapse of the hollow portion It can suppress that the reduction function falls.

  As described above, according to the problem solving means of the present invention, it is possible to provide a refrigerator with less vibration and noise by effectively blocking vibration transmission from the compressor to the base member on which the compressor of the refrigerator is installed.

1 is a rear perspective view of an electric refrigerator according to a first embodiment of the present invention. It is an expansion detailed longitudinal cross-sectional view of the vibration isolator of FIG. It is a longitudinal cross-sectional view of the non-invention vibration isolator which does not have the hollow part produced as a comparison when carrying out the experiment of the anti-vibration characteristic of the vibration isolator by the Example of this invention. It is a graph which shows the comparison of the frequency response function of each vibration isolator which has the structure of FIG. 2 (with a hollow part) and FIG. 3 (without a hollow part). The elevation view (A figure), AA sectional drawing (B figure), and BB sectional drawing (C figure) of the lower rubber member of the vibration isolator by 2nd Example of this invention were shown together. FIG. It is explanatory drawing which shows the content of patent document 1. FIG. It is explanatory drawing which shows the content of patent document 2. FIG.

  In the embodiment of the present invention, in order to solve the problem described in the column of problems to be solved by the above-described invention, the coil spring 6 is respectively placed above and below the compressor support leg 4 and the base member 3 of the electric refrigerator. A substantially cylindrical vibration isolator having a configuration in which upper and lower elastic members are fitted to each other is installed, a central shaft portion of the vibration isolator has a through hole, and a support column 9 fixed to the base member 3 in the through hole. In the refrigerator having a structure in which the coil spring 6 is inserted, a gap 10 is provided between the upper rubber member 7 as the upper elastic member attached to the upper end of the coil spring 6 and the support 9, and the lower elastic member attached to the lower end of the coil spring 6. As a lower rubber member.

  The lower rubber member 8 forms a disk-shaped hollow portion 11 having a diameter larger than the outer diameter of the coil spring 6, and the hollow portion 11 is completely closed with its entire outer periphery covered with only an elastic member. Instead of a space, the bottom surface adjacent to the base member 3 on the bottom surface side and the surface on the through hole side in contact with the support column 9 are not formed with a wall surface by an elastic member, but are formed in an open shape connected to the outside.

  The lower rubber member 8 as the lower elastic member is provided with a close contact portion 12 having a shape protruding inward in a circumferential shape (annular) above the hollow portion 11 in a portion adjacent to the support on the through hole side. 9 and close without any gaps around the circumference.

  Also, the bottom rubber surface of the lower rubber member 8 (bottom surface) is not provided with unevenness and is in close contact with the base member 3 without any gap, and the lower rubber member 8, the support column 9 and the base member 3 are installed in a state where the vibration isolator is installed. Thus, a sealed donut-shaped hollow portion 11 that does not allow external air to enter and exit as viewed from the hollow portion 11 is formed, and a vibration-proof support structure for a compressor having a structure without a vent hole in the lower rubber member 8 is provided. Use a refrigerator.

  According to the embodiment of the present invention, the upper rubber member 7 is not in contact with the support column 9 while maintaining the gap 10, or even if contacted, the upper rubber member 7 is limited to a partial contact. 6 and before being sufficiently damped by the upper and lower rubber members 7, 8, it is transmitted directly from the column 9 to the base member 3, the refrigerator main body 1, and as a result, the vibration isolator 5 does not function sufficiently. Can be prevented.

  Further, the annular close contact portion 12 provided on the inner wall surface on the through hole side of the lower rubber member 8 is in close contact with the support 9 without any gap, and the bottom surface of the lower rubber member 8 is installed in close contact with the base member 3. Therefore, a donut-shaped hollow portion 11 is formed that is sealed by the three members of the lower rubber member 8, the support column 9, and the base member 3, and air is confined in the hollow portion 11.

  When the hollow portion 11 is deformed by vibration or the like, it acts as an air spring not only by elastic deformation of the lower rubber member 8 but also by compression or expansion of the internal air, so that the cushioning property of the vibration isolator 5 is increased. Therefore, it contributes to vibration reduction.

  Further, since the outer diameter of the doughnut-shaped hollow portion 11 is larger than the outer diameter of the coil spring 6, the coil spring 6 is placed on the upper wall surface of the hollow portion 11. By doing in this way, it becomes the structure in which the hollow part 11 exists directly under the coil spring 6, and the downward direction via the said upper wall surface of the hollow part 11 can be made into a hollow part, By such structure, coil spring The hollow portion 11 is easily deformed by the force from 6.

  Of course, since the vibration from the compressor 2 transmitted to the lower rubber member 8 is mainly via the coil spring 6, the hollow portion is easily deformed by the above configuration, and the internal air is effectively removed. It can be used as a spring to effectively reduce vibration damping.

  Here, considering the case where the sealed donut-shaped hollow portion 11 is formed only by the lower rubber member 8 without depending on the above three, a special process such as hollow molding is required at the time of manufacture, For example, the rubber member 8 is divided into two parts to increase the number of parts, which causes an increase in cost.

  However, in the embodiment of the present invention, the wall surface forming the sealed hollow portion 11 is not only the lower rubber member 8 but also the structure of the hollow portion 11 formed by a combination of the support 9 and the base member 3. Therefore, considering that the material of the lower rubber member is flexible due to rubber, even if it has a shape that causes some undercutting, it can be molded and released by a normal upper and lower die, and the lower rubber There is no increase in cost due to the complexity of the mold structure used when the member 8 is manufactured.

  As described above, the upper rubber member 7 and the support 9 attached in series to the upper end of the coil spring 6 of the vibration isolator are non-contacted, and the lower rubber member 8 and the support 9 attached in series to the lower end of the coil spring 6 A sealed hollow portion 11 formed by three members of the base member 3 is provided, and is confined in the sealed hollow portion 11 in addition to the elastic deformation of the coil spring 6 and the elastic deformation of the upper and lower rubber members 7 and 8. The vibration from the compressor 2 that is about to be transmitted to the base member 3 and the refrigerator main body 1 is increased regardless of the rotational speed of the compressor by increasing the vibration absorption capacity by utilizing the air spring property of the generated air. The embodiment of the present invention can provide a low-vibration refrigerator that can effectively attenuate and reduce the manufacturing cost as much as possible.

  FIG. 1 is a rear perspective view of a refrigerator showing a first embodiment of the present invention. The refrigerator body 1 is provided with a space for installing the compressor 2. The compressor 2 is installed on the base member 3, and the vibration isolator 5 is placed between the compressor support leg 4 and the base member 3. By installing them at the four corners of the support legs 4, the operation vibration of the compressor 2 transmitted from the compressor support legs 4 to the base member 3 and further to the refrigerator main body 1 is reduced.

  FIG. 2 is a schematic view of the vibration isolator 5 of the present embodiment. The weight of the compressor 2 is at most 10 kg, and the vibration isolator 5 that takes up one quarter of the weight is a substantially cylindrical shape, and its size is determined in consideration of space saving of the compressor installation space. 5 is preferably small, and when the compressor is mounted, the diameter is D ≦ 35 mm, and the height from the base member 3 to the lower surface of the compressor support leg 4 is H ≦ 30 mm.

  The vibration isolator 5 includes a coil spring 6 and an upper rubber member 7 and a lower rubber member 8 that are respectively fitted to the top and bottom of the coil spring 6. A through hole is formed in the central shaft portion of the vibration isolator 5. The support column 9 fixed to the base member 3 is inserted and installed.

  A compressor support leg 4 is placed on the upper surface of the upper rubber member 7, and the vibration isolator 5 supports the compressor 2 with vibration isolation. Since a gap 10 is provided between the upper rubber member 7 and the support column 9 to prevent contact between the upper rubber member 7 and the support column 9, the support column is positioned before the vibration is reduced by the coil spring 6 or the lower rubber member 8. 9. Further, there is no reduction in the vibration reduction effect due to the formation of a path through which vibration is transmitted to the base member 3.

  In the lower rubber member 8, a hollow portion 11 on a disk having a diameter larger than the diameter of the coil spring 6 is formed below the coil spring 6. However, the hollow portion 11 of the lower rubber member 8 has a through-hole portion for inserting the support column 9 and an open shape in which a wall surface is not provided on a part of the lower surface, and the outer periphery of the support column 9 is formed above the hollow portion 11. A shape for positioning the vibration isolator 5 by contact is provided, but this is used as a close contact portion 12 with no gaps around the entire circumference, and the lower surface is opened by close contact with the base member 3. The hollow part 11 is a donut-shaped closed space.

  The vibration generated by the operation of the compressor 2 is transmitted in the order of the compressor support leg 4, the vibration isolator 5, the base member 3, and the refrigerator body 1. In the vibration isolator 5, the elastic deformation of the coil spring 6 and the elasticity of the rubber Not only the deformation but also the hollow portion 11 is deformed and acts as an air spring when the trapped air is compressed or expanded, so that the cushioning property increases the vibration reduction effect and transmits it to the base member 3 and the refrigerator main body 1. It is possible to reduce vibrations that occur.

  The reason why the diameter of the hollow portion 11 is made larger than the diameter of the coil spring 6 is that the hollow portion 11 is deformed by the direct action of the force received from the coil spring on the upper outer wall surface of the hollow portion 11. This is to make it easier to obtain the effect of the air spring.

  In the shape of the vibration isolator shown in FIG. 2, the height from the base member 3 to the lower surface of the compressor support leg 4 is set in consideration of the dimension range of H ≦ 30 mm, and the installation surface height of the coil spring 6 of the lower rubber member 8 is h. ≦ 10 mm. In order not to lose the effect of the air spring, the rubber thickness of the outer wall of the hollow portion 11 depends on the weight of the compressor and the amount of deformation due to vibration so long as the hollow portion 11 is not crushed and the upper and lower surfaces do not contact even during vibration. It can be changed.

  FIG. 4 shows the frequency by the finite element method analysis in the case of the vibration isolator shown in FIG. 2 having the hollow portion 11 as described above and in the case of the shape without the hollow portion 11 like the vibration isolator shown in FIG. It is a graph which shows the result of having calculated | required the response function and compared, and makes a horizontal axis | shaft frequency and the vertical axis | shaft being the acceleration of a vibration.

  As can be seen from the graph, there is a natural frequency showing a high peak of vibration acceleration in the vibration isolator without the hollow portion 11, and the peak is shown at the same frequency even in the case of the shape provided with the hollow portion 11. However, a 50% to 80% decrease in acceleration magnitude is observed, confirming that a significant vibration reduction effect can be obtained.

  Further, the lower rubber member 8 is provided with a partial wall surface in order to increase the contact area with the base member 3 and improve the sealing performance. Since the material of the member 8 is a flexible rubber, it is possible to perform the mold release without any problem even if it is integrally formed by a simple upper and lower mold, and there is no increase in manufacturing cost due to the complicated mold structure. There is.

  FIG. 5 is a view showing the shape of the lower rubber member 8 employed in the vibration isolator 5 according to the second embodiment of the present invention. The structure other than the lower rubber member 8 is the same as that of the first embodiment described above, and a plurality of reinforcing ribs 13 are provided in the hollow portion 11 of the lower rubber member 8 so as to receive at least a load in the vertical direction. Is different.

  In this 1st Example, it is set as the structure which hold | maintains a hollow state only with the intensity | strength of the outer wall of the hollow part 11, and the spring property of air, but when the weight and vibration of the compressor to mount are large, a hollow part upper surface and lower surface It is also conceivable that it becomes difficult to hold the hollow due to contact. In such a case, it is possible to maintain the hollow state by providing the reinforcing rib 13 in the hollow portion 11 and maintain the effect of the air spring.

  As described above, the following technical matters are disclosed in the embodiments of the present invention. That is, a compressor installation structure in which a vibration isolator that combines a member made of an elastic material typified by rubber and a coil spring is provided between the base member of the installation space of the compressor of the refrigerator and the compressor. In the refrigerator, the vibration isolator has a substantially cylindrical shape in which an elastic member made of an elastic material is fitted to the coil spring and the upper and lower portions of the coil spring, respectively. There is a through hole that communicates from the lower surface to the upper surface, and a support post fixed to the base member is inserted into the through hole of the vibration isolator, and the elastic member above the coil spring and the post are in non-contact with the vibration isolator. A disc-shaped hollow portion having a diameter larger than that of the coil spring is formed in the elastic member below the coil spring, and the hollow portion is hermetically sealed with only the elastic member. shape Wasezu struts are shaped to open without providing the wall surface adjacent to the pillar outer peripheral surface in the through hole to be inserted, it may not be provided in the wall of the bottom portion of the coil spring lower part of the elastic member.

  Further, in the state in which the vibration isolator is installed on the base member, the hollow wall is formed on the inner wall surface of the through hole provided in the elastic member under the coil spring so that the vibration isolator is in close contact with the support without any gap. The above-mentioned open hollow part is formed in a part positioned above the support part, and the bottom side of the elastic member below the coil spring is in close contact with the base member so that there is no gap. Close with a closed state with no air in and out.

  In the second embodiment of the present invention, in addition to the technical matters described above, a reinforcing rib is provided between the upper surface and the lower surface of the hollow portion formed in the elastic member below the coil spring of the vibration isolator, so that a large load is applied. It is equipped with technical matters that will not lose the action of the air spring even if it is received.

  INDUSTRIAL APPLICABILITY The present invention has industrial applicability to a vibration isolator equipped with a refrigerator compressor.

DESCRIPTION OF SYMBOLS 1 Refrigerator main body 2 Compressor 3 Base member 4 Compressor support leg 5 Vibration isolator 6 Coil spring 7 Upper rubber member 8 Lower rubber member 9 Strut 10 Crevice 11 Hollow part 12 Contact part 13 Reinforcement rib

Claims (2)

A vibration isolator comprising a coil spring and upper and lower elastic members made of an elastic material attached in series to the coil spring at the upper and lower ends of the coil spring;
Struts that are passed through the central portion of the upper and lower elastic members and the coil spring and fixed to the base member,
A compressor support leg mounted on the upper elastic member;
In a refrigerator comprising a compressor supported by the compressor support legs,
The upper elastic member has a gap set between the upper elastic member and the outer periphery of the support column,
The lower elastic member has a configuration having a close contact portion that is in close contact with the outer periphery of the support, a hollow portion that is positioned below a portion that receives the coil spring, and an opening in the lower portion.
The opening is closed by the base member by installing the lower part of the upper elastic member on the base member,
The said hollow part is closed by the said support | pillar, the said base member, and the said elastic member, and the structure which eliminated the hole which permits the ventilation | gas_flowing in the said hollow part and the exterior is employ | adopted.   The refrigerator according to claim 1, wherein the hollow portion includes a reinforcing rib in the vertical direction.

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