JP2013024067A - Fixing device for cover of electric component of compressor - Google Patents

Abstract

An object of the present invention is to provide an electrical component cover fixing device for a compressor with low noise and high productivity by suppressing resonance between a mounting flat portion of a hermetic container and a bracket.
A bracket 104 includes a plurality of welding projections 107 projecting toward the sealed container side, and at least one or more contact portions that are in contact with other than the welded portion are provided between the mounting flat surface portion and the bracket 104. Even when the flatness of the mounting flat portion or the main body portion 104b of the bracket 104 is insufficient, the mounting flat portion 102 and the bracket 104 are surely brought into contact with each other at the contact portion. Can be suppressed. As a result, it is possible to provide an electrical component cover fixing device for a compressor with low noise and high productivity.
[Selection] Figure 2

Description

  The present invention relates to an electrical equipment cover fixing device for a compressor mainly used in a household refrigerator or the like.

  Conventionally, as an electrical component cover fixing device of this type of compressor, a method of fixing an electrical component cover by pressing it against a sealed container with a spring or the like has been common (see, for example, Patent Document 1).

  However, in recent years, for the purpose of improving workability, there has been proposed a method of fixing an electrical component cover with one touch without using a part such as a spring (see, for example, Patent Document 2).

  Hereinafter, the conventional electrical component cover fixing device for a compressor will be described with reference to the drawings.

  13 is an exploded perspective view of an electrical component cover fixing device in a conventional compressor, FIGS. 14 and 15 are perspective views of a conventional bracket, and FIGS. 16 and 17 are perspective views of a conventional electrical component cover. It is.

  In FIGS. 13 to 17, the sealed container 1 is formed by drawing a steel plate with a press, and an attachment plane portion 2 is provided for fixing the glass terminal 3. And the glass terminal 3 for supplying with electricity to an internal motor element (not shown) is adhering to the mounting plane part 2.

  The bracket 4 is formed by bending with a press of SPHC, which is a kind of hot-rolled mild steel material, and has a main body portion 4b provided with a relief hole 4a for the glass terminal 3, and two claw portions protruding inward. 5 includes a lower end surface portion 4c formed by bending 5 and an upper end surface portion 4d provided with attachment holes 6.

  As shown in FIG. 15, a plurality of welding projections 7 projecting in the direction of the mounting plane portion 2 of the sealed container 1 are formed on the main body portion 4 b.

  The electrical component 15 including the relay 13 and the motor protector 14 is attached to the glass terminal 3. The motor protector 14 detects the temperature of the sealed container 1 (indirectly detects the temperature of the electrical component), and when an abnormal temperature rise is detected, the motor protector 14 is energized to stop and control the electric component (not shown). Is used to prevent the compressor from being damaged.

  The resin electrical component cover 8 is provided with a locking hole 9 that engages with the claw portion 5 of the bracket 4 on the inner side of the lower end surface 8a, and on the upper surface of the snap base 10 on the inner side of the upper end surface 8b. A wedge-shaped snap 11 that engages with the attachment hole 6 is provided.

  The electrical component cover 8 is locked to the bracket 4 in order to protect the glass terminal 3 and the electrical component 15 from an external impact and prevent intrusion of water or the like, and is made of PPE (polyphenylene) of a synthetic resin material. It is injection-molded with a mixture of ether), PC (polycarbonate), PP (polypropylene), PBT (polybutylene terephthalate) and ABS (acrylonitrile butadiene styrene).

  The assembly procedure and operation of the electrical component cover fixing device for a compressor configured as described above will be described below.

  First, the glass terminal 3 is fixed to the mounting flat portion 2 of the sealed container 1 formed by drawing an iron plate with a press by resistance welding or the like.

  Next, the bracket 4 is disposed so that the escape hole 4a surrounds the glass terminal 3, and the plurality of welding projections 7 formed on the main body portion 4b are brought into contact with the mounting flat surface portion 2 of the sealed container 1, and in this state. The bracket 4 is fixed to the sealed container 1 by resistance welding the welding projection 7.

  Then, after the assembly is completed as a compressor, the relay 13 and the motor protector 14 in which wiring (not shown) is completed are mounted on the glass terminal 3.

  Then, the locking hole 9 of the electrical component cover 8 is inserted into the claw portion 5 of the bracket 4, and the electrical component cover 8 is inserted into the bracket 4 while rotating the electrical component cover 8 with the upper end of the claw portion 5 as a fulcrum. The snap 11 of the cover 8 is locked in the mounting hole 6 of the bracket 4, and the bracket 4 and the electrical component cover 8 are fixed.

Japanese Patent No. 3229730 Japanese Patent Laid-Open No. 10-318142

  The above-described conventional configuration is a configuration in which the bracket 4 is welded to the mounting plane portion 2 of the sealed container 1 by a plurality of welding projections 7 protruding in the direction of the mounting plane portion 2 of the sealed container 1. If the flatness of 2 is insufficient or the flatness of the main body portion 4b of the bracket 4 is insufficient, a minute gap is generated between the mounting flat portion 2 and the bracket 4 at a place other than the welded portion. There was a thing.

  Even when the flatness is sufficient, the bracket 4 may be thermally deformed due to thermal expansion during welding, which may generate a minute gap.

  When the minute gap is generated, the bracket 4 is not in contact with the mounting flat surface portion 2 in the vicinity thereof, so that the bracket 4 easily resonates due to the excitation force of the compressor operation. There was a problem that excessive noise would occur.

  In addition, the mounting flat part 2 of the closed container 1 is formed by drawing an iron plate with a press, but due to various factors such as the thickness of the iron plate and the sag of the press die, the flatness accuracy varies, Furthermore, since the thermal deformation of the bracket 4 during welding is not uniform, the minute gap is generated in an unstable manner, so that the bracket in the vicinity of the minute gap resonates irregularly and contributes to noise variation.

  Furthermore, in order to minimize the adverse effects on noise, it is necessary to demand high accuracy for the flatness of the mounting flat portion 2 of the sealed container 1 and the flatness of the main body portion 4b of the bracket 4. Had the problem of being bad.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide an electrical component cover fixing device for a compressor that suppresses resonance of a bracket, has low noise, and has high productivity.

In order to solve the above-mentioned conventional problems, the electrical equipment cover fixing device for a compressor according to the present invention is provided with at least one or more abutting portions that are in contact with other than the welded portion between the mounting plane portion and the bracket It is.

  Accordingly, the bracket can be reliably contacted and fixed by the contact portion, so that the resonance of the bracket can be suppressed.

  The electrical component cover fixing device for a compressor according to the present invention can reliably suppress the resonance of the bracket even when the flatness of the airtight container and the flatness of the main body of the bracket are insufficient. In addition, it is possible to provide an electrical component cover fixing device for a compressor with high productivity.

1 is an exploded perspective view of an electrical component cover fixing device for a compressor according to Embodiment 1 of the present invention. The perspective view from the front side of the bracket in Embodiment 1 The perspective view from the back side of the bracket in Embodiment 1 Sectional drawing of the principal part of the bracket in Embodiment 1 The perspective view from the outer surface side of the electrical component cover in the first embodiment The perspective view from the inner surface side of the electrical component cover in Embodiment 1 The exploded perspective view of the electrical equipment cover fixing device of the compressor in Embodiment 2 of this invention The perspective view of the airtight container in Embodiment 2 The perspective view from the front side of the bracket in Embodiment 2 Sectional drawing of the principal part of the airtight container in Embodiment 2 The perspective view from the outer surface side of the electrical component cover in Embodiment 2 The perspective view from the inner surface side of the electrical component cover in the second embodiment Exploded perspective view of a conventional compressor electrical component cover fixing device Perspective view from the front side of a conventional bracket Perspective view from the back side of a conventional bracket The perspective view from the outer surface side of the conventional electrical component cover The perspective view from the inner surface side of the conventional electrical component cover

  The invention according to claim 1 surrounds the airtight container, the mounting flat part provided in the airtight container, the glass terminal fixed to the mounting flat part, the electrical component cover covering the electrical components, and the glass terminal. And a bracket for holding the electrical component cover. The bracket includes a plurality of welding protrusions protruding toward the sealed container, and is welded between the mounting plane portion and the bracket. At least one or more abutting portions that are in contact with each other are provided.

  By adopting such a configuration, even when the flatness of the mounting flat portion or the main body portion of the bracket is insufficient, or when there is thermal deformation of the bracket due to welding, the mounting flat portion is reliably Since the bracket abuts, resonance of the bracket can be suppressed by contacting and fixing the bracket other than the welded portion. As a result, it is possible to provide an electrical component cover fixing device for a compressor with low noise and high productivity.

  According to a second aspect of the present invention, in the first aspect of the present invention, the contact portion is provided so that the distances from the two nearest welded portions are substantially equal.

That is, the resonance of the bracket tends to occur as the natural frequency decreases as the distance from the welded portion increases. However, by providing the contact portion at a position approximately the same distance away from the two closest welded portions, the resonance occurs. It is possible to effectively contact and fix an easy place at the contact portion. As a result, in addition to the effect of the first aspect of the invention, it is possible to provide an electrical component cover fixing device for a compressor that is more stable and low in noise.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the contact portion is constituted by a convex portion formed on the bracket.

  By adopting such a configuration, the convex portion can be formed simultaneously with the press molding of the bracket, and the contact portion can be provided at an arbitrary position. As a result, in addition to the effect of the first aspect of the invention, it is possible to provide an electrical component cover fixing device for a compressor with higher productivity and lower noise.

  According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the contact portion is constituted by a convex portion formed on a mounting flat portion of the sealed container.

  By adopting such a configuration, the contact portion can be provided at an arbitrary position, and can come into contact with the optimum position. In addition to the effects of the invention according to claim 1 or 2, further productivity is achieved. It is possible to provide an electrical component cover fixing device for a compressor that is high in noise and low in noise.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the convex portion formed on the mounting flat portion of the sealed container is formed by press molding in the vertical direction of the sealed container.

  By this, since the said convex part can be formed simultaneously at the time of drawing molding of an airtight container, the additional process which forms the said convex part becomes unnecessary. Therefore, in addition to the effect of the invention of the fourth aspect, it is possible to provide an electrical component cover fixing device for a compressor that is further inexpensive and has high productivity.

  The invention according to claim 6 is the invention according to any one of claims 3 to 5, wherein the step of the convex portion is made smaller than the step of the welding projection.

  Accordingly, it is possible to prevent occurrence of insufficient weld strength of the welded portion due to the projection coming into contact with the mounting flat surface portion during the bracket welding process. As a result, in addition to the effect of the invention according to any one of claims 3 to 5, it is possible to provide a highly reliable electrical component cover fixing device for a compressor with sufficiently ensured welding strength. .

  The invention according to claim 7 is the invention according to any one of claims 3 to 6, wherein the convex portion is formed in a curved surface shape.

  Accordingly, the convex portion can be formed into a shape that is easy to press-mold, and can be integrally formed simultaneously with the molding of the hermetic container or the bracket. Therefore, according to any one of claims 3 to 6. In addition to the effects of the invention, it is possible to provide an electrical component cover fixing device for a compressor that is further inexpensive and has high productivity.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
1 is an exploded perspective view of an electrical component cover fixing device for a compressor according to Embodiment 1 of the present invention, FIGS. 2 and 3 are perspective views from different directions of a bracket according to Embodiment 1, and FIG. FIG. 5 and FIG. 6 are perspective views from different directions of the electrical component cover according to the first embodiment.

  1 to 6, the sealed container 101 is formed by drawing an iron plate with a press, and is provided with a mounting flat portion 102 for fixing the glass terminal 103.

  The mounting flat portion 102 is formed by drawing an iron plate with a press, but has a shape with insufficient flatness due to various factors such as the thickness of the iron plate and the sag of the press die.

  The bracket 104 is formed by bending a steel plate, and a main body portion 104b provided with a relief hole 104a for the glass terminal 103, and a lower end surface portion 104c formed by bending the two claw portions 105 protruding inward. The upper end surface portion 104d provided with the attachment hole 106 is provided.

  A plurality of welding projections 107 projecting in the direction of the mounting flat surface portion 102 of the sealed container 101 are integrally formed on the main body portion 104b by press molding, and a plurality of convex portions 117 are formed in the same direction as the welding projection 107. It protrudes and is formed integrally with the bracket 104 by press molding.

  Each of the convex portions 117 is formed so that the distances from the two closest welded portions are substantially equal, and has a substantially SR shape (curved surface) as shown in FIG. The step B from the step is smaller than the step A of the welding projection 107.

  The resin electrical component cover 108 is provided with a locking hole 109 that engages with the pawl 105 of the bracket 104 inside the lower end surface 108a, and a snap base 110 inside the upper end surface 108b. A wedge-shaped snap 111 that engages with the attachment hole 106 is provided on the upper surface of the snap base 110.

  An electrical component 115 including a relay 113 and a motor protector 114 is attached to the glass terminal 103.

  The assembly procedure and operation of the electrical component cover fixing device for a compressor configured as described above will be described below.

  First, the glass terminal 103 is fixed to the mounting flat portion 102 of the sealed container 101 formed by drawing an iron plate with a press by resistance welding or the like.

  Next, the bracket 104 is arranged so that the escape hole 104a provided in the bracket 104 surrounds the glass terminal 103, and in this state, a plurality of welding projections 107 formed on the main body portion 104b and projecting toward the sealed container 101 are provided. Are in contact with the mounting flat surface portion 102 of the sealed container 101. The bracket 104 is welded to the sealed container 101 by resistance welding the welding projection 107.

  After resistance welding, the projecting portion 117 formed on the bracket 104 abuts against the mounting flat surface portion 102 to form a contact portion 116, and the bracket 104 is contact-fixed at a location other than the welded portion by the contact portion 116.

  After that, after the assembly is completed as a compressor, the relay 113 and the motor protector 114 with the wiring (not shown) completed are attached to the glass terminal 103.

  Then, by inserting the claw portion 105 of the bracket 104 toward the bracket 104 while rotating the electrical component cover 108, the snap 111 of the electrical component cover 108 is locked to the mounting hole 106 of the bracket 104, The electrical component cover 108 is fixed.

  In the above-described assembly, when the bracket 104 is welded to the mounting flat surface portion 102, the bracket even if the flatness of the mounting flat surface portion 102 is insufficient or the flatness of the main body portion 104b of the bracket 104 is insufficient. By projecting the plurality of convex portions 117 formed on 104 to the sealed container 101 side, the convex portion 117 is surely brought into contact with the mounting flat surface portion 102, and the bracket 104 is contact-fixed by intentionally providing the contact portion 116. be able to.

  Therefore, since the contact portion 116 contacts and fixes a minute gap between the mounting flat surface portion 102 and the bracket 104 generated by a defect in flatness or thermal deformation of the bracket 104 during welding, the compressor is operated. Resonance can be suppressed, and compressor noise can be reduced.

  The resonance of the bracket 104 is likely to occur near the center of the welded portions because the natural frequency tends to decrease as the distance from the welded portion increases, but the contact portion 116 has a distance from the two welded portions. By providing the positions so as to be approximately equal, the portions that are likely to resonate are intentionally brought into contact with each other and fixed in contact with each other, so that the probability of occurrence of resonance can be greatly reduced.

  Furthermore, the level difference B of the convex part 117 is slightly protruded from the main body part 104b of the bracket 104, and is smaller than the level difference A of the welding projection 107, so that current flows to the convex part 117 during resistance welding. Therefore, the bracket 104 can be welded with a small current, and productivity can be improved.

  Moreover, since the convex part 117 contacts the attachment flat part 102 and the welding projection 107 is not sufficiently melted, it is possible to prevent the shunt from flowing into the convex part 117, so that the current that should flow through the welding projection 107 is reduced. It is possible to prevent the problem of insufficient welding strength due to the above.

  In the first embodiment, the contact portion 116 is configured by the convex portion 117 formed on the bracket 104. However, depending on the shape of the mounting flat portion 102 of the sealed container 101 or the main body portion 104b of the bracket 104, the concave portion 116 It goes without saying that the same effect can be obtained even if configured.

  In the first embodiment, the number of the welding projections 107 is three, but it goes without saying that the same effect can be obtained even if three or more are formed depending on the required welding strength and shape.

  Furthermore, although the electrical component cover fixing device for a compressor in which the electrical component cover 108 is inserted with one touch has been described as an example, the electrical component cover fixing device for a compressor that does not easily come off and does not cause an electrical accident. For example, even if it is not a thing of one-touch insertion, it can implement similarly.

(Embodiment 2)
7 is an exploded perspective view of an electrical component cover fixing device for a compressor according to Embodiment 2 of the present invention, FIG. 8 is a perspective view of an airtight container according to Embodiment 2, and FIG. 9 is Embodiment 2. FIG. 10 is a cross-sectional view of the main part of the sealed container according to the second embodiment, and FIGS. 11 and 12 are perspective views from different directions of the electrical component cover according to the second embodiment.

7 to 12, the sealed container 201 is formed by drawing an iron plate with a press, and is provided with a mounting flat portion 202 for fixing the glass terminal 203.

  The mounting flat part 202 is a convex part that protrudes to the bracket 204 side, leaving a minimum necessary flat part so as not to generate a gap between the glass terminal 203 and the glass terminal 203 after fixing. 217 is integrally formed.

  The convex portion 217 is integrally formed by press molding in the vertical direction of the sealed container 201, and is formed so that the distance from the two nearest welded portions is substantially equal after the bracket 204 is welded. Yes.

  Further, as shown in FIG. 10, the convex portion 217 has a substantially R shape (curved surface), and the step D from the mounting plane portion 202 is smaller than the step of the welding projection 207.

  The bracket 204 is formed by bending a steel plate, and includes a main body portion 204b provided with a relief hole 204a for the glass terminal 203, and a lower end surface portion 204c formed by bending the two claw portions 205 protruding inward. And an upper end surface portion 204d provided with a mounting hole 206.

  A plurality of welding projections 207 projecting in the direction of the mounting flat portion 202 of the sealed container 201 are integrally formed on the main body portion 204b by press molding.

  The resin electrical component cover 208 is provided with a locking hole 209 that engages with the claw portion 205 of the bracket 204 inside the lower end surface 208a, and a snap base 210 inside the upper end surface 208b. A wedge-shaped snap 211 that engages with the attachment hole 206 is provided on the upper surface of the snap base 210.

  An electrical component 215 including the relay 213 and the motor protector 214 is attached to the glass terminal 203.

  The assembly procedure and operation of the electrical component cover fixing device for a compressor configured as described above will be described below.

  First, the glass terminal 203 is fixed to a mounting flat portion 202 of the sealed container 201 formed by drawing an iron plate with a press by resistance welding or the like.

  Next, the bracket 204 is disposed so that the escape hole 204a provided in the bracket 204 surrounds the glass terminal 203, and in this state, a plurality of welding projections 207 formed on the main body portion 204b and projecting toward the sealed container 201 side. Is brought into contact with the mounting flat portion 202 of the sealed container 201. The bracket 204 is welded to the sealed container 201 by resistance welding the welding protrusion 207.

  After resistance welding, the projecting portion 217 formed on the mounting plane portion 202 of the sealed container 201 is in contact with the main body portion 204b of the bracket 204 to form a contact portion 216. The contact portion 216 allows the bracket 204 to be other than the welded portion. The contact is fixed at the point.

  Then, after the assembly is completed as a compressor, the relay 213 and the motor protector 214 that have been completely wired (not shown) are mounted on the glass terminal 203.

Then, by inserting the claw portion 205 of the bracket 204 toward the bracket 204 while rotating the electrical component cover 208, the snap 211 of the electrical component cover 208 is locked to the mounting hole 206 of the bracket 204, and the bracket 204 The electrical component cover 208 is fixed.

  In the above-described assembly, when the bracket 204 is welded to the mounting flat portion 202, the bracket 204 is sealed even when the flatness of the mounting flat portion 202 is insufficient or the flatness of the main body portion 204 b of the bracket 204 is insufficient. By projecting the convex portion 217 formed on the container 201 to the bracket 204 side, the convex portion 217 is surely brought into contact with the main body portion 204b of the bracket 204, and the bracket 204 is contact-fixed by intentionally providing the contact portion 216. be able to.

  Accordingly, since the contact portion 216 contacts and fixes a minute gap between the mounting plane portion 202 and the bracket 204 generated by a defect in flatness or thermal deformation of the bracket 204 during welding, the compressor is operated. Resonance can be suppressed, and compressor noise can be reduced.

  Further, the resonance of the bracket 204 tends to occur near the center of the welded portions because the natural frequency tends to decrease as the distance from the welded portion increases, but the contact portion 216 has a distance from the two welded portions. By providing the positions so as to be approximately equal, the portions that are likely to resonate are intentionally brought into contact with each other and fixed in contact with each other, so that the probability of occurrence of resonance can be greatly reduced.

  Furthermore, the level difference D of the convex part 217 is set so as to slightly protrude from the mounting flat part 202 of the sealed container 201, and is smaller than the level difference of the welding projection 207 of the bracket 204, so that the resistance part is moved to the convex part 217 during resistance welding. Since no current flows, the bracket 204 can be welded with a small current, so that productivity can be improved.

  Further, since the projecting portion 217 contacts the bracket 204 and the welding projection 207 is not sufficiently melted, it is possible to prevent the shunt from flowing into the projecting portion 217, resulting in a decrease in current that should flow through the welding projection 207. It is possible to prevent problems such as insufficient welding strength.

  In the second embodiment, the contact portion 216 is configured by the convex portion 217 formed on the mounting flat portion 202 of the sealed container 201. However, the mounting flat portion 202 of the sealed container 201 and the main body portion 204b of the bracket 204 are not provided. It goes without saying that the same effect can be obtained even if it is constituted by a recess depending on the shape and the like.

  In the second embodiment, the number of the welding projections 207 is three, but it goes without saying that the same effect can be obtained even if three or more are formed depending on the required welding strength and shape.

  Further, although the electrical component cover fixing device for the compressor in which the electrical component cover 208 is inserted with one touch has been described as an example, the electrical component cover fixing device for the compressor that does not easily come off and does not cause an electrical accident. For example, even if it is not a thing of one-touch insertion, it can implement similarly.

  As described above, the electrical component cover fixing device for a compressor according to the present invention can reduce noise by contacting and fixing the bracket and the mounting flat portion at a contact portion other than the welded portion, and can also improve the productivity of the sealed container and the bracket. Therefore, it can be applied to an electrical equipment cover fixing device of any compressor such as a refrigerator, an air conditioner, and a freezer / refrigerator.

101, 201 Airtight container 102, 202 Mounting flat part 103, 203 Glass terminal 104, 204 Bracket 107, 207 Welding protrusion 108, 208 Electrical component cover 115, 215 Electrical component 116, 216 Peripheral part 117, 217 Convex part

Claims (7)

An airtight container, an attachment flat portion provided in the airtight container, a glass terminal fixed to the attachment flat portion, an electric component cover covering the electric component, and being fixed so as to surround the glass terminal, and the electric component cover A bracket that holds a plurality of weld protrusions protruding toward the sealed container, and at least a contact portion that is in contact with other than the weld portion between the mounting flat surface portion and the bracket. An electrical equipment cover fixing device for a compressor provided at one or more locations. The electrical component cover fixing device for a compressor according to claim 1, wherein the contact portion is provided at a position where the distances from the two nearest welded portions are substantially equal. The electrical component cover fixing device for a compressor according to claim 1, wherein the contact portion is constituted by a convex portion formed on the bracket. The electrical component cover fixing device for a compressor according to claim 1, wherein the contact portion is configured by a convex portion formed on a mounting flat portion of the sealed container. The electrical component cover fixing device for a compressor according to claim 4, wherein a convex portion formed on a mounting flat portion of the sealed container is formed by press molding in a vertical direction of the sealed container. The electrical component cover fixing device for a compressor according to any one of claims 3 to 5, wherein the step of the convex portion is made smaller than the step of the welding projection. The electrical component cover fixing device for a compressor according to any one of claims 3 to 6, wherein the convex portion is formed in a curved shape.