JPH0626574A - Sealing device of refrigerant compressor - Google Patents

Abstract

PURPOSE:To promote an improvement in working properties as a counter measure against a packing cut to be produced by an icing phenomenon as well as avoid gas leakage without fail, in a bolt clamp packing part of a refrigerant compressor. CONSTITUTION:Each seal ring 6 is interposed between a bolt bearing surface and each clamping bolt 3 of a motor cover 2, thereby preventing water ingression. Therefore any possible penetration of water from entering a bolt hole part of packing, while the conventional sealant applying work is dispensable, thus any gas leakage due to packing breakdown is surely preventable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas leakage prevention measure for a refrigerant compressor.

[0002]

2. Description of the Related Art FIG. 10 is a sectional view a showing a gas leakage prevention structure of a refrigerant compressor of this type and a plan view b of packing used therein, in which 1 is a compressor element and an electric motor not shown. Crank case for storing elements, 2
Has a suction port 2a and a bolt hole 2b in the surrounding collar portion,
The motor cover 4 is attached to the end face of the crankcase 1 through the bolt 3 in the bolt hole 2b and the bolt hole 4b surrounds the bolt hole 4b.
A packing 5 which has a and is interposed between the crankcase 1 and the motor cover 2 to prevent gas leakage prevents moisture from entering from the contact surface between the bolt seat surface of the motor cover 2 and the bolt 3. This is a sealant applied for that purpose.

Next, the operation will be described. When the temperature of the low-temperature refrigerant gas sucked through the suction port 2a of the motor cover 2 decreases, the temperature of the outer surface of the motor cover 2 becomes lower than the dew point temperature, the moisture in the outside air is condensed, and the outer surface of the motor cover 2 is removed. Dew. Further, moisture invades from the contact surface between the bolt seat surface of the motor cover 2 and the head of the bolt 3, so that the space between the bolt hole 2b of the motor cover 2 and the bolt hole 4a of the packing 4 is also filled with water. Then, when the temperature of the low-temperature refrigerant gas further decreases, the moisture on the outer surface of the motor cover 2 and the bolt holes 2b and 4a freezes and expands, and when the temperature of the low-temperature refrigerant gas rises, the ice melts. By repeating these steps, the bolt hole 4a portion of the packing 4 may be deformed or damaged and there is a risk of gas leakage. Therefore, in order to avoid this danger, the sealing agent 5 is applied to the contact outer peripheral portion between the head of the bolt 3 and the motor cover 2.

[0004]

Since the gas leakage prevention portion of the conventional refrigerant compressor is constructed as described above, it takes a long time to apply the sealant, and the motor cover is disassembled and reassembled. Sometimes it is necessary to remove and clean the sealant.If cleaning is not sufficient at this time, water will enter and gas leakage due to damage to the packing will occur, and the sealant will be exposed on the surface of the motor cover, resulting in a good appearance. There was a problem such as no.

The present invention has been made in order to solve the above-mentioned problems, and the work of applying and removing the sealant can be eliminated, and the gas leakage due to the damage of the packing can be surely avoided, and the appearance is excellent. It is an object of the present invention to provide a refrigerant compressor that can improve even better.

[0006]

According to a first aspect of the present invention, a refrigerant compressor has a seal ring attached to each bolt seat surface.

A refrigerant compressor according to a second aspect of the present invention is such that one seal ring, which is common to all bolt holes, is attached to each bolt seat surface.

In the refrigerant compressor according to a third aspect of the present invention, an O ring groove is provided at the bolt hole inlet of the motor cover, and an O ring is attached between the bolt hole of the motor cover and the bolt.

In the refrigerant compressor according to the fourth aspect, an O-ring groove is provided on the seat surface of the bolt, and the O-ring is attached between the bolt hole of the motor cover and the bolt.

In the refrigerant compressor according to a fifth aspect of the present invention, a sealant is filled between the bolt holes of the motor cover and the bolts inserted into the bolt holes.

A refrigerant compressor according to a sixth aspect of the present invention is provided with a ring-shaped drainage groove which passes through each bolt seat surface of the motor cover.

A refrigerant compressor according to a seventh aspect of the present invention is provided with a water draining hole which communicates with the outside from the bolt hole of the motor cover in the outer peripheral direction.

In the refrigerant compressor according to the eighth aspect, a drainage groove is provided in the seat surface portion of the bolt head.

In the refrigerant compressor according to a ninth aspect, an electric heater is attached to the outer peripheral portion of the motor cover bolt hole.

[0015]

According to the first aspect of the present invention, by mounting the seal ring on each bolt seat surface of the noether cover of the refrigerant compressor, it is possible to prevent water from entering the bolt holes of the refrigerant compressor. No water will be accumulated, and the work of applying a sealant on the bolt head and the work of cleaning can be eliminated, and gas leakage due to damage to the packing can be avoided.

According to the second aspect of the present invention, by mounting an integrated sheet packing common to all the bolt holes on each bolt seat surface of the motor cover of the refrigerant compressor, moisture in the bolt holes of the refrigerant compressor can be prevented. Invasion can be prevented, water does not collect in this portion, and the work of applying the sealant and cleaning of the bolt head can be eliminated, and gas leakage due to damage to the packing can be avoided.

According to the third aspect of the present invention, an O-ring groove is provided at the inlet of the bolt hole of the motor cover of the refrigerant compressor, and an O-ring is attached between the bolt hole of the motor cover and the bolt. It is possible to prevent water from entering the bolt holes of the machine, to prevent water from accumulating in this portion, to eliminate the work of applying a sealant and cleaning the bolt head, and to avoid gas leakage due to packing damage.

According to the fourth aspect of the present invention, the O-ring groove is provided on the seat surface of the bolt of the refrigerant compressor, and the O-ring is mounted between the motor cover and the bolt, so that the water content in the bolt hole of the refrigerant compressor is increased. Can be prevented, water can not be accumulated in this portion, the work of applying a sealant on the bolt head and the work of cleaning can be eliminated, and gas leakage due to damage to the packing can be avoided.

According to the fifth aspect of the present invention, by filling a sealant in the bolt hole space of the refrigerant compressor and the bolt hole of the motor cover, it is possible to prevent water from entering the bolt hole of the refrigerant compressor. It is possible to prevent water from being accumulated in the cylinder, eliminate the work of applying the sealant on the bolt head and the work of cleaning, and avoid gas leakage due to damage to the packing.

According to the sixth aspect of the present invention, the motor cover of the refrigerant compressor is provided with the water drain groove passing through the bolt hole seating surface, so that even if water is frozen in the bolt hole of the compressor, the volume at the time of freezing is increased. Since all the expanded portion escapes from the water drain hole to the outside, the force due to freezing does not act on the packing. Therefore, it is possible to prevent the packing from breaking, which can eliminate the work of applying the sealant and the work of cleaning the bolt head.

According to a seventh aspect of the present invention, by providing a through hole that extends from the bolt hole of the motor cover of the refrigerant compressor to the outer peripheral direction, even when water is frozen in the bolt hole of the compressor, the volume at the time of freezing is increased. Since all the expanded portion escapes from the water drain hole to the outside, the force due to freezing does not act on the packing. Therefore, since the packing can be prevented from being broken, the work for applying the sealant and the work for cleaning the bolt head can be eliminated.

According to the eighth aspect of the present invention, by providing the water drain groove in the motor cover fastening bolt of the refrigerant compressor, even if water is frozen in the bolt hole of the compressor, the volume expansion at the time of freezing occurs. Since all the parts escape to the outside from the drain hole, the force due to freezing does not act on the packing. Therefore,
By avoiding packing breakage, the work of applying sealant and cleaning the bolt head can be eliminated.

According to the ninth aspect of the present invention, by mounting the electric heater on the outer peripheral portion of the bolt hole of the motor cover, the bolt hole space is heated by this heater and icing can be prevented. Therefore, the breakage of the packing can be avoided, so that the sealing agent applying work and the cleaning work of the bolt head can be eliminated.

[0024]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. 1a and 1b are a sectional view a of a main part of a refrigerant compressor according to a first embodiment of the present invention and a plan view b of a seal ring thereof.
In the figure, 6 is a seal ring provided on the seating surface of each bolt 3, and the sealant 5 of the conventional example is omitted. Since the other configurations are the same as the conventional example,
The description is omitted.

Next, the operation will be described. Moisture generated as a result of dew condensation and frost formation on the outer surface of the motor cover 2 tries to enter from the seating surfaces of the motor cover 2 and the bolts 3, but the seal ring 6 is provided on each of the seating surfaces of the plurality of bolts 3. Water is prevented from entering the bolt hole 2a and the bolt hole 4a of the packing 4 because of the interposition. Therefore,
The deformation or damage of the bolt hole 4a of the packing 4 due to repeated freezing and melting of water can be prevented, and the risk of gas leakage is eliminated.

Example 2. 2 is a sectional view a of a main part of a refrigerant compressor according to a second embodiment of the present invention and a plan view b of a seat packing thereof. In this embodiment, a sheet packing 7 is used in place of the seal ring in the first embodiment. Since the sheet packing 7 is a single sheet and has a plurality of bolt holes 7a, the sheet packing 7 itself is Attachment and removal are extremely easy, and the same effect as that of the first embodiment can be obtained.

Example 3. FIG. 3 is a sectional view a of a main part of a refrigerant compressor according to a third embodiment of the present invention and a plan view b of an O-ring thereof. In the figure, 8 is an O-ring and 9 is a motor cover. An O-ring groove 9a is provided at the entrance of each bolt hole 9b of the motor cover 9, and the O-ring 8 is inserted into this and tightened with the bolt 3. The water generated as a result of dew condensation and frost formation on the outer surface of the motor cover 9 does not enter the bolt holes 9b and the bolt holes 4a of the packing 4, and the water freezes and melts repeatedly. The bolt hole 4a of the packing 4 can be prevented from being deformed or damaged due to, and the risk of gas leakage is eliminated.

Example 4. FIG. 4 is a cross-sectional view a of a main part of a refrigerant compressor according to a fourth embodiment of the present invention and a side view b of the bolt thereof as seen from the seating surface side. In the figure, 10 is a bolt, 10a is an O-ring groove formed on the seating surface of the bolt 10, and 11 is an O-ring inserted in this groove. That is,
Crank case 1 with motor cover 2 through packing 4
By providing the O-ring groove 10a in the bolt 10 for tightening the bolt and mounting the O-ring 11 in the groove 10a, the same effect as that of the third embodiment can be obtained. In the case of the present embodiment, it is extremely easy to construct the O-ring groove 10a in the bolt 10, so the bolt 10 can be manufactured at low cost.

Example 5. FIG. 5 is a sectional view of essential parts of a refrigerant compressor according to Embodiment 5 of the present invention. In the figure, 12
Is, for example, a sealing agent such as grease or a sealant. When the motor cover 2 is fastened to the crankcase 1 with the plurality of bolts 3 via the packing 4, the sealing agent is filled in the plurality of bolt holes 2b of the motor cover 2. To be done. By doing so, the plurality of bolt holes 2b of the motor cover 2 are
The space between the bolt 3 and the bolt 3 is completely filled with the sealant, and the water generated as a result of the dew condensation and frost formation on the outer surface of the motor cover 2 does not enter the bolt hole 2b and the bolt hole 4a of the packing 4 and the It is possible to prevent deformation or damage of the bolt hole 4a of the packing 4 due to repeated freezing and thawing, and to eliminate the risk of gas leakage. Further, since the sealant 12 is completely filled in the bolt holes, it does not protrude to the outside and has a good appearance.

Example 6. 6 is a side view a and a sectional view taken along the line AA of a refrigerant compressor according to a sixth embodiment of the present invention. In the figure, 13 is a motor cover, 13a is installed on the seating surface of the bolt 3 of this motor cover 13,
It is a ring-shaped drainage groove connected to the bolt hole 13b. As described above, by constructing the drainage groove 13a on the seating surface of the bolt 3 of the motor cover 13, the moisture generated as a result of dew condensation and frost formation on the outer surface of the motor cover 13 causes the bolt hole 13b and the packing to be sealed. 4 into the bolt hole 4a of the motor 4 and icing there, the bolt hole 4a of the packing 4 and the bolt hole 13b of the motor cover 13 still have the water drain groove 13a.
Since it is connected to the outside through the water, all the volume expansion of the water during freezing escapes to the outside through the drainage groove, so no force acts on the bolt hole 4a of the packing 4 when the water freezes. The bolt hole 4a of the packing 4 can be prevented from being deformed or damaged, and the risk of gas leakage is eliminated.

Example 7. 7 is a side view a and a BB sectional view b of a refrigerant compressor according to a seventh embodiment of the present invention. In the figure, 14 is a motor cover, 14c is a plurality of bolt holes, 14a is a drain hole formed in the bolt hole 14c from the outer periphery of the motor cover 14, and 14b is water connecting the plurality of bolt holes 14c with the outer periphery of the motor cover 14. It is a cutout groove. As described above, since the plurality of bolt holes 14c of the motor cover 14 are connected to the outside through the water draining holes 14a and the water draining grooves 14b formed from the outer periphery of the motor cover 14, the same effect as the sixth embodiment is obtained. Is obtained.

Example 8. FIG. 8 is a sectional view a of a main part of a refrigerant compressor according to an eighth embodiment of the present invention and a side view b of the bolt of the refrigerant compressor as seen from the seating surface side. In the figure, 15 is a bolt, and 15a is a drainage groove provided on the seating surface of the bolt 15, and this drainage groove 15a is provided so as to be connected to the bolt hole 2b of the motor cover 2. The hole 4a and the bolt hole 2b of the motor cover 2 are connected to the outside via a drainage groove 15a provided on the seating surface of the bolt 15. Therefore, the water generated as a result of the dew condensation and frost formation on the outer surface of the motor cover is prevented from being absorbed by the bolt holes 4 of the packing 4.
Even if it penetrates into the bolt hole 2b of the motor cover 2 and freezes, the same effect as that of the sixth embodiment can be obtained.

Example 9. FIG. 9 is a cross-sectional view a of a main part of a refrigerant compressor according to a ninth embodiment of the present invention and a plan view b of an electric heater therein. In the figure, 16 is an electric heater, which is attached to the entire outer circumference of the motor cover 2.
By heating by energization, even if water generated as a result of dew condensation and frost formation on the outer surface of the motor cover 2 enters the bolt holes 2b of the motor cover 2 and the bolt holes 4a of the packing 4, it does not freeze. I have to. Therefore, the bolt hole 4a of the packing 4 does not act at all, the bolt hole 4a of the packing 4 is not deformed or damaged, and there is no risk of gas leakage.

[0034]

As described above, according to the present invention, the packing is prevented from being damaged due to freezing of water with a simple structure, and the sealant application work and the cleaning work of the bolt head can be omitted. In addition, it has excellent effects such as not affecting the appearance.

[Brief description of drawings]

FIG. 1 is a cross-sectional view a of a main part of a refrigerant compressor according to a first embodiment of the present invention and a plan view b of a seal ring thereof.

FIG. 2 is a sectional view (a) of a main part of a refrigerant compressor according to a second embodiment of the present invention and a plan view (b) of a seat packing therein.

FIG. 3 is a sectional view a of a main part of a refrigerant compressor according to a third embodiment of the present invention and a plan view b of an O-ring thereof.

FIG. 4 is a sectional view (a) of a main part of a refrigerant compressor according to a fourth embodiment of the present invention and a side view (b) of the bolt thereof as seen from the seating surface side.
Is.

FIG. 5 is a sectional view of essential parts of a refrigerant compressor according to a fifth embodiment of the present invention.

FIG. 6 is a side view a and a sectional view taken along line AA of a refrigerant compressor according to a sixth embodiment of the present invention.

FIG. 7 is a side view a and a BB sectional view b of a refrigerant compressor according to a seventh embodiment of the present invention.

FIG. 8 is a sectional view (a) of a main part of a refrigerant compressor according to an eighth embodiment of the present invention and a side view (b) of the bolt of the refrigerant compressor as viewed from the seating surface of the seat.
Is.

FIG. 9 is a sectional view (a) of a main part of a refrigerant compressor according to a ninth embodiment of the present invention and a plan view (b) of an electric heater therein.

FIG. 10 is a sectional view (a) of a main part of a conventional refrigerant compressor on a suction side, and a plan view (b) of a packing attached between the crankcase and the motor frame.

[Explanation of symbols]

 1 Crankcase 2 Motor cover 2a Suction port 2b Bolt hole 3 Bolt 4 Packing 4a Bolt hole 6 Seal ring 7 Sheet packing 8 O-ring 9 Motor cover 9a O-ring groove 9b Bolt hole 10 Bolt 10a O-ring groove 11 O-ring 12 Sealant 13 motor cover 13a drainage groove 13b bolt hole 14 motor cover 14a drainage hole 14b drainage groove 14c bolt hole 15 bolt 15a drainage groove 16 electric heater

Claims (9)

[Claims] 1. A crankcase for accommodating an electric motor element and a compressor element, a motor cover attached to an end surface of the crankcase via a bolt, and a bolt hole in a connecting portion interposed between the motor cover and the crankcase. In a refrigerant compressor provided with a ring-shaped gas leakage prevention packing having a seal, a separate seal ring is attached to each of the bolt seat surfaces. 2. A crankcase for accommodating an electric motor element and a compressor element, a motor cover attached to an end surface of the crankcase via a bolt, and a bolt hole provided at a connecting portion between the motor cover and the crankcase. In a refrigerant compressor having a ring-shaped gas leakage prevention packing having, a refrigerant compressor characterized in that an integrated seat packing is attached to each of the bolt seat surfaces and is common to all bolt holes. Sealing device. 3. A crankcase for accommodating an electric motor element and a compressor element, a motor cover attached to an end surface of the crankcase via a bolt, and a bolt hole in a connecting portion interposed between the motor cover and the crankcase. In a refrigerant compressor having a ring-shaped gas leakage prevention packing having an O-ring groove at the inlet of the bolt hole of the motor cover, an O-ring is attached between the bolt hole of the motor cover and the bolt. A seal device for a refrigerant compressor, characterized by: 4. A crankcase for accommodating an electric motor element and a compressor element, a motor cover attached to an end surface of the crankcase via a bolt, and a bolt hole in a connecting portion interposed between the motor cover and the crankcase. In a refrigerant compressor provided with a ring-shaped gas leakage prevention packing having an O-ring groove on the bolt seat surface, and inserting the O-ring into this groove, the O-ring is mounted between the motor cover and the bolt. A seal device for a refrigerant compressor, which is characterized in that 5. A crankcase for accommodating an electric motor element and a compressor element, a motor cover attached to an end face of the crankcase via a bolt, and a bolt hole in a connecting portion interposed between the motor cover and the crankcase. In a refrigerant compressor having a ring-shaped gas leakage prevention packing having a sealant, a space between the bolt hole of the motor cover and the bolt inserted into the bolt hole is filled with a sealant. Sealing device. 6. A crankcase for accommodating an electric motor element and a compressor element, a motor cover attached to an end face of the crankcase via a bolt, and a bolt hole in a connecting portion interposed between the motor cover and the crankcase. A refrigerant compressor provided with a ring-shaped gas leakage prevention packing having the above-mentioned, wherein a common ring-shaped drain groove passing through each bolt seat surface of the motor cover is provided. 7. A crankcase for accommodating an electric motor element and a compressor element, a motor cover attached to an end face of the crankcase via a bolt, and a bolt hole in a connecting portion interposed between the motor cover and the crankcase. In a refrigerant compressor provided with a ring-shaped gas leakage prevention packing having the above-mentioned, a sealing device for a refrigerant compressor, characterized in that a water drain hole communicating from the respective bolt holes of the motor cover to the outer peripheral direction is provided. 8. A crankcase for accommodating an electric motor element and a compressor element, a motor cover attached to an end face of the crankcase via a bolt, and a bolt hole in a connecting portion interposed between the motor cover and the crankcase. In a refrigerant compressor having a ring-shaped gas leakage prevention packing having, a water drain groove communicating with a bolt hole of a motor cover into which the bolt is inserted is provided on a seating surface of the bolt head. Sealing device for refrigerant compressor. 9. A crankcase for accommodating an electric motor element and a compressor element, a motor cover attached to an end surface of the crankcase via a bolt, and a bolt hole in a connecting portion interposed between the motor cover and the crankcase. A refrigerant compressor provided with a ring-shaped gas leakage prevention packing having: a belt-shaped electric heater wound around an outer peripheral portion of the bolt hole of the motor cover.