Sealing pin specific to the compressor device and compressor device

Abstract

This utility model relates to a sealing plug specifically for compressor units and a compressor unit, enabling the insertion of the sealing plug and ensuring its airtightness. The sealing plug for compressor units seals an opening at one end of a connecting pipe used to connect a compressor unit, which is part of a refrigeration cycle mechanism, to other devices constituting the refrigeration cycle mechanism. The sealing plug has: a main body portion that seals the opening at one end of the connecting pipe when the sealing plug is installed in the connecting pipe; and a hole portion formed along the length of the sealing plug, extending from one end face to the middle. The main body portion has: a large-diameter portion located at the base end of the main body portion; and a small-diameter portion located at a position closer to the front end of the sealing plug than the large-diameter portion, formed with an outer diameter smaller than the outer diameter of the large-diameter portion. The diameter of the hole portion is set such that it is smaller at the front end side opposite to the base end side compared to the base end side of one end face of the sealing plug, and the front end of the hole portion is located within the region of the small-diameter portion in the length direction.

Description

Technical Field

[0001] The embodiments of this utility model relate to a sealing bolt for compressor devices and a compressor device. Background Technology

[0002] Traditionally, refrigerant, as the working fluid, is supplied from the evaporator through the receiver and from the suction pipe to the compressor, which forms part of the refrigeration cycle of a refrigeration device or air conditioner. The refrigerant, compressed to a high temperature and pressure by the compressor, is then supplied to the condenser from the discharge pipe. During the manufacture of the refrigeration cycle, to prevent external air from entering the compressor, a sealing plug is inserted into the discharge pipe to maintain an airtight seal within the compressor.

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2005-016478 The problem to be solved by the utility model However, when inserting the sealing plug into the refrigerant discharge pipe, a special clamp is pressed into the hole formed in the sealing plug to ensure a tight fit between the sealing plug and the inner circumferential surface of the refrigerant discharge pipe. The hole formed in the sealing plug extends halfway along the length of the sealing plug. If the clamp is pressed into the hole with the central axis of the hole offset from the central axis of the shaft, the front end of the sealing plug may bend while being inserted into the refrigerant discharge pipe. In this case, workability related to the insertion of the sealing plug may deteriorate, and the tightness between the sealing plug and the refrigerant discharge pipe cannot be adequately ensured. Utility Model Content

[0004] This utility model provides a sealing plug and compressor device specifically designed for compressor devices that ensure the workability of the sealing plug during insertion and the airtightness of the sealing plug.

[0005] The compressor-specific sealing plug according to the embodiment is capable of sealing an opening at one end of a connecting pipe used to connect a compressor unit constituting part of a refrigeration cycle mechanism to other devices constituting the refrigeration cycle mechanism. The sealing plug is characterized by having: a sealing plug body portion that seals the opening at one end of the connecting pipe when the sealing plug is installed in the connecting pipe; and a hole portion formed along the length direction of the sealing plug, extending from one end face of the sealing plug to the middle. The sealing plug body portion has: a large-diameter portion located at the base end side of the sealing plug body portion; and a small-diameter portion located at a position closer to the front end side of the sealing plug than the large-diameter portion, formed with an outer diameter smaller than the outer diameter of the large-diameter portion. The diameter of the hole portion is set to be smaller at the front end side opposite to the base end side compared to the base end side of one end face of the sealing plug, and the front end of the hole portion is located within the region of the small-diameter portion in the length direction.

[0006] The sealing plug for the compressor device involved in the embodiment may also be configured such that, in the region of the small diameter portion, the distance from the front end of the hole to the front end of the small diameter portion is set to be greater than or equal to the minimum distance from the hole to the outer peripheral surface of the sealing plug body.

[0007] The sealing plug for the compressor device involved in the embodiment may also be configured such that the minimum distance from the hole to the outer peripheral surface of the sealing plug body in the region of the small diameter portion is set to be greater than the minimum distance from the hole to the outer peripheral surface of the sealing plug body in the region of the large diameter portion.

[0008] The sealing bolt for the compressor device involved in the embodiment may also be configured such that the distance from the front end of the hole to the front end of the small diameter portion is set to be greater than the length of the hole in the region of the small diameter portion.

[0009] The sealing bolt for the compressor device involved in the embodiment can also be configured such that the hole is formed in a stepped structure by a large-diameter portion of the hole on the base end side and a small-diameter portion of the hole on the front end side.

[0010] The sealing plug for the compressor device involved in the embodiment may also be configured such that the main body of the sealing plug further has an inclined portion formed between the large diameter portion and the small diameter portion, and gradually narrows from the base end side of the main body of the sealing plug toward the front end side, and the hole portion further has an inclined portion formed between the large diameter portion and the small diameter portion of the hole portion, and gradually narrows from the base end side of the hole portion toward the front end side, and the inclined portion is located in the region of the inclined portion of the hole portion in the length direction.

[0011] The sealing plug for the compressor device involved in the embodiment may also be configured such that the diameter of the hole gradually decreases from the base end side toward the front end side.

[0012] The sealing plug for the compressor unit involved in the embodiments may also be configured such that the sealing plug is formed of EPDM rubber.

[0013] The compressor unit involved in the embodiment constitutes part of a refrigeration cycle mechanism, characterized in that it comprises: a connecting pipe for connecting the compressor unit to other devices constituting the refrigeration cycle mechanism; and a sealing plug capable of sealing an opening at one end of the connecting pipe, the connecting pipe having: an expanded portion located at one end of the connecting pipe; and a primary portion located at a position closer to the other end of the connecting pipe than the expanded portion, formed with an inner diameter smaller than the inner diameter of the expanded portion, and the sealing plug having: a sealing plug body portion, which seals when the sealing plug is installed in the connecting pipe. The sealing plug has an opening at one end of the connecting pipe and a hole formed along its length, extending from one end face of the sealing plug to the middle. The main body of the sealing plug has a large-diameter portion located at a position corresponding to the expanded pipe portion and a small-diameter portion located at a position closer to the front end of the sealing plug than the large-diameter portion, located at a position corresponding to the original pipe portion. The diameter of the hole is set to be smaller at the front end side opposite to the base end side of one end face of the sealing plug. The front end of the hole is located in the region of the small-diameter portion in the length direction. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view showing an example of the structure of a compressor device according to one embodiment.

[0015] Figure 2 This refers to a compressor device according to one embodiment. Figure 1 The cross-sectional view is shown by enlarging the arrow X2 portion.

[0016] Figure 3 This is an example of a hole forming a sealing bolt using a straight hole. Figure 2 A sectional view.

[0017] Figure 4 This is a cross-sectional view showing an example of a sealing bolt according to one embodiment.

[0018] Figure 5 This is a cross-sectional view showing another example of a sealing bolt according to one embodiment.

[0019] Figure 6 This is a cross-sectional view showing another example of a sealing bolt according to one embodiment.

[0020] Figure 7 This is a cross-sectional view showing another example of a sealing bolt according to one embodiment.

[0021] Explanation of reference numerals in the attached figures 1. Refrigeration cycle mechanism; 10. Compressor unit; 41. Suction side connecting pipe (connecting pipe); 42. Discharge side connecting pipe (connecting pipe); 50. Sealing bolt; 52. Sealing bolt body; 521. Large diameter part; 522. Small diameter part; 53. Hole. Detailed Implementation

[0022] Hereinafter, a compressor device according to one embodiment will be described with reference to the accompanying drawings. Note that in the drawings, for ease of explanation, the dimensions of each structure are sometimes appropriately enlarged as needed, and the dimensional ratios of the structures may not be the same as in reality. In this embodiment, the compressor device 10 constitutes part of a refrigeration cycle mechanism 1 for, for example, a refrigeration device or an air conditioner. The refrigeration cycle mechanism 1 is configured to include, in addition to the compressor device 10, an evaporator, condenser, etc. (not shown), which are other devices. Furthermore, the refrigeration cycle mechanism 1 has a refrigerant flow path that allows refrigerant to flow to the compressor device 10 and other devices. The refrigerant circulates in the refrigeration cycle mechanism 1 while repeatedly undergoing phase changes.

[0023] The compressor unit 10 includes a receiver 20 and a compressor 30. The receiver 20 is located upstream of the compressor 30, separating the refrigerant into a liquid phase and a gaseous phase, and supplying the gaseous phase refrigerant to the compressor 30. "Upstream" refers to the side upstream in the direction of refrigerant flow within the refrigeration cycle mechanism 1. The compressor 30 compresses the refrigerant after passing through the receiver 20 into a high-temperature, high-pressure gaseous refrigerant, which is then discharged.

[0024] The compressor 30 is, for example, a vertical rotary compressor. The compressor 30 is not limited to rotary type; it can also be other types such as reciprocating type. Furthermore, in Figure 1 In this design, the side of the compressor 30 that is vertically lower is designated as the lower side of the compressor 30, and the opposite side of the mounting surface that is vertically upper is designated as the upper side of the compressor 30. For example... Figure 1 As shown, the compressor 30 has a housing 31, a drive mechanism 32, a compression mechanism 33, and multiple connecting pipes 41, 42. The housing 31 is, for example, formed as a cylindrical shape closed at both ends. The compressor 30 is connected to the receiver 20 via a suction pipe 301. Refrigerant drawn from the receiver 20 into the compressor 30 is guided into the interior of the housing 31 via the suction pipe 301. The housing 31 houses the drive mechanism 32 and the compression mechanism 33 within its interior.

[0025] The drive mechanism 32 functions to drive the compression mechanism 33. The drive mechanism 32 and the compression mechanism 33 are connected via a rotating shaft 34. The drive mechanism 32 is the drive source that rotates the rotating shaft 34. The rotating shaft 34 is coaxially arranged with the housing 31. The drive mechanism 32 is, for example, an internal rotor type electric motor, having a stator 321 fixed to the inner circumferential surface of the housing 31 and a rotor 322 disposed inside the stator 321. The stator 321 is fixed to the rotating shaft 34. The stator 321 is configured to include an iron core (not shown) and a coil wound around the iron core. By energizing the coil, the rotor 322 rotates together with the rotating shaft 34.

[0026] The compression mechanism 33 functions to compress refrigerant. Located below the drive mechanism 32, the compression mechanism 33 is immersed in lubricating oil (not shown) that lubricates it. The compression mechanism 33 may be configured, for example, with a known dual-cylinder structure. In this case, the compression mechanism 33 includes a first cylinder 331, a second cylinder 332, a partition plate 333, a first bearing 334, a second bearing 335, a first roller 336, and a second roller 337. The first cylinder 331 and the second cylinder 332 are formed in annular shape. The first cylinder 331 is fixed, for example, to the inner circumferential surface of the housing 31, forming a first cylinder chamber 331a. The second cylinder 332 is spaced apart from the first cylinder 331 along the axial direction of the rotating shaft 34. The partition plate 333 is located between the first cylinder 331 and the second cylinder 332. The second cylinder 332 is fixed via the partition plate 333.

[0027] The first bearing 334 is located at the upper part of the first cylinder body 331. The first bearing 334 covers the first cylinder chamber 331a from above. The first bearing 334 cooperates with the partition plate 333 to close the first cylinder chamber 331a. The second bearing 335 is located at the lower part of the second cylinder 332. The second bearing 335 covers the second cylinder chamber 332a from below. The second bearing 335 cooperates with the partition plate 333 to close the second cylinder chamber 332a. The first roller 336 and the second roller 337 are disposed in each cylinder chamber 331a and 332a, and rotate eccentrically relative to the axis of rotation 34.

[0028] Additionally, blades (not shown) are provided in each cylinder 331 and 332. These blades, for example, slide against the outer circumferential surfaces of rollers 336 and 337, dividing the cylinder chambers 331a and 332a into an intake chamber and a compression chamber. Furthermore, the blades move forward and backward relative to the cylinders 331 and 332 in accordance with the rotation of rollers 336 and 337, thereby changing the volume of the intake and compression chambers of each cylinder chamber 331a and 332a, compressing the gaseous refrigerant drawn in from the intake pipe 301. The high-temperature, high-pressure gaseous refrigerant compressed by each cylinder chamber 331a and 332a is then discharged into the housing 31 via a discharge valve mechanism (not shown) located on the side of the first bearing 334. The discharged gaseous refrigerant rises inside the housing 31.

[0029] Multiple connecting pipes 41 and 42 form part of the refrigerant flow path of the refrigeration cycle mechanism 1, used to connect the compressor unit 10 to other devices. Hereinafter, connecting pipe 41 will be referred to as the suction-side connecting pipe 41, and connecting pipe 42 will be referred to as the discharge-side connecting pipe 42. Figure 1 As shown, the suction-side connecting pipe 41 and the discharge-side connecting pipe 42 are formed into cylindrical shapes with openings at both ends, extending in a straight line along the vertical direction. The suction-side connecting pipe 41 is, for example, located at the upper end of the reservoir 20, supplying refrigerant after passing through other devices to the reservoir 20. One end of the suction-side connecting pipe 41 is located outside the reservoir 20, and the other end of the suction-side connecting pipe 41 is located inside the reservoir 20.

[0030] The discharge-side connecting pipe 42 is provided, for example, at the upper end of the compressor 30, to supply refrigerant discharged from the compressor 30 to other devices. One end of the discharge-side connecting pipe 42 is located outside the housing 31, and the other end of the discharge-side connecting pipe 42 is located inside the housing 31. The gaseous refrigerant discharged from each cylinder chamber 331a, 332a flows to the outside of the compressor unit 10 via the discharge-side connecting pipe 42.

[0031] Here, when manufacturing the refrigeration cycle mechanism 1, if external gas flows into the housing 31, adverse conditions may occur, such as the drive mechanism 32 and the compression mechanism 33 disposed in the housing 31 coming into contact with air and rusting. Therefore, the openings 41a and 42a at one end of the suction-side connecting pipe 41 and the discharge-side connecting pipe 42 need to be sealed to prevent external air from flowing in.

[0032] Therefore, sealing plugs 50 are provided at the openings 41a and 42a at one end of the suction-side connecting pipe 41 and the discharge-side connecting pipe 42. The sealing plugs 50 can seal the openings 41a and 42a at one end of the suction-side connecting pipe 41 and the discharge-side connecting pipe 42. The sealing plugs 50 are used in the manufacture of the refrigeration cycle mechanism 1 to maintain an airtight state within the compressor unit 10. In this embodiment, the suction-side connecting pipe 41 and the discharge-side connecting pipe 42 are constructed with the same structure and shape; therefore, in the following description, the discharge-side connecting pipe 42 will be used as an example.

[0033] like Figure 2 As shown, the discharge-side connecting pipe 42 has an expanding section 421 and a primary section 422. The expanding section 421 is located at one end of the discharge-side connecting pipe 42 and is disposed in the portion forming the opening 42a. The expanding section 421 has a predetermined length. The primary section 422 is located at the other end of the discharge-side connecting pipe 42, closer to the expanding section 421. The primary section 422 is formed with an inner diameter smaller than the inner diameter of the expanding section 421.

[0034] The expanding section 421 and the original section 422 are formed continuously. In this case, a reducing section 423 is provided between the expanding section 421 and the original section 422. The reducing section 423 is formed by gradually reducing the diameter from one end to the other end of the discharge-side connecting pipe 42. Thus, the discharge-side connecting pipe 42 is formed by a stepped structure with a diameter change in the length direction. Furthermore, the length direction is consistent with the vertical direction of the compressor 30. The suction-side connecting pipe 41 has an expanding section 411, an original section 412, and a reducing section 413 with the same structure and shape as the expanding section 421, the original section 422, and the reducing section 423.

[0035] The sealing plug 50 is made of cold-resistant and flexible rubber, such as EPDM rubber. The sealing plug 50 has a generally T-shaped overall form. The sealing plug 50 has a base end 51, a main body 52, and a hole 53. The base end 51 is located on the base end side of the sealing plug 50, outside the discharge-side connecting pipe 42 when the sealing plug 50 is sealing the opening 42a. The base end 51 is, for example, formed as a flat plate. When the sealing plug 50 is installed in the discharge-side connecting pipe 42, the base end 51 covers one end of the discharge-side connecting pipe 42. That is, the base end 51 has a diameter larger than the outer diameter of the discharge-side connecting pipe 42. With the sealing plug 50 installed in the discharge-side connecting pipe 42, the operator can remove the sealing plug 50 by hooking their finger around the base end 51 and pulling it upwards.

[0036] The main body 52 of the sealing plug is located approximately at the center of the base end 51 and extends from the base end 51 toward the front end of the sealing plug 50. The main body 52 seals the opening 42a of the discharge-side connecting pipe 42 when the sealing plug 50 is installed on the discharge-side connecting pipe 42. That is, the main body 52 is housed within the discharge-side connecting pipe 42 when the sealing plug 50 is installed on the discharge-side connecting pipe 42. The length of the main body 52 is set to be longer than the length of the expansion section 421. That is, when the sealing plug 50 is installed on the discharge-side connecting pipe 42, the front end 52a of the main body 52, i.e., the front end of the sealing plug 50, is located within the area of ​​the original pipe section 422.

[0037] The sealing plug body 52 has a large-diameter portion 521 and a small-diameter portion 522. The large-diameter portion 521 is located at the base end of the sealing plug body 52. ​​When the sealing plug 50 is installed in the discharge-side connecting pipe 42, the large-diameter portion 521 is positioned corresponding to the expansion portion 421. The length of the large-diameter portion 521 is set to be approximately the same as the length of the expansion portion 421 of the discharge-side connecting pipe 42. The outer diameter D1 of the large-diameter portion 521 is set to be approximately the same as or slightly smaller than the inner diameter of the expansion portion 421. The small-diameter portion 522 is located closer to the front end of the sealing plug 50 than the large-diameter portion 521. When the sealing plug 50 is installed in the discharge-side connecting pipe 42, the small-diameter portion 522 is positioned corresponding to the original pipe portion 422. Furthermore, the sealing plug body 52 is chamfered in a tapered shape at a position closer to the front end than the small-diameter portion 522. That is, in this embodiment, the front end of the small diameter portion 522 is located on the base end side compared to the front end 52a of the sealing bolt body portion 52.

[0038] The outer diameter D2 of the small diameter portion 522 is set to be smaller than the outer diameter D1 of the large diameter portion 521, and is set to be approximately the same as or slightly smaller than the inner diameter of the original pipe portion 422. The large diameter portion 521 and the small diameter portion 522 are formed continuously. In this case, an inclined portion 523 is provided between the large diameter portion 521 and the small diameter portion 522. The inclined portion 523 is formed by gradually narrowing its diameter from the base end side of the sealing plug body portion 52 toward the front end side. The length of the inclined portion 523 is set to be approximately the same as the length of the narrowed diameter portion 423 of the discharge side connecting pipe 42. The sealing plug body portion 52 is formed by a stepped structure with a diameter change in the length direction.

[0039] A hole 53 is formed along the length of the sealing plug 50, extending from one end face of the sealing plug 50, in this case, the base end face 50a, to the middle. That is, the hole 53 is formed through the base end face 51 and extends to the middle of the sealing plug body 52. ​​The central axis O1 of the hole 53 coincides with the central axis of the sealing plug 50. When the sealing plug 50 is installed in the discharge-side connecting pipe 42, the hole 53 provides... Figure 2 The rod-shaped portion 911 of the special clamp 91, indicated by the double-dotted line, is inserted. The rod-shaped portion 911 is, for example, cylindrical. With the rod-shaped portion 911 of the special clamp 91 inserted into the hole 53, the operator presses the sealing plug 50 into the discharge-side connecting pipe 42, thereby installing the sealing plug 50 onto the discharge-side connecting pipe 42. When the sealing plug 50 is pressed into the discharge-side connecting pipe 42, the front end of the rod-shaped portion 911 of the special clamp 91 is pressed against the front end 53a of the hole 53.

[0040] Here, as Figure 3As shown, when the hole 53 is formed by a straight hole with a diameter larger than that of the rod-shaped portion 911 of the special clamp 91, there is a possibility that the front end of the rod-shaped portion 911 may be pressed against the front end of the hole 53 when the central axis O2 of the rod-shaped portion 911 is offset relative to the central axis O1 of the hole 53. In this state, if the sealing plug 50 is pressed into the discharge-side connecting pipe 42, the sealing plug 50 is inserted into the discharge-side connecting pipe 42 with the front end of the sealing plug 50 tilted at a predetermined angle θ from the central axis O1 of the hole 53. In this case, Figure 3 In the area R shown by the dashed line, the outer peripheral surface of the sealing plug body 52 is in excessive contact with the inner peripheral surface of the discharge side connecting pipe 42. This not only makes it difficult to insert the sealing plug 50, leading to a deterioration in workability, but also makes it impossible to ensure the tightness of the sealing plug 50 relative to the discharge side connecting pipe 42.

[0041] Therefore, in this embodiment, as Figure 2 As shown, the diameter of the hole 53 is set to be smaller on the front end side, opposite to the base end side, compared to the base end side located on one end face 50a of the sealing plug 50. Furthermore, the diameter of the front end side of the hole 53 is set to a size that allows the rod-shaped portion 911 of the special clamp 91 to be inserted. Therefore, when the rod-shaped portion 911 of the special clamp 91 is pressed against the front end 53a of the hole 53 and the sealing plug 50 is inserted into the discharge-side connecting pipe 42, the rod-shaped portion 911 is less likely to deviate from the central axis O1 of the hole 53. Thus, the workability and airtightness of the sealing plug 50 during insertion can be ensured. In addition, the wall thickness of the sealing plug body portion 52 surrounding the front end side of the hole 53 can be easily ensured, thereby increasing the tightness of the sealing plug 50 relative to the discharge-side connecting pipe 42.

[0042] The hole portion 53 can be configured to have a large-diameter portion 531 on the base end side of the hole portion 53 and a small-diameter portion 532 on the front end side of the hole portion 53. The large-diameter portion 531 and the small-diameter portion 532 are formed by straight holes with a constant diameter. The large-diameter portion 531 extends from the end face 50a on the base end side of the sealing plug 50 to the middle of the large-diameter portion 521 of the sealing plug body portion 52. The diameter d1 of the large-diameter portion 531 is set to be larger than the diameter of the rod-shaped portion 911 of the special clamp 91.

[0043] The small-diameter portion 532 extends from the large-diameter portion 521 of the sealing bolt body portion 52 to the middle of the small-diameter portion 522. The front end of the small-diameter portion 532 constitutes the front end 53a of the hole portion 53. That is, the front end 53a of the hole portion 53 is located within the region of the small-diameter portion 522 in the longitudinal direction. Furthermore, the diameter d2 of the small-diameter portion 532 is the same as the diameter of the front end side of the hole portion 53, and is set to a size that allows the rod-shaped portion 911 of the special clamp 91 to be inserted.

[0044] The large-diameter portion 531 and the small-diameter portion 532 of the hole are formed continuously. In this case, an inclined portion 533 is provided between the large-diameter portion 531 and the small-diameter portion 532. The inclined portion 533 is formed with a gradually decreasing diameter from the base end side to the front end side of the hole 53. Thus, the hole 53 is formed by a stepped structure with a diameter change in the length direction.

[0045] like Figure 4 As shown, within the region of the small-diameter portion 522, the distance L1 from the front end 53a of the hole 53 to the front end of the small-diameter portion 522 is set to be greater than or equal to the minimum distance W1 from the hole 53 to the outer peripheral surface of the sealing bolt body portion 52. Furthermore, the distance L1 from the front end 53a of the hole 53 to the front end of the small-diameter portion 522 is set to be greater than the length L2 of the hole 53 within the region of the small-diameter portion 522. In other words, within the total length L0 of the small-diameter portion 522, the length of the sealing bolt body portion 52 is set to be greater than the length of the hole 53.

[0046] Furthermore, the minimum distance W1 from the hole 53 to the outer peripheral surface of the sealing bolt body 52 within the region of the small diameter portion 522 is set to be greater than the minimum distance W0 from the hole 53 to the outer peripheral surface of the sealing bolt body 52 within the region of the large diameter portion 521. That is, the sealing bolt 50 is formed such that the wall thickness of the large diameter portion 521 is thinner than the wall thickness of the small diameter portion 522.

[0047] According to the embodiment described above, the sealing plug 50 dedicated to the compressor unit 10 can seal the openings 41a and 42a on one end side of the connecting pipes 41 and 42 used to connect the compressor unit 10, which is part of the refrigeration cycle mechanism 1, and other devices constituting the refrigeration cycle mechanism 1. The sealing plug 50 has a sealing plug body portion 52 and a hole portion 53. The sealing plug body portion 52 seals the openings 42a and 42a on one end side of the connecting pipes 41 and 42 when the sealing plug 50 is installed in the connecting pipes 41 and 42. The hole portion 53 is formed along the length direction of the sealing plug 50 and extends from one end face 50a of the sealing plug 50 to the middle.

[0048] The sealing plug body 52 has a large-diameter portion 521 and a small-diameter portion 522. The large-diameter portion 521 is located at the base end side of the sealing plug body 52. ​​The small-diameter portion 522 is located at a position closer to the front end side of the sealing plug 50 than the large-diameter portion 521, and is formed with an outer diameter D2 smaller than the outer diameter D1 of the large-diameter portion 521. The diameter of the hole portion 53 is set to be smaller at the front end side, which is opposite to the base end side, compared to the base end side located at one end face 50a of the sealing plug 50. Furthermore, the front end 53a of the hole portion 53 is located within the region of the small-diameter portion 522 in the longitudinal direction.

[0049] Therefore, during the manufacturing process of the compressor unit 10, when the special clamp 91 is pressed against the front end 53a of the hole 53 and the sealing bolt 50 is inserted into the connecting pipes 41 and 42, the central axis O2 of the special clamp 91 is prevented from deviating from the central axis O1 of the hole 53. This suppresses the formation of gaps between the outer peripheral surface of the sealing bolt 50 and the inner peripheral surface of the connecting pipes 41 and 42, allowing the sealing bolt 50 to fit tightly against the connecting pipes 41 and 42 without compromising workability. Thus, workability during the insertion of the sealing bolt 50 and the airtightness of the sealing bolt 50 are ensured. Furthermore, the tightness between the sealing bolt 50 and the connecting pipes 41 and 42 at the position corresponding to the small diameter portion 522 can be appropriately ensured.

[0050] Within the area of ​​the small-diameter portion 522, the distance L1 from the front end 53a of the hole 53 to the front end of the small-diameter portion 522 is set to be greater than or equal to the minimum distance W1 from the hole 53 to the outer peripheral surface of the sealing plug body portion 52. Therefore, when the special clamp 91 is pressed against the front end 53a of the hole 53 and the sealing plug 50 is inserted into the connecting pipes 41 and 42, the occurrence of defects such as the front end of the sealing plug 50 breaking due to the force exerted by the special clamp 91 can be suppressed. This improves the reliability of the sealing plug 50.

[0051] The minimum distance W1 from the hole 53 to the outer peripheral surface of the sealing bolt body 52 within the region of the small diameter portion 522 is set to be greater than the minimum distance W0 from the hole 53 to the outer peripheral surface of the sealing bolt body 52 within the region of the large diameter portion 521. Therefore, by making the wall thickness of the large diameter portion 521 thinner than that of the small diameter portion 522, sufficient strength can be ensured while minimizing material costs.

[0052] Furthermore, the distance L1 from the front end 53a of the hole 53 to the front end of the small diameter portion 522 is set to be greater than the length L2 of the hole 53 within the region of the small diameter portion 522. As a result, the wall thickness of the front end portion of the sealing bolt body 52 in the length direction can be appropriately ensured, thereby further ensuring the tightness between the sealing bolt 50 and the connecting pipes 41 and 42.

[0053] The hole 53 is formed in a stepped structure by a large-diameter portion 531 on the base end side and a small-diameter portion 532 on the front end side. This enables both the ease of insertion of the sealing plug 50 and ensures the airtightness of the sealing plug 50.

[0054] Furthermore, the hole 53 is not limited to a two-stage stepped structure of the large-diameter hole 531 and the small-diameter hole 532, but can also be composed of a stepped structure of three or more stages. Figure 5In one example, a hole 53 is shown that has a three-tiered stepped structure. In this case, the hole 53 has a middle diameter portion 534. The middle diameter portion 534 is located between the major diameter portion 531 and the minor diameter portion 532 of the hole in the longitudinal direction.

[0055] The diameter d3 of the intermediate diameter portion 534 is set to be smaller than the diameter d1 of the large diameter portion 531 and larger than the diameter d2 of the small diameter portion 532. Furthermore, a hole-inclined portion 535 is provided between the intermediate diameter portion 534 and either the large diameter portion 531 or the small diameter portion 532. The hole-inclined portion 535 is formed with a gradually decreasing diameter from the base end side of the hole 53 towards the front end side. Therefore, when the sealing plug 50 is inserted into the connecting pipes 41 and 42, for example, the intermediate diameter portion 534 and the small diameter portion 532 can be distinguished based on the outer diameter of the special clamp 91. This improves the convenience of using the sealing plug 50.

[0056] In addition, such as Figure 6 As shown in the example, the inclined portion 523 can also be configured to be located within the region of the inclined portion 533 of the hole in the length direction. That is, the hole 53 can also be configured such that the length of the inclined portion 535 connecting the stepped structures of the two stages, the large-diameter portion 531 and the small-diameter portion 532 of the hole, is set to be longer than the length of the inclined portion 523, and the entire region of the small-diameter portion 532 converges within the range of the small-diameter portion 522. Figure 6 The example shows an example of the following structure: in the length direction, the inclined portion 523 is aligned with the base end side of the inclined portion 533 of the hole, and the length SL2 of the inclined portion 533 of the hole is set to be longer than the length SL1 of the inclined portion 523, so that the small diameter portion 532 of the hole is housed within the range of the small diameter portion 522.

[0057] With this configuration, the entire area of ​​the small-diameter portion 532 is located further forward than the inclined portion 523. This allows for stable insertion of the sealing bolt 50 into the connecting pipes 41 and 42 using the special clamp 91, even when the frictional resistance acting on the small-diameter portion 532, which requires a tighter fit, is greater. Furthermore, because the length SL2 of the inclined portion 533 is increased, the inclination angle of the inclined portion 533 becomes gentler, preventing operational errors when inserting the special clamp 91 into the small-diameter portion 532.

[0058] In addition, such as Figure 6As shown in the example, the base end side of the hole 53, i.e., the base end side of the large diameter portion 531 of the hole, can also be formed into a tapered shape that expands in diameter from the front end side toward the base end side. Furthermore, the inclination angle of the base end side of the large diameter portion 531, the inclination angle of the inclined portion 523, and the inclination angle of the front end side of the sealing bolt body 52 can be set to approximately the same inclination angle θ1. The inclination angle refers to the inclination angle relative to the length direction. For example, the inclination angle θ1 is set to approximately 30 degrees. Additionally, the inclination angle θ2 of the inclined portion 533 of the hole can be set to an angle smaller than the inclination angle θ1. For example, the inclination angle θ2 is set to 20 degrees. Furthermore, the inclination angles of the base end side of the large diameter portion 531, the inclination angle of the inclined portion 523, and the inclination angle of the front end side of the sealing bolt body 52 can also be different inclination angles.

[0059] Furthermore, the hole 53 is not limited to a stepped structure; it can also be constructed of a tapered shape. In this case, such as... Figure 7 As shown in the example, the diameter of the hole 53 gradually decreases from the base end side towards the front end side. This structure ensures both the ease of insertion of the sealing plug 50 and the airtightness of the sealing plug 50. Furthermore, when the hole 53 is constructed with a tapered shape, it may also be located near the front end of the hole 53. Figure 7 The diameter of the hole 53 in the area Rs indicated by the double-dotted line does not change. As a result, the rod-shaped portion 911 of the special clamp 91 can be easily pressed against the front end 53a of the hole 53.

[0060] Furthermore, the sealing plug 50 is made of EPDM rubber. For example, nitrogen gas is sealed inside the compressor 30 to prevent mechanical parts such as the drive mechanism 32 and compression mechanism 33 located inside from rusting. By making the sealing plug 50 from EPDM rubber, which has excellent cold resistance, deformation of the sealing plug 50 can be reduced even when the compressor unit 10 is stored in a low-temperature environment, thus preventing nitrogen gas leakage from the compressor 30 to the outside. Therefore, improved reliability can be achieved.

[0061] The above description describes one embodiment of the present invention, but this embodiment is provided as an example and is not intended to limit the scope of the invention. New embodiments can be implemented in various other ways, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. This embodiment and its variations are included within the scope and spirit of the invention, and are also included within the scope of the claims and their equivalents.

Claims

1. A sealing plug for a compressor unit, capable of sealing an opening at one end of a connecting pipe used to connect a compressor unit constituting part of a refrigeration cycle mechanism to other devices constituting said refrigeration cycle mechanism, characterized in that, The sealing bolt has: a sealing bolt body portion that seals an opening at one end of the connecting pipe when the sealing bolt is installed in the connecting pipe; and a hole portion formed along the length of the sealing bolt, extending from one end face of the sealing bolt to the middle. The sealing plug body has: a large-diameter portion located at the base end of the sealing plug body; and a small-diameter portion located at a position closer to the front end of the sealing plug than the large-diameter portion, and formed with an outer diameter smaller than the outer diameter of the large-diameter portion. The diameter of the hole is set to be smaller on the front end side, which is opposite to the base end side, compared to the base end side located on one end face of the sealing bolt. The front end of the hole is located within the region of the small diameter portion in the longitudinal direction.

2. The sealing bolt for compressor devices according to claim 1, characterized in that, Within the region of the small diameter portion, the distance from the front end of the hole to the front end of the small diameter portion is set to be greater than or equal to the minimum distance from the hole to the outer peripheral surface of the sealing bolt body.

3. The sealing bolt for compressor devices according to claim 1, characterized in that, The minimum distance from the hole to the outer peripheral surface of the sealing bolt body within the region of the small diameter portion is set to be greater than the minimum distance from the hole to the outer peripheral surface of the sealing bolt body within the region of the large diameter portion.

4. The sealing bolt for compressor devices according to claim 1, characterized in that, The distance from the front end of the hole to the front end of the small diameter portion is set to be greater than the length of the hole within the region of the small diameter portion.

5. The sealing bolt for compressor devices according to claim 1, characterized in that, The hole is formed in a stepped structure by a large-diameter portion of the hole on the base end side and a small-diameter portion of the hole on the front end side.

6. The sealing bolt for compressor devices according to claim 5, characterized in that, The main body of the sealing plug also has an inclined portion disposed between the large-diameter portion and the small-diameter portion, which gradually narrows from the base end side of the sealing plug main body towards the front end side. The hole also has an inclined portion disposed between the large-diameter portion and the small-diameter portion of the hole, which gradually narrows from the base end side toward the front end side of the hole. The inclined portion is located within the region of the inclined portion of the hole in the longitudinal direction.

7. The sealing bolt for compressor devices according to claim 1, characterized in that, The diameter of the hole gradually decreases from the base side to the front side.

8. The sealing bolt for compressor units according to any one of claims 1 to 7, characterized in that, The sealing plug is made of EPDM rubber.

9. A compressor device, forming part of a refrigeration cycle mechanism, characterized in that, have: Connecting pipes for connecting the compressor unit to other devices constituting the refrigeration cycle mechanism; and A sealing plug, capable of sealing an opening at one end of the connecting pipe. The connecting pipe has: an expanded section located at one end of the connecting pipe; and a primary section located at the other end of the connecting pipe, closer to the expanded section, and formed with an inner diameter smaller than that of the expanded section. The sealing bolt has: a sealing bolt body portion that seals an opening at one end of the connecting pipe when the sealing bolt is installed in the connecting pipe; and a hole portion formed along the length of the sealing bolt, extending from one end face of the sealing bolt to the middle. The sealing plug body has: a large-diameter portion disposed at a position corresponding to the expanded tube portion; and a small-diameter portion located at a position closer to the front end of the sealing plug than the large-diameter portion, disposed at a position corresponding to the original tube portion. The diameter of the hole is set to be smaller on the front end side, which is opposite to the base end side, compared to the base end side located on one end face of the sealing bolt. The front end of the hole is located within the region of the small diameter portion in the longitudinal direction.

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