Safety valve of compressor

Abstract

Provided is a safety valve for a compressor, which eliminates the problem that exhaust gas is ejected from a gap of a cover by restricting the ejection direction of the exhaust gas by mounting the cover to a valve main body via an elastic body, does not require the use of an elastic body having a complicated shape, does not require directionality in assembly of the elastic body, and is easy to assemble. The present invention is provided with: a columnar valve body 2 provided with an internal passage 5 through which exhaust gas flows, a second end part 9 in which an outlet 8 of the internal passage 5 is opened, and a fitting part 10 formed on the outer peripheral surface; a cover (3) provided with leg parts (31a-31d) fitted to the fitting part (10) of the valve body (2), and a shield part (32) facing the second end part (9); an O-ring (4) sandwiched between the second end (9) of the valve body (2) and the shield section (32) of the cover (3) so as to surround the outlet (8); in the shielding part 32, a groove part 33 is formed from a part facing the inner side of the O-ring 4 to the outer edge of the shielding part 32, the inner side and the outer side of the O-ring 4 are communicated through the groove part 33, and the ejection direction of the exhaust gas is limited.

Description

Technical Field

[0001] The present invention relates to a safety valve for a compressor used in a refrigeration cycle of a vehicle or the like. Background Art

[0002] A compressor used in a refrigeration cycle for an air conditioner is disposed in an engine room of a vehicle. The compressor is provided with a safety valve. The safety valve releases exhaust gas including lubricating oil and refrigerant gas to the outside when the internal pressure of the compressor abnormally rises. For example, in Figure 10 the shown compressor 100, the safety valve 1 has a discharge port on the side of the cylinder head 100a facing the pulley 100b side, and when the internal pressure of the compressor abnormally rises, high-pressure exhaust gas is ejected from the inside of the compressor toward the front (pulley side) of the compressor.

[0003] However, if the lubricating oil in the exhaust gas ejected from the safety valve 1 adheres to high-temperature components in the engine room, there is a concern about smoking, fire, etc. In addition, as Figure 9 shown, if the exhaust gas is ejected toward the pulley around which the drive belt for transmitting power from the engine is wound, the lubricating oil in the exhaust gas will cause the drive belt and the electromagnetic clutch to slip. Therefore, there is a concern about a malfunction that may interfere with the power transmission to auxiliary machines including the compressor.

[0004] Then, in order to avoid the malfunction of the exhaust gas ejected from the valve body being ejected in an undesirable direction, a safety valve as shown in Patent Document 1 is considered.

[0005] As Figure 11 shown, it includes: a cover 102 that can be detachably attached to the valve body 101; an elastomer 103 that covers the discharge hole 101a of the valve body 101 and is in close contact with the valve body 101, and is sandwiched between the valve body 101 and the cover 102 in a compressed state. On the close contact surface of the elastomer 103 in close contact with the valve body 101, a groove 104 is formed from a portion facing the discharge hole 101a to the outer edge. Through the groove 104 and the surface of the valve body 101 covering the groove 104, an exhaust gas flow path 105 is provided for ejecting the exhaust gas discharged from the discharge hole 101a toward the outer edge of the opening of the groove 104.

[0006] Here, as Figure 11As shown in (c), the cover 102 is formed of a plate material having a hexagonal shielding portion 102a and legs 102b, 102c. The legs 102b, 102c radially protrude from five sides of the shielding portion 102a except for the side corresponding to the outer edge of the opening of the groove 104 of the elastomer 103. Each of the legs 102b, 102c is manufactured by bending substantially at right angles along each side of the shielding portion 102a. The locking claw 102d formed on the leg 102b is locked to the locking protrusion 101b of the valve body 101.

[0007] Therefore, a gap (slit) extending from the shielding portion is formed between the legs adjacent in the circumferential direction of the cover. However, an elastomer 103 having a groove 104 formed from the portion facing the discharge hole 101a to the outer edge is interposed between the cover 102 and the valve body 101. Therefore, the discharged gas discharged from the discharge hole 101a is ejected only from the outer edge portion of the opening of the groove 104 of the elastomer 103. Therefore, it is possible to avoid the problem of ejection in an undesired direction through the above-mentioned gap (slit).

[0008] Prior Art Documents

[0009] Patent Documents

[0010] Patent Document 1: Japanese Patent Laid-Open No. 9-166081 Summary of the Invention

[0011] Technical Problem to be Solved by the Invention

[0012] However, conventionally, since the groove 104 for forming the discharge gas flow path 105 is formed in the elastomer 103 sandwiched between the shielding portion 102a of the cover 102 and the end face of the valve body 101, the shape of the elastomer becomes complicated, and there is a concern about an increase in manufacturing cost. In addition, when the cover 102 is installed on the valve body 101, it is necessary to align the outer edge of the opening of the groove 104 of the elastomer 103 with the portion of the cover 102 where no leg is provided. Therefore, attention needs to be paid to the assembly direction of the elastomer, and the assembly process of the safety valve becomes complicated.

[0013] The present invention has been made in view of the above circumstances, and its main object is to provide a safety valve for a compressor that can eliminate the problem of discharged gas ejecting from the gap even when a gap is formed in the cover, and does not require the use of an elastomer with a complicated shape, and does not require the assembly direction of the elastomer during assembly, and can be easily assembled.

[0014] Technical Solution for Solving the Technical Problem

[0015] In order to solve the above problems, first, the safety valve for a compressor of the present invention discharges discharged gas to the outside when the internal pressure of the compressor rises compared with a predetermined pressure, and is characterized by including:

[0016] A columnar valve body having an internal passage through which the discharged gas flows, a first end portion provided with an inlet of the internal passage, a second end portion provided with an outlet of the internal passage, and a fitting portion formed on the outer peripheral surface;

[0017] A cover having a leg portion fitted to the fitting portion of the valve body and a shielding portion opposed to the second end portion;

[0018] An annular elastic body sandwiched between the second end portion of the valve body and the shielding portion of the cover so as to surround the outlet;

[0019] In the shielding portion, a groove portion is formed from a portion facing the inner side of the elastic body to the outer edge of the shielding portion.

[0020] Therefore, the elastic body is sandwiched between the second end portion and the shielding portion so as to surround the outlet of the internal passage of the valve body. However, in the shielding portion, a groove portion is formed from a portion facing the inner side of the elastic body to the outer edge. Therefore, the inner side and the outer side of the elastic body are communicated through the groove portion, and a discharge passage for discharging the discharged gas from the outlet to the outside is formed. Therefore, the elastic body sandwiched between the second end portion and the shielding portion only needs to be an annular shape surrounding the outlet, and does not need to have a complicated shape.

[0021] Moreover, since the annular elastic body is sandwiched between the second end portion of the valve body and the shielding portion so as to surround the outlet, even if a gap is formed between the legs on the radially outer side of the elastic body or a gap is formed between the shielding portion and the legs, there will be no problem of the discharged gas leaking from other than the groove portion.

[0022] And if it is an annular elastic body, no matter where the portion opposed to the groove portion is located in the circumferential direction, the portion facing the inner side of the elastic body of the shielding portion and the portion facing the outer side can be communicated through the groove portion. Therefore, the inner side and the outer side of the elastic body are only connected by the groove portion formed in the shielding portion, and thus the assembly of the elastic body does not require directionality, and the assembly becomes easy.

[0023] Here, second, preferably, based on the safety valve of the compressor described in the first, the contact surface of the elastic body with the second end portion of the valve body is in close contact over the entire circumference, and is in close contact with the shielding portion of the cover except for the portion opposed to the groove portion.

[0024] Even when there is a gap (slit) between adjacent feet or a gap is formed between the feet and the shielding portion, since the elastomer is in close contact with the shielding portion except for the portion where the abutting surface of the second end of the valve body faces the groove portion, the discharged gas only jets out from the groove portion, and it is possible to eliminate the defect that the discharged gas leaks through the above-mentioned gap (slit).

[0025] Here, third, preferably, on the basis of the safety valve of the compressor described in the first or second item, the elastomer only needs to be annular and can be of any shape. For example, a general-purpose elastomer such as an O-ring can be used.

[0026] By using an O-ring as the elastomer, no special processing needs to be performed on the elastomer, and the assembly of the elastomer does not require directionality, so the assembly becomes easy.

[0027] In addition, fourth, preferably, on the basis of the safety valve of the compressor described in the first to third items, on the abutting surface of the valve body, a boss portion having an outer diameter smaller than the inner diameter of the elastomer protrudes from the abutting surface, and the elastomer is disposed around the boss portion provided on the abutting surface of the valve body.

[0028] According to such a structure, since the elastomer is disposed around the boss portion, the positioning of the elastomer can be easily and reliably performed, and when the high-pressure discharged gas blows out from the outlet, the elastomer will not be detached from the radial opening due to the pressure of the high-pressure discharged gas.

[0029] In addition, fifth, preferably, on the basis of the safety valve of the compressor described in the first to third items, on the cover, a radial opening is formed adjacent to the outer edge of the shielding portion and the groove portion, and a restricting portion for restricting the radial movement of the elastomer is provided in the radial opening.

[0030] Even when no boss portion is formed on the abutting surface of the valve body and a radial opening having a width wider than the outer diameter of the elastomer is formed on the cover, since a restricting portion for restricting the radial movement of the elastomer is provided in the radial opening, it is possible to avoid the defect that the elastomer is displaced radially and detached from the radial opening when the high-pressure discharged gas blows out from the outlet.

[0031] Here, sixth, preferably, on the basis of the safety valve of the compressor described in the fifth item, the width of the radial opening is formed to be narrower than the outer diameter of the elastomer due to the restricting portion.

[0032] Here, seventh, preferably, on the basis of the safety valve of the compressor described in the sixth item, the restricting portion is formed by a protruding piece protruding from the foot portion toward the radial opening.

[0033] According to such a structure, the width of the radial opening is narrowed by the restricting portion, so that it is possible to prevent the elastomer from radially shifting and detaching from the radial opening when the high-pressure exhaust gas blows out from the discharge hole.

[0034] Further, eighth, preferably, on the basis of the safety valve of the compressor described in the sixth item, the restricting portion may also be formed by the feet adjacent to the radial opening. That is, the radial movement of the elastomer can also be restricted by making the distance between the feet on both sides of the radial opening smaller than the outer diameter of the elastomer.

[0035] According to such a structure, the restricting portion is formed by the feet, so there is no need to add a new structure for restricting the radial movement of the elastomer.

[0036] In addition, ninth, preferably, on the basis of the safety valve of the compressor described in the first to seventh items, a plurality of feet are formed in the circumferential direction of the shielding portion, and each of the feet is integrally formed at the outer edge of the shielding portion.

[0037] Further, tenth, preferably, on the basis of the safety valve of the compressor described in the first to seventh items, a plurality of feet are formed in the circumferential direction of the shielding portion, and one of the feet is integrally formed at the outer edge of the shielding portion, and the other feet are connected along the circumferential direction of the shielding portion starting from this foot so that all the feet are integrally formed.

[0038] Advantages of the Invention

[0039] As described above, according to the safety valve of the compressor of the present invention, the annular elastomer is sandwiched between the second end portion and the shielding portion so as to surround the outlet of the internal passage of the valve body, and a groove portion is formed from the inner side portion of the shielding portion facing the elastomer to the outer edge, thereby forming a discharge passage for the exhaust gas. Therefore, the exhaust gas will not be ejected from the gaps or slits formed between the feet of the cover and between the shielding plate and the feet.

[0040] Moreover, there is no need to use an elastomer with a complex shape, and during assembly, it is only necessary to install the cover by adjusting the opening position of the groove portion so as to achieve the desired ejection direction. Therefore, the assembly can also be carried out simply. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 FIG. 1 is a view showing a first embodiment of the safety valve of the compressor of the present invention. (a) is a front view thereof, and is a view observed from direction A in (b). (b) is a side view of the safety valve in (a) observed from direction B. (c) is a perspective view observed from an intermediate angle between (a) and (b).

[0042] Figure 2Exploded perspective view of the safety valve of the compressor of the first embodiment.

[0043] Figure 3 Cross-sectional view of the safety valve of the compressor of the first embodiment. (a) is a cross-sectional view along Figure 1 The AA-AA line of (b). (b) is Figure 1 Cross-sectional view of the safety valve of (a) along the BB-BB line.

[0044] Figure 4 Figure (a) shows the end face of the second end of the valve body. Figure 4 Figure (b) shows the state in which an annular elastomer (O-ring) is disposed around the boss portion on the end face of the second end of the valve body. Figure 4 Figure (c) shows the inside of the cover. Figure 4 Figure (d) shows the state in which an annular elastomer (O-ring) is disposed inside the cover.

[0045] Figure 5 Figure (a) is a perspective view of an example of observing the cover from the side opposite to the radial opening. Figure 5 Figure (b) is a perspective view of another example of observing the cover from the side opposite to the radial opening.

[0046] Figure 6 Figure showing the second embodiment of the safety valve of the compressor of the present invention. (a) is its front view and is a view observed from the C direction of (b). (b) is a side view of the safety valve of (a) observed from the D direction. (c) is a perspective view observed from an intermediate angle between (a) and (b).

[0047] Figure 7 Exploded perspective view of the safety valve of the compressor of the second embodiment.

[0048] Figure 8 Cross-sectional view of the safety valve of the compressor of the second embodiment. (a) is a cross-sectional view along Figure 6 The CC-CC line of (b). (b) is along Figure 6 Cross-sectional view of (a) along the DD-DD line.

[0049] Figure 9 Figure showing another example of the cover. (a) is its top view, (b) is its rear view, (c) is its front view, (d) is its right side view, (e) is its bottom view, and (f) is its perspective view.

[0050] Figure 10 Figure showing an example of a compressor equipped with a safety valve.

[0051] Figure 11FIG. 0 is a view showing a conventional safety valve, (a) is a perspective view thereof, (b) is a cross-sectional view taken along line EE-EE of (a), (c) is a developed view of the cover, and (d) is a perspective view of the elastomer. DETAILED DESCRIPTION

[0052] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0053] In Figures 1 to 3 FIG. 1 shows a first embodiment of the safety valve 1 of the present invention.

[0054] The safety valve 1 is configured to include: a valve body 2 fixed to the housing of the compressor by screwing; a cover 3 mounted on the end portion on the gas outflow side of the valve body 2 (the front end portion of the valve body protruding from the housing of the compressor); and an O-ring 4 as an annular elastomer interposed between the valve body 2 and the cover 3.

[0055] The valve body 2 is formed in a columnar shape and has an internal passage 5 formed along the axial direction on its axis for the discharged gas to flow through, a first end portion 7 having an inlet 6 for the internal passage 5, a threaded portion 21 screwed with the housing on the outer peripheral surface of the first end portion 7, a second end portion 9 having an outlet 8 for the internal passage 5, and a fitting portion 10 formed on the outer peripheral surface of the second end portion 9.

[0056] Further, inside the valve body 2, a valve body accommodation space 11 is formed in the middle of the internal passage 5. In this valve body accommodation space 11, there are: a valve body 13 which is accommodated in the valve body accommodation space 11 so as to be displaceable in the axial direction and opens and closes an inflow side passage 12 connecting an unillustrated discharge chamber of the compressor and the valve body accommodation space 11; a biasing member 14 which is constituted by a compression spring that biases the valve body 13 in the direction of closing the inflow side passage 12; and a cover (spring seat) 15 which is provided to block the valve body accommodation space 11 at the outlet 8 and supports the biasing member (compression spring) 14 disposed between the valve body 13 and the cover 15. The inner diameter of a part of the outlet 8 is enlarged compared with the valve body accommodation space 11, and the cover (spring seat) 15 is fitted into the outlet 8 so as to block the valve body accommodation space 11. Moreover, an outflow side passage 16 connecting the valve body accommodation space 11 and the outside of the valve body 2 is formed in the center of the cover (spring seat) 15.

[0057] The fitting portion 10 is formed by forming an annular groove 18 substantially at the center of the side surface of the head 17 of the valve body 2 having a hexagonal cross-section with a predetermined width in the axial direction from the second end portion 9. That is, the fitting portion 10 forms an annular groove 18 having an inner diameter smaller than the distance between the axis of the valve body 2 and the outer side surface of the head 17 substantially at the center of the outer peripheral surface of the head 17 in the axial direction, and uses the outflow side surface of the annular groove 18 substantially perpendicular to the axis as the locking surface 18a, and can hook and fix the claw portions 311a to 311d of the leg portions 31a to 31d of the cover 3 described later in the axial direction.

[0058] Also, as Figure 4 shown in (a) and (b), an annular boss portion 19 centered on the axis protruding in the axial direction is integrally formed at the second end portion 9, and an abutting surface 9a for abutting the O-ring 4 is formed throughout the circumference around the boss portion 19. The O-ring 4 is made of an elastic material such as nitrile rubber, silicone rubber, EPDM, or soft resin, and is well-known per se.

[0059] The inner diameter of the boss portion 19 is formed to be larger than the inner diameter of the valve body accommodation space 11 and is formed to be substantially equal to the outer diameter of the cover body 15.

[0060] In addition, the outer diameter of the boss portion 19 is formed to be a diameter substantially equal to the inner diameter of the O-ring 4. Therefore, when the O-ring 4 is fitted around the boss portion 19, the O-ring 4 is positioned and does not move in the radial direction.

[0061] Moreover, the cover 3 described below is attached to the second end portion 9 of the valve body 2 via the O-ring 4.

[0062] The cover 3 is formed by processing a plate-like metal material. As Figure 4 shown in (c), (d), Figure 5 and (a), the cover 3 includes leg portions 31a, 31b, 31c, 31d that are fitted to the fitting portion 10 of the valve body 2 and a shielding portion 32 that faces the second end portion 9 in the axial direction.

[0063] The shielding portion 32 is formed in a substantially hexagonal shape in accordance with the cross-sectional shape of the head 17 of the valve body 2. The leg portions 31a, 31b, 31c, and 31d are formed by bending from the four sides of the outer peripheral edge of the shielding portion 32 other than the two adjacent sides. That is, the leg portions 31a to 31d extending radially outward in a radial direction are provided on the four sides of the outer peripheral edge of the shielding portion 32, and are formed by bending the leg portions 31a to 31d at a substantially right angle with respect to the shielding portion 32. Therefore, a gap (slit) S is formed between the circumferentially adjacent leg portions formed by bending (between the leg portion 31a and the leg portion 31b, between the leg portion 31b and the leg portion 31c, between the leg portion 31c and the leg portion 31d). Moreover, at the front end portions of the respective leg portions 31a to 31d, claw portions 311a to 311d are formed so that the front end portions of the leg portions are bent inward to be able to be caught by the catching surface 18a of the annular groove 18.

[0064] The lengths of the leg portions 31a to 31d (the distance between the shielding portion 32 and the front ends of the claw portions) are set to be the lengths at which the claw portions 311a to 311d of the leg portions 31a to 31d are caught by the fitting portion (the catching surface 18a of the annular groove 18) in a state where the O-ring 4 is interposed between the shielding portion 32 and the valve body 2 and compressed.

[0065] Moreover, a groove portion 33 is formed in the shielding portion 32, and the groove portion 33 is recessed from the portion facing the inside of the O-ring 4 to the outer edge of the shielding portion 32 and extends in the radial direction. That is, the groove portion 33 is formed such that a part of the shielding portion 32 bulges away from the second end portion 9 from the middle of the shielding portion 32 to the two sides of the outer edge of the shielding portion 32 where the leg portions 31a to 31d are not provided. Therefore, on the outer peripheral surface of the cover 3, a radially open portion 34 where no leg portion is formed is formed in a range of a central angle of about 120 degrees, and the radially open portion 34 is continuously formed so as to overlap the groove portion 33.

[0066] The width between a pair of leg portions opposed in the radial direction of the cover 3 (the distance between the leg portion 31a and the leg portion 31d) is formed to be substantially equal to the outer diameter of the O-ring 4, and the width of the groove portion 33 is formed to be smaller than the width between a pair of leg portions opposed in the radial direction and substantially equal to the inner diameter of the O-ring 4.

[0067] Therefore, a U-shaped contact surface 3a with which the O-ring 4 contacts is formed around the groove portion 33 of the shielding portion 32 of the cover 3, that is, between the groove portion 33 and the respective leg portions 31a to 31d (see Figure 4 (c)), and the O-ring 4 does not contact the cover 3 in a range of a central angle of about 120 degrees. And since the radially open portion 34 is formed by not providing leg portions on two adjacent sides of the shielding portion 32, it is formed to have a width substantially equal to the width between a pair of leg portions opposed in the radial direction, that is, substantially equal to the outer diameter of the O-ring 4.

[0068] Therefore, an O-ring 4 is disposed around the boss portion 19 of the second end portion 9 of the valve body 2. In this state, when the cover 3 is axially assembled to the second end portion of the valve body 2, the O-ring 4 is sandwiched in a tightly fitted state between the abutting surface 9a around the boss portion 19 of the second end portion 9 and the U-shaped abutting surface 3a around the groove portion 33 of the cover 3. If the claw portions 311a - 322d of the leg portions 31a - 31d are engaged with the engaging surface 18a of the annular groove 18 as the fitting portion 10 to fit the cover 3 to the head portion 17 of the valve body 2, the O-ring 4 is clamped and fixed in a compressed state between the second end portion 9 of the valve body 2 and the shielding portion 32.

[0069] Moreover, a gas discharge passage 36 that connects the inside and the outside of the O-ring 4 is formed through the gap between the groove portion 33 formed in the shielding portion 32, the end surface of the second end portion 9, and the O-ring 4.

[0070] Therefore, when the internal pressure of the compressor becomes an abnormal pressure and the valve body 13 of the safety valve 1 rises, and the high-pressure discharge gas is discharged from the outlet 8 (outlet side passage 16) via the valve body accommodation space 11, as Figure 3 shown in (b), Figure 4 shown in (d), the discharged gas collides with the shielding portion 32, changes its direction by 90 degrees, then flows along the groove portion 33, and is ejected to the outside of the compressor through the gap between the O-ring 4 and the groove portion 33 and via the groove portion 33 and the radially opening portion 34.

[0071] Therefore, according to the above structure, the gap (slit) S between the respective leg portions is located at a position radially outside the O-ring 4. Therefore, the shielding portion 32 and the second end portion 9 are sealed by the O-ring 4 at a position inside the gap (slit) S between the leg portions. Thus, the discharge gas is not guided to the gap (slit) S between the leg portions, and the malfunction of discharging the discharge gas from the gap (slit) S can be avoided.

[0072] In addition, an elastomer sandwiched between the valve body 2 and the cover 3 can be a general-purpose annular elastomer such as the O-ring 4. Therefore, there is no need to use an elastomer with a complex shape, and the complexity associated with the molding of the elastomer and the increase in manufacturing cost can be avoided.

[0073] Furthermore, as long as the opening directions of the groove portion 33 and the radially opening portion 34 of the cover 3 are set in any direction, the ejection direction of the high-pressure discharge gas can be set in any direction. Therefore, during assembly, it can also be simply assembled in such a way that the desired ejection direction is achieved.

[0074] Further, in the above example, a boss portion 19 is provided at the second end portion 9 of the valve body 2, and an O-ring 4 is disposed around the boss portion 19. Therefore, when the safety valve 1 operates and the high-pressure discharge gas jets out from the outflow-side passage 16, changes direction, and is discharged along the groove portion 33, it is possible to avoid the adverse situation where the O-ring 4 moves radially and disengages from the radial opening portion 34.

[0075] In addition, in the above example, as Figure 5 shown in (a), by bending the leg portions 31a, 31b, 31c, and 31d that extend radially outward from the four sides of the shielding portion 32 by approximately 90 degrees with respect to the shielding portion 32, a plurality of leg portions 31a to 31d are integrally formed at the outer edge of the shielding portion 32. In addition to the above example, as Figure 5 shown in (b), among the plurality of leg portions 31a to 31d formed along the circumferential direction of the shielding portion 32, only one leg portion 31a can be made into a leg portion 31a that extends radially outward integrally from the outer edge of the shielding portion 32, and the other leg portions 31b, 31c, and 31d are connected along the circumferential direction of the shielding portion 32 starting from the leg portion 31a, and all the leg portions 31a to 31d are integrally formed.

[0076] In Figures 6 to 8 shows the second embodiment of the safety valve 1 of the compressor.

[0077] In this example, the valve body 2 is different from the Figures 1 to 3 structure in that the boss portion 19 is not formed at the second end portion 9.

[0078] In addition, in this example, as the cover 3, as Figure 5 shown in (b), it is configured such that only one leg portion is a leg portion 31a that extends radially outward integrally from the outer edge of the shielding portion 32, and the other leg portions 31b, 31c, and 31d are connected along the circumferential direction of the shielding portion 32 starting from the leg portion 31a, and all the leg portions 31a to 31d are integrally formed. However, restricting portions 35a and 35b for restricting the radial movement of the O-ring 4 are provided at the radial opening portion 34.

[0079] The restricting portions 35a and 35b are formed by protruding pieces that protrude from the leg portions 31a and 31d toward the radial opening portion 34, and the substantial width of the radial opening portion 34 (the width between the restricting portions 35a and 35b) is formed to be substantially narrower than the outer diameter of the O-ring 4.

[0080] It should be noted that in this example, it shows the case where the leg portion 31a at one end among the plurality of leg portions 31a to 31d connected along the circumferential direction is integrally formed with the shielding portion 32, but any other leg portion 31b, 31c, or 31d can also be integrally formed with the shielding portion 32.

[0081] Other components are the same as those in the first embodiment, so the same reference numerals are used for the same parts and the description thereof is omitted.

[0082] Therefore, in the second embodiment, since the boss portion 19 that restricts the radial movement of the O-ring 4 is not formed on the valve body 2, there is a concern that the high-pressure gas ejected from the outlet 8 may cause the O-ring 4 to move radially and be pushed out from the radial opening 34 without the restricting portions 35a and 35b. However, the restricting portions 35a and 35b protrude from the leg portions 31a and 31d toward the radial opening 34, making the width of the radial opening 34 narrower than the outer diameter of the O-ring 4 (making the width between the restricting portions 35a and 35b smaller than the outer diameter of the O-ring 4), so that the malfunction of the O-ring 4 being pushed out from the radial opening 34 can be avoided.

[0083] In addition, as Figure 5 shown in (a), by bending the leg portions 31a, 31b, 31c, and 31d extending radially outward from the four sides of the shielding portion 32 by approximately 90 degrees with respect to the shielding portion 32, even in a structure in which a plurality of leg portions are integrally formed at the outer edge of the shielding portion 32, the cover 3 can be formed by protruding the restricting portions 35a and 35b from the leg portions 31a and 31d toward the radial opening 34.

[0084] Therefore, in such a structure, similarly to the foregoing embodiment, when the internal pressure of the compressor becomes extremely high and the valve body 13 of the safety valve 1 rises, and the high-pressure discharge gas is discharged from the outlet 8 (outlet side passage 16) via the valve body accommodation space 11, the discharged discharge gas collides with the shielding portion 32 and changes its direction by 90 degrees and then flows along the groove portion 33, and is released from the safety valve 1 through the gap between the O-ring 4 and the groove portion 33.

[0085] A gap (slit) S is formed between the leg portions 31b to 31d of the cover 3 and the shielding portion 32, and this gap is located radially outside the O-ring 4. Therefore, in a portion closer to the front side than the gap (slit) S, the shielding portion 32 of the cover 3 and the second end portion 9 of the valve body 2 are sealed by the O-ring 4, so that the malfunction of the discharge gas spraying out from the gap (slit) S can be avoided.

[0086] Moreover, a general-purpose elastomer such as the O-ring 4 is used as the elastomer sandwiched between the valve body 2 and the cover 3, so there is no need to use an elastomer with a complex shape, and the complexity in forming the elastomer and the cost increase can be avoided.

[0087] In addition, as long as the opening directions of the groove portion 33 and the radial opening 34 of the cover 3 are set in any direction, the ejection direction of the high-pressure discharge gas can be arbitrarily changed, so that it can be simply assembled into the desired ejection direction during assembly.

[0088] In addition, in the above-described embodiment, as an example of the annular elastic body, the case of using the O-ring 4 has been described. However, as long as it is sandwiched between the second end portion 9 of the valve body 2 and the shielding portion 32 of the cover 3 and is in close contact with the entire circumference of the end face of the second end portion of the valve body 2, and is in close contact with the shielding portion 32 of the cover 3 except for the portion facing the groove portion 33, elastic bodies of other shapes can also be used.

[0089] Moreover, in the above structure, the example in which the cover 3 is formed by processing a metal plate has been described. However, the same effect can be obtained by forming the same cover with a resin material.

[0090] In addition, in the above structure, the following example is shown: in the cover 3 having the shielding portion 32 that is substantially hexagonal in plan view, the feet are not provided on two adjacent sides of the shielding portion 32, and the radial opening portion 34 is formed in the range of a central angle of about 120 degrees on the outer peripheral surface of the cover 3, and the groove portion 33 is extended and provided on both sides of the outer edge of the shielding portion 32 where the feet 31a to 31d are not provided (refer to Figure 4 of (c), (d), etc.), but it can also be as Figure 9 shown, only the feet are not provided on one side of the shielding portion 32 of the cover 3, and the radial opening portion 34 is formed in the range of a central angle of about 60 degrees on the outer peripheral surface of the cover 3, and the groove portion 33 is extended and provided on one side of the outer edge of the shielding portion 32 where the feet are not provided.

[0091] Figure 9 The cover 3 shown is an example in which a plurality of feet 31a, 31b, 31c, 31d, 31e extending radially outward from the five sides of the shielding portion 32 are bent by approximately 90 degrees with respect to the shielding portion 32 to integrally form a plurality of feet 31a to 31e on the outer edge of the shielding portion 32. However, it can also be the same as the structure of Figure 5 of (b), and only one of the plurality of feet 31a to 31e provided in the circumferential direction of the shielding portion 32 is integrally formed on the outer edge of the shielding portion 32, and the other feet are connected along the circumferential direction of the shielding portion 32 starting from this foot to integrally form all the feet 31a to 31e.

[0092] In an example of such a cover 3, the opening widths of the groove portion 33 and the radial opening portion 34 are narrower than those of the cover 3 shown in Figures 1 to 8 , so that the ejection direction of the exhaust gas can be made more directional. And in this example, when the O-ring 4 is clamped by the valve body 2 and the cover 3, the width of the radial opening portion 34 is smaller than the outer diameter of the O-ring 4. Therefore, it is not necessary to provide Figure 6 separately, Figure 7The components for forming the restricting portions 35a and 35b as shown can cause the leg portions 31a and 31e on both sides of the radially opening portion 34 to function as the restricting portions 35c and 35d.

[0093] In addition, in Figure 9 the example shown in the cover 3, the shielding portion 32 is hexagonal to match the cross-sectional shape of the head portion 17 of the valve body 2. However, the sides of the shielding portion 32 do not need to be equal (not necessarily a regular hexagon), and the sides adjacent to the sides without leg portions can be relatively long, and the portions where the groove portion 33 and the radially opening portion 34 open can be relatively far from the center of the cover 3. In such a structure, the directivity of the direction in which the discharged gas is ejected can be further improved.

[0094] Description of Reference Numerals

[0095] 1: Safety valve;

[0096] 2: Valve body;

[0097] 3: Cover;

[0098] 4: O-ring;

[0099] 5: Internal passage;

[0100] 6: Inlet;

[0101] 7: First end;

[0102] 8: Outlet;

[0103] 9: Second end;

[0104] 10: Fitting portion;

[0105] 19: Boss portion;

[0106] 31a, 31b, 31c, 31d, 31e: Leg portions;

[0107] 32: Shielding portion;

[0108] 33: Groove portion;

[0109] 34: Radially opening portion;

[0110] 35a, 35b, 35c, 35d: Restricting portions.

Claims

1. A safety valve (1) of a compressor, which discharges exhaust gas to the outside when the internal pressure of the compressor (100) rises compared to a predetermined pressure, characterized in that, Comprising: A columnar valve body (2) having an internal passage (5) through which the discharged gas flows, a first end portion (7) provided with an inlet (6) of the internal passage (5), a second end portion (9) provided with an outlet (8) of the internal passage (5), and a fitting portion (10) formed on the outer peripheral surface; A cover (3) having legs (31a, 31b, 31c, 31d) fitted to the fitting portion (10) of the valve body (2) and a shielding portion (32) opposed to the second end portion (9); A ring-shaped elastic body sandwiched between the second end portion (9) of the valve body (2) and the shielding portion (32) of the cover (3) so as to surround the outlet (8); In the shielding portion (32), a groove portion (33) is formed from a portion facing the inner side of the elastic body to the outer edge of the shielding portion (32).

2. The safety valve for a compressor according to claim 1, wherein: The contact surface (9a) of the elastic body with respect to the second end portion (9) of the valve body (2) is in close contact over the entire circumference, and is in close contact with the shielding portion (32) of the cover (3) except for the portion opposed to the groove portion (33).

3. The safety valve for a compressor according to claim 1 or 2, wherein: The elastic body is an O-ring (4).

4. The safety valve for a compressor according to claim 1, wherein: On the contact surface (9a) of the valve body (2), a boss portion (19) having an outer diameter smaller than the inner diameter of the elastic body projects from the second end portion (9), The elastic body is disposed around the boss portion (19) provided at the second end portion (9) of the valve body (2).

5. The safety valve for a compressor according to claim 1, wherein: On the cover (3), a radially open portion (34) is formed adjacent to the outer edge of the shielding portion (32) and the groove portion (33), and restricting portions (35a, 35b, 35c, 35d) for restricting the radial movement of the elastic body are provided.

6. The safety valve for a compressor according to claim 5, wherein: The width of the radially open portion (34) is formed to be narrower than the outer diameter of the elastic body due to the restricting portions (35a, 35b, 35c, 35d).

7. The safety valve for a compressor according to claim 6, wherein: The restricting portions (35a, 35b) are formed by protruding pieces protruding from the legs (31a, 31d) toward the radially open portion (34).

8. The safety valve for a compressor according to claim 6, wherein: The restricting portions (35c, 35d) are formed by the legs (31a, 31e) adjacent to the radially open portion.

9. The safety valve for a compressor according to claim 1, wherein: A plurality of the feet (31a, 31b, 31c, 31d, 31e) are formed in the circumferential direction of the shielding portion (32), and each of the feet (31a, 31b, 31c, 31d, 31e) is integrally formed at the outer edge of the shielding portion (32).

10. The safety valve of a compressor according to claim 1, wherein A plurality of the feet (31a, 31b, 31c, 31d, 31e) are formed in the circumferential direction of the shielding portion (32), and one of the feet (31a) is integrally formed at the outer edge of the shielding portion (32), and the other feet (31b, 31c, 31d) are connected along the circumferential direction of the shielding portion (32) starting from the foot (31a) so that all of the feet (31a, 31b, 31c, 31d, 31e) are integrally formed.

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