JP5285539B2 - Compressor device - Google Patents

Description

  INDUSTRIAL APPLICABILITY The present invention is suitable for puncture emergency repair in which a sealing agent and compressed air are sequentially fed into a punctured tire to perform puncture repair, and particularly, burns caused by high-temperature compressed air discharged from a relief valve. The present invention relates to a compressor device that prevents the above.

  As a compressor device for puncture emergency repair, for example, as schematically shown in FIG. 11, a motor b, a piston d coupled to the motor b via a crank mechanism c, and a reciprocating motion of the piston d are schematically shown. A compressor body f including a cylinder e that can be accommodated, and a relief valve g that is attached to the cylinder e and releases the overpressure of the compressor body f are frequently used (see, for example, Patent Document 1).

  Since this main compressor device is strongly required to be lightweight and compact, there is a great restriction on the arrangement of each member in terms of space. For example, a hose i1 connected to the pressure gauge h, a hose i2 for supplying compressed air to the tire side, and the relief valve g are connected to the cylinder e, and of these, the hose i1 and i2 are wide. Space is required. Therefore, inevitably, the relief valve g is arranged along the thickness direction of the storage case a, that is, the tip of the relief valve g is directed toward the lower plate portion a2 (or the upper plate portion a1) of the storage case a. I have to do it. At this time, the distance L1 between the tip of the relief valve g and the lower plate portion a2 is, for example, 5 mm or less, and is very close to the lower plate portion a2.

JP 2005-344570 A

  However, the conventional relief valve g exhausts high-temperature compressed air that has become overpressure from its tip. Therefore, the exhausted high-temperature compressed air directly hits the adjacent lower plate portion a2 and locally raises the temperature of that portion to a high temperature. As a result, it is surprised when the user touches it without knowing it, and it is desired to improve it in terms of safety, such as letting go of the device, dropping it, or hitting it with a hand, resulting in secondary injury or failure. .

  Therefore, the present invention is based on the formation of an opening in the peripheral wall of the cylindrical body that constitutes the relief valve, and can exhaust high-temperature compressed air that has become overpressure without directly hitting an adjacent storage case, An object of the present invention is to provide a compressor device capable of improving safety by suppressing a local temperature rise of a storage case.

In order to solve the above-mentioned problem, the invention of claim 1 of the present application relates to a housing case, a motor, a piston connected to the motor via a crank mechanism, a reciprocating housing for the piston, and the piston. A compressor main body comprising a cylinder that forms a pump chamber for compressing air therebetween, and a compressor device that is attached to the cylinder and contains a relief valve that releases the overpressure of the main compressor body,
The storage case has a flat rectangular box shape in which the upper end and the lower end of a small wall wall portion composed of side plate portions on both sides and front and rear side plate portions are closed with an upper plate portion and a lower plate portion,
The relief valve is
The cylinder protrudes from the cylinder in a direction perpendicular to the axial direction of the cylinder, and one end communicates with the pump chamber and the other end opens toward the upper plate portion or the lower plate portion. And a cylindrical body having a central hole in which a valve seat is formed between the one end and the other end;
A valve shaft that is arranged in the central hole and opens and closes the valve seat portion;
A spring body arranged in the central hole and biasing the valve shaft toward the valve seat;
With a spring retainer that attaches to the other end of the central hole and retains the spring body,
An opening for discharging compressed air exhausted from between the valve seat and the valve shaft is formed in the peripheral wall of the cylindrical body.

  According to a second aspect of the present invention, the opening is formed by a slit provided in the cylindrical body and extending from the other end to one end.

  According to a third aspect of the present invention, the opening is a hole provided in the cylindrical body.

According to a fourth aspect of the present invention, the opening has an opening area of 0.7 mm ² or more.

  In the present invention, as described above, an exhaust opening is formed in the peripheral wall of the cylindrical body constituting the relief valve. Therefore, high-temperature compressed air that has been overpressured can be discharged from the opening into the case without directly hitting the adjacent storage case, and the storage case can be prevented from locally rising to a high temperature. Can be increased.

It is a perspective view which shows one Example of the compressor apparatus of this invention. It is a disassembled perspective view which shows a compressor main body. It is sectional drawing which shows the operating state of a compressor main body. (A), (b) is sectional drawing which shows the operating state of a relief valve. It is a side view which shows a relief valve. It is drawing explaining the direction of an opening part. (A)-(c) is a side view explaining the other shape of an opening part. It is a side view explaining the other example of a relief valve. It is sectional drawing which shows a shielding board. It is drawing explaining the position where temperature was measured in Table 2. (A)-(c) is sectional drawing which shows the problem of the conventional compressor apparatus.

  Hereinafter, embodiments of the present invention will be described in detail. As shown in FIG. 1, the compressor apparatus 1 of this embodiment includes a compressor body 1 having a cylinder 5 that forms a pump chamber 4 between a motor M and a piston 3 connected to the motor M in a storage case 2. 6 and a relief valve 7 which is attached to the cylinder 5 and releases the overpressure of the compressor body 6 is housed.

  The storage case 2 has an upper plate portion 9U and a lower plate portion 9L at the upper and lower ends of a small-height peripheral wall portion 8 comprising side plate portions 8a and 8b on both sides and front and rear side plate portions 8c and 8d, respectively. It is formed as a closed horizontal rectangular box. In this example, the storage case 2 is formed so as to be disassembled into upper and lower case portions 2A and 2B.

  As the motor M, various commercially available DC motors that operate with a 12V DC power source of an automobile can be used. The motor M is connected to a power cord 10 having a power plug 10 </ b> A that can be connected to a cigarette lighter socket of an automobile at the tip via a power switch SW that is attached to the upper plate portion 9 </ b> U of the storage case 2. A cooling fan M2 is connected to the motor M on the side opposite to the output shaft M1 (shown in FIG. 2), and intake air that takes in outside air is introduced into one side plate portion 8a that the cooling fan M2 faces. A mouth 11 is formed. The intake port 11 is provided with a filter, a louver or the like to prevent dust and rain from entering.

  Next, as shown in FIG. 2, the compressor body 6 includes a piston 3 coupled to the motor M via a crank mechanism 12, and accommodates the piston 3 so as to be capable of reciprocating between the piston 3 and the piston 3. And a cylinder 5 forming a pump chamber 4 for compressing air.

  Specifically, the motor M is connected to a gear reduction means 14 having a well-known structure in which a plurality of gears are combined. For example, the motor rotation speed is reduced to about 1/3 to 1/8, and the most output side gear is used. It is transmitted to a certain rotating body 14A. The crank mechanism 12 is formed of a crank 12a fixed to the rotating body 14A and a rod 12b whose one end is pivotally supported by the crank 12a. The rotating body 14A itself may be configured as the crank 12a.

  The piston 3 is disposed at the other end of the rod 12b. In this example, the rod 12b and the piston 3 are formed as an integrally molded body made of FRP. As shown in FIG. 3, the piston 3 has an intake hole 15A extending through the piston 3 in the axial direction, and the intake hole 15A is closed from the pump chamber side with a spring property. For example, rubber Then, the intake valve 15 using the valve 15B made of an elastic body such as synthetic resin or metal is formed. The piston 3 is housed in the inner cavity of the cylinder 5, and forms a pump chamber 4 capable of compressing air between the piston 3. When the piston 3 moves backward to increase the volume of the pump chamber 4, the compressor body 6 opens the intake valve 15 to allow outside air to flow into the pump chamber 4, and the piston 3 moves forward. When the intake valve 15 is closed, the air in the pump chamber 4 is compressed to increase the pressure.

  In the present example, the cylinder 5 is a surge that suppresses pressure pulsation caused by the piston 3 by storing compressed air from the pump chamber 4 at the rear end side of the cylindrical cylinder body 16 forming the pump chamber 4. A surge tank portion 18 forming the tank chamber 17 is attached.

  The surge tank chamber 17 is electrically connected to the pump chamber 4 through a small hole 16A1 formed in a partition wall 16A that closes the rear end of the cylinder body 16. Further, the surge tank portion 18 has a cylindrical shape smaller than the cylinder body 16, and in this example, the surge tank portion 18 and the lower plate portion are displaced from the cylinder body 16 toward the upper plate portion 9U. The space between 9L is slightly larger.

  The peripheral wall of the surge tank portion 18 is connected to a nipple-shaped first connection portion 18a to which a connection hose 21 from the pressure gauge 20 is connected, and a nipple to which a connection hose 22 for supplying compressed air to the tire side is connected. The second connection portion 18b and the relief valve 7 are formed. The first and second connection portions 18a and 18b protrude toward the other side plate portions 8a and 8b. In contrast, the relief valve 7 protrudes toward the lower plate portion 9L.

  As shown in FIG. 4, the relief valve 7 includes a cylindrical body portion 23 that integrally protrudes from the surge tank portion 18 in a direction perpendicular to the axial direction of the cylinder 5. The center hole 24 of the cylindrical body portion 23 has one end E1 leading to the surge tank chamber 17 and the other end E2 opening toward the lower plate portion 9L, and the one end E1 and the other end E2. Between them, a tapered cone-shaped valve seat portion 24a is formed.

  Further, a valve shaft 25 that opens and closes the valve seat portion 24a and a spring body 26 that urges the valve shaft 25 toward the valve seat portion 24a are disposed in the center hole 24. A spring retainer 27 that retains the spring body 26 is attached to the other end E2 of 24. In this example, the case where the spring retainer 27 is screwed is illustrated, and the relief pressure of the relief valve 7 can be freely adjusted by the spring retainer 27 being advanced and retracted. Thus, the relief valve 7 is formed including the cylindrical body portion 23, the valve shaft 25, the spring body 26, and the spring presser 27.

  Here, in the compressor device 1 of the present embodiment, for the sake of compactness, the relief valve 7 has a distance L1 between the tip of the spring retainer 27 and the lower plate portion 9L facing it, for example, 5 mm or less (this example) 3 mm), which is very close to the lower plate portion 9L.

  And in this invention, the opening part 28 which discharges | emits the compressed air exhausted from between the said valve seat part 24a and the valve shaft 25 is formed in the surrounding wall of the said cylindrical trunk | drum 23. As shown in FIG.

  In this example, the opening 28 is formed by a slit 29 extending from the other end E2 of the center hole 24 toward the one end E1 as shown in FIGS. Strictly speaking, the opening 28 is formed between the position of the tip 27 e of the spring retainer 27 and the position of the tip 29 e of the slit 29 in the slit 29. By providing such an opening 28, high-temperature compressed air that has become overpressure can be discharged into the case without directly contacting the adjacent lower plate portion 9L, and a part of the storage case 2 can be localized. It is possible to prevent the user from being burned at a high temperature.

  A relatively large space can be provided between the relief valve 7 and the side plate portions 8a to 8d. Therefore, for example, as shown in FIG. 6, the opening 28 is directed to the side plate closest to the opening 28 of the side plates 8 a to 8 d (corresponding to the rear side plate 8 d in this example). Even in the case of opening, it is possible to ensure a sufficient distance L2 between, for example, 15 mm or more, and the temperature rise of the nearest side plate portion 8d can be suppressed low. Therefore, the direction of the opening 28 is not particularly restricted and can be formed in any direction.

The opening 28 preferably has an opening area of 0.7 mm ² or more in order to ensure necessary exhaust efficiency and to reliably release overpressure.

Further, the opening 28 may be formed as a slit 29 as in this example, or may be formed by, for example, a hole 30. In such a case, as the opening shape of the hole 30, for example, FIGS. As shown in FIG. 4, various shapes such as a circle, an ellipse (including an ellipse), and a rectangle can be adopted. Also in this case, the opening area of the hole 30 is preferably 0.7 mm ² or more. In the case of the hole 30, the cylindrical body 23 needs to be formed integrally with the cylinder 5, and then it is necessary to perform the hole processing. It is preferable from the viewpoint.

  In the case of this example, the spring retainer 27 is not formed with an exhaust hole as in the prior art. However, although not preferred, as shown in FIG. 8, the spring retainer 27 is also provided with an exhaust hole 31 similar to the conventional one extending in the same direction as the center hole 24 and opening toward the lower plate portion 9L, The opening 28 and the exhaust hole 31 can exhaust exhausted compressed air. Even in such a case, since the compressed air is dispersed and the flow rate from the exhaust hole 31 is reduced, the temperature rise of the lower plate portion 9L can be suppressed.

Although different from the present invention, as a means for preventing the compressed air from the relief valve 7 from directly hitting an adjacent storage case (for example, the lower plate portion 9L) in addition to forming the opening 28, FIG. As shown in FIG. 4, the shielding plate 40 may be provided between the opening 31a of the exhaust hole 31 provided in the spring retainer 27 and the lower plate portion 9L.
At this time, the shielding plate 40 needs to have a width Wa that can cover a shielding range Y having a diameter Dy that is at least three times the opening diameter D1 of the opening 31a with the center line j of the exhaust hole 31 as the center. It is. Further, a gap K1 of 1.0 mm or more is formed between the shielding plate 40 and the lower plate portion 9L, and a gap K2 of 1.0 mm or more is formed between the opening 31a and the shielding plate 40. is necessary.

  Such a shielding plate 40 prevents the compressed air from the opening 31a from directly hitting the lower plate portion 9L. Further, the air layer 41 formed by the gap K1 exhibits a heat insulating effect, and in combination with the shielding effect, a local temperature rise of the lower plate portion 9L can be suppressed. If the gap K1 is less than 1.0 mm, the heat insulation effect is insufficient and the temperature rise cannot be sufficiently suppressed. If the gap K2 is less than 1.0 mm, the compressed air cannot be smoothly exhausted from the opening 31a. The upper limits of the gaps K1 and K2 can be appropriately set within the constraints of the distance L1 and the lower limits of the gaps K1 and K2.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

  In order to confirm the effect of the present invention, the compressor device having the structure shown in FIG. 1 was formed according to the specifications shown in Table 1, and the temperatures at the respective positions around the relief valve on the storage case surface were measured and compared with each other. The temperature measurement positions P1 to P3 are shown in FIG.

The basic specifications of the compressor device are as follows.
・ Rating (12V, 10A specification),
・ Discharge rate (17 liters / min) (no load),
・ Relief pressure (350 kPa),
-Storage case size (width 150mm x height 128mm x height 55mm), material (ABS), wall thickness (2mm)
・ There is a cooling fan in the motor.

  Further, in the compressor device, the compressed air from the relief valve is exhausted into the storage case and is not discharged outside the storage case. As shown in FIG. 6, the opening provided in the relief valve opens toward the rear side plate, and the distance L2 from the opening to the rear side plate is 20 mm. The distance L1 (FIG. 3) from the spring retainer to the lower plate portion is 3.0 mm. In the conventional example and the first embodiment, the spring retainer is provided with an exhaust hole that opens toward the lower plate portion.

<Test method>
The tire was connected to a tire (195 / 65R15) and continuously operated for 30 minutes under the condition of a relief pressure of 350 kPa. The maximum temperatures at positions P1 to P3 (FIG. 10) on the surface of the storage case at that time were measured and compared. The room temperature in the laboratory is 23 ° C.

  In the embodiment, since the opening is formed in the peripheral wall of the cylindrical body portion of the relief valve, it can be confirmed that the local temperature rise on the surface of the storage case can be effectively suppressed.

(Reference experiment)
Instead of forming an opening in the peripheral wall of the cylindrical body, a conventional relief valve is used, and a shield plate is provided between the exhaust hole and the lower plate as shown in FIG. The temperature at the positions P1 to P3 on the surface of the storage case at that time was measured and compared. The material of the shielding plate is made of ABS as in the case. The shielding plate has a width Wa exceeding the shielding range Y. The measuring method is the same as above.

  As shown in the reference example, it can be confirmed that the local temperature rise on the surface of the storage case can be suppressed even when the shielding plate is formed.

DESCRIPTION OF SYMBOLS 1 Compressor apparatus 2 Storage case 3 Piston 4 Pump chamber 5 Cylinder 6 Compressor main body 7 Relief valve 8 Peripheral wall part 8a, 8b Side plate part and 8c, 8d Front and rear side plate part 9L Lower plate part 9U Upper plate part 12 Crank mechanism 23 Cylindrical shape Body portion 24 Center hole 24a Valve seat portion 25 Valve shaft 26 Spring body 27 Spring retainer 28 Opening portion 29 Slit 30 Hole M Motor

Claims (4)

The storage case includes a motor, a piston coupled to the motor via a crank mechanism, and a cylinder that accommodates the piston so as to reciprocate and forms a pump chamber that compresses air between the piston. A compressor device that houses a compressor main body and a relief valve that is attached to the cylinder and releases the overpressure of the compressor main body,
The storage case has a flat rectangular box shape in which the upper end and the lower end of the peripheral wall portion with a small height composed of the side plate portions on both sides and the front and rear side plate portions are closed by the upper plate portion and the lower plate portion,
The relief valve is
The cylinder protrudes from the cylinder in a direction perpendicular to the axial direction of the cylinder, and one end communicates with the pump chamber and the other end opens toward the upper plate portion or the lower plate portion. And a cylindrical body having a central hole in which a valve seat is formed between the one end and the other end;
A valve shaft that is arranged in the central hole and opens and closes the valve seat portion;
A spring body arranged in the central hole and biasing the valve shaft toward the valve seat;
With a spring retainer that attaches to the other end of the central hole and retains the spring body,
The compressor apparatus characterized by forming the opening part which discharges the compressed air exhausted from between the said valve seat part and a valve shaft in the surrounding wall of the said cylindrical trunk | drum.   2. The compressor apparatus according to claim 1, wherein the opening is formed by a slit provided in the cylindrical body and extending from the other end to one end.   The compressor device according to claim 1, wherein the opening includes a hole provided in the cylindrical body. The compressor device according to claim 1, wherein the opening has an opening area of 0.7 mm ² or more.

Images