TWM486526U - Gas pressure maintaining apparatus - Google Patents

Description

Gas pressure maintaining device

The present invention relates to a power nailing tool, and more particularly to a pressure holding device for a power nailing tool.

A power nailing tool comprises a body surrounding a body defining a gas storage chamber. The pressure maintaining technology of Taiwan Patent Publication No. 200932442 is to store a certain volume of compressed air in a body in advance and to make gas tightness. Blocking to prevent leakage of compressed air in the body, causing the working pressure in the body to decrease, and affecting the operation of the power hammering tool. However, the power nailing tool may operate after a period of time, or in some unforeseen circumstances, the body may be deflated, causing insufficient pressure of the body, and the power nailing tool shall be sent to the factory for maintenance, The original operating performance of the power nailing tool is restored, and if the above situation occurs, it cannot be processed or pre-excluded, which may cause inconvenience to the user.

Therefore, the object of the present invention is to provide a gas pressure maintaining device which can easily maintain a certain preload value of internal pressure.

Therefore, the novel gas pressure maintaining device is suitable for a power nailing tool and comprises a body and a valve member unit.

The body includes a gas storage chamber and a gas chamber defined by the inner surface and connected to each other, and a piston housed in the gas chamber, wherein the gas storage chamber stores gas and maintains a preload value.

The valve member unit is mounted on the body relative to the air chamber and communicates with the outside, and externally connects a high pressure corresponding to the preload value, allowing gas to enter the gas storage chamber from the outside, and additionally, in the gas storage In the case where the internal pressure of the chamber is greater than the preload value, gas is allowed to be discharged from the gas storage chamber.

The utility model has the advantages that the pressure of the gas storage chamber is adjusted by the valve member unit to maintain the pressure in the gas storage chamber of the body at the pre-pressure value, thereby solving the problem of insufficient pressure, and restoring the power nailing tool original Some operational performance.

10‧‧‧Power Stud Tool

1‧‧‧ Ontology

11‧‧‧ gas storage room

111‧‧‧ air chamber

12‧‧‧Piston

13‧‧‧ gas flow path

131‧‧‧ Large aperture section

132‧‧‧Small aperture section

14‧‧‧Airflow

141‧‧‧large aperture section

142‧‧‧Small aperture section

143‧‧‧ Vents

15‧‧‧Piston recovery unit

16‧‧‧Electrical power unit

2‧‧‧Valve unit

3‧‧‧ qi check valve

31‧‧‧Fixed parts

311‧‧‧Walls

312‧‧‧Air intake

313‧‧‧ Ring Department

314‧‧ ‧ room

32‧‧‧Resistance

33‧‧‧Flexible parts

4‧‧‧Exhaust check valve

41‧‧‧Fixed parts

411‧‧‧Walls

412‧‧‧ Ring Department

413‧‧ ‧ room

42‧‧‧Resistance

43‧‧‧Flexible parts

13’‧‧‧ gas flow path

131’‧‧‧ Large aperture section

132’‧‧‧Small aperture section

2'‧‧‧Valve unit

3'‧‧‧ qi check valve

31’‧‧‧First fixture

311’‧‧‧The Wall

312'‧‧‧Air intake

313’‧‧‧The Ministry of the Rings

314’‧‧‧First Room

32’‧‧‧First barrier

321'‧‧‧ Large aperture

323'‧‧‧Small aperture

322’‧‧‧ Vents

324’‧‧‧ channel

325’‧‧‧

33’‧‧‧First elastic parts

4'‧‧‧Exhaust check valve

41’‧‧‧Second fixture

42'‧‧‧Second barrier

43’‧‧‧Second elastic parts

Other features and effects of the present invention will be apparent from the following description of the drawings. FIG. 1 is a perspective view showing a first preferred embodiment of the novel gas pressure holding device mounted on a power strike. FIG. 2 is a perspective view showing a piston recovery device and an electric power device according to a first preferred embodiment; FIG. 3 is a perspective cross-sectional view showing a gas storage chamber and a gas in the first preferred embodiment. FIG. 4 is an exploded perspective view showing a valve member unit of the first preferred embodiment; FIG. 5 is a partial cross-sectional view taken along line VV of FIG. 1 is a closed state of the air supply check valve; FIG. 6 is a partial cross-sectional view taken along line VI-VI of FIG. 1, illustrating an exhaust check valve of the first preferred embodiment. Figure 7 is a cross-sectional view taken along line VII-VII of Figure 1, illustrating the plenum check valve of the first preferred embodiment in the closed state, and the exhaust check valve is FIG. 8 is a partially enlarged cross-sectional view similar to FIG. 7, illustrating the plenum check valve of the first preferred embodiment in a plenum state; FIG. 9 is a partial enlarged cross-sectional view similar to FIG. The exhaust check valve of the first preferred embodiment is in an exhaust state; FIG. 10 is a perspective view showing that a second preferred embodiment of the novel gas pressure retaining device is mounted to the power hammering tool; Figure 11 is an exploded perspective view showing a valve member unit of the second preferred embodiment; Figure 12 is a partial cross-sectional view taken along line XII-XII of Figure 10, illustrating the valve of the second preferred embodiment The unit is disposed in a gas flow path; FIG. 13 is a cross-sectional view along the line XIII-XIII in FIG. In the second preferred embodiment, the air supply check valve is in the closed state, and an exhaust check valve is in the closed state; FIG. 14 is a partial enlarged cross-sectional view similar to FIG. 13, illustrating the second preferred embodiment. The plenum check valve is in a plenum state; and FIG. 15 is a partial enlarged cross-sectional view similar to FIG. 13 illustrating the venting check valve of the second preferred embodiment in an exhaust state.

Before the present invention is described in detail, it should be noted that in the following description, some similar elements are denoted by the same reference numerals.

Referring to Figures 1, 2 and 3, the novel gas pressure retaining device is suitable for use with a powered nailing tool 10. A first preferred embodiment of the novel gas pressure retaining device comprises a body 1 and a valve member unit 2.

The body 1 includes a gas storage chamber 11 defined by the inner surface and connected to each other, and a gas chamber 111, a piston 12 accommodated in the gas chamber 111, and a gas passage 13 respectively communicating with the gas storage chamber 11 and the outside. And an air flow path 14, a piston recovery device 15, and an electric power unit 16. The piston recovery device 15 drives the piston 112 to be reset by the electric power unit 16. A motor and a battery are mounted in the electric power unit 16 to achieve wireless power driving.

The compressed gas is stored in the gas storage chamber 11 to maintain a preload value. In the preferred embodiment, the compressed gas in the gas storage chamber 11 is a general compressed gas rather than a special gas that is not easily obtained.

Referring to FIG. 4, FIG. 5 and FIG. 6, the gas flow path 13 has a large aperture section 131 and a small aperture section 132, and the outlet airflow path 14 has a large aperture section 141 and a small aperture section 142. In the first preferred embodiment, the small aperture segments 132, 142 are disposed substantially parallel to each other, and the large aperture segments 131, 141 are substantially perpendicular to the small aperture segments 132, 142, respectively. One end of the small aperture sections 132, 142 respectively communicates with the air reservoir 11, and the other end communicates with the large aperture sections 131, 141, respectively, and the large aperture sections 131, 141 are in communication with the outside. The openings of the large aperture sections 131 and 141 are respectively opened on the side of the body 1.

The valve member unit 2 is mounted on the body 1 relative to the air reservoir 11 and communicates with the outside, and includes an air supply check valve 3 (see FIG. 5) disposed in the large aperture section 131 of the gas flow path 13, and a An exhaust check valve 4 (see FIG. 6) disposed in the large-aperture section 141 of the outlet air passage 14.

Referring to FIG. 5, FIG. 7 and FIG. 8, the air supply check valve 3 has a hollow fixing member 31, a blocking member 32, and an elastic member 33 which respectively abuts against the body 1 and the blocking member 32. The fixing member 31 has a peripheral wall portion 311, and a ring portion 313 extending radially inwardly from an end edge of the peripheral wall portion 311 adjacent to the outside, and surrounding the annular portion 312 defining an air inlet hole 312. The peripheral wall portion 311 and the ring portion 313 define a chamber 314. The barrier member 32 and the elastic member 33 are received in the chamber 314. The elastic member 33 constantly generates an elastic restoring force to push the blocking member 32 toward the air inlet hole 312.

The barrier member 32 is movable relative to the ring portion 313 of the fixing member 31 between a conditioned state and a closed state. In the qi state (as shown in FIG. 8 ), the body 1 is externally connected to an external high pressure pressure greater than the pre-pressure value, and the barrier member 32 is separated from the air inlet 312 by the high pressure. The gas storage chamber 11 is brought into communication with the external high pressure, and the compressed gas is allowed to enter the gas storage chamber 11 through the gas flow passage 13 from the outside. In the closed state (as shown in FIG. 7), the external high pressure is not connected, and the external air pressure is not greater than the preload value, and the elastic member 33 abuts the blocking member 32 against the air inlet hole 312 to close the The air inlet hole 312 blocks the air storage chamber 11 from communicating with the outside, and the gas does not flow into the air storage chamber 11.

Referring to FIG. 6 , FIG. 7 and FIG. 9 , the air outlet duct 14 further has an air outlet 143 formed between the large aperture section 141 and the small aperture section 142 . . The exhaust check valve 4 has a hollow fixing member 41, a blocking member 42, and an elastic member 43 that abuts against the fixing member 41 and the blocking member 42, respectively. The fixing member 41 has a peripheral wall portion 411 and a ring portion 412 extending radially inward from the end edge of the peripheral wall portion 411 adjacent to the outside. The peripheral wall portion 411 and the ring portion 412 define a cavity 413. The barrier member 42 and the elastic member 43 are received in the cavity 413. One end of the elastic member 43 abuts against the ring portion 412 of the fixing member 41. And a resilient restoring force is generated to push the barrier member 42 toward the air outlet 143.

The blocking member 42 is movable relative to the ring portion 412 of the fixing member 41 between an exhaust state and a closed state. In the exhaust state (as shown in FIG. 9), the internal pressure of the gas storage chamber 11 is greater than the pre-pressure value, and the barrier member 42 is separated from the air outlet hole 143 by the internal pressure, so that the gas storage chamber 11 is In communication with the outside, gas is allowed to flow from the gas storage chamber 11 through the outlet gas passage 14. In the closed state (as shown in FIG. 7), the internal pressure is not greater than the preload value, and the elastic member 43 abuts the blocking member 42 against the air outlet 143 to close the air outlet 143 and block the storage. The gas chamber 11 communicates with the outside, and the gas does not flow out from the gas storage chamber 11.

Referring to FIG. 4, in the first preferred embodiment, the foregoing blocking members 32, 42 are a kind of ball, and the elastic members 33, 43 are a kind of spring, but are not limited thereto.

Referring to FIG. 5 and FIG. 7 , in the normal state, the power hammering tool 10 retains the pre-pressure value in the air storage chamber 11 of the body 1 , and the air supply check valve 3 and the exhaust check valve 4 are both Keep in their closed state to avoid deflation.

Referring to FIG. 8 and referring to FIG. 5, in the case where the pressure in the air storage chamber 11 is lower than the preload value, the external high pressure is connected outside the body 1 to supplement the compression of the high pressure greater than the preload value. The gas, the barrier member 32 is pushed away from the gas inlet hole 312 by the high pressure, and the compressed gas enters the gas storage chamber 11 through the gas flow passage 13 to raise the pressure to the preset pressure value. .

Referring to FIG. 9 and referring to FIG. 6, when the compressed gas is filled so that the internal pressure is greater than the pre-pressure value, the barrier member 42 of the exhaust check valve 4 is pushed away from the air outlet 143 by the internal pressure. The compressed gas partially located in the gas storage chamber 11 is discharged through the outlet air passage 14 to prevent the pressure from being too high.

Referring to FIG. 5 and FIG. 7 , after the pressure is adjusted, the pressure in the gas storage chamber 11 is maintained at the pre-pressure value, and the barrier member 32 of the supplemental gas check valve 3 and the barrier member 42 of the exhaust check valve 4 are closed. All of them are kept in their respective closed states, and the gas storage chamber 11 is separated from the outside to prevent gas from flowing. The compressed gas can be continuously stored in the gas storage chamber 11 and maintain the pressure in the gas storage chamber 11 of the body 1 The preload value can be operated under the normal condition.

Referring to Figures 1 and 10, the structure of a second preferred embodiment of the novel gas pressure maintaining device is substantially similar to that of the first preferred embodiment, except that in the first preferred embodiment, the valve member The unit 2 is provided with the air supply check valve 3 and the exhaust check valve 4 in the gas flow path 13 and the air flow path 14 respectively. The second preferred embodiment cancels the arrangement of the air outlet passage 14, the body 1 retains only one gas flow passage 13', and the original segment is set. The design of the valve member unit 2 is changed to an integral valve member unit 2'.

Referring to Figures 10 and 11, the valve member unit 2' is disposed in the gas flow passage 13' and includes a plenum check valve 3' and an exhaust check valve 4'.

Referring to Figures 11 and 12, the gas flow path 13' is disposed in the body 1 and communicates with the air reservoir 11 and the outside, and has a large aperture section 131' and a small aperture section 132'. In the second preferred embodiment, the small aperture section 132' is connected to the air reservoir 11 at one end, and the other end is connected to the large aperture section 131'. The large aperture section 131' is substantially perpendicular to the small aperture section 132'. And connected to the outside, and the opening is opened on the side of the body 1.

Referring to FIG. 12, FIG. 13, and FIG. 14, the air supply check valve 3' is located in the large aperture section 131', and has a hollow first fixing member 31', a first blocking member 32', and a top portion respectively. The body 1 and the first elastic member 33' of the first barrier member 32' are received. The first fixing member 31' has a peripheral wall portion 311', and a hollow ring portion 313' defining an air inlet hole 312' extending from the end edge of the peripheral wall portion 311' adjacent to the outside. The peripheral wall portion 311' and the ring portion 313' define a first chamber 314', and the first barrier member 32' and the first elastic member 33' are received in the first chamber 314'.

The first barrier member 32' of the supplemental gas check valve 3' has a large aperture portion 321', a small aperture portion 323' surrounding an air outlet 322', a large aperture portion 321' and the small aperture The portion 323' surrounds the defined channel 324', and a rim 325' disposed on the outer wall surface for the first elastic member 33' to abut. The first elastic member 33' constantly generates an elastic restoring force to urge the first blocking member 32' toward the air inlet hole 312'. The passage 324' communicates with the intake aperture 312'.

The exhaust check valve 4' is received in the passage 324' of the first barrier member 32', and has a hollow second fixing member 41' and a second blocking member 42' located in the large aperture portion 321'. And a second elastic member 43' that is respectively abutted against the second fixing member 41' and the second blocking member 42'. The second elastic member 43' constantly generates an elastic restoring force to urge the second blocking member 42' toward the air outlet hole 322'.

Referring to Figures 12, 13, and 14, the first barrier member 32' is movable relative to the ring portion 313' of the first fastener member 31' between a conditioned state and a closed state. In the qi state (as shown in FIG. 14), the first barrier member 32' is separated from the inlet port 312' by the aforementioned high pressure, and the reservoir 11 is in communication with the external high pressure, allowing the The compressed gas enters the gas storage chamber 11 from the outside through the gas flow path 13'. In the closed state (as shown in Fig. 13), the first barrier member 32' closes the intake hole 312', and blocks the gas storage chamber 11 from communicating with the outside, and gas does not flow into the gas storage chamber 11.

Referring to Figures 12, 13, and 15, the second barrier member 42' is movable relative to the second fixture 41' between an exhausted state and a closed state. In the exhaust state (as shown in FIG. 15), the internal pressure of the gas storage chamber 11 is greater than the pre-pressure value, and the second barrier member 42' is separated from the air outlet hole 322' by the internal pressure, and the gas storage is performed. The chamber 11 is in communication with the outside, allowing gas to flow out from the gas storage chamber 11 through the gas flow passage 13', the air outlet 322', the passage 324' and the air inlet hole 312'. In the closed state (as shown in FIG. 13), the internal pressure of the gas storage chamber 11 is not greater than the pre-pressure value, the second barrier member 42' closes the air outlet hole 322', and blocks the gas storage chamber 11 In communication with the outside, the gas does not flow out of the gas storage chamber 11.

Referring to Fig. 11, in the second preferred embodiment, the first elastic member 33' and the second elastic member 43' are a spring, and the second barrier member 42' is a sphere, but is not limited thereto.

Referring to FIG. 12 and FIG. 13 , the power nailing tool 10 retains the pre-pressure value in the air storage chamber 11 of the body 1 under a normal condition, and the air-filling check valve 3 ′ and the row of the valve member unit 2 ′ The gas check valves 4' are all maintained in their respective closed states.

Referring to FIG. 14 and referring to FIG. 12, in the case where the pressure in the air storage chamber 11 is lower than the preload value, the external high pressure is connected outside the body 1 to supplement the compression of the high pressure greater than the preload value. The gas, the first barrier member 32' is pushed away from the air inlet hole 312' by the high pressure, so that the air supply check valve 3' is in the plenum state, and the exhaust check valve 4' is maintained. The closed state allows the compressed gas to enter the gas storage chamber 11 through the gas flow passage 13' to increase the pressure to the preload value.

Referring to FIG. 15, and referring to FIG. 12, when the compressed gas is filled so that the internal pressure is greater than the preload value, the second blocking member 42' of the exhaust check valve 4' is pushed away by the internal pressure. The air outlet hole 322' causes the exhaust check valve 4' to be in the exhaust state, and the air supply check valve 3' maintains the closed state, allowing the compressed gas located in the gas storage chamber 11 to pass through the gas. The flow path 13' is discharged to the outside to avoid excessive pressure.

Referring to FIG. 12, after the pressure is adjusted, the pressure in the air reservoir 11 is maintained at the preload value, and the air check valve 3' and the exhaust check valve 4' are both maintained in their respective closed states. The gas storage chamber 11 is separated from the outside to prevent gas from flowing, and the compressed gas can be continuously stored in the gas storage chamber 11 The pressure in the air reservoir 11 of the body 1 is maintained at the preload value, and the power hammering tool 10 can be operated under the normal condition.

Therefore, the second preferred embodiment can achieve the effect that the first preferred embodiment achieves. Further, referring to FIG. 7 and FIG. 13, the second preferred embodiment reverses the qi. The valve 3' is integrated with the exhaust check valve 4', which can reduce the cost, and only needs to open a gas flow path 13' for the valve unit 2' to be disposed, so as to avoid the need to separately open the first preferred embodiment. The gas flow path 13 is inconvenient to the air flow path 14 and, due to the reduction of the flow path arrangement, the airtight state of the air storage chamber 11 (see FIG. 12) is more ensured, and the power nailing tool 10 is reduced. influences.

Through the above description, the advantages of the present invention can be summarized as follows:

1. The present invention allows the user to replenish the compressed gas by the setting of the valve unit 2, 2' in time when the internal pressure is insufficient, so that the pressure in the gas storage chamber 11 of the body 1 is maintained at the preload. The value is convenient for the user to continue operating the power nailing tool 10.

2. The novel uses the exhaust gas check valve 4, 4' of the valve member unit 2, 2' to automatically discharge the compressed gas when the pressure in the gas storage chamber 11 is too high, so as to avoid damage of the compressed gas of excessive high pressure. The power hammering tool 10 is used to extend the service life.

3. The present invention is disposed on the power nailing tool 10, which is convenient for the user to adjust the pressure in the air storage chamber 11 without specifically returning the entire power nailing tool 10 to the manufacturer for maintenance.

Fourth, the present invention uses a general compressed gas to be stored in the body 1 The special gas, which is not easy to obtain, can increase the convenience of repairing the power nailing tool 10.

In summary, the present invention enables the power nailing tool 10 to replenish the compressed gas in time when the pressure is insufficient to operate smoothly, so as to facilitate the user to operate the power nailing tool 10, so that the present invention can be achieved. The purpose of the new type.

However, the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made in accordance with the scope of the present patent application and the contents of the patent specification, All remain within the scope of this new patent.

10‧‧‧Power Stud Tool

1‧‧‧ Ontology

13‧‧‧ gas flow path

14‧‧‧Airflow

2‧‧‧Valve unit

3‧‧‧ qi check valve

31‧‧‧Fixed parts

32‧‧‧Resistance

33‧‧‧Flexible parts

4‧‧‧Exhaust check valve

41‧‧‧Fixed parts

42‧‧‧Resistance

43‧‧‧Flexible parts

Claims (17)

A gas pressure maintaining device suitable for a power hammering tool, and comprising: a body comprising a gas storage chamber and an air chamber defined by the inner surface and communicating with each other, and a piston housed in the air chamber, Storing a gas in the gas storage chamber and maintaining a preload value; and a valve member unit, wherein the gas storage chamber is installed on the body and connected to the outside, and externally connected to a high pressure corresponding to the preload value, allowing The gas enters the gas storage chamber from the outside, and in addition, in the case where the internal pressure in the gas storage chamber is greater than the preload value, the gas is allowed to be discharged from the gas storage chamber. The gas pressure maintaining device according to claim 1, wherein the valve member unit includes an air supply check valve that allows gas to enter the gas storage chamber from the outside when the high pressure is externally connected, and a storage valve The exhaust gas check valve that allows gas to be discharged from the gas storage chamber when the internal pressure in the gas chamber is greater than the preload value. The gas pressure maintaining device of claim 2, wherein the body further comprises a gas flow path and an air flow path respectively connecting the gas storage chamber and the outside, and the gas flow check valve is disposed on the gas flow of the body The exhaust check valve is disposed on the air flow passage of the body. The gas pressure maintaining device of claim 3, wherein the gas flow path has a large aperture section and a small aperture section, the supplemental gas check valve is located in the large aperture section, and has a surrounding defining an air inlet aperture a hollow ring portion, a blocking member, and an elastic member respectively abutting the body and the blocking member, The elastic member constantly generates an elastic restoring force to push the blocking member toward the air inlet hole, and the blocking member is movable relative to the ring portion between a plenum state and a closed state. In the qi state, the barrier member Separating from the air inlet hole by the high pressure, the gas storage chamber is connected to the outside, allowing gas to enter the gas storage chamber through the gas flow path. In the closed state, the blocking member closes the air inlet hole. And blocking the gas storage chamber from communicating with the outside, the gas does not flow into the gas storage chamber. The gas pressure maintaining device of claim 4, wherein the supplemental gas check valve further has a hollow fixing member, the fixing member having a peripheral wall portion formed at an edge of the peripheral wall portion adjacent to the outside, The peripheral wall portion defines a chamber around the ring portion, and the barrier member and the elastic member are received in the chamber. The gas pressure maintaining device of claim 3, wherein the outlet air passage has a large aperture section, a small aperture section, and an air outlet formed between the large aperture section and the small aperture section, the exhaust reverse The stop valve is located in the large aperture section and has a hollow ring portion, a blocking member, and an elastic member respectively abutting against the ring portion and the blocking member, the elastic member constantly generating an elastic restoring force to push the blocking member toward the The air outlet, the blocking member is movable relative to the ring portion between an exhaust state and a closed state. In the exhaust state, the blocking member is separated from the air outlet by the internal pressure, and the air storage chamber is The external phase is connected to allow gas to flow from the gas storage chamber to the outside through the air flow passage. In the closed state, the blocking member closes the air outlet and blocks the air storage chamber from communicating with the outside, and the gas is not affected by the air storage chamber. Flow out. The gas pressure maintaining device according to claim 6, wherein the exhaust gas is reversed The check valve further has a hollow fixing member, the fixing member has a peripheral wall portion formed on an edge of the peripheral wall portion adjacent to the outside, the peripheral wall portion and the ring portion surrounding define a chamber, the blocking member and the blocking member The elastic member is housed in the chamber. The gas pressure holding device of claim 2, wherein the body further comprises a gas flow path connecting the gas storage chamber and the outside, the gas supply check valve and the exhaust gas check valve are respectively disposed on the body Gas flow path. The gas pressure maintaining device of claim 8, wherein the gas flow path has a large aperture section and a small aperture section, the supplemental gas check valve is located in the large aperture section, and has a surrounding defining an air inlet aperture a hollow ring portion, a first blocking member, and a first elastic member respectively abutting the body and the first blocking member, the first elastic member constantly generating an elastic restoring force to push the first blocking member toward the The air inlet hole, the first blocking member is movable relative to the ring portion between a plenum state and a closed state, and in the qi state, the first blocking member is separated from the air inlet hole by the high pressure pressure. The gas storage chamber is connected to the outside, and allows gas to enter the gas storage chamber through the gas flow path. In the closed state, the first barrier member closes the air inlet hole and blocks the gas storage chamber from communicating with the outside air. The gas does not flow into the gas storage chamber. The gas pressure maintaining device according to claim 9, wherein the air supply check valve further has a hollow first fixing member, the first fixing member has a peripheral wall portion, and the ring portion is formed on the peripheral wall portion adjacent to the outside The first edge of the peripheral wall portion and the ring portion define a first chamber, and the first barrier member and the first elastic member are received in the first chamber. The gas pressure maintaining device according to claim 10, wherein the gas is supplied The first blocking member of the check valve has a rim disposed on the outer wall surface for the first elastic member to abut. The gas pressure maintaining device of claim 11, wherein the first barrier member of the supplemental gas check valve further has a large aperture portion, a small aperture portion surrounding an air outlet, and a large aperture portion And the small aperture portion surrounds the defined passage, the exhaust check valve is received in the passage, and has a hollow second fixing member, a second blocking member located at the large aperture portion, and a top against the first a second fixing member and a second elastic member of the second blocking member, the second elastic member constantly generating an elastic restoring force to push the second blocking member toward the air outlet, the second blocking member being fixable relative to the second fixing member The piece moves between an exhaust state and a closed state. In the exhaust state, the second block is separated from the air outlet by the internal pressure, and the gas storage chamber communicates with the outside to allow gas to be stored by the gas. The chamber flows out to the outside through the gas flow path, and in the closed state, the second blocking member closes the air outlet and blocks the air chamber from communicating with the outside, and the gas does not flow out from the air storage chamber. The gas pressure maintaining device of claim 1, wherein the body further comprises a piston recovery device and an electric power device, and the piston recovery device drives the piston to be reset by the electric power device. The gas pressure holding device according to any one of claims 4 to 7, wherein the elastic member is a spring. The gas pressure holding device according to any one of claims 4 to 7, wherein the barrier member is a sphere. The gas pressure maintaining device according to any one of claims 9 to 11, Wherein, the first elastic member is a spring. The gas pressure holding device of claim 12, wherein the second elastic member is a spring, and the second blocking member is a sphere.