CN201391500Y - Air pressure rod - Google Patents

Abstract

The utility model discloses an air pressure rod, which comprises an external pipe and an internal pipe unit which is inserted into the external pipe. The internal pipe unit comprises a plurality of convex parts bonded on the inner circumference of the external pipe, and a plurality of air current channels respectively arranged between two adjacent convex parts; and therefore, the structural reliability of the internal pipe unit can be strengthened, and air can be discharged from the outer circumference of the internal pipe through the air current channels, thereby preventing the air current channels from deforming due to oversize pressure, and at the time of chilling shrink, preventing the sealing function from failing after the internal pipe unit deforms. In addition, the air current channels are arranged outside the pipe body of the internal pipe unit along the circumference, and therefore, the pipe body can be formed one time so that the moulding speed is high and the productivity effect can be improved.

Description

Pressure rod

Technical field

The utility model relates to a kind of pressure rod, and it is fast particularly to relate to a kind of shaping speed, and can promote the pressure rod of productivity effect.

Background technique

Consult Fig. 1, for TaiWan, China is announced shown in M302649 number disclosed pressure rod 1 of novel patent, this pressure rod 1 comprises interior pipes 12, that an outer tube 11, is located in this outer tube 11 can manage the leakproof unit 14 that the piston unit 13, that carries out axially reciprocating in 12 is located at these outer tube 11 bottoms in this, and one is arranged at the control valve 15 of managing 12 tops in this.

Should in pipe 12 comprise two ends be the body 121 of open shape, by the upwardly extending operating member in these body 121 bottoms 122, by extending downwards and connect the interconnecting part 124 of this operating member 122 and this holding part 123 and two flow channels 125 that are arranged in this body 121 in these body 121 tops for the holding part 123, of these control valve 15 bearings.Each flow channel 125 all has first through hole 126 that is communicated with this interconnecting part 124, and second through hole 127 that is communicated with this operating member 122.

Wherein, should interior pipe 12 be made by plastic materials, produce when the course of working and grind inequality or scratch so as to improving metallic material, cause gas in interior pipe 12, to leak easily and the shortcoming of build-up of pressure in can't active set, moreover, metallic material must be controlled and be promoted for precision in course of working, to reach the requirement with outer tube 11 driving fits.

This piston unit 13 comprises that one can manage 12 operating member 122 axially reciprocatings and pass the piston rod 131 of these outer tube 11 bottoms in this, and a piston 132 of being located on this piston rod 131.This piston 132 is divided into first space 128 of contiguous this interconnecting part 124 with operating member 122, and one with this first space 128 separately and be communicated with second space 129 of described second through hole 127.

This leakproof unit 14 is located at these outer tube 11 bottoms and is resisted against pipe 12 bottoms in this, and comprise that one abuts against in this outer tube 11 inner peripheral surfaces and the leakproof ring seat 141 of sealing this two flow channel 125, and one is located at these outer tube 11 bottoms and is resisted against the end block 142 of this leakproof ring seat 141.

This control valve 15 comprises that one is positioned at the bolt rod 151 of this interconnecting part 124, and a top-pressure part 152 of being located on this bolt rod 151.

After the top-pressure part 152 of this control valve 15 promotes this bolt rod 151, make this bolt rod 151 be subjected to entering this first space 128 after the different variation in pressure, and gas moves so that pressure reaches balance in this first space 128 and second space 129 in this first space 128 and second space 129 back and forth via this two flow channel 125 under the pushing of pressure.

Aforesaid design, pipe 12 has following shortcoming in this and make, and suddenly waits to improve:

1, interior pipe 12 structures of plastic materials a little less than, easy deformation and corrupted: it is made by plastic materials that TaiWan, China is announced the M302649 number interior pipe 12 shown in the novel patent, adding the shortcoming that inequality or generation scratch take place to grind man-hour easily though overcome metallic material, but only be suitable for the low situation of pressure, when pressure is higher, but easily because gas is when this two flow channel 125 flows back and forth, be subjected to moment a large amount of gases and import the result of this two flow channel 125, adding flow channel 125 is to manage in being located in 12, because of interior pipe 12 local tube wall attenuation, cause flow channel 125 to bear uneven pressure, and the interior pipe 12 that makes contiguous this two flow channel 125 causes under exerting pressure and breaks or chap, make that pipe 12 produces distortion and cracks in this, thereby cause gas to leak outside and lose due function.

2, the interior pipe 12 of plastic materials is when shrinkage deformation, be difficult for performance sealing function: because pipe 12 is plastic materialss in being somebody's turn to do, though its drip-preventing function can be brought into play in pipe 12 and leakproof unit 14 at room temperature being somebody's turn to do, but can be under low temperature environment because the physical phenomenon of expanding with heat and contract with cold, and make in this pipe 12 and leakproof unit 14 that the situation of contraction is arranged, cause the leakproof ring seat 141 of this leakproof unit 14 and should interiorly manage 12 bottoms taking place to become flexible, cause gas to leak outside and can't reach effective leak proof seal effect, the compressing generation deformation of pipe 12 tube walls in the flow channel 125 of pipe 12 then is subjected in being somebody's turn to do, cause air-flow can't pass through flow channel 125 smoothly, and then make the functional decline of pressure rod 1.

3, manufacture process is miscellaneous: because the forming method of pipe 12 is to be inserted with earlier the barred body (scheming not show) that two desires form flow channel 125 on mould in being somebody's turn to do, after irritating mold forming, again this two barred body is extracted out, to form this two flow channel 125, but this forming method can be subject to the design form of this flow channel 125, and must carry out secondary operations, manufacture process is complicated and shaping speed is slow, so cost is higher.

Summary of the invention

The purpose of this utility model provides and a kind ofly can increase the service life and make simple pressure rod.

Pressure rod of the present utility model, comprise outer tube, that two ends are open shape and be located at interior pipe unit, in this outer tube and be located at the leakproof unit that the piston unit, in pipe unit in this is located at pipe unit bottom in this, and one is located at the control valve on pipe unit in this.Should have a upper tube body by interior pipe unit, one is arranged in the lower tube body of this upper tube body below, reaching a connection is somebody's turn to do, the interconnecting part of lower tube body, this upper tube body inside is formed with the holding part of a hollow, this lower tube body inside is formed with the operating member of a hollow, and this lower tube body has a tube wall, a plurality of protuberances that protrude at interval by this tube wall, a plurality of flow channels between per two adjacent protuberances respectively, at least one is formed at this lower tube body and corresponding first through hole that is communicated with described flow channel and interconnecting part, and at least one is formed at this lower tube body and corresponding second through hole that is communicated with described flow channel and operating member.

This piston unit comprises that one can be in this axially moves back and forth in operating member of the lower tube body of pipe unit and the piston rod of an end of this outer tube that stretched through, an and piston of being located on this piston rod, this piston is distinguished first space of contiguous this interconnecting part with this operating member, and one isolates and be communicated with second space of this second through hole mutually with this first space.This leakproof unit is located in this outer tube and is placed pipe unit below in this, communicates with the external world in order to seal this second space and obstruct.This control valve is to stretch through this outer tube in contrast to an end of this piston rod, and extends in this interconnecting part via the holding part of pipe unit in this, in order to sealing and be communicated with first space of this interconnecting part and this operating member.

The beneficial effects of the utility model are: utilize a plurality of flow channels between per two adjacent protuberances respectively, make the pipe thickness unanimity of pipe unit in this and improve structure stability, also avoid simultaneously flow channel to bear too very much not middle pressure and deform, moreover, because flow channel is to be periphery outside body, but therefore once-through on making, not only molding speed is fast, and can promote productivity effect.

Description of drawings

Fig. 1 is a side cutaway view, illustrates that TaiWan, China announces the composite construction of the pressure rod of M302649 number novel patent.

Fig. 2 is a side cutaway view, and the composite construction of first preferred embodiment of the utility model pressure rod is described.

Fig. 3 is a three-dimensional exploded view, and the protuberance and the flow channel that are somebody's turn to do interior pipe unit of this first preferred embodiment is described, and this leakproof unit.

Fig. 4 is a plan view, and the protuberance that is somebody's turn to do interior pipe unit of this first preferred embodiment and the form of flow channel are described.

Fig. 5 is a part sectioned view, and the assembling morphology of the leakproof unit of this first preferred embodiment is described.

Fig. 6 is a part sectioned view, and the bolt rod of control valve that this first preferred embodiment is described is to the form of bottom offset.

Fig. 7 is a three-dimensional exploded view, and the interior pipe unit of second preferred embodiment of the utility model pressure rod is described.

Fig. 8 is a sectional drawing, and the combination form of this second preferred embodiment is described.

Fig. 9 is a three-dimensional exploded view, and the form of protuberance, flow channel and the secondary channels setting of the utility model the 3rd preferred embodiment is described.

Figure 10 is a part sectioned view, illustrates that the cross section of the protuberance of the utility model the 4th preferred embodiment is a semicircular in shape.

Figure 11 is a part sectioned view, and the cross section that the protuberance of the utility model the 5th preferred embodiment is described is to be the narrow shape of the wide top margin in base.

Embodiment

Below in conjunction with drawings and Examples the utility model is elaborated: before the utility model is described in detail, be noted that in the following description content that similar elements is to represent with identical numbering.

Consult Fig. 2, first preferred embodiment of the utility model pressure rod 2 comprises outer tube 3, that two ends are open shape to be located at interior pipe units 4, in this outer tube 3 and to be located at the leakproof unit 6 that piston units 5, in pipe unit 4 in this are located at pipe unit 4 bottoms in this, and one is located at the control valve 7 on pipe unit 4 in this.

Fig. 3 and Fig. 4 are consulted in collocation, should have a upper tube body 41 by interior pipe unit 4, one is arranged in the lower tube body 42 of these upper tube body 41 belows, reach the interconnecting part 43 of this upper tube body 41 of a connection and lower tube body 42, these upper tube body 41 inside are formed with the holding part 411 of a hollow, these lower tube body 42 inside are formed with the operating member 421 of a hollow, and this lower tube body 42 has a tube wall 422,12 protuberances 423 that protrude at interval by this tube wall 422,12 flow channels 424 between per two adjacent protuberances 423 respectively, four first through holes 425 that are formed at this lower tube body 42 and described flow channel 424 of corresponding connection and interconnecting part 43 reach four and are formed at this lower tube body 42 and corresponding second through hole 426 (only showing two among Fig. 3) that is communicated with described flow channel 424 and operating member 421.Moreover as shown in Figure 3, described first through hole 425 is to be formed on the end face of this upper tube body 41 of vicinity of this lower tube body 42, and described second through hole 426 is to be formed on the other end of this lower tube body 42.

In the present embodiment, Fig. 4 shows 423,12 flow channels 424 of whole 12 protuberances, and four first through holes 425, and the quantity of described flow channel 424 and protuberance 423 is to cooperatively interact, the quantity of described first through hole 425 and second through hole 426 also can not need cooperatively interact, and is then unrestricted as for the collocation quantity of the described flow channel 424 and first through hole 425.

Consult Fig. 2 and Fig. 3, should in pipe unit 4 comprise that also one is formed and formed and second groove 45, two of contiguous this lower tube body 42 is located on seal ring 46 in this first groove 44 and this second groove 45 respectively by these upper tube body 41 outer circumferential face ring-types corresponding to first groove 44 of this holding part 411, by these upper tube body 41 outer circumferential face ring-types, reaching one, to be located at this second groove 45 interior and in order to fixing first pad 47 of sealing ring 46.

In the present embodiment, the material of sealing ring 46 is a rubber, its Cross section Design is shaped as O shape ring, also can be X-shaped ring or D shape ring, and the form of this Cross section Design also can be made of other shapes, be to be sheathed in this first groove 44 in the present embodiment, and X-shaped seal ring 46 is sheathed in this second groove 45 with O V-shaped ring 46.

Consult Fig. 2, this piston unit 5 comprises that one moves axially in the operating member 421 of pipe unit 4 and the piston rod 51 of an end of this outer tube 3 that stretched through in this, an and piston 52 of being located on this piston rod 51, this piston 52 is distinguished first space 53 of contiguous this interconnecting part 43 with this operating member 421, and one isolates and be communicated with second space 54 of this second through hole 426 mutually with this first space 53.

Consult Fig. 2, Fig. 3 and Fig. 5, this leakproof unit 6 comprises the oil sealing of being located in this outer tube 61, one is arranged in the ring set spare 62 on this oil sealing 61, and one be arranged in this oil sealing 61 times and replace the oil sealing base 63 of these outer tube 3 inner peripheral surfaces, and this oil sealing 61 has one second pad 611, one along the prominent section 612 of the outer shroud of this second pad, 611 outer periphery setting, reach one along the prominent section 613 of the interior ring of these second pad, 612 inner circumference edge diagonally extendings, the prominent section 613 of ring defines an axis hole 614 that supplies this piston rod 51 to wear in being somebody's turn to do, this second pad 611 is iron plates, by this second pad can this oil sealing 61 of reinforcement intensity, reach the effect of sealing this second space 54.

This control valve 7 comprises that one stretched through this outer tube 3 in contrast to an end of this piston rod 51 and be positioned at the top-pressure part 71 of the holding part 411 of this pipe unit 4, one extends to bolt rod 72 in this interconnecting part 43 by this top-pressure part 71, and two baffle ring 721 that is located on this bolt rod 72,722, this bolt rod 72 is to abut against in this operating member 421 tops, as as shown in Figure 2, it is the connected relation of under closed state, closing this operating member 421 and this interconnecting part 43, and move up and down by this bolt rod 72, and open and close the connected relation in described first through hole 425 and this first space 53, and this two baffle ring 721, the 722nd, respectively under closed state, with described first through hole 425 and 53 sealings of this first space.

Consult Fig. 2 and Fig. 6, when this pressure rod 2 from the closed state shown in Fig. 2, after bestowing air pressure with 71 pairs of these bolt rods 72 of this top-pressure part, this bolt rod 72 just drops in this first space 53 (as shown in Figure 6), this interconnecting part 43 is connected with this operating member 421, with this first space 53 relation that is communicated with is arranged and form this first through hole 425, and present described first through hole 425, flow channel 424, and second through hole, 426 formation connected states, therefore, when gas enters this first space 53, promote this piston 52 and drive this piston rod 51 to descend to this second space 54, and make gas pass described second through hole 426 with all pressing, enter in all flow channels 424, and flow to this first through hole 425 and get back in first space 53 of this interconnecting part 43 and this operating member 421, this piston rod 51 can be moved down uniformly, and when 71 pairs of these bolt rods 72 of top-pressure part were exerted pressure, this bolt rod 72 was promptly kept in the center, and by this two baffle ring 721,722 close the passage 425 and first space 53 respectively.

In the process, in order to prevent that piston rod 51 is when dropping to these 54 bottoms, second space, this piston rod 51 is subjected to excessive bump, so be located on around this piston rod 51 with this ring set spare 62, and below this oil sealing 61, oil sealing base 63 is set, when making these piston rod 51 rise and fall, avoid excessive compression oil sealing 61, moreover, the O V-shaped ring 46 of utilization shown in Fig. 2 top is located near in first groove 44 of this holding part 411, and the X-shaped seal ring 46 shown in Fig. 2 below is located near in second groove 45 of this interconnecting part 43, so can further prevent gas pipe unit 4 and 3 leakages of outer tube in this.The function that first pad 47 is set for 46 times at this X-shaped seal ring then is for sealing ring 46 being fixed in this second groove 45, avoiding landing when assembling.

Aforesaid design has following advantage:

1. interior pipe unit 4 is to dredge the formula design, replace the sealed mode design, structural strength is good: consult Fig. 1, than technology shown in Figure 1, gas is that the sealed mode flow channel 125 at interior pipe 12 flows, add flow channel 125 can make in the pipe 12 in being located in pipe 12 tube wall attenuation, and make this flow channel 125 when each action, all must bear great air pressure, cause overall structure to descend, make flow channel 125 produce crack and corrupted.Review, the utility model is the method that adopts the formula of dredging, utilize a plurality of protuberance 423 and a plurality of flow channels 424 between per two adjacent protuberances 423 respectively that protrude at interval by the tube wall 422 of interior pipe unit 4, make this tube wall 422 consistency of thickness, so improve the structure stability of pipe unit 4 in this, moreover, flow channel 424 in gas imports this between pipe unit 4 and the outer tube 3, gas evenly and is dispersedly flowed in the described flow channel 424, and make in this pipe unit 4 outer circumferential face pressurizeds average, so as to offsetting the air pressure in this operating member 421, so can avoid flow channel 424 to bear too big gas pressure, and cause pipe unit 4 explosions in this.

2. the advantage that has anti-low temperature to shrink: as shown in Figure 3, should interior pipe unit 4 be to adopt two-piece design, again because described flow channel 424 is designs of adopting the formula of dredging, gas can fluidly be shuttled back and forth in this between the pipe unit 4 and outer tube 3, therefore do not need the described flow channel of forced seal 424 ends, make the gas can be by pipe unit in this 4 and 62 mediations of this ring set spare, avoid as existing pressure rod 1 under the low excessively environment of temperature, should interiorly manage 12 because of dimensional contraction, and form the slit with this leakproof ring seat 141, cause sealing and to reduce allomeric function.

3. manufacture process is simple: because described flow channel 424 is to be surrounded on the outer circumferential face of pipe unit 4 in this, so only needing in the manufacturing of mould has concaveconvex shape accordingly at mould inner wall, carry out one-time formed manufacture method again, so can avoid making the trouble on the described flow channel 424, and then accelerate the speed of production of pipe unit 4 in this, and save manufacture cost.

Consult Fig. 7, Fig. 8, second preferred embodiment of pressure rod of the present utility model, be identical with this first preferred embodiment haply, place wherein inequality is: described protuberance 423 of the lower tube body 42 of pipe unit 4 and flow channel 424 are the axis shape arrangements in the shape of a spiral along this lower tube body 42 in this.

By described flow channel 424 spiral designs, make spiral-shaped that gas can be along flow channel 424, and more smooth moving up and down, so avoid pressure directly to the impact of described flow channel 424, and pipe unit 4 tube walls 422 corrupted that breaks in causing.

Consult Fig. 9, collocation Fig. 2, the 3rd preferred embodiment of pressure rod of the present utility model, be identical haply with this first preferred embodiment, place wherein inequality is: this lower tube body 42 comprises that also a plurality of and described protuberance 423 and flow channel 424 are 90 °, and vertically be formed at the lower tube body 42 of pipe unit 4 in this tube wall 422 peripheries and secondary channels 427.

And the design by described secondary channels 427 can avoid having barometric pressure to produce when a large amount of gases directly pour described flow channel 424, and causes that described flow channel 424 of pipe unit 4 must bear excessive air pressure in this.The design of described secondary channels 427 is when allowing gas pass through described flow channel 424, the gas of small part can be imported in each secondary channels 427, alleviating the impact of barometric pressure to described flow channel 424, and the effect with buffering.

Consult Figure 10 and the Fig. 2 that arranges in pairs or groups, the 4th preferred embodiment of pressure rod 2 of the present utility model, be identical haply with this first preferred embodiment, place wherein inequality is: protuberance 423 of the lower tube body 42 of pipe unit 4 is lower tube body 42 outer circumferential faces that are located on pipe unit 4 in this in this, and is resisted against on the inner peripheral surface of this outer tube 3.

Because pipe unit 4 is the modes to dredge in being somebody's turn to do, gas is circulated in this operating member 421 with in the described flow channel 424, therefore by this semicircular design, in the time of can making gas stream cross described flow channel 424, described protuberance 423 peripheries that are subjected to rectangular shape in the time of can not making gas flow are interfered, and make this protuberance 423 under permanent the use and damage, just have further to allow the gas mobile meaning flow channel 424 in swimmingly.

Consult Figure 11 and the Fig. 2 that arranges in pairs or groups, the 5th preferred embodiment of pressure rod 2 of the present utility model, be identical haply with this first preferred embodiment, place wherein inequality is: cross section of lower tube body 42 protuberances 423 of pipe unit 4 is to be the form that the base is wide and top margin is narrow in this, and is located on lower tube body 42 outer circumferential faces of pipe unit 4 in this.

As the 4th preferred embodiment, gas can be flowed smoothly at described flow channel 424, provide another kind of embodiment at this.

In sum, the utility model in design, utilize a plurality of protuberance 423 and a plurality of flow channels 424 between per two adjacent protuberances 423 respectively that protrude at interval by the tube wall 422 of pipe unit in this 4, make the consistency of thickness of pipe unit 4 tube walls 422 in this, improve the structure stability of pipe unit 4 in this, and utilize described flow channel 424 that gas can be dredged on pipe unit 4 outer circumferential faces in this, avoid described flow channel 424 to bear too big pressure and deform, in the time of also can avoiding shrinkage, can't bring into play the function of mediation air pressure after described flow channel 424 distortion, moreover, because described flow channel 424 is to be periphery outside the lower tube body 42 of in this pipe unit 4, but not in body 41, therefore making when being shaped, molding is quick and can promote productivity effect, so can reach the purpose of this utility model really.

Claims (13)

1, a kind of pressure rod, comprise: two ends are the outer tube of open shape, an interior pipe unit of being located in this outer tube, the piston unit that can in this, axially move back and forth in the pipe unit, the leakproof unit being located in the outer tube and placing pipe unit below in this, and control valve, should comprise a upper tube body by interior pipe unit, a lower tube body that is arranged in this upper tube body below, and a connection is somebody's turn to do, the interconnecting part of lower tube body, this upper tube body inside is formed with the holding part of a hollow, this lower tube body inside is formed with the operating member of a hollow, this piston unit comprises that one axially moves back and forth and the piston rod of an end of this outer tube that stretched through in the operating member of this lower tube body, and piston of being located on this piston rod, this piston is distinguished this operating member in first space of this interconnecting part of vicinity, and one isolated and be communicated with second space of this second through hole mutually with this first space, this leakproof unit is to be located in this outer tube and to place pipe unit below in this, in order to seal this second space and to intercept with the external world, this control valve is that this outer tube that stretched through extends in this interconnecting part in contrast to an end of this piston rod and via the holding part of pipe unit in this, in order to seal and to be communicated with first space of this interconnecting part and this operating member, it is characterized in that:

This lower tube body has a tube wall, a plurality of protuberance that is protruded at interval by this tube wall, a plurality of flow channel between per two adjacent protuberances respectively, at least one is formed at this lower tube body and corresponding first through hole that is communicated with described flow channel and interconnecting part, and at least one is formed at second through hole of this lower tube body and corresponding described flow channel of connection and operating member.

2, pressure rod as claimed in claim 1, it is characterized in that: this leakproof unit comprises that being located at oil sealing in this outer tube, one for one is arranged on this oil sealing and seals the ring set spare in this second space, reaching one is arranged under this oil sealing and the oil sealing base of this outer tube inner peripheral surface of contact, and this oil sealing has one second pad, the prominent section of outer shroud that is provided with along these second pad outer periphery, and the prominent section of the interior ring along this second pad inner circumference edge diagonally extending, prominent segment limit of ring is made the axis hole that this piston rod of confession wears in this.

3, pressure rod as claimed in claim 2 is characterized in that: this of this lower tube body first through hole is to be formed on the end face of this upper tube body of vicinity of this lower tube body, and this second through hole is to be formed on the other end away from this upper tube body of this lower tube body.

4, pressure rod as claimed in claim 3, it is characterized in that: this control valve comprises that this outer tube that stretched through extends to the bolt rod of this interconnecting part in contrast to end of this piston rod and the top-pressure part, that is positioned at the holding part of this pipe unit by this top-pressure part, and two baffle ring that is located on this bolt rod, this bolt rod is to abut against in this operating member top, in order to open and close the connected relation of this operating member and this interconnecting part, this two baffle ring is respectively in order to open and close the connected relation in described first through hole and this first space.

5, pressure rod as claimed in claim 4 is characterized in that: the protuberance of this lower tube body and flow channel are all corresponding to this operating member.

6, pressure rod as claimed in claim 5 is characterized in that: the protuberance of this lower tube body and flow channel are all corresponding to this interconnecting part.

7, pressure rod as claimed in claim 6 is characterized in that: the described flow channel of this lower tube body is the axis shape arrangement in the shape of a spiral along this lower tube body.

8, pressure rod as claimed in claim 6 is characterized in that: this lower tube body comprises that also a plurality of and described protuberance and flow channel are the secondary channels that an angle is formed at the tube wall outer circumferential face of this lower tube body.

9, pressure rod as claimed in claim 8 is characterized in that: described secondary channels of pipe unit is 90 degree with the angle that corresponding flow channel forms in this.

10, pressure rod as claimed in claim 9, it is characterized in that: pipe unit comprises that also one is formed by this upper tube body outer circumferential face ring-type and formed by this upper tube body outer circumferential face ring-type and second groove, two seal rings that are located on respectively in this first groove and this second groove of contiguous this lower tube body corresponding to first groove of this holding part, one in this, and reaching one, to be located at this first groove interior and in order to fixing first pad of sealing ring.

11, pressure rod as claimed in claim 10 is characterized in that: the cross section of the protuberance of this lower tube body is quadrilateral.

12, pressure rod as claimed in claim 10 is characterized in that: the cross section semicircular in shape shape of the protuberance of this lower tube body.

13, pressure rod as claimed in claim 9 is characterized in that: the cross section of the protuberance of this lower tube body is the narrow form of the wide top margin in base.

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