JPS6376901A - Hydraulic booster for different kinds of fluid - Google Patents

Abstract

PURPOSE:To perform sealing simply and securely by leading the same kind of fluid as that in a chamber faced to the big diameter portion of a pressure intensifying piston into a chamber between the small diameter end of said piston and a partitioning piston, while leading a different kind of fluid from that stated above into a chamber faced to the other end surface of the partitioning piston. CONSTITUTION:A hydraulic booster 1 for different kinds of fluid pressurizes a different kind of fluid from that from a pressure source 4 and the fluid from the pressure source 3 is controlled by a two position selector valve 2. In this case, together with forming two chambers 12, 13 which face to both end surfaces of the big diameter portion 8 of a pressure intensifying piston 7 respectively, two chambers 14, 15 and two stepped chambers 18, 19 are formed facing to the end surfaces of small diameter portions 10, 11 on the booster body 6. And still, in the stepped chambers 18, 19, respective partitioning pistons 22, 23 with seal rings 20, 21 on respective periphery are engaged freely slidable for parting to respective chambers 14, 18 or to respective chambers 15, 19. And the pressure source 3 is connected to the chamber 12 in the booster 1 and the chamber 13 is connected to a tank 43. Again, the chamber 13 in the booster 1 is connected to a line 41 and the chamber 12 is connected to a line 40.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a pressure increaser piston with a large diameter (m) consisting of a large diameter part and a small diameter part. The present invention relates to a dissimilar fluid pressure intensifier that increases the pressure of a fluid in a chamber facing the end surface of the small diameter section based on a pressure receiving area difference between the end surface of the diameter section and the end surface of the small diameter section.

<Prior Art> Different fluid pressure intensifiers are now often used as pressure sources in water jet cutting machines. In this case, the working pressure is 40
Since the pressure is as high as 0.000 atmospheres, reliable sealing means is required as a means for sealing between the different fluids in the different fluid pressure intensifier.

Conventionally, there is a sealing means for a fluid pressure intensifier as shown in Fig. 2 (Japanese Patent Publication No. 55-6790).
. This sealing means has a sealing chamber 10 at the boundary between the small diameter portion 101 of the plunger 114 in the fluid pressure intensifier 100 and the cylinder 102 that slidably fits the small diameter portion 101.
4, and in order from the high pressure chamber 103 side of this packing chamber 104, a rigid top adapter 1051 and an elastic ring 106 are installed.
゜A packing 107 having a notch 107a on its outer periphery.A backup ring 108 having a higher yield strength than the packing 107 and a rigid bottom adapter 109 are sequentially fitted and fixed in the packing chamber 104 with a gland nut 110. I have to.

The fluid pressure intensifier 100 equipped with the sealing means has a low pressure chamber 112 on the end surface 111a of the large diameter portion 111 of the plunger 114.
Due to the pressure of the fluid inside, the large diameter section I11 moves to the right, pressurizing the fluid within the high pressure chamber 103 at the end face of the small diameter section lot, and the large diameter section 21 and the small diameter section 101 receive pressure. Increase the pressure according to the area ratio. At that time, the small diameter portion 101
The increased pressure fluid leaking along the surface of the small diameter portion 101 from the high pressure chamber 103 to the low pressure chamber 113 due to the sliding movement is sealed by the sealing means fitted and fixed in the packing chamber 104.

<Problems to be Solved by the Invention> However, in the conventional fluid pressure intensifier described above, especially in the case of a dissimilar fluid pressure intensifier in which the pressure increase source fluid and the pressurized fluid are different, the high pressure fluid sealing means is It is very complex and therefore costly. Further, due to poor reliability, there is a problem that, during long-term use, the high pressure fluid in the high pressure chamber 103 leaks into the low pressure chamber 113 and mixes with different types of low pressure fluid.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pressure booster for dissimilar fluids that is highly reliable and durable for long-term use, which can reliably seal dissimilar fluids using a simple sealing means.

<Means for Solving the Problems> In order to achieve the above object, the dissimilar fluid pressure intensifier of the present invention integrates a pressure intensifying piston consisting of a large diameter part and a small diameter part into a housing and slidably fits the same. In a pressure intensifier that applies fluid pressure to the end face of the large diameter part and increases the fluid pressure in the chamber on the end face side of the small diameter part due to the area difference between the end face of the large diameter part and the end face of the small diameter part. , the chamber facing the end face of the small diameter part is 2
A partition piston having a seal on the outer periphery is provided, and a fluid of the same kind as that in the chamber facing the end surface of the large diameter portion is provided in the chamber between the end surface of the small diameter portion and one end surface of the partition piston. It is characterized in that a fluid is introduced into the chamber on the other end surface side of the partition piston, and a fluid different from the above fluid is introduced into the chamber on the other end surface side of the partition piston.

<Function> When fluid pressure is applied to the end face of the large diameter part of the pressure intensifying piston of a different fluid pressure intensifier and it moves in one direction within the housing, the small diameter part moves in the same direction within the housing, causing the partition piston to move in the same direction. The fluid guided into the chamber formed between one end face of the large diameter part and the end face of the small diameter part is pressurized, and the pressure is increased according to the pressure receiving area ratio of the end face of the large diameter part and the end face of the small diameter part. be done.

This fluid is the same type as the fluid on the end face side of the large diameter portion.

Further, the pressure of the increased fluid is increased to a high pressure by being transmitted via the partition piston to a fluid of a different type than the adult body led to the chamber on the other end side of the partition piston. A heterogeneous fluid is obtained. That is,
Since the fluid pressures of two adjacent chambers into which different types of fluids are introduced are the same, the different types of fluids do not mix even with a simple sealing means.

<Example> Hereinafter, this invention will be explained in detail with reference to the drawings.

In FIG. 1, 1 is a different fluid pressure intensifier that pressurizes a fluid different from that from the pressure source 4, and 2 is a fluid from the pressure horn source 3 that is supplied to the different fluid pressure intensifier 1. ,
This is a two-position switching valve that performs switching control. Reference numeral 6 denotes a main body into which a pressure increasing piston 7 is slidably fitted, and the pressure increasing piston 7 has an integral structure consisting of a large diameter portion 8 and a small diameter portion 10.2. The main body 6 has the pressure increasing piston 7.
A chamber 12.13 facing both end faces of the large diameter part 8 is formed, and a stepped chamber consisting of a chamber 14.18 or 15.19 is further formed facing the end face of the small diameter part 10.2. There is. Furthermore, partition pistons 22.23 each having a seal 20.21 around the periphery are slidably provided in the chambers 18.19 of the stepped chamber facing the end face of the small diameter portion 10.11 of the pressure boosting piston 7. by fitting into chamber 14 and chamber 18 or chamber 15.
and room 19. Both ends 6a of the main body 6.

6a, an end face member 30.31 having holes 26, 27, 28, 29 for supplying and discharging bodies from the pressure source 4 into and out of the chambers 18, 19 is tightly fixed, and the chambers 18, 19 are closed. It's sealed.

The limit switches 34 and 35 that open and close the current to the solenoid that switches the symbol position of the two-position switching valve 2 are as follows:
Chambers 12 facing both end surfaces of the large diameter portion 8 of the pressure boosting piston 7
．． It is turned on and off by means of a bottle 36, 37 which passes through the main body 6 and retracts from the main body 13 with its l end always protruding.

The above-mentioned different fluid pressure intensifier 1, 2-position switching valve 2 and pressure source 3.4
and connect as follows. The pressure source 3 is line 39
, connected to the chamber 12 of the foreign fluid pressure intensifier 1 via the two-position switching valve 2 and line 40, while the chamber 13 is connected to the tank 43 via the line 41.2-position switching valve 2 and line 42. There is. Further, the chamber I4 of the different fluid pressure intensifier I is provided with a check valve 44 that allows free flow to this chamber 14.
The chamber 15 is connected to the line 41 via a line 46 which connects the chamber 15 to the line 41 via a line 47 which has a check valve 45 allowing free flow to this chamber 15.
Connected to 0.

Furthermore, the pressure source 4 is connected to the hole 26 of the end member 30 via a line 59 and a line 52 having a check valve 50 allowing free flow from the pressure source 4; said end member 3 via a line 53 having a check valve to allow free flow from the pressure source 4;
It is connected to the hole 28 of No. 1. Further, the hole 27 of the end member 30 is connected to the line 58 via a line 56 having a check valve 54 that allows free flow from this hole 27, and similarly the hole 29 of the end member 31 is connected to the line 58. Line 5 with check valve 55 to allow flow from hole 29 to be free flow
7 to the above line 58.

The different fluid pressure intensifier configured as described above operates as follows.

The pressure intensifying piston 7 of the different fluid pressure intensifier 1 moves to the left in the figure, and the inclined surface 8a of the large diameter part 8 pushes in one end protruding into the chamber 12 of the bottle 3G, thereby pushing the limit switch. 34 is turned on, and the 2-position switching valve 2 is moved to the symbol position V.
Current flows through the solenoid that switches to l, and the symbol position switches to vl.

When the two-position switching valve 2 is switched to the symbol position VI,
Fluid supplied from the pressure source 3 is supplied to the chamber 1 of the different fluid pressure intensifier l via the line 39, the two-position switching valve 2 and the line 40.
2 and transmits pressure to one end of the large diameter portion 8 of the pressure booster piston 7 to move the pressure booster piston 7 to the right in the figure. and discharge via line 12 to tank 43. Then, as the pressure increase piston 7 moves to the right, the chamber 1
5 is pressurized by the end face of the small diameter section 11 of the pressure boosting piston 7, and the ratio of the pressure receiving area of the large diameter section 8 to the pressure receiving area of the small diameter section 11, that is, the ratio of the pressure receiving area of the large diameter section 8, is increased. If the diameter is DI and the diameter of the small diameter part lO・11 is ri, then (
D, "-D2")/D2". Further, the pressure of the fluid in the increased pressure chamber 15 is checked from the pressure source 4 via the partition piston 23. It is transmitted to the different type of fluid, that is, water, supplied into the work chamber 19 through the line 53 and the pipe 9R connecting the valve 51.In other words, the oil supplied from the pressure source 3 is Due to body pressure, the large diameter part 8 and the small diameter part 1 of the piston 7
The pressure of the dissimilar fluid, water, supplied from the pressure source 4 in the chamber 19 is increased through the homogeneous fluid, ie, oil, in the 1° chamber 15 and the partition piston 23 . At the same time, the pressure booster piston 7 moves to the right, causing the chamber 14 to become under negative pressure.
Therefore, the suction force causes the partition piston 22 to move to the right, and the chamber 18 also becomes in a negative pressure state.
2 and through hole 26.

Next, the piston 7 moves to the right, and the inclined surface 8b of the large diameter portion 8 protrudes into the chamber 13 of the bottle 37.
By pushing in the end, the limit switch 35 is turned on, and at the same time the electric current flows through the solenoid that switches the two-position switching valve 2 to the symbol position ■2, the limit switch 34 is turned off, and the symbol position is V2. Switch to .

When the two-position switching valve 2 is switched so that the symbol position is at v2, the fluid supplied from the pressure source 3 flows into the chamber 13 of the different fluid pressure intensifier 1, and the pressure intensifier piston 7 is moved to the left in the figure. At the same time, the fluid in the chamber 12 is discharged into the tank 43, and the fluid sealed in the chamber 14 is pressurized by the end surface of the small diameter portion 10 of the pressure intensifying piston 7 to obtain the pressure intensifying ratio (D, "-Dt'
)/Dt'. The increased pressure of the fluid in the chamber 14 is transmitted via the partition piston 22 to water, which is a different fluid, supplied from the pressure source 4 into the chamber 18 . In other words, the pressure of the fluid (ura) supplied from the pressure source 3 causes the large diameter portion 8 of the pressure increasing piston 70 to increase. Small diameter part IO1
A homogeneous fluid (oil) in the chamber 14 and a dissimilar fluid (oil) supplied from the pressure source 4 in the chamber 18 via the partition piston 22
water). At the same time, the pressure boosting piston 7 moves to the left, so that the chamber 15 becomes under a negative pressure state, and the pressure source 4 supplies a different type of fluid to the chamber 19, which has become under a negative pressure state.

The pressurized fluid in the chamber 18 or 19 obtained by the method described above is transferred to the line 5 having the check valve 54.
6 or a check valve 55 via lines 57 and 58 to a pond fluid system, not shown.

Furthermore, when the different fluid pressure intensifier 1 is in operation and the small diameter portion 10° 11 of the pressure intensifier piston 7 slides from side to side in the figure, for example, if the piston slides to the left, the above A very small amount of the high pressure fluid in the chamber 14 passes through the contact surface 10a and Ila between the small diameter portion 10° 11 and the main body 6 to the low pressure side chamber 12, or the fluid in the low pressure side chamber 13 is in a very small negative pressure state. may leak into the chamber 15. However, since the fluid in the chamber 12.13 and the fluid in the chamber 14.15 are the same type of fluid (oil) supplied from the pressure source 3, there is no problem of mixing different fluids. Moreover, the partition piston 22.
Although the fluids on both sides of 23 are different fluids, the fluid pressures on both sides are the same and are not increased, so there is little possibility of leakage, and a simple seal 20° 21 is sufficient. In other words, the structure is such that once the pressure of the same type of fluid (oil) as the pressure source is increased, the obtained high fluid pressure is transmitted to the different type of fluid (water) via the partition pistons 22 and 23. There is no pressure difference between different types of fluids, and even if the seals 20 and 21 between different types of fluids are extremely simple, a sufficient sealing effect can be obtained. In addition, the lack of fluid in the chamber 14.15 due to the leakage of fluid in the chamber 14.15 described above can be caused by the pressure source 3 in the line 39. 2-position switching valve located at symbol position ■1 2. Line 4 with line 40 and check valve 45
7 to the chamber 15, or similarly from the pressure source 3 to the line 39. Two-position switching valve located at symbol position V2. The chamber 14 is supplied via a line 41 and a line 46 with a check valve 44.

In the above embodiment, limit switches 34 and 35 are used as switching means for the two-position switching valve 2, but
Other means may also be used.

Further, in the above embodiment, the diameter of the chamber 14.15 and the diameter of the chamber 18.19 are different, but the same effect can be obtained even if the diameters are the same. Furthermore, on, i
Il! Room 18. +9 does not necessarily need to be provided adjacent to the chambers 14 and 15, and the above-mentioned dissimilar fluid hm "r', 'l
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19 through the partition piston 22, 23 of the hole through which the fluid supplied from the pressure source 4 is supplied and discharged, and the other side of the chamber 1.
4.15 may be connected by a line.

<Effects of the Invention> As is clear from the above, the dissimilar fluid pressure intensifier of the present invention partitions the chamber on the end surface side of the small diameter portion of the pressure intensifying piston into two chambers by providing a partition piston with a seal around the periphery. The same type of fluid as the fluid in the chamber facing the end surface of the large diameter portion is introduced into the chamber between the end surface of the small diameter portion and one end surface of the partition piston, while the fluid is introduced into the chamber on the other end surface side of the partition piston. Since the fluid and different types of fluids are introduced, the fluid pressures of the two adjacent chambers into which different types of fluids are introduced are the same, and even with simple sealing means, a sufficient sealing effect can be obtained, and leakage can be avoided. Mixing of different fluids does not occur. Therefore, it is possible to reliably seal different types of fluids using a well-known simple sealing means that can withstand long-term use.

Further, since different types of fluids are not introduced into two adjacent chambers having different internal fluid pressures, mixing of different types of fluids does not occur.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a different fluid pressure intensifier according to the present invention, and FIG. 2 is a partial sectional view of a conventional fluid pressure intensifier. l... Different fluid pressure intensifier, 6... Main body, 7... Pressure increasing piston, 8... Large diameter part, to, 11... Small diameter part, 20.21... Seal, 22.23 ...Partition piston, 30.31...End member.

Claims (1)

[Claims] (1) A pressure increasing piston consisting of a large diameter part and a small diameter part is slidably fitted into the housing, and fluid pressure is applied to the end face of the large diameter part, and the pressure increasing piston is applied to the end face of the large diameter part and the small diameter part. In a pressure intensifier that increases fluid pressure in a chamber on the end face side of a small diameter part due to an area difference with the end face of the small diameter part, the chamber facing the end face of the small diameter part is partitioned into two chambers, and a partition piston is provided with a seal on the outer periphery. a fluid of the same type as the fluid in the chamber facing the end surface of the large diameter portion is introduced into the chamber between the end surface of the small diameter portion and one end surface of the partition piston, and the same type of fluid as the fluid in the chamber facing the end surface of the large diameter portion is introduced into the chamber on the other end surface of the partition piston. ,
A different fluid pressure intensifier, characterized in that it guides a fluid different from the above fluid.