KR101084024B1 - Pressure adjusting apparatus - Google Patents

Abstract

assignment

Provided is a pressure regulating device capable of omitting a dedicated back pressure passage, which has conventionally been necessary for introducing a pressure after pressure in a pressure regulator chamber of a pressure regulator into the back pressure chamber.

Solution

The pressure regulator 20 is a structure which introduces the fuel after pressure adjustment into the back pressure chamber 41 in the pressure regulation chamber 40 of the pressure regulator 22, and interconnects the fuel passage 100 via the pressure regulator 22. FIG. A first casing 24 and a second casing 26 are formed. While the pressure regulator 22 is mounted between both casings 24 and 26, the fuel passage 100 communicates with the pressure control chamber 40 and the back pressure chamber 41. The flange portion 38 of the pressure regulator 22 is sandwiched between the two casings 24 and 26 via the wave washer 90.

Pressure regulator

Description

Pressure regulating device {PRESSURE ADJUSTING APPARATUS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure regulating device having a configuration in which a fluid (mainly fuel) after pressure is introduced into a pressure regulator chamber of a pressure regulator in a pressure regulator chamber of a pressure regulator.

In order to stabilize the pressure regulation value of the pressure regulator and to improve the durability of the diaphragm, there is a configuration in which fuel after pressure is introduced into the pressure regulator back pressure chamber of the pressure regulator (for example, a patent document). 1). 12 is a block diagram which shows the fuel supply apparatus of a prior art example (patent document 1).

As shown in FIG. 12, the pressure regulator chamber of the pressure regulator 6 is located in the middle of the return passage 5 which branches from the fuel supply line 3 from the fuel pump 2 to the injection valve 4 and reaches the fuel tank 1. (6a) is in communication. The pressure regulator 6 is provided with a back pressure passage 7 for introducing the fuel after the pressure adjustment in the pressure regulator chamber 6a into the back pressure chamber 6b.

[Patent Document 1] Japanese Unexamined Patent Publication No. 2004-164153

In the fuel supply apparatus of the said conventional example, it was necessary to form the exclusive back pressure passage 7 for introducing the fuel after pressure adjustment to the back pressure chamber 6b in the pressure regulator chamber 6a of the pressure regulator 6. As shown in FIG.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pressure regulating device capable of omitting a dedicated back pressure passage, which has been conventionally required for introducing a fluid after pressure in a pressure regulator chamber of a pressure regulator into the back pressure chamber.

The said subject can be solved by the pressure regulating apparatus which makes a summary the structure described in the claim column of this invention.

That is, according to the pressure regulating device according to the present invention, the pressure regulator is mounted between the two members, and the fluid passage formed by the interconnection of the two members communicates with the pressure regulator chamber and the back pressure chamber of the pressure regulator. Therefore, the exclusive back pressure passage conventionally required in order to introduce the fluid after pressure adjustment into the back pressure chamber in the pressure regulator chamber of the pressure regulator can be omitted.

Further, according to the pressure adjusting device according to the present invention, since the flange portion of the pressure regulator is sandwiched between two members via an elastic member, the pressure regulator can be easily prevented or reduced.

EMBODIMENT OF THE INVENTION Below, the best form for implementing this invention is demonstrated using drawing.

Example

An embodiment of the present invention will be described based on the drawings. The pressure regulator of this embodiment is used for the fuel supply apparatus of the vehicle LPG engine which uses liquefied petroleum gas (LPG) as a fuel. For convenience of explanation, the pressure regulating device will be described after explaining the outline of the fuel supply device.

The outline of a fuel supply apparatus is demonstrated. 1 is a block diagram which shows a fuel supply apparatus.

As shown in FIG. 1, the fuel supply apparatus 10 is equipped with the fuel tank 11 which stores fuel LPG in a liquid state. The electric fuel pump 12 formed in the fuel tank 11 sucks the fuel in the liquid state stored in the fuel tank 11 and discharges it to the fuel supply passage 13 at high pressure. The fuel supply passage 13 is in communication with a delivery pipe 14 formed on the engine side. The delivery pipe 14 is connected to an injection valve (so-called injector) 15 for injecting fuel in a liquid state corresponding to each cylinder of the LPG engine (not shown). In addition, the delivery pipe 14 and the fuel tank 11 communicate with each other via the return passage 16. In addition, a pressure regulator 22 located on the engine side is formed in the middle of the return passage 16. The pressure regulator 22 adjusts the fuel pressure (continuous pressure) supplied to the injection valve 15 to predetermined pressure. In this pressure regulator 22, surplus fuel so-called return fuel is returned to the fuel tank 11 through the return passage 16. In addition, a return fuel is equivalent to the "fluid path via a pressure regulator" as used in this specification. In addition, the member which forms the upstream (delivery pipe 14 side) passage by the pressure regulator 22 in the return passage 16 is called the upstream piping member 16a, and the downstream side (fuel tank) The member which forms the passage of (11) side is called downstream piping member 16b.

The fuel supply passage 13 is provided with a shutoff valve 17 for a feed fuel, and the return fuel shutoff valve 18 is formed in the return passage 16. Both shutoff valves 17 and 18 each consist of an electronic on-off valve, and are controlled to be ON and OFF based on a control signal output from an electronic controller (referred to as "ECU") 19. have. The ECU 19 stops the fuel supply by closing both shutoff valves 17 and 18 when the engine is stopped, and also supplies fuel by opening both shutoff valves 17 and 18 at the start and operation of the engine. To make it possible.

Next, the pressure regulator provided with the said pressure regulator 22 is demonstrated. In addition, FIG. 2 is a front view which shows a pressure regulator, FIG. 3 is a side view similarly, FIG. 4 is a top view similarly, FIG. 5 is a side sectional view similarly, and FIG.

As shown in FIG. 5, the pressure regulating device 20 is positioned above the pressure regulator 22 and the first casing 24 positioned above and connected to each other with the pressure regulator 22 interposed therebetween. A second casing 26 is provided (see FIG. 6). Hereinafter, for convenience of explanation, the pressure regulator 22, the 1st casing 24, and the 2nd casing 26 are demonstrated in order, and these assembly procedures are demonstrated. In addition, the 1st casing 24 and the 2nd casing 26 correspond to "two members" as used herein.

The pressure regulator 22 is demonstrated. 7 is sectional drawing which shows a pressure regulator.

As shown in FIG. 7, the pressure regulator 22 is provided with the housing 30 which comprises a hollow cylindrical shape. The housing 30 is comprised by the cup-shaped lower shell 31 which opens an upper surface, and the inverted cup upper shell 32 which opens a lower surface. The upper shell 32 has the normal part 32a of a predetermined outer diameter, and the upper plate part 32b which closes the upper surface of the said normal part 32a. The lower end part of the normal part 32a becomes the bulging part 32c which enlarges an outer diameter. The lower end part of the expanded part 32c is provided with the junction part 32d which protrudes on a flange toward radial direction outer side. In addition, the communication port 33 is opened in the ordinary portion 32a of the upper shell 32.

The lower shell 31 has a normal portion 31a having a predetermined outer diameter and a lower plate portion 31b for closing the lower surface of the normal portion 31a. The inlet port 34 is opened in the lower plate part 31b. Moreover, the annular groove part 35 recessed in the radial direction inward is formed in the lower end part of the normal part 31a. Moreover, the recessed part 36 recessed in the radial direction inner side is formed in the center part of the up-down direction of the normal part 31a. The outlet 37 is opened in the center of the recess 36. Moreover, the upper end part of the normal part 31a becomes the bulging part 31c which enlarges an outer diameter. On the upper end of the expanded portion 31c, the upper shell 32 is projected from the flange toward the radially outer side and overlapped with the joint 32d of the upper shell 32, and the upper shell 32 from the outer circumferential portion of the joint 31d. A caulking portion 31e is caulked in a shape that is folded back so as to overlap on the joint portion 32d of the c). Thus, the joining part 31d, 32d and the caulking part 31e which overlap with each other by caulking form the flange part 38 which protrudes on the outer peripheral surface of the housing 30. As shown in FIG. In addition, the outer peripheral portion of the diaphragm 39 is sandwiched between the joint portions 31d and 32d of the two shells 31 and 32. Thereby, the diaphragm 39 divides the internal space of the housing 30 into the pressure control chamber 40 located below and the back pressure chamber 41 located above. In addition, the back pressure chamber 41 communicates with the communication port 33.

The valve seat member 43 is arranged in the lower shell 31. The pressure control chamber 40 is partitioned into two chambers up and down by the valve seat member 43. The outer side surface of the valve seat member 43 is provided with a contact groove 44 for communicating the upper and lower chambers. Further, an L-shaped contact hole 46 is formed in the central portion of the valve seat member 43, the opening of which is on the upper surface, and the bottom of which communicates with the side, that is, the outlet 37. The cylindrical valve seat 47 is mounted in the upper opening of the contact hole 46. In addition, the lower chamber of the pressure adjusting chamber 40 communicates with the inlet 34.

The holding member 50 disposed below the diaphragm 39 and the spring support sheet 51 disposed above the diaphragm 39 are supported in the joined state by caulking. In the recess formed in the lower surface side center part of the holding member 50, the ball 53 which has the valve plate 52 which can be seated on the said valve seat 47 in the lower side is fitted. The outer circumferential portion of the ball 53 is prevented from being pulled out by the stopper plate 54 cocked by the holding member 50. In this way, the valve plate 52 is supported by the holding member 50 so as to be able to swing.

In the back pressure chamber 41, a spring 55 is attached between the upper plate portion 32b of the upper shell 32 and the spring support sheet 51. The spring 55 always elastically supports the spring support seat 51, the holding member 50, and the like downward, and seats the valve plate 52 on the valve seat 47. When the valve plate 52 is seated on the valve seat 47 and closed, the pressure control chamber 40 and the communication hole 46 are blocked. In addition, the valve plate 52 opens away from the valve seat 47 so that the pressure regulator chamber 40 and the communication hole 46 communicate with each other. In addition, an O-ring 57 is attached to the annular groove portion 35 of the lower shell 31 by utilizing its elasticity.

Next, the first casing 24 will be described. 8 is a plan view showing the first casing, and FIG. 9 is a cross-sectional view taken along the line VII-VII arrow of FIG. 8.

As shown in FIG. 6, the 1st casing 24 is an elbow-shaped piping member, and has the passage part 60 which opens to the lower side (right side in FIG. 6), and opens to an upper surface. As shown in FIG. 2, a flanged pipe connecting portion 61 is formed around the opening of the passage portion 60 on the lower side of the first casing 24. The downstream end part of the upstream piping member 16a in the said return passage 16 (refer FIG. 1) is connected to the piping connection part 61 by fastening. Moreover, the pair of stud bolts 62 for fastening are formed in the outer end part of the piping connection part 61 (refer FIG. 2 and FIG. 3).

As shown in FIG. 6, the flange-shaped connection part 65 is formed around the opening part of the passage part 60 in the upper side of the said 1st casing 24 (refer FIG. 8 and FIG. 9). The connecting portion 81 of the second casing 26 (to be described later) is fastened to the connecting portion 65. A proper number of fastening female screw holes 66 are formed in the connecting portion 65 at equal intervals in the circumferential direction.

As shown in FIG. 9, the lower shell 31 of the pressure regulator 22 (refer FIG. 7) can be fitted in the opening part of the passage part 60 in the upper side of the said 1st casing 24. FIG. A fitting hole 67 is formed. The fitting hole portion 67 is a small diameter hole portion 67a that can fit the lower portion of the ordinary portion 31a of the lower shell 31 and a large diameter hole that can fit the expansion portion 31c of the lower shell 31. The part 67b and the stepped hole part 67c which can be fitted in the shape which loosened the flange part 38 of the pressure regulator 22 are provided (refer FIG. 8). Further, on the upper inner circumferential surface of the large diameter hole portion 67b, an appropriate number of semicircular communication recesses 68 are formed at equal intervals in the circumferential direction. The communication concave portion 68 is formed to be able to communicate with the annular space portion 92 (to be described later) while the upper surface side is opened on the bottom face (lower surface) of the stepped hole portion 67c. The outer end of the communication recess 68 has reached the inner circumferential surface of the stepped hole 67c. In addition, a ring-shaped groove 69 is formed on the upper surface of the junction portion 65 concentrically with the stepped hole portion 67c and surrounds the stepped hole portion 67c at a predetermined interval. An O-ring 70 is attached to this ring-shaped groove 69 (see FIG. 6).

As shown in FIG. 2, the mounting part 73 which protrudes to both left and right sides is formed in the lower front surface side of the said 1st casing 24. As shown in FIG. The attaching part 73 is fastened to the fixed side member (for example, an intake manifold) which is not shown in figure. The mounting portion 73 is formed with a bolt insertion hole 74 for fastening.

Next, the second casing 26 will be described. FIG. 10 is a bottom view showing the second casing, and FIG. 11 is a cross-sectional view taken along the line XI-XI in FIG. 10.

As shown in FIG. 6, the 2nd casing 26 is an elbow-shaped piping member, and has the channel part 80 which opens to a lower surface and opens to the upper side surface (right side in FIG. 6). A flange-shaped connecting portion 81 is formed around the opening of the passage portion 80 on the lower side of the second casing 26. The connecting portion 65 of the first casing 24 is fastened to the connecting portion 81. The connection part 81 is provided with each screw insertion through-hole 82 corresponding to each female screw hole 66 (refer FIG. 8) of the connection part 65 of the said 1st casing 24 (refer FIG. 10). In addition, the upper surface of the first casing 24 and the lower surface of the second casing 26 are joined surfaces that can be joined to each other in a surface contact shape.

As shown in FIG. 11, in the opening part of the passage part 80 in the lower side of the said 2nd casing 26, the expanded part 32c of the upper shell 32 of the pressure regulator 22 (refer FIG. 7). The fitting hole part 83 which can fit the normal part 32a containing this in the loosely fitted shape is formed. Each communication recess 84 corresponding to each communication recess 68 (see FIG. 8) of the first casing 24 is formed on the inner peripheral surface of the lower end of the fitting hole 83. The communication recessed part 84 is formed so that communication with the annular space part 97 (to be described later) is possible, while the lower surface side thereof is opened at the lower end face of the second casing 26.

As shown in FIG. 6, the flange-shaped piping connection part 85 is formed in the circumference | surroundings of the opening part of the passage part 80 in the upper side of the said 2nd casing 26. As shown in FIG. The upstream end of the downstream piping member 16b in the said return passage 16 (refer FIG. 1) is connected to the piping connection part 85 by fastening. Moreover, the pair of stud bolts 86 for fastening are formed in the outer end part of the piping connection part 85 (refer FIG. 2 and FIG. 3).

As shown in FIG. 6, when the pressure regulator 22 (see FIG. 7) is mounted between the casings 24 and 26, the flange portion 38 of the pressure regulator 22 (see FIG. 7) is mounted. An appropriate number of waves (two in this embodiment) is provided for the wave washers 90 that can be mounted on the substrate. The wave washer 90 is formed in a round ring shape that can be fitted to the expansion portion 32c of the upper shell 32 of the pressure regulator 22. In addition, the wave washer 90 is corresponded to the "elastic member" mentioned in this specification.

Next, the assembly procedure of the pressure regulator 22, the 1st casing 24, and the 2nd casing 26 is demonstrated.

(1) In FIG. 6, the lower shell 31 of the pressure regulator 22 is fitted into the fitting hole 67 of the first casing 24. At this time, the O-ring 57 previously mounted on the lower shell 31 of the pressure regulator 22 is elastic to the lower inner peripheral surface of the small diameter hole portion 67a (see FIG. 6) of the fitting hole portion 67. The contact between the first casing 24 and the lower shell 31 is sealed. Moreover, while the lower part of the normal part 31a of the lower shell 31 is fitted in the upper part of the small diameter hole part 67a of the fitting hole part 67, the large diameter hole part of the fitting hole part 67 ( The expansion part 31c of the lower shell 31 is fitted to the upper end of 67b). In addition, the flange portion 38 of the pressure regulator 22 is fitted into the stepped hole portion 67c in a loosely fitted shape. Thereby, the annular space part 92 which communicates with the outlet 37 between the lower inner peripheral surface of the large diameter hole part 67b of the fitting hole 67, and the upper outer peripheral surface of the normal part 31a of the lower shell 31 is made. Formed (see FIG. 5). This annular space portion 92 communicates with the space portion 93 between the stepped hole portion 67c and the flange portion 38 via each communication recess 68. Also, the inlet 34 of the lower shell 31 communicates with the passage portion 60 in the first casing 24.

(2) Next, two wave washers 90 are fitted on the flange portion 38 by being fitted to the upper shell 32 of the pressure regulator 22. In addition, the both wave washers 90 can be easily disposed on the flange portion 38 by fitting to the upper shell 32.

(3) Next, the fitting hole 83 of the second casing 26 is mounted with respect to the upper shell 32 of the pressure regulator 22 (in detail, the ordinary portion 32a including the expanded portion 32c). Fit in loose shape. In this state, both casings 24 and 26 are connected by binding the screw 95 to the female threaded hole 66 of the first casing 24 through the screw insertion hole 82 of the second casing 26. (See Figure 5). In connection with this, between the joint surfaces of both casings 24 and 26 is elastically sealed by the O-ring 70. As shown in FIG. In addition, the wave washer 90 is compressed using elasticity by the joining surface of the second casing 26, so that the flange portion 38 of the pressure regulator 22 is formed between the two casings 24, 26 by the wave washer ( 80) is elastically sandwiched through. In addition, the respective communication recesses 84 of the second casing 26 are matched with the communication recesses 68 of the first casing 24, respectively, so that the two communication recesses 68, 84 communicate with each other. . Moreover, it communicates with the communication port 33 between the inner peripheral surface of the fitting hole part 83 of the 2nd casing 26, and the outer peripheral surface of the normal part 32a (including the expanded part 32c) of the upper shell 32. An annular space 97 is formed. The annular space 97 communicates with the space 93 in the first casing 24 via each communication recess 84 of the second casing 26, and the second casing 26. It communicates with the passage part 80 inside. Accordingly, the passage portion 60 of the first casing 24 communicated with the pressure regulator chamber 40 of the pressure regulator 22 and the second casing 26 communicated with the back pressure chamber 41 of the pressure regulator 22. Passage portion 80 is communicated as a series of fuel passages (100). In this way, the pressure regulator 20 in which the pressure regulator 22 was inlined with respect to the fuel passage 100 is completed (refer FIG. 2-FIG. 4).

In addition, the pressure adjusting device 20 is fastened to the mounting portion 73 of the first casing 24 by a fixed side member (for example, an intake manifold). In addition, the upstream piping member 16a of the return passage 16 (refer FIG. 1) is connected to the piping connection part 61 of the 1st casing 24 by fastening. In addition, the upstream end of the downstream piping member 16b of the return passage 16 (refer FIG. 1) is connected to the piping connection part 85 of the 2nd casing 26 by fastening.

In the pressure regulator 20, the valve plate 52 of the pressure regulator 22 (refer FIG. 7) is currently closed. The fuel flowing in the upstream piping member 16a of the return passage 16 (refer FIG. 1) in this state is the inlet port of the pressure regulator 22 via the passage part 60 in the 1st casing 24. By introducing into the pressure control chamber 40 from 34, the soft pressure in the pressure control chamber 40 becomes high. Then, when the pressure in the pressure chamber 40 is greater than the force in the back pressure chamber 41 with respect to the diaphragm 39 (the combined force of the elastic force of the spring 55 and the pressure of the return fuel acting in the back pressure chamber 41). The valve plate 52 is opened with the diaphragm 39 being displaced to the back pressure chamber 41 side, that is, upward. Therefore, the fuel in the pressure control chamber 40 flows out to the annular space 92 through the outlet 37 as surplus fuel, that is, return fuel. In addition, a return fuel corresponds to "fuel (fluid) after pressure regulation in a pressure control chamber" as used in this specification.

The return fuel passes from the annular space 92 to each communication recess 68, through the space 93, each communication recess 84 in the second casing 26, the annular space 97, It flows into the downstream piping member 16b of the return passage 16 (refer FIG. 1) via the passage part 80, and finally returns to the fuel tank 11. As shown in FIG. At this time, a part of the return fuel flowing through the annular space 97 in the second casing 26 is introduced into the back pressure chamber 41 through the communication port 33. For this reason, the pressure of return fuel acts in the back pressure chamber 41.

In addition, with the outflow of the return fuel from the pressure control chamber 40, the soft pressure in the pressure control chamber 40 is lowered. And when the soft pressure in the pressure control chamber 40 becomes smaller than the force in the back pressure chamber 41 with respect to the diaphragm 39, the diaphragm 39 will displace to the pressure control chamber 40 side, ie, downward, and a valve | bulb By closing the plate 52, the outflow of fuel in the pressure control chamber 40 is restricted. In this way, the pressure in the pressure chamber 40 is maintained at a predetermined value.

In addition, the return fuel after pressure adjustment is introduced into the back pressure chamber 41 in the pressure regulator chamber 40 of the pressure regulator 22, and the pressure regulator chamber 40 is applied in accordance with the force in the back pressure chamber 41 including the pressure of the return fuel. By adjusting the soft pressure of, it is possible to stabilize the roughness value of fuel such as LPG whose soft pressure changes with temperature and to improve the durability of the diaphragm 39.

According to the pressure adjusting device 20 described above, the pressure regulator 22 is mounted between the first casing 24 and the second casing 26, and the two casings 24 and 26 are interconnected. The fuel passage 100 formed is in communication with the pressure regulator chamber 40 and the back pressure chamber 41 of the pressure regulator 22. Therefore, the exclusive back pressure passage conventionally required in order to introduce the fuel after pressure adjustment to the back pressure chamber 41 in the pressure regulator chamber 40 of the pressure regulator 22 can be omitted.

In addition, since the flange portion 38 of the pressure regulator 22 is sandwiched between the first casing 24 and the second casing 26 through the wave washer 90, the pressure regulator 22 is slack. Can be easily prevented or reduced.

The present invention is not limited to the above embodiments, but modifications can be made without departing from the spirit of the present invention. For example, in the above embodiment, the LPG is regulated. However, the fluid to be regulated is not limited to LPG, but may also be applied to fuel for engines such as gasoline or diesel, water, air, hydraulic oil, and the like. Can be. In addition, the passage part 60 of the 1st casing 24 and / or the passage part 80 of the 2nd casing 26 is not limited to an elbow shape, You may form in a straight form. Moreover, the number of the communication recesses of each casing can also be increased or decreased suitably. In addition, what is necessary is just to form the wave washer 90 as needed, and you may abbreviate | omit. Instead of the wave washer 90, a dish spring, a coil spring, a rubbery elastomer, or the like may be used as the elastic member.

1 is a block diagram showing a fuel supply device according to an embodiment of the present invention.

2 is a front view illustrating the pressure adjusting device.

3 is a side view illustrating the pressure adjusting device.

4 is a plan view of the pressure adjusting device.

5 is a side sectional view showing a pressure regulating device.

It is a side sectional view which decomposes | disassembles a pressure regulator.

7 is a cross-sectional view illustrating the pressure regulator.

8 is a plan view of the first casing.

9 is a cross-sectional view taken along the line VII-VII arrow of FIG. 8.

10 is a bottom view of the second casing.

FIG. 11 is a cross-sectional view taken along the line XI-XI of FIG. 10.

It is a block diagram which shows the fuel supply apparatus of a conventional example.

Explanation of the sign

20 pressure regulating device

22 pressure regulator

24 1st casing (member)

26 2nd casing (member)

38 Flange

40 pressure chamber

41 back pressure chamber

90 wave washer (elastic member)

100 fuel passages (fluid passages)

Claims (4)

As a pressure regulator of the configuration which introduces the fluid after pressure into the back pressure chamber in the pressure regulator chamber of the pressure regulator, Two members for forming a fluid passage through the pressure regulator by interconnection, The pressure regulator is mounted between the two members, and the fluid passage is configured to communicate with the pressure control chamber and the back pressure chamber. And the pressure regulator is disposed between the two members and disposed in the fluid passage, and the pressure after the pressure is introduced into the back pressure chamber in the fluid passage. The method of claim 1, And a mechanism (opening and closing valve) for communicating and blocking the pressure regulator chamber and the back pressure chamber in the pressure regulator. The method of claim 2, And the actuating valve acts as a pressure regulating valve for adjusting fluid pressure. The method according to any one of claims 1 to 3, And the flange portion of the pressure regulator is sandwiched between the two members via an elastic member.

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