JPH055045B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention arranges distribution valves in parallel through a single main pipe, and uses a pump unit as a fluid supply source to alternately pressurize and depressurize the fluid. A depressurization-responsive distribution valve that dispenses fluid by controlling the pressure.When fluid is supplied under pressure, pressure and oil are accumulated in the distribution valve, and when the pressure is released, the fluid is released by the action of the on-off (switching) valve. The present invention relates to a depressurization-responsive post-feed distribution valve that distributes water, and also relates to a depressurization-responsive post-feed distribution valve that is suitable for use under high pressure.

(Prior Art) Conventionally, as shown in FIG. 5, a pressure-responsive post-feed distribution valve uses a piston having a discharge spring at its rear end via an umbrella-shaped opening/closing (switching) valve 52 in a main pipe passage 51. A fluid inflow passage 55 is provided which communicates with the piston chamber 54 in which the piston chamber 53 is installed, and the on-off valve 52 of the inflow passage 55 and the piston chamber 54 are provided.
A basic structure is known in which a discharge passage 56 is provided at a position between and the piston 53 and the on-off valve 52 act to perform metering and dispensing from the discharge passage 56.

When fluid is pressurized and supplied from the main pipe passage 51, the depressurization-responsive post-feed type distributing valve having this configuration closes the discharge passage 56 by the on-off valve 52 due to the pressurization (see Fig. 5). (see A), the peripheral edge 57 of the on-off valve 52 is bent inward to open the inflow passage 55.
is opened, and fluid is stored in the piston chamber 54 through the inflow passage 55 (see FIG. 5b).

Next, when the inside of the main pipe passage 51 becomes depressurized, the umbrella-shaped on-off valve 52 is opened to the inlet passage 55 by the action of the fluid pressure stored in the piston chamber 54.
The oil is moved to the inlet port 58 side to close the inflow passage 55 and open the discharge passage 56 to open the piston chamber 54 and the discharge passage 56, so that the oil stored in the piston chamber 54 is closed. The fluid flows backward through the inflow passage 55 and is dispensed from the discharge passage 56 (see Fig. 5C).
reference).

In addition, there are various configurations of the depressurization-responsive post-feed distribution valve, but the basic structure described above is the same.

Since these pressure release responsive post-feed distribution valves are configured using a discharge spring disposed at the rear end of the piston as a fluid pressure accumulating means, a constant discharge pressure can be guaranteed after pressure accumulation.

Since the difference between the initial fluid discharge pressure and the final fluid discharge pressure can be set small, it is possible to obtain conditions close to constant pressure oil supply.

Piping configuration can be simplified.

Accurate (±5 to 15%) discharge amount can be obtained.

Since it has a pressure accumulating function and is configured to discharge at static pressure, even if a constricted portion occurs in the distribution pipe or the like, the set volume of fluid can be completely discharged over time.

It has the following advantages.

(Problem to be solved by the invention) However, these depressurization responsive post-feed distribution valves,
Difference between the amount of fluid stored in the distribution valve and the amount of fluid distributed from the discharge passage (the amount of fluid stored in the part of the inflow passage that reaches the opening/closing valve and the piston chamber)
Also, when discharging the fluid stored in the piston chamber, it is necessary to reverse the flow in the inflow passage and distribute the fluid from the discharge passage. There is a problem in that the accumulated fluid remains stagnant in the distribution valve, ie, creates a fluid spot, as shown in FIG. 5 (see part a).

This is a problem with many highly viscous fluids such as grease, and as these fluids age, they deteriorate and deteriorate, and also have an adverse effect on fluids in areas where no fluid spots have occurred, and furthermore, the various types of fluids that are distributed. This has the problem of providing a cause for equipment failure.

This invention has been made in view of the above points, and allows the fluid stored in the distribution valve to pass sequentially through the discharge passage without causing fluid spots in the conventional depressurization responsive post-feed type distribution valve. The present invention provides a depressurization-responsive post-feed type distributing valve that is capable of distributing.

(Means for solving the problem) The means includes providing a fluid discharge passage in the main pipe passage through an on-off valve chamber and an inflow passage communicating with the piston chamber through a check valve chamber, respectively. The on-off valve chamber and the piston chamber are communicated through a communication passage, and the discharge passage is closed when fluid is pressurized to the main pipe passage in the on-off valve chamber, and the discharge passage is opened when the pressure is released. An on-off valve is provided for communicating the communication passage and the discharge passage, and a check valve for preventing backflow of fluid to the main pipe passage is provided in the check valve chamber, and a discharge spring is provided in the piston chamber to control the inside of the piston chamber. A sliding piston is provided, and the fluid flowing into the piston chamber from the main pipe passage through the inflow passage can be discharged and distributed from the discharge passage through the communication passage by the operation of the piston. This is the configuration of the valve.

That is, the configuration is such that a discharge passage, an inflow passage, and a communication passage are provided independently, and the discharge passage and the inflow passage communicate with the piston chamber via the communication passage.

(Operation) Next, the operation of the present invention will be explained based on the above configuration.

First, when fluid is supplied under pressure from the main pipe passage,
Push up the on-off valve and close the discharge passage to shut off the communication passage and the discharge passage (if the on-off valve has been pushed up by a spring etc. from the beginning and is blocking the discharge passage, maintain that state). ), the fluid passes through the discharge passage through the check valve and flows into the piston chamber by a set volume amount, pushing the piston against the discharge spring. Here, the presence or absence of a set volume can be determined by a signal pin.

Next, when the inside of the main pipe passage becomes depressurized, the flow of fluid into the piston chamber is stopped, and the check valve returns to its original position to prevent backflow of fluid.

Then, due to the pressure inside the distribution valve, the discharge spring starts to return and pushes the piston toward the head of the piston chamber, and the fluid accumulated in the piston chamber is sent to the on-off valve via the communication path. This fluid pressure pushes down the on-off valve to open the discharge passage, and a set volume of fluid is discharged and distributed from the discharge passage. Then, this action is repeated in sequence by the alternating operation of the pump unit, and the fluid that has flowed into the piston chamber from the inflow passage is discharged in order from the oldest to the oldest, thereby acting to prevent the formation of fluid pockets.

(Examples) Hereinafter, the present invention will be specifically described based on examples shown in the drawings.

The distribution valve of the present invention is a unit distribution valve 63 used in a distribution system as shown in FIG. 6, and as shown in FIG. Further, a fluid inflow passage 6 communicating with a piston chamber 5 via a check valve chamber 4 is disposed below the main pipe passage 1, and the piston chamber 5 is connected to the opening/closing valve chamber 2. and communication path 7
It consists of a structure arranged so as to communicate with each other.

The opening/closing valve chamber 2 is usually formed of a discharge nipple, and has a valve body 8 therein for closing the discharge passage 3, and a fluid to be pressurized and supplied to the main pipe passage 1 on the main pipe passage 1 side. A sliding body 11 has a primary pressure acting surface 9 on which the fluid discharged from the communication passage 7 acts on the discharge passage 3 side and has a secondary pressure acting surface 10 that joins the valve body 8. It is equipped with an on-off valve 12 consisting of the following. In addition, the on-off valve 1
2 is made of a hard material and is pressed toward the discharge passage 3 by a spring 31.

Here, if the on-off valve chamber 2 is formed of a discharge nipple, the engagement with the on-off valve chamber 12 can be made more reliable. In addition to the opening/closing valve 12 having a configuration that allows the discharge passage 3 to be reliably opened and closed by the fluid pressure in the main pipe passage 1, other configurations, shapes,
It may be made of a material or the like.

The check valve chamber 4 is provided with a check valve 13 therein for preventing backflow of fluid into the main pipe passage 1. Here, the check valve 13 is formed of a steel ball, is pressed by a spring 14 on the side of the main pipe passage 1, and engages with the inner circumferential wall of the check valve chamber 4 to prevent backflow of fluid as described above. acts to prevent it.

The piston chamber 5 is disposed within a cylinder 16 fitted in the distribution valve body 15, and is erected at a position intersecting the main pipe passage 1 at a right angle at a short distance with its head 17 facing downward. Note that the piston chamber 5
Although the distribution valve body 15 may be directly formed as a cylinder, it is preferable that the cylinder 16 is fitted into the distribution valve body 15.

That is, it is easy to form passages such as the inflow passage 6, and the cylinder itself can be replaced.
Therefore, it is possible to significantly change the fluid discharge amount with the same main body, and even if the distribution valve main body 15 is made of a soft material such as die-casting, the cylinder 16 itself can be made of a hard material to provide high pressure specifications. This is because it has advantages such as being able to obtain a distribution valve.

A piston 19 is disposed within the piston chamber 5, and a signal pin 21 having a flange 20 at the end 19 of the shaft 18 and a discharge spring 22 are disposed at the rear thereof. Therefore, this signal pin 21 is also arranged upward. With this configuration, operation can be easily confirmed.

Further, the end portion 23 of the cylinder 16 having the piston chamber 5 formed therein includes a spring bearing seat 24 for supporting the discharge spring 22, a shaft hole 25 for supporting the shaft 18 of the signal pin 21, and a shaft hole 25 for supporting the shaft 18 of the signal pin 21. A nut 27 is provided which has a sleeve portion 26 that threads into the cylinder 16.

The signal pin 21 has a shaft 18, a large diameter shaft 28 on the flange 20 side, and a small diameter shaft 29 on the opposite side.
, the different diameter portion 30 contacts the piston side end surface 31 of the nut 27, the small diameter shaft 29 projects outward from the cylinder 16, and the flange 20 contacts the rear end surface 31 of the front piston 19. It is disposed within the cylinder 16. Note that the signal pin 21 is not limited to this configuration and may have other configurations, but in the case of this configuration, the set volume of the fluid in the piston chamber 5 is adjusted by the screwing of the nut 27. This has the advantage that the amount of fluid discharged can be adjusted by changing the amount of fluid.

Further, the discharge spring 22 is disposed between the flange 20 serving as a spring seat and a spring bearing seat 24 of the nut 27, and the piston 19 is mounted on its head 1.
It is designed to press in seven directions.

The inflow passage 6 is connected to the head 17 of the piston chamber 5.
The piston chamber 5 and the on-off valve chamber 2 communicate with each other through a communication passage 7. In addition,
Here, the communication passage 7 and the discharge passage 3 are described as being separate, but they may be integrated. In this case, an on-off valve chamber is formed in the middle of the discharge passage 3. Further, the inflow passage 6 may communicate with a central portion or an upper portion of the piston chamber 5 depending on the case;
It may be configured such that it communicates with the head portion 17 of the head.

Further, a configuration may be adopted in which a through hole is formed between the check valve chamber 4 (or the inflow passage 6) and the communication passage 7 as necessary. In this case, even if air enters from the main pipe passage 1, it can be smoothly sent out to the communication passage 7 and the discharge passage 3 through this hole, eliminating the possibility of air stagnation inside the distribution valve body 15. can. The above explanation is based on the configuration in which the inflow passage 6 is disposed below the main pipe passage 1 via the check valve chamber 4, but other configurations, such as the opening/closing valve of the opening/closing valve chamber 2, are possible. 1
It may be arranged in front of the primary pressure acting surface 9 of No. 2. Next, the operation will be explained based on the above configuration (see Figures 1 to 4 and 6).

First, in FIG. 6, a pump unit 61 supplies fluid under pressure to each unit distribution valve 63 through a main pipe 62.

Then, in the state shown in FIG. 1, the fluid acts on the primary pressure acting surface of the on-off valve 12 disposed in the on-off valve chamber 2, pushing up the on-off valve 12 and maintaining the closed state of the discharge passage 3. do. Then, the fluid flows into the check valve chamber 4 and pushes down the check valve 13,
The discharge spring 2 passes through the inflow passage 6 and enters the piston chamber 5.
2, the piston 19 is pushed up and the set volume flows in. Here, when the set volume of oil is stored, the small diameter shaft 29 of the signal pin 21 moves to the cylinder 16.
fully protrudes outward (see Figure 2).

Next, when the main pipe passage 1 is depressurized by the pump unit 61 shown in FIG. 6, the flow of fluid into the piston chamber 5 is stopped, and the check valve 13 in the check valve chamber 4 is Returns to prevent backflow of fluid.

Then, the discharge spring 22 starts to return due to the pressure inside the distribution valve, and the piston 19 is moved into the piston chamber 5.
The fluid pressure and oil stored in the piston chamber 5 is sent into the on-off valve chamber 2 through the communication passage 7, and this fluid pressure closes the on-off valve in the on-off valve chamber 2. 12 to open the discharge passage 3 (see FIG. 3), and a set volume of fluid is discharged and distributed from the discharge passage 3.

Then, when the set volume of fluid is discharged and distributed, the on-off valve 12 in the on-off valve chamber 2 returns to close the discharge passage 3 (see FIG. 4). The alternating operation of the pump unit 61 is repeated in order to sequentially discharge the fluid that has flowed into the piston chamber 5 from the inflow passage 6, starting from the oldest fluid, thereby preventing the formation of fluid pockets.

According to the configuration of this embodiment, the fluid supply pressure can be as high as 180 kg/cm ² , so a large number of high-consistency greases can be distributed, and the discharge pressure is 70 kg/cm 2 .
High pressure of Kg/cm2 or ^more can be obtained (conventional product is 10Kg/cm2 or more)
cm ² ).

(Effects of the Invention) As is clear from the above description, according to the present invention, the fluid inflow passage and the discharge passage are completely separated. To provide a pressure-responsive post-feed type distribution valve that solves the problems that have been encountered in the past, and that does not create fluid spots within the distribution valve and allows the fluid stored in the distribution valve to be distributed sequentially through the discharge passage. I can do that.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention;
4 is a sectional view showing the operating state of the embodiment of the present invention, FIGS. 5A, B, and C are sectional views showing the operating state of the conventional example, and FIG. 6 is a system diagram using the distribution valve of the present invention. be. 1: Main pipe passage, 2: Open/close valve chamber, 3: Discharge passage,
4: Check valve chamber, 5: Piston chamber, 6: Inflow passage,
7: Communication path, 12: Open/close valve, 13: Check valve, 1
5: Distribution valve body, 16: Cylinder, 17: Head of piston chamber, 21: Signal pin, 22: Discharge spring.

Claims (1)

[Scope of Claims] 1. A fluid discharge passage is provided in the main pipe passage via an on-off valve chamber, and an inflow passage is provided which communicates with the piston chamber via a check valve chamber, and the on-off valve chamber and the piston chamber are connected to each other. are communicated through a communication passage, and the discharge passage is closed when pressurizing fluid to the main pipe passage in the opening/closing valve chamber, and the discharge passage is opened when the pressure is released, and the communication passage and the discharge passage are communicated with each other. furthermore, a check valve for preventing backflow of fluid to the main pipe passage is provided in the check valve chamber, and a piston that slides within the piston chamber by a discharge spring is provided in the piston chamber; A depressurization responsive post-feed distribution valve characterized in that fluid flowing into a piston chamber from a main pipe passage through an inflow passage can be discharged and distributed from the discharge passage through the communication passage by the operation of the piston. 2. A discharge passage is provided above the main pipe passage, an inflow passage is arranged below the main pipe passage, and the piston chamber is placed with its head lowered to a position where it intersects the main pipe passage at a close distance at a right angle. The depressurization-responsive post-feed distribution valve according to claim 1, wherein the distribution valve is erected on the side. 3. The depressurization-responsive post-feed distribution valve according to claim 1, wherein the on-off valve chamber is formed by a discharge nipple. 4. A signal pin having a flange at the end of the shaft is arranged so that the flange is in contact with the rear end of the piston, and the shaft projects outward from the distribution valve body, and the flange is connected to the discharge spring. 3. The depressurization-responsive post-feed type distributing valve according to claim 1 or 2, characterized in that the distributing valve has a spring seat for disposing the valve. 5. The depressurization responsive post-feed distribution valve according to claim 1 or 2, wherein the piston chamber is disposed within a cylinder fitted into the distribution valve body. 6. At the end of the cylinder or distribution valve body, a nut having a spring bearing seat for supporting the discharge spring, a shaft hole for supporting the shaft of the signal pin, and a sleeve portion to be threadedly engaged with the cylinder or distribution valve body. 6. The depressurization-responsive post-feed type distribution valve according to claim 4, characterized in that a pressure release responsive post-feed distribution valve is provided. 7 The shaft of the signal pin is set such that the flange side is the large diameter shaft and the opposite side is the small diameter part, and the different diameter part is in contact with the end face of the nut on the piston side, and the screw movement of the nut causes the inside of the piston chamber to 7. The depressurization-responsive post-feed distribution valve according to claim 6, wherein the discharge amount of the fluid can be adjusted by changing the set volume.