JPH05204468A - Vacuum regulator - Google Patents

Abstract

PURPOSE:To provide a vacuum regulator for a milking machine which hardly generates periodic pressure fluctuation which tends to be generated in a vacuum system supplying vacuum pressure for the milking machine while milking. CONSTITUTION:The inside of a casing is partitioned with diaphragms 3 and 7 to dewarkates a first room 4, a second room 5, a third room 13 and the fourth room 12. The first room is provided with a pressure regulating hole 2a communicating with a vacuum system 1 to be pressure-regulated, a pressure regulating valve displacing with the diaphragms and an opening 4a to a vacuum system 15 to be pressure-regulated into a vacuum degree which is lower than that of the vacuum system 1 by fixed pressure. Furthermore, the second room has an air flow limiting hole 5a and an air inlet hole 6a, the third room has a pilot valve 6 regulating an air flow rate flowing from the third room into the second room and an opening part 14 to the second room, and the fourth room has the diaphragm 7 and a supporting spring 8 in the vacuum regulator. Besides, the vacuum regulator also has a conical part 21 where the pressure regulating valve can choke the pressure regulating hole and a spiral part 22 provided from the conical part 21 in the direction of its tip.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a vacuum pressure generated by a vacuum pump or the like, or a vacuum used for lowering a vacuum degree in a vacuum pipe to a desired vacuum degree and supplying it to a low vacuum side pipe or the like. A pressure regulator, which is particularly used for the purpose of connecting to a vacuum milking machine for dairy cows and keeping the degree of vacuum constant.

[0002]

2. Description of the Related Art As a vacuum pressure regulator for maintaining a constant vacuum pressure in the vacuum line by connecting it to a vacuum pump or a vacuum line connected to the vacuum pump, for example, the applicant of the present invention has developed a model 61. -125272, or JP-A-59
No. 175832. This is shown in FIG.
As shown in FIG. 3, the pressure regulating valve 82 is provided by the diaphragm 83 having the pressure regulating valve 82 that regulates the amount of air flowing into the vacuum system 81.
It is partitioned into a first chamber 84 on the side and a second chamber 85 on the opposite side to the pressure regulating valve 82. The first chamber 84 is opened to the atmosphere through an opening 95, and the second chamber 85 is opened. , The pilot valve 86 is opened to the atmosphere through the exposed air inlet 86a and the opening 94, and communicated with the vacuum system 81 through the airflow restricting hole 91 having a predetermined size. It is the vacuum regulator 40 characterized by the above. Reference numeral 87 is a diaphragm, 94a is an air filter, 88 is a spring that pushes the diaphragm 87 downward, and 89 is a spring pressure adjusting screw of this spring.

The operation of the vacuum regulator 40 is performed by a vacuum system 81.
The vacuum pressure of the fourth chamber 92 and the second chamber 85,
The pilot valve 86 automatically adjusts the opening degree of the air inlet 86a by the balance between the vacuum pressure of the chamber and the pressing force of the spring 88. Then, according to the difference between the air inflow amount from the air inlet 86a and the air outflow amount from the airflow restricting hole 91,
The degree of vacuum in the second chamber is adjusted, and as a result, the pressure fluctuation in the vacuum system 81 becomes a pressure change in the second chamber, and the diaphragm 8
3, the valve element 82 is displaced upward or downward to adjust the amount of air flowing into the vacuum system 81, and the vacuum system 8
It operates to keep the pressure of 1 constant.

This type of vacuum regulator has the function of keeping the vacuum pressure of the entire vacuum system connected to it constant with reference to the atmospheric pressure.
The vacuum pressure adjuster disclosed in Japanese Patent No. 3 is the same as the vacuum pressure adjuster shown in FIG.
By connecting to the opening 94 of the chamber, the first chamber 84 and the third chamber 93 are communicated with each other, and the opening 9 of the first chamber 84 is connected.
5 corresponds to the connection port to the second vacuum system to be pressure-controlled so that the first vacuum system 81 has a degree of vacuum reduced by a constant differential pressure. The vacuum pressure regulator shown in FIG. 1 as the first embodiment of the present invention has the same structure as the vacuum pressure regulator disclosed in Japanese Utility Model Laid-Open No. 63-123780, except for the structure of the pressure regulating valve 2.

In this vacuum pressure regulator, the first vacuum system is maintained at a certain degree of vacuum, and the second vacuum system is lowered from the degree of vacuum of the first vacuum system by a certain value. It operates so as to keep the vacuum degree of. These vacuum regulators
For example, one of a pair of vacuum pressure supply lines arranged in a cow house is used as a milk pipe for milk transportation (corresponding to the high vacuum pipe 1a in FIG. 1) corresponding to the first vacuum system, and the other is A vacuum pipe (corresponding to the low vacuum pipe 15a in FIG. 1) for supplying a vacuum pressure for operating the milking machine, which corresponds to the second vacuum system, and the vacuum pressure is taken out from both pipes. , The milking machine is operated by supplying it to the milking machine which is connected by a flexible pipe.

[0006]

[Problems to be Solved] The above-mentioned milking machine performs milking by pulsatingly consuming vacuum pressure. Therefore, in both pipes, a complicated pressure fluctuation occurs due to the vacuum pressure consumption by one or several milking machines, and the vacuum pressure regulator operates so as to smooth the pressure fluctuation. However, these conventional vacuum pressure regulators cannot completely smooth these effects, and during the milking by the vacuum milking machine, the vacuum pressure often changes periodically,
This makes cows uncomfortable, reduces milking, and
It adversely affects the cow's udder and causes mastitis.
It had a negative impact on the health of the cows.

[0007]

OBJECTS OF THE INVENTION The present invention tends to occur in a vacuum system that quickly follows the pressure fluctuations of the vacuum system to be controlled, smoothes it, and supplies vacuum pressure to the milking machine during milking. The purpose of the present invention is to provide a vacuum regulator for a milking machine in which periodic pressure fluctuations are hardly seen.

[0008]

The present inventor has dealt with such an actual situation and pursued the cause thereof in order to achieve the above object.
It has been found that these drawbacks can be remarkably ameliorated by adopting the structure of the pressure regulating valve that alleviates the abrupt change of the flow velocity or the flow rate of the air flowing through the gap between the pressure regulating hole and the pressure regulating valve, and the present invention is realized. It has been completed. The first gist of the present invention is to partition each of the two chambers, which are mutually independent spaces, by a diaphragm made of an elastic material, so that the first chamber and the second chamber and the third chamber that are adjacent to the first chamber through the diaphragm. A chamber and a fourth chamber adjacent to the chamber via a diaphragm are respectively defined and formed, and the first chamber has a pressure regulating hole communicating with a vacuum system to be pressure regulated, an opening communicating with the atmosphere, and the first chamber. A pressure regulating valve which is provided at a free end of a valve rod fixed to a diaphragm separating the chamber and the second chamber, and which is arranged in the pressure regulating hole so as to regulate the opening degree of the pressure regulating hole by the displacement of the diaphragm. The second chamber has an air introduction hole communicating with the vacuum system through an air flow restriction hole and also has an air introduction hole communicating with the third chamber, and the third chamber is a diaphragm partitioning the third chamber and the fourth chamber. The air introduction hole is moved from the third chamber to face the air introduction hole by the displacement. Has a pilot valve for adjusting the flow rate of air entering the second chamber and an opening communicating with the atmosphere, and the fourth chamber communicates with the vacuum system or the atmosphere and has a boundary with the third chamber. In a vacuum pressure regulator having means for supporting the diaphragm by elastic force, the pressure regulating valve, at least, a conical portion capable of abutting the peripheral portion of the pressure regulating hole to close the pressure regulating hole, And a spiral portion provided from the conical portion toward the tip thereof.

A second aspect of the present invention is to partition each of the two chambers, which are spaces independent of each other, with a diaphragm made of an elastic material, so that the first chamber and the second chamber adjacent to the first chamber via the diaphragm. , A third chamber and a fourth chamber adjacent to the third chamber via a diaphragm are defined and formed, and the first chamber has a pressure adjusting hole communicating with the first vacuum system to be pressure adjusted and the first vacuum system. An opening opening to a second vacuum system to be pressure-controlled so as to have a constant differential pressure, and a free end of a valve rod fixed to a diaphragm separating the first chamber and the second chamber, and the diaphragm. And a pressure regulating valve facing the pressure regulating hole so as to regulate the opening degree of the pressure regulating hole by the displacement of the second chamber, the second chamber communicates with the first vacuum system through the air flow regulating hole, and the third chamber The third chamber has a communicating air introduction hole, and the third chamber divides the third chamber from the fourth chamber. A pilot valve that adjusts the flow rate of air that passes through the air introduction hole from the third chamber and enters the second chamber by facing the air introduction hole due to the displacement of the flam communicates with either the atmosphere or the first chamber. In the vacuum pressure supply device, the fourth chamber having an opening, the fourth chamber communicating with the first vacuum system and supporting the diaphragm forming a boundary with the third chamber by elastic force, Has at least a conical portion capable of abutting the peripheral edge of the pressure regulating hole to close the pressure regulating hole, and a spiral portion provided from the conical portion toward the tip direction thereof. It is in a vacuum pressure regulator.

In each of the above vacuum pressure regulators, the spiral portion has a spiral groove formed in a cylinder extending coaxially from the conical portion of the pressure regulating valve and / or an outer peripheral surface of the conical body. May be formed by engraving, or alternatively, may be formed by a spiral strip provided in a state of winding a support shaft extending along the conical axis from the conical portion of the pressure regulating valve. It may be present. Hereinafter, a detailed description will be given based on embodiments with reference to the drawings.

[0011]

First Embodiment FIGS. 1 and 2 show a first embodiment of the present invention, the construction of which is shown in FIGS.
By partitioning the two chambers formed by the diaphragms 3 and 7 made of an elastic material such as rubber, respectively, the first chamber 4 and the second chamber 5, the third chamber 13 adjacent thereto and the third chamber The adjacent fourth chamber 12 is partitioned and formed. A pressure adjusting hole 2a is opened in the first chamber 4, and the pressure adjusting hole 2a is formed.
A projecting edge 19 provided around the above is airtightly fitted to the rising edge 1c of the mounting hole 1b provided in the high vacuum pipe 1a filled with the high vacuum pressure. By connecting the high vacuum pipe 1a to the vacuum pump 63 (see FIG. 6) at one end,
It constitutes a first vacuum system 1 to be controlled.

A pressure adjusting hole 2 is provided near the center of the diaphragm 3.
The base portion 2c of the valve rod 2 that hangs down facing a is fixed. The pressure regulating valve 20 can completely close the pressure regulating hole 2a,
It is also possible to keep the pressure adjusting hole open by stopping at the position where the vacuum pressures of the first chamber and the second chamber are balanced. In order to stabilize the operation of the pressure regulating valve 20, the valve rod 2
May be slidably supported by a guide tube that is fitted into the guide tube with a slight gap. The first chamber is provided with an opening 4a for supplying a vacuum pressure reduced by a constant differential pressure to the high vacuum pipe, and the second vacuum system 15 is provided in the opening 4a. The constituent low vacuum pipes 15a are connected.

A ventilation port 4b, which bypasses the second chamber 5 and communicates with the inside of the third chamber 13, is opened on the upper wall surface of the first chamber. The second chamber 5 is connected by a connecting pipe 11a to a communication pipe 11 that communicates the fourth chamber 12 with the high vacuum pipe 1a through an air flow restriction hole 5a formed of a small hole provided on the wall surface of the second chamber 5. In addition, the third chamber 1
An air introduction hole 6a leading to 3 is provided. A pilot valve capable of closing the introduction hole 6a faces the air introduction hole 6a from the second chamber 5 side.
b is a diaphragm 7 that divides and forms a third chamber and a fourth chamber
It is fixed to the central part of the.

The third chamber is provided with an opening 14 which communicates with the ventilation port 4b of the first chamber through the air filter 14a and the bypass conduit 4c. An opening 10 is formed in the wall surface of the fourth chamber 12, and the opening 10 communicates with the high vacuum pipe 1a through the communication pipe 11.
A spring adjusting screw 9 is airtightly screwed to the ceiling surface of the fourth chamber 12, and a compression spring 8 is interposed between the spring bearing portion 9a of the screw 9 and the central upper surface of the diaphragm 7. It consists of

Such a structure is no different from the structure of the conventional vacuum pressure regulator. A feature of the vacuum pressure regulator according to the present invention is the structure of the pressure regulating valve 20. The pressure regulating valve 20 is provided at the free end of the valve rod 2 and is provided in the bottom circle so as to have a substantially inverted truncated cone-shaped conical portion 21 and the conical portion 21. The conical portion 21 is provided coaxially with the conical axis in the extending direction of the conical axis. The point is that it is constituted by the spiral portion 22 formed by forming the spiral groove 24 on the outer peripheral surface of the column 23.

In the above embodiment, the opening 14 of the third chamber 13
Is configured to communicate with the first chamber 4 and allow air to flow from the first chamber to the third chamber.
By opening to the atmosphere through the filter 14a and not providing the vent hole 4b and the bypass conduit 4c,
The pilot valve 6 can be actuated on the basis of the atmospheric pressure to achieve the same purpose. However, in this case, since the differential pressure between the third chamber and the fourth chamber becomes large, it is necessary to increase the elastic force of the compression spring 8.

[0017]

When the vacuum pressure feeder shown in the above embodiment is applied to the vacuum piping type milking apparatus as shown in FIG. 5, the high vacuum pipe 1a directly connected to the vacuum pump 63 will be described.
Is branched via the vacuum pressure feeder A of the above-mentioned Embodiment 1,
A low vacuum pipe 15a for supplying a vacuum pressure to the pulsator 67 is provided in parallel with the high vacuum pipe 1a, and is arranged in the barn. The high and low vacuum pipes are provided with vacuum outlets 61, 62 ... At a plurality of places, and milking units are connected to the vacuum outlets for use. The low vacuum pipe 15a reduces the low vacuum pressure supplied from the high vacuum pipe 1a side by the vacuum pressure supplier A to a desired constant value (for example, 3).
In order to maintain 50 mmHg), the amount of air flowing into the low vacuum pipe 15a is adjusted according to the fluctuation of the vacuum consumption on the milking unit side, and the inside of the connected pipe is kept constant with respect to the atmosphere. Vacuum pressure regulator B that works to keep the pressure of
(In the vacuum pressure regulator of the configuration shown in FIG. 5, only the structure of the pressure regulating valve 82 has the same structure as the pressure regulating valve 20 of the first embodiment.).

In the milking machine, the vacuum pressure from the low vacuum pipe is alternately sent to the pulsating chamber of the taste cup 69 through the flexible connecting pipe 68 to the pulsating chamber of the taste cup 69 and the vacuum outlet 62 of the high vacuum pipe. connected via a flexible connecting pipe 72, te _I a supply vacuum pressure from high vacuum pipe 1a
Supplies and vacuum to bovine teats Tokappu in 69, the milk claw 65 for transport by Atsumarichichi milking by milk in the Te _Lee Tokappu high vacuum pipe, high vacuum pipe 1
Reliza 71 in which the milk collected in a is stored and stored
Etc.

In such an apparatus, the vacuum pump 63
Is activated, the vacuum pressure in the high vacuum pipe 1a rises,
This extends through the communication pipe 11 to the fourth chamber, the diaphragm 7 rises against the spring pressure, and therefore the pilot valve 6a closes the air introduction hole 6a, so that the vacuum pressure from the small hole 5a is reduced. , The vacuum pressure in the second chamber rises, and the valve body 2 rises. As a result, the vacuum pressure in the low vacuum pipe 15a rises to the target value. When the target value is reached in the low vacuum pipe, the vacuum regulator 40 is activated to maintain the desired vacuum pressure in the pipe. This vacuum pressure acts on the diaphragm 3 as the vacuum pressure of the first chamber 4, reaches the third chamber 13 through the bypass conduit 4c, and also acts on the diaphragm 7. As a result, the pilot valve 6 descends, the degree of vacuum in the second chamber 5 also decreases, the diaphragm 3 descends, and the high vacuum pipe 1a and the low vacuum pipe 1
The valve element 2 is stopped at a position where 5a and the desired vacuum pressure are balanced.

That is, in the above apparatus, since the vacuum pressure in the low vacuum pipe is kept constant by the vacuum pressure regulator B, the vacuum pressure in the high vacuum pipe is the same as that of the valve body 2 and the pressure adjusting hole 2a. Determined by the amount of air flowing in through the gap. The opening of the pressure adjusting hole can be adjusted by adjusting the spring adjusting screw 9. By using the milking unit, when the vacuum in the vacuum pipe is consumed, the pressure fluctuations in the low vacuum pipe are caused by the vacuum pressure regulator B being activated and the individual vacuum pressures due to the operation of the milking machine. The pulsation can be smoothed and maintained at a substantially constant vacuum pressure. On the other hand, when the pressure of the high vacuum pipe becomes higher than a predetermined vacuum pressure, the vacuum pressure of the fourth chamber 12 of the vacuum pressure supplier A rises → the pilot valve rises → from the first chamber to the second chamber 5. A sequence of decrease in air inflow → increase in vacuum pressure in the second chamber → increase in valve body 2 → increase in air inflow into the high vacuum pipe returns to the original pressure.

When the vacuum pressure is reduced, conversely, the vacuum pressure in the fourth chamber is lowered, the pilot valve is lowered, the vacuum pressure in the second chamber is lowered, and the valve body 2 is lowered. The pressure rises and returns to the original pressure. Also in the vacuum pressure regulator B, the operating mechanism is almost the same except that the reference is atmospheric pressure. Thus, the low vacuum pipe can be supplied while reducing the vacuum pressure of the vacuum supply source by a constant amount and also maintaining the vacuum pressure on the vacuum supply side constant. In such a mechanism, conventionally, the vacuum systems 1 and 2 have been periodically disturbed due to the delay of the operation of the pressure regulating valve and the excessive reaction operation, but the gap between the pressure regulating valve 20 and the pressure regulating hole 2a can be formed at high speed. The airflow passing through
The spiral portion 22 reduces its speed and suppresses the undesirable operation of the pressure regulating valve by generating a vortex flow along the spiral portion.

[0022]

Second Embodiment FIG. 3 shows a pressure regulating valve according to a second embodiment of the present invention. A pressure regulating valve 30 has a conical portion 31 having an inverted truncated cone shape and a small circular portion 32 of the conical portion. A support shaft 33 having a small conical holding protrusion 34 at the lower end coaxially with the conical axis is provided by screwing the upper end thereof, and a coil spring is provided between the conical portion 31 and the holding protrusion 34. And a spiral portion formed by sandwiching such a spiral strip 35. Other configurations and operations are exactly the same as in the case of the first embodiment.

[0023]

Third Embodiment FIG. 4 shows a pressure regulating valve 40 according to a third embodiment of the present invention.
Is shown. In the first embodiment, the spiral portion is
It was formed by engraving the outer circumference of the cylinder into a male thread,
In this case, on the surface of the circular cylinder 42 extending coaxially with the cone axis downward from the small circle portion 41a of the conical portion 41, and on the surface of the conical body 43 integrally extending downward from the lower end of the circular cylinder, metal,
It is different in that a spiral portion is formed by winding a spiral strip 44 made of an elastic material such as plastic or rubber, and the other structure is exactly the same as that of the second embodiment.

[0024]

[Effect] The pressure of the vacuum system that supplies the vacuum pressure to the milking machine fluctuates intricately due to the momentary change in the amount of milking from the start to the end of milking, the effect of simultaneous use of multiple milking machines, etc. In the state where the individual fluctuation factors of are combined, a pressure fluctuation is exerted on the vacuum pressure regulator, and the follow-up is delayed or the pressure regulating valve reacts excessively to these,
Although the periodic pressure change of the vacuum system was likely to occur, the vacuum pressure regulator of the present application, by providing the pressure regulating valve with the spiral portion, swirls the air flow supplied to the vacuum system to generate a vortex flow. As a result, the air supply speed (in other words, the speed at which the degree of vacuum decreases) is reduced, and the vortex flow also exerts a force that pushes the pressure regulating valve downwards, thereby causing a pressure fluctuation. The correction operation for is accelerated, and the pressure of the vacuum system during milking can be significantly stabilized.
Therefore, it is possible to prevent the bad influence on the cow due to the malfunction of the conventional milking machine.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is an explanatory view showing the structure of the pressure regulating valve of the first embodiment.

FIG. 3 is an explanatory diagram showing a main part of a second embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a main part of a third embodiment of the present invention.

FIG. 5 is an explanatory view showing a usage state of the vacuum pressure regulator according to the present invention.

FIG. 6 is an explanatory diagram showing an example of a conventional technique.

[Explanation of symbols]

 1 1st vacuum system 15 2nd vacuum system 2a Pressure regulation hole 20 Pressure regulation valve 21 Conical part 22 Spiral part 6 Pilot valve 3,7 Diaphragm 4 1st chamber 5 2nd chamber 13 3rd chamber 12 4th chamber

Claims (4)

[Claims] 1. A first chamber and a second chamber, a third chamber and a chamber adjacent to the first chamber through a diaphragm, by partitioning each of the two chambers consisting of mutually independent spaces with a diaphragm made of an elastic material. Adjacent fourth chambers are formed by partitioning through a diaphragm, and the first chamber has a pressure regulating hole communicating with a vacuum system to be pressure regulated, an opening communicating with the atmosphere, and the first chamber and the second chamber. A pressure regulating valve which is provided at a free end of a valve rod fixed to a diaphragm that separates the chamber from the chamber, and which is provided in the pressure regulating hole so as to adjust the opening of the pressure regulating hole by the displacement of the diaphragm; The second chamber has an air introduction hole communicating with the vacuum system through an air flow restriction hole and also has an air introducing hole communicating with the third chamber, and the third chamber has the air due to a displacement of a diaphragm separating the third chamber and the fourth chamber. The air is introduced from the third chamber through the air introduction hole to face the introduction hole. The fourth chamber has a pilot valve for adjusting the flow rate of air entering the chamber and an opening communicating with the atmosphere, and the fourth chamber has a diaphragm that communicates with the vacuum system or the atmosphere and forms a boundary with the third chamber. In a vacuum pressure regulator provided with means for supporting by a force, the pressure regulating valve comprises a conical portion capable of abutting a peripheral portion of the pressure regulating hole to close the pressure regulating hole, and a tip direction from the conical portion. And a spiral part provided toward the vacuum pressure regulator. 2. A first chamber and a second chamber, a third chamber and a chamber adjacent to the first chamber via a diaphragm, by partitioning each of the two chambers consisting of mutually independent spaces with a diaphragm made of an elastic material. An adjacent fourth chamber is defined by a diaphragm, and the first chamber has a pressure adjusting hole communicating with the first vacuum system to be pressure adjusted and a constant differential pressure with respect to the first vacuum system. Is provided at the free end of the valve rod that is fixed to the opening that opens to the second vacuum system that is to be pressure regulated, and the diaphragm that separates the first chamber and the second chamber, and the displacement of the diaphragm causes the pressure regulating hole to move. The second chamber is provided with a pressure regulating valve facing the pressure regulating hole so as to adjust the opening degree, and the second chamber has an air introduction hole communicating with the first vacuum system through the air flow regulating hole and also with the third chamber. However, the third chamber is separated by the displacement of the diaphragm that separates the third and fourth chambers. A pilot valve facing the air introducing hole and adjusting the flow rate of the air that passes through the air introducing hole from the third chamber and enters the second chamber, and an opening communicating with either the atmosphere or the first chamber. The fourth chamber has a means for supporting the diaphragm, which communicates with the first vacuum system and forms a boundary with the third chamber, by elastic force, and A vacuum pressure characterized by having a conical portion that can abut the peripheral portion of the pressure hole to close the pressure adjusting hole, and a spiral portion provided from the conical portion toward the tip direction thereof. Coordinator. 3. The spiral portion is formed by forming a spiral groove or a spiral ridge on the outer peripheral surface of a cylinder and / or a conical body extending coaxially with the conical axis from the conical portion of the pressure regulating valve. The vacuum pressure regulator according to claim 1 or 2, which is provided. 4. The spiral portion is constituted by a spiral ridge provided in a state of winding a support shaft extending along the conical axis from the conical portion of the pressure regulating valve. Vacuum pressure regulator.