JPH0830986B2 - Vacuum pressure regulator - Google Patents

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 the degree of vacuum in vacuum piping to a desired degree of vacuum and supplying it to the low vacuum side piping. A pressure regulator, which is used especially 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 a 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 put it into practice. -125272, or JP-A-59-59
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 for regulating 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 was opened to the atmosphere through the exposed air inlet 86a and the opening 94, and was communicated with the vacuum system 81 through the airflow restricting hole 91 having a predetermined size. The vacuum regulator 40 is characterized in that. 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, by 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, pressure fluctuations in the vacuum system 81 result in pressure changes in the second chamber, and the diaphragm 8
3, the valve body 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.

The vacuum regulator of this type has a function of keeping the vacuum pressure of the entire vacuum system connected to the vacuum regulator constant with reference to the atmospheric pressure.
The vacuum pressure regulator disclosed in FIG. 6 is the same as the vacuum pressure regulator 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. These vacuum pressure regulators
For example, one of a pair of vacuum pressure supply lines arranged in a cowshed is 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 the 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 milk production, and
It adversely affects the cow's udder and causes mastitis.
It had a bad effect 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. It is an object of the present invention 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, as a result of pursuing the cause thereof in order to achieve the above-mentioned object,
It has been found that these drawbacks are remarkably ameliorated by adopting the structure of the pressure regulating valve that alleviates the abrupt change in 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 which are adjacent to the first chamber via the diaphragm. A chamber and a fourth chamber adjacent to the chamber via a diaphragm are respectively partitioned 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 provided in the pressure regulating hole so as to regulate 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 restricting hole and also has an air introducing hole communicating with the third chamber, and the third chamber is a diaphragm for partitioning the third chamber and the fourth chamber. The air introduction hole is moved from the third chamber to the air introduction hole by displacement. And 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 provided with 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 from each other, by 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 the first chamber has a pressure regulating hole communicating with the first vacuum system to be regulated and the first vacuum system. An opening opening to a second vacuum system to be pressure-controlled so as to have a constant pressure difference, 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 adjust the opening 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 by the displacement of the flam is in communication 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 that abuts 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 direction thereof. It is in a vacuum pressure regulator.

In each of the above vacuum pressure regulators, the spiral portion has a spiral groove extending from the conical portion of the pressure regulating valve to the cylinder extending coaxially with the conical axis and / or the outer peripheral surface of the conical body. May be formed by engraving, or alternatively, it 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. You may have something. Hereinafter, a detailed description will be given based on embodiments with reference to the drawings.

[0011]

Embodiment 1 FIGS. 1 and 2 show a first embodiment of the present invention, the structure 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.
The projecting edge 19 provided surrounding 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,
A first vacuum system 1 to be controlled is constructed.

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 connection 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, on the ceiling surface that forms a boundary with the third chamber 13, 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 onto 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. The vacuum pressure regulator according to the present invention is characterized by the structure of the pressure regulating valve 20. The pressure regulating valve 20 is provided at the free end of the valve rod 2 in a bottom circle and is provided with a substantially inverted truncated cone-shaped conical portion 21 and a conical axis of the conical portion 21 in the extending direction of the conical axis. It is configured 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 a vacuum piping type milking apparatus as shown in FIG. 5, a high vacuum pipe 1a directly connected to the vacuum pump 63 will be described.
Is branched via the vacuum pressure supply device A of the first embodiment,
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 a 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 regulator having 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).

The milking machine sends the vacuum pressure from the low vacuum pipe through the flexible connecting pipe 68 to the pulsating chamber of the Tate cup 69 alternately with the atmosphere, and the pulsator 67 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 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 body 2 stops 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. It depends on the amount of air flowing in from 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 activation of the vacuum pressure regulator B, which causes the individual vacuum pressures to be affected by the operation of the milking machine. The pulsation can be smoothed and kept at a substantially constant vacuum pressure. On the other hand, when the pressure of the high vacuum pipe becomes higher than the 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 chain 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 occurs and the original pressure is restored.

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 reduced, 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 are 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 is rapidly moved. The airflow passing through
The spiral portion 22 reduces its speed and suppresses undesired 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 spindle 33 having a small conical holding projection 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 projection 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 cylinder 42 extending coaxially with the cone axis downward from the small circle portion 41a of the cone portion 41 and the surface of the cone body 43 integrally extending downward from the lower end of the 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 structures are the same as those of the second embodiment.

[0024]

[Effect] The pressure of the vacuum system that supplies the vacuum pressure to the milking machine changes intricately due to the momentary change of the milking amount from the start to the end of milking, the influence 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 acts on the pressure regulator valve itself by pushing it downward, thereby causing pressure fluctuations. 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

Front Page Continuation (56) References JP-A-63-123780 (JP, A) JP-A-59-175832 (JP, A) JP-A-60-9438 (JP, A) JP-A-59-125827 (JP , A) Japanese Unexamined Patent Publication No. 58-190332 (JP, A) Actually developed 61-125272 (JP, U)

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 via 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 provided at a free end of a valve rod fixed to a diaphragm separating the chamber from the chamber, and having a pressure regulating hole facing the pressure regulating hole 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 introducing hole to face the introducing 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 portion 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 partitioned and formed via a diaphragm, and the first chamber has a pressure regulating hole communicating with the first vacuum system to be regulated 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 to be pressure-controlled, and the diaphragm that separates the first chamber and the second chamber, and the displacement of the diaphragm causes the pressure-adjusting hole to move. The second chamber has an air introduction hole that communicates with the first chamber and an air introduction hole that communicates 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 that adjusts the flow rate of air that passes through the air introduction hole from the third chamber and enters the second chamber facing the air introduction hole, and an opening communicating with either the atmosphere or the first chamber. And a fourth chamber, wherein the fourth pressure chamber is provided with means for communicating the first vacuum system and supporting the diaphragm, which forms a boundary with the third chamber, by elastic force. A vacuum pressure having a conical portion that abuts a peripheral portion of the pressure hole and can close the pressure adjusting hole, and a spiral portion provided from the conical portion toward a tip end thereof. Coordinator. 3. The spiral part 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 from the conical part 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.