JP2014189968A - Vacuum pressure recovery device, vacuum type sewerage system, and vacuum pressure recovery method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recover the pressure in a vacuum conduit of a vacuum type sewerage system.SOLUTION: A vacuum pressure recovery device includes: an atmospheric opening valve in which, when a pressure equal to or less than a first pressure is provided, a first valve body moves and opens an air circulation path introducing air into a vacuum conduit, the provided pressure rises to a prescribed pressure, thereby the moved first valve body returns and the air circulation path is closed; a vacuum pressure circulation flow channel connected to the vacuum conduit and the atmospheric opening valve, and providing the prescribed pressure obtained on the basis of a pressure in the vacuum conduit to the atmospheric opening valve; a mechanical controller configured so that, when the pressure in the vacuum conduit rises to a pressure equal to or more than a second pressure, a second valve body moves by utilizing an increase in pressure and opens the air circulation path; and an atmospheric air introduction section installed on halfway of the vacuum pressure circulation flow channel and communicating with the atmosphere, gradually introducing air into the vacuum pressure circulation flow channel, and gradually increasing the prescribed pressure provided to the atmospheric opening valve.

Description

  The present invention relates to a technique for recovering pressure in a vacuum line in a vacuum sewer system.

  In the vacuum sewer system, sewage discharged from homes and factories is stored in sewage in the vacuum valve unit. When the water level in the sewage basin rises, the valve of the vacuum valve unit opens, and the stored sewage is sucked into the vacuum sewage pipe (vacuum line). In this case, air is sucked into the vacuum pipe line after the sewage is sucked from the vacuum valve unit or simultaneously with the sewage suction. When the sucked air flows at high speed, a gas-liquid two-phase flow of air and sewage is formed and the sewage is conveyed. For this reason, the air for forming a gas-liquid two-phase flow in a vacuum pipe line is needed.

  The vacuum pipe is provided with a descending slope part and an ascending slope (lift) part alternately so that a long distance can be supplied by the gas-liquid two-phase flow. The vacuum sewer is connected to a vacuum station. The vacuum station includes a vacuum pump that generates a vacuum as a driving force for collecting sewage, a water collection tank that temporarily stores the collected sewage, and the like. The sewage collected in the vacuum station via the vacuum valve unit and the vacuum pipe line is conveyed to a sewage treatment plant or the like.

  In such a vacuum sewer system, when the amount of air in the vacuum pipe is insufficient, a gas-liquid two-phase flow that does not allow the sewage to exceed the lift is formed, and a phenomenon called a water block is formed in which the vacuum pipe is filled with sewage. Occur. When the water block is generated, the pressure on the upstream side, that is, the pressure opposite to the vacuum station is increased. Such an increase in pressure is not limited to the water block, but also occurs due to various factors such as filth being clogged in the vacuum pipe.

  In such a case, as a method of recovering the pressure in the vacuum pipe, when the pressure in the vacuum pipe rises to a predetermined value or more in the vacuum valve unit, air is introduced from the outside into the vacuum pipe and the pressure drops. An automatic air intake device that stops the introduction of air at a time when the air pressure becomes a predetermined value or less is provided.

JP 2000-144868 A JP 2000-129964 A JP 2000-96698 A Japanese Patent Laid-Open No. 10-60995

  However, if a large amount of air is introduced over a long period of time, the pressure may increase. For this reason, in a conventional automatic intake device, a small amount of air is sucked from a small-diameter nozzle in order to prevent an increase in pressure. In order to eliminate the water block and restore the pressure in the vacuum line, it is effective to introduce a large amount of air into the vacuum line in a short time. In the method of flowing into the road, there were cases where the water block could not be resolved or it took time to resolve.

  In addition, when a large number of automatic intake devices are installed in a vacuum sewer system, when the pressure of the entire system rises, air is introduced from a large number of automatic intake devices into the vacuum lines. If air exceeding the capacity of the vacuum pump of the vacuum station flows in, a system down may occur and a state where the system cannot be maintained may occur.

  Moreover, it is desirable that the pressure recovery in the vacuum sewer system, i.e., the pressure drop, be correctly operated even during a power failure. There is a type that operates without electric power as the above-described automatic intake device, but in such a type, the introduction of air is stopped only when the pressure in the vacuum line becomes a predetermined value or less. That is, if pressure does not recover, air will continue to be introduced into the vacuum line. In such a configuration, for example, when the vacuum pump of the vacuum station is stopped due to a power failure and the pressure rises as a result, air continues to be introduced into the vacuum line. Problems can arise.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as, for example, the following forms.

  The 1st form of this invention is provided as a vacuum pressure recovery apparatus for recovering the pressure in a vacuum pipe line in a vacuum type sewer system. This vacuum pressure recovery device is an air flow path for introducing air into a vacuum pipe line by moving the first valve body using the pressure when a pressure equal to or lower than the first pressure is provided. When the provided pressure rises to a predetermined pressure, the moved first valve body returns, and is connected to the atmosphere release valve, the vacuum line, and the atmosphere release valve that close the air flow path. When the pressure in the vacuum pressure channel for providing the internal pressure to the atmosphere release valve and the pressure in the vacuum pipe rise above the second pressure, the second valve body moves using the pressure. Thus, when the vacuum pressure flow passage is opened and the pressure in the vacuum pipe is lowered to a predetermined pressure, the moved second valve body is returned and the mechanical structure is configured to close the vacuum pressure flow passage. It is provided in the middle of the controller and the vacuum pressure flow path and communicates with the atmosphere. A air intake part which includes a ambient air intake part for gradually introducing air into the vacuum pressure flowing passage, gradually increased the pressure in the vacuum conduit provided in the air release valve.

According to such a vacuum pressure recovery device, when the pressure in the vacuum line rises and the pressure rises to the second pressure or higher, the vacuum pressure flow path is opened by the operation of the mechanical controller, and the pressure in the vacuum line is increased. Is provided to the atmosphere release valve. When the pressure is equal to or lower than the first pressure, the air release valve opens the air flow path and air is introduced into the vacuum line. As a result, the pressure in the vacuum pipe can be reduced and recovered. Moreover, after that, the pressure provided to the atmosphere release valve gradually increases as air is gradually introduced from the atmosphere introduction section. For this reason, the air flow path is closed after the elapse of a predetermined time regardless of whether the pressure in the vacuum pipe line is recovered. That is, the air flow path is not continuously opened until the pressure is restored. For this reason, it is possible to suppress the system from going down due to excessive air in the vacuum line. In this connection, since a large amount of air can be introduced in a short time, the water block can be preferably eliminated. Or control in which sewage does not stay in a vacuum pipe line is attained. Moreover, since the vacuum pressure recovery device is connected to the vacuum pipe, it is easier to control the entire vacuum sewer system than when a large number of vacuum valve units are provided with automatic intake devices. Furthermore, since the vacuum pressure recovery device can be operated without electric power, it can also be operated during a power failure. In addition, after the air circulation path is opened and then closed, the air circulation path opening / closing operation is repeated any number of times as long as the operation condition is satisfied. Thus, even when the pressure is not recovered by one opening / closing operation of the air flow path, the pressure can be recovered by repeatedly performing the opening / closing operation. In addition, in this application, a pressure means the pressure at the time of making atmospheric pressure into a reference | standard (zero), ie, a gauge pressure. Pressure recovery refers to returning to a state close to vacuum, that is, a negative value of pressure increases.

  As the second aspect of the present invention, the second pressure in the first aspect needs to be lower than the first pressure. According to this form, air can be introduced into the vacuum line only when the pressure in the vacuum line is in a predetermined range lower than the atmospheric pressure (zero) state. Therefore, introduction of air can be limited when the pressure rises excessively (the pressure in the vacuum line is higher than the first pressure). As a result, when the vacuum pump of the vacuum station is stopped due to a power failure or the like, it is possible to prevent the system from going down by introducing excessive air into the vacuum line.

  As a third aspect of the present invention, in the second aspect, the atmosphere release valve is connected to the first valve body or the first valve body when the first valve body is in a position to close the air flow path. You may provide the adsorption | suction part which adsorb | sucks the made member. According to such a form, the first valve element does not move in the direction of opening the air flow path unless a pressure higher than a predetermined level that resists the adsorption force is applied. That is, the air release valve can be easily configured so that the first pressure is higher than the second pressure. Moreover, since the speed at which the first valve body opens the air flow path is increased, that is, the air flow path is opened quickly and completely, compared with the case where the air flow path is opened slowly, or the air flow path. A large amount of air can be introduced into the vacuum pipe in a short time compared to the case where the path is maintained in a slightly open state. Therefore, the pressure in the vacuum line can be effectively recovered.

  As a fourth aspect of the present invention, in any one of the first to third aspects, the vacuum pressure recovery device further includes a vacuum pressure accumulation tank for accumulating the pressure in the vacuum pipe in the middle of the vacuum pressure flow path. And a check valve provided between the vacuum pressure storage tank and the vacuum pipe, and may be provided with a check valve that allows flow only in the direction from the vacuum pressure storage tank to the vacuum pipe. . The vacuum pressure accumulation tank and the check valve may be provided at a position where the communication state between the vacuum pressure accumulation tank and the check valve and the vacuum line is not closed by the movement of the second valve body. According to such a form, even when the pressure in the vacuum pipe line suddenly increases, the pressure provided to the atmosphere release valve can be sufficiently reduced using the pressure accumulated in the vacuum pressure accumulation tank. . Therefore, at least once, the air flow path can be opened and air can be introduced into the vacuum line.

  The fourth embodiment has a further effect when combined with the second or third embodiment. Specifically, when the pressure in the vacuum pipe line suddenly increases, it is possible to open the air flow path and introduce air into the vacuum pipe at least once to try to recover the pressure. Thereby, if the pressure does not recover, if the pressure is excessively high (if the pressure is higher than the first pressure), the first valve body again moves the air flow path regardless of the operation of the mechanical controller. Never open. As a result, it is possible to prevent the system from going down by introducing more air into the vacuum line with respect to the vacuum line whose pressure is excessively high.

  As a fifth aspect of the present invention, in any one of the first to third aspects, a vacuum pressure accumulation tank for accumulating the pressure in the vacuum pipe is not provided in the middle of the vacuum pressure flow path. Good. According to this form, the configuration of the vacuum pressure recovery device can be simplified. In addition, the fifth embodiment has a further effect by being combined with the second or third embodiment. That is, when the pressure in the vacuum line is excessively high (the pressure is higher than the first pressure), air is not introduced into the vacuum line. For this reason, it is possible to more reliably prevent the system from going down.

As a sixth aspect of the present invention, in any one of the first to fifth aspects, the atmosphere release valve is a first chamber that is isolated by a diaphragm and is provided with a pressure of a vacuum line, and is in communication with the atmosphere. And two chambers. An air inlet for introducing air into the vacuum line through the second chamber may be formed in the second chamber as part of the air flow path. The first valve body may be connected to the diaphragm in the second chamber and urged to a position where the air inlet is closed. The air release valve moves to a position where the first valve body opens the air inlet by the pressure difference between the first chamber and the second chamber when a pressure equal to or lower than the first pressure is provided to the first chamber. It may be configured to.

  As a seventh aspect of the present invention, in any one of the sixth aspects, an internal flow path serving as a part of a vacuum pressure flow path between the vacuum line and the atmosphere release valve is provided inside the mechanical controller. It may be formed. The mechanical controller includes a first hole for communicating the internal flow path and the atmosphere, and a second hole for communicating with a vacuum pressure flow path between the vacuum pipe and the mechanical controller; A third hole for communicating with the vacuum pressure flow path between the air release valve and the mechanical controller may be formed. The second valve body is urged to a position where the first hole portion and the third hole portion are communicated with each other and the second hole portion and the third hole portion are not communicated with each other. Also good. Further, when the pressure in the vacuum pipe rises to be equal to or higher than the second pressure, the second valve body makes the second hole and the third hole communicate with each other using a change in pressure, And you may open a vacuum pressure distribution flow path by moving to the position which does not make the 1st hole and the 3rd hole communicate.

  An eighth aspect of the present invention is provided as a vacuum sewer system including any one of the first to seventh vacuum pressure recovery devices. According to this system, the same effects as those of the first to seventh embodiments can be obtained.

  The ninth aspect of the present invention is provided as a vacuum pressure recovery method for recovering the pressure in the vacuum pipe without power in a vacuum sewer system. In this method, when the pressure in the vacuum line rises above the second pressure, a vacuum pressure for providing the pressure in the vacuum line by moving the second valve body using the increase in pressure. A pressure equal to or lower than the first pressure is provided to the atmosphere release valve that opens the flow passage and opens and closes the air flow passage for introducing air into the vacuum pipe line through the opened vacuum pressure flow passage. The first valve body provided in the atmosphere release valve is moved using the air to open the air circulation path, and is provided in the middle of the vacuum pressure circulation path, from the atmosphere introduction portion communicating with the atmosphere to the vacuum pressure circulation path Air is gradually introduced into the air, and a pressure equal to or lower than the first pressure provided to the air release valve is gradually increased to cause the air release valve to close the air flow path. According to this method, the same effect as that of the first embodiment is obtained.

It is explanatory drawing which shows schematic structure of the vacuum-type sewer system as one Example of this invention. It is explanatory drawing which shows schematic structure of a vacuum pressure recovery apparatus. It is explanatory drawing which shows the relationship between the pressure of a vacuum line, and the operation | movement of a controller and an air release valve.

A. Example:
FIG. 1 is an explanatory diagram showing a schematic configuration of a vacuum sewer system 10 as an embodiment of the present invention. The vacuum sewer system 10 includes a plurality of vacuum valve units 20a to 20c, a vacuum line 40, a vacuum station 50, and a vacuum pressure recovery device 100. The vacuum valve units 20a to 20c include a vacuum valve (not shown) when the sewage water is stored to store the sewage discharged from a home or factory. The vacuum valve units 20 a to 20 c are configured such that when the water level of the sewage is raised, the vacuum valve is opened and the stored sewage is sucked into the vacuum pipe 40.

The vacuum conduit 40 includes descending slope portions (hereinafter referred to as forward slope portions) 41a to 41f and lift portions 42a to 42e. The forward gradient portions 41a to 41f and the lift portions 42a to 42e are alternately arranged. Between the lift part 42b and the lift part 42e, it is ascending as a whole, and a water block tends to occur as shown in the figure. A check valve 43 is provided in the forward gradient portion 41b adjacent on the upstream side of the lift portion 42b. A vacuum pressure recovery device 100 is connected between the check valve 43 and the lift portion 42b.

  As will be described in detail later, when the pressure in the vacuum line 40 increases, the vacuum pressure recovery device 100 introduces air into the vacuum line 40 to reduce the pressure and recover the vacuum. It is desirable that the vacuum pressure recovery device 100 be connected to the upstream side of the section where the water block is likely to occur. In FIG. 1, the vacuum pressure recovery apparatus 100 is connected to the point A at such a position. Furthermore, as shown in FIG. 1, it is desirable to install a check valve 43 upstream of the connection location of the vacuum pressure recovery device 100. By so doing, the pressure upstream of the check valve 43 does not increase due to the introduction of air by the vacuum pressure recovery device 100. The vacuum pressure recovery device 100 is provided to maintain the pressure of the entire vacuum line 40, and therefore, in FIG. 1, the vacuum sewer system 10 is illustrated as including one vacuum pressure recovery device 100. ing. However, a plurality of vacuum pressure recovery devices 100 may be provided, and the number of vacuum pressure recovery devices 100 may be set according to the scale of the vacuum sewer system 10. For example, the vacuum pressure recovery device 100 may be provided for each section of the vacuum line 40 that is partitioned by a check valve.

  The vacuum line 40 is connected to the vacuum station 50 on the downstream side. The vacuum station 50 includes a water collection tank 51 and a vacuum pump 52. The sewage transported through the vacuum pipe 40 is temporarily stored in the water collection tank 51 and sent to a sewerage treatment facility or the like. The vacuum pump 52 sucks the air in the vacuum line 40 and maintains the inside of the vacuum line 40 at a predetermined pressure. The vacuum pump 52 is operated so that the pressure in the vacuum line is, for example, −7 mAq to −6 mAq.

  Assuming that the height difference h between the upstream end of the lift portion 42b and the downstream end of the lift portion 42e is 3 m, as shown in FIG. 1, the calculation results in a pressure of −7 + 3 = −4 mAq at the point A. . However, when air flows in from the vacuum valve units 20a to 20c, it becomes higher than −4 mAq. The pressure at the point A cannot be recovered because there is a large water block, and may be higher than the operating pressure of the vacuum valve (for example, -2 mAq). As a result, the vacuum valve cannot be operated and the vacuum valve unit may be submerged. For this reason, the vacuum pressure recovery apparatus 100 can be configured to introduce air for conveying sewage when the pressure at the point A is −4 mAq to −3 mAq, for example. In another example, air may be introduced when the pressure at the point A is −5 mAq to −3 mAq. In this way, sewage is prevented from staying in the lift parts 42b to 41f, and more stable sewage can be conveyed.

  FIG. 2 is an explanatory diagram showing a schematic configuration of the vacuum pressure recovery device 100. In the illustrated example, the vacuum pressure recovery device 100 is installed inside the manhole 70. The inside of the manhole 70 communicates with the outside atmosphere via an air intake pipe 75. However, the vacuum pressure recovery device 100 may be installed on the ground.

As shown in the figure, the vacuum pressure recovery device 100 includes a mechanical controller 110 (hereinafter simply referred to as the controller 110), an atmosphere release valve 130, a vacuum pressure relief valve 150, and a vacuum pressure accumulation tank 170. .
When a pressure equal to or lower than the first pressure P1 is provided, the atmosphere release valve 130 uses the pressure to open an air flow path for introducing air into the forward gradient portion 41b. Hereinafter, a specific configuration of the atmosphere release valve 130 will be described. A first chamber 132 and a second chamber 133 are formed inside the casing 131 of the air release valve 130. The first chamber 132 and the second chamber 133 are separated by a diaphragm 135. The first chamber 132 is formed with a hole 136 that allows communication between a third hole 119 of the controller 110 described later and the inside of the first chamber 132. The second chamber 133 is divided into a first portion 133a and a second portion 133b. The first portion 133a is formed with a hole portion 137 communicating with the atmosphere. A hole 138 communicating with the atmosphere is formed in the second portion 133b. The hole 138 is formed in a size that allows a large amount of air to be introduced into the second portion 133b in a short time. Further, an air inlet 139 is formed below the second portion 133b so as to communicate with the forward gradient portion 41b of the vacuum pipe 40 and introduce air into the forward gradient portion 41b. The path from the hole 138 through the second portion 133b to the air introduction port 139 forms an air circulation path for introducing air into the forward gradient portion 41b.

  The second chamber 133 is provided with a first valve body 142 connected to the diaphragm 135. The first valve body 142 opens and closes the air introduction port 139. The first chamber 132 is provided with a spring 141 as a biasing unit that biases the diaphragm 135 toward the air introduction port 139. By this spring 141, the first valve body 142 is urged in a direction to close the air inlet 139. When the first valve body 142 is in a position to close the air inlet 139, the diaphragm 135 is adsorbed by a magnetic force to a magnet 143 as an adsorbing portion that adsorbs the diaphragm 135. The magnet 143 is provided on a support stage in which the inner surface of the casing 131 protrudes inward in the circumferential direction. In the present embodiment, the magnet 143 is formed in a ring shape, and the second chamber 133 is isolated into the first portion 133a and the second portion 133b in a state where the diaphragm 135 is attracted. At this time, both the first portion 133a and the second portion 133b communicate with the atmosphere through the holes 137 and 138. For this reason, the pressure inside the first portion 133a and the second portion 133b is always equal to the atmospheric pressure.

  In the atmosphere release valve 130, when the pressure in the first chamber 132 is higher than the first pressure P1, in other words, the pressure difference between the first chamber 132 and the second chamber 133 is less than the first threshold value TH1. In this case, the first valve body 142 is maintained at a position where the air inlet 139 is closed by the biasing force of the spring 141 and the attractive force of the magnet 143. On the other hand, when the pressure in the first chamber 132 becomes equal to or lower than the first pressure P1, the force acting on the diaphragm 135 due to the pressure difference between the first chamber 132 and the second chamber 133 is applied to the biasing force of the spring 141 and the adsorption of the magnet 143. Greater than force. As a result, the diaphragm 135 moves in the direction in which the volume of the first chamber 132 is reduced. As a result, the first valve body 142 connected to the diaphragm 135 also moves, the air introduction port 139 is opened, and air is introduced into the forward gradient portion 41b.

  The controller 110 distributes the vacuum pressure for providing the atmospheric release valve 130 with the pressure obtained based on the pressure in the forward gradient portion 41b when the pressure in the forward gradient portion 41b rises to the second pressure P2 or higher. Open the flow path. In other words, the controller 110 has a function of controlling the pressure in the first chamber 132 of the atmosphere release valve 130. Hereinafter, a specific configuration of the controller 110 will be described. Inside the casing 111 of the controller 110, a third chamber 112, a fourth chamber 113, and an internal flow path 127 are formed. The third chamber 112 and the fourth chamber 113 are separated by a diaphragm 114. A hole 115 is formed in the third chamber 112. The hole 115 communicates with the forward gradient portion 41 b through the pipe 181. A hole 116 is formed in the fourth chamber 113, and the fourth chamber 113 communicates with the atmosphere through the hole 116. The third chamber 112 is provided with a spring 121 as urging means. One end of the spring 121 is fixed to the inner surface 111 a of the casing 111, and the other end is fixed to the diaphragm 114. A rod-shaped magnet 122 is provided inside the spring 121. One end of the magnet 122 is connected to the diaphragm 114 by a magnetic force, and the other end adsorbs the inner surface 111a. The spring 121 urges the diaphragm 114 in a direction from the third chamber 112 toward the fourth chamber 113.

A shaft 123 extending from the fourth chamber 113 toward the internal channel 127 is formed inside the fourth chamber 113. One end of the shaft 123 is fixed to the diaphragm 114, and the second valve body 123a is provided at the other end. The fourth chamber 113 is airtightly isolated from the internal flow path 127 by a partition wall 124 through which the shaft 123 passes. A spring 120 is provided outside the shaft 123. One end of the spring 120 is fixed to the diaphragm 114, and the other end is fixed to the partition wall 124. The spring 120 urges the diaphragm 114 in a direction from the fourth chamber 113 toward the third chamber 112.

  Partitions 125 and 126 through which the shaft 123 passes are formed in the internal flow path 127. The through holes of the partition walls 125 and 126 are formed in a size that can be closed by the second valve body 123a. A first hole 117 is formed outside the partition wall 126 (on the side opposite to the partition wall 125) in the internal channel 127. The first hole 117 communicates with the atmosphere. In the internal channel 127, a second hole 118 is formed between the partition wall 124 and the partition wall 125, and a third hole 119 is formed between the partition wall 125 and the partition wall 126. Yes. The second hole portion 118 communicates with the forward gradient portion 41b through the pipe 182. A vacuum pressure accumulation tank 170 is provided in the middle of the pipe 182. A check valve 160 is provided between the vacuum pressure accumulation tank 170 and the forward gradient portion 41b. The check valve 160 allows circulation only in the direction from the vacuum pressure accumulation tank 170 toward the forward gradient portion 41b. As a result, the lowest pressure of the forward gradient portion 41b is accumulated in the vacuum pressure accumulation tank 170. The third hole 119 communicates with the first chamber 132 via the pipe 183 and the hole 136 of the atmosphere release valve 130.

  When the pressure in the forward gradient portion 41b is lower than the second pressure P2, in other words, the controller 110 changes the pressure difference between the third chamber 112 and the fourth chamber 113 (the pressure difference between the forward gradient portion 41b and the atmosphere). ) Is larger than the second threshold value TH2, the force acting on the diaphragm 114 due to the pressure difference is larger than the biasing force of the spring 120, so that the magnet 122 is connected to the diaphragm 114 by a magnetic force as shown in FIG. Is in a state. The relationship between the first pressure P1 and the second pressure P2 is such that the second pressure P2 is lower than the first pressure P1. At this time, the 2nd valve body 123a exists in the position which closes the through-hole of the partition 125, and the 1st hole 117 and the 3rd hole 119 are connecting. The first hole 117 and the second hole 118 are not in communication. In such a state, the first chamber 132 of the atmosphere release valve 130 communicates with the atmosphere via the third hole 119 and the first hole 117. That is, the air inlet 139 is in a closed state.

  On the other hand, when the pressure in the forward gradient portion 41b becomes higher than the second pressure P2, that is, when the pressure difference between the third chamber 112 and the fourth chamber 113 becomes equal to or less than the second threshold value TH2, the diaphragm 114 is caused by the pressure difference. In addition, the force acting from the fourth chamber 113 toward the third chamber 112 is weakened. As a result, the diaphragm 114 moves in the direction from the third chamber 112 toward the fourth chamber 113. The shaft 123 is also moved by the movement of the diaphragm 114, and the second valve body 123 a closes the through hole of the partition wall 126. As a result, the second hole 118 and the third hole 119 communicate with each other. At this time, the first hole 117 and the third hole 119 are not in communication. In such a state, the first chamber 132 of the atmosphere release valve 130 communicates with the vacuum pressure accumulation tank 170 through the third hole 119 and the second hole 118. That is, the pipe 182, the internal flow path 127, and the pipe 183 are obtained based on the pressure in the forward gradient portion 41 b (the pressure accumulated in the vacuum pressure accumulation tank 170 or the pressure in the forward gradient portion 41 b itself). Is formed in the first chamber 132 of the atmosphere release valve 130. For this reason, when the pressure below the 1st pressure P1 is accumulate | stored in the vacuum pressure accumulation tank 170, the air inlet 139 will be in the open state.

In this way, the atmosphere release valve 130 switches the communication state between the first hole 117 and the second hole 118 and the third hole 119, thereby the air of the atmosphere release valve 130. The opening / closing state of the introduction port 139 is switched. The magnet 122 described above increases the speed when the second valve body 123a opens the air inlet 139, and contributes to shortening of the switching time. Thus, a large amount of air can be introduced into the forward gradient portion 41b in a short time.

  The air inlet 139 is opened and air is introduced into the forward gradient portion 41b. After a predetermined time has passed by the vacuum relief valve, the air inlet 134 is closed. As a result, when the pressure of the forward gradient portion 41b recovers to a predetermined value, that is, when the pressure difference between the third chamber 112 and the fourth chamber 113 increases to a predetermined value, the fourth chamber is caused to enter the diaphragm 114 by the pressure difference. Since the force acting from 113 to the third chamber 112 increases, the shaft 123 is returned in the direction from the fourth chamber 113 to the third chamber 112, and returns to the closed position shown in FIG. The pressure difference between the third chamber 112 and the fourth chamber 113 for returning to the closed state is larger than the second threshold value TH2. For this reason, after the pressure of the forward gradient part 41b is recovered, the communication state between the first hole 117 and the second hole 118 and the third hole 119 can be switched. Further, chattering of the shaft 123 can be prevented by the spring 120.

  In the vacuum pressure recovery apparatus 100, a pipe 184 is connected in the middle of the pipe 183 that communicates the third hole 119 and the first chamber 132 of the air release valve 130. Connected to the pipe 184 is a vacuum relief valve 150 as an embodiment of an atmosphere introduction unit for communicating the pipe 183 and the atmosphere and gradually introducing air into the pipe 183. The vacuum relief valve 150 is always open, and always connects the pipe 183 and the atmosphere. The degree of opening of the vacuum relief valve 150 is greater than the atmospheric pressure when the first chamber 132 communicates with the vacuum pressure accumulation tank 170 and the forward gradient portion 41b through the third hole 119 and the second hole 118. The first chamber 132 is low enough so that air can be gradually introduced into the first chamber 132. For this reason, the pressure in the first chamber 132 gradually increases, and when the pressure difference between the first chamber 132 and the second chamber 133 is reduced to a predetermined level, the urging force of the spring 141 is changed to a diaphragm by the pressure difference. The first valve element 142 returns to a position where the air inlet 139 is closed. The closing operation of the atmosphere release valve 130 is performed regardless of the communication state between the first hole 117 and the second hole 118 and the third hole 119 in the controller 110. That is, the atmospheric release valve 130 is closed after a certain amount of time has elapsed from the opening operation, regardless of whether or not the pressure in the forward gradient portion 41b has been recovered. With such a configuration, the air inlet is not continuously opened until the pressure is recovered, so that it is possible to suppress the system from being down due to excessive air in the vacuum line.

  FIG. 3 is an explanatory diagram showing the relationship between the pressure of the forward gradient portion 41b and the operation of the controller 110 and the atmosphere release valve 130. When the pressure in the forward gradient portion 41b is equal to or lower than the pressure P2 (= −TH2), the controller 110 connects the first hole 117 and the third hole 119, that is, the first chamber 132 and the atmosphere. Since communication is established, the atmosphere release valve 130 is closed. From this state, when the pressure in the forward gradient portion 41 b increases and the pressure becomes equal to or higher than the pressure P 2, the controller 110 connects the second hole 118 and the third hole 119, that is, the first chamber 132. Since the forward gradient portion 41b (directly, the vacuum pressure accumulation tank 170) is communicated, the atmosphere release valve 130 is opened. Since a pressure lower than the pressure P2 is accumulated in the vacuum pressure accumulation tank 170, even if the pressure in the forward gradient portion 41b suddenly increases to a pressure higher than the pressure P1 (= −TH1), the first chamber 132 and The pressure difference from the second chamber 133 (under atmospheric pressure) is not less than the first threshold value TH1. For this reason, the air release valve 130 is opened when the pressure of the forward gradient portion 41b is higher than the pressure P1 (not shown in FIG. 3). According to such a configuration, even when the pressure in the forward gradient portion 41b suddenly rises, the atmosphere release valve 130 is opened at least once to introduce air into the forward gradient portion 41b and attempt to recover the pressure. . Even when a foreign object is clogged in the vacuum line 40, the pressure in the vacuum line 40 may increase rapidly, so this configuration works effectively.

If the pressure in the forward gradient portion 41b does not recover after the air release valve 130 is opened and closed once, the pressure in the vacuum pressure accumulation tank 170 has already been consumed, so as shown in FIG. Only when the pressure of the gradient portion 41b is not less than the pressure P2 and not more than the pressure P1, the atmosphere release valve 13 is used.
If 0 opens again and is lower than pressure P2 or higher than pressure P1, it does not open. According to such a configuration, when the pressure of the forward gradient portion 41b is excessively high, it is possible to further suppress the occurrence of system down by introducing air into the forward gradient portion 41b.

B. Variations:
B-1. Modification 1:
In the vacuum pressure recovery apparatus 100, the vacuum pressure accumulation tank 170 may be omitted. With this configuration, the configuration of the vacuum pressure recovery device 100 can be simplified. In this case, the relationship between the pressure of the forward gradient portion 41b and the operation of the controller 110 and the atmosphere release valve 130 is as shown in FIG. That is, when the pressure in the forward gradient portion 41b is higher than the pressure P1, the atmosphere release valve 130 is not opened and air is not introduced into the forward gradient portion 41b. For this reason, it is possible to reliably prevent the system from going down.

B-2. Modification 2:
The attracting part that attracts the diaphragm 135 is not limited to the magnet 143, and may be composed of various materials. For example, a hook-and-loop fastener or a resin suction cup may be used. Further, the adsorption unit may adsorb the first valve body 142 instead of adsorbing the diaphragm 135. For example, a configuration may be adopted in which a ring-shaped magnet is arranged around the air inlet 139 and the first valve body 142 is attracted to the magnet in a state of closing the central hole of the magnet.

B-3. Modification 3:
The air introduction part for gradually introducing air into the pipe 183 is not limited to the vacuum relief valve 150 and can be realized in various forms. For example, the atmosphere introduction part may be an orifice provided in the middle of the pipe 184 and communicating with the atmosphere. Alternatively, the air introduction part may be a hole formed in the pipe 184.

B-4. Modification 4:
The specific configuration of the vacuum pressure recovery device 100 described above is merely an example, and the specific configurations of the controller 110 and the atmosphere release valve 130 can be realized by arbitrarily combining known mechanical elements.

  The embodiments of the present invention have been described above based on some examples. However, the above-described embodiments of the present invention are for facilitating the understanding of the present invention and limit the present invention. It is not a thing. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof. Moreover, in the range which can solve at least one part of the subject mentioned above, or the range which exhibits at least one part of an effect, the combination of each component described in the claim and the specification, or omission is possible. .

DESCRIPTION OF SYMBOLS 10 ... Vacuum sewer system 20a, 20b, 20c ... Vacuum valve unit 40 ... Vacuum pipe line 41a-41e ... Forward gradient part 42a-42e ... Lift part 43 ... Check valve 50 ... Vacuum station 51 ... Catchment tank 52 ... Vacuum pump 70 ... Manhole 75 ... Air intake pipe 100 ... Vacuum pressure recovery device 110 ... Controller 111 ... Casing 111a ... Inner surface 112 ... Third chamber 113 ... Fourth chamber 114 ... Diaphragm 115, 116 ... Hole 117 ... First hole 118 ... Second hole 119 ... Third hole 127 ... Internal flow path 120, 121 ... Spring 122 ... Magnet 123 ... Shaft 123a ... Second valve body 124,125,126 ... Branch wall 130 ... Atmospheric release valve 131 ... Casing 132 ... First chamber 133 ... Second chamber 133a ... First part 133b ... Second part 135 ... Diaphragms 136, 137, 138
DESCRIPTION OF SYMBOLS 138 ... Hole part 139 ... Air introduction port 141 ... Spring 142 ... 1st valve body 143 ... Magnet 150 ... Vacuum relief valve 160 ... Check valve 170 ... Vacuum pressure accumulation tank 181,182,183,184 ... Piping

Claims (9)

A vacuum pressure recovery device for recovering the pressure in a vacuum pipe in a vacuum sewer system,
When a pressure equal to or lower than the first pressure is provided, the first valve body moves using the pressure to open an air flow path for introducing air into the vacuum line, and the provided An atmospheric release valve that returns the moved first valve body and closes the air flow path when the pressure increases to a predetermined pressure;
A vacuum pressure flow path connected to the vacuum line and the atmosphere release valve for providing the atmosphere release valve with a predetermined pressure obtained based on the pressure in the vacuum line;
When the pressure in the vacuum line rises to a second pressure or higher, the second valve element moves using the increase in pressure to open the vacuum pressure flow path, and A mechanical controller configured to return the moved second valve body and close the vacuum pressure flow path when the pressure in the vacuum line that has risen above the pressure drops to a predetermined pressure;
An air introduction part that is provided in the middle of the vacuum pressure flow channel and communicates with the atmosphere, and gradually introduces air into the vacuum pressure flow channel, and is provided in the vacuum pipe provided to the atmosphere release valve. A vacuum pressure recovery device comprising an air introduction part for gradually increasing the pressure of the air. The vacuum pressure recovery device according to claim 1,
The second pressure is lower than the first pressure. The vacuum pressure recovery device according to claim 2,
The atmosphere release valve includes an adsorbing portion that adsorbs the first valve body or a member connected to the first valve body when the first valve body is in a position to close the air flow path. Vacuum pressure recovery device. The vacuum pressure recovery device according to any one of claims 1 to 3,
In the middle of the vacuum pressure flow channel,
A vacuum pressure accumulation tank for accumulating pressure in the vacuum line;
A check valve provided between the vacuum pressure storage tank and the vacuum pipe, the check valve allowing flow only in the direction from the vacuum pressure storage tank to the vacuum pipe,
The vacuum pressure accumulation tank and the check valve are provided at a position where the communication state between the vacuum pressure accumulation tank and the check valve and the vacuum pipe is not closed by the movement of the second valve body. Vacuum pressure recovery device. The vacuum pressure recovery device according to any one of claims 1 to 3,
A vacuum pressure recovery device in which a vacuum pressure accumulation tank for accumulating pressure in the vacuum pipe is not provided in the middle of the vacuum pressure flow path. The vacuum pressure recovery device according to any one of claims 1 to 5,
The atmosphere release valve includes a first chamber that is isolated by a diaphragm and is provided with the predetermined pressure, and a second chamber that communicates with the atmosphere,
The second chamber is formed with an air inlet for introducing air into the vacuum line through the second chamber as a part of the air flow path.
The first valve body is connected to the diaphragm in the second chamber, and is urged to close the air inlet,
When the pressure below the first pressure is provided to the first chamber, the air release valve is configured such that the first valve body is caused by the pressure difference between the first chamber and the second chamber. A vacuum pressure recovery device configured to move to the position where the inlet is opened. The vacuum pressure recovery device according to claim 6,
Inside the mechanical controller, there is formed an internal flow path that becomes part of the vacuum pressure flow path between the vacuum line and the atmosphere release valve,
The mechanical controller includes
A first hole for communicating the internal flow path with the atmosphere;
A second hole for communicating with the vacuum pressure flow path between the vacuum line and the mechanical controller;
A third hole for communicating with the vacuum pressure flow path between the atmosphere release valve and the mechanical controller is formed,
The second valve body is
The first hole and the third hole are communicated with each other, and are urged to a position where the second hole and the third hole are not communicated.
When the pressure in the vacuum line rises above the second pressure, the change in the pressure is used to connect the second hole and the third hole, and the first A vacuum pressure recovery device that opens the vacuum pressure flow passage by moving to a position where the first hole and the third hole are not communicated with each other.   A vacuum sewer system comprising the vacuum pressure recovery device according to any one of claims 1 to 7. A vacuum pressure recovery method for recovering the pressure in a vacuum line without power in a vacuum sewer system,
When the pressure in the vacuum line rises above the second pressure, the second valve element is moved using the rise in pressure to obtain a predetermined pressure based on the pressure in the vacuum line Open the vacuum pressure flow channel to provide
A pressure equal to or lower than the first pressure is provided to the atmosphere release valve that opens and closes an air flow path for introducing air into the vacuum line through the opened vacuum pressure flow path, and the pressure is used. Moving the first valve body included in the atmosphere release valve to open the air flow path,
A pressure which is provided in the middle of the vacuum pressure flow path and gradually introduces air into the vacuum pressure flow path from an air introduction portion communicating with the atmosphere, and is a pressure equal to or lower than the first pressure provided to the atmosphere release valve. The vacuum pressure recovery method in which the air flow path is gradually raised and the air release valve is closed by the air release valve.

Images