JP6574358B2 - Governor equipment - Google Patents

Description

  The present invention relates to a governor device that is provided in the middle of a gas passage and smoothes the flow rate of gas.

  The conventional governor device includes a diaphragm for receiving the pressure of the gas in the gas passage. This diaphragm is configured to expand outward when the gas pressure increases. However, since the diaphragm is in the form of a rubber thin film, if it is torn or cracked, the gas in the gas passage leaks to the outside, so the outside of the diaphragm is covered with a cover. If the outside of the diaphragm is completely covered with this cover, the space surrounded by the diaphragm and the cover is sealed, and when the diaphragm is bent, the space is sealed, so that the bending is hindered. Is done. For this reason, a vent hole is formed which communicates the space surrounded by the diaphragm and the cover to the outside (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2001-124311 (FIG. 4)

  In the above conventional governor device, the vent hole is formed in the cover. However, the vent hole is not simply formed in the cover, but is formed in a cylindrical shape protruding outward from the cover. For this reason, protrusions are formed on the cover, and the storage space of the governor device increases.

  If the diaphragm is damaged as described above, the gas leaks to the outside through the vent hole, so the diameter of the vent hole is determined by the standard. And since the standard regarding the diameter of the vent hole differs in each country, when using it in a plurality of countries, a problem arises that a cover must be formed for each country.

  In view of the above problems, an object of the present invention is to provide a governor device in which the storage space of the governor device does not increase in size and the cover can be generalized.

In order to solve the above-mentioned problems, a governor device according to the present invention is provided in the middle of a gas passage and has a flexible diaphragm having a front surface facing the gas in the gas passage and a rear surface facing the outside of the gas passage. And a cover that covers the back side of the diaphragm, and a pressure adjusting spring that biases the back side of the diaphragm toward the front side, and a pressure adjusting screw that sandwiches the pressure adjusting spring with the diaphragm is screwed into the cover. The urging force of the pressure adjusting spring against the diaphragm can be varied by advancing and retracting the pressure adjusting screw by rotating the pressure adjusting screw by engaging a tool in a groove provided on the outer end of the pressure adjusting screw . in governor possible, a vent hole for communicating the space surrounded by the above cover and the diaphragm to the outside, provided in the pressure regulating screw so that the different positions between the groove and the vent hole A position enters a predetermined distance from the opening portion to the diaphragm side to the outside, and characterized by forming a narrow aperture portion than the inner diameter of the opening portion, and the flow rate of gas through the vent hole so as to regulate in this aperture portion To do.

  A vent hole was provided in the pressure adjusting screw instead of the cover. As a result, the cover can be generalized. Further, the cylindrical projection for the vent hole does not protrude from the cover.

When a tool or the like collides with the vent hole and deforms, the flow rate of the gas passing through the vent hole changes. Therefore, a position that has entered a predetermined distance from the opening portion to the diaphragm side to the outside of the vent hole, and a narrow aperture portion than the inner diameter of the opening portion, regulate the flow rate of gas through the vent hole in the diaphragm portion .

  In addition, in order to fix the position of the pressure adjusting screw, a liquid locking agent is applied to the screwed portion with respect to the cover, and the opening portion to the outside of the vent hole is made higher than the application position of the locking agent. The inflow of the locking agent into the vent hole may be prevented.

  As is clear from the above description, in the present invention, when it is necessary to manufacture a plurality of models having different vent hole diameters, it is only necessary to generalize the cover and replace only the pressure adjusting screw. Further, since it is not necessary to provide a cylindrical protrusion on the cover in order to provide the vent hole, the storage space of the governor device does not increase.

Sectional view showing structure of governor device The figure which shows the modification of the pressure regulation screw

  Referring to FIG. 1, reference numeral 1 denotes an example of a governor device according to the present invention, which allows gas introduced into a primary chamber 11 to flow out from a secondary chamber 12 to the outside. The primary chamber 11 and the secondary chamber 12 communicate with each other through a valve port 13, and the gas in the primary chamber 11 flows to the secondary chamber 12 side through the valve port 13.

  A valve shaft 21 is inserted through the valve port 13, and a valve body 2 is provided at the end of the valve shaft 21 on the secondary chamber 12 side. Therefore, when the valve shaft 21 moves upward in the drawing and the valve body 2 approaches the valve port 13, the opening degree of the valve port 13 decreases and the flow rate of the gas flowing into the secondary chamber 12 decreases. On the other hand, when the valve shaft 21 moves downward and the valve element 2 moves away from the valve port 13, the opening of the valve port 13 increases and the flow rate of the gas flowing into the secondary chamber 12 increases.

  The valve shaft 21 is urged upward and is in contact with the central portion of the diaphragm 3 located at the top. The outside of the diaphragm 3 is covered with a cover 14, and a pressure adjusting screw 5 is screwed to a screw portion 15 a formed on the inner surface of a cylindrical portion 15 formed on the cover 14. A pressure adjusting spring 4 is disposed between the pressure adjusting screw 5 and the diaphragm 3.

  A biasing force that biases the valve shaft upward acts on the diaphragm 3 from below, and a biasing force of the pressure adjusting spring 4 acts on the diaphragm 3 from above, so that the diaphragm 3 is a position where two biasing forces from above and below are balanced. Held in.

  In this state, when gas is introduced into the primary chamber 11 from the outside, the diaphragm 3 bends upward under the pressure of the gas in the primary chamber 11. Then, although the balance of the two urging forces is lost, the urging force downward by the pressure adjusting spring 4 is increased by contracting the pressure adjusting spring 4, and the diaphragm 3 is held at a newly balanced position. In this state, the valve element 2 is not in contact with the valve port 13 and is opened. Therefore, a constant flow of gas flows into the secondary chamber 12 through the valve port 13.

  In this state, when the gas pressure in the primary chamber 11 rises, the diaphragm 3 expands further upward. Therefore, the valve shaft 21 moves upward, and the valve body 2 reduces the opening degree to the valve port 13. As a result, even if the pressure in the primary chamber 11 increases, the flow rate of the gas flowing into the secondary chamber 12 does not change. Conversely, when the pressure in the primary chamber 11 decreases, the diaphragm 3 is displaced downward, pushes down the valve shaft 21, and releases the valve body 2 from the valve port 13 to increase the opening of the valve port 13. As a result, the gas flow rate to the secondary chamber 12 does not change.

  Thus, even if the pressure of the gas in the primary chamber 11 fluctuates, the flow rate of the gas to the secondary chamber 12 is kept constant by moving the diaphragm 3 up and down. The flow rate can be adjusted by the biasing force of the pressure regulating spring 4.

  Before the governor device 1 is incorporated into the gas appliance, the pressure adjusting screw 5 is moved up and down to adjust the flow rate to the secondary chamber 12 to a desired flow rate. This adjustment is performed by an automatic machine. A groove 51 is provided in the head of the pressure adjusting screw 5. The rotary tool T is automatically inserted into the groove 51, and the pressure adjusting screw is rotated so as to obtain a predetermined flow rate. The position of is adjusted. When the position of the pressure adjusting screw 5 is determined, a liquid locking agent is applied to the position indicated by A so that the position of the pressure adjusting screw 5 does not shift. This locking agent is for curing after application to prevent the pressure adjusting screw 5 from rotating.

  By the way, since the outside of the diaphragm 3 is covered with the cover 14 as described above, when the space surrounded by the diaphragm 3 and the cover 14 is completely sealed, the vertical direction of the diaphragm 3 is caused by the pressure of the trapped air. Movement is inhibited. For this reason, it is necessary to communicate the space surrounded by the diaphragm 3 and the cover 14 to the outside.

  In the present invention, a vent hole 52 for the communication is formed in the pressure adjusting screw 5. The vent hole 52 may be a relatively large hole if it only needs to fulfill the function of communicating the space surrounded by the diaphragm 3 and the cover 14 to the outside. In this case, the gas leaking through the damaged portion is released from the vent hole 52 to the outside.

  Therefore, it is necessary to reduce the outflow of gas by reducing the inner diameter of the vent hole 52 within a range that does not hinder the communication function. Therefore, in the present embodiment, the throttle portion 53 is provided at the lower end portion of the vent hole 52. The throttle portion 53 may be provided at an intermediate position of the vent hole 52. However, if the throttle portion 53 is provided at the upper opening portion of the vent hole 52, the rotary tool T or the other object collides with the upper opening portion of the vent hole 52 and When the shape of the opening 52 is changed, there is a possibility that the aperture amount changes. Therefore, it is desirable to provide the throttle 53 at a position moved downward from the upper opening portion of the vent hole 52.

  Further, if the locking agent flows into the vent hole 52 when applying the locking agent, the vent hole 52 may be blocked. Therefore, as shown in FIG. 2A, an upper surface portion 54 that is one step higher than the portion A where the locking agent is applied is provided, and a vent hole 52 and a groove 51 are provided in the upper surface portion 54.

  Alternatively, a small protrusion 55 may be provided and a vent hole 52 may be opened in the protrusion 55 as shown in FIG. Further, in the above embodiment, the governor device in which the diaphragm 3 is provided in the primary chamber 11 has been described, but when the diaphragm is provided on the secondary chamber side and the gas pressure in the secondary chamber decreases, the opening degree of the valve port The present invention may be applied to a governor device configured to keep the gas pressure in the secondary chamber constant by increasing the pressure.

  In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 1 Governor apparatus 2 Valve body 3 Diaphragm 4 Pressure regulating spring 5 Pressure regulating screw 11 Primary chamber 12 Secondary chamber 13 Valve port 14 Cover 21 Valve shaft 52 Vent hole 53 Restriction part

Claims (2)

A flexible diaphragm provided in the middle of the gas passage and having a front surface facing the gas in the gas passage and a rear surface facing the outside of the gas passage; a cover covering the rear side of the diaphragm; A pressure adjusting spring that biases the back side toward the front side is screwed into the cover with a pressure adjusting screw that sandwiches the pressure adjusting spring between the diaphragm, and the pressure adjusting screw is connected to the outer end of the pressure adjusting screw. A space surrounded by the cover and the diaphragm in a governor device capable of varying the urging force of the pressure adjusting spring against the diaphragm by rotating the pressure adjusting screw by engaging a tool with a groove provided in the groove. the vent hole communicating with the outside, provided in the pressure regulating screw so that the different positions between the groove and a predetermined distance from the opening portion to the outside of the vent hole in the diaphragm side Ri to elaborate position, to form a narrow aperture portion than the inner diameter of the opening portion, a governor device is characterized in that the flow rate of gas through the vent hole so as to regulate in this constricted portion. In order to fix the position of the pressure adjusting screw, a liquid locking agent is applied to the screwed portion with respect to the cover, and the opening to the outside of the vent hole is made higher than the application position of the locking agent to lock the screw. The governor device according to claim 1, wherein the agent is prevented from flowing into the vent hole.

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