JP5575590B2 - Pressure reducing valve - Google Patents

Description

  The present invention relates to a pressure reducing valve which is a kind of valve device, and more particularly to a pressure reducing valve suitable for use in a water supply pipe. The pressure reducing valve of the present invention is used, for example, in a water supply portion of a humidifier for a total heat exchanger, or in a water supply portion of other equipment having a function of adjusting a fluid to a low pressure.

  Conventionally, for example, a pressure reducing valve used in a water supply section in a humidifier for a total heat exchanger is known, and FIG. 4 shows a circuit diagram of a humidifier including such a pressure reducing valve. In FIG. , A pressure reducing solenoid valve unit provided after piping the water supply solenoid valve 2, the pressure reducing valve 3, the safety valve 4 and the drainage electromagnetic valve 5 as shown in the figure, and numeral 6 indicates a humidifier.

  As shown in the figure, there are cases where a plurality of humidifiers (two in the figure) are used for one pressure reducing valve, and in this case, the required flow rate increases as the number of used humidifiers increases. Basically, the flow rate required for the humidifier is small, but when the number of humidifiers used is large and the flow rate is large, the pressure will be lower than the specified pressure reduction value, and a pressure reducing valve corresponding to the required flow rate value is required. Become.

Japanese Patent No. 3435740

  In view of the above points, the present invention requires a large amount of flow, and therefore, even when the diameter of the valve hole of the pressure reducing valve is set large in order to increase the flow rate, the pressure regulating shaft operates stably, and thus pressure is reduced with high accuracy. An object of the present invention is to provide a pressure reducing valve that can be used.

In order to achieve the above object, a pressure reducing valve according to claim 1 of the present invention is a pressure reducing valve used in a water supply pipe , wherein a valve case of the pressure reducing valve includes a primary port on the inflow side and a secondary port on the outflow side. The primary side port and the secondary side port are communicated with each other via a valve chamber, a valve hole and a diaphragm chamber provided in the valve case, and a pressure regulating diaphragm is provided inside the valve case. , pressure regulating a spring and the pressure reducing valve pressure regulating shaft is incorporated, the pressure regulating shaft, and the spring force of the adjusting spring which is arranged so as to oppose to the outflow side secondary pressure of the pressure reducing valve of by reciprocate is connected to the pressure regulating diaphragm that operates seeking equilibrium, the valve body forming part of the pressure regulating shaft to the valve seat portion provided in the opening edge of the valve hole toward and away from for So, the pressure regulating shaft, a lower shaft portion which is arranged on the opposite side of the valve body portion upper shaft portion disposed on the valve seat portion as the center in the axial direction of the valve seat portion coaxially has the upper shaft part is connected is inserted into the valve hole of the circumferential the valve seat portion to said pressure regulating diaphragm, the lower shaft portion with is connected to the valve body portion at the upper end thereof The valve seat portion is slidably inserted into a slide hole at a lower end portion, the tip of the valve seat portion is formed in a rounded shape having a round cross-section arc shape, the outer diameter of the lower shaft portion is a, the valve seat portion In this case, d <c and c <b and a = b are set, where b is the radius tip diameter, c is the inner diameter of the valve hole, and d is the outer diameter of the upper shaft portion.

  The pressure reducing valve according to claim 2 of the present invention is the pressure reducing valve according to claim 1, wherein the lower shaft portion is held by a bearing component that is installed in the slide hole and is separate from the valve case. It is characterized by being.

  The pressure reducing valve of the present invention having the above-described configuration senses a secondary pressure with a pressure adjusting diaphragm, and a pressure adjusting spring corresponding to the pressure set for the diaphragm is installed, and the pressure adjusting shaft of the pressure adjusting shaft interlocked with the fluctuation of the diaphragm is installed. It is a pressure reducing valve that can change the channel area by movement. In addition, the pressure reducing valve can accurately reduce the pressure by changing a part of the components without changing the basic structure.

  When the flow rate is large, the pressure reducing valve having this configuration changes in a direction in which the flow path area increases, and when the flow rate is low, the flow path area decreases. At that time, the flow rate is determined by the valve opening distance between the valve seat portion and the valve body portion corresponding to the flow passage cross-sectional area in the valve hole into which the upper shaft portion is inserted, but when the flow passage cross-sectional area is small, Even if the valve opening distance is increased, the flow rate is limited and the secondary pressure is also reduced.

  Therefore, as a countermeasure, the flow rate can be increased by increasing the inner diameter c of the valve hole. However, if the inner diameter c of the valve hole is simply increased, the secondary pressure becomes unstable. . This is because the outer diameter a of the lower shaft portion and the radius tip diameter b of the valve seat portion are set differently with respect to the primary pressure, and there is a pressure receiving area difference on the upper and lower surfaces of the valve body portion, thereby the pressure adjusting shaft This is because the position of is changed.

  Therefore, at this time, by adjusting the outer diameter a of the lower shaft portion to the radius tip diameter b of the valve seat portion by increasing the inner diameter c of the valve hole, there is no difference in pressure receiving area between the upper and lower surfaces of the valve body portion. By doing so, it is possible to suppress the movement of the pressure adjusting shaft due to the fluctuation of the primary pressure, and thus it is possible to solve the above problem (the secondary pressure is unstable).

  In addition, the lower shaft portion is configured to be slidably inserted into the slide hole at the lower end portion thereof. If there is a large radial play in the lower shaft portion, the smooth movement of the pressure adjusting shaft may be hindered.

  Therefore, in the present invention, the lower shaft portion is additionally held by a bearing component that is installed in the slide hole and separate from the valve case, and thus the lower shaft portion is held by a dedicated bearing component. Therefore, it was decided to ensure the smooth axial movement.

  The present invention has the following effects.

  That is, according to the present invention, the required flow rate is large, and therefore, even when the diameter of the valve hole of the pressure reducing valve is set large in order to increase the flow rate, the pressure regulating shaft operates stably, and therefore the pressure can be accurately reduced. A pressure reducing valve that can be provided can be provided. In addition, when the lower shaft portion of the pressure adjusting shaft is held by a dedicated bearing component, smooth axial movement can be ensured.

Sectional drawing of the pressure reducing valve which concerns on the Example of this invention Enlarged view of the main part in FIG. Further enlarged view of the main part in FIG. Circuit diagram of humidifier including pressure reducing valve

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a sectional view of a pressure reducing valve (diaphragm type pressure reducing valve) 11 according to an embodiment of the present invention. The pressure reducing valve 11 according to this embodiment is used to stabilize the outflow side secondary pressure in the water supply portion of the humidifier for the total heat exchanger, and is configured as follows.

  That is, first, the valve case 12 of the pressure reducing valve 11 is provided by watertightly combining four parts of the body 13, the cover 14, the upper cap (first cap) 15 and the lower cap (second cap) 16. In the valve case 12, operating parts such as a pressure adjusting diaphragm 25, a pressure adjusting spring 26, and a pressure adjusting shaft 31 are incorporated. The body 13 in the valve case 12 is provided with an inflow-side primary port 18 and an opposite-side outflow-side secondary port 19, and both ports 18, 19 are also provided in the body 13. The chamber 20, the valve hole 21, and the diaphragm chamber 22 communicate with each other.

  In the diaphragm chamber 22, a pressure adjusting diaphragm 25 is provided between the body 13 and the cover 14. The pressure regulating diaphragm 25 is used to obtain an equilibrium point between the secondary pressure of the pressure reducing valve 11 and the spring force of the pressure regulating spring (first spring) 26 arranged to oppose the pressure regulating valve 25, and its floating end portion is axial. A pressure adjusting shaft (also referred to as a shaft) 31 with a head is attached to the floating end of the pressure adjusting diaphragm 25, and the diaphragm retainer 27, the spring retainer 28 and the assembly are assembled. The nuts 29 are used for connection. The pressure adjusting spring 26 is elastically interposed between the upper cap 15 screwed into the cover 14 and the spring retainer 28, and the spring force can be adjusted by adjusting the screwing amount of the upper cap 15. .

  In the valve chamber 20, a valve seat portion 30 is provided downward at the lower peripheral edge portion of the valve hole 21, and a valve body portion 32 is provided upward below the valve seat portion 30. The valve seat portion 30 is formed in a round shape having a rounded cross section with an arc shape instead of a pointed tip (lower end).

  The valve body portion 32 is obtained by holding the valve body main body 33 by the valve body holder 34, and forms a part of the pressure adjusting shaft 31, that is, the pressure adjusting shaft 31 moves the valve body portion 32 in the middle in the vertical direction. An upper shaft portion (first shaft portion) 35 disposed on the valve seat 30 side (upper side) and a lower shaft portion (second shaft portion) 36 disposed on the opposite side (lower side) thereof. Are provided on the same axis.

  Of these, the upper shaft portion 35 is inserted into the valve hole 21 in a loosely fitted state and is connected to the pressure adjusting diaphragm 25 as described above, while the lower shaft portion 36 has a valve body portion 32 at its upper end. And is slidably inserted into a through hole-like slide hole 17 provided in the lower cap 16 at the lower end thereof.

  Further, the lower shaft portion 36 is slidable in the axial direction by an annular bearing part 37 made of a material such as a resin separate from the valve case 12 installed in the slide hole 17 and is free from radial backlash. Therefore, the smooth axial movement is ensured.

  A seal part 38 such as an O-ring that seals between the lower cap 16 and the lower shaft 36 is assembled to the lower side of the bearing part 37. A lower spring (second spring) 39 for elastically biasing the valve body portion 32 toward the valve seat portion 30 is assembled between the bearing part 37 and the valve body holder 34 of the valve body portion 32. ing.

  Furthermore, as shown in FIGS. 2 and 3, the pressure reducing valve 11 has an outer diameter dimension of the lower shaft portion 36, a rounded tip diameter dimension of the valve seat portion 30 b, and an inner diameter dimension of the valve hole 21 c. The outer diameter of the upper shaft portion 35 is d, d <c, c <b, and a = b.

  The pressure reducing valve 11 having the above configuration is used for stabilizing the secondary pressure on the outflow side in the water supply portion of the humidifier for the total heat exchanger as described above. For example, when the secondary pressure increases, the pressure regulating valve 11 Due to the balance with the spring 26, the floating end of the pressure adjusting diaphragm 25 rises, and the pressure adjusting shaft 31 rises accordingly, so that the valve body 32 approaches the valve seat 30 and the flow rate is reduced. The next pressure is reduced. On the contrary, when the secondary pressure decreases, the floating end of the pressure adjusting diaphragm 25 is lowered due to the balance with the pressure adjusting spring 26, and the pressure adjusting shaft 31 is lowered accordingly. 32 leaves | separates from the valve seat part 30, a flow volume is increased, and a secondary pressure is increased. Therefore, the secondary pressure can be made constant by such a pressure adjusting function.

  Further, as described above, the pressure reducing valve 11 configured as described above changes in the direction in which the flow path area increases when the flow rate is large, and decreases in the direction in which the flow path area decreases when the flow rate is small. At that time, the flow rate is determined by the valve opening distance ST between the valve seat portion 30 and the valve body portion 32 corresponding to the flow passage cross-sectional area in the valve hole 21 into which the upper shaft portion 35 is inserted. In the case of being small, even if the valve opening distance ST is increased, the flow rate is limited and the secondary pressure is also reduced.

  Therefore, as a countermeasure, the flow rate can be increased by increasing the inner diameter c of the valve hole 21, but if the inner diameter c of the valve hole 21 is simply increased, the secondary pressure is unstable. become. This is because the outer diameter a of the lower shaft portion 36 and the radius tip diameter b of the valve seat portion 30 are set differently with respect to the primary pressure, and there is a pressure receiving area difference between the upper and lower surfaces of the valve body portion 32. This is because the position of the pressure adjusting shaft 31 changes.

  Therefore, at this time, the outer diameter a of the lower shaft portion 36 is adjusted to the radius tip diameter b of the valve seat portion 30 by increasing the inner diameter c of the valve hole 21, that is, the valve body portion is set by setting a = b. 32 so that there is no pressure receiving area difference between the upper and lower surfaces, thereby suppressing the movement of the pressure adjusting shaft 31 due to fluctuations in the primary pressure.

  In addition, if the specification is made such that the inner diameter dimension c of the valve hole 21 is simply increased, it is possible to cover basically from a small flow rate to a large flow rate. In this case, since there is almost no valve opening distance ST between the valve seat portion 30 and the valve body portion 32, there is a possibility that the pressure reducing accuracy is lowered and dust is clogged.

  In general, the a-diameter shaft diameter and the O-ring diameter of the shaft sliding portion are determined as standard, so the b and c dimensions are inevitably determined. At that time, it is also possible to adjust the channel area by changing the dimension a.

DESCRIPTION OF SYMBOLS 11 Pressure reducing valve 12 Valve case 13 Body 14 Cover 15, 16 Cap 17 Slide hole 18 Primary side port 19 Secondary side port 20 Valve chamber 21 Valve hole 22 Diaphragm chamber 25 Pressure regulation diaphragm 26 Pressure regulation spring 27, 28 Retainer 29 Nut Reference Signs List 30 Valve seat part 31 Pressure regulating shaft 32 Valve body part 33 Valve body body 34 Valve body holder 35 Upper shaft part 36 Lower shaft part 37 Bearing part 38 Seal part 39 Lower spring

Claims (2)

In the pressure reducing valve used for the water supply pipe, the valve case of the pressure reducing valve is provided with an inflow side primary port and an outflow side secondary port, and the primary side port and the secondary side port are: A pressure reducing valve in which a pressure regulating diaphragm, a pressure regulating spring, and a pressure regulating shaft are incorporated in the valve case, and communicated via a valve chamber, a valve hole, and a diaphragm chamber provided in the valve case ;
The pressure regulating shaft, reciprocating is connected to the pressure regulating diaphragm that operates seeking equilibrium between the spring force of the adjusting spring which is arranged so as to oppose to the outflow side secondary pressure of the pressure reducing valve By doing so , the valve body part forming a part of the pressure adjusting shaft is moved closer to and away from the valve seat part provided at the opening peripheral part of the valve hole ,
The pressure adjusting shaft has an upper shaft portion disposed on the valve seat portion side and a lower shaft portion disposed on the opposite side of the valve seat portion on the same axis, with the valve body portion being the middle in the axial direction. ,
The upper shaft portion, is inserted into the valve hole of the circumferential the valve seat portion is connected to said pressure regulating diaphragm,
The lower shaft portion is connected to the valve body portion at an upper end portion thereof and is slidably inserted into a slide hole at a lower end portion thereof.
The valve seat portion is formed in a round shape with a rounded cross-sectional arc at its tip,
D <c and c <b, where a is the outer diameter of the lower shaft portion, b is the radius tip diameter of the valve seat portion, c is the inner diameter of the valve hole, and d is the outer diameter of the upper shaft portion. a pressure-reducing valve, wherein a = b. The pressure reducing valve according to claim 1,
The pressure reducing valve, wherein the lower shaft portion is held by a bearing component that is installed in the slide hole and is separate from the valve case.

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