JP5688269B2 - Check valve with orifice - Google Patents

Description

  The present invention relates to a check valve with an orifice in which an orifice that adjusts pressure and flow rate and a check valve that prevents backflow of fluid are integrated.

  Conventionally, an orifice that adjusts the pressure and flow rate and a check valve that prevents backflow of fluid are generally configured as independent components, for example, individually installed in a discharge pipe. This has been an obstacle to shortening the piping provided with the check valve.

  Therefore, the main body has an opening communicating with the fluid discharge side, a valve body capable of opening and closing the opening of the main body, and an elastic body when the valve body is biased to a closed position of the opening of the main body. In addition, a check valve (orifice check valve) in which a throttle portion (orifice) is integrally provided is developed (see Patent Document 1).

JP 2006-177167 A

  The check valve (check valve with orifice) described in Patent Document 1 is provided with a throttle portion (orifice) integrally on the inlet side, and therefore, compared with a case where the orifice and the check valve are separately connected, As a result, it can contribute to downsizing. However, a configuration that only requires gas to flow out to one side is adopted for gas, so that the pressure and flow rate on the discharge side can be easily changed according to the purpose, as in the case of liquid. It was n’t.

  That is, in the case of the check valve described in Patent Document 1, in order to change the pressure and flow rate on the discharge side without replacing the check valve itself, for example, a check valve (with an orifice) is used from a device such as a compressor. Take out the check valve), remove the retainer (C-ring) of the orifice part, pull out the part with the orifice from the orifice part, and then incorporate the part with the orifice of the desired diameter into the orifice part (C-ring) It is necessary to perform a complicated operation such as fixing with a screw and re-installing the device.

  Moreover, the check valve described in Patent Document 1 employs a structure that is attached to a part of the apparatus, for example, and is not structured to be attached in the middle of the pipe, and therefore can be used for a part of the pipe. In addition, since it is a dedicated part, it is generally difficult to incorporate it into piping.

  Furthermore, sudden pressure reduction with one orifice may cause cavitation and noise, which may cause problems. For this reason, it is easy to add an orifice to achieve sufficient pressure reduction and flow rate on the discharge side. It is desired to be able to narrow down. However, the check valve described in Patent Document 1 is considered to be difficult to meet such a request.

  The present invention has been made in view of the above circumstances, and the pressure and flow rate on the discharge side can be easily and easily changed by a relatively simple operation without replacing the valve itself. It is an object of the present invention to provide a check valve with an orifice that can be easily attached and added with an orifice.

The invention according to claim 1 incorporates a lid body having an orifice for adjusting pressure and flow rate on the fluid discharge side , a valve body, and an elastic body that biases the valve body in one direction. A casing is provided with a female screw part on the inner peripheral surface of the casing, a male screw part is provided on the outer peripheral surface of the lid, and the male screw part is screwed into the female screw part. , the lid is connected to the end of the casing, said valve body in said casing when connecting the lid to the end of the casing is configured to urge the lid, the The lid is configured to be removable from the casing via the male screw portion and the female screw portion, and the lid body is configured to be exchangeable with another lid body having orifices having different diameters. with orifice, characterized in that there It is a Ekki valve.

  As a result, the lid having the opening of the first diameter orifice connected to the casing through the threaded portion of the casing and the lid respectively screwed to each other is different from the first diameter. By exchanging with another lid having an orifice having a diameter of, the pressure and flow rate on the discharge side of the check valve with orifice can be easily and simply changed without replacing the entire valve.

  According to a second aspect of the present invention, there is provided the orifice according to the first aspect, wherein a valve seat that operates integrally with the valve body is detachably provided on the sealing surface of the valve body. This is a check valve.

  This makes it possible to improve the sealing performance of the valve body (valve seat) using a valve seat made of resin or rubber, for example, with excellent sealing performance, and it is possible to replace only the valve seat when the valve seat is worn. It becomes. In addition, by using a valve seat that can suppress the generation of noise, such as resin or rubber, it is possible to reduce the noise by reducing the operating noise when the valve is opened and closed.

  The invention according to claim 3 is characterized in that a screw hole for piping is formed in each of the casing and the opening end of the lid that opens to the outside when the lid is connected to the end of the casing. The check valve with an orifice according to claim 1 or 2.

  As a result, the casing is connected to one pipe via a pipe screw hole formed at the open end of the casing, and the lid is connected to the other pipe via a pipe screw hole formed at the open end of the lid. By doing so, the check valve with an orifice can be easily attached in the middle of the pipe to be a part of the pipe.

The invention according to claim 4 is the check valve with an orifice according to any one of claims 1 to 3, wherein an orifice is provided on an outlet side of the casing.
In this way, by providing an orifice on the outlet side of the casing, in response to a request to increase the number of orifices, for example, while suppressing the occurrence of cavitation, the pressure and flow rate on the discharge side of the check valve with an orifice can be further increased. It can be adjusted accurately.

  A fifth aspect of the present invention is a water supply apparatus comprising the pump and the check valve with an orifice according to any one of the first to fourth aspects attached to a discharge side pipe of the pump.

  In a water supply apparatus, in order to prevent an increase in water temperature during a shut-off operation, an orifice is widely attached to a discharge side pipe of a pump as a water temperature increase prevention escape device. Therefore, the check valve with an orifice according to any one of claims 1 to 4 is attached to a discharge side pipe of the pump, and the first diameter of the first check valve connected to the casing of the check valve with an orifice via a screw portion is provided. By simply replacing the lid with the orifice opened with another lid with an orifice having a second diameter different from the first diameter, the amount of water to be discharged can be easily adjusted.

  According to the check valve with an orifice of the present invention, the lid body in which the orifice having the first diameter connected to the casing is opened via the screw portions that are screwed to each other provided in the casing and the lid body. Easily change the pressure and flow rate on the discharge side of the check valve with an orifice without replacing the entire valve by replacing it with another lid that has an orifice with a second diameter different from the diameter of 1. can do.

It is a vertical front view of the check valve with an orifice of the embodiment of the present invention. It is a vertical front view of the check valve with an orifice of other embodiment of this invention. It is a vertical front view of the check valve with an orifice of other embodiment of this invention. It is a vertical front view of the check valve with an orifice of other embodiment of this invention. It is a vertical front view of the check valve with an orifice of the reference example of this invention. It is a figure which shows the state which attached the check valve with an orifice of embodiment of this invention to the discharge side piping of the pump of a water supply apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following examples, the same or corresponding members are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a longitudinal front view of an orifice check valve according to an embodiment of the present invention. As shown in FIG. 1, the check valve 10 with an orifice of this example is an abbreviation that forms a check valve between a lid body 20 having a through-hole penetrating in the flow direction (axial direction) and the lid body 20. It is mainly composed of a cylindrical casing 30.

On the inner peripheral surface on the inlet side along the flow direction of the lid 20, a pipe thread portion 21 used for connection with the pipe is formed, and on the inner peripheral surface on the outlet side along the flow direction, a flow path is formed. holes 22 are respectively provided, the pipe screw portion 21 and the flow path forming hole 22 are communicated with each other by an orifice 23 having a predetermined diameter (orifice diameter) D _a. As a result, a through hole is formed in the lid body 20, and the fluid that has flowed into the lid body 20 flows in the through hole of the lid body 20 along the flow direction and is discharged by passing through the orifice 23. The pressure and flow rate on the side are adjusted. For this reason, by using the lid 20 having the orifices 23 having different diameters (orifice diameters) D _A , that is, for example, the orifices 23 having a diameter (orifice diameter) D _A of D ₁ (D _A = D ₁ ). By replacing the lid body 20 with another lid body 20 having an orifice 23 with a diameter (orifice diameter) D _A of D ₂ (D _A = D ₂ , D ₁ ≠ D ₂ ), the pressure on the discharge side And flow rate changes.

  A flange 24 is provided at a predetermined position along the axial direction of the outer peripheral surface of the lid 20, and a male screw portion 25 is provided on the outer peripheral surface on the outlet side along the flow direction of the lid 20 with the flange 24 interposed therebetween. Is provided. Further, the outlet side end portion along the flow direction of the flow path forming hole 22 provided on the inner peripheral surface of the lid body 20 is a contact surface whose inner diameter gradually increases in a taper shape along the flow direction ( A sealing surface) 26 is formed.

  On the outlet side along the flow direction of the inner peripheral surface of the casing 30, a pipe thread portion 31 used for connection to the pipe is provided in communication with the circular storage section 32 along the flow direction. The inner peripheral surface on the inlet side is provided with a female screw portion 33 that is screwed with the male screw portion 25 provided on the outer peripheral surface on the outlet side along the flow direction of the lid body 20. Accordingly, the male screw portion 25 provided on the lid body 20 is screwed into the female screw portion 33 provided on the casing 30, thereby connecting the lid body 20 to the end portion of the casing 30, and to the casing 30 of the lid body 20. And the removal of the lid 20 from the casing 30 can be easily and simply performed through screw portions 25 and 33 which are screwed together. In this example, a packing 40 that prevents fluid leakage is interposed between the flange 24 of the lid 20 and the end surface on the inlet side in the flow direction of the casing 30.

  In the housing portion 32 of the casing 30, a valve body 50 is located on the upstream side in the flow direction, and a spring is located on the downstream side to urge the valve body 50 toward the upstream side in the flow direction. Each elastic body 60 is housed, and the lid body 20 is connected to the end of the casing 30, thereby preventing the valve body 50 and the elastic body 60 from escaping. The valve body 50 includes a substantially columnar head portion 51 positioned on the upstream side in the flow direction, and a substantially cylindrical storage portion 52 that is positioned on the downstream side and stores the end of the elastic body 60. In this example, the head portion 51 and the storage portion 52 are connected by a cylindrical shaft portion 54 having openings 53 at four locations along the circumferential direction.

  A valve seat 80 made of, for example, rubber or resin is detachably attached to the upstream end surface along the flow direction of the head portion 51 of the valve body 50 by a washer 70 and a bolt 72. The upstream outer peripheral surface along the taper shape whose outer diameter gradually increases along the flow direction corresponding to the contact surface 26 provided on the downstream inner peripheral surface in the flow direction of the lid body 20. A contact surface (seal surface) 82 is formed.

  As a result, the pressure of the fluid flowing through the orifice 23 of the lid 20 and flowing downstream of the orifice 23 overcomes the elastic force of the elastic body 60 that urges the valve body 50 toward the upstream side in the flow direction. The flow path in the check valve with orifice 10 is opened, and the flow path in the check valve with orifice 10 is closed otherwise.

  That is, when the pressure of the fluid flowing into the downstream side of the orifice 23 overcomes the elastic force of the elastic body 60, the valve body 50 is pushed back by the flow of the fluid and retreats in the flow direction. A gap is formed between the abutment surface 82 of 80 and the abutment surface 26 of the lid body 20, and the fluid flowing into the downstream side of the orifice 23 is the opening 53 provided in the shaft portion 54 of the valve body 50. And flows out of the casing 30 to the outside. When the elastic force of the elastic body 60 overcomes the pressure of the fluid flowing into the downstream side of the orifice 23, the valve body 50 is pushed forward by the elastic force of the elastic body 60 and moves forward in the flow direction, and the valve seat 80. Is brought into contact (pressure contact) with the contact surface 26 of the lid 20, thereby closing the flow path in the check valve with orifice 10.

  The check valve with an orifice 10 having the above-described configuration includes the pipe thread portion 21 of the lid body 20 on the pipe located upstream in the flow direction and the pipe screw portion 31 of the casing 30 on the pipe located downstream in the flow direction. They are used in conjunction with each other. In particular, when a liquid is a target, it is possible to meet a demand for changing the discharge-side pressure and flow rate according to the purpose.

That is, in such a case, for example, the diameter D _A is different from the lid 20 having the orifice 23 having the diameter D _A of D ₁ attached to the end portion of the casing 30, for example, the diameter D _A is D ₂ (D ₁ ≠ D ₂ ) Prepare a new lid having an orifice, remove the lid 20 from the end of the casing 30, and then attach a new lid to the end of the casing 30. Can be changed. To remove the lid 20 from the end of the casing 30 and attach a new lid to the end of the casing 30, screw portions 25 and 33 that are screwed to each other provided on the lid 20 and the casing 30, respectively. This can be done easily and simply.

  In this example, the valve seat 80 is detachably attached to the upstream end surface along the flow direction of the head portion 51 of the valve body 50. As a result, when the liquid flows through the check valve 10 with an orifice, even if the contact surface (seal surface) 82 of the valve seat 80 is worn due to a foreign matter or the like, the worn valve seat 80 Can be easily replaced. In addition, by using a valve seat 80 made of, for example, resin or rubber, which has excellent sealing performance and suppresses the generation of noise, the sealing performance of the valve seat 80 is improved and the operating noise during opening and closing of the valve is reduced. Noise can be reduced.

  In addition, the pipe 30 is formed in one pipe through the pipe screw hole 31 formed on the downstream side in the flow direction of the casing 30, and the pipe screw hole 21 formed in the opening end on the upstream side in the flow direction of the lid body 20. By connecting the lid body 20 to the other pipe via each, the check valve with orifice 10 can be easily attached in the middle of the pipe to become a part of the pipe.

  In the above example, an example is shown in which the lid 20 having the orifice 23 therein is connected to the upstream end of the casing 30 in the flow direction, but the downstream end of the lid 20 in the flow direction is shown. You may make it perform the role as a cover body in the casing 30 side connected with.

  In addition, the amount of movement of the valve body 50 can be adjusted to reduce the pressure of the fluid flowing inside the check valve with orifice 10 or to adjust the flow rate. The movement amount of the valve body 50 is adjusted by (1) adjusting the position (length) of the contact surface (seal surface) 26 of the lid body 20 where the orifice 23 is opened. (2) Length of the valve body 50 (3) adjusting the elastic force (strength) of the elastic body 60. This is similar to the following examples.

FIG. 2: shows the longitudinal front view of the check valve with an orifice of other embodiment of this invention. The check valve with orifice 10a of this example is different from the check valve with orifice 10 shown in FIG. 1 in that a predetermined diameter is also provided on the outlet side of the casing 30, that is, between the pipe thread portion 31 and the storage portion 32 of the casing 30. lies in that an orifice 34 having a (orifice diameter) _{D B.} Thus, by providing the orifice 34 on the downstream side of the casing 30, the pressure and flow rate on the discharge side can be controlled accurately and easily by the two orifices 23 and 34.

  For example, by connecting a part having an orifice 23 in the same shape as the lid 20 to the upstream side in the flow direction of the lid 20 or the downstream side in the flow direction of the casing 30 of the check valve 10a with an orifice, 3 It is possible to add stages, four stages and orifices. As a result, it is possible to cope with the case where it is desired to further reduce the pressure or control the flow rate.

  FIG. 3 is a longitudinal front view of a check valve with an orifice according to still another embodiment of the present invention. The check valve with orifice 10b of this example is different from the check valve with orifice 10a shown in FIG. 2 in that an elbow-shaped flow path 35 that produces a 90 ° flow direction between the storage portion 32 in the casing 30 and the orifice. Is the point that formed. In this way, by forming the elbow-shaped flow path 35 inside the casing 30, the flow direction can be changed by 90 ° without using an elbow on the piping side, thereby making the piping space more compact. Can do.

FIG. 4: shows the longitudinal front view of the check valve with an orifice of other embodiment of this invention. The check valve with orifice 10c of this example is different from the check valve with orifice 10 shown in FIG. 1 in that the valve body 80 is not detachably provided on the head 51 of the valve body 50. A taper-shaped contact whose outer diameter gradually increases along the flow direction on the upstream end surface in the flow direction, corresponding to the contact surface 26 provided on the inner peripheral surface on the downstream side in the flow direction of the lid 20 The surface (seal surface) 51a is formed.
Thus, the structure can be simplified by directly providing the contact surface (seal surface) 51a on the head portion 51 of the valve body 50.

FIG. 5 shows a longitudinal front view of a check valve with an orifice according to a reference example of the present invention. The difference between the check valve with orifice 10d of this example and the check valve with orifice 10 shown in FIG. 1 is that, as a lid body 20, instead of the external thread portion 25 provided on the outer peripheral surface on the downstream side in the flow direction, downstream in the flow direction. A casing 30 having a female threaded portion 27 on the inner peripheral surface is used as a casing 30, and a male threaded portion 36 is provided on the outer peripheral surface on the upstream side in the flow direction instead of the female threaded portion 33 provided on the inner peripheral surface on the upstream side in the flow direction. The lid 20 is connected to the end of the casing 30 by screwing the female threaded portion 27 of the lid 20 into the male threaded portion 36 of the casing 30.

  In this manner, by providing one of the male screw portion and the female screw portion that are screwed together in the casing 30 and the other in the lid body 20, the lid body 20 can be attached to the end portion of the casing 30, or the end portion of the casing 30 can be provided. The lid 20 can be easily and simply removed from the screw via the screw portion.

FIG. 6 shows a main part of a water supply apparatus in which, for example , the check valve with an orifice 10 shown in FIG. 1 is installed. That is, the water supply apparatus has a pump 91 that operates in accordance with the driving of the motor 90, and the suction pipe 92 is connected to the suction port of the pump 91, and the discharge pipe 93 is connected to the discharge port. A check valve 94 and a gate valve 95 are interposed between the discharge port and the discharge pipe 93. Further, a drain pipe 96 is connected to the discharge side of the pump 91 to return water to the expelling water tank or the water receiving tank or to drain the water as it is. The drain pipe 96 and the check valve 10 with an orifice shown in FIG. A valve 97 is installed.

Instead of the orifice with check valve 10 shown in FIG. 1, it is of course possible to use any of the orifices with check valve 10a~10d shown in FIGS. 2-5.

  The check valve with an orifice of the present invention is attached mainly to a discharge side of a pump such as a water supply device or a fire extinguishing pump device. In order to prevent an increase in water temperature during a shutoff operation, a water supply device or a fire pump device is widely used to attach an orifice as a water temperature increase prevention escape device to the discharge side pipe. For this reason, as shown in FIG. 6, the check valve with orifice 10 of the present invention is installed in the drain pipe 96 on the discharge side of the pump 91, and the discharge is performed by replacing only the lid 20 as described above. By making it possible to easily change the pressure and flow rate on the side, the amount of escape water can be easily adjusted.

  Although one embodiment of the present invention has been described so far, it is needless to say that the present invention is not limited to the above-described embodiment, and may be implemented in various forms within the scope of the technical idea.

10, 10a, 10b, 10c, 10d Check valve with orifice 20 Lid 21 Piping thread 23 Orifice 25 Male thread 26 Contact surface (seal surface)
27 Female thread part 30 Casing 31 Piping thread part 33 Female thread part 34 Orifice 36 Male thread part 40 Packing 50 Valve body 51 Head 51a Contact surface (seal surface)
53 Opening 60 Elastic body 80 Valve seat 82 Contact surface (seal surface)

Claims (5)

A lid having an orifice for adjusting the pressure and flow rate on the fluid discharge side ;
A casing containing a valve body and an elastic body that biases the valve body in one direction,
A female screw part is provided on the inner peripheral surface of the casing, a male screw part is provided on the outer peripheral surface of the lid, and the male screw part is screwed onto the female screw part to thereby end the casing. Connecting the lid to the part,
The valve body in the casing is configured to urge toward the lid when the lid is connected to the end of the casing ,
The lid body is configured to be removable from the casing via the male screw portion and the female screw portion,
The check valve with an orifice, wherein the cover body is configured to be exchangeable with another cover body having orifices having different diameters .   2. The check valve with an orifice according to claim 1, wherein a valve seat that operates integrally with the valve body is detachably provided on the sealing surface of the valve body.   The screw hole for piping is formed in the opening end of the casing and the lid which are opened to the outside when the lid is connected to the end of the casing, respectively. Check valve with orifice.   The check valve with an orifice according to any one of claims 1 to 3, wherein an orifice is provided on an outlet side of the casing. A pump,
5. A water supply apparatus comprising the check valve with an orifice according to any one of claims 1 to 4, which is attached to a discharge side pipe of the pump.

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