JPH03296113A - Steam temperature/pressure reducing valve - Google Patents

Abstract

PURPOSE:To reduce the steam temperature/pressure in a simplified mechanism and at low cost by providing a temperature reducing means containing the cooled fluid supply ports at the primary side of a pressure reducing valve part, attaching a temperature-sensitive element between the cooled fluid supply ports and the pressure reducing valve part, and supplying a cooled fluid in response to the working state of the temperature-sensitive element. CONSTITUTION:A temperature reducing means 51 is provided at the primary side of a pressure reducing valve part 50, and the cooled fluid supply ports 6 - 11 are provided to the means 51. A temperature-sensitive element 29 is attached between the ports 6 - 11 and the part 50, and a cooled fluid is supplied in response to the working state of the element 29. Therefore, the steam reduced down to a prescribed temperature is also reduced down to a prescribed level of pressure at the part 50. The steam undergone the reduction of pressure is never overheated. Thus the temperature and the pressure of the steam can be effectively reduced in a simplified and inexpensive mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a steam temperature reducing and pressure reducing valve used to reduce the temperature and pressure of steam to a temperature and pressure suitable for usage conditions, and in particular to It relates to reducing the temperature to a desired value.

Generally, steam is generated as relatively high-pressure steam in a steam generation source such as a boiler, and is used after being reduced in pressure by a pressure reducing valve at the inlet side of various steam-using equipment depending on the purpose of use of the steam-using equipment. Due to its nature, high-pressure steam becomes superheated steam when the pressure is reduced, making it difficult to adjust the amount of heat transferred in steam-using equipment, and making uniform heat transfer impossible.

Prior Art Conventionally, a device was used in which a device was attached to the secondary side of a pressure reducing valve to directly spray pressurized spray water from a spray nozzle onto superheated steam and reduce the temperature to a predetermined temperature. This is done by placing a spray nozzle in the superheated steam passage on the secondary side of the pressure reducing valve, and installing a temperature sensor on the downstream side, so that the superheated steam reaches a predetermined temperature in response to the temperature detected by the temperature sensor. If the steam temperature drops too much, tighten the control valve and reduce the amount of water sprayed from the spray nozzle to recover the steam temperature. If the steam temperature rises, This measures the reduction in steam temperature by increasing the opening degree of the control valve and increasing the amount of water being sprayed.

Problems to be Solved by the Present Invention In the above-mentioned problems, a temperature detector that detects the temperature of reduced steam, a control valve that adjusts the opening degree according to the detected temperature, and a connection between the temperature sensor and the control valve. In addition, the temperature sensor had to be installed separately in the steam passage, and the control valve had to be installed in the spray water passage, respectively, resulting in a problem of increased equipment and construction costs.

Therefore, the technical problem of the present invention is to efficiently reduce the temperature and pressure of steam using a simple and inexpensive mechanism.

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned technical problems is to arrange a temperature reducing means on the primary side of the pressure reducing valve part, and to connect a cooling fluid inlet to the temperature reducing means. A temperature-responsive element is installed between the cooling fluid inlet and the pressure reducing valve portion, and the cooling fluid is injected according to the responsive state of the temperature-responsive element.

action The effect of the above technical means is as follows.

A cooling fluid is injected into the passing fluid, that is, the steam flowing into the pressure reducing valve section, by a temperature responsive element of the temperature reducing means arranged on the primary side of the pressure reducing valve section. The steam, which has been cooled to a predetermined temperature by injecting the cooling fluid, is reduced in pressure to a predetermined pressure in the pressure reducing valve section. Since the temperature of the steam before being depressurized by the pressure reducing valve is lowered to a predetermined temperature, the steam after being depressurized will not become superheated steam.

Effects of the invention Connection parts for connecting temperature detectors and control valves are no longer required.
It is possible to reduce the temperature and pressure of steam at low cost with a simplified mechanism.

Embodiment An embodiment illustrating a specific example of the above technical means will be described (see FIG. 1).

The pressure reducing valve section 50 and the temperature reducing means 51 arranged on the primary side of the pressure reducing valve section 50 form a steam temperature reducing pressure reducing valve.

The temperature reducing means 51 is formed by screwing the main body 1 and the lid 2 together via a gasket 30. The main body 1 is provided with a steam passage 5 that communicates the inlet 3 and the outlet 4, and a spray water passage 7 is provided on the inlet 3 side of the steam passage 50 with one end serving as a spray port 6, and the other end serving as a spray water inlet 8. A pressure relief valve port 9 is arranged between the port 6 and the spray water inlet 8. The spray water inlet 8 and the pressure relief valve port 9 are provided with threaded portions 10 and 11 for connecting a cooling fluid connection pipe (not shown) or a spray water pressure forming pipe (not shown). The above spray port 6, spray water oil passage 7, spray water inlet 8, pressure relief valve port 9, and threaded portions 10 and 11 form a cooling fluid inlet. Further, the spray water inlet 8 may be provided with an orifice 12 that is approximately equal in diameter to the spray port 6 in order to reduce fluctuations in the pressure of the spray water in the spray water passage 7 and maintain it approximately constant.

A hole is formed in the center of M2 on the pressure reducing valve part 50 side from the spray port 6. The hole has a small-diameter internal thread at the inner end, a cylindrical surface at the center, and a large-diameter front thread at the outer end. Adjustment rod 13,
A male thread is formed at its inner end and is screwed into the small diameter female thread of the lid 2. A washer 14 and a backing 15 are arranged between the cylindrical surface on the outer periphery of the adjustment rod 13 and the cylindrical surface at the center of the M2 hole, and the plug 16 is screwed into the large diameter front screw on the outer end of the lid 2. Lid 2
The gap between the hole and the adjustment rod 13 is airtightly sealed. Adjustment rod 1
A one-letter groove 17 is formed at the outer end of 3 for setting the steam temperature by moving the adjustment rod 13 up and down.

The male thread formed at the inner end of the adjusting rod 13 hits the washer 14 disposed inside the backing 15 at the outermost position of the stroke of the adjusting rod 13, so it does not bite into the packing 5. Insert the guide hole 18 into the adjustment rod 13 (from the inner end along the axis).
Form it. A cap nut 19 is screwed onto the male thread at the inner end of the adjustment rod 13.

The cap nut 19 forms a fixed partition with respect to the valve housing. A through hole smaller in diameter than the guide hole 18 is formed in the center of the cap nut 19. A sleeve 20 having a flange at one end is slidably fitted into the through hole with the flange facing the guide hole 18 side. The valve stem 21 is slidably fitted into the hole of the sleeve 20. The spring receiver forms a flange 22 at the end of the valve stem 21 located within the guide hole 18 . The spring receiver 7 flange 22 has a larger diameter than the valve stem 21 and slides into contact with the inner wall of the guide hole 18 . Both ends of the coiled return spring 23 are brought into contact with the lower end surface of the spring receiving flange 22 of the valve rod 21 and the upper end surface of the seven flange formed at the upper end of the sleeve 120, so that the valve rod 21 and the guide hole 18 are connected. Place it in between.

An auxiliary spring 24 is interposed between the upper end of the spring receiving flange 22 formed on the valve stem 21 and the inner wall of the guide hole 18. The spring force of the auxiliary spring 24 is weaker than that of the return spring 23.

The valve rod 21 airtightly passes through a through hole 25 in a wall separating the steam passage 5 and the spray water passage 7 of the main body 1 via an O-ring 26, and has a valve body at the end facing the pressure relief valve port 9. form 27.

A snap ring 28 is secured to the lower end surface of the sleeve 20 around the valve stem 21 and to the lower part of the valve stem 21 in the steam passage 5.
A temperature responsive element 29 is placed between them. Temperature responsive element 2
9 is a plurality of stacked pairs of disc-shaped bimetal plates with their lower expansion coefficient sides facing each other,
A valve rod 21 is passed through a hole formed in the center of each bimetal plate to form a laminated body. If the steam temperature further rises after the temperature-responsive element 29 has expanded and the valve body 27 has seated on the pressure relief valve port 9, the excess expansion of the temperature-responsive element 29 causes the sleeve 20 to further compress the return spring 23. It is absorbed by moving upward.

The spray port 6 may be formed integrally with the main body 1 as in this embodiment, or may be manufactured separately from the main body 1 and screwed onto it.

A pressure reducing valve section 50 is provided between the temperature reducing means 51 and the outlet 4,
Since this pressure reducing valve section 50 has substantially the same structure and function as a conventionally known pressure reducing valve, a detailed explanation as a pressure reducing valve will be omitted.

When using this steam temperature reducing pressure reducing valve, the pressure reducing valve part 50
The temperature reducing means 51 is adjusted so that the temperature of the steam flowing into the pressure reducing valve section 50 is lowered by a temperature corresponding to the pressure reducing ratio at. For example, when the steam pressure on the inlet 3 side is 10KG, the steam temperature is approximately 183°C, and the pressure reducing valve section 50 reduces the steam pressure to 5KG.
When trying to reduce the pressure to
Adjust.

The temperature-responsive element 29 swells due to the high-temperature steam flowing in from the inlet 3, and the valve body 27 throttles or closes the pressure relief valve port 9, so that the pressure inside the spray water passage 7 is reduced to a pressurized value. When the temperature approaches , a large amount of spray water is sprayed from the spray port 6 to reduce the steam temperature. On the other hand, when low-temperature steam flows in, the temperature-responsive element 29 contracts and the spray water passage 7 is closed in order to increase the opening degree of the pressure relief valve port 9.
The internal pressure decreases, the spray from the spray port 6 almost disappears, and the steam temperature recovers.

In this way, the present steam temperature reducing pressure reducing valve has a simplified mechanism by directly opening and closing the cooling fluid pressure relief valve port 9 using the valve body 27 connected to the temperature responsive element 29 and adjusting the amount of cooling fluid. The steam temperature can be lowered at low cost, the reduced pressure steam can be prevented from becoming overheated, and various steam-using devices can be heated uniformly.

In this embodiment, an example was shown in which the adjustment rod 13 of the temperature reduction means 51 is manually adjusted, but a drive means such as a motor is connected to this adjustment rod, and a Alternatively, by separately providing a temperature detection means on the secondary side of the pressure reducing valve section 50 and connecting it to the driving means, the temperature can be automatically controlled.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the steam temperature reducing pressure reducing valve of the present invention. 1: Main body 2: M 3: Inlet 4: Outlet 5: Steam passage 6: Sprayer 7: Spray water passage 8 Spray water inlet 9: Relief valve port 13
: Adjustment rod

Claims (1)

[Claims] 1. A temperature reducing means is arranged on the primary side of the pressure reducing valve part, a cooling fluid inlet is formed in the temperature reducing means, a temperature responsive element is installed between the cooling fluid inlet and the pressure reducing valve part, A steam temperature reducing pressure reducing valve that injects cooling fluid according to the response state of a temperature responsive element.