CN108591813A - Differential pressure type steam trap - Google Patents

Abstract

A differential pressure steam trap disclosed by the invention aims to provide a steam trap that is not limited by structure, has small volume and large displacement, and can provide multiple installation methods. The present invention is achieved through the following technical solutions: the valve cover (1) is detachably fixedly connected to the inlet end of the valve body (2); a T-shaped air discharge valve (4) and its Gland (5), there is a free-moving metal valve piece (6) between the T-shaped air discharge valve and the gland; a tail seat plug (9) is fixedly connected to the opposite end face of the end face of the valve cover, and the valve body and The front cover (3) and the valve stem bushing (11) are fixedly connected to the tail seat plug respectively, and the valve disc (15) is installed on the two bushings and can move in a straight line. The middle part of the valve disc is fixedly connected with a A bowl-shaped slip ring (13). There is a compression spring between the bowl-shaped slip ring and the valve body. Sleeve (14).

Description

Differential Pressure Steam Traps

technical field

The invention relates to a steam trap widely used in petroleum, chemical industry, printing and dyeing, pharmaceutical, textile, food and other high and medium pressure steam equipment systems, especially for automatically discharging condensed water and non-condensed water from steam pipelines and steam using equipment. Valves for aggressive gases, mainly involving high-pressure, large-displacement steam traps.

Background technique

As the equipment used in industrial production steam system, steam trap plays a very important role in ensuring the safe, energy-saving and efficient operation of the process. The steam trap is used in the steam pipe network and equipment, which can automatically discharge condensed water, air and other non-condensable gases, and prevent the leakage of water steam. The basic function of the steam trap is to discharge the condensed water, air and carbon dioxide gas in the steam system as soon as possible; at the same time, it can automatically prevent the leakage of steam to the greatest extent. The purpose of installing steam traps on steam delivery pipelines is to prevent water hammer accidents caused by the accumulation of condensed water in steam delivery pipelines and to obtain dry saturated steam at the steam end. There are many types of drain traps, each with different capabilities. The condensed water produced in the process of steam transmission pipelines, steam using equipment, steam heating pipelines, etc. must be removed as soon as possible, otherwise, the high-speed flowing steam will push the condensed water accumulated together, making the condensed water on the pipe wall and Valves and steam equipment are subjected to strong impact, and the impact force is often very large. This phenomenon is called water hammer. When the water hammer is very strong, it will cause damage or destruction of pipe bends and valves. At the same time, the accumulation of condensed water in the equipment will greatly affect the heat exchange efficiency, and even cause the consequence that the heating process cannot be carried out. The function of the steam trap is to automatically eliminate the condensed water, air and other non-condensable gases that are continuously produced in the steam pipeline and equipment, and at the same time prevent the steam from escaping. It is an energy-saving product that ensures the effective operation of various steam equipment. .

According to the statistics of relevant departments in my country, there are about 4.324 million steam traps in the country at present, and about 80% of the products fail to meet the current national standard of less than 3% of the steam traps, and the leakage rate is mostly around 10%. There are many types of steam traps. According to different working principles, three types of steam traps are manufactured according to three principles. Steam traps are classified into mechanical, thermostatic, and thermodynamic types. Among them, the mechanical trap operates by changing the height of the condensate liquid in the steam trap, and uses the level of the condensate to realize the opening and closing of the valve. The first major category of mechanical traps is the float trap. Mechanical traps include: Float type: The float is a closed hollow sphere. Its subcooling degree is small, and it is not affected by the change of working pressure and temperature, and it can drain water when there is water. There is no water stored in the heating equipment, and the water displacement is large. Belonging to this type of steam traps are inverted and float and so on. Thermostatic traps include bellows type, bellows type, and bimetallic sheet type. The bellows type and bellows type sensitive elements are bellows or ink cartridges, filled with volatile liquid, and the bimetallic sheet type sensitive elements are bimetallic sheets. The thermostatic steam trap operates by changing the temperature of the liquid, and uses the temperature difference between steam and condensed water to cause the deformation or expansion of the temperature sensing element to drive the valve core to open and close the valve. The thermostatic type steam trap operates by changing the thermodynamic properties of the liquid. Its subcooling degree is relatively large, and there is always high-temperature condensed water in front of the valve, and the displacement is small. The other major form of mechanical trap is the inverted bucket trap. The inverted bucket trap can be used in high pressure applications. If the air in the inverted bucket is not removed, it will hinder the normal operation of the trap, and the exhaust of the inverted bucket trap is very slow, so for the occasion where there is a large amount of air, a separate thermostatic air exhaust valve is required, otherwise it will cause water accumulation in the equipment. heat transfer efficiency. Many inverted bucket traps require a check valve to prevent loss of the water seal (flashing phenomenon) during sudden pressure changes or overheating. The water seal is one of the keys to ensure that the inverted bucket trap avoids steam leakage. All mechanical steam traps have a certain amount of condensed water in the valve body after the trap is closed, so this type of trap may be damaged by freezing. If installed in a low temperature outdoor environment, the valve body needs to be kept warm. The condensed water reaches the steam trap and the internal steam enters the bucket to generate steam inside the bucket and the steam inside the bucket is continuously cooled, and the vent hole in the bucket does not form a water seal. The buoyancy of the bucket's own weight makes the bucket lift up and the valve closes, and overflows from the vent hole. At the same time, the cold break discharges the air to the trap, so that the valve opens and the condensed water closes upside down. Condensed water enters the inverted bucket valve and hits the top again because the vent hole is very small and the bucket is discharged. Open the whole work cycle continuously. The exhaust is slow, so a separate exhaust valve is often required. Thermostatic steam traps operate on the temperature difference between steam and subcooled condensate or air-steam mixture. It can be used to allow the sensible heat energy in the condensate to be used in equipment that allows the presence of subcooled condensate. The disadvantage of thermostatic steam traps is that they discharge condensate below the saturation temperature of the steam and therefore cannot be used in heating equipment where immediate condensate discharge is required. In order to avoid the accumulation of water in the heat exchange equipment, a cooling pipe of 1 meter must be installed before the thermostatic trap. Thermodynamic steam traps (also known as disc traps in China) are widely used at home and abroad because of their compact structure, simple principle, and reliable operation. The thermodynamic steam trap works according to the "dynamic" pressure difference between the low-velocity condensate and the high-velocity flash steam. There is only one moving part in the whole working process-the stainless steel disc. It has a good closing force and can prevent the condensate from flowing back to the equipment to ensure the maximum working efficiency of the equipment. Because the thermodynamic steam trap requires that the pressure entering the trap should not be lower than a certain value, and the back pressure of the trap should generally not be higher than the inlet pressure, otherwise the trap will not work normally. In addition, thermodynamic steam traps discharge intermittently. Therefore, thermodynamic traps generally cannot be used in heat exchangers with high heating efficiency and temperature control equipment. The thermodynamic steam trap depends on the difference in flow velocity and volume change when steam and condensed water pass through, so that different pressure differences are generated between the upper and lower sides of the metal valve plate, and the metal valve plate is driven to open and close the valve. The thermodynamic steam trap has the advantages of simple structure, water hammer resistance and small displacement. Belonging to this type of steam trap, there are orifice type, pulse type and so on.

Both thermostatic and thermodynamic traps are only suitable for small displacement conditions, and lever float traps are used for conditions requiring a displacement of more than 30T/h. The structure of the lever float steam trap is based on the principle of leverage. There is a fulcrum in the middle, one end is the pressure generated by the different pressure inside and outside the outlet hole, and the other end is the buoyancy generated by the floating ball in the condensed water. The differential pressure double valve inverted bucket steam trap used in the prior art uses the working principle of the density difference between condensed water and steam. The internal structure is connected by a lever system to the inverted bucket. element. Generally, the opening of the steam trap valve needs to meet the following formula, the area of the outlet hole × the pressure at the outlet hole × the length from one end of the lever to the fulcrum < (the buoyancy of the float - the gravity of the float) × the length from the other end of the lever to the fulcrum. It can be known from the above formula that to make the valve open, the buoyancy of the float must be greater than the gravity of the float. This restricts that the wall thickness of the float cannot be increased without limit, that is, the pressure bearing capacity of the float is limited, and the maximum working pressure of the lever float steam trap is limited. To make the displacement of the valve large, the area of the outlet hole must be large. This requires the volume of the float to be large, and the length from the lever to the fulcrum should be long, which leads to the large volume of the lever float trap.

In addition to the correct selection of the steam trap, if the installation and piping are improper, the steam trap will not operate or leak steam. Waste of energy. The condensed water in the trap is driven by the difference between the pressure before the valve and the pressure behind the valve to push the condensed water out of the valve. If the resistance at the outlet of the trap is large, that is, the back pressure is large, the pressure difference between the front and rear of the trap will decrease. get smaller. The drainage capacity of the trap is also reduced. Generally, traps are installed below the condensate discharge equipment. However, if you want to install the trap higher than the condensate discharge equipment, you need to install a lifting joint in front of the trap so that the condensate can flow into the trap smoothly. Lift fittings may also be referred to as "suction lift fittings". Whether the trap is installed properly has a direct impact on the normal operation of the trap and the production efficiency of the equipment. The installation of the steam trap must be in accordance with the formal installation requirements, and the flow direction of the condensed water must be consistent with the arrow mark of the steam trap installation, so that the steam trap and the equipment can achieve the best working efficiency. Failure to install in the correct orientation can result in trap wear, failure, and steam leakage. Mechanical traps should be installed horizontally. In principle, thermostatic traps require horizontal installation, but they can also be installed vertically. In addition to the thermal power type, which must be installed horizontally, the disc type can be installed at any angle. In the discharge of condensate, both inverted bucket and disc traps discharge condensate intermittently. The float type discharges continuously, while the thermostatic type discharges continuously or intermittently depending on the load. When the load on the inverted bucket trap is extremely light, it will also discharge condensate continuously due to the trickle effect. Steam traps cannot be installed in series. There needs to be a non-insulated supercooled pipe of more than one meter in front of the thermostatic trap, and other types of traps should be as close as possible to the equipment. Although the thermodynamic steam trap can work in any installation orientation, in fact, due to the different working conditions of each equipment, it will cause water accumulation in the system. When the system load is reduced, the pressure in the heat exchanger is reduced and insufficient, so the condensed water is discharged, so that the equipment produces water accumulation, water hammer and other phenomena. In some applications the inability of the inverted bucket trap to remove air quickly can result in longer warm-up times and flooding of the equipment. If the bimetal trap is installed in a system with back pressure, the change of back pressure will affect the discharge of condensate water, the increase of temperature back pressure and the drop of discharge temperature will increase the possibility of water accumulation in the equipment. If the mechanical trap is installed in an outdoor low temperature environment, insulation should be added. The following reasons may cause the trap to fail. Like all mechanical mechanisms, steam traps will inevitably encounter wear and tear and cannot function normally. Impurities in the pipeline, water hammer or corrosion in the system can cause fatal damage to the trap. In addition, if the trap is selected and installed improperly, the trap will not work properly. Failure of steam traps manifests itself as leaking steam or failure to drain. Leakage of steam from the steam trap will cause waste of energy, and the inability to ensure stable pressure and temperature will increase the pressure of the condensate pipe, which will affect the performance of other equipment and cause erosion of the equipment. The blockage of the steam trap will lead to water accumulation in the equipment, resulting in incorrect temperature control, damage to product quality, reduced heat output, water hammer damage to equipment, etc. The lever float steam trap is a mechanical trap, which opens or closes the valve according to the difference between the buoyancy generated by the float and the gravity. The gravity is vertically downward, and the float is vertically upward, which leads to the steam trap The installation method of valve products is fixed. To meet different installation methods, it is necessary to develop a variety of similar products with the same performance except for different installation methods to meet the needs of working conditions.

Contents of the invention

The object of the present invention is to provide a differential pressure steam trap with high working pressure, small body and large displacement, flexible and variable installation, and multi-directional installation.

The object of the present invention can be achieved through the following measures. A differential pressure steam trap, comprising: a valve body 2 sealed and fixed between the tailstock plug 9 and the valve cover 1, and a sealed pressure vessel formed by it, characterized in that the valve with a horizontal inlet passage The cover 1 is butted with the stud nut 16 on the flange of the valve body 2 to form the valve cavity and the 90° elbow medium flow channel formed. The valve cavity is next to the vertical outlet channel of the blind hole outlet cylinder, and the vertical outlet channel passes through on the right side. The back pressure isolation chamber 17 connected to the medium storage chamber is connected to the tailstock cover 9; a valve disc 15 with a valve stem passes through the vertical outlet channel radial opening valve and the bowl-shaped slip ring 13 arranged in the medium storage chamber, Extending into the tailstock cover 9 to form a differential pressure assembly, the valve stem of the valve disc 15 moves linearly along the axis line under the action of the high pressure of the horizontal inlet channel, and the valve stem compresses the spring 12 of the valve disc 15 and its connection with the flange. At the outlet of the vertical outlet channel of the disk, under the action of the medium diversion hole 18 radially pointing to the back pressure isolation chamber 17, the pressure difference generated by the difference in the force area between the valve disc 15 and the bowl-shaped slip ring 13 controls the radial opening valve of the vertical outlet channel on and off.

Compared with the prior art, the technology of the present invention has the following advantages:

1. High work pressure. The present invention adopts a valve disc 15 with a valve stem to extend into the tail seat plugging cover 9 tail seat to form a differential pressure assembly through the spring seat and the rear socket sleeve 14 provided by the radial opening valve of the vertical outlet passage, and through the valve disc 15 Bowl-shaped slip ring 13 is fixedly connected at the rear, and bowl-shaped slip ring 13 is fixedly connected to the valve stem of the disc 15, and is installed in the sleeve 14 together and slides along the inner wall of the sleeve. Make a linear motion along the axis line, and under the action of the compression spring 12 of the spring seat of the valve disc 15 and the outlet of the vertical outlet channel, the media distribution hole 18 radially pointing to the back pressure isolation chamber 17, through the valve disc and the bowl-shaped slide The difference in the force-bearing area of the ring forms a pressure difference, which can transmit the pressure to each other, and has a strong ability to resist water hammer. According to the different pressures at both ends, the bowl-shaped slip ring 13 and the valve disc 15 are solidly connected to slide in the sleeve 14, and the opening and closing of the valve are controlled by the pressure difference, so that the opening or closing of the valve is not affected by gravity. , its structure can withstand extremely high pressure, overcomes the problem of the limitation of the maximum working pressure of the existing lever float steam trap, and can be well applied to high-pressure working conditions.

2. Large displacement. The present invention adopts the valve flap 15 with the valve stem, and the valve flap of the valve stem passes through the spring seat provided by the radial opening valve of the vertical outlet channel and the sleeve sleeve 14 behind it, and extends into the tail seat plugging cover 9 tail seat to form a differential pressure assembly , the conical valve disc reversely seals the vertical outlet channel radial opening valve to generate a pressure difference, the main valve is opened to obtain a large displacement, and the end face of the bowl-shaped slip ring 13 close to the tailstock plug 9 is subjected to the medium pressure introduced from the medium diversion hole 18 , accurate action, low noise, water hammer resistance, large discharge. The area of the bowl-shaped slip ring 13 close to the end face of the tailstock blocking cover 9 is larger than the inlet diameter of the valve, which ensures a large displacement from the structure. The opening area of the disc 15 is smaller than the diameter of the valve inlet, which can continuously remove condensed water, and the condensed water can flow into the trap smoothly, which can prevent the water in the drainage ditch from flowing back to the trap when the steam stops, which will cause failure. High, and the displacement is large, and the air removal performance is good. The medium circulation channel is similar to a 90° elbow. After opening, the flow resistance is small and the condensate generation is strong. It can be drained intermittently, the steam-water separation is reliable, no steam leakage, no freezing, and the condensate temperature can be controlled. The amount meets the requirement of the national standard that the amount of steam leakage is less than 3%.

3. The installation method is flexible and changeable. The present invention adopts a valve cover 1 with a horizontal inlet channel and a valve body with a vertical outlet channel, so that the valve can be composed of left-in and bottom-out, left-in-up-out, left-in and side-out, right-in and bottom-out, and right-in and up-out. Outlet, right-in and side-out, top-in and right-out, top-in and left-out, and up-in and side-out. The influence of gravity satisfies the installation and use of various working conditions. It avoids the restriction that the trap in the prior art must be installed according to a condensed water flow direction arrow mark, so that the trap and the equipment can achieve the best working efficiency, and the lifting joint needs to be installed in front of the trap to make the condensed water flow freely. Smooth flow into the trap restriction.

4. Small size. The present invention adopts the valve body 2 sealed and fixed between the tailstock plug 9 and the valve cover 1, and the sealed pressure vessel formed by it, the structure is extremely compact, and the working medium flows in from the inlet of the valve cover 1 and flows out from the valve body 2. The flow-through channel is similar to a 90° elbow, with only a valve disc 15 in the middle, without any other mechanism. Compared with the large-displacement lever float type steam trap, the volume is much smaller, and it can better meet the compact installation space.

To sum up, the present invention solves the problem of requiring both high pressure and large displacement. The invention also overcomes the disadvantage that the mechanical trap can only have one installation method and can have various installation methods.

Description of drawings

In order to further explain rather than limit the above-mentioned implementation of the patent of the present invention, the patent of the present invention will be further described below in conjunction with the accompanying drawings, but the patent of the present invention is not limited to the scope of the invention. All these ideas should be regarded as the content and protection scope disclosed by the patent of the present invention.

Fig. 1 is the differential pressure steam trap of the present invention.

FIG. 2 is a sectional view of FIG. 1 .

In the figure: 1 valve cover, 2 valve body, 3 front bushing, 4 T-shaped air discharge valve, 5 gland, 6 metal valve plate, 7 cover, 8 sealing gasket, 9 tail seat plug, 10 valve stem shaft Sleeve, 11 nut, 12 compression spring, 13 bowl-shaped slip ring, 14 sleeve, 15 disc, 16 stud nut, 17 back pressure isolation chamber, 18 medium distribution hole, 19 blind hole outlet cylinder.

Detailed ways

Refer to Figure 1 and Figure 2. In the embodiment described below, a differential pressure steam trap includes: a valve body 2 sealed and fixed between the tailstock plug 9 and the valve cover 1 , and a sealed pressure vessel formed by it. The bonnet 1 with a horizontal inlet channel is butted with the stud nuts 16 on the flange of the valve body 2 to form the valve cavity and the 90° elbow medium flow channel formed, and the valve cavity is adjacent to the vertical outlet channel of the blind hole outlet cylinder , the right side of the vertical outlet passage is connected to the back pressure isolation chamber 17 connected with the medium storage chamber to the tailstock blocking cover 9; a valve disc 15 with a valve stem is radially opened through the vertical outlet passage and is arranged in the medium storage chamber The bowl-shaped slip ring 13 extends into the tail seat cover 9 to form a differential pressure assembly. The valve stem of the valve disc 15 moves linearly along the axis line under the action of the high pressure of the horizontal inlet passage, and the valve stem compresses the spring on the valve disc 15. 12 and the outlet of the vertical outlet channel with a flange, under the action of the medium diversion hole 18 radially pointing to the back pressure isolation chamber 17, the pressure difference generated by the difference in the force area between the valve disc 15 and the bowl-shaped slip ring 13 is controlled. Opening and closing of radial opening valves for vertical outlet channels. The valve cover 1 is detachably connected to the inlet end of the valve body 2, and the working medium flows in from the inlet of the valve cover 1 and flows out from the outlet channel of the valve body 2 perpendicular to the above-mentioned inlet channel.

The upper side of the tail shell of the valve body 2 is fixedly connected with a T-shaped air discharge valve 4 connected to the built-in flow channel of the sealed pressure vessel, and a freely movable valve is installed between the T-shaped air discharge valve 4 and the boss under the inner cavity of the gland 5 The metal valve plate 6 is fixed on the end-to-ring groove of the boss of the gland 5 inner chamber and the T-shaped air discharge valve 5 to form a steam lock to prevent air from being blocked. The steam lock is screw-sealed by the cover 7 of the valve body 2 shells. The end ring groove of the T-shaped air discharge valve 5 is formed with an oblique passage, and the oblique passage communicates with the back pressure isolation chamber 17 through the medium passage of the valve body 2 .

The tail end of the valve body 2 is fixedly connected with a tail seat plug 9 with a blind hole barrel, the blind hole barrel is equipped with a valve stem bushing 10 that is dynamically matched with the disc connecting rod, and the center step hole on the inner end face of the tail seat plug 9 A rear axle sleeve 11 axially connected to the valve stem axle sleeve 10 is assembled. A member similar to a 90° elbow is formed in the sealed pressure vessel formed between the valve body 2 and the inlet of the valve cover 1, and the member is formed with a blind hole outlet cylinder radially protruding from the outer shell of the valve body 2, The radial direction of the blind hole outlet cylinder is equipped with the conical surface hole of the inner cone of the switch valve disc 15 and the front sleeve 3 for assembling the valve disc step shaft, and the inner side of the blind hole outlet cylinder is fixedly connected through the tail port of the valve body 2 The valve cover 1 forms a medium storage cavity for storing medium in the sealed pressure vessel, and the medium storage cavity is integrated with the blind hole outlet cylinder, forming a medium side flow channel parallel to the upper inner wall with the inner wall of the sealed pressure vessel. A bowl-shaped slip ring 13 is installed at the end of the flow channel on the medium side. The middle of the bowl body of the bowl-shaped slip ring 13 is equipped with a spring seat equipped with a compression spring 12. The compression spring 12 is assembled between the spring seat and the cylinder of the front sleeve 3. The outer circumference of bowl-shaped slip ring 13 sleeves 14 is shaped on slip rings. The valve stem integrated with the valve disc 15 passes through the switch hole of the blind hole outlet cylinder, the front sleeve 3, the rear sleeve 11 connected to the rear end of the bowl-shaped slip ring 13, and the valve stem sleeve 10 are fixed on the extension. Out of the blind hole cylinder on the outer end surface of the tailstock blocking cover 9, it moves linearly along its axis under the action of the fluid medium. The compression spring 12 provides a predetermined value for controlling the closing force of the valve disc 15 valve stem.

The bowl-shaped slip ring 13 is assembled on the rear end of the barrel sleeve 14. At least three ring grooves are formed on the circumference of the bowl-shaped slip ring 13, and a through hole for assembling the valve disc 15 valve stem is formed in the center, and the valve stem passes through the vertical outlet in turn. The front bushing 3, valve bowl-shaped slip ring 13 central through hole assembled by the radial opening of the channel, the nut 11 connected to the back end of the bowl-shaped slip ring 13 and the valve stem bushing 10 form a front bushing 3, valve The central boss of the bowl-shaped slip ring 13 spring seat covers the compression spring 12, and is a component that moves linearly along the axial direction in the sleeve sleeve 14.

The end surface of the bowl-shaped slip ring 13 close to the tailstock cover 9 is subjected to the medium pressure introduced from the medium diversion hole 18, the area of the end surface of the bowl-shaped slip ring 13 close to the tailstock cover 9 is larger than the inlet diameter of the valve, and the opening of the valve disc 15 The area is smaller than the valve inlet diameter area.

The storage medium enters the axial channel of the T-shaped air discharge valve 4 along the medium side flow channel of the 90° elbow at the sealing end of the vertical outlet channel, and drives the metal valve plate 6 covered on it, so that it is connected between the T-shaped air discharge valve 4 and the pressure The cover 5 moves between the covering spaces, thereby opening or closing the axial through hole of the T-shaped air discharge valve 4, and controlling the flow of the medium entering the back pressure isolation chamber 17 from the oblique passage.

The outer cylindrical surface of the sleeve 14 is provided with a constriction pointing to the gap at the back end of the bowl-shaped slip ring 13. The medium in the valve cavity flows into the cavity of the back pressure isolation cavity 17 formed by the bowl-shaped slip ring 13 and the end face of the tail seat cover 9 through the radial medium diversion hole 18 of the vertical outlet channel. The bowl-shaped slip ring 13 moves along the axial direction of the front sleeve 3, and at the same time, the storage medium flows into the vertical outlet channel of the valve body 2 from the valve opening of the valve disc 15.

The foregoing descriptions of the present invention and its embodiments are provided to those skilled in the art of the invention and are to be considered illustrative rather than restrictive. Engineers and technicians can implement specific operations based on the ideas in the claims of the invention, and can make various changes in form and details without departing from the spirit and scope of the present invention defined by the appended claims. Variety. All of the above should be considered as the scope of the present invention.

Claims (10)

1. a kind of differential pressure type steam trap, including：Sealing is fixed on the valve body (2) between tailstock blanking cover (9) and valve deck (1), And it is allowed to the sealed pressure vessel to be formed, which is characterized in that the valve deck (1) with horizontal inlet channel passes through valve body (2) method Stud nut (16) docking on blue disk forms valve chamber and its 90 ° of elbow medium flow channels of formation, and blind hole outlet is connect by valve chamber Cylinder vertical outlet passage, vertical outlet passage right side connect tailstock by the back pressure separate cavities (17) that media storage chamber is connected and block up It covers (9)；One flap (15) with valve rod is by vertical outlet passage radial opening valve and its is arranged in media storage chamber Bowl-type slip ring (13) in body stretches into tailstock blanking cover (9) composition differential pressure component, and flap (15) and its valve rod are in horizontal inlet channel It is for linear motion under the action of high-pressure, and in flap (15) valve rod compressed spring (12) and its it is radially directed towards back pressure separate cavities (17) it under medium shunt hole (18) effect, is generated by flap (15) forced area difference different from bowl-type slip ring (13) Pressure difference controls the open and close of vertical outlet passage radial opening valve.

2. as described in claim a kind of differential pressure type steam trap, it is characterised in that：Valve deck (1) is removably connected firmly in valve The input end of body (2), working media is flowed into from valve deck (1) access road, from valve body (2) perpendicular to the exit passageway of access road Outflow.

3. as described in claim a kind of differential pressure type steam trap, it is characterised in that：It is connected firmly on the upside of the shell of valve body (2) tail portion There are one the T shapes air bleeder valves (4) of runner built in communication seals pressure vessel, in T shapes air bleeder valve (4) and gland (5) A valve metal film that can be freely moved (6) is filled between the lower projection of inner cavity, it is convex that valve metal film (6) is fixed on gland (5) inner cavity The end of platform and T shapes air bleeder valve (5) forms the steam vapour lock for preventing air gas stifled on annular groove, and steam vapour is locked by valve body (2) Capping (7) spiral shell of shell seals.

4. as described in claim a kind of differential pressure type steam trap, it is characterised in that：Valve body (2) and valve deck (1) import it Between component similar to 90 ° of elbow is formed in the sealed pressure vessel that is formed, be formed on the component and extend radially out valve body (2) shell blind hole export cylinder, blind hole outlet cylinder radial direction be formed with switch flap (15) interior centrum conical hole and Axle sleeve (3) is set before assembly valve rod central stepped axis, side is connected firmly by valve body (2) tail portion port in the blind hole Exported Cone body Valve deck (1) forms the media storage chamber of sealed pressure vessel storage medium, and media storage cavity is linked to be with blind hole outlet cylinder One, a medium side stream passages parallel with upper part inner wall are formd with the sealed pressure vessel inner wall.

5. as described in claim a kind of differential pressure type steam trap, it is characterised in that：Storage medium is along vertical outlet passage Medium side stream passages on 90 ° of elbow faces of sealing end enter T shapes air bleeder valve (4) axial passage, drive the gold covered thereon Belong to valve block (6), so that its valve metal film (6) is moved between T shapes air bleeder valve (4) and gland (5) capping space, to open Or the axially extending bore of T shapes air bleeder valve (4) is closed, control enters the medium flow field of back pressure separate cavities (17) from slanted channel Amount.

6. as described in claim a kind of differential pressure type steam trap, it is characterised in that：Bowl-type slip ring (13) is assemblied in jacket casing (14) rear end, at least three annular grooves are formed on the circumference of bowl-type slip ring (13), and center is formed with the logical of assembly flap (15) valve rod Hole, valve rod sets axle sleeve (3) before sequentially passing through the assembly of vertical outlet passage radial opening, valve bowl-type slip ring (13) center leads to Hole, bowl-type slip ring (13) backside connected nut (11) and valve stem sleeve (10), composition one set axle sleeve (3), valve before passing through The compressed spring (12) being set between bowl-type slip ring (13) centering spring seat moves in a straight line in the axial direction in jacket casing (14) Component.

7. as described in claim a kind of differential pressure type steam trap, it is characterised in that：There are one the tail end of valve body (2) connects firmly Tailstock blanking cover (9) with blind hole cylinder, valve stem sleeve (10) of the blind hole wound packages equipped with dynamic cooperation flap connecting rod, tailstock blanking cover (9) Inner side end center stepped hole is equipped with axial the rear of connection valve stem sleeve (10) and sets axle sleeve (11).

8. as described in claim a kind of differential pressure type steam trap, it is characterised in that：Medium side runner tail portion is equipped with bowl-type Slip ring (13), the bowl body middle part of bowl-type slip ring (13) are formed with the spring base of assembly compressed spring (12), compressed spring (12) assembly Spring base and before set axle sleeve (3) cylinder between, be formed with slip ring on the excircle of bowl-type slip ring (13) jacket casing (14).

9. as described in claim a kind of differential pressure type steam trap, it is characterised in that：The valve rod being connected with flap (15) Sequentially pass through blind hole outlet cylinder switch hole, it is preceding set axle sleeve (3), connection bowl-type slip ring (13) rear end it is rear set axle sleeve (11) and its Valve stem sleeve (10) is fixed in the blind hole cylinder for stretching out tailstock blanking cover (9) end face outside, along its axle center under fluid media (medium) effect Line is for linear motion.

10. as described in claim a kind of differential pressure type steam trap, it is characterised in that：Compressed spring (12) provides a control The predetermined value of flap (15) valve rod closing forces processed.