Automatic pressure stabilizing steam pressure reducer

Abstract

The utility model relates to a desuperheater, and aims to provide an automatic pressure stabilizing steam pressure reducer which has the characteristics that the steam pressure can be automatically adjusted, and the structure is relatively simple. According to the technical scheme, the automatic pressure stabilizing steam pressure reducer is characterized in that a lower sleeve coaxially arranged with an upper sleeve is fixed between the upper sleeve and an outlet channel; a valve clack in sliding fit with the inner wall of the upper sleeve is fixed to the bottom end of the valve rod, and a sliding sleeve which is in sliding fit with the inner wall of the lower sleeve and provided with an opening in the bottom end is coaxially fixed to the bottom end of the valve clack. A plurality of through holes for circulating steam are formed in the circumferential surfaces of the lower sleeve and the sliding sleeve; an adjusting cover in sliding fit with the inner wall of the lower sleeve is coaxially arranged below the sliding sleeve, and an elastic component exerts upward jacking pressure on the adjusting cover.

Description

Technical Field

[0001] The utility model relates to a desuperheater, in particular to an automatic pressure-stabilizing steam decompressor. Background Art

[0002] CN208546749U discloses a novel steam temperature reduction and pressure reduction device, comprising a four-way interface, the top of the four-way interface is connected to a first pressure reducing orifice plate, the top of the four-way interface is connected to a valve seat, and a temperature reduction and pressure reduction valve is installed on the top of the valve seat, the right end of the four-way interface is connected to a second pressure reducing orifice plate, one side of the second pressure reducing orifice plate is connected to a steam pipe, the top of the steam pipe is connected to a first connecting pipe, the top of the first connecting pipe is connected to a spring nozzle, and one side of the spring nozzle is provided with a cold water pipe joint. The device has a simple structure, is stable and reliable, is easy to operate, and is convenient to use, and can greatly improve the efficiency of temperature reduction and pressure reduction work.

[0003] The above-mentioned steam pressure reducing valve has the disadvantages of being unable to automatically adjust when the output steam pressure is too low, and having a relatively complex structure, making it inconvenient to manufacture and maintain. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the above-mentioned background technology and provide an automatic pressure-stabilizing steam pressure reducer, which has the characteristics of automatically adjusting the steam pressure and having a relatively simple structure.

[0005] The technical solution provided by the utility model is:

[0006] An automatic pressure-stabilizing steam pressure reducer comprises a valve body with an inlet channel and an outlet channel at the bottom, an upper sleeve vertically installed between the inlet channel and the outlet channel and having a plurality of through holes on the circumferential surface, a valve stem movably arranged in the valve body, and a power mechanism installed on the top of the valve body to drive the valve stem;

[0007] The invention is characterized in that: a lower sleeve coaxially arranged with the upper sleeve is fixed between the upper sleeve and the outlet channel; a valve flap slidably matched with the inner wall of the upper sleeve is fixed to the bottom end of the valve stem, and a sliding sleeve slidably matched with the inner wall of the lower sleeve and open at the bottom end is coaxially fixed to the bottom end of the valve flap; a plurality of through holes for circulating steam are provided on the circumferential surfaces of the lower sleeve and the sliding sleeve; an adjusting cover slidably matched with the inner wall of the lower sleeve is coaxially arranged below the sliding sleeve, and an elastic component applies upward pressure to the adjusting cover.

[0008] The top end of the adjusting cover is open and the bottom end is closed, and the inner and outer diameters of the adjusting cover are the same as the inner and outer diameters of the sliding sleeve.

[0009] The elastic component is an adjusting spring.

[0010] The inner diameter of the lower sleeve is smaller than the inner diameter of the upper sleeve, thereby forming a first step between the inner walls of the upper and lower sleeves, and a second step is formed between the outer circumferential surface of the valve disc and the outer circumferential surface of the sliding sleeve. The second step cooperates with the first step to form a valve port for opening or closing the pressure reducing valve.

[0011] The through holes on the upper sleeve are located in the lower half of the upper sleeve; when the valve port is closed, the outer circumferential surface of the valve disc blocks and seals all the through holes on the upper sleeve, and the adjustment cover is in the highest position and blocks and seals all the through holes on the lower sleeve.

[0012] The valve flap is fixed on the valve stem through a threaded structure.

[0013] The power mechanism comprises a motor and a screw mechanism driven by the motor.

[0014] The beneficial effects of the utility model are as follows: due to the design of three sleeves that cooperate with each other, and the flow area of ​​each of the three sleeves can be adjusted with the opening of the valve, the pressure reduction capacity is greatly improved (more than 3 times that of conventional valves); and when the steam pressure in the outlet channel is too low, the regulating spring pushes the regulating cover upward to close the outlet; only when the steam pressure reaches the requirement, the regulating cover moves downward to allow the steam to flow out from the through hole on the lower sleeve; thereby maintaining the pressure of the output steam stable and greatly reducing the fluctuation range of the output steam. In addition, the utility model has a relatively simple structure and is convenient to manufacture and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a main structural schematic diagram of an embodiment of the utility model.

[0016] Reference numerals in the figure: adjusting cover 1, inlet passage 2, valve body 3, valve cover 4, power mechanism 5, valve stem 6, upper sleeve 7, valve disc 8, lower sleeve 9, sliding sleeve 10, outlet passage 11, elastic component 12. DETAILED DESCRIPTION

[0017] The following is a further description with reference to the embodiments shown in the accompanying drawings.

[0018] The automatic pressure-stabilizing steam pressure reducing valve shown in the accompanying drawings comprises a valve body 3 with an inlet channel 2 and an outlet channel 11 at the bottom, an upper sleeve 7 vertically installed between the inlet channel and the outlet channel and having a plurality of through holes on the circumferential surface (these through holes penetrate the inner and outer walls of the upper sleeve for steam flow), a valve stem 6 movably arranged in the valve body, and a power mechanism 5 installed on the top of the valve body and driving the valve stem to move up and down; the above structure is similar to the existing steam pressure reducer.

[0019] The improvements of the utility model are:

[0020] A lower sleeve 7 is provided between the upper sleeve and the outlet passage. The lower sleeve is coaxially arranged with the upper sleeve and has a plurality of through holes on its circumferential surface (these through holes also penetrate the inner and outer walls of the lower sleeve for the flow of steam); the inner diameter of the lower sleeve is smaller than the inner diameter of the upper sleeve, so that a first step (i.e., a step protruding from top to bottom toward the sleeve axis) is formed between the inner walls of the upper and lower sleeves; a valve flap 8 is fixed to the bottom end of the valve stem, and the outer circumferential surface of the valve flap is slidably matched with the inner wall of the upper sleeve; the valve flap The bottom end of the lower sleeve is also coaxially fixed with a sliding sleeve 10 with an open bottom end, which is slidably matched with the inner wall of the lower sleeve and has a plurality of through holes on its circumferential surface (these through holes also penetrate the inner and outer walls of the sliding sleeve for steam flow); a second step (i.e., a step that is retracted from top to bottom toward the axial direction of the sliding sleeve) is formed between the outer circumferential surface of the valve disc and the outer circumferential surface of the sliding sleeve, and the second step is matched with the outwardly protruding step to form a valve port for opening or closing the pressure reducing valve.

[0021] An adjusting cover 1 is coaxially arranged below the sliding sleeve, and the adjusting cover is slidably matched with the inner wall of the lower sleeve. There is also an elastic component 12 that applies an upward pressing force to the adjusting cover. Only when the steam pressure is greater than the pressure of the elastic component can the adjusting cover be pushed downward and the through hole on the lower sleeve be connected; the steam can flow into the outlet channel through the through hole on the lower sleeve.

[0022] The top end of the adjusting cover is open and the bottom end is closed, and the inner and outer diameters of the adjusting cover are the same as the inner and outer diameters of the sliding sleeve.

[0023] The elastic component is an adjusting spring (preferably a coil spring).

[0024] All the through holes on the upper sleeve are located in the lower half of the upper sleeve; when the valve port is closed, the outer circumferential surface of the valve disc just blocks all the through holes on the upper sleeve. At the same time, the through holes on the sliding sleeve and the through holes on the lower sleeve are just offset from each other, and the adjustment cover is pressed to the highest position by the elastic component to block all the through holes on the lower sleeve.

[0025] The valve flap is fixed on the valve stem through a threaded structure, which is a conventional fixing structure.

[0026] The power mechanism comprises a motor and a screw mechanism driven by the motor; the power mechanism is also a conventional mechanism.

[0027] The working principle of the utility model is:

[0028] When in the closed state, the valve stem drives the sliding sleeve group to move downward until the second step is correspondingly engaged with the first step, thereby closing the valve port (the inlet channel and the outlet channel are closed, and the valve is in the closed state); at this time, the adjusting cover also moves upward under the action of the elastic component, and completely blocks and closes all the through holes on the lower sleeve.

[0029] When it is necessary to open, the power mechanism is started, and the sliding sleeve is pulled up through the valve stem, the second step is separated from the first step, and the blocked through holes on the upper sleeve and the sliding sleeve begin to conduct, and the steam input into the inlet channel flows into the inner cavity of the sliding sleeve through the through holes on the upper sleeve and the sliding sleeve in turn; then the regulating cover moves downward under the action of the steam pressure, so that the through holes on the lower sleeve begin to conduct, and the steam entering the inner cavity of the sliding sleeve flows into the outlet channel through the through holes on the lower sleeve, and then is output. Among them, the steam enters the inner cavity of the upper sleeve from the inlet channel through the through holes on the upper sleeve, and the first stage of decompression is performed; the steam enters the inner cavity of the sliding sleeve from the inner cavity of the upper sleeve through the through holes on the sliding sleeve, and the second stage of decompression is performed; the steam enters the inner cavity of the sliding sleeve from the inner cavity of the lower sleeve through the through holes on the sliding sleeve, and the third stage of decompression is performed;

[0030] The valve stem continues to pull up the valve disc, so that the number of through holes on the upper sleeve and the sliding sleeve continues to increase, and the regulating cover moves further downward under the increased steam pressure; the steam in the inlet channel can flow into the outlet channel with a larger flow rate through more through holes on the upper sleeve, the sliding sleeve and the lower sleeve in turn, and then be output;

[0031] The valve stem further pulls up the valve disc until the bottom end of the valve disc exceeds the highest row of through holes in the upper sleeve. At this time, the through holes on the upper sleeve, the sliding sleeve and the lower sleeve are all connected, and the steam in the inlet channel flows into the outlet channel through the upper sleeve, the sliding sleeve and all the through holes on the lower sleeve in turn, and then is output, and the flow rate reaches the maximum value.

Claims

1. An automatic pressure-stabilizing steam pressure reducer, comprising a valve body (3) with an inlet channel (2) and an outlet channel (11) at the bottom, an upper sleeve (7) vertically installed between the inlet channel and the outlet channel and having a plurality of through holes on its circumferential surface, a valve stem (6) movably arranged in the valve body up and down, and a power mechanism (5) installed on the top of the valve body to drive the valve stem; Features: A lower sleeve (9) coaxially arranged with the upper sleeve is fixed between the upper sleeve and the outlet channel; a valve flap (8) slidably matched with the inner wall of the upper sleeve is fixed to the bottom end of the valve stem, and a sliding sleeve (10) slidably matched with the inner wall of the lower sleeve and open at the bottom end is coaxially fixed to the bottom end of the valve flap; a plurality of through holes for circulating steam are provided on the circumferential surfaces of the lower sleeve and the sliding sleeve; an adjusting cover (1) slidably matched with the inner wall of the lower sleeve is coaxially arranged below the sliding sleeve, and an elastic component (12) applies an upward pressing force to the adjusting cover.

2. The automatic pressure-stabilizing steam pressure reducer according to claim 1, characterized in that: The top end of the adjusting cover is open and the bottom end is closed, and the inner and outer diameters of the adjusting cover are the same as the inner and outer diameters of the sliding sleeve.

3. The automatic pressure-stabilizing steam pressure reducer according to claim 2, characterized in that: The elastic component is an adjusting spring.

4. The automatic pressure-stabilizing steam pressure reducer according to claim 3, characterized in that: The inner diameter of the lower sleeve is smaller than the inner diameter of the upper sleeve, thereby forming a first step between the inner walls of the upper and lower sleeves, and a second step is formed between the outer circumferential surface of the valve disc and the outer circumferential surface of the sliding sleeve. The second step cooperates with the first step to form a valve port for opening or closing the pressure reducing valve.

5. The automatic pressure-stabilizing steam pressure reducer according to claim 4, characterized in that: The through holes on the upper sleeve are located in the lower half of the upper sleeve; when the valve port is closed, the outer circumferential surface of the valve disc blocks and seals all the through holes on the upper sleeve, and the adjustment cover is in the highest position and blocks and seals all the through holes on the lower sleeve.

6. The automatic pressure-stabilizing steam pressure reducer according to claim 5, characterized in that: The valve flap is fixed on the valve stem through a threaded structure.

7. The automatic pressure-stabilizing steam pressure reducer according to claim 6, characterized in that: The power mechanism comprises a motor and a screw mechanism driven by the motor.

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