Three-stage sleeve steam pressure reducing valve

Abstract

The utility model relates to a pressure reducer, and aims to provide a three-stage sleeve steam pressure reducing valve which has the characteristics of good steam pressure reducing performance and simple structure. According to the technical scheme, the three-stage sleeve steam pressure reducing valve is characterized in that a lower sleeve is arranged between an upper sleeve and an outlet channel, the lower sleeve and the upper sleeve are coaxially arranged, a plurality of through holes are formed in the circumferential face of the lower sleeve, the inner diameter of the lower sleeve is smaller than that of the upper sleeve, and therefore a first step is formed between the inner walls of the upper sleeve and the lower sleeve; a valve clack in sliding fit with the inner wall of the upper sleeve is fixed to the bottom end of the valve rod. A sliding sleeve is coaxially arranged at the bottom end of the valve clack, wherein the sliding sleeve is in sliding fit with the inner wall of the lower sleeve, and a plurality of through holes are formed in the circumferential face of the sliding sleeve. And a second step is formed between the outer circumferential surface of the valve clack and the outer circumferential surface of the sliding sleeve, and the second step is correspondingly matched with the first step to form a valve port for opening or closing the pressure reducing valve.

Description

Technical Field

[0001] The utility model relates to a pressure reducer, in particular to a three-stage sleeve steam pressure reducing valve. Background Art

[0002] CN116293017A discloses a high-pressure steam pressure reducing valve, comprising a pilot valve part and a main valve part, the main valve part comprising a main valve housing, a main valve core, a main valve spring and a high-pressure branch, the main valve housing is provided with an inlet pipe, an outlet pipe, a transition chamber, a throttle port and a high-pressure chamber, the pilot valve part is sealed and connected to the upper open end of the high-pressure chamber of the main valve housing, the inlet pipe, the transition chamber, the throttle port and the outlet pipe are connected in sequence, and the high-pressure branch connects the inlet pipe and the high-pressure chamber, the main valve core is slidably installed in the main valve housing along the vertical direction, the main valve spring is arranged between the main valve core and the main valve housing, and the main valve housing is slidably installed with a sealing baffle at the end of the inlet pipe. The pressure reducing valve can rapidly reduce and stabilize the pressure of high-pressure steam, thereby improving the working efficiency of the pressure reducing valve.

[0003] The disadvantage of the above steam pressure reducing valve is that the structure is relatively complicated and the manufacturing and maintenance are inconvenient. 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 a three-stage sleeve steam pressure reducing valve, which should have the characteristics of good steam pressure reducing performance and simple structure.

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

[0006] A three-stage sleeve steam pressure reducing valve 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] It is characterized in that: a lower sleeve is arranged coaxially with the upper sleeve and has a plurality of through holes on its circumferential surface between the upper sleeve and the outlet channel, the inner diameter of the lower sleeve is smaller than the inner diameter of the upper sleeve so that a first step is formed between the inner walls of the upper and lower sleeves; a valve disc that slides with the inner wall of the upper sleeve is fixed to the bottom end of the valve stem, and a sliding sleeve that slides with the inner wall of the lower sleeve and has a plurality of through holes on its circumferential surface is coaxially arranged at the bottom end of the valve disc; a second step is formed between the outer circumferential surface of the valve disc and the outer circumferential surface of the sliding sleeve, and the second step cooperates with the first step accordingly to form a valve port for opening or closing the pressure reducing valve.

[0008] The through hole on the sliding sleeve is located at the upper half of the sliding sleeve, and the through hole on the lower sleeve is located at the lower half of the lower sleeve; so that when the pressure reducing valve is closed, the through hole on the sliding sleeve and the through hole on the lower sleeve are exactly offset from each other.

[0009] 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 all the through holes on the upper sleeve.

[0010] The valve flap is fixed on the valve stem through a threaded structure.

[0011] The power mechanism comprises a motor and a screw mechanism driven by the motor.

[0012] The beneficial effects of the utility model are as follows: since three sleeves are designed to 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 relief capacity is greatly improved (more than 3 times that of a conventional valve); in addition, the utility model has a relatively simple structure and is easy to manufacture and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a main structural schematic diagram of an embodiment of the utility model.

[0014] Numbers in the figure: inlet channel 1, valve body 2, valve cover 3, power mechanism 4, valve stem 5, upper sleeve 6, valve disc 7, lower sleeve 8, sliding sleeve 9, outlet channel 10. DETAILED DESCRIPTION

[0015] The following is a further description with reference to the embodiments shown in the accompanying drawings.

[0016] The three-stage sleeve steam pressure reducing valve shown in the accompanying drawings comprises a valve body 2 with an inlet channel 1 and an outlet channel 9 at the bottom, an upper sleeve 5 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 5 movably arranged in the valve body up and down, and a power mechanism 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 desuperheater.

[0017] The improvements of the utility model are:

[0018] A lower sleeve 8 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 steam flow); 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 in the direction of the sleeve axis) is formed between the inner walls of the upper and lower sleeves; a valve flap 7 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; a sliding sleeve 9 is also coaxially provided at the bottom end of the valve flap, the sliding sleeve 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 retracted from top to bottom in the direction of the sliding sleeve axis) is formed between the outer circumferential surface of the valve flap and the outer circumferential surface of the sliding sleeve, and the second step is correspondingly matched with the step protruding outward, so as to form a valve port for opening or closing the pressure reducing valve.

[0019] 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 and seals all the through holes on the upper sleeve.

[0020] All the through holes on the sliding sleeve are located in the upper half of the sliding sleeve, and all the through holes on the lower sleeve are located in the lower half of the lower sleeve; when the valve port is closed, the through holes on the sliding sleeve are blocked by the lower sleeve, and at the same time, the through holes on the lower sleeve are also blocked by the sliding sleeve.

[0021] The valve flap is fixed on the valve stem through a threaded structure, which is a conventional fixing structure.

[0022] The power mechanism comprises a motor and a screw mechanism driven by the motor; the power mechanism is also a conventional mechanism.

[0023] The working principle of the utility model is:

[0024] In the closed state, the valve stem drives the sliding sleeve assembly 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).

[0025] 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, the lower sleeve and the sliding sleeve begin to be connected, and the steam in the inlet channel can pass through the through holes on the upper sleeve, the through holes on the sliding sleeve and the through holes on the lower sleeve in turn, flow into the outlet channel and then be output from the pressure valve; wherein, 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 lower sleeve (the bottom end of the sliding sleeve is open and located in the inner cavity of the lower sleeve, so the inner cavity of the sliding sleeve and the inner cavity of the lower sleeve are integrated, and the steam pressure therein remains unchanged) and enters the outlet channel, and the third stage of decompression is performed;

[0026] The valve stem continues to pull up the sliding sleeve, so that the number of through holes on the upper sleeve, the lower sleeve and the sliding sleeve continues to increase, and 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 from the pressure valve;

[0027] The valve stem further lifts the sliding sleeve 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, lower sleeve and sliding sleeve are all connected, and the steam in the inlet channel flows into the outlet channel through the upper sleeve, sliding sleeve and all the through holes on the lower sleeve in turn, and then is output from the pressure valve, and the flow rate reaches the maximum value.

Claims

1. A three-stage sleeve steam pressure reducing valve, comprising a valve body (2) with an inlet channel (1) and an outlet channel (10) at the bottom, an upper sleeve (6) vertically installed between the inlet channel and the outlet channel and having a plurality of through holes on its circumferential surface, a valve stem (5) movably arranged in the valve body up and down, and a power mechanism (4) installed on the top of the valve body to drive the valve stem; Features: A lower sleeve (8) is arranged coaxially with the upper sleeve and has a plurality of through holes on its circumferential surface between the upper sleeve and the outlet channel. 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. A valve flap (7) that slides with the inner wall of the upper sleeve is fixed to the bottom end of the valve stem. A sliding sleeve (9) that slides with the inner wall of the lower sleeve and has a plurality of through holes on its circumferential surface is coaxially arranged at the bottom end of the valve flap. A second step is formed between the outer circumferential surface of the valve flap and the outer circumferential surface of the sliding sleeve. The second step corresponds to the first step to form a valve port for opening or closing the pressure reducing valve.

2. The three-stage sleeve steam pressure reducing valve according to claim 1 is characterized in that: The through hole on the sliding sleeve is located at the upper half of the sliding sleeve, and the through hole on the lower sleeve is located at the lower half of the lower sleeve; so that when the pressure reducing valve is closed, the through hole on the sliding sleeve and the through hole on the lower sleeve are exactly offset from each other.

3. The three-stage sleeve steam pressure reducing valve according to claim 2 is 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 all the through holes on the upper sleeve.

4. The three-stage sleeve steam pressure reducing valve according to claim 3 is characterized in that: The valve flap is fixed on the valve stem through a threaded structure.

5. The three-stage sleeve steam pressure reducing valve according to claim 4 is characterized in that: The power mechanism comprises a motor and a screw mechanism driven by the motor.

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