A lever float type steam trap

Abstract

The present invention provides a lever float steam trap, comprising a valve body (4), a float assembly (13-12), a control frame assembly (13), a valve cover (14), and a shroud assembly (15). The valve body (4) is fixedly connected to the valve cover (14). An inlet pipe (16) is installed at the upper inlet of the valve cover (14) and connected to the shroud assembly (15). The control frame assembly (13) is located inside the cavity of the valve body (4). The control frame assembly (13) is provided with a float assembly (13-12), a spring (13-6), a valve core (13-10), and a valve seat 8 connected to the valve body (4). An outlet pipe (2) is provided at the lower end of the valve body (4), and a drain plug (3) is provided at the lower end of the valve body (4). The beneficial effects of this invention are: the steam trap has zero steam leakage rate under no-load and is reliable in closing; the combination of the folding lever force-enhancing structure and the spring (13-6) force-enhancing structure increases the valve opening torque under high pressure, making the valve open and close freely.

Description

Technical Field

[0001] This invention relates to the field of steam trap technology, specifically to a lever float-type steam trap that can automatically drain and block steam in medium and high pressure steam heating equipment and recover condensate using the back pressure of the steam trap. Background Technology

[0002] With the continuous deepening of the national efforts in energy conservation and emission reduction, lever-type float steam traps, as a type of self-operated steam trap, have become widely used. Different types of steam traps are selected for different operating conditions. Currently available steam traps are approximately 350mm long, with a pressure rating of 300Lb (formerly PN11MPa), and a discharge capacity of approximately 500Kg / h at a maximum pressure difference of 2.8MPa·G. There are currently no similar steam traps in China with a discharge capacity of 900Kg / h, therefore they cannot meet the technical requirements for selecting steam traps for small-volume, high-displacement steam heating equipment. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and propose a lever-type float steam trap that can solve the following technical problems: 1) Achieving a pressure rating of 300Lb and a discharge capacity of 900 kg / h under a working pressure difference of 2.8 MPa·G; 2) Achieving a float with a diameter of 80 mm bearing pressure of 4.2 MPa·G (the float bearing pressure is 1.5 times the nominal pressure); 3) Ensuring reliable switching of the SCCV system; 4) Ensuring force balance when the valve is switched by spring force enhancement; 5) Ensuring force balance when the valve is switched by folding lever force enhancement; 6) Ensuring the float is limited when the steam trap is closed; 7) Ensuring zero steam leakage rate of the high-level water seal under no-load conditions, allowing for continuous proportional drainage under stable load conditions, and enabling switching action under low-load and unstable conditions.

[0004] The present invention provides a lever float type steam trap, the specific structure of which is as follows: the steam trap includes a valve body 4, a float assembly 13-12, a control frame assembly 13, a valve cover 14, and a rectifier assembly 15;

[0005] a. The valve body 4 and the valve cover 14 are fastened together by a double-headed stud 11, a hexagonal nut I 10 and a spring washer 9. A rectifier assembly 15 is installed at the water inlet at the upper end of the valve cover 14. A water inlet pipe 16 is provided at the port of the rectifier assembly 15. The water inlet pipe 16 is connected to the water inlet flange 17.

[0006] b. The control frame assembly 13 is disposed inside the valve body 4 cavity and is fixedly connected to the valve body 4 by hexagonal head bolts I12. The control frame assembly 13 includes a fixed bracket 13-1 that provides connection and support. The fixed bracket 13-1 is connected to connecting rods A13-3 and C13-5 by pins 13-2. Connecting rods A13-3 and C13-5 are connected by connecting rods B13-4 located on the left and right sides by pins 13-2. Connecting rod A13-3 is connected to float assembly 13-12 by pins 13-2. The lower part of the spring 13-6 is connected and fixed to one end of the spring 13-6 by the spring fixing plate 13-7 through hexagonal head bolt II 13-8 and hexagonal nut II 13-9. The other end of the spring 13-6 is set in the spring limiting groove inside the valve body 4. The connecting rod C13-5 is provided with a valve core mounting hole. The valve core 13-10 is set in the valve core mounting hole and fixed and limited by the cotter pin 13-11. The valve core 13-10 extends into the valve seat 8. The valve seat 8 and the valve body 4 are connected by threads. A copper gasket I 7 for sealing is provided at the connection between the two.

[0007] c. An outlet pipe 2 is installed below the valve seat 8 and at the outlet of the lower end of the valve body 4. The outlet pipe 2 is fixedly connected to the outlet flange 1. At the same time, a drain plug 3 connected by threads is provided at the lower end of the valve body 4. A copper gasket II 5 for sealing is provided at the connection between the drain plug 3 and the valve body 4.

[0008] The float assembly 13-12 consists of a float support 13-12-1 located at the lower position and a float 13-12-2 located above the float support 13-12-1.

[0009] The fairing assembly 15 consists of a positioning sleeve 15-1 located at the top, a filter screen body 15-2 fixedly connected to the positioning sleeve 15-1, and a filter screen bottom 15-3 fixedly connected to the filter screen body 15-2 located at the bottom.

[0010] The beneficial effects of this invention are:

[0011] This invention provides users with a small-volume, high-capacity, medium-pressure lever float-type steam trap, suitable for draining condensate from indirect heating equipment. Its key features include a shell (valve body 4, valve cover) with a pressure resistance of 7.5 MPa·G and a differential pressure of 2.8 MPa·G, and a condensate discharge capacity of 900 kg / h; a unique exhaust welding design allows the thin-walled float 13-12-2 (80 mm diameter, δ = 1 mm) to withstand a pressure of 4.2 MPa·G; the combined effect of the SCCV switching system and the high-level water seal structure ensures zero steam leakage under no-load conditions and reliable closure; a unique limit design limits the descent position of the float 13-12-2 when the valve is closed; and a special folding lever force-enhancing structure combined with the spring 13-6 force-enhancing structure increases the opening torque under high pressure, ensuring smooth valve operation and reliable performance. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention.

[0013] Figure 2 for Figure 1 The left view.

[0014] Figure 3 for Figure 1 Top view.

[0015] Figure 4 This is a schematic diagram of the control frame assembly structure.

[0016] Figure 5 for Figure 4 A sectional view.

[0017] Figure 6 for Figure 4 The right view.

[0018] Figure 7 This is a schematic diagram of the float assembly structure.

[0019] Figure 8 This is the front view of the bracket.

[0020] Figure 9 for Figure 8 Top view.

[0021] Figure 10 This is a schematic diagram of the fairing assembly structure.

[0022] Figure 11 This is a schematic diagram of the media air, low-temperature condensate, high-temperature condensate, and steam inside the steam trap cavity of the present invention.

[0023] Figure 12 This is a schematic diagram illustrating the initial operation of the working principle of the present invention.

[0024] Figure 13This is a schematic diagram illustrating the floating state of the float assembly and the drainage valve in the working principle of this invention.

[0025] Figure 14 This is a schematic diagram showing the float assembly in the drainage valve closed state during the fall of the present invention.

[0026] In the diagram: 1. Outlet flange; 2. Outlet pipe; 3. Drain plug; 4. Valve body; 5. Copper gasket II; 7. Copper gasket I; 8. Valve seat; 9. Spring washer; 10. Hex nut I; 11. Double-ended stud; 12. Hex head bolt I; 13. Control frame assembly; 13-1. Fixed bracket; 13-2. Pin; 13-3. Connecting rod A; 13-4. Connecting rod C; 13-5. Spring; 13-6. Spring fixing plate; 13-7. Hex head bolt II; 13-8. Hex nut II; 13-9. Valve core; 13-10. Cotter pin; 13-11. Float assembly; 13-12. Float bracket; 13-12-1. Float; 13-12-2. Valve cover; 14. Radiator assembly; 15. Inlet pipe; 16. Inlet flange; 17. Detailed Implementation

[0027] The following will be combined with the appendix Figure 1-10 The present invention will be further described below.

[0028] The present invention provides a lever float type steam trap, the specific structure of which includes valve body 4, float assembly 13-12, control frame assembly 13, valve cover 14, and rectifier assembly 15.

[0029] a. The valve body 4 and the valve cover 14 are fastened together by a double-ended stud 11, a hexagonal nut I 10 and a spring washer 9. A flow rectifier assembly 15 is installed at the water inlet at the upper end of the valve cover 14. A water inlet pipe 16 is provided at the port of the flow rectifier assembly 15 and is connected to the water inlet flange 17. The flow channel of the valve body 4 and the valve cover 14 is designed in a simple manner, which minimizes the flow resistance of the medium in the steam trap cavity and provides a prerequisite for the reliable operation of the steam trap.

[0030] b. The control frame assembly 13 is disposed inside the valve body 4 cavity and is fixedly connected to the valve body 4 by hexagonal head bolts I12. The control frame assembly 13 includes a fixed bracket 13-1 that provides connection and support. The fixed bracket 13-1 is connected to connecting rods A13-3 and C13-5 by pins 13-2. Connecting rods A13-3 and C13-5 are connected by connecting rods B13-4 located on the left and right sides by pins 13-2. Connecting rod A13-3 is connected to the float assembly 13-12 by pins 13-2. The lower part of connecting rod C13-5 is connected to one end of spring 13-6 by a spring fixing plate 13-7 and hexagonal head bolts. II13-8 and hexagonal nut II13-9 are connected and fixed. The other end of spring 13-6 is set in the spring limiting groove inside the valve body 4. The connecting rod C13-5 has a valve core mounting hole. The valve core 13-10 is set in the valve core mounting hole and fixed and limited by cotter pin 13-11. The valve core 13-10 extends into the valve seat 8. The valve seat 8 and the valve body 4 are connected by threads. The connection between the two is provided with a copper gasket I7 for sealing. The float assembly 13-12 consists of a float bracket 13-12-1 located at the lower position and a float 13-12-2 located above the float bracket 13-12-1.

[0031] The control frame assembly 13, as the core control component of the steam trap, features reliable operation and flexible connection. When condensate enters the valve chamber, the buoyancy generated by the condensate acts on the float 13-12-2, causing the float 13-12-2 to rise and drive the valve core 13-10 away from the valve seat 8, thus opening the steam trap and delivering the condensate to the downstream recovery pipeline through its own medium pressure. When the condensate flows out and steam flows into the valve chamber, the float 13-12-2, relying on its own gravity, drives the valve core 13-10 back onto the valve seat 8, and the steam trap is closed by the SCCV automatic centering and closing system. The unique folding lever design significantly increases the valve opening force, and the folding lever makes the structure more compact, reducing the overall volume of the steam trap. The spring 13-6, with its auxiliary force-enhancing design, offsets part of the medium pressure, reducing the buoyancy required for the float 13-6, thereby reducing the volume of the float and ultimately reducing the overall volume of the steam trap. The two unique designs achieve the design objective of small size and large displacement, as well as the production and usage requirements of this invention.

[0032] The float assembly 13-12 consists of float 13-12-2 and float support 13-12-1. The stainless steel float 13-12-2, with a diameter of Φ80mm and a wall thickness of 1mm, employs a unique venting welding method. This method rapidly dissipates the heat generated within float 13-12-2 during welding, preventing the formation of a vacuum within the float 13-12-2 due to cooling. Excessive vacuum would lower the maximum allowable pressure of float 13-12-2, leading to deformation. This welding method ensures both weld penetration and allows float 13-12-2 to withstand a high pressure of 4.2 MPa·G. The float support 13-12-1 features a unique semi-open spherical design, resulting in a better fit and a more robust and reliable weld when welded to float 13-12-2.

[0033] c. An outlet pipe 2 is installed below the valve seat 8 and at the outlet of the lower end of the valve body 4. The outlet pipe 2 is fixedly connected to the outlet flange 1. At the same time, a drain plug 3 connected by threads is provided at the lower end of the valve body 4. A copper gasket II 5 for sealing is provided at the connection between the drain plug 3 and the valve body 4.

[0034] The rectifier assembly 15 consists of a positioning sleeve 15-1 located at the top, a filter screen body 15-2 fixedly connected to the positioning sleeve 15-1, and a filter screen bottom 15-3 fixedly connected to the filter screen body 15-2 located at the bottom. Its function is to rectify the steam-water mixture from the upstream pipeline and ensure it flows relatively evenly into the valve cavity, reducing the impact of large pressure differentials on the valve cavity during start-up and shutdown, preventing water hammer, and providing some protection for vulnerable components (such as the float).

[0035] The working principle of this invention is as follows: After a lever-type float steam trap is installed on a pipeline, as... Figure 11 , 12 The diagrams for 13 and 14 indicate that automatic operation will begin: Initial state, see attached diagram for details. Figure 12 As shown, no condensate or steam enters the steam trap, but air is present before, inside, and after the valve. This air is displaced. When low-temperature condensate flows smoothly from the inlet flange 17 and inlet pipe 16 into the valve cover 14 cavity, the float assembly 13-12 floats, indicating the drainage state (see attached diagram). Figure 13 As shown; the float assembly 13-12 drives connecting rods C13-5, B13-4, and A13-3, and valve core 13-10 to move upwards. Valve core 13-10 disengages from valve seat 8, and condensate is quickly discharged from outlet flange 1. The float assembly 13-12 in the closed state is shown in the attached figure. Figure 14As shown, as high-temperature condensate and steam flow from the inlet flange into the valve cover 14 cavity, the float assembly 13-12 gradually loses buoyancy as the liquid level falls, driving the connecting rods C13-5, B13-4, A13-3, and valve core 13-10 to move downwards. The valve core 13-10 falls onto the valve seat 8, the steam trap closes, and steam leakage is prevented.

[0036] Based on the above innovative design, while meeting the performance parameters of the shell (valve body 4, valve cover 8), float 13-12-2 pressure requirement of 4.2 MPa·G, discharge capacity of 900 kg / h, maximum back pressure ratio, and no-load leakage rate, this steam trap has a valve volume of only 0.03 m³. 3 .

Claims

1. A lever-type float steam trap, comprising a valve body (4), a float assembly (13-12), a control frame assembly (13), a valve cover (14), and a fairing assembly (15), characterized in that: a. The valve body (4) and the valve cover (14) are fastened together by a double-headed stud (11), a hexagonal nut I (10) and a spring washer (9). A shunting assembly (15) is installed at the water inlet at the upper end of the valve cover (14). A water inlet pipe (16) is provided at the port of the shunting assembly (15). The water inlet pipe (16) is connected to the water inlet flange (17). b. The control frame assembly (13) is located inside the valve body (4) cavity and is fixedly connected to the valve body (4) by hexagonal head bolts I (12). The control frame assembly (13) includes a fixed bracket (13-1) that provides support. The fixed bracket (13-1) is connected to connecting rod A (13-3) and connecting rod C (13-5) by a pin (13-2). Connecting rod A (13-3) and connecting rod C (13-5) are connected by two connecting rods B (13-4) by a pin (13-2). Connecting rod A (13-3) is connected to the float assembly (13-12) by a pin (13-2). The connecting rod C (13-5) The lower part of the spring (13-6) is connected and fixed to one end of the spring (13-6) by a spring fixing plate (13-7) through hexagonal head bolt II (13-8) and hexagonal nut II (13-9). The other end of the spring (13-6) is set in the spring limiting groove inside the valve body (4). The connecting rod C (13-5) is provided with a valve core mounting hole. The valve core (13-10) is set in the valve core mounting hole and fixed and limited by a cotter pin (13-11). The valve core (13-10) extends into the valve seat (8). The valve seat (8) and the valve body (4) are connected by threads. A copper gasket I (5) for sealing is provided at the connection between the two. c. An outlet pipe (2) is installed below the valve seat (8) and at the outlet of the lower end of the valve body (4). The outlet pipe (2) is fixedly connected to the outlet flange (1). At the same time, a drain plug (3) is provided at the lower end of the valve body (4) through a threaded connection. A copper gasket II (7) for sealing is provided at the connection between the drain plug (3) and the valve body (4).

2. The lever-float type steam trap as described in claim 1, characterized in that: The float assembly (13-12) consists of a float support (13-12-1) located at the lower position and a float (13-12-2) located above the float support (13-12-1).

3. A lever-type float steam trap as described in claim 1, characterized in that: The fairing assembly (15) consists of a positioning sleeve (15-1) located at the top, a filter screen body (15-2) fixedly connected to the positioning sleeve (15-1), and a filter screen bottom (15-3) fixedly connected to the filter screen body (15-2) located at the bottom.

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