Floating ball type steam trap suitable for low-pressure working condition

Abstract

The utility model provides a floating ball type steam trap suitable for a low-pressure working condition, and relates to the technical field of valves. The water inlet is connected with a steam pipeline; the water outlet is connected with a condensate pipe network; the first pipe is arranged in the valve body, and the upper end of the first pipe is connected with the water outlet; the second pipe is arranged in the valve body, and the second pipe is provided with a valve seat; the floating ball is movably arranged in the valve body; the valve core is in transmission connection with the valve core and is used for opening or closing the valve seat; a check valve provided to the first pipe; the pressure sensor is mounted at the water outlet; one end of the pressure supplementing pipeline is connected with the water outlet, the other end of the pressure supplementing pipeline is connected with a high-pressure air source, and a pressure supplementing valve is arranged on the pressure supplementing pipeline; the lower end of the second pipe is connected with the lower end of the first pipe to form a U-shaped structure or a V-shaped structure. The pressure sensor is associated with the check valve and the pressure supplementing valve so as to compensate the liquid outlet pressure of the water outlet, and power compensation is provided for flowing of condensate water accumulated in the water outlet and the condensate pipe network.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field especially is applicable to low pressure working condition's float ball type steam trap. BACKGROUND

[0002] The steam trap is applied to the heat exchanger system, the steam trap utilizes the density difference of steam and condensate to realize automatic control: when the condensate enters the steam trap, the float ball floats and drives the valve core to open automatically, and the condensate is discharged, to avoid the problems such as insufficient heating capacity of the heat exchanger due to excessive condensate in the heat exchanger system; when steam enters, the float ball does not float, and the valve is automatically closed to prevent steam leakage. The steam pressure and the back pressure of the steam trap determine the recovery and treatment mode of the condensate, and due to the influence of the structural characteristics of the steam trap, the back pressure rate of the conventional mechanical steam trap is generally 30%-50% of the inlet pressure. The domestic chemical plant usually adopts the local discharge mode for the low-pressure steam condensate.

[0003] The polycrystalline silicon production enterprise involves a large number of low-pressure heating type steam traps (design pressure 2 kg, actual operating pressure about 1.8-1.7 kg), and due to the influence of the process, a large amount of condensate is involved; if the condensate is discharged locally, there is a great waste of resources, so the condensate discharged by the steam trap enters the steam condensate recovery system including the condensate pipe network, that is, a closed loop is formed to recover the condensate; however, under the condition of no shutdown after the device is operated, the pipe resistance of the condensate pipe network cannot be reduced by modifying the pipeline, so that under the condition of a large amount of condensate and low steam pressure, the condensate in the steam trap cannot be discharged in time due to the influence of the pipe resistance of the condensate pipe network, causing liquid accumulation, causing fluctuations in the heat exchanger system, and seriously affecting normal production operation. CONTENT OF THE UTILITY MODEL

[0004] In view of the above problems, the utility model provides a float ball type steam trap suitable for low pressure working condition, which aims at solving the technical problems that the existing device cannot reduce the pipe resistance of the condensate pipe network by modifying the pipeline under the condition of no shutdown after the device is operated, so that under the condition of a large amount of condensate and low steam pressure, the condensate in the steam trap cannot be discharged in time due to the influence of the pipe resistance of the condensate pipe network, causing liquid accumulation, causing fluctuations in the heat exchanger system, and seriously affecting normal production operation.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] The utility model provides a float ball type steam trap suitable for low pressure working condition, which includes:

[0007] The valve body has a water inlet and a water outlet; the water inlet is connected with the steam pipeline; the water outlet is connected with the condensate pipe network;

[0008] The first pipe is arranged in the valve body, and an upper end of the first pipe is connected with the water outlet;

[0009] The second pipe is arranged in the valve body, and the second pipe has a valve seat;

[0010] The floating ball is movably arranged in the valve body;

[0011] The valve core is connected with the valve core transmission for opening or closing the valve seat;

[0012] The check valve is arranged in the first pipe;

[0013] The pressure sensor is installed on the water outlet;

[0014] The pressure compensation pipeline has one end connected with the water outlet and the other end connected with the high-pressure gas source, and the pressure compensation pipeline is provided with a pressure compensation valve;

[0015] Wherein:

[0016] The lower end of the second pipe is connected with the lower end of the first pipe to form a U-shaped structure or a V-shaped structure;

[0017] The outlet of the first pipe is higher than the valve seat of the second pipe;

[0018] The check valve and the pressure compensation valve are associated with the pressure sensor, and the pressure provided by the high-pressure gas source is greater than a preset threshold value of the pressure sensor.

[0019] In some embodiments of the utility model, the height ratio of the first pipe to the second pipe is (1.5-2):1.

[0020] In some embodiments of the utility model, the pressure sensor is installed on the water outlet.

[0021] In some embodiments of the utility model, the included angle between the pressure sensor and the water outlet is 30 DEG.

[0022] In some embodiments of the utility model, the valve body is provided with a support, the support is rotatably connected with a valve rod, and the valve rod and the floating ball are connected with the valve core.

[0023] In some embodiments of the utility model, the support is installed on the top of the second pipe.

[0024] In some embodiments of the utility model, the floating ball is connected with the valve rod through a connecting rod.

[0025] In some embodiments of the utility model, the floating ball is hollow.

[0026] In some embodiments of the utility model, the high-pressure gas source includes high-pressure steam.

[0027] In some embodiments of the utility model, the high-pressure gas source includes high-pressure nitrogen.

[0028] The embodiments of the present application have at least the following advantages or beneficial effects:

[0029] 1. The pressure sensor is associated with the check valve and the pressure compensation valve. When the pressure detected by the pressure sensor at the water outlet is greater than the preset threshold, the check valve is closed to prevent the fluid from flowing back to the first pipe from the water outlet, and the pressure compensation valve is opened to introduce the high-pressure gas source into the water outlet to compensate for the liquid pressure of the water outlet, thereby providing power compensation for the flow of the accumulated condensed water in the water outlet and the condensate pipe network. After the accumulated condensed water in the water outlet and the condensate pipe network is discharged, the pressure compensation valve is closed, and the check valve is opened to enable the above-mentioned drain valve to continue to play a drain role. Thus, the fluctuation of the heat exchanger system caused by the accumulated liquid is avoided, thereby affecting the normal production operation.

[0030] 2. The outlet of the first pipe is higher than the inlet (valve seat) of the second pipe. In this way, the liquid level inside the valve body 1 of the drain valve is increased (the first pipe 2 is higher than the second pipe 3), the self-back pressure (liquid outlet pressure / liquid inlet pressure) of the drain valve is increased, and the adaptability of the above-mentioned drain valve to low-pressure working conditions is improved.

[0031] Other features and advantages of the present application will be described in the following description, and some of them will become apparent from the description, or will be understood by those skilled in the art through implementation of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0033] Figure 1 Structure diagram of the floating ball type steam drain valve suitable for low-pressure working conditions.

[0034] Icon:

[0035] 1- valve body, 11- water inlet, 12- water outlet,

[0036] 2- first pipe, 3- second pipe, 31- valve seat,

[0037] 4- floating ball, 41- support, 42- valve rod, 43- connecting rod,

[0038] 5- valve core, 6- check valve, 7- pressure sensor,

[0039] 8- pressure compensation pipeline, 81- pressure compensation valve. DETAILED DESCRIPTION

[0040] In the following, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present application.

[0041] In the description of the embodiments of the present application, it should be understood that the terms "vertical", "height", "upper", "lower", "top", "inner" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0042] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0043] In the embodiments of the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0044] The embodiments of the present application will be described in detail below.

[0045] Embodiment 1

[0046] Referring to Figure 1 , the present embodiment provides a floating ball 4 type steam trap suitable for low pressure working conditions, which comprises a valve body 1, a first pipe 2, a second pipe 3, a floating ball 4, a valve core 5, a check valve 6, a pressure sensor 7 and a pressure supplementing pipeline 8.

[0047] The valve body 1 has a water inlet 11 and a water outlet 12; the water inlet 11 is connected with the steam pipeline (not shown in the figure) of the heat exchanger system, and the condensed water in the steam pipeline enters the valve body 1 through the water inlet 11; the water outlet 12 is connected with the condensate pipeline network (not shown in the figure).

[0048] The first pipe 2 is vertically arranged in the valve body 1, and the upper end of the first pipe 2 is connected with the water outlet 12.

[0049] The second pipe 3 is vertically arranged in the valve body 1, and the lower end of the second pipe 3 is connected with the lower end of the first pipe 2 to form a U-shaped structure. The middle part of the second pipe 3 has a valve seat 31 on the side wall.

[0050] The floating ball 4 is movably arranged in the valve body 1. The floating ball 4 is hollow.

[0051] The valve core 5 is in driving connection with the valve core 5, and is used for opening or closing the valve seat 31. When the valve seat is opened, the condensed water can enter the second pipe 3 through the hole of the valve seat 31.

[0052] The check valve 6 is arranged in the first pipe 2.

[0053] The pressure sensor 7 is installed at the water outlet 12.

[0054] One end of the pressure supplement pipeline 8 is connected with the water outlet 12, and the other end is connected with a high-pressure gas source. The pressure supplement pipeline 8 is provided with a pressure supplement valve 81, and the pressure supplement valve 81 is an electrically-controlled valve.

[0055] The above-mentioned drain valve realizes the drainage of the steam pipeline in the following way: after the condensed water enters the valve body 1 through the water inlet 11, the hollow floating ball 4 is floated, the floating ball 4 drives the valve core 5, the valve core 5 is separated from the valve seat, the valve seat is opened, the condensed water enters the second pipe 3 and the first pipe 2, and then flows out of the water outlet 12 after passing through the check valve 6, thereby realizing the drainage of the steam pipeline.

[0056] Because of the pressure loss of the water outlet 12 relative to the water inlet 11, and because of the increase of the pipe resistance caused by the accumulation of the condensed water in the water outlet 12 and the condensate pipe network, in the low-pressure working condition (the steam pressure in the steam pipeline connected with the water inlet 11 is low), the outlet pressure of the water outlet 12 is insufficient to drive the condensed water in the water outlet 12 and the condensate pipe network. In order to deal with this situation, the pressure sensor 7 is associated with the check valve 6 and the pressure supplement valve 81. When the pressure detected by the pressure sensor 7 is greater than a preset threshold, the check valve 6 is closed to prevent the fluid from flowing back to the first pipe 2 from the water outlet 12, and at the same time, the pressure supplement valve 81 is opened to supply the high-pressure gas source to the water outlet 12, so as to compensate the outlet pressure of the water outlet 12 and provide power compensation for the flow of the accumulated condensed water in the water outlet 12 and the condensate pipe network. After the condensed water accumulated in the water outlet 12 and the condensate pipe network is discharged, the pressure supplement valve 81 is closed, and the check valve 6 is opened to make the above-mentioned drain valve continue to play the role of drainage. Thus, the fluctuation of the heat exchanger system caused by the liquid accumulation is avoided, and the normal production operation is ensured.

[0057] It can be understood that the pressure provided by the above-mentioned high-pressure gas source should be greater than the preset threshold of the pressure sensor 7, that is, the pressure of the high-pressure gas source should be sufficient to drive the flow of the condensed water accumulated in the water outlet 12 and the condensate pipe network.

[0058] The high-pressure gas source includes high-pressure steam and / or high-pressure nitrogen, and when different high-pressure gas sources are selected, the pressure compensation pipeline 8 is connected with a corresponding pipeline.

[0059] The pressure sensor 7 is obliquely installed at the water outlet 12. In a specific implementation scenario, the included angle a between the pressure sensor 7 and the water outlet 12 is 30°. Such an installation angle makes the interaction between the pressure sensor 7 and the condensed water small, helps to optimize the flow characteristics of the condensed water, reduces error sources, improves the measurement sensitivity and stability, and thus improves the detection accuracy of the pressure sensor 7.

[0060] The condensed water enters the second pipe 3 from the valve seat 31 at the upper portion of the second pipe 3 and enters the water outlet 12 from the upper portion of the first pipe 2. The outlet of the first pipe is higher than the inlet (valve seat 31) of the second pipe. In a specific implementation scenario, the height ratio of the first pipe 2 to the second pipe 3 (the height of the first pipe 2 / the height of the second pipe 3) is (1.5~2):1, preferably 1.5:1. In this way, the liquid level inside the valve body 1 of the trap is increased (the first pipe 2 is higher than the second pipe 3), the self-back pressure of the trap (outlet pressure / inlet pressure) is increased, and thus the ability of the trap to adapt to low-pressure working conditions is improved.

[0061] The valve core 5 and the valve core 5 are drivingly connected in the following manner: a support 41 is arranged in the valve body 1, the support 41 is installed at the top of the second pipe 3, the support 41 is rotationally connected with a valve rod 42, the valve rod 42 is connected with the valve core 5, and the float ball 4 is connected with the valve rod 42 through a connecting rod 43.

[0062] Embodiment 2

[0063] This embodiment is another implementation of the first pipe 2 and the second pipe 3.

[0064] Reference should be made to Figure 1 Different from Embodiment 1, in this embodiment, the first pipe 2 and the second pipe 3 are obliquely arranged and form a V-shaped structure (not shown in the figure), which also conforms to the concept of the present application.

[0065] Finally, it should be noted that the above is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A float and steam trap valve suitable for low pressure service, characterized in that, The utility model relates to a valve for steam trap, comprising: a valve body having a water inlet and a water outlet; the water inlet is connected with a steam pipeline; the water outlet is connected with a condensate pipeline network; a first pipe arranged in the valve body, the upper end of the first pipe being connected with the water outlet; a second pipe arranged in the valve body, the second pipe having a valve seat; a floating ball movably arranged in the valve body; a valve core in driving connection with the valve core for opening or closing the valve seat; a check valve arranged in the first pipe; a pressure sensor installed on the water outlet; a pressure compensation pipeline having one end connected with the water outlet and the other end connected with a high-pressure gas source, the pressure compensation pipeline being provided with a pressure compensation valve; wherein: the lower end of the second pipe is connected with the lower end of the first pipe to form a U-shaped structure or a V-shaped structure; the outlet of the first pipe is higher than the valve seat of the second pipe; the check valve and the pressure compensation valve are associated with the pressure sensor; the pressure provided by the high-pressure gas source is greater than a preset threshold value of the pressure sensor.

2. The float and steam trap valve suitable for low pressure service according to claim 1, characterized in that, the height ratio of the first pipe to the second pipe is (1.5-2):

1.

3. The float and trap valve suitable for low pressure service according to claim 1, wherein, the pressure sensor is obliquely installed on the water outlet.

4. The float and steam trap valve suitable for low pressure service according to claim 3, characterized in that, the included angle between the pressure sensor and the water outlet is 30 degrees.

5. The float and trap valve suitable for low pressure service according to claim 1, wherein, a support is arranged in the valve body, the support being rotatably connected with a valve rod, the valve rod and the floating ball being connected with the valve core.

6. The float and trap valve suitable for low pressure service according to claim 5, wherein, the support is installed on the top of the second pipe.

7. The float and trap valve suitable for low pressure service according to claim 5, wherein, the floating ball is connected with the valve rod through a connecting rod.

8. The float and trap valve suitable for low pressure service according to claim 1, wherein, the floating ball is hollow.

9. The float and trap valve according to any one of claims 1 to 8, characterized in that the high-pressure gas source includes high-pressure steam.

10. The float and trap valve according to any one of claims 1 to 8, wherein the high-pressure gas source includes high-pressure nitrogen.

Images