Sealing liquid feeder and sealing device

Abstract

The utility model discloses a sealing liquid feeder and a sealing device, and relates to the field of chemical safety equipment, the sealing liquid feeder comprises a feeder main body, the feeder main body is provided with a liquid inlet and a liquid outlet, the liquid inlet is communicated with the liquid outlet of a sealing cavity, the liquid outlet is communicated with the liquid inlet of the sealing cavity, and the liquid inlet is provided with a pressure gauge and a thermometer. A heat exchange device is arranged in the feeder main body, the feeder main body further comprises a pressure gas injection port, the feeder main body can cool the sealing liquid and monitor the temperature and pressure of the sealing liquid, and the sealing reliability is judged according to the temperature and pressure of the sealing liquid. The utility model further provides a sealing device which comprises the sealing liquid feeder, the pump shaft extending into the pump cover is strictly sealed, the circulating sealing liquid can extrude chemical products leaked after the first-stage sealing fails back into the pump body, and meanwhile the circulating sealing liquid can have the function of reducing the temperature of a sealing pair. And the sealing reliability can be judged through the temperature and pressure of the sealing liquid.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of chemical safety equipment, in particular to a sealed liquid supply device and sealed device. BACKGROUND

[0002] Liquid or gaseous chemical products often use pumping transportation in production and transportation, most of which are toxic and have the characteristics of high temperature, high pressure and high corrosion, so leakage must be avoided, and therefore the sealing structure of the chemical product pumping device is often more complex than that of ordinary pumping devices. For example, an ultrahigh-temperature concentrated sulfuric acid chemical centrifugal pump is a special centrifugal pump used for transporting high-temperature and high-concentration sulfuric acid. In order to meet the sealing needs, a tandem double-end-face mechanical sealing device is connected in the pump cover to strictly seal the pump shaft extending into the pump cover. In the tandem double-end-face mechanical sealing device, two sets of sealing ring assemblies are installed along the axial direction of the pump cover in sequence, the sealing pair between the two sets of sealing ring assemblies and the pumping ring combination form a sealing cavity, and circulating and pressurized sealing liquid is introduced into the sealing cavity. In the tandem double-end-face mechanical sealing device, the medium-end sealing ring assembly on the side close to the pump body serves as the first-stage seal and directly contacts the transported chemical product. The sealing liquid in the cavity serves as the second-stage seal, and the pressure value of the sealing liquid is greater than that of the transported chemical product. When the first-stage seal fails, the second-stage seal can press the chemical product back into the pump to avoid leakage.

[0003] The sealing liquid can absorb heat and cool the sealing structure, but since the liquid medium is in circulation, heat will continuously accumulate in the sealing liquid, resulting in a decrease in the heat absorption and cooling capacity of the sealing liquid. In addition, when the second-stage seal is activated, the sealing liquid will also enter the pump, affecting the product quality. In the prior art, the activation of the second-stage seal cannot be directly discovered, and only when the quality problem of the chemical product is discovered can it be found that the second-stage seal has been activated and the first-stage seal has been damaged. In severe cases, the chemical product may even leak due to complete depletion of the sealing liquid. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a sealing liquid supply device to solve the above-mentioned problems in the prior art, cool the circulating sealing liquid, monitor the temperature and pressure of the sealing liquid, and judge the sealing reliability through the temperature and pressure of the sealing liquid.

[0005] The utility model also provides a sealing device comprising the above-mentioned sealing liquid supply device, which strictly seals the pump shaft extending into the pump cover. The circulating sealing liquid can press the leaked chemical product back into the pump body after the first-stage seal fails, and at the same time, the circulating sealing liquid can reduce the temperature of the sealing pair. The sealing reliability can also be judged through the temperature and pressure of the sealing liquid.

[0006] To achieve the above-mentioned purpose, the utility model provides the following scheme:

[0007] The utility model provides a kind of sealed liquid feeder, including feeder main body, the feeder main body is provided with liquid inlet and liquid outlet, the liquid inlet is connected with sealed cavity liquid outlet, the liquid outlet is connected with the liquid inlet of sealed cavity, pressure gauge and thermometer are provided at the liquid inlet, heat exchange device is provided in the feeder main body, the feeder main body further includes pressure gas injection port.

[0008] In an embodiment, the liquid inlet is arranged above the liquid outlet.

[0009] In an embodiment, the liquid inlet and / or the liquid inlet are connected with a pump, the liquid inlet is communicated with the pump outlet, and the outlet is communicated with the pump liquid inlet.

[0010] In an embodiment, the liquid outlet is communicated with the liquid inlet of the sealed cavity through a pipe with a first valve.

[0011] In an embodiment, the pressure gas injection port is connected with a pipe with a second valve.

[0012] In an embodiment, the feeder main body is provided with a liquid supplementing port, the liquid supplementing port is connected with a pipe with a third valve, and the pipe with a valve is connected with a liquid supplementing funnel.

[0013] In an embodiment, the heat exchange device is a spiral heat exchange pipe, and the cooling medium inlet and the cooling medium outlet of the spiral heat exchange pipe extend out of the feeder main body.

[0014] In an embodiment, the feeder main body is provided with a transparent liquid level window, and the liquid level window is provided with a liquid level line; the feeder main body is provided with a liquid level monitoring device.

[0015] The utility model also provides a kind of sealed device, including mechanical seal structure and above-mentioned sealed liquid feeder, the mechanical seal structure includes medium end sealing ring assembly and atmosphere end sealing ring assembly, the medium end sealing ring assembly and the atmosphere end sealing ring assembly are coaxially spaced apart, the medium end sealing ring assembly and the atmosphere end sealing ring assembly opposite end face form sealing pair, pumping ring is connected the sealing pair and forms the sealed cavity.

[0016] In an embodiment, the medium end sealing ring assembly includes a first bellow, a first dynamic ring seat, a first dynamic ring and a first static ring arranged in sequence, the atmosphere end sealing ring assembly includes a second bellow, a second dynamic ring seat, a second dynamic ring and a second static ring arranged in sequence, and one end of the first static ring forms the sealing pair with one end of the second bellow.

[0017] The utility model has achieved the following technical effects compared with the prior art:

[0018] The utility model provides a kind of sealed liquid feeder, pressure gauge and thermometer are arranged at liquid inlet, the pressure and temperature of the sealed liquid flowing into the main body of feeder can be monitored in real time, when the monitored pressure and temperature are simultaneously increased and exceed threshold value, it can be directly identified that the first level seal in pump cover has failed, and the second level seal starts to work, without waiting until chemical product detection is unqualified or even leakage occurs to find the problem, timely maintenance is carried out to the seal failure position.Heat exchange device can cool the circulating sealed liquid, so that the sealed liquid can continuously absorb heat from the sealing pair, prolonging the service life of mechanical seal.

[0019] The other technical solutions of the utility model have achieved the following technical effects compared with the prior art:

[0020] 1、in the utility model, liquid inlet is arranged above liquid outlet, the sealed liquid in the main body of feeder flows out of liquid outlet into sealing cavity under the action of its own gravity, and the density of the sealed liquid decreases after absorbing heat in the sealing cavity, and it naturally rises until it leaves the sealing cavity and enters the liquid inlet.The heat of the hot sealed liquid back into the main body of feeder is released, and the density decreases and sinks, and the cold liquid and hot liquid generate natural convection, and the sealed liquid can circulate without the need for a delivery device using siphon action.

[0021] 2、in the utility model, the heat exchange device is a spiral heat exchange pipe, and the circulation of the sealed liquid can be realized by passing low-temperature heat exchange medium into the spiral heat exchange pipe, and the spiral heat exchange pipe can provide a large heat dissipation area in a limited space, with high heat exchange efficiency and good effect.

[0022] 3、in the utility model, a transparent liquid level window is arranged on the main body of feeder, and a liquid level line is arranged on the liquid level window to intuitively show the total amount of the sealed liquid, and when the amount of the sealed liquid decreases exceeds the threshold value, it can be determined that the first level seal in the pump cover has failed, and the second level seal starts to work.The liquid level monitoring device can automatically monitor the change of liquid level, and when the liquid level of the sealed liquid decreases exceeds the threshold value, the liquid level monitoring device can issue an alarm and send an abnormal state signal to the master control device, and timely maintenance is carried out to the seal failure position.

[0023] 4、the utility model also provides a sealing device, which comprises an atmospheric end seal ring assembly, a medium end seal ring assembly and the above-mentioned sealed liquid feeder, the opposite end faces of the atmospheric end seal ring assembly and the medium end seal ring assembly form a sealing pair, the pumping sealing pair forms the sealing cavity, the medium end seal ring assembly as the first level seal directly contacts the pumped chemical product, and the circulating sealed liquid as the second level seal can extrude the leaked chemical product back into the pump body after the first level seal fails, and the circulating sealed liquid can also reduce the temperature of the sealing pair, and the reliability of the seal can also be judged by the temperature and pressure of the sealed liquid. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below are only some of the embodiments of the present application, and not all. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0025] Fig. 1 The overall structure of a sealed liquid supply device is shown in the embodiment of the present application.

[0026] Fig. 2 The structure of a sealed liquid supply device containing a local interior is shown in the embodiment of the present application.

[0027] Fig. 3 The cross-sectional structure of a pump cover provided with a mechanical sealing structure is shown in the embodiment of the present application.

[0028] 1, supply device main body; 3, liquid inlet; 4, liquid outlet; 5, pressure gauge; 6, temperature gauge; 7, heat exchange device; 8, pressure gas injection port; 9, first valve; 10, second valve; 11, liquid supplement port; 12, third valve; 13, liquid supplement funnel; 14, liquid level window; 15, pumping ring; 17, first bellows; 18, first moving ring seat; 19, first moving ring; 20, first stationary ring; 22, second bellows; 23, second moving ring seat; 24, second moving ring; 25, second stationary ring; 26, cooling medium inlet; 27, cooling medium outlet. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present specification. Obviously, the described embodiments are only some of the embodiments of the present application, and not all. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0030] It is to be understood that the structure, proportion, size and the like shown in the drawings of the present application are only used to cooperate with the disclosed content, to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present application, so they do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose of the present application, should still fall within the scope of the disclosed technology. In the description of the present application, it is to be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application, and do not indicate or imply that the devices or elements referred to must have a particular orientation, structure and operation, therefore it cannot be understood as a limitation of the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes, and cannot be understood as indicating or implying relative importance. Therefore, the features limited by "first", "second" and the like can be explicitly or implicitly included one or more features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0031] It should be noted that the same reference numerals in the embodiments of the present application represent the same components or the same parts.

[0032] The purpose of the present application is to provide a sealed liquid supply device to solve the problems existing in the prior art, to cool the circulating sealed liquid, and to monitor the temperature and pressure of the sealed liquid, and to judge the sealing reliability by the temperature and pressure of the sealed liquid.

[0033] The present application also provides a sealing device, which comprises the above-mentioned sealed liquid supply device, and strictly seals the pump shaft extending into the pump cover. The circulating sealed liquid can extrude the leaked chemical products back into the pump body after the first stage sealing failure, and at the same time, the circulating sealed liquid can reduce the temperature of the sealing pair, and the sealing reliability can also be judged by the temperature and pressure of the sealed liquid.

[0034] In order to make the above-mentioned purpose, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0035] Example 1

[0036] As Figs. 1-3As shown, the utility model provides a kind of sealed liquid feeder, including feeder main body 1, and the feeder main body 1 is provided with the liquid inlet 3 and the liquid outlet 4 of the communication feeder main body 1, and the liquid inlet 3 is connected with the sealed cavity liquid outlet, and the liquid outlet 4 is connected with the sealed cavity liquid inlet, and pressure gauge 5 and temperature gauge 6 are arranged at the liquid inlet 3, and heat exchange device 7 is arranged in the feeder main body 1, and the feeder main body 1 further includes pressure gas injection port 8.

[0037] Working principle:

[0038] Firstly, a certain amount of sealing liquid is injected into the feeder main body 1, then the liquid inlet 3 and the sealed cavity liquid outlet are connected, the liquid outlet 4 and the sealed cavity liquid outlet are connected to form a circulation loop, and then pressure gas is added into the feeder main body 1 from the pressure gas injection port 8 until the measured value of the pressure gauge 5 reaches the working standard, the pressure gas injection port 8 is closed, the sealing of each interface is maintained, and the sealing liquid is circulated. The high-temperature sealing liquid returning from the sealed cavity to the feeder main body 1 is in contact with the heat exchange device 7 to reduce the temperature, and the cooled sealing liquid returns to the sealed cavity for sealing and cooling.

[0039] The pressure gauge 5 and the temperature gauge 6 arranged at the liquid inlet 3 can monitor the pressure and temperature of the sealing liquid flowing into the feeder main body 1 in real time, when the monitored pressure and temperature simultaneously increase and exceed the threshold value, it can be directly determined that the first-stage sealing in the pump cover has failed and the second-stage sealing starts to work, without waiting for the chemical product detection to be unqualified or even leakage to find the problem, and the sealing failure position can be repaired in time.

[0040] In one embodiment, the sealing liquid can be water, white oil or other liquid that is not easy to compress and has stable chemical properties.

[0041] In one embodiment, the pressure gas is preferably nitrogen, and the pressure gas can also be other gas that is stable in chemical properties, insoluble in the sealing liquid and not easy to compress.

[0042] In one embodiment, the pressure gauge 5 and the temperature gauge 6 are both provided with an alarm, when the monitored pressure and temperature simultaneously increase and exceed the threshold value, the pressure gauge 5 and the temperature gauge 6 can both issue an alarm. The pressure gauge 5 and the temperature gauge 6 can also directly send an abnormal state signal to the general control device to stop the work of the pump body when a problem occurs.

[0043] In one embodiment, the liquid inlet 3 is arranged above the liquid outlet 4. The sealing liquid in the supply body 1 flows out of the liquid outlet 4 under the action of its own gravity into the sealing cavity, and after absorbing heat in the sealing cavity, the density of the sealing liquid decreases and it naturally rises until it leaves the sealing cavity and enters the liquid inlet 3. The hot sealing liquid returning to the supply body 1 releases heat and its density decreases, so it sinks. Thus, natural convection of the cold liquid and the hot liquid is generated, and the sealing liquid can circulate without a conveying device by using the siphon effect.

[0044] In one embodiment, the liquid inlet 3 and / or the liquid inlet 4 are connected with a pump, the liquid inlet 3 is in communication with the pump outlet, and the liquid outlet 4 is in communication with the pump inlet. Pumping can improve the operation efficiency of the sealing liquid. When the heat generation in the sealing cavity is relatively large and the siphon circulation speed cannot meet the heat dissipation requirement, the pumping mode can be used to speed up the circulation speed. When the heat generation in the sealing cavity is too low to generate a siphon effect of sufficient strength, the pumping mode can also be used to speed up the circulation speed.

[0045] In one embodiment, the liquid outlet 4 is in communication with the liquid inlet of the sealing cavity through a pipe element with a first valve 9. The first valve 9 can be a stop valve, a solenoid valve, an electric valve or other devices that can control the opening and closing of the pipe element.

[0046] In one embodiment, the pressure gas injection inlet 8 is connected with a pipe element with a second valve 10. The second valve 10 can be a stop valve, a solenoid valve, an electric valve or other devices that can control the opening and closing of the pipe element.

[0047] In one embodiment, the supply body 1 is provided with a liquid supplementing port 11, the liquid supplementing port 11 is connected with a pipe element with a third valve 12, and the pipe element with the valve is connected with a liquid supplementing funnel 13. When the total amount of the sealing liquid in the supply body 1 decreases, the liquid supplementing port can be used to supplement the liquid without cutting off the communication between the liquid inlet pipe and the sealing cavity. When supplementing the liquid, the third valve 12 is first opened, and after the pressure gas is released and the pressure in the supply body 1 is consistent with the external environment, a sufficient amount of sealing liquid is poured into the liquid supplementing funnel 13, and after the supplementing is completed, the pressure gas is filled into the supply body 1 until the measured value of the pressure gauge 5 reaches the working standard. In this process, the sealing liquid supply device can not stop working, thereby ensuring the continuous cooling of the sealing cavity.

[0048] In one embodiment, the heat exchange device 7 is a spiral heat exchange pipe, and the cooling medium inlet 26 and the cooling medium outlet 27 of the spiral heat exchange pipe extend out of the supply body 1. Heat exchange fins can be arranged on the spiral heat exchange pipe. The spiral heat exchange pipe can provide a large heat dissipation area in a limited space, and has high heat exchange efficiency and good effect.

[0049] In one embodiment, the supply body 1 is provided with a transparent liquid level window 14, the liquid level window 14 is provided with a liquid level line, and the supply body 11 is provided with a liquid level monitoring device. The liquid level window 14 can intuitively show the total amount of sealing liquid. When the reduction amount of the sealing liquid exceeds a threshold value, it can be determined that the first-stage sealing in the pump cover has failed and the second-stage sealing starts to work. The liquid level monitoring device can automatically monitor the change of the liquid level. When the liquid level of the sealing liquid decreases beyond the threshold value, the liquid level monitoring device can issue an alarm and send an abnormal state signal to the general control device, so as to timely maintain the sealing failure position. The liquid level monitoring device can be an infrared monitoring device or other devices capable of detecting the liquid level and issuing an alarm.

[0050] Embodiment 2

[0051] As shown in Figs. 1-3 The utility model also provides a sealing device which comprises a mechanical sealing structure and the sealing liquid supply device, the mechanical sealing structure comprises a medium end sealing ring assembly and an atmosphere end sealing ring assembly, the medium end sealing ring assembly and the atmosphere end sealing ring assembly are coaxially and spacedly arranged, the opposite end faces of the medium end sealing ring assembly and the atmosphere end sealing ring assembly form a sealing pair, and the pumping ring 15 is connected to the sealing pair to form a sealing cavity. The pump shaft penetrates through the atmosphere end sealing ring assembly and the medium end sealing ring assembly and is in close contact with the atmosphere end sealing ring assembly and the medium end sealing ring assembly, and then the sealing liquid is filled in the sealing cavity to complete the sealing.

[0052] Working principle:

[0053] The medium end sealing ring assembly serves as the first-stage sealing and directly contacts the pumped chemical products, the circulating sealing liquid serves as the second-stage sealing and can extrude the chemical products leaked after the first-stage sealing fails back into the pump body, and the circulating sealing liquid can also reduce the temperature of the sealing pair and can judge the sealing reliability through the temperature and pressure of the sealing liquid.

[0054] In one embodiment, the medium end sealing ring assembly comprises a first bellows 17, a first dynamic ring seat 18, a first dynamic ring 19 and a first static ring 20 which are sequentially arranged, the atmosphere end sealing ring assembly comprises a second bellows, a second dynamic ring seat, a second dynamic ring and a second static ring which are sequentially arranged, and one end of the first static ring forms a sealing pair with one end of the second bellows. The static ring is a static sealing device, the pump shaft is in friction with the static ring to generate heat. The dynamic ring rotates together with the pump shaft to form a dynamic sealing. The bellows can provide radial pressure to compress the static ring and the dynamic ring in the radial direction and prevent the static ring and the dynamic ring from moving in the radial direction.

[0055] In one embodiment, the first dynamic ring, the first static ring 20, the second dynamic ring 24 and the second static ring 25 are each provided with a sealing ring.

[0056] It should be noted that, for those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be considered as limiting the claims involved.

[0057] The principles and implementation modes of the present application are described by applying specific examples in the present application. The above embodiment description is only used to help understand the method and core idea of the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there will be changes in specific implementation modes and application ranges. In conclusion, the content of the present application should not be understood as a limitation of the present application.

Claims

1. A sealed fluid supply, characterized by: The application relates to a sealed liquid supply device, which comprises a supply body (1) provided with a liquid inlet (3) and a liquid outlet (4), the liquid inlet (3) being communicated with the sealed cavity outlet, the liquid outlet (4) being communicated with the sealed cavity liquid inlet, a pressure gauge (5) and a temperature gauge (6) being arranged at the liquid inlet (3), a heat exchange device (7) being arranged in the supply body (1), and the supply body (1) further comprising a pressure gas injection inlet (8).

2. The sealed fluid supply of claim 1, wherein: The liquid inlet (3) is arranged above the liquid outlet (4).

3. The sealed fluid supply of claim 1 or 2, wherein: The liquid inlet (3) and / or the liquid outlet (4) are connected with a pump, the liquid inlet (3) being communicated with the pump outlet, and the liquid outlet (4) being communicated with the pump liquid inlet.

4. The sealed fluid supply of claim 1, wherein: The liquid outlet (4) is communicated with the sealed cavity liquid inlet through a pipe provided with a first valve (9).

5. The sealed fluid supply of claim 1, wherein: The pressure gas injection inlet (8) is connected with a pipe provided with a second valve (10).

6. The sealed fluid supply of claim 1, wherein: A liquid supplementing inlet (11) is arranged on the supply body (1), the liquid supplementing inlet (11) being connected with a pipe provided with a third valve (12), and the pipe provided with the valve being connected with a liquid supplementing funnel (13).

7. The sealed fluid supply of claim 1, wherein: The heat exchange device (7) is a spiral heat exchange pipe, and a cooling medium inlet (26) and a cooling medium outlet (27) of the spiral heat exchange pipe are arranged outside the supply body (1).

8. The sealed fluid supply of any one of claims 1, 2, or 4-7, wherein: A transparent liquid level window (14) is arranged on the supply body (1), and a liquid level line is arranged on the liquid level window (14). A liquid level monitoring device is arranged in the supply body (1).

9. A sealing device, characterized by: The application further relates to a mechanical seal structure and a sealed liquid supply device, wherein the mechanical seal structure comprises a medium end seal ring assembly and an atmosphere end seal ring assembly, the medium end seal ring assembly and the atmosphere end seal ring assembly are coaxially and spacedly arranged, opposite end faces of the medium end seal ring assembly and the atmosphere end seal ring assembly form a seal pair, a pumping ring (15) is connected with the seal pair to form the sealed cavity.

10. The sealing device of claim 9, wherein: The medium end seal ring assembly comprises a first bellows (17), a first dynamic ring seat (18), a first dynamic ring (19) and a first static ring (20) arranged in sequence, the atmosphere end seal ring assembly comprises a second bellows (22), a second dynamic ring seat (23), a second dynamic ring (24) and a second static ring (25) arranged in sequence, and one end of the first static ring (20) and one end of the second bellows (22) form the seal pair.

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