CN202485289U - Refrigerating system of central air conditioner - Google Patents
Refrigerating system of central air conditioner Download PDFInfo
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- CN202485289U CN202485289U CN2012201019656U CN201220101965U CN202485289U CN 202485289 U CN202485289 U CN 202485289U CN 2012201019656 U CN2012201019656 U CN 2012201019656U CN 201220101965 U CN201220101965 U CN 201220101965U CN 202485289 U CN202485289 U CN 202485289U
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Abstract
The utility model provides a refrigerating system of a central air conditioner, belongs to the technical field of air conditioners, and solves problems that a traditional central air conditioning system is hard to control the preset temperature, is inconvenient to meter the flow rate of liquid and the like. The refrigerating system comprises a refrigerator, a water pump and a cooling tower, wherein the refrigerator and the cooling tower are connected with a return pipe I through a water feeding pipe I, the water pump is arranged on the return pipe I or the water feeding pipe I, the refrigerator is provided with a water feeding pipe II and a return pipe II which are connected with a central air conditioner, a regulating valve for fixing flow rate is arranged on the water feeding pipe I or a part of the water feeding pipe I close to the cooling tower, and a regulating valve for fixing the flow rate is arranged on the water feeding pipe II or a part of the water feeding pipe II close to the refrigerator. The refrigerating system of the central air conditioner, disclosed by the utility model, has the advantages of being convenient to control the flow rate, enabling the flow rate of the interior of a pipe to be constant and the like.
Description
Technical field
The utility model belongs to the air conditioner technical field, relates to a kind of refrigeration system, the refrigeration system in particularly a kind of central air-conditioning.
Background technology
Central air conditioner system is by cold and heat source system, air handling system and end equipment.Refrigeration system is that air handling system provides institute's chilling requirement, in order to offset the refrigeration duty of indoor environment; Heating provides in order to offset the heat of indoor environment thermic load for the air-conditioning regulating system.Air handling system is to be used for the technology of temperature, humidity etc. of the air in the process chamber.End equipment makes to be delivered to the air after handling indoorly through blower fan, replace original air in the time of in inlet chamber.
General central air conditioner system also comprises cooling tower, and cooling tower makes utilize evaporation of water heat absorption principle to leave used heat that central air-conditioning produced guarantee the device of the normal operation of central air conditioner system.
Central air conditioner system generally comprises a plurality of user sides; And common central air conditioner system do not have to be provided with can regime flow or the device of pressure; Make when the user of varying number uses the end equipment of central air conditioner system; Make the pressure in the pipeline non-constant easily, can not control the flow of liquid in the pipeline preferably, thereby be difficult to control temperature and the inconvenient metering that sets fluid flow.
Summary of the invention
The purpose of the utility model is to have the problems referred to above to existing technology, has proposed a kind ofly to be convenient to control flow and can to make the refrigeration system in the central air-conditioning of constant flow in the pipeline.
The purpose of the utility model can realize through following technical proposal: the refrigeration system in a kind of central air-conditioning; Comprise refrigeration machine, water pump and cooling tower; Refrigeration machine and cooling tower link through water inlet pipe one and return pipe one; Above-mentioned water pump is located on return pipe one or the water inlet pipe one, has the water inlet pipe two and return pipe two that are used for linking to each other with central air-conditioning on the said refrigeration machine, it is characterized in that; Said water inlet pipe one or water inlet pipe one are close to the control valve that the cooling tower place is provided with constant flow rate, and described water inlet pipe two or water inlet pipe two are close to the control valve that the refrigeration machine place is provided with constant flow rate.
When work; Refrigeration machine is transported on the central air-conditioning through water inlet pipe two through the power of heat exchange generation cold water through water pump; And through heat exchange indoor temperature is descended, will raise through the cold water temperature of heat exchange, and earlier through return pipe two after return pipe one is transported in the cooling tower cools off; Cooled liquid is got back to refrigeration machine from water inlet pipe one and is lowered the temperature once more, and the freezing and heat exchange of circulation.The cold water that produces on the refrigeration machine is back to return after cooling tower is lowered the temperature and carries out refrigeration cool-down on the refrigeration machine carrying out heat exchange on the central air-conditioning, reduces the load of refrigeration machine, has energy-saving advantages; Because water inlet pipe one and water inlet pipe two places are equipped with the control valve of constant flow rate, therefore, make the liquid that enters into central air-conditioning with enter into liquid on the cooling tower flow can be constant, can arrive set definite value.
In the refrigeration system in above-mentioned central air-conditioning, described control valve is a dynamic balance motor-driven pressure-difference valve.Entrance point and the pressure of water side of dynamic balance motor-driven pressure-difference valve through making valve reaches setting value, is convenient to control the flow of water in the pipeline, arrives the advantage of being convenient to control heat and convenient metering.
In the refrigeration system in above-mentioned central air-conditioning; Described dynamic balance motor-driven pressure-difference valve comprises valve rod, spool, inside is for the valve body of cavity and be connected in the YE on the valve body; Have the entrance point and the port of export that communicate with its inner chamber on the valve body; Spool is positioned at valve body; The inner of valve rod is positioned at valve body and links to each other with spool, and the outer end of valve rod stretches out that valve body links to each other with YE and YE can actuate valve stem move up and down, and also is provided with barrier film in the described valve body; Barrier film is divided into two neighbouring cavitys with valve body: control chamber, water flowing chamber; Have the pod apertures that the valve inleting water end is connected with control chamber on the said valve body, have on the described barrier film when entrance point pressure increases and to reduce the valve opening degree, reduce to increase the governor motion of valve opening degree when entrance point pressure; Described governor motion is a back-moving spring and be connected in the relief piston on the barrier film, and back-moving spring has to move down at regulating piston between relief piston and the valve body and under the elastic force effect at back-moving spring makes port of export opening degree become big trend.
In the refrigeration system in above-mentioned central air-conditioning, be provided with piston rod between described regulating piston and the barrier film, an end and the relief piston of piston rod are connected, and the other end and the barrier film of piston rod are connected.The barrier film quality is softer, can drive the same up and down moved further of piston rod along with the hydraulic pressure in the control chamber is out of shape up and down, and piston rod drives the same moved further of regulating piston.
In the refrigeration system in above-mentioned central air-conditioning; Described governor motion comprises that also one is connected in the valve body and its sidepiece has the guide cylinder of outlet; Above-mentioned spool can be resisted against the guide cylinder upper end and form sealing, and above-mentioned relief piston is positioned at guide cylinder and contacts with the guide cylinder side seal.Cavity between guide cylinder and the regulating piston upper end is the water flowing chamber, and behind the employing guide cylinder, the manufacturability of valve is better, as long as make the precision of guide cylinder and material reach standard, can relax requirement to the technology of valve body.
In the refrigeration system in above-mentioned central air-conditioning, inboard, described guide cylinder lower end has guide part, and above-mentioned piston rod is arranged in the guide part place.To portion piston rod can only be done along it and move up and down, the moving radially of limited piston bar.
In the refrigeration system in above-mentioned central air-conditioning, have the locating part of its sidepiece of protrusion on the described piston rod, and can contact with guide part when the piston rod travel limiter.Piston rod can not unconfinedly move up and down, and not so the deflection of barrier film is excessive will break, when locating part with after guide part contacts, piston rod just can not continue to have moved up.
In the refrigeration system in above-mentioned central air-conditioning, being provided with between described valve rod and the valve body can be with the hermetically-sealed construction of both junction sealings.
In the refrigeration system in above-mentioned central air-conditioning, described hermetically-sealed construction comprises end cap and carbon seal ring, and end cap is threadedly connected on the valve body, and above-mentioned valve rod passes valve gap, described carbon seal ring be enclosed within on the valve rod and be crushed on end cap and valve body between.End cap is the graphite sealing shroud fixedly, and graphite grazing overlaps the clearance seal between valve rod and the valve body, but graphite has self lubricity simultaneously, and the sliding between graphite grazing cover and the valve rod is good.
In the refrigeration system in above-mentioned central air-conditioning, be close to the control valve place on described water inlet pipe one or the water inlet pipe one and also be in series with electric two-way valve.Be in series with electric two-way valve on the described water inlet pipe one, the supporting use of electric two-way valve and temperature controller by temperature controller control motor-driven valve motor, opens or closes valve, realizes that the pipeline of cooling tower and refrigeration machine is communicated with or disconnection.
In the refrigeration system in above-mentioned central air-conditioning, be close to the control valve place on described water inlet pipe two or the water inlet pipe two and also be in series with electric two-way valve.Be in series with electric two-way valve on the described water inlet pipe two, the supporting use of electric two-way valve and temperature controller by temperature controller control motor-driven valve motor, opens or closes valve, realizes that the pipeline of central air-conditioning and refrigeration machine is communicated with or disconnection.
In the refrigeration system in above-mentioned central air-conditioning, described electric two-way valve is a butterfly valve.That butterfly valve has is simple in structure, conveniently opening and closing and good sealing performance advantage.
In the refrigeration system in above-mentioned central air-conditioning, described electric two-way valve is a ball valve.Simple in structure, easy to operate and advantage that fluid resistance is less that ball valve has.
Compared with prior art, the refrigeration system in this central air-conditioning has the following advantages:
1, through dynamic balance motor-driven pressure-difference valve being set, make the inlet channel of the refrigeration system in the central air-conditioning remain at the steady state value that sets, the flow in the more stable control pipeline at water inlet pipe one and water inlet pipe two;
2, through dynamic balance motor-driven pressure-difference valve is set, can measure accurately, be convenient for people to use the Cooling and Heat Source flow on each water inlet pipe.
Description of drawings
Fig. 1 is the structural representation of the refrigeration system in this central air-conditioning.
Fig. 2 is the structural representation of the dynamic balance motor-driven pressure-difference valve of the refrigeration system in this central air-conditioning.
Among the figure, 1, refrigeration machine; 1a, water inlet pipe one; 1b, return pipe one; 1c, water inlet pipe two; 1d, return pipe two; 2, water pump; 3, cooling tower; 4, electric two-way valve; 5, dynamic balance motor-driven pressure-difference valve; 6, valve body; 6a, control chamber; 6b, water flowing chamber; 6c, pod apertures; 6d, entrance point; 6e, the port of export; 7, valve gap; 8, barrier film; 9, plastic presser plate; 10, nut one; 11, piston rod; 12, iron pressing plate; 13, soket head cap screw; 14, elastomeric pad; 15, iron gasket; 16, back-moving spring; 17, locating part; 18, circlip; 19, guide cylinder; 19a, guide part; 20, regulating piston; 21, spool; 22, valve rod; 23, YE.
The specific embodiment
Below be the specific embodiment of the utility model and combine accompanying drawing, the technical scheme of the utility model is done further to describe, but the utility model is not limited to these embodiment.
As shown in Figure 1; Refrigeration system in the central air-conditioning; Comprise refrigeration machine 1, water pump 2 and cooling tower 3, refrigeration machine 1 links through water inlet pipe one 1a and return pipe one 1b with cooling tower 3, and water pump 2 is located on water inlet pipe one 1a; Have on the refrigeration machine 1 and be used for water inlet pipe two 1c and return pipe two 1d that link to each other with central air-conditioning; Water inlet pipe one 1a is close to dynamic balance motor-driven pressure-difference valve 5 and the electric two-way valve 4 that cooling tower 3 places are provided with constant flow rate, and water inlet pipe two 1c are close to dynamic balance motor-driven pressure-difference valve 5 and the electric two-way valve 4 that refrigeration machine 1 place is provided with constant flow rate, and the valve body structure of electric two-way valve 4 adopts butterfly valve.
When work; Refrigeration machine 1 is transported on the central air-conditioning through water inlet pipe two 1c through the power of heat exchange generation cold water through water pump 2; And through heat exchange indoor temperature is descended, will raise through the cold water temperature of heat exchange, and earlier through return pipe two 1d after return pipe one 1b is transported to cooling tower cools off for 3 li; Cooled liquid is got back to refrigeration machine 1 from water inlet pipe one 1a and is lowered the temperature once more, and the freezing and heat exchange of circulation.The cold water that produces on the refrigeration machine 1 is back to return after cooling tower 3 is lowered the temperature and carries out refrigeration cool-down on the refrigeration machine 1 carrying out heat exchange on the central air-conditioning, reduces the load of refrigeration machine 1, has energy-saving advantages.Because water inlet pipe one 1a and water inlet pipe two 1c places are equipped with dynamic balance motor-driven pressure-difference valve 5; Therefore; Make the entrance point of dynamic balance motor-driven pressure-difference valve 5 and the pressure of water side reach setting value; Be convenient to control the flow of water in the pipeline, arrive the advantage of being convenient to control heat and convenient metering.All be in series with electric two-way valve 4 on water inlet pipe one 1a and water inlet pipe two 1c, electric two-way valve 4 and the supporting use of temperature controller by temperature controller control motor-driven valve motor, open or close valve, can realize separately that the pipeline of central air-conditioning and refrigeration machine 1 is communicated with or disconnection.
The operation principle of dynamic balance motor-driven pressure-difference valve 5 is following; As shown in Figure 2; Dynamic balance motor-driven pressure-difference valve 5 comprises valve rod 22, spool 21, inside is for the valve body 6 of cavity and be connected in the YE 23 on the valve body 6; The below of valve body 6 is fixed with valve gap 7, links to each other through soket head cap screw 13 between valve gap 7 and the valve body 6, is arranged with iron gasket 15 and elastomeric pad 14 between soket head cap screw 13 and the valve gap 7 successively.Have the entrance point 6d and the port of export 6e that communicate with its inner chamber on the valve body 6; Spool 21 is positioned at valve body 6; The inner of valve rod 22 is positioned at valve body 6 and links to each other with spool 21, and the outer end of valve rod 22 stretches out that valve body 6 links to each other with YE 23 and YE 23 can actuate valve stem 22 move up and down.Also be provided with barrier film 8 in the valve body 6; Barrier film 8 is divided into two neighbouring cavitys with valve body 6: control chamber 6a, water flowing chamber 6b; Has the pod apertures 6c that valve body 6 water inlet ends are connected with control chamber 6a on the valve body 6; Have on the barrier film 8 when entrance point 6d pressure increases and to reduce valve body 6 port of export 6e opening degrees, reduce to increase the governor motion of valve body 6 port of export 6e opening degrees when entrance point 6d pressure.
Governor motion is back-moving spring 16 and the regulating piston 20 that is located at barrier film 8 tops; Regulate to press between piston and the barrier film 8 and be provided with piston rod 11; One end and the regulating piston 20 of piston rod 11 are connected; The other end of piston rod 11 passes barrier film 8, and the position that this end of piston rod 11 is positioned at barrier film 8 belows is arranged with plastic presser plate 9 and nut 1 successively, and nut is fixed on plastic presser plate 9 on the piston rod 11.Be fixed with a sidepiece in the valve body 6 and have the guide cylinder 19 of outlet, spool 21 can be resisted against guide cylinder 19 upper ends and form sealing, and regulating piston 20 is positioned at guide cylinder 19 and contacts with guide cylinder 19 side seal.Cavity between guide cylinder 19 and regulating piston 20 upper ends is water flowing chamber 6b, and behind the employing guide cylinder 19, the manufacturability of valve is better, as long as make the precision of guide cylinder 19 and material reach standard, can relax requirement to the technology of valve body 6.Inboard, guide cylinder 19 lower end has guide part 19a, and piston rod 11 wears the place with guide part 19a.Guide part 19a can only do piston rod 11 along it and moves up and down, the moving radially of limited piston bar 11.The locating part 17 that has its sidepiece of protrusion on the piston rod 11, and can contact with guide part 19a when piston rod 11 travel limiters 17.Barrier film 8 quality are softer, can drive the same up and down moved further of piston rod 11 along with the hydraulic pressure in the control chamber 6a is out of shape up and down, and piston rod 11 drives regulating piston 20 same moved further.Piston rod 11 can not unconfinedly move up and down, and not so the deflection of barrier film 8 is excessive will break, when locating part 17 with after guide part 19a contacts, piston rod 11 just can not continue to have moved up.
Back-moving spring 16 is between regulating piston 20 and valve body 6 and be set in outside the piston rod 11; One end of back-moving spring 16 leans the bottom at guide cylinder 19; The other end leans on barrier film 8, is provided with iron pressing plate 12 between the bottom of back-moving spring 16 and the barrier film 8, and iron pressing plate 12 is set on the piston rod 11; The lower end of iron pressing plate 12 contacts with barrier film 8, and the main effect of iron pressing plate 12 is to make the lower end contact area of back-moving spring 16 to increase.Be provided with circlip 18 between the lower end of the upper end of back-moving spring 16 and guide cylinder 19, circlip 18 increases the contact area of spring upper end.Regulating piston 20 has the big trend of port of export 6e opening degree change that makes that moves down under the elastic force effect of back-moving spring 16.
During work, YE 23 actuate valve stem 22 move up and down and make spool 21 arrive a preset position, at this moment have the gap that the stream that can supply water passes through between spool 21 and the valve body 6, and make user obtain a constant set flow through this valve this moment.
Current enter into water flowing chamber 6b from the entrance point 6d of valve body, and wherein a part of current get into control chamber through pod apertures 6c simultaneously.When causing the pressure of this valve entrance point 6d to become big in the pipe-line system in different user's use; Pressure in the control chamber is greater than the pressure in the 6b of water flowing chamber, and the pressure reduction between the current in control chamber and the water flowing chamber 6b moves up barrier film 8 deformation, and barrier film 8 drives piston rod 11 and moves up; Piston rod 11 drives regulating piston 20 and moves up; Regulating piston 20 parts stop the outlet on the guide cylinder 19, and the opening degree of valve diminishes, and make the pressure reduction at this valve core 21 two ends not change; In like manner, when the pressure of entrance point 6d diminished, it is big that the opening degree of valve becomes, and makes the pressure reduction at this valve core 21 two ends not change.
Specific embodiment described herein only is that the utility model spirit is illustrated.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from the spirit of the utility model or surmount the defined scope of appended claims.
Although this paper has used terms such as refrigeration machine 1, water inlet pipe one 1a, return pipe one 1b, water inlet pipe 1c, return pipe 1d, water pump 2, cooling tower 3, electric two-way valve 4, dynamic balance motor-driven pressure-difference valve 5, valve body 6, control chamber 6a, water flowing chamber 6b, pod apertures 6c, entrance point 6d, port of export 6e, valve gap 7, barrier film 8, plastic presser plate 9, nut 1, piston rod 11, iron pressing plate 12, soket head cap screw 13, elastomeric pad 14, iron gasket 15, back-moving spring 16, locating part 17, circlip 18, guide cylinder 19, guide part 19a, regulating piston 20, spool 21, valve rod 22, YE 23 morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain the essence of the utility model more easily; It all is contrary with the utility model spirit being construed to any additional restriction to them.
Claims (10)
1. the refrigeration system in the central air-conditioning; Comprise refrigeration machine (1), water pump (2) and cooling tower (3); Refrigeration machine (1) links through water inlet pipe one (1a) and return pipe one (1b) with cooling tower (3); Above-mentioned water pump (2) is located on return pipe one (1b) or the water inlet pipe one (1a), has on the said refrigeration machine (1) to be used for the water inlet pipe two (1c) and the return pipe two (1d) that link to each other with central air-conditioning, it is characterized in that; Said water inlet pipe one (1a) or water inlet pipe one (1a) are close to the control valve that cooling tower (3) locates to be provided with constant flow rate, and described water inlet pipe two (1c) or water inlet pipe two (1c) are close to the control valve that refrigeration machine (1) locates to be provided with constant flow rate.
2. the refrigeration system in the central air-conditioning according to claim 1 is characterized in that, described control valve is dynamic balance motor-driven pressure-difference valve (5).
3. the refrigeration system in the central air-conditioning according to claim 2; It is characterized in that; Described dynamic balance motor-driven pressure-difference valve (5) comprises valve rod (22), spool (21), inside is for the valve body of cavity (6) and be connected in the YE (23) on the valve body (6); Have the entrance point (6d) and the port of export (6e) that communicate with its inner chamber on the valve body (6); Spool (21) is positioned at valve body (6); The inner of valve rod (22) is positioned at valve body (6) and links to each other with spool (21), and the outer end of valve rod (22) stretches out that valve body (6) links to each other with YE (23) and YE (23) can actuate valve stem (22) move up and down, and also is provided with barrier film (8) in the described valve body (6); Barrier film (8) is divided into two neighbouring cavitys with valve body (6): control chamber (6a), water flowing chamber (6b); Have the pod apertures (6c) that valve body (6) water inlet end is connected with control chamber (6a) on the said valve body (6), have on the described barrier film (8) when entrance point (6d) pressure increases and to reduce the valve opening degree, reduce to increase the governor motion of valve opening degree when entrance point (6d) pressure; Described governor motion is back-moving spring (16) and is connected in the relief piston on the barrier film (8), back-moving spring (16) be positioned between relief piston and the valve body (6) and under the elastic force effect of back-moving spring (16) regulating piston (20) have to move down and make the port of export (6e) opening degree become big trend.
4. the refrigeration system in the central air-conditioning according to claim 3; It is characterized in that; Be provided with piston rod (11) between described regulating piston (20) and the barrier film (8), an end and the relief piston of piston rod (11) are connected, and the other end of piston rod (11) and barrier film (8) are connected.
5. the refrigeration system in the central air-conditioning according to claim 3; It is characterized in that; Described governor motion comprises that also one is connected in the valve body (6) and its sidepiece has the guide cylinder (19) of outlet; Above-mentioned spool (21) can be resisted against guide cylinder (19) upper end and form sealing, and above-mentioned relief piston is positioned at guide cylinder (19) and contacts with guide cylinder (19) side seal.
6. the refrigeration system in the central air-conditioning according to claim 5 is characterized in that, described guide cylinder (19) inboard, lower end has guide part (19a), and above-mentioned piston rod (11) is arranged in guide part (19a) and locates.
7. the refrigeration system in the central air-conditioning according to claim 6 is characterized in that, has the locating part (17) of its sidepiece of protrusion on the described piston rod (11), and can contact with guide part (19a) when piston rod (11) travel limiter (17).
8. according to the refrigeration system in claim 3 or 4 or 5 or the 6 or 7 described central air-conditioning; It is characterized in that; Being provided with between described valve rod (22) and the valve body (6) can be with the hermetically-sealed construction of both junction sealings, and described hermetically-sealed construction comprises end cap and carbon seal ring, and end cap is threadedly connected on the valve body (6); Above-mentioned valve rod (22) passes valve gap (7), and described carbon seal ring is enclosed within valve rod (22) and goes up and be crushed between end cap and the valve body (6).
9. the refrigeration system in the central air-conditioning according to claim 1 is characterized in that, is close to the control valve place on described water inlet pipe one (1a) or the water inlet pipe one (1a) and also is in series with electric two-way valve (4).
10. the refrigeration system in the central air-conditioning according to claim 1 is characterized in that, is close to the control valve place on described water inlet pipe two (1c) or the water inlet pipe two (1c) and also is in series with electric two-way valve (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201019656U CN202485289U (en) | 2012-03-16 | 2012-03-16 | Refrigerating system of central air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201019656U CN202485289U (en) | 2012-03-16 | 2012-03-16 | Refrigerating system of central air conditioner |
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| Publication Number | Publication Date |
|---|---|
| CN202485289U true CN202485289U (en) | 2012-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201019656U Expired - Fee Related CN202485289U (en) | 2012-03-16 | 2012-03-16 | Refrigerating system of central air conditioner |
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| CN (1) | CN202485289U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111649538A (en) * | 2020-07-06 | 2020-09-11 | 上海交通大学医学院附属第九人民医院 | Cooling water circulation main machine |
-
2012
- 2012-03-16 CN CN2012201019656U patent/CN202485289U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111649538A (en) * | 2020-07-06 | 2020-09-11 | 上海交通大学医学院附属第九人民医院 | Cooling water circulation main machine |
| CN111649538B (en) * | 2020-07-06 | 2024-04-26 | 上海交通大学医学院附属第九人民医院 | Cooling water circulation host |
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Granted publication date: 20121010 Termination date: 20170316 |
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| CF01 | Termination of patent right due to non-payment of annual fee |