WO2019097393A1

WO2019097393A1 - Water heater

Info

Publication number: WO2019097393A1
Application number: PCT/IB2018/058886
Authority: WO
Inventors: 孙祈康
Original assignee: 孙祈康
Priority date: 2017-11-15
Filing date: 2018-11-13
Publication date: 2019-05-23
Also published as: SG11202004248XA

Abstract

A water heater, comprising: an approximately elongated and/or tubular water inlet pipe that extends into a water storage container and comprises at least one rotatably provided or mounted blade device; and/or a water pressure reutilizing and flow guide device that comprises movably and lockably connected or mounted elastic components and is configured to be switched between an energy storage state and a flow guide state by utilizing the changes in water temperature, water flow, and/or water pressure.

Description

\¥0 2019/097393 ?€1/162018/058886

Water heater

Technical field

The present disclosure relates to a water heater, and more particularly to a water heater for a cleaning device, such as a dishwasher, including means for generating a water flow using changes in internal pressure of a system water storage container and helping to prevent or reduce heat loss. Double sealed wall or shell.

Background technique

There are a variety of dishwashers on the market today that require heating water to a certain level to run the cleaning process. The heating device generally adopts a water storage type electric water heater, uses a water tank to store water, and internally uses an electric heating tube to heat the inflow water to rinse and rinse the two parts of the dish. Since the influent heating time is long, energy consumption and cost are high, energy saving control is required for long-term operation. Nowadays, heat recovery systems (such as CN 105615809 8) are generally used in the market to preheat the influent water by using the residual heat of the steam, or to use the waste heat of the sewage recovery tank to preheat the influent water (eg, 0 05748012 8). However, in the final rinsing procedure, due to the particularly stringent hygiene requirements, it is required that the incoming water should not be contaminated and the temperature should not be lower than _85° (:.

Summary of the invention

A water heater is disclosed that includes: \¥0 2019/097393 ? 1/162018/058886 substantially elongated and _/ or tubular extending into the water storage container and preferably at or adjacent to the end of the water storage container An inlet pipe extending parallel or substantially parallel to an end surface of the end portion, the inlet pipe being configured to extend substantially along substantially the entire height direction of the water storage container and including at least one blade device rotatably disposed or mounted The blade device has a plurality of inner blades and outer blades operatively connected, and at least one of the inner blades and _/ or the outer blades has a leaf surface configured to be obliquely disposed and associated with the water inlet pipe The flow direction of the water flow intersects at a predetermined angle to convert and rotate around the shaft by the force of the water flow in the water inlet pipe and to flow water in the vicinity of the periphery of the water inlet pipe in a first predetermined direction; the first predetermined direction is preferably Roughly parallel to the height direction;

And _/ or a hydraulic re-use and flow guiding device comprising an elastic member that is movably and lockably connected or mounted and configured to be switchable in an energy storage state and guided by water temperature, water flow, and _/ or water pressure change Transition between flow states; wherein, in the energy storage state, the water pressure reuse and flow guiding device drives or compresses and locks the elastic member in position by water pressure or water flow to store kinetic energy converted from water pressure or water flow In the diversion state, the water pressure reuse and the flow guiding device release the elastic member, and the repulsive force or the stored kinetic energy of the elastic member drives the water to flow in the second predetermined direction, so that the water storage container is inside The different temperatures of the water can be rapidly mixed to help achieve thermal equilibrium. The second predetermined direction is preferably parallel to the length or width or thickness direction of the water storage container; and _/ or the second predetermined direction is preferred It is orthogonal to the first predetermined direction to accelerate the mixing of water at different temperatures by water flow in different directions to help achieve thermal equilibrium.

In some embodiments, the free end of the water pressure reuse and flow guiding device includes a rotatable guide _/ steering member and _/ or the fan blade device to change the second predetermined portion corresponding to a predetermined operational state Direction, thereby accelerating the mixing of water at different temperatures by creating water flows in different directions to help achieve thermal equilibrium.

In some embodiments, the first predetermined direction and the flow of the influent water in the inlet pipe are large \¥0 2019/097393 ?€1/162018/058886 to the contrary, thereby accelerating the mixing of water at different temperatures by generating water flows in different directions to help achieve thermal equilibrium; and _/ or the direction of movement of the elastic member And _/ or said second predetermined direction is preferably orthogonal to the direction of flow of the incoming water within said inlet pipe to thereby accelerate mixing of water at different temperatures by creating a flow of water in different directions to aid in achieving thermal equilibrium.

In some other embodiments, the water pressure reuse and flow guiding device includes a built-in temperature sensor to cause the water pressure reuse and flow guiding device to be between the energy storage state and the diversion state corresponding to the predetermined water temperature. Conversion.

In some embodiments, the water storage container is configured to have a double sealed wall or shell, including an inner or inner casing containing water and an outer wall or outer casing surrounding the inner or inner casing and a partition therebetween The heat and insulation layer or medium, preferably an air or gas interlayer or vacuum layer, increases the insulation and reduces the heat loss of the water.

In some embodiments, the water storage container includes an exhaust valve operatively coupled to the water pressure reuse and flow guiding device to correspond to an energy storage state of the water pressure reuse and flow guiding device and The diversion state is correspondingly switched, and the exhaust valve preferably extends parallel or substantially parallel to the inlet pipe.

In some embodiments, the water storage container includes an outlet pipe that preferably extends parallel or substantially parallel to the inlet pipe.

In some embodiments, the water storage container includes at least one high-power electric heating tube configured to be fixed or installed at the same end of the water storage container as the water pressure reuse and flow guiding device. The electric heating tube preferably extends parallel or substantially parallel to the water pressure reuse and flow guiding device and occupies substantially the same usage space.

In some embodiments, the water pressure reuse and flow guiding device is in the form of a cartridge and preferably has the same size and configuration as the electric heating tube of the water heater; and is configured to have an open end and a closed end and is disposed or mounted An elastic member of the closed end and a mating fastener, the resilient member including an operatively coupled spring, a cover member and a detachably coupled coupling to the fixed member \¥0 2019/097393 ?€1/162018/058886 body, and configured to switchably switch between the first position and the second position;

In the first position, the elastic member or body engages with the fixing member and abuts the closed end to preserve the resilience of the elastic member itself or the return or storage of the elastic member by water pressure or water flow Elastic or kinetic energy, and configured to be separable from the fixture in response to a predetermined water temperature or operating condition to move to the second position adjacent the open end by the retained resilience or kinetic energy and to be capable of driving during movement And directing the water in front to flow in a second predetermined direction to facilitate mixing of the water and achieve heat balance;

In the second position, the resilient member is configured to be driven by water pressure or water flow to move and engage the fastener until it is fixed or switched to the first position for conversion and storage through the water The driving kinetic energy of the pressure or water flow can then be switched from the first position to the second position by the kinetic energy corresponding to a predetermined water temperature or operating condition; wherein the water flow is continuously driven and directed during the switching so that The water of different temperatures in the water storage container can be quickly mixed to help achieve heat balance.

In some embodiments, the cover member and the body of the elastic member preferably have a butyl-shaped cross section and the body has a plurality of recesses spaced apart in a ring shape to be correspondingly movable with the fixing member The hooks or projections _/ pieces are detachably engaged.

Thus, the present invention has leaked an improved water heater, preferably used as an electric water heater for a dishwasher, which reduces heat loss and utilizes the flow and agitation of water to improve the heat cycle of the water in the tank, achieving heat balance and It can directly reduce the time required for heating and reduce the energy consumption of the electric water heater. Therefore, in the case of, for example, the final rinsing stage of the dishwasher, the device of the present disclosure can be used to save energy, thereby improving the overall energy efficiency of the dishwasher.

DRAWINGS

The technical solution of the present disclosure will be described by way of example with reference to the accompanying drawings, in which \¥0 2019/097393 ?€1/162018/058886 Figure 1 is a schematic view of a prior art industrial dishwasher;

₂ is a schematic view of a prior art electric water heater;

_{3 is} a schematic view of a rinse portion of an exemplary dishwasher of the present disclosure;

_{4 is} a schematic view of an exemplary water heater having a water storage container of the present disclosure;

Figure _{5 is} a schematic view of an exemplary water inlet pipe of the present disclosure;

₆ is a schematic diagram of an exemplary water pressure reuse and flow guiding device of the present disclosure;

Figure _{7 is} a schematic illustration of the operation of an exemplary water pressure reuse and flow directing device of the present disclosure.

Detailed ways

Some preferred embodiments of the present disclosure will be described below in conjunction with the drawings in order to explain the technical solutions in detail.

Referring to Figure ₁₂ , there is shown a schematic view of a prior art industrial dishwasher and its electric water heater, wherein the dishwasher includes two parts for processing the dishes, i.e., the main wash (rinse) and rinse portions. Each part has its own electric water heater for heating water. Figure ₂ shows the original design of an electric water heater, the outer casing of which is made of a single layer of metal. The outer casing is provided with a water inlet interface, a water outlet interface, a drainage interface (for maintenance), an exhaust valve, a temperature sensor interface, etc., and a plurality of sets of high-power electric heating tubes are installed at one end, and the outer layer is insulated with materials. Hot cotton) wrapped to prevent heat loss.

When using the dishwasher, the relevant electric water heater will be placed on the bottom of the dishwasher (as shown in Figure ₃ ) and placed under each wash tray, while the dishwasher is usually placed in the workshop and kitchen. , the environment is humid and the temperature is high. Existing insulation materials (insulation cotton) will cause moisture and damage after prolonged use, affecting the heat insulation effect and causing heat and energy loss. It also raises the temperature of the working environment and affects nearby workers. Therefore, it is desirable to be able to change the existing insulation structure to improve heat loss and improve the working environment of the workshop. \¥0 2019/097393 ?€1/162018/058886 On the other hand, in the current restaurant business, the relevant dishwasher has the opportunity to stop operating for several hours before restarting, reducing operating costs. However, when the dishwasher is turned off, the temperature of the hot water in the water tank will gradually be lost. After the restart, the electric water heater needs to raise the water stored in the water tank to the required temperature. Therefore, after the operation is stopped, the heat loss in the water tank is reduced, and after restarting, the energy consumption of the electric heating pipe can be reduced to heat the water in the water tank. Therefore, improving the insulation structure can effectively improve energy consumption.

Referring to Figure ₃₇ , various schematic views of an exemplary water heater of the present disclosure are shown. The exemplary water heater shown in Figure ₄₅ includes: a generally elongated and _/ or tubular extension into the water storage container and preferably disposed at or adjacent the end of the water storage container or An inlet pipe extending parallel or substantially parallel to an end face of the end, the inlet pipe being configured to extend generally along substantially the entire height of the water storage container and including at least one blade device rotatably disposed or mounted, The fan blade device has a plurality of inner blades and outer blades operatively connected, at least one of the inner blades and _/ or the outer blades of the blades is configured to be disposed obliquely and with water flow in the inlet pipe The flow direction intersects at a predetermined angle to convert and rotate around the shaft by the force of the water flow in the inlet pipe and to flow water in the vicinity of the periphery of the inlet pipe in a first predetermined direction; the first predetermined direction is preferably The height directions are approximately parallel.

The prior art inlet pipe originally only introduces water into the top of the water tank, but the present disclosure converts it into a long pipe, extending from the top water inlet to the bottom of the cylinder, and the total length of the pipe can be preferably divided into three sections, wherein two Connected to the blade device. The associated fan blade assembly includes inner blades that are respectively contained within the pipe, and outer blades that are outside the connected pipe. And use the ₁₁ ^ _· water pressure when entering the water and the water from high to low energy to push the inner fan device of the pipe. The relevant internal fan blade device can drive the outer fan blade to cause static water to flow near the inlet pipe in the cylinder. The water flow can cause the water in the vicinity of the electric heating pipe to flow, so that the heating in the water tank and the water that has not been heated are accelerated and mixed, which is particularly advantageous for the convective circulation operation of the water and the acceleration of the heat balance.

In some embodiments, as shown in FIG. ₄ , further comprising a water pressure reuse and a flow guiding device, including \¥0 2019/097393 ?€1/162018/058886 Active and lockably connected or mounted resilient members and configured to switch between energy storage and diversion using water temperature, water flow, and _/ or water pressure changes Switching between; wherein, in the energy storage state, the water pressure reuse and flow guiding device drives or compresses and locks the elastic member in position by water pressure or water flow to store kinetic energy converted by water pressure or water flow; In the flow guiding state, the water pressure reuse and the flow guiding device release the elastic member, and the spring force of the elastic member or the stored kinetic energy drives the water to flow in the second predetermined direction to make the temperature in the water storage container Different waters can be rapidly mixed to help achieve thermal equilibrium; the second predetermined direction is preferably parallel to the length or width or thickness direction of the water storage container; and _/ or the second predetermined direction is preferably The first predetermined directions are orthogonal such that water flow in different directions is accelerated to accelerate mixing of water at different temperatures to help achieve thermal equilibrium.

In some embodiments, as shown in Figure ₆ , the water pressure reuse and flow guiding device is in the form of a cartridge and preferably has the same size and configuration as the electric heating tube of the water heater; and is configured to have an open end and a closed end And an elastic member and a matching fixing member disposed or mounted at the closed end, the elastic member including an operably coupled spring, a cover member and a coupled body detachably coupled to the fixing member, and The switch is configured to switch between the first position and the second position.

In some embodiments, as shown in FIG. ₇ ,, in the first position, the elastic member or body engages with the fixing member and abuts the closed end to preserve the resilience of the elastic member itself Or a resilient or kinetic energy of the elastic member that is converted and stored by water pressure or water flow, and configured to be separated from the fixing member corresponding to a predetermined water temperature or working state to move to the abutment by the retained resilience or kinetic energy The second position of the open end and the water capable of driving and guiding the front flow during the movement move in a second predetermined direction to facilitate mixing of the water and achieve heat balance.

In the second position, the resilient member is configured to be driven by water pressure or water flow to move and engage the fastener until it is fixed or switched to the first position for conversion and storage through the water The driving kinetic energy of the pressure or water flow can then be switched from the first position to the second position by the kinetic energy corresponding to a predetermined water temperature or operating condition; wherein the switching is continued during the switching \¥0 2019/097393 ?€1/162018/058886 The ground drives and directs the water flow so that the water of different temperatures in the water storage container can be quickly mixed, thereby contributing to the heat balance.

In general, the water pressure reuse and flow guiding device of the present disclosure utilizes a heating temperature and a pressure change in the water tank _/ water storage container, the water pressure will push the relevant component _/ elastic member, and store the relevant energy to the spring _/ elastic member. Inside, the spring _/ elastic member is finally fastened by the bottom _/ end snaps. When appropriate, the exhaust can be released and the snaps released, so that the energy stored in the spring is released, thereby generating a flow of water, causing the water in the tank to flow, so that the tank is warming and not yet added. The warm water is mixed quickly and reaches the heat balance. The direction of the water flow is different from the direction of the inlet pipe, and the water flow in different directions can accelerate the mixing of different temperature waters to achieve heat balance.

In some embodiments, as described above, the water pressure reuse and flow guiding device of the present disclosure is designed to be placed in the position of a high-power electric heating pipe, instead of the existing electric heating pipe or can be installed in an originally reserved additional electric heating pipe. s position. The design of the device is based on a tubular shape with an open structure at the beginning and a closed lid inside and a spring connection at the rear. The other end of the spring is connected to the sealed bottom of the device, and is equipped with a spring clip and temperature sensor control, and can control the switch of the operatively connected exhaust valve.

In some embodiments, springs having different stiffness coefficients can be placed in different capacity water _/ water storage containers. By using springs with different stiffness coefficients, corresponding adjustments and fits can be made to different tank _/ water storage tank capacity, pressure and temperature changes.

When the water pressure reuse and flow guiding device of the present disclosure is placed in the position of the replaceable high power electric heating tube, the beginning of the device can come into contact with the water in the water tank. When the water is heated by the electric heating pipe, the water temperature rises, but when the capacity of the water tank _/ water storage container is constant, the water pressure will increase, and the water pressure will push the closed cover to push inward to the bottom, thereby pressing the spring. This action allows the flow of water into the pipeline to flow, mixing the temperature of the water near the beginning of the unit.

When the closed lid is pushed further to the bottom _/ end of the device, it will be fastened by the clip. The bottom _/ end of the device may preferably be provided with a temperature sensor and can control the exhaust valve and the spring snap \¥0 2019/097393 ?€1/162018/058886 pieces, release or change the water pressure and the energy stored in the spring. At the same time, the water in the pipe is pushed out to generate water flow, and the water in the water tank is quickly mixed to achieve heat balance. The piston action before and after the device can be controlled by the stiffness coefficient of the spring and the related control of the temperature detection and the exhaust valve, so that the piston action can be preferably performed multiple times during the heating process, so that the water in the water tank is faster and Preferably mixed.

In some embodiments, as shown in FIG. _{6, 7 7} ,, the cover member and the body of the elastic member preferably have a cross section of a shape of D and the body has a plurality of notches spaced apart in a ring shape to Corresponding movable hooks or projections _/ pieces of the fastener are detachably engaged.

In some embodiments, the free end of the water pressure reuse and flow guiding device includes a rotatable guide _/ steering member (not shown) and _/ or a fan blade device as shown in FIG. ₅ to correspond to a predetermined The second predetermined direction is changed by the operating state to accelerate the mixing of water at different temperatures by generating water flows in different directions to help achieve thermal equilibrium.

In some embodiments, the first predetermined direction is substantially opposite to the flow direction of the influent water in the inlet pipe, thereby accelerating the mixing of water at different temperatures by generating water flows in different directions to help achieve heat balance; And _/ or the direction of movement of the elastic member and _/ or the second predetermined direction is preferably orthogonal to the flow direction of the incoming water in the inlet pipe, thereby accelerating the mixing of water at different temperatures by generating water flows in different directions, To help achieve thermal balance.

In some other embodiments, the water pressure reuse and flow guiding device includes a built-in temperature sensor to cause the water pressure reuse and flow guiding device to be between the energy storage state and the diversion state corresponding to the predetermined water temperature. Conversion. In some embodiments, the water storage container is configured to have a double sealed wall or shell, including an inner or inner casing containing water and an outer wall or outer casing surrounding the inner or inner casing and a partition therebetween The heat and insulation layer or medium, preferably an air or gas interlayer or vacuum layer, increases the insulation and reduces the heat loss of the water.

Thus, it is possible to eliminate the need for insulating materials such as insulating cotton by the present disclosure. Embodiments of the present disclosure \¥0 2019/097393 ?€1/162018/058886 The double-sealed wall body casing is not only insulated, but also durable, and it can maintain the heat preservation effect, so that the temperature of the hot water in the electric water heater can be maintained for a period of time.

The temperature of the single-layer housing of the prior art water heater using an infrared temperature gun is: ₉₄ degrees in the head, ₉₃ degrees in the middle, and ₉₂ degrees in the tail; and the temperature of the casing after switching to the double-sealed casing of the present disclosure is: The ₃₄ degree middle ₃₃ degrees tail ₃₂ degrees (roughly equivalent to room temperature). In some embodiments, the water storage container includes an exhaust valve operatively coupled to the water pressure reuse and flow guiding device to correspond to an energy storage state of the water pressure reuse and flow guiding device and The diversion state is correspondingly switched, and the exhaust valve preferably extends parallel or substantially parallel to the inlet pipe.

In some embodiments, the water storage container includes at least one high-power electric heating tube configured to be fixed or installed at the same end of the water storage container as the water pressure reuse and flow guiding device. The electric heating tube preferably extends parallel or substantially parallel to the water pressure reuse and flow guiding device and occupies substantially the same usage space. The features of the appended claims (which may be used collectively and where appropriate) may form part of this disclosure and are hereby incorporated by reference.

Although different examples or embodiments have been described herein, it should be understood that they are not intended to limit the scope of the invention. For example, in the exemplary application provided herein, the water heater is powered using electrical energy, but gas or other energy sources may also be used in accordance with the substance of the present disclosure without loss of generality. It will be understood that portions or components of different exemplary embodiments may be combined and _/ or mixed with one another, where appropriate, to form other variations without loss of generality.

Claims

\¥0 2019/097393 ?〇1/162018/058886

1. A water heater, which includes:

Extending generally and _/ or tubularly extending into the water storage container and preferably at or adjacent to an end of the water storage container or extending parallel or substantially parallel to an end surface of the end portion An inlet pipe configured to extend generally along substantially the entire height of the water storage container and including at least one blade device rotatably disposed or mounted, the blade device having a plurality of operatively connected The inner blade and the outer blade, at least one of the inner blade and/or the outer blade has a leaf surface configured to be obliquely disposed and intersect with a flow direction of the water flow in the inlet pipe at a predetermined angle for conversion and passage a force of the water flow in the inlet pipe to pivot and to cause water in the vicinity of the periphery of the inlet pipe to flow in a first predetermined direction; the first predetermined direction is preferably substantially parallel to the height direction;

And _/ or a hydraulic re-use and flow guiding device comprising an elastic member that is movably and lockably connected or mounted and configured to be switchable in an energy storage state and guided by water temperature, water flow, and _/ or water pressure change Transition between flow states; wherein, in the energy storage state, the water pressure reuse and flow guiding device drives or compresses and locks the elastic member in position by water pressure or water flow to store kinetic energy converted from water pressure or water flow In the diversion state, the water pressure reuse and the flow guiding device release the elastic member, and the resilience of the elastic member or the stored kinetic energy drives the water to flow in the second predetermined direction, so that the water storage container is inside The different temperatures of the water are capable of rapid mixing to help achieve thermal equilibrium; the second predetermined direction is preferably parallel to the length or width or thickness direction of the water storage container; and _/ or the second predetermined direction Preferably, it is orthogonal to the first predetermined direction to accelerate the mixing of water at different temperatures by water flow in different directions to help achieve thermal equilibrium.

_{2. The} water heater according to claim _1, _wherein: said guide means and pressure then \¥0 2019/097393 ?€1/162018/058886 The free end includes a rotatable guide _/ steering member and _/ or the fan blade device to change the second predetermined direction corresponding to a predetermined operational state, thereby Water flows in different directions are generated to accelerate the mixing of water at different temperatures to help achieve thermal equilibrium.

_3. The water heater according to claim, wherein said first predetermined direction is substantially opposite to a flow direction of the influent water in said inlet pipe, thereby accelerating mixing of water at different temperatures by generating water flows in different directions, Helping to achieve heat balance; and _/ or the direction of movement of the elastic member and _/ or the second predetermined direction is preferably orthogonal to the flow of incoming water within the inlet pipe, thereby accelerating by generating water flow in different directions Mixing water at different temperatures to help achieve thermal equilibrium.

_{4. The} water heater according to claim _1, _wherein: said pressure means comprises a deflector and then built-in temperature sensor, so as to correspond to a predetermined temperature and then the pressure in the reservoir and the deflector The transition between the energy state and the diversion state.

_5. A water heater as claimed in claim, wherein said storage container is configured to have a double sealing wall or the body housing, the inner wall comprising or containing water surrounding the inner shell and the inner shell or the inner wall of the housing and an outer wall or The insulation and insulation layer or medium between the two is preferably an air or gas interlayer or vacuum layer to increase the insulation effect and reduce the heat loss of the water.

_6. The water heater of claim 1 wherein said water storage vessel includes an exhaust valve operatively coupled to said water pressure reuse and flow directing means for corresponding to said water pressure reuse and guidance The energy storage state and the flow guiding state of the flow device are correspondingly switched, and the exhaust valve preferably extends parallel or substantially parallel to the water inlet pipe.

_7. A water heater according to any of the preceding claims, wherein said water storage container comprises an outlet pipe, said outlet pipe preferably extending parallel or substantially parallel to said inlet pipe.

_8. A water heater as claimed in claim 1 wherein said water storage container comprises at least one high \¥0 2019/097393 ? 1/162018/058886 a power electric heating tube configured to be fixed or mounted at the same end of the water storage container as the water pressure reuse and flow guiding device, The electric heating tube preferably extends parallel or substantially parallel to the water pressure reuse and flow guiding device and occupies substantially the same usage space.

_9. The water heater according to claim 1, wherein: said water pressure reuse and flow guiding means are in the form of a cylinder and preferably have the same size and configuration as the electric heating tube of the water heater; and are configured to have an open end And a closed end; and an elastic member and a matching fixing member disposed or mounted at the closed end, the elastic member including an operatively coupled spring, a cover member, and a body coupled to the fixed member detachably coupled And configured to switchably switch between the first location and the second location;

In the first position, the elastic member or body engages with the fixing member and abuts the closed end to preserve the resilience of the elastic member itself or the return or storage of the elastic member by water pressure or water flow Elastic or kinetic energy and configured to be separable from the fixture in response to a predetermined water temperature or operating condition to move to the second position adjacent the open end by the retained resilience or kinetic energy and to be capable of being driven during movement And directing the water in front to flow in a second predetermined direction to facilitate mixing of the water and achieve heat balance;

_10. The water heater according to claim ₉ , wherein the cover member and the body of the elastic member preferably have a cross section of a shape of D and the body has a plurality of notches spaced apart in a ring shape to The respective movable hook members or projections _/ pieces of the fastener are detachably engaged.