WO2017167851A1

WO2017167851A1 - Heater device

Info

Publication number: WO2017167851A1
Application number: PCT/EP2017/057492
Authority: WO
Inventors: David Carvalho GUILHERME; Ricardo Jorge de Sousa Vieira
Original assignee: Bosch Termotecnologia S.A.
Priority date: 2016-04-01
Filing date: 2017-03-30
Publication date: 2017-10-05
Also published as: DE112017001663A5; PT109285A

Abstract

The invention relates to a heater device, in particular a tankless water heater, which is provided for heating water (10a; 10b) as needed by means of at least one flame (12a; 12b), comprising at least one ignition unit (14a; 14b) which is provided for igniting the flame (12a; 12b) as needed at least by means of an ignition movement, at least one differential pressure unit (16a) which generates at least one movement in at least one operating state on the basis of at least one pressure of the water (10a; 10b), and a trigger unit (18a; 18b) which is provided for mechanically triggering the ignition movement by means of the movement.

Description

Description heater device

State of the art

Continuous flow heaters with gas burners are known from the prior art, which heat through water by means of a flame, wherein the flame can be ignited by a piezoelectric igniter, if necessary.

Disclosure of the invention

There is proposed a heater device, in particular a continuous flow heater device, which is provided for a need-based heating of water by means of at least one flame, with at least one ignition unit, the need to ignite the flame at least by means of an ignition movement, in particular an element, preferably an element of the heater device is provided with at least one differential pressure unit which generates at least one movement in at least one operating state as a function of at least one pressure of the water, in particular a flow pressure and / or a dynamic pressure of the water, and with a triggering unit which advantageously has the element, which is intended to trigger the firing motion mechanically by means of the movement and in particular to release.

A "heater device" is to be understood as meaning, in particular, a component, in particular a functional component, in particular a design and / or functional component of a heater, in particular a continuous flow heater. special activated as needed, heating unit on. In this context, a "heating unit" is to be understood as meaning in particular a unit which is intended to convert energy, in particular bioenergy and / or preferably fossil energy, for example chemical binding energy of a particularly fossil fuel, in particular directly, into heat and in particular a fluid. In particular, the heating unit comprises at least one heating module and advantageously at least one heat exchanger The heating module is designed in particular as a burner, for example as an oil burner and preferably as a gas burner and advantageously has a thermal connection with the heater for heating the fluid

Heat exchanger on. In particular, the heat exchanger comprises at least one supply line for a fluid, in particular unheated and / or to be heated, and in particular at least one outlet for a fluid heated in particular by means of the heating module.

In particular, there is a need for igniting the flame upon a request for heated water, particularly by a user. Advantageously, the ignition unit ignites the flame in the operating state by igniting the, in particular flowing, fuel. The ignition movement preferably causes at least one ignition spark, which ignites the fuel in the operating state. Particularly preferably, the element of the heater device carries out the ignition movement.

Advantageously, the differential pressure unit has at least one pressure vessel with at least one membrane. Particularly advantageous divides the membrane

Pressure vessel in a first area and a second area. Preferably, incoming or outgoing water flows through the at least one inlet into the first area when a water request is made. Particularly preferably, incoming or outgoing water flows through at least one outlet with a tapering cross-section from the first when there is a demand for water

Area off. Advantageously, a flow pressure and / or a back pressure of the incoming or outgoing water in the operating state causes a deformation of the membrane. In particular, the membrane is deformed in a jammed condition of the incoming or outgoing water in the direction of the second region. Furthermore, the membrane is in particular in a flowing Condition of the incoming or outgoing water at least closer to a zero position of the membrane as in the case of the dammed state. Particularly advantageous is attached to the membrane at least one pin element which moves in a deformation of the membrane relative to a zero position of the membrane and in particular carries out the movement. It is also conceivable that the differential pressure unit has at least one piston instead of the diaphragm.

Preferably, the trip unit is intended to generate the ignition movement by means of the movement. Particularly preferably, the trip unit is provided to at least release a generation of the ignition movement by means of the movement.

The embodiment according to the invention makes it possible to provide a generic heater device with improved operating characteristics. Furthermore, a variety of parts can be advantageously reduced. Furthermore, advantageously, a heater device can be provided with an advantageous structural design. Advantageously, a simplicity and / or a high reliability with regard to an on-demand ignition of a flame can be achieved. Further, advantageously, ignition of a flame can be mechanically coupled to a water request.

In a preferred embodiment of the invention, it is proposed that the ignition unit has at least one piezoelectric element which generates at least one ignition spark in the operating state in response to the ignition movement. Advantageously, the piezoelectric element is deformed sufficiently strong in the operating state by the ignition movement to generate the spark. As a result, a spark can advantageously be generated by means of a mechanical movement. In a particularly preferred embodiment of the invention, it is proposed that the triggering unit is intended to generate the ignition movement when a limit value flow of the water is exceeded. In particular, the trip unit is intended to generate the firing motion in response to an amplitude of the movement. Preferably, the limit value flow is adjustable by a user. Advantageously, the borderline Value flow at least 0.1%, more preferably at least 0.5% and preferably at least 1% of a maximum water flow. As a result, an ignition due to a fault flow such as a dripping and / or not completely turned off faucet can advantageously be avoided. Furthermore, this advantageously allows energy-saving operation.

In an advantageous embodiment of the invention, it is proposed that the release unit has at least one spring element which at least partially generates the firing movement in the operating state. Advantageously, the spring element is provided for a document with a bias, which is at least partially relaxed by means of the movement. Particularly advantageous is the ignition movement an accelerated movement. Preferably, the spring element accelerates the element.

In a particularly advantageous embodiment of the invention, it is proposed that the triggering unit has at least one mass element which, in the operating state, carries out the ignition movement in response to the movement. Preferably, the element is formed as the mass element. Advantageously, the mass element is formed from a metal. It is conceivable that that

Mass element is integrally connected to the spring element. By "in one piece" is meant, in particular, at least materially bonded, for example, by a welding process, an adhesion process, an injection process, and / or another process that appears appropriate to one skilled in the art, and / or advantageously molded in one piece, It is also conceivable for the spring element to comprise the mass element, In particular, the mass element may be formed as an area of the spring element. This can advantageously a reliable

Igniting the pilot can be enabled.

It is also proposed that the firing movement, in particular of the element, advantageously of the mass element is an accelerated movement in the direction of the piezoelement. Advantageously, the element is in the operating state accelerated by the spring element. Particularly advantageously, the element abuts against the piezoelectric element during the movement, with the piezoelectric element in particular being deformed. Advantageously, the mass element and the piezoelectric element are stored without contact relative to one another before the ignition movement is carried out. But it is also conceivable that the mass element touches the piezoelectric element in each operating state. In this case, the ignition movement advantageously takes place over a distance which corresponds to a deformation of the piezoelectric element in the direction of the ignition movement. As a result, a high degree of safety with regard to reliable ignition can advantageously be achieved.

Furthermore, it is proposed that the heater device has at least one securing unit which releases and / or prevents ignition of the flame as a function of a water requirement by a user. Advantageously, the securing unit is provided to release, in particular mechanically, and / or to block a triggering of the ignition movement, in particular of the element, advantageously of the mass element as a function of a water requirement by a user. Preferably, the securing unit is coupled to a water extraction valve, for example to a faucet. Particularly preferably, the safety unit releases a triggering of the ignition when the user requests water. Further, the fuse unit advantageously blocks triggering of the firing if the user does not request water. As a result, a high level of operational reliability can advantageously be achieved. Furthermore, this advantageously an unwanted ignition can be avoided, which in particular energy-saving operation can be made possible.

Preferably, the differential pressure unit is provided for controlling an on-demand supply of fuel. Advantageously, the differential pressure unit has a differential pressure switch. The differential pressure unit preferably blocks the inflow of fuel in at least one jammed condition of the incoming and / or outgoing water. Particularly preferably, the differential pressure unit releases the inflow of fuel in at least one flowing state of the incoming and / or outgoing water. In particular, in the flowing state, a flow rate of the fuel is dependent on a flow rate of the incoming and / or outgoing water. hereby can advantageously be achieved a high component efficiency. Furthermore, this advantageously allows a small number of parts and / or a simple and / or cost-effective production.

Improved operating characteristics can be achieved with a heater, in particular with a water heater with at least one heater device according to the invention.

Furthermore, a method for hot water preparation with a heater device, in particular a continuous flow heater, which is provided for a need-based heating of water by means of at least one flame proposed, where necessary, the flame at least by means of an ignition movement, in particular an element, preferably an element of the heater device, advantageous the mass element is ignited and at least one movement is generated in at least one operating state as a function of at least one pressure of the water, wherein the ignition movement is triggered mechanically by means of the movement.

By a method according to the invention, in particular improved operating properties of a heater device can be achieved. Furthermore, a variety of parts can be advantageously reduced. Furthermore, advantageously, a heater device can be provided with an advantageous structural design. Advantageously, a simplicity and / or a high reliability with regard to an on-demand ignition of a flame can be achieved. Further, advantageously, ignition of a flame can be mechanically coupled to a water request.

The heater device according to the invention should not be limited to the application and embodiment described above. In particular, in order to fulfill a mode of operation described herein, the heater device according to the invention may have a number deviating from a number of individual elements, components and units specified herein. drawing

Further advantages emerge from the following description of the drawing. In the drawing, two embodiments of the invention are shown. The drawings, description, and claims contain numerous features

Combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Show it:

Fig. 1 shows a first heater with a heater device in a schematic representation and

Fig. 2 shows another heater with a further heater device in a schematic representation.

Description of the embodiments

FIG. 1 shows a heater 30a in the form of a through-flow heater with a heater device 32a in a schematic representation. The heater device 32a is provided for needily heating water 10a by means of at least one flame 12a. The heater device 32a has a heating module 34a provided for generating the flame 12a by combustion of a fuel. In the present case, the heating module 34a is designed as a gas burner, which burns a gas as needed. Furthermore, the heater device 32a has a heat exchanger 36a. When a user requests water, the water 10a flows through the heat exchanger 36a and is heated by heat of the flame 12a as needed. The heater device 32a has a differential pressure unit 16a. In the present case, the differential pressure unit 16a on a differential pressure switch 38a, which is provided in a basically known manner for on-demand regulation of a fuel supply. The differential pressure unit 16a has a pressure vessel 40a with a membrane 42a. Depending on a back pressure and / or a flow pressure of the water 10a is the membrane 42a deflected relative to a zero position 44a. The water 10a enters the pressure vessel 40a of the differential pressure unit 16a through an inlet 46a. When a water request, the water 10a exits from the pressure vessel 40a. If no water request takes place, the water 10a has a higher dynamic pressure than in a case in which a water request takes place. In a jammed condition of the water 10a, the diaphragm 42a is further deflected relative to the neutral position 44a than in a flowing state of the water 10a, for example, during a user's water request. At least when changing a flow pressure and / or a back pressure of the water 10a, the differential pressure unit 16a generates at least one movement. In the present case, the movement corresponds to a deformation of the diaphragm 42a along a direction 56a perpendicular to the zero position 44a.

The heater device 32a has an ignition unit 14a, which is provided for a necessary ignition of the flame 12a by means of at least one ignition movement. The ignition unit 14a has at least one piezoelectric element 20a, which generates at least one ignition spark in at least one operating state in response to the ignition movement. The spark is transmitted from the piezoelectric element 20a to the heating module 34a via an electrical connection 48a. The spark ignites the fuel in the operating state. The

Ignition unit has a spring element 22a, which generates the ignition movement in the operating state at least partially. In the present case, the spring element 22a is designed as a compression spring. The spring element 22a can be assigned a bias voltage. In a jammed condition of the water 10a, the spring element 22a is biased. In the operating state, the spring element 22a is relaxed and expands in a direction 26a toward the piezoelectric element 20a. In the present case, the direction 26a is parallel to the direction 56a. However, it is also conceivable that the direction 26a extends at a different angle from the direction 0 to the direction 56a, for example at a right angle. The ignition unit 14a has a mass element 24a, which carries out the ignition movement in the operating state. The mass element 24a is connected to the spring element 22a. The ignition movement is an accelerated movement in the direction 26a toward the piezoelectric element 20a. In the operating state, the mass element 24a is accelerated in the direction 26a on the piezo element 20a and abuts against it. The mass element 24a is moved by the spring element 22a. The mass element 24a is accelerated by a relaxation of the spring element 22a, in particular in the direction 26a. The piezoelectric element 20a is deformed by a shock of the mass element 24a. Deformation of the piezoelectric element 20a generates the ignition spark.

The heater device 32a has a trip unit 18a, which is provided to initiate the ignition movement mechanically by means of the movement. The trip unit 18a has a pin member 50a connected to the diaphragm 42a of the differential pressure unit 16a. The pin element 50a deflects a lever element 52a, which is rotatably mounted about a rotation axis 54a. In the jammed condition of the water 10a, the lever member 52a blocks movement of the mass member 24a along the direction 56a toward the piezoelectric element 20a. If the pin element 50a executes the movement along the direction 56a, a deflection of the lever element 52a is changed. In the flowing state of the water 10 a, the lever member 52 a flips aside and releases the firing motion of the mass member 24 a. It is also conceivable that the firing movement is perpendicular to the movement. The firing movement can then be blocked and / or released, for example, directly by a pin element. Thus, it is conceivable that a mass element is pressed laterally against the pin element and a lateral firing movement of the mass element is released after a movement of the pin member in a direction perpendicular to the firing movement. The trip unit 18a is intended to generate the movement when a limit flow of the water 10a is exceeded. If a flow pressure and / or a back pressure of the water 10a in the pressure vessel 40a of the differential pressure unit 16a changes due to the limit flow falling below a tolerance range, the lever element 52a is deflected within an angular range within which the lever element 52a blocks the firing movement of the mass element 24a , If a flow pressure and / or a back pressure of the water 10a in the pressure vessel 40a of the differential pressure unit 16a changes by more than a tolerance value as a result of exceeding the limit flow, a deflection of the flow rate Lever element 52a by at least one critical angle, from which the lever member 52a, the firing movement of the mass member 24a releases.

The heater device 32a has a securing unit 28a, which releases and / or blocks triggering of the firing movement in response to a water request by a user. The securing unit 28a has a blocking element 56a which, in a state in which there is no water request by a user, blocks the firing movement of the mass element 24a. If a water request is made by a user, the blocking element 56a is rotated about a rotation axis 58a and the firing movement of the mass element 24a is released. The mass element 24a performs the firing movement only when it is released from the trip unit 18a and the fuse unit 28a. In the present case, a rotation of the blocking element 56a is mechanically coupled to an opening and / or closing of a valve (not shown) by means of which a user releases a flow of the water 10a when a water request is made.

FIG. 2 shows a further exemplary embodiment of the invention. The following descriptions and the drawings are essentially limited to the differences between the exemplary embodiments, reference being made in principle to the drawings and / or the description of the exemplary embodiment of FIG. 1 with respect to identically named components, in particular with regard to components having the same reference numbers can be. In order to distinguish the exemplary embodiments, the letter a is followed by the reference symbols of the exemplary embodiment in FIGS. In the embodiment of Figure 2, the letter a is replaced by the letter b.

FIG. 2 shows another heating device 30b designed as a continuous flow heater with a further heater device 32b. The further heater device 32b has an ignition unit 14b with a piezoelectric element 20b. The others

Heater device 32b has a trip unit 18b. The tripping unit 18b has a mass element 24b, which is pressed against the piezo element 20b along a direction 26b by means of a spring element 22b. The spring element 22b is formed as a metal clip. The tripping unit 18b has a further spring element 60b which is connected to the mass element 24b. is bound. The further spring element 60b is designed as a tension spring. The further spring element is connected to a lever element 52b, which is rotatably mounted about a rotation axis 54b. The lever member 52b is deflected by a pin member 50b of the trip unit 18b in response to a flow pressure and / or a back pressure of water 10b, similar to the embodiment of Figure 1. In a jammed condition of the water 10b, the pin member 50b directs the lever member 52b in parallel to the direction 26b, whereby the further spring element 60b is stretched. An extension of the further spring element 60b causes a further spring force, which counteracts a spring force of the spring element 22b. A resultant total force on the piezo element 20b is smaller than the spring force of the spring element 22b. In a flowing state of the water 10b, the expansion of the further spring element 60b is reduced and a total force on the piezoelectric element 20b is correspondingly increased. In at least one flowing state of the water 10b, the resultant total force on the piezoelectric element 20b is sufficiently large to cause deformation of the piezoelectric element 20b sufficient to generate a spark by the piezoelectric element 20b.

The further heater device 32b further comprises a fuse unit 28b, which releases and / or prevents ignition of a flame 12b in response to a water request by a user. The fuse unit 28b has a switch 62b which establishes or interrupts an electrical connection 48b from the piezoelectric element 20b to a heating module 34b of the further heater device 32b in response to a water request by a user. When a water request, the switch 62b is closed and made an electrical contact. A spark is directed into the heating module 34b and ignites a fuel. In the event that there is no water request by a user, the switch 62b interrupts the electrical connection 48b.

Claims

claims

A heating device, in particular a through-flow heater, which is provided for heating water (10a, 10b) by means of at least one flame (12a, 12b) as required, comprising at least one ignition unit (14a, 14b) which can be used to ignite the flame as required (12a 12b) is provided at least by means of an ignition movement, with at least one differential pressure unit (16a) which generates at least one movement in at least one operating state as a function of at least one pressure of the water (10a, 10b), and with a triggering unit (18a, 18b). , which is intended to trigger the firing motion mechanically by means of the movement.

2. Heater device according to claim 1, characterized in that the ignition unit (14a, 14b) has at least one piezoelectric element (20a, 20b) which generates at least one ignition spark in the operating state in response to the ignition movement.

3. Heater device according to one of the preceding claims,

characterized in that the triggering unit (18a, 18b) is provided to generate the firing movement when a limit flow of the water (10a) is exceeded.

4. Heater device according to one of the preceding claims,

characterized in that the tripping unit (18a, 18b) has at least one spring element (22a, 22b) which at least partially generates the firing movement in the operating state. Heater device according to one of the preceding claims, characterized in that the tripping unit (18a; 18b) has at least one mass element (24a; 24b) which, in the operating state, carries out the firing movement in response to the movement.

Heater device according to one of the preceding claims, characterized in that the firing movement is an accelerated movement in the direction (26a; 26b) of the piezoelectric element (20a; 20b).

A heater apparatus according to any one of the preceding claims, characterized by at least one fuse unit (28a; 28b) which releases and / or prevents ignition of the flame in response to a water request by a user.

Heater device according to one of the preceding claims, characterized in that the differential pressure unit (16a) is provided for a regulation of an on-demand supply of fuel.

Heater (30a; 30b), in particular instantaneous water heater, with at least one heater device according to one of the preceding claims.

A method for producing hot water with a heater device, in particular a continuous flow heater device, which is provided for heating water (10a, 10b) as required by means of at least one flame (12a, 12b), in particular according to one of claims 1 to 8, wherein if necessary the flame (12a 12b) is ignited at least by means of an ignition movement and at least one movement is generated in at least one operating state as a function of at least one pressure of the water (10a, 10b), the ignition movement being triggered mechanically by means of the movement.