CN107367062A - A kind of refrigerating method and device using Teat pump boiler - Google Patents

Abstract

The invention discloses a refrigeration method and device using a heat pump water heater. The refrigeration method includes: S1, acquiring a first indoor temperature in real time, and comparing the first indoor temperature with a set temperature; S2, a temperature sensor When it is detected that the temperature in the first room is greater than or equal to the set temperature, the cold air path of the heat pump water heater is controlled to communicate with the first room, the controller sets the maximum heating temperature of the heat pump water heater as T1, and the temperature sensor detects that the temperature in the first room is less than When setting the temperature, control the cold air path of the heat pump water heater to communicate with the outside, and the controller sets the maximum heating temperature of the heat pump water heater as T2. Through the above technical solution, the room temperature of the first room can be monitored in real time, and compared with the set temperature set by the user, and the cold air outlet of the heat pump water heater can be adjusted in real time according to the comparison result, and the maximum heating temperature of the heat pump water heater can be adjusted. To ensure the normal operation of the kitchen refrigeration function.

Description

Refrigeration method and device using heat pump water heater

technical field

The invention relates to the technical field of water heaters, in particular to a refrigeration method and device utilizing a heat pump water heater.

Background technique

At present, traditional water heaters (such as electric heating, gas water heaters, solar water heaters, etc.) have no cooling function. If the kitchen needs to add additional cooling functions, it is necessary to add a kitchen air conditioner. Due to the heavy oil fume and humidity in the kitchen, it is a special Environment, ordinary household air conditioners cannot be used in the kitchen at all, or although they can be used, the cost of operation and maintenance is extremely high. The current price of a kitchen-specific air conditioner on the market is about 4,000 yuan, which is relatively high in terms of input costs.

In addition, the heat pump water heater with cold air function is a new type of multifunctional water heater. This water heater absorbs air energy and turns it into heat and transfers it to the water tank to heat the water. While heating the water to meet domestic hot water, The low-temperature air that has absorbed energy is released and transported to the kitchen through pipes. Since the water vapor in the released air is condensed, the humidity is greatly reduced, and the released air accelerates the air flow in the kitchen or bathroom.

Moreover, when the user uses the heat pump water heater to heat water in the bathroom, the maximum heating temperature of the heat pump water heater reaches the peak of the heating temperature of the heat pump water heater. At this time, if the cold air function in the kitchen is activated, the heat pump water heater can no longer absorb the heat in the air , just can't send cold air to the kitchen, the room temperature of the kitchen just can't be lowered, can't complete the function of kitchen refrigeration, it is inconvenient for users to use.

Therefore, how to adjust the maximum heating temperature of the heat pump water heater to ensure the normal operation of the kitchen refrigeration function when the cold air mode is started has become a technical problem to be solved urgently.

In view of this, the present invention is proposed.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a cooling method and device using a heat pump water heater that can adjust the maximum heating temperature of the heat pump water heater according to the room temperature and ensure the normal operation of the kitchen refrigeration function when the cold air mode is activated .

In order to solve the problems of the technologies described above, the present invention adopts the basic idea of technical solution to be:

A first aspect of the present invention proposes a refrigeration method utilizing a heat pump water heater, the refrigeration method comprising:

S1, acquiring a first indoor temperature in real time, and comparing the first indoor temperature with a set temperature;

S2, when the temperature sensor detects that the temperature in the first room is greater than or equal to the set temperature, control the cold air path of the heat pump water heater to communicate with the first room, and the controller sets the maximum heating temperature of the heat pump water heater as T1. - When the indoor temperature is lower than the set temperature, control the cold air path of the heat pump water heater to communicate with the outside, and the controller sets the maximum heating temperature of the heat pump water heater to T2.

Preferably, said T1 is smaller than the peak heating temperature T _max of the heat pump water heater;

The T2 is less than or equal to the peak heating temperature T _max of the heat pump water heater.

Preferably, after the step S2, it also includes:

S3, when the temperature in the first room is greater than or equal to the set temperature, the controller receives a signal to lower the temperature of the first room, the controller adjusts the maximum heating temperature T1 set by the heat pump water heater to the peak heating temperature T _max of the heat pump water heater, and starts the heat pump water heater Provide cool air to the first chamber.

Preferably, the step S2 specifically includes:

When the first indoor temperature is greater than or equal to the set temperature, the first outlet of the wind direction switching device is opened;

When the first indoor temperature is lower than the set temperature, the second outlet of the wind direction switching device is opened.

The second aspect of the present invention proposes a refrigeration device utilizing a heat pump water heater, the refrigeration device comprising:

Heat pump water heater, installed in the second room, heats the water in the heat pump water heater and generates cold wind;

The wind direction switching device is arranged between the first room and the second room, connected with the heat pump water heater, and used to switch the outlet direction of the cold air;

The controller is connected with the wind direction switching device. When the temperature sensor detects that the temperature in the first room is greater than or equal to the set temperature, the controller controls the wind direction switching device to communicate the cold air path of the heat pump water heater with the first room, and at the same time set the maximum temperature of the heat pump water heater. The heating temperature is set to T1; when the temperature sensor detects that the temperature in the first room is lower than the set temperature, the controller controls the wind direction switching device to connect the cold air path of the heat pump water heater to the outside, and at the same time set the maximum heating temperature of the heat pump water heater to T2 .

Preferably, the refrigeration unit also includes:

A display panel, the display panel is installed in the first chamber and connected to the controller.

Preferably, a cold wind start button is set on the display panel, and when it is detected that the cold wind start button is pressed, the maximum heating temperature T1 set by the heat pump water heater is adjusted to the peak heating temperature T _max of the heat pump water heater, and the heat pump is started The water heater provides cold air to the first room through the wind direction switching device.

Preferably, the wind direction switching device includes: a first outlet and a second outlet, the first outlet leads to the first chamber, and the second outlet leads to the outside.

Preferably, the wind direction switching device further includes: a baffle, and the opening and closing of the first outlet and the second outlet are controlled by adjusting the position of the baffle.

Preferably, the wind direction switching device further includes: an adjusting rod, the adjusting rod is arranged on one side of the wind direction switching device, and the opening and closing of the first outlet and the second outlet are manually controlled by swinging the adjusting rod.

After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

Through the above technical solution, the room temperature of the first room can be monitored in real time, and compared with the set temperature set by the user, and the cold air outlet of the heat pump water heater can be adjusted in real time according to the comparison result, and the maximum heating temperature of the heat pump water heater can be adjusted. It can well ensure the normal operation of the kitchen refrigeration function and improve the user experience.

And when the temperature in the first room is greater than or equal to the set temperature, the controller has set the maximum heating temperature of the heat pump water heater as T1. At this time, the user needs to cool the first room. After starting the cooling mode in the first room, the control The heater will automatically change the maximum heating temperature of the heat pump water heater from T1 to T _max , so that even if the water temperature of the heat pump water heater reaches T1 when the user activates the cooling mode, the heat pump water heater can also work to provide cold air for the first room.

When the controller or motor fails, the user can manually control the opening and closing of the first outlet and the second outlet by using the adjusting lever arranged on the wind direction switching device, and then the direction of the cold air discharge, which can avoid the controller or When the motor and the like break down, the refrigerating device utilizing the heat pump water heater cannot work, which further satisfies the user's needs and brings convenience to the user.

Description of drawings

In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the accompanying drawings that need to be used in the specific embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention , for those skilled in the art, other drawings can also be obtained according to these drawings on the premise of not paying creative work.

Fig. 1 shows the flowchart of the refrigeration method utilizing heat pump water heater of an embodiment of the present invention;

Figure 2 shows a schematic structural view of a refrigeration device using a heat pump water heater according to an embodiment of the present invention;

Fig. 3 shows a schematic diagram of a refrigeration device using a heat pump water heater according to another embodiment of the present invention;

Fig. 4 shows a top view of a refrigeration device utilizing a heat pump water heater according to an embodiment of the present invention.

The reference signs of Fig. 2 to Fig. 4 are as follows:

1 wind direction switching device, 11 first outlet, 12 second outlet, 13 adjusting rod;

2 heat pump water heaters.

detailed description

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Embodiment one

As shown in Figure 1, the first aspect of the present invention proposes a refrigeration method utilizing a heat pump water heater, the refrigeration method comprising:

S1, acquiring a first indoor temperature in real time, and comparing the first indoor temperature with a set temperature;

S2, when the temperature sensor detects that the temperature in the first room is greater than or equal to the set temperature, control the cold air path of the heat pump water heater to communicate with the first room, and the controller sets the maximum heating temperature of the heat pump water heater as T1. - When the indoor temperature is lower than the set temperature, control the cold air path of the heat pump water heater to communicate with the outside, and the controller sets the maximum heating temperature of the heat pump water heater to T2.

Preferably, said T1 is smaller than the peak heating temperature T _max of the heat pump water heater;

The T2 is less than or equal to the peak heating temperature T _max of the heat pump water heater.

In the above technical solution, a temperature sensor is installed in the first room, and the system will compare the temperature in the first room detected by the temperature sensor with the set temperature in real time. If the temperature in the first room detected by the temperature sensor is greater than or equal to When setting the temperature, the controller will automatically lead the outlet of the cold air generated by the heat pump water heater to the first room, and at the same time set the maximum heating temperature of the heat pump water heater to T1, so that when the user uses the heat pump water heater to heat water in the bathroom , even if the water temperature of the heat pump water heater reaches the maximum heating temperature T1, since the maximum heating temperature T1 is less than the peak heating temperature T _max of the heat pump water heater, after starting the cooling mode of the first room, the water temperature of the heat pump water heater still has room to rise. When the water heater is working, it can absorb the heat in the air to heat the water, and at the same time deliver cold air to the first chamber, wherein T1 can be set according to the needs of users.

When the temperature sensor detects that the temperature in the first room is lower than the set temperature, the temperature in the first room is lower and no further cooling is needed, so the cold air generated by the heat pump water heater is led to the outside, and the controller sets the maximum heating temperature of the heat pump water heater to Set as T2, and T2 can be set according to the needs of users.

In addition, the value of T1 can be set according to the needs of the user, or the controller can automatically adjust the value of T1 according to the temperature value of the first room detected by the temperature sensor installed in the first room, as follows:

When the first indoor temperature value detected by the temperature sensor is relatively high (for example, the first indoor temperature value ≥ 30°C), the controller will reduce the maximum heating temperature of the heat pump water heater and adjust it to T1a (where T1a<T1), When the first indoor temperature value detected by the temperature sensor is relatively low (for example, the set temperature ≤ the first indoor temperature value ≤ 30°C), the controller will increase the maximum heating temperature of the heat pump water heater to T1b (wherein, T1<T1b<T _max ), so that when the temperature in the first room is high, more cold air is needed, so in order for the heat pump water heater to provide more cold air, it is necessary to reduce the maximum heating temperature of the heat pump water heater, and when the first The higher temperature in the room proves that the temperature in the bathroom is also higher. At this time, the user does not need a high water temperature in the bathroom to meet the needs. On the contrary, when the temperature in the first room is relatively low (that is, the set temperature ≤ the first room Temperature value ≤ 30 ℃), the first room needs less cold air, and the user needs a relatively high water temperature in the bathroom to meet the needs. At this time, the maximum heating temperature of the heat pump water heater is increased to meet the various needs of the user .

Through the above technical solution, the room temperature of the first room can be monitored in real time, and compared with the set temperature set by the user, and the cold air outlet of the heat pump water heater can be adjusted in real time according to the comparison result, and the maximum heating temperature of the heat pump water heater can be adjusted. It can well ensure the normal operation of the kitchen refrigeration function and improve the user experience.

Among them, the user can determine or change the specific value of the set temperature according to his actual needs, which can satisfy the diverse experience of the user.

Preferably, after the step S2, it also includes:

S3, when the temperature in the first room is greater than or equal to the set temperature, the controller receives a signal to lower the temperature of the first room, the controller adjusts the maximum heating temperature T1 set by the heat pump water heater to the peak heating temperature T _max of the heat pump water heater, and starts the heat pump water heater Provide cool air to the first chamber.

In the above technical solution, when the temperature in the first room is greater than or equal to the set temperature, the controller has set the maximum heating temperature of the heat pump water heater as T1. After the cold air mode, the controller will automatically change the maximum heating temperature of the heat pump water heater from T1 to T _max , so that even when the user starts the cold air mode, the water temperature of the heat pump water heater reaches T1, and the heat pump water heater can also work to provide cold air for the first room .

Preferably, the step S2 specifically includes:

When the first indoor temperature is greater than or equal to the set temperature, the first outlet of the wind direction switching device is opened;

When the first indoor temperature is lower than the set temperature, the second outlet of the wind direction switching device is opened.

In the above technical solution, the wind direction switching device is used to switch the cold air outlet of the heat pump water heater, and the cold air generated by the heat pump water heater can be led to the first room or the outside through the wind direction switching device. The wind direction switching device has two air outlets, which are respectively the first outlet and the second outlet, and the first outlet is connected to the first chamber, and the second outlet is connected to the outdoor;

In this way, when it is detected that the first indoor temperature is greater than or equal to the set temperature, in order to ensure the normal operation of the heat pump water heater, the maximum heating temperature of the heat pump water heater is set to T1, and then the wind direction switching device is controlled to open the first outlet. When the user needs cold air in the first room, he can start the cold air mode, so that the heat pump water heater will start and the cold air generated will be led to the first room through the wind direction switching device, and the value of T1 can be changed according to the user's needs.

When the temperature in the first room is lower than the set temperature, that is, when the temperature in the first room is low and no cold air is needed at all, the wind direction switching device will be controlled to open the second outlet, and the maximum heating temperature of the heat pump water heater will be set to T2. In this way, the cold air generated by the heat pump water heater will directly flow to the outside instead of the first chamber, and the value of T2 can be changed according to the needs of users.

Wherein, the first room may be one or more rooms in a kitchen, a bedroom, a living room, and an office.

In this way, while the user can normally use the heat pump water heater, it can also cool the kitchen and other rooms and provide air-conditioning without causing discomfort to the user and improving the user experience.

Preferably, T1≥40°C and T2≥40°C.

In order to ensure the normal operation of the heat pump water heater, the set maximum temperature should be T1≥40°C and T2≥40°C.

Embodiment two

As shown in Figures 2 to 4, a refrigeration device using a heat pump water heater 2 includes:

Heat pump water heater 2, installed in the second room, heats the water in heat pump water heater 2 and generates cold wind;

The wind direction switching device 1 is arranged between the first room and the second room, connected with the heat pump water heater 2, and used to switch the outlet direction of the cold air;

The controller is connected with the wind direction switching device 1. When the temperature sensor detects that the temperature in the first room is greater than or equal to the set temperature, the controller controls the wind direction switching device 1 to communicate the cold air path of the heat pump water heater 2 with the first room, and at the same time turn the heat pump The maximum heating temperature of the water heater 2 is set as T1; when the temperature sensor detects that the temperature in the first room is lower than the set temperature, the controller controls the wind direction switching device 1 to connect the cold air path of the heat pump water heater 2 with the outside, and at the same time switch the air flow of the heat pump water heater 2 to the outside. The highest heating temperature is set as T2.

In the above technical solution, the heat pump water heater 2 is installed in the bathroom (i.e. the second room). When the heat pump water heater 2 starts, it will absorb the energy of the air to heat the water in the heat pump water heater 2, and the cold air after the absorbed energy can be used To cool the kitchen, bedroom, living room, etc., so that while hot water can be used, it can also cool the room and ensure indoor air circulation. Install a temperature sensor in the kitchen (that is, the first room), and the temperature sensor and control The controller is able to compare the room temperature with the set temperature in real time to switch the cold air outlet of the wind direction switching device 1, and the first room and the second room are connected through the wind direction switching device 1,

In addition, when the room temperature in the kitchen is relatively high, the controller will align the air outlet of the air direction switching device 1 with the kitchen, and set the maximum heating temperature of the heat pump water heater 2 as T1; when the room temperature in the kitchen is relatively low, The controller will direct the air outlet of the wind direction switching device 1 to the outside, and automatically set the maximum heating temperature of the heat pump water heater 2, so that even if the user uses the heat pump water heater 2 in the bathroom, the cold air generated will not lead to the kitchen. will lead directly to the outside.

Through the above technical solution, the cold air generated by the heat pump water heater 2 in the bathroom can be directly transmitted to the kitchen, avoiding the trouble of installing a special air conditioner for the kitchen in the kitchen. Refrigerate and provide air-conditioning without causing discomfort to the user, thereby improving the user experience.

Preferably, the refrigeration unit also includes:

A display panel, the display panel is installed in the first chamber and connected to the controller.

Preferably, a cold wind start key is set on the display panel, and when it is detected that the cold wind start key is pressed, the maximum heating temperature T1 set by the heat pump water heater 2 is adjusted to the peak heating temperature T _max of the heat pump water heater 2, and all the heat pump water heaters are started. The above-mentioned heat pump water heater 2 provides cold air to the first room through the wind direction switching device 1 .

In the above technical solution, in order to facilitate the user's use and observation, a display board is installed in the first room, so that the user can directly see the temperature of the first room through the display board, and the user can also directly use the display board to set and Change the set temperature;

And the cold wind start key is set on the display panel, so that when the user wants to cool the first room, he can directly press the cold wind start key, and the heat pump water heater 2 will start, and the first room of the cold air passage will be The first chamber is cooled;

In addition, when the temperature in the first room is greater than or equal to the set temperature, the controller has set the maximum heating temperature of the heat pump water heater 2 as T1. At this time, the user needs to cool the first room. After starting the cooling mode in the first room , the controller will automatically change the maximum heating temperature of the heat pump water heater 2 from T1 to T _max , so that even when the user starts the cold air mode, the water temperature of the heat pump water heater 2 reaches T1, and the heat pump water heater 2 can also work to provide cold air for the first room .

Preferably, the wind direction switching device 1 includes: a first outlet 11 and a second outlet 12, the first outlet 11 leads to the first chamber, and the second outlet 12 leads to the outside.

In the above technical solution, two air outlets are provided on the wind direction switching device 1, namely the first outlet 11 and the second outlet 12, and the first outlet 11 communicates with the first chamber, so that the first outlet 11 can be used to The cold air generated by the heat pump water heater 2 leads to the first chamber, and the second air outlet communicates with the outside, so that the cold air generated by the heat pump water heater 2 can be passed to the outside through the second outlet 12 .

Preferably, the wind direction switching device 1 further includes: a baffle, and the opening and closing of the first outlet 11 and the second outlet 12 are controlled by adjusting the position of the baffle.

In the above technical solution, a baffle is provided on the wind direction switching device 1. When the baffle blocks the first outlet 11, the first outlet 11 is closed and the second outlet 12 is opened. When the baffle blocks the second outlet 12, The second outlet 12 is closed and the first outlet 11 is opened, so that the opening and closing of the first outlet 11 and the second outlet 12 can be adjusted by the position of the baffle.

Preferably, the wind direction switching device 1 further includes: a motor, and the controller uses the motor to control the position of the baffle.

In the above technical solution, a motor is provided on the wind direction switching device 1, and the motor is connected to the baffle, and the movement of the motor is controlled by the controller to drive the movement of the baffle so that the first outlet 11 and the second outlet 12 can be automatically opened and closed. closure.

Preferably, the wind direction switching device 1 further includes: an adjusting rod 13, which is arranged on one side of the wind direction switching device 1, and the first outlet 11 and the second outlet 12 are manually controlled by the fluctuation adjusting rod 13 on and off.

In the above technical solution, when the controller or the motor fails, the user can manually control the opening and closing of the first outlet 11 and the second outlet 12 by using the adjustment lever 13 provided on the wind direction switching device 1, so that the cooling air flow The discharge direction can avoid the situation that the refrigeration device of the heat pump water heater 2 cannot work when the controller or the motor fails, which further meets the needs of the user and brings convenience to the user.

Embodiment Three

When the temperature in the kitchen measured by the temperature sensor is relatively high, the controller will automatically set the maximum heating temperature of the heat pump water heater to 50°C and display it on the display board to ensure that the system can be ready at any time when the kitchen needs cold air. Heating and generating cold air to supply the kitchen.

At this time, if the user needs cold air in the kitchen, press the "cold air start" button on the display panel to start the heat pump water heater, and the cold air will be automatically introduced into the kitchen through the wind direction switching device, thereby realizing functions such as cooling and dehumidification.

When the temperature in the kitchen is relatively low measured by the temperature sensor, the controller automatically sets the maximum heating temperature of the heat pump water heater to 75°C and displays it on the display panel, and automatically introduces the cold air to the outside through the wind direction switching device, which will not affect the user experience.

The implementations in the above examples can be further combined or replaced, and the examples are only descriptions of preferred embodiments of the present invention, and are not intended to limit the concept and scope of the present invention. Various changes and improvements to the technical solutions of the present invention made by those skilled in the art belong to the protection scope of the present invention.

Claims (10)

1. a kind of refrigerating method using Teat pump boiler, it is characterised in that described refrigerating method includes：

S1, the first indoor temperature is obtained in real time, and by first indoor temperature compared with design temperature；

S2, when temperature sensor detects that the first indoor temperature is more than or equal to design temperature, control heat-pump hot-water The cold wind wind path of device is communicated with the first Room, and the maximum heating temperature of Teat pump boiler is set as T1 by controller, When temperature sensor detects that the first indoor temperature is less than design temperature, control the cold wind wind path of Teat pump boiler with Outdoor is communicated, and the maximum heating temperature of Teat pump boiler is set as T2 by controller.

2. the refrigerating method according to claim 1 using Teat pump boiler, it is characterised in that described T1 is less than the heating-up temperature peak value T of Teat pump boiler_max；

The T2 is less than or equal to the heating-up temperature peak value T of Teat pump boiler_max。

3. the refrigerating method according to claim 2 using Teat pump boiler, it is characterised in that in institute State step S2 also includes afterwards：

S3, when the first indoor temperature is more than or equal to design temperature, receive the signal to the cooling of the first Room, control The maximum heating temperature T1 that Teat pump boiler is set is adjusted to the heating-up temperature peak value of Teat pump boiler by device processed T_max, start Teat pump boiler and provide cold wind for the first Room.

4. the refrigerating method according to claim 2 using Teat pump boiler, it is characterised in that described Step S2 is specifically included：

When the first indoor temperature is more than or equal to design temperature, the first outlet of wind direction switching device is opened；

When the first indoor temperature is less than design temperature, the second outlet of wind direction switching device is opened.

5. a kind of refrigerating plant using Teat pump boiler, it is characterised in that described refrigerating plant includes：

Teat pump boiler, in second Room, the water in Teat pump boiler is heated and produces cold wind；

Wind direction switching device, between setting between the first chamber and the second chamber, it is connected with Teat pump boiler, for switching The export direction of cold wind；

Controller, it is connected with wind direction switching device, temperature sensor detects that the first indoor temperature is more than or equal to During design temperature, controller control wind direction switching device communicates the cold wind wind path of Teat pump boiler with the first Room, The maximum heating temperature of Teat pump boiler is set as T1 simultaneously；Temperature sensor detects the first indoor temperature During less than design temperature, controller control wind direction switching device communicates the cold wind wind path of Teat pump boiler with outdoor, The maximum heating temperature of Teat pump boiler is set as T2 simultaneously.

6. the refrigerating plant according to claim 5 using Teat pump boiler, it is characterised in that described Refrigerating plant also include：

Display board, the display board are arranged on the first interior, are connected with the controller.

7. the refrigerating plant according to claim 6 using Teat pump boiler, it is characterised in that in institute Setting cold wind start key on display board is stated, when detecting that cold wind start key is pressed, and Teat pump boiler is set Fixed maximum heating temperature T1 is adjusted to the heating-up temperature peak value T of Teat pump boiler_max, start the heat-pump hot-water Device simultaneously provides cold wind by wind direction switching device for the first Room.

8. the refrigerating plant according to claim 5 using Teat pump boiler, it is characterised in that described Wind direction switching device includes：First outlet and second outlet, the first outlet lead to the first Room, and described second Outdoor is led in outlet.

9. the refrigerating plant according to claim 8 using Teat pump boiler, it is characterised in that described Wind direction switching device also includes：Baffle plate, first outlet and second is controlled to go out by adjusting the position of the baffle plate The opening and closing of mouth.

10. the refrigerating plant using Teat pump boiler according to claim 8 or claim 9, it is characterised in that The wind direction switching device also includes：Adjusting rod, the adjusting rod are arranged on the side of the wind direction switching device, The opening and closing of first outlet and second outlet are controlled manually by fluctuating adjusting rod.